CN110828912B - Power battery cooling performance verification method and system - Google Patents
Power battery cooling performance verification method and system Download PDFInfo
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- CN110828912B CN110828912B CN201810915477.0A CN201810915477A CN110828912B CN 110828912 B CN110828912 B CN 110828912B CN 201810915477 A CN201810915477 A CN 201810915477A CN 110828912 B CN110828912 B CN 110828912B
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- 238000001816 cooling Methods 0.000 title claims abstract description 88
- 238000012795 verification Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000178 monomer Substances 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000000110 cooling liquid Substances 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims description 18
- 238000007600 charging Methods 0.000 claims description 12
- 238000010277 constant-current charging Methods 0.000 claims description 9
- 239000012809 cooling fluid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
-
- 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
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a method and a system for verifying cooling performance of a power battery, wherein the method comprises the steps of adjusting the charge state of the power battery to a preset charge state interval, wherein the power battery comprises at least one battery monomer; heating the power battery to reach a first threshold value, and obtaining a first temperature of each battery monomer; cooling the power battery within a preset time; when the preset time is up, acquiring a second temperature of each battery monomer of the power battery; and judging whether the cooling performance of the power battery meets the verification standard or not according to the first temperature, the second temperature and the preset time of each battery monomer. According to the invention, the power battery is heated firstly, then the power battery is cooled by using the cooling liquid, and the cooling performance of the power battery is verified according to the cooling speed of each battery monomer, so that the problems of complexity and long verification time of the existing verification method are solved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a system for verifying cooling performance of a power battery.
Background
The power battery of present volume production can divide into natural cooling, forced air cooling and liquid (water) cold three kinds according to the cooling method, and wherein the liquid cooling method has the characteristics that the cooling is fast, the difference in temperature is little, small, becomes new forms of energy passenger car power battery's mainstream scheme gradually.
Liquid cooling battery is in the charge-discharge use, and the heat that the module produced transmits to the cold water board through the heat conduction pad, is taken away rapidly by the coolant liquid of cold water inboard circulation again, and the assembly quality of whole return circuit influences the cooling effect and is vital. For example, the flatness of the cold water plate is not good, the heat conducting pad is stuck askew or wrinkled, the torque of the module fixing bolt is not enough, and the like, which can cause the local cooling of the battery.
On one hand, batteries are cooled unevenly for a long time, monomers with high temperature can accelerate aging and capacity attenuation, and the power of the batteries is reduced when the batteries are used seriously (local batteries are over-heated, and a system can only provide small power output due to protection), and on the other hand, the installation process of a battery cooling loop is complex and the effect cannot be directly visually checked, so that the cooling performance must be focused as a key ring in offline detection after the power batteries are assembled, but in the prior art, the verification mode is complex and the verification time is too long.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a system for verifying the cooling performance of a power battery, which solve the problems of complicated steps and long verification time for verifying the cooling performance of the power battery in the prior art.
The invention provides a power battery cooling performance verification method, which comprises the following steps:
adjusting the charge state of a power battery to a preset charge state interval, wherein the power battery comprises at least one battery monomer;
heating the power battery to reach a first threshold value, and obtaining a first temperature of each battery monomer;
cooling the power battery within a preset time;
when the preset time is up, acquiring a second temperature of each battery monomer of the power battery;
and judging whether the cooling performance of the power battery meets the verification standard or not according to the first temperature, the second temperature and the preset time of each battery monomer.
Further, the step of adjusting the state of charge of the power battery to a preset state of charge interval specifically comprises:
and adjusting the charge state of the power battery to a preset charge state interval through constant current charging or constant current discharging.
Further, before charging through constant current or discharging through constant current, the total voltage upper and lower limits of the power battery, the voltage upper and lower limits of the battery monomer and the temperature upper and lower limits of the battery monomer are set.
Further, the step of heating the power battery to reach the first threshold specifically includes:
calling a constant current discharge pulse and a constant current charging pulse for alternative use, and heating the power battery to reach a first threshold value; the product of the current and the discharge time of the constant current discharge pulse is equal to the product of the current and the charge time of the constant current charge pulse.
Further, the cooling the power battery within the preset time specifically includes:
and cooling the power battery by using a cooling liquid in a circulating mode continuously and circularly in a preset time through a cooling loop of the power battery.
Further, the temperature of the cooling liquid is within a preset temperature range, and the flow of the cooling liquid passing through a cooling loop of the power battery is smaller than a cooling loop flow threshold value.
