Collecting disc jig and collecting disc

Abstract

The embodiment of the utility model provides a collector plate jig and a collector plate, and belongs to the technical field of battery processing. The current collecting disc jig comprises a jig body, a plurality of supporting protrusions used for supporting a current collecting disc are formed on the bottom wall of a containing groove, and the multiple supporting protrusions are arranged at intervals to form an avoiding space used for avoiding a welding area of the current collecting disc; the groove bottom of the containing groove is sunken downwards to form an annular sinking groove, a boss located on the inner ring of the sinking groove is correspondingly formed, and the supporting protrusion is arranged on the boss. According to the collector plate jig provided by the embodiment of the invention, the plurality of supporting bulges for supporting the collector plate are formed on the jig body, so that the deformation risk of the collector plate in the adsorption process can be reduced, and meanwhile, the plurality of supporting bulges are arranged at intervals, so that the avoiding space for avoiding the welding area of the collector plate can be formed; therefore, the clearance of the contact surface of the collector plate jig and the collector plate welding area is realized, the risks of welding slag generation and splashing can be reduced, and the welding quality is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery processing, and more specifically, to a current collector tray fixture and a current collector tray. Background Art

[0002] In the production process of batteries, the electrode assembly and the current collector tray are connected by laser welding, transported to the welding station through a feeding device, and then welded. In the related art, multiple grooves for placing the current collector tray are usually provided on the feeding device of the current collector tray. However, during the process of sucking and placing the current collector tray, the surface of the current collector tray may be contaminated by the dirt on the bottom wall of the groove. During the welding process, the presence of dirt on the current collector tray will increase the risk of slag generation and splashing, and there is room for improvement. Summary of the Utility Model

[0003] This application provides a current collector tray fixture and a current collector tray to achieve clearance between the welding area of the current collector tray and the current collector tray fixture.

[0004] In a first aspect, an embodiment of this application provides a current collector tray fixture, including:

[0005] A fixture body forming a receiving groove, the bottom wall of the receiving groove forming a plurality of support protrusions for supporting the current collector tray, and the plurality of support protrusions being spaced apart to form a clearance space for avoiding the welding area on the surface of the current collector tray;

[0006] A circular sinking groove is formed by recessing downward along the bottom of the receiving groove, and a corresponding boss located inside the sinking groove is formed, and the support protrusions are provided on the boss.

[0007] In the above technical solution, by providing the receiving groove on the fixture body, a plurality of support protrusions for supporting the current collector tray can be formed, reducing the risk of deformation of the current collector tray during the adsorption process. At the same time, the plurality of support protrusions are spaced apart to form a clearance space for avoiding the welding wire of the current collector tray, reducing the contact area between the current collector tray and the current collector tray fixture, so as to achieve clearance between the contact surface of the current collector tray fixture and the welding area of the current collector tray. Welding in the area on the current collector tray corresponding to the clearance space can reduce the risk of slag generation and splashing and improve the welding quality.

[0008] In some embodiments, the support protrusions include:

[0009] A first protrusion located at the center of the receiving groove;

[0010] A plurality of second protrusions surrounding the first protrusion in the circumferential direction, and the second protrusions are radially spaced apart from the first protrusion, and the plurality of second protrusions are circumferentially spaced apart from each other.

[0011] In the above technical solution, the second protrusion is radially spaced apart from the first protrusion, which can reduce the contact area between the jig body and the collecting plate, thereby reducing the resistance during adsorption. At the same time, the collecting plate is thin and easy to deform. The second protrusion and the first protrusion spaced apart along the radial direction help reduce the risk of deformation of the collecting plate during the adsorption process.

[0012] In some embodiments, the support protrusion further comprises:

[0013] A plurality of third protrusions are circumferentially arranged around the plurality of second protrusions, and the third protrusions are radially spaced apart from the second protrusions, and the plurality of third protrusions are circumferentially spaced apart from each other.

[0014] In the above technical solution, the support protrusions form a three-layer support structure, and the multi-level support system helps to disperse the load between the support points, optimize the contact and cooperation between the fixture body and the collecting plate, and reduce the risk of stress concentration.

[0015] In some embodiments, each edge of the supporting protrusion at the end away from the bottom of the receiving groove is chamfered.

[0016] In the above technical solution, each edge of the upper end of the support protrusion is provided with a chamfer, and the chamfer can make the contact surface of each edge smoother, thereby reducing the friction between the support protrusion and the collecting plate, and reducing the risk of damage to the collecting plate.

[0017] In some embodiments, a guide groove is provided on the outer peripheral wall of the fixture body.

[0018] In the above technical solution, by arranging the guide groove on the outer peripheral wall of the fixture body and cooperating with the positioning brackets on both sides of the transportation line, the stability of the collecting plate fixture during transportation can be improved and the deviation or shaking of the collecting plate fixture can be reduced.

[0019] In some embodiments, the outer peripheral wall of the fixture body is provided with two symmetrically distributed guide grooves at symmetrical positions.

[0020] In the above technical solution, the outer wall of the jig body is provided with two symmetrically distributed guide grooves at symmetrical positions, which can balance the guiding effects of the matching structures on both sides, reduce the risk of deflection or instability of the collecting plate jig during transportation, and contribute to the smooth operation of the collecting plate jig.

[0021] In some embodiments, the collecting plate fixture further includes: a positioning pin, which is installed on the fixture body and extends from the bottom of the accommodating groove.

[0022] In the above technical solution, by providing the positioning pin in the current collector plate fixture, the processing error caused by the offset or inaccurate positioning of the current collector plate can be reduced, thereby improving the production quality and efficiency.

[0023] In some embodiments, a chamfer is provided at the end of the positioning pin extending from the bottom of the receiving groove.

[0024] In the above technical solution, the chamfer can be used to reduce the friction between components or guide the precise docking of workpieces, which helps to reduce the risk of jamming or inaccurate positioning caused by the direct contact between the current collector plate and the end of the positioning pin.

