Welding device and battery production system

Abstract

The utility model discloses a welding device and a battery production system. The welding device comprises a welding seat, a first connecting rod, a second connecting rod, a first connecting rod, a second connecting rod and a third connecting rod, and an inserting groove is formed in one side of the welding seat and extends in the first direction and penetrates at least one end of the welding seat; part of the welding head is configured to be in sliding fit with the inserting groove in the mode of sliding in the first direction, the inserting groove is used for limiting movement of the welding head in the second direction, and the first direction intersects with the second direction. The welding head can be matched with the inserting groove in a sliding mode, when the welding head needs to be replaced, the welding head can be pulled out of the inserting groove, replacement of the welding head is achieved, compared with the structure that the welding head and the welding base are integrated, replacement of the welding base can be reduced, and therefore replacement cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a welding device, in particular to a welding device and a battery production system. BACKGROUND

[0002] The welding head and the welding seat of the current welding device are integrated, and in the welding process, the welding head is prone to sticking to the workpiece to be welded. After the welding head and the workpiece to be welded are separated, the welding head is prone to damage. Long-term use will damage the welding head, and the welding head and the welding seat need to be replaced together, increasing the replacement cost. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a welding device and a battery production system, which can reduce the replacement cost of the welding head.

[0004] In a first aspect, the present application provides a welding device, comprising:

[0005] a welding seat, one side of the welding seat is provided with a slot, the slot extends along a first direction and penetrates at least one end of the welding seat;

[0006] a welding head, part of the welding head is configured to be in sliding fit with the slot in a manner that can slide along the first direction, the slot is used to limit the movement of the welding head along a second direction, and the first direction intersects the second direction.

[0007] The welding head can be matched with the slot by sliding. When the welding head needs to be replaced, the welding head can be pulled out of the slot to realize the replacement of the welding head. Compared with the structure that the welding head and the welding seat are integrated, the replacement of the welding seat can be reduced, thereby reducing the replacement cost.

[0008] In some embodiments, the welding head comprises a first part and a second part, one end of the first part along the second direction is connected with the second part, and the first part and the second part are configured to be able to be in sliding fit with the slot along the first direction respectively. One side of the first part away from the second part has a first working surface, and one side of the second part away from the first part has a second working surface. One of the first working surface and the second working surface can be selectively used to abut against the workpiece to be welded.

[0009] In the process of welding, the first working surface and / or the second working surface can be in contact with the workpiece to be welded. When the first part is damaged, the welding head can be turned over, the first part is inserted into the slot, and the second working surface of the second part is used as the working surface to improve the service life of the welding head, thereby reducing the replacement frequency of the welding head.

[0010] In some embodiments, the first part and the second part jointly define a limiting slot, the limiting slot extends along the first direction, and part of the wall body of the slot is located in the limiting slot.

[0011] The part of the wall of the slot is located in the limiting slot, which can limit the movement of the welding head along the second direction, so that the welding head does not separate from the welding seat during the welding process, thereby enabling the welding to proceed smoothly.

[0012] In some embodiments, the first working surface is provided with an anti-sticking coating, and / or the second working surface is provided with an anti-sticking coating, and / or the slot comprises a first inner wall, the first inner wall is matched with the end surface of the welding head along the second direction, and the first inner wall is provided with an anti-sticking coating.

[0013] In this way, the first working surface and / or the second working surface are provided with an anti-sticking coating, which can reduce the probability of sticking between the welding head and the workpiece during welding, thereby prolonging the service life of the welding head. The first inner wall is provided with an anti-sticking coating, which can reduce the probability of the chips generated by friction during the insertion of the welding head falling into the welding area, thereby improving the welding effect.

[0014] In some embodiments, the first working surface is a plane, and the flatness of the first working surface is less than or equal to 0.5 mm; and / or the second working surface is a plane, and the flatness of the second working surface is less than or equal to 0.5 mm.

[0015] In this way, the first working surface and / or the second working surface can be relatively flat, thereby reducing the probability of sticking with the workpiece during welding.

