Collector plate welding fixture

Abstract

The utility model relates to the technical field of battery welding fixtures, in particular to a collector plate welding fixture. Comprising a lower clamp, a mounting area of the lower clamp is provided with a plurality of attaching ribs used for being attached to a collector plate located on the upper portion, and the heights of the attaching ribs are gradually reduced from the center of the mounting area to the edge of the mounting area. According to the utility model, the fitting ribs with high middle parts and low edges are arranged to correspond to the shape of thick edge and thin center of the end surface of the roll core flattened by the tab, so that the tight fitting of the current collecting disc and the roll core is ensured, and the problems of offset welding and insufficient welding caused by fitting gaps in the welding process of the current collecting disc are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery welding jigs, and particularly relates to a current collector welding jig. Background Art

[0002] At present, large cylindrical batteries adopt the full-tab technology to improve the fast charging performance and increase the heat dissipation area. The tab is a metal conductor that leads out the positive and negative electrodes from the cylindrical battery cell respectively. The main components are aluminum and copper, and it is the contact point for the battery to charge and discharge. The full-tab technology changes the horizontal transmission path of electrons from the tab to the current collector to the longitudinal transmission of the current collector, shortens the electron flow path, increases the heat dissipation area of the tab end face, reduces the heat generation, and enhances the thermal stability of the battery; at the same time, the full-tab design reduces the internal resistance of the battery, improves the electron flow speed, and improves the fast charging performance.

[0003] The core of the large-scale production and application of full-tab cylindrical batteries lies in achieving full-area welding of the current collector and the current collector plate, and the positive and negative electrode covers through laser welding. As the diameter of the wound core increases, the number of tabs per turn gradually increases, posing higher requirements for the welding accuracy, quality, and consistency. In the prior art, there are processes such as tab die-cutting and flattening, and current collector plate welding; especially the current collector plate welding process directly affects the yield rate of large cylindrical batteries, resulting in difficulties in large-scale production of batteries.

[0004] In the prior art, after the full-tab cylindrical battery cell is wound, a tab flattening process is carried out. Since the winding of the cylindrical wound core satisfies the Archimedes spiral principle, the number of tabs in the outer circle becomes more as the size increases. Therefore, the number of stacked layers of tabs on the end face of the entire wound core is inconsistent, and the tabs are distributed with fewer in the center and more at the edge. The end face of the wound core with flattened tabs has a shape of thick at the edge and thin in the center. In the prior art, the current collector plate welding tooling fixture is not designed according to the tab distribution law, and there are still problems such as inaccurate welding positioning, insufficient pressing of the pressure head, and easy occurrence of offset welding and virtual welding during the current collector plate welding process, resulting in a large number of scraps in the production process and seriously affecting the trial production yield rate. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a current collector plate welding jig to solve the above technical problems;

[0006] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0007] A current collector plate welding jig, characterized in that it includes a lower jig, and a plurality of fitting ribs for fitting the current collector plate located above are provided on the fitting area of the lower jig, and the height of the fitting ribs gradually decreases from the center of the fitting area to the edge of the fitting area.

[0008] Preferably, the pasting area is a groove or a through hole, the bonding rib is arranged in the pasting area, and the bonding rib is a strip structure extending from the center of the pasting area to the edge of the pasting area.

[0009] Preferably, positioning blocks corresponding to the positioning grooves of the current collector plate are arranged on at least a part of the bonding ribs.

[0010] Preferably, it further includes a support block for supporting the current collector plate, and the support block is connected to the inner surface of the side wall of the pasting area.

[0011] Preferably, the bonding ribs provided with the positioning blocks and the bonding ribs not provided with the positioning blocks are arranged alternately, and one support block is arranged between every two adjacent bonding ribs.

[0012] Preferably, the pasting area is a circular structure adapted to the current collector plate of the cylindrical battery, and the bonding ribs are uniformly distributed along the radius of the circle where the pasting area is located.

[0013] Preferably, the current collector plate has a certain flexibility.

[0014] Preferably, it further includes an upper clamp detachably connected to the lower clamp, and the upper clamp is provided with an opening corresponding to the pasting area.

