Battery module with improved current-flow ability
A battery module includes multiple cell laminations and a conductive plate. The cell laminations are laminated along vertical direction and includes at least a first cell lamination and a second cell lamination. Each cell lamination includes several cells laminated together and a busbar, the busbar includes a connection portion and a current-flow portion, the connection portion electrically connects with lugs of the cells, and further connects with the current-flow portion. The conductive plate is located beside the cell laminations. A first end of the conductive plate at least electrically connects with the current-flow portion of the busbar in the first cell lamination, and a second end thereof at least electrically connects with the current-flow portion of the busbar in the second cell lamination. The present disclosure provides a battery module which can solve the problem of impossible to consider current-flow ability, energy density and welding effect simultaneously.
1. A battery module, comprising:
several cell laminations laminated together along a laminating direction, which comprises at least a first cell lamination and a second cell lamination, each cell lamination comprises multiple cells laminated together and a busbar, the busbar comprises a connection portion and a current-flow portion, the connection portion electrically connects with lugs of the cells, and connects with the current-flow portion; and
a conductive plate located beside the cell laminations, the conductive plate is a single piece with different portions thereof being made of same material, a first end of the conductive plate at least electrically connects with the current-flow portion of the busbar in the first cell lamination, and a second end of the conductive plate at least electrically connects with the current-flow portion of the busbar in the second cell lamination, the first end and the second end thereof are opposite to each other along the laminating direction.
2. The battery module according to claim 1 , wherein the current-flow portion of each busbar comprises a first current-flow portion and a second current-flow portion, the first current-flow portion and the second current-flow portion locate at opposite sides of the busbar, the connection portion is sandwiched between the first current-flow portion and the second current-flow portion.
3. The battery module according to claim 2 , wherein the conductive plate comprises a first conductive plate and a second conductive plate, the first conductive plate comprises a first end and a second end opposite to each other along the laminating direction, the first end of the first conductive plate electrically connects and contacts with the first current-flow portion of the busbar in the first cell lamination, and the second end of the first conductive plate electrically connects and contacts with the first current-flow portion of the busbar in the second cell lamination; the second conductive plate comprises a first end and a second end opposite to each other along the laminating direction, and the first end of the second conductive plate electrically connects and contacts with the second current-flow portion of the busbar in the first cell lamination, and the second end of the second conductive plate electrically connects and contacts with the second current-flow portion of the busbar in the second cell lamination.
4. The battery module according to claim 3 , wherein the first conductive plate contacts with the middle part of the first current-flow portion along the laminating direction, and the second conductive plate contacts with the middle part of the second current-flow portion along the laminating direction.
5. The battery module according to claim 3 , wherein the first conductive plate further comprises a left end away from the second conductive plate, which is parallel to the laminating direction and perpendicular to the first end; the second conductive plate further comprises a right end away from the first conductive plate, which is also parallel to the laminating direction and perpendicular to the first end; the left end of the first conductive plate electrically connects with the first current-flow portion of the busbar, and the right end of the second conductive plate electrically connects with the second current-flow portion of the same busbar.
6. The battery module according to claim 3 , wherein the first end of the conductive plate electrically connects with the first current-flow portion of one busbar, and the second end of the same conductive plate electrically connects with the first current-flow portion of different busbars.
7. The battery module according to claim 2 , wherein the number of the conductive plate is one, the conductive plate comprises a left end and a right end opposite to each other and parallel to the laminating direction; the left end of the conductive plate electrically connects with the first current-flow portions of different busbars, and the right end of the conductive plate electrically connects with the second current-flow portions of said different busbars above.
8. The battery module according to claim 7 , wherein the conductive plate comprises a first end and a second end opposite to each other along the lamination direction, the first end of the conductive plate electrically connects with the first current-flow portion and the second current-flow portion of the one busbar separately; and the second end of the conductive plate electrically connects with the first current-flow portion and the second current-flow portion of another busbar separately.
9. The battery module according to claim 1 , wherein the conductive plate contacts with a side/sides of the busbar away from the cells and covers the busbar.
10. The battery module according to claim 1 , wherein lug-holes are mounted in the connection portion, and the lugs of the cells electrically connect with the connection portion through the lug-holes.
11. The battery module according to claim 1 , wherein the conductive plate contacts with a middle part of the current-flow portion along the laminating direction.
12. The battery module according to claim 1 , wherein the conductive plate at least covers the current-flow portion of the busbar.
13. The battery module according to claim 1 , wherein a contact area between the conductive plate and single busbar is no less than 5 mm 2 .
14. The battery module according to claim 1 , wherein a minimum current-flow area of the conductive plate is no less than 5 mm 2 .
15. The battery module according to claim 1 , wherein the conductive plate is made of conductive metal plate.
16. The battery module according to claim 1 , wherein the conductive plate is made of copper plate or aluminum plate.
17. The battery module according to claim 1 , wherein the conductive plate is fixed to the current-flow portion of the busbar by ultrasonic welding, polymer diffusion welding or brazing/soldering.
18. The battery module according to claim 1 , wherein the busbar is located between the conductive plate and the cell laminations and contacts with both.