A vehicle power battery equalization method, device and vehicle

A technology of power battery and equalization method, which is applied in the direction of battery circuit devices, battery/fuel cell control devices, electric vehicles, etc., can solve the problems of low equalization efficiency and inapplicability, so as to improve the equalization effect, increase the usable capacity, The effect of good vehicle dynamic index

CN110682831BActive Publication Date: 2021-05-14GAC AION NEW ENERGY AUTOMOBILE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-05-14

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Abstract

The invention provides a vehicle-mounted power battery equalization method, device, and automobile. The method first determines the start-up battery equalization according to the sleep time of the automobile and the battery charge and discharge current value; then determines the battery cell with the lowest voltage, and obtains other battery cells and The voltage difference information of the battery cell with the lowest voltage; and the balance information of the battery cells in each battery module is determined according to the pressure difference information; finally, the battery balance is performed according to the balance information of the battery cells. Furthermore, the device is used to carry out the method, the motor vehicle comprising the device. The method, device and automobile of the invention solve the technical problem that the charging equalization scheme of the whole vehicle is not applicable to HEV, and improve the working efficiency of battery equalization.
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Description

technical field

[0001] The invention relates to the technical field of batteries, in particular to a method and device for equalizing a vehicle-mounted power battery and an automobile. Background technique

[0002] The vehicle power battery includes several battery modules, and each battery module is composed of battery cells connected in series and parallel. Due to the consistency of the battery cells in terms of use, temperature, and impedance, the voltage will vary in actual use. The emergence of this inconsistency shortens the life of the vehicle's power battery, and the balancing function of the battery management system (Battery Management System, BMS) is to eliminate the voltage difference between the battery cells. Then, the existing technology is to choose the charging equalization scheme of the whole vehicle, that is, when the battery management system enters the battery charging mode, the opening and closing of the discharging circuit is changed according to the r...

Examples

Embodiment Construction

[0054]The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented.

[0055] Such as figure 1 Shown is a flow chart of a vehicle power battery equalization method provided by the embodiment of the first aspect of the present invention, and the method includes the following steps:

[0056] S100 determines to start battery equalization according to the sleep time of the car and the battery charge and discharge current value;

[0057] S200 Determine the battery cell with the lowest voltage, and obtain information about the voltage difference between other battery cells and the battery cell with the lowest voltage;

[0058] S300 Determine the balance information of the battery cells in each battery module according to the pressure difference information;

[0059] The S400 performs battery balancing based on the balancing information of battery cells.

[0060] Specificall...