COOLING STRUCTURE FOR BATTERY PACK

To improve the air blow circulation efficiency inside a sealed battery pack, and thereby, to simplify the structure and provide uniform temperature distribution and a cooling effect.SOLUTION: In a battery pack 1, a swollen part 12 is formed above a rear part in a vehicle length direction FR of a battery case (upper and lower cases 10 and 20). On an upper surface 11 extending forward in the vehicle length direction from the rear part, a ridge part 13 protruded upward and extending in the vehicle length direction is formed. An airflow passage Fa1 communicated with the inside of the swollen part is formed between an inner surface of the ridge part 13 and an upper surface of battery modules 31 and 32. In the swollen part, a blower fan 5 arranged above in a vehicle height direction H for the battery modules is provided, and blow ducts 41 and 42 for sending air sent out from the blower fan while pressurizing the air into air outlets 427 and 428 located at an intermediate part in the vehicle length direction and the vehicle width direction in the plurality of battery modules are provided. The air Fa, Fb sent out from the air outlets circulates in the swollen part through a gap between the plurality of battery modules and through the airflow passages Fa1 and Fb1.SELECTED DRAWING: Figure 4 【課題】密閉型バッテリパック内部の送風循環効率を改善し、構造の簡素化と温度分布の均一化及び冷却効果を提供する。【解決手段】バッテリパック１において、バッテリケース（アッパー、ロアケース１０、２０）の車長方向ＦＲの後部上方に膨出部１２が形成され、後部より車長方向前方に延びる上面１１には、上方に突出し車長方向に延びる畝部１３が形成され、その内面とバッテリモジュール３１、３２上面との間に膨出部内に連通する空気流路Ｆａ１が形成され、膨出部の内部には、バッテリモジュールに対して車高方向Ｈ上方に配置された送風ファン５を備え、送風ファンから送出される空気を複数のバッテリモジュールの車長方向及び車幅方向の中間に位置した吹出口４２７、４２８に圧送するための送風ダクト４１、４２を備える。吹出口から送出された空気Ｆａ、Ｆｂは、複数のバッテリモジュールの間隙及び空気流路Ｆａ１、Ｆｂ１を通って、膨出部内に循環する。【選択図】図４