CN118494287A - Power battery charging method, device, medium and vehicle - Google Patents

Power battery charging method, device, medium and vehicle Download PDF

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Publication number
CN118494287A
CN118494287A CN202310141813.1A CN202310141813A CN118494287A CN 118494287 A CN118494287 A CN 118494287A CN 202310141813 A CN202310141813 A CN 202310141813A CN 118494287 A CN118494287 A CN 118494287A
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China
Prior art keywords
power
state
charge
power battery
vehicle
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CN202310141813.1A
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Chinese (zh)
Inventor
罗海灵
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Beijing CHJ Automobile Technology Co Ltd
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Beijing CHJ Automobile Technology Co Ltd
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Priority to CN202310141813.1A priority Critical patent/CN118494287A/en
Priority to PCT/CN2024/076951 priority patent/WO2024169929A1/en
Publication of CN118494287A publication Critical patent/CN118494287A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Automation & Control Theory (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present disclosure relates to a power battery charging method, apparatus, medium and vehicle. The power battery charging method comprises the following steps: acquiring the power of a vehicle-mounted charger, the power of a vehicle-mounted accessory, the heating power of a power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery when the vehicle is charged; determining a heating time required for the power battery to heat from the current temperature to the target temperature based on the heating power; determining a first state of charge of the power battery based on a difference between a state of charge of the power battery at a full state of charge and an increase in the state of charge of the power battery during a heating time; in response to the state of charge of the power battery reaching the first state of charge, the power battery is heated based on the heating power and the power battery is charged based on the remaining available power. According to the technical scheme, the power battery can be guaranteed to be charged to a full-power state in a low-temperature environment, the low Wen Xuhang capacity of the electric automobile is improved, and meanwhile the heating energy consumption of the battery is reduced.

Description

Power battery charging method, device, medium and vehicle
Technical Field
The disclosure relates to the technical field of batteries, and in particular relates to a power battery charging method, a device, a medium and a vehicle.
Background
Currently, a lithium battery is generally used as a power battery of an electric automobile. However, at low temperature, since lithium batteries have low electrochemical activity and high lithium precipitation risk, only a low charging rate can be used for charging, resulting in a low charging rate of the electric vehicle at low temperature. Moreover, because of the large internal resistance of the battery polarization at low temperature, even if the battery is charged at a small multiplying power, enough electric quantity cannot be charged, so that the power battery cannot reach a full charge state at low temperature. In this way, the battery management system needs to heat the battery in the low-temperature charging process, so that the temperature of the battery is raised as quickly as possible, the battery can bear larger charging current, and a higher upper limit of electric quantity can be achieved.
However, in the case of ac slow charging, since the power of the vehicle-mounted charger is small, it is necessary to provide both the battery charging power and the heating power, and the optimal selection of the two powers is particularly important. In the existing battery charging strategy, when the battery management system recognizes that the battery charging power is greater than the vehicle-mounted charger power, the heating is stopped, the vehicle-mounted charger power completely charges the battery, and the battery charging rate is ensured. However, the battery charging strategy may result in a low battery temperature at the end of charging, and the battery may not reach a full state, severely affecting the low Wen Xuhang capabilities of the electric vehicle. Moreover, as the electric quantity of the power battery is increased year by year, the scene that the battery charging power is greater than the power of the vehicle-mounted charger is also greatly increased, so that the battery charging strategy under the alternating-current slow charging scene is particularly important to optimize.
Disclosure of Invention
In order to solve the technical problems, the present disclosure provides a method, a device, a medium and a vehicle for charging a power battery, so as to ensure that the power battery can be charged to a full-charge state in a low-temperature environment, improve the low Wen Xuhang capacity of an electric automobile, and reduce the heating energy consumption of the battery.
The present disclosure provides a power battery charging method, comprising:
Acquiring power of a vehicle-mounted charger, power of a vehicle-mounted accessory, heating power of a power battery provided by the vehicle-mounted charger, and current temperature and target temperature of the power battery, wherein the power of the vehicle-mounted accessory is provided by the vehicle-mounted charger for running vehicle-mounted accessory, and the target temperature is the temperature at which the power battery can be charged to a full-power state;
determining a heating time required for the power battery to heat from the current temperature to the target temperature based on the heating power;
Determining a first state of charge of the power battery based on a difference between a state of charge of the power battery in a full state of charge and a state of charge increase of the power battery in the heating time, wherein the state of charge increase is obtained by multiplying a remaining available power of a vehicle-mounted charger by the heating time and dividing the multiplied power by a rated power of the power battery, and the remaining available power is obtained by subtracting the vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power;
in response to the state of charge of the power battery reaching the first state of charge, heating the power battery based on the heating power, and charging the power battery based on the remaining available power.
