CN114883699A - Thermal management method, system, device and storage medium for battery stack - Google Patents
Thermal management method, system, device and storage medium for battery stack Download PDFInfo
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- 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
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/635—Control systems based on ambient temperature
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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
Technical Field
The invention relates to the technical field of energy storage power stations, in particular to a thermal management method, system, equipment and storage medium of a battery stack.
Background
At present, the heat management control system of an energy storage power station in the industry basically has two modes:
(1) the working mode of the air conditioner is controlled by taking the return air temperature of the air conditioner as the environmental temperature of the power station, and the mode only controls the environmental temperature in the power station and cannot truly and accurately reflect the temperature of the cell.
(2) The air conditioning mode is controlled by taking the maximum value or the average temperature of the battery temperature acquisition point as a criterion, and although the cell temperature is considered in the mode, the temperature difference of the cells in the stack is not considered, so that the consistency of the system cannot be ensured, and the efficiency and the service life of the system are influenced.
Each of the two thermal management approaches described above has drawbacks.
Disclosure of Invention
The invention provides a thermal management method, a system, equipment and a storage medium of a battery stack, aiming at overcoming the defects of the two thermal management modes in the prior art.
The invention solves the technical problems through the following technical scheme:
the invention provides a thermal management method of a battery stack, wherein the 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.
Preferably, the determining a temperature adjustment mode according to the environment temperature and the maximum cell temperature difference includes:
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.
Preferably, the determining the temperature adjustment mode according to the environment temperature, the maximum cell temperature difference, and the corresponding relationship includes:
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.
Preferably, the environmental temperature range includes a lowest temperature range and a highest temperature range, and a minimum threshold of the highest temperature range is 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.
Preferably, the thermal management method further comprises:
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.
Preferably, the ambient temperature is a highest cell temperature in the battery stack, or the ambient temperature is an average cell temperature in the battery stack.
Preferably, the temperature adjusting mode comprises an air conditioner temperature adjusting mode and a battery plug box fan temperature adjusting mode.
The invention also provides a thermal management system of a battery stack, wherein one battery stack comprises a plurality of battery cores, and the thermal management system comprises: 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.
Preferably, the temperature adjustment module comprises: the device comprises a preset unit and a temperature adjusting unit;
the preset unit is used for presetting the corresponding relation between the environment temperature range and the temperature difference range and the temperature adjusting mode;
the temperature adjusting unit is used for determining the temperature adjusting mode according to the environment temperature, the maximum electric core temperature difference and the corresponding relation.
Preferably, the temperature adjusting unit comprises: the system comprises an ambient temperature subunit, a candidate temperature regulation subunit and a temperature regulation determining subunit;
the environment temperature subunit is used for determining the environment temperature range according to the environment temperature;
the candidate temperature adjusting subunit is used for determining a corresponding candidate temperature adjusting mode according to the environment temperature range to which the candidate temperature adjusting subunit belongs;
the temperature regulation determining subunit is configured to determine the corresponding temperature regulation mode from the candidate temperature regulation modes according to the maximum cell temperature difference.
Preferably, the environment temperature range comprises a lowest temperature range and a highest temperature range, and a minimum threshold of the highest temperature range is greater than a maximum threshold of the lowest temperature range;
the candidate temperature adjusting subunit is specifically configured to determine that the corresponding candidate temperature adjusting mode is the low-temperature heating mode if the environment temperature range to which the environment temperature belongs is the lowest temperature range; or the candidate temperature adjusting subunit is specifically configured to determine that the corresponding candidate temperature adjusting mode is the high-temperature refrigeration mode if the environment temperature range to which the environment temperature belongs is the highest temperature range.
Preferably, the temperature adjustment module is specifically configured to re-determine the temperature adjustment mode if the working duration of the current temperature adjustment mode reaches a preset temperature return difference duration, where the re-determined temperature adjustment mode is a temperature adjustment mode corresponding to a higher-level temperature range of the current temperature adjustment mode or a temperature adjustment mode corresponding to a lower-level temperature range of the current temperature adjustment mode.
