Positioning tool and welding equipment

Abstract

The invention provides a positioning tool and welding equipment, the positioning tool comprises a first positioning piece and a second positioning piece, at least part of the first positioning piece is used for extending into a shell from a fourth end so that the first end extends out of a third end, and the second positioning piece is provided with a first positioning structure and a second positioning structure. The first positioning structure is used for being matched with the first end, and the second positioning structure is used for being matched with the first flow collecting disc so as to limit the relative position of the first end and the first flow collecting disc. According to the technical scheme, the connection precision of the first collector plate and the battery cell can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing, and in particular to positioning tooling and welding equipment. Background Art

[0002] In the related art, a battery cell assembly includes a battery cell, a shell, a first current collecting plate, a second current collecting plate, a first end cover, and a second end cover. The battery cell has a first end and a second end opposite to each other, and the shell has a third end and a fourth end opposite to each other. The first current collecting plate is used to connect the first end, the first current collecting plate is connected to the first end cover, the first end cover is used to cover the third end, the second end is connected to the second current collecting plate, the second current collecting plate is connected to the second end cover, the second end cover is used to cover the fourth end, and the shell is sleeved on the battery cell. The size of the first end cover and the size of the second end cover are both relatively large, so that the first end cover and the second end cover cannot enter the shell from the third end and then leave the shell from the fourth end, nor can they enter the shell from the fourth end and then leave the shell from the third end.

[0003] It can be understood that in the battery cell assembly, the first current collecting plate and the first end cover are connected into a whole, which is referred to as the first whole here, the battery cell, the second current collecting plate and the second end cover are connected into a whole, which is referred to as the second whole here, and the first whole, the second whole and the shell are separate components.

[0004] In order to manufacture the battery cell assembly into a battery cell, the first whole body, the second whole body and the shell need to be connected together.

[0005] In order to improve the connection accuracy between the first current collecting plate and the battery cell, a set of positioning tooling is required. Summary of the invention

[0006] The embodiments of the present invention provide a positioning tool and a welding device, which can improve the connection accuracy between the first current collecting plate and the battery cell.

[0007] In a first aspect, an embodiment of the present invention provides a positioning tool for positioning a battery cell assembly, wherein the battery cell assembly comprises a battery cell, a shell, a first current collecting plate and a first end cover, wherein the battery cell has a first end, the shell has a third end and a fourth end opposite to each other, the first current collecting plate is used to connect the first end, the first current collecting plate is connected to the first end cover, the first end cover is used to cover the third end, the shell is sleeved on the battery cell, and the positioning tool comprises:

[0008] A first positioning member, at least partially used to extend from the fourth end into the housing so that the first end extends out of the third end; and

[0009] The second positioning member is provided with a first positioning structure and a second positioning structure, wherein the first positioning structure is used to cooperate with the first end, and the second positioning structure is used to cooperate with the first collecting plate to define the relative position of the first end and the first collecting plate.

[0010] In one embodiment, the first positioning member further includes a base and a protrusion disposed on the base, the protrusion is used to extend into the shell from the fourth end, and the base is used to contact the end surface of the fourth end.

[0011] In one embodiment, the outer circumferential surface of the protrusion is used to cooperate with the inner circumferential surface of the fourth end, the second positioning member is provided with a first positioning groove, and the groove side wall of the first positioning groove is used to cooperate with the third end.

[0012] In one embodiment, the battery cell also has a second end, and the battery cell assembly also includes a second current collecting disc, a second connecting portion, and a second end cover, the second current collecting disc is connected to the second end, the second connecting portion connects the second current collecting disc and the second end cover, the second end cover is used to cover the fourth end, and a second positioning groove is also provided on the peripheral side of the protrusion, and the second positioning groove is used to cooperate with the second connecting portion.

[0013] In one embodiment, the material of the bump is configured as a flexible material.

[0014] In one embodiment, the first positioning member further includes a handle disposed on the base.

[0015] In one embodiment, the first positioning structure is configured as a third positioning groove, the second positioning structure is configured as a fourth positioning groove, and the fourth positioning groove is opened on the groove bottom wall of the third positioning groove.

[0016] In one embodiment, the groove side wall of the third positioning groove is arranged in an arc shape in the circumferential direction of the third positioning groove, and the groove side wall of the fourth positioning groove is arranged in an arc shape in the circumferential direction of the fourth positioning groove.