[0016] In some embodiments, one side of the welding head along the second direction has a working surface for abutting against the workpiece, and the working surface comprises at least two working areas, which are arranged to be switchably abutted against the workpiece.

[0017] When one working area of the welding head is damaged, the welding head can be turned by 180° or the position of the workpiece is moved to switch to the other working area to abut against the workpiece, so as to perform welding, thereby reducing the replacement frequency of the welding head and prolonging the service life of the welding head.

[0018] In some embodiments, the area of the surface of the welding head away from the welding seat is S1, 72cm 2 ≤S1≤500cm 2 ; and / or the area of the bottom surface of the slot is S2, 72cm 2 ≤S2≤500cm 2 .

[0019] S1=72cm 2 and / or S2=72cm 2 , and the area of the part abutting against the welding head is 36cm 2When welding workpieces, the number of welding head replacements can be reduced. As S1 and / or S2 increases, the number of working areas also increases. However, too many working areas will also occupy a large space and increase the amount of material. In order to take into account the material consumption, space occupied and the number of welding head replacements, the value range of S1 is set to 72cm. 2 -500 cm 2 And / or the value range of S2 is set to 72cm 2 -500 cm 2 .

[0020] In some embodiments, the welding head and the slot are loosely matched, thereby reducing wear on the welding head and the slot during assembly, thereby reducing debris generated during assembly, and thus reducing debris from falling into the welding position, thereby improving welding quality.

[0021] In some embodiments, the fitting clearance between the welding head and the slot ranges from 0 to 0.05 mm.

[0022] When the gap is 0, compared with the interference fit between the welding head and the slot, the wear during the insertion process can be reduced, thereby reducing the debris generated by friction during the installation process. As the gap increases, the amount of debris can be reduced, and the fit between the welding head and the slot becomes looser and looser. In order to take into account the tightness of the welding head and the slot and reduce the debris generated during the insertion process, the value range of the fit gap between the welding head and the slot is set to between 0-0.05mm.

[0023] In some embodiments, the size of the welding head along the first direction is L1, the size of the welding base along the first direction is L2, 0≤L1-L2≤1mm, or, 0≤(L1-L2) / L1≤1%, or, 0≤(L1-L2) / L2≤1%.

[0024] During molecular diffusion welding, significant pressure is generated between the weld base and the welding head, as well as between the welding head and the workpiece being welded. A large difference between L1 and L2 can cause fracture or damage to the weld base or welding head. Therefore, the difference between L1 and L2 is limited to within 1 mm, or the ratio of the difference between the two to L1 or L2 is limited to within 1%.

[0025] In a second aspect, a battery production system includes the welding device of the first aspect, the welding device being used for welding tabs of battery cells.

[0026] Since the battery production system includes all the technical features of the welding device, the effects are the same as those described above and will not be described in detail here.

[0027] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, in the attached drawings, like reference numerals refer to same or similar components. In the drawings:

[0029] Figure 1 An isometric view of a welding device according to an embodiment of the present application;

[0030] Figure 2 An exploded view of a welding device according to an embodiment of the present application.

[0031] Reference numerals in the detailed description are as follows:

[0032] 100, welding device;

[0033] 10, welding seat; 11, slot; 111, first inner wall; 20, welding head; 21, first part; 211, first working surface; 22, second part; 221, second working surface; 23, limiting groove;

[0034] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0035] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0036] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0038] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] The welding head and the welding seat of the molecular diffusion welding are usually an integral structure. During the welding process, the welding head needs to be in contact with the to-be-welded piece, the welding head loads a predetermined pressure on the to-be-welded piece, and heat is transferred to the to-be-welded piece through a heat source, so that the to-be-welded piece is welded with the to-be-welded piece under the predetermined pressure. During the welding process, the welding head and the to-be-welded piece are prone to adhesion, and after the welding head and the to-be-welded piece are separated, the welding head is prone to damage. Long-term use will damage the welding head, and the welding head and the welding seat need to be replaced together, increasing the replacement cost.

