| CPC H01M 50/367 (2021.01) [H01M 10/0525 (2013.01); H01M 50/213 (2021.01); H01M 50/24 (2021.01); H01M 50/247 (2021.01)] | 14 Claims |
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1. A battery pack comprising:
a battery cell including an exhaust valve that opens when an internal pressure of the battery cell exceeds a set pressure; and
a case that houses the battery cell, wherein
the case includes
an inner case that houses the battery cell and
an outer case that incorporates the inner case,
the inner case includes a plurality of inner smoke vent holes through which exhaust gas ejected from the exhaust valve passes,
the outer case includes a plurality of outer smoke vent holes through which the exhaust gas having passed through the plurality of inner smoke vent holes passes,
the case includes the inner case disposed in the outer case,
an expansion gap of the exhaust gas is provided between the inner case and the outer case,
the plurality of inner smoke vent holes and the plurality of outer smoke vent holes are connected via the expansion gap,
the exhaust gas having passed through the plurality of inner smoke vent holes is guided to the plurality of outer smoke vent holes through the expansion gap,
the plurality of outer smoke vent holes guides the exhaust gas in a direction different from a direction in which the plurality of inner smoke vent holes guides the exhaust gas, and
the plurality of inner smoke vent holes and the plurality of outer smoke vent holes include an inner diameter of 0.5 mm or more and 3 mm or less.
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