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Multi-module cascading balancing method for cells

An equalization method and multi-module technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as backward consistency evaluation methods and limited number of equalized batteries

Inactive Publication Date: 2014-03-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of backward consistency evaluation methods in the prior art and the limited number of balanced batteries in a single equalization circuit, and propose a battery equalization method

Method used

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] figure 1 It is the working principle diagram of multi-module cascading.

[0021] Such as figure 1 As shown, the multi-module cascaded battery pack of the present invention includes a battery 1 , a balance circuit group 2 and a CAN bus communication line 3 . Equalization circuit group 2 includes M equalization circuits, M is represented by a real integer, the value of M is related to the total number of batteries, and also related to the number of batteries that each equalization circuit can manage. The sum of the number of batteries managed by all equalization circuits is equal to the battery 1 quantity. The single batteries in battery 1 are grouped according to the number of batteries managed by the balancing circuit, and the number of groups is M, which is the same as the number of balancing circuits in balancing circuit group 2 . ...

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Abstract

The invention belongs to the technical field of battery systems and relates to a multi-module cascading balancing method for cells. According to the method, unit cells are divided into groups; each group of unit cells is connected with a balancing circuit; each balancing circuit is provided with a bus communication interface; a plurality of balancing circuits are connected to form a communication local area network by buses; a certain balancing circuit is determined as a host; other balancing circuits are determined as slaves; the slaves report information of the unit cells managed by the slaves to the host by the buses; the host calculates modes of all the unit cells according to the mode principle-based cell uniformity evaluation method; and the same mode space is used as the standard to determine an object to be balanced and calculate balancing parameters. According to the invention, a plurality of balancing circuits are utilized to manage massive unit cells; the balancing circuits are communicated with each other by the buses; and the module cascading of a plurality of balancing circuits is implemented and the expansion of balancing ability is achieved.

Description

technical field [0001] The invention relates to a battery multi-module balancing method. technical background [0002] The battery pack is generally composed of multiple single cells connected in series and parallel. Unlike the occasion where only a single battery is used, the performance of the entire battery pack depends not only on the performance of each single cell in the battery pack, but also on the Consistency among all cells in a battery pack. The performance of the battery pack, including the maximum charge and discharge current, maximum energy storage limit, service life, safety and other main indicators, does not depend on the single battery with the best performance state, but depends on the single battery with the worst performance state. Therefore, the performance of the battery pack has a "barrel effect". The single battery with poor consistency is the "short board" of the battery pack and becomes the "bottleneck" of the performance of the battery pack. The ...

Claims

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Application Information

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IPC IPC(8): H01M10/42G01R31/36
CPCH01M10/425H01M2010/4271H01M2010/4278Y02E60/10
Inventor 宫学庚张少昆舒恩
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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