[0044] In view of this, the welding device provided in the present application can be used for welding but is not limited to the tab of a battery monomer. The material that can be welded by the welding device includes but is not limited to copper, copper alloy, aluminum, aluminum alloy, titanium, titanium alloy, nickel, nickel alloy, stainless steel and other metal materials, and can also be welded with metal matrix composite materials such as aluminum matrix composite materials and titanium matrix composite materials. The welding device can be but is not limited to a molecular diffusion welding device.

[0045] The welding device provided in the present application can be used for welding but is not limited to the tab of a battery monomer. The material that can be welded by the welding device includes but is not limited to copper, copper alloy, aluminum, aluminum alloy, titanium, titanium alloy, nickel, nickel alloy, stainless steel and other metal materials, and can also be welded with metal matrix composite materials such as aluminum matrix composite materials and titanium matrix composite materials. The welding device can be but is not limited to a molecular diffusion welding device.

[0046] The following embodiments are described with reference to Figure 1 and Figure 2 for example with a welding device 100 according to some embodiments of the present application.

[0047] The welding device 100 includes a welding head 20 and a welding seat 10. The welding seat 10 is provided with a slot 11 on one side, and the slot 11 extends along a first direction X and penetrates at least one end of the welding seat 10. Part of the welding head 20 is configured to be slidably connected with the slot 11, and the slot 11 is used to limit the movement of the welding head 20 along a second direction Y, and the first direction X intersects with the second direction Y.

[0048] The material of the welding head 20 and the welding seat 10 includes but is not limited to graphite, titanium alloy, aluminum alloy or alloy steel material, etc., and the specific material can be determined according to the material of the to-be-welded piece.

[0049] In the direction from the welding head 20 to the welding seat 10, the width of the slot 11 can decrease, or first increase and then decrease, or first decrease and then increase, or the width of the slot 11 is constant at a preset depth (the size of the slot 11 along the second direction Y) and then decreases. For example, the slot 11 includes but is not limited to a T-shaped slot or a dovetail slot, etc.

[0050] The slot 11 can penetrate both ends of the welding seat 10 along the first direction X, or can penetrate one end of the welding seat 10 along the first direction X.

[0051] The welding head 20 can be matched with the slot 11 in a sliding manner. When the welding head 20 needs to be replaced, the welding head 20 can be pulled out of the slot 11 to realize replacement of the welding head 20. Compared with the structure that the welding head 20 and the welding seat 10 are integrated, the replacement of the welding seat 10 can be reduced, thereby reducing the replacement cost.

[0052] In some embodiments, referring to Figure 1 and Figure 2 , the welding head 20 includes a first part 21 and a second part 22. The first part 21 is connected with the second part 22 at one end along the second direction Y. The first part 21 and the second part 22 are configured to be capable of being matched with the slot 11 in a sliding manner along the first direction X respectively. The side of the first part 21 away from the second part 22 has a first working surface 211. The side of the second part 22 away from the first part 21 has a second working surface 221. One of the first working surface 211 and the second working surface 221 can be selectively used to abut against the piece to be welded.

[0053] As an example, the profile shape of the cross section of the first part 21 of the welding head 20 can be T-shaped. The profile shape of the cross section of the second part 22 of the welding head 20 can be rectangular. The cross section of the welding head 20 is perpendicular to the first direction X. The profile shape of the cross section of the welding head 20 can be determined according to the profile shape of the cross section of the slot 11.

[0054] The first working surface 211 and the second working surface 221 can be, but are not limited to, planes or curved surfaces. As an example, the first working surface 211 and the second working surface 221 can both be planes when the welding device 100 is used to weld the tab of a battery cell.

[0055] During welding, the first working surface 211 and / or the second working surface 221 can be in contact with the piece to be welded. When the first part 21 is damaged, the welding head 20 can be turned over, the first part 21 is inserted into the slot 11, and the second working surface 221 of the second part 22 is used as the working surface to improve the service life of the welding head 20, thereby reducing the replacement frequency of the welding head 20.

[0056] In some embodiments, referring to Figure 1 and Figure 2 , the first part 21 and the second part 22 jointly define a limiting groove 23. The limiting groove 23 extends along the first direction X. Part of the wall of the slot 11 is located in the limiting groove 23.

