Welding fixing device of battery module box body
By using brackets and plate structures in the battery module housing welding fixing device, the upper and lower housing flange edges are precisely aligned in three-dimensional space, which solves the problem of declining welding quality and improves welding strength and sealing performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, misalignment of the upper and lower flange edges during battery module housing welding leads to a decline in welding quality, affecting sealing and strength.
The first and second plates on the bracket are used to fix the flange edges of the upper and lower boxes by the first and second fixing parts, respectively. The mechanical limiting structure ensures that the flange edges are accurately aligned in three-dimensional space, eliminating the offset caused by manual placement.
This achieves precise alignment of the upper and lower housing flange edges, improves the uniformity and sealing of the welded joints, and enhances the quality of the battery module products.
Smart Images
Figure CN224209370U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery production technology, and in particular to a welding and fixing device for a battery module housing. Background Technology
[0002] As the most representative industry of new energy vehicles, pure electric vehicles are currently experiencing rapid growth. The power battery, as one of the core components of a pure electric vehicle, determines the overall strength of the module through the welding quality of its outer casing. Currently, the main challenges in welding the two upper and lower casings are ensuring alignment and preventing light leakage at the weld joints, and ensuring that the welding does not penetrate the internal module when the flange edge of the casing is welded through. To achieve these goals, the flange edges of the upper and lower casings need to be aligned using a fixture before welding. This process is generally done manually, which can lead to misalignment of the flange edges after placement, resulting in poor welding quality and affecting the quality of the battery module product. Utility Model Content
[0003] The purpose of this utility model is to provide a welding and fixing device for battery module housings, which can eliminate the offset caused by manual placement, solve the problems of flange misalignment and light leakage, ensure the uniformity of welding joints, significantly improve welding strength and sealing performance, and further improve the quality of battery module products.
[0004] To achieve the above objectives, this utility model provides a welding and fixing device for a battery module housing. The battery module housing includes a lower housing and an upper housing, and both the upper housing and the lower housing are provided with flange edges, including:
[0005] A bracket having two perpendicular directions: a first direction, a second direction, and a third direction.
[0006] The second plate is fixed to one side of the bracket in a third direction. The second plate has a second fixing position to connect and fix the upper box. The second plate has a second through hole along the third direction.
[0007] A first plate is disposed on one side of the second plate in a third direction. The first plate is connected to the bracket and can move upward along the third direction. The second plate is spaced apart from the first plate to form an installation space for accommodating the upper box and the lower box. The first plate has a first fixing position to connect and fix the lower box. The first plate has a first through hole along the third direction.
[0008] The first fastener passes through the first through hole and abuts against the flange edge of the lower housing in the third direction.
[0009] The second fastener passes through the second through hole and abuts against the flange edge of the upper housing in the third direction.
[0010] Compared with the prior art, the welding and fixing device for a battery module housing according to this utility model embodiment has the following advantages: A first plate and a second plate are fixed on the bracket, and a first fixing member and a second fixing member are respectively provided on the first plate and the second plate; the first fixing member and the second fixing member are used to fix the upper housing and the lower housing respectively. The first fixing member is inserted into the first through hole on the first plate, and the second fixing member is inserted into the second through hole on the second plate. The first fixing member abuts against the flange edge of the lower housing, and the second fixing member abuts against the flange edge of the upper housing; before welding, the upper housing is placed below the second plate, and the flange edge of the upper housing is fixed by the second fixing member. Then the lower housing is placed on the first plate, and the first fixing member abuts against the flange edge of the lower housing; when the upper housing and the lower housing are fixed, the flange edges of the upper housing and the lower housing are aligned. Then the first fixing member and the first plate move together in a third direction so that the flange edge of the lower housing abuts against the flange edge of the upper housing, completing the fixing of the battery module housing before welding, which facilitates the subsequent welding operation. This application, through a layered design of the first and second plates and a structure in which the first plate can move along a third direction, combined with the mechanical limiting of the first and second fixing positions, ensures precise alignment of the flange edges of the lower and upper housings in three-dimensional space. The first and second fixing members pass through the first through hole and the second flange edge of the lower and upper housings respectively, applying a vertical clamping force to eliminate offset caused by manual placement. This fundamentally solves the problems of flange edge misalignment and light leakage, ensures the uniformity of the welded joints, significantly improves welding strength and sealing performance, and further enhances the quality of the battery module product.
