Battery module and preparation method thereof

Abstract

The invention relates to the technical field of batteries, in particular to a battery module and a preparation method thereof. The battery module comprises a frame, a battery pack and two busbar sets located on the two sides of the battery pack, the battery pack comprises a plurality of battery modules, and the battery modules of the battery pack are sequentially stacked in the thickness direction of the battery pack; each busbar group comprises a plurality of busbars for electrically connecting two adjacent battery modules, and all the busbars of each busbar group are positioned on the same plane; the frame comprises two groups of first mounting assemblies, four groups of second mounting assemblies and an insulating plate group arranged between the frame and the battery pack; the two groups of first mounting assemblies are oppositely arranged along the thickness direction, are respectively positioned on two sides of the battery pack in the thickness direction and are propped against the battery pack; the four groups of second mounting assemblies are used for connecting and fixing the four end parts of the two groups of first mounting assemblies respectively, so that the two groups of first mounting assemblies tightly press the battery pack. According to the invention, dimensional tolerance of the battery module in the thickness direction can be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a battery module and a preparation method thereof. Background Art

[0002] A battery module includes a plurality of battery cells stacked together and a metal frame. During the production process of the battery module, a plurality of battery cells need to be stacked together, and then the stacked battery cells are installed in the metal frame. In this structure, due to the insufficient binding force of the metal frame on the battery cells, the metal frame cannot provide a sufficient pre-tightening force for each battery cell. Generally, the pre-tightening force of the battery cells near both sides of the metal frame is too large, and the pre-tightening force of the battery cells located at the center is insufficient. This causes some battery cells in the battery module to bulge easily during charging and discharging, resulting in a deviation between the size of adjacent battery cells and the preset size. When the cumulative size tolerance of the battery module is large, it is likely to affect the safety, stability, and service life of the entire battery module. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: aiming at the problem that the metal frame in the existing battery module has insufficient pre-tightening force on the battery cells, to provide a battery module and a preparation method thereof.

[0004] To solve the above technical problem, on the one hand, an embodiment of the present invention provides a battery module, including a frame, a battery pack, and two sets of busbar groups located on both sides of the battery pack,

[0005] The battery pack includes a plurality of battery modules, each battery module includes a metal shell and battery brackets arranged at both ends of the metal shell. Each battery module has a thickness direction, a length direction, and a width direction that are perpendicular to each other, and the plurality of battery modules of the battery pack are sequentially stacked along the thickness direction;

[0006] Each busbar group includes a plurality of busbars that electrically connect two adjacent battery modules, and all the busbars of each set of busbar groups are located on the same plane;

[0007] The frame includes two sets of first mounting components, four sets of second mounting components, and an insulating board group arranged between the frame and the battery pack;

[0008] The two sets of first mounting components are arranged opposite to each other along the thickness direction, and are respectively located on both sides of the thickness direction of the battery pack and abut against the battery pack;

[0009] The four sets of second mounting components respectively connect and fix the four ends of the two sets of first mounting components, so that the two sets of first mounting components compress the battery pack.

[0010] Optionally, the number of the battery modules in the battery pack is 3 - 25. Of course, other numbers of battery modules are also within the protection scope of this embodiment. According to tests, the number of 3 - 25 battery modules is the preferred solution of this embodiment. When the number of battery modules is too large, the pre-tightening force of the first mounting assembly and the second mounting assembly on the battery modules cannot achieve the required effect. That is, the battery module in the middle may bulge in its thickness direction, which may affect the dimensional tolerance, safety and stability of the battery pack.

[0011] Optionally, the first mounting assembly is an end plate, and the end plate includes a rectangular vertical plate. Avoidance grooves are provided on both sides of the rectangular vertical plate in the length direction of the battery module. Fixing members for fixedly connecting with the second mounting assembly are respectively provided at the four end portions of the rectangular vertical plate. In this embodiment, compared with the traditional integral sealed frame, the pre-tightening force on the battery pack is applied by two groups of end plates in this embodiment, which can reduce the weight of the battery module group. The setting of the avoidance grooves can facilitate some components installed on the busbar or the battery pack to protrude, and then can facilitate the connection of these components with other external structures. At the same time, in this embodiment, fixing members are only provided at the four end portions corresponding to the second mounting assembly, which can reduce the occupied area of the fixing members. In addition, the end plate is preferably made of high-strength steel, and the thickness of the end plate is 0.9 mm - 1.5 mm. In this embodiment, the thickness of the end plate is preferably 1.2 mm. At the same time, the end plate can bear a force of more than 9000 N.