[0015] Preferably, a protection air duct is arranged in the upper clamp, the air outlet of the protection air duct is communicated with the side wall of the opening, and the air inlet of the protection air duct is arranged on the outer side surface of the upper clamp.

[0016] Preferably, the lower clamp is provided with a first fixing hole, and the upper clamp is provided with a second fixing hole corresponding to the first fixing hole.

[0017] The beneficial effects of the present utility model: Due to the adoption of the above technical solutions, by arranging the bonding ribs with a high middle and a low edge, the present utility model corresponds to the shape of the edge of the end face of the wound core with flattened tabs being thick and the center being thin, thereby ensuring the tight fitting of the current collector plate and the wound core, and avoiding problems such as welding deviation and false soldering caused by gaps in the fitting during the welding process of the current collector plate. Description of the Drawings

[0018] Figure 1 It is a top view of the lower clamp in the embodiment of the present utility model;

[0019] Figure 2 It is a side view of the bonding rib provided with the positioning block in the embodiment of the present utility model;

[0020] Figure 3 It is a top view of the current collector plate in the embodiment of the present utility model;

[0021] Figure 4This is the top view of the upper fixture in the embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the end face of the core for flattening the tab in the embodiment of the present utility model.

[0023] In the drawings: 1, lower fixture; 2, pasting area; 3, current collector plate; 4, bonding rib; 5, positioning groove; 6, positioning block; 7, support block; 8, upper fixture; 9, opening; 10, protection air duct; 11, first fixing hole; 12, second fixing hole; 13, end face of the core; 14, welding area. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0026] Next, the present utility model will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present utility model.

[0027] A current collector plate welding fixture, as Figures 1 to 5 shown, includes a lower fixture 1. A plurality of bonding ribs 4 for bonding the current collector plate 3 located above are provided on the pasting area 2 of the lower fixture 1. The height of the bonding ribs 4 gradually decreases from the center of the pasting area 2 to the edge of the pasting area 2.

[0028] Specifically, the present utility model provides a current collector plate welding fixture to solve the problems of inaccurate welding positioning, gaps between the current collector plate 3 and the core, and welding deviation and false welding in the prior art.

[0029] After the winding of the all-tab cylindrical battery cell, the tab flattening process is carried out, and the tabs extend along the edge of the electrode sheet. Since the electrode sheet is wound according to the Archimedes spiral, that is, an equidistant spiral, its spacing and length are evenly distributed in the radial direction. Therefore, the closer to the winding center of the battery cell, the fewer the number of tabs; the closer to the winding edge of the battery cell, the more the number of tabs. After flattening, due to the uneven number of tabs, the number of stacked layers of the tabs at the edge is large, and the number of stacked layers of the tabs in the center is small. Thus, the rolled core end face 13 after tab flattening has the characteristics of thick edge and thin center. The present utility model provides a fitting rib 4 with a height gradually decreasing from the center to the edge of the mounting area 2. The shape of the fitting rib 4 is high in the middle and low at the edge, which can correspond to the shape of the thick edge and thin center of the rolled core end face 13 after tab flattening, thereby ensuring the fitting of the current collector plate 3 and the rolled core, and avoiding problems such as inaccurate welding positioning, insufficient pressing by the pressure head, resulting in offset welding and virtual welding during the welding of the current collector plate 3, which may cause battery scrapping.

[0030] Further specifically, the clamping structure of the present utility model is that the current collector plate 3 is arranged on the lower fixture 1, the center of the current collector plate 3 is aligned with the center of the mounting area 2, and the current collector plate 3 is arranged on the fitting rib 4. At this time, the current collector plate 3 is a plane, and the upper part of the fitting rib 4 is an inclined surface that is high at the center of the mounting area 2 and low at the edge of the mounting area 2. Therefore, the current collector plate 3 only contacts the higher side of the fitting rib 4, and there is a certain gap between the lower side of the current collector plate 3 and the fitting rib 4.

