CN114883699A - Thermal management method, system, device and storage medium for battery stack - Google Patents

Abstract

The invention provides a thermal management method, a system, equipment and a storage medium of a battery stack, wherein one battery stack comprises a plurality of battery cells, and the thermal management method comprises the following steps: acquiring an ambient temperature and a maximum cell temperature difference; and determining a temperature adjusting mode according to the environment temperature and the maximum cell temperature difference. The invention adopts accurate thermal management control logic, takes the environmental temperature of the battery stack and the maximum battery cell temperature difference in the stack as main control parameters, intelligently determines a temperature adjusting mode, and transfers the air conditioner to be mutually switched among a refrigeration mode, a heating mode, a ventilation mode and the like, and the air conditioner is linked with a battery plug box fan (if any) in two stages under the running state of each mode, controls the battery plug box fan in a grading and time-sharing manner, ensures the consistency of the high temperature and the temperature of the battery cell to be controlled in the optimal index, thereby improving the efficiency of the temperature adjusting system and prolonging the service life of the system.

Description

Thermal management method, system, device and storage medium for battery stack

technical field

The present invention relates to the technical field of energy storage power stations, and in particular, to a thermal management method, system, device and storage medium for a battery stack.

Background technique

At present, there are basically two methods for thermal management control systems of energy storage power stations in the industry:

(1) Control the working mode of the air conditioner according to the return air temperature of the air conditioner as the ambient temperature of the power station. This method only controls the ambient temperature in the power station and cannot truly and accurately reflect the cell temperature.

(2) The air conditioning mode is controlled according to the highest value or average temperature of the battery temperature collection point. Although this method considers the cell temperature, it does not consider the temperature difference of the cells in the stack, which cannot guarantee the system consistency and thus affects the system efficiency. and lifespan.

The above two thermal management methods have their own disadvantages.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a thermal management method, system, device and storage medium for a battery stack in order to overcome the shortcomings of the above two thermal management methods in the prior art.

The present invention solves the above-mentioned technical problems through the following technical solutions:

The present invention provides a thermal management method for a battery stack, wherein a battery stack includes a plurality of cells, and the thermal management method includes:

Obtain the ambient temperature and the maximum cell temperature difference;

The temperature adjustment mode is determined according to the ambient temperature and the maximum cell temperature difference.

Preferably, determining the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference includes:

the corresponding relationship between the preset ambient temperature range and the temperature difference range and the temperature adjustment mode;

The temperature adjustment mode is determined according to the ambient temperature, the maximum cell temperature difference and the corresponding relationship.

Preferably, determining the temperature adjustment mode according to the ambient temperature, the maximum cell temperature difference and the corresponding relationship includes:

Determine the ambient temperature range to which it belongs according to the ambient temperature;

Determine the corresponding candidate temperature adjustment mode according to the ambient temperature range to which it belongs;

The corresponding temperature adjustment mode is determined from the candidate temperature adjustment modes according to the maximum cell temperature difference.

Preferably, the ambient temperature range includes a minimum temperature range and a maximum temperature range, and the minimum threshold value of the maximum temperature range is greater than the maximum threshold value of the minimum temperature range;

If the ambient temperature range to which the ambient temperature belongs is the lowest temperature range, the corresponding candidate temperature adjustment mode is determined to be the low temperature heating mode; or, if the ambient temperature range to which the ambient temperature belongs is the highest temperature range, Then, it is determined that the corresponding candidate temperature adjustment mode is the high temperature cooling mode.

Preferably, the thermal management method further includes:

If the working duration of the current temperature regulation mode reaches the preset temperature return difference duration, the temperature regulation mode is re-determined, and the re-determined temperature regulation mode is the one corresponding to the higher temperature range of the current temperature regulation mode. The temperature mode or the temperature adjustment mode corresponding to the lower temperature range of the current temperature adjustment mode.

Preferably, the ambient temperature is the highest cell temperature in the battery stack, or the ambient temperature is the average cell temperature in the battery stack.

Preferably, the temperature adjustment mode includes an air conditioner temperature adjustment mode and a battery insert box fan temperature adjustment mode.

The present invention also provides a thermal management system for a battery stack, wherein a battery stack includes a plurality of cells, and the thermal management system includes: an acquisition module and a temperature regulation module;

The obtaining module is used to obtain the ambient temperature and the maximum cell temperature difference;

The temperature adjustment module is configured to determine a temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference.

