Battery pole piece breakage detection method and system

Abstract

The invention provides a battery pole piece fracture detection method and system. The battery pole piece fracture detection method comprises the following steps: carrying out high-temperature aging treatment on a plurality of batteries; placing the battery in a test device, connecting positive and negative pole pieces of batteries with a preset current, and obtaining test parameters of each battery; obtaining a corresponding test value according to each test parameter; detecting whether a difference value between the test parameter and the test value is matched with a preset difference value or not; and when the difference value between the test parameter and the test value is not matched with the preset difference value, taking out the battery corresponding to the test parameter. When a battery pole piece is broken, the test parameter is changed, wherein the difference between the test parameter and the test value reflects the change amplitude of the test parameter; and the unqualified battery is accurately screened out according to the comparison result between the difference value and the preset difference value, and thus the battery detection qualification rate is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and system for detecting fracture of battery pole pieces. Background technique [0002] With the rapid development of the country's new energy vehicle industry, nickel-cobalt lithium manganese oxide batteries are improving the cruising range of new energy vehicles due to their high voltage platform, high energy density, high tap density, electrochemical stability, and good cycle performance. It has obvious advantages in alleviating users' worries about cruising range, and also has the advantages of high discharge voltage, relatively large output power, good low-temperature performance, and adaptability to all-weather temperatures, so it is gradually being favored by automobile manufacturers and users. [0003] As the energy density of the battery is getting higher and higher, the bonding force between the single crystal particles forming the secondary ball of the terna...

AI Technical Summary

Problems solved by technology

Using a battery voltage internal resistance tester to test can only obtain the internal resistance of the battery, but cannot effectively identify the problematic battery cells, that is, to accurately screen out unqualified batteries, that is, to screen out unqualified batteries. The accuracy rate is not high, so that the detection pass rate of the produced battery is low

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