Battery pack having fixing device using magnetic force, manufacturing method thereof, method for replacing battery cell of battery pack

1 . A battery pack comprising:

a battery pack housing;

a plurality of battery cells in the battery pack housing;

a fixing unit in the battery pack housing and configured to fix a position of the plurality of battery cells by a magnetic force; and

a busbar assembly on the fixing unit, wherein a hole is defined in the fixing unit so that the busbar assembly passes through the fixing unit to contact a respective electrode of each of the plurality of battery cells.

2 . The battery pack of claim 1 , wherein the fixing unit comprises:

a plurality of first members respectively attached and coupled to top surfaces of the plurality of battery cells by the magnetic force; and

a second member having a size corresponding to that of a bottom surface of a battery pack housing upper cover and attached and coupled to the plurality of first members by the magnetic force.

3 . The battery pack of claim 1 , wherein the fixing unit comprises:

a plurality of first members respectively attached and coupled to bottom surfaces of the plurality of battery cells by the magnetic force; and

a second member having a size corresponding to that of a bottom surface of a battery pack housing lower case and attached and coupled to the plurality of first members by the magnetic force.

4 . The battery pack of claim 1 , wherein the fixing unit comprises:

a plurality of first members attached and coupled to a top surface and a bottom surface of each of the plurality of battery cells by the magnetic force; and

a plurality of second members respectively above and below the plurality of battery cells and attached and coupled to the plurality of first members by the magnetic force,

wherein the plurality of second members comprises the second member above the plurality of battery cells, which has a size corresponding to that of a bottom surface of a battery pack housing upper cover, and the second member below the plurality of battery cells, which has a size corresponding to that of a bottom surface of a battery pack housing lower case.

5 . The battery pack of claim 2 , wherein the first member has a size corresponding to a top surface or a bottom surface of the battery cell and is coupled with the battery cell in a one-to-one correspondence manner, or the first member has a size greater than that of the top surface or the bottom surface of the battery cell and is coupled with the plurality of battery cells.

6 . The battery pack of claim 2 , wherein the first member is a magnet, and the second member is a magnetic body.

7 . The battery pack of claim 2 , wherein each of the first member and the second member is a magnet, and

wherein the first member and the second member have polarities so that an attractive force is applied between a top surface of the first member and a bottom surface of the second member.

8 . The battery pack of claim 2 , wherein at least a portion of the second member is embedded and coupled to a bottom surface side of the battery pack housing upper cover.

9 . The battery pack of claim 3 , wherein at least a portion of the second member is embedded and coupled to a bottom surface side of the battery pack housing lower case.

10 . The battery pack of claim 1 , wherein an empty space exists or at least one of a spacer and a filling material is between the plurality of battery cells.

11 . The battery pack of claim 2 , wherein the hole is defined in each of the first member and the second member so that the busbar assembly passes therethrough to contact the respective electrode of each of the plurality of battery cells.

12 . The battery pack of claim 11 , wherein the busbar assembly is at an opposite side of the plurality of battery cells based on the second member, passes through the hole defined in the first member and the hole defined in the second member, and is connected to the respective electrode of each of the plurality of battery cells.

13 . The battery pack of claim 2 , wherein the busbar assembly is provided on a surface of the first member and a surface of the second member, wherein the busbar assembly contacts and is connected to the respective electrode of each of the plurality of battery cells.

14 . The battery pack of claim 3 , wherein the hole is defined in each of the first member and the second member so that the busbar assembly passes therethrough to contact the respective electrode of each of the plurality of battery cells.

15 . The battery pack of claim 3 , wherein the busbar assembly is provided on a surface of the first member and a surface of the second member, wherein the busbar assembly contacts and is connected to the respective electrode of each of the plurality of battery cells.

16 . The battery pack of claim 1 , wherein the fixing unit comprises:

a plurality of first members respectively attached and magnetically coupled to respective ends of the plurality of battery cells; and

a second member having a size corresponding to that of a bottom surface of a battery pack housing upper cover, the second member being attached and magnetically coupled to the plurality of first members.

17 . The battery pack of claim 16 , wherein the hole is defined in each of the first member and the second member so that the busbar assembly passes therethrough to contact the respective electrode of each of the plurality of battery cells.

18 . The battery pack of claim 16 , wherein the busbar assembly is provided on a surface of the first member and a surface of the second member, wherein the busbar assembly contacts and is connected to the respective electrode of each of the plurality of battery cells.

19 . The battery pack of claim 1 , wherein the fixing unit comprises a magnet, and wherein the fixing unit is attached to and coupled to the plurality of battery cells by the magnetic force.