Preferably, the temperature regulation module includes: a preset unit and a temperature regulation unit;

The preset unit is used to preset the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode;

The temperature adjustment unit is configured to determine the temperature adjustment mode according to the ambient temperature, the maximum cell temperature difference and the corresponding relationship.

Preferably, the temperature adjustment unit includes: an ambient temperature subunit, a candidate temperature adjustment subunit, and a determined temperature adjustment subunit;

The ambient temperature subunit is used to determine the ambient temperature range to which it belongs according to the ambient temperature;

The candidate temperature adjustment subunit is configured to determine a corresponding candidate temperature adjustment mode according to the ambient temperature range to which it belongs;

The temperature determination subunit is configured to determine the corresponding temperature adjustment mode from the candidate temperature adjustment modes according to the maximum cell temperature difference.

Preferably, the ambient temperature range includes a minimum temperature range and a maximum temperature range, and the minimum threshold value of the maximum temperature range is greater than the maximum threshold value of the minimum temperature range;

The candidate temperature adjustment subunit is specifically configured to determine that the corresponding candidate temperature adjustment mode is the low temperature heating mode if the ambient temperature range to which the ambient temperature belongs is the lowest temperature range; or, the candidate temperature adjustment subunit is specifically used for: If the ambient temperature range to which the ambient temperature belongs is the highest temperature range, it is determined that the corresponding candidate temperature adjustment mode is the high temperature cooling mode.

Preferably, the temperature regulation module is specifically configured to re-determine the temperature regulation mode if the working duration of the current temperature regulation mode reaches a preset temperature return difference duration, and the re-determined temperature regulation mode is the current temperature regulation mode. The temperature adjustment mode corresponding to the higher temperature range of the temperature adjustment mode or the temperature adjustment mode corresponding to the lower temperature range of the current temperature adjustment mode.

Preferably, the ambient temperature is the highest cell temperature in the battery stack, or the ambient temperature is the average cell temperature in the battery stack.

Preferably, the temperature adjustment mode includes an air conditioner temperature adjustment mode and a battery insert box fan temperature adjustment mode.

The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, the processor implementing the aforementioned thermal management method for a battery stack when the processor executes the computer program.

The present invention also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the aforementioned thermal management method for a battery stack.

The positive improvement effect of the present invention lies in: adopting precise thermal management control logic, using the ambient temperature of the battery stack and the maximum cell temperature difference in the stack as the main control parameters, intelligently determining the temperature adjustment mode, and mobilizing the air conditioner in the cooling mode, heating mode, ventilation mode Switch between modes, etc., and link with the battery box fan (if any) in two-level operation state, and control the battery box fan in different stages and time-sharing to ensure that the high temperature and temperature consistency of the battery cells are controlled within the optimal indicators. Thereby, the efficiency of the temperature regulation system is improved and the service life of the system is prolonged.

Description of drawings

FIG. 1 is a flowchart of a thermal management method for a battery stack according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart of a specific embodiment of step S12 in the thermal management method of the battery stack according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart of a specific embodiment of step S122 in the thermal management method of the battery stack according to Embodiment 1 of the present invention.

FIG. 4 is a schematic block diagram of a thermal management system of a battery stack according to Embodiment 2 of the present invention.

FIG. 5 is a schematic structural diagram of an electronic device according to Embodiment 3 of the present invention.

Detailed ways

The present invention is further described below by way of examples, but the present invention is not limited to the scope of the described examples.

Example 1

This embodiment provides a thermal management method for a battery stack. A battery stack includes several cells. Referring to FIG. 1 , the thermal management method includes:

S11. Obtain the ambient temperature and the maximum cell temperature difference.

S12. Determine the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference.

The ambient temperature is the ambient temperature of the battery stack, and the maximum cell temperature difference is the maximum temperature difference between the cell temperatures of the battery stack.

The temperature adjustment mode can be switched between cooling mode, heating mode, ventilation mode, etc.

In this embodiment, precise thermal management control logic is adopted, and the ambient temperature of the battery stack and the maximum cell temperature difference in the stack are used as the main control parameters to intelligently determine the temperature adjustment mode. The temperature adjustment mode can be in cooling mode, heating mode, ventilation mode It can be switched between the two to ensure that the high temperature and temperature consistency of the cell are controlled within the optimal index, thereby improving the efficiency of the temperature regulation system and prolonging the service life of the system.

