Efficient power battery thermal management system

Abstract

The invention relates to an efficient power battery thermal management system which comprises a battery pack body, an electrode mechanism arranged at the top of the battery pack body and a thermoelectric cooling and heating mechanism arranged on the side face of the battery pack body. The thermoelectric cooling and heating mechanism comprises a temperature sensor, a control module and a cold-heat conversion component; the acquisition end of the temperature sensor is connected with the electrode mechanism; the input end of the control module is connected with the output end of the temperature sensor; the cold-heat conversion part is connected with the output end of the control module; the control module is used for controlling the input current direction of the cold-heat conversion component to achieve the refrigerating and heating functions and adjusting the refrigerating capacity or heating capacity output by controlling the input current of the cold-heat conversion component. Wherein the cold-heat conversion part is a thermoelectric chip. The efficient power battery thermal management system provided by the invention is good in temperature control effect, high in safety and long in service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-efficiency power battery thermal management system. Background Art

[0002] Lithium-ion batteries are widely used in energy storage, power and other fields. Although their fast charging and discharging characteristics meet the energy demand, a large amount of heat is generated in the process. When the battery temperature exceeds the normal operating temperature range (0℃-40℃), whether it is the reduced discharge efficiency and life decline caused by high temperature, or the reduced charging and discharging efficiency and accelerated capacity decline caused by low temperature, it will seriously affect the battery's performance and life.

[0003] At present, common heat dissipation methods such as air cooling, liquid cooling, composite phase change material temperature equalization and phase change cooling can reduce the battery temperature to a certain extent, but they have limitations in battery thermal management in low temperature environments and cannot effectively solve the many problems caused by low temperatures. Thermoelectric cooling technology (TEC) is based on the Peltier cooling and heating effects of semiconductors. It achieves hot and cold switching by changing the input current of the thermoelectric chip, and can cope with battery thermal management in a wide temperature range environment. However, the existing thermoelectric cooling technology (TEC) has a slow response speed and poor temperature equalization performance.

[0004] Therefore, the present invention provides a high-efficiency power battery thermal management system to solve the above technical problems. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide a high-efficiency power battery thermal management system with good temperature control effect, high safety and long service life.

[0006] The present invention provides a high-efficiency power battery thermal management system, comprising:

[0007] Battery pack body;

[0008] An electrode mechanism, which is arranged on the top of the battery pack body;

[0009] A thermoelectric cooling and heating mechanism is arranged on the side of the battery pack body; and the thermoelectric cooling and heating mechanism includes a temperature sensor, a control module and a cold-heat conversion component; the acquisition end of the temperature sensor is connected to the electrode mechanism, and is used to collect temperature information of the battery pack body. When the temperature of the battery pack body does not reach a preset temperature, the information is fed back to the control module; the input end of the control module is connected to the output end of the temperature sensor, and is used to receive the temperature information of the battery pack body; the cold-heat conversion component is connected to the output end of the control module; the control module is used to control the input current direction of the cold-heat conversion component to realize cooling and heating functions, and to adjust the cooling or heating output by controlling the input current of the cold-heat conversion component; wherein the cold-heat conversion component is a thermoelectric chip (TEC).

[0010] Preferably, the battery pack body includes a plurality of battery cells and a heat conduction and temperature equalization mechanism disposed between the plurality of battery cells.

[0011] Preferably, the battery pack electrode cooling and heating device also includes a cooling and heating device arranged at the bottom of the battery pack body, and the cooling and heating device includes a high thermal conductivity silicone sheet, a high thermal conductivity metal plate or a temperature equalizing plate stacked on the high thermal conductivity silicone sheet, a thermoelectric chip element sandwiched between the high thermal conductivity metal plate or the temperature equalizing plate and the battery pack body, and a liquid-cooled heat sink arranged at the bottom of the high thermal conductivity silicone sheet.

[0012] Preferably, the control module is embedded with a heat dissipation and temperature control model for establishing the heat generation of the battery pack body and the thermoelectric chip, and the construction of the heat dissipation and temperature control model is performed according to the following steps: taking the ambient temperature and the target control temperature as basic input parameters, and transmitting the basic input parameters to the preset construction model; calculating the heat generation of the battery pack body under different operating conditions and the input current required for temperature control of the thermoelectric chip according to the operating status information of the battery pack body; calculating the ratio of the cold surface temperature of the thermoelectric chip under the input current when the temperature control is in place and the heat generation of the battery pack body, and using the ratio as the temperature control coefficient; establishing a correlation between the heat generation of the battery pack body and the input current of the thermoelectric chip according to the temperature control coefficient, and thereby obtaining the heat dissipation and temperature control model.