In some embodiments, obtaining the target temperature comprises:
acquiring the battery cell type of the power battery;
And inquiring the temperature of the battery cell corresponding to the battery cell category and the current temperature in the charging test results of the battery cells of different categories at different temperatures to obtain the target temperature.
In some embodiments, the target temperature is a lowest temperature at which the power cell can be charged to a full state.
In some embodiments, determining a heating time required for the power cell to heat from the current temperature to the target temperature based on the heating power comprises:
acquiring the temperature rise rate of an electric core of the power battery under the heating power;
and obtaining the heating time based on the ratio of the difference value of the target temperature and the current temperature to the temperature rise rate of the battery cell.
In some embodiments, before heating the power battery based on the heating power and charging the power battery based on the remaining available power in response to the state of charge of the power battery reaching the first state of charge, the method further comprises:
Obtaining a second state of charge based on a difference between the first state of charge and a preset state of charge redundancy, wherein the preset state of charge redundancy is used for eliminating the influence of the temperature rise error of the power battery;
and taking the second charge state as a first charge state.
In some embodiments, the method further comprises:
and charging the power battery based on the vehicle-mounted charger power before the state of charge of the power battery reaches the first state of charge.
In some embodiments, before obtaining the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery, the method further comprises:
acquiring the external environment temperature;
And if the external environment temperature is determined to be lower than the low-temperature charging temperature threshold value of the battery, acquiring the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery when the vehicle is charged.
The present disclosure provides a power battery charging device, comprising:
The system comprises a parameter acquisition module, a power control module and a power control module, wherein the parameter acquisition module is used for acquiring power of a vehicle-mounted charger, power of a vehicle-mounted accessory, heating power of a power battery provided by the vehicle-mounted charger, current temperature and target temperature of the power battery, wherein the power of the vehicle-mounted accessory is provided by the vehicle-mounted charger for a running vehicle-mounted accessory, and the target temperature is the temperature at which the power battery can be charged to a full-charge state;
a heating time determination module for determining a heating time required for the power battery to heat from the current temperature to the target temperature based on the heating power;
The first state of charge determining module is used for determining the first state of charge of the power battery based on a difference value between the state of charge of the power battery in a full state and the state of charge increment of the power battery in the heating time, wherein the state of charge increment is obtained by multiplying the remaining available power of the vehicle-mounted charger by the heating time and dividing the power by the rated power of the power battery, and the remaining available power is obtained by subtracting the vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power;
And the heating and charging module is used for heating the power battery based on the heating power and charging the power battery based on the residual available power in response to the state of charge of the power battery reaching the first state of charge.
The present disclosure also provides a computer-readable storage medium storing a program or instructions that cause a computer to perform the steps of any one of the methods described above.