[0012] Optionally, the end plate further includes two bending strips for restricting the relative position of the end plate and the battery pack in the width direction. The bending strips are bent from the end plate towards the side of the battery pack. The two bending strips are respectively located on both sides of the battery module in the width direction, and weight-reducing holes are provided on the bending strips. In this embodiment, part of the insulating plate group is arranged between the bending strips and the battery cell group. The setting of the bending strips can facilitate the fixing of the insulating plate group by the frame, and then can ensure the insulation effect between the frame and the battery pack.

[0013] Optionally, the second mounting assembly is an L-shaped angle bracket, which includes a connecting body having a first abutting surface and a second abutting surface arranged perpendicular to each other. The first abutting surfaces of two adjacent L-shaped angle brackets are arranged opposite to each other in the width direction of the battery module to limit the relative position of the battery pack in the width direction, and the second abutting surfaces of two adjacent L-shaped angle brackets are arranged opposite to each other in the length direction of the battery module to limit the relative position of the battery pack in the length direction. In this embodiment, the setting of the first abutting surface can prevent the battery module from jumping in its width direction, and the setting of the second abutting surface can prevent the battery module from jumping in its length direction, thereby ensuring the stability of the battery pack. At the same time, the L-shaped angle bracket is provided with a through hole for weight reduction. In addition, an opening groove is provided on the L-shaped angle bracket for the jig to be inserted into the positioning groove of the battery bracket of the battery module.

[0014] Optionally, the second mounting assembly further includes fixed ends arranged on both sides of the connecting body. The fixed ends are arranged perpendicular to the connecting body, and the two fixed ends respectively extend to the outer side surface of the end plate and are fixedly connected to the end plate through the fixing members. In this embodiment, one end of the fixed end far from the connecting body has an opening, which is convenient for the connection of the fixing members on the first mounting assembly and the second mounting assembly.

[0015] Optionally, the battery module further includes at least one binding member for defining the distance between the two first mounting assemblies and a backing plate arranged between the binding member and the battery pack. The binding member surrounds the outer peripheral surfaces of the battery pack and the first mounting assembly. In this embodiment, the thickness of the backing plate is preferably equal to the thickness of the end plate, and the backing plate can play a role in compensating the thickness, so that the binding member can bind the end plate and the battery module more tightly. The binding member is preferably a steel tie strap, and through the binding of the tie strap, the pre-tightening force of the two first mounting assemblies on the battery module therebetween can be further ensured.

[0016] Optionally, the insulating plate group includes a first insulating plate arranged between the first mounting assembly and the battery pack. A plurality of first through holes are arranged on the first insulating plate in a matrix arrangement. The first through holes can play a role in weight reduction.

[0017] Optionally, the insulating plate group further includes a second insulating plate arranged between adjacent second mounting assemblies. A plurality of second through holes are arranged on the second insulating plate in a matrix arrangement. The second through holes can play a role in weight reduction.

[0018] Optionally, a hook is provided on the side of the end plate away from the battery module. This is convenient for the staff to carry the battery module.

[0019] Optionally, the battery pack further includes a plurality of adhesive layers disposed between two adjacent battery modules. In this embodiment, adjacent battery modules are connected together by adhesive force, so that a plurality of battery modules form an integral body. When handling the battery module, the adhesion force of the double-sided adhesive layer enables stable contact and no dislocation between adjacent battery modules, so that the frame can continuously apply a pre-tightening force to the battery cell group.

[0020] In this embodiment, in the length direction of the battery module, grooves for positioning are provided on the sides of the two battery brackets. Workers can use a jig to insert into the grooves so that all the battery brackets are located on the same plane. Then, the bus bar is supported by the battery brackets, so that when the welding jaw presses the bus bar against the battery bracket during welding, it can be ensured that all the bus bars are located on the same plane during welding.

[0021] For the battery module according to this embodiment, in the thickness direction of the battery module, two groups of first mounting components are respectively abutted against the first battery module and the last battery module. At the same time, four groups of second mountings are respectively fixedly connected to the four ends of the first mounting component and the second mounting component, so that the first mounting component and the second mounting component can continuously apply a pre-tightening force to the battery module in the thickness direction of the battery module. When the battery module is charged, under the restraint of the pre-tightening force of the first mounting component and the second mounting component, it is possible to avoid the battery module bulging in its thickness direction, and further avoid the dimensional tolerance of the battery module in its thickness direction, thereby ensuring the safety and stability of the battery module. At the same time, through the bus bar, partial series connection, partial parallel connection, all series connection or all parallel connection can be realized between multiple battery modules, so that multiple battery modules form an integral body, improving the application space of the battery module. By providing the insulating plate group, it is possible to avoid short circuits between the first mounting component and the second mounting component and the battery pack, thereby ensuring the stability of the battery pack performance.

