Lithium battery voltage balance circuit topology

A voltage equalization circuit, lithium battery technology, applied in charge equalization circuits, battery circuit devices, circuit devices, etc., can solve the problems of low equalization efficiency, difficult to determine equalization time, complex equalization strategy, etc. Simple effect of topology control algorithm

Inactive Publication Date: 2016-09-21
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a lithium battery voltage equalization circuit topology to solve the problems of low equalization efficiency, complex equalization strategy, difficult to determine equalization time and inability to bypass faulty batteries in traditional battery equalization circuits

Method used

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  • Lithium battery voltage balance circuit topology
  • Lithium battery voltage balance circuit topology
  • Lithium battery voltage balance circuit topology

Examples

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Embodiment 1

[0036] Example 1: as figure 1 As shown in the figure, a lithium battery voltage equalization topology according to the present invention is composed of a lithium battery and an N-channel MOSFET tube, and four MOSFET tubes are connected in parallel at both ends of each lithium battery, wherein the two MOSFETs of the upper bridge arm use the same driving signal , a pair of MOSFETs on the lower bridge arm use the same drive signal, that is, the two switches on the upper and lower bridge arms are on and off at the same time. When the upper bridge arm S 1 and S 2 Open at the same time, the lower bridge arm S 3 and S 4 When turned off at the same time, the corresponding lithium battery is connected to the main circuit; when the upper bridge arm S 1 and S 2 Turn off at the same time, the lower bridge arm S 3 and S 4 When turned on at the same time, the corresponding lithium battery bypass; when the upper bridge arm S 1 and S 2 Turn off at the same time, the lower bridge arm ...

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Abstract

A lithium battery voltage equalization circuit topology belongs to the voltage equalization circuit topology. The lithium battery is connected in parallel with two pairs of anti-series MOSFET tubes, and the switching status of the anti-series MOSFET tubes of the upper and lower bridge arms is controlled to realize the connection or bypass of the lithium battery or lithium battery pack to the main circuit. In the process of charging and discharging, according to the terminal voltage of the lithium battery or the terminal voltage of the lithium battery group, the two pairs of MOSFET switch tubes of the upper and lower bridge arms are controlled to be turned on or off, thereby changing the flow path of the charging and discharging current, and finally maintaining the terminal voltage of each lithium battery. The purpose of equalization, and greatly increase the available capacity of the battery pack, reduce the impact of conventional equalization schemes on the life of lithium batteries. When a certain section or a group of lithium batteries is detected to be faulty, the state of the control switch tube will bypass the faulty battery or battery pack, forcing the faulty battery to be separated from the main circuit, while other lithium batteries can still continue to work normally. It provides reliable protection for the safe work and personal safety of the package.

Description

technical field [0001] The invention relates to a voltage equalization circuit topology, in particular to a lithium battery voltage equalization circuit topology. Background technique [0002] In recent years, electric vehicles have developed rapidly, but the capacity and voltage of lithium batteries seriously restrict their cruising range. The series-parallel combination of a large number of lithium batteries can greatly improve the battery capacity and voltage, but due to the inconsistency of the internal resistance of the battery, during the charging and discharging process of the battery, some batteries will be fully charged while others are not fully charged, or some batteries may not be fully charged. The working condition that the battery is discharged first and other batteries have remaining power, resulting in low capacity utilization of the battery pack, and some capacity is not used. When this situation is serious, the battery will be overcharged or overdischarge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 周娟刘刚戴鹏贺鹏飞化毅恒王江彬汪慧敏龙宪磊赵晨张永磊任国影毛海港
Owner CHINA UNIV OF MINING & TECH
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