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An equalization method for a modular battery pack system

A technology of modular battery and equalization method, which is applied in battery/fuel cell control devices, electric vehicles, transportation and packaging, etc. It can solve the problems of short cruising range, limited flexibility and convenience of battery replacement mode, and complex battery replacement process, etc. Problems, to achieve the effect of automatic equalization, convenient and quick quick change function

Active Publication Date: 2020-05-26
SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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Problems solved by technology

[0002] For electric vehicles, the battery replacement mode can solve the problem of short mileage and long charging time of electric vehicles through the detachable battery; however, most of the current battery replacement modes of electric vehicles are to replace the entire power battery. It must rely on special mechanical devices for operation and implementation, which limits the flexibility and convenience of battery replacement mode

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  • An equalization method for a modular battery pack system
  • An equalization method for a modular battery pack system

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] In electric vehicles with large power consumption and high power requirements, the power battery is usually designed as a modular battery pack, and the modular battery packs are combined for power supply. With the use of modular battery packs, there may be a voltage difference between some modular battery packs and other modular battery packs. This solution realizes the automatic equalization of the modular battery pack system through the cooperation of relays and balancing resistors.

[0018] Such as figure 1 As shown, an equalization method for a modular battery pack system, step 1, using BMS to detect the voltage V at both ends of N battery packs respectively BAT1 , V BAT2 …V BATN , the battery pack is composed of multiple modular battery packs connected in series, and judging V BAT1 , V BAT2 …V BATN Whether the voltage difference between any two voltag...

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Abstract

The invention relates to the technical field of battery balancing, and discloses a balancing method of a modularized battery pack system. The voltages VBAT1, VBAT2...VBATN at the two ends of each of a plurality of battery packs are detected by adopting a battery management system (BMS), and whether the dropout voltage between any two voltages is zero or not is judged; if yes, the BMS controls first relays which are connected with the battery packs in series correspondingly to be closed, and electrifying is completed; and if not, second relays connected with the first relays in parallel are arranged, according to the low-to-high sequence of the voltages of the battery packs, the BMS sequentially sends instructions to control all the second relays to be closed and adjusts the resistance of loops where the second relays and the battery packs are located, voltage balancing among the battery packs is achieved, then the BMS sends a switch-off instruction to the second relays and then sends a closing instruction to the first relays, and electrifying is completed. Automatic balancing of the battery pack system formed by the modularized battery packs is achieved. The invention further discloses a balancing system of the modularized battery pack system.

Description

technical field [0001] The invention relates to the technical field of battery equalization, in particular to a method for equalizing a modular battery pack system. Background technique [0002] For electric vehicles, the battery replacement mode can solve the problem of short mileage and long charging time of electric vehicles through the detachable battery; however, most of the current battery replacement modes of electric vehicles are to replace the entire power battery. It must rely on special mechanical devices for operation and implementation, which limits the flexibility and convenience of the battery replacement mode. By designing the power battery into a modular small battery pack, not only can the battery quick change process be conveniently operated manually, but also it can be conveniently used in stages after the power battery is decommissioned. The power battery is designed as a modular small battery pack, and the balance of the modular battery pack becomes a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/10B60L58/22
CPCB60L58/10B60L58/22Y02T10/70
Inventor 肖伟陈家良康权何岸阳应奎朱启佳舒小农
Owner SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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