A method for recycling a power battery

A power battery and battery technology, which is applied in the direction of secondary battery repair/maintenance, electricity measurement, and electric variable measurement. It can solve the problems of large battery inconsistency, strong battery discreteness, unsuitable screening and grouping methods, etc. To achieve the effect of prolonging service life and improving consistency

Active Publication Date: 2015-09-23
STATE GRID CORP OF CHINA +2
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Problems solved by technology

As far as the existing power batteries are concerned, due to defects in system design and differences in use conditions, the factors causing health changes are more complicated, the discreteness of batteries becomes stronger, and the inconsistency between batteries is large. Moreover, power batteries During secondary utilization, its working conditions are different from those of electric vehicles. Therefore, the screening and grouping method of power batteries in electric vehicles is not suitable for the screening and grouping method of secondary utilization.

Method used

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  • A method for recycling a power battery

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] Step 1: Test battery charge and discharge parameters.

[0032] When selecting electric vehicle power batteries, the main consideration is the capacity consistency between batteries, which includes the capacity of the constant current stage and the constant voltage stage. When power batteries are used for secondary use, the main application is in the field of energy storage. When the battery is used in energy storage conditions, there is usually no constant voltage charging of the battery, and the energy of the battery is measured instead of the capacity of the battery. The capacity of the battery is the integral of the current to time, and the energy is the product of the capacity of the battery and the voltage platform. Due to the poor consistency of the voltage platform of the battery, during the battery screen...

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Abstract

The invention relates to a method for recycling a power battery. The method comprises (1) a step of measuring parameters of battery charging and discharging, (2) a step of measuring battery self-discharge, (3) a step of measuring thermal effects, (4) a step of measuring the battery impedance, (5) a step of screening operating conditions, and (6) a step of distributing the operating conditions. According to the invention, by a new multi-parameter screening, consistency of the power battery in a secondary utilization process is improved, thus prolonging service lifetime of the power battery. Through a screening method based on the battery application operating conditions, residual performance of the power battery is made full use of and secondarily utilized. The battery self-discharge and the thermal effects are used as screening parameters, and security of the power battery in the secondary utilization process is fully considered.

Description

technical field [0001] The invention relates to a method for recycling electric energy, in particular to a method for recycling power batteries Background technique [0002] Electric vehicles have high requirements on the performance of power batteries, especially on capacity, in order to ensure the power performance, mileage and safety performance of electric vehicles during operation. When the capacity drops to a certain level, it must be replaced. Batteries retired from electric vehicles still have more than 70% of their remaining capacity. Lithium-ion power batteries are mainly used for electric vehicles. This battery has the advantages of high specific energy, good temperature characteristics, and long cycle life. After re-screening and matching, it can be used in relatively good working conditions and meet battery performance requirements. In relatively low occasions, the secondary utilization of the power battery is realized. The secondary utilization of the power b...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42G01R31/36
CPCY02E60/10
Inventor 刘道坦来小康郭剑波范茂松焦东升刘秀兰徐彬刘伟
Owner STATE GRID CORP OF CHINA
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