Assembling method of battery module and battery module

Abstract

The invention relates to an assembly method of a battery module and the battery module, and relates to the technical field of batteries. According to the battery module, the first cross beam is fixed in the box body, then the battery monomers and the cushion pads are stacked on one side of the first cross beam to form the battery units, then the second cross beam is arranged on one side, far away from the first cross beam, of each battery unit, and finally the pre-tightening force is applied to the second cross beam to counteract the pressure generated by the expansion of the battery monomers to the battery module; the deformation of the battery module is prevented; and the stability of the battery monomers in the cyclic charging and discharging process is ensured. Moreover, the second cross beam is fixed, so that the single batteries and the buffer pad are tightly clamped between the first cross beam and the second cross beam, the single batteries, the buffer pad, the first cross beam and the second cross beam are not easy to misplace, and the battery module is convenient to transfer and transport; and the possibility of failure of the battery module caused by shaking of the battery monomers under complex road conditions is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an assembly method for a battery module and a battery module. Background Technology

[0002] When electric vehicles are in motion, the battery pack often vibrates, and sometimes it may even be subjected to severe impacts. In order to prevent individual battery cells from coming off the battery module, end plates and side plates are used to apply a certain preload to the individual battery cells when multiple individual battery cells are combined into a battery module. This reduces the risk of individual battery cells coming off the battery module under severe conditions such as vibration or impact, thereby reducing the risk of short circuits.

[0003] In the production process of battery modules, the assembly and fixing of individual battery cells is a critical step. Traditional battery module assembly methods often employ simple stacking and fixing, which can easily lead to unstable connections between battery cells and make it difficult to guarantee the safety and stability of the battery module during long-term use. Especially under vibration or shock environments, gaps between battery cells can cause loosening of the module structure and performance degradation. Therefore, a more efficient battery module assembly method is needed to improve the structural stability and lifespan of battery modules. Summary of the Invention

[0004] This application provides a battery module pre-tightening assembly method and a battery module, which aims to improve the connection stability between battery cells and the overall structural strength of the battery module by applying pre-tightening force.

[0005] To achieve the above objectives, according to a first aspect of this application, a method for assembling a battery module is provided, comprising:

[0006] Fix the first crossbeam inside the box;

[0007] Multiple battery cells and multiple buffer pads are stacked inside the box on one side of the first crossbeam, with a buffer pad placed between two adjacent battery cells.

[0008] The second crossbeam is installed inside the housing, and the second crossbeam is located on the side of the battery cell away from the first crossbeam.

[0009] A preload is applied to the second crossbeam to compress the battery cells and buffer pads located between the first and second crossbeams, thereby fixing the second crossbeam into the housing.

[0010] In some embodiments, the step of fixing the first crossbeam to the box body includes:

[0011] In the height direction of the box, the first crossbeam is fixedly connected to the bottom of the box by the first fastener;

[0012] The first connector is disposed between the housing and the battery cell, and the first connector is disposed on at least one side of the first crossbeam in the length direction of the housing;

[0013] Along the length of the box body, the first crossbeam and the first connecting member are fixedly connected by the second fastener.

[0014] In some embodiments, the step of applying a preload to the second crossbeam includes:

[0015] The second connector is positioned between the housing and the battery cell, and the second connector is positioned on the side of the second crossbeam facing the first crossbeam;

[0016] Along the length of the box body, the second crossbeam and the second connecting piece are fixedly connected by a third fastener;

[0017] In the height direction of the box, the second crossbeam is fixedly connected to the bottom of the box by the fourth fastener.

[0018] In some embodiments, the step of placing the battery cell and the buffer pad inside the housing on one side of the first crossbeam further includes:

[0019] Along the length of the housing, the first epoxy board is positioned between the first crossbeam and the battery cell;

[0020] The step of installing the second crossbeam inside the box also includes:

[0021] Along the length of the housing, a second epoxy plate is placed between the second crossbeam and the battery cell.

[0022] In some embodiments, the battery module assembly method further includes:

[0023] The pressure strip is placed on the battery cell, and the pressure strip extends along the width of the casing and covers the gap between two adjacent battery cells.