During specific implementation, referring to FIG. 2 , step S12 includes:

S121 , preset the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode.

S122: Determine the temperature adjustment mode according to the ambient temperature, the maximum cell temperature difference and the corresponding relationship.

Among them, the ambient temperature range to which the ambient temperature belongs and the temperature difference range to which the maximum cell temperature difference belongs determine the specific temperature adjustment mode.

Example 1 of the correspondence between the ambient temperature range and the temperature difference range and the temperature control mode is shown in the table below.

Ambient temperature range temperature range Temperature adjustment mode Ambient temperature range1 - Temp mode 1 Ambient temperature range 2 temperature range 1 Temp mode 1 Ambient temperature range 2 temperature range 2 Temp mode 2 Ambient temperature range 3 temperature range 1 Temp mode 2 Ambient temperature range 3 temperature range 2 Temp mode 3 ... ... ... Ambient temperature rangeN - Temp mode N

In this example, the ambient temperature range divides the possible temperature range from low to high into N sub-regions, where N is an integer greater than 2; since the temperature difference range of the cells in the battery stack is smaller than the ambient temperature range, The temperature difference range divides the possible temperature difference range from low to high into two sub-regions, and in some cases, the temperature difference range may not be considered (that is, corresponding to any temperature difference range).

It can be understood that the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode is not limited to this example, and the corresponding relationship can be set according to actual needs.

In this embodiment, a specific implementation of determining the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference is provided.

During specific implementation, referring to FIG. 3 , step S122 includes:

S1221. Determine the ambient temperature range to which it belongs according to the ambient temperature.

S1222. Determine a corresponding candidate temperature adjustment mode according to the ambient temperature range to which it belongs.

S1223: Determine a corresponding temperature adjustment mode from the candidate temperature adjustment modes according to the maximum cell temperature difference.

Among them, since the number of segments in the ambient temperature range may be more than the number of segments in the temperature difference range, the number of temperature adjustment modes corresponding to the same ambient temperature range may be far less than the number of temperature adjustment modes corresponding to the same temperature difference range. The corresponding candidate temperature adjustment mode is determined according to the ambient temperature range to which it belongs, and then the temperature adjustment mode is determined according to the temperature difference range to which the maximum cell temperature difference belongs. In this way, the temperature adjustment mode can be determined more quickly, the reaction speed of the thermal management of the battery stack is improved, and the temperature adjustment efficiency is improved.

During specific implementation, the ambient temperature range includes the lowest temperature range and the highest temperature range, and the minimum threshold value of the highest temperature range is greater than the maximum threshold value of the lowest temperature range.

In one embodiment, step S1222 includes:

If the ambient temperature range to which the ambient temperature belongs is the lowest temperature range, it is determined that the corresponding candidate temperature adjustment mode is the low temperature heating mode.

The lowest temperature range is the lowest temperature range of the cells allowed by the power station system, for example, the ambient temperature range 1 in Example 1. When the ambient temperature range to which the ambient temperature belongs is the lowest temperature range, in order to ensure system safety and work efficiency, the corresponding candidate temperature adjustment mode is directly determined to be the low temperature heating mode without considering the temperature difference of the cells. Since the candidate temperature adjustment mode is unique , that is, it is determined that the temperature adjustment mode is the low temperature heating mode.

In one embodiment, step S1222 includes:

If the ambient temperature range to which the ambient temperature belongs is the highest temperature range, it is determined that the corresponding candidate temperature adjustment mode is the high temperature cooling mode.

The maximum temperature range is the maximum temperature range of the cells allowed by the power station system, such as the ambient temperature range N in Example 1. When the ambient temperature range to which the ambient temperature belongs is the highest temperature range, in order to ensure system safety and work efficiency, the corresponding candidate temperature adjustment mode is directly determined to be the high temperature cooling mode without considering the temperature difference of the cells. Since the candidate temperature adjustment mode is unique, That is, it is determined that the temperature adjustment mode is the high temperature cooling mode.

