CN110065394A - A kind of power battery monomer low-voltage protection method and system - Google Patents

A kind of power battery monomer low-voltage protection method and system Download PDF

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Publication number
CN110065394A
CN110065394A CN201910249190.3A CN201910249190A CN110065394A CN 110065394 A CN110065394 A CN 110065394A CN 201910249190 A CN201910249190 A CN 201910249190A CN 110065394 A CN110065394 A CN 110065394A
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China
Prior art keywords
voltage
monomer
charge
discharge
under
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CN201910249190.3A
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Inventor
张昉昀
刘心文
赵明
刘艳
宗福才
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FJ Motor Group Yudo New Energy Automobile Co Ltd
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FJ Motor Group Yudo New Energy Automobile Co Ltd
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Priority to CN201910249190.3A priority Critical patent/CN110065394A/en
Publication of CN110065394A publication Critical patent/CN110065394A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04Cutting off the power supply under fault conditions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention relates to a kind of power battery monomer low-voltage protection method and systems, the described method comprises the following steps: charge and discharge control: VCU carries out charge and discharge control to motor according to the charge-discharge electric power received;The judgement of level-one under-voltage fault: whether BMS judges minimum monomer voltage in the first preset time less than the first preset voltage value;It is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery;If it is not, then executing the judgement of second level under-voltage fault: BMS judge minimum monomer voltage in the second preset time whether less than the second preset voltage value, second preset voltage value is greater than first preset voltage value;If so, executing reduces power: charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power by BMS, and the charge-discharge electric power after reduction is sent to VCU;If it is not, being then back to charge and discharge control.It avoids making the erroneous judgement of paired fault because the acquisition of monomer voltage receives the interference of periphery electromagnetic field.

Description

A kind of power battery monomer low-voltage protection method and system
Technical field
The present invention relates to electric car field, in particular to a kind of power battery monomer low-voltage protection method and system.
Background technique
Electric car (BEV) refers to using vehicle power supply as power, with motor driven wheels travel, meets road traffic, peace The vehicle of full regulation requirements.Since effect on environment is smaller with respect to orthodox car, its prospects are considered optimistic wildly, but current skill Art is still immature.And for electric car, power battery is vital, if the monomer lower terminal voltage of battery not by To being effectively protected, it mainly will appear over-discharge, entire battery pack all by failure and cannot again be used;In addition if protected not When meeting breaks high pressure suddenly, causes to shut down, and causes very inconvenient and trailer expense loss to client;Excessive protection meeting Occur also will appear the deficiency of continuation of the journey, or continuation of the journey and SOC (State Of Charge, state-of-charge) do not correspond to.Although and existing In some technologies, application No. is CN201711227691.9 to disclose a kind of electric car discharge prevention method, simply by The case where minimum monomer voltage judged, but since voltage acquisition will receive the interference of periphery electromagnetic field, and there are fluctuations, may The case where in the presence of erroneous judgement.
Summary of the invention
For this reason, it may be necessary to provide a kind of power battery monomer low-voltage protection method and system, solves existing power battery and protect The defect of shield and by minimum monomer voltage judgement be easy to appear error the problem of.
To achieve the above object, a kind of power battery monomer low-voltage protection method is inventor provided, comprising the following steps:
Signal acquisition: BMS acquires the monomer voltage of power battery in real time;
Voltage calculates: and minimum monomer voltage is calculated according to the monomer voltage;
Power calculation: BMS calculates corresponding charge-discharge electric power according to minimum monomer voltage, and the charge-discharge electric power of calculating is sent out It send to VCU;
Charge and discharge control: VCU carries out charge and discharge control to motor according to the charge-discharge electric power received;
The judgement of level-one under-voltage fault: BMS judges whether minimum monomer voltage is default less than first in the first preset time Voltage value;
It is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery;
If it is not, then executing the judgement of second level under-voltage fault: BMS judges whether minimum monomer voltage is small in the second preset time In the second preset voltage value, second preset voltage value is greater than first preset voltage value;
If so, executing reduces power: charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power by BMS, and Charge-discharge electric power after reduction is sent to VCU;
If it is not, being then back to charge and discharge control.
It advanced optimizes, the voltage calculates further include: calculates highest monomer voltage according to the monomer voltage;
Further include pressure difference screening before the first under-voltage judgement: calculating the electricity of highest monomer voltage and minimum monomer voltage Pressure difference is pressed, judges whether the voltage difference is greater than threshold pressure differential;
If so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, and will be analyzed in result Report and storage;
If otherwise executing the judgement of level-one under-voltage fault.
