SECONDARY BATTERY AND SECONDARY BATTERY HEATING SYSTEM

To provide a secondary battery and a secondary battery heating system, which suppress temperature unevenness, thereby capable of sufficiently suppressing a drop in output.SOLUTION: A secondary battery 10 includes a first current collector 1, a separator 3, and a second current collector 2 in order in a thickness direction. The first current collector 1 includes a first negative electrode active material layer 11, a first current collector layer 12, and a first positive electrode active material layer 13 in order in the thickness direction. The second current collector 2 includes a second negative electrode active material layer 21, a second current collector layer 22, and a second positive electrode active material layer 23 in order in the thickness direction. A first heater 15 is partially arranged on one side 12S of the first current collector layer 12. A second heater 24 is partially arranged on one side 22S of the second current collector layer 22. The second heater 24 is located on an opposite side of the first heater 15 with respect to the separator 3. The first heater 15 includes a non-overlapping area 15A. The non-overlapping area 15 is an area where the first heater 15 and the second heater 24 does not overlap with each other in the thickness direction.SELECTED DRAWING: Figure 1 【課題】温度のムラを抑制し、出力の低下を十分に抑制できる二次電池および二次電池加熱システムを提供する【解決手段】二次電池１０は、第１集電部１と、セパレータ３と、第２集電部２とを厚み方向に順に備える。第１集電部１は、第１負極活物質層１１と、第１集電体層１２と、第１正極活物質層１３と、を厚み方向に順に備える。第２集電部２は、第２負極活物質層２１と、第２集電体層２２と、第２正極活物質層２３と、を厚み方向に順に備える。第１ヒータ１５は、第１集電体層１２の一方面１２Ｓに対して部分的に配置される。第２ヒータ２４は、第２集電体層２２の一方面２２Ｓに対して部分的に配置される。第２ヒータ２４は、セパレータ３に対して第１ヒータ１５の反対側に位置する。第１ヒータ１５は、非重複領域１５Ａを含む。非重複領域１５Ａは、厚み方向において、第１ヒータ１５と第２ヒータ２４とが重ならない領域である。【選択図】図１