Battery module and manufacturing method thereof

Abstract

The present disclosure relates to a battery module. In particular, the present disclosure relates to a battery module for reinforcing a welding structure of a housing for accommodating a cell assembly. The battery module according to one embodiment of the present disclosure comprises: a battery cell assembly comprising battery cells stacked and arranged in a front-back direction; the shell is used for accommodating the battery cell assembly; and one or more bus bar assemblies accommodated in the case and connected to the case, the case including a pressurized case facing the cell assembly in a front-back direction, each of the one or more bus bar assemblies including: a bus bar extending in the front-back direction; and a fixing module which is fastened to the bus bar and the pressure housing and adjusts a distance between the bus bar and the pressure housing.

Description

Technical Field

[0001] This disclosure relates to a battery module. Background Technology

[0002] In the process of assembling battery modules, in order to ensure the lifespan of the cell assemblies that form the battery module and to absorb the tolerances of the cell assemblies, it is necessary to compress the pads that can be placed between the multiple cells that form the cell assemblies to a certain extent.

[0003] The battery module assembly process may include setting a front housing and a rear housing in front of and behind the stacked cell assembly and fixing them with clamps, and inserting the upper housing and the lower housing in the above state.

[0004] On the other hand, during the welding process of the front and rear shells and the upper and lower shells, when the weld gap between the shells becomes larger, the welding quality decreases, which may lead to insufficient welding strength. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] This disclosure relates to a battery module for improving the welding quality of a housing that accommodates battery cell components.

[0007] This disclosure relates to a battery module that is assembled between a housing and a busbar assembly using a fixed module with adjustable distance, thereby managing the welding gap between the pressurized housing and the insert housing that form the housing.

[0008] (II) Technical Solution

[0009] A battery module according to an embodiment of the present disclosure may include: a cell assembly including cells stacked in a front-rear direction; a housing housing the cell assembly; and one or more busbar assemblies housing in and connected to the housing, the housing including a pressurized housing facing the cell assembly in a front-rear direction, each of the one or more busbar assemblies including: a busbar extending in a front-rear direction; and a fixing module fastened to the busbar and the pressurized housing and adjusting the distance between the busbar and the pressurized housing.

[0010] The fixing module may include: a fixing nut, which is attached to the busbar; and a fixing bolt, which is rotatably attached to the fixing nut.

[0011] The fixing nut can be formed into a stepped shape.

[0012] The fixing nut may include: a fixing nut body; and an outer rotating portion extending from the fixing nut body, wherein the diameter of the outer rotating portion is smaller than the diameter of the fixing nut body.

[0013] The fixing bolt can be engaged with the fixing nut through-hole formed axially through the fixing nut.

[0014] The fixing bolt may include: a fixing bolt rotating part, which is engaged with the fixing nut through-hole; and a fixing bolt body, which extends axially from the fixing bolt rotating part.

[0015] The fixing bolts may have a stepped shape.

[0016] The diameter of the main body of the fixing bolt can be larger than the diameter of the rotating part of the fixing bolt.

[0017] The busbar may include: a busbar housing; and a nut mounting space formed in the busbar housing, wherein the fixing module can be accommodated in the nut mounting space.

[0018] The busbar may further include a bolt through-hole formed in the busbar housing, the bolt through-hole being in communication with the nut mounting space.

[0019] The fixing module can pass through the bolt through-hole.

[0020] The pressurized housing may include: a first pressurized housing forming the front surface of the battery module; and a second pressurized housing forming the rear surface of the battery module.

[0021] The first pressure housing and the second pressure housing may each include: a pressure housing plate; and a pressure housing plate hole formed in the pressure housing plate, through which the fixing bolt can pass.

[0022] The battery cell assembly may include: a plurality of sub-cell groups, each sub-cell group including the plurality of cells; and a pad disposed between the plurality of sub-cell groups.

[0023] The fixing module can be symmetrically arranged on both sides of the busbar in the front-back direction.

[0024] The busbar assembly may include: a first busbar assembly disposed on one side of the battery cell assembly; and a second busbar assembly disposed on the other side of the battery cell assembly.

[0025] An assembly method for a battery module according to an embodiment of the present disclosure may include the following steps: arranging a battery cell assembly, the battery cell assembly including battery cells stacked in a front-to-back direction; providing a pressure housing, the pressure housing forming a housing for accommodating the battery cell assembly; providing a busbar assembly in the front-to-back direction within the housing; and adjusting the distance between the busbar assembly and the housing using the busbar assembly, the busbar assembly including: a busbar extending in the front-to-back direction; and a fixing module fastened to the busbar and the pressure housing, and adjusting the distance between the busbar and the pressure housing.