[0025] In some embodiments, the current collector plate fixture further includes: a mounting plate. The fixture body is provided with a mounting groove on the side opposite to the receiving groove. A through hole penetrating through to the receiving groove is provided at the bottom of the mounting groove. The positioning pin is installed in the mounting groove and extends out of the receiving groove through the through hole. The mounting plate is installed in the mounting groove, and is adhesively connected between the mounting plate and the positioning pin.

[0026] In the above technical solution, through the cooperation of the mounting groove, the through hole and the positioning pin, the accuracy and stability of the positioning of the current collector plate can be improved, and the assembly process can be simplified by reducing traditional mechanical connection components, thereby enhancing the production efficiency.

[0027] In a second aspect, an embodiment of the present application provides a current collector plate.

[0028] The current collector plate is carried by using the current collector plate fixture as described in any one of the above. A positioning hole is provided in the middle of the current collector plate. After welding the connection surface of the current collector plate, a plurality of welding lines are formed. The plurality of welding lines are spaced apart circumferentially around the positioning hole, and the area where the plurality of welding lines are located is correspondingly arranged with the avoidance space.

[0029] In the above technical solution, the current collector plate is arranged on the current collector plate fixture, and a reserved part of the current collector plate is used for welding. After welding, the welding lines are formed at the reserved positions. The area where the plurality of welding lines are located is correspondingly arranged with the avoidance space.

[0030] In some embodiments, the center of the current collector plate is collinear with each of the welding lines, and each of the welding lines is spaced apart from the positioning hole and the outer peripheral edge of the current collector plate.

[0031] In the above technical solution, through a reasonable geometric arrangement, the welding stability can be improved, the probability of faults can be reduced, and thus the current transmission efficiency can be improved.

[0032] In some embodiments, the plurality of bonding wires include a plurality of first bonding wires and a plurality of second bonding wires. The length of the first bonding wires is greater than that of the second bonding wires, and the plurality of first bonding wires and the plurality of second bonding wires are arranged in an alternating manner one by one.

[0033] In the above technical solution, the bonding wires with different lengths are arranged in an alternating manner, which can effectively optimize the current distribution, reduce the current loss, and improve the electrical performance and welding stability.

[0034] In some embodiments, the distance from one of the plurality of second bonding wires to the center of the current collector is different from the distances from the other second bonding wires to the center of the current collector.

[0035] In the above technical solution, the different distances from one of the plurality of second bonding wires to the center of the current collector can be used for marking, which is convenient for subsequent fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 FIG. 18 is one of the schematic structural diagrams of the current collector fixture provided by some embodiments of the present application;

[0038] Figure 2 FIG. 22 is the schematic structural diagram of the current collector provided by some embodiments of the present application;

[0039] Figure 3 FIG. 26 is another schematic structural diagram of the current collector fixture provided by some embodiments of the present application;

[0040] Figure 4 FIG. 30 is a third schematic structural diagram of the current collector fixture provided by some embodiments of the present application;

[0041] Figure 5 FIG. 34 is Figure 4 the cross-sectional view taken along line A-A in FIG.

[0042] Reference numerals:

[0043] Current collector fixture 1;

[0044] Fixture body 10;

[0045] Receiving groove 110;

[0046] Support protrusion 120, first protrusion 121, second protrusion 122, third protrusion 123;

[0047] Avoidance space 130, sinking groove 140, boss 150,

[0048] Guide groove 160;

[0049] Installation groove 170;

[0050] Positioning pin 20, mounting plate 30;

[0051] Current collecting plate 40, positioning hole 410;

[0052] Bonding wire 420, first bonding wire 421, second bonding wire 422;

[0053] First included angle α, second included angle β. Detailed implementation manners

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts fall within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0056] Referring to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0057] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0058] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and back associated objects.

[0059] The "multiple" mentioned in the present application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0060] According to some embodiments of the present application, referring to Figures 1 - 3 , Figure 1 is one of the structural schematic diagrams of the current collector tray fixture 1 provided by some embodiments of the present application. Figure 2 is the structural schematic diagram of the current collector tray 40 provided by some embodiments of the present application. Figure 3 is the second structural schematic diagram of the current collector tray fixture 1 provided by some embodiments of the present application. The present application provides a current collector tray fixture 1, including a fixture body 10. The fixture body 10 forms a receiving groove 110. The bottom wall of the receiving groove 110 forms a plurality of support protrusions 120 for supporting the current collector tray 40. The plurality of support protrusions 120 are spaced apart to form an avoidance space 130 for avoiding the welding area on the surface of the current collector tray 40. At the same time, a circular sinking groove 140 is formed by sinking downward along the bottom of the receiving groove 110, and a corresponding boss 150 located inside the sinking groove 140 is formed. The support protrusions 120 are provided on the boss 150.

[0061] A battery cell generally includes a housing, an electrode assembly, and a cover assembly. The housing is used to accommodate the electrode assembly. The electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The cover assembly is used to seal the housing, and a pole post is provided on the cover assembly. The battery cell mainly works by the movement of metal ions between the positive electrode plate and the negative electrode plate.

[0062] The current collector tray 40 mainly serves as a component for current collection and conduction in the battery cell and is usually connected between the electrode assembly and the cover assembly. Specifically, the current collector tray 40 serves as a bridge between the electrode active material and the external circuit, can collect the current generated by the electrode assembly, and conduct it to the pole post on the cover assembly to form a closed loop.

[0063] Exemplarily, the current collector plate 40 includes a positive current collector plate and a negative current collector plate. The positive current collector plate is usually an aluminum foil and is used to connect with the positive electrode plate in the electrode assembly. The negative current collector plate is usually a copper foil and is used to connect with the negative electrode plate in the electrode assembly.

