CN116053643A - Power battery system heat management method - Google Patents
Power battery system heat management method Download PDFInfo
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- CN116053643A CN116053643A CN202211728168.5A CN202211728168A CN116053643A CN 116053643 A CN116053643 A CN 116053643A CN 202211728168 A CN202211728168 A CN 202211728168A CN 116053643 A CN116053643 A CN 116053643A
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- temperature
- battery
- management system
- request strategy
- power
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of lithium ion battery systems for electric vehicles, in particular to a power battery system thermal management method, which comprises the following steps that a battery management system judges whether a vehicle is in a driving state or not; the battery management system monitors the temperature of the battery cell in real time; if the battery management system monitors that the temperature of the battery cell reaches a first preset condition, a cooling request strategy is started; if the battery management system monitors that the temperature of the battery cell reaches a second preset condition, the battery management system starts a temperature equalization request strategy, and the battery cell temperature detected by the power battery management system in real time and the power requirement of the driving working condition are subjected to temperature balance, and flow control is performed on different temperature points, so that the use reliability of the power battery system is improved, the potential safety hazard caused by the temperature is corrected, and the performance of the power battery system is effectively improved.
Description
Technical Field
The invention relates to the technical field of lithium ion battery systems for electric automobiles, in particular to a thermal management method of a power battery system.
Background
Electric vehicles are favored by more and more people because of low noise, no pollution, multiple energy sources and high energy efficiency, and are also a development trend of automobiles in the future. The power battery system is a power source of the electric automobile, is an energy storage device, and in the use process of the battery, the temperature management of the power battery system is related to the use time of the power battery system, and the power battery system can provide an optimal working environment and working state so as to facilitate the implementation of various instructions of the battery management system and cope with complex use conditions in the whole automobile environment. In the conventional EV and HEV working conditions, natural cooling and air cooling are used as a low-cost cooling mode choice.
The good power battery using temperature for the hybrid electric vehicle is the basis for ensuring that the power battery can be charged and discharged normally in the working range, is the premise of prolonging the service life of the battery, optimizing the driving working condition and ensuring the energy using efficiency of the electric vehicle, and therefore, a precise temperature control method and a control strategy are of great importance.
Disclosure of Invention
Accordingly, the present invention is directed to a thermal management method for a power battery system, so as to provide a precise temperature control method and control strategy.
Based on the above object, the present invention provides a thermal management method for a power battery system, comprising the steps of:
the battery management system judges whether the vehicle is in a driving state or not;
the battery management system monitors the temperature of the battery cell in real time;
if the battery management system monitors that the temperature of the battery cell reaches a first preset condition, a cooling request strategy is started;
and if the battery management system monitors that the temperature of the battery cell reaches a second preset condition, the battery management system starts a temperature equalization request strategy.
Optionally, the priority of the cooling request policy is higher than that of the temperature equalization request policy, and after the cooling process is executed, the cooling request policy is triggered, and then the temperature equalization request policy is responded, and if the cooling condition is reached, the cooling request policy is started immediately.
Optionally, the first preset condition is that the highest cell temperature is more than or equal to 40 ℃.
Optionally, the second preset condition is that the highest cell temperature is not less than 38 ℃ and/or the difference between the highest cell temperature and the lowest cell temperature is not less than 5 ℃.
Optionally, the cooling request strategy and the temperature equalization request strategy are both water-cooling, the water temperature of the cooling request strategy is lower than that of the temperature equalization request strategy, and the flow rate of the cooling request strategy is higher than that of the temperature request strategy.
Optionally, when the power mode of the vehicle is a pure electric mode or the power mode of the vehicle is hybrid and the residual electric quantity of the vehicle is more than or equal to 35%, the vehicle is judged to be in a driving state.
