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Lithium battery pack balancing structure and method

A technology for lithium battery packs and battery packs, applied in charge equalization circuits, secondary batteries, battery circuit devices, etc., can solve problems such as complex working conditions, complex system structures, and complex external equipment, and achieve cost and space savings.

Inactive Publication Date: 2018-04-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The battery management system for electric vehicles has the characteristics of complex system structure, complex working conditions, and complex external equipment.

Method used

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  • Lithium battery pack balancing structure and method
  • Lithium battery pack balancing structure and method

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0027] figure 1 Shown is a schematic diagram of the balanced structure of the present invention. Lithium batteries are divided into N groups, namely BMSPACK 1-N. There are 7 batteries in each group, 5 of which are unique to this group, and the other 2 are shared with other groups. For example, in Group M, CellM1, CellM2, CellM3, CellM4, and CellM5 are unique to this group, Com(M-1)M is shared...

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Abstract

The present invention discloses a lithium battery pack balancing structure and a method. According to the structure and the method, by improving the balancing structure in a universal battery pack, alithium battery pack is divided into a plurality of packs, wherein each pack comprises a plurality of batteries. In each pack, the batteries are connected with a bi-directional DC / DC via a switch matrix, and another end of the bi-directional DC / DC is connected with both ends of the battery pack, so that the energy conversion between any battery in the pack and the pack is realized. Furthermore, between every two packs, a battery is shared by the two packs, and the shared battery can be balanced with other batteries in the two packs via intra-pack balancing of the two packs separately, so thattwo connected packs of batteries can be balanced. Because of the shared battery between every two packs, each battery pack can be balanced finally. The method can realize inter-pack balancing withoutadding inter-pack balancing structures, so that the method can save the cost and the space of inter-pack balancing circuits, and the structure is convenient for expanding.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage, and in particular relates to a lithium battery group equalization structure and method. Background technique [0002] As the power source of a car, batteries must be used in series to meet the voltage requirements. After multiple batteries are used in series for a period of time, the internal resistance and voltage of the batteries will fluctuate, and the state differences of the individual batteries will gradually appear, and the continuous cycle of charging and discharging will intensify. The inconsistency between single cells is eliminated. After the batteries are grouped, when charging and discharging at high power, the battery pack will generate heat and form a certain temperature gradient in the battery module, which will make the ambient temperature of each single battery inconsistent when it is working, which will weaken the consistency between the single cells and reduce t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44B60L11/18
CPCB60L58/22H01M10/441H02J7/0019Y02E60/10Y02T10/70Y02T10/92
Inventor 蒋建华王飘飘洪升平夏先龙李结胜李曦邓忠华
Owner HUAZHONG UNIV OF SCI & TECH
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