[0013] Preferably, the control module includes a target temperature setting and transmission module, a PID controller and a thermoelectric chip controller; wherein the PID controller is simultaneously connected to the temperature sensor and the target temperature setting and transmission module, and the thermoelectric chip controller is simultaneously connected to the PID controller and the thermoelectric chip; the target temperature setting and transmission module is used to set the target control temperature of the battery pack body and transmit the target control temperature to the PID controller; the PID controller is used to receive the target control temperature from the target temperature setting and transmission module and transmit the target control temperature to the thermoelectric chip controller, and the PID controller is also used to process the information fed back by the temperature sensor to achieve optimal regulation of the cooling output of the thermoelectric chip; the thermoelectric chip controller is used to receive the target control temperature information transmitted by the PID controller, and directly control the input current of the thermoelectric chip based on the target control temperature information to achieve regulation of the cooling output of the thermoelectric chip.

[0014] Preferably, the control module further includes a general control unit connected to the thermoelectric chip controller and a temperature control strategy execution unit connected to the general control unit and provided with a main control module, wherein the general control unit is used to read the temperature data of the temperature sensor from the thermoelectric chip controller, and process, judge and issue control instructions to the temperature data; the data processing includes identifying the highest temperature and the lowest temperature in the battery pack body, processing the temperature difference in the battery pack body, and analyzing and judging the operating status information of the battery pack body to determine the weight ratio of temperature control and temperature uniformity. When the temperature of the battery pack body is within the target control temperature, the temperature control strategy execution unit is started, and the temperature control strategy execution unit performs the following steps: analyzing and processing the temperature data of the temperature sensor to obtain the temperature difference in the battery pack body, and using the temperature difference to represent the uniformity of the temperature of the battery pack body, and the temperature difference is less than 2 degrees Celsius; transmitting the temperature difference in the battery pack body to the main control module, and the main control module calculates the new temperature value T of the battery pack body to maintain uniformity according to the temperature difference in the battery pack body. target , and the new temperature value T target The thermoelectric chip controller controls the cooling output of the thermoelectric chip according to the temperature distribution result of the battery pack body at a certain moment. In a high temperature environment, if the average temperature of the battery pack body T n >The new temperature value T target , the thermoelectric chip controller increases the cooling output to the thermoelectric chip. If the average temperature of the battery pack body is T n <The new temperature value T target, the thermoelectric chip controller reduces the cooling output to the thermoelectric chip. In a low temperature environment, the input current direction of the thermoelectric chip is reversed and switched to a heating mode. When the average temperature of the battery pack body T n >The new temperature value T target , the thermoelectric chip controller reduces the heat output to the thermoelectric chip, and when the average temperature of the battery pack body T n <The new temperature value T target , the thermoelectric chip controller increases the heat output to the thermoelectric chip; the execution steps of the above-mentioned temperature average control strategy execution unit are completed within the sampling interval of the battery pack body temperature, and in the next sampling cycle, the temperature data of the temperature sensor is re-read, and the re-read temperature data is uploaded to the main control unit for processing and judgment, and an instruction for temperature average and temperature control is issued to the main control module. If it is a temperature control instruction, the execution steps of the temperature average control strategy execution unit are cycled again.

[0015] Compared with the related art, the present invention provides a high-efficiency power battery thermal management system, comprising a battery pack body, an electrode mechanism arranged on the top of the battery pack body and a thermoelectric cooling and heating mechanism arranged on the side of the battery pack body; the thermoelectric cooling and heating mechanism comprises a temperature sensor, a control module and a cold-heat conversion component; the acquisition end of the temperature sensor is connected to the electrode mechanism; the input end of the control module is connected to the output end of the temperature sensor; the cold-heat conversion component is connected to the output end of the control module; the control module is used to control the input current direction of the cold-heat conversion component to realize the cooling and heating functions, and adjust the cooling or heating output by controlling the input current of the cold-heat conversion component; wherein the cold-heat conversion component is a thermoelectric chip; in the above structure, the temperature of the electrode mechanism is controlled and regulated by the thermoelectric cooling and heating mechanism, the service life of the battery pack body is extended, and the safety of the battery pack body during use is ensured; through the setting of the heat conduction temperature equalization mechanism, the electrode mechanism can be quickly dissipated or heated, the temperature between the electrodes is effectively balanced, and the heat of the battery pack body can be evenly heated, dissipated and heated, thereby effectively reducing the attenuation rate of the battery pack body and ensuring that the battery pack body is maintained in a suitable temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a high-efficiency power battery thermal management system of the present invention;