[0024] In the height direction of the box body, the pressure strip and the first crossbeam are fixedly connected by the fifth fastener, and the pressure strip and the second crossbeam are fixedly connected by the sixth fastener.

[0025] In some embodiments, after the step of fixing the first crossbeam to the box body, the method further includes:

[0026] A battery cell and a buffer pad are set on the other side of the first crossbeam, and a buffer pad is set between two adjacent battery cells;

[0027] The third crossbeam is placed inside the housing, and the third crossbeam is placed on the side of the battery cell away from the first crossbeam.

[0028] A preload is applied to the third crossbeam to compress the battery cells and buffer pads located between the first and third crossbeams, thereby fixing the third crossbeam into the housing.

[0029] According to a second aspect of this application, a battery module is provided, comprising:

[0030] Box;

[0031] The first crossbeam is fixed inside the box.

[0032] The second crossbeam is fixed inside the box and is spaced apart from the first crossbeam along the length of the box.

[0033] The battery cell and the buffer pad are disposed between the first crossbeam and the second crossbeam, and the battery cell and the buffer pad are squeezed by the first crossbeam and the second crossbeam. A buffer pad is disposed between two adjacent battery cells.

[0034] In some embodiments, the battery module further includes:

[0035] The first fastener is used to fix the first crossbeam to the bottom of the box body in the height direction of the box body;

[0036] The first connector is disposed between the housing and the battery cell, and the first connector is disposed on at least one side of the first crossbeam in the length direction of the housing;

[0037] The second fastener is used to fix the first crossbeam and the first connector along the length of the box.

[0038] In some embodiments, the battery module further includes: a second connector disposed between the housing and the battery cell, and the second connector is disposed on the side of the second crossbeam facing the first crossbeam;

[0039] The third fastener is used to fix the second crossbeam and the second connector along the length of the box body.

[0040] The fourth fastener is used to fix the second crossbeam to the bottom of the box in the height direction of the box.

[0041] In some embodiments, the battery module further includes: a first epoxy board disposed between the first crossbeam and the battery cell in the longitudinal direction of the housing;

[0042] The second epoxy board is positioned between the second crossbeam and the battery cell along the length of the housing.

[0043] The technical advantage of this application lies in providing a battery module assembly method and a battery module. First, a first crossbeam is fixed inside a housing. Then, battery cells and buffer pads are stacked on one side of the first crossbeam to form a battery unit. Next, a second crossbeam is positioned on the side of the battery unit away from the first crossbeam. Finally, a preload is applied to the second crossbeam to counteract the pressure exerted on the battery module by the expansion of the battery cells, preventing deformation of the battery module and ensuring the stability of the battery cells during cyclic charging and discharging. Furthermore, a third fastener securely connects the second crossbeam and the second connecting member along the length, and a fourth fastener securely connects the second crossbeam to the bottom of the housing. This allows the battery cells and buffer pads to be tightly clamped between the first and second crossbeams, ensuring that the battery cells, buffer pads, first crossbeam, and second crossbeam are not prone to misalignment. This facilitates the transfer and transportation of the battery module and reduces the possibility of battery module failure due to battery cell shaking under complex road conditions.

[0044] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0047] Figure 1 This is a flowchart of the assembly method of the battery module provided in the application embodiment.

[0048] Figure 2 This is a schematic diagram of the battery module provided in the application embodiment.

[0049] Figure 3 This is a flowchart illustrating the fixing of the first crossbeam within the box body according to an embodiment of this application.

[0050] Figure 4 This is another structural schematic diagram of the battery module provided in the application embodiment.

[0051] Figure 5 yes Figure 4 An enlarged schematic diagram of part A in the middle.

[0052] Figure 6 This is a flowchart of applying preload to the second crossbeam according to an embodiment of this application.

[0053] Figure 7 yes Figure 4 Enlarged schematic diagram of part B.

[0054] Figure 8 This is a flowchart showing the first crossbeam being fixed inside the box according to the application embodiment.

[0055] Figure 9 This is a flowchart of applying preload to the third crossbeam according to an embodiment of this application.

[0056] Figure 10 yes Figure 4 An enlarged schematic diagram of section C.

