Thin-wall battery shell clamping device and welding device

Abstract

The utility model discloses a thin-wall battery shell clamping device and a welding device. The thin-wall battery shell clamping device comprises a rack; the length end of the cantilever beam is fixedly installed on the rack, the other length end of the cantilever beam is arranged in a suspended mode, and the cantilever beam is provided with a welding top face and clamping side faces located on the two sides of the welding top face; the clamping assembly is used for pressing a side plate of the battery shell on the clamping side surface and pressing two splicing parts of the battery shell on the welding top surface; the ceramic piece is arranged on the upper side of the cantilever cross beam; when the clamping assembly clamps the battery shell, a welding seam between the two splicing parts on the battery shell is located above the ceramic piece. By the adoption of the scheme, the thin-wall battery shell clamping device and the welding device have the advantages that the ceramic piece is arranged to support the splicing part at the weld joint to keep flat, and the situation that the weld joint is enlarged due to the fact that the splicing part is suspended and warped at the weld joint and the battery shell is warped after welding is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of welding devices, and in particular relates to a thin-wall battery shell clamping device and a welding device. Background Art

[0002] Chinese patent number CN202311371455.X discloses a "fixing device for welding blade battery shells", which uses a cantilever beam as a carrier to allow a square battery shell to be inserted from one end of the cantilever beam that is suspended in the air, and then the left and right side walls of the battery shell are clamped by clamps on the left and right sides, and downward clamps are also arranged on the left and right side clamps, so that the downward clamps are respectively downward to clamp the top surfaces on the left and right sides of the battery shell, and then the gap between the top surfaces on the left and right sides of the battery shell can be welded.

[0003] The disadvantage of the above-mentioned fixing device is that in order to prevent the solder from welding the battery shell and the cantilever beam, it is necessary to make a groove on the upper side of the cantilever beam to avoid it. However, due to the groove on the upper side of the cantilever beam, when the battery shell is clamped, the battery shell cannot be supported in a plane at the gap and is prone to warping, which may easily lead to problems such as enlarged welding gap and unevenness after welding, thereby affecting the quality of the battery shell. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a thin-walled battery shell clamping device and a welding device, which can support the splicing part at the weld by arranging ceramic parts to keep it flat, prevent the splicing part from being suspended and warping at the weld, thereby causing the weld to enlarge and the battery shell to warp after welding.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A thin-walled battery shell clamping device comprises: a frame; a cantilever beam, wherein one end of the cantilever beam is fixedly mounted on the frame and the other end is suspended, and the cantilever beam is provided with a welding top surface and clamping side surfaces located on both sides of the welding top surface; a clamping assembly, wherein the clamping assembly is used to press the side panels of the battery shell onto the clamping side surfaces, and / or the clamping assembly is used to press two spliced portions of the battery shell onto the welding top surface; a ceramic component, wherein the ceramic component is arranged on the upper side of the cantilever beam; when the clamping assembly clamps the battery shell, the weld between the two spliced portions on the battery shell is located above the ceramic component.

[0007] The present utility model is further configured as follows: a guiding slide rail is provided on the frame; the clamping assembly includes a clamping slide seat, side wall clamps, a top driving member, and side wall driving members; the clamping slide seat is provided with a first pressing portion and a second pressing portion, a welding gap is provided between the first pressing portion and the second pressing portion, and the clamping slide seat is fitted to the guiding slide rail; the side wall clamps are provided on the frame and / or the cantilever beam, the number of the side wall clamps is two groups, and they are respectively located on both sides of the cantilever beam; the top driving member is used to drive the clamping slide seat to move so as to slide and drive the first pressing portion and the second pressing portion to approach or move away from the welding top surface synchronously; the side wall driving members are used to drive the side wall clamps to approach or move away from the clamping side surface.

[0008] The present utility model is further configured as follows: a support member is provided on the frame, the support member is located below the cantilever beam near the suspended end, and the support member works to support the cantilever beam by abutting against it upward or release the support for the cantilever beam downward.