It advanced optimizes, further includes the under-voltage event of three-level between the level-one under-voltage fault judgement and the judgement of second level under-voltage fault Barrier judgement:
Judge whether minimum monomer voltage is less than third preset voltage value, the default electricity of the third in third preset time Pressure value is greater than the first preset voltage value, less than the second preset voltage value;
If so then execute reduction electric current: BMS reduces electric current, when current reduction to pre-set current value, cutting electric discharge;
If it is not, then executing the judgement of second level under-voltage fault.
It advanced optimizes, first preset time is greater than third preset time, and the third preset time is greater than second Preset time.
It advanced optimizes, the signal acquisition further include: acquire the monomer temperature value of power battery;
The power calculation specifically includes: according to the minimum monomer voltage and monomer temperature value, searching to obtain to SOP table Corresponding charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
Inventor additionally provides another technical solution: a kind of power battery monomer undervoltage protection system, including BMS and VCU;
The BMS includes signal acquisition module, power computation module and fault diagnosis module;
The signal acquisition module for acquiring the monomer voltage of power battery in real time;
The fault diagnosis module is also used to calculate minimum monomer voltage according to the monomer voltage acquired in real time, according to described Minimum monomer obtains the under-voltage grade of monomer, and the under-voltage grade of monomer includes level-one under-voltage fault and second level under-voltage fault, described Level-one under-voltage fault is for minimum monomer voltage less than the first preset voltage value, the second level under-voltage fault in the first preset time For minimum monomer voltage less than the second preset voltage value in the second preset time, when the under-voltage grade of monomer is level-one under-voltage fault When, then according to the operating mode of BMS, the charge and discharge of single battery are cut off, when the under-voltage grade of monomer is second level under-voltage fault, then Charge-discharge electric power will be reduced to the presupposition multiple of original charge-discharge electric power, and the charge-discharge electric power after reduction is sent to VCU;
The power computation module is used to calculate corresponding charge-discharge electric power according to minimum monomer voltage, by the charge and discharge of calculating Electrical power is sent to VCU;
The VCU is used to carry out charge and discharge control to motor according to the charge-discharge electric power received.
It advanced optimizing, the fault diagnosis module is also used to calculate highest monomer voltage according to the monomer voltage, The voltage difference for calculating highest monomer voltage and minimum monomer voltage, judges whether the voltage difference is greater than threshold pressure differential, if Be to execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, and analysis result is reported and stored.
It advanced optimizes, the under-voltage grade of monomer further includes three-level under-voltage fault, and the three-level under-voltage fault is minimum Monomer voltage is less than third preset voltage value in third preset time;
The fault diagnosis module is also used to when the under-voltage grade of monomer be three-level under-voltage fault, then reduces electric current, work as electric current When being reduced to pre-set current value, cutting electric discharge.
It advanced optimizes, first preset time is greater than third preset time, and the third preset time is greater than second Preset time.
It advanced optimizes, the signal acquisition module is also used to acquire the monomer temperature value of power battery;
The power computation module is used to search to obtain to SOP table according to the minimum monomer voltage and monomer temperature value Corresponding charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
It is different from the prior art, above-mentioned technical proposal, by acquiring the monomer voltage of power battery, and is calculated minimum Monomer voltage, by judging whether minimum monomer voltage is lower than the first preset voltage value in the first preset time, if so, sentencing There is serious under-voltage fault in disconnected power battery, then disconnects power battery charge and discharge, carries out under-voltage protection to power battery, if It is no, then judge whether minimum monomer voltage is lower than the second preset voltage value in the second preset time, if so, original is filled Discharge power reduce it is general, although also allowing to discharge, more electricity can be put, prevent battery so that monomer voltage is smaller Automobile is shut down, and battery cell voltage under-voltage protection also considers that the operating condition of charging does not allow in the case where monomer is especially low Electric discharge does not also allow to charge simultaneously, prevents the destruction that irreversible electrochemistry level is caused to battery;And in addition to minimum list Bulk voltage is judged, by coming together to judge in conjunction with the persistent anomaly time, is avoided because the acquisition of monomer voltage receives periphery The erroneous judgement of paired fault is made in the interference of electromagnetic field.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of power battery monomer low-voltage protection method described in specific embodiment;
Fig. 2 is another flow diagram of power battery monomer low-voltage protection method described in specific embodiment;
Fig. 3 is a kind of structural schematic diagram of power battery monomer undervoltage protection system described in specific embodiment;
Fig. 4 is a kind of structural schematic diagram of BMS described in specific embodiment;
Fig. 5 is a kind of process schematic that fault diagnosis module described in specific embodiment judges level-one under-voltage fault;
Fig. 6 is a kind of process schematic that fault diagnosis module described in specific embodiment judges second level under-voltage fault;
Fig. 7 is a kind of process schematic that fault diagnosis module described in specific embodiment judges three-level under-voltage fault.
