The safety valve is an important component to ensure the safe operation of lithium-ion batteries (LIBs). However, the effect of safety valve type on the thermal runaway (TR) and gas venting behavior of LIBs, as well as the TR hazard severity of LIBs, are not known.
One is the design of the battery body. During the charging and discharging process of the lithium iron phosphate battery, it is inevitable that a certain amount of heat will be generated. For this reason, the thermal stability of the electrode and electrolyte materials is the primary consideration.
According to the manufacturer, the safety venting pressure of all three batteries was 1.2 MPa. The maximum expansion force of the three batteries was 9.63 ± 1.15, 8.53 ± 0.28 and 7.95 ± 0.45 kN, respectively, which revealed that the expansion behaviors of three batteries were severe before the safety venting.
The cavity safety valve of Sample battery 3 # has a top cap, which impedes the instantaneous venting behavior and leads to a higher maximum expansion force during TR. Fig. 5. The expansion force and gas pressure variations of the LFP batteries with three types of safety valves.
During the discharge process, the output voltage of the lithium iron phosphate battery is relatively stable, and it can achieve high rate discharge . According to relevant data, the service life of lithium iron phosphate batteries has obvious advantages compared with traditional lead-acid batteries.
(a) The battery with oval safety valve; (b) the battery with round safety valve; (c) the battery with cavity safety valve; (d) error analysis of the expansion force. Similarly, the safety valve type had a large influence on the gas venting behavior of the batteries.
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：（）,3320 Pa,。 ； (II)TR,TR …
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：（）,3320 Pa,。 ； (II)TR,TR。 TR, …
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In this paper, three 100 Ah commercial lithium iron phosphate (LFP) batteries with oval, round and cavity safety valves are studied on the TR and gas venting behavior under overheating. The gas venting of LFP batteries is first reported as a smoky tornado, and the …
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