[0031] Then, the rolled core after tab flattening is vertically arranged on the current collector plate 3, and the rolled core is pressed down by an external pressing mechanism to be closely attached to the current collector plate 3. Since the rolled core end face 13 after tab flattening has a structure of thick edge and thin center, after pressing down, the current collector plate 3 will produce a small deformation under the pressure, so that the current collector plate 3 and the fitting rib 4 are fitted together, thereby achieving the effect of good fitting between the current collector plate 3 and the rolled core end face 13 after tab flattening, which is convenient for subsequent stable welding.

[0032] In a preferred embodiment, the mounting area 2 is a groove or a through hole, the fitting rib 4 is arranged in the mounting area 2, and the fitting rib 4 is a strip-shaped structure extending from the center of the mounting area 2 to the edge of the mounting area 2.

[0033] Specifically, the mounting area 2 of the present utility model is provided with a hollow structure, the fitting rib 4 is arranged in the mounting area 2, a side wall protruding relative to the surface of the lower fixture 1 is provided at the edge of the mounting area 2, and the height of the fitting rib 4 exceeds the thickness of the lower fixture 1.

[0034] In a preferred embodiment, at least a part of the fitting rib 4 is provided with a positioning block 6 corresponding to the positioning groove 5 of the current collector plate 3.

[0035] Specifically, in the present utility model, a welding area 14 for connecting the core is provided on the current collector plate 3. Taking a cylindrical battery as an example, it uses a circular current collector plate 3. The positioning grooves 5 on the current collector plate 3 are evenly distributed at the radius of the circle where the current collector plate 3 is located, separating the welding area 14. The height and thickness of the positioning blocks 6 are both adapted to the positioning grooves 5. In this embodiment, it is preferably set to have 3 positioning grooves 5, with a 120° interval between each positioning groove 5, and the welding area 14 is fan-shaped.

[0036] In a preferred embodiment, it further includes a support block 7 for supporting the current collector plate 3, and the support block 7 is connected to the inner surface of the side wall of the pasting area 2.

[0037] Specifically, the support block 7 is arranged at the edge position of the pasting area 2 for supporting the edge of the current collector plate 3. The surface of the support block 7 is a flat surface. Through the bearing capacity provided by the support block 7, it assists in controlling the position of the current collector plate 3, and ensures the close fit between the current collector plate 3 and the core during subsequent welding, improving the welding quality.

[0038] In a preferred embodiment, the bonding ribs 4 with positioning blocks 6 and the bonding ribs 4 without positioning blocks 6 are arranged alternately, and a support block 7 is provided between each adjacent pair of bonding ribs 4.

[0039] In a preferred embodiment, the pasting area 2 is a circular structure adapted to the current collector plate 3 of the cylindrical battery, and the bonding ribs 4 are evenly distributed at the radius of the circle where the pasting area 2 is located.

[0040] Specifically, taking a cylindrical battery as an example, the pasting area 2 is a corresponding circular area. There are a total of 6 bonding ribs 4 on the pasting area 2, and each bonding rib 4 is arranged on the radius of the circular area, with a 60° interval between each other. Among them, it includes 3 bonding ribs 4 with positioning blocks 6 and 3 bonding ribs 4 without positioning blocks 6. The 3 bonding ribs 4 with positioning blocks 6 respectively correspond to the 3 positioning grooves 5 in the above embodiment, and the bonding ribs 4 with positioning blocks 6 and the bonding ribs 4 without positioning blocks 6 are arranged alternately.

[0041] Since the subsequent welding uses a laser welding method and the welding points are fixed points, the positioning method of the present utility model can ensure the accurate positioning of the current collector plate 3, ensure the correct alignment between the current collector plate 3 and the core, avoid welding deviation and false soldering. The uniform arrangement of the bonding ribs 4 can also enable the current collector plate 3 to form a good fit with the end face 13 of the core with the tabs flattened, reducing the occurrence of partial welding and false soldering, and improving the overall welding quality.

[0042] In a preferred embodiment, the current collector plate 3 has a certain flexibility.

[0043] Specifically, the wound core after flattening the tab is vertically arranged on the current collector plate 3, and the wound core is pressed down by an external pressing mechanism to be closely attached to the current collector plate 3. Since the end face 13 of the wound core with the flattened tab has a structure with a thick edge and a thin center, after pressing down, the current collector plate 3 will produce a slight deformation, so that the current collector plate 3 and the fitting rib 4 are in contact with each other, and the current collector plate 3 is in good contact with the end face 13 of the wound core with the flattened tab, which is convenient for subsequent stable welding.