[0022] On the other hand, an embodiment of the present invention provides a method for manufacturing a battery module, including the following steps: Stacking step: Stacking N battery modules along the thickness direction of the battery module in sequence to form a battery pack;

[0023] Frame mounting step: Placing two groups of the first mounting components on both sides of all the battery modules in the thickness direction, pushing the two groups of the first mounting components to move towards each other, so that the two groups of the first mounting components press the battery modules therebetween, and then fixedly connecting four groups of the second mounting components to the two groups of the first mounting components, and using the two groups of the second mounting components to fix the two groups of the first mounting components;

[0024] Bus bar alignment step: Install the two groups of the bus bar groups on the outer sides of the battery brackets of the battery pack respectively, electrically connect the multiple battery modules in the battery pack by using the two groups of the bus bar groups, and fix the battery brackets of the battery modules on the same side of all the battery packs on the same horizontal plane by using a jig, so as to define that all the bus bars of each group are installed on the same plane;

[0025] Welding step: Weld the bus bar and the ear of the corresponding battery module together by using a welding device.

[0026] It further includes a step of installing an insulating plate group before the step of installing the frame, and placing the insulating plate groups on the outer sides of the battery packs respectively.

[0027] It further includes a step of installing a binding member before the bus bar alignment step.

[0028] According to the preparation method of the battery module of this embodiment, the battery module between two first installation components is clamped by the two first installation components moving towards each other, and the two groups of first installation components are fixedly connected by four groups of second installation components, so that the battery module can be subjected to uniform and continuous pre-tightening force during the whole charge and discharge process of the battery cell group. Furthermore, it can avoid the battery module bulging during use, and ensure the safety and stability of the battery module during use. Description of the Drawings

[0029] Figure 1 is a schematic diagram of the overall structure of the battery module provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the structure of the battery module provided by an embodiment of the present invention after removing part of the structure;

[0031] Figure 3 is a schematic diagram of the structure of the end plate in the battery module provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of the structure of the L-shaped angle bracket in the battery module provided by an embodiment of the present invention;

[0033] Figure 5 is an exploded view of the battery module provided by an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of the structure of the frame in the battery module provided by an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of the structure of the battery module in the battery module provided by an embodiment of the present invention;

[0036] Figure 8It is a flowchart of a method for preparing a battery module provided by an embodiment of the present invention.

[0037] The reference numerals in the specification are as follows:

[0038] 1. Frame; 2. Battery module; 3. Bus bar; 4. Binding member; 5. Backing plate; 6. Tab; 7. Insulating plate group; 11. First mounting assembly; 12. L-shaped corner bracket; 21. Metal housing; 22. Battery bracket; 71. First insulating plate; 72. Second insulating plate; 111. End plate; 113. Weight reduction hole; 121. Connection body; 122. Fixed end; 1111. Rectangular vertical plate; 1112. Bending strip; 1113. Avoidance groove; 1114. Fixing member; 221. Groove. Detailed implementation manners

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] As Figures 1 to 7 shown, an embodiment of the present invention provides a battery module, including a frame 1, a battery pack and two sets of bus bar groups 3 located on both sides of the battery pack.

[0041] The battery pack includes a plurality of battery modules 2. Each battery module 2 includes a metal housing 21 and battery brackets 22 arranged at both ends of the metal housing 21. The battery modules 2 of the battery pack are stacked in sequence along the thickness direction. Each battery module 2 has mutually perpendicular thickness direction, length direction and width direction.

[0042] The bus bar groups 3 include a plurality of bus bars 3 that electrically connect two adjacent battery modules 2. All the bus bars 3 of each bus bar group 3 are located on the same plane.

[0043] The frame 1 includes two sets of first mounting assemblies 11, four sets of second mounting assemblies and an insulating plate group 7 arranged between the frame 1 and the battery pack.

[0044] The two sets of first mounting assemblies 11 are arranged opposite to each other along the thickness direction, and are respectively located on both sides of the battery pack in the thickness direction and are in contact with the battery pack.