[0057] Explanation of reference numerals in the attached figures:

[0058] 11-Box body; 12-First crossbeam; 13-Second crossbeam; 14-Battery cell; 15-Buffer pad; 16-Battery unit; 17-First connector; 18-Second connector; 19-First fastener; 20-Second fastener; 21-Third fastener; 22-Fourth fastener; 23-First epoxy board; 24-Second epoxy board; 25-Pressure strip; 26-Fifth fastener; 27-Sixth fastener; 28-Busbar; 29-Third crossbeam; 30-Third connector; 31-Seventh fastener; 32-Eighth fastener. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0060] In related technologies, there are roughly the following schemes for applying pre-tightening force to the battery cells in the battery module: First, end plates and steel cable ties are designed on both sides of the battery module to provide pre-tightening force, which needs to be placed into the battery pack box after assembly outside the battery pack box; Second, the battery module needs to use equipment to squeeze the size of the battery cells and then put them into the battery pack box by a robot arm. This design structure is complex and the assembly process is difficult.

[0061] In view of this, embodiments of this application provide a battery module pre-tightening assembly method and a battery module. By applying pre-tightening force, the battery cells and buffer pads are tightly pressed between the first and second crossbeams, thereby improving the connection stability between battery cells and the overall structural strength of the battery module. This assembly method is simple, efficient, and suitable for large-scale industrial production.

[0062] Please see Figure 1 and Figure 2 This application provides a battery module assembly method, including:

[0063] S1. Fix the first crossbeam 12 inside the box 11. (See below) Figure 1 and Figure 2 .

[0064] Specifically, please refer to Figure 3 , Figure 4 and Figure 5 Step S1 specifically includes the following steps:

[0065] S11. The first crossbeam 12 is fixedly connected to the bottom of the box 11 via the first fastener 19 in the height direction of the box 11.

[0066] S12. The first connector 17 is disposed between the housing 11 and the battery cell 14, and the first connector 17 is disposed on at least one side of the first crossbeam 12 in the length direction of the housing 11.

[0067] S13. The first crossbeam 12 and the first connecting member 17 are fixedly connected by the second fastener 20 along the length of the box body 11.

[0068] Therefore, in step S1, the first crossbeam 12 is first fixedly connected to the bottom of the housing 11 by the first fastener 19, ensuring a stable connection between the first crossbeam 12 and the housing 11 in the height direction and reducing loosening or displacement caused by vibration or external force. Then, a first connector 17 is provided between the housing 11 and the battery cell 14, and the first connector 17 is connected to at least one of the bottom or side wall of the housing 11. This helps to disperse and absorb external impact forces, protecting the battery cell 14 from damage. Finally, the first crossbeam 12 and the first connector 17 are fixedly connected by the second fastener 20, thereby ensuring a stable connection between the first crossbeam 12, the first connector 17, and the housing 11 in the length direction and reducing loosening or displacement caused by vibration or external force.

[0069] S2. Multiple battery cells 14 and multiple buffer pads 15 are stacked inside the housing 11 on one side of the first crossbeam 12, with a buffer pad 15 placed between two adjacent battery cells 14. (See below) Figure 1 and Figure 2 .

[0070] During the stacking process, the mixed adhesive is first applied evenly to the bottom of the housing 11 using a brush, dropper, or other tool. Then, the battery cells 14 and buffer pads 15 are stacked sequentially inside the housing 11 to form battery units 16 extending along the length direction. Multiple rows of battery units 16 can be arranged inside the housing 11, for example... Figure 2The diagram shows four rows of battery cells 16.

[0071] A buffer pad 15 is a type of material used to absorb impact or reduce vibration. It is usually a soft, elastic material, such as foam or other elastomers. The buffer pad 15 is used to protect the battery cell 14 from physical damage, especially during transportation or installation. The buffer pad 15 can absorb external impact forces and reduce the impact of vibration on the battery, thereby improving the reliability and durability of the entire battery module.

[0072] S3. The second crossbeam 13 is installed inside the housing 11, and the second crossbeam 13 is located on the side of the battery cell 14 away from the first crossbeam 12. See [reference needed]. Figure 1 and Figure 2 .

