CN109586368B - Energy storage system starting device, starting method and energy storage system - Google Patents
Energy storage system starting device, starting method and energy storage system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 23
- 238000007599 discharging Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000000178 monomer Substances 0.000 claims 1
- 230000001960 triggered effect Effects 0.000 claims 1
- 238000011084 recovery Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H02J7/0077—
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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (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)
- Secondary Cells (AREA)
Abstract
The invention discloses an energy storage system starting device, a starting method and an energy storage system, wherein the energy storage system starting device comprises: the battery pack, a charge-discharge module and a battery management system which are connected with the battery pack, and a first switch device which is connected between the battery pack and the charge-discharge module in series. The battery management system turns on the first switching device to charge the battery pack when the battery pack is in short of power and turns off the first switching device when the battery pack abnormally operates. The invention can be safely started after the battery pack is in power failure, ensures the stable operation of the energy storage system and greatly prolongs the service life of the energy storage system.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an energy storage system starting device, an energy storage system starting method and an energy storage system.
Background
In a battery management system, overcharge and overdischarge are prevented as two important targets of battery management, but in the process of long-term cyclic use of an energy storage system, the battery is often seriously overdischarged due to the abnormality of the battery or self-discharge, and then the abnormal operation phenomenon occurs when the battery pack is charged, so that the whole battery pack cannot normally work, a load powered by the energy storage system stops operating, and the energy storage system is low in reliability and high in failure rate, and the development and application of the energy storage system are severely restricted.
Therefore, how to design an energy storage system starting device that can be safely started after the battery pack is out of power is an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides an energy storage system starting device, a starting method and an energy storage system, aiming at solving the defect that the energy storage system is easy to fail in the prior art.
The technical scheme adopted by the invention is that the starting device of the energy storage system is designed, and comprises: the battery pack, a charge-discharge module and a battery management system which are connected with the battery pack, and a first switch device which is connected between the battery pack and the charge-discharge module in series. The battery management system turns on the first switching device to charge the battery pack when the battery pack is in short of power and turns off the first switching device when the battery pack abnormally operates.
Preferably, the battery management system compares the detected voltage value of the battery pack with a preset alarm threshold value, and determines that the battery pack is in short of power when the detected voltage value is lower than the preset alarm threshold value. In an embodiment, the battery pack includes a plurality of battery cells, and the battery management system detects voltages of all the battery cells, and a minimum voltage value obtained after the comparison is a detected voltage value.
Preferably, the battery management system determines that the battery pack is abnormally operated when the battery management system detects a discharge current of the battery pack in an on state of the first switching device.
Preferably, in the on state of the first switching device, when the charging current of the battery pack is not detected within a preset detection time, it is determined that the battery pack is abnormally operated.
In one embodiment, the first switching device includes: the main positive relay is connected in series on a positive connecting line between the battery pack and the charge-discharge conversion module, and the main negative relay is connected in series on a negative connecting line between the battery pack and the charge-discharge conversion module.
Preferably, the energy storage system starting device further comprises: and the power supply circuit is connected with the battery pack and the battery management system, a second switching device connected between the battery pack and the battery management system in series is arranged in the power supply circuit, and the battery management system disconnects the second switching device when the battery pack abnormally operates.
In one embodiment, the second switching device includes: and the power supply relay is connected in series on the positive connecting line between the battery pack and the battery management system.
Preferably, the power supply circuit is further provided with a third switching device connected with the second switching device in parallel, and the third switching device is pressed to trigger the battery management system to close the second switching device.
Preferably, the third switching device includes: a cold start button connected in series on the positive connection line between the battery pack and the battery management system.
Preferably, the cold start button is in a normally open state, and when the cold start button is pressed for a time longer than a preset opening time, the battery management system is powered on to start and the second switch device is switched on.
Preferably, the power supply circuit is further provided with a power supply module connected in series between the battery pack and the battery management system.
In one embodiment, the power supply module employs a switching power supply.
In one embodiment, the charge-discharge conversion module is a DC/DC converter.