[0009] The present utility model is further configured as follows: a top clamp is detachably provided on the clamping slide seat, the top clamp is annularly arranged, and the first pressing portion and the second pressing portion are integrally formed on the inner peripheral wall of the top clamp.

[0010] The present utility model is further configured as follows: the frame includes a lower seat body and an upper seat body, the lower seat body and the upper seat body are connected by a plurality of guiding slide rails, the top driving member is provided on the upper seat body and drives the clamping slide seat downward, and a reset member is provided between the lower seat body and the clamping slide seat, and the reset member is used to reset the clamping slide seat upward.

[0011] The present utility model is further configured as follows: a stroke limiting member is provided on the frame, and the stroke limiting member is located on the upward and / or downward movement track of the clamping slide seat.

[0012] The present utility model is further configured as follows: a positioning member is provided at one end of the cantilever beam fixed to the frame, and a pushing assembly is provided on the frame and / or the clamping slide seat, and the pushing assembly is used to push the battery housing sleeved on the cantilever beam toward the positioning member to realize the clamping and positioning of the battery housing.

[0013] The present utility model is further configured as follows: the pushing assembly includes a first driving member, a first slide seat, a second driving member, and a second slide seat, the first driving member is used to drive the first slide seat to slide along the length direction of the cantilever beam, the second driving member is provided on the first slide seat, and the second driving member is used to drive the second slide seat to approach or move away from the cantilever beam.

[0014] The present utility model is further configured as follows: an internal groove is provided on the welding top surface, the ceramic part is arranged in the internal groove, and the upper surface of the ceramic part and the welding top surface are coplanar; alternatively, the welding top surface is the upper surface of the ceramic part; preferably, the ceramic part adopts a silicon carbide SC200 ceramic plate.

[0015] By adopting the above technical solution, after the battery housing is sleeved on the cantilever beam, the battery housing is clamped by the clamping assembly. At this time, since the splicing part is supported by the ceramic part, the two splicing parts are flat and relatively oriented, so as to minimize the weld seam, and thus the surface of the welded battery housing is smoother and the welding quality is higher.

[0016] A thin-walled battery housing welding device includes a welding machine and the above-mentioned thin-walled battery housing clamping device; a laser injection opening is provided above the frame, the welding machine adopts a laser welding machine, and the welding head of the laser welding machine is located above the laser injection opening. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is the assembly drawing of Embodiment 1 of the present utility model;

[0019] Figure 2 It is the cross-sectional view of Embodiment 1 of the present utility model;

[0020] Figure 3 It is the cross-sectional view of Embodiment 1 of the present utility model;

[0021] Figure 4 It is the exploded view of Embodiment 1 of the present utility model;

[0022] Figure 5 It is Figure 3 the enlarged view of A in

[0023] Figure 6 It is Figure 2 the enlarged view of B in

[0024] Figure 7 It is Figure 2 the enlarged view of C in

[0025] Figure 8 It is the part drawing of the top clamp in Embodiment 1 of the present utility model;

[0026] Figure 9For Figure 4 An enlarged view of D in

[0027] Figure 10 This is the assembly drawing of the pushing component in the first embodiment of the present utility model;

[0028] Figure 11 This is the assembly drawing of the clamping slide in the first embodiment of the present utility model;

[0029] Figure 12 This is the cross-sectional view of the second embodiment of the present utility model.

[0030] Explanation of reference numerals:

[0031] 1. Frame;

[0032] 11. Guide rail; 12. Lower seat body; 13. Upper seat body; 14. Stroke limiting member; 15. Reset member;

[0033] 131. Laser incident opening;

[0034] 2. Cantilever beam;

[0035] 21. Welding top surface; 22. Clamping side surface; 23. Ceramic part; 24. Positioning part;

[0036] 241. First pushing part;

[0037] 3. Clamping slide;

[0038] 31. Top clamp; 32. U-shaped seat;

[0039] 311. First pressing part; 312. Second pressing part; 313. Welding gap;