[0017] Figure 2 It is a schematic diagram of a partial three-dimensional structure of a high-efficiency power battery thermal management system of the present invention;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the thermoelectric cooling and heating mechanism in the present invention;

[0019] Figure 4 A schematic diagram of a process for establishing a heat dissipation and temperature control model in the present invention;

[0020] Figure 5 It is a schematic diagram of a part of the working process of connecting the target temperature setting and transmission module, the temperature sensor, the PID controller, the thermoelectric chip and the thermoelectric chip controller in the present invention;

[0021] Figure 6 It is a schematic diagram of a part of the working process in which the thermoelectric chip controller, the general control unit, the main control module and the temperature control strategy execution unit are connected in the present invention;

[0022] Figure 7 This is a diagram showing the temperature uniformity control effect of the battery pack body in the present invention. DETAILED DESCRIPTION

[0023] The present invention provides a high-efficiency power battery thermal management system, aiming to solve the problems of slow response speed and poor temperature uniformity performance of existing thermoelectric heat dissipation technology.

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Please see attached Figure 1-7 As shown, the present invention provides a high-efficiency power battery thermal management system, including a battery pack body 1; an electrode mechanism 2, which is arranged on the top of the battery pack body 1; a thermoelectric cooling and heating mechanism 3, which is arranged on the side of the battery pack body 1; and the thermoelectric cooling and heating mechanism 3 includes a temperature sensor 31, a control module 32 and a cold-heat conversion component 33; the acquisition end of the temperature sensor 31 is connected to the electrode mechanism 2, and is used to collect temperature information of the battery pack body 1. When the temperature of the battery pack body 1 does not reach a preset temperature, the information is fed back to the control module 32; the input end of the control module 32 is connected to the output end of the temperature sensor 31, and is used to receive the temperature information of the battery pack body 1; the cold-heat conversion component 33 is connected to the output end of the control module 32; the control module 32 is used to control the input current direction of the cold-heat conversion component 33 to realize the cooling and heating functions, and by controlling the input current size of the cold-heat conversion component 33, the size of the cooling capacity or heating output is adjusted; wherein the cold-heat conversion component 33 is a thermoelectric chip (TEC).

[0026] In the above structure, the temperature control and adjustment of the battery pack body 1 and the electrode mechanism 2 are realized through the thermoelectric cooling and heating mechanism 3, which prolongs the service life of the battery pack body 1, ensures the safety of the battery pack body 1 during use, and can quickly dissipate heat or heat the electrode mechanism 2, effectively balance the temperature between the electrodes, and can evenly distribute the temperature, dissipate heat and heat the heat of the battery pack body 1, thereby effectively reducing the attenuation rate of the battery pack body 1 and ensuring that the battery pack body 1 is maintained in a suitable temperature environment.

[0027] Specifically, the battery pack body 1 includes a plurality of battery cells and a heat conduction and temperature equalization mechanism 4 disposed between the plurality of battery cells. The arrangement of this structure can quickly conduct and evenly disperse the heat generated by each battery cell, avoiding local heat accumulation, thereby significantly improving the thermal stability of the battery pack body, ensuring that the battery pack body works efficiently within a suitable temperature range, and extending the service life of the battery pack.

[0028] Furthermore, the high-efficiency power battery thermal management system also includes a cooling and heating mechanism 5 disposed at the bottom of the battery pack body 1, and the cooling and heating device 5 includes a high thermal conductivity silicone sheet 51, a high thermal conductivity metal plate or a temperature averaging plate 52 stacked on the high thermal conductivity silicone sheet 51, a thermoelectric chip element 53 sandwiched between the high thermal conductivity metal plate or the temperature averaging plate 52 and the battery pack body 1, and a liquid cooling radiator 54 disposed at the bottom of the high thermal conductivity silicone sheet 51. The setting of this structure is used to assist the temperature control of the high-efficiency power battery thermal management system.