The invention also provides an energy storage system starting method, which comprises the following steps:
step 1.1, the battery management system judges whether the battery pack is in power shortage, if so, step 2.1 is executed, and if not, step 5.1 is executed;
step 2.1, the battery pack and the charge-discharge conversion module are switched on to charge the battery pack, and step 3.1 is executed;
step 3.1, the battery management system judges whether the battery pack operates abnormally, if so, the step 4.1 is executed, and if not, the step 5.1 is executed;
step 4.1, disconnecting the battery pack and stopping charging the charge-discharge conversion module;
and 5.1, normally starting the energy storage system.
Preferably, the battery management system determines that the battery pack is operating abnormally when the battery pack has a discharge current detected in step 3.1.
Preferably, in step 3.1, the battery management system detects the charging current of the battery pack when the discharging current of the battery pack is not detected, and determines that the battery pack operates abnormally if the charging current is not detected within a preset detection time.
Preferably, step 4.1 further comprises: and disconnecting a power supply circuit between the battery management system and the battery pack, and powering down the energy storage system.
Preferably, the energy storage system starting method further comprises: and step 1.0, pressing a cold start button connected in series between the battery management system and the battery pack to trigger the battery management system to start and connect a power supply circuit between the battery management system and the battery pack, and executing the step 1.1.
Preferably, the cold start button is pressed for more than a preset start time in step 1.0 to trigger the battery management system to start.
Preferably, the method for judging the battery pack power shortage in step 1.1 is as follows: the battery management system compares the detection voltage value of the battery pack with a preset alarm threshold value, and judges that the battery pack is in short of power when the detection voltage value is lower than the preset alarm threshold value.
In one embodiment, the detection voltage value is obtained by: the battery management system detects the voltages of all the single battery cells in the battery pack, and the minimum voltage value obtained after comparison is the detection voltage value.
The invention also provides an energy storage system, which comprises the energy storage system starting device.
Compared with the prior art, the method has the advantages that the battery pack is charged to carry out self-recovery starting state when the battery pack is in power failure, whether the battery pack is abnormal or not is judged according to the charging and discharging current of the battery pack in the charging process, if the battery pack is not abnormal, the energy storage system is normally started, if the battery pack is abnormal, the battery pack is immediately stopped being charged, meanwhile, the battery management system is also self-protected in power failure, the battery pack is prevented from entering more serious faults, and the safe starting of the energy storage system is effectively ensured.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of the connection of the energy storage system starting device of the present invention;
fig. 2 is a flow chart of a method for starting the energy storage system according to the present invention.
Detailed Description
As shown in fig. 1 and 2, the energy storage system starting device provided by the invention comprises: the battery management system is connected with the battery pack and the charging and discharging module, the battery management system detects the electrical parameters of the battery pack, the charging and discharging module receives a charging and discharging instruction sent by the battery management system and controls the charging current or the discharging current of the battery pack according to the instruction, and the charging and discharging conversion module can be a DC/DC converter.
A first switch device is connected in series between the battery pack and the charge-discharge module, and the battery management system is connected with the first switch device when the battery pack is in power shortage and sends a charging instruction to the charge-discharge module to charge the battery pack. In a preferred embodiment, the first switching device comprises: the battery management system is connected with the main positive relay and the main negative relay to control the main positive relay and the main negative relay to be simultaneously switched off or switched on.
The judgment method for the power shortage of the battery pack comprises the following steps: the battery management system detects and obtains a detection voltage value of the battery pack, compares the detection voltage value with a preset alarm threshold value, and judges that the battery pack is in power shortage when the detection voltage value is lower than the preset alarm threshold value. The battery pack is usually formed by combining a plurality of single battery cells, and the charging and discharging of the battery pack need to be implemented on the basic unit of the single battery cells, so that the single battery cells and the battery pack have great relevance.
The battery management system monitors the charging condition of the battery pack in the charging process of the battery pack, and disconnects the first switching device when abnormal operation is found, so that the battery pack is prevented from entering more serious faults. Preferably, the energy storage system starting device further comprises: the power supply circuit is connected with the battery pack and the battery management system, the second switch device is connected between the battery pack and the battery management system in series, the battery management system is disconnected with the second switch device when the battery pack abnormally operates, namely, the first switch device and the second switch device are both disconnected when the battery pack abnormally operates, and the whole energy storage system is self-protected in power failure, so that all components in the energy storage system are effectively protected. In a preferred embodiment, the second switching device comprises: and the power supply relay is connected in series on the positive connecting line between the battery pack and the battery management system.