[0040] 4. Side wall clamp;

[0041] 51. Top driving part; 52. Side wall driving part;

[0042] 511. Top pushing block;

[0043] 6. Support part;

[0044] 7. Pushing component;

[0045] 71. First driving part; 72. First slide; 73. Second driving part; 74. Second slide;

[0046] 741. Second pushing part;

[0047] 8. Welding head;

[0048] 9. Battery housing;

[0049] 91. Side plate; 92. Splicing part; 93. Weld seam. Detailed implementation manners

[0050] To enable those skilled in the art to better understand the present utility model and thus more clearly define the scope of protection required by the present utility model, the present utility model will be described in detail below with respect to certain specific embodiments of the present utility model. It should be noted that the following are only some specific implementation manners of the concept of the present utility model and are only a part of the embodiments of the present utility model. The specific and direct descriptions of the relevant structures are only for the convenience of understanding the present utility model, and each specific feature does not of course and directly limit the scope of implementation of the present utility model. Conventional selections and substitutions made by those skilled in the art under the guidance of the concept of the present utility model shall be regarded as being within the scope of protection required by the present utility model.

[0051] Embodiment 1:

[0052] As Figures 1 - 11 shown, the present utility model discloses a clamping device for a thin-walled battery case, which is used to clamp the battery case 9. The battery case 9 is formed by bending a thin-walled metal plate and is integrally rectangular. Among them, the battery case 9 includes side plates 91 on the front and rear sides and splicing parts 92 bent relative to the side plates 91 above each side plate 91. There is a weld 93 between the splicing parts 92 to connect the two splicing parts 92 by welding at the weld 93.

[0053] Specifically, the clamping device includes:

[0054] A frame 1, on which a guiding slide rail 11 is provided, and the track direction of the guiding slide rail 11 is arranged vertically;

[0055] A cantilever beam 2, the length direction of the cantilever beam 2 is along the left-right direction, and the left end of the cantilever beam 2 is fixedly installed on the frame 1 by means of bolts, integral molding, etc., while the right end is suspended, so that the battery case 9 can be sleeved into the cantilever beam 2 from the right end. Among them, a welding top surface 21 is provided on the upper side of the cantilever beam 2, and clamping side surfaces 22 are provided on the front and rear sides;

[0056] A clamping assembly, which is used to press the side plate 91 of the battery case 9 against the clamping side surface 22, and the clamping assembly is used to press the two splicing parts 92 of the battery case 9 against the welding top surface 21;

[0057] Specifically, the clamping assembly includes a clamping slide 3, side wall clamps 4, a top driving member 51, and a side wall driving member 52. The clamping slide 3 is fitted to the guiding slide rail 11 to achieve vertical sliding. Among them, the clamping slide 3 is provided with a first pressing portion 311 and a second pressing portion 312. The length directions of the first pressing portion 311 and the second pressing portion 312 are both along the left-right direction to correspond to the length direction of the cantilever beam 2. In addition, a welding gap 313 is provided between the first pressing portion 311 and the second pressing portion 312; the side wall clamps 4 are arranged on the cantilever beam 2, and the number of the side wall clamps 4 is two groups, and they are respectively located on both sides of the cantilever beam 2; the top driving member 51 is used to drive the clamping slide 3 to move so as to slide and drive the first pressing portion 311 and the second pressing portion 312 to approach or move away from the welding top surface 21 synchronously; the side wall driving member 52 is used to drive the side wall clamps 4 to approach or move away from the clamping side surface 22.

