A module battery comprising: two or more strings that are connected in parallel, each of said two or more strings including: two or more cells that are connected in series; and a fuse that is connected in series to said two or more cells and that is blown when a current higher than or equal to a fusing current flows, wherein combustion of each of said two or more cells does not occur when heat generated per unit time by the cell is less than or equal to an upper limit and combustion of each of said two or more cells may occur when heat generated per unit time by the cell is more than said upper limit, a failure is defined as a case where said two or more strings include a fault string , and said two or more cells that belong to said fault string include a short-circuited cell , the number of said two or more cells that are connected in series is determined to be less than or equal to a threshold value, within which electric power supplied during charging and converted into heat in said short-circuited cell in the event of said failure reaches said upper limit, and said fusing current matches with a charging current that flows to said fault string when the electric power supplied during charging and converted into heat in said short-circuited cell in the event of said failure reaches said upper limit. two or more strings that are connected in parallel, each of said two or more strings including: two or more cells that are connected in series; and a fuse that is connected in series to said two or more cells and that is blown when a current higher than or equal to a fusing current flows, wherein combustion of each of said two or more cells does not occur when heat generated per unit time by the cell is less than or equal to an upper limit and combustion of each of said two or more cells may occur when heat generated per unit time by the cell is more than said upper limit, a failure is defined as a case where said two or more strings include a fault string , and said two or more cells that belong to said fault string include a short-circuited cell , the number of said two or more cells that are connected in series is determined to be less than or equal to a threshold value, within which electric power supplied during charging and converted into heat in said short-circuited cell in the event of said failure reaches said upper limit, and said fusing current matches with a charging current that flows to said fault string when the electric power supplied during charging and converted into heat in said short-circuited cell in the event of said failure reaches said upper limit. two or more cells that are connected in series; and a fuse that is connected in series to said two or more cells and that is blown when a current higher than or equal to a fusing current flows, wherein combustion of each of said two or more cells does not occur when heat generated per unit time by the cell is less than or equal to an upper limit and combustion of each of said two or more cells may occur when heat generated per unit time by the cell is more than said upper limit, a failure is defined as a case where said two or more strings include a fault string , and said two or more cells that belong to said fault string include a short-circuited cell , the number of said two or more cells that are connected in series is determined to be less than or equal to a threshold value, within which electric power supplied during charging and converted into heat in said short-circuited cell in the event of said failure reaches said upper limit, and said fusing current matches with a charging current that flows to said fault string when the electric power supplied during charging and converted into heat in said short-circuited cell in the event of said failure reaches said upper limit. <EOS>