The abnormal operation of the battery pack can be judged in two ways: the first is that under the on state of the first switch device, the battery management system judges the abnormal operation of the battery pack when detecting the discharge current of the battery pack; the second method is that in the on state of the first switch device, the battery management system determines that the battery pack is abnormally operated when the battery management system does not detect that the battery pack has charging current within a preset detection time, wherein the preset detection time can be 2 minutes or other time. In a preferred embodiment, the two judgment modes exist simultaneously, when the detected voltage value of the battery pack is lower than a preset alarm threshold value, the energy storage system enters a self-recovery starting logic state, the battery management system controls to close the main positive and negative relays and send a quick charging instruction to the charging and discharging module, if discharging current is detected, the main positive and negative relays and the power supply relay are immediately disconnected, the system is self-protected in power failure to prevent the system from entering a more serious fault, if the discharging current is not detected and effective charging current is not detected for a preset detection time, the system is self-protected in power failure, and only if the effective charging current is detected within the continuous preset detection time, the system enters a normal starting state. Of course, in practical application, a single judgment mode may be set.
Preferably, the power supply circuit is also provided with a third switching device connected with the second switching device in parallel, and the third switching device is pressed to trigger the battery management system to close the second switching device. In a preferred embodiment, the third switching device includes: the cold start button is in a normally open state, when the cold start button is pressed for more than preset opening time, the battery management system is powered on for a short time and then is connected with the second switch device, the battery management system supplies power independently, and the preset opening time can be 3 seconds or other times.
Further, the power supply circuit is also provided with a power supply module which is connected in series between the battery pack and the battery management system, when the battery pack is not suitable for directly supplying power to the battery management system, the power supply module converts the power supply voltage to supply power to the battery management system, in a preferred embodiment, the power supply module adopts a switch power supply, and the second switch device and the third switch device are connected in parallel on a positive connecting line between the battery pack and the switch power supply.
As shown in fig. 2, the present invention further provides a method for starting an energy storage system, including the following steps:
step 1.0, pressing a cold start button connected in series between the battery management system and the battery pack, triggering the battery management system to start and connect a power supply circuit between the battery management system and the battery pack after the cold start button is pressed for a preset starting time, and executing step 1.1;
step 1.1, the battery management system judges whether the battery pack is in power shortage, if so, step 2.1 is executed, and if not, step 5.1 is executed;
step 2.1, the battery management system is communicated with the battery pack and the charge-discharge conversion module, and sends a quick charge instruction to the charge-discharge conversion module, the charge-discharge conversion module receives the quick charge instruction sent by the battery management system, provides quick charge current for the battery pack, and executes step 3.1;
step 3.1, the battery management system judges that the battery pack operates abnormally when detecting that the battery pack has discharge current, step 4.1 is executed, the battery management system detects the charging current of the battery pack when not detecting that the battery pack has discharge current, if the charging current is not detected within preset detection time, the battery pack operates abnormally, step 4.1 is executed, and if the charging current is detected within preset detection time, step 5.1 is executed;
step 4.1, disconnecting the battery pack and the charge-discharge conversion module to stop charging, disconnecting a power supply circuit between the battery management system and the battery pack, and powering down the energy storage system;
and 5.1, normally starting the energy storage system.
The starting method of the energy storage system can be embedded in a battery management system, can automatically start, implement and automatically solve the abnormal problem, does not need external manual intervention to realize the self-rescue function of the battery pack, and has the advantages of strong adaptability, low cost, simplicity, convenience, easiness in operation and the like.
The invention also provides an energy storage system, which comprises the energy storage system starting device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (15)
1. An energy storage system starting apparatus comprising: the battery pack comprises a battery pack, a charge-discharge module and a battery management system which are connected with the battery pack, and a first switch device which is connected between the battery pack and the charge-discharge module in series, wherein the battery management system is used for switching on the first switch device to charge the battery pack when the battery pack is in power shortage, monitoring the charging condition of the battery pack in the charging process of the battery pack and switching off the first switch device when the battery pack abnormally operates;
further comprising: the power supply circuit is connected with the battery pack and the battery management system, a second switch device connected between the battery pack and the battery management system in series is arranged in the power supply circuit, and the battery management system disconnects the second switch device when the battery pack abnormally operates;
the battery management system compares the detection voltage value of the battery pack with a preset alarm threshold value, and judges that the battery pack is in power shortage when the detection voltage value is lower than the preset alarm threshold value;
and under the on state of the first switch device, when the battery management system does not detect that the battery pack has charging current within preset detection time, judging that the battery pack operates abnormally.