Description of symbols:
310,BMS;
310, signal acquisition module,
312, fault diagnosis module,
313, power computation module,
320, VCU,
330、MCU。
Specific embodiment
Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality It applies example and attached drawing is cooperated to be explained in detail.
Noun occurred in embodiment is explained at this first:
VCU:Vehicle Control Unit, full-vehicle control unit
BMS:Battery Management System, battery management system
MCU:Motor Control Unit, electric machine controller
SOP:State Of Power, charge-discharge electric power state
Referring to Fig. 1, power battery monomer low-voltage protection method described in the present embodiment, comprising the following steps:
Signal acquisition S110:BMS acquires the monomer voltage of power battery in real time;
Voltage calculates S120: and minimum monomer voltage is calculated according to the monomer voltage;
Power calculation S130:BMS calculates corresponding charge-discharge electric power according to minimum monomer voltage, by the charge and discharge electric work of calculating Rate is sent to VCU;
Charge and discharge control S140:VCU carries out charge and discharge control to motor according to the charge-discharge electric power received;
Level-one under-voltage fault judges that S150:BMS judges minimum monomer voltage in the first preset time whether less than first Preset voltage value;
S151 is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery;
If it is not, then executing second level under-voltage fault judges that S160:BMS judges that minimum monomer voltage is in the second preset time It is no less than the second preset voltage value, second preset voltage value is greater than first preset voltage value;
If so, executing reduces default times that charge-discharge electric power is reduced to original charge-discharge electric power by power S161:BMS Number, and the charge-discharge electric power after reduction is sent to VCU;
If it is not, being then back to charge and discharge control S140.
BMS acquires the monomer voltage of power battery in real time, wherein monomer voltage collection period is 100ms;And according to adopting Minimum monomer voltage Vmin is calculated in the monomer voltage collected, wherein can according to calculated minimum monomer voltage Vmin, Corresponding charge-discharge electric power is calculated, and the charge-discharge electric power is sent to VCU by CAN, VCU is according to the charge and discharge received Electrical power carries out charge and discharge control to motor, specific to be requested such as VCU according to the operating condition of the charge-discharge electric power and vehicle received The operating mode of BMS, and the request of torque and revolving speed is sent to MCU;Request that MCU according to the torque and revolving speed received Control the revolving speed of motor;Wherein, under-voltage fault judgement is carried out according to the minimum monomer voltage Vmin being calculated;One is carried out first Whether grade under-voltage fault judgement, judge minimum monomer voltage Vmin in the first preset time t 1 less than the first preset voltage value V1, i.e., as Vmin≤V1, t starts timing, and during timing, when Vmin > V1, then t sets 0, and works as t > t1, then sets There is level-one under-voltage fault, i.e. most serious monomer failure in power battery, then BMS is that direct block system relay is cut in security consideration The charge and discharge of disconnected power battery, i.e., improper minimum monomer voltage Vmin is in the first preset time t 1 less than the first preset voltage value V1 disconnects charge relay when BMS is in charge mode, terminates charging, when BMS is in discharge mode, disconnects main positive relay, Terminate electric discharge, battery cell voltage under-voltage protection also considers that the operating condition of charging does not allow to discharge in the case where monomer is especially low Also do not allow to charge simultaneously, prevents the destruction for causing irreversible electrochemistry level to battery;And work as minimum monomer voltage Vmin Whether > V1 then carries out second level under-voltage fault judgement, judge minimum monomer voltage Vmin in the second preset time t 2 less than Two preset voltage value V2, i.e., as Vmin≤V2, t starts timing, and during timing, when Vmin > V2, then t sets 0, and works as T > t2 then sets power battery and second level under-voltage fault occurs, although and at this point, monomer voltage is smaller, also allow to put more Electricity, then charge-discharge electric power is reduced, charge-discharge electric power is reduced to the half of original charge-discharge electric power, i.e., by charge and discharge Electrical power is reduced to the half of the corresponding charge-discharge electric power of minimum monomer voltage Vmin, and power battery is allow put more Electricity, and the monomer voltage for reminding user current is lower, prevents electric car from shutting down;And in addition to minimum monomer voltage Judged, by coming together to judge in conjunction with the persistent anomaly time, is avoided because the acquisition of monomer voltage receives periphery electromagnetic field Interference, make the erroneous judgement of paired fault.
