How to design the internal structure of the lithium battery to be safe?

Mobile phones and notebooks use lithium batteries. Lithium batteries are devices that rely on the movement of lithium ions between the positive and negative electrodes to carry out chemical reactions to supply electricity for response release. It requires lithium ions to shuttle between the positive and negative electrodes without attaching Other influencing factors. Technically speaking, this design is completely achievable, but in practice, because lithium batteries are extremely active products, any abnormal situation may cause battery problems. All lithium battery explosions are caused by short circuits. The phenomena that cause short circuits include overcharge, overdischarge, overcurrent, and overheating. They are short-circuited through the internal structure of the lithium battery. The so-called internal cause determines the meaning of the external cause. The structure itself is a process manufacturing process, and the process manufacturing process is difficult to 100% guard against the existence of defects. The positive and negative electrodes where the lithium ions stay should be clean, and the electrolyte and diaphragm should be free of impurities during the shuttle. However, during the manufacturing process, the electrolyte and the diaphragm are difficult to completely guard against metal dust, copper foil or aluminum foil and other debris. When people use improperly (overcharge, overdischarge, overcurrent) or place the lithium battery in an extreme environment (excessive temperature), the lithium battery will overheat, and the quiet state of the fragments at room temperature will be broken, and it will be in a relatively high temperature. Thermal movement occurs in the hot electrolyte space. In the next step, if the fragments are close to the diaphragm, the hot fragments will affect the isolation purpose of the diaphragm and cause a short circuit. It can be seen that the short circuit is caused by two reasons: one is that there are impurities in the battery, and the other is that the impurities will move. The intermediate between the two is heat. Therefore, the short circuit must be accompanied by heat, and the heat is not necessarily a short circuit. In the third step, a short circuit will cause sparks, and the electrolyte is a flammable liquid. The sparks in a confined space will cause the battery to burn and explode. This is easy to understand. Therefore, there is currently a polymer lithium battery with a gel electrolyte instead of a liquid electrolyte, which can reduce the probability of short circuits. But it cannot be fully guarded. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the differences between lithium batteries and polymer lithium batteries