[0045] The four sets of second mounting assemblies respectively connect and fix the four ends of the two sets of first mounting assemblies 11, so that the two sets of first mounting assemblies 11 compress the battery pack.

[0046] In one embodiment, the number of battery modules 2 in the battery pack is 3 - 25. Of course, other numbers of battery modules 2 are also within the protection scope of this embodiment. According to the test, the number of battery modules 2 being 3 - 25 is the preferred solution of this embodiment. When the number of battery modules 2 is too large, the pre-tightening force of the first mounting assembly 11 and the second mounting assembly on the battery module 2 cannot achieve the required effect. That is, the battery module 2 in the middle may bulge in its thickness direction, which may in turn affect the dimensional tolerance, safety and stability of the battery pack.

[0047] In one embodiment, the first mounting assembly 11 is an end plate 111. The end plate 111 includes a rectangular vertical plate 1111. Avoidance grooves 1113 are provided on both sides of the rectangular vertical plate 1111 in the length direction of the battery module 2. Fixing members 1114 for fixedly connecting with the second mounting assembly are respectively provided at the four ends of the rectangular vertical plate 1111. In this embodiment, compared with the traditional integral sealed frame, in this embodiment, the pre-tightening force is applied to the battery pack through two groups of end plates 111, which can reduce the weight of the battery module. The setting of the avoidance grooves 1113 can facilitate some components installed on the busbar 3 or the battery pack to protrude, and further facilitate the connection of these components with other external structures. At the same time, in this embodiment, fixing members 1114 are only provided at the four ends corresponding to the second mounting assembly, which can reduce the occupied area of the fixing members 1114. In addition, the end plate 111 is preferably made of high-strength steel, and the thickness of the end plate 111 is 0.9 mm - 1.5 mm. In this embodiment, the thickness of the end plate 111 is preferably 1.2 mm. At the same time, the end plate 111 can bear a force of more than 9000 N.

[0048] In one embodiment, the end plate 111 further includes two bending strips 1112 for restricting the relative position of the end plate 111 and the battery pack in the width direction. The bending strips 1112 are bent from the end plate 111 towards the side of the battery pack. The two bending strips 1112 are respectively located on both sides of the battery module 2 in the width direction, and weight reduction holes 113 are provided on the bending strips 1112. In this embodiment, part of the insulating plate group 7 is arranged between the bending strip 1112 and the battery cell group. The setting of the bending strip 1112 can facilitate the fixing of the insulating plate group 7 by the frame 1, and further ensure the insulation effect between the frame 1 and the battery pack.

[0049] In one embodiment, the second mounting component is an L-shaped angle bracket 12. The L-shaped angle bracket 12 includes a connecting body 121. The connecting body 121 has a first abutting surface and a second abutting surface that are perpendicularly arranged. The first abutting surfaces of two adjacent L-shaped angle brackets 12 are arranged opposite to each other in the width direction of the battery module to limit the relative position of the battery pack in the width direction. The second abutting surfaces of two adjacent L-shaped angle brackets 12 are arranged opposite to each other in the length direction of the battery module to limit the relative position of the battery pack in the length direction. In this embodiment, the arrangement of the first abutting surface can prevent the battery module 2 from jumping in its width direction, and the arrangement of the second abutting surface can prevent the battery module 2 from jumping in its length direction, thereby ensuring the stability of the battery pack. At the same time, through holes for weight reduction are provided on the L-shaped angle bracket 12. In addition, an opening groove is provided on the L-shaped angle bracket 12 for the positioning of the jig inserted into the groove 221 of the battery bracket 22 of the battery module 2.

[0050] In one embodiment, the second mounting component further includes fixed ends 122 arranged on both sides of the connecting body 121. The fixed ends 122 are perpendicularly arranged with the connecting body 121. The two fixed ends 122 respectively extend to the outer side surface of the end plate 111 and are fixedly connected to the end plate 111 through fixing members 1114. In this embodiment, one end of the fixed end 122 far from the connecting body 121 has an opening, which is convenient for the connection between the first mounting component 11 and the fixing member 1114 on the second mounting component.

[0051] In one embodiment, the battery module further includes at least one bundling member 4 for defining the distance between two first mounting components 11 and a spacer 5 arranged between the bundling member 4 and the battery pack. The bundling member 4 surrounds the outer peripheral surfaces of the battery pack and the first mounting component 11. In this embodiment, the thickness of the spacer 5 is preferably equal to the thickness of the end plate 111. The spacer 5 can play a role in compensating the thickness, so that the bundling member 4 can bundle the end plate 111 and the battery module 2 more tightly. The bundling member 4 is preferably a steel tie strap. Through the bundling of the tie strap, the pre-tightening force of the two first mounting components 11 on the battery module 2 therebetween can be further ensured.

