CN-120588866-B - Battery pack balancing method, device, vehicle, medium and program product

Abstract

The disclosure provides a battery pack equalization method, a device, a vehicle, a medium and a program product, and relates to the technical field of batteries, comprising: the first battery pack and the second battery pack in the battery pack are connected in parallel, the charging pile charges the battery pack, the charging connection is disconnected between the battery pack and the charging pile in response to the battery pack, and under the condition that the electric potential between the first battery pack and the second battery pack does not meet the balance condition, the first battery pack and the second battery pack are subjected to electromotive force balance, and the consistency of the battery pack inside after the battery pack is disconnected and charged is improved.

Inventors

• FANG DIWEI

Assignees

• 小米汽车科技有限公司

Dates

Publication Date

20260508

Application Date

20250723

Claims (11)

1. 1. A battery pack equalization method, wherein the battery pack comprises a first battery pack and a second battery pack, the first battery pack and the second battery pack being connected in parallel, the battery pack equalization method comprising: Determining an initial stable duration under the condition that the battery pack is charged by an initial current, wherein the initial stable duration is a duration required by the battery pack to reach a potential equilibrium state in the process of charging the battery pack according to the initial current; charging the battery pack through the charging current when the initial stabilizing period is longer than a preset stabilizing period, wherein the charging current is smaller than the initial current; determining whether a potential between the first battery pack and the second battery pack satisfies an equalization condition in response to disconnection of a charging connection between the battery pack and the charging stake; And performing potential equalization on the first battery pack and the second battery pack in the case where the potential between the first battery pack and the second battery pack does not satisfy the equalization condition.
2. 2. The battery pack equalization method according to claim 1, wherein said potential equalization of said first battery pack and said second battery pack in the case where the potential between said first battery pack and said second battery pack does not satisfy said equalization condition, comprises: Acquiring a charging current of the charging pile for charging the battery pack, a first internal resistance value of the first battery pack and a second internal resistance value of the second battery pack; and performing potential equalization on the first battery pack and the second battery pack in a case where it is determined that the potential between the first battery pack and the second battery pack does not satisfy the equalization condition, according to the charging current, the first internal resistance value, and the second internal resistance value.
3. 3. The battery pack equalization method according to claim 2, wherein said potential equalization of said first battery pack and said second battery pack in a case where it is determined that the potential between said first battery pack and said second battery pack does not satisfy said equalization condition, based on said charging current, said first internal resistance value, and said second internal resistance value, comprises: and under the condition that the charging current is larger than a preset current and the internal resistance difference between the first internal resistance value and the second internal resistance value is larger than a preset resistance value, determining that the potential between the first battery pack and the second battery pack does not meet the balance condition, and carrying out potential balance on the first battery pack and the second battery pack.
4. 4. The battery pack equalization method of claim 2, wherein said determining that the potential between the first battery pack and the second battery pack does not satisfy the equalization condition based on the charging current, the first internal resistance value, and the second internal resistance value comprises: obtaining a potential difference between the first battery pack and the second battery pack according to the charging current, the first internal resistance value and the second internal resistance value; And under the condition that the potential difference is larger than a preset potential difference, determining that the potential between the first battery pack and the second battery pack does not meet the balancing condition, and carrying out potential balancing on the first battery pack and the second battery pack.
5. 5. The battery pack equalization method of claim 4, wherein said deriving a potential difference between said first battery pack and said second battery pack based on said charge current, said first internal resistance value, and said second internal resistance value comprises: determining an internal resistance difference between the first internal resistance value and the second internal resistance value; And obtaining the potential difference between the first battery pack and the second battery pack according to the charging current and the internal resistance difference.
6. 6. The battery pack equalization method according to claim 2, wherein said potential equalization of said first battery pack and said second battery pack in the case where the potential between said first battery pack and said second battery pack does not satisfy said equalization condition, comprises: Acquiring a stable duration according to the charging current, the first internal resistance value and the second internal resistance value, wherein the stable duration is a duration required by the battery pack to reach a potential equilibrium state in the process of charging the battery pack according to the charging current; and under the condition that the charging time of the battery pack is smaller than the stabilizing time, determining that the electric potential between the first battery pack and the second battery pack does not meet the balancing condition, and carrying out electric potential balancing on the first battery pack and the second battery pack.
7. 7. The battery pack balancing method according to any one of claims 1 to 6, wherein the performing potential balancing on the first battery pack and the second battery pack includes: and performing potential equalization on the first battery pack and the second battery pack by discharging a load connected to the battery pack.
8. 8. A battery pack balancing apparatus for performing the battery pack balancing method according to any one of claims 1 to 7.
9. 9. A vehicle, characterized by comprising: A processor; A memory for storing processor-executable instructions; Wherein the processor is configured to implement the battery pack balancing method of any one of claims 1-7 when executing the instructions.
10. 10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
11. 11. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the method of any one of claims 1 to 7.