[0058] Therefore, 1. The battery case 9 to be welded is sleeved into the cantilever beam 2 from the right side. After being sleeved in place, the side wall driving member 52 works to make the side wall clamps 4 on the front and back sides move towards the cantilever beam 2 to press the side plates 91 of the battery case 9 against the clamping side surface 22, so that the splicing portion 92 of the battery case 9 approaches to narrow the weld seam 93. Then, the top driving member 51 works to make the clamping slide 3 move downward under the guiding action of the guiding slide rail 11, so that the splicing portion 92 connected to the front side plate 91 is pressed against the welding top surface 21 under the action of the downward movement of the first pressing portion 311, and the splicing portion 92 connected to the rear side plate 91 is pressed against the welding top surface 21 under the action of the downward movement of the second pressing portion 312, so that the weld seam 93 reaches the minimum state. Then, welding can be carried out in the clamped state, and the high-precision welding requirement that the width of the weld seam 93 is greater than 0.3 mm and less than or equal to 0.7 mm can be achieved. 2. The work of the top driving member 51 makes the first pressing portion 311 and the second pressing portion 312 move synchronously with the clamping slide 3, and the guiding slide rail 11 guides the clamping slide 3, so that the first pressing portion 311 and the second pressing portion 312 act downward on the two splicing portions 92 of the battery case 9, and the two splicing portions 92 are more evenly stressed to achieve accurate alignment and ensure the welding quality.

[0059] It should be noted that this clamping device is only used for clamping the battery case 9, and it is not specifically applied to clamping the battery case 9 in a welding environment.

[0060] In other embodiments, the side wall clamps 4 and the side wall driving member 52 are installed on the frame 1, so that the position where the side wall clamps 4 abut against the side plates 91 does not change with the sliding of the clamping slide 3.

[0061] Specifically, the number of side wall clamps 4 and side wall driving members 52 is 4 each, and two of them form a group. The two groups of side wall clamps 4 and side wall driving members 52 are respectively located on the front and rear sides of the cantilever beam 2 and are arranged left and right. Each side wall driving member 52 is fixedly installed under the clamping sliding seat 3 by means of bolts, and the side wall clamp 4 is arranged on the output shaft of the side wall driving member 52 and faces the cantilever beam 2, so that the output shaft of the side wall driving member 52 drives the side wall clamp 4 to move towards the cantilever beam 2 and act on the side plate 91 to achieve clamping.

[0062] In addition, an internal groove is provided on the welding top surface 21 in this embodiment, and a ceramic part 23 is arranged in the internal groove by means of snap connection, bolts, bonding, etc. Among them, the upper surface of the ceramic part 23 and the welding top surface 21 are coplanar.

[0063] Therefore, the ceramic part 23 that is not easily adhered to the solder is arranged on the welding top surface 21, so that the upper surface of the ceramic part 23 and the welding top surface 21 are combined to comprehensively support the two splicing parts 92. Welding can minimize the weld seam 93 under the condition that the splicing parts 92 are effectively flush, further improving the welding quality. In addition, the welding top surface 21 made of metal material has higher bearing pressure strength. Therefore, the pressure exerted by the first pressing part 311 and the second pressing part 312 on the welding top surface 21 is mainly supported by the first pressing part 311 and the second pressing part 312, preventing all the pressure from acting on the ceramic part 23 and causing the ceramic part 23 to be fractured and damaged.

[0064] In other embodiments, a ceramic part 23 is arranged on the upper side of the cantilever beam 2, and the welding top surface 21 is the upper surface of the ceramic part 23.

[0065] Preferably, the ceramic part 23 adopts a silicon carbide SC200 ceramic plate.

[0066] In addition, a support member 6 is arranged on the frame 1 in this embodiment. The support member 6 is located below the cantilever beam 2 near the suspended end. The support member 6 works to support the cantilever beam 2 by abutting upwards or releases the support for the cantilever beam 2 by moving downwards.

[0067] Therefore, when the battery case 9 has not been sleeved into the cantilever beam 2, the support member 6 does not abut against the cantilever beam 2, so that the battery case 9 can be sleeved into the cantilever beam 2. After the battery case 9 is sleeved in place, the support member 6 works to abut upwards against the cantilever beam 2, so as to support the suspended end of the cantilever beam 2 and reduce the deflection of the cantilever beam 2 to improve the welding quality. In addition, after welding is completed, the support member 6 moves downwards to release the support for the cantilever beam 2, so that the battery case 9 can be taken out conveniently.

