Welding auxiliary equipment and battery production line

Abstract

This application discloses a welding auxiliary device and a battery production line. The welding auxiliary device includes a molding die, a top cover, and a clamping component. The weight of the molding die is adjustable. The top cover is disposed on the molding die, and the clamping component is disposed on the side of the molding die and configured to clamp the top cover. The solution provided in this application adjusts the weight of the molding die to match the weight of the actual battery cell. Then, the clamping component fixes the top cover to the upper side of the molding die. When the sealing pin is welded onto the top cover, because the molding die and the battery cell have the same weight, the top cover will not tilt under the support of the molding die. At this time, the sealing pin can be accurately welded onto the top cover, thus avoiding the problem of large fluctuations in the metallographic penetration depth and poor metallographic penetration depth of the sealing pin during the welding process.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a welding auxiliary device and a battery production line. Background Technology

[0002] The welding of sealing nails is crucial for the sealing performance of batteries. The metallographic penetration depth of the sealing nail is an important first-piece and process monitoring indicator in the sealing nail welding process. If the metallographic penetration depth warning or non-compliance is detected, the production line must be stopped for investigation, material tracing, etc., which has a great impact on production capacity and quality.

[0003] In the welding process of the sealing nails in related technologies, the metallographic penetration depth of the sealing nails fluctuates greatly, which cannot accurately characterize the welding penetration state. Utility Model Content

[0004] In view of the above problems, this application provides a welding auxiliary device and a battery production line, which can solve the problem that the metallographic penetration depth of the sealing nail fluctuates greatly during the welding process, and the welding penetration depth cannot be accurately characterized.

[0005] To address the aforementioned technical problems, in a first aspect, this application proposes a welding auxiliary device, comprising:

[0006] A contouring mold, the weight of which is adjustable;

[0007] Top cover, the top cover being disposed on the conforming mold;

[0008] A clamping element is disposed on the side of the mold and configured to clamp the top cover.

[0009] In the technical solution of this application embodiment, the weight of the molding die is adjusted to be the same as the weight of the actual battery cell. Then, the top cover is fixed to the upper side of the molding die using clamping components. When the sealing pin is welded to the top cover, because the molding die and the battery cell have the same weight, the top cover will not tilt under the support of the molding die. At this time, the sealing pin can be accurately welded to the top cover, thus avoiding the problem of large fluctuations in the metallographic penetration depth and poor metallographic penetration depth during the welding process. Simultaneously, because the weight of the molding die is the same as the weight of the actual battery cell, the welding effect of the molding die and the actual battery cell is basically consistent, thereby ensuring that the metallographic penetration depth reflects the true effect of the actual process. Moreover, the clamping components can quickly fix the top cover to the molding die, effectively improving work efficiency.

[0010] In some embodiments, the top cover and the molding die are in a clearance fit. This prevents the top cover from being difficult to insert into the molding die and avoids the impact of particles caused by friction between the top cover and the molding die. At the same time, the clearance fit facilitates the insertion of the top cover onto the molding die or the removal of the top cover from the molding die.

[0011] In some embodiments, the position of the clamping member relative to the molding die along a first direction is adjustable, wherein the first direction is the height direction of the molding die. This facilitates adjustment of the position of the clamping member in the first direction so that the clamping member can clamp the top cover.

[0012] In some embodiments, the clamping member includes a connecting block and a clamp, and the side of the conforming mold is provided with an elongated hole extending along the first direction;

[0013] The clamp is disposed on the connecting block and configured to clamp the top cover. The connecting block is disposed on the side of the mold, and its position relative to the elongated hole is adjustable. Thus, the connecting block is fixed in the elongated hole by bolts. When the position of the connecting block needs to be adjusted, the bolts are loosened, the connecting block is moved along the first direction, and finally fixed with bolts again, thereby achieving the adjustment of the clamp position.

[0014] In some embodiments, the clamp is provided with a protrusion, and the protrusion is provided with a flexible layer;

[0015] When the clamp holds the top cover in place, the flexible layer abuts against the top cover. This prevents excessive pressure from the protrusions on the top cover during clamping, which could cause deformation.

[0016] In some embodiments, the welding aid further includes an elastic component disposed on the bottom surface of the mold. This prevents the bottom surface of the mold from deforming due to excessive pressure during the welding process.

