Battery self-discharge screening method

Abstract

The invention provides a battery self-discharge screening method, which is used for screening a plurality of batteries, and comprises the following steps: controlling the charge states of the plurality of batteries to be 0-8%; the multiple batteries are screened for the first time, whether the batteries are bad or not is judged by measuring and calculating whether the value of K of the batteries is discrete or not in the first screening, and the value of K is the ratio of the voltage difference of the batteries in the interval time to the interval time; and keeping the charge states of the plurality of batteries to continuously store the plurality of batteries, then carrying out secondary screening on the batteries, and judging whether the batteries are bad or not by measuring and calculating whether the voltage reduction difference values of the batteries are within a rated range or not. According to the battery self-discharge screening method, the screening process is rapid, accurate, simple, practical, low-carbon and environment-friendly, and the battery self-discharge screening method can be matched with logistics storage and is suitable for wide-range application.

Description

Technical field [0001] The application relates to the field of new energy and environmental protection, in particular to a battery self-discharge screening method. technical background [0002] At present, Ferrous lithium phosphate-graphite battery is developing rapidly as a power battery, and as a long-cycle battery, Ferrous lithium phosphate-graphite battery has been fully developed in the field of energy storage. Especially at present, the power energy storage technology is affected by policy and industry development, and lithium iron phosphate battery has a broad development prospect. [0003] As a battery for electric energy storage, the energy storage system usually takes containers as a unit, and each container contains thousands of batteries. In order to ensure the long-term stability of the battery pack in the container, the performance of these thousands of batteries should be kept as consistent as possible. Especially the self-discharge performance. When the difference...

AI Technical Summary

Problems solved by technology

In the prior art, the general screening method in the industry is to measure the battery at room temperature or high temperature after the battery capacity is calibrated. This method has a long period of standing and screening, and may cause irreversible damage to the battery capacity. loss, and further, the detection process of this method is cumbersome, and it is often necessary to charge and discharge the battery repeatedly, consuming too much energy

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