Battery cell shell material welding clamp

Abstract

The utility model relates to the technical field of shell material welding clamps, and discloses a battery core shell material welding clamp which comprises a first clamping structure, a second clamping structure, a base, a shell fixing plate and a jacking structure, the shell fixing plate and the base form a shell containing cavity, and the shell containing cavity is used for containing a shell material; the first clamping and fixing structure comprises a first clamping and fixing plate, the first clamping and fixing plate moves towards or away from the fixed shell plate under driving force, the second clamping and fixing structure comprises a second clamping and fixing plate, the second clamping and fixing plate moves towards or away from the fixed shell plate under driving force, and the fixed shell plate, the first clamping and fixing plate and the second clamping and fixing plate position the shell material along the periphery; the jacking structure comprises a jacking plate which is used for applying downward pressure to the shell material. The positioning steps of the shell material are simplified, the shell material is conveniently positioned, meanwhile, the stress of the shell material is more uniform, the positioning effect of the shell material is improved, the bottom shell plate is positioned through the top pressing plate, the welding effect of the bottom shell plate and the main shell is improved, and the qualification rate of the shell material is guaranteed.

Description

Technical Field

[0001] This utility model patent relates to the technical field of shell welding fixtures, and more specifically, to battery cell shell welding fixtures. Background Technology

[0002] The battery cell includes the casing, and common casings include square casings and cylindrical casings. During the production process, the casing plates need to be welded together to form the casing. First, the main casing is welded together, and then the bottom casing plate is welded to the main casing. During welding, the main casing needs to be fixed to meet the requirements of subsequent welding operations.

[0003] To facilitate the welding of the casing, a clamp is used for auxiliary fixing. For example, the prior patent with authorization number CN221658255U discloses a pre-welding fixture for battery cells, including: a first support plate with two first slots, the two first slots being respectively disposed at the connection points between the two top covers and the casing; a first clamping mechanism disposed on the first support plate, the first clamping mechanism being configured to clamp the battery cell along a first direction; a second clamping mechanism disposed on the first support plate, the second clamping mechanism being configured to clamp the battery cell along a second direction, the second direction being perpendicular to the first direction; and limiting members disposed at both ends of the first clamping mechanism abutting against the side wall of the battery cell, and protruding along the first direction from the first clamping mechanism abutting against the side wall of the battery cell.

[0004] In the existing technology, the fixture positions the shell material through clamping mechanisms in four directions. The operation and positioning steps are complicated and inconvenient for positioning the shell material. At the same time, applying positioning forces in four directions can easily cause the shell material to shake and deform, affecting the qualification rate of the welded finished product. Utility Model Content

[0005] The purpose of this invention is to provide a welding fixture for battery cell casings, which aims to solve the problem that the fixtures in the prior art are not convenient for positioning the casings.

[0006] This utility model is implemented as follows: a battery cell casing welding fixture includes a first clamping structure, a second clamping structure, a base, a casing plate, and a top-pressing structure. The first clamping structure, the second clamping structure, the top-pressing structure, and the casing plate are respectively installed on the base. The casing plate and the base form a casing placement cavity, which is used to place the casing material. The first clamping structure includes a first clamping plate, which moves in a direction toward or away from the casing plate under a driving force. The second clamping structure includes a second clamping plate, which moves in a direction toward or away from the casing plate under a driving force. The casing plate, the first clamping plate, and the second clamping plate position the casing material around the perimeter. The top-pressing structure includes a top-pressing plate, which is used to apply downward pressure to the casing material.

[0007] Furthermore, the fixed shell plate includes a front plate body, which is arranged at intervals with the first clamping plate. The front plate body and the first clamping plate are used to clamp and position the front and back of the shell material. When positioned, the front plate body and the first clamping plate are respectively arranged to lie flat and abut against the shell material, and the cross-sectional area of ​​the front plate body and the cross-sectional area of ​​the first clamping plate are respectively larger than the cross-sectional areas of the front and back of the shell material.

[0008] Furthermore, the fixed shell plate includes a side plate, the front plate and the side plate are arranged perpendicularly to each other, the side plate and the second clamping plate are arranged at intervals, the side plate and the second clamping plate are used to clamp and position the two sides of the shell material, when positioning, the side plate and the second clamping plate are respectively arranged to lay flat and abut against the shell material, and the cross-section of the side plate and the cross-section of the second clamping plate are respectively larger than the cross-sectional area of ​​the side of the shell material.

