In-vehicle electric storage device

1. An in-vehicle electric storage device, comprising:

a battery block including a metal casing and a plurality of battery cells accommodated in the metal casing;

a control unit including a metal cabinet and a circuit board accommodated in the metal cabinet on which an electronic component is mounted, the control unit being set up on a top side of the battery block and monitoring a physical state of each of the plurality of the battery cells; wherein

the cabinet includes a case having a bottom plate and an open top surface and a cover that closes the open top surface of the case,

the case has an internal boss and an external boss on the bottom plate, the internal boss protruding toward inside of the case from a top side of the bottom plate and the external boss protruding toward outside the case from a bottom side of the bottom plate,

the circuit board is set up on a top side of the internal boss, and

a top side of the casing is provided with a depressed portion in which the external boss is accommodated.

2. An in-vehicle electric storage device according to claim 1 , wherein

the in-vehicle electric storage device includes a plurality of the battery blocks, and

the cabinet is connected and fixed to a top side of the plurality of the battery blocks so as to bridge them.

3. An in-vehicle electric storage device according to claim 1 , wherein

a connector that is mounted on the circuit board, a lead of the connector protruding from a bottom side of the circuit board, and

the bottom plate of the case is provided with an opening that faces the connector.

4. An in-vehicle electric storage device according to claim 1 , wherein a heat conduction member that causes the circuit board and the case to thermally contact each other is provided on the top side of the bottom plate, and the heat conduction member is contacting the circuit board.

5. An in-vehicle electric storage device according to claim 3 , wherein

assuming a protrusion length of the lead that protrudes from the bottom side of the circuit board is S 1 , a protrusion height of an internal boss of the bottom plate is S 2 , and a distance between an extremity of the internal boss and a top side of the casing of the battery block is S 3 , S 1 , S 2 and S 3 satisfy a relationship of:

S 2 <S 1 <S 3.

6. An in-vehicle electric storage device according to claim 5 , wherein

the opening of the case is blocked by a blocking plate fixed to an outer side of the case, and

assuming that a distance between the extremity of the internal boss and a top side thereof that faces the circuit board is S 4 , S 1 , S 2 and S 4 satisfy a relationship of:

S 2 <S 1 <S 4.

7. An in-vehicle electric storage device according to claim 6 , wherein

the blocking plate is a metal plate having provided an insulating material on one surface thereof that faces an inside of the cabinet, a metal plate having provided an insulating material on each side thereof, or a metal plate having no insulating material on each side thereof.

8. An in-vehicle electric storage device according to claim 6 , wherein

a protrusion surrounding the opening is provided on the bottom side of the bottom plate,

the blocking plate is provided at a stepped portion surrounded by the protrusion, and

assuming that a thickness of the blocking plate is S 5 , and a protrusion height of the protrusion is S 6 , S 5 and S 6 satisfy a relationship of:

S 5≦ S 6.

9. An in-vehicle electric storage device according to claim 6 , wherein

a protrusion surrounding the opening is provided on a bottom side of the bottom plate,

the blocking plate is provided at a stepped portion surrounded by the protrusion, and

assuming that a thickness of the blocking plate is S 5 , a protrusion height of the protrusion is S 6 , and a distance between the protrusion and the top side of the casing of the battery block is S 7 , S 5 , S 6 and S 7 satisfy a relationship of:

S 6 <S 5<( S 6 +S 7).

10. An in-vehicle electric storage device according to claim 1 , wherein

a plurality of bosses that protrude outward is provided on a side surface of the case,

the cover is provided with a plurality of bosses that protrude laterally along each boss of the case, a top side of each of the plurality of bosses of the cover protrudes by a difference in level S 8 lower than a top side of the cover,

the bosses of the case and the bosses of the cover are fastened with screws, each of the screws contains a top surface area that protrudes upward from the top side of the bosses of the case by a height S 9 , and

S 8 and S 9 satisfy a relationship of:

S 9 <S 8.