| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack capable of securing a battery cooling performance, and restraining noises at the same time.SOLUTION: A battery pack 1 comprises plural battery cells 3 connected to each other in an energization manner, a pack case 2 housing the plural battery cells 3, a blower 4 for circulating air inside the pack case 2, and an air circulation passage 5 formed inside the pack case 2. The circulation passage 5 includes a top wall side passage 51 that is provided between a top wall 20 of the pack case 2 and the plural battery cells 3, and a collection passage 53 that is provided between a bottom wall 22 and the plural battery cells 3. The top wall side passage 51 and the collection passage 53 constitute a passage blocked inside the pack case 2, so that air emitted from the blower 4 is sucked by the blower 4 via the top wall side passage 51 and the collection passage 53. A vertical cross section area of a passage cross section parallel in an upward and downward direction of the top wall side passage 51 is set larger than that of the collection passage 53. |