[0017] In one embodiment, the distance between the center line of the third positioning groove and the center line of the fourth positioning groove is less than or equal to 0.7 mm.

[0018] In one embodiment, a through hole extending along the groove depth direction of the fourth positioning groove is provided on the bottom wall of the fourth positioning groove, and the through hole is used for laser to pass through;

[0019] And / or, the second positioning member is further provided with a fifth positioning groove, the third positioning groove and the fifth positioning groove are opened on the same side of the second positioning member, and the fifth positioning groove is used to cooperate with the first end cover.

[0020] In a second aspect, an embodiment of the present invention provides a welding device, comprising:

[0021] The aforementioned positioning tool; and

[0022] A welding head is used to weld the first current collecting plate and the battery core together.

[0023] In one embodiment, the welding equipment further includes a machine platform, the welding head is disposed on the machine platform, and the first positioning member and the second positioning member are used to be respectively installed on the machine platform.

[0024] In one embodiment, the platform is plugged into the first positioning member;

[0025] and / or, the machine platform is plugged into the second positioning member;

[0026] And / or, the machine includes a table body and a transfer structure, the welding head is arranged on the table body, the first positioning member and the second positioning member are respectively installed on the table body through the transfer structure, and the transfer structure is respectively detachably connected to the first positioning member, the second positioning member, and the table body.

[0027] Beneficial effects of the embodiments of the present invention:

[0028] In an embodiment of the present invention, the positioning tool includes a first positioning member and a second positioning member. In order to avoid the difficulty of the positioning tool and the first end being matched due to the first end being inside the shell, the first positioning member is at least partially used to extend into the shell from the fourth end so that the first end extends out of the third end. In this way, the first end of the battery cell extends outside the third end of the shell to reduce the difficulty of the positioning tool and the first end matching. The second positioning member is provided with a first positioning structure and a second positioning structure, the first positioning structure is used to match with the first end, and the second positioning structure is used to match with the first current collecting disk to limit the relative position of the first end and the first current collecting disk. In this way, it is beneficial to improve the connection accuracy between the first current collecting disk and the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic structural diagram of a welding device and a battery cell assembly provided by an embodiment of the present invention;

[0031] Figure 2 yes Figure 1An exploded view of the welding equipment and the battery cell assembly, wherein the welding equipment table body is hidden;

[0032] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0033] Figure 4 yes Figure 2 The enlarged view of point B in the middle;

[0034] Figure 5 yes Figure 2 A schematic structural diagram of the second positioning member and the first integral body;

[0035] Figure 6 yes Figure 1 Schematic diagram of the structure of the central positioning tooling and battery cell assembly;

[0036] Figure 7 yes Figure 6 A schematic diagram of the structure of the positioning tool and the battery cell assembly, wherein the second positioning member of the positioning tool is hidden and the first integral body of the battery cell assembly is hidden;

[0037] Figure 8 yes Figure 7 Schematic diagram of the structure of the middle convex block;

[0038] Fig. 9 yes Figure 1 A schematic diagram of the structure of a portion of the intermediate transfer structure, a second positioning member and a battery cell assembly;

[0039] Fig.10 yes Fig. 9 A schematic structural diagram of the second positioning member viewed along the groove depth direction of the third groove;

[0040] Fig.11 yes Fig.10 Enlarged view of point C in the middle;

[0041] Fig.12 yes Fig. 9 A perspective view of the second positioning member;

[0042] Fig.13 yes Figure 1 Schematic diagram of the structure of the middle machine.

[0043] Description of reference numerals:

[0044] 100, welding equipment; 200, positioning tool; 300, first positioning member; 310, convex block; 311, second positioning groove; 320, base; 330, handle; 400, second positioning member; 410, first positioning structure; 411, third positioning groove; 412, first guide section; 413, first positioning section; 420, second positioning structure; 421, fourth positioning groove; 430, first positioning groove; 440, through hole; 450, fifth positioning groove; 460, sixth positioning groove; 461, second guide section; 462, second positioning section; 470, plug-in convex part; 500, welding head; 600, machine; 61 0, table body; 611, avoidance hole; 612, seventh positioning groove; 620, transfer structure; 621, positioning block; 622, base; 623, eighth positioning groove; 624, connecting rod; 625, slot; 626, positioning pin; 700, battery cell assembly; 710, first whole; 711, first collector plate; 712, first connecting part; 713, first end cover; 720, second whole; 721, battery cell; 722, first end; 723, second end; 724, second collector plate; 725, second connecting part; 726, second end cover; 730, shell; 731, third end; 732, fourth end. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0046] According to the first aspect of the present application, referring to Figures 1 to 13The present disclosure provides a positioning tool 200, which is used to position a battery cell assembly 700. The battery cell assembly 700 includes a battery cell 721, a shell 730, a first current collecting plate 711, a second current collecting plate 724, a first end cover 713 and a second end cover 726. The battery cell 721 has a first end 722 and a second end 723 opposite to each other, and the shell 730 has a third end 731 and a fourth end 732 opposite to each other. The first current collecting plate 711 is used to connect the first end 722, the first current collecting plate 711 is connected to the first end cover 713, the first end cover 713 is used to cover the third end 731, the second end 723 is connected to the second current collecting plate 724, the second current collecting plate 724 is connected to the second end cover 726, and the second end cover 726 is used to cover the fourth end 732.

[0047] In the battery cell assembly 700, the first current collecting plate 711 and the first end cover 713 are connected into a whole, which is referred to as the first whole 710 herein, and the battery cell 721, the second current collecting plate 724 and the second end cover 726 are connected into a whole, which is referred to as the second whole 720 herein, and the first whole 710, the second whole 720 and the shell 730 are separate components respectively.

[0048] In order to manufacture the battery cell assembly 700 into a battery cell, the first body 710 , the second body 720 and the housing 730 need to be connected together.

[0049] Since the size of the first end cover 713 and the size of the second end cover 726 are both large, the first end cover 713 and the second end cover 726 cannot enter the housing 730 from the third end 731 and then leave the housing 730 from the fourth end 732, nor can they enter the housing 730 from the fourth end 732 and then leave the housing 730 from the third end 731. Therefore, before connecting the first collecting plate 711 to the first end 722, the housing 730 needs to be sleeved on the battery cell 721.

[0050] The positioning tool 200 includes a first positioning member 300 and a second positioning member 400. In order to avoid the difficulty of the positioning tool 200 and the first end 722 being matched due to the first end 722 being in the shell 730, the first positioning member 300 is at least partially used to extend into the shell 730 from the fourth end 732 so that the first end 722 extends out of the third end 731. In this way, the first end 722 of the battery cell 721 extends out of the third end 731 of the shell 730 to reduce the difficulty of the positioning tool 200 and the first end 722 matching. The second positioning member 400 is provided with a first positioning structure 410 and a second positioning structure 420, the first positioning structure 410 is used to match with the first end 722, and the second positioning structure 420 is used to match with the first current collecting plate 711 to limit the relative position of the first end 722 and the first current collecting plate 711. In this way, it is beneficial to improve the connection accuracy between the first current collecting plate 711 and the battery cell 721.

[0051] In one embodiment, the first positioning member 300 further includes a base 320 and a protrusion 310 disposed on the base 320, the protrusion 310 is used to extend from the fourth end 732 into the housing 730, and the base 320 is used to contact the end surface of the fourth end 732. In this way, the positioning fixture 200 can ensure that whenever the protrusion 310 extends from the fourth end 732 into the housing 730 and the housing 730 abuts against the end surface of the fourth end 732, the first end 722 can extend out of the third end 731 by a sufficient length, so that the second positioning member 400 can cooperate with the first collecting plate 711 and the first end 722 respectively.

[0052] Exemplarily, the positioning tool 200 is used for manual operation, which can reduce the time for the second positioning member 400 to cooperate with the first collecting plate 711 and the first end 722 respectively, and the worker does not need to pay extra attention to control the extent to which the protrusion 310 extends into the shell 730.