When specifically implemented, the thermal management method further includes:

If the working time of the current temperature adjustment mode reaches the preset temperature return difference time, the temperature adjustment mode is re-determined, and the re-determined temperature adjustment mode is the temperature adjustment mode corresponding to the higher temperature range of the current temperature adjustment mode or the current temperature adjustment mode The temperature adjustment mode corresponding to the lower one-stage temperature range of the mode.

The purpose of setting the temperature hysteresis time is to prevent the temperature regulation system from frequently switching modes, which may lead to instability of the temperature regulation system and damage to hardware such as air conditioners.

In this embodiment, the re-determined temperature adjustment mode may be the current temperature adjustment mode, that is, it remains unchanged.

The re-determined temperature adjustment mode may also be a temperature adjustment mode corresponding to a higher temperature range of the current temperature adjustment mode, or may be a temperature adjustment mode corresponding to a lower temperature range of the current temperature adjustment mode. In this case, taking example 1 as an example, assuming that the current temperature adjustment mode is temperature adjustment mode 2, the re-determined temperature adjustment mode can be temperature adjustment mode 1 or temperature adjustment mode 3, and cross-level adjustment is not possible For the temperature control mode 4-N.

During specific implementation, the ambient temperature may be obtained by calculating the temperatures of multiple cells collected by a BMS (Battery Management System, battery management system) system.

In one embodiment, the ambient temperature is the highest cell temperature within the battery stack.

In one embodiment, the ambient temperature is the average cell temperature within the battery stack.

Among them, the calculation method of the ambient temperature can be selected according to actual needs.

In this embodiment, two specific implementations of obtaining the ambient temperature through multiple cell temperatures are provided.

During specific implementation, the temperature adjustment mode includes an air conditioner temperature adjustment mode and a battery insert box fan temperature adjustment mode.

The air-conditioning temperature adjustment mode may include multiple air-conditioning execution modes (including air ducts), and the air-conditioning execution modes include but are not limited to the air-conditioning forced heating mode, the air-conditioning ventilation mode, the air-conditioning step heat mode, the air-conditioning step cooling mode, and the air-conditioning forced cooling mode. model.

The battery box fan tempering mode can also include multiple fan execution modes.

The air conditioning execution mode and the fan execution mode can be combined to form the temperature regulation mode. For example, the air conditioner forced cooling mode can be combined with the strongest fan execution mode to form a low temperature heating mode, then the temperature adjustment mode is low temperature heating mode, which means that the air conditioner is in the air conditioner forced cooling mode and the battery box fan is in the strongest fan execution mode .

The temperature adjustment mode can mobilize the air conditioner to switch between cooling mode, heating mode, ventilation mode, etc., and can also mobilize the battery box fan to switch between multiple fan execution modes.

In this embodiment, the precise thermal management control logic is adopted, and the ambient temperature of the battery stack and the maximum cell temperature difference in the stack are used as the main control parameters to intelligently determine the temperature adjustment mode, and mobilize the air conditioner in the cooling mode, heating mode, ventilation mode, etc. Switches between the two modes, and is linked with the battery box fan (if any) in two-stage operation in each mode, and controls the battery box fan in stages and time-sharing to ensure that the high temperature and temperature consistency of the battery cells are controlled within the optimal indicators, thereby increasing the temperature. Adjust the efficiency of the system and prolong the service life of the system.

The following is an example of implementing the thermal management method of the battery stack to adjust the temperature, wherein the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode is set to the corresponding relationship in Example 1, and the ambient temperature is the highest cell temperature in the battery stack. .

The BMS system of the power station collects the temperature of multiple cells in the battery stack in real time, calculates the ambient temperature based on the cell temperature, and determines the ambient temperature range to which the ambient temperature belongs. The temperature range is ambient temperature range 2), and the corresponding candidate temperature adjustment modes include temperature adjustment mode 1 and temperature adjustment mode 2. Then determine the temperature difference range to which the maximum cell temperature difference in the stack belongs. Assuming that the maximum cell temperature difference is within temperature difference range 1 (that is, the temperature difference range to which the maximum cell temperature difference belongs is temperature difference range 1), you can select the candidate temperature adjustment mode from the temperature difference range. Make sure that the temperature adjustment mode is temperature adjustment mode 1.

During the temperature adjustment process, the cell temperature changes, resulting in changes in the ambient temperature and the maximum cell temperature difference. If the ambient temperature is still within the ambient temperature range 2, the corresponding candidate temperature adjustment mode remains unchanged, and the maximum cell temperature difference expands to the temperature difference. Within the range 2 and the working time satisfies the temperature hysteresis time, the temperature adjustment mode is switched from the temperature adjustment mode 1 to the temperature adjustment mode 2.

