Compared with lithium battery, nickel metal hydride battery is superior in safety, mainly because the specific heat capacity and energy density of nickel metal hydride battery are relatively low, and the melting point is as high as 400 ℃. In case of collision, extrusion, puncture, short circuit, etc., the battery temperature will not rise sharply, causing spontaneous combustion.

　　Moreover, after years of technological development, NiMH batteries are now very mature, and higher quality stability is also conducive to improving battery safety. It is worth noting that Toyota has sold more than 20 million dual engine models equipped with NiMH batteries so far, but it has never been exposed that there has been a case of spontaneous combustion.

　　In contrast, lithium batteries have strong lithium ion activity and high energy density. At the same time, the raw materials of some types of lithium batteries are combustible. Once the battery short circuit temperature rises due to various factors, the internal electrolyte will undergo violent chemical reactions, which may lead to spontaneous combustion of the battery. In recent years, it is not uncommon for new energy vehicles equipped with lithium batteries to have spontaneous combustion.

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