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Battery pack active equalization method by using multi-layer equalization circuit

A balancing circuit and active balancing technology, applied in charge balancing circuits, arrangement of multiple synchronous batteries, electric vehicles, etc., can solve problems such as cost increase, balancing module burning, unreasonable heat dissipation, etc., to save energy and reduce life consumption too fast effect

Inactive Publication Date: 2017-10-20
WINNERWAY MOTORS CO LTD
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  • Claims
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Problems solved by technology

However, since the equalization process is to convert electric energy into heat energy, corresponding cooling equipment must be configured in the heat dissipation process, which greatly increases the cost in industrial production and converts electric energy into heat energy will cause unnecessary power waste; in addition, if heat dissipation If it is unreasonable, it will cause the temperature of the entire battery combination equalization module to be too high, resulting in accelerated decay of the battery and the consequence of burning out the equalization module

Method used

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  • Battery pack active equalization method by using multi-layer equalization circuit
  • Battery pack active equalization method by using multi-layer equalization circuit
  • Battery pack active equalization method by using multi-layer equalization circuit

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0027] Embodiments of the present invention provide a method for actively balancing a battery pack using a multi-layer balancing circuit. The battery pack includes a plurality of battery cells connected in series, and each layer of the balancing circuit in the multi-layer balancing circuit includes at least A balancing unit, each balancing unit includes two controllable switches connected in series and an inductor, the two controllable switches connected in series are connected to both ends of at least two battery cells connected in series among the plurality of battery cells, and the inductor is connected Between the node between the two controllable switches a...

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Abstract

The invention relates to the field of batteries and discloses a battery pack active equalization method by using a multi-layer equalization circuit. The battery pack comprises a plurality of battery units connected in series. Each layer of the multi-layer equalizing circuit includes at least one equalization unit connected in series. Each equalization unit includes two controllable switches connected in series and one inductor. The two controllable switches connected in series are connected to both ends of at least two battery units of the plurality of battery units. The inductor is connected between a node between the two controllable switches and an intermediate node of the at least two battery units. The intermediate node divides the at least two battery units into two battery unit groups with the same number of battery units. The method comprises steps of: detecting the voltage across each of the battery units; receiving the detected voltage across each of the battery units; and controlling the multi-layer equalization circuit layer by layer based on the voltage in order to perform a voltage equalization operation.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for actively balancing a battery pack by using a multilayer balancing circuit. Background technique [0002] In the field of electric power, lithium batteries have gradually become the mainstream power source for electric vehicles, energy storage and communication backup power due to their advantages such as high energy density, small size, and environmental protection. [0003] In actual use, lithium batteries are in the form of battery packs. However, during the production of lithium batteries, there will inevitably be small performance differences due to factors such as the environment and production machines, which leads to the fact that each lithium battery in the lithium battery pack may have different voltage values ​​for each battery. After repeated use, the voltage difference of these batteries will gradually increase. If equalization is not performed in time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 徐清宋涛张勃兴刘营涛曾广闽
Owner WINNERWAY MOTORS CO LTD
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