[0052] In one embodiment, the insulating plate group 7 includes a first insulating plate 71 arranged between the first mounting component 11 and the battery pack. A plurality of first through holes arranged in a matrix are provided on the first insulating plate 71. The first through holes can play a role in weight reduction.

[0053] In one embodiment, the insulating plate group 7 further includes a second insulating plate 72 arranged between adjacent second mounting components. A plurality of second through holes arranged in a matrix are provided on the second insulating plate 72. The second through holes can play a role in weight reduction.

[0054] In one embodiment, a hook is provided on the side of the end plate 111 away from the battery module 2. This facilitates the handling of the battery module by the staff.

[0055] In one embodiment, the battery pack further includes a plurality of adhesive layers disposed between two adjacent battery modules 2. In this embodiment, the adjacent battery modules 2 are connected together by the adhesive force. To form an integral body of multiple battery modules, when handling the battery module, the adhesion of the double-sided adhesive layer enables stable contact and no misalignment between adjacent battery modules 2, and further enables the frame 1 to continuously apply a pre-tightening force to the battery cell group. In this embodiment, in the length direction of the battery module 2, positioning grooves 221 are provided on the sides of the two battery brackets 22. The staff can use a jig to insert into the grooves 221 so that all the battery brackets 22 are located on the same plane. Then, the busbar 3 is supported by the battery brackets 22, so that when the welding jaws press the busbar 3 against the battery brackets 22 during welding, it can be ensured that all the busbars 3 are located on the same plane during welding.

[0056] For the battery module according to this embodiment, in the thickness direction of the battery module 2, two sets of first mounting components 11 are respectively abutted against the first battery module 2 and the last battery module 2. At the same time, four sets of second mountings are fixedly connected to the four ends of the first mounting component 11 and the second mounting component, so that the first mounting component 11 and the second mounting component can continuously apply a pre-tightening force to the battery module 2 in the thickness direction of the battery module 2. When the battery module is charged, under the restraint of the pre-tightening force of the first mounting component 11 and the second mounting component, it is possible to prevent the battery module 2 from bulging in its thickness direction, and further prevent the battery module from having dimensional tolerances in its thickness direction, thereby ensuring the safety and stability of the battery module. At the same time, through the busbar 3, partial series connection, partial parallel connection, all series connection or all parallel connection can be realized between multiple battery modules 2, so that multiple battery modules 2 form an integral body, improving the application space of the battery module 2. By providing the insulating plate group 7, it is possible to prevent the first mounting component 11 and the second mounting component from short-circuiting with the battery pack, and further ensure the stability of the battery pack performance.

[0057] In one embodiment, as Figure 8 shown, the embodiment of the present invention provides a method for preparing a battery module, including the following steps: Stacking step: Stacking N battery modules 2 in sequence along the thickness direction of the battery module 2 to form a battery pack;

[0058] Steps for installing the frame 1: Place two sets of first mounting components 11 on both sides of all battery modules 2 in the thickness direction, push the two sets of first mounting components 11 to move towards each other, so that the two sets of first mounting components 11 clamp the battery modules 2 therebetween, then fixedly connect four sets of second mounting components to the two sets of first mounting components 11, and use the two sets of second mounting components to fix the two sets of first mounting components 11;

[0059] Steps for aligning the busbars 3: Install two sets of busbars 3 on the outer sides of the battery brackets 22 of the battery pack respectively, use the two sets of busbars 3 to electrically connect multiple battery modules 2 in the battery pack together, and use a jig to fix the battery brackets 22 of the battery modules 2 on the same side of all battery packs on the same horizontal plane, so as to define that all busbars 3 in each set are installed on the same plane;

[0060] Welding steps: Weld the busbars 3 to the lugs 6 of the corresponding battery modules 2 through a welding device.

[0061] It further includes a step of installing the insulating plate group 7 before the step of installing the frame 1, and placing the insulating plate group 7 on the outer sides of the battery packs respectively.

[0062] It further includes a step of installing the binding member 4 before the step of aligning the busbars 3.

