How to deal with the heat dissipation problem of the ternary power lithium ion battery pack?

The power ternary lithium-ion battery pack is the heart of electric vehicles. It must be able to withstand high temperatures, water, and freeze. The power lithium battery has a large working current and large heat generation, and at the same time the battery pack is in a relatively closed situation, which will cause the temperature of the battery to rise. In such high temperature weather, can the power lithium battery calm down? One is the ternary lithium-ion battery pack represented by Tesla. It has higher energy density, small size and light weight, but because heat dissipation is a big problem, it needs to install a water-cooled heat dissipation system with special space and quality, and The safety is not as good as iron batteries. In addition, its battery decays faster, perhaps 800-1200 full charge cycles, it decays by 20%. Full charge means that only 0-100% charge is counted once. If the power is from 50%-100%, it counts as half charge. It is calculated based on the mileage of 300 kilometers, and the scale of reaching the change is between 240,000 and 360,000 kilometers. According to the mileage of a family car, it will take more than ten years to say. How to deal with the heat dissipation problem of the ternary power lithium ion battery pack? Because the non-aqueous electrolyte itself is flammable and volatile, it infiltrates the inside of the battery and also forms a source of combustion for the battery. Therefore, the working temperature of the above two battery materials should not be higher than 60℃, but the outdoor temperature is close to 40℃ at the moment, and the battery itself produces a large amount of heat, which will cause the working temperature of the battery to rise, and if there is thermal runaway, the environment will be very serious. It's dangerous. In order to prevent it from turning into a barbecue, it is particularly important to dissipate heat from the power lithium-ion battery pack. Lithium-ion battery packs have two types of heat dissipation: active and passive. There is a big difference in efficiency between the two. The cost required by the passive system is relatively low, and the method adopted is relatively simple. The active system layout is relatively large and requires more additional power, but its thermal management is more effective. The electrolyte is to keep away from the burning origin, the barrier is to increase the heat-resistant temperature, and the heat dissipation is to lower the battery temperature to prevent excessive heat buildup from triggering the battery's thermal runaway. If the battery temperature rises sharply to 300°C, even if the barrier does not melt and shrink, the electrolyte itself, the electrolyte and the positive and negative electrodes will also produce a strong chemical reverberation, release gas, form an internal high pressure and explode, so recover a suitable heat dissipation method to Important. The reason for the overheating of the power lithium-ion battery pack comes from the unfair selection of the battery and the injustice of the thermal design. The temperature of the battery may rise due to an external short circuit, and the discussion of the cable may become loose. It should be handled from two aspects: battery design and battery management. . From the perspective of battery material design, we can develop materials to prevent thermal runaway and block the reverberation of thermal runaway; from the perspective of battery management, we can predict the temperature range of the difference to convey the security level of the difference, so as to hold a graded alarm. Air-cooled layout of power lithium-ion battery pack heat dissipation method 1. Install a heat dissipation fan at one end of the power lithium-ion battery pack, and leave vents at the other end to make the atmosphere move faster between the deviations of the battery cell and take away the current appearance of the battery cell. High heat; 2. Add thermally conductive silicone gaskets to the top and bottom of the electrode to allow the heat that is not easy to be released from the top and bottom to be transferred to the metal shell through the TIF thermally conductive silicone sheet for heat dissipation. At the same time, the silicone sheet’s high-electricity cut-off edge and protection The piercing function is very useful for protecting lithium-ion battery packs. 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 post: What are the fundamental characteristics of the negative electrode material of the lithium ion battery?