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BMS (battery management system) balance control method

A balanced control and balanced technology, applied in the direction of secondary battery charging/discharging, electrochemical generators, electrical components, etc., can solve problems that do not meet customer needs, achieve simple and efficient strategies, improve accuracy and precision, and improve consistency sexual effect

Inactive Publication Date: 2014-01-22
HUIZHOU EPOWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the balance current of BMS has a tendency to increase continuously. Small current balance does not meet customer needs, and large current balance is an inevitable trend.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0011] In order to allow those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below.

[0012] The invention discloses a BMS balance control method. Due to the influence of external factors at the moment when the BMS turns on the balance of the battery pack, the cell voltage of the balanced battery will jump, and the voltage measured twice before and after the moment of equalization will have an obvious difference (that is, the voltage drop of the wiring harness), so Before the BMS is turned on to balance the battery pack, at least one detection is performed and the voltage value U1 of each battery cell in the battery pack is recorded; when the BMS is turned on to balance the battery pack, the instantaneous voltage value of each battery cell after the equalization is turned on is measured respectively U2; U2-U1 is the harness voltage drop value.

[0013] Due to the voltage drop of the wi...

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PUM

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Abstract

The invention discloses a BMS (battery management system) balance control method comprising the following steps: (1) performing detection for at least one time and recording the voltage value U1 of each battery unit in a battery pack before balancing on the battery pack is started by a BMS; (2) measuring the instantaneous voltage value U2 of each battery unit after balancing stating when the balancing on the battery pack is started by the BMS; (3) measuring the real-time measurement voltage value U3 of each battery unit during balancing; (4) correcting the real-time voltage of each battery unit according to the measured U1, U2 and U3 of the corresponding battery unit to obtain the real-time voltage U4 of each battery unit; (5) judging whether the balancing operation is required to be ended or not according to the real-time voltage U4 of each battery unit. The BMS balance control method disclosed by the invention improves the accuracy and the precision of voltage detection during the balancing, improves the consistency of the battery units and reduces the cost, and the harness wiring of the BMS is relatively concise.

Description

technical field [0001] The invention relates to a BMS equalization control method. Background technique [0002] The electric vehicle power battery is composed of multiple batteries in series. Due to the inconsistency between the battery cells, the voltages after charging cannot be completely consistent, so the BMS is required to balance the battery pack. As the market has higher and higher requirements for equalization speed and equalization time, it is required to use a larger current for charging equalization. However, when using a large current for equalization, the sampling wiring harness will produce a voltage drop. This voltage drop cannot be ignored. For the voltage detection value Accuracy is affected. [0003] The voltage value of a single cell is an important parameter for BMS detection. At present, BMS has gradually added the equalization function, and the customer requires a shorter equalization time, which will inevitably lead to an increase in the equalizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/4207Y02E60/10
Inventor 刘飞文峰阮旭松谢小科
Owner HUIZHOU EPOWER ELECTRONICS
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