[0026] The process may include the following steps: after the busbar assembly is installed inside the housing, an insertion housing is installed, the insertion housing forming a housing that accommodates the battery cell assembly, and the step of adjusting the distance between the busbar assembly and the housing may end when the insertion housing and the pressurized housing come into contact.

[0027] (III) Beneficial Effects

[0028] According to one embodiment of this disclosure, a battery module with improved welding quality of the housing accommodating the battery cell assembly can be provided.

[0029] According to one embodiment of this disclosure, a battery module can be provided that is assembled between a housing and a busbar assembly using a fixed module with adjustable distance, thereby managing the welding gap between the pressurized housing and the insert housing that form the housing. Attached Figure Description

[0030] Figure 1 This is a diagram illustrating a battery module according to an embodiment of the present disclosure.

[0031] Figure 2 Show Figure 1 An enlarged view of region A.

[0032] Figure 3 A busbar assembly according to one embodiment of the present disclosure is shown.

[0033] Figure 4 Showing the cut along A1-A2 Figure 2 The cross-sectional view of the fixing nut is shown.

[0034] Figure 5 Showing the view from above Figure 3 The diagram shows the busbar assembly.

[0035] Figure 6 Showing a view from the front Figure 3 The diagram shows the busbar assembly.

[0036] Figure 7 This illustration shows the state in which the cell assembly and the busbar assembly are arranged between the pressurized housings during the assembly process of the battery module according to this disclosure.

[0037] Figure 8 The diagram illustrates the assembly process of a battery module according to the present disclosure, in which the cell assembly is secured between pressure housings using a fixing module.

[0038] Figure 9 This illustrates the state in which an insert housing is positioned between pressurized housings during the assembly process of a battery module according to the present disclosure.

[0039] Figure 10 The diagram illustrates the assembly process of a battery module according to the present disclosure, in which a fixing module is used to pressurize the cell assembly to minimize the gap between the insertion housing and the pressurized housing. Detailed Implementation

[0040] The following is for reference Figures 1 to 10 This disclosure will be described in detail below. However, this is only an example, and this disclosure is not limited to the specific embodiments described herein.

[0041] The battery module disclosed herein can be applied to pouch cells, cylindrical cells, prismatic cells, etc. The cells 111 forming the battery module can be in the form of winding, stacking, z-folding, or stack-folding.

[0042] In this specification, the coordinate system may be a Cartesian coordinate system. Figure 3 Set the vertical and horizontal directions as the reference.

[0043] The forward and backward directions can be parallel to the X-axis. For example, the positive X-axis direction can represent forward. Similarly, the negative X-axis direction can represent backward.

[0044] The vertical direction can be parallel to the Z-axis. For example, the positive Z-direction can represent upward. Similarly, the negative Z-direction can represent downward.

[0045] The left and right directions can be parallel to the Y-axis. For example, the positive Y-direction can represent the right side. Similarly, the negative Y-direction can represent the left side. The Y-axis can be perpendicular to both the X-axis and Z-axis.

[0046] Reference Figures 1 to 3 The battery module 10 may include a cell assembly 100. The cell assembly 100 may be arranged in a front-to-back direction.

[0047] The battery module 10 may include a busbar assembly 200. The busbar assembly 200 enables electrical connections between the plurality of cells 111 forming the cell assembly 100. The busbar assembly 200 may be disposed on one or both sides of the cell assembly 100. For example, the busbar assembly 200 may be disposed spaced apart on the right or left side of the cell assembly 100.

[0048] The battery module 10 may include a housing 300. The housing 300 may be hollow. The housing 300 may accommodate the cell assembly 100 and the busbar assembly 200.

[0049] The length direction of the battery module 10 can be parallel to the front-to-back direction. The height direction of the battery module 10 can be parallel to the vertical direction. The width direction of the battery module 10 can be parallel to the horizontal direction. The stacking direction of the cell assembly 100 can be parallel to the length direction of the battery module 10.

[0050] The cell assembly 100 may include one or more sub-cell groups 110 and one or more pads 120 disposed adjacent to the one or more sub-cell groups 110.

