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A voltage equalization circuit of a series battery pack and its working method

A technology of voltage equalization circuit and series battery pack, which is applied in the direction of circuit, secondary battery, secondary battery repair/maintenance, etc. It can solve the problems of energy loss, high cost, and complicated circuit, so as to improve efficiency, reduce volume, and circuit The effect of simple structure

Active Publication Date: 2020-04-21
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For now, battery equalization methods mainly include parallel resistor shunt method, external power supply equalization method, Buck-Boost equalization method, etc. These methods often lose part of the energy due to conversion efficiency problems during voltage conversion, and some circuits are more complicated. ,higher cost

Method used

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  • A voltage equalization circuit of a series battery pack and its working method
  • A voltage equalization circuit of a series battery pack and its working method
  • A voltage equalization circuit of a series battery pack and its working method

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment provides a voltage equalization circuit for series-connected battery packs. The voltage equalization circuit includes a battery pack B formed by connecting n battery cells in series. 1 -Bn; 2n+2 balanced controllable switches and 4 charge-discharge switchable controllable switches, the specific circuit connection relationship is as follows figure 1 Shown. Among them, 2n+2 balanced controllable switches are used to connect or disconnect the battery cells or battery packs, and are divided into odd and even groups. The 4 charge-discharge switchable controllable switches are charge-discharge switchable controllable switches K 1 , Charge and discharge switch controllable switch K 2 , Charge and discharge switch controllable switch K 3 And charge and discharge switch controllable switch K 4 , A capacitor C 1 And an inductor L 1 . Among them, battery B 1 -The anode of Bn is connected to two balanced controllable switches, and the cathode...

Embodiment 2

[0030] Such as figure 2 As shown, figure 2 Is the single cell B of the present invention 1 Discharge, capacitor C 1 The energy storage process. When the equalization controller detects that the single battery needs to be discharged, use battery B 1 Discharge to B 2 Take for example. First turn on the balance control switch S 1 , S 4 And charge and discharge switch controllable switch K 1 , K 4 , At this time battery B 1 Via inductor L 1 With capacitor C 1 Connected, under the current limit of the inductor, the battery starts to charge the capacitor.

[0031] Such as image 3 As shown, image 3 It is a single battery B 1 After discharge, capacitor C 1 Give battery B after energy storage 2 The process of charging. At this time, turn off the switch during charging and turn on the balance controllable switch S 4 , S 5 And charge and discharge switch controllable switch K 2 , K 3 . At this time, battery B 2 Via inductor L 1 With capacitor C 1 Connection, because the voltage across ...

Embodiment 3

[0033] Such as Figure 4 As shown, Figure 4 Is the multi-cell battery of the present invention (with B 1 , B 2 For example) discharge, capacitor C 1 Energy storage process. Close balance controllable switch S 1 , S 6 And charge and discharge switch controllable switch K 1 , K 4 , Then battery B 1 , B 2 Discharge, the capacitor stores energy. This figure illustrates the discharge process of multiple batteries.

[0034] Such as Figure 5 As shown, Figure 5 Is a multi-cell battery (with B 1 , B 2 For example) after discharge, capacitor C 1 After energy storage, give multiple batteries (with B 3 , B 4 For example) the charging process. Disconnect the switch when charging, open the balance controllable switch S 6 , S 9 And charge and discharge switch controllable switch K 2 , K 3 , The capacitor starts to move towards B 3 , B 4 Recharge. This figure illustrates how the capacitor charges multiple batteries.

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Abstract

The invention relates to a voltage balance circuit of a serially connected battery pack and a working method of the voltage balance circuit. The voltage balance circuit comprises a capacitor and a sensor, wherein the capacitor and the sensor are serially connected and are further connected with four charge / discharge switching controllable switches; the four charge / discharge switching controllable switches form four bridge arms of an H-shaped energy-storage circuit; two poles of n (n is greater than or equal to 2) single batteries are respectively connected with switch groups; each switch group consists of two balance controllable switches; one balance controllable switch of each switch group is connected with one end of the H-shaped energy-storage circuit; and the other balance controllable switch of each switch group is connected with the other end of the H-shaped energy-storage circuit. By adopting the voltage balance circuit, lossless transfer of energy is achieved; the voltage balance circuit is simple in structure, batteries of any relatively high energy can be converted into batteries of low energy, and the energy does not need to be transferred in a specific sequence grade by grade; and in addition, the circuit is free of a transformer, a DC-DC (Direct Current-Direct Current) converter and the like, so that the volume of the circuit is reduced, and the efficiency is improved.

Description

Technical field [0001] The invention relates to a voltage equalization circuit of series battery packs and a working method thereof, and belongs to the technical field of battery equalization control and management. Background technique [0002] In today's society, environmental pollution and energy crises are becoming increasingly prominent. New energy technologies are developing rapidly, and more and more products use batteries as power. In some areas with high power supply voltage requirements, such as electric vehicles, the voltage of a single battery often does not meet the power supply requirements. Therefore, several batteries are usually connected in series to form a battery pack for use. However, due to the manufacturing process, the unbalanced capacity, internal resistance, voltage, etc. of each single battery or the influence of external temperature, humidity and other environmental factors will cause inconsistencies between the single batteries during use, and this in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/46H01M10/48
CPCH01M10/4207H01M10/425H01M10/4264H01M10/46H01M10/482H01M10/486H01M2010/4271Y02E60/10
Inventor 孙秀娟祝令阵陆新秀张鹏飞邱文龙林孟昌杨茁卞晓雪王传江
Owner SHANDONG UNIV OF SCI & TECH
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