[0011] The welding and fixing device for the battery module housing of this utility model embodiment further includes a third plate, which is slidably connected to the bracket in the third direction. The third plate is fixedly connected to the first plate in the third direction. A first driving mechanism is provided on the third plate, which is connected to and drives the first fixing member.
[0012] The welding and fixing device for the battery module housing of this utility model embodiment has multiple first through holes arranged around the first fixing position, and multiple first fixing members are also provided, each of which is connected to the first driving mechanism.
[0013] The welding and fixing device for the battery module housing of this utility model embodiment includes a guide rail extending along the third direction on the bracket, and a slider slidably connected inside the guide rail. The third plate is connected to the slider in the second direction.
[0014] The welding and fixing device for the battery module housing of this utility model embodiment includes a fifth plate provided on one side of the third plate along the third direction, and a second driving mechanism provided on the fifth plate. The second driving mechanism is connected to and drives the third plate to move upward along the third direction.
[0015] The welding and fixing device for the battery module housing of this utility model embodiment has multiple second through holes arranged around the second fixing position. The second plate is connected to a third driving mechanism on one side of the second direction. The third driving mechanism is connected to and drives the second fixing member to move along the third direction.
[0016] The welding and fixing device for the battery module housing of this utility model embodiment further includes a fourth plate, which is connected to the second plate in a third direction. The fourth plate extends along the second direction and is connected to the output shaft of the third drive mechanism. The third drive mechanism drives the fourth plate to move along the third direction, and the second fixing member is fixed to the fourth plate.
[0017] The welding and fixing device for the battery module housing of this utility model embodiment includes a plurality of first positioning members on the first plate, which are arranged around the first fixing position to fix the lower housing.
[0018] The welding and fixing device for the battery module housing of this utility model embodiment includes a first positioning component comprising a fourth driving mechanism and a positioning plate. The fourth driving mechanism is fixed to the first plate, and the output shaft of the fourth driving mechanism is connected to the positioning plate and drives the positioning plate to abut against the lower housing along the first direction or the second direction.
[0019] The welding and fixing device for the battery module housing of this utility model embodiment has a third through hole opened in the third direction at the second fixing position, and a second positioning member is inserted in the third through hole. The second positioning member is used to fix the upper housing of the battery module.
[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the welding and fixing device for the battery module housing according to an embodiment of the present invention;
[0022] Figure 2 This is a structural schematic diagram of the welding and fixing device for the battery module housing according to another embodiment of the present utility model;
[0023] Figure 3 This is a schematic diagram of the welding and fixing device for the battery module housing of this utility model without the fourth plate.
[0024] Figure 4 This is a schematic diagram of the structure of the first plate of the welding and fixing device for the battery module housing according to an embodiment of the present utility model;
[0025] Figure 5 This is a schematic diagram of the structure of the second plate of the welding and fixing device for the battery module housing according to an embodiment of the present invention;
[0026] In the diagram, 1 is the bracket; 11 is the guide rail; 12 is the slider; X is the first direction; Y is the second direction; Z is the third direction; 2 is the first plate; 21 is the first fixed position; 22 is the first through hole; 3 is the second plate; 31 is the second fixed position; 32 is the second through hole; 33 is the third through hole; 4 is the first fixing member; 41 is the first driving mechanism; 5 is the second fixing member; 51 is the third driving mechanism; 6 is the third plate; 61 is the second driving mechanism; 62 is the fifth plate; 7 is the fourth plate; 8 is the first positioning member; 81 is the fourth driving mechanism; 82 is the positioning plate; and 9 is the second positioning member. Detailed Implementation
[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0030] In the description of this application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 85° to 95°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.
