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Solar Power Battery Li Ion Battery Safety Analysis

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Oct 15, 2018

Since the first half of this year, battery accidents have occurred frequently, there is talk that should use lithium iron phosphate batteries instead of ternary lithium ion batteries. Familiar with the thermal runaway process of lithium batteries should understand that the safety of lithium iron phosphate batteries is only relatively speaking, do not do the overall safety of the protection and design, a variety of batteries are facing danger.


The thermal runaway process of the battery is as follows: when the temperature of the battery rises to a certain degree (about 130 C), the SEI film on the anode surface will begin to decompose, resulting in the intense redox reaction of the high active lithium carbon anode exposed to the electrolyte, and the heat generated will make the battery into a high-risk state. When the local temperature of the battery rises above 200 C, the passive film on the cathode surface decomposes into oxygen evolution, and continues to react violently with the electrolyte to produce a large amount of heat and form a high internal pressure. When the temperature of the battery reaches above 240 C, the exothermic reaction between the lithium carbon anode and the binder is also accompanied.


Thus, the direct cause of thermal runaway in lithium batteries is the breakage of SEI film on the anode surface, which leads to the intense exothermic reaction between the highly active lithium-intercalated anode and the electrolyte. The decomposition and exothermic reaction of the cathode material is only one of the links of the thermal runaway reaction, or even not the main factor.


Therefore, the so-called lithium iron phosphate (LFP) because of thermal stability and safety is actually one-sided, the safety of lithium iron phosphate is only relatively speaking, so the battery safety as an argument to judge lithium iron phosphate and ternary technology is biased approach.


solar power battery is kind of li ion batteries, battery is a storage system, generally use 18650 batteries, battery safety is directly related to live safety.

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