[0009] Furthermore, the positive plate body has a plurality of positive plate holes arranged in a through manner; the battery cell shell welding fixture includes an adsorber, which is used to assemble with the positive plate body and to apply an adsorption force to the shell placement cavity through the positive plate holes.

[0010] Furthermore, the side plate body has multiple side plate holes arranged in a through manner; the battery cell shell welding fixture includes an adsorber, which is used to assemble with the side plate body and to apply an adsorption force to the shell placement cavity through the side plate holes.

[0011] Furthermore, the first clamping structure includes a first cylinder, a transverse plate, and a longitudinal plate. The outer end of the transverse plate is aligned with the first cylinder, which applies a driving force. The inner end of the transverse plate is aligned with the lower part of the longitudinal plate, and the longitudinal plate and the first clamping plate are stacked together. The base is provided with multiple positive guide rails, which are arranged at intervals along the length of the transverse plate. The transverse plate and the positive guide rails are assembled vertically. The first cylinder drives the transverse plate to move relative to the positive guide rails.

[0012] Furthermore, the second clamping structure includes a second cylinder, a side transverse plate, and a side longitudinal plate. The outer end of the side transverse plate is aligned with the second cylinder. The first cylinder is used to apply driving force. The inner end of the side transverse plate is aligned with the lower part of the side longitudinal plate. The side longitudinal plate and the second clamping plate are stacked together. The base is provided with a side guide rail. The side transverse plate and the side guide rail are assembled vertically. The second cylinder is used to drive the side transverse plate to move relative to the side guide rail.

[0013] Furthermore, the top-pressing structure includes multiple rotary pressing cylinders and multiple plate connecting rods. The rotary pressing cylinders are used to apply radial or axial forces. Each rotary pressing cylinder is arranged at intervals along the length of the top-pressing plate. The rotary pressing cylinders are arranged to start synchronously. Each rotary pressing cylinder and each plate connecting rod are arranged in a one-to-one correspondence. The inner end of the plate connecting rod is connected to the rotary pressing cylinder, and the outer end of the plate connecting rod is used to apply downward pressure to the top-pressing plate.

[0014] Furthermore, the top pressure plate includes a main pressure plate and multiple support groups. Each support group is arranged at intervals along the length of the main pressure plate, and each support group is arranged in a one-to-one correspondence with the outer end of each plate connecting rod. Each support group includes two support blocks, the main pressure plate is located between the two support blocks, and the two support blocks are respectively connected to the main pressure plate. The two support blocks and the main pressure plate are used to synchronously support the top pressure plate.

[0015] Furthermore, the base includes a bottom plate for supporting the shell material. The bottom plate has multiple bottom holes arranged in a through manner. The battery cell shell welding fixture includes an adsorber, which is assembled with the bottom plate and is used to apply adsorption force to the shell cavity through the bottom holes.

[0016] Compared with existing technologies, the battery cell casing welding fixture provided by this utility model, during welding operations, involves loading the main casing into the casing placement cavity, positioning two sides of the main casing using a fixed casing plate, and then driving the first and second clamping plates to move and contact the main casing, thereby positioning all four sides of the main casing. Next, the bottom casing plate is loaded until it is in vertical contact with the main casing. The bottom casing plate is then positioned by a top pressure plate, and spot welding is performed first. After initial fixing, the top pressure plate is driven to swing away from the bottom casing plate, and then full welding is performed to complete the casing welding operation. In this way, with the coordinated action of the fixed casing plate, the first clamping plate, and the second clamping plate, the main casing does not need to bear driving and positioning forces in four directions, simplifying the casing positioning steps and facilitating casing positioning. Simultaneously, it makes the stress on the casing more uniform, improving the positioning effect. Furthermore, the top pressure plate positions the bottom casing plate, improving the welding effect between the bottom casing plate and the main casing and ensuring the casing's pass rate. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the battery cell shell welding fixture provided by this utility model;

[0018] Figure 2 This is a top view schematic diagram of the battery cell shell welding fixture provided by this utility model;