[0073] S4. Apply a preload to the second crossbeam 13 to compress the battery cell 14 and buffer pad 15 located between the first crossbeam 12 and the second crossbeam 13, thereby fixing the second crossbeam 13 within the housing 11. (See below) Figure 1 and Figure 2 .

[0074] Please see Figure 6 and Figure 7 Step S4 specifically includes the following steps:

[0075] S41. The second connector 18 is disposed between the housing 11 and the battery cell 14, and the second connector 18 is disposed on the side of the second crossbeam 13 facing the first crossbeam 12.

[0076] S42. The second crossbeam 13 and the second connecting member 18 are fixedly connected in the length direction of the box body 11 by the third fastener 21;

[0077] S43. The second crossbeam 13 is fixedly connected to the bottom of the box 11 by the fourth fastener 22 in the height direction of the box 11.

[0078] In step S4, since the first crossbeam 12 is fixed to the bottom of the housing 11 before the second crossbeam 13, after applying a preload to the second crossbeam 13, the second connector 18 is placed on the side of the second crossbeam 13 facing the first crossbeam 12. Then, the second crossbeam 13 and the second connector 18 are fixedly connected in the length direction by the third fastener 21, and the second crossbeam 13 is fixedly connected to the housing 11 by the fourth fastener 22. This allows the battery cell 14 and the buffer pad 15 to be sandwiched between the first crossbeam 12 and the second crossbeam 13, ensuring that the battery cell 14, the buffer pad 15, the first crossbeam 12 and the second crossbeam 13 are not prone to misalignment, facilitating the transfer and transportation of the battery module, and reducing the possibility of the battery module failing due to shaking of the battery cell 14 under complex road conditions.

[0079] In this embodiment, a preload is applied to the second crossbeam 13, so that the preload acts on the battery module to counteract the pressure generated by the expansion of the battery cell 14 on the battery module, prevent the battery module from deforming, and ensure that the battery cell 14 remains stable during cyclic charging and discharging.

[0080] In some embodiments, please refer to Figure 1 and Figure 2 Step S2 further includes: placing the first epoxy board 23 between the first crossbeam 12 and the battery cell 14 along the length of the housing 11.

[0081] Specifically, along the length of the housing 11, a first epoxy board 23 is placed on one side of the first crossbeam 12, and then battery cells 14, buffer pads 15, ... buffer pads 15 and battery cells 14 are sequentially and alternately arranged on one side of the first epoxy board 23 to form a battery unit 16, and multiple battery units 16 are arranged sequentially in the width direction.

[0082] In some embodiments, please refer to Figure 1 and Figure 2 Step S3 further includes: placing the second epoxy board 24 between the second crossbeam 13 and the battery cell 14 along the length of the housing 11.

[0083] Specifically, a second epoxy plate 24 is provided on the side of the last battery cell 14 away from the first crossbeam 12, and then the second crossbeam 13 is provided on the side of the second epoxy plate 24 away from the first crossbeam 12.

[0084] Please see Figure 1 and Figure 2 In a battery cell 16, the first crossbeam 12 and the adjacent battery cell 14 are bonded together by the first epoxy board 23, and the adjacent battery cell 14 are bonded together by the second epoxy board 24. When a preload is applied to the second crossbeam 13, the multiple battery cells 14 and multiple buffer pads 15 in the battery cell 16 are tightly bonded together, eliminating the need to fill the gaps with potting compound in the battery cell 16, saving costs, and improving the structural strength of the battery module.

[0085] The first epoxy board 23 and the second epoxy board 24 are typically composite materials made of epoxy resin and other reinforcing materials (such as glass fiber or carbon fiber), exhibiting high heat resistance, good dimensional stability, and excellent mechanical properties. Therefore, when the first epoxy board 23 and the second epoxy board 24 are used in high-performance battery modules, they can withstand high temperatures and mechanical stresses.

[0086] In related technologies, during the assembly of battery modules, multiple crossbeams are typically placed at intervals within the housing, and then individual battery cells and buffer pads are placed between adjacent crossbeams. In this configuration, the gap between two adjacent battery cells along the length of the housing is 1.5mm, and the thickness of the buffer pad is 1.7mm. This causes the battery cells to easily shake during transfer and transportation, potentially leading to battery module failure.