[0064] The connection method between the current collector plate 40 and the electrode assembly includes but is not limited to welding, mechanical connection, conductive adhesive bonding, etc. Exemplarily, the current collector plate 40 and the electrode assembly can be connected by welding, and after welding, a welding wire 420 is formed in the welding area on the current collector plate 40.

[0065] During the actual working process, the current collector plate 40 is installed on the current collector plate fixture 1 at the loading station, and then transported to the welding station through the logistics line, and welding is performed between the current collector plate 40 and the electrode assembly. It should be noted that the welding wire 420 is formed only after the current collector plate 40 is welded. During the transportation process before welding, there is no welding wire 420 on the current collector plate 40.

[0066] The current collector plate fixture 1 includes a fixture body 10. The fixture body 10 is the basic part of the current collector plate fixture 1 and is used to support and fix the current collector plate 40 on the logistics line. The fixture body 10 has sufficient rigidity and stability to reduce the displacement or deformation of the current collector plate 40 during transportation.

[0067] Exemplarily, the manufacturing materials of the fixture body 10 include but are not limited to wear-resistant and anti-static materials such as engineering plastics or metals. For example, the fixture body 10 can be made of polyphenylene sulfide.

[0068] As Figure 1 shown, a receiving groove 110 is formed on the fixture body 10 for receiving the current collector plate 40. Specifically, the upper surface of the fixture body 10 is recessed downward to form a circular receiving groove 110, and a plurality of support protrusions 120 for supporting the current collector plate 40 are formed on the bottom wall of the receiving groove 110, and the height of the support protrusions 120 is the same as the depth of the receiving groove 110, that is, the support protrusions 120 do not protrude beyond the upper surface of the fixture body 10.

[0069] The current collector plate 40 can be placed on the support protrusions 120. The heights of the plurality of support protrusions 120 are the same, so that the current collector plate 40 is evenly supported in a horizontal state, and the current collector plate 40 is restricted by the positioning structure to reduce the offset between the current collector plate 40 and the fixture body 10 during transportation and keep a relatively static state with the fixture body 10.

[0070] The specific shapes and dimensions of the receiving groove 110 and the support protrusions 120 in the current collector plate fixture 1 match the current collector plate 40 being transported. Exemplarily, the battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The projection shape of the current collector plate 40 in the thickness direction can also be circular or rectangular, etc.

[0071] The plurality of supporting protrusions 120 of the current collector tray fixture 1 are arranged at intervals, and an avoidance space 130 can be formed for avoiding the welding area of the current collector tray 40. The plurality of supporting protrusions 120 are arranged at intervals on the bottom wall of the receiving groove 110 to form partial support for the bottom of the current collector tray 40, and the partial support can reduce the adhesion of dust or foreign objects on the current collector tray 40.

[0072] When the current collector tray 40 contacts the supporting protrusion 120, foreign objects on the supporting protrusion 120 will contaminate the current collector tray 40. During welding, these foreign objects will cause the generation and splashing of welding slag, affecting the welding quality. The current collector tray 40 at the avoidance space 130 does not contact the supporting protrusion 120, which can reduce the contact area and at the same time reduce the risk of scratching or contaminating the welding area on the surface of the current collector tray 40.

[0073] In addition, referring to Figure 1 and Figure 3 , an annular sinking groove 140 is formed by sinking downward along the bottom of the receiving groove 110, and a corresponding boss 150 located inside the sinking groove 140 is formed. The supporting protrusions 120 are arranged on the boss 150.

[0074] The sinking groove 140 sinks along the direction away from the receiving groove 110 from the bottom of the receiving groove 110, and the outer circle of the sinking groove 140 is aligned with the outer circle of the receiving groove 110 in the vertical direction. At the same time, the annular sinking groove 140 surrounds to form a boss 150 located inside the sinking groove 140. The top of the boss 150 is flush with the bottom of the receiving groove 110, and a plurality of supporting protrusions 120 are arranged on the boss 150. Exemplarily, the shape of the boss 150 includes but is not limited to a cylindrical shape.

[0075] The sinking groove 140 can be used to accommodate foreign objects on the boss 150 and reduce the adverse effects on the current collector tray 40 caused by the presence of foreign objects on the boss 150. Exemplarily, before placing the current collector tray 40, foreign objects on the boss 150 and the supporting protrusions 120 can be swept into the sinking groove 140 through a cleaning device such as a brush, so as to keep the boss 150 and the supporting protrusions 120 clean.

[0076] The plurality of supporting protrusions 120 are distributed at intervals to form an avoidance space 130 for avoiding the welding area of the current collector tray 40. When the current collector tray 40 is placed on the supporting protrusions 120, the space between the current collector tray 40 and the boss 150 is the avoidance space 130, and the corresponding part on the current collector tray 40 to the avoidance space 130 is the welding area. After the current collector tray 40 is welded to the electrode assembly, a bonding wire 420 is formed.

[0077] In addition, at the loading station, the current collector tray 40 is placed on the supporting protrusions 120 of the fixture body 10 through a vacuum chuck. The current collector tray fixture 1 is transported to the welding station through a logistics line, and the current collector tray 40 is sucked from the current collector tray fixture 1 again through a vacuum chuck and transferred to the welding equipment.

[0078] The current collector tray 40 is placed on the support protrusions 120 through a vacuum chuck. When the vacuum chuck sucks the current collector tray 40 located on the support protrusions 120, the spaced-apart support protrusions 120 can reduce the contact area between the fixture body 10 and the current collector tray 40, thereby reducing the resistance during adsorption and making it easier for the vacuum chuck to suck. At the same time, the current collector tray 40 is relatively thin and prone to deformation, and the spaced distribution of the support protrusions 120 helps to reduce the risk of deformation of the current collector tray 40 during the adsorption process.

[0079] It can be understood that by providing an annular sunk groove 140 at the bottom of the receiving groove 110 and forming a boss 150 on the sunk groove 140, the adverse effects caused by foreign objects on the boss 150 to the current collector tray 40 can be reduced.

