The self ignition hazards of lithium-ion batteries are serious, and they are in the rapid development stage of new energy vehicles. Any battery self ignition accident may bring a company back to the pre liberation period overnight, causing harm to the lives of homeowners. Many times, it is inevitable that the battery will self ignite. If this issue is addressed, the development of new energy vehicles will be better.

　　It is reported that some companies claim to have achieved non spontaneous combustion of power lithium-ion batteries through passive defense technologies such as non self igniting electrolytes, high-temperature resistant barriers, and refrigeration thermal control fluids. In theory, all three technologies correspond to the treatment of battery self ignition process. And battery self ignition, first of all, the battery itself presents heat during operation. When the heat production and heat dissipation cannot be balanced, heat begins to accumulate inside the battery, causing the temperature to rise. When the internal temperature of the battery reaches 130 ℃, the ordinary barrier will melt and contract, and the positive and negative poles of the battery will experience a short circuit due to the lack of barrier blocking, resulting in a more violent electrochemical reaction - releasing more heat and presenting gas - the battery will spontaneously ignite and explode.

　　So let's talk about these three central technical directions next. The breakthrough of electrolyte technology is the reactive liquid electrolyte of batteries, called electrolyte. Electrolytes are used for charge conduction inside lithium-ion batteries, and batteries without electrolytes cannot be charged or discharged. At present, lithium-ion batteries are mostly composed of flammable and volatile non-aqueous solutions. This composition system has higher specific energy and voltage output compared to batteries composed of aqueous electrolyte, which meets the higher energy needs of users. Due to the flammable and volatile nature of non aqueous electrolyte, it infiltrates the interior of the battery and also constitutes the source of spontaneous combustion of the battery. The technological breakdown of electrolytes often leads to reactions in battery development.

　　In the history of zinc manganese battery development, there have been three reactions, with two reactions coming from technological breakthroughs in electrolytes, which have improved the discharge performance and specific energy of the battery. Currently, the safety of lithium-ion batteries is a problem, and there are several market technology directions for electrolytes to handle spontaneous combustion issues. The company's electrolyte still exists in the form of electrolyte, which must be non-aqueous solution electrolyte or room temperature ionic liquid. Although the detailed technology is unknown, gel and solid electrolyte will also be a safer direction in the future. The barrier is not a process of self ignition in batteries with high technological content. The internal short circuit caused by high-temperature ablation and contraction is an important reason for the barrier. Improving the heat resistance temperature of the barrier is the technical direction for manufacturing safer batteries.

　　The barrier is not as simple as a layer of paper. In addition to temperature, the infiltration ability, porosity, mechanical strength, internal resistance, electrochemical stability, and other factors of the barrier are also considered in practical consumption. So barriers are not as simple as a layer of paper. From the perspective of temperature resistance, safety, and liquid absorption rate, taking these factors into account, the technical direction of barriers is as follows. The company's barrier uses the aramid barrier consumed by electrospinning technology, which has excellent comprehensive performance, with a small amount of consumption by Emperor and Jiangsu Shengou aramid. Compared to ordinary barriers, Weihong's PMIA barrier has a simpler consumption process, but the current price is relatively high. In the future, there will be enough space to support the frequent iteration of new technologies, bringing safer products to the new energy industry.

　　A battery with sufficient heat dissipation is a safe battery. As mentioned above, electrolyte is used to isolate the source of spontaneous combustion, and barrier is used to improve the heat resistance temperature. Therefore, sufficient heat dissipation is used to reduce the battery temperature and avoid excessive heat accumulation causing the battery to lose control of heat. Assuming that the temperature of the battery rises sharply to 300 ℃, even if the barrier does not melt and contract, the electrolyte itself, electrolyte, and positive and negative electrodes will undergo intense chemical reactions, releasing gas, forming internal high pressure and explosion. Therefore, adopting appropriate heat dissipation methods is the closed-loop of the battery's non spontaneous combustion treatment method. The passive defense of the company's refrigeration and thermal control fluid is still important for battery heat dissipation. Isolation of air is an additional function. Assuming that air cannot be isolated, the cooling circulating fluid is prone to leakage during driving, climbing, and vibration, reducing the heat dissipation function, which is unacceptable for battery safety. Micro macro belongs to liquid cooling technology, which includes three active cooling methods for batteries: air cooling and phase change data cooling.

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