| 摘要 |
A large-sized power supply device including: a plurality of lithium ion secondary batteries including sealed battery cases and safety valves, the sealed battery cases containing a positive electrode, a negative electrode, a porous heat-resistant layer placed between the positive and negative electrodes, and a non-aqueous electrolyte, and the safety valves being provided on the sealed battery cases and operating at a predetermined pressure; and a battery container in which the plurality of lithium ion secondary batteries are housed. The power supply device is improved in safety, generates substantially no gas and, therefore, does not require any special exhaust hose for discharging gas. Thus, a large-sized power supply device having a markedly high volume efficiency can be provided.
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