On July 15, 2021, the IEC website announced the upgraded version of the IEC62133-2:2017 standard, the 2021 version.

Compared with the 2017 version of the standard, the new version has been upgraded and changed as follows:

1. The updated standard revised the shelf time of cell constant temperature charging in section 7.1.2, and revised the shelf time from 1h and 4h to 1h to 4h, and the charging method was revised from constant voltage to first constant current charging and then constant voltage charging.

2. In section 7.3.5, the squeeze test, the updated standard deletes the description of the upper limit of the charging temperature in the original standard.

3. Section 7.3.6 Overcharge test adds a description of the test requirements. If the battery has a charging protection circuit, it should be able to protect the battery core from fire or explosion.

4. Chapter 7.3.9 Mandatory internal short circuit test, revised the description of the test temperature, from the original 10°C/45°C to the lower/ upper charging temperature limit declared by the manufacturer.

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