Analyze the low temperature performance of several batteries

18650 low temperature battery performance comparison 18650 battery is currently the most popular size and specification battery in industrial applications. It is widely used in various fields. In the direction of application, high temperature and low temperature have great limitations on its development. What are their respective low-temperature characteristics? 18650 low-temperature batteries At present, the types of 18650 low-temperature batteries are mainly low-temperature 18650 lithium batteries, low-temperature 18650 nickel-hydrogen batteries and low-temperature 18650 lithium iron phosphate batteries, which are relatively easy to scale-up processing. The important analysis of the low temperature performance of these batteries is as follows. 1. The low-temperature performance of conventional nickel-hydrogen batteries in the low-temperature 18650 nickel-hydrogen battery market is poor. When the temperature is above -10°C and the effective capacity is less than 60%, the discharge performance decreases linearly. They can only be discharged at low currents. As a domestic battery brand manufacturer, the low-temperature Ni-MH battery developed by the company adopts a patented formula, which greatly improves the performance of the low-temperature Ni-MH battery. It can be charged at -20℃, discharged at 0.2℃ at -40℃, the discharge capacity is still greater than 75%, the measured cycle life is 700 times, and the DOD cycle life is 80%. Low-temperature nickel-metal hydride batteries have lower capacity and discharge rate than low-temperature lithium batteries on the voltage discharge platform, so low-temperature lithium batteries are more acceptable in the current market. 2. Low temperature 18650 lithium battery Low temperature lithium battery mainly includes low temperature lithium iron phosphate battery and low temperature terna-18650 lithium battery. (1) The low temperature performance of low temperature lithium iron phosphate battery 18650 low temperature lithium iron phosphate battery is better than low temperature nickel hydrogen battery, ordinary lithium iron phosphate battery can reach -20 ℃ can reach 0.2 ℃ charge and discharge, about 80% of the discharge capacity Because the processing capacity of the manufacturer is different, it will be different. At present, the low-temperature lithium iron phosphate battery of the gripp battery can achieve the following performance: the discharge curve of the low-temperature lithium iron phosphate battery processed by the gripp at different temperatures, the discharge temperature range is large, and it can be discharged at -40℃ to 55℃, and the discharge capacity quite. After 300 cycles, the capacity retention rate of the gripp low-temperature lithium iron phosphate battery discharged at 0.2c at -20°C is still greater than 93%. The flow rate at 0.2°C exceeds 85% of the initial flow rate at -20°C, more than 70% at -30°C, and more than 55% at -40°C. (2) Low-temperature 18650 lithium batteries At present, low-temperature lithium batteries are widely used in the low-temperature battery market. In terms of current technology, the low-temperature performance of low-temperature lithium batteries can achieve the following data: low-temperature discharge performance is the lowest, at -50 ℃ discharge 0.2 ℃, efficiency is more than 60%; at -40 ℃, discharge 0.2 ℃, discharge capacity can reach 80%; wide temperature range, -50C to 50C; excellent low-temperature cycle performance, 0.5c charge and discharge at -30℃, keep more than 85% capacity after 300 cycles; compared with conventional lithium polymer batteries, Break through the discharge temperature limit of -20℃~60℃. Large current can occur, and large capacity can be maintained at -50°C. Under the working environment of -50℃, it can still maintain excellent performance. Low temperature lithium battery charge and discharge performance curve: Low temperature lithium battery charge and discharge performance curve From the comparison of the above low temperature battery performance, low temperature lithium battery has the best performance. 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 article: How to weld 18650 battery?