Wherein, in order to obtaining accurate charge-discharge electric power, the signal acquisition further include: acquire the list of power battery Body temperature angle value;The power calculation specifically includes: according to the minimum monomer voltage and monomer temperature value, searching SOP table VCU is sent to corresponding charge-discharge electric power, and by the charge-discharge electric power found.By the monomer temperature for acquiring power battery Value, wherein the period of monomer temperature value acquisition is 1S;According to minimum monomer voltage and monomer temperature value, SOP table is searched to obtain Corresponding charge-discharge electric power, available accurate charge-discharge electric power allow VCU according to accurate charge-discharge electric power to motor Carry out optimal control charge and discharge.
Referring to Fig. 2, in the present embodiment, power battery be likely to occur due to electric core aging occur gathering line loosen or The situation of voltage acquisition exception needs to screen the monomer pressure difference of power battery, and the voltage calculates further include: according to institute It states monomer voltage and calculates highest monomer voltage;
Further include pressure difference screening S170 before the first under-voltage judgement S150: calculating highest monomer voltage and minimum monomer The voltage difference of voltage, judges whether the voltage difference is greater than threshold pressure differential;
Analyze S171 if so then execute pressure difference: analysis is monomer voltage acquisition abnormity or electric core aging, and analysis is tied Fruit reports and stores;
If otherwise executing level-one under-voltage fault judges S150.
According to collected monomer voltage, highest monomer voltage and minimum monomer voltage is calculated,
According to collected monomer voltage, highest monomer voltage and minimum monomer voltage are calculated, highest is then calculated Voltage difference between monomer voltage and minimum monomer voltage, judges whether calculated voltage difference is greater than the pressure difference threshold of setting Value then carries out failure cause judgement to monomer pressure difference when voltage difference is greater than threshold pressure differential extremely, analysis be acquisition abnormity or The problem of electric core aging, and analysis result is reported and stored, allow to carry out corresponding event for monomer pressure difference failure Barrier processing.The failure mode for distinguishing monomer pressure difference is increased, more accurately the reason of positioning failure, preferably checks problem and guarantor Protect battery.
Referring to Fig. 2, in the present embodiment, and it may cause relay adhesion in high current block system relay, described one It further includes that three-level under-voltage fault judges S180 between S160 that grade under-voltage fault, which judges that S150 and second level under-voltage fault judge: judgement is most Whether low monomer voltage is less than third preset voltage value in third preset time, and it is pre- that the third preset voltage value is greater than first If voltage value, less than the second preset voltage value;
Electric current is reduced if so then execute electric current S181:BMS is reduced, when current reduction to pre-set current value, cutting electric discharge;
If it is not, then executing second level under-voltage fault judges S160.
After level-one under-voltage fault judges, the judgement of three-level under-voltage fault is carried out, judges minimum monomer voltage Vmin in third Whether it is less than third preset voltage value V3 in preset time t 3, as Vmin≤V3, t starts timing, the Vmin in timing course When > V3, t sets 0;As t > t3, the under-voltage three-level under-voltage fault of monomer is set, BMS carries out drop current practice at this time, and in electric current When less than pre-set current value, block system relay is prevented under the operating condition of high current, and relay, which is directly cut off, causes the viscous of relay Even;And in the case where not being particularly urgent, i.e., three-level under-voltage fault when, electric current block system relay again actively drops, only especially In the case where urgent, i.e. level-one under-voltage fault just direct block system relay.Wherein, in order to judge more rapidly, described first is default Time is greater than third preset time, and the third preset time is greater than the second preset time.