[0087] Please see Figure 1 and Figure 2 The battery module assembly method provided in this application first fixes the first crossbeam 12 inside the housing 11, then stacks battery cells 14 and buffer pads 15 on one side of the first crossbeam 12 to form a battery unit 16, then sets the second crossbeam 13 on the side of the battery unit 16 away from the first crossbeam 12, finally applies a preload to the second crossbeam 13, and achieves a fixed connection between the second crossbeam 13 and the second connecting member 18 in the length direction through the third fixing member 21, and fixes the second crossbeam 13 to the bottom of the housing 11 through the fourth fixing member 22. This allows the battery cells 14 and buffer pads 15 to be tightly clamped between the first crossbeam 12 and the second crossbeam 13, ensuring that the battery cells 14, buffer pads 15, first crossbeam 12 and second crossbeam 13 are not prone to misalignment, facilitating the transfer and transportation of the battery module, and reducing the possibility of battery module failure due to shaking of the battery cells 14 under complex road conditions.

[0088] In some embodiments, please refer to Figure 1 and Figure 2 The assembly method for battery modules also includes:

[0089] S5. Place the pressure strip 25 on the battery cell 14. The pressure strip 25 extends along the width direction of the housing 11 and covers the gap between two adjacent battery cells 14. See [link / reference]. Figure 1 .

[0090] It is understandable that the pressure strip 25 is set on the top surface of two adjacent battery cells 16 and covers the gap between the two adjacent battery cells 16. This can increase the overall stability of the battery module and reduce the relative movement between battery cells 14.

[0091] S6. In the height direction of the housing 11, the pressure strip 25 and the first crossbeam 12 are fixedly connected by the fifth fastener 26, and the pressure strip 25 and the second crossbeam 13 are fixedly connected by the sixth fastener 27. See [reference needed] Figure 1 .

[0092] It is understandable that the pressure strip 25 is connected to the first crossbeam 12 by the fifth fastener 26, and the pressure strip 25 is connected to the second crossbeam 13 by the sixth fastener 27. This ensures that the battery module remains stable during transportation and use, and prevents the risk of the battery module loosening or falling off during vibration or impact.

[0093] In some embodiments, the battery module assembly method further includes:

[0094] S7. Connect the busbar 28 to the terminals of the battery cells 14 to achieve series or parallel connection between the individual battery cells 14. See [link to relevant documentation]. Figure 1 .

[0095] Busbar 28 can be connected to the terminal post of battery cell 14 by laser welding, thereby further improving the overall robustness of the battery module. Busbar 28 can be made of aluminum or copper.

[0096] In this embodiment, the first crossbeam 12 and the second crossbeam 13 fix the battery cell 14 and the buffer pad 15, ensuring that the battery cell 14, the buffer pad 15, the first crossbeam 12 and the second crossbeam 13 are not prone to misalignment, thereby ensuring that the busbar 28 and the terminal post of the battery cell 14 are kept aligned, effectively avoiding welding misalignment and reducing the possibility of safety hazards to the battery cell 14 due to welding misalignment of the busbar 28.

[0097] In some embodiments, please refer to Figure 1 and Figure 8 After the step of fixing the first crossbeam 12 inside the box body 11, the method further includes:

[0098] S101. A battery cell 14 and a buffer pad 15 are provided on the other side of the first crossbeam 12, and a buffer pad 15 is provided between two adjacent battery cells 14.

[0099] S102. The third crossbeam 29 is installed inside the housing 11, and the third crossbeam 29 is installed on the side of the battery cell 14 away from the first crossbeam 12.

[0100] S103. Apply a pre-tightening force to the third crossbeam 29 to compress the battery cell 14 and buffer pad 15 disposed between the first crossbeam 12 and the third crossbeam 29, and fix the third crossbeam 29 inside the housing 11.

[0101] Please see Figure 9 and Figure 10 Step S103 specifically includes the following steps:

[0102] S1031. The third connector 30 is disposed between the housing 11 and the battery cell 14, and the third connector 30 is disposed on the side of the third crossbeam 29 facing the first crossbeam 12.