Description

Battery pack balancing method, device, vehicle, medium and program product Technical Field The present disclosure relates to the field of battery technologies, and in particular, to a battery pack balancing method, a device, a vehicle, a medium, and a program product. Background With the development of new energy technology, electric automobiles are getting increasingly widespread attention. The power in the electric car is provided by a battery pack, and the battery pack is charged by a charging pile. In order to increase the charge capacity of the battery pack, the battery pack may be composed of a plurality of battery packs, which may be charged in series or in parallel. Disclosure of Invention To overcome the problems in the related art, the present disclosure provides a battery pack balancing method, apparatus, vehicle, medium, and program product. According to a first aspect of embodiments of the present disclosure, there is provided a battery pack equalization method, the battery pack including a first battery pack and a second battery pack, the first battery pack and the second battery pack being connected in parallel, the battery pack equalization method including: determining whether a potential between the first battery pack and the second battery pack satisfies an equalization condition in response to disconnection of a charging connection between the battery pack and the charging stake; And performing potential equalization on the first battery pack and the second battery pack in the case where the potential between the first battery pack and the second battery pack does not satisfy the equalization condition. In this embodiment, in response to disconnection of the charging connection between the battery pack and the charging pile, in the case where the electric potential between the first battery pack and the second battery pack does not satisfy the equalization condition, electromotive force equalization is performed on the first battery pack and the second battery pack, and consistency of the inside of the battery pack after disconnection and charging is improved. In some possible embodiments, the performing potential equalization on the first battery pack and the second battery pack in a case where the potential between the first battery pack and the second battery pack does not satisfy the equalization condition includes: Acquiring a charging current of the charging pile for charging the battery pack, a first internal resistance value of the first battery pack and a second internal resistance value of the second battery pack; and performing potential equalization on the first battery pack and the second battery pack in a case where it is determined that the potential between the first battery pack and the second battery pack does not satisfy the equalization condition, according to the charging current, the first internal resistance value, and the second internal resistance value. In this embodiment, according to the charging current, the first internal resistance value, and the second internal resistance value, when the electric potential between the first battery pack and the second battery pack does not satisfy the equalization condition, electromotive force equalization is performed on the first battery pack and the second battery pack, and consistency of the battery pack inside after the charging is disconnected is improved. In some possible embodiments, the performing potential equalization on the first battery pack and the second battery pack in a case where it is determined that the potential between the first battery pack and the second battery pack does not satisfy the equalization condition according to the charging current, the first internal resistance value, and the second internal resistance value includes: and under the condition that the charging current is larger than a preset current and the internal resistance difference between the first internal resistance value and the second internal resistance value is larger than a preset resistance value, determining that the potential between the first battery pack and the second battery pack does not meet the balance condition, and carrying out potential balance on the first battery pack and the second battery pack. In this embodiment, when the charging current is greater than the preset current and the internal resistance difference between the first internal resistance value and the second internal resistance value is greater than the preset resistance value, potential equalization is performed on the first battery pack and the second battery pack, so that consistency of the battery pack is improved. In some possible embodiments, the determining that the potential between the first battery pack and the second battery pack does not satisfy the equalization condition according to the charging current, the first internal resistance value, and the second internal resistance value includes: obtaining a potential difference between