Preferably, the ambient temperature is a highest cell temperature in the battery stack, or the ambient temperature is an average cell temperature in the battery stack.
Preferably, the temperature adjusting mode comprises an air conditioner temperature adjusting mode and a battery plug box fan temperature adjusting mode.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the thermal management method of the battery stack.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the aforementioned method of thermal management of a cell stack.
The positive progress effects of the invention are as follows: the method adopts accurate thermal management control logic, takes the environmental temperature of a battery stack and the maximum temperature difference of the battery cells in the stack as main control parameters, intelligently determines a temperature adjusting mode, transfers the air conditioner to be switched among a refrigeration mode, a heating mode, a ventilation mode and the like, and is in two-stage linkage with a battery plug box fan (if any) in each mode operation state, 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 cells to be controlled in an optimal index, thereby improving the efficiency of a temperature adjusting system and prolonging the service life of the system.
Drawings
Fig. 1 is a flowchart of a thermal management method of a cell stack of embodiment 1 of the present invention.
Fig. 2 is a flowchart of an embodiment of step S12 in the thermal management method for a cell stack according to embodiment 1 of the present invention.
Fig. 3 is a flowchart of an embodiment of step S122 in the thermal management method of the cell stack according to embodiment 1 of the present invention.
Fig. 4 is a block schematic diagram of a thermal management system of a cell 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 Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a thermal management method for a battery stack, where one battery stack includes a plurality of battery cells, and with reference to fig. 1, the thermal management method includes:
and S11, acquiring the environmental temperature and the maximum cell temperature difference.
And S12, determining a temperature adjusting mode according to the environment temperature and the maximum cell temperature difference.
The environment temperature is the environment temperature of the battery stack, and the maximum cell temperature difference is the maximum temperature difference of the cell temperature of the battery stack.
The tempering mode can be switched from one cooling mode to another, from a heating mode to a ventilation mode, etc.
In this embodiment, adopt accurate thermal management control logic, regard the ambient temperature of battery pile and the interior biggest electric core difference in temperature as main control parameter, the mode of adjusting the temperature is confirmed to intelligence, and the mode of adjusting the temperature can be switched over each other between refrigeration mode, heating mode, ventilation mode etc. guarantees that electric core high temperature and temperature uniformity control are in optimum index to promote temperature regulation system's efficiency, the life of extension system.
In specific implementation, referring to fig. 2, step S12 includes:
and S121, presetting a corresponding relation between an environment temperature range and a temperature difference range and a temperature regulation mode.
And S122, determining a temperature adjusting mode according to the environment temperature, the maximum cell temperature difference and the corresponding relation.
The specific temperature regulation mode is determined by the environment temperature range to which the environment temperature belongs and the temperature difference range to which the maximum cell temperature difference belongs.
Example 1 of the correspondence relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode is shown in the following table.
| Range of ambient temperature | Range of temperature difference | Mode of temperature regulation |
| Ambient temperature range 1 | - | |
| |
|
|
| |
|
|
| Ambient temperature range 3 | |
|
| Ambient temperature range 3 | |
Thermoregulation mode 3 |
| …… | …… | …… |
| Ambient temperature range N | - | Thermoregulation mode N |
In this example, the ambient temperature range divides the temperature range that can be reached from low to high into N segmented regions, N being an integer greater than 2; because the temperature difference range of the battery core in the battery stack is smaller than the ambient temperature range, the temperature difference range divides the possible temperature difference range into 2 segmented regions from low to high, and the temperature difference range (corresponding to any temperature difference range) can not be considered in some occasions.
It is understood that the correspondence between the ambient temperature range and the temperature difference range and the temperature adjustment mode is not limited to this example, and the correspondence may be set according to actual needs.
In this embodiment, a specific implementation manner of determining the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference is provided.
In specific implementation, referring to fig. 3, step S122 includes:
and S1221, determining the range of the environment temperature according to the environment temperature.
And S1222, determining a corresponding candidate temperature adjusting mode according to the belonging environment temperature range.
And S1223, determining a corresponding temperature regulation mode from the candidate temperature regulation modes according to the maximum cell temperature difference.
