China Classification Society’s “Guidelines for the Inspection of Pure Battery-powered Ships” 2019, Chapter Two, Section 2, Safety Classification, divides battery safety into two levels:
| Security Level | Thermal runaway test | Risk of combustion (explosion) | |
| Release oxygen | Release of toxic combustible gas | ||
| 1 | √ | √ | Higher |
| 2 | √ | Lower | |
Safety classification list
Note:
(1) In the case of thermal runaway, it releases oxygen and toxic combustible gas, and the battery with a higher risk of combustion (explosion) has a safety level of 1.
(2) In the case of thermal runaway, only toxic combustible gases are released, and the battery with a lower risk of combustion (explosion) has a safety level of 2.
From the classification list, we can know that the main difference of the classification is whether oxygen is released under thermal runaway conditions, whether the combustion (explosion risk) is high, the current manufacturers of lithium batteries are basically capable of conducting thermal runaway tests, and they can provide countries Mandatory test report, but through the judgment conditions of thermal runaway (under thermal runaway, the battery should not catch fire or explode), it can be found that the thermal runaway test does not require the release of oxygen and toxic combustible gas, and the concentration of the release. The risk of combustion and explosion is judged. If you want to analyze the gas released by thermal runaway, you must collect the released gas and use relevant gas detectors to detect and analyze the released smoke. At present, there are few organizations that can meet the test conditions and obtain CCS approval. Therefore, it is particularly important to establish the corresponding test capabilities as soon as possible.