[0029] In this embodiment, the control module 32 is embedded with a heat dissipation temperature control model for establishing the heat generation of the battery pack body and the thermoelectric chip (TEC). The construction of the heat dissipation temperature control model is performed according to the following steps: taking the ambient temperature and the target control temperature as basic input parameters, and transmitting the basic input parameters to the preset construction model; according to the operating status information of the battery pack body 1, calculating the heat generation Q of the battery pack body 1 under different operating states and the input current I required for the thermoelectric chip (TEC) temperature control t ; Calculate the input current I when the thermoelectric chip (TEC) is in temperature control t The cold surface temperature T C and the ratio of the heat generated Q of the battery pack body 1, and taking the ratio as the temperature control coefficient K; according to the temperature control coefficient K, a correlation relationship between the heat generated by the battery pack body 1 and the input current It of the thermoelectric chip (TEC) is established, thereby obtaining the heat dissipation temperature control model.

[0030] In the above structure, the heat dissipation and temperature control model can quickly determine the input current required by the thermoelectric chip (TEC) when the battery pack body 1 reaches the target control temperature based on the ambient temperature of the battery pack body 1 and the operating status information of the battery pack body 1, and can respond to the temperature control requirements of the battery pack body 1 more quickly.

[0031] Furthermore, the control module 32 includes a target temperature setting and transmission module 321, a PID controller 322 and a thermoelectric chip controller 323; wherein the PID controller 322 is connected to the temperature sensor 31 and the target temperature setting and transmission module 321 at the same time, and the thermoelectric chip controller 323 is connected to the PID controller 322 and the thermoelectric chip (TEC) at the same time; the target temperature setting and transmission module 321 is used to set the target control temperature of the battery pack body 1 and transmit the target control temperature to the PID controller 322; the PID controller 322 is used to The target control temperature is received from the target temperature setting and transmission module 321, and the target control temperature is transmitted to the thermoelectric chip (TEC) controller 323, and the PID controller 322 is also used to process the information fed back by the temperature sensor 31 to achieve optimized regulation of the cooling output of the thermoelectric chip (TEC); the thermoelectric chip (TEC) controller 323 is used to receive the target control temperature information transmitted by the PID controller 322, and directly control the input current of the thermoelectric chip (TEC) based on the target control temperature information to achieve regulation of the cooling output of the thermoelectric chip (TEC).

[0032] It should be noted that the input current of the thermoelectric chip (TEC) needs to be given at the first time according to the environment and operating status information of the battery pack body 1. When the temperature of the battery pack body 1 does not reach the target control temperature, the temperature sensor 31 feeds back to the PID controller 322 to optimize and adjust the cooling output of the thermoelectric chip (TEC), and finally achieve the target control temperature of the battery pack body 1. The key to more accurately controlling the temperature uniformity performance of the battery pack body 1 is to ensure the rapid response of the thermoelectric cooling and heating mechanism 3.

[0033] In this embodiment, the control module 32 also includes a general control unit 324 connected to the thermoelectric chip controller 323 and a temperature control strategy execution unit 326 connected to the general control unit 324 and provided with a main control module 325. The general control unit 324 is used to read the temperature data of the temperature sensor 31 from the thermoelectric chip controller 323, and process, judge and issue control instructions to the temperature data; the data processing includes identifying the highest temperature and the lowest temperature in the battery pack body 1, processing the temperature difference in the battery pack body 1, and analyzing and judging the operating status information of the battery pack body 1 to determine the temperature control and temperature averaging. When the temperature of the battery pack body 1 is within the target control temperature, the average temperature control strategy execution unit 326 is started, and the average temperature control strategy execution unit 326 performs the following steps: analyzing and processing the temperature data of the temperature sensor 31 to obtain the temperature difference in the battery pack body 1, and using the temperature difference to represent the uniformity of the temperature of the battery pack body 1, and the temperature difference is less than 2 degrees Celsius; transmitting the temperature difference in the battery pack body 1 to the main control module 325, and the main control module 325 calculates a new temperature value T of the battery pack body 1 to maintain uniformity according to the temperature difference in the battery pack body 1. target , and the new temperature value T target The thermoelectric chip controller 323 controls the cooling output of the thermoelectric chip (TEC) according to the temperature distribution result of the battery pack body 1 at a certain moment. In a high temperature environment, if the average temperature T of the battery pack body 1 n >The new temperature value T target , the thermoelectric chip controller 323 increases the cooling output to the thermoelectric chip (TEC). If the average temperature T of the battery pack body 1 n <The new temperature value T target , the thermoelectric chip controller 323 reduces the cooling output to the thermoelectric chip (TEC). In a low temperature environment, the input current direction of the thermoelectric chip (TEC) is reversed and switched to a heating mode. When the average temperature T of the battery pack body 1 is n >The new temperature value T target , the thermoelectric chip controller 323 reduces the heat output to the thermoelectric chip (TEC), and when the average temperature T of the battery pack body 1 n <The new temperature value T target, the thermoelectric chip controller 323 increases the heat output to the thermoelectric chip (TEC); the execution steps of the above-mentioned temperature average control strategy execution unit 326 are completed within the sampling interval of the temperature of the battery pack body 1, and in the next sampling cycle, the temperature data of the temperature sensor 31 is re-read, and the re-read temperature data is uploaded to the main control unit 324 for processing and judgment, and an instruction for temperature average and temperature control is issued to the main control module 325. If it is a temperature control instruction, the execution steps of the temperature average control strategy execution unit 326 are cycled again.