[0017] In some embodiments, the elastic component includes a fixed plate, a connecting plate, a connecting rod, and an elastic element;

[0018] The connecting plate is disposed on the bottom surface of the mold, the connecting rod passes through the fixed plate along the first direction and is connected to the side of the connecting plate opposite to the mold, and the elastic element is disposed between the connecting plate and the fixed plate.

[0019] In some embodiments, the welding auxiliary device further includes a drive member and a cover plate, the drive member being connected to the cover plate and configured to drive the cover plate to move along a first direction;

[0020] When the cover plate moves along the first direction, it can contact the side of the top cover away from the mold. In this way, the drive unit pushes the cover plate down on the top cover along the first direction, ensuring the top cover is horizontal. This guarantees the quality of the weld penetration after welding.

[0021] In some embodiments, the molding die is provided with through holes. This allows excess weight blocks to be removed.

[0022] In some embodiments, the contouring mold includes a plurality of counterweights, with adjacent counterweights being detachably connected. This allows for adjustment of the contouring mold's weight by removing or installing the counterweights.

[0023] Secondly, this application proposes a battery production line, including welding auxiliary devices as described in any one of the embodiments of this application.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of a welding auxiliary device provided in some embodiments of this application;

[0027] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0028] Figure 3 for Figure 1 Top view;

[0029] Figure 4 A schematic diagram of a welding auxiliary device provided in some embodiments of this application from another perspective;

[0030] Figure 5 A schematic diagram of a welding auxiliary device provided in some embodiments of this application from another perspective;

[0031] Figure 6 This is a schematic diagram of another welding auxiliary device provided for some embodiments of this application.

[0032] The reference numerals in the detailed embodiments are as follows:

[0033] 10. Copying mold; 101. Through hole; 102. Elongated hole; 11. Top cover; 12. Clamping component; 121. Connecting block; 122. Fixture; 1221. Protrusion; 13. Elastic component; 131. Fixing plate; 132. Connecting plate; 133. Connecting rod; 134. Elastic component; 14. Driving component; 15. Cover plate; 16. Welding equipment. Detailed Implementation

[0034] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0036] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] The welding of sealing nails is crucial for the sealing performance of batteries. The metallographic penetration depth of the sealing nail is an important first-piece and process monitoring indicator in the sealing nail welding process. If the metallographic penetration depth warning or non-compliance is detected, the production line must be stopped for investigation, material tracing, etc., which has a great impact on production capacity and quality.

[0043] The method for producing the first metallographic sample in the related technology of sealing nail welding production line is as follows: use an empty shell with a welded top cover for sealing nail welding, and then cut it for metallographic measurement of the weld penetration. This method has obvious defects in use, namely, the weight of the empty shell with a welded top cover differs greatly from the actual weight of the battery cell. The empty shell weighs only 300g-400g, while the battery cell weighs 4000g-4500g. When using an empty shell as the first sample, the pressure of the cover plate during welding causes the empty shell to vibrate significantly in the fixture. At the same time, the empty shell is significantly affected by the length of the spring at the bottom of the fixture, and the tilt of the upper surface of the empty shell has a large impact. This leads to large fluctuations in the metallographic weld penetration of the sealing nail, and thus cannot accurately characterize the weld penetration state.

[0044] Based on the above considerations, in order to solve the problem that the metallographic penetration depth of the sealing nail fluctuates greatly during the welding process and cannot accurately characterize the welding penetration state, a welding auxiliary device is designed. The welding auxiliary device includes a molding die, a top cover and a clamping component. The weight of the molding die is adjustable, the top cover is set on the molding die, and the clamping component is set on the side of the molding die. The clamping component is configured to clamp the top cover.

[0045] In the technical solution of this application embodiment, the weight of the molding die is adjusted to be the same as the weight of the actual battery cell. Then, the top cover is fixed to the upper side of the molding die using clamping components. When the sealing pin is welded to the top cover, because the molding die and the battery cell have the same weight, the top cover will not tilt under the support of the molding die. At this time, the sealing pin can be accurately welded to the top cover, thus avoiding the problem of large fluctuations in the metallographic penetration depth and poor metallographic penetration depth during the welding process. Simultaneously, because the weight of the molding die is the same as the weight of the actual battery cell, the welding effect of the molding die and the actual battery cell is basically consistent, thereby ensuring that the metallographic penetration depth reflects the true effect of the actual process. Moreover, the clamping components can quickly fix the top cover to the molding die, effectively improving work efficiency.

