Interlocking structure of battery system

The invention provides an interlocking structure of a battery system, which improves the configuration freedom degree of two batteries and prevents the two batteries from being forgotten to be blocked during maintenance. A battery system is provided with: a first battery module 21; a second battery module 31; a first maintenance plug (7) that blocks the first battery module (21) from the power circuit (5) when separated from the first battery module (21); a second maintenance plug (8) that blocks the second battery module (31) from the power circuit (5) when separated from the second battery module (31); and a lock mechanism that locks the second maintenance plug 8, and the first maintenance plug 7 is provided with a lock release key for releasing the lock of the second maintenance plug 8 by the lock mechanism. 本发明提供一种电池系统的联锁结构，其提高两个电池的配置自由度，并且防止在维护时忘记阻断两个电池。电池系统具备：第一电池模块21；第二电池模块31；第一维护插头7，若从第一电池模块21脱离则将第一电池模块21从电力回路5阻断；第二维护插头8，若从第二电池模块31脱离则将第二电池模块31从电力回路5阻断；以及锁定机构，将第二维护插头8锁定，第一维护插头7具备：锁定解除键，用于解除锁定机构对第二维护插头8