[0103] S1032. The third crossbeam 29 and the third connecting piece 30 are fixedly connected in the length direction of the box body 11 by the seventh fastener 31;

[0104] S1033. The third crossbeam 29 is fixedly connected to the bottom of the box 11 via the eighth fastener 32 in the height direction of the box 11.

[0105] In step S103, since the first crossbeam 12 is fixed to the bottom of the housing 11 before the third crossbeam 29, after applying a preload to the third crossbeam 29, the third connector 30 is placed on the side of the third crossbeam 29 facing the first crossbeam 12. Then, the third crossbeam 29 and the third connector 30 are fixedly connected in the length direction by the seventh fastener 31, and the third crossbeam 29 is fixedly connected to the housing 11 by the eighth fastener 32. This ensures that the battery cell 14, the buffer pad 15, the first crossbeam 12, and the second crossbeam 13 are not prone to misalignment, which facilitates the transfer and transportation of the battery module and reduces the possibility of battery module failure due to shaking of the battery cell 14 under complex road conditions.

[0106] In some embodiments, please refer to Figure 9 and Figure 10 An epoxy board can be provided between the other side of the first crossbeam 12 and the battery cell 14, and an epoxy board can be provided between the third crossbeam 29 and the battery cell 14, so that the multiple battery cells 14 and multiple buffer pads 15 provided between the first crossbeam 12 and the third crossbeam 29 are tightly attached together, eliminating the need to fill the gaps in the battery cell 16 with potting compound, saving costs, and improving the structural strength of the battery module.

[0107] In the battery module assembly method of this application embodiment, multiple crossbeams can be provided. During the assembly of the housing 11, the first crossbeam 12 can be fixed to the middle of the housing 11 first. Then, battery cells 14 and buffer pads 15 are stacked on one or both sides of the first crossbeam 12. Next, the second crossbeam 13 or the third crossbeam 29 is placed inside the housing 11, and a preload force is applied to the second crossbeam 13 or the third crossbeam 29 toward the first crossbeam 12 to fix the second crossbeam 13 in the length direction and to make the multiple battery cells 14 and multiple buffer pads 15 fit tightly together. Finally, in the height direction, the second crossbeam 13 or the third crossbeam 29 is fixedly connected to the housing 11 by fasteners to further improve the overall structural strength.

[0108] Please see Figure 2 The application embodiment also provides a battery module, including a housing 11, a first crossbeam 12, a second crossbeam 13, a battery cell 14, and a buffer pad 15.

[0109] The first crossbeam 12 is fixed inside the housing 11. The second crossbeam 13 is fixed inside the housing 11 and is spaced apart from the first crossbeam 12 along the length of the housing 11. The battery cell 14 and the buffer pad 15 are disposed between the first crossbeam 12 and the second crossbeam 13, and the battery cell 14 and the buffer pad 15 are compressed by the first crossbeam 12 and the second crossbeam 13. A buffer pad 15 is disposed between two adjacent battery cells 14.

[0110] Understandably, the arrangement of the first crossbeam 12 and the second crossbeam 13 provides additional mechanical support, which is crucial for preventing the battery cell 16 from shifting or being damaged when subjected to external impacts. The presence of the first crossbeam 12 and the second crossbeam 13 increases the rigidity of the structure, thereby improving the overall system stability. By providing buffer pads 15 between adjacent battery cells 14, when the battery cell 16 is impacted, the buffer pads 15 can absorb some of the energy, thereby reducing the direct impact on the battery cell 14 itself, which helps to further protect the battery from physical damage.

[0111] In some embodiments, please refer to Figure 5 The battery module also includes a first fixing member 19, a first connecting member 17, and a second fixing member 20.

[0112] The first fixing member 19 is fixedly connected to the first crossbeam 12 and the bottom of the housing 11 in the height direction. The first connecting member 17 is disposed between the housing 11 and the battery cell 14, and is located on at least one side of the first crossbeam 12 in the length direction of the housing 11. The second fixing member 20 is fixedly connected to the first crossbeam 12 and the first connecting member 17 in the length direction of the housing 11. This not only increases the rigidity of the entire structure but also enhances the overall strength and impact resistance of the battery pack.

[0113] Please see Figure 7 In some embodiments, the battery module further includes a second connector 18, a third fastener 21, and a fourth fastener 22.

