Sealed battery, battery pack and battery for engine ignition

An assembled battery comprising a first sealed battery and a second sealed battery, wherein

• each of the first and second sealed batteries comprises:
• an electrode assembly including a positive electrode, a negative electrode, and a separator;
• an electrolyte;
• a case which contains the electrode assembly and the electrolyte;
• a first lead terminal;
• and a second lead terminal,
• each of the first lead terminal and the second lead terminal comprises an electrode connection section which is connected to the positive electrode or the negative electrode inside the case, an external connection section positioned outside the case, and a sealing section to which the case is bonded via an adhesive layer,
• the external connection section is configured to be directly physically connected to an external connection section of another adjacent sealed battery so as to charge or discharge the first or second sealed battery including the electrode assembly,
• each of the first lead terminal and the second lead terminal is formed of a metal plate and has a tab serving as the external connection section, wherein the tab projects outward from the case,
• the first lead terminal or the second lead terminal comprises a conduction section serving as a conduction path between the sealing section and the external connection section, the conduction section not serving as the external connection section,
• the conduction section is configured to occupy 50% or more of the first or the second lead terminal and is configured to provide the external connection section at a position distant from the sealing section,
• the conduction section included in the first sealed battery is provided to be at least partially in contact with an outer surface of the case included in the second sealed battery directly or provided to be at least partially in contact with the outer surface of the case included in the second sealed battery indirectly via an intermediate layer, wherein a contact portion of the conduction section is provided on the electrode assembly so as to at least partially overlap the electrode assembly via the outer surface of the case,
• the case included in the second sealed battery has a conductivity or an apparent thermal conductivity of from 10 W/(mK) to 250 W/(mK) inclusive, and
• the electrode assembly and the electrolyte contained in the case included in the second sealed battery have an effective thermal conductivity of from 10 W/(mK) to 100 W/(mK) inclusive in a steady state.