The invention has the beneficial effects that: through carrying out temperature balance to the power demand of battery cell temperature and driving operating mode that power battery management system detected in real time, through carrying out flow control to different temperature points, this kind of method has promoted power battery system reliability in use, has revised the potential safety hazard because of the temperature brings, has effectively promoted power battery system's performance.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method of thermal management of a power cell system;
fig. 2 is a list of control signals required for various stages in the execution of the power battery system thermal management method.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Example 1
As shown in fig. 1 and 2, a thermal management method of a power battery system includes:
the battery management system judges the state of the vehicle, and judges that the vehicle is in a driving state when the power mode of the vehicle is a pure electric mode or the power mode of the vehicle is mixed and the residual electric quantity of the vehicle is more than or equal to 35 percent, and the battery management system monitors the temperature of the battery cell in real time;
when the highest cell temperature is more than or equal to 45 ℃, a corresponding cooling request strategy is started, 0x2 instruction is executed by a thermal management request, the flow rate is requested for 12L/min, and the effective value of the water inlet temperature is 18;
example two
As shown in fig. 1 and 2, a power battery system thermal management method includes:
the battery management system judges the state of the vehicle, and judges that the vehicle is in a driving state when the power mode of the vehicle is a pure electric mode or the power mode of the vehicle is mixed and the residual electric quantity of the vehicle is more than or equal to 35 percent, and the battery management system monitors the temperature of the battery cell in real time;
when the highest cell temperature is more than or equal to 42 ℃, a corresponding cooling request strategy is started, 0x2 instruction is executed by a thermal management request, the flow rate is 10L/min, and the effective value of the water inlet temperature is 20;
example III
As shown in fig. 1 and 2, a power battery system thermal management method includes:
the battery management system judges the state of the vehicle, and judges that the vehicle is in a driving state when the power mode of the vehicle is a pure electric mode or the power mode of the vehicle is mixed and the residual electric quantity of the vehicle is more than or equal to 35 percent, and the battery management system monitors the temperature of the battery cell in real time;
when the temperature of the highest battery cell is more than or equal to 40 ℃, a corresponding cooling request strategy is started, a 0x2 instruction is executed by a thermal management request, the flow rate is 10L/min, the effective value of the water inlet temperature is 25, when the temperature of the highest battery cell is less than or equal to 36 ℃, the 0x2 instruction is executed by the thermal management request, the flow rate is 10L/min, and when the temperature difference between the temperature of the highest battery cell and the temperature of the lowest battery cell is less than or equal to 2 ℃, the 0x0 instruction is executed by the thermal management request, and the flow rate is 0L/min;
example IV
As shown in fig. 1 and 2, a thermal management method of a power battery system includes:
the battery management system judges the state of the vehicle, and judges that the vehicle is in a driving state when the power mode of the vehicle is a pure electric mode or the power mode of the vehicle is mixed and the residual electric quantity of the vehicle is more than or equal to 35 percent, and the battery management system monitors the temperature of the battery cell in real time;
when the temperature of the highest battery cell is more than or equal to 38 ℃ and the temperature difference between the highest battery cell temperature and the lowest battery cell temperature is less than or equal to 5 ℃, a temperature equalization request strategy is started, a thermal management request executes a 0x2 instruction, the flow rate is requested to be 10L/min, and when the temperature of the highest battery cell is less than or equal to 36 ℃ or the temperature difference between the highest battery cell temperature and the lowest battery cell temperature is less than or equal to 2 ℃, the thermal management request executes a 0x0 instruction, and the flow rate is requested to be 0L/min.
In the above embodiment, the priority of the cooling request policy is higher than that of the temperature equalization request policy, and after the cooling process is performed, the temperature equalization request policy is triggered after the cooling request policy is triggered, and if the cooling condition is reached, the cooling request policy is immediately started.
According to the invention, the temperature of the battery cell detected by the power battery management system in real time and the power requirement of the driving working condition are balanced, and the use reliability of the power battery system is improved, the potential safety hazard caused by the temperature is corrected, and the performance of the power battery system is effectively improved by controlling the flow of different temperature points.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method of thermal management of a power battery system, comprising the steps of:
the battery management system judges whether the vehicle is in a driving state or not;
the battery management system monitors the temperature of the battery cell in real time;
if the battery management system monitors that the temperature of the battery cell reaches a first preset condition, a cooling request strategy is started;
and if the battery management system monitors that the temperature of the battery cell reaches a second preset condition, the battery management system starts a temperature equalization request strategy.
2. The thermal management method of a power battery system according to claim 1, wherein the priority of the cooling request strategy is higher than that of the temperature equalization request strategy, and the cooling request strategy is started immediately if the cooling condition is reached when the temperature equalization request strategy is triggered in response to the temperature equalization request strategy after the cooling process is completed.
3. The method of claim 1, wherein the first predetermined condition is a maximum cell temperature of at least 40 ℃.
4. The method of claim 1, wherein the second predetermined condition is that the maximum cell temperature is equal to or greater than 38 ℃ and/or the difference between the maximum cell temperature and the minimum cell temperature is equal to or greater than 5 ℃.
5. The power battery system thermal management method according to claim 1, wherein the cooling request strategy and the temperature equalization request strategy are both water-cooled, the water temperature of the cooling request strategy is lower than the water temperature of the temperature equalization request strategy, and the flow rate of the cooling request strategy is higher than the flow rate of the temperature request strategy.
6. The method according to claim 1, wherein the vehicle is determined to be in a driving state when the power mode of the vehicle is a pure power mode or the power mode of the vehicle is a hybrid and the remaining amount of power of the vehicle is not less than 35%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211728168.5A CN116053643A (en) | 2022-12-30 | 2022-12-30 | Power battery system heat management method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211728168.5A CN116053643A (en) | 2022-12-30 | 2022-12-30 | Power battery system heat management method |
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| Publication Number | Publication Date |
|---|---|
| CN116053643A true CN116053643A (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211728168.5A Pending CN116053643A (en) | 2022-12-30 | 2022-12-30 | Power battery system heat management method |
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| CN (1) | CN116053643A (en) |
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- 2022-12-30 CN CN202211728168.5A patent/CN116053643A/en active Pending
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