Cascade utilization screening method of waste power batteries

Abstract

The invention discloses a cascade utilization screening method of waste power batteries. The method comprises the following steps of: (1) charging a waste power battery pack, so that the state of charge (SOC) of the waste power battery pack is 15 to 80 percent; (2) detecting the open-circuit voltage and internal resistance of each single battery; (3) connecting the single waste power batteries in parallel until the open-circuit voltages of the single waste power batteries are basically the same, comparing the open-circuit voltages of the connected batteries with the open-circuit voltage of each single battery which is not connected in parallel, recording a voltage fluctuation situation, putting the waste single batteries and standard single batteries at the temperature of 30 to 55 DEG C for 3 to 7 days or at room temperature for 10 to 30 days, and detecting the open-circuit voltages and the internal resistance of the waste single batteries and the standard single batteries; and (4) comparing the single waste power batteries in terms of appearance, open-circuit voltage, internal resistance, voltage fluctuation and health, classifying the single waste power batteries, and matching battery packs in the same class with an energy storage power grid. The method is simple, the utilization rate of power batteries is improved, the usage cost of energy storage batteries is reduced, and the large-scale screening, classification and cascade utilization of waste power batteries can be realized.

Description

[0001] technical field [0002] The invention relates to a screening method for cascade utilization of waste power batteries, which belongs to the technical field of battery technology and energy storage. Background technique [0003] Cascading utilization refers to the continuous use process of a used product that has reached the original design life, and then restores all or part of its functions through other methods, and this process belongs to the method of basically the same level or downgraded application. [0004] From the perspective of global economic development trends, urbanization, safety, energy and environmental protection policies have become important development directions, which affect the development of the automobile industry. In order to cope with the energy crisis and slow down global warming, many countries have begun to attach Develop a low-carbon economy. Because electric vehicles are driven by electricity, they can reduce carbon dioxide emissio...

AI Technical Summary

Problems solved by technology

However, usually when screening batteries, a special capacity detection cabinet for lithium-ion batteries is used to charge and discharge the batteries, and comprehensively examine the voltage, internal resistance, capacity, voltage drop and other factors of each battery. The equipment price is high and the maintenance cost is high. Screening The steps are cumbersome and the labor cost is high

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