[0019] Figure 3This is a three-dimensional schematic diagram of the battery cell shell welding fixture provided by this utility model;

[0020] Figure 4 This is a three-dimensional schematic diagram of the top pressure structure of the battery cell shell welding fixture provided by this utility model;

[0021] Figure 5 This is a three-dimensional schematic diagram of the first clamping structure of the battery cell shell welding fixture provided by this utility model;

[0022] Figure 6 This is a three-dimensional schematic diagram of the second clamping structure of the battery cell shell welding fixture provided by this utility model;

[0023] Figure 7 This is a partially enlarged schematic diagram of the battery cell casing welding fixture provided by this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Reference Figure 1-7 The image shown is a preferred embodiment of the present invention.

[0028] A battery cell casing welding fixture includes a first clamping structure 1, a second clamping structure 2, a base 3, a casing plate 4, and a top-pressing structure 5. The first clamping structure 1, the second clamping structure 2, the top-pressing structure 5, and the casing plate 4 are respectively installed on the base 3. The casing plate 4 and the base 3 form a casing placement cavity for placing the casing material 6. The first clamping structure 1 includes a first clamping plate 11, which moves towards or away from the casing plate 4 under a driving force. The second clamping structure 2 includes a second clamping plate 21, which moves towards or away from the casing plate 4 under a driving force. The casing plate 4, the first clamping plate 11, and the second clamping plate 21 position the casing material 6 around the perimeter. The top-pressing structure 5 includes a top-pressing plate 53, which applies downward pressure to the casing material 6.

[0029] In the aforementioned battery cell casing welding fixture, during welding operations, the main casing 61 is loaded into the casing placement cavity. The two sides of the main casing 61 are positioned by the fixed casing plate 4. Then, the first clamping plate 11 and the second clamping plate 21 are driven to move and contact the main casing 61, thus positioning all four sides of the main casing 61. Next, the bottom casing plate 62 is loaded until it is in vertical contact with the main casing 61. The bottom casing plate 62 is then positioned by the top pressure plate 53. Spot welding is performed first for initial fixation. After this initial fixation, the top pressure plate 53 is driven to swing and disengage. The bottom shell plate 62 is then fully welded to complete the welding operation of the shell material 6. In this way, with the cooperation of the fixed shell plate 4, the first clamping plate 11 and the second clamping plate 21, the main shell 61 does not need to bear the driving positioning force in four directions, which simplifies the positioning steps of the shell material 6 and makes it easier to position the shell material 6. At the same time, it makes the force on the shell material 6 more uniform and improves the positioning effect of the shell material 6. In addition, the top pressure plate 53 positions the bottom shell plate 62, improves the welding effect between the bottom shell plate 62 and the main shell 61, and ensures the qualification rate of the shell material 6.

[0030] Shell material 6 includes main shell 61 and bottom shell, and welding is used to directly assemble the main shell 61 and bottom shell.

[0031] Welding methods can include laser welding, electric welding, etc.

[0032] The main shell 61 has a shell platform, which is used to support the bottom shell and facilitates the loading of the bottom shell into the main shell 61; at the same time, the bottom shell and the main shell 61 are embedded in each other, and the shell platform plays a positioning role in loading the bottom shell.

[0033] The shell plate 4 includes a front plate 41, which is arranged in a corresponding manner with the first clamping plate 11 at intervals. The front plate 41 and the first clamping plate 11 are used to clamp the front and back of the shell material 6. When positioned, the front plate 41 and the first clamping plate 11 are arranged to lie flat and abut against the shell material 6, and the cross-sectional area of ​​the front plate 41 and the cross-sectional area of ​​the first clamping plate 11 are larger than the cross-sectional areas of the front and back of the shell material 6, respectively.

[0034] In this way, with the cooperation of the positive plate 41 and the first clamping plate 11, the front and back of the main shell 61 are positioned, and the main shell 61 is driven on only one side, avoiding uneven force on the two sides, improving the positioning effect of the main shell 61, effectively protecting the main shell 61 and reducing the risk of deformation of the main shell 61.

