A sealed welding structure and assembly method for a square battery terminal

Abstract

The present invention discloses a sealing welding structure and assembly method for the lead-out terminal of a square battery. The sealing welding structure includes a lead-out terminal body, an upper sealing gasket, a lower sealing gasket and a lower metal gasket arranged in sequence from top to bottom. The middle of the lead-out terminal body is concave to form two steps, including a first step and a second step; an upper sealing gasket is provided between the lead-out terminal body and the battery shell, and a lower sealing gasket is provided between the battery shell and the lower metal gasket. The upper sealing gasket is connected to the lower sealing gasket to form an insulating seal to prevent the lead-out terminal body from contacting the battery shell; the lower sealing gasket is provided with a through hole adapted to the first step, and the metal gasket is provided with a through hole adapted to the second step; the concave portion of the lead-out terminal body is inserted into the through hole of the battery shell, the bottom side wall of the first step is connected to the top side wall of the lower metal gasket, and the bottom side wall of the second step is connected to the outer side wall of the electrode plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery sealing and welding, and in particular relates to a sealing welding structure and an assembly method for a square battery lead-out terminal. Background Art

[0002] Prismatic batteries typically consist of a metal battery case with an oblong or rectangular cross-section, external terminals, an insulating seal assembly, and electrode plates (positive and negative) to house the plates and electrolyte. The terminals are typically secured to the long sides of the case and contact the positive plates through openings in the case.

[0003] In the prior art sealed battery terminal structure, the middle of the external positive terminal is concave to form a step, and the flat part of the step is connected to the positive plate through the lower metal gasket. "Three-layer welding" is adopted, that is, the inner wall of the concave part, the lower metal gasket, and the electrode plate need to be welded together. Due to the large thickness of the weld, a higher welding power is required when using laser welding, and bubbles are easily generated at the welding position, affecting the welding quality. Figure 1 In addition, after welding, the insulating sealing component between the lead-out terminal body (or the lower metal gasket) and the battery housing will bend and deform due to the large force, resulting in poor airtightness of the battery. Summary of the Invention

[0004] The object of the present invention is to provide a sealing welding structure and an assembly method for a square battery lead-out terminal to solve the problems in the background technology.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A sealed welding structure for a square battery terminal includes a terminal body, an upper sealing gasket, a lower sealing gasket, and a lower metal gasket arranged in sequence from top to bottom. The terminal body is concave in the middle to form two steps, including a first step and a second step.

[0007] An upper sealing gasket is provided between the lead-out terminal body and the battery housing, and a lower sealing gasket is provided between the battery housing and the lower metal gasket. The upper sealing gasket and the lower sealing gasket are connected to form an insulating seal to prevent the lead-out terminal body from contacting the battery housing;

[0008] The lower sealing gasket is provided with a through hole adapted to the first step, and the lower metal gasket is provided with a through hole adapted to the second step;

[0009] Insert the inner concave portion of the lead-out terminal body into the through hole of the battery shell, connect the bottom side wall of the first step to the top side wall of the lower metal gasket, and connect the bottom side wall of the second step to the outer side wall of the electrode plate.

[0010] Preferably, the upper sealing gasket includes a planar portion and a cylindrical portion, a through hole is provided in the middle of the planar portion, an area around the through hole is raised to form a step, and a gap is formed between the outer area of ​​the planar portion and the lead-out terminal body.

[0011] Furthermore, the step of the plane portion is connected to the lead-out terminal body, and the lower end of the plane portion is connected to the battery housing;

[0012] The columnar portion is provided with upper and lower openings, and the columnar portion is tightly matched with the lower sealing gasket and is clamped between the lead-out terminal body, the battery housing, and the lower metal gasket.

[0013] In a preferred solution, the area around the through hole of the lower sealing gasket is convex downward to form a step, the step of the lower sealing gasket is connected to the lower metal gasket, and a gap is formed between the outer area of ​​the lower sealing gasket and the lower metal gasket.

[0014] Furthermore, a first groove is provided on the upper surface of the step of the planar portion, and a first protrusion adapted to the groove is provided at a corresponding position on the lower surface of the lead-out terminal body.

[0015] In a preferred solution, a second groove is provided on the lower surface of the step of the lower sealing gasket, and a second protrusion adapted to the groove is provided at a corresponding position on the upper surface of the lower metal gasket.

[0016] In a preferred solution, the lead-out end body is boat-shaped.

[0017] In a preferred solution, tilting structures are symmetrically provided on both sides of the lead-out terminal body, which are used for welding positions when the positive and negative electrodes of the battery are connected in series.

[0018] Furthermore, there are four warping structures, which are arranged at the vertices of the lead-out terminal body.