Further, according to the first temperature, the second temperature and the preset time of each battery cell, judging whether the cooling performance of the power battery meets the verification standard specifically comprises:
subtracting the second temperature of each battery monomer from the first temperature of each battery monomer to obtain the temperature difference of each battery monomer;
dividing the temperature difference of each single battery by preset time to obtain the temperature difference rate of each single battery;
comparing the temperature difference rate of each battery monomer with the temperature difference rate standard;
when the temperature difference rate of any battery monomer is lower than the temperature difference rate standard, judging that the cooling performance of the power battery does not meet the verification standard; and when the temperature difference rate of any battery monomer is higher than or equal to the temperature difference rate standard, judging that the cooling performance of the power battery meets the verification standard.
The invention provides a power battery cooling performance verification system, which comprises:
the first charging and discharging unit is used for adjusting the charge state of the power battery to a preset charge state interval, and the power battery comprises at least one battery monomer;
the second charging and discharging unit is used for heating the power battery to reach a first threshold value and acquiring a first temperature of each battery monomer;
the cooling unit is used for cooling the power battery within preset time;
the measuring unit is used for acquiring a second temperature of each battery cell of the power battery when the preset time is up;
and the operation unit is used for judging whether the cooling performance of the power battery meets the verification standard or not according to the first temperature, the second temperature and the preset time of each battery monomer.
Further, the first charging and discharging unit is specifically configured to adjust the state of charge of the power battery to a preset state of charge interval through constant current charging or constant current discharging.
Furthermore, the verification system further comprises a setting unit, and the setting unit is specifically used for setting the total voltage upper and lower limits of the power battery, the voltage upper and lower limits of the battery monomer and the temperature upper and lower limits of the battery monomer.
The implementation of the invention has the following beneficial effects:
according to the method, the thermal power battery is rapidly heated through current repeated pulses, then the cooling liquid is used for cooling through the cooling loop of the thermal power battery, the cooling performance of the whole thermal power battery is judged according to the cooling efficiency of each battery monomer, the cooling performance of the thermal power battery is rapidly verified through the method, and the problems that the method for verifying the cooling performance is complex and the verification time is long in the prior art are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for verifying cooling performance of a power battery according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a power battery cooling performance verification system according to an embodiment of the present invention.
Detailed Description
The core content of the patent is that the temperature of a power battery is rapidly improved through pulses, the cooling liquid is rapidly cooled through a cooling loop of the power battery in a circulating mode, then the cooling performance of the battery is verified through the cooling speed, and the specific implementation mode of the system is further explained in combination with the attached drawings and the embodiment.
The following describes an embodiment of a method and a system for verifying cooling performance of a power battery provided by the invention in detail.
As shown in fig. 1, a method for verifying cooling performance of a power battery provided in an embodiment of the present invention includes:
s101, adjusting the state of charge of the power battery to a preset state of charge interval.
It should be noted that the power battery includes at least one battery cell, and generally includes a plurality of battery cells. The State of Charge (State of Charge) is also called residual capacity, the purpose of adjusting the residual capacity is to enable the State of Charge of the power battery to enter a preset State of Charge interval, the interval is generally 30% -70%, and the purpose of entering the preset State of Charge interval is to prepare for a subsequent heating step, so that the battery monomer is prevented from entering an overcharge or an overdischarge State.
In the charge adjustment process, the polarization and the temperature rise of the battery do not need to be considered, the target of entering the preset charge state of the charge state is wider, and the realization time of the step can be shortened by selecting larger current.
Adjusting the state of charge of the power battery to a preset state of charge interval through constant current charging or constant current discharging is one way of implementing the step S101, and can also be performed through other ways; before charging or discharging through constant current, setting the total voltage upper and lower limits of the power battery, the voltage upper and lower limits of the single battery and the temperature upper and lower limits of the single battery, and protecting the safety of the power battery.
In this embodiment, a Battery Management System (BMS) in the power Battery may detect parameters such as the state of charge of the power Battery, the temperature of each Battery cell, and the like; and the BMS reports the parameters through a CAN bus.
S102, heating the power battery to reach a first threshold value, and obtaining a first temperature of each battery monomer.
In the embodiment, the constant current discharge pulse and the constant current charge pulse are called for being used alternately, the power battery is heated to reach the first threshold value, the heating effect can be achieved by calling the constant current discharge pulse and the constant current charge pulse quickly, meanwhile, the power battery is not communicated with cooling liquid and cooling circulating water, and the first threshold value is preset.
When the power battery includes a plurality of battery cells, as long as one battery cell reaches the first threshold value, the power battery is considered to reach the first threshold value, which is set for battery safety.
In order not to cause the state of charge not to shift seriously, the product of the current and the discharge time of the constant current discharge pulse is equal to the product of the current and the charge time of the constant current charge pulse, so that the influence of charge and discharge on the state of charge is mutually counteracted.
