Spot welding tension test fixture for explosion-proof combined cap of cylindrical lithium battery

Abstract

The utility model discloses a spot welding tension test fixture for an explosion-proof combined cap of a cylindrical lithium battery, which comprises a connecting block and a plurality of pull claws connected onto the connecting block, and the pull claws are movably connected with the connecting block through pins; a pull shaft is movably connected to the connecting block and provided with a limiting sleeve making contact with the abutting end of the pull claw. Along with the downward movement of the pull shaft, the limiting sleeve pushes the pull claws to rotate around the pins, so that the pins of the pull claws are close to each other. Through up-and-down movement of the pull shaft, the limiting sleeve extrudes the abutting ends of the pull claws, the pull claws rotate around the pins, and then the ends, containing the pins, of the multiple pull claws get close to or away from one another to adapt to caps of different sizes, and the caps are effectively clamped. When in use, the pull shaft is driven by a tensile machine to pull off the connecting sheet connected with the pin upwards, so that the welding upright posts of the two welding spots are exposed, and the welding spot upright posts are convenient to observe and measure.

Description

TECHNICAL FIELD

[0001] The utility model relates to tool fixture field technology especially is a kind of cylindrical lithium battery explosion-proof combination cap spot welding tension test fixture. BACKGROUND

[0002] Lithium battery can be roughly divided into two categories: lithium metal battery and lithium ion battery. Lithium ion battery does not contain metal lithium, and it is rechargeable. The fifth generation product of rechargeable battery, lithium metal battery, was born in 1996, and its safety, specific capacity, self-discharge rate and performance-price ratio are better than lithium ion battery. In the appearance of lithium battery, it is generally cylindrical lithium battery, and the cylindrical lithium battery needs to be sealed and conducted through cap.

[0003] The existing cylindrical lithium battery explosion-proof combination cap (hereinafter referred to as cap) industry still has no better test fixture for spot welding tensile strength. According to the understanding, most enterprises judge the welding firmness by torque, but cannot effectively observe the size of the welding point stand, because rotating and twisting will cause the welding point to fall off, and after twisting, the welding point area cannot be identified and measured, so the tensile strength test is a bottleneck in the cap industry. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a cylindrical lithium battery explosion-proof combination cap spot welding tension test fixture, which solves the problem that the welding firmness is judged by torque, but the size of the welding point stand cannot be effectively observed, because rotating and twisting will cause the welding point to fall off, and after twisting, the welding point area cannot be identified and measured, so the tensile strength test is a bottleneck in the cap industry.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a cylindrical lithium battery explosion-proof combination cap spot welding tension test fixture, comprising a connecting block and a plurality of pull claws connected to the connecting block, the pull claw and the connecting block are connected through a pin; a pull shaft is movably connected to the connecting block, and a limiting sleeve is arranged on the pull shaft and in contact with the abutting end of the pull claw; when the pull shaft moves downward, the limiting sleeve pushes the pull claw to rotate around the pin, so that the pins of the plurality of pull claws are close to each other.

[0006] Further, the pull claw comprises a first plate body connected to the connecting block, a first bending part and a second bending part arranged on the upper end and the lower end of the first plate body, and the first bending part and the second bending part are bent towards the connecting block.

[0007] Further, the first bending part comprises a bending part and a horizontal part, and the abutting end is located on the horizontal part.

[0008] Further, the pin is located in the lower part of the inner surface of the second bending part.

[0009] Furthermore, the limiting sleeve is conical, and the surface wall of the limiting sleeve has multiple horizontal sections arranged at equal intervals, with the contact end abutting against the horizontal sections.

[0010] Furthermore, the connecting block is provided with multiple grooves at equal intervals, the grooves hold pull claws, and the pins are inserted into the grooves at the side edge of the connecting block to abut against each other.

[0011] Furthermore, an elastic element is provided at the connection between the pin and the pull claw, which drives the pins on the multiple pull claws to come together.

[0012] Furthermore, the connecting block has a threaded opening in the middle, and the pull shaft is screwed into the threaded opening.

