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Battery equalization method and device

A battery equalization and voltage equalization technology, applied in battery circuit devices, circuit devices, charge equalization circuits, etc., can solve the problems of low grouping rate and high capacity requirements for alternative batteries, and achieves higher grouping rate and wider capacity range. , the effect of reducing waste

Pending Publication Date: 2021-04-13
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the embodiment of the present invention, a battery equalization method and device are provided to solve the problem in the prior art that the capacity of the candidate battery is high and the grouping rate is low

Method used

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  • Battery equalization method and device
  • Battery equalization method and device

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Embodiment 1

[0062] This embodiment provides a battery balancing method, figure 1 It is a flowchart of a battery balancing method according to an embodiment of the present invention, such as figure 1 As shown, the method includes:

[0063] S101. Acquire voltage change rates of batteries in a battery pack.

[0064] At present, in the process of grouping, because the voltage rises slowly during the charging process of the large-capacity battery, and the voltage decreases slowly during the discharging process, it is not conducive to voltage balance. figure 2 It is the discharge curve of the large capacity battery according to the embodiment of the present invention, such as figure 2 As shown, during the discharge process of the large-capacity battery, the voltage drop rate is significantly lower than the average value of other batteries, image 3 It is the charging curve of the large capacity battery according to the embodiment of the present invention, such as image 3 As shown, during...

Embodiment 2

[0071] This embodiment provides another battery equalization method. Since the battery pack equalization process is not carried out in real time, the voltage of each battery needs to meet certain conditions before equalization can be performed. Therefore, before the voltage equalization operation is performed on the target battery, the above method also includes : judging whether the voltage value of the target battery satisfies the second preset condition; if yes, determine to perform a voltage equalization operation on the target battery; if not, determine not to perform a voltage equalization operation on the target battery. Specifically, judging whether the voltage value of the target battery satisfies the second preset condition includes: sorting the target batteries according to the voltage value; forming a battery pair with a battery with a positive sequence number N and a battery with a reverse sequence number N; Wherein, N is an integer greater than or equal to 1; judg...

Embodiment 3

[0077] This embodiment provides a battery balancing device, Figure 4 is a structural diagram of a battery balancing device according to an embodiment of the present invention, such as Figure 4 As shown, the battery balancing device includes:

[0078] The acquiring module 10 is configured to acquire the voltage change rate of the batteries in the battery pack.

[0079] At present, in the process of grouping, due to the slow rise of the voltage of large-capacity batteries during the charging process, the voltage drops slowly during the discharge process, so it is not conducive to voltage balance, as mentioned above figure 2 As shown in , during the discharge process of the large capacity battery, the voltage drop rate is significantly lower than the average value of other batteries, as mentioned above image 3 As shown, during the charging process of the large-capacity battery, the voltage rise rate is significantly lower than the average value of other batteries. Wherein,...

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Abstract

The invention discloses a battery equalization method and device. The battery equalization method comprises the following steps of: acquiring a voltage change rate of a battery in a battery pack; determining the battery of which the voltage change rate meets a first preset condition as a non-target battery, and determining the remaining battery as a target battery; and performing voltage equalization operation on the target battery. According to the battery equalization method and the device, the capacity range of the alternative batteries can be widened, the grouping rate is improved, the waste of the batteries is reduced, and the cost is reduced.

Description

technical field [0001] The present invention relates to the technical field of electronic power, in particular, to a battery equalization method and device. Background technique [0002] Batteries (such as lithium-ion batteries) are applied in groups and modules in electric vehicles, energy storage fields and other occasions that require large amounts of energy. [0003] Due to the differences between each battery, if there is no external equalization treatment, the battery will be overcharged and overdischarged during continuous use in the later stage, which will affect the service life of the battery system and pose a safety hazard to the battery system. Therefore, when the battery pack is working, equalization processing is generally performed. Currently, a battery management system (BMS) is generally used to perform equalization processing to improve the consistency of battery modules. The equalization method is generally divided into active equalization and passive eq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 钟宽刘霞王春阳赖元华
Owner GREE ELECTRIC APPLIANCES INC
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