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EP-4738538-A1 - BATTERY TEMPERATURE CONTROL METHOD, APPARATUS AND SYSTEM, AND DEVICE AND STORAGE MEDIUM

EP4738538A1EP 4738538 A1EP4738538 A1EP 4738538A1EP-4738538-A1

Abstract

This application relates to the field of batteries, and provides a battery temperature control method, apparatus, and system, a device, and a storage medium. The method includes: obtaining a first temperature of a first battery and a second temperature of a second battery in an electric device; determining a first temperature difference based on the first temperature and the second temperature; and under a condition that the first temperature difference is greater than a predetermined first temperature difference threshold, performing cooling processing on the first battery, where the first temperature is higher than the second temperature. Under a condition that the first temperature difference is greater than the first temperature difference threshold, the first battery corresponding to the first temperature is cooled. In this way, temperatures between batteries are close, improving overall performance of the batteries, and enhancing battery use experience.

Inventors

  • WU, KAI
  • CHAN, Libing

Assignees

  • Contemporary Amperex Technology Co., Limited

Dates

Publication Date
20260506
Application Date
20240219

Claims (15)

  1. A battery temperature control method, characterized in that the method comprises: obtaining a first temperature of a first battery and a second temperature of a second battery in an electric device; determining a first temperature difference based on the first temperature and the second temperature; and under a condition that the first temperature difference is greater than a predetermined first temperature difference threshold, performing cooling processing on the first battery, wherein the first temperature is higher than the second temperature.
  2. The method according to claim 1, characterized in that the first temperature is an average of temperatures at two or more measurement points in the first battery, and the second temperature is an average of temperatures at two or more measurement points in the second battery.
  3. The method according to claim 1, characterized in that the first temperature is an average of temperatures of two or more cells in the first battery, or a temperature of a specified cell in the first battery; and the second temperature is an average of temperatures of two or more cells in the second battery, or a temperature of a specified cell in the second battery.
  4. The method according to any one of claims 1 to 3, characterized in that the obtaining a first temperature of a first battery and a second temperature of a second battery in an electric device comprises: obtaining temperatures of multiple batteries in the electric device; and determining a highest temperature and a lowest temperature of the multiple batteries, wherein the highest temperature is the first temperature of the first battery, and the lowest temperature is the second temperature of the second battery.
  5. The method according to any one of claims 1 to 3, characterized in that the obtaining a first temperature of a first battery and a second temperature of a second battery in an electric device comprises: obtaining temperatures of multiple batteries in the electric device; determining a lowest temperature of the multiple batteries as the second temperature, wherein a battery corresponding to the second temperature is the second battery; and determining other batteries rather than the second battery as first batteries, and determining first temperatures of the first batteries.
  6. The method according to any one of claims 1 to 5, characterized in that the method further comprises: under a condition that a highest temperature of the multiple cells in the first battery is greater than a predetermined first temperature threshold, performing the cooling processing on the first battery.
  7. The method according to claim 6, characterized in that the method further comprises: under a condition that the highest temperature of the multiple cells in the first battery is less than or equal to a predetermined third temperature threshold, stopping the cooling processing on the first battery, wherein the third temperature threshold is less than the first temperature threshold.
  8. The method according to any one of claims 1 to 7, characterized in that the method further comprises: under a condition that the first temperature of the first battery is greater than a predetermined second temperature threshold, performing the cooling processing on the first battery.
  9. The method according to claim 8, characterized in that the method further comprises: under a condition that the first temperature of the first battery is less than or equal to a predetermined fourth temperature threshold, stopping the cooling processing on the first battery, wherein the fourth temperature threshold is less than the second temperature threshold.
  10. The method according to any one of claims 1 to 9, characterized in that the first battery is cooled by a first unit, the second battery is cooled by a second unit, and the first unit and the second unit communicate with a battery management system.
  11. The method according to any one of claims 1 to 9, characterized in that the batteries are cooled by a unit, the unit is connected to multiple cooling channels through control valves, the cooling channels comprise a first cooling channel and a second cooling channel, and the control valves comprise a first control valve and a second control valve; and the first battery is cooled through the first cooling channel, the second battery is cooled through the second cooling channel, the unit communicates with a battery control system, and the first control valve and the second control valve communicate with a battery management system.
  12. A battery temperature control apparatus, characterized in that the apparatus comprises: a temperature obtaining unit, configured to obtain a first temperature of a first battery and a second temperature of a second battery in an electric device; a temperature difference determining unit, configured to determine a first temperature difference based on the first temperature and the second temperature; and a cooling processing unit, configured to, under a condition that the first temperature difference is greater than a predetermined first temperature difference threshold, perform cooling processing on the first battery, wherein the first temperature is higher than the second temperature.
  13. A battery temperature control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 11 when executing the computer program.
  14. An electric device, comprising two or more batteries, characterized in that cooling processing is performed on the batteries of the electric device by using the battery temperature control method according to any one of claims 1 to 11.
  15. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, characterized in that when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