[0051] There can be multiple sub-cell groups 110 and multiple pads 120. For example, multiple sub-cell groups 110 and multiple pads 120 can be arranged in sequence. For example, multiple sub-cell groups 110 and multiple pads 120 can be arranged in a row along the front-to-back direction.

[0052] A single pad 120 may be arranged adjacently between a pair of sub-cell groups 110. For example, multiple sub-cell groups 110 and multiple pads 120 may be arranged alternately.

[0053] The pad 120 can be in contact with the inner surface of the housing 300. For example, the pads 120 that are located at the front and rearmost positions in a plurality of battery cell assemblies 100 arranged in a row along the front-rear direction can be in contact with the inner surface of the housing 300.

[0054] Sub-cell group 110 may include at least one cell 111. Sub-cell group 110 may include or represent any one or more of a first cell 111A and a second cell 111B.

[0055] Multiple cells 111 forming a sub-cell group 110 can be stacked in the front-to-back direction. For example, a pair of cells 111 including a first cell 111A and a second cell 111B can be arranged in a row in the front-to-back direction.

[0056] Pad 120 can be disposed between sub-cell groups 110. Pad 120 can be disposed on both sides of sub-cell group 110. For example, pad 120 can be disposed in contact with both sides of sub-cell group 110 in the front-back direction.

[0057] The pad 120 can function to block the propagation of heat or flame generated by the cells 111 that make up the sub-cell group 110. Furthermore, during the arrangement of multiple sub-cell groups 110, the overall distance between the multiple sub-cell groups 110 in the front-to-back direction can be adjusted. For example, the pad 120, which contains a compressible elastic material, can adjust the distance between the sub-cell groups 110.

[0058] The busbar assembly 200 can be disposed within the battery module 10. For example, the busbar assembly 200 can be formed on the left or right side of the battery module 10. The busbar assembly 200 can be disposed within the housing 300. For example, the busbar assembly 200 can be disposed within the housing 300 in the front-to-back direction.

[0059] The busbar assembly 200 can be connected to the pressurized housing 310 forming the housing 300. For example, the busbar assembly 200 can be connected to the pressurized housing 310 forming the front and rear surfaces of the battery module 10.

[0060] The battery module 10 may include a first busbar assembly 201 and a second busbar assembly 202. The busbar assembly 200 may include or represent one or more of the first busbar assembly 201 and the second busbar assembly 202.

[0061] The first busbar assembly 201 can be disposed on the right side of the cell assembly 100. The second busbar assembly 202 can be disposed on the left side of the cell assembly 100. The first busbar assembly 201 and the second busbar assembly 202 can be symmetrical about the cell assembly 100.

[0062] The busbar assembly 200 may include a busbar 210. The busbar 210 may be formed in one direction. For example, the busbar 210 may extend forward from one end to the other. The direction of extension of the busbar 210 may be parallel to the length direction of the battery module 10.

[0063] Reference Figure 3 and Figure 4The busbar 210 may include a busbar housing 211. The busbar housing 211 may form the overall appearance of the busbar 210. For example, the busbar housing 211 may be formed into a cuboid shape.

[0064] The busbar housing 211 can be formed in one direction. For example, the busbar housing 211 can extend forward from one end to the other. The extending direction of the busbar housing 211 can be parallel to the length direction of the battery module 10.

[0065] The busbar housing 211 may include a front surface 211F. The front surface of the busbar housing 211F may face or be oriented forward. The front surface 211F may form the front surface of the busbar assembly 200.

[0066] The busbar housing 211 may include a rear surface 211R. The rear surface of the busbar housing 211R may face or face rearward. The rear surface 211R may be spaced apart from the front surface 211F of the busbar housing.

[0067] The rear surface 211R of the busbar housing can be positioned behind the front surface 211F of the busbar housing. The distance between the front surface 211F and the rear surface 211R of the busbar housing can represent the length of the busbar 210.

[0068] The busbar housing 211 may include a busbar housing top surface 211T. The top surface of the busbar housing top surface 211T may face upwards or be oriented upwards. The busbar housing top surface 211T may connect to or be combined with the busbar housing front surface 211F and the busbar housing rear surface 211R. For example, the busbar housing top surface 211T may be connected to the top edge of the busbar housing front surface 211F and the top edge of the busbar housing rear surface 211R.

