Only Japan uses lithium batteries on military submarines, the only one in the world, there is no semicolon! The best country to make lithium batteries in China, which does not accept refutation. Chinese conventional submarines are still using traditional lead-acid batteries! why? Because the safety of lithium batteries is extremely poor when encountering failure reactions: internal short circuit, high temperature, over (voltage) voltage. These three factors cause the temperature to reach a certain level, triggering an internal chemical reaction, generating heat and gas, and causing fire and explosion. Of course, the lithium batteries on Japanese submarines are not traditional ternary lithium batteries, but lithium iron phosphate batteries with higher safety! This lithium battery will not produce an open flame under thermal runaway, but it will produce high temperatures and smoke of 200 to 400 degrees! Moreover, the traditional ternary lithium battery will have a thermal runaway effect at 200 degrees, while the lithium iron phosphate battery will run out of control at 500 degrees! Lithium iron phosphate battery is lower in cost than a ternary lithium battery, but it has disadvantages such as low energy density and serious low-temperature recession! However, military equipment has to experience harsh use environments and violent external shocks, so the most important thing for military equipment is stability! And the use of lithium batteries with unstable chemical states in submarines can only be done by countries like Japan! If Japan has developed a safer lithium battery, it is understandable. With Japan's existing lithium battery technology, it is a very risky behavior!
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