A kind of ternary lithium battery safety classification method

Abstract

The invention discloses a safe capacity dividing method for a ternary lithium ion battery, which includes the following steps: 1. After the battery is formed and aged, the battery is placed on a capacity dividing cabinet to test the initial voltage V1 of the capacity dividing, and the capacity dividing is carried out when certain conditions are met, otherwise the capacity dividing The device protects the battery and stops dividing capacity. ②Charging process: stand for 2-10min, charge the battery with constant current to 4.1V under the specified current, stand for 2-10min, monitor the voltage V2 after standing, and divide the capacity if certain conditions are met, otherwise the capacity dividing device will protect the battery and stop Divide the capacity and charge it to 4.2v with constant current and constant voltage at the specified current. ③Let it stand for 2‑10min, and discharge the specified current to 3.0V. Repeat steps ②③ once to end the volume division. Using this method can effectively improve the safety problems in the capacity distribution process of lithium battery production lines without affecting the subsequent battery screening, and at the same time ensure that more accurate battery capacity data can be provided for subsequent battery grade screening.

Description

technical field [0001] The invention belongs to the technical production field of lithium ion batteries, and in particular relates to a method for safely distributing capacity of a ternary lithium battery. Background technique [0002] In the production process of lithium batteries, the main purposes of the step of capacity classification are as follows: ① Determine the battery capacity to provide a basis for later battery level screening; ② Determine the voltage of the shipped battery to facilitate the self-discharge screening of the battery. During the capacity separation process, the battery voltage is required to be charged to 4.2v, and the battery with defects such as potential short circuit may cause the battery to catch fire and explode when the battery is charged to a high voltage state, which will cause the surrounding batteries and capacity separation cabinet equipment to catch fire, resulting in security incident. On the other hand, during the formation process, ...

AI Technical Summary

Problems solved by technology

During the capacity separation process, the battery voltage is required to be charged to 4.2v, and the battery with defects such as potential short circuit may cause the battery to catch fire and explode when the battery is charged to a high voltage state, which will cause the surrounding batteries and capacity separation cabinet equipment to catch fire, resulting in security incident

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