The present disclosure also provides a vehicle including:
One or more processors;
a memory for storing one or more programs or instructions;
The processor is configured to perform the steps of any of the methods described above by calling a program or instructions stored in the memory.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
According to the technical scheme provided by the embodiment of the disclosure, the heating time required by heating the power battery from the current temperature to the target temperature capable of being charged to the full-charge state is determined; determining the power which can be distributed to the battery by the vehicle-mounted charger when the battery is heated, namely the remaining available power, and taking the ratio of the product of the remaining available power and the heating time to the rated electric quantity of the power battery as the state of charge which can be increased in the heating process of the power battery, namely the state of charge increasing quantity; then, based on the difference value between the state of charge (namely 100%) and the state of charge increment when the power battery is in a full state, obtaining a first state of charge of the power battery; and finally, when the state of charge of the power battery reaches the first state of charge, heating the power battery by adopting the heating power, and simultaneously charging the power battery by adopting the residual available power. In this way, the technical scheme of the present disclosure calculates the state of charge increment of the power battery in the heating process (i.e., in the heating time) from the current temperature to the target temperature capable of being charged to the full state based on the remaining available power capable of being used for charging the power battery when the power battery is heated, and the state of charge of the power battery when the power battery is heated, i.e., the first state of charge, is reversely deduced from the difference between the state of charge and the state of charge increment when the power battery is full, so that in the actual charging and overcharging of the power battery, when the state of charge of the power battery reaches the first state of charge, the power battery is heated by adopting the heating power, and the remaining available power is used for charging the power battery, so that the temperature of the power battery can be raised to the temperature of the full state of charge, and the heating time just can enable the state of charge of the power battery to be raised from the first state of charge to 100%, thereby ensuring that the power battery can be charged to the full state of charge in a low temperature environment, and improving the low Wen Xuhang capacity of an electric vehicle. Meanwhile, as the power battery is heated from the current temperature to the target temperature capable of being charged to the full-charge state, namely the heating time is far smaller than the charging time of the whole charging process of the power battery, and the heating starting time, namely the time when the state of charge of the power battery reaches the first state of charge, is calculated forward from the time when the state of charge of the power battery is full of charge, the power battery is heated at the tail end of the charging process of the power battery, and compared with the scheme that the power battery is heated when the charging is started, and the battery is continuously heated until the charging power of the battery is larger than the power of the vehicle-mounted charger, the heating time is shortened by the technical scheme, and therefore the heating energy consumption of the battery is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a flowchart of a power battery charging method according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a power battery charging device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Fig. 1 is a flowchart of a power battery charging method according to an embodiment of the present disclosure. The method is suitable for charging the electric automobile in a low-temperature environment, and is applied to an alternating-current slow charging scene. The method may be performed by a power battery charging device, which may be implemented in software and/or hardware. As shown in fig. 1, the method comprises the steps of:
S110, acquiring the power of a vehicle-mounted charger, the power of a vehicle-mounted accessory, the heating power of a power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery when the vehicle is charged.
In this embodiment, when the vehicle is charged, the vehicle-mounted charger provides power for charging the battery, for heating the battery, and for providing power for the vehicle-mounted accessory. The vehicle accessory power is the power provided by the vehicle charger for the vehicle accessory to operate. For example, when the vehicle is charged, a user may be in the vehicle, and at this time, because the external environment temperature is low, the user may turn on the air conditioner to heat the passenger cabin, and accordingly, the vehicle-mounted charger provides power for the air conditioner, that is, the vehicle-mounted accessory power includes the air conditioner operation power.
The target temperature is a temperature at which the power battery can be charged to a full state. Specifically, the power battery is composed of a battery pack, and the battery pack includes a plurality of battery cells, and generally, the battery cells (i.e., the power battery) can be charged to a full state at different temperatures. In order to determine the target temperature at which the power battery can be charged to the full charge state, the present embodiment performs a charging test on each type of battery cell at different temperatures in advance, and determines the temperature at which each type of battery cell can be charged to the full charge state when charging at different temperatures, as a charging test result. Accordingly, in some embodiments, obtaining the target temperature includes: acquiring the battery cell type of the power battery; and inquiring the temperature of the battery cell corresponding to the battery cell type and the current temperature to the full-charge state in the charging test results of the battery cells of different types at different temperatures to obtain the target temperature. The battery cell type can be represented by using a battery cell identifier, and the charging test result can be stored in the form of a data list, wherein the data list represents the corresponding relation between the battery cell identifier of each battery cell type and different test temperature data (corresponding to the current temperature) and the temperature (corresponding to the target temperature) of the battery cell charged to the full-power state. Therefore, after the battery cell type and the current temperature of the power battery are obtained, the target temperature which corresponds to the state that the power battery can be charged to the full power state can be inquired from the charging test result.
It should be noted that, considering that the battery temperature will also gradually rise when the battery is charged, the present temperature of the power battery may be obtained in real time in this embodiment, so as to update the subsequent parameters (such as the heating time and the first state of charge) related to the present temperature in real time. Therefore, the accuracy of the heating time can be improved, the heating time can be further reduced, and the heating energy consumption is reduced.
In the above scheme, the target temperature is the lowest temperature at which the power battery can be charged to the full-charge state. Therefore, under the condition that the power battery is guaranteed to be charged to a full-power state, the heating time can be further reduced, and the heating energy consumption is reduced.
And S120, determining the heating time required for heating the power battery from the current temperature to the target temperature based on the heating power.