[0046] According to some embodiments of this application, Figure 1 This refers to the welding auxiliary device in this application. For example... Figure 1 As shown, this application provides a welding auxiliary device, which includes a molding die 10, a top cover 11 and a clamping member 12. The weight of the molding die 10 is adjustable, the top cover 11 is disposed on the molding die 10, and the clamping member 12 is disposed on the side of the molding die 10 and is configured to clamp the top cover 11.

[0047] The contouring mold 10 in this embodiment may include several weight blocks. Each weight block has a groove and a protrusion on opposite sides. The protrusion on one weight block can be engaged with the groove on another weight block. By adding or removing the number of weight blocks, the weight of the contouring mold 10 can be adjusted so that the weight of the contouring mold 10 is the same as the weight of the corresponding battery cell. Of course, it is understood that the contouring mold 10 can also be made by bonding multiple weight blocks together. The specific method can be determined according to the actual situation, and this embodiment does not limit this.

[0048] This embodiment adjusts the weight of the molding mold 10 so that its weight is suitable for different types of battery cells.

[0049] refer to Figure 1As shown, the clamping component 12 in this embodiment can be a quick clamp, a clip, etc. In this embodiment, a clamping component 12 can be connected to the left and right sides of the mold 10 by bolts. In this embodiment, the number of clamping components 12 on the left and right sides is not limited.

[0050] In use, the weight of the molding die 10 is adjusted to match the weight of the actual battery cell. Then, the top cover 11 is fixed to the upper side of the molding die 10 using the clamping member 12. When the sealing pin is welded to the top cover 11, because the molding die 10 and the battery cell have the same weight, the top cover 11 will not tilt under the support of the molding die 10. This allows the sealing pin to be accurately welded to the top cover 11, avoiding large fluctuations in the metallographic penetration depth and poor metallographic penetration depth during welding. Simultaneously, because the weight of the molding die 10 is the same as the actual battery cell, the welding effect of the molding die 10 and the actual battery cell is essentially consistent, ensuring that the metallographic penetration depth reflects the true effect of the actual process. Furthermore, the clamping member 12 allows for quick fixation of the top cover 11 to the molding die 10, effectively improving work efficiency.

[0051] According to some embodiments of this application, the top cover 11 and the mold 10 are in a clearance fit.

[0052] In this embodiment, the shape of the top cover 11 facing the top surface of the mold 10 is consistent with the shape of the top surface of the mold 10. The top cover 11 facing the top surface of the mold 10 has an overall concave structure, and the inner hole size formed by this concave structure is larger than the size of the mold 10 facing the top cover 11. When the top cover 11 is fastened to the top surface of the mold 10, the top surface of the mold 10 can extend into the corresponding concave structure. In this way, it can prevent the top cover 11 from being difficult to put into the mold 10, and prevent the particle influence caused by the friction between the top cover 11 and the mold 10. At the same time, the clearance fit makes it easy for the top cover 11 to be put into the mold 10, or to be removed from the mold 10.

[0053] According to some embodiments of this application, the position of the clamping member 12 relative to the contour mold 10 along a first direction is adjustable, wherein the first direction is the height direction of the contour mold 10.

[0054] The first direction in this embodiment can be referenced. Figure 1 The height direction of the middle profiling mold 10.

[0055] In this embodiment, multiple screw holes can be provided on the left and right sides of the molding die 10, and the screw holes on each side are distributed along the first direction. By fixing the clamping member 12 in the screw holes at different positions with bolts, the position of the clamping member 12 in the first direction can be adjusted.

[0056] It is understandable that in this embodiment, electric telescopic rods can also be fixed to the left and right sides of the mold 10 by bolts. The telescopic direction of the electric telescopic rod is the first direction. The clamping member 12 is connected to the electric telescopic rod. The electric telescopic rod can drive the clamping member 12 to adjust its position in the first direction. This embodiment does not limit the structure of the clamping member 12 for adjusting its position in the first direction.

[0057] In this embodiment, since the position of the clamping member 12 in the first direction is adjustable, the clamping member 12 can be clamped onto the corresponding top cover 11 by adjusting its position.

[0058] According to some embodiments of this application, such as Figure 2 and combined Figure 3 , Figure 4 , Figure 5 As shown, the clamping member 12 includes a connecting block 121 and a clamp 122. The side of the mold 10 is provided with an elongated hole 102 extending in a first direction. The clamp 122 is disposed on the connecting block 121 and is configured to clamp the top cover 11. The connecting block 121 is disposed on the side of the mold 10 and the position of the connecting block 121 relative to the elongated hole 102 is adjustable.