Because the number of segments in the environment temperature range may be greater than the number of segments in the temperature difference range, and the number of temperature adjustment modes corresponding to the same environment temperature range may be much smaller than the number of temperature adjustment modes corresponding to the same temperature difference range, the corresponding candidate temperature adjustment modes may be determined according to the environment temperature range to which the temperature adjustment modes belong, and then the temperature adjustment modes may be determined according to the temperature difference range to which the maximum cell temperature difference belongs. Therefore, the temperature adjusting mode can be determined more quickly, the reaction speed of thermal management of the cell stack is increased, and the temperature adjusting efficiency is improved.
In specific implementation, the environment temperature range includes a lowest temperature range and a highest temperature range, and a minimum threshold of the highest temperature range is greater than a maximum threshold of the lowest temperature range.
In one embodiment, step S1222 includes:
and 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 the low-temperature heating mode.
The minimum temperature range is a cell minimum temperature region allowed by the power station system, for example, the ambient temperature range 1 in example 1. When the environment temperature range to which the environment temperature belongs is the lowest temperature range, in order to ensure the system safety and the working efficiency, the temperature difference of the battery core is not considered, and the corresponding candidate temperature adjusting mode is directly determined to be the low-temperature heating mode.
In one embodiment, step S1222 includes:
and if the environment temperature range to which the environment temperature belongs is the highest temperature range, determining that the corresponding candidate temperature adjusting mode is the high-temperature refrigeration mode.
The maximum temperature range is a maximum cell temperature region allowed by the power station system, for example, the ambient temperature range N in example 1. When the environment temperature range to which the environment temperature belongs is the highest temperature range, in order to ensure the system safety and the working efficiency, the temperature difference of the battery core is not considered, and the corresponding candidate temperature adjusting mode is directly determined to be the high-temperature refrigeration mode.
In specific implementation, the thermal management method further comprises:
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.
The temperature return difference duration is set to prevent the temperature adjusting system from frequently switching modes, so that the temperature adjusting system is unstable and hardware such as an air conditioner is damaged.
In this embodiment, the re-determined temperature adjustment mode may be the current temperature adjustment mode, i.e. remain unchanged.
The re-determined temperature regulation mode may be a temperature regulation mode corresponding to a higher-level temperature range of the current temperature regulation mode, or a temperature regulation mode corresponding to a lower-level temperature range of the current temperature regulation mode. In this case, taking example 1 as an example, assuming that the current temperature adjustment mode is the temperature adjustment mode 2, the re-determined temperature adjustment mode may be the temperature adjustment mode 1, or may be the temperature adjustment mode 3, and may not be adjusted to the temperature adjustment mode 4-N in a cross-step manner.
In specific implementation, the ambient temperature may be calculated by using a plurality of cell temperatures collected by a BMS (Battery Management System).
In one embodiment, the ambient temperature is the highest cell temperature within the stack.
In one embodiment, the ambient temperature is the average cell temperature within the stack.
Wherein, the calculation method of the environmental temperature can be selected according to actual needs.
In this embodiment, two specific embodiments are provided for obtaining the ambient temperature from a plurality of cell temperatures.
During specific implementation, the temperature adjusting mode comprises an air conditioner temperature adjusting mode and a battery plug box fan temperature adjusting mode.
The air conditioner temperature adjusting mode can comprise a plurality of air conditioner execution modes (including an air duct), and the air conditioner execution modes include but are not limited to an air conditioner forced heating mode, an air conditioner ventilation mode, an air conditioner step heat mode, an air conditioner step cold mode and an air conditioner forced cooling mode.
The battery box fan attemperation mode may also include a plurality of fan execution modes.
The air conditioning execution mode and the fan execution mode may be combined to form a tempering mode. For example, the forced air-conditioning cooling mode may be combined with the strongest fan execution mode to form a low-temperature heating mode, and then the temperature adjustment mode is the low-temperature heating mode and indicates that the air conditioner is in the forced air-conditioning cooling mode and the battery box fan is in the strongest fan execution mode.