Similarly, after the temperature adjustment mode is switched to the temperature adjustment mode 2, the ambient temperature is still within the ambient temperature range 2, and the corresponding candidate temperature adjustment mode remains unchanged. If the maximum cell temperature difference is reduced to the temperature difference range 1 and the working time meets the temperature return If the difference time is longer, the temperature adjustment mode is switched from the temperature adjustment mode 2 to the temperature adjustment mode 1.

During the working process, if the ambient temperature range to which the ambient temperature belongs rises from ambient temperature range 2 to ambient temperature range 3, the corresponding candidate temperature adjustment modes include temperature adjustment mode 2 and temperature adjustment mode 3. Then determine the temperature adjustment mode according to the maximum cell temperature difference.

A domestic project that has been put into operation has adopted the thermal management method of the battery stack. Under the same air-conditioning hardware and air duct structure configuration, the ambient temperature (which is the highest cell temperature in the battery stack) and the maximum cell temperature difference in the battery stack From 42°C (degree Celsius)/18°C before adopting this thermal management method to the current 38°C/10°C, the precise temperature adjustment effect is remarkable.

Example 2

This embodiment provides a thermal management system for a battery stack. A battery stack includes several cells. Referring to FIG. 4 , the thermal management system includes an acquisition module 1 and a temperature adjustment module 2 .

The acquisition module 1 is used to acquire the ambient temperature and the maximum cell temperature difference.

The temperature adjustment module 2 is used to determine the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference.

The ambient temperature is the ambient temperature of the battery stack, and the maximum cell temperature difference is the maximum temperature difference between the cell temperatures of the battery stack.

The temperature adjustment mode can be switched between cooling mode, heating mode, ventilation mode, etc.

In this embodiment, precise thermal management control logic is adopted, and the ambient temperature of the battery stack and the maximum cell temperature difference in the stack are used as the main control parameters to intelligently determine the temperature adjustment mode. The temperature adjustment mode can be in cooling mode, heating mode, ventilation mode It can be switched between the two to ensure that the high temperature and temperature consistency of the cell are controlled within the optimal index, thereby improving the efficiency of the temperature regulation system and prolonging the service life of the system.

During specific implementation, the temperature adjustment module 2 includes: a preset unit 21 and a temperature adjustment unit 22 .

The preset unit 21 is used to preset the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode.

The temperature adjustment unit 22 is configured to determine the temperature adjustment mode according to the ambient temperature, the maximum cell temperature difference and the corresponding relationship.

Among them, the ambient temperature range to which the ambient temperature belongs and the temperature difference range to which the maximum cell temperature difference belongs determine the specific temperature adjustment mode.

Example 2 of the correspondence between the ambient temperature range and the temperature difference range and the temperature adjustment mode is shown in the table below.

In this example, the ambient temperature range divides the possible temperature range from low to high into N sub-regions, where N is an integer greater than 2; since the temperature difference range of the cells in the battery stack is smaller than the ambient temperature range, The temperature difference range divides the possible temperature difference range from low to high into two sub-regions, and in some cases, the temperature difference range may not be considered (that is, corresponding to any temperature difference range).

It can be understood that the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode is not limited to this example, and the corresponding relationship can be set according to actual needs.

In this embodiment, a specific implementation of determining the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference is provided.

During specific implementation, the temperature adjustment unit 22 includes: an ambient temperature subunit 221 , a candidate temperature adjustment subunit 222 and a determination temperature adjustment subunit 223 .

The ambient temperature subunit 221 is used to determine the ambient temperature range to which it belongs according to the ambient temperature.

The candidate temperature adjustment subunit 222 is configured to determine a corresponding candidate temperature adjustment mode according to the ambient temperature range to which it belongs.

The determining temperature adjustment subunit 223 is configured to determine the corresponding temperature adjustment mode from the candidate temperature adjustment modes according to the maximum cell temperature difference.