[0059] In this embodiment, the clamp 122 can be a quick clamp, a clip, etc. The specific type can be determined according to the actual situation, and this embodiment does not limit it.

[0060] In this embodiment, the clamp 122 is bolted to the connecting block 121, and the connecting block 121 is fixed to the side of the mold 10 after being bolted into the elongated hole 102. When it is necessary to adjust the position of the connecting block 121, the bolt is loosened, the connecting block 121 is moved along the first direction, and finally it is fixed with bolts, thereby realizing the adjustment of the position of the clamp 122.

[0061] It should be noted that the structure of the clamping component described above is merely an example. Other alternative structures can also be used. For instance, the clamping component may include an electric telescopic rod and a clamp, with the electric telescopic rod fixed to the side of the mold and the clamp fixed to the electric telescopic rod. This application does not impose any special restrictions on the specific structure of the clamping component, as long as the above structure achieves the purpose of this application.

[0062] According to some embodiments of this application, such as Figure 4 or Figure 5 As shown, the clamp 122 is provided with a protrusion 1221, and a flexible layer is provided on the protrusion 1221; when the clamp 122 clamps the top cover 11, the flexible layer abuts against the top cover 11.

[0063] The flexible layer in this embodiment can be rubber, sponge, etc., and the specific material can be determined according to the actual situation. This specification does not limit this embodiment.

[0064] When in use, when the clamp 122 clamps the top cover 11, the flexible layer abuts against the top cover 11. This can prevent the pressure of the protrusion 1221 on the top cover 11 from being too great when the clamp 122 clamps the top cover 11, which would cause the top cover 11 to deform.

[0065] According to some embodiments of this application, such as Figure 6 As shown, the welding auxiliary device also includes an elastic component 13, which is disposed on the bottom surface of the mold 10.

[0066] In this embodiment, the elastic component 13 can refer to a component that can deform under the action of external force and return to its original shape after the external force is removed. The elastic component 13 can be elastically compressed in the first direction. The elastic component 13 can be made of metal or non-metal.

[0067] In this embodiment, the elastic component 13 can be bolted to the bottom surface of the mold 10. In this way, when the mold 10 is subjected to excessive pressure along the first direction, the elastic component 13 can buffer the deformation caused by excessive pressure on the bottom surface of the mold 10.

[0068] According to some embodiments of this application, such as Figure 6 As shown, the elastic component 13 includes a fixed plate 131, a connecting plate 132, a connecting rod 133, and an elastic element 134. The connecting plate 132 is disposed on the bottom surface of the mold 10. The connecting rod 133 passes through the fixed plate 131 along a first direction and is connected to the side of the connecting plate 132 away from the mold 10. The elastic element 134 is disposed between the connecting plate 132 and the fixed plate 131.

[0069] In this embodiment, it can refer to the ability to deform under the action of external force and return to its original shape after the external force is removed. The elastic element 134 can be elastically compressed in the height direction of the mold 10. The elastic element 134 can be made of metal or non-metal, such as leaf spring, helical spring, gas spring, rubber spring, etc. The specific material can be determined according to the actual situation. This embodiment of the specification does not limit this.

[0070] This embodiment includes at least two connecting rods 133 and two elastic elements 134. A connecting plate 132 is disposed on the bottom surface of the molding die 10. Each connecting rod 133 passes through a fixed plate 131 from bottom to top along a first direction and connects to the side of the connecting plate 132 opposite to the molding die 10. At this time, the end of the connecting rod 133 away from the connecting plate 132 is located outside the bottom surface of the fixed plate 131. Furthermore, the connecting rod 133 can move relative to the fixed plate 131 in the first direction. Both elastic elements 134 are disposed between the fixed plate 131 and the connecting plate 132, and are located between the two connecting rods 133. It is understood that this application may also include three or four connecting rods 133 and elastic elements 134, etc., and this is not limited here.

[0071] In this embodiment, the initial state of the elastic element 134 installed between the fixed plate 131 and the connecting plate 132 can be when the elastic element 134 is in its natural state, at which time the contour mold 10 is not placed on the connecting plate 132. After the contour mold 10 is fixed to the connecting plate 132, the connecting plate 132 causes the elastic element 134 to press down, and the lower end of the connecting rod 133 continues to extend relative to the fixed plate 131. At this time, the elastic element 134 is in a compressed state. In this way, excessive pressure on the bottom surface of the contour mold 10 can be avoided, which could cause deformation.