[0019] Furthermore, a protrusion is provided at the lower end of the cylindrical portion, and a groove is provided at the lower sealing gasket corresponding to the position of the protrusion, so that the upper sealing gasket and the lower sealing gasket are tightly matched.

[0020] In a preferred embodiment, the electrode plate is a positive plate or a negative plate.

[0021] The present invention also provides an assembly method of the sealed welding structure, comprising the following steps:

[0022] (1) Place the tooling base on the workbench;

[0023] (2) Place the lower metal gasket, lower sealing gasket, battery housing, upper sealing gasket, and lead-out terminal body on the tooling base in order;

[0024] (3) Guide the tooling cover into the tooling base through the positioning pins;

[0025] (4) Place the assembled tooling into the hydraulic system of the laser platform and start the hydraulic system to press the tooling;

[0026] (5) Start the laser program and perform welding according to the design of the lead body, welding the bottom side wall of the first step to the top side wall of the lower metal gasket, and welding the bottom side wall of the second step to the outer side wall of the positive plate;

[0027] (6) After welding is completed, release the hydraulic pressure, remove the tooling base and tooling cover, remove the welded workpiece, and the assembly is completed.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The present invention provides a sealed welding structure for the lead-out terminal of a square battery. The middle of the lead-out terminal body is concave to form two steps, including a first step and a second step. The bottom side wall of the first step is welded to the top side wall of the lower metal gasket, and the bottom side wall of the second step is welded to the outer side wall of the electrode plate. Only two layers need to be welded during welding, and one layer is less penetrated when welding with the positive plate. The welding quality is good, the required power is low, and the problem of bubbles easily generated at the welding position is solved.

[0030] The present invention provides a sealing welding structure for the lead-out terminal of a square battery. By arranging steps on an upper sealing gasket and a lower sealing gasket, a gap is formed between the outer area of ​​the plane portion of the upper sealing gasket and the lead-out terminal body, and a gap is formed between the outer area of ​​the lower sealing gasket and the lower metal gasket. After welding, the two sides of the lead-out terminal body (or the lower metal gasket) are not subjected to force or are subjected to little force, and the two sides of the lead-out terminal body (or the lower metal gasket) will not bend or deform, thereby not affecting the airtightness of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions implemented in the present invention, the following drawings are briefly introduced. The following drawings are only some implementation examples of the present invention, and those skilled in the art can apply them according to the drawings and actual production conditions without any creative work.

[0032] Figure 1 A cross-sectional view of a sealed battery terminal structure in the background art;

[0033] Figure 2 This is a schematic structural diagram of a square battery according to the present invention;

[0034] Figure 3 Schematic diagram of a sealing welding structure of a square battery lead-out terminal of the present invention ( Figure 2 AA section view);

[0035] Figure 4 for Figure 3 A partial enlarged view of position B in the middle;

[0036] Figure 5 This is a diagram showing the working principle of a sealed welding structure for a square battery terminal according to the present invention; (there is a gap at the arrow position, which is not subject to force or is subject to little force, so deformation will not occur)

[0037] Figure 6 A three-dimensional diagram of the lead-out terminal body 1 of the present invention;

[0038] Figure 7 A bottom view of the lower sealing gasket of the present invention;

[0039] Figure 8 A top view of the lower metal gasket of the present invention;

[0040] Figure 9 A three-dimensional cross-sectional view of a sealed welding structure of a square battery terminal according to the present invention;

[0041] Figure 10 Schematic diagram of the gap between the outer area of ​​the upper sealing gasket plane portion and the lead-out terminal body in the present invention;

[0042] Figure 11 This is a schematic diagram of a square battery connected in series through a lead-out terminal tilting structure according to the present invention;

[0043] Figure 12 for Figure 11 Enlarged view of the welding position;

[0044] Figure 13 for Figure 11 A magnified view of the mid-warp structure;

[0045] Explanation of the numbers: 1-lead end body, 101-first step, 102-second step, 2-upper sealing gasket, 201-planar part, 202-cylindrical part, 3-lower sealing gasket, 4-lower metal gasket, 5-battery case, 6-positive plate, 7-first groove, 8-first protrusion, 9-second groove, 10-second protrusion, 11-warping structure, 12-bump, 13-groove. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0047] It should be noted that the terms "up," "down," "left," "right," "front," and "back" used herein to describe directions do not refer to specific directions unless otherwise specified. These terms are provided for convenience only and may vary depending on the orientation of the product. Any directions that can be understood by a person of ordinary skill in the art without inventive effort are within the scope of protection of this invention.

[0048] Example 1

[0049] like Figure 2-10 As shown, a sealed welding structure for a square battery terminal includes a terminal body 1, an upper sealing gasket 2, a lower sealing gasket 3, and a lower metal gasket 4 arranged in sequence from top to bottom. The terminal body 1 is concave in the middle to form two steps, including a first step 101 and a second step 102. The terminal body 1 is boat-shaped.