The temperature adjusting mode can be used for adjusting the air conditioner to be switched among a refrigerating mode, a heating mode, a ventilation mode and the like, and can also be used for adjusting the battery plug box fan to be switched among a plurality of fan execution modes.
In this embodiment, an accurate thermal management control logic is adopted, the ambient temperature of the battery stack and the maximum temperature difference of the battery cells in the stack are used as main control parameters, the temperature regulation mode is intelligently determined, the air conditioner is operated to be switched among the refrigeration mode, the heating mode, the ventilation mode and the like, and the air conditioner is linked with the battery plug box fan (if any) in two stages under the operation state of each mode, the battery plug box fan is controlled in a grading and time-sharing mode, the consistency of the high temperature and the temperature of the battery cells is controlled in an optimal index, so that the efficiency of the temperature regulation system is improved, and the service life of the system is prolonged.
The following is an example of implementing a thermal management method of a battery stack to adjust the temperature, where the correspondence between the ambient temperature range and the temperature difference range and the temperature adjustment mode is set as the correspondence 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 temperatures of a plurality of battery cores in the battery stack in real time, calculates the environment temperature based on the temperatures of the battery cores, judges the environment temperature range to which the environment temperature belongs, assumes that the environment temperature is within an environment temperature range 2 (namely, the environment temperature range to which the environment temperature belongs is the environment temperature range 2), and the corresponding candidate temperature adjusting mode comprises a temperature adjusting mode 1 and a temperature adjusting mode 2. And then, judging the temperature difference range to which the maximum cell temperature difference in the stack at the moment belongs, and if the maximum cell temperature difference is within the temperature difference range 1 (namely the temperature difference range to which the maximum cell temperature difference belongs is the temperature difference range 1), determining the temperature regulation mode to be the temperature regulation mode 1 from the candidate temperature regulation modes.
And if the environment temperature is still in the environment temperature range 2, the corresponding candidate temperature regulation mode is unchanged, the maximum cell temperature difference is enlarged to the temperature difference range 2, and the working time meets the temperature return difference duration, the temperature regulation mode is switched from the temperature regulation mode 1 to the temperature regulation mode 2.
Similarly, after the temperature regulation mode is switched to the temperature regulation mode 2, the environment temperature is still within the environment temperature range 2, the corresponding candidate temperature regulation mode is unchanged, and if the maximum cell temperature difference is reduced to the temperature difference range 1 and the working time meets the temperature return difference duration, the temperature regulation mode is switched from the temperature regulation mode 2 to the temperature regulation mode 1.
In the working process, if the environment temperature range to which the environment temperature belongs is increased from the environment temperature range 2 to the environment temperature range 3, the corresponding candidate temperature adjusting modes comprise a temperature adjusting mode 2 and a temperature adjusting mode 3. And determining a temperature adjusting mode according to the maximum cell temperature difference.
A certain project already put into operation in China adopts the thermal management method of the battery stack, under the same configuration of air conditioning hardware and an air duct structure, the environment temperature (which is the highest cell temperature in the battery stack) and the maximum cell temperature difference in the battery stack are optimized from 42 ℃ (centigrade degree)/18 ℃ before the thermal management method is adopted to 38 ℃/10 ℃ at present, and the accurate temperature regulation effect is obvious.
Example 2
The present embodiment provides a thermal management system for a battery stack, where one battery stack includes a plurality of battery cells, and with reference to fig. 4, the thermal management system includes: an acquisition module 1 and a temperature regulation module 2.
The obtaining module 1 is used for obtaining the ambient temperature and the maximum cell temperature difference.
The temperature adjusting module 2 is used for determining a temperature adjusting mode according to the environment temperature and the maximum cell temperature difference.
The environment temperature is the environment temperature of the battery stack, and the maximum cell temperature difference is the maximum temperature difference of the cell temperature of the battery stack.
The tempering mode can be switched from one cooling mode to another, from a heating mode to a ventilation mode, etc.
In this embodiment, adopt accurate thermal management control logic, regard the ambient temperature of battery pile and the interior biggest electric core difference in temperature as main control parameter, the mode of adjusting the temperature is confirmed to intelligence, and the mode of adjusting the temperature can be switched over each other between refrigeration mode, heating mode, ventilation mode etc. guarantees that electric core high temperature and temperature uniformity control are in optimum index to promote temperature regulation system's efficiency, the life of extension system.