In some embodiments, the temperature rise rate of the battery cell of the power battery under heating power can be obtained first; and obtaining the heating time based on the ratio of the difference value of the target temperature and the current temperature to the temperature rise rate of the battery cell. Specifically, based on three-dimensional CFD simulation, the temperature change simulation of the liquid cooling system heating process can be performed on the battery system, and the temperature rise rate of the battery inside under the heating power is extracted, so that the heating rate of the power battery is obtained; and then, the target temperature and the current temperature are subjected to difference, and the obtained difference is divided by the heating rate to obtain the heating time.
And S130, determining a first charge state of the power battery based on a difference value between the charge state of the power battery in the full charge state and the charge state increment of the power battery in the heating time.
The charge state increment is obtained by multiplying the remaining available power of the vehicle-mounted charger by the heating time and dividing the multiplied power by the rated power of the power battery, and the remaining available power is obtained by subtracting the vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power. Accordingly, the first state of charge of the present embodiment can be obtained by using the following formula: SOC 0＝100％-Pc*L0/Q; wherein, SOC 0 is the first state of charge, 100% is the state of charge when the battery is full, P c is the remaining power available, L 0 is the heating time, and Q is the rated power of the power battery.
And S140, in response to the state of charge of the power battery reaching the first state of charge, heating the power battery based on the heating power, and charging the power battery based on the remaining available power.
Thus, based on S130, when the state of charge of the power battery reaches the first state of charge, the power battery is heated by the heating power, so that the temperature of the power battery can be heated to the target temperature at which the power battery can be charged to the full state, and the power battery is charged by the remaining available power, so that the power battery can be just charged to the full state when the temperature of the power battery is raised to the target temperature.
In summary, in the power battery charging method provided by the embodiment of the present disclosure, a heating time required when the power battery is heated from a current temperature to a target temperature capable of being charged to a full-charge state is determined; determining the power which can be distributed to the battery by the vehicle-mounted charger when the battery is heated, namely the remaining available power, and taking the ratio of the product of the remaining available power and the heating time to the rated electric quantity of the power battery as the state of charge which can be increased in the heating process of the power battery, namely the state of charge increasing quantity; then, based on the difference value between the state of charge (namely 100%) and the state of charge increment when the power battery is in a full state, obtaining a first state of charge of the power battery; and finally, when the state of charge of the power battery reaches the first state of charge, heating the power battery by adopting the heating power, and simultaneously charging the power battery by adopting the residual available power. In this way, the technical scheme of the present disclosure calculates the state of charge increment of the power battery in the heating process (i.e., in the heating time) from the current temperature to the target temperature capable of being charged to the full state based on the remaining available power capable of being used for charging the power battery when the power battery is heated, and the state of charge of the power battery when the power battery is heated, i.e., the first state of charge, is reversely deduced from the difference between the state of charge and the state of charge increment when the power battery is full, so that in the actual charging and overcharging of the power battery, when the state of charge of the power battery reaches the first state of charge, the power battery is heated by adopting the heating power, and the remaining available power is used for charging the power battery, so that the temperature of the power battery can be raised to the temperature of the full state of charge, and the heating time just can enable the state of charge of the power battery to be raised from the first state of charge to 100%, thereby ensuring that the power battery can be charged to the full state of charge in a low temperature environment, and improving the low Wen Xuhang capacity of an electric vehicle. Meanwhile, as the power battery is heated from the current temperature to the target temperature capable of being charged to the full-charge state, namely the heating time is far smaller than the charging time of the whole charging process of the power battery, and the heating starting time, namely the time when the state of charge of the power battery reaches the first state of charge, is calculated forward from the time when the state of charge of the power battery is full of charge, the power battery is heated at the tail end of the charging process of the power battery, and compared with the scheme that the power battery is heated when the charging is started, and the battery is continuously heated until the charging power of the battery is larger than the power of the vehicle-mounted charger, the heating time is shortened by the technical scheme, and therefore the heating energy consumption of the battery is reduced. Meanwhile, excessive heating energy consumption and overlong overall charging time length caused by too early starting heating are avoided, and the problem that the battery temperature cannot be heated to the target temperature caused by too late starting heating is avoided, so that the power battery cannot be charged to a full-charge state is avoided.
