Grading method for cascade utilization of power battery of electric vehicle

A power battery and grading method technology, which is applied in the battery field and can solve problems such as inability to evaluate battery health status

Active Publication Date: 2012-05-02
CHINA ELECTRIC POWER RES INST +1
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  • Description
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Problems solved by technology

The external characteristic parameters of the battery can only reflect the changes of some of its main parameters, and cannot reflect the factors that cause battery performance degradation from the internal mechanism, so it cannot accurately evaluate the battery health status

Method used

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Embodiment Construction

[0023] A grading method for cascaded utilization of electric vehicle power batteries, characterized in that the grading method includes the following steps:

[0024] (1). Analyze the external characteristics of the cascade utilization power battery to determine whether the power battery can be used in cascade utilization;

[0025] (2). For batteries that can be used in stages, conduct preliminary classification according to their external characteristic parameters, and then conduct sampling internal characteristic analysis for batteries of each level;

[0026] (3). On the basis of internal and external characteristic analysis, establish the relationship between internal and external characteristic parameters, and evaluate the health status of the battery;

[0027] (4). Combining the evaluation results of the battery health status with the use conditions of the battery, classify the cascade utilization power battery;

[0028] Wherein, in the step 4, the usage conditions of the...

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Abstract

The invention provides a grading method for the cascade utilization of a power battery of an electric vehicle. The grading method comprises the following steps of: (1) performing external characteristic analysis on the cascade-utilized power battery, and judging whether the cascade utilization of the power battery can be realized or not; (2) primarily grading the battery on which the cascade utilization can be performed according to external characteristic parameters of the battery, and performing sampled internal characteristic analysis on the battery of each grade; (3) establishing incidence relations between internal and external characteristic parameters based on the internal and external characteristic analysis, and evaluating the health status of the battery; and (4) grading the cascade-utilized power battery by combining a health status evaluation result of the battery and the using conditions of the battery. By the grading method for the cascade utilization of the power battery of the electric vehicle, the performance of the battery not only can be ensured to meet the requirements of application occasions, but also can be fully utilized.

Description

technical field [0001] The invention belongs to the field of storage batteries, and in particular relates to a classification method for cascade utilization of power batteries of electric vehicles. Background technique [0002] Electric vehicles have high requirements on the performance of the power battery. When the capacity of the power battery drops to a certain level, in order to ensure the power performance, driving range and safety performance of the electric vehicle, it must be replaced. The battery replaced from the electric vehicle still has a high residual capacity. Lithium-ion batteries have the advantages of high specific energy, good temperature characteristics, and long cycle life. After being decommissioned as electric vehicle power batteries, after screening and regrouping, they may be used in relatively good working conditions and relatively low requirements for battery performance. In some cases, the step-by-step utilization of the power battery is realize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCH01M2220/20Y02E60/12H01M10/04G01R31/3641H01M10/42G01R31/00H01M2010/4278G01R31/3634G01R31/3865G01R31/387Y02E60/10
Inventor 郭剑波刘道坦王松岑范茂松
Owner CHINA ELECTRIC POWER RES INST
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