[0053] If the shell 730 is not positioned, the third end 731 of the shell 730 is easy to press against the battery cell 721. On the one hand, after the first end 722 and the first positioning structure 410 are matched, the first end 722 is easily offset relative to the first positioning structure 410, thereby reducing the connection accuracy between the first collector plate 711 and the battery cell 721. On the other hand, the third end 731 is also easy to scratch the battery cell 721, which makes the battery cell 721 have a greater safety hazard. For this reason, in one embodiment, the outer peripheral surface of the protrusion 310 is used to match with the inner peripheral surface of the fourth end 732, and the second positioning member 400 is provided with a first positioning groove 430, and the groove side wall of the first positioning groove 430 is used to match with the third end 731. In this way, under the positioning of the positioning tool 200, the relative posture of the shell 730 and the positioning tool 200 is relatively stable. In this way, on the one hand, the influence of the shell 730 on the connection accuracy between the first collecting plate 711 and the battery cell 721 is reduced, and on the other hand, the occurrence of the third end 731 scratching the battery cell 721 is reduced, thereby reducing the safety hazard of the battery cell 721.

[0054] After the first current collecting plate 711 and the first end 722 of the battery cell 721 are connected, the battery cell assembly 700 is connected into a whole. Subsequently, the first end cover 713 needs to be covered on the third end 731, and the second end cover 726 needs to be covered on the fourth end 732. In order to improve the automation of the battery cell production line, in one embodiment, the circumference of the protrusion 310 is further provided with a second positioning groove 311, and the second positioning groove 311 is used to cooperate with the second connecting portion 725. In this way, after the first current collecting plate 711 and the first end 722 of the battery cell 721 of each batch of battery cell assemblies 700 are connected, the relative posture consistency of the second whole 720 and the battery cell 721 is high, so that the battery cell production line can process the battery cell assembly 700 after the first current collecting plate 711 and the first end 722 are connected, which is conducive to improving the automation of the battery cell production line.

[0055] In one embodiment, the material of the protrusion 310 is configured as a flexible material. In this way, the occurrence of the protrusion 310 scratching the second current collecting plate 724 can be reduced. Exemplarily, the material of the protrusion 310 can be configured as, but not limited to, rubber.

[0056] In one embodiment, the first positioning member 300 further includes a handle 330 disposed on the base 320. Thus, after the positioning tool 200 positions the battery cell assembly 700, the worker can move the positioning tool 200 through the handle 330, thereby reducing the time that the worker's hands are in contact with the housing 730. Thus, the deformation of the housing 730 caused by excessive pressure on the housing 730 by the hands can be reduced, which is beneficial to improving the yield rate of the battery cells.

[0057] There are many structural forms of the first positioning structure 410 and the second positioning structure 420. In one embodiment, the first positioning structure 410 is configured as a third positioning groove 411, and the second positioning structure 420 is configured as a fourth positioning groove 421. The fourth positioning groove 421 is opened on the bottom wall of the third positioning groove 411. It can be understood that in the groove depth direction of the third positioning groove 411, the projection of the fourth positioning groove 421 is located within the projection of the third positioning groove 411 or is consistent with the projection of the third positioning groove 411. In the object positioned by the second positioning member 400, the size of the cross section of the battery cell 721 is greater than or equal to the size of the cross section of the first current collecting plate 711. However, the present design is not limited to this. In some other embodiments, the second positioning member 400 has a first side, the first positioning structure 410 includes a plurality of first positioning protrusions, and the plurality of first positioning protrusions are arranged in a circumferential array. The second positioning structure 420 includes a plurality of second positioning protrusions, and the plurality of second positioning protrusions are arranged in a circumferential array. The first positioning protrusions and the second positioning protrusions are both arranged on the first side, and the space enclosed by the plurality of second positioning protrusions is within the space enclosed by the plurality of first positioning protrusions. The plurality of first positioning protrusions cooperate with the outer peripheral surface of the first end 722, and the plurality of second positioning protrusions cooperate with the outer peripheral surface of the first collecting plate 711.

[0058] In one embodiment, the groove sidewall of the third positioning groove 411 is arranged in an arc shape in the circumferential direction of the third positioning groove 411, and the groove sidewall of the fourth positioning groove 421 is arranged in an arc shape in the circumferential direction of the fourth positioning groove 421. In this way, among the positioning objects of the second positioning member 400, the outer circumferential surface of the first end 722 of the battery cell 721 is in an arc shape to match the groove sidewall of the third positioning groove 411, and the outer circumferential surface of the first current collecting plate 711 is in an arc shape to match the groove sidewall of the fourth positioning groove 421. In this way, the positioning tool 200 is conducive to improving the concentricity of the battery cell 721 and the first current collecting plate 711.