2. The energy storage system starting device according to claim 1, wherein the battery pack includes a plurality of battery cells, the battery management system detects voltages of all the battery cells, and a minimum voltage value obtained after the comparison is the detected voltage value.
3. The energy storage system starting device of claim 1 wherein said first switching means comprises: the charging and discharging switching module is connected with the charging and discharging battery pack in series, and the charging and discharging switching module is connected with the charging and discharging battery pack in series.
4. The energy storage system starting device of claim 1 wherein said second switching means comprises: and the power supply relay is connected in series on the positive connecting wire between the battery pack and the battery management system.
5. The energy storage system starting device according to claim 1, wherein a third switching device is further provided in the power supply circuit in parallel with the second switching device, and pressing the third switching device triggers the battery management system to turn off the second switching device.
6. The energy storage system starting device according to claim 5, wherein the third switching device comprises: a cold start button connected in series on a positive connection line between the battery pack and the battery management system.
7. The energy storage system starting device according to claim 6, wherein the cold start button is normally open, and when the cold start button is pressed for more than a preset on time, the battery management system is powered on and turns on the second switch device.
8. The energy storage system starting device according to claim 1, wherein a power supply module is further provided in the power supply circuit and connected in series between the battery pack and the battery management system.
9. The energy storage system starting device according to claim 8, wherein the power supply module employs a switching power supply.
10. The energy storage system starting device according to claim 1, wherein the charge-discharge conversion module is a DC/DC converter.
11. An energy storage system starting method is characterized by comprising the following steps:
step 1.1, the battery management system judges whether the battery pack is in power shortage, if so, step 2.1 is executed, and if not, step 5.1 is executed;
step 2.1, the battery pack and the charge-discharge conversion module are switched on to charge the battery pack, and step 3.1 is executed;
step 3.1, the battery management system judges whether the battery pack operates abnormally, if so, the step 4.1 is executed, and if not, the step 5.1 is executed;
step 4.1, disconnecting the battery pack and the charge-discharge conversion module to stop charging, disconnecting a power supply circuit between the battery management system and the battery pack, and powering down the energy storage system;
step 5.1, normally starting the energy storage system;
the judgment mode of the battery pack power shortage in the step 1.1 is as follows: the battery management system compares the detection voltage value of the battery pack with a preset alarm threshold value, and judges that the battery pack is in power shortage when the detection voltage value is lower than the preset alarm threshold value;
in the step 3.1, the battery management system detects the charging current of the battery pack when the discharging current of the battery pack is not detected, and if the charging current is not detected within the preset detection time, the battery pack is judged to be in abnormal operation.
12. The energy storage system starting method according to claim 11, further comprising: and step 1.0, pressing a cold start button connected in series between the battery management system and the battery pack to trigger the battery management system to start and connect a power supply circuit between the battery management system and the battery pack, and executing the step 1.1.
13. The energy storage system starting method according to claim 12, wherein the battery management system is triggered to start after the cold start button is pressed for more than a preset start time in step 1.0.
14. The energy storage system starting method according to claim 11, wherein the detection voltage value is obtained by: and the battery management system detects the voltages of all the monomer battery cores in the battery pack, and the minimum voltage value obtained after comparison is the detection voltage value.
15. An energy storage system, comprising: the energy storage system starting device according to any one of claims 1 to 10.
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| CN111313491A (en) * | 2019-11-12 | 2020-06-19 | 珠海格力电器股份有限公司 | Control method and device of energy storage system and power supply control circuit |
| CN111541226A (en) * | 2020-05-11 | 2020-08-14 | 上海空间电源研究所 | Overcharge-preventing control method for lithium ion storage battery for space |
| CN118566769A (en) * | 2024-07-31 | 2024-08-30 | 深圳市佳维恒信科技有限公司 | Method, system, equipment and medium for testing cold start current of vehicle-mounted storage battery |
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