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Battery state discrimination method based on battery management system

A technology of battery management system and battery status, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of improving operation safety

Active Publication Date: 2015-11-25
CALB CO LTD
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Problems solved by technology

[0004] The present invention provides a battery status discrimination method based on a battery management system to solve the problem of estimating the battery status in applications

Method used

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Embodiment Construction

[0032] The technical solution of the present invention will be described in detail in conjunction with the accompanying drawings.

[0033] Such as figure 2 As shown, the battery state discrimination method based on the battery management system is: obtain the voltage value of the single battery during charging and discharging, and judge the speed of the voltage rise and fall of the single battery:

[0034] If the voltage of a single cell rises faster during charging and reaches the cut-off voltage of charging first, and when discharging, the voltage of the single cell drops faster and reaches the cut-off voltage of discharge first, then the internal resistance of the single cell is relatively large. The single battery is in state one;

[0035] If the open-circuit voltage of a single battery is low, the voltage of the single battery drops quickly when discharging, and reaches the discharge cut-off voltage first, while the voltage of the single battery rises slowly when chargi...

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Abstract

The invention relates to a battery state discrimination method based on a battery management system. Through acquiring a voltage value of a single cell in the case of charging and discharging, the voltage rising and falling speed of the single cell is judged, if the voltage of the single cell in the case of charging rises fast and the voltage of the single cell in the case of discharging falls fast, the single cell has large internal resistance; if the open circuit voltage of the single cell is low, the voltage of the single cell falls fast in the case of discharging and the voltage of the single cell rises slowly in the case of charging, power of the single cell is low; and if the open circuit voltage of the single cell is high, the voltage of the single cell rises fast in the case of charging and the voltage of the single cell falls slowly in the case of discharging, power of the single cell is high. The method realizes estimation on the battery state in application, and battery operation safety is improved.

Description

technical field [0001] The invention belongs to the technical field of battery management systems, and in particular relates to a battery state discrimination method based on the battery management system. Background technique [0002] With the application requirements of new energy electric vehicles and photovoltaic energy storage technology, the battery management system, as an indispensable part of the new energy industry, has the functions of single battery voltage acquisition, charge and discharge current acquisition, battery temperature acquisition and acquisition data storage. In the application of electric vehicles and energy storage technology, the battery pack is composed of dozens or even hundreds of single cells in series. A prominent problem in the use of the battery pack is the inconsistency between the single cells, and the battery with poor performance It plays a decisive role in the charge and discharge capacity of the battery pack, and using a battery with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 田云芳薄丽丽王栋梁王蕾宾玲
Owner CALB CO LTD
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