Laminated battery cell and battery pack

The invention provides a laminated battery cell and a battery pack which can properly arrange detection lines and can realize miniaturization. A laminated battery cell (10) is provided with: an electrode body (11); tab pins (12, 13) connected to the electrode body (11); and an outer packaging body (20) which accommodates the electrode body (11) in a manner that the tab pins (12, 13) are exposed, and is formed by a laminated film. The exterior body (20) is provided with: an electrode body housing part (23) that houses the electrode body (11); and an ear section (24) that extends to the outside of the electrode body housing section (23). At least one of the temperature detection lines (16) and the voltage detection lines (14, 15) is disposed in a folded-back section (25) obtained by folding back the ear section (24), and is disposed so as to overlap the electrode body housing section (23). 本发明提供一种能够适当地对检测线进行布局、能够实现小型化的层压型电池单元以及电池组。层压型电池单元(10)具备：电极体(11)；极耳引脚(12、13)，其连接到电极体(11)；以及外装体(20)，其以露出极耳引脚(12、13)的方式收纳电极体(1