[0035] The fixed shell plate 4 includes a side plate 42, a front plate 41 and a side plate 42 arranged perpendicularly to each other, and a second clamping plate 21 arranged at intervals. The side plate 42 and the second clamping plate 21 are used to clamp the two sides of the positioning shell material 6. When positioning, the side plate 42 and the second clamping plate 21 are arranged to lie flat against the shell material 6, and the cross-section of the side plate 42 and the cross-section of the second clamping plate 21 are larger than the cross-sectional area of ​​the side of the shell material 6.

[0036] In this way, with the cooperation of the side plate 42 and the second clamping plate 21, the two sides of the main shell 61 are positioned, and only one side of the main shell 61 is driven, avoiding uneven force on the two sides, improving the positioning effect of the main shell 61, effectively protecting the main shell 61, and reducing the risk of deformation of the main shell 61.

[0037] Furthermore, the front plate 41 and the side plate 42 are arranged perpendicularly to each other. When the main shell 61 is loaded, the front plate 41 and the side plate 42 perform initial positioning on the loading of the main shell 61, thereby improving the loading accuracy of the main shell 61.

[0038] The positive plate body 41 has a plurality of positive plate holes 43 arranged in a through manner; the battery cell shell welding fixture includes an adsorber, which is used to assemble with the positive plate body 41 and to apply adsorption force to the shell placement cavity through the positive plate holes 43.

[0039] In this way, after the main shell 61 is loaded, the adsorption force is applied by the adsorption device to adsorb the shell material 6, so that the back or front side of the shell material 6 is arranged in close contact with the front plate 41, thereby improving the positioning effect of the shell material 6.

[0040] Alternatively, after the main shell 61 is loaded, and the first clamping plate 11 and the second clamping plate 21 are moved into place, the adsorber is restarted to apply adsorption force; the positioning of the shell 6 is reinforced to improve the positioning stability of the shell 6 and ensure the subsequent welding effect.

[0041] The adsorber generates negative pressure, which vacuum-adheres the front or back of the main shell 61 to the positive plate 41.

[0042] The side plate body 42 has multiple side plate holes arranged in a through manner; the battery cell shell welding fixture includes an adsorber, which is used to assemble with the side plate body 42 and to apply adsorption force to the shell cavity through the side plate holes.

[0043] In this way, after the main shell 61 is loaded, the adsorption force is applied by the adsorption device to adsorb the shell material 6, so that the side of the shell material 6 is arranged in close contact with the side plate 42, thereby improving the positioning effect of the shell material 6.

[0044] The adsorber generates negative pressure, which vacuum-adheres the side of the main shell 61 to the side plate 42.

[0045] The first clamping structure 1 includes a first cylinder 12, a transverse plate 13, and a longitudinal plate 14. The outer end of the transverse plate 13 is connected to the first cylinder 12, which is used to apply driving force. The inner end of the transverse plate 13 is connected to the lower part of the longitudinal plate 14, and the longitudinal plate 14 and the first clamping plate 11 are stacked together. The base 3 is provided with multiple positive guide rails, which are arranged at intervals along the length of the transverse plate 13. The transverse plate 13 and the positive guide rails are assembled vertically. The first cylinder 12 is used to drive the transverse plate 13 to move relative to the positive guide rails.

[0046] In this way, after the shell material 6 is fed, the first cylinder 12 is activated to push the transverse plate 13 to move toward the shell material 6, which in turn drives the longitudinal plate 14 to move toward the shell material 6. The longitudinal plate 14 then drives the first clamping plate 11 to move toward the shell material 6 until the first clamping plate 11 and the main plate 41 cooperate to position the shell material 6, thereby achieving automated positioning of the shell material 6.

[0047] Furthermore, the positive guide rail prevents the first clamping plate 11 from shifting, ensuring the accuracy of its movement.

[0048] The second clamping structure 2 includes a second cylinder 22, a side horizontal plate 23, and a side vertical plate 24. The outer end of the side horizontal plate 23 is connected to the second cylinder 22. The first cylinder 12 is used to apply driving force. The inner end of the side horizontal plate 23 is connected to the lower part of the side vertical plate 24. The side vertical plate 24 and the second clamping plate 21 are stacked and fixed. The base 3 is provided with a side guide rail. The side horizontal plate 23 and the side guide rail are assembled vertically. The second cylinder 22 is used to drive the side horizontal plate 23 to move relative to the side guide rail.

