COOLING STRUCTURE OF SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide cooling structure of a secondary battery reducing the dispersion of temperatures in battery cells.

SOLUTION: The cooling structure of the secondary battery is equipped with a plurality of battery cells 33 stacked so that side surfaces 33a are faced in a adjoining position; and a spacer 21 arranged between the plurality of battery cells and forming a cooling air passage 26 through which cooling air flows along the side surfaces 33a. The spacer 21 has a plurality of ribs 22 and a plurality of bosses 23. The plurality of ribs 22 are arranged on the upstream side of cooling air flow in the cooling air passage 26. The plurality of bosses 23 are arranged in the downstream side of the cooling air flow in the cooling air passage 26. The spacer 21 forms the cooling air passage 26 between the plurality of ribs 22 and between the plurality of bosses 23. The area of the cooling air passage 26 formed on the side surface 33a per area is larger in the cooling air passage 26q formed between the plurality of bosses 23 than the cooling air passage 26p formed between the plurality of ribs 22.

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