Battery pack and lower case

Abstract

Conventional battery packs had the problem of not being able to control the direction in which the thermal conductive agent flowed out. [Solution] One embodiment of the battery pack according to the present invention comprises a plurality of battery cells, a battery storage section for housing the plurality of battery cells, and a heat sink plate arranged on the outside of the battery storage section such that a heat dissipation surface is exposed. The battery storage section has a bottom surface in which the top surfaces of heat dissipation protrusions 21a and 21b formed on the back side of the heat dissipation surface are exposed, and a plurality of walls are formed to surround the area in which the top surfaces of the heat dissipation protrusions 21a and 21b are exposed. A pond structure is formed at a position corresponding to an electrode component attached to a battery cell, and a heat conductive agent is filled into the pond structure. A plurality of heat conductive agent filling sections are formed in the row direction in which the battery cells are stacked, and a passage 15a is formed to extend in the row direction in the area adjacent to the plurality of heat conductive agent filling sections. The plurality of heat conductive agent filling sections have the heat conductive agent amount control wall facing the passage 15a as the lowest of the plurality of walls.

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