[0049] In this way, after the shell material 6 is fed, the second cylinder 22 is activated to push the side shift plate to move toward the shell material 6, which in turn drives the side longitudinal plate 24 to move toward the shell material 6. The side longitudinal plate 24 drives the second clamping plate 21 to move toward the shell material 6 until the second clamping plate 21 and the side plate body 42 cooperate to position the shell material 6, thereby realizing the automated positioning of the shell material 6.

[0050] Furthermore, the side guide rail prevents the second clamping plate 21 from shifting, ensuring the accuracy of its movement.

[0051] The top pressure structure 5 includes multiple rotary pressing cylinders 51 and multiple plate connecting rods 52. The rotary pressing cylinders 51 are used to apply radial or axial force. Each rotary pressing cylinder 51 is arranged at intervals along the length of the top pressure plate 53. Each rotary pressing cylinder 51 is arranged to start synchronously. Each rotary pressing cylinder 51 is arranged in a one-to-one correspondence with each plate connecting rod 52. The inner end of the plate connecting rod 52 is connected to the rotary pressing cylinder 51. The outer end of the plate connecting rod 52 is used to apply downward pressure to the top pressure plate 53.

[0052] In this way, through the cooperation of each rotating downward pressing cylinder 51, radial or axial force is applied. Under the radial force, the plate connecting rod 52 swings, so that the plate connecting rod 52 swings to contact the top pressing plate 53 or swings away from the top pressing plate 53. Under the axial force, downward pressure is applied to the plate connecting rod 52, thereby applying downward pressure to the top pressing plate 53, improving the fit between the bottom shell plate 62 and the main shell 61, and ensuring the subsequent welding effect.

[0053] The top pressure plate 53 includes a main pressure plate 531 and multiple support groups. Each support group is arranged at intervals along the length of the main pressure plate 531, and each support group is arranged in a one-to-one correspondence with the outer end of each plate connecting rod 52. Each support group includes two support blocks 532. The main pressure plate 531 is located between the two support blocks 532, and the two support blocks 532 are respectively connected to the main pressure plate 531. The two support blocks 532 and the main pressure plate 531 are used to synchronously support the top pressure plate 53.

[0054] In this way, under the action of the main pressure plate 531 and the support group, the force-bearing area of ​​the top pressure plate 53 is increased, and the contact area between the top pressure plate 53 and the plate connecting rod 52 is also increased, which makes it easier for the plate connecting rod 52 to apply downward pressure to the top pressure plate 53 and improve the positioning effect of the shell material 6.

[0055] Furthermore, through the cooperation of each rotating downward pressure cylinder 51 and each plate connecting rod 52, downward pressure is applied simultaneously to multiple positions of the top pressure plate 53, making the stress on the shell material 6 more uniform, effectively preventing the bottom shell plate 62 from warping, improving the fit between the bottom shell plate 62 and the main shell 61, and thus ensuring the subsequent welding effect.

[0056] The base 3 includes a bottom plate for supporting the shell material 6. The bottom plate has multiple bottom holes arranged in a through manner. The battery cell shell welding fixture includes an adsorber, which is assembled with the bottom plate. The adsorber is used to apply adsorption force to the shell cavity through the bottom holes. This improves the stability of the shell material 6 and facilitates the subsequent positioning of the shell material 6 by the first clamping plate 11 and the second clamping plate 21.

[0057] The adsorber generates negative pressure, which vacuum-adheres the shell 6 to the bottom plate.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A welding fixture for battery cell casings, characterized in that, The device includes a first clamping structure, a second clamping structure, a base, a fixed shell plate, and a top-pressing structure. The first clamping structure, the second clamping structure, the top-pressing structure, and the fixed shell plate are respectively installed on the base. The fixed shell plate and the base form a shell-holding cavity for placing the shell material. The first clamping structure includes a first clamping plate, which moves in a direction toward or away from the fixed shell plate under a driving force. The second clamping structure includes a second clamping plate, which moves in a direction toward or away from the fixed shell plate under a driving force. The fixed shell plate, the first clamping plate, and the second clamping plate position the shell material around the perimeter. The top-pressing structure includes a top-pressing plate, which applies downward pressure to the shell material.