[0069] The busbar housing 211 may include a lower surface 211B. The lower surface of the lower surface 211B may face downwards or be oriented downwards. The lower surface 211B may be spaced apart from the upper surface 211T of the busbar housing. The lower surface 211B may be located below the upper surface 211T of the busbar housing.

[0070] The distance between the lower surface 211B and the upper surface 211T of the busbar housing can represent the height of the busbar 210. The lower surface 211B of the busbar housing can connect to or combine with the front surface 211F and the rear surface 211R of the busbar housing. For example, the lower surface 211B of the busbar housing can be connected to the lower edge of the front surface 211F and the lower edge of the rear surface 211R of the busbar housing.

[0071] The busbar housing 211 may include a right side face 211RS. The right side face 211RS may face or be oriented to the right.

[0072] The busbar housing 211 may include a left side face 211LS. The left side face 211LS may face or be oriented to the left. The left side face 211LS may be spaced apart from the right side face 211RS in the left-right direction. The distance between the right side face 211RS and the left side face 211LS can form the thickness of the busbar assembly 211.

[0073] Reference Figure 3 , Figure 5 and Figure 6 The busbar 210 may include a nut mounting space 212. The nut mounting space 212 may be formed in the busbar housing 211. The nut mounting space 212 may be formed into a groove from the surface of the busbar housing 211. For example, the nut mounting space 212 may be formed into a groove by recessing downward from the upper surface 211T of the busbar housing.

[0074] The nut mounting space 212 can be formed into an upward-opening cavity shape. For example, the nut mounting space 212 can be connected to the upper surface 211T of the busbar housing. For example, the nut mounting space 212 can face or face upward.

[0075] The busbar 210 may include a bolt through-hole 213. The bolt through-hole 213 may be formed in the busbar housing 211. The bolt through-hole 213 may be formed through the surface of the busbar housing 211 inward.

[0076] The bolt through-hole 213 can be connected to the front surface 211F or the rear surface 211R of the busbar housing. For example, the bolt through-hole 213 can open towards the front or rear. The bolt through-hole 213 can be connected to the nut mounting space 212.

[0077] The bolt through-hole 213 can be connected to the nut mounting space 212 in a stepped manner. The nut mounting space 212 can communicate with the outside of the busbar housing 211 through the bolt through-hole 213.

[0078] Nut mounting space 212 and bolt through-hole 213 can be symmetrically formed on busbar housing 211. For example, nut mounting space 212 can be formed on both sides of the length direction of upper surface 211T of busbar housing, and bolt through-hole 213 can be formed on front surface 211F and rear surface 211R of busbar housing, respectively.

[0079] Busbar assembly 200 may include fixing module 220. Fixing module 220 may be connected to or coupled to busbar 210.

[0080] There can be multiple fixing modules 220. Multiple fixing modules 220 can be symmetrically formed on the busbar housing 211. For example, multiple fixing modules 220 can be arranged on both sides of the busbar 210 along the length direction of the busbar 210.

[0081] The fixing module 220 may include a fixing nut 221. The fixing nut 221 may be accommodated in the busbar 210. The fixing nut 221 may be accommodated in a nut mounting space 212. For example, the fixing nut 221 may enter the nut mounting space 212 from above the busbar housing 211 and be positioned in the nut mounting space 212.

[0082] The retaining nut 221 can extend from one end to the other. For example, the retaining nut 221 can extend from one end to the other along the length of the busbar 210.

[0083] The retaining nut 221 may include a retaining nut body 2211. The retaining nut body 2211 may extend from one end to the other end along the length of the busbar 210. For example, the retaining nut body 2211 may be formed in a cylindrical shape.

[0084] The fixing nut 221 may include a fixing nut outer rotating portion 2212. The fixing nut outer rotating portion 2212 can extend from one end of the fixing nut body 2211 to the other end along the length direction of the busbar 210. For example, the fixing nut outer rotating portion 2212 may be formed in a cylindrical shape.

[0085] The outer rotating portion 2212 of the fixing nut can form a step with the fixing nut body 2211. For example, the outer rotating portion 2212 of the fixing nut can be formed into a cylindrical shape with a diameter smaller than that of the fixing nut body 2211. The outer rotating portion 2212 of the fixing nut can be located at the bolt through-hole 213.

[0086] The outer rotating portion 2212 of the fixing nut may include an outer threaded portion 2212S of the fixing nut. The outer threaded portion 2212S of the fixing nut may be formed on the outer peripheral surface of the outer rotating portion 2212 of the fixing nut.