In some embodiments, before heating the power battery based on the heating power and charging the power battery based on the remaining available power in response to the state of charge of the power battery reaching the first state of charge, the method further comprises: obtaining a second state of charge based on a difference between the first state of charge and a preset state of charge redundancy, wherein the preset state of charge redundancy is used for eliminating the influence of a power battery temperature rise error; the second state of charge is taken as the first state of charge.
Considering that the actual increase in battery heating temperature may be affected by environmental or heating element errors, there may be a lower actual increase temperature. Therefore, to ensure that the power cell can be heated to the target temperature, the power cell may be heated in advance (the corresponding charging process may also be advanced). Therefore, in this embodiment, a preset state of charge redundancy is set, and the first state of charge and the preset state of charge redundancy are differenced to obtain the second state of charge, so that when the state of charge of the power battery reaches the second state of charge, the power battery is heated based on the heating power, and the power battery is charged based on the remaining available power. The redundancy amount of the preset charge state can be set according to actual conditions. Alternatively, the preset state of charge redundancy is 5% of the first state of charge, for example 80% of the first state of charge, the preset state of charge redundancy is 4% and the corresponding second state of charge is 76%.
In some embodiments, the method further comprises: before the state of charge of the power battery reaches the first state of charge, the power battery is charged based on the vehicle-mounted charger power. Therefore, before the state of charge of the power battery reaches the first state of charge, the full power of the vehicle-mounted charger is adopted to charge the power battery (the power of the vehicle-mounted charger cannot exceed the charging allowable power of the power battery under the alternating-current slow charging scene), so that the charging rate is greatly improved.
In some embodiments, before obtaining the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery, the method further comprises: acquiring the external environment temperature; if the external environment temperature is determined to be lower than the low-temperature charging temperature threshold value of the battery, the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, the current temperature of the power battery and the target temperature are obtained when the vehicle is charged.
Specifically, the battery low-temperature charging temperature threshold is used for judging whether the power battery can be charged to a full-charge state or not, the battery low-temperature charging temperature threshold can be set according to a specific battery core, when the external environment temperature is higher than or equal to the battery low-temperature charging temperature threshold, the battery is not required to be heated, and the power battery is charged in a conventional charging mode; when the external environment temperature is lower than the battery low-temperature charging temperature threshold value, the power battery charging method provided by the disclosure is adopted to charge the power battery.
Corresponding to the power battery charging method provided by the embodiment of the disclosure, the embodiment of the disclosure also provides a power battery charging device. Fig. 2 is a block diagram of a power battery charging device according to an embodiment of the present disclosure, and as shown in fig. 2, the power battery charging device includes:
The parameter obtaining module 21 is configured to obtain power of the vehicle-mounted charger, power of the vehicle-mounted accessory, heating power of the power battery provided by the vehicle-mounted charger, and current temperature and target temperature of the power battery, where the power of the vehicle-mounted accessory is provided by the vehicle-mounted charger for a running vehicle-mounted accessory, and the target temperature is a temperature at which the power battery can be charged to a full-power state;
A heating time determination module 22 for determining a heating time required for the power battery to be heated from the current temperature to the target temperature based on the heating power;
The first state of charge determining module 23 is configured to determine a first state of charge of the power battery based on a difference between a state of charge of the power battery when the power battery is in a full state and a state of charge increase of the power battery during a heating time, where the state of charge increase is obtained by multiplying a remaining available power of the vehicle-mounted charger by the heating time and dividing the power by a rated power of the power battery, and the remaining available power is obtained by subtracting the vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power;
the heating and charging module 24 is configured to heat the power battery based on the heating power and charge the power battery based on the remaining available power in response to the state of charge of the power battery reaching the first state of charge.
In some embodiments, the parameter acquisition module 21 is configured to:
acquiring the battery cell type of the power battery;
And inquiring the temperature of the battery cell corresponding to the battery cell type and the current temperature to the full-charge state in the charging test results of the battery cells of different types at different temperatures to obtain the target temperature.
In some embodiments, the target temperature is the lowest temperature at which the power cell can be charged to a full state.
In some embodiments, the heating time determination module 22 is to:
acquiring the temperature rise rate of an electric core of the power battery under heating power;
and obtaining the heating time based on the ratio of the difference between the target temperature and the current temperature and the temperature rise rate of the battery cell.
