The influence of temperature on the lithium battery

"Why does lithium-ion battery last less in winter than they do in summer?" someone asked online. The following is the answer of lithium battery practitioners.

For lithium battery, at present there is no clear theoretical support for the internal resistance, discharge platform, life, capacity and other inevitable relations under various temperature performance in the industry, and the relevant calculation formulas and mathematical models are still in the exploratory stage. Generally, lithium batteries is not sensitive to the range 0 to 40 ℃ temperature , once out of this range, its life and capacity will be discounted.

The specific quantitative method is still not available, because lithium battery activity is too high, consistency is also the biggest problem, even if the same batch, the same material, the same process of the product, the performance will be very different.

Many experiments have shown that the low-temperature performance of lithium batteries with different materials also varies. Lithium iron phosphate, now the most popular material, has the lowest low-temperature performance. When our products - 10 ℃ release capacity of 89% of the maximum capacity which is relatively high. At 55 ℃its release capacity can reach 95%, relatively low attenuation or less. This is the product sent for inspect, the quality is much higher than that of normal products in the assembly line.

Relatively speaking, lithium, cobalt acid lithium manganese acid and low temperature properties of ternary products are better, but what sacrifice is high temperature performance. The lithium iron phosphate sought after in the industry now has high safety performance and good high temperature performance. In fact, the battery activity is not as high as the above three, which is relatively safe. The overall performance is not as good as manganese lithium or ternary.

Therefore, lithium battery life in winter is bound to be shorter than in summer.

By the way, it's best not to charge lithium batteries in winter. As a result of low temperature, lithium ion nested on the negative pole will produce ion crystal, directly piercing the diaphragm, generally resulting in micro-short circuit affects the life and performance. Therefore, some reflect that lithium batteries could not be charged in winter. Part of the battery management system was due to the protection of the product, and some of them could not be charged due to quality problems. The same is said to have happened with ATL (national champion, just got apple's share) products.

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