[0080] During the production process of the battery, the electrode assembly and the current collector tray are connected by laser welding. The electrode assembly is transported to the welding station through a feeding device and then welded. In the related art, in order to transport the current collector tray from the feeding station to the welding station through a logistics line, multiple regularly distributed grooves are usually provided on the feeding device, and the current collector tray is placed in the grooves during feeding to achieve the fixation of the current collector tray. However, during the process of sucking and placing the current collector tray, the surface of the current collector tray may be contaminated by the bottom wall of the groove. During the welding process, the presence of dirt on the current collector tray will increase the risk of slag generation and spatter, and there is room for improvement.

[0081] Based on the above considerations, in order to solve the problem that the current collector tray is easily contaminated during transportation, the inventor has conducted in-depth research and designed a current collector tray fixture 1, which includes a fixture body 10. The fixture body 10 forms a receiving groove 110, and the bottom wall of the receiving groove 110 forms a plurality of support protrusions 120 for supporting the current collector tray 40. The plurality of support protrusions 120 are spaced apart to form an avoidance space 130 for avoiding the welding area of the current collector tray 40.

[0082] In the current collector tray fixture 1 with this structure, by providing a receiving groove 110 on the fixture body 10, a plurality of support protrusions 120 for supporting the current collector tray 40 can be formed, reducing the risk of deformation of the current collector tray 40 during the adsorption process. At the same time, the plurality of support protrusions 120 are spaced apart, and an avoidance space 130 for avoiding the welding area of the current collector tray 40 can be formed, reducing the contact area between the current collector tray 40 and the current collector tray fixture 1, thereby achieving clearance of the contact surface between the current collector tray fixture 1 and the welding area of the current collector tray 40. Welding is performed on the area of the current collector tray 40 corresponding to the avoidance space 130, which can reduce the risk of slag generation and spatter and improve the welding quality.

[0083] According to some embodiments of the present application, with reference to Figure 3 and Figure 4 , Figure 4This is the third schematic diagram of the current collector tray fixture 1 provided by some embodiments of the present application. The support protrusions 120 include a first protrusion 121 and a plurality of second protrusions 122. The first protrusion 121 is located at the center of the accommodation groove 110. The plurality of second protrusions 122 are circumferentially arranged around the first protrusion 121, and the second protrusions 122 are radially spaced apart from the first protrusion 121. The plurality of second protrusions 122 are circumferentially spaced apart from each other.

[0084] In this embodiment, a plurality of support protrusions 120 are provided on the boss 150. The first protrusion 121 is located at the center of the accommodation groove 110. The boss 150 is located at the center of the counterbore 140, and the first protrusion 121 is simultaneously located at the center of the boss 150. The first protrusion 121 is annular and is used for the positioning pin 20 to pass through. The positioning pin 20 is a part of the current collector tray fixture 1. The positioning pin 20 is installed on the fixture body 10 and is used to fix the current collector tray 40.

[0085] Specifically, the upper end of the first protrusion 121 is flush with the notch of the accommodation groove 110, and the lower end of the first protrusion 121 is flush with the bottom of the accommodation groove 110. The positioning pin 20 extends out from the bottom of the accommodation groove 110, penetrates through the first protrusion 121, and extends beyond the notch of the accommodation groove 110. When the current collector tray 40 is placed on the fixture body 10, the part of the positioning pin 20 that extends beyond the notch of the accommodation groove 110 passes through the circular hole at the center of the current collector tray 40, and the current collector tray 40 is fixed on the fixture body 10.

[0086] The support protrusions 120 further include a plurality of second protrusions 122. The plurality of second protrusions 122 are circumferentially arranged around the first protrusion 121 to support the current collector tray 40 in multiple directions. The plurality of second protrusions 122 are circumferentially spaced apart from each other. The gap between adjacent second protrusions 122 is a part of the avoidance space 130. The circumferentially spaced-apart plurality of second protrusions 122 contribute to the uniform distribution of the load, and can also reduce the interference between the protrusions and improve the structural stability.

[0087] Exemplarily, the second protrusion 122 can be fan-shaped.

[0088] In addition, the second protrusions 122 are radially spaced apart from the first protrusion 121, which can reduce the contact area between the fixture body 10 and the current collector tray 40, thereby reducing the resistance during adsorption. At the same time, the current collector tray 40 is relatively thin and easily deformed. The second protrusions 122 and the first protrusion 121 that are radially spaced apart help to reduce the risk of deformation of the current collector tray 40 during the adsorption process.

[0089] According to some embodiments of the present application, refer to Figure 3, the supporting protrusion 120 further includes a plurality of third protrusions 123. The plurality of third protrusions 123 surround the plurality of second protrusions 122 in the circumferential direction, and the third protrusions 123 are spaced apart from the second protrusions 122 in the radial direction. The plurality of third protrusions 123 are spaced apart from each other in the circumferential direction.

[0090] In this embodiment, the supporting protrusion 120 includes a first protrusion 121, a plurality of second protrusions 122 and a plurality of third protrusions 123. The first protrusion 121 is located at the center of the receiving groove 110. The plurality of second protrusions 122 surround the first protrusion 121 in the circumferential direction, and the plurality of second protrusions 122 are spaced apart from each other in the circumferential direction. The plurality of third protrusions 123 surround the plurality of second protrusions 122 in the circumferential direction, and the plurality of third protrusions 123 are spaced apart from each other in the circumferential direction. The third protrusions 123, the second protrusions 122 and the first protrusion 121 are sequentially spaced apart in the radial direction.

[0091] In addition, the plurality of third protrusions 123 correspond to the plurality of second protrusions 122 one by one, and a certain radial interval is maintained between the corresponding second protrusion 122 and the third protrusion 123.

[0092] Exemplarily, both the second protrusion 122 and the third protrusion 123 are fan-shaped rings, and the third protrusion 123 is concentric with the second protrusion 122.