Among them, since the number of segments in the ambient temperature range may be more than the number of segments in the temperature difference range, the number of temperature adjustment modes corresponding to the same ambient temperature range may be far less than the number of temperature adjustment modes corresponding to the same temperature difference range. The corresponding candidate temperature adjustment mode is determined according to the ambient temperature range to which it belongs, and then the temperature adjustment mode is determined according to the temperature difference range to which the maximum cell temperature difference belongs. In this way, the temperature adjustment mode can be determined more quickly, the reaction speed of the thermal management of the battery stack is improved, and the temperature adjustment efficiency is improved.

During specific implementation, the ambient temperature range includes the lowest temperature range and the highest temperature range, and the minimum threshold value of the highest temperature range is greater than the maximum threshold value of the lowest temperature range.

In one embodiment, the candidate temperature adjustment subunit 222 is specifically configured to determine that the corresponding candidate temperature adjustment mode is the low temperature heating mode if the ambient temperature range to which the ambient temperature belongs is the lowest temperature range.

The lowest temperature range is the lowest temperature range of cells allowed by the power station system, such as ambient temperature range 1 in Example 2. When the ambient temperature range to which the ambient temperature belongs is the lowest temperature range, in order to ensure system safety and work efficiency, the corresponding candidate temperature adjustment mode is directly determined to be the low temperature heating mode without considering the temperature difference of the cells. Since the candidate temperature adjustment mode is unique , that is, it is determined that the temperature adjustment mode is the low temperature heating mode.

In one embodiment, the candidate temperature adjustment subunit 222 is specifically configured to determine that the corresponding candidate temperature adjustment mode is the high temperature cooling mode if the ambient temperature range to which the ambient temperature belongs is the highest temperature range.

The maximum temperature range is the maximum temperature range of the cells allowed by the power station system, such as the ambient temperature range N in Example 2. When the ambient temperature range to which the ambient temperature belongs is the highest temperature range, in order to ensure system safety and work efficiency, the corresponding candidate temperature adjustment mode is directly determined to be the high temperature cooling mode without considering the temperature difference of the cells. Since the candidate temperature adjustment mode is unique, That is, it is determined that the temperature adjustment mode is the high temperature cooling mode.

During specific implementation, the temperature adjustment module 2 is specifically configured to re-determine the temperature adjustment mode if the working time of the current temperature adjustment mode reaches the preset temperature return difference time, and the re-determined temperature adjustment mode is one level higher than the current temperature adjustment mode The temperature adjustment mode corresponding to the temperature range or the temperature adjustment mode corresponding to the lower temperature range of the current temperature adjustment mode.

The purpose of setting the temperature hysteresis time is to prevent the temperature regulation system from frequently switching modes, which may lead to instability of the temperature regulation system and damage to hardware such as air conditioners.

In this embodiment, the re-determined temperature adjustment mode may be the current temperature adjustment mode, that is, it remains unchanged.

The re-determined temperature adjustment mode may also be a temperature adjustment mode corresponding to a higher temperature range of the current temperature adjustment mode, or may be a temperature adjustment mode corresponding to a lower temperature range of the current temperature adjustment mode. In this case, taking example 2 as an example, assuming that the current temperature adjustment mode is temperature adjustment mode 2, the re-determined temperature adjustment mode can be temperature adjustment mode 1 or temperature adjustment mode 3, and cross-level adjustment is not possible For temperature control mode 4-N.

During specific implementation, the ambient temperature can be obtained by calculating the temperature of multiple battery cells collected by the BMS system.

In one embodiment, the ambient temperature is the highest cell temperature within the battery stack.

In one embodiment, the ambient temperature is the average cell temperature within the battery stack.

Among them, the calculation method of the ambient temperature can be selected according to actual needs.

In this embodiment, two specific implementations of obtaining the ambient temperature through multiple cell temperatures are provided.

During specific implementation, the temperature adjustment mode includes an air conditioner temperature adjustment mode and a battery insert box fan temperature adjustment mode.

The air-conditioning temperature adjustment mode may include multiple air-conditioning execution modes (including air ducts), and the air-conditioning execution modes include but are not limited to the air-conditioning forced heating mode, the air-conditioning ventilation mode, the air-conditioning step heat mode, the air-conditioning step cooling mode, and the air-conditioning forced cooling mode. model.

The battery box fan tempering mode can also include multiple fan execution modes.