Fig. 3-6 is please referred to, in another embodiment, a kind of power battery monomer undervoltage protection system, including BMS310 And VCU320;
The BMS310 includes signal acquisition module 311, power computation module 313313 and fault diagnosis module 312;
The signal acquisition module 311 for acquiring the monomer voltage of power battery in real time;
The fault diagnosis module 312 is also used to calculate minimum monomer voltage according to the monomer voltage acquired in real time, according to The minimum monomer obtains the under-voltage grade of monomer, and the under-voltage grade of monomer includes level-one under-voltage fault and second level under-voltage fault, The level-one under-voltage fault be minimum monomer voltage in the first preset time less than the first preset voltage value, the second level is under-voltage Failure be minimum monomer voltage in the second preset time less than the second preset voltage value, when the under-voltage grade of monomer is that level-one is under-voltage When failure, then according to the operating mode of BMS, the charge and discharge of single battery are cut off, when the under-voltage grade of monomer is second level under-voltage fault When, then charge-discharge electric power will be reduced to the presupposition multiple of original charge-discharge electric power, and the charge-discharge electric power after reduction is sent To VCU320;
The power computation module 313313 is used to calculate corresponding charge-discharge electric power according to minimum monomer voltage, will calculate Charge-discharge electric power be sent to VCU320;
The VCU320 is used to carry out charge and discharge control to motor according to the charge-discharge electric power received.
The monomer voltage of the acquisition power battery in real time of signal acquisition module 311, wherein monomer voltage collection period is 100ms;Minimum monomer voltage Vmin is calculated according to collected monomer voltage in fault diagnosis module 312, wherein power meter Corresponding charge-discharge electric power can be calculated, and should according to calculated minimum monomer voltage Vmin by calculating module 313313 Charge-discharge electric power is sent to VCU320 by CAN, and VCU320 is automatically controlled to motor progress charge and discharge according to the charge-discharge electric power received System, the specific operating mode for requesting BMS310 according to the operating condition of the charge-discharge electric power and vehicle received such as VCU320, and it is right The request of MCU330 transmission torque and revolving speed;Turn MCU330 according to torque and revolving speed the request control motor received Speed;Wherein, fault diagnosis module 312 judges to obtain monomer according to the minimum monomer voltage Vmin progress under-voltage fault being calculated Under-voltage grade;First carry out the judgement of level-one under-voltage fault, judge minimum monomer voltage Vmin in the first preset time t 1 whether Less than the first preset voltage value V1, i.e., as Vmin≤V1, t starts timing, and during timing, when Vmin > V1, then t is set 0, and work as t > t1, then setting power battery there is level-one under-voltage fault, i.e. most serious monomer failure, then BMS310 is that safety is examined Consider, by direct block system relay, cuts off the charge and discharge of power battery, i.e., improper minimum monomer voltage Vmin is in the first preset time Less than the first preset voltage value V1 in t1, when BMS310 is in charge mode, disconnection charge relay terminates charging, when BMS310 disconnects main positive relay in discharge mode, terminates electric discharge, and battery cell voltage under-voltage protection also considers the work of charging Condition does not allow to discharge while also not allowing to charge, prevent from causing battery irreversible electrification in the case where monomer is especially low Learn the destruction of level;And work as minimum monomer voltage Vmin > V1, then second level under-voltage fault judgement is carried out, judges minimum monomer voltage Whether less than the second preset voltage value V2 in the second preset time t 2, i.e., as Vmin≤V2, t starts timing to Vmin, is counting When during, when Vmin > V2, then t sets 0, and works as t > t2, then set power battery and second level under-voltage fault occur, and at this point, Although monomer voltage is smaller, also allows to put more electricity, then charge-discharge electric power is reduced, charge-discharge electric power is reduced For the half of original charge-discharge electric power, i.e., charge-discharge electric power is reduced to the corresponding charge-discharge electric power of minimum monomer voltage Vmin Half, allow power battery to carry out putting more electricity, and the monomer voltage for reminding user current is lower, prevent electronic vapour Vehicle is shut down;And in addition to judging minimum monomer voltage, by coming together to judge in conjunction with the persistent anomaly time, avoid Because the acquisition of monomer voltage receives the interference of periphery electromagnetic field, the erroneous judgement of paired fault is made.
Wherein, in order to obtain accurate charge-discharge electric power, the signal acquisition module 311 is also used to acquire power electric The monomer temperature value in pond;The power computation module 313313 is used for according to the minimum monomer voltage and monomer temperature value, right SOP table is searched to obtain corresponding charge-discharge electric power, and the charge-discharge electric power found is sent to VCU320.Signal acquisition module 311 pass through the monomer temperature value of acquisition power battery, wherein the period of monomer temperature value acquisition is 1S;Power computation module 313313 according to minimum monomer voltage and monomer temperature value, searches SOP table to obtain corresponding charge-discharge electric power, available standard True charge-discharge electric power allows VCU320 to carry out optimal control charge and discharge to motor according to accurate charge-discharge electric power.