[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0032] like Figure 1 and Figure 2 As shown in the figure, a preferred embodiment of the present invention provides a welding and fixing device for a battery module housing. The battery module housing includes a lower housing and an upper housing. Both the upper housing and the lower housing are provided with flange edges, which are used to weld and fix the upper and lower housings together.
[0033] The welding and fixing device for the battery module housing includes a bracket 1, which is vertically arranged. The bracket 1 has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The first direction X is the length direction of the bracket 1, the second direction Y is the width direction of the bracket 1, and the third direction Z is the height direction of the bracket 1.
[0034] like Figure 4 and Figure 5 As shown, a preferred embodiment of the welding and fixing device for a battery module housing of this utility model further includes a first plate 2 and a second plate 3 spaced apart along a third direction Z. The second plate 3 is fixed to one side of the bracket 1 along the third direction Z, specifically the top of the bracket 1. The second plate 3 has a second fixing position 31 for connecting and fixing the upper housing, and the second fixing position 31 is specifically located in the middle of the second plate 3. The second plate 3 has a second through hole 32 along the third direction Z, and the second through hole 32 is located at the center of the second fixing position 31. The first plate 2 is located on one side of the second plate 3 along the third direction Z. The first plate 2 is movably connected to the bracket 1 and can move upward along the third direction Z. The second plate 3 is spaced apart from the first plate 2 to form an installation space for accommodating the upper and lower boxes. The height of the installation space matches the height of the battery module box. The first plate 2 has a first fixing position 21 to connect and fix the lower box. The first fixing position 21 is located in the middle of the first plate 2. The first plate 2 has a first through hole 22 along the third direction Z. The first through hole 22 is located outside the first fixing position 21. Specifically, the first plate 2 and the second plate 3 are arranged parallel to each other.
[0035] A preferred embodiment of the welding and fixing device for a battery module housing of this utility model further includes a first fixing member 4 and a second fixing member 5. The first fixing member 4 is inserted through a first through hole 22 in the third direction Z and abuts against the flange edge of the lower housing in the third direction Z, so that the flange edge of the lower housing is supported during the fixing and welding process. The second fixing member 5 is inserted through a second through hole 32 in the third direction Z and abuts against the flange edge of the upper housing in the third direction Z, so that the flange edge of the upper housing is pressed against the flange edge of the lower housing, ensuring that the flange edges of the upper and lower housings are firmly fixed during the welding process.
[0036] In this application, a first plate 2 and a second plate 3 are fixed on the bracket 1. A first fixing member 4 and a second fixing member 5 are respectively provided on the first plate 2 and the second plate 3. The first fixing member 4 and the second fixing member 5 are used to fix the upper box and the lower box, respectively. The first fixing member 4 passes through the first through hole 22 on the first plate 2, and the second fixing member 5 passes through the second through hole 32 on the second plate 3. The first fixing member 4 abuts against the flange edge of the lower box, and the second fixing member 5 abuts against the flange edge of the upper box. Following the previous steps, the upper housing is placed below the second plate 3, and the flange edge of the upper housing is fixed by the second fixing member 5. Then, the lower housing is placed on the first plate 2, and the first fixing member 4 abuts against the flange edge of the lower housing. When the upper and lower housings are fixed, their flange edges are aligned. Then, the first fixing member 4 and the first plate 2 move together along the third direction Z so that the flange edge of the lower housing abuts against the flange edge of the upper housing, completing the fixing of the battery module housing before welding, which facilitates subsequent welding operations. This application, through the layered design of the first plate 2 and the second plate 3 and the structure that the first plate 2 can move along the third direction Z, combined with the mechanical limiting of the first fixing position 21 and the second fixing position 31, ensures that the flange edges of the lower housing and the upper housing are precisely aligned in three-dimensional space. The first fixing member 4 and the second fixing member 5 pass through the first through hole 22 and the second flange edge of the lower and upper housing respectively, and apply a vertical clamping force to eliminate the offset caused by manual placement, fundamentally solve the problems of flange edge misalignment and light leakage, ensure the uniformity of the welded joint, significantly improve the welding strength and sealing performance, and further improve the quality of battery module products.