[0093] It can be understood that the supporting protrusion 120 forms a three-layer support structure. The multi-level support system helps to disperse the load between the support points, optimize the contact fit between the jig body 10 and the current collector plate 40, and reduce the risk of stress concentration.

[0094] According to some embodiments of the present application, referring to Figure 1 and Figure 3 , chamfers are provided on each edge of the end of the supporting protrusion 120 facing away from the bottom of the receiving groove 110.

[0095] Exemplarily, taking the end of the supporting protrusion 120 connected to the boss 150 as the lower end and the end of the supporting protrusion 120 facing away from the bottom of the receiving groove 110 as the upper end, the upper ends of the plurality of supporting protrusions 120 are flush with the notch of the receiving groove 110, and the lower ends of the plurality of supporting protrusions 120 are flush with the bottom of the receiving groove 110.

[0096] Chamfers are provided on each edge of the upper end of the supporting protrusion 120. The chamfers can make the contact surfaces of each edge smoother, thereby reducing the friction between the supporting protrusion 120 and the current collector plate 40 and reducing the risk of damage to the current collector plate 40.

[0097] According to some embodiments of the present application, referring to Figure 1 and Figure 4 , a guiding groove 160 is provided on the outer peripheral wall of the jig body 10.

[0098] The guide groove 160 is a concave structure used to guide the collecting plate fixture 1 to move smoothly or accurately position in the positioning brackets on both sides of the logistics line. Specifically, the collecting plate 40 is installed on the collecting plate fixture 1 at the loading station and then transported to the welding station through the logistics line. The logistics line is provided with positioning brackets on both sides, and the positioning brackets are installed with matching structures, which are used to extend into the guide groove 160.

[0099] Exemplarily, the shape of the guide groove 160 on the outer peripheral wall of the fixture body 10 includes but is not limited to a U-shape, a V-shape, or a straight groove.

[0100] According to some embodiments of the present application, referring to Figure 5 , Figure 5 for Figure 4 The outer wall of the fixture body 10 is provided with two symmetrically distributed guide grooves 160 at symmetrical positions.

[0101] The guide grooves 160 on the outer wall of the jig body 10 are symmetrically distributed. Specifically, the outer wall of the jig body 10 is provided with two symmetrically distributed guide grooves 160 at symmetrical positions, which can balance the guiding effect of the matching structures on both sides, reduce the risk of deflection or instability of the collecting plate jig 1 during transportation, and contribute to the smooth operation of the collecting plate jig 1.

[0102] When the collecting plate fixture 1 moves on the logistics line, the guide groove 160 faces both sides of the logistics line. The matching structures on both sides of the logistics line have the same length as the logistics line and extend into the corresponding guide grooves 160 respectively, so that the collecting plate fixture 1 does not rotate when moving on the logistics line.

[0103] It should be noted that the matching structures on both sides of the logistics line do not clamp the collecting plate fixture 1, and there is a gap between the matching structure and the bottom of the guide groove 160. When the collecting plate fixture 1 moves, the matching structure is stationary.

[0104] It is understandable that by providing the guide groove 160 on the outer peripheral wall of the fixture body 10 and cooperating with the positioning brackets on both sides of the transportation line, the stability of the collecting plate fixture 1 during transportation can be improved and the deviation or shaking of the collecting plate fixture 1 can be reduced.

[0105] According to some embodiments of the present application, referring to Figure 4 and Figure 5 The collecting plate fixture 1 also includes a positioning pin 20 , which is installed on the fixture body 10 and extends from the bottom of the accommodating groove 110 .

[0106] The positioning pin 20 is a mechanical component used to accurately position and fix the positions of components, having a certain shape and size so as to accurately cooperate with the positioning holes 410 on the manifold 40 or the fixture body 10, reducing the risk of the manifold 40 shifting in position during transportation, thereby reducing the processing errors caused by the position shift.

[0107] In this embodiment, a plurality of support protrusions 120 are provided on the boss 150, wherein the first protrusion 121 is located at the center of the receiving groove 110. The first protrusion 121 is annular and is used for the positioning pin 20 to pass through. The positioning pin 20 is installed on the fixture body 10 and is used to fix the manifold 40.

[0108] Specifically, the upper end of the first protrusion 121 is flush with the notch of the receiving groove 110, and the lower end of the first protrusion 121 is flush with the bottom of the receiving groove 110. The positioning pin 20 extends out from the bottom of the receiving groove 110, penetrates through the first protrusion 121, and extends beyond the notch of the receiving groove 110. When the manifold 40 is placed on the fixture body 10, the part of the positioning pin 20 extending beyond the notch of the receiving groove 110 passes through the circular hole at the center of the manifold 40, fixing the manifold 40 on the fixture body 10.

[0109] Exemplarily, the installation methods of the positioning pin 20 include but are not limited to threaded connection, plug-in connection, snap connection, etc.

[0110] In addition, the end of the positioning pin 20 extending out from the bottom of the receiving groove 110 is provided with a chamfer, which can be used to reduce the friction between components or guide the precise docking of workpieces, helping to reduce the risk of jamming or inaccurate position caused by the direct contact between the manifold 40 and the end of the positioning pin 20.

[0111] It can be understood that by providing the positioning pin 20 in the manifold fixture 1, the processing errors caused by the offset or inaccurate positioning of the manifold 40 can be reduced, thereby improving the production quality and efficiency.

[0112] According to some embodiments of the present application, referring to Figure 5 , the manifold fixture 1 further includes a mounting plate 30. The fixture body 10 is provided with a mounting groove 170 on the side opposite to the receiving groove 110. The bottom of the mounting groove 170 is provided with a through hole penetrating through to the receiving groove 110. The positioning pin 20 is installed in the mounting groove 170 and extends out from the receiving groove 110 through the through hole. The mounting plate 30 is installed in the mounting groove 170, and is adhesively bonded between the mounting plate 30 and the positioning pin 20 with glue.