[0063] According to the preparation method of the battery module of this embodiment, the battery modules 2 therebetween are clamped by two first mounting components 11 moving towards each other, and the two sets of first mounting components 11 are fixedly connected by four sets of second mounting components, so that the battery modules 2 can receive uniform and continuous pre-tightening force during the entire charging and discharging process of the battery cell group. Furthermore, it can avoid the battery modules 2 from bulging during use, ensuring the safety and stability of the battery module during use.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery module, characterized in that, It includes a frame, a battery pack, and two sets of busbar groups located on both sides of the battery pack. The battery pack includes a plurality of battery modules. Each battery module includes a metal housing and battery brackets provided at both ends of the metal housing. Each battery module has a thickness direction, a length direction, and a width direction that are perpendicular to each other. The plurality of battery modules of the battery pack are stacked in sequence along the thickness direction. Each busbar group includes a plurality of busbars that electrically connect two adjacent battery modules. All the busbars of each busbar group are located on the same plane. The frame includes two sets of first mounting components, four sets of second mounting components, and an insulating plate group provided between the frame and the battery pack. The two sets of first mounting components are arranged opposite to each other along the thickness direction, and are respectively located on both sides of the battery pack in the thickness direction and are in contact with the battery pack. The four sets of second mounting components respectively connect and fix the four ends of the two sets of first mounting components, so that the two sets of first mounting components compress the battery pack.

2. The battery module according to claim 1, characterized in that, The number of battery modules in the battery pack is 3 - 25.

3. The battery module according to claim 1, characterized in that, The first mounting component is an end plate. The end plate includes a rectangular vertical plate. Avoidance grooves are provided on both sides of the rectangular vertical plate in the length direction of the battery module. Fixing members for fixedly connecting with the second mounting component are respectively provided at the four ends of the rectangular vertical plate.

4. The battery module according to claim 3, characterized in that, The end plate further includes two bending strips for restricting the relative position of the end plate and the battery pack in the width direction. The bending strips are bent from the side of the end plate towards the battery pack. The two bending strips are respectively located on both sides of the battery module in the width direction, and weight - reducing holes are provided on the bending strips.

5. The battery module according to claim 3, characterized in that, The second mounting component is an L - shaped angle bracket. The L - shaped angle bracket includes a connecting body. The connecting body has a first abutting surface and a second abutting surface that are perpendicular to each other. The first abutting surfaces of two adjacent L - shaped angle brackets are arranged opposite to each other in the width direction of the battery module to restrict the relative position of the battery pack in the width direction. The second abutting surfaces of two adjacent L - shaped angle brackets are arranged opposite to each other in the length direction of the battery module to restrict the relative position of the battery pack in the length direction.

6. The battery module according to claim 5, characterized in that, The second mounting component further includes fixing ends provided on both sides of the connecting body. The fixing ends are perpendicular to the connecting body. The two fixing ends respectively extend to the outer side surfaces of the end plates and are fixedly connected to the end plates through the fixing members.

7. The battery module according to claim 1, characterized in that, The battery module further includes at least one binding member for defining the distance between the two first mounting components and a cushion plate provided between the binding member and the battery pack. The binding member surrounds the outer peripheral surfaces of the battery pack and the first mounting components.

8. The battery module according to claim 1, characterized in that, The insulating plate group includes a first insulating plate provided between the first mounting component and the battery pack. A plurality of first through - holes arranged in a matrix are provided on the first insulating plate.

9. The battery module according to claim 8, characterized in that, The insulating plate group further includes a second insulating plate provided between adjacent second mounting components. A plurality of second through - holes arranged in a matrix are provided on the second insulating plate.

10. A method for preparing a battery module according to any one of claims 1-9, characterized in that, It includes the following steps: Stacking step: Stack N of the battery modules in sequence along the thickness direction of the battery module to form a battery pack; Frame installation step: Place two sets of the first mounting components on both sides of all the battery modules in the thickness direction of the battery modules respectively, push the two sets of the first mounting components to move towards each other, so that the two sets of the first mounting components compress the battery modules therebetween, then fixedly connect four sets of the second mounting components to the two sets of the first mounting components, and use the two sets of the second mounting components to fix the two sets of the first mounting components; Busbar alignment step: Install two sets of the busbar groups on the outer sides of the battery brackets of the battery pack respectively, use the two sets of the busbar groups to electrically connect multiple battery modules in the battery pack together, and use a jig to fix the battery brackets of all the battery modules on the same side of all the battery packs on the same horizontal plane, so as to define that all the busbars in each group are installed on the same plane; Welding step: Weld the busbar to the ear of the corresponding battery module through a welding device.

Images