18650 low temperature battery performance comparison

by:CTECHi     2021-09-18
As the most popular and universal size battery for industrial applications, the 18650 battery has a wide range of applications. The two directions of high temperature and low temperature greatly limit its development in the application direction. What are the current domestic low-temperature 18650 batteries? How about their respective low temperature performance? 1. The low-temperature performance of conventional nickel-hydrogen batteries in the low-temperature 18650 nickel-hydrogen battery market is relatively poor. Above -10°C, the discharge performance decreases linearly below zero. The effective capacity is less than 60% and can only be discharged at low current. As a domestic battery brand manufacturer, Greepu's low-temperature nickel-metal hydride battery developed by the company adopts a proprietary formula, which greatly improves the performance of low-temperature nickel-metal hydride batteries. It can be charged at -20°C and discharged at 0.2C at -40°C. It can still discharge more than 75% capacity, 700 times measured cycle life, and cycle life 80% DOD. Low-temperature nickel-metal hydride batteries are inferior to low-temperature lithium batteries in terms of voltage discharge platform, capacity and discharge rate. Therefore, low-temperature lithium batteries are relatively easy to accept in the market. 2. Low-temperature 18650 lithium battery Low-temperature 18650 lithium battery mainly includes low-temperature 18650 lithium iron phosphate battery and low-temperature ternary 18650 lithium-ion battery, each of which has different low-temperature performance. (1) Low temperature 18650 lithium iron phosphate battery Low temperature lithium iron phosphate battery has better low temperature performance than low temperature Ni-MH battery, ordinary lithium iron phosphate battery can achieve 0.2C charge and discharge at -20℃, discharge capacity About 80%, it will be different because of different manufacturers' production strengths. At present, the low-temperature lithium iron phosphate battery of Gripp battery can achieve the following performance: the discharge curve of the low-temperature lithium iron phosphate battery produced by Gripp at different temperatures, the discharge temperature range is wide, and it can discharge at -40℃ to 55℃ , Discharge capacity is considerable. After 300 cycles of the cycle test of Gripp low-temperature lithium iron phosphate battery with 0.2c discharge at -20°C, the capacity retention rate is still more than 93%. The discharge capacity at 0.2C at -20℃ exceeds 85% of the initial capacity, 70% at -30℃, and the discharge capacity at -40℃ is about 55% of the initial capacity. (2) Low temperature 18650 lithium ion battery is currently low Low-temperature lithium battery batteries are more widely used in the battery market. As far as current technology is concerned, the low-temperature performance of low-temperature lithium batteries can achieve the following data: high low-temperature discharge performance, minimum discharge at -50℃ at 0.2C, efficiency 60 % Above; under -40℃, discharge at 0.2C, discharge capacity reaches 80%; wide operating temperature range, -50°C to 50°C; excellent low temperature cycle performance, charge at 0.5C at -30℃ After 300 cycles of discharge, the capacity remains above 85%; compared with traditional lithium polymer batteries, it breaks through the discharge temperature limit of -20℃~60℃. It can generate large current at -50℃ and maintain large capacity; under -50℃ working environment, it can still maintain its excellent performance
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