The air conditioning execution mode and the fan execution mode can be combined to form the temperature regulation mode. For example, the air conditioner forced cooling mode can be combined with the strongest fan execution mode to form a low temperature heating mode, then the temperature adjustment mode is low temperature heating mode, which means that the air conditioner is in the air conditioner forced cooling mode and the battery box fan is in the strongest fan execution mode .

The temperature adjustment mode can mobilize the air conditioner to switch between cooling mode, heating mode, ventilation mode, etc., and can also mobilize the battery box fan to switch between multiple fan execution modes.

In this embodiment, the precise thermal management control logic is adopted, and the ambient temperature of the battery stack and the maximum cell temperature difference in the stack are used as the main control parameters to intelligently determine the temperature adjustment mode, and mobilize the air conditioner in the cooling mode, heating mode, ventilation mode, etc. Switch between the two switches, and in each mode running state, it is linked with the battery box fan (if any) in two stages, and the battery box fan is controlled in stages and time-sharing to ensure that the high temperature and temperature consistency of the battery cells are controlled within the optimal indicators, thereby increasing the temperature. Adjust the efficiency of the system and prolong the service life of the system.

The following is an example of implementing the thermal management method of the battery stack to adjust the temperature, wherein the corresponding relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode is set to the corresponding relationship in Example 2, and the ambient temperature is the highest cell temperature in the battery stack. .

The BMS system of the power station collects the temperature of multiple cells in the battery stack in real time, calculates the ambient temperature based on the cell temperature, and determines the ambient temperature range to which the ambient temperature belongs. The temperature range is ambient temperature range 2), and the corresponding candidate temperature adjustment modes include temperature adjustment mode 1 and temperature adjustment mode 2. Then determine the temperature difference range to which the maximum cell temperature difference in the stack belongs at this time. Assuming that the maximum cell temperature difference is within temperature difference range 1 (that is, the temperature difference range to which the maximum cell temperature difference belongs is temperature difference range 1), you can select the candidate temperature adjustment mode from the temperature difference range. Make sure that the temperature adjustment mode is temperature adjustment mode 1.

During the temperature adjustment process, the cell temperature changes, resulting in changes in the ambient temperature and the maximum cell temperature difference. If the ambient temperature is still within the ambient temperature range 2, the corresponding candidate temperature adjustment mode remains unchanged, and the maximum cell temperature difference expands to the temperature difference. Within the range 2 and the working time satisfies the temperature hysteresis time, the temperature adjustment mode is switched from the temperature adjustment mode 1 to the temperature adjustment mode 2.

Similarly, after the temperature adjustment mode is switched to the temperature adjustment mode 2, the ambient temperature is still within the ambient temperature range 2, and the corresponding candidate temperature adjustment mode remains unchanged. If the maximum cell temperature difference is reduced to the temperature difference range 1 and the working time meets the temperature return If the difference time is longer, the temperature adjustment mode is switched from the temperature adjustment mode 2 to the temperature adjustment mode 1.

During operation, if the ambient temperature range to which the ambient temperature belongs increases from ambient temperature range 2 to ambient temperature range 3, the corresponding candidate temperature adjustment modes include temperature adjustment mode 2 and temperature adjustment mode 3. Then determine the temperature adjustment mode according to the maximum cell temperature difference.

A domestic project that has been put into operation has adopted the thermal management method of the battery stack. Under the same air-conditioning hardware and air duct structure configuration, the ambient temperature (which is the highest cell temperature in the battery stack) and the maximum cell temperature difference in the battery stack From 42°C/18°C before adopting this thermal management method to the current 38°C/10°C, the precise temperature adjustment effect is remarkable.

Example 3

FIG. 5 is a schematic structural diagram of an electronic device according to Embodiment 3 of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for thermal management of the battery stack in Embodiment 1 is implemented. The electronic device 30 shown in FIG. 5 is only an example, and should not impose any limitation on the function and scope of use of the embodiments of the present invention.

The electronic device 30 may take the form of a general-purpose computing device, which may be, for example, a server device. Components of the electronic device 30 may include, but are not limited to, the above-mentioned at least one processor 31 , the above-mentioned at least one memory 32 , and a bus 33 connecting different system components (including the memory 32 and the processor 31 ).

The bus 33 includes a data bus, an address bus and a control bus.

Memory 32 may include volatile memory, such as random access memory (RAM) 321 and/or cache memory 322 , and may further include read only memory (ROM) 323 .