In specific implementation, the temperature adjusting module 2 includes: a preset unit 21 and a tempering unit 22.
The preset unit 21 is used for presetting the corresponding relation between the environment temperature range and the temperature difference range and the temperature adjusting mode.
The temperature adjusting unit 22 is configured to determine a temperature adjusting mode according to the environment temperature, the maximum cell temperature difference, and the corresponding relationship.
The specific temperature regulation mode is determined by the environment temperature range to which the environment temperature belongs and the temperature difference range to which the maximum cell temperature difference belongs.
An example 2 of the correspondence relationship between the ambient temperature range and the temperature difference range and the temperature adjustment mode is shown in the following table.
In this example, the ambient temperature range divides the temperature range that can be reached from low to high into N segmented regions, N being an integer greater than 2; because the temperature difference range of the battery core in the battery stack is smaller than the ambient temperature range, the temperature difference range divides the possible temperature difference range into 2 segmented regions from low to high, and the temperature difference range (corresponding to any temperature difference range) can not be considered in some occasions.
It is understood that the correspondence between the ambient temperature range and the temperature difference range and the temperature adjustment mode is not limited to this example, and the correspondence may be set according to actual needs.
In this embodiment, a specific implementation manner of determining the temperature adjustment mode according to the ambient temperature and the maximum cell temperature difference is provided.
In specific implementation, the temperature adjustment unit 22 includes: an ambient temperature sub-unit 221, a candidate tempering sub-unit 222 and a determine tempering sub-unit 223.
The ambient temperature subunit 221 is configured to determine an ambient temperature range according to the ambient temperature.
The candidate temperature adjustment subunit 222 is configured to determine a corresponding candidate temperature adjustment mode according to the environment temperature range to which the candidate temperature adjustment subunit belongs.
The temperature adjustment determining subunit 223 is configured to determine a corresponding temperature adjustment mode from the candidate temperature adjustment modes according to the maximum cell temperature difference.
Because the number of segments in the environment temperature range may be greater than the number of segments in the temperature difference range, and the number of temperature adjustment modes corresponding to the same environment temperature range may be much smaller than the number of temperature adjustment modes corresponding to the same temperature difference range, the corresponding candidate temperature adjustment modes may be determined according to the environment temperature range to which the temperature adjustment modes belong, and then the temperature adjustment modes may be determined according to the temperature difference range to which the maximum cell temperature difference belongs. Therefore, the temperature adjusting mode can be determined more quickly, the reaction speed of thermal management of the cell stack is increased, and the temperature adjusting efficiency is improved.
In specific implementation, the environment temperature range includes a lowest temperature range and a highest temperature range, and a minimum threshold of the highest temperature range is greater than a maximum threshold of the lowest temperature range.
In one embodiment, the candidate temperature adjusting subunit 222 is specifically configured to determine that the corresponding candidate temperature adjusting mode is the low-temperature heating mode if the environmental temperature range to which the environmental temperature belongs is the lowest temperature range.
The minimum temperature range is a cell minimum temperature region allowed by the power station system, for example, the ambient temperature range 1 in example 2. When the environment temperature range to which the environment temperature belongs is the lowest temperature range, in order to ensure the system safety and the working efficiency, the temperature difference of the battery core is not considered, and the corresponding candidate temperature adjusting mode is directly determined to be the low-temperature heating mode.
In one embodiment, the candidate temperature adjusting subunit 222 is specifically configured to determine that the corresponding candidate temperature adjusting mode is the high-temperature cooling mode if the environment temperature range to which the environment temperature belongs is the highest temperature range.
The maximum temperature range is a maximum cell temperature region allowed by the power station system, for example, the ambient temperature range N in example 2. When the environment temperature range to which the environment temperature belongs is the highest temperature range, in order to ensure the system safety and the working efficiency, the temperature difference of the battery core is not considered, and the corresponding candidate temperature adjusting mode is directly determined to be the high-temperature refrigeration mode.
