Current collector plate and pole post welding assembly and tooling therefor

Abstract

The utility model relates to a kind of current collection disc welding assemblies, especially a kind of current collection disc and pole welding assembly and its tooling, wherein assembly includes current collection disc and pole, and the welding surface of current collection disc and pole has closed helical line welding track;Wherein tooling includes locating block, the first recess of the locating block has accommodating current collection disc, and the first recess is further provided with the second recess for accommodating pole;Press block, the press block is set on the top of locating block, and can be close to or away from locating block, and the side of the press block facing locating block is provided with a circle of protrusion.Welding, pole is placed into second recess, current collection disc is placed into first recess, press block is moved down, and current collection disc and pole are relatively fixed by protrusion.The utility model uses closed helical welding track, meets the length requirement of welding track, not only guarantees welding firm, welding efficiency is high, current collection disc is small in deformation, also guarantees that battery charge-discharge temperature rise meets standard.

Description

Technical Field

[0001] This utility model relates to a manifold welding assembly, and more particularly to a manifold and pole welding assembly and its tooling. Background Technology

[0002] Currently, large cylindrical batteries use various electrode mounting methods, which fix the electrode and current collector relatively by welding. If the technical requirements between the electrode and current collector cannot be guaranteed during the welding process, various defects will occur: (1) Weak welding will lead to desoldering during subsequent assembly and production, resulting in the scrapping of the battery cell; (2) Insufficient welding contact area will cause the battery cell to overheat during charging and discharging, affecting the battery cell's lifespan and charging and discharging safety.

[0003] Laser welding is a common method for welding terminals and current collectors, achieving current transfer in the battery by forming a strong laser weld joint between the terminals and current collectors. For production efficiency, a shorter welding trajectory results in higher efficiency, but this also requires consideration of the temperature rise during charging and discharging of the battery after welding.

[0004] Appendix Figure 1 and attached Figure 2 Two common welding trajectories for current collectors and terminals are disclosed respectively, with appendices. Figure 1 For the welding trajectory of three concentric circles, attached Figure 2 This shows the welding trajectory of a spiral and a circle. (Attached) Figure 1 and attached Figure 2 The welding trajectory shown is firm and reliable, and the temperature rise of the battery during charging and discharging also meets the standard. However, there are two problems in the welding production process: (1) low welding efficiency; (2) large heat output after welding, which leads to uncontrollable deformation of the collector plate.

[0005] Therefore, a new welding trajectory needs to be designed. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model provides a welding assembly for the manifold and the pole and its tooling, which is used to improve the welding effect of the manifold and the pole.

[0007] One objective of this invention is to provide a current collector and electrode welding assembly, comprising a current collector and an electrode, wherein the welding surfaces of the current collector and the electrode have a closed spiral welding trajectory. The spiral welding trajectory includes a spiral segment and a curved segment, wherein the beginning of the curved segment connects to the end of the spiral segment, and the beginning and end of the curved segment are connected.

[0008] Compared to the welding trajectory in existing technologies (see attached diagram) Figure 1 and attached Figure 2 The welding trajectory in this plan (see attached diagram) Figure 3 This design satisfies the temperature rise requirements for battery charging and discharging while ensuring welding efficiency, reducing heat output during welding, minimizing product deformation, and improving welding yield. To verify the welding effect of this trajectory, a post-weld tear test was performed, and the results were satisfactory.

[0009] The second objective of this utility model is to provide a welding fixture for a manifold and a pole, which can weld, but is not limited to, the aforementioned closed spiral welding trajectory.

[0010] Specifically, the welding fixture includes a positioning block, which has a first recess for accommodating a collector plate, and the first recess is further provided with a second recess for accommodating an electrode post.

[0011] A pressure block is positioned above the positioning block and can be close to or away from the positioning block. A ring of protrusions is provided on the side of the pressure block facing the positioning block.

[0012] During welding, the electrode post is placed into the second recess, the collector plate is placed into the first recess, the pressure block is moved down, and the collector plate and electrode post are fixed relative to each other by the protrusion.

[0013] The pressure block has a first channel for introducing shielding gas. The entire welding system is equipped with a shielding gas device, and an inlet connector is connected at the entrance of the first channel to introduce shielding gas. Commonly used shielding gases in welding include inert gases such as argon or helium, and reactive gases such as carbon dioxide or nitrogen. Shielding gas devices and shielding gases are not discussed in this solution. Shielding gas plays a crucial role in the welding process by isolating harmful components in the air and protecting the reaction zone or molten metal from contamination, thereby ensuring process quality and product performance. It is a commonly used technical means in welding.