[0034] In the above structure, a control idea of ​​giving priority to temperature control and secondarily to temperature equalization is proposed. The priority of the control process is determined by the weight ratio of temperature control and temperature equalization, and the weight ratio is determined by the battery operating state. Such a control strategy gives priority to ensuring the safe operation of the battery to the greatest extent. In addition. A corresponding thermoelectric chip is set on the electrode of each battery cell, and each thermoelectric chip or multiple thermoelectric chips corresponds to a thermoelectric chip controller, and each thermoelectric chip controller can independently and accurately control the cooling or heat output of the corresponding thermoelectric chip. According to the temperature distribution of the battery pack body 1, the battery temperature control requirements at different positions in the battery pack body 1 are determined, and the thermoelectric chip controller will adjust the current of the thermoelectric chip at the corresponding position to achieve personalized temperature control of different battery cells in the battery pack body 1, thereby achieving an efficient temperature equalization process.

[0035] Compared with the related art, the present invention provides a high-efficiency power battery thermal management system, comprising a battery pack body, an electrode mechanism arranged on the top of the battery pack body and a thermoelectric cooling and heating mechanism arranged on the side of the battery pack body; the thermoelectric cooling and heating mechanism comprises a temperature sensor, a control module and a cold-heat conversion component; the acquisition end of the temperature sensor is connected to the electrode mechanism; the input end of the control module is connected to the output end of the temperature sensor; the cold-heat conversion component is connected to the output end of the control module; the control module is used to control the input current direction of the cold-heat conversion component to realize the cooling and heating functions, and adjust the cooling or heating output by controlling the input current of the cold-heat conversion component; wherein the cold-heat conversion component is a thermoelectric chip; in the above structure, the temperature of the electrode mechanism is controlled and regulated by the thermoelectric cooling and heating mechanism, the service life of the battery pack body is extended, and the safety of the battery pack body during use is ensured; through the setting of the heat conduction temperature equalization mechanism, the electrode mechanism can be quickly dissipated or heated, the temperature between the electrodes is effectively balanced, and the heat of the battery pack body can be evenly heated, dissipated and heated, thereby effectively reducing the attenuation rate of the battery pack body and ensuring that the battery pack body is maintained in a suitable temperature environment.

[0036] The above-described embodiments should be understood as illustrative rather than limiting the scope of protection of the present invention, which is subject to the claims. For those skilled in the art, some non-essential improvements and adjustments made to the present invention still fall within the scope of protection of the present invention without departing from the essence and scope of the present invention.

Claims

1. A high-efficiency power battery thermal management system, characterized in that: The device comprises: Battery pack body; An electrode mechanism, which is arranged on the top of the battery pack body; A thermoelectric cooling and heating mechanism is arranged on the side of the battery pack body; and the thermoelectric cooling and heating mechanism includes a temperature sensor, a control module and a cold-heat conversion component; the acquisition end of the temperature sensor is connected to the electrode mechanism, and is used to collect temperature information of the battery pack body. When the temperature of the battery pack body does not reach a preset temperature, the information is fed back to the control module; the input end of the control module is connected to the output end of the temperature sensor, and is used to receive the temperature information of the battery pack body; the cold-heat conversion component is connected to the output end of the control module; the control module is used to control the input current direction of the cold-heat conversion component to realize cooling and heating functions, and to adjust the cooling or heating output by controlling the input current of the cold-heat conversion component; wherein the cold-heat conversion component is a thermoelectric chip (TEC).

2. A high-efficiency power battery thermal management system according to claim 1, characterized in that: The battery pack body includes a plurality of battery cells and a heat conduction and temperature equalization mechanism arranged between the plurality of battery cells.