[0057] The profile shape of the cross section of the limiting groove 23 can be rectangular, U-shaped, circular-arc-shaped or trapezoidal, etc.

[0058] Part of the wall of the slot 11 is located in the limiting groove 23, which can limit the movement of the welding head 20 along the second direction Y, so that the welding head 20 will not be separated from the welding seat 10 during the welding process, so that the welding can be carried out smoothly.

[0059] In some embodiments, referring to Figure 1 and Figure 2 , the first working surface 211 is provided with an anti-sticking coating, and / or the second working surface 221 is provided with an anti-sticking coating, and / or the slot 11 comprises a first inner wall 111, the first inner wall 111 cooperates with the end surface of the welding head 20 along the second direction Y, and the first inner wall 111 is provided with an anti-sticking coating.

[0060] During the welding process, high temperature will be generated, therefore, the anti-sticking coating can be a high-temperature-resistant coating. For example, the anti-sticking coating can be a non-metallic anti-sticking coating, a Teflon coating, a silicate coating, a silicon carbide coating, or a boron carbide coating, etc.

[0061] Therefore, the first working surface 211 and the second working surface 221 are both provided with an anti-sticking coating, which can reduce the probability of sticking between the welding head 20 and the workpiece during the welding process, so as to improve the service life of the welding head 20. The bottom of the slot 11 is provided with an anti-sticking coating, which can reduce the probability of the generated chips during the insertion process of the welding head 20 falling into the welding area, thereby improving the welding effect.

[0062] In some embodiments, referring to Figure 1 and Figure 2 , the first working surface 211 is a plane, and the flatness of the first working surface 211 is less than or equal to 0.5 mm; and / or the second working surface 221 is a plane, and the flatness of the second working surface 221 is less than or equal to 0.5 mm.

[0063] The flatness refers to the deviation of the macroscopic concave-convex height of the working surface from the ideal plane.

[0064] Therefore, the first working surface 211 and / or the second working surface 221 can be relatively flat, so as to reduce the probability of sticking with the workpiece during the welding process.

[0065] In some embodiments, the area of the surface of the welding head 20 away from the welding seat 10 is S1, 72cm 2 ≤S1≤500cm 2 ; and / or the area of the first inner wall 111 is S2, 72cm 2 ≤S2≤500cm 2 .

[0066] The surface of the welding head 20 away from the welding seat 10 can be the first working surface 211 or the second working surface 221, and the areas of the first working surface 211 and the second working surface 221 can be set to be the same or different.

[0067] S1 = 72 cm 2 and / or S2 = 72 cm 2 When welding the workpiece with an area of 36 cm 2 supplied to the welding head 20, the replacement frequency of the welding head 20 can be reduced. As S1 and / or S2 increase, the number of work areas also increases. However, too many work areas will occupy a large space and increase the amount of material used. In order to balance the amount of material used for the welding head 20, the space occupied, and the reduction of the replacement frequency of the welding head 20, the value range of S1 is set to 72 cm 2 - 500 cm 2 and / or the value range of S2 is set to 72 cm 2 - 500 cm 2 .

[0068] In some embodiments, the welding head 20 and the slot 11 are in clearance fit.

[0069] The welding head 20 can be in clearance fit with the side wall of the slot 11 or in clearance fit with the bottom wall of the slot 11.

[0070] In this way, the wear between the welding head 20 and the slot 11 during assembly can be reduced, thereby reducing the debris generated during assembly, and thus reducing the debris falling into the welding position to improve the welding quality.

[0071] In some embodiments, the clearance fit between the welding head 20 and the slot 11 has a value range of 0-0.05 mm.

[0072] When the clearance is 0, compared with the interference fit between the welding head 20 and the slot 11, the wear during assembly can be reduced, thereby reducing the debris generated by friction during assembly. As the clearance increases, the amount of debris can be reduced. The fit between the welding head 20 and the slot 11 becomes looser and looser. In order to balance the tightness between the welding head 20 and the slot 11 and reduce the debris generated during assembly, the value range of the clearance fit between the welding head 20 and the slot 11 is set to 0-0.05 mm.