[0114] The second connector 18 is disposed between the housing 11 and the battery cell 14, and is located on the side of the second crossbeam 13 facing the first crossbeam 12. The third fastener 21 is fixedly connected to the second crossbeam 13 and the second connector 18 along the length of the housing 11. The fourth fastener 22 is fixedly connected to the bottom of the housing 11 along its height. This not only increases the rigidity of the entire structure but also enhances the overall strength and impact resistance of the battery pack.

[0115] During the assembly process, the first crossbeam 12 is first fixed to the housing 11. Then, battery cells 14 and buffer pads 15 are stacked on one side of the first crossbeam 12 to form a battery unit 16. Next, the second crossbeam 13 is placed on the side of the battery unit 16 away from the first crossbeam 12. Finally, a preload is applied to the second crossbeam 13, and the second crossbeam 13 and the second connecting member 18 are fixedly connected in the length direction by the third fixing member 21. The second crossbeam 13 is fixedly connected to the bottom of the housing 11 by the fourth fixing member 22. This ensures that the battery cells 14 and buffer pads 15 are tightly clamped between the first crossbeam 12 and the second crossbeam 13, preventing misalignment of the battery cells 14, buffer pads 15, first crossbeam 12, and second crossbeam 13. This facilitates the transfer and transportation of the battery module and reduces the possibility of battery module failure due to shaking of the battery cells 14 under complex road conditions.

[0116] In some embodiments, please refer to Figure 2 The battery module also includes a first epoxy plate 23 and a second epoxy plate 24.

[0117] The first epoxy board 23 is disposed between the first crossbeam 12 and the battery cell 14 along the length of the housing 11. The second epoxy board 24 is disposed between the second crossbeam 13 and the battery cell 14 along the length of the housing 11.

[0118] In a battery cell 16, a first crossbeam 12 and a nearby battery cell 14 are bonded together by a first epoxy board 23, and a second epoxy board 24 is bonded together with the nearby battery cell 14. When a preload is applied to the second crossbeam 13, the multiple battery cells 14 and multiple buffer pads 15 in the battery cell 16 are tightly bonded together, eliminating the need to fill the gaps with potting compound in the battery cell 16, saving costs, and improving the structural strength of the battery module.

[0119] In some embodiments, the battery module further includes a pressure strip 25, which is disposed on the battery cell 14 and extends along the width direction of the housing 11, covering the gap between two adjacent battery cells 14.

[0120] It is understandable that the pressure strip 25 is set on the top surface of two adjacent battery cells 16 and covers the gap between the two adjacent battery cells 16. This can increase the overall stability of the battery module and reduce the relative movement between battery cells 14.

[0121] In some embodiments, please refer to Figure 2 The battery module also includes a fifth fixing component 26 and a sixth fixing component 27.

[0122] The fifth fastener 26 fixes the pressure strip 25 and the first crossbeam 12, and the sixth fastener 27 fixes the pressure strip 25 and the second crossbeam 13.

[0123] It is understandable that the pressure strip 25 is connected to the first crossbeam 12 by the fifth fastener 26, and the pressure strip 25 is connected to the second crossbeam 13 by the sixth fastener 27. This ensures that the battery module remains stable during transportation and use, and prevents the risk of the battery module loosening or falling off during vibration or impact.

[0124] In some embodiments, please refer to Figure 2 The battery module also includes a busbar 28, which is electrically connected to the terminals of the battery cells 14 so that the individual battery cells 14 can be connected in series or in parallel.

[0125] Busbar 28 can be connected to the terminal post of battery cell 14 by laser welding, thereby further improving the overall robustness of the battery module. Busbar 28 can be made of aluminum or copper.

[0126] Please see Figure 2 In this embodiment of the application, the first crossbeam 12 and the second crossbeam 13 fix the battery cell 14 and the buffer pad 15, ensuring that the battery cell 14, the buffer pad 15, the first crossbeam 12 and the second crossbeam 13 are not prone to misalignment, thereby ensuring that the busbar 28 and the terminal post of the battery cell 14 are kept aligned, effectively avoiding welding misalignment and reducing the possibility of safety hazards to the battery cell 14 due to welding misalignment of the busbar 28.