[0068] Specifically, the support member 6 is a cylinder, and the support member 6 is fixedly installed on the frame 1 by bolts. The output shaft of the support member 6 faces upward and can extend upward and insert into the cantilever beam 2 to support the cantilever beam 2 upward, or can be withdrawn downward from the cantilever beam 2 to release the support.

[0069] In addition, a top fixture 31 is detachably provided at the lower end of the clamping slide 3 in the present embodiment by bolts. The top fixture 31 is integrally square-ring-shaped, and the first pressing portion 311 and the second pressing portion 312 are integrally formed on the inner peripheral wall of the top fixture 31. Therefore, the first pressing portion 311 and the second pressing portion 312 are integral parts, so that after the top fixture 31 is installed on the clamping slide 3, the installation of the first pressing portion 311 and the second pressing portion 312 can be completed synchronously. Not only is the installation more convenient, but also the relative positioning of the first pressing portion 311 and the second pressing portion 312 is accurate, and the relative position between the two will not change due to installation errors and affect the welding gap 313. In addition, the top fixture 31 can be replaced according to different requirements of the weld 93, and the adaptability is stronger.

[0070] Preferably, both the first pressing portion 311 and the second pressing portion 312 are gradually reduced in thickness as they approach each other, so that the height of the welding gap 313 is smaller and the welding is more stable.

[0071] Specifically, the frame 1 includes a lower seat body 12 and an upper seat body 13. The lower seat body 12 and the upper seat body 13 are connected by four guide rails 11. The top driving member 51 is fixedly installed on the lower side of the upper seat body 13 by bolts. The number of the top driving members 51 is 4, and a top push block 511 is provided at the lower end of the output shaft of the top driving member 51, so that the output shaft of the top driving member 51 drives the top push block 511 to move downward and act on the clamping slide 3 downward. In addition, a reset member 15 is provided between the lower seat body 12 and the clamping slide 3, and the reset member 15 is used to reset the clamping slide 3 upward.

[0072] Therefore, the top driving member 51 pushes the clamping slide 3 downward above the clamping slide 3, making the driving more stable. The reset member 15 automatically resets the clamping slide 3 upward after the driving force of the top driving member 51 is removed, so that the clamping slide 3 quickly disengages from the battery case 9 and remains stable, ensuring the safety of the battery case 9 when it is sleeved on the cantilever beam 2 and removed from the cantilever beam 2.

[0073] Preferably, the guide rails 11 are 4 columns, the reset member 15 is a compression spring, and the number is 4, so that the compression spring is sleeved on the guide rails 11 to prevent the compression spring from becoming unstable and falling off.

[0074] In addition, U-shaped seats 32 are respectively arranged on the left and right sides of the lower side of the clamping slide 3 in this embodiment. The U-shaped opening of the U-shaped seat 32 faces downward and is sleeved on the outer periphery of the cantilever beam 2. The distance between the U-shaped seat 32 and the cantilever beam 2 is slightly larger than the wall thickness of the battery housing 9, so that the U-shaped seat 32 has a limiting effect on the cantilever beam 2 in the front-back direction, preventing the front-back position deviation of the cantilever beam 2 from being too large, resulting in too large alignment errors of the welding gap 313 and the weld 93 and affecting the welding quality.

[0075] In addition, a stroke limiting member 14 is fixedly installed on the frame 1 by bolts. The upper end of the stroke limiting member 14 is hook-shaped and is limited above the clamping slide 3, so as to limit the clamping slide 3 upward, preventing the clamping slide 3 from being overly reset upward under the reset action of the reset member 15, increasing the working stroke and affecting the processing efficiency.

[0076] In other embodiments, the stroke limiting member 14 can also limit the downward stroke of the clamping slide 3 to prevent the clamping slide 3 from moving overly downward and causing collisions between components.