[0014] The pressure block has a through welding groove, the inlet of the first flow channel is located on the first side of the pressure block, and the outlet of the first flow channel is located on the side wall of the welding groove.

[0015] One end of the welding groove is connected to a T-shaped pipe, which is connected to the second side of the pressure block; the first port of the T-shaped pipe is connected to the welding groove, the second port of the T-shaped pipe is connected to the cooling system, and the welding torch extends into the welding groove through the third port of the T-shaped pipe.

[0016] The first recesses are arranged in a spaced array along the first direction of the positioning blocks, and the positioning blocks are integrally formed; the pressure blocks correspond one-to-one with the first recesses. That is, in the welding fixture, multiple pressure blocks correspond to one positioning block.

[0017] The positioning block is provided with a second flow channel. The inlet of the second flow channel is located on the first side of the positioning block, and the outlet of the second flow channel is connected to the first recess and the second recess of the positioning block, respectively. After welding, debris will be generated. Since the first and second recesses are lower than the surface of the positioning block, it is not easy to clean the debris. Therefore, high-pressure gas is injected into the second flow channel by an air gun to blow the debris away from the first and second recesses.

[0018] This utility model has the following technical effects:

[0019] 1. This solution adopts a closed spiral welding trajectory that differs from existing technologies, which meets the welding trajectory length requirements. This not only ensures strong welding, high welding efficiency, and small deformation of the current collector, but also ensures that the battery charging and discharging temperature rise meets the standards.

[0020] 2. During the welding production of the manifold, the pole and the manifold are positioned by the positioning block to ensure the concentricity of the parts after welding. The pressure block is connected to the cooling system to ensure that the deformation of the manifold is controlled during the welding process. At the same time, the input of protective gas ensures that the product is not oxidized during the welding process. Attached Figure Description

[0021] Figure 1 This is one of the common welding trajectories in existing technologies;

[0022] Figure 2 This is one of the most common welding trajectories in existing technologies;

[0023] Figure 3 This is an example of the welding trajectory in this scheme;

[0024] Figure 4 This is a schematic diagram of the welding fixture in this scheme;

[0025] Figure 5 This is a schematic diagram of the positioning block in this scheme;

[0026] Figure 6 This is a schematic diagram of the pressure block in this scheme.

[0027] 100. Collector disk;

[0028] 200, pole;

[0029] 300. Spiral welding trajectory; 301. Spiral segment; 302. Curved segment;

[0030] 400. Positioning block; 401. First recess; 402. Second recess; 403. Second flow channel

[0031] 500, pressure block; 501, protrusion; 502, first flow channel; 503, welding groove;

[0032] 600, T-joint; 601, First port; 602, Second port; 603, Third port. Detailed Implementation

[0033] The principles and features of this utility model are described below with reference to the embodiments and the accompanying drawings; the examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0034] The first direction is attached. Figure 5 The X direction in the equation.

[0035] A current collector and electrode welding assembly includes a current collector 100 and an electrode 200, wherein the welding surfaces of the current collector 100 and the electrode 200 have a closed spiral welding trajectory 300. The spiral welding trajectory (300) includes a spiral segment 301 and a curved segment 302, wherein the beginning of the curved segment 302 connects to the end of the spiral segment 301, and the beginning and end of the curved segment 302 are connected. Thus, the following (not limited to) embodiments can be formed. Example

[0036] See attached document Figure 3 In this embodiment, the curved segment 302 is nearly circular, and the tail end of the spiral segment 301 is connected to the curved segment 302. Example

[0037] In this embodiment, the curved segment 302 is nearly elliptical, and the tail end of the spiral segment 301 is connected to the curved segment 302. Example

[0038] In this embodiment, the curved segment 302 is irregular in shape, and the tail end of the spiral segment 301 is connected to the curved segment 302.

