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Lithium battery pack equalization method and system

A lithium battery pack and battery technology, which is applied in charge balancing circuits, batteries, secondary batteries, etc., can solve the problems of complex system structure, complex working conditions, and complex external equipment.

Active Publication Date: 2019-11-22
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 equalization method and system
  • Lithium battery pack equalization method and system
  • Lithium battery pack equalization method and system

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Embodiment Construction

[0030] 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.

[0031] The invention discloses a battery equalization efficiency optimization method, which can optimize and obtain the best target average state of charge value of the battery pack for dynamic equalization, so that the battery management system can efficiently realize the state of charge of each battery in the shortest time Consistency and balance. A lithium battery pack contains several batte...

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Abstract

The invention discloses a battery equalization efficiency optimization method and system, and belongs to the technical field of batteries. One battery pack comprises a plurality of batteries, the charge states of the batteries are inconsistent, energy transfer needs to be carried out to enable the charge states of the batteries to tend to be consistent, and the charge states of the batteries are changed in real time in the energy transfer process, so that in each equalization process, the optimal charge state is used as an equalization target, and the target battery can reach a target equalization value through equalization. After the equalization is finished, the optimal charge state of next equalization is calculated according to the latest charge state of each battery, and the system can quickly achieve the target that the charge states of the batteries are consistent in an allowable error range in the shortest time in the process of continuously repeating the above process, so thatthe energy transfer efficiency of the equalization system is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage, and in particular relates to a method and system for equalizing a lithium battery pack. 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): H01M10/42H01M10/44H01M10/46H01M10/48H02J7/00B60L58/13B60L58/22
CPCB60L58/13B60L58/22H01M10/4207H01M10/425H01M10/441H01M10/446H01M10/46H01M10/482H01M2010/4271H01M2220/20H02J7/0014H02J7/0018Y02E60/10Y02T10/70
Inventor 蒋建华夏先龙李曦邓忠华李结胜
Owner HUAZHONG UNIV OF SCI & TECH