Battery module and assembling method thereof

1. A battery module, comprising a plurality of batteries and a plurality of busbar components, wherein

the plurality of batteries are arranged consecutively along a longitudinal direction of the battery module, and each battery comprises a first electrode terminal and a second electrode terminal;

the plurality of busbar components are connected to the plurality of batteries;

the plurality of batteries comprise a first battery and a second battery, and the first electrode terminal of the first battery and the first electrode terminal of the second battery are arranged along the longitudinal direction;

the plurality of busbar components comprise a first busbar component, and the first busbar component comprises a first part, a second part, and a third part;

the first part is connected to the first electrode terminal of the first battery, the second part is connected to the second electrode terminal of the second battery, and the third part connects the first part and the second part; and

a through hole is provided on the third part; and the third part comprises a first edge, and the first edge slants against the longitudinal direction and a transverse direction of the battery module; and

the through hole has a strip shape and extends along a direction parallel to the first edge.

2. The battery module according to claim 1 , wherein

each battery comprises an explosion-proof valve, the explosion-proof valve is located between the first electrode terminal and the second electrode terminal of the battery; and

at least a part of the through hole is located above the explosion-proof valve.

3. The battery module according to claim 2 , wherein the through hole is provided above the explosion-proof valve of the first battery and above the explosion-proof valve of the second battery.

4. The battery module according to claim 1 , wherein there are a plurality of through holes.

5. The battery module according to claim 1 , wherein

the third part comprises a plurality of fusing regions, and the plurality of fusing regions are arranged along a direction perpendicular to the first edge;

the through hole is disposed between two adjacent fusing regions; and

at least two fusing regions differ in width along the direction perpendicular to the first edge.

6. The battery module according to claim 5 , wherein the plurality of fusing regions differ in width along the direction perpendicular to the first edge.

7. The battery module according to claim 5 , wherein the plurality of fusing regions have an increasing width along a direction away from the first edge.

8. The battery module according to claim 7 , wherein a cross-sectional area difference between two adjacent fusing regions is 5 mm 2 to 10 mm 2 .

9. The battery module according to claim 1 , wherein

a width of the through hole along a direction perpendicular to the first edge is 1 mm to 5 mm; and

a length of the through hole along a direction parallel to the first edge is 10 mm to 20 mm.

10. The battery module according to claim 1 , wherein

the plurality of batteries further comprise a third battery, and the first battery, the second battery, and the third battery are arranged consecutively; and

the plurality of busbar components further comprise a second busbar component, and the second busbar component connects the second electrode terminal of the first battery and the first electrode terminal of the third battery.

11. The battery module according to claim 10 , wherein the second busbar component passes under the first busbar component and over the second battery.

12. The battery module according to claim 11 , wherein an insulating strip is provided between the second busbar component and the first busbar component.

13. The battery module according to claim 10 , wherein

the plurality of busbar components further comprise a plurality of third busbar components, and each third busbar component connects batteries that are spaced apart; and

the first busbar component, the second busbar component, and the plurality of third busbar components are electrically connected to the plurality of batteries.

14. The battery module according to claim 1 , wherein

the battery module further comprises two output electrode plates that are respectively connected to the first electrode terminal and the second electrode terminal that serve as main output electrodes of the battery module; and

the two output electrode plates protrude from an end of the battery module that is further away from the first battery.

15. A method for assembling a battery module, comprising:

arranging a plurality of batteries with a first electrode terminal and a second electrode terminal consecutively along a longitudinal direction of the battery module; and

connecting a plurality of busbar components to the electrode terminals of the plurality of batteries;

wherein the plurality of batteries comprise a first battery and a second battery, and the first electrode terminal of the first battery and the first electrode terminal of the second battery are arranged along the longitudinal direction; and

a through hole is provided on a busbar component that connects the first electrode terminal of the first battery and the second electrode terminal of the second battery, and the through hole is located between the first electrode terminal of the first battery and the second electrode terminal of the second battery; and wherein,

the third part comprises a first edge, and the first edge slants against the longitudinal direction and a transverse direction of the battery module; and

the through hole has a strip shape and extends along a direction parallel to the first edge.

16. The method for assembling a battery module according to claim 15 , further comprising:

connecting two output electrode plates respectively to the first electrode terminal and the second electrode terminal that serve as main output electrodes in the battery module, and protruding the two output electrode plates from an end of the battery module that is further away from the first battery.