In 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, where the re-determined temperature adjustment mode is a temperature adjustment mode corresponding to a higher-level temperature range of the current temperature adjustment mode or a temperature adjustment mode corresponding to a lower-level temperature range of the current temperature adjustment mode.
The temperature return difference duration is set to prevent the temperature adjusting system from frequently switching modes, so that the temperature adjusting system is unstable and hardware such as an air conditioner is damaged.
In this embodiment, the re-determined temperature adjustment mode may be the current temperature adjustment mode, i.e. remain unchanged.
The re-determined temperature regulation mode may be a temperature regulation mode corresponding to a higher-level temperature range of the current temperature regulation mode, or a temperature regulation mode corresponding to a lower-level temperature range of the current temperature regulation mode. In this case, taking example 2 as an example, assuming that the current temperature adjustment mode is the temperature adjustment mode 2, the re-determined temperature adjustment mode may be the temperature adjustment mode 1, or may be the temperature adjustment mode 3, and may not be adjusted to the temperature adjustment mode 4-N in a cross-step manner.
When the system is specifically implemented, the ambient temperature can be calculated through a plurality of battery cell temperatures acquired by the BMS system.
In one embodiment, the ambient temperature is the highest cell temperature within the stack.
In one embodiment, the ambient temperature is the average cell temperature within the stack.
Wherein, the calculation method of the environmental temperature can be selected according to actual needs.
In this embodiment, two specific embodiments are provided for obtaining the ambient temperature from a plurality of cell temperatures.
During specific implementation, the temperature adjusting mode comprises an air conditioner temperature adjusting mode and a battery plug box fan temperature adjusting mode.
The air conditioner temperature adjusting mode can comprise a plurality of air conditioner execution modes (including an air duct), and the air conditioner execution modes include but are not limited to an air conditioner forced heating mode, an air conditioner ventilation mode, an air conditioner step heat mode, an air conditioner step cold mode and an air conditioner forced cooling mode.
The battery box fan attemperation mode may also include a plurality of fan execution modes.
The air conditioning execution mode and the fan execution mode may be combined to form a tempering mode. For example, the forced air-conditioning cooling mode may be combined with the strongest fan execution mode to form a low-temperature heating mode, and then the temperature adjustment mode is the low-temperature heating mode and indicates that the air conditioner is in the forced air-conditioning cooling mode and the battery box fan is in the strongest fan execution mode.
The temperature adjusting mode can be used for adjusting the air conditioner to be switched among a refrigerating mode, a heating mode, a ventilation mode and the like, and can also be used for adjusting the battery plug box fan to be switched among a plurality of fan execution modes.
In this embodiment, an accurate thermal management control logic is adopted, the ambient temperature of the battery stack and the maximum temperature difference of the battery cells in the stack are used as main control parameters, the temperature regulation mode is intelligently determined, the air conditioner is operated to be switched among the refrigeration mode, the heating mode, the ventilation mode and the like, and the air conditioner is linked with the battery plug box fan (if any) in two stages under the operation state of each mode, the battery plug box fan is controlled in a grading and time-sharing mode, the consistency of the high temperature and the temperature of the battery cells is controlled in an optimal index, so that the efficiency of the temperature regulation system is improved, and the service life of the system is prolonged.
The following is an example of implementing a thermal management method of a battery stack to adjust the temperature, where the correspondence between the ambient temperature range and the temperature difference range and the temperature adjustment mode is set as the correspondence 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 temperatures of a plurality of battery cores in the battery stack in real time, calculates the environment temperature based on the temperatures of the battery cores, judges the environment temperature range to which the environment temperature belongs, assumes that the environment temperature is within an environment temperature range 2 (namely, the environment temperature range to which the environment temperature belongs is the environment temperature range 2), and the corresponding candidate temperature adjusting mode comprises a temperature adjusting mode 1 and a temperature adjusting mode 2. And then, judging the temperature difference range to which the maximum cell temperature difference in the stack at the moment belongs, and if the maximum cell temperature difference is within the temperature difference range 1 (namely the temperature difference range to which the maximum cell temperature difference belongs is the temperature difference range 1), determining the temperature regulation mode to be the temperature regulation mode 1 from the candidate temperature regulation modes.