[0037] In some embodiments of this utility model, a third plate 6 is also included, which is parallel to the first plate 2. The third plate 6 is slidably connected to the bracket 1 in the third direction Z, and the third plate 6 is fixedly connected to the first plate 2 in the third direction Z. Therefore, when the third plate 6 moves in the third direction Z, it can drive the first plate 2 to move toward or away from the second plate 3, so that the first plate 2 completes the movement process of driving the lower box to move or reset. A first driving mechanism 41 is provided on the third plate 6. The first driving mechanism 41 is connected to and drives the first fixing member 4. The first driving mechanism 41 includes a motor or cylinder, etc. The first driving mechanism 41 is vertically arranged in the third direction Z, and its output end is connected to the first fixing member 4 to drive the first fixing member 4 to rise and abut against the flange edge of the lower box.
[0038] In some embodiments of this utility model, multiple first through holes 22 are provided, and multiple first through holes 22 are arranged around the first fixing position 21. Multiple first fixing members 4 are also provided, and multiple first fixing members 4 abut against the flange edge of the lower box body through the first through holes 22, so that each flange edge arranged around the lower box body can be adequately supported, and each flange edge is subjected to uniform force during the rising process, ensuring the stability of the lower box body during the fixing with the upper box body, which is beneficial to improving the welding efficiency and welding effect. Each first fixing member 4 is connected to the first driving mechanism 41. The first driving mechanism 41 can be set as one or more, that is, one first driving mechanism 41 connects multiple first fixing members 4 and drives multiple first fixing frames at the same time. Alternatively, multiple first driving members can be arranged on the third plate 6, and each first driving member is connected to one first driving member. The above embodiments are only required to achieve uniform support of the flange edge of the lower box body in the third direction Z, and no specific limitation is made here.
[0039] In some embodiments of this utility model, the bracket 1 is provided with a guide rail 11 extending along the third direction Z. The guide rails 11 are arranged opposite to each other on different brackets 1, and are located on both sides of the third plate 6 in the second direction Y. Each guide rail 11 is slidably connected with a slider 12. The sliders 12 are connected to both sides of the third plate 6 in the second direction Y. The third plate 6 is guided by the sliders 12 slidably connected to the guide rails to move smoothly in the third direction Z, which further drives the first plate 2 to move smoothly in the third direction Z, ensuring the stability and reliability of the movement process of the lower box fixed in the first fixed position 21.
[0040] In some embodiments of this utility model, a fifth plate 62 is provided on one side of the third plate 6 along the third direction Z, and the fifth plate 62 is fixedly disposed; a second driving mechanism 61 is provided on the fifth plate 62, and the second driving mechanism 61 is connected to and drives the third plate 6 to move in the third direction Z; specifically, the fifth plate 62 includes a handwheel horizontally disposed within the screen formed by the first direction X and the second direction Y, and a lead screw or screw is connected to the handwheel in the third direction Z to convert the horizontal rotation of the handwheel into movement in the third direction Z, and the end of the lead screw or screw is connected to the third plate 6 to provide power for the movement of the third plate 6 in the third direction Z. Further, the second driving mechanism 61 may also be a cylinder or a motor, etc.
[0041] In some embodiments of this utility model, multiple second through holes 32 are provided, and the multiple second through holes 32 are arranged around the second fixing position 31. A second fixing member 5 is inserted in each through hole, so that the second fixing member 5 is also arranged around the second fixing position 31 to provide pressure on the flange edge arranged around the upper box body, so that the flange edge of the upper box body can be firmly pressed onto the flange edge of the lower box body during the fixing process. A third driving mechanism 51 is connected to the second plate body 3 on one side of the second direction Y. The third driving mechanism 51 is connected to and drives the second fixing member 5 to move along the third direction Z. The third driving mechanism 51 includes a cylinder or a motor, etc. The third driving mechanism 51 can be set as one or more. When the third driving mechanism 51 is set as multiple, it can apply force to the second plate body 3 in multiple directions to ensure the stability of the movement process of the second plate body 3 in the third direction Z.
