Power source circuit shut off apparatus

1. A power source circuit shut off apparatus for shutting off a circuit of a battery assembly in which plural battery cells connected in series are arranged in parallel, comprising:

a housing;

a pair of bus bars that is arranged in the housing and is connected to the adjacent battery cells respectively;

a switch section that is adapted to conduct electrical connection or disconnection between the pair of bus bars; and

a retaining member which is formed on the housing and is configured to be retained to a resin frame part of a side surface of the battery cell,

wherein the retaining member has a claw part which is projected from the housing and is locked in a locking hole formed in the resin frame part of the side surface of the battery cell.

2. The power source circuit shut off apparatus according to claim 1 , wherein the switch section includes an interlock switch which switches to open or close a main circuit of the battery assembly in a state that the electrical connection is conducted between the pair of bus bars.

3. The power source circuit shut off apparatus according to claim 2 , further comprising:

a switch plug which has a connecting terminal for conducting the electrical connection between the pair of bus bars and is fitted into the housing; and

a lever which is turnably attached to the switch plug and is turned when the switch plug is completely fitted into the housing,

wherein the interlock switch is actuated by a turning operation of the lever.