[0059] It is worth mentioning that the positioning fixture 200 can be used for a production line for manufacturing cylindrical battery cells. It can be understood that the battery cell 721 of the cylindrical battery cell can be called a winding core. The outer circumference of the first end 722 of the winding core is arranged in an arc shape. The outer circumference of the first current collecting disk 711 of the cylindrical battery cell can be in an arc shape. In this way, the positioning fixture 200 is conducive to improving the concentricity of the battery cell 721 of the cylindrical battery cell and the first current collecting disk 711.

[0060] However, the present design is not limited to this. In some other implementations, the cross section of the third positioning groove 411 is set in a polygonal shape, and the cross section of the fourth positioning groove 421 is set in a polygonal shape. In this way, in the positioning object of the second positioning member 400, the outer circumference of the first end 722 of the battery cell 721 is set in a polygonal shape to match the groove side wall of the third positioning groove 411, and the outer circumference of the first current collecting plate 711 is set in a polygonal shape to match the groove side wall of the fourth positioning groove 421. In this way, the positioning tool 200 is conducive to improving the concentricity of the battery cell 721 and the first current collecting plate 711.

[0061] In the related art, the battery cell is a cylindrical battery cell, and the outer circumferential surface of the battery cell 721 and the outer circumferential surface of the first current collecting disk 711 are both arc-shaped. The concentricity of the battery cell 721 and the first current collecting disk 711 is poor, that is, the center line of the battery cell 721 and the center line of the first current collecting disk 711 are far apart, which will make the contact resistance between the battery cell 721 and the first current collecting disk 711 larger, and thus make the heat generated by the battery cell larger. To this end, in one embodiment, the distance between the center line of the third positioning groove 411 and the center line of the fourth positioning groove 421 is less than or equal to 0.7 mm. It can be understood that the extension direction of the center line of the third positioning groove 411 is the depth direction of the third positioning groove 411, and the groove depth direction of the third positioning groove 411 is as shown in FIG. Fig.12 As shown in the direction D, the extension direction of the center line of the fourth positioning groove 421 is the depth direction of the fourth positioning groove 421, and the center line of the third positioning groove 411 is arranged in parallel with the center line of the fourth positioning groove 421. This is conducive to improving the concentricity of the battery cell 721 and the first current collecting plate 711.

[0062] In one embodiment, in the groove depth direction of the third positioning groove 411, the third positioning groove 411 includes a first guide section 412 and a first positioning section 413 connected in sequence, and in the groove depth direction of the third positioning groove 411, the cross section of the first guide section 412 gradually decreases. In this way, the first end 722 of the battery cell 721 can contact the first guide section 412, and the first end 722 of the battery cell 721 can slide in the first guide section 412, so that the first end 722 of the battery cell 721 cooperates with the first positioning section 413. The first guide section 412 provides a larger diameter for the first end 722 of the battery cell 721 to enter, so that the first end 722 of the battery cell 721 can enter the first guide section 412 more easily, and under the guiding effect of the first guide section 412, the first end 722 of the battery cell 721 can smoothly enter the third positioning groove 411. Furthermore, in one embodiment, the groove sidewall of the third positioning groove 411 is arranged in an arc shape in the circumferential direction of the third positioning groove 411 , and the radial dimension of the first guide segment 412 is greater than the radial dimension of the first positioning segment 413 .

[0063] In one embodiment, the bottom wall of the fourth positioning groove 421 is provided with a through hole 440 extending along the groove depth direction of the fourth positioning groove 421, and the through hole 440 is used for laser to pass through. In this way, after the positioning tool 200 positions the battery cell 721 and the first current collecting plate 711, a laser for welding can be used to pass through the through hole 440 to weld the battery cell 721 and the first current collecting plate 711 together.

[0064] However, the present design is not limited thereto. In some other embodiments, the first current collecting disk 711 may be used to pre-coat a conductive adhesive on one side opposite to the battery cell 721. After the first current collecting disk 711 is matched with the fourth positioning groove 421, the first end 722 of the battery cell 721 is matched with the third positioning groove 411 to make the battery cell 721 contact with the side of the first current collecting disk 711 coated with the conductive adhesive, so that the battery cell 721 and the first current collecting disk 711 are bonded together.

[0065] In one embodiment, the material of the second positioning member 400 is brass or copper, so that the second positioning member 400 has a higher heat dissipation performance, and the high temperature of the second positioning member 400 after the battery cell 721 and the first current collecting plate 711 are welded is reduced.