[0042] In some embodiments of this utility model, a fourth plate 7 is also included. The fourth plate 7 is located at the top of the entire device in the third direction Z and is arranged parallel to the second plate 3. The fourth plate 7 is connected to the second plate 3 in the third direction Z. The fourth plate 7 extends along the second direction Y and is connected to the output shaft of the third drive mechanism 51. The third drive mechanism 51 drives the fourth plate 7 to move in the third direction Z. The second fixing member 5 is fixed to the fourth plate 7. The fourth plate 7 serves as a connecting member between the second plate 3 and the third drive mechanism 51. Under the driving force of the third drive mechanism 51, it moves in the third direction Z and drives the second plate 3 to move in the third direction Z, so that the upper box located at the second fixed position 31 moves stably towards the lower box.
[0043] In some embodiments of this utility model, a plurality of first positioning members 8 are also provided on the first plate 2. The plurality of first positioning members 8 are arranged around the first fixed position 21 in the horizontal direction to adjust the lower box body. Before the lower box body and the upper box body are closed, the first positioning members 8 make a fine adjustment to the position of the lower box body so that the flange edges of the upper box body and the lower box body are aligned, ensuring that the flange edges of the upper box body and the lower box body will not be affected by slight displacement during the welding process, thus ensuring the final welding quality.
[0044] In some embodiments of this utility model, the first positioning member 8 includes a fourth driving mechanism 81 and a positioning plate 82. The fourth driving mechanism 81 includes a cylinder or a motor, etc. The fourth driving mechanism 81 is fixed to the first plate 2 in the third direction Z. The output shaft of the fourth driving mechanism 81 extends along the first direction X and connects to the positioning plate 82. The fourth driving mechanism 81 drives the positioning plate 82 to abut against the lower box body along the first direction X or the second direction Y. The adjustment is made according to the deviation of the flange edges of the lower box body and the upper box body in the first direction X and the second direction Y, so that the flange edges of the lower box body and the upper box body are aligned in the first direction X and the second direction Y, and then the lower box body and the upper box body move in the third direction Z.
[0045] like Figure 3 As shown, in some embodiments of this utility model, the second fixing position 31 is provided with a third through hole 33 along the third direction Z; specifically, the third through hole 33 is located at the center of the second fixing position 31; a second positioning member 9 is provided inside the third through hole 33, the second positioning member 9 is used to fix the upper housing of the battery module, the second positioning member 9 includes a vacuum suction cup, etc., to securely fix the upper housing in the third direction Z, and prevent the upper housing from suddenly falling during the fixing process, causing damage to the product and device.
[0046] The working process of this utility model is as follows: Before welding, the upper box is placed below the second plate 3, and the flange edge of the upper box is fixed by the second fixing member 5. Then, the lower box is placed on the first plate 2, and the first fixing member 4 abuts against the flange edge of the lower box. At this time, the first positioning member 8 makes a fine adjustment to align the flange edges of the upper and lower boxes. After the flange edges of the upper and lower boxes are aligned, the first fixing member 4 and the first plate 2 move together along the third direction Z so that the flange edge of the lower box abuts against the flange edge of the upper box, thus completing the fixing of the battery module box before welding, which facilitates the subsequent welding operation.
[0047] In summary, this utility model embodiment provides a welding and fixing device for a battery module housing. Through the layered design of the first plate 2 and the second plate 3, and the structure in which the first plate 2 can move along the third direction Z, combined with the mechanical limiting of the first fixing position 21 and the second fixing position 31, it ensures that the flange edges of the lower housing and the upper housing are precisely aligned in three-dimensional space. It eliminates the offset caused by manual placement, fundamentally solves the problems of flange edge misalignment and light leakage, ensures the uniformity of the welded joint, significantly improves the welding strength and sealing performance, and further improves the quality of the battery module product.
[0048] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.