The memory 32 may also include a program/utility 325 having a set (at least one) of program modules 324 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, which An implementation of a network environment may be included in each or some combination of the examples.

The processor 31 executes various functional applications and data processing by running the computer program stored in the memory 32, such as the thermal management method of the battery stack in Embodiment 1 of the present invention.

The electronic device 30 may also communicate with one or more external devices 34 (eg, keys, pointing devices, etc.). Such communication may take place through input/output (I/O) interface 35 . Also, the model-generated electronic device 30 may also communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN), and/or a public network such as the Internet) through a network adapter 36 . As shown, network adapter 36 communicates with other modules of model-generated electronics 30 via bus 33 . It should be understood that, although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generated electronics 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID ( disk arrays) systems, tape drives, and data backup storage systems.

It should be noted that although several modules/modules or sub-modules/modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. Indeed, according to embodiments of the present invention, the features and functions of two or more modules/modules described above may be embodied in one module/module; conversely, the features and functions of one module/module described above It can be further divided to be embodied by multiple modules/modules.

Example 4

This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the thermal management method for a battery stack in Embodiment 1.

Wherein, the readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any of the above suitable combination.

In a possible implementation manner, the present invention can also be implemented in the form of a program product, which includes program codes, when the program product runs on a terminal device, the program code is used to cause the terminal device to execute the implementation The thermal management method of the battery stack in Example 1.

Wherein, the program code for executing the present invention can be written in any combination of one or more programming languages, and the program code can be completely executed on the user equipment, partially executed on the user equipment, as an independent The software package executes on the user's device, partly on the user's device, partly on the remote device, or entirely on the remote device.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (10)

1. A method for thermal management of a cell stack, wherein a cell stack comprises a plurality of cells, the method comprising:

acquiring an ambient temperature and a maximum cell temperature difference;

and determining a temperature adjusting mode according to the environment temperature and the maximum cell temperature difference.

2. The method of claim 1, wherein determining the attemperation mode based on the ambient temperature and the maximum cell temperature difference comprises:

presetting a corresponding relation between an environment temperature range and a temperature difference range and the temperature adjusting mode;

and determining the temperature adjusting mode according to the environment temperature, the maximum electric core temperature difference and the corresponding relation.

3. The method of claim 2, wherein the determining the attemperation mode from the ambient temperature, the maximum cell temperature difference, and the correspondence comprises:

determining the range of the environment temperature according to the environment temperature;

determining a corresponding candidate temperature regulation mode according to the environment temperature range to which the temperature regulation mode belongs;

and determining the corresponding temperature regulation mode from the candidate temperature regulation modes according to the maximum cell temperature difference.

4. The method of thermal management of a battery stack of claim 3, wherein the ambient temperature range comprises a lowest temperature range and a highest temperature range, a minimum threshold of the highest temperature range being greater than a maximum threshold of the lowest temperature range;

if the environment temperature range to which the environment temperature belongs is the lowest temperature range, determining that the corresponding candidate temperature adjusting mode is a low-temperature heating mode; or if the environment temperature range to which the environment temperature belongs is the highest temperature range, determining that the corresponding candidate temperature regulation mode is the high-temperature refrigeration mode.

5. The method of thermal management of a cell stack of claim 1, further comprising:

and if the working time of the current temperature regulation mode reaches the preset temperature return difference time, re-determining the temperature regulation mode, wherein the re-determined temperature regulation mode is the temperature regulation mode corresponding to the higher-level temperature range of the current temperature regulation mode or the temperature regulation mode corresponding to the lower-level temperature range of the current temperature regulation mode.

6. The method of claim 1, wherein the ambient temperature is a highest cell temperature within the stack or an average cell temperature within the stack.

7. The method of thermal management of a battery stack of claim 1, wherein the attemperation mode comprises an air conditioning attemperation mode and a battery box fan attemperation mode.

8. A thermal management system for a cell stack, wherein a cell stack comprises a plurality of cells, the thermal management system comprising: the system comprises an acquisition module and a temperature regulation module;

the acquisition module is used for acquiring the environment temperature and the maximum electric core temperature difference;

the temperature adjusting module is used for determining a temperature adjusting mode according to the environment temperature and the maximum battery core temperature difference.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of thermal management of a battery stack of any of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for thermal management of a cell stack according to any one of claims 1 to 7.

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