The purpose of heavy current pulse heating is, on the one hand, improves power battery initial temperature, enlarges the cooling effect (including battery assembly difference) through the mode that increases power battery and coolant temperature difference, and on the other hand makes the battery because of the module design, arrange the direct difference in temperature that leads to such as position, and the difference in temperature (high-power water cooling) that arouses with the installation quality of follow-up cooling circuit design can more truly characterize battery thermal management ability.
The obtaining of the first temperature of each battery cell means that the temperature of each battery cell after being heated is obtained through the BMS system.
And S103, cooling the power battery within preset time.
In this embodiment, the cooling of the power battery by using the cooling liquid through the cooling loop of the power battery continuously and circularly within the preset time is a common method for implementing step S103, and the advantage of using the cooling liquid rather than water is that the cooling liquid can be used below zero, the temperature of the cooling liquid can have a larger temperature difference with the power battery, and the cooling inspection has a more obvious effect.
It should be noted that the temperature of the cooling fluid needs to be controlled within a preset temperature range, and the flow rate of the cooling fluid passing through the cooling circuit of the power battery is smaller than the flow rate threshold of the cooling circuit.
And S104, acquiring a second temperature of each battery cell of the power battery when the preset time is up.
Here, the second temperature refers to a temperature after cooling.
And S105, judging whether the cooling performance of the power battery meets the verification standard or not according to the first temperature, the second temperature and the preset time of each battery monomer.
In this embodiment, the temperature difference of each battery cell is obtained by subtracting the second temperature of each battery cell from the first temperature of each battery cell; dividing the temperature difference of each single battery by preset time to obtain the temperature difference rate of each single battery; comparing the temperature difference rate of each battery monomer with the temperature difference rate standard; when the temperature difference rate of any battery monomer is lower than the temperature difference rate standard, judging that the cooling performance of the power battery does not meet the verification standard; and when the temperature difference rate of any battery monomer is higher than or equal to the temperature difference rate standard, judging that the cooling performance of the power battery meets the verification standard.
The method is mainly used for judging whether the cooling performance of the power battery is qualified or not by comparing the efficiency of temperature reduction with the standard of temperature difference rate.
As shown in fig. 2, a power battery cooling performance verification system provided by an embodiment of the present invention includes:
the first charging and discharging unit 21 is used for adjusting the state of charge of the power battery to a preset state of charge interval, and the power battery comprises at least one battery monomer;
the second charging and discharging unit 22 is used for heating the power battery to reach a first threshold value and obtaining a first temperature of each battery monomer;
the cooling unit 23 is used for cooling the power battery within a preset time;
the measuring unit 24 is configured to obtain a second temperature of each battery cell of the power battery when the preset time is reached;
and the operation unit 25 is configured to determine whether the cooling performance of the power battery meets the verification standard according to the first temperature, the second temperature and the preset time of each battery cell.
Further, the first charging and discharging unit 21 is specifically configured to adjust the state of charge of the power battery to a preset state of charge interval through constant current charging or constant current discharging.
Furthermore, the verification system further comprises a setting unit, and the setting unit is specifically used for setting the total voltage upper and lower limits of the power battery, the voltage upper and lower limits of the battery monomer and the temperature upper and lower limits of the battery monomer.
According to the method, the batteries are rapidly heated through current repeated pulses, then the cooling liquid is used for cooling through the cooling loop of the power battery, and the cooling performance of the whole power battery is judged according to the cooling efficiency of each battery monomer.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A power battery cooling performance verification method is characterized by comprising the following steps:
adjusting the charge state of a power battery to a preset charge state interval, wherein the power battery comprises at least one battery monomer;
heating the power battery to reach a first threshold value, and obtaining a first temperature of each battery monomer;
cooling the power battery within a preset time;
when the preset time is up, acquiring a second temperature of each battery monomer of the power battery;
judging whether the cooling performance of the power battery meets the verification standard or not according to the first temperature, the second temperature and the preset time of each battery monomer;
wherein, the step of judging whether the cooling performance of the power battery meets the verification standard according to the first temperature, the second temperature and the preset time of each battery monomer specifically comprises the following steps:
subtracting the second temperature of each battery monomer from the first temperature of each battery monomer to obtain the temperature difference of each battery monomer;
dividing the temperature difference of each single battery by preset time to obtain the temperature difference rate of each single battery;
comparing the temperature difference rate of each battery monomer with the temperature difference rate standard;
when the temperature difference rate of any battery monomer is lower than the temperature difference rate standard, judging that the cooling performance of the power battery does not meet the verification standard; and when the temperature difference rate of any battery monomer is higher than or equal to the temperature difference rate standard, judging that the cooling performance of the power battery meets the verification standard.
2. The method according to claim 1, wherein the step of adjusting the state of charge of the power battery to a preset state of charge interval is specifically:
and adjusting the charge state of the power battery to a preset charge state interval through constant current charging or constant current discharging.