[0077] In addition, a positioning member 24 is arranged at the left end of the cantilever beam 2, and a pushing assembly 7 is arranged on the clamping slide 3. Among them, the pushing assembly 7 is used to push the battery housing 9 sleeved on the cantilever beam 2 toward the positioning member 24 to realize the clamping and positioning of the battery housing 9.

[0078] Therefore, through the arrangement of the positioning member 24 and the pushing assembly 7, the battery housing 9 is more accurately positioned in the left-right direction, thereby improving the welding quality.

[0079] Specifically, the pushing assembly 7 includes a first driving member 71, a first sliding seat 72, a second driving member 73, and a second sliding seat 74. The first driving member 71 is fixedly installed on the cantilever beam 2 by bolts, and the first sliding seat 72 is fixedly installed on the output shaft of the first driving member 71 by threaded connection and can move left and right along with the output shaft of the first driving member 71. The second driving member 73 is fixedly installed on the first sliding seat 72 by bolts, and the second sliding seat 74 is fixedly installed on the output shaft of the second driving member 73 by threaded connection and can move up and down along with the output shaft of the second driving member 73. Among them, the second sliding seat 74 faces downward and is close to the welding top surface 21, and faces upward and is away from the welding top surface 21.

[0080] Therefore, after the battery housing 9 is preliminarily sleeved on the cantilever cross beam 2, the second driving member 73 drives the second sliding seat 74 to move downward to approach the welding top surface 21, and the distance between the lower end of the second sliding seat 74 and the welding top surface 21 is less than the thickness of the battery housing 9. Then, the first driving member 71 drives the first sliding seat 72 to move leftward so that the second sliding seat 74 moves leftward together and pushes the battery housing 9 at the same time. When the battery housing 9 abuts against the positioning member 24 to the left, the clamping and fixing can be completed. In the clamped and fixed state, the battery housing 9 is not likely to move left and right, ensuring the stability of welding.

[0081] Preferably, two separated first pushing portions 241 are provided at the rightward end of the positioning member 24, and two separated second pushing portions 741 are provided at the leftward end of the second sliding seat 74, so that the first pushing portions 241 and the second pushing portions 741 respectively abut against the splicing portion 92, and the gaps between the first pushing portions 241, the gaps between the second pushing portions 741 and the welding gap 313 correspond. Thus, during the process of fully welding the weld seam 93, the solder cannot contact the positioning member 24 and the second sliding seat 74, preventing the positioning member 24, the second sliding seat 74 and the battery housing 9 from being welded.

[0082] In other embodiments, the pushing assembly 7 is arranged on the lower seat body 12; or the number of the pushing assemblies 7 is two groups, one group is arranged on the clamping sliding seat 3, and the other group is arranged on the lower seat body 12.

[0083] Specifically, the top driving member 51, the side wall driving member 52, the first driving member 71 and the second driving member 73 all adopt air cylinders.

[0084] Embodiment 2:

[0085] As Figure 12 shown, the present utility model discloses a welding device for a thin-walled battery housing, which includes a welding machine and the thin-walled battery housing clamping device described in Embodiment 1. Specifically, the upper seat body 13 is provided with a long-strip-shaped laser injection opening 131 extending left and right, the welding machine adopts a laser welding machine, and the welding head 8 of the laser welding machine is located above the laser injection opening 131.

[0086] Therefore, the welding head 8 injects laser downward above the laser injection opening, the laser enters the welding gap 313 and then releases the weld seam 93 between the two splicing portions 92, and then gradually welds the weld seam 93 in the left-right direction to complete the processing.

[0087] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping device for a thin-walled battery housing, characterized in that, Comprising: A frame (1); A cantilever beam (2), one end of the length of the cantilever beam (2) is fixedly installed on the frame (1), and the other end of the length is suspended. The cantilever beam (2) is provided with a welding top surface (21) and clamping side surfaces (22) located on both sides of the welding top surface (21); A clamping assembly for pressing the side plate (91) of the battery housing (9) against the clamping side surface (22), and / or the clamping assembly for pressing the two splicing parts (92) of the battery housing (9) against the welding top surface (21); A ceramic part (23) provided on the upper side of the cantilever beam (2); In the state where the clamping assembly clamps the battery housing (9), the weld seam (93) between the two splicing parts (92) on the battery housing (9) is located above the ceramic part (23).