[0050] An upper sealing gasket 2 is provided between the lead-out terminal body 1 and the battery housing, and a lower sealing gasket 3 is provided between the battery housing 5 and the lower metal gasket 4. The upper sealing gasket 2 and the lower sealing gasket 3 are connected to form an insulating seal to prevent the lead-out terminal body 1 from contacting the battery housing 5;

[0051] The lower sealing gasket 3 is provided with a through hole adapted to the first step 101, and the lower metal gasket 4 is provided with a through hole adapted to the second step 102;

[0052] Insert the inner concave part of the lead-out terminal body 1 into the through hole of the battery housing 5 , connect the bottom side wall of the first step 101 to the top side wall of the lower metal gasket 4 , and connect the bottom side wall of the second step 102 to the outer side wall of the positive plate 6 .

[0053] The upper sealing gasket 2 includes a planar portion 201 and a cylindrical portion 202. A through hole is provided in the middle of the planar portion 201. The area surrounding the through hole is raised to form a step. A gap is formed between the outer area of ​​the planar portion 201 and the lead-out terminal body 1. Figure 5 shown.

[0054] The step of the plane part 201 is connected to the lead-out terminal body 1, and the lower end of the plane part 201 is connected to the battery housing;

[0055] The cylindrical portion 202 is provided with upper and lower openings. The cylindrical portion 202 is tightly matched with the lower sealing gasket 3 and is clamped between the lead-out terminal body 1 and the battery housing and the lower metal gasket 4 .

[0056] The area around the through hole of the lower sealing gasket 3 is convex downward to form a step, and the step of the lower sealing gasket 3 is connected to the lower metal gasket 4, and a gap is formed between the outer area of ​​the lower sealing gasket 3 and the lower metal gasket 4, such as Figure 5 As shown, there is a gap at the arrow position, which is not subjected to stress or is subjected to small stress, so deformation will not occur.

[0057] Example 2

[0058] This embodiment is further improved on the basis of Example 1:

[0059] like Figure 3-4 As shown, a first groove 7 is provided on the stepped upper surface of the planar portion 201 , and a first protrusion 8 matching the groove is provided at a corresponding position on the lower surface of the lead-out terminal body 1 .

[0060] A second groove 9 is provided on the lower surface of the step of the lower sealing gasket 3 , and a second protrusion 10 adapted to the groove is provided at a corresponding position on the upper surface of the lower metal gasket 4 .

[0061] A protrusion 12 is provided at the lower end of the cylindrical portion 202 , and a groove 13 is provided at the lower sealing gasket 3 corresponding to the position of the protrusion, so that the upper sealing gasket 2 and the lower sealing gasket 3 are tightly matched.

[0062] Example 3

[0063] This embodiment is further improved on the basis of Example 1:

[0064] There are four tilting structures 11 symmetrically arranged on both sides of the lead-out terminal body 1, which are used for welding the positive and negative electrodes of the battery in series.

[0065] When two batteries are connected, the four corners of the tilted position are the connection points (welding points), which serve as the welding positions when the positive and negative poles of the batteries are connected in series. When the four legs are uneven, these four positions have elastic effects and can be adjusted, such as Figure 11-13 shown.

[0066] Example 4

[0067] A sealed welding structure for a square battery terminal, wherein the assembly tool is composed of a tool base and a tool cover, and the assembly method is as follows:

[0068] (1) Place the tooling base on the workbench;

[0069] (2) Place the lower metal gasket 4, lower sealing gasket 3, battery housing 5, upper sealing gasket 2, and lead-out terminal body 1 on the tooling base in order;

[0070] (3) Guide the tooling cover into the tooling base through the positioning pins;

[0071] (4) Place the assembled tooling into the hydraulic system of the laser platform and start the hydraulic system to press the tooling;

[0072] (5) Start the laser program and perform welding according to the design of the lead-out terminal body 1, welding the bottom side wall of the first step 101 to the top side wall of the lower metal gasket 4, and welding the bottom side wall of the second step 102 to the outer side wall of the positive electrode plate 6;

[0073] (6) After welding is completed, release the hydraulic pressure, remove the tooling base and tooling cover, remove the welded workpiece, and the assembly is completed.

[0074] The present invention provides a sealing welding structure for the lead-out terminal of a square battery. The middle of the lead-out terminal body is concave to form two steps, including a first step and a second step. The bottom side wall of the first step is welded to the top side wall of the lower metal gasket, and the bottom side wall of the second step is welded to the outer side wall of the positive plate (or negative plate). Only two layers need to be welded during welding, and one less layer is penetrated when welding with the positive plate (or negative plate). The welding quality is good, and the problem of bubbles easily generated at the welding position can be solved. By arranging steps on the upper sealing gasket and the lower sealing gasket, a gap is formed between the outer area of ​​the plane part of the upper sealing gasket and the lead-out terminal body, and a gap is formed between the outer area of ​​the lower sealing gasket and the lower metal gasket. After welding, the two sides of the lead-out terminal body (or lower metal gasket) are not subjected to force or are subjected to little force, and the two sides of the lead-out terminal body (or lower metal gasket) will not bend or deform, thereby not affecting the airtightness of the battery. Figure 5 shown.

