Voltage acquisition method of battery pack and electric vehicle

A technology of voltage collection and battery packs, which is applied in the field of electric vehicles, can solve problems such as poor voltage consistency, alarm, and affect the accuracy of single voltage sampling, and achieve the effects of improving sampling accuracy, improving performance and life, and improving consistency

Pending Publication Date: 2021-08-13
宝能(广州)汽车研究院有限公司
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  • Abstract
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Problems solved by technology

Since the electrical connection using a conductor is not a perfect conductor, the conductor has a certain resistance value. When the battery pack has a working current, the conductor at the electrical connection position will have a partial voltage, which will affect the voltag

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  • Voltage acquisition method of battery pack and electric vehicle
  • Voltage acquisition method of battery pack and electric vehicle

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[0033] The technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the accompanying drawings only show some but not all of the parts related to the present invention.

[0034] In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. Fo...

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Abstract

The invention relates to the technical field of electric vehicles, in particular to a voltage acquisition method of a battery pack and an electric vehicle, and the acquisition method comprises the following steps that: S1, a resistance value R of a conductor electrically connected between a first module and a second module is determined; s2, a BMS collects the negative electrode potential of the single body located at the end of the first module, and the BMS collects the negative electrode potential of the single body located at the end of the adjacent second module; s3, when the battery pack is charged, the BMS collects the charging current I of the battery pack to obtain the charging voltage U1 of the single body at the end of the first module; and when the battery pack is discharged, the BMS collects the discharge current I' of the battery pack to obtain the discharge voltage U1' of the single body at the end of the first module. The sampling precision of the voltage of the single body can be improved, the consistency of the battery pack is improved, and therefore the use performance of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery pack voltage collection method and an electric vehicle. Background technique [0002] The internal cell voltage of the battery pack of an electric vehicle is generally sampled and monitored by the BMS (BATTERY MANAGEMENT SYSTEM). Usually, there are sampling lines connected to the positive and negative sides of the cell. The BMS identifies the voltage of the cell through the potential difference between the sampling lines. body voltage. The adjacent modules in the battery pack are electrically connected by conductors, and the voltage sampling of the cells located at the ends of the modules generally includes the electrical connection of the conductors between the modules. Since the electrical connection using a conductor is not a perfect conductor, the conductor has a certain resistance value. When the battery pack has a working current, the conductor at the e...

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Application Information

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IPC IPC(8): G01R31/3842G01R31/389
CPCG01R31/3842G01R31/389
Inventor 李碧雄吴水娇杨春雷
Owner 宝能(广州)汽车研究院有限公司
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