[0039] A welding fixture for a current collector and an electrode post includes a positioning block 400 and a pressing block 500. The positioning block 400 has a plurality of first recesses 401 arranged in an array along a first direction and is integrally formed. Each recess 401 corresponds to a pressing block 500. The pressing block 500 is positioned above the positioning block 400. The pressing block 500 can be close to or away from the positioning block 400. The driving method of the pressing block 500 is not specifically limited in this solution and belongs to the prior art. Its structure is shown in the attached figure. Figure 6 As shown. The first recess 401 is a circular groove, and a second recess 402, which is a stepped hole, is provided at the center of the first recess 401. The first recess 401 is used to accommodate the collector plate 100, and the second recess 402 is used to accommodate the pole post 200. The first recess 401 and the second recess 402 are concentrically arranged to ensure the accurate positioning of the collector plate 100 and the pole post 200.

[0040] The pressure block 500 has a ring of protrusions 501 on the side facing the positioning block 400. The pressure block 500 moves downward toward the positioning block 400 and fixes the collector plate 100 and the pole post 200 relative to each other through the protrusions 501.

[0041] The pressure block 500 is square and has a through welding groove 503. The inlet of the first flow channel 502 is located on the first side of the pressure block 500, and a pipe joint is connected to the inlet of the first flow channel 502 for connection to the shielding gas system. In this embodiment, nitrogen is used as the shielding gas to prevent oxidation during the welding process. The outlet of the first flow channel 502 is located on the side wall of the welding groove 503.

[0042] One end of the welding groove 503 is connected to a tee pipe 600, which is connected to the second side of the pressure block 500; the first port 601 of the tee pipe 600 is connected to the welding groove 503, the second port 602 of the tee pipe 600 is connected to the cooling system, and the welding torch extends into the welding groove 503 through the third port 603 of the tee pipe 600.

[0043] The positioning block 400 is provided with a second flow channel 401. The inlet of the second flow channel 401 is located on the first side of the positioning block 400, and the outlet of the second flow channel 402 is connected to the first recess 401 and the second recess 402 of the positioning block 400, respectively. The second flow channel 402 is designed to clean the first recess 401 and the second recess 402. The first recess 401 and the second recess 402 can be cleaned by injecting high-pressure gas into the second flow channel 402 using an air gun.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A current collector and electrode welding assembly, comprising a current collector (100) and an electrode (200), characterized in that, The welding surfaces of the collector plate (100) and the pole post (200) have a closed spiral welding trajectory (300); the spiral welding trajectory (300) includes a spiral segment (301) and a curved segment (302), the beginning of the curved segment (302) is connected to the end of the spiral segment (301), and the beginning and end of the curved segment (302) are connected.

2. A welding fixture for a current collector and an electrode post, characterized in that, include: The positioning block (400) has a first recess (401) for accommodating the collector plate (100), and the first recess (401) is further provided with a second recess (402) for accommodating the pole post (200). A pressure block (500) is disposed above the positioning block (400) and can be close to or away from the positioning block (400). A ring of protrusions (501) is provided on the side of the pressure block (500) facing the positioning block (400).

3. The welding fixture for the manifold and electrode post according to claim 2, characterized in that, The pressure block (500) has a first flow channel (502) for introducing protective gas.

4. The welding fixture for the manifold and electrode post according to claim 3, characterized in that, The pressure block (500) has a through welding groove (503), the inlet of the first flow channel (502) is located on the first side of the pressure block (500), and the outlet of the first flow channel (502) is located on the side wall of the welding groove (503).

5. The welding fixture for the manifold and electrode post according to claim 4, characterized in that, One end of the welding groove (503) is connected to a three-way pipe (600), which is connected to the second side of the pressure block (500); the first port (601) of the three-way pipe (600) is connected to the welding groove (503), the second port (602) of the three-way pipe (600) is connected to the cooling system, and the welding torch extends into the welding groove (503) through the third port (603) of the three-way pipe (600).

6. The welding fixture for the manifold and electrode post according to claim 2, characterized in that, The first recess (401) is arranged in a spaced array along the first direction of the positioning block (400), and the positioning block (400) is integrally formed.

7. The welding fixture for the manifold and electrode post according to claim 2, characterized in that, The pressing block (500) corresponds one-to-one with the first recess (401).

8. The welding fixture for the manifold and electrode post according to claim 2, characterized in that, The positioning block (400) is provided with a second flow channel (403). The inlet of the second flow channel (403) is located on the first side of the positioning block (400), and the outlet of the second flow channel (403) is connected to the first recess (401) and the second recess (402) of the positioning block (400).

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