Self-discharge detection method after electric charging and battery detection device

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a self-discharge detection method after electric charging and a battery detection device. The self-discharge detection method after electric charging includes the following steps of S1, conducting capacity partition for the first time on batteries in an electric charging state, and obtaining the battery capacity C after calculation; S2, after the batteries are placed still for a certain time T1, testing open-circuit voltage OCV1 of the batteries, testing open-circuit voltage OCV2 of the batteries after thebatteries are placed still again for a certain time T2, and obtaining a self-discharge rate K of the batteries, wherein K is equal to a result obtained by dividing OCV1 minus OCV2 by T2 and then subtracting 12 h from the quotient above; S3, according to the value of K, classifying the batteries into a level A, a level B, a level C and a level D, wherein unqualified batteries at the level D are putinto a warehouse, batteries at the level B and level C are subjected to capacity partition for the second time, batteries the charging capacity of which is lower than a first preset value of the total capacity are placed for a certain time T3, batteries the charging capacity of which is higher than the first preset valve are placed for a certain time T4 and then subjected to capacity partition for the third time, and unqualified products are put into the warehouse. The method and device are used for solving the technical problems that battery testing time is too long in the prior art, batteryconsumption is large and the process is complicated.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a self-discharge detection method after charging and a battery detection device. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, the new secondary non-pollution energy has gradually attracted the attention of governments, research institutions and enterprises all over the world. The application of non-polluting renewable energy such as solar energy and wind energy has gradually become one of the energy focuses, and electric vehicles have been vigorously promoted by governments around the world to alleviate the pressure of energy and environmental pollution. [0003] The detection of lithium-ion battery self-discharge has always been a difficult point, because almost no equipment can accurately detect the energy of the battery under static conditions. Since the battery voltage and its own energy are not linearly ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-discharge detection method after charging, so as to alleviate the technical problems in the prior art that the battery test time is too long, the battery loss of the opponent is large, and the process is cumbersome.

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