[0066] Exemplarily, the positioning tool 200 is used for manual operation by workers. When workers use the positioning tool 200 manually, the cooling time of the second positioning member 400 can be reduced, which is conducive to the rapid batch connection of the battery cells 721 and the first current collecting plate 711.

[0067] If the first end cover 713 is not positioned, the first end cover 713 is easily pulled by human hands, mechanical arms or other components during or after the battery cell 721 and the first current collecting plate 711 are matched with the positioning tool 200, thereby causing the first current collecting plate 711 to be subjected to force. If the first current collecting plate 711 is pulled by a large force from the first end cover 713, it is easy to be deformed, thereby reducing the connection accuracy between the first current collecting plate 711 and the battery cell 721. For this reason, in one embodiment, the second positioning member 400 is further provided with a fifth positioning groove 450, and the third positioning groove 411 and the fifth positioning groove 450 are opened on the same side of the second positioning member 400, and the fifth positioning groove 450 is used to match with the first end cover 713. In this way, the first end cover 713 can be placed in the fifth positioning groove 450 so that the first end cover 713 cooperates with the fifth positioning groove 450. The position of the first end cover 713 is limited by the positioning function of the fifth positioning groove 450, which is beneficial to improve the connection accuracy between the first collecting plate 711 and the battery cell 721.

[0068] In one embodiment, the fifth positioning groove 450 is provided as a through groove, which is beneficial to lightening the second positioning member 400. When the second positioning member 400 is operated manually by a worker, the worker's effort can be saved.

[0069] In one embodiment, the sidewall of the fifth positioning groove 450 is in an arc shape. Thus, in the positioning object of the second positioning member 400 , the outer circumferential surface of the first end cover 713 is in an arc shape to match the sidewall of the fifth positioning groove 450 .

[0070] It is worth mentioning that the positioning fixture 200 can be used in a production line for manufacturing cylindrical battery cells. It can be understood that in the related art, the outer peripheral surface of the first end cover 713 of the cylindrical battery cell is in an arc shape.

[0071] In the related art, the battery cell assembly 700 also includes a first connection portion 712 connecting the first current collecting plate 711 and the first end cover 713. It can be understood that at this time, the first current collecting plate 711, the first connection portion 712 and the first end cover 713 are connected to form a first integral body 710. Since the first end cover 713 in the first integral body 710 is connected to the first current collecting plate 711 through the first connection portion 712, if the first connection portion 712 is not positioned, during or after the battery cell 721 and the first current collecting plate 711 are matched with the positioning tool 200, the first connection portion 712 is easily pulled by a human hand, a robot or other components, thereby causing the first current collecting plate 711 to be subjected to force. If the first current collecting disc 711 is pulled by the first connecting portion 712 with a large force, it is easy to deform, so that the connection accuracy between the first current collecting disc 711 and the battery cell 721 is low. Therefore, in one embodiment, the second positioning member 400 is further provided with a sixth positioning groove 460 connecting the fourth positioning groove 421 and the fifth positioning groove 450. The third positioning groove 411, the fifth positioning groove 450 and the sixth positioning groove 460 are all provided on the same side of the second positioning member 400, and the sixth positioning groove 460 is used to cooperate with the first connecting portion 712. In this way, after using the positioning tool 200, the consistency of the first integral body 710 and the battery cell 721 of each batch is improved, which is conducive to improving the yield rate of battery cells manufactured by the battery cell production line.

[0072] In one embodiment, in the groove depth direction of the sixth positioning groove 460, the sixth positioning groove 460 includes a second guide section 461 and a second positioning section 462 connected in sequence, and in the groove depth direction of the sixth positioning groove 460, the cross section of the second guide section 461 gradually decreases. In this way, the first connecting portion 712 can contact the second guide section 461, and the first connecting portion 712 can slide in the second guide section 461, so that the first connecting portion 712 cooperates with the second positioning section 462. The second guide section 461 has a larger caliber for the first connecting portion 712 to enter, so that the first connecting portion 712 can enter the second guide section 461 more easily. Under the guiding action of the second guide section 461, the first connecting portion 712 can smoothly enter the sixth positioning groove 460. Exemplarily, the first connecting portion 712 is in the form of a sheet, and the two opposite groove side walls of the second positioning section 462 respectively cooperate with the two opposite edges of the first connecting portion 712.

