Fast charging method and related equipment for parallel battery pack
A fast charging and battery pack technology, applied in battery circuit devices, arrangement of multiple synchronous batteries, parallel conversion of batteries, etc., can solve problems such as longer charging time, and achieve the effect of avoiding excessive charging current
Active Publication Date: 2020-01-10
HUAWEI TECH CO LTD
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Problems solved by technology
[0003] Embodiments of the present invention provide a fast charging method, fast charging system and device for parallel battery packs to solve the problem that the charging time becomes longer because the charging current required for charging parallel battery packs is greater than the maximum charging current allowed by the charging main circuit , to improve the charging speed and efficiency of parallel battery packs
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[0091] Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0092] For devices powered by rechargeable batteries, such as electric vehicles, in order to obtain higher current output and faster charging speed, the battery pack is usually composed of multiple battery cells connected in parallel. When charging a battery pack connected in parallel, the maximum charging current required by the entire battery pack is the sum of the maximum charging currents of all battery units participating in the parallel connection. The charging current will cause the charging current distributed to each battery unit to fail to reach the highest charging rate of the battery unit, thereby limiting the charging speed of the entire battery pack. In the embodiment of the present invention, for the problem of long charging time for parallel battery packs, by comparing the maximum charging current allowed by the charging main circuit with the chargin...
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An embodiment of the present invention provides a fast charging method for parallel battery packs, comprising: obtaining the maximum charging current allowed by the charging main circuit and the charging current required for charging the parallel battery packs; comparing the charging current required for charging the parallel battery packs with the The size of the maximum charging current allowed by the charging main circuit; if the charging current required for charging the parallel battery pack is less than or equal to the maximum charging current allowed by the charging main circuit, then perform parallel charging on the battery cells; if If the charging current required for charging the parallel battery pack is greater than the maximum charging current allowed by the charging main circuit, part or all of the battery cells in the parallel battery pack are converted into series connections, and the battery cells are executed Series charging. In addition, the embodiment of the present invention also provides a fast charging system and a fast charging device for parallel battery packs. The fast charging method of the parallel battery pack can effectively shorten the charging time.
Description
technical field [0001] The invention relates to the technical field of fast charging of batteries, in particular to a fast charging method for parallel battery packs and related equipment. Background technique [0002] Power lithium-ion batteries have the advantages of high nominal voltage, large specific energy, high charge and discharge efficiency, and long life. At present, they are widely used in electric vehicles and battery energy storage. At the same time, the battery needs to be connected in parallel to a certain capacity level to meet the voltage and power requirements. The battery pack is generally composed of dozens to hundreds of single cells connected in series or first connected in parallel and then connected in series. For parallel battery packs, since the maximum charging current required is the sum of the maximum charging currents of all single cells participating in parallel connection, the charging time can be effectively shortened. However, the excessive...
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IPC IPC(8): H02J7/00
CPCH02J7/0024H02J7/00304H02J7/02
Inventor 李英涛周岿王强张光辉王平华
Owner HUAWEI TECH CO LTD