[0113] In this embodiment, a receiving groove 110 is provided on one side of the jig body 10, and a mounting groove 170 is provided on the side opposite to the receiving groove 110. A through hole penetrating through to the receiving groove 110 is provided at the bottom of the mounting groove 170. The mounting groove 170 and the receiving groove 110 are communicated through the through hole. The positioning pin 20 is installed in the through hole, with one end located in the mounting groove 170 and the other end extending out of the receiving groove 110.

[0114] Specifically, the positioning pin 20 includes a first section and a second section, where the diameter of the first section is smaller than that of the second section. The first section extends from the bottom of the mounting groove 170 to the receiving groove 110, and the second section is located in the mounting groove 170, forming a stepped structure matching the mounting groove 170 and the through hole.

[0115] Exemplarily, the manufacturing material of the positioning pin 20 includes but is not limited to zirconia ceramics.

[0116] In addition, a hole retaining ring is provided on the side wall of the mounting groove 170. The end of the positioning pin 20 located in the mounting groove 170 abuts against the hole retaining ring, and the hole retaining ring can limit the axial movement of the positioning pin 20 and fix the positioning pin 20 in the mounting groove 170 and the through hole.

[0117] A mounting plate 30 is provided at the notch of the mounting groove 170. The mounting plate 30 and the positioning pin 20 are bonded by an adhesive such as quick-drying glue, and the side of the mounting plate 30 facing away from the positioning pin 20 is flush with the outer side of the jig body 10, so as to block the mounting groove 170 through the mounting plate 30.

[0118] Bonding the mounting plate 30 and the positioning pin 20 with glue can provide additional fixing force, increase the connection strength between the mounting plate 30 and the positioning pin 20, and can also simplify the installation process and improve production efficiency.

[0119] It can be understood that through the cooperation of the mounting groove 170, the through hole and the positioning pin 20, the positioning accuracy and stability of the current collector plate 40 can be improved, and the assembly process can be simplified by reducing traditional mechanical connection components, thereby improving production efficiency.

[0120] According to some embodiments of the present application, see Figures 1 - 5As shown, the present application provides a collector plate fixture 1, which includes a fixture body 10, the fixture body 10 forms a receiving groove 110, and the bottom wall of the receiving groove 110 forms a plurality of support protrusions 120 for supporting the collector plate 40, and the plurality of support protrusions 120 are arranged at intervals to form an escape space 130 for escaping the welding area of ​​the collector plate 40. The bottom of the receiving groove 110 is provided with an annular sink groove 140 to form a boss 150 located at the inner circle of the sink groove 140, and the support protrusion 120 is arranged on the boss 150. The supporting protrusion 120 includes: a first protrusion 121, a plurality of second protrusions 122 and a plurality of third protrusions 123, wherein the first protrusion 121 is located at the center of the receiving groove 110, the plurality of second protrusions 122 are circumferentially surrounded outside the first protrusion 121, the plurality of second protrusions 122 are circumferentially spaced apart from each other, the plurality of third protrusions 123 are circumferentially surrounded outside the plurality of second protrusions 122, the plurality of third protrusions 123 are circumferentially spaced apart from each other, and the third protrusions 123, the second protrusions 122 and the first protrusion 121 are sequentially spaced apart in the radial direction. In addition, the outer peripheral wall of the jig body 10 is provided with two symmetrically distributed guide grooves 160 at symmetrical positions. The fixture body 10 is provided with a mounting groove 170 on a side opposite to the receiving groove 110, and a through hole is provided at the bottom of the mounting groove 170 that penetrates the receiving groove 110. The positioning pin 20 is installed in the mounting groove 170 and extends from the receiving groove 110 through the through hole. The mounting groove 170 is also provided with a mounting plate 30, and the mounting plate 30 and the positioning pin 20 are connected by gluing. Each edge of the support protrusion 120 at one end away from the bottom of the receiving groove 110, and the end of the positioning pin 20 extending from the bottom of the receiving groove 110, can be provided with a chamfer.

[0121] According to some embodiments of the present application, referring to Figure 1 and Figure 2 The collecting plate 40 is carried using a collecting plate fixture 1. A positioning hole 410 is provided in the middle of the collecting plate 40. A plurality of welding lines 420 are formed on the connecting surface of the collecting plate 40 after welding. The plurality of welding lines 420 are distributed at intervals around the circumference of the positioning hole 410. The area where the plurality of welding lines 420 are located corresponds to the avoidance space 130.

[0122] In this embodiment, the battery cell generally includes a shell, an electrode assembly and a cover assembly. The shell is used to accommodate the electrode assembly. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The cover assembly is used to close the shell, and a pole is provided on the cover assembly. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0123] The current collector plate 40 mainly serves as a component for current collection and conduction in a battery cell, and is usually connected between the electrode assembly and the cover plate assembly. Specifically, the current collector plate 40 acts as a bridge between the electrode active material and the external circuit, collecting the current generated by the electrode assembly and conducting it to the terminal on the cover plate assembly to form a closed loop.

[0124] Exemplarily, the current collector plate 40 includes a positive current collector plate and a negative current collector plate. The positive current collector plate is usually an aluminum foil and is used to connect to the positive electrode tab in the electrode assembly. The negative current collector plate is usually a copper foil and is used to connect to the negative electrode tab in the electrode assembly.

[0125] The connection methods between the current collector plate 40 and the electrode assembly include but are not limited to welding, mechanical connection, conductive adhesive bonding, etc. Exemplarily, the current collector plate 40 can be connected to the electrode assembly by welding, and after welding, a welding wire 420 is formed on the current collector plate 40.