2. The thin-walled battery housing clamping device according to claim 1, wherein: A guiding slide rail (11) is provided on the frame (1); The clamping assembly includes a clamping slide base (3), side wall clamps (4), a top driving member (51), and a side wall driving member (52); The clamping slide base (3) is provided with a first pressing part (311) and a second pressing part (312). A welding gap (313) is provided between the first pressing part (311) and the second pressing part (312). The clamping slide base (3) is fitted to the guiding slide rail (11); The side wall clamps (4) are provided on the frame (1) and / or the cantilever beam (2). The number of the side wall clamps (4) is two groups and are respectively located on both sides of the cantilever beam (2); The top driving member (51) is used to drive the clamping slide base (3) to move so as to slide and drive the first pressing part (311) and the second pressing part (312) to approach or move away from the welding top surface (21) synchronously; The side wall driving member (52) is used to drive the side wall clamps (4) to approach or move away from the clamping side surface (22).

3. The thin-walled battery case clamping device according to claim 1, characterized in that: A support member (6) is provided on the frame (1). The support member (6) is located below the cantilever beam (2) near the suspended end. The support member (6) works to support the cantilever beam (2) by abutting against it upward or releases the support for the cantilever beam (2) downward.

4. The thin-walled battery housing clamping device according to claim 2, characterized in that: A top clamp (31) is detachably provided on the clamping slide base (3). The top clamp (31) is annularly arranged. The first pressing part (311) and the second pressing part (312) are integrally formed on the inner peripheral wall of the top clamp (31).

5. The thin-walled battery housing clamping device according to claim 2, characterized in that: The frame (1) includes a lower seat body (12) and an upper seat body (13). The lower seat body (12) and the upper seat body (13) are connected by a plurality of guiding slide rails (11). The top driving member (51) is provided on the upper seat body (13) and drives the clamping slide base (3) downward. A reset member (15) is provided between the lower seat body (12) and the clamping slide base (3). The reset member (15) is used to reset the clamping slide base (3) upward.

6. The thin-walled battery case clamping device according to claim 5, wherein: A stroke limiting member (14) is provided on the frame (1). The stroke limiting member (14) is located on the upward and / or downward movement trajectories of the clamping slide base (3).

7. The thin-walled battery housing clamping device according to claim 2, wherein: The cantilever beam (2) is provided with a positioning member (24) at one end fixed to the frame (1), and a pushing assembly (7) is provided on the frame (1) and / or the clamping slide (3). The pushing assembly (7) is used to push the battery housing (9) sleeved on the cantilever beam (2) towards the positioning member (24) to achieve clamping and positioning of the battery housing (9).

8. The thin-walled battery case clamping device according to claim 7, characterized in that: The pushing assembly (7) includes a first driving member (71), a first slide (72), a second driving member (73), and a second slide (74). The first driving member (71) is used to drive the first slide (72) to slide along the length direction of the cantilever beam (2). The second driving member (73) is arranged on the first slide (72), and the second driving member (73) is used to drive the second slide (74) to approach or move away from the cantilever beam (2).

9. The thin-walled battery housing clamping device according to claim 1, wherein: An internal groove is provided on the welding top surface (21), the ceramic member (23) is arranged in the internal groove, and the upper surface of the ceramic member (23) and the welding top surface (21) are coplanar; or, the welding top surface (21) is the upper surface of the ceramic member (23); preferably, the ceramic member (23) is made of silicon carbide SC200 ceramic plate.

10. A welding device for a thin-walled battery housing, characterized in that: It includes a welding machine and the thin-walled battery housing clamping device according to any one of claims 1-9; A laser injection opening (131) is provided above the frame (1). The welding machine is a laser welding machine, and the welding head (8) of the laser welding machine is located above the laser injection opening (131).

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