[0127] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0128] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0129] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0130] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A method for assembling a battery module, characterized in that, include: Fix the first crossbeam inside the box; Multiple battery cells and multiple buffer pads are stacked inside the box on one side of the first crossbeam, with a buffer pad placed between two adjacent battery cells. The second crossbeam is disposed inside the housing, and the second crossbeam is disposed on the side of the battery cell away from the first crossbeam; A preload is applied to the second crossbeam to compress the battery cell and the buffer pad disposed between the first crossbeam and the second crossbeam, thereby fixing the second crossbeam into the housing.

2. The assembly method of the battery module according to claim 1, characterized in that, The step of fixing the first crossbeam to the box body includes: The first crossbeam is fixedly connected to the bottom of the box body in the height direction by a first fastener; The first connector is disposed between the housing and the battery cell, and the first connector is disposed on at least one side of the first crossbeam in the length direction of the housing; Along the length of the box body, the first crossbeam and the first connecting member are fixedly connected by a second fastener.

3. The assembly method of the battery module according to claim 1, characterized in that, The step of applying preload to the second crossbeam includes: The second connector is disposed between the housing and the battery cell, and the second connector is disposed on the side of the second crossbeam facing the first crossbeam; Along the length of the housing, the second crossbeam and the second connecting member are fixedly connected by a third fastener; The second crossbeam is fixedly connected to the bottom of the box body by a fourth fastener in the height direction of the box body.

4. The assembly method of the battery module according to claim 1, characterized in that, The step of placing the battery cell and buffer pad inside the housing on one side of the first crossbeam further includes: Along the length of the housing, a first epoxy board is disposed between the first crossbeam and the battery cell; The step of placing the second crossbeam inside the box also includes: Along the length of the housing, a second epoxy board is disposed between the second crossbeam and the battery cell.

5. The assembly method of the battery module according to claim 1, characterized in that, Also includes: A pressure strip is placed on the battery cell, the pressure strip extends along the width direction of the housing and covers the gap between two adjacent battery cells; In the height direction of the housing, the pressure strip and the first crossbeam are fixedly connected by a fifth fastener, and the pressure strip and the second crossbeam are fixedly connected by a sixth fastener.

6. The assembly method of the battery module according to any one of claims 1-5, characterized in that, After the step of fixing the first crossbeam into the box body, the method further includes: A battery cell and a buffer pad are provided on the other side of the first crossbeam, and a buffer pad is provided between two adjacent battery cells. A third crossbeam is disposed inside the housing, and the third crossbeam is disposed on the side of the battery cell away from the first crossbeam; A preload is applied to the third crossbeam to compress the battery cell and the buffer pad disposed between the first crossbeam and the third crossbeam, thereby fixing the third crossbeam into the housing.

7. A battery module, characterized in that, include: Box; The first crossbeam is fixed inside the box. The second crossbeam is fixed inside the box and is spaced apart from the first crossbeam along the length of the box. A battery cell and a buffer pad are disposed between the first crossbeam and the second crossbeam, and the battery cell and the buffer pad are squeezed by the first crossbeam and the second crossbeam, wherein a buffer pad is disposed between two adjacent battery cells.

8. The battery module according to claim 7, characterized in that, Also includes: The first fastener is used to fix the first crossbeam to the bottom of the box body in the height direction of the box body; A first connector is disposed between the housing and the battery cell, and the first connector is disposed on at least one side of the first crossbeam in the length direction of the housing; The second fastener is used to fix the first crossbeam and the first connector along the length of the housing.

9. The battery module according to claim 7, characterized in that, Also includes: The second connector is disposed between the housing and the battery cell, and the second connector is disposed on the side of the second crossbeam facing the first crossbeam; The third fastener is used to fix the second crossbeam and the second connector in the length direction of the box body; The fourth fastener is used to fix the second crossbeam to the bottom of the box body in the height direction of the box body.

10. The battery module according to claim 7, characterized in that, Also includes: A first epoxy board is disposed between the first crossbeam and the battery cell along the length of the housing. The second epoxy board is disposed between the second crossbeam and the battery cell in the length direction of the housing.

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