[0126] During the actual working process, the current collector plate 40 is installed on the current collector plate fixture 1 at the loading station, then transported to the welding station through the logistics line, and welded between the current collector plate 40 and the electrode assembly. It should be noted that the welding wire 420 is formed on the current collector plate 40 only after welding, and there is no welding wire 420 on the current collector plate 40 during the transportation process before welding.

[0127] In addition, the current collector plate 40 is carried by the current collector plate fixture 1, and a positioning hole 410 is provided in the middle of the current collector plate 40. The positioning hole 410 on the current collector plate 40 corresponds to the positioning pin 20 on the current collector plate fixture 1. When the current collector plate 40 is arranged on the current collector plate fixture 1, the positioning pin 20 penetrates through the positioning hole 410 to limit the relative movement between the current collector plate 40 and the current collector plate fixture 1 during transportation.

[0128] Multiple welding wires 420 are provided on the connection surface of the current collector plate 40, and the multiple welding wires 420 are spaced apart circumferentially around the positioning hole 410, thereby improving the uniformity of the current-carrying capacity of the current collector plate 40 after welding. Specifically, the arrangement of the welding wires 420 on the current collector plate 40 is based on the component welded to the current collector plate 40. For example, the electrode assembly consists of electrode tabs and a separator film, and the electrode tabs are welded to the current collector plate 40, and the electrode tabs are correspondingly distributed with the welding wires 420 on the current collector plate 40.

[0129] Multiple support protrusions 120 for supporting the current collector plate 40 are formed on the current collector plate fixture 1. The multiple support protrusions 120 are spaced apart to form an avoidance space 130 for avoiding the welding wires 420 of the current collector plate 40. The area where the multiple welding wires 420 are located corresponds to the avoidance space 130, thereby reducing the risk of scratching or contaminating the welding area on the surface of the current collector plate 40.

[0130] Specifically, the current collector plate 40 is arranged on the current collector plate fixture 1. A reserved part of the current collector plate 40 is used for welding. After welding, welding wires 420 are formed at the reserved positions. The areas where multiple welding wires 420 are located are correspondingly arranged with the avoidance space 130.

[0131] According to some embodiments of the present application, referring to Figure 2 , the center of the current collector plate 40 is collinear with each welding wire 420, and each welding wire 420 is spaced apart from the positioning hole 410 and the outer peripheral edge of the current collector plate 40.

[0132] A positioning hole 410 is provided in the middle of the current collector plate 40. The center of the current collector plate 40 is the center of the circle of the positioning hole 410. Multiple welding wires 420 are distributed at intervals along the circumferential direction of the positioning hole 410, which can reduce the electrical interference between different welding wires 420. And the center of the current collector plate 40 is collinear with each welding wire 420, and the extension lines of each welding wire 420 intersect at the center of the current collector plate 40. This arrangement can make the current distribution of the welding wires 420 more uniform.

[0133] In addition, each welding wire 420 is spaced apart from the positioning hole 410 and the outer periphery of the current collector plate 40 at the same time, which can improve the stability of the welding points and the reliability of the welding process, reduce the risk of excessive bending of the welding wires 420 or contact with the outer periphery of the current collector plate 40, and thus reduce the short - circuit risk.

[0134] It can be understood that through reasonable geometric arrangement, the stability of welding can be improved, the probability of faults can be reduced, and thus the current transmission efficiency can be improved.

[0135] According to some embodiments of the present application, referring to Figure 2 , multiple welding wires 420 include multiple first welding wires 421 and multiple second welding wires 422. The length of the first welding wire 421 is greater than the length of the second welding wire 422, and the multiple first welding wires 421 and the multiple second welding wires 422 are arranged in a staggered manner one by one.

[0136] Multiple welding wires 420 are distributed at intervals along the circumferential direction of the positioning hole 410. Among them, multiple welding wires 420 include multiple first welding wires 421 and multiple second welding wires 422, and the multiple first welding wires 421 and the multiple second welding wires 422 are arranged in a staggered manner one by one. The staggered arrangement of the welding wires 420 helps to optimize and utilize the space on the current collector plate 40, enables each welding wire 420 to be orderly distributed in the limited space, thereby reducing the current loss in the local area. The staggered welding wires 420 also help to evenly dissipate heat and reduce the thermal damage caused by local overheating.

[0137] The multiple welding wires 420 are divided into multiple groups distributed at intervals along the circumferential direction. Each group of welding wires 420 includes two first welding wires 421 and one second welding wire 422. Within the same group of welding wires 420, the second welding wire 422 is located between the two first welding wires 421 along the circumferential direction.

[0138] Specifically, the extension lines of the bonding wires 420 all intersect at the center of the current collector plate 40. Within the same group of bonding wires 420, the included angles formed by the extension lines of adjacent bonding wires 420 at the center of the current collector plate 40 are the same.

[0139] Exemplarily, as Figure 2 shown, within the same group of bonding wires 420, the first included angle α formed by the extension lines of adjacent bonding wires 420 at the center of the current collector plate 40 is 15°, that is, the first included angle α formed by the extension lines of the first bonding wire 421 and the second bonding wire 422 within the same group of bonding wires 420 is 15°, and the included angle formed by the extension lines of two first bonding wires 421 within the same group of bonding wires 420 is 30°.

[0140] Specifically, the extension lines of the bonding wires 420 all intersect at the center of the current collector plate 40. Among different groups of bonding wires 420, the included angles formed by the extension lines of adjacent bonding wires 420 at the center of the current collector plate 40 are the same.

[0141] Exemplarily, as Figure 2 shown, among adjacent groups of bonding wires 420, the second included angle β formed by the extension lines of adjacent bonding wires 420 at the center of the current collector plate 40 is 60°, that is, the second included angle β formed by the extension lines of the closest first bonding wire 421 among adjacent groups of bonding wires 420 is 60°, and the included angle formed by the extension lines of the second bonding wires 422 in two adjacent groups of bonding wires 420 is 90°.