[0072] According to some embodiments of this application, such as Figure 6 As shown, the welding auxiliary device also includes a drive member 14 and a cover plate 15, wherein the drive member 14 is connected to the cover plate 15 and is configured to drive the cover plate 15 to move in a first direction; under the condition that the cover plate 15 moves in the first direction, the cover plate 15 can contact the side of the top cover 11 away from the mold 10.

[0073] In this embodiment, the driving component 14 can be a cylinder, an electric telescopic rod, etc. The specific one can be determined according to the actual situation, and this specification does not limit it in this embodiment.

[0074] The first direction in this embodiment can be referred to the above description, and will not be repeated here.

[0075] In this embodiment, reference Figure 6 As shown, the drive unit 14 drives the cover plate 15 to press down the top cover 11 in the first direction, so that the top cover 11 is in a horizontal state. In this way, during the welding process of the welding equipment 16, such as a laser welding machine, the quality of the weld penetration can be guaranteed to be qualified.

[0076] According to some embodiments of this application, such as Figure 1 As shown, the molding die 10 has a through hole 101. This allows excess weight blocks to be removed.

[0077] According to some embodiments of this application, the contour mold 10 includes a plurality of counterweights, and adjacent counterweights are detachably connected.

[0078] In this embodiment, each counterweight has a groove and a protrusion on opposite sides. The protrusion on one counterweight can be inserted into the groove on another counterweight. By adding or removing the number of counterweights, the weight of the corresponding molding mold 10 can be adjusted so that the weight of the molding mold 10 is the same as the weight of the corresponding battery cell. Of course, it is understood that the molding mold 10 can also be made by bonding multiple counterweights together. The specific method can be determined according to the actual situation, and this embodiment does not limit this.

[0079] In this embodiment, the weight of the contour mold can be adjusted by removing or installing the counterweight.

[0080] This application also provides a battery production line, including welding auxiliary devices as described in any of the embodiments of this application.

[0081] The specific structure of the welding auxiliary device in this embodiment refers to the above embodiment. Since the battery production line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding auxiliary device, characterized in that, include: A contouring mold, the weight of which is adjustable; Top cover, the top cover being disposed on the conforming mold; A clamping element is disposed on the side of the mold and configured to clamp the top cover.

2. The welding auxiliary device according to claim 1, characterized in that, The top cover and the molded mold are fitted with a clearance.

3. The welding auxiliary device according to claim 1, characterized in that, The position of the clamping member relative to the contour mold along a first direction is adjustable, wherein the first direction is the height direction of the contour mold.

4. The welding auxiliary device according to claim 3, characterized in that, The clamping component includes a connecting block and a clamp, and the side of the conforming mold is provided with an elongated hole extending along the first direction; The clamp is disposed on the connecting block and configured to clamp the top cover. The connecting block is disposed on the side of the mold and its position relative to the elongated hole is adjustable.

5. The welding auxiliary device according to claim 4, characterized in that, The clamp is provided with a protrusion, and the protrusion is provided with a flexible layer; When the clamp holds the top cover, the flexible layer abuts against the top cover.

6. The welding auxiliary device according to any one of claims 1 to 5, characterized in that, The welding auxiliary device further includes an elastic component, which is disposed on the bottom surface of the conforming mold.

7. The welding auxiliary device according to claim 6, characterized in that, The elastic component includes a fixed plate, a connecting plate, a connecting rod, and an elastic element; The connecting plate is disposed on the bottom surface of the mold, the connecting rod passes through the fixed plate along the first direction and is connected to the side of the connecting plate opposite to the mold, and the elastic element is disposed between the connecting plate and the fixed plate.

8. The welding auxiliary device according to claim 1, characterized in that, The welding auxiliary device further includes a driving component and a cover plate, wherein the driving component is connected to the cover plate and is configured to drive the cover plate to move along a first direction; When the cover plate moves along the first direction, the cover plate can contact the side of the top cover away from the mold.

9. The welding auxiliary device according to claim 1, characterized in that, The molding die has through holes.

10. The welding auxiliary device according to claim 1, characterized in that, The contouring mold includes multiple counterweights, and adjacent counterweights are detachably connected.

11. A battery production line, characterized in that, Includes the welding auxiliary device as described in any one of claims 1 to 10.

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