[0087] The outer rotating portion 2212 of the fixing nut can correspond to the bolt through-hole wall 213W formed in the busbar housing 211. The bolt through-hole wall 213W can face or face the bolt through-hole 213. For example, the outer threaded portion 2212S of the fixing nut formed in the outer rotating portion 2212 of the fixing nut can be engaged with the thread formed in the bolt through-hole wall 213W.

[0088] The fixing nut 221 may include a fixing nut through-hole 2213. The fixing nut through-hole 2213 may extend through the fixing nut 221. The fixing nut through-hole 2213 may extend through the center of the fixing nut body 2211 and the outer rotating part 2212 of the fixing nut. For example, the fixing nut through-hole 2213 may form the rotation center axis of the fixing nut 221.

[0089] The fixing module 220 may include a fixing bolt 222. The fixing bolt 222 may be coupled to a fixing nut 221. For example, the fixing bolt 222 may be rotatably coupled to the fixing nut 221. For example, the fixing nut 221 and the fixing bolt 222 may be formed as a ball screw structure.

[0090] The fixing bolt 222 may include a fixing bolt body 2221. The fixing bolt body 2221 may extend from one end along the length of the busbar 210 to the other end. The fixing bolt body 2221 may be exposed on the outside of the battery module 10.

[0091] The fixing bolt 222 may include a fixing bolt rotating portion 2222. The fixing bolt rotating portion 2222 may extend from one end of the fixing bolt body 2221 along the length direction of the busbar 210 to the other end. For example, the fixing bolt rotating portion 2222 may be formed in a cylindrical shape.

[0092] The rotating part 2222 of the fixing bolt can form a step with the body 2221 of the fixing bolt. For example, the rotating part 2222 of the fixing bolt can be formed into a cylindrical shape with a diameter smaller than that of the body 2221 of the fixing bolt.

[0093] The fixing bolt rotating portion 2222 can be coupled to the fixing nut 221. For example, the fixing bolt rotating portion 2222 can be rotatably coupled to the fixing nut through-hole 2213. For example, the fixing bolt thread portion 2222S formed on the outer surface of the fixing bolt rotating portion 2222 can be coupled to the fixing nut inner thread portion 2213S formed on the fixing nut through-hole 2213.

[0094] The fixing bolt 222 can rotate in place. As the fixing bolt 222 rotates, the fixing nut 221 can move along the axial direction of the fixing bolt 222. For example, the forward rotation of the fixing bolt 222 can move the fixing nut 221 forward, and the reverse rotation of the fixing bolt 222 can move the fixing nut 221 backward.

[0095] The housing 300 may include a pressurized housing 310. The pressurized housing 310 may be disposed in front of or behind the cell assembly 100 along the stacking direction of the cells 111.

[0096] The pressurized housing 310 may include a first pressurized housing 310A. The first pressurized housing 310A may form the front surface of the battery module 10. The front surface of the first pressurized housing 310A may face or be oriented forward. The first pressurized housing 310A may be disposed in close contact with the front surface of the cell assembly 100.

[0097] The pressurized housing 310 may include a second pressurized housing 310B. The second pressurized housing 310B may be spaced apart from the first pressurized housing 310A. The second pressurized housing 310B may form the rear surface of the battery module 10. The second pressurized housing 310B may be disposed in close contact with the rear surface of the cell assembly 100.

[0098] For example, the second pressurized housing 310B may be spaced apart and disposed behind the first pressurized housing 310A. The cell assembly 100 may be stacked between the first pressurized housing 310A and the second pressurized housing 310B.

[0099] The pressure housing 310 may include a pressure housing plate 311. The pressure housing plate 311 may be a plate or board shape formed on the YZ plane. For example, the pressure housing 310 may be formed into a plate shape having a thickness in the X-axis direction.

[0100] The pressure housing 310 may include a pressure housing plate hole 312. The pressure housing plate hole 312 may be formed in the pressure housing plate 311. The pressure housing plate hole 312 may be formed through the thickness direction of the pressure housing plate 311.

[0101] The fixing bolt rotating part 2222 of the fixing bolt 222 can pass through the hole 312 of the pressure housing plate. The fixing bolt rotating part 2222 can be connected to the fixing nut 221 through the bolt through hole 213.

[0102] The housing 300 may include an insertion housing 320. The insertion housing 320 may include a first insertion housing 320A. The first insertion housing 320A may form the right side of the battery module 10. The right side of the first insertion housing 320A may face or be oriented to the right.