In some embodiments, the apparatus further comprises:
the second state of charge determining module is used for obtaining the second state of charge based on a difference value between the first state of charge and a redundancy amount of a preset state of charge before the state of charge of the power battery reaches the first state of charge, heating the power battery based on heating power and charging the power battery based on residual available power, wherein the redundancy amount of the preset state of charge is used for eliminating the influence of a temperature rise error of the power battery;
and the first charge state updating module is used for taking the second charge state as the first charge state.
In some embodiments, the thermal charging module 24 is further configured to:
before the state of charge of the power battery reaches the first state of charge, the power battery is charged based on the vehicle-mounted charger power.
In some embodiments, the apparatus further comprises:
The environment temperature acquisition module is used for acquiring the external environment temperature before acquiring the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, the current temperature and the target temperature of the power battery during charging of the vehicle;
And the temperature judging module is used for acquiring the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery when the vehicle is charged if the external environment temperature is lower than the battery low-temperature charging temperature threshold value.
The power battery charging device disclosed in the above embodiments can execute the power battery charging method disclosed in each embodiment, and has the same or corresponding beneficial effects, and in order to avoid repetition, the description is omitted here.
The disclosed embodiments also provide a computer-readable storage medium storing a program or instructions that cause a computer to perform the steps of any of the methods described above.
Illustratively, the program or instructions cause a computer to perform a method of charging a power battery, the method comprising:
Acquiring the power of a vehicle-mounted charger, the power of a vehicle-mounted accessory, the heating power of a power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery, wherein the power of the vehicle-mounted accessory is provided by the vehicle-mounted charger for running vehicle-mounted accessory, and the target temperature is the temperature at which the power battery can be charged to a full-charge state;
determining a heating time required for the power battery to heat from the current temperature to the target temperature based on the heating power;
Determining a first state of charge of the power battery based on a difference between a state of charge of the power battery in a full state and a state of charge increase of the power battery in a heating time, wherein the state of charge increase is obtained by multiplying a remaining available power of the vehicle-mounted charger by the heating time and dividing the power by a rated power of the power battery, and the remaining available power is obtained by subtracting a vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power;
In response to the state of charge of the power battery reaching the first state of charge, the power battery is heated based on the heating power and the power battery is charged based on the remaining available power.
Optionally, the computer executable instructions, when executed by the computer processor, may also be used to implement the technical solution of any of the power battery charging methods provided by the embodiments of the present disclosure, so as to achieve the corresponding beneficial effects.
From the above description of embodiments, it will be apparent to those skilled in the art that the disclosed embodiments may be implemented by means of software and necessary general purpose hardware, but may of course also be implemented by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the embodiments of the present disclosure may be embodied in essence or a portion contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, etc., including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.), to perform the method described in the embodiments of the present disclosure.
The disclosed embodiments also provide a vehicle including: one or more processors; a memory for storing one or more programs or instructions; the processor is used for executing the steps of any one of the methods by calling the program or the instruction stored in the memory, so as to realize the corresponding beneficial effects.
Fig. 3 is a schematic hardware structure of a vehicle according to an embodiment of the disclosure. As shown in fig. 3, the vehicle includes one or more processors 301 and memory 302.
The processor 301 may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities, and may control other components in the vehicle to perform desired functions.
Memory 302 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer readable storage medium that can be executed by the processor 301 to implement the power battery charging methods of the embodiments of the present disclosure described above, and/or other desired functions. Various contents such as an input signal, a signal component, a noise component, and the like may also be stored in the computer-readable storage medium.
In one example, the vehicle may further include: an input device 303, and an output device 304, which are interconnected by a bus system and/or other forms of connection mechanisms (not shown).
In addition, the input device 303 may also include, for example, a keyboard, a mouse, and the like.
The output device 304 may output various information to the outside, including the determined distance information, direction information, and the like. The output device 304 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, etc.