3. A high-efficiency power battery thermal management system according to claim 2, characterized in that: The battery pack electrode cooling and heating device also includes a cooling and heating device arranged at the bottom of the battery pack body, and the cooling and heating device includes a high thermal conductivity silicone sheet, a high thermal conductivity metal plate or a temperature equalizing plate stacked on the high thermal conductivity silicone sheet, a thermoelectric chip element sandwiched between the high thermal conductivity metal plate or the temperature equalizing plate and the battery pack body, and a liquid-cooled heat sink arranged at the bottom of the high thermal conductivity silicone sheet.

4. A high-efficiency power battery thermal management system according to claim 3, characterized in that: The control module is embedded with a heat dissipation and temperature control model for establishing the heat generation of the battery pack body and the thermoelectric chip. The construction of the heat dissipation and temperature control model is performed according to the following steps: taking the ambient temperature and the target control temperature as basic input parameters, and transmitting the basic input parameters to the preset construction model; calculating the heat generation of the battery pack body under different operating conditions and the input current required for temperature control of the thermoelectric chip according to the operating status information of the battery pack body; calculating the ratio of the cold surface temperature of the thermoelectric chip under the input current when the temperature control is in place and the heat generation of the battery pack body, and using the ratio as the temperature control coefficient; establishing the correlation between the heat generation of the battery pack body and the input current of the thermoelectric chip according to the temperature control coefficient, and then obtaining the heat dissipation and temperature control model.

5. A high-efficiency power battery thermal management system according to claim 4, characterized in that: The control module includes a target temperature setting and transmission module, a PID controller and a thermoelectric chip controller; wherein the PID controller is connected to the temperature sensor and the target temperature setting and transmission module at the same time, and the thermoelectric chip controller is connected to the PID controller and the thermoelectric chip at the same time; the target temperature setting and transmission module is used to set the target control temperature of the battery pack body and transmit the target control temperature to the PID controller; the PID controller is used to receive the target control temperature from the target temperature setting and transmission module and transmit the target control temperature to the thermoelectric chip controller, and the PID controller is also used to process the information fed back by the temperature sensor to achieve optimal regulation of the cooling output of the thermoelectric chip; the thermoelectric chip controller is used to receive the target control temperature information transmitted by the PID controller, and directly control the input current of the thermoelectric chip based on the target control temperature information to achieve regulation of the cooling output of the thermoelectric chip.

6. A high-efficiency power battery thermal management system according to claim 5, characterized in that: The control module also includes a general control unit connected to the thermoelectric chip controller and a temperature control strategy execution unit connected to the general control unit and provided with a main control module, wherein the general control unit is used to read the temperature data of the temperature sensor from the thermoelectric chip controller, and process, judge and issue control instructions to the temperature data; the data processing includes identifying the highest temperature and the lowest temperature in the battery pack body, processing the temperature difference in the battery pack body, and analyzing and judging the operating status information of the battery pack body to determine the weight ratio of temperature control and temperature equalization. When the temperature of the battery pack body is within the target control temperature, the temperature control strategy execution unit is started, and the temperature control strategy execution unit performs the following steps: analyzing and processing the temperature data of the temperature sensor to obtain the temperature difference in the battery pack body, and using the temperature difference to represent the uniformity of the temperature of the battery pack body, and the temperature difference is less than 2 degrees Celsius; The temperature difference in the battery pack body is transmitted to the main control module, and the main control module calculates a new temperature value T of the battery pack body to maintain uniformity according to the temperature difference in the battery pack body. target , and the new temperature value T target The thermoelectric chip controller controls the cooling output of the thermoelectric chip according to the temperature distribution result of the battery pack body at a certain moment. In a high temperature environment, if the average temperature of the battery pack body T n >The new temperature value T target , the thermoelectric chip controller increases the cooling output to the thermoelectric chip. If the average temperature of the battery pack body is T n <The new temperature value T target , the thermoelectric chip controller reduces the cooling output to the thermoelectric chip. In a low temperature environment, the input current direction of the thermoelectric chip is reversed and switched to a heating mode. When the average temperature of the battery pack body T n >The new temperature value T target , the thermoelectric chip controller reduces the heat output to the thermoelectric chip, and when the average temperature of the battery pack body T n <The new temperature value T target , the thermoelectric chip controller increases the heat output to the thermoelectric chip; the execution steps of the above-mentioned temperature average control strategy execution unit are completed within the sampling interval of the battery pack body temperature, and in the next sampling cycle, the temperature data of the temperature sensor is re-read, and the re-read temperature data is uploaded to the main control unit for processing and judgment, and an instruction for temperature average and temperature control is issued to the main control module. If it is a temperature control instruction, the execution steps of the temperature average control strategy execution unit are cycled again.

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