Overcharging safety characteristics of retired VRLA

doi:10.16265/j.cnki.issn1003-3033.2020.04.003

Abstract

Abstract: In order to solve problems of battery temperature rise, gas generation and failure caused by overcharged VRLA, an experiment was conducted on a module composed of 8 VRLA cells in parallel with rated parameter of each cell at 12 V/160 Ah, and it was overcharged at constant current of 0.17 C (27 A). The results show that H₂, SO₂, and CO are generated in sequence 169, 189, and 209 s after overcharge while hydrocarbon gas is generated at 33 minutes. 17.6 V is the maximum charging voltage for retired VRLA batteries, and once it is reached, internal electrolytic water as well as other reactions will be intensified. According to thermal simulation temperature curve, internal and external temperature difference of the module can be 40 ℃ while temperature difference of each cell can also be significant after overcharge for a long time with a maximum gap of 30 ℃ . In addition, retired VRLA does not cause obvious deformation and combustion after overcharging. But abnormal status of batteries, like overcharging, can be warned by monitoring concentration variation of H₂.

Key words: reutilization, valve-regulated lead acid battery (VRLA), battery module, overcharge, safety

CLC Number:

X946

WU Jingyun, SHI Cheng, GUO Pengyu, YAO Lijuan, SUN Yiting, JIN Yang. Overcharging safety characteristics of retired VRLA[J]. China Safety Science Journal, 2020, 30(4): 14-20.

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