CN-122025980-A - Battery module and method for manufacturing same

Abstract

The present disclosure relates to a battery module. In particular, the present disclosure relates to a battery module that reinforces a welded structure of a case accommodating a battery cell assembly. A battery module according to one embodiment of the present disclosure includes a cell assembly including cells stacked in a front-rear direction, a case accommodating the cell assembly, and one or more bus bar assemblies accommodated in the case and connected to the case, the case including a pressing case facing the cell assembly in the front-rear direction, the one or more bus bar assemblies each including a bus bar extending in the front-rear direction, and a fixing module fastened to the bus bar and the pressing case and adjusting a distance between the bus bar and the pressing case.

Inventors

• Jin Zhenkuan

Assignees

• SK新能源株式会社

Dates

Publication Date

20260512

Application Date

20250624

Priority Date

20241112

Claims (15)

1. 1. A battery module, comprising: The battery cell assembly comprises battery cells stacked and arranged along the front-back direction; A housing accommodating the cell assembly, and One or more busbar assemblies housed in the housing and connected to the housing, The housing includes a pressing housing facing the cell assembly in a front-rear direction, The one or more busbar assemblies each include: A bus bar extending in the front-rear direction, and A fixing module fastened to the bus bar and the pressing case and adjusting a distance between the bus bar and the pressing case.
2. 2. The battery module of claim 1, wherein, The fixing module includes: a fixing nut coupled to the bus bar, and A fixing bolt rotatably coupled to the fixing nut, The fixing nut is formed in a stepped shape.
3. 3. The battery module of claim 2, wherein, The fixing nut includes: fixing the nut body And a fixing nut outer rotating part extending from the fixing nut body, and having a diameter smaller than that of the fixing nut body.
4. 4. The battery module according to claim 2 or 3, wherein, The fixing bolt is coupled to a fixing nut penetration hole formed through the fixing nut in an axial direction.
5. 5. The battery module of claim 4, wherein, The fixing bolt includes: a fixing bolt rotating part coupled to the fixing nut through-hole, and A fixing bolt body extending in an axial direction from the fixing bolt rotating portion, The fixing bolt has a stepped shape.
6. 6. The battery module of claim 5, wherein, The diameter of the fixing bolt body is larger than that of the fixing bolt rotating portion.
7. 7. The battery module according to any one of claims 1 to 6, wherein, The bus bar includes: Bus bar housing A nut installation space formed in the bus bar housing, The fixing module is accommodated in the nut installation space.
8. 8. The battery module of claim 7, wherein, The bus bar further includes: A bolt penetration hole formed in the bus bar housing, The bolt through hole is communicated with the nut installation space, The fixing module passes through the bolt through hole.
9. 9. The battery module according to any one of claims 1 to 6, wherein, The pressurized housing includes: A first pressurizing housing forming a front surface of the battery module, and And a second pressurizing housing forming a rear surface of the battery module.
10. 10. The battery module of claim 9, wherein, The first and second pressurized housings each include: pressure housing plate A pressing case plate hole formed in the pressing case plate, The fixing bolt passes through the pressure housing plate hole.
11. 11. The battery module according to any one of claims 1 to 6, wherein, The cell assembly includes: a plurality of sub-cell groups including the plurality of cells, and And the pad is arranged among the plurality of sub-cell groups.
12. 12. The battery module according to any one of claims 1 to 6, wherein, The fixing modules are symmetrically arranged on two sides of the bus bar along the front-back direction.
13. 13. The battery module according to any one of claims 1 to 6, wherein, The bus bar assembly includes: a first bus bar assembly disposed at one side of the cell assembly, and And the second bus bar assembly is arranged on the other side of the battery cell assembly.
14. 14. A method of assembling a battery module, comprising the steps of: arranging a battery cell assembly, wherein the battery cell assembly comprises battery cells stacked and arranged along the front-back direction; providing a pressurized housing forming a housing containing the cell assembly; providing a bus bar assembly in the front-rear direction within the housing, and Adjusting a distance between the busbar assembly and the housing using the busbar assembly, The bus bar assembly includes: A bus bar extending in the front-rear direction, and A fixing module fastened to the bus bar and the pressing case and adjusting a distance between the bus bar and the pressing case.
15. 15. The method of assembling a battery module according to claim 14, comprising the steps of: After the bus bar assembly is disposed within the housing, an insert housing is disposed, the insert housing forming a housing that houses the cell assembly, The step of adjusting the distance between the busbar assembly and the housing ends upon contact between the insert housing and the pressurized housing.