[0073] In the second aspect, an embodiment of the present invention provides a welding device 100, which includes a welding head 500 and the aforementioned positioning fixture 200. The positioning fixture 200 adopts all the technical solutions of all the above embodiments, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the welding head 500 is used to weld the first collector plate 711 and the battery cell 721 together.

[0074] In one embodiment, the welding device 100 further includes a CCD camera connected to the welding head 500. The welding head 500 can locate the welding position on the first current collecting plate 711 through the CCD camera. In this way, the occurrence of empty welding can be reduced.

[0075] Exemplarily, the second positioning member 400 is provided with the aforementioned through hole 440, and the welding head 500 can emit laser, so that the welding method of the first current collecting disk 711 and the battery cell 721 is laser welding. The second positioning member 400 and the first current collecting disk 711 can be made of different materials, and the through hole 440 has a distal end away from the fourth positioning groove 421. The distal end of the through hole 440 is on one side of the second positioning member 400 and is called the second side. In this way, the CCD camera can shoot the second side and distinguish the second positioning member 400 and the first current collecting disk 711 by grayscale, so that the laser of the welding head 500 can be emitted to the first current collecting disk 711 through the through hole 440 to weld the first current collecting disk 711 to the battery cell 721.

[0076] If the CCD camera distinguishes the second positioning member 400 and the first current collecting plate 711 by grayscale, the grayscale of the second positioning member 400 and the first current collecting plate 711 may be relatively close, and the CCD camera may make a misjudgment, thereby causing an empty weld between the first current collecting plate 711 and the battery cell 721. To this end, in one embodiment, the welding equipment 100 also includes a machine 600, the welding head 500 is disposed on the machine 600, and the first positioning member 300 and the second positioning member 400 are used to be installed on the machine 600 respectively. In this way, the position of the positioning fixture 200 installed on the machine 600 is relatively consistent each time, and the welding head 500 can be moved to the position where the positioning fixture 200 is installed on the machine 600 to reduce the probability of empty welds.

[0077] In one embodiment, the machine 600 is plugged into the first positioning member 300. In this way, the assembly method of the first positioning member 300 and the machine 600 is relatively simple and convenient. However, the present design is not limited to this. In some other embodiments, the first positioning member 300 and the machine 600 are fastened together by screws.

[0078] In one embodiment, the machine 600 is plugged into the second positioning member 400. In this way, the assembly method of the second positioning member 400 and the machine 600 is relatively simple and convenient. However, the present design is not limited to this. In some other embodiments, the second positioning member 400 and the machine 600 are screwed together.

[0079] In one embodiment, the machine 600 includes a table body 610 and a transfer structure 620, the welding head 500 is disposed on the table body 610, the first positioning member 300 and the second positioning member 400 are respectively installed on the table body 610 through the transfer structure 620, and the transfer structure 620 is respectively detachably connected to the first positioning member 300, the second positioning member 400, and the table body 610. In this way, when the welding equipment 100 cooperates with another positioning tool 200, the corresponding transfer structure 620 can be replaced without replacing the entire machine 600, which is conducive to saving costs.

[0080] There are various structural forms of the machine 600. In one embodiment, the table body 610 has a third side, and the third side is provided with an avoidance hole 611 and a seventh positioning groove 612 connected to the avoidance hole 611. The adapter structure 620 includes a positioning block 621 that cooperates with the seventh positioning groove 612, a base 622 connected to the positioning block 621, a connecting rod 624 connected to the base 622, and a positioning pin 626 provided on the base 622. The positioning block 621 is screwed to the table body 610, the positioning hole is screwed to the base 622, the base 622 and the connecting rod 624 are inserted into the avoidance hole 611 as a whole, the base 622 is provided with an eighth positioning groove 623, the groove side wall of the eighth positioning groove 623 is used to cooperate with the outer peripheral surface of the base 320 of the first positioning member 300, the positioning pin 626 is provided at the groove bottom of the eighth positioning groove 623, the positioning pin 626 is used to plug with the base 320 of the first positioning member 300, the connecting rod 624 is screwed to the base 320, the second positioning member 400 is provided with a plug-in convex portion 470, the connecting rod 624 is provided with a slot 625, and the plug-in convex portion 470 is used to plug with the slot 625. In addition, the plug-in convex portion 470 has a first limiting surface, and the slot 625 has a second limiting surface that cooperates with the first limiting surface to prevent the second positioning member 400 from rotating relative to the transfer structure 620. This helps to relatively fix the position of the through hole 440 and the position of the table body 610, thereby avoiding the need to readjust the welding device 100.

