COOLING STRUCTURE FOR BATTERY PACK

To improve the air blow circulation efficiency inside a sealed battery pack, and thereby, to simplify the structure ad achieve uniform distribution of temperature inside the battery pack and a desired cooling effect.SOLUTION: At a rear part of an upper surface (11) of a battery case in a vehicle length direction, a swollen part (12) swelling upward via an inclined surface (122) extending in a vehicle width direction is formed. The interior of the battery case is partitioned from a battery module side with a support plate (17), except for a peripheral part. A blow duct (4) that sends air sent out from a blower fan (5) arranged on the support plate while pressurizing the air into air outlets (427 and 428) located at an intermediate part of the battery module, includes upstream parts (421 and 422) branching at a front part of the blow duct (4) and extending toward both sides. Each upstream part has an inclined front surface (421a and 422a) extending in the vehicle width direction at a rear part of the inclined surface of the swollen part while being adjacent to and separated from the inclined plane. An airflow passage (420) is formed between the inclined front surface and the inclined surface. The air (Fb2) sent out from the air outlets circulates in the swollen part through the airflow passage.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することにより構造の簡素化とバッテリパック内部の温度分布の均一化および所期の冷却効果を達成する。【解決手段】バッテリケースの上面（１１）の車長方向の後部に、車幅方向に延びる傾斜面（１２２）を介して上方に膨出した膨出部（１２）が形成され、その内部は、支持プレート（１７）により周辺部を除きバッテリモジュール側と区画され、支持プレート上に配置された送風ファン（５）から送出される空気を、バッテリモジュールの中間に位置した吹出口（４２７，４２８）に圧送する送風ダクト（４）は、その前方で分岐して両側に延びる上流部（４２１，４２２）を含み、上流部は、膨出部の傾斜面の後方に隣接かつ離間して車幅方向に延びる傾斜前面（４２１ａ，４２２ａ）を有し、該傾斜前面と前記傾斜面との間に空気流路（４２０）が形成され、前記吹出口から送出された空気（Ｆｂ２）は、前記空気流路を通って膨出部内に循環される。【選択図】図４