Description

Battery module and method for manufacturing same Technical Field The present disclosure relates to a battery module. Background In order to ensure the life of a cell assembly forming a battery module and absorb the tolerance of the cell assembly during the assembly of the battery module, it is necessary to compress a mat that can be disposed between a plurality of cells forming the cell assembly to some extent. The battery module assembly process may include an operation of disposing front and rear cases in front and rear of the stacked battery cell assemblies and fixing with jigs, and inserting the upper and lower cases in the above-described state. On the other hand, in the welding bonding process of the front and rear cases and the upper and lower cases, when the weld gap (gap) between the cases becomes large, the welding quality is lowered, possibly resulting in insufficient welding strength. Disclosure of Invention First, the technical problem to be solved The present disclosure (disclosure) relates to a battery module that improves the weld quality of a housing that houses a battery cell assembly. The present disclosure relates to a battery module that is connected and assembled between a case and a bus bar assembly using a fixed module of which the distance is adjustable, whereby a welding gap (WELDING GAP) between a pressing case forming the case and an insertion case can be managed. (II) technical scheme The battery module according to one embodiment of the present disclosure may include a cell assembly including cells stacked in a front-rear direction, a case accommodating the cell assembly, and one or more bus bar assemblies accommodated in the case and connected to the case, the case may include a pressurizing case facing the cell assembly in the front-rear direction, the one or more bus bar assemblies may each include bus bars extending in the front-rear direction, and a fixing module fastened to the bus bars and the pressurizing case and adjusting a distance between the bus bars and the pressurizing case. The fixing module may include a fixing nut coupled to the bus bar, and a fixing bolt rotatably coupled to the fixing nut. The fixing nut may be formed in a stepped shape. The fixing nut may include a fixing nut body, and a fixing nut outer rotating part extending from the fixing nut body, and having a diameter smaller than that of the fixing nut body. The fixing bolt may be coupled to a fixing nut penetration hole formed through the fixing nut in an axial direction. The fixing bolt may include a fixing bolt rotating portion coupled to the fixing nut through-hole, and a fixing bolt body extending from the fixing bolt rotating portion in an axial direction. The fixing bolt may have a stepped shape. The fixing bolt body may have a diameter larger than that of the fixing bolt rotating portion. The bus bar may include a bus bar housing, and a nut installation space formed at the bus bar housing, and the fixing module may be accommodated in the nut installation space. The bus bar may further include a bolt penetration formed at the bus bar housing, and the bolt penetration may communicate with the nut installation space. The fixing module may pass through the bolt through-hole. The pressurizing housing may include a first pressurizing housing forming a front surface of the battery module, and a second pressurizing housing forming a rear surface of the battery module. The first and second pressure housings may each include a pressure housing plate, and a pressure housing plate hole formed in the pressure housing plate through which the fixing bolt may pass. The cell assembly may include a plurality of sub-cell groups including the plurality of cells, and a pad disposed between the plurality of sub-cell groups. The fixing modules may be symmetrically disposed at both sides of the bus bar in the front-rear direction. The bus bar assembly may include a first bus bar assembly disposed at one side of the cell assembly and a second bus bar assembly disposed at the other side of the cell assembly. A method of assembling a battery module according to one embodiment of the present disclosure may include arranging a cell assembly including cells stacked in a front-rear direction, providing a pressing case forming a case accommodating the cell assembly, providing a bus bar assembly in the front-rear direction within the case, and adjusting a distance between the bus bar assembly and the case using the bus bar assembly, the bus bar assembly may include a bus bar extending in the front-rear direction, and a fixing module fastened to the bus bar and the pressing case and adjusting a distance between the bus bar and the pressing case. After the bus bar assembly is disposed in the housing, an insertion housing forming a housing accommodating the battery cell assembly may be disposed, and the step of adjusting the distance between the bus bar assembly and the housing may be ended at the time of contact between the i