[0081] However, the present design is not limited thereto. In some other embodiments, the structure of the machine 600 may be other, which is not limited here, as long as the adapter structure 620 can be detachably connected to the table body 610, the first positioning member 300 and the second positioning member 400 respectively.

[0082] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A positioning tool for positioning a battery cell assembly, the battery cell assembly comprising a battery cell, a shell, a first current collecting plate and a first end cover, the battery cell having a first end, the shell having a third end and a fourth end opposite to each other, the first current collecting plate being used to connect the first end, the first current collecting plate being connected to the first end cover, the first end cover being used to cover the third end, the shell being sleeved on the battery cell, characterized in that: The positioning tooling comprises: A first positioning member, at least partially used to extend from the fourth end into the housing so that the first end extends out of the third end; and The second positioning member is provided with a first positioning structure and a second positioning structure, wherein the first positioning structure is used to cooperate with the first end, and the second positioning structure is used to cooperate with the first collecting plate to define the relative position of the first end and the first collecting plate.

2. The positioning tool according to claim 1, characterized in that: The first positioning member further includes a base and a protrusion disposed on the base, wherein the protrusion is used to extend into the housing from the fourth end, and the base is used to contact the end surface of the fourth end.

3. The positioning tool according to claim 2, characterized in that: The outer circumferential surface of the protrusion is used to cooperate with the inner circumferential surface of the fourth end, and the second positioning member is provided with a first positioning groove, and the groove side wall of the first positioning groove is used to cooperate with the third end.

4. The positioning tool according to claim 2, characterized in that: The battery cell also has a second end, and the battery cell assembly also includes a second current collecting disc, a second connecting portion, and a second end cover, the second current collecting disc is connected to the second end, the second connecting portion connects the second current collecting disc and the second end cover, the second end cover is used to cover the fourth end, and a second positioning groove is also provided on the peripheral side of the protrusion, and the second positioning groove is used to cooperate with the second connecting portion.

5. The positioning tool according to claim 2, characterized in that: The material of the bump is configured as a flexible material.

6. The positioning tool according to claim 2, characterized in that: The first positioning member also includes a handle arranged on the base.

7. The positioning tool according to claim 1, characterized in that: The first positioning structure is configured as a third positioning groove, the second positioning structure is configured as a fourth positioning groove, and the fourth positioning groove is opened on the groove bottom wall of the third positioning groove.

8. The positioning tool according to claim 7, characterized in that: The groove side wall of the third positioning groove is arranged in an arc shape in the circumferential direction of the third positioning groove, and the groove side wall of the fourth positioning groove is arranged in an arc shape in the circumferential direction of the fourth positioning groove.

9. The positioning tool according to claim 8, characterized in that: A distance between a center line of the third positioning groove and a center line of the fourth positioning groove is less than or equal to 0.7 mm.

10. The positioning tool according to claim 7, characterized in that: The bottom wall of the fourth positioning groove is provided with a through hole extending along the groove depth direction of the fourth positioning groove, and the through hole is used for laser to pass through; And / or, the second positioning member is further provided with a fifth positioning groove, the third positioning groove and the fifth positioning groove are opened on the same side of the second positioning member, and the fifth positioning groove is used to cooperate with the first end cover.

11. A welding device, characterized in that: include: The positioning tool as claimed in any one of claims 1 to 10; as well as A welding head is used to weld the first current collecting plate and the battery core together.

12. The welding device according to claim 11, characterized in that The welding equipment further comprises a machine platform, the welding head is arranged on the machine platform, and the first positioning member and the second positioning member are used to be respectively installed on the machine platform.

13. The welding device according to claim 12, characterized in that The machine platform is plugged into the first positioning member; and / or, the machine platform is plugged into the second positioning member; And / or, the machine includes a table body and a transfer structure, the welding head is arranged on the table body, the first positioning member and the second positioning member are respectively installed on the table body through the transfer structure, and the transfer structure is respectively detachably connected to the first positioning member, the second positioning member, and the table body.

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