In the present embodiment, power battery is likely to occur since gathering line loosening occurs in electric core aging or voltage acquisition is different Normal situation needs to screen the monomer pressure difference of power battery, and the fault diagnosis module 312 is also used to according to the list Bulk voltage calculates highest monomer voltage, calculates the voltage difference of highest monomer voltage and minimum monomer voltage, judges the electricity Whether pressure pressure difference is greater than threshold pressure differential, and if so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, And analysis result is reported and stored.Fault diagnosis module 312 calculates highest monomer voltage according to collected monomer voltage And minimum monomer voltage, the voltage difference between highest monomer voltage and minimum monomer voltage is then calculated, judgement calculates Voltage difference whether be greater than the threshold pressure differential of setting, when voltage difference is greater than threshold pressure differential, then monomer pressure difference is carried out extremely The problem of failure cause judgement, analysis is acquisition abnormity or electric core aging, and analysis result is reported and stored, allow to Corresponding troubleshooting is carried out for monomer pressure difference failure.The failure mode for distinguishing monomer pressure difference is increased, it is more fixed The reason of position failure, preferably investigation problem and protection battery.
Referring to Fig. 7, in the present embodiment, and may cause relay adhesion, the list in high current block system relay Grade that body is under-voltage further includes three-level under-voltage fault, and the three-level under-voltage fault is that minimum monomer voltage is small in third preset time In third preset voltage value;The fault diagnosis module 312 is also used to when the under-voltage grade of monomer be three-level under-voltage fault, then reduces Electric current, when current reduction to pre-set current value, cutting electric discharge.After level-one under-voltage fault judges, three-level under-voltage fault is carried out Judgement, judge minimum monomer voltage Vmin in third preset time t 3 whether be less than third preset voltage value V3, when Vmin≤ When V3, t starts timing, and in timing course when Vmin > V3, t sets 0;As t > t3, event that the setting under-voltage three-level of monomer is under-voltage Barrier, BMS carries out drop current practice at this time, and when electric current is less than pre-set current value, block system relay prevents the work in high current Under condition, relay directly cuts off the adhesion for causing relay;And in the case where not being particularly urgent, i.e. three-level under-voltage fault When, electric current block system relay again actively drops, and only in the case where particularly urgent, i.e., level-one under-voltage fault just directly cuts off relay Device.Wherein, in order to judge more rapidly, first preset time is greater than third preset time, and the third preset time is greater than Second preset time.
It should be noted that being not intended to limit although the various embodiments described above have been described herein Scope of patent protection of the invention.Therefore, it based on innovative idea of the invention, change that embodiment described herein is carried out and is repaired Change, or using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it directly or indirectly will be with Upper technical solution is used in other related technical areas, is included within scope of patent protection of the invention.

Claims (10)

1. a kind of power battery monomer low-voltage protection method, which comprises the following steps:
Signal acquisition: BMS acquires the monomer voltage of power battery in real time;
Voltage calculates: and minimum monomer voltage is calculated according to the monomer voltage;
Power calculation: BMS calculates corresponding charge-discharge electric power according to minimum monomer voltage, and the charge-discharge electric power of calculating is sent to VCU;
Charge and discharge control: VCU carries out charge and discharge control to motor according to the charge-discharge electric power received;
The judgement of level-one under-voltage fault: whether BMS judges minimum monomer voltage in the first preset time less than the first predeterminated voltage Value;
It is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery;
If it is not, then executing the judgement of second level under-voltage fault: whether BMS judges minimum monomer voltage in the second preset time less than the Two preset voltage values, second preset voltage value are greater than first preset voltage value;
If so, executing reduces power: charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power by BMS, and will drop Charge-discharge electric power after low is sent to VCU;
If it is not, being then back to charge and discharge control.
2. power battery monomer low-voltage protection method according to claim 1, which is characterized in that the voltage calculating is also wrapped It includes: highest monomer voltage is calculated according to the monomer voltage;
Further include pressure difference screening before the first under-voltage judgement: calculating the voltage pressure of highest monomer voltage and minimum monomer voltage Difference, judges whether the voltage difference is greater than threshold pressure differential;
If so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, and will analysis result report and Storage;
If otherwise executing the judgement of level-one under-voltage fault.