[0044] In a preferred embodiment, it further includes an upper fixture 8, which is detachably connected to the lower fixture 1, and the upper fixture 8 is provided with an opening 9 corresponding to the pasting area 2.

[0045] In a preferred embodiment, a protective air duct 10 is provided in the upper fixture 8. The air outlet of the protective air duct 10 is communicated with the side wall of the opening 9, and the air inlet of the protective air duct 10 is arranged on the outer side surface of the upper fixture 8.

[0046] Specifically, the upper fixture 8 is connected to the lower fixture 1, and the current collector plate 3 and the wound core are exposed to the outside through the opening 9. During the welding process, the protective gas enters from the air inlet and passes through the air outlet into the inside of the opening 9, providing a protective gas environment during the welding process to ensure stability during welding.

[0047] In a preferred embodiment, the lower fixture 1 is provided with a first fixing hole 11, and the upper fixture 8 is provided with a second fixing hole 12 corresponding to the first fixing hole 11.

[0048] Specifically, there are 4 first fixing holes 11, which are respectively located at the upper left corner, lower left corner, upper right corner and lower right corner of the lower fixture 1. The second fixing hole 12 and the first fixing hole 11 are arranged correspondingly. In the present invention, the second fixing hole 12 is a fixing screw hole, and the upper fixture 8 and the lower fixture 1 are detachably connected and fixed by screwing through the second fixing hole 12 and the first fixing hole 11.

[0049] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A collector plate welding fixture, characterized in that: The invention comprises a lower clamp (1), wherein a mounting area (2) of the lower clamp (1) is provided with a plurality of bonding ribs (4) for bonding a current collecting plate (3) located above, and the height of the bonding ribs (4) gradually decreases from the center of the mounting area (2) to the edge of the mounting area (2).

2. The collector plate welding fixture according to claim 1, characterized in that: The mounting area (2) is a groove or a through hole, the bonding rib (4) is arranged in the mounting area (2), and the bonding rib (4) is a strip structure extending from the center of the mounting area (2) to the edge of the mounting area (2).

3. The collector plate welding fixture according to claim 1, characterized in that: At least a portion of the fitting ribs (4) are provided with positioning blocks (6) corresponding to the positioning grooves (5) of the current collecting plate (3).

4. The collector plate welding fixture according to claim 3, characterized in that: It also comprises a support block (7) for supporting the current collecting plate (3), wherein the support block (7) is connected to the inner surface of the side wall of the mounting area (2).

5. The collector plate welding fixture according to claim 4, characterized in that: The laminating ribs (4) provided with the positioning blocks (6) and the laminating ribs (4) not provided with the positioning blocks (6) are arranged alternately, and one supporting block (7) is provided between each adjacent laminating rib (4).

6. The current collecting plate welding fixture according to claim 1, characterized in that: The mounting area (2) is a circular structure that matches the current collecting plate (3) of the cylindrical battery, and the fitting ribs (4) are evenly distributed with a radius of the circle where the mounting area (2) is located.

7. The current collecting plate welding fixture according to claim 1, characterized in that: The collecting plate (3) has a certain flexibility.

8. The current collecting plate welding fixture according to claim 1, characterized in that: It also comprises an upper clamp (8) which is detachably connected to the lower clamp (1), and the upper clamp (8) is provided with an opening (9) corresponding to the mounting area (2).

9. The current collecting plate welding fixture according to claim 8, characterized in that: A protective air duct (10) is provided in the upper clamp (8), an air outlet of the protective air duct (10) is communicated with the side wall of the opening (9), and an air inlet of the protective air duct (10) is provided on the outer side surface of the upper clamp (8).

10. The current collecting plate welding fixture according to claim 8, characterized in that: The lower clamp (1) is provided with a first fixing hole (11), and the upper clamp (8) is provided with a second fixing hole (12) corresponding to the first fixing hole (11).

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