A sealing welding structure and sealing method for reducing the burst point of the sealing weld.

Abstract

This invention discloses a sealing welding structure and sealing method for reducing weld burst points, comprising: a cover plate with an injection port on its inner side and a sealing groove on the injection port; adhesive nails disposed on the inner side of the injection port; and a sealing metal sheet disposed on the inner side of the sealing groove, wherein the inner edge of the sealing metal sheet forms a weld seam fixed to the cover plate by a through weld; wherein the sealing groove includes a first connecting groove and a second connecting groove, and the first connecting groove has a second connecting groove; by providing a first connecting groove, a second connecting groove, a through weld seam, and a sealing metal sheet, this device can effectively avoid electrolyte residue, thereby avoiding the impact of weld burst points on the welding. At the same time, by improving the welding method and using through welding, the horizontal stress on the sealing metal sheet is reduced, the large gap in the original splicing bevel is reduced, and the sealing effect is improved.

Description

Technical Field

[0001] This invention specifically relates to a sealing welding structure and sealing method for reducing the burst point of sealing welds. Background Technology

[0002] Lithium batteries are rechargeable batteries widely used in portable electronic devices, electric vehicles, energy storage systems, and many other fields. Glue pins and sealing aluminum sheets are important components in the assembly process of lithium-ion batteries, especially square aluminum-cased batteries. Their main function is to ensure that the electrolyte injection port of the cover can be completely sealed after the battery is injected with electrolyte, preventing electrolyte leakage and the entry of external air or moisture, thereby ensuring the safety and long-term stable operation of the battery.

[0003] The existing method for sealing the liquid injection port on the cover plate involves first sealing the port with adhesive nails, then cleaning the injection port area, and finally fixing the sealing aluminum sheet to the welding groove of the cover plate by splicing welding. Figure 4 As shown, the R-corner of the welding tank cannot be effectively cleaned, leaving residual electrolyte crystals. Although the weld pool does not reach the bottom R-corner, the welding heat and metal vapor will vaporize the electrolyte crystals and dissolve them into the weld pool. If the weld pool cannot be drained in time, it will lead to welding bursts. In addition, the gap of traditional splicing welds is large, which affects the sealing effect. Therefore, we propose a sealing welding structure and sealing method to reduce the bursts of sealing welds. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing welding structure and sealing method that reduces the risk of weld bursts, in order to solve the problem mentioned in the background art where electrolyte crystallization occurs at the weld groove R-corner where the sealing aluminum sheet and the cover plate are welded together, which may lead to weld bursts.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealing welding structure that reduces the burst point of the sealing weld, comprising:

[0006] A cover plate, wherein an injection port is provided on the inner side of the cover plate, and a sealing groove is provided on the injection port;

[0007] The rubber nail is installed inside the injection port;

[0008] A sealing metal sheet is disposed inside the sealing groove, and the inner edge of the sealing metal sheet has a weld seam that is fixed to the cover plate by a through weld.

[0009] The sealing groove includes a first connecting groove and a second connecting groove. The first connecting groove has a second connecting groove, and the inner diameter of the second connecting groove is larger than the inner diameter of the first connecting groove.

[0010] The weld seam formed by penetration welding is convenient, avoiding the large weld seam gap caused by the contact between the sealing metal sheet and the cover plate in traditional splicing welding, which affects the sealing effect. The weld seam formed by penetration welding reduces the weld seam gap and can also effectively reduce the horizontal stress on the sealing metal sheet. In addition, the sealing groove consists of two sections, the first connecting groove and the second connecting groove, which can effectively reduce the electrolyte residue after cleaning that may cause the welding explosion point. It is also easy to improve the cleanliness of the second connecting groove to improve the welding effect.

[0011] The outer surface of the sealing metal sheet has a connecting slope, and the inner surface of the second connecting groove has a first sealing slope corresponding to the connecting slope.

[0012] This facilitates better contact and sealing, while the use of through-welding can effectively reduce the large weld gaps present in splicing welds.

[0013] The inner wall of the first connecting groove has a second sealing slope with the same inclination as the first sealing slope;

[0014] This facilitates better sealing.

[0015] Preferably, a sealing protrusion is fixed on the lower surface of the sealing metal sheet, and the height of the sealing protrusion corresponds to the depth of the first connecting groove.

[0016] This facilitates a better seal at the injection port.

[0017] Preferably, the inner diameter of the injection port is the same as the outer diameter of the rubber nail, and the inner diameter of the injection port is smaller than the inner diameter of the first connecting groove.

