Battery connection body and battery pack provided with the battery connection body

1. A battery connection body comprising:

a plurality of connection conductors which electrically connect respective battery cells forming a battery assembly;

a casing to which the connection conductors are mounted, and which comprises a first side and a second side different from the first side; and

a plurality of first electric wires and a plurality of second electric wires, which are wired in the casing,

wherein the casing comprises:

a connection conductor mounting portion;

a first electric wire housing portion; and

a second electric wire housing portion,

wherein the first side of the casing is opposite to the second side of the casing in a direction perpendicular to a longitudinal arrangement of the plurality of the first and second electric wires,

wherein the connection conductors are mounted to the connection conductor mounting portion from the first side of the casing,

wherein the first electric wires are configured to be received into the first electric wire housing portion from a first direction,

wherein the second electric wires are configured to be received into the second electric wire housing portion from a second direction opposite to the first direction, and

wherein the electric wires are voltage detection lines and the second electric wires are thermistor lines.

2. The battery connection body according to claim 1 ,

wherein the first side of the casing is a back side of the casing, and

wherein the second side of the casing is a front side of the casing.

3. The battery connection body according to claim 1 ,

wherein the first electric wire housing portion and the second electric wire housing portion are provided adjacently to each other, and

wherein the first electric wire housing portion and the second electric wire housing portion are defined by a part of the casing.

4. The battery connection body according to claim 1 ,

wherein the first electric wires are connected to the connection conductors.

5. A battery pack comprising:

the battery connection body according to claim 1 ; and

the battery assembly in which the battery cells are electrically connected by the battery connection body.

6. The battery pack according to claim 5 ,

wherein the first electric wire housing portion has at least three sides to secure the first electric wires and an opening portion that is open on the first side of the casing, and

wherein the opening portion is closed with the battery assembly.

7. The battery pack according to claim 1 , wherein the case further comprises:

a plurality of thermistor mounting portions arranged at a plurality of places in the longitudinal direction.

8. The battery pack according to claim 7 , wherein the thermistor mounting portions are provided with two guide grooves.

9. The battery pack according to claim 8 , wherein the thermistor mounting portions house thermistors having two guide ribs corresponding to the two guide grooves.

10. The battery pack according to claim 1 , wherein the second electric wire housing portion includes claws for holding the second electric wires in place.

11. The battery pack according to claim 1 , wherein the second electric wire housing includes a wall closing a portion of the second electric wire housing to secure the second electric wires.