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Active equalization charging device and method of power battery

An active equalization and charging device technology, which is applied in the fields of electric vehicles, power electronics, and automation, can solve the problems of adjacent and non-adjacent equalization charging of batteries, and that active equalization devices cannot perform two-way equalization charging at the same time, so as to reduce the equalization time, The effect of improving energy transfer efficiency and increasing parallel rate

Active Publication Date: 2021-04-13
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

[0004] The present invention provides an active equalization charging device and method for a power battery. Adjacent and non-adjacent equalization charging issues

Method used

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  • Active equalization charging device and method of power battery
  • Active equalization charging device and method of power battery
  • Active equalization charging device and method of power battery

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with accompanying drawing.

[0031] The invention includes a main controller, a battery management system (BMS), n equalizing charging modules, n transmission bus isolating switches, and two charge transmission buses B+ and B-. The main controller is used to receive the BMS to estimate the SOC value of the corresponding battery cell, calculate the battery cell that needs to be balanced through the balancing control strategy, and send a driving signal to the balancing charging module and the transmission bus isolation switch Q.

[0032]The battery management system obtains the voltage and current of the battery cells through sampling. The battery management system has built-in battery SOC-voltage curves for different charging times, and records the charging times of the battery cells. The initial value of SOC corresponding to each battery cell is obtained by the number of times, and the SOC value of eac...

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Abstract

The invention provides an active equalization charging device and method for a power battery, and aims to solve the problems that an active equalization device cannot perform bidirectional equalization charging, grouping equalization charging and battery adjacent and non-adjacent equalization charging at the same time. The system comprises a main controller, a battery management system (BMS), n equalization charging modules, n battery cells, n transmission bus isolation switches, and two charge transmission buses B+ and B-. According to the device, battery cell grouping parallel equalization, charge bidirectional, adjacent and non-adjacent transmission, energy leap type transmission and no equalization overlapping problem can be realized, the equalization effect is good, the expansion is easy, and the circuit is easy to realize. In addition, the direct non-adjacent charge transfer maintains the service life of the intermediate battery by reducing the charge-discharge period of the intermediate battery and minimizing the loss caused by the number of charge transfer steps, and the energy transfer efficiency of the equalization process is also improved.

Description

technical field [0001] The invention relates to the technical fields of electric vehicles, power electronics and automation, in particular to an equalizing charging device and method for charging and maintaining battery packs of electric vehicles. Background technique [0002] The usable capacity of the series battery pack is affected by the change of the state of charge (SOC) of each battery, because the inconsistency of the battery due to the different equipment, process and materials used in the manufacturing process of lithium-ion batteries , the inconsistency of the battery seriously affects the working performance of the battery pack, and the barrel effect will occur during the charging and discharging process of the battery, which requires battery equalization, but the challenge now shifts to the electrical structure design and equalization method of the battery active equalization device . [0003] None of the existing equalization devices can simultaneously perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/22B60L58/12H02J7/00
CPCB60L58/22B60L58/12H02J7/0014Y02T10/70
Inventor 王双张尧张帆孔亚广赵晓东陈张平郑小青黄娜何中杰
Owner HANGZHOU DIANZI UNIV
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