[0018] This allows for a more comprehensive seal at the injection port, reducing electrolyte leakage from the injection port.

[0019] Preferably, the sealing metal sheet is made of aluminum.

[0020] It helps reduce costs and facilitates welding operations.

[0021] Preferably, the material of the adhesive nail is EPDM rubber or silicone.

[0022] This facilitates better corrosion resistance.

[0023] Preferably, the outer diameter of the rubber nail increases sequentially from the lower end to the upper end.

[0024] A sealing method for a sealing weld structure that reduces the risk of weld explosion includes the following steps:

[0025] Step A: After injecting the liquid through the injection port, insert the rubber pin into the inside of the injection port to seal it;

[0026] Step B: Clean the inside of the sealing groove with laser or dry ice, and then place the sealing metal sheet inside the sealing groove. At this time, the sealing protrusion extends into the inside of the first connecting groove, and the connecting slope contacts the first sealing slope.

[0027] Step C: Fix the sealing metal sheet to the cover plate by penetration welding, at which point the weld seam corresponds to the second connecting groove.

[0028] By changing the shape of the sealing groove and the structure of the sealing metal sheet, the influence of residual electrolyte crystallization on welding can be avoided, thereby saving a lot of labor in manually cleaning the injection hole, reducing welding bursts, and improving the pass rate of sealing welding.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This patent, by incorporating a first connecting groove, a second connecting groove, a through-weld weld seam, and a sealing metal sheet, avoids the problem of traditional, simple welding grooves where electrolyte residue remains at the R-corner of the welding groove after injection through the liquid inlet of the cover plate. This residue is prone to causing bursts when using ordinary splicing welding. This device effectively avoids electrolyte residue, thus preventing the impact of welding bursts on the weld. At the same time, by improving the welding method and using through-welding, the horizontal stress on the sealing metal sheet is reduced, the large gap in the original splicing bevel is reduced, and the sealing effect is improved. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the sealing groove structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the sealing metal sheet structure of the present invention;

[0034] Figure 4 This is a schematic diagram of an existing splicing and welding structure.

[0035] In the diagram: 1. Cover plate; 2. Glue nail; 3. Sealing metal sheet; 301. Sealing protrusion; 302. Connecting bevel; 4. Sealing groove; 401. First connecting groove; 402. Second connecting groove; 4021. First sealing bevel; 5. Weld seam; 6. Liquid injection port. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-4 This invention provides a technical solution: a sealing welding structure that reduces the burst point of the sealing weld, comprising:

[0038] Cover plate 1, with an injection port 6 on the inner side of cover plate 1, and a sealing groove 4 on injection port 6;

[0039] Plug 2 is located inside the injection port 6;

[0040] A sealing metal sheet 3 is disposed inside the sealing groove 4, and a weld seam 5 is formed on the inner edge of the sealing metal sheet 3 and fixed to the cover plate 1 by a through weld.

[0041] The sealing groove 4 includes a first connecting groove 401 and a second connecting groove 402. The first connecting groove 401 is provided with the second connecting groove 402, and the inner diameter of the second connecting groove 402 is larger than the inner diameter of the first connecting groove 401.

[0042] The weld seam 5 formed by penetration welding is convenient to avoid the weld seam being located at the contact point between the sealing metal sheet 3 and the cover plate 1 during traditional splicing welding, which would cause a large weld seam gap and affect the sealing effect. The weld seam 5 formed by penetration welding reduces the weld seam gap and can also effectively reduce the horizontal stress on the sealing metal sheet 3. In addition, the sealing groove 4 is composed of two sections, the first connecting groove 401 and the second connecting groove 402, which can effectively reduce the electrolyte residue after cleaning from entering the inner side of the second connecting groove 402 and causing the welding explosion point. It is also convenient to improve the cleanliness of the second connecting groove 402 to improve the welding effect.

[0043] The outer surface of the sealing metal sheet 3 has a connecting slope 302, and the inner surface of the second connecting groove 402 is provided with a first sealing slope 4021 corresponding to the connecting slope 302.

[0044] This facilitates better contact and sealing, while the use of through-weld 5 can effectively reduce the large weld gap present in splice welding.

[0045] The inner wall of the first connecting groove 401 has a second sealing slope with the same inclination as the first sealing slope 4021;

[0046] This facilitates better sealing.

[0047] Preferably, a sealing protrusion 301 is fixed on the lower surface of the sealing metal sheet 3, and the height of the sealing protrusion 301 corresponds to the depth of the first connecting groove 401.