Claims
1. A welding and fixing device for a battery module housing, the battery module housing comprising a lower housing (10) and an upper housing (20), wherein both the upper housing (20) and the lower housing (10) are provided with flange edges, characterized in that, include: A bracket (1) having a first direction (X), a second direction (Y) and a third direction (Z) that are perpendicular to each other; The second plate (3) is fixed to one side of the bracket (1) in the third direction (Z). The second plate (3) has a second fixing position (31) to connect and fix the upper box (20). The second plate (3) has a second through hole (32) along the third direction (Z). The first plate (2) is disposed on one side of the third direction (Z) of the second plate (3). The first plate (2) is connected to the bracket (1) and can move along the third direction (Z). The second plate (3) is spaced apart from the first plate (2) to form an installation space for accommodating the upper box (20) and the lower box (10). The first plate (2) has a first fixing position (21) to connect and fix the lower box (10). The first plate (2) has a first through hole (22) along the third direction (Z). The first fastener (4) passes through the first through hole (22) and abuts against the flange edge of the lower housing (10) in the third direction (Z). The second fastener (5) passes through the second through hole (32) and abuts against the flange edge of the upper housing (20) in the third direction (Z).
2. The welding and fixing device for the battery module housing according to claim 1, characterized in that: It also includes a third plate (6), which is slidably connected to the bracket (1) in the third direction (Z). The third plate is fixedly connected to the first plate (2) in the third direction (Z). A first driving mechanism (41) is provided on the third plate (6), which is connected to and drives the first fixing member (4).
3. The welding and fixing device for the battery module housing according to claim 2, characterized in that: Multiple first through holes (22) are provided, and multiple first through holes (22) are provided around the first fixing position (21). Multiple first fixing members (4) are also provided, and each first fixing member (4) is connected to the first driving mechanism (41).
4. The welding and fixing device for the battery module housing according to claim 2, characterized in that: The bracket (1) is provided with a guide rail (11) extending along the third direction (Z), and a slider (12) is slidably connected in the guide rail (11). The third plate (6) is connected to the slider (12) in the second direction (Y).
5. The welding and fixing device for the battery module housing according to claim 2, characterized in that: The third plate (6) is provided with a fifth plate (62) on one side along the third direction. The fifth plate (62) is provided with a second driving mechanism (61), which connects to and drives the third plate (6) to move in the third direction (Z).
6. The welding and fixing device for the battery module housing according to claim 1, characterized in that: The second through hole (32) is provided in multiple ways, and the multiple second through holes (32) are arranged around the second fixing position (31). The second plate (3) is connected to a third driving mechanism (51) on one side of the second direction (Y). The third driving mechanism (51) connects to and drives the second fixing member (5) to move along the third direction (Z).
7. The welding and fixing device for the battery module housing according to claim 6, characterized in that: It also includes a fourth plate (7), which is connected to the second plate (3) in the third direction (Z). The fourth plate (7) extends along the second direction (Y) and is connected to the output shaft of the third drive mechanism (51). The third drive mechanism (51) drives the fourth plate (7) to move along the third direction (Z). The second fixing member (5) is fixed to the fourth plate (7).
8. The welding and fixing device for the battery module housing according to claim 1, characterized in that: The first plate (2) is also provided with a plurality of first positioning members (8), which are arranged around the first fixing position (21) to fix the lower box (10).
9. The welding and fixing device for the battery module housing according to claim 8, characterized in that: The first positioning component (8) includes a fourth driving mechanism (81) and a positioning plate (82). The fourth driving mechanism (81) is fixed to the first plate (2). The output shaft of the fourth driving mechanism (81) is connected to the positioning plate (82) and drives the positioning plate (82) to abut against the lower housing (10) along the first direction (X) or the second direction (Y).
10. The welding and fixing device for the battery module housing according to claim 1, characterized in that: The second fixing position (31) has a third through hole (33) along the third direction (Z), and a second positioning member (9) is inserted in the third through hole (33). The second positioning member (9) is used to fix the upper housing (20) of the battery module.