[0142] In addition, the current collector plate 40 is welded to the electrode assembly, and bonding wires 420 are formed on the current collector plate 40. The length of the first bonding wire 421 is greater than the length of the second bonding wire 422, and the length difference can cover different welding areas on the electrode assembly. Among them, the coverage range of the first bonding wire 421 is wider, and the welding area with the pole piece is larger, which is used to bear more current. Moreover, the shortest distances from the ends of the first bonding wire 421 and the second bonding wire 422 far from the center of the current collector plate 40 to the outer peripheral edge of the current collector plate 40 are equal, that is, the second bonding wire 422 is close to the outer edge of the current collector plate 40, so as to be electrically connected to the peripheral area of the electrode assembly.

[0143] It can be understood that the staggered arrangement of multiple bonding wires 420 with different lengths can effectively optimize the current distribution, reduce the current loss, and improve the electrical performance and welding stability.

[0144] According to some embodiments of the present application, referring to Figure 2 , the distance from one of the multiple second bonding wires 422 to the center of the current collector plate 40 is different from the distances from the other second bonding wires 422 to the center of the current collector plate 40.

[0145] A plurality of bonding wires 420 are circumferentially spaced apart around the positioning hole 410. The plurality of bonding wires 420 include a plurality of first bonding wires 421 and a plurality of second bonding wires 422. The included angle formed by the extension lines of adjacent second bonding wires 422 is 90°. And the total length of all the bonding wires 420 on the current collector plate 40 is at least greater than 90 mm, so that the current-carrying capacity reaches the expectation.

[0146] Specifically, the lengths of the plurality of second bonding wires 422 are the same. The distance from one of the plurality of second bonding wires 422 to the center of the current collector plate 40 is different from the distances from the other second bonding wires 422 to the center of the current collector plate 40. The distance from this second bonding wire 422 to the outer edge of the current collector plate 40 is also different from the distances from the other second bonding wires 422 to the outer edge of the current collector plate 40.

[0147] It should be noted that, except for the second bonding wire 422 with a different distance to the center of the current collector plate 40, the distances from the ends of all the other bonding wires 420 on the current collector plate 40 away from the center of the current collector plate 40 to the outer edge of the current collector plate 40 are the same. The fact that the distance from one of the plurality of second bonding wires 422 to the center of the current collector plate 40 is different can be used for marking to clarify the starting area of welding, which is convenient for subsequent fault detection.

[0148] If there is no special instruction, all the embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0149] If there is no special instruction, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0150] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A collector plate fixture, characterized in that: include: A fixture body, forming a receiving groove, a bottom wall of the receiving groove forming a plurality of supporting protrusions for supporting the current collecting plate, the plurality of supporting protrusions being arranged at intervals to form an avoidance space for avoiding the welding area on the surface of the current collecting plate; The bottom of the receiving groove is sunken downward to form an annular groove, and a boss located at the inner circle of the groove is correspondingly formed, and the supporting protrusion is arranged on the boss.

2. The collector plate fixture according to claim 1, characterized in that: The supporting protrusion comprises: A first protrusion, located at the center of the receiving groove; A plurality of second protrusions surround the first protrusion in the circumferential direction, and the second protrusions are spaced apart from the first protrusion in the radial direction, and the plurality of second protrusions are spaced apart from each other in the circumferential direction.

3. The collector plate fixture according to claim 2, characterized in that: The support protrusion also includes: A plurality of third protrusions are circumferentially arranged around the plurality of second protrusions, and the third protrusions are radially spaced apart from the second protrusions, and the plurality of third protrusions are circumferentially spaced apart from each other.

4. The collector plate fixture according to claim 1, characterized in that: Each edge of the supporting protrusion at one end away from the groove bottom of the accommodating groove is provided with a chamfer.

5. The collector plate fixture according to any one of claims 1 to 4, characterized in that: The outer peripheral wall of the fixture body is provided with a guide groove.

6. The collector plate fixture according to claim 5, characterized in that: The outer peripheral wall of the fixture body is provided with two symmetrically distributed guide grooves at symmetrical positions.

7. The collector plate fixture according to claim 1, characterized in that: The collecting plate fixture further includes: a positioning pin, which is installed on the fixture body and extends from the bottom of the accommodating groove.

8. The collector plate fixture according to claim 7, characterized in that: The end of the positioning pin extending out of the groove bottom of the accommodating groove is chamfered.

9. The collector plate fixture according to claim 7, characterized in that: The collecting plate fixture also includes: a mounting plate, the fixture body is provided with a mounting groove on a side opposite to the accommodating groove, the bottom of the mounting groove is provided with a through hole penetrating to the accommodating groove, the positioning pin is installed in the mounting groove and extends from the accommodating groove through the through hole, the mounting plate is installed in the mounting groove, and the mounting plate and the positioning pin are connected by gluing.

10. A current collecting plate, characterized in that: The collecting plate is carried using a current collecting plate fixture as described in any one of claims 1 to 9, wherein a positioning hole is provided in the middle of the collecting plate, and a plurality of welding lines are formed after welding the connecting surface of the collecting plate, and the plurality of welding lines are distributed at intervals around the circumference of the positioning hole, and the area where the plurality of welding lines are located is arranged corresponding to the avoidance space.

11. The collecting plate according to claim 10, characterized in that: The center of the current collecting plate is colinearly arranged with each of the welding lines, and each of the welding lines is spaced apart from the positioning hole and the outer peripheral edge of the current collecting plate.

12. The collecting plate according to claim 10, characterized in that: The plurality of welding wires include a plurality of first welding wires and a plurality of second welding wires, the length of the first welding wires is greater than the length of the second welding wires, and the plurality of first welding wires and the plurality of second welding wires are arranged one by one in an alternating manner.

13. The collecting plate according to claim 12, characterized in that: A distance from one of the plurality of second welding lines to the center of the current collecting disk is different from a distance from the other second welding lines to the center of the current collecting disk.

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