Battery self-discharge test method

Abstract

The invention discloses a battery self-discharge test method. The method comprises the following steps: determining a pressure drop reference of a to-be-tested batch battery, and selecting whether toset an identification code after partial volume ageing according to different selections of the batteries; entering an identification code and performing first open-circuit voltage testing on the battery and recording the same; laying aside the battery after the first open-circuit voltage testing under a constant temperature environment at the preset laying aside days; identifying the battery laying aside according to the identification code, and performing the second open-circuit voltage testing on the battery, and recording; computing the difference of twice voltage values of the battery under the same identification code, and comparing the difference with the pressure drop standard value, regarding that the battery is qualified if the difference is less than the pressure drop standard value, and regarding that the battery is unqualified if the difference is greater than the pressure drop standard value, wherein the pressure drop standard value is equal to the pressure drop referencevalue* laying days. The screening precision of the battery self-discharge unqualified product is improved.

Description

technical field [0001] The invention relates to the technical field of battery / battery pack detection, in particular to a battery self-discharge test method. Background technique [0002] At present, the terminal users of batteries often encounter battery voltage between 3.80V ~ 3.90V after storage or battery pack storage for 2 to 3 months, and when they are re-used, some batteries are found to be dead or low voltage, and these phenomena occur. The reasons generally fall into the following categories: [0003] Poor battery causes excessive self-discharge (such as a micro-short circuit inside the battery); [0004] The self-discharge of the protection board used by the battery pack is too large; [0005] Poor manufacturing of the battery pack results in a short circuit; [0006] The self-consumption current is too large due to the failure of the customer machine; [0007] The above four categories of phenomena will cause the battery to self-discharge too quickly. [0008...

AI Technical Summary

Problems solved by technology

However, this method is only a rough screening of the self-discharge of the battery, and those defective products with particularly large self-discharge are picked out, but there is no way to pick out those batteries with a slightly smaller self-discharge but still belong to unqualified products.

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