Description

This application claims priority to the Chinese Patent Application No. 202310798566.2, filed with the China National Intellectual Property Administration on June 30, 2023 and entitled "BATTERY TEMPERATURE CONTROL METHOD, APPARATUS, AND SYSTEM, DEVICE, AND STORAGE MEDIUM", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of batteries, and in particular, to a battery temperature control method, apparatus, and system, a device, and a storage medium. BACKGROUND With the development of battery energy storage technology, energy density of batteries has been significantly improved. However, this progress also brings potential challenges. For instance, during operation, factors such as environmental conditions or operation power may cause a battery temperature to rise and become relatively high, compromising safe and stable battery performance. To reduce the hazards caused by excessively high battery temperature, temperature thresholds T0 and T1 may be preset. When the battery temperature reaches the temperature threshold T0, cooling is started. During the cooling process, if the temperature drops to the temperature threshold T1, cooling is stopped. In this way, the probability of excessively high battery temperature can be effectively reduced. However, when batteries are applied in scenarios such as heavy trucks and engineering machinery devices, one electric device may include multiple batteries, and there may be temperature differences between different batteries. This is not conducive to improving battery performance and affects battery usage experience. SUMMARY In view of this, embodiments of this application provide a battery temperature control method, apparatus, and system, a device, and a storage medium to solve the problem in the prior art that one electric device may include multiple batteries and there may be temperature differences between different batteries, which is not conducive to improving battery performance and affects battery usage experience. A first aspect of embodiments of this application provides a battery temperature control method, where the method includes: obtaining a first temperature of a first battery and a second temperature of a second battery in an electric device; determining a first temperature difference based on the first temperature and the second temperature; and under a condition that the first temperature difference is greater than a predetermined first temperature difference threshold, performing cooling processing on the first battery, where the first temperature is higher than the second temperature. At least two batteries may be included in the electric device. The first battery and the second battery are any two of two or more batteries, that is, any two batteries can be selected as the first battery and the second battery in a combination for temperature difference comparison and cooling processing. To determine the first temperature difference, the first temperature is greater than the second temperature, and the first temperature difference with a positive value can be obtained by subtracting the second temperature from the first temperature. Under a condition that the first temperature difference is greater than the first temperature difference threshold, cooling the first battery corresponding to the first temperature. In this way, temperatures between batteries are close, improving overall performance of the batteries, and enhancing battery use experience. With reference to the first aspect, in a first possible implementation of the first aspect, the first temperature includes an average of temperatures at two or more measurement points in the first battery, and the second temperature includes an average of temperatures at two or more measurement points in the second battery. In a possible implementation, two or more temperature sensors are provided in the battery, and two or more temperatures are collected by the two or more temperature sensors. The two or more temperature sensors may be evenly provided in the battery. Determining the first temperature of the first battery and the second temperature of the second battery based on an average of the collected two or more measurement point temperatures can improve the accuracy of the battery temperature. A more accurate battery temperature can be obtained by using the two or more temperature sensors provided in the first battery or the second battery. With reference to the first aspect, in a second possible implementation of the first aspect, the first temperature is an average of temperatures of two or more cells in the first battery, or a temperature of a specified cell in the first battery; and the second temperature is an average of temperatures of two or more cells in the second battery, or a temperature of a specified cell in the second battery. Two or more cells are respectively provided in the first battery and the second battery. A temperat