[0073] In some embodiments, please refer to Figure 2 The size of the welding head 20 along the first direction X is L1, and the size of the welding seat 10 along the first direction X is L2, 0≤L1-L2≤1 mm, or 0≤(L1-L2) / L1≤1%, or 0≤(L1-L2) / L2≤1%.

[0074] When the molecular diffusion welding is in operation, a large pressure is generated between the welding seat 10 and the welding head 20 and between the welding head 20 and the workpiece to be welded. When the difference between L1 and L2 is large, the welding seat 10 can be damaged by fracture. Therefore, the difference between L1 and L2 is limited to within 1 mm, or the ratio of the difference between L1 and L2 to L1 or L2 is limited to within 1%.

[0075] In some embodiments, referring to Figure 1 and Figure 2 the welding head 20 has a working surface on one side along the second direction Y for abutting against the workpiece to be welded, and the working surface comprises at least two working areas arranged to be switchably abuttable against the workpiece to be welded.

[0076] The working surface can comprise the first working surface 211 and / or the second working surface 221.

[0077] One working area refers to an area abutting against the workpiece to be welded during welding.

[0078] When one working area of the welding head 20 is damaged, the welding head 20 can be turned by 180° or the position of the workpiece to be welded can be moved to switch to the other working area to abut against the workpiece to be welded for welding, so that the replacement frequency of the welding head 20 can be reduced and the service life of the welding head 20 can be prolonged.

[0079] The following embodiments are described by taking a battery production system of some embodiments of the present application as an example for convenience of description.

[0080] The battery production system comprises the welding device 100 of the above embodiments, and the welding device 100 is used for welding the tab of the battery monomer.

[0081] Since the battery production system comprises all the technical features of the welding device 100, the effects are the same as described above, and will not be described here again.

[0082] In an optional embodiment of the welding device 100, referring to Figure 1 and Figure 2The welding device 100 comprises a welding head 20 and a welding base 10. The welding base 10 is provided with a slot 11 on one side, the slot 11 extending along a first direction X and penetrating at least one end of the welding base 10. Part of the welding head 20 is configured to be in sliding fit with the slot 11 in a manner that is slidable along the first direction X, the slot 11 being used to limit the movement of the welding head 20 along a second direction Y, the first direction X intersecting the second direction Y. The welding head 20 comprises a first part 21 and a second part 22, the first part 21 being connected to the second part 22 at one end along the second direction Y, the first part 21 and the second part 22 being configured to be in sliding fit with the slot 11 along the first direction X respectively, the first part 21 being provided with a first working surface 211 on a side facing away from the second part 22, the second part 22 being provided with a second working surface 221 on a side facing away from the first part 21, one of the first working surface 211 and the second working surface 221 being selectively used to abut against a workpiece to be welded. The first part 21 and the second part 22 jointly define a limiting slot 23 extending along the first direction X, part of a wall of the slot 11 being located in the limiting slot 23. The first working surface 211 and the second working surface 221 are both provided with an anti-sticking coating. The slot 11 comprises a first inner wall 111, the first inner wall 111 being in fit with an end surface of the welding head 20 along the second direction Y, the first inner wall 111 being provided with an anti-sticking coating. The flatness of the first working surface 211 and the flatness of the second working surface 221 are both less than or equal to 0.5 mm. The area of a surface of the welding head 20 facing away from the welding base 10 is S1, the area of a bottom surface of the slot 11 is S2, S1, S2 satisfy: 72 cm 2 ≤ S1 ≤ 500 cm 2 , 72 cm 2 ≤ S2 ≤ 500 cm 2 . The welding head 20 and the slot 11 are in clearance fit. The fit clearance between the welding head 20 and the slot 11 ranges from 0 to 0.05 mm. The dimension of the welding head 20 along the first direction X is L1, the dimension of the welding base 10 along the first direction X is L2, 0 ≤ L1-L2 ≤ 1 mm, or 0 ≤ (L1-L2) / L1 ≤ 1%, or 0 ≤ (L1-L2) / L2 ≤ 1%. The welding head 20 and the welding base 10 are both graphite pieces.

