The electric car battery is disconnected. The reason for the break: the battery has a certain stability, that is, the lead acid reaction at a certain speed to supply energy, when the energy is put too fast (or not) will produce a break, for example, the electric vehicle without electricity overdischarge, high-power car high-power work, electric vehicle water (in fact, short circuit), direct short circuit, electric vehicle for a long time do not ride, etc., many reasons, Breakage is physical damage, that is, the battery is broken (chemical is that the battery still works, but for a short period of time).