3. power battery monomer low-voltage protection method according to claim 1, which is characterized in that the level-one under-voltage fault is sentenced Further include the judgement of three-level under-voltage fault between the judgement of disconnected and second level under-voltage fault:
Judge whether minimum monomer voltage is less than third preset voltage value, the third preset voltage value in third preset time Greater than the first preset voltage value, less than the second preset voltage value;
If so then execute reduction electric current: BMS reduces electric current, when current reduction to pre-set current value, cutting electric discharge;
If it is not, then executing the judgement of second level under-voltage fault.
4. power battery monomer low-voltage protection method according to claim 3, which is characterized in that first preset time is small In third preset time, the third preset time is less than the second preset time.
5. power battery monomer low-voltage protection method according to claim 1, which is characterized in that the signal acquisition is also wrapped It includes: acquiring the monomer temperature value of power battery;
The power calculation specifically includes: according to the minimum monomer voltage and monomer temperature value, searching SOP table and is corresponded to Charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
6. a kind of power battery monomer undervoltage protection system, which is characterized in that including BMS and VCU;
The BMS includes signal acquisition module, power computation module and fault diagnosis module;
The signal acquisition module for acquiring the monomer voltage of power battery in real time;
The fault diagnosis module is also used to calculate minimum monomer voltage according to the monomer voltage acquired in real time, according to described minimum Monomer obtains the under-voltage grade of monomer, and the under-voltage grade of monomer includes level-one under-voltage fault and second level under-voltage fault, the level-one Under-voltage fault be minimum monomer voltage in the first preset time less than the first preset voltage value, the second level under-voltage fault is most Low monomer voltage in the second preset time less than the second preset voltage value, when the under-voltage grade of monomer is level-one under-voltage fault, Then according to the operating mode of BMS, the charge and discharge of single battery are cut off, when the under-voltage grade of monomer is second level under-voltage fault, then will Charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power, and the charge-discharge electric power after reduction is sent to VCU;
The power computation module is used to calculate corresponding charge-discharge electric power according to minimum monomer voltage, by the charge and discharge electric work of calculating Rate is sent to VCU;
The VCU is used to carry out charge and discharge control to motor according to the charge-discharge electric power received.
7. power battery monomer undervoltage protection system according to claim 6, which is characterized in that the fault diagnosis module is also For calculating highest monomer voltage according to the monomer voltage, the voltage pressure of highest monomer voltage and minimum monomer voltage is calculated Difference, judges whether the voltage difference is greater than threshold pressure differential, and if so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity Or electric core aging, and analysis result is reported and stored.
8. power battery monomer undervoltage protection system according to claim 6, which is characterized in that the under-voltage grade of monomer is also Including second level under-voltage fault, the second level under-voltage fault is that minimum monomer voltage is less than the default electricity of third in third preset time Pressure value;
The fault diagnosis module is also used to when the under-voltage grade of monomer be second level under-voltage fault, then reduces electric current, work as current reduction When to pre-set current value, cutting electric discharge.
9. power battery monomer undervoltage protection system according to claim 8, which is characterized in that first preset time is small In third preset time, the third preset time is less than the second preset time.
10. power battery monomer undervoltage protection system according to claim 6, which is characterized in that the signal acquisition module It is also used to acquire the monomer temperature value of power battery;
The power computation module is used to search SOP table according to the minimum monomer voltage and monomer temperature value and be corresponded to Charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
CN201910249190.3A 2019-03-29 2019-03-29 A kind of power battery monomer low-voltage protection method and system Pending CN110065394A (en)

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CN114714967B (en) * 2021-01-04 2024-05-28 广汽埃安新能源汽车有限公司 SOP dynamic control method and device for battery voltage
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CN115230533A (en) * 2022-07-25 2022-10-25 重庆长安汽车股份有限公司 Pre-undervoltage power control strategy and pre-undervoltage power control system for power battery system
CN115635880A (en) * 2022-10-31 2023-01-24 重庆长安新能源汽车科技有限公司 Discharging power control method and system of power battery and electric automobile
CN116834606A (en) * 2023-08-09 2023-10-03 力高(山东)新能源技术股份有限公司 Processing method for monomer voltage during AFE monomer acquisition disconnection
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