Of course, only some of the components of the vehicle that are relevant to the present disclosure are shown in fig. 3 for simplicity, components such as buses, input/output interfaces, etc. are omitted. In addition, the vehicle may include any other suitable components depending on the particular application.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1.A method of charging a power battery, comprising:
Acquiring power of a vehicle-mounted charger, power of a vehicle-mounted accessory, heating power of a power battery provided by the vehicle-mounted charger, and current temperature and target temperature of the power battery, wherein the power of the vehicle-mounted accessory is provided by the vehicle-mounted charger for running vehicle-mounted accessory, and the target temperature is the temperature at which the power battery can be charged to a full-power state;
determining a heating time required for the power battery to heat from the current temperature to the target temperature based on the heating power;
Determining a first state of charge of the power battery based on a difference between a state of charge of the power battery in a full state of charge and a state of charge increase of the power battery in the heating time, wherein the state of charge increase is obtained by multiplying a remaining available power of a vehicle-mounted charger by the heating time and dividing the multiplied power by a rated power of the power battery, and the remaining available power is obtained by subtracting the vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power;
in response to the state of charge of the power battery reaching the first state of charge, heating the power battery based on the heating power, and charging the power battery based on the remaining available power.
2. The method of claim 1, wherein obtaining the target temperature comprises:
acquiring the battery cell type of the power battery;
And inquiring the temperature of the battery cell corresponding to the battery cell category and the current temperature in the charging test results of the battery cells of different categories at different temperatures to obtain the target temperature.
3. A method according to claim 1 or 2, wherein the target temperature is the lowest temperature at which the power cell can be charged to a full state.
4. The method of claim 1, wherein determining a heating time required for the power cell to heat from the current temperature to the target temperature based on the heating power comprises:
acquiring the temperature rise rate of an electric core of the power battery under the heating power;
and obtaining the heating time based on the ratio of the difference value of the target temperature and the current temperature to the temperature rise rate of the battery cell.
5. The method of claim 1, wherein prior to heating the power battery based on the heating power and charging the power battery based on the remaining available power in response to the state of charge of the power battery reaching the first state of charge, the method further comprises:
Obtaining a second state of charge based on a difference between the first state of charge and a preset state of charge redundancy, wherein the preset state of charge redundancy is used for eliminating the influence of the temperature rise error of the power battery;
and taking the second charge state as a first charge state.
6. The method according to claim 1, wherein the method further comprises:
and charging the power battery based on the vehicle-mounted charger power before the state of charge of the power battery reaches the first state of charge.
7. The method of claim 1, wherein prior to obtaining the power of the on-board charger when the vehicle is charged, the power of the on-board accessory, the heating power of the power battery that the on-board charger can provide, and the current and target temperatures of the power battery, the method further comprises:
acquiring the external environment temperature;
And if the external environment temperature is determined to be lower than the low-temperature charging temperature threshold value of the battery, acquiring the power of the vehicle-mounted charger, the power of the vehicle-mounted accessory, the heating power of the power battery provided by the vehicle-mounted charger, and the current temperature and the target temperature of the power battery when the vehicle is charged.
8. A power battery charging apparatus, comprising:
The system comprises a parameter acquisition module, a power control module and a power control module, wherein the parameter acquisition module is used for acquiring power of a vehicle-mounted charger, power of a vehicle-mounted accessory, heating power of a power battery provided by the vehicle-mounted charger, current temperature and target temperature of the power battery, wherein the power of the vehicle-mounted accessory is provided by the vehicle-mounted charger for a running vehicle-mounted accessory, and the target temperature is the temperature at which the power battery can be charged to a full-charge state;
a heating time determination module for determining a heating time required for the power battery to heat from the current temperature to the target temperature based on the heating power;
The first state of charge determining module is used for determining the first state of charge of the power battery based on a difference value between the state of charge of the power battery in a full state and the state of charge increment of the power battery in the heating time, wherein the state of charge increment is obtained by multiplying the remaining available power of the vehicle-mounted charger by the heating time and dividing the power by the rated power of the power battery, and the remaining available power is obtained by subtracting the vehicle-mounted accessory power and the heating power from the vehicle-mounted charger power;
And the heating and charging module is used for heating the power battery based on the heating power and charging the power battery based on the residual available power in response to the state of charge of the power battery reaching the first state of charge.
9. A computer readable storage medium storing a program or instructions for causing a computer to perform the steps of the method according to any one of claims 1 to 7.
10. A vehicle, characterized by comprising:
One or more processors;
a memory for storing one or more programs or instructions;
The processor is adapted to perform the steps of the method according to any of claims 1 to 7 by invoking a program or instruction stored in the memory.
CN202310141813.1A 2023-02-14 2023-02-14 Power battery charging method, device, medium and vehicle Pending CN118494287A (en)

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JP5699702B2 (en) * 2011-03-11 2015-04-15 日産自動車株式会社 Vehicle charging control device
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