1. The internal switch element is used inside the lithium -ion battery. When the temperature of the battery rises, the resistance value rises, and the temperature stops discharge after the temperature is too high. 2. Set up a battery outlet in the structure. When the inner pressure of the battery rises to a certain extent, the pores are automatically opened to keep the internal pressure on the internal pressure imbalance of the alert and cause the battery to burst. 3. Optimize the electrolyte system. At prese