The cell temperature changes in the temperature adjustment process, so that the environment temperature and the maximum cell temperature difference change, if the environment temperature is still in the environment temperature range 2, the corresponding candidate temperature adjustment mode is unchanged, and the maximum cell temperature difference is enlarged to the temperature difference range 2, and the working time meets the temperature return difference, so that the temperature adjustment mode is switched from the temperature adjustment mode 1 to the temperature adjustment mode 2.
Similarly, after the temperature regulation mode is switched to the temperature regulation mode 2, the environment temperature is still within the environment temperature range 2, the corresponding candidate temperature regulation mode is unchanged, and if the maximum cell temperature difference is reduced to the temperature difference range 1 and the working time meets the temperature return difference duration, the temperature regulation mode is switched from the temperature regulation mode 2 to the temperature regulation mode 1.
In the working process, if the environment temperature range to which the environment temperature belongs is increased from the environment temperature range 2 to the environment temperature range 3, the corresponding candidate temperature adjusting modes comprise a temperature adjusting mode 2 and a temperature adjusting mode 3. And determining a temperature regulation mode according to the maximum cell temperature difference.
In a certain commissioning project in China, the thermal management method of the cell stack is adopted, under the same configuration of air conditioning hardware and an air duct structure, the environment temperature (which is the highest cell temperature in the cell stack) and the maximum cell temperature difference in the cell stack are optimized from 42 ℃/18 ℃ before the thermal management method is adopted to 38 ℃/10 ℃, and the accurate temperature regulation effect is obvious.
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 on the memory and executable on the processor, and the processor implements the thermal management method of the battery stack in embodiment 1 when executing the program. The electronic device 30 shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiment of the present invention.
The electronic device 30 may be embodied in the form of a general purpose computing device, which may be, for example, a server device. The components of the electronic device 30 may include, but are not limited to: the at least one processor 31, the at least one memory 32, and a bus 33 connecting the various system components (including the memory 32 and the processor 31).
The bus 33 includes a data bus, an address bus, and a control bus.
The 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 processor 31 executes various functional applications and data processing, such as the thermal management method of the cell stack in embodiment 1 of the present invention, by executing the computer program stored in the memory 32.
The electronic device 30 may also communicate with one or more external devices 34 (e.g., keys, pointing devices, etc.). Such communication may be through input/output (I/O) interfaces 35. Also, the model-generating electronic device 30 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via the network adapter 36. As shown, network adapter 36 communicates with the other modules of model-generated electronic device 30 via bus 33. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generating electronic device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.
It should be noted that although in the above detailed description several modules/modules or sub-modules/modules of the electronic device are mentioned, such division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the modules/modules described above may be embodied in one module/module, according to embodiments of the invention; conversely, the features and functions of one module/module described above may be further divided into embodiments by a plurality of modules/modules.
Example 4
The present embodiment provides a computer-readable storage medium on which a computer program is stored, the program implementing the thermal management method of the cell stack in embodiment 1 when executed by a processor.
More specific examples, among others, that the readable storage medium may employ may include, but are not limited to: a portable disk, a hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible implementation, the invention may also be implemented in the form of a program product comprising program code for causing a terminal device to perform a method of implementing thermal management of a battery stack in example 1, when said program product is run on said terminal device.
Where program code for carrying out the invention is written in any combination of one or more programming languages, the program code may be executed entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of this invention, and these changes and modifications are within the scope of this 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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| CN117393911A (en) * | 2023-12-11 | 2024-01-12 | 江苏天合储能有限公司 | Thermal management method for energy storage system, energy management system, energy storage system and medium |
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| CN117393911A (en) * | 2023-12-11 | 2024-01-12 | 江苏天合储能有限公司 | Thermal management method for energy storage system, energy management system, energy storage system and medium |
| CN117393911B (en) * | 2023-12-11 | 2024-04-16 | 江苏天合储能有限公司 | Thermal management method for energy storage system, energy management system, energy storage system and medium |
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