3. The method of claim 2, wherein the upper and lower limits of the total voltage of the power battery, the upper and lower limits of the cell voltage, and the upper and lower limits of the cell temperature are set before charging by constant current or discharging by constant current.
4. The method according to claim 1, wherein the step of heating the power cell to the first threshold value is embodied as:
calling a constant current discharge pulse and a constant current charge pulse for alternative use, and heating the power battery to reach a first threshold value; the product of the current and the discharge time of the constant current discharge pulse is equal to the product of the current and the charge time of the constant current charge pulse.
5. The method according to claim 1, wherein the cooling the power battery for the preset time is specifically:
and cooling the power battery by using a cooling liquid in a circulating mode continuously and circularly in a preset time through a cooling loop of the power battery.
6. The method of claim 5, wherein the temperature of the cooling fluid is within a predetermined temperature range, and wherein the flow rate of the cooling fluid through the cooling circuit of the power cell is less than a cooling circuit flow rate threshold.
7. A power cell cooling performance verification system, the verification system comprising:
the first charging and discharging unit is used for adjusting the charge state of the power battery to a preset charge state interval, and the power battery comprises at least one battery monomer;
the second charging and discharging unit is used for heating the power battery to reach a first threshold value and acquiring a first temperature of each battery monomer;
the cooling unit is used for cooling the power battery within preset time;
the measuring unit is used for acquiring a second temperature of each battery cell of the power battery when the preset time is up;
the operation unit is used for judging whether the cooling performance of the power battery meets the verification standard or not according to the first temperature, the second temperature and the preset time of each battery monomer;
wherein, the arithmetic unit is specifically configured to: subtracting the second temperature of each battery monomer from the first temperature of each battery monomer to obtain the temperature difference of each battery monomer; dividing the temperature difference of each single battery by preset time to obtain the temperature difference rate of each single battery; comparing the temperature difference rate of each battery monomer with the temperature difference rate standard; when the temperature difference rate of any battery monomer is lower than the temperature difference rate standard, judging that the cooling performance of the power battery does not meet the verification standard; and when the temperature difference rate of any battery monomer is higher than or equal to the temperature difference rate standard, judging that the cooling performance of the power battery meets the verification standard.
8. The verification system according to claim 7, wherein the first charging and discharging unit is specifically configured to adjust the state of charge of the power battery to a preset state of charge interval through constant current charging or constant current discharging.
9. The verification system according to claim 8, further comprising a setting unit, wherein the setting unit is specifically configured to set an upper and lower limit of a total voltage of the power battery, an upper and lower limit of a voltage of the battery cell, and an upper and lower limit of a temperature of the battery cell.
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| CN113009369B (en) * | 2021-03-18 | 2024-07-02 | 奇瑞新能源汽车股份有限公司 | Method and device for testing cycle durability of power battery |
| CN113659247A (en) * | 2021-07-29 | 2021-11-16 | 恒大新能源技术(深圳)有限公司 | Battery thermal management method and battery management system |
| CN116027208A (en) * | 2022-11-18 | 2023-04-28 | 北京双登慧峰聚能科技有限公司 | Liquid cooling energy storage battery box test platform |
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| CN102414686A (en) * | 2009-05-08 | 2012-04-11 | 美国能量变换公司 | System and method for predicting cooling performance of arrangement of devices in data center |
| CN103419652A (en) * | 2012-05-22 | 2013-12-04 | 比亚迪股份有限公司 | Electric vehicle, power system of electric vehicle and method for heating battery of electric vehicle |
| CN108284763A (en) * | 2018-01-24 | 2018-07-17 | 奇瑞汽车股份有限公司 | Battery cool-down method, device and computer readable storage medium |
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| KR101264338B1 (en) * | 2011-07-14 | 2013-05-14 | 삼성에스디아이 주식회사 | Rack housing assembly and energy storage apparatus having the same |
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|---|---|---|---|---|
| CN102414686A (en) * | 2009-05-08 | 2012-04-11 | 美国能量变换公司 | System and method for predicting cooling performance of arrangement of devices in data center |
| CN103419652A (en) * | 2012-05-22 | 2013-12-04 | 比亚迪股份有限公司 | Electric vehicle, power system of electric vehicle and method for heating battery of electric vehicle |
| CN108284763A (en) * | 2018-01-24 | 2018-07-17 | 奇瑞汽车股份有限公司 | Battery cool-down method, device and computer readable storage medium |
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Address after: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION NEW ENERGY AUTOMOBILE Co.,Ltd. Country or region after: China Address before: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: GAC AION New Energy Vehicle Co.,Ltd. Country or region before: China |
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