[0013] Compared with the prior art, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, by moving the pull shaft up and down, the limiting sleeve squeezes the contact end of the pull claw, causing the pull claw to rotate around the pin. This causes the ends of multiple pull claws containing pins to move closer together or further apart, adapting to caps of different sizes and effectively clamping the caps while exposing the weld points. In use, a tensile testing machine drives the pull shaft upward to break the connecting piece connected to the pins, exposing the welding posts of the two weld points for easy observation and measurement.

[0014] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a perspective view of Embodiment 1 of this utility model.

[0016] Figure 2 This is a diagram illustrating the connecting block and pull shaft of Embodiment 1 of this utility model.

[0017] Figure 3 This is a three-dimensional view of the pull shaft of Embodiment 1 of this utility model.

[0018] Figure 4 This is a three-dimensional view of the connecting block of Embodiment 1 of this utility model.

[0019] Explanation of reference numerals in the attached diagram:

[0020] 10 Connecting blocks, 11 Grooves, 12 Threaded openings;

[0021] 20 Pull claw, 201 First plate, 21 Contact end, 22 Pin, 23 First bend, 231 Bending part, 232 Horizontal part, 24 Second bend;

[0022] 30 pins, 31 elastic elements;

[0023] 40 Pull shaft, 41 Limit sleeve, 411 Horizontal section. Detailed Implementation

[0024] Please refer to Figures 1-4 As shown, this invention illustrates the specific structure of a preferred first embodiment of the present invention, which is a spot welding tensile testing fixture for a cylindrical lithium battery explosion-proof combination cap. It includes a connecting block 10 and multiple pull claws 20 connected to the connecting block 10. The pull claws 20 are movably connected to the connecting block 10 via pins 30. A pull shaft 40 is movably connected to the connecting block 10, and a limiting sleeve 41 is provided on the pull shaft 40 to contact the contact end 21 of the pull claws 20. As the pull shaft 40 moves downward, the limiting sleeve 41 pushes the pull claws 20 to rotate around the pin 30, causing the pins 22 of the multiple pull claws 20 to approach each other. Through the up-and-down movement of the pull shaft 40, the limiting sleeve 41 compresses the contact end 21 of the pull claws 20, causing the pull claws 20 to rotate around the pin 30, thereby causing the ends of the multiple pull claws 20 containing pins 22 to approach or move away, adapting to caps of different sizes and effectively clamping the caps. In use, the tensioning machine drives the tension shaft 40 to pull upwards and break the connecting piece connected to the pin 22, exposing the welding columns of the two welding points, so as to facilitate the observation and measurement of the welding column.

[0025] like Figure 1 As shown, exemplarily, the pull claw 20 includes a first plate 201 connected to the connecting block 10, a first bent portion 23 and a second bent portion 24 disposed at the upper and lower ends of the first plate 201, respectively, the first bent portion 23 and the second bent portion 24 being bent toward the connecting block 10. The first plate 201 provides space for the first bent portion 23 and the second bent portion 24 to move.

[0026] Specifically, the first plate 201, the first bent portion 23, and the second bent portion 24 are integrally formed, with the first bent portion 23 located at the upper end of the first plate 201 and the second bent portion 24 located at the lower end of the first plate 201. The first bent portion 23 can abut against the limiting sleeve 41, while the second bent portion 24 can clamp the cap. When the first bent portion 23 is squeezed, the first plate 201 rotates around the pin 30, causing the second bent portion 24 to clamp the cap. When the first bent portion 23 is not squeezed, the first plate 201 still rotates around the pin 30, causing the second bent portion 24 to release the cap.

[0027] like Figure 1As shown, exemplarily, the first bending portion 23 includes a bending portion 231 and a horizontal portion 232. The contact end 21 is located on the horizontal portion 232. In order to make it easier for the first bending portion 23 to drive the first plate 201 to rotate under the compression of the limiting sleeve 41, the first bending portion 23 is divided into a bending portion 231 and a horizontal portion 232. The bending portion