2. The cell casing welding fixture as described in claim 1, characterized in that, The fixed shell plate includes a front plate body, which is arranged at intervals with the first clamping plate. The front plate body and the first clamping plate are used to clamp and position the front and back of the shell material. When positioned, the front plate body and the first clamping plate are arranged to lie flat and abut against the shell material, and the cross-sectional area of ​​the front plate body and the cross-sectional area of ​​the first clamping plate are respectively larger than the cross-sectional areas of the front and back of the shell material.

3. The cell casing welding fixture as described in claim 2, characterized in that, The fixed shell plate includes a side plate body, the front plate body and the side plate body are arranged perpendicularly to each other, the side plate body and the second clamping plate are arranged at intervals, the side plate body and the second clamping plate are used to clamp and position the two sides of the shell material. When positioning, the side plate body and the second clamping plate are respectively arranged to lay flat and abut against the shell material, and the cross-section of the side plate body and the cross-section of the second clamping plate are respectively larger than the cross-sectional area of ​​the side of the shell material.

4. The cell casing welding fixture as described in claim 2, characterized in that, The positive plate has multiple positive plate holes arranged in a through manner; the battery cell shell welding fixture includes an adsorber, which is used to assemble with the positive plate and to apply an adsorption force to the shell placement cavity through the positive plate holes.

5. The cell casing welding fixture as described in claim 3, characterized in that, The side plate body has multiple side plate holes arranged in a through manner; the battery cell shell welding fixture includes an adsorber, which is used to assemble with the side plate body and to apply an adsorption force to the shell placement cavity through the side plate holes.

6. The cell casing welding fixture as described in any one of claims 1-5, characterized in that, The first clamping structure includes a first cylinder, a transverse plate, and a longitudinal plate. The outer end of the transverse plate is connected to the first cylinder, which is used to apply driving force. The inner end of the transverse plate is connected to the lower part of the longitudinal plate, and the longitudinal plate and the first clamping plate are stacked together. The base is provided with multiple positive guide rails, which are arranged at intervals along the length of the transverse plate. The transverse plate and the positive guide rails are assembled vertically. The first cylinder is used to drive the transverse plate to move relative to the positive guide rails.

7. The cell casing welding fixture as described in claim 6, characterized in that, The second clamping structure includes a second cylinder, a side horizontal plate, and a side vertical plate. The outer end of the side horizontal plate is aligned with the second cylinder. The first cylinder is used to apply driving force. The inner end of the side horizontal plate is aligned with the lower part of the side vertical plate. The side vertical plate and the second clamping plate are stacked together. The base is provided with a side guide rail. The side horizontal plate and the side guide rail are assembled vertically. The second cylinder is used to drive the side horizontal plate to move relative to the side guide rail.

8. The cell casing welding fixture as described in any one of claims 1-5, characterized in that, The top-pressing structure includes multiple rotary pressing cylinders and multiple plate connecting rods. The rotary pressing cylinders are used to apply radial or axial forces. Each rotary pressing cylinder is arranged at intervals along the length of the top-pressing plate. The rotary pressing cylinders are arranged to start synchronously. Each rotary pressing cylinder and each plate connecting rod are arranged in a one-to-one correspondence. The inner end of the plate connecting rod is connected to the rotary pressing cylinder, and the outer end of the plate connecting rod is used to apply downward pressure to the top-pressing plate.

9. The cell casing welding fixture as described in claim 8, characterized in that, The top pressure plate includes a main pressure plate and multiple support groups. Each support group is arranged at intervals along the length of the main pressure plate, and each support group is arranged in a one-to-one correspondence with the outer end of each plate connecting rod. Each support group includes two support blocks. The main pressure plate is located between the two support blocks, and the two support blocks are respectively connected to the main pressure plate. The two support blocks and the main pressure plate are used to synchronously support the top pressure plate.

10. The cell casing welding fixture as described in any one of claims 1-5, characterized in that, The base includes a bottom plate for supporting the shell material. The bottom plate has multiple bottom holes arranged in a through manner. The battery cell shell welding fixture includes an adsorber, which is assembled with the bottom plate and is used to apply adsorption force to the shell cavity through the bottom holes.

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