[0083] When one working area of the welding head 20 is damaged, the welding head 20 can be turned 180° horizontally, and the welding head 20 is switched to another working area for continuous use. When the working area on one side of the welding head 20 in the second direction Y is completely damaged, the welding head 20 can be turned upside down by 180°, i.e. the welding head 20 is pulled out of the slot 11, turned 180°, and then inserted into the slot 11, so as to use the working area on the other side of the welding head 20 in the second direction Y for welding operation. Thus, the replacement frequency of the welding head 20 can be reduced, the service life of the welding head 20 is improved, and the cost is reduced. The working area of the welding head 20 is provided with an anti-sticking coating, which can reduce the adhesion between the welding head 20 and the workpiece during welding, so as to reduce the probability of damage to the working area of the welding head 20, thereby reducing the replacement frequency of the welding head 20 and improving the service life of the welding head 20. 0≤L1-L2≤1mm, or 0≤(L1-L2) / L1≤1%, or 0≤(L1-L2) / L2≤1%, which can reduce the probability of damage to the welding head 20 or the welding seat 10 due to large local deformation during loading of the welding head 20 or the welding seat 10 on the workpiece, thereby improving the replacement frequency of the welding head 20 and the welding seat 10, and improving the service life.

[0084] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding device, characterized in that: include: A welding seat, wherein a slot is provided on one side of the welding seat, and the slot extends along a first direction and passes through at least one end of the welding seat; A welding head, part of which is configured to slideably cooperate with the slot in a manner that it can slide along the first direction, and the slot is used to limit the movement of the welding head along a second direction, and the first direction intersects with the second direction.

2. The welding device according to claim 1, characterized in that The welding head includes a first part and a second part, one end of the first part along the second direction is connected to the second part, the first part and the second part are configured to be able to slide and cooperate with the slot along the first direction respectively, the first part has a first working surface on the side facing away from the second part, and the second part has a second working surface on the side facing away from the first part, and one of the first working surface and the second working surface can be selectively used to abut against the workpiece to be welded.

3. The welding device according to claim 2, characterized in that The first portion and the second portion jointly define a limiting groove, the limiting groove extends along the first direction, and a portion of the wall of the slot is located in the limiting groove.

4. The welding device according to claim 2, characterized in that The first working surface is provided with an anti-stick coating, and / or the second working surface is provided with an anti-stick coating, and / or the slot includes a first inner wall, the first inner wall cooperates with the end face of the welding head along the second direction, and the first inner wall is provided with an anti-stick coating.

5. The welding device according to claim 2, characterized in that The first working surface is a plane, and the flatness of the first working surface is less than or equal to 0.5 mm; and / or the second working surface is a plane, and the flatness of the second working surface is less than or equal to 0.5 mm.

6. The welding device according to claim 1, characterized in that The welding head has a working surface for abutting against the workpiece to be welded on one side along the second direction, and the working surface includes at least two working areas, and the at least two working areas are configured to switchably abut against the workpiece to be welded.

7. The welding device according to claim 5, characterized in that The area of ​​the surface of the welding head away from the welding seat is S1,72cm 2 ≤S1≤500cm 2 , and / or, the slot includes a first inner wall, the first inner wall cooperates with the end face of the welding head along the second direction, and the area of ​​the first inner wall is S2,72cm 2 ≤S2≤500cm 2 .

8. The welding device according to any one of claims 1 to 7, characterized in that: The welding head is loosely matched with the slot.

9. The welding device according to claim 8, characterized in that The fitting clearance between the welding head and the slot ranges from 0 to 0.05 mm.

10. The welding device according to any one of claims 1 to 7, characterized in that: The size of the welding head along the first direction is L1, and the size of the welding base along the first direction is L2. 0≤L1-L2≤1mm, or, 0≤(L1-L2) / L1≤1%, or, 0≤(L1-L2) / L2≤1%.

11. A battery production system, characterized in that: The welding device comprises the welding device according to any one of claims 1 to 10, wherein the welding device is used for welding the tabs of a battery cell.

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