[0075] The above is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiment. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of the present invention should also be considered as the scope of protection of the present invention.

Claims

1. A sealed welding structure for a square battery terminal, characterized in that: The lead-out terminal body (1), an upper sealing gasket (2), a lower sealing gasket (3) and a lower metal gasket (4) are sequentially arranged from top to bottom. The middle of the lead-out terminal body (1) is concave to form two steps, including a first step (101) and a second step (102). An upper sealing gasket (2) is provided between the lead-out terminal body (1) and the battery housing (5), and a lower sealing gasket (3) is provided between the battery housing and the lower metal gasket (4). The upper sealing gasket (2) and the lower sealing gasket (3) are connected to form an insulating seal to prevent the lead-out terminal body (1) from contacting the battery housing (5). The lower sealing gasket (3) is provided with a through hole adapted to the first step (101), and the lower metal gasket (4) is provided with a through hole adapted to the second step (102); The inner concave portion of the lead-out terminal body (1) is inserted into the through hole of the battery housing (5), the bottom side wall of the first step (101) is connected to the top side wall of the lower metal gasket (4), and the bottom side wall of the second step (102) is connected to the outer side wall of the positive electrode plate (6); The upper sealing gasket (2) comprises a planar portion (201) and a cylindrical portion (202); a through hole is provided in the middle of the planar portion (201); an area surrounding the through hole is raised to form a step, and a gap is formed between the outer area of ​​the planar portion (201) and the lead-out terminal body (1); Alternatively, the area around the through hole of the lower sealing gasket (3) is convex downward to form a step, and the step of the lower sealing gasket (3) is connected to the lower metal gasket (4), forming a gap between the outer area of ​​the lower sealing gasket (3) and the lower metal gasket (4).

2. A sealed welding structure for a square battery terminal according to claim 1, characterized in that: The step of the plane part (201) is connected to the lead-out terminal body (1), and the lower end of the plane part (201) is connected to the battery housing; The columnar portion (202) is provided with upper and lower openings, and the columnar portion (202) is tightly matched with the lower sealing gasket (3) and is clamped between the lead-out terminal body (1), the battery housing, and the lower metal gasket (4).

3. The sealing welding structure of the lead-out terminal of a square battery according to claim 1, characterized in that: A first groove (7) is provided on the stepped upper surface of the planar portion (201), and a first protrusion (8) adapted to the groove is provided at a corresponding position on the lower surface of the lead-out terminal body (1).

4. The sealing welding structure of the lead-out terminal of a square battery according to claim 1, characterized in that: A second groove (9) is provided on the lower surface of the step of the lower sealing gasket (3), and a second protrusion (10) adapted to the groove is provided at a corresponding position on the upper surface of the lower metal gasket (4).

5. The sealing welding structure of the lead-out terminal of a square battery according to claim 1, characterized in that: The lead-out end body (1) is boat-shaped.

6. The sealing welding structure of the lead-out terminal of a square battery according to claim 1, characterized in that: Both sides of the lead-out terminal body (1) are symmetrically provided with tilting structures (11), which are used for welding positions when the positive and negative electrodes of the battery are connected in series.

7. The sealing welding structure of the lead-out terminal of a square battery according to claim 2, characterized in that: The lower end of the columnar portion (202) is provided with a protrusion (12), and the lower sealing gasket (3) is provided with a groove (13) corresponding to the position of the protrusion, so that the upper sealing gasket (2) and the lower sealing gasket (3) are tightly matched.

8. The method for assembling a sealed welded structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Place the tooling base on the workbench; (2) Place the lower metal gasket (4), lower sealing gasket (3), battery housing (5), upper sealing gasket (2), and lead-out terminal body (1) on the tooling base in order; (3) Guide the tooling cover into the tooling base through the positioning pins; (4) Place the assembled tooling into the hydraulic system of the laser platform and start the hydraulic system to press the tooling; (5) Start the laser program and perform welding according to the design of the lead-out terminal body (1), welding the bottom side wall of the first step (101) to the top side wall of the lower metal gasket (4), and welding the bottom side wall of the second step (102) to the outer side wall of the positive electrode plate (6); (6) After welding is completed, release the hydraulic pressure, remove the tooling base and tooling cover, remove the welded workpiece, and the assembly is completed.

Images