[0048] This facilitates a better seal at the six injection ports.

[0049] Preferably, the inner diameter of the injection port 6 is the same as the outer diameter of the rubber nail 2, and the inner diameter of the injection port 6 is smaller than the inner diameter of the first connecting groove 401.

[0050] This facilitates a more comprehensive sealing of the injection port 6, reducing electrolyte leakage from the injection port 6.

[0051] Preferably, the sealing metal sheet 3 is made of aluminum.

[0052] It helps reduce costs and facilitates welding operations.

[0053] Preferably, the material of the adhesive nail 2 is EPDM rubber or silicone.

[0054] This facilitates better corrosion resistance.

[0055] Preferably, the outer diameter of the rubber nail 2 increases sequentially from the lower end to the upper end.

[0056] A sealing method for a sealing weld structure that reduces the risk of weld explosion includes the following steps:

[0057] Step A: After injecting liquid through injection port 6, insert the rubber nail 2 into the inside of injection port 6 to seal it;

[0058] Step B: Clean the inside of the sealing groove 4 with laser or dry ice, and then place the sealing metal sheet 3 inside the sealing groove 4. At this time, the sealing protrusion 301 extends into the inside of the first connecting groove 401, and the connecting inclined surface 302 contacts the first sealing inclined surface 4021.

[0059] Step C: Fix the sealing metal sheet 3 to the cover plate 1 by through welding, at which point the weld seam 5 corresponds to the second connecting groove 402.

[0060] By changing the shape of the sealing groove 4 and the structure of the sealing metal sheet 3, the influence of residual electrolyte crystallization on welding can be avoided, thereby saving a lot of labor in manually cleaning the injection hole, reducing welding bursts, and improving the pass rate of sealing welding.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing welding structure that reduces the explosion point of the sealing weld, characterized in that, include: Cover plate (1), with an injection port (6) on the inner side of the cover plate (1), and a sealing groove (4) provided on the injection port (6); A rubber nail (2) is placed inside the injection port (6); A sealing metal sheet (3) is disposed inside the sealing groove (4), and the inner edge of the sealing metal sheet (3) is formed with a weld seam (5) that is fixed to the cover plate (1) by a through weld. The sealing groove (4) includes a first connecting groove (401) and a second connecting groove (402). The first connecting groove (401) is provided with the second connecting groove (402), and the inner diameter of the second connecting groove (402) is larger than the inner diameter of the first connecting groove (401). The outer surface of the sealing metal sheet (3) has a connecting slope (302), and the inner surface of the second connecting groove (402) is provided with a first sealing slope (4021) corresponding to the connecting slope (302); The inner wall of the first connecting groove (401) has a second sealing slope with the same inclination as the first sealing slope (4021).

2. The sealing welding structure for reducing the burst point of the sealing weld according to claim 1, characterized in that: A sealing protrusion (301) is fixed on the lower surface of the sealing metal sheet (3), and the height of the sealing protrusion (301) corresponds to the depth of the first connecting groove (401).

3. The sealing welding structure for reducing the burst point of the sealing weld according to claim 1, characterized in that: The inner diameter of the injection port (6) is the same as the outer diameter of the rubber nail (2), and the inner diameter of the injection port (6) is smaller than the inner diameter of the first connecting groove (401).

4. The sealing welding structure for reducing the burst point of the sealing weld according to claim 1, characterized in that: The sealing metal sheet (3) is made of aluminum.

5. A sealing welding structure for reducing the burst point of the sealing weld according to claim 1, characterized in that: The material of the adhesive nail (2) is EPDM rubber or silicone.

6. A sealing welding structure for reducing the burst point of the sealing weld according to claim 1, characterized in that: The outer diameter of the glue nail (2) increases from the bottom to the top.

7. A sealing method for a sealing weld structure that reduces the burst point of the sealing weld according to any one of claims 1-6, characterized in that, Includes the following steps: Step A: After injecting liquid through the injection port (6), insert the rubber nail (2) into the inside of the injection port (6) to seal it; Step B: Clean the inside of the sealing groove (4) with laser or dry ice, and then place the sealing metal sheet (3) inside the sealing groove (4). At this time, the sealing protrusion (301) extends into the inside of the first connecting groove (401), and the connecting inclined surface (302) contacts the first sealing inclined surface (4021). Step C: Fix the sealing metal sheet (3) to the cover plate (1) by through welding, at which point the weld seam (5) corresponds to the second connecting groove (402).

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