[0103] The insertion housing 320 may include a second insertion housing 320B. The second insertion housing 320B may be spaced apart from the first insertion housing 320A. For example, the second insertion housing 320B may be spaced apart to the left of the first insertion housing 320A. The first insertion housing 320A and the second insertion housing 320B may be spaced apart along the lateral direction of the battery module 10.

[0104] The assembly process of a battery module according to an embodiment of the present disclosure will be described below.

[0105] The first pressurized housing 310A and the second pressurized housing 310B can be spaced apart along the length of the battery module 10.

[0106] Reference Figure 1 , Figures 5 to 7 The first pressure housing 310A and the second pressure housing 310B are spaced apart in the front-to-back direction, and the battery cells 111 can be stacked between the first pressure housing 310A and the second pressure housing 310B. Multiple sub-cell groups 110 and multiple pads 120 can be stacked along the length of the battery module 10.

[0107] Busbar 210 can be disposed between the first pressurized housing 310A and the second pressurized housing 310B. Additionally, busbar 210 can be spaced apart on the left and right sides of the cell assembly 100. The front and rear surfaces of busbar 210 can be spaced apart from the first pressurized housing 310A and the second pressurized housing 310B.

[0108] The fixing module 220 can connect the busbar assembly 200 and the housing 300. The fixing nut 221 can be accommodated in the nut mounting space 212 formed in the busbar 210.

[0109] Reference Figure 8 The fixing bolt 222 can be connected to the pressure housing 310 through the pressure housing plate hole 312 formed in the pressure housing plate 311. The fixing bolt 222 can be connected to the fixing nut 221.

[0110] The distance between the busbar 210 and the pressurized housing 310 can be maintained at a first distance GA. The first distance GA can represent the distance between the busbar 210 and the pressurized housing 310 before pressurizing the pad 120 forming the cell assembly 100.

[0111] The rotating part 2222 of the fixing bolt can be threaded into the fixing nut through-hole 2213 formed in the fixing nut 221. The fixing bolt body 2221 of the fixing bolt 222 is rotatably connected to the outer surface of the pressure housing plate 311.

[0112] For example, a bearing structure that can prevent friction when the fixing bolt 222 rotates can be formed between the outer surface of the fixing bolt body 2221 and the pressure housing plate 311.

[0113] Reference Figure 9 The insertion housing 320 can be disposed between the first pressurized housing 310A and the second pressurized housing 310B. Alternatively, the insertion housing 320 can be disposed on the left or right side of the busbar 210. For example, the first insertion housing 320A can be disposed close to the right side of the first busbar assembly 201, and the second insertion housing 320B can be disposed close to the left side of the second busbar assembly 202.

[0114] The distance between the insertion housing 320 and the pressurized housing 310 can maintain a second distance GB. The second distance GB can represent the distance between the insertion housing 320 and the pressurized housing 310 before pressurizing the pad 120 forming the cell assembly 100.

[0115] Reference Figure 10 Pressure can be applied to the pad 120 that forms the cell assembly 100. By rotating the fixing bolt 222, the fixing bolt rotating part 2222 can rotate in the fixing nut through-hole 2213 of the fixing nut 221.

[0116] Therefore, the fixing module 220 can perform the function of a ball screw. The busbar 210 and the pressurized housing 310 connected by the fixing module 220 can gradually move closer together.

[0117] As the fixing bolt 222 rotates, the distance between the insertion housing 320 and the pressure housing 310 can gradually decrease. For example, the distance between the insertion housing 320 and the pressure housing 310 can be kept gradually smaller than the second distance GB.

[0118] As the fixing bolt 222 continues to rotate, the insertion housing 320 and the pressure housing 310 can be brought into close contact. For example, the two ends of the insertion housing 320 and the inner surface of the pressure housing 310 can be in contact. In this case, there can be almost no clearance between the insertion housing 320 and the pressure housing 310.

[0119] In this disclosure, an adjustable-length cell assembly 100 is provided between the pressurized housings 310 provided on both sides of the battery module 10 along its length, and the distance between the pressurized housings 310 can be adjusted by the fixing module 220 forming the busbar assembly 200.

[0120] The compression of the pad 120 forming the cell assembly 100 is achieved by fixing the module 220, and the spacing between the insertion housing 320 and the pressure housing 310 disposed between the pressure housing 310 can gradually narrow. That is, during the assembly of the battery module 10, the clearance between the pressure housing 310 and the insertion housing 320 forming the housing 300 can be minimized.

[0121] Welding can be performed between the pressurized housing 310 and the insert housing 320 that form the housing 300. During welding, the weld quality can be improved by minimizing the gap between the pressurized housing 310 and the insert housing 320.

[0122] The battery module according to the embodiments of the present disclosure has been described above in the form of specific implementations, but these are only examples and the present disclosure is not limited thereto, and should be interpreted as having the broadest scope of the basic ideas disclosed in this specification.

Claims

1. A battery module, comprising: Battery cell assembly, including battery cells stacked in a front-to-back direction; Housing that houses the battery cell assembly; as well as One or more busbar assemblies are housed within the housing and connected to the housing. The housing includes a pressurized housing that faces the cell assembly in the front-rear direction. Each of the one or more busbar components includes: Busbars extend in the front-to-back direction; as well as The fixing module is fastened to the busbar and the pressurized housing, and the distance between the busbar and the pressurized housing is adjusted.

2. The battery module according to claim 1, wherein, The fixing module includes: A retaining nut is attached to the busbar; and A fixing bolt, rotatably coupled to the fixing nut. The fixing nut is in a stepped shape.

3. The battery module according to claim 2, wherein, The fixing nut includes: The main body of the fixed nut; and The outer rotating portion of the fixing nut extends from the main body of the fixing nut, and the diameter of the outer rotating portion of the fixing nut is smaller than the diameter of the main body of the fixing nut.

4. The battery module according to claim 2 or 3, wherein, The fixing bolt is engaged with the fixing nut through-hole formed along the axial direction in the fixing nut.

5. The battery module according to claim 4, wherein, The fixing bolts include: The rotating part of the fixing bolt is connected to the through-hole of the fixing nut; and The main body of the fixing bolt extends axially from the rotating portion of the fixing bolt. The fixing bolt has a stepped shape.

6. The battery module according to claim 5, wherein, The diameter of the main body of the fixing bolt is larger than the diameter of the rotating part of the fixing bolt.

7. The battery module according to any one of claims 1 to 6, wherein, The busbar includes: Busbar housing; and Nut mounting space is formed in the busbar housing. The fixing module is housed in the nut mounting space.

8. The battery module according to claim 7, wherein, The busbar further includes: Bolt through-holes are formed in the manifold housing. The bolt through-hole is connected to the nut mounting space. The fixing module passes through the bolt through-hole.

9. The battery module according to any one of claims 1 to 6, wherein, The pressurized housing includes: A first pressurized housing forms the front surface of the battery module; and The second pressurized housing forms the rear surface of the battery module.

10. The battery module according to claim 9, wherein, The first pressurized housing and the second pressurized housing each include: Pressure shell plate; and A hole is formed in the pressure housing plate. The fixing bolt passes through the hole in the pressure housing plate.

11. The battery module according to any one of claims 1 to 6, wherein, The battery cell assembly includes: Multiple sub-cell groups, wherein the sub-cell groups include the multiple cells; and A pad is disposed between the plurality of sub-cell groups.

12. The battery module according to any one of claims 1 to 6, wherein, The fixing modules are symmetrically arranged on both sides of the busbar in the front-to-back direction.

13. The battery module according to any one of claims 1 to 6, wherein, The busbar assembly includes: A first busbar assembly is disposed on one side of the cell assembly; and The second busbar assembly is located on the other side of the cell assembly.

14. A method for assembling a battery module, comprising the following steps: A battery cell assembly comprising battery cells stacked in a front-to-back direction; A pressurized housing is provided, the pressurized housing forming a housing for accommodating the battery cell assembly; A busbar assembly is provided within the housing along the front-to-back direction; as well as Using the busbar assembly, the distance between the busbar assembly and the housing can be adjusted. The busbar assembly includes: Busbars extend in the front-to-back direction; as well as The fixing module is fastened to the busbar and the pressurized housing, and the distance between the busbar and the pressurized housing is adjusted.

15. The method for assembling a battery module according to claim 14, comprising the following steps: After the busbar assembly is installed inside the housing, an insertion housing is installed, which forms a housing for accommodating the battery cell assembly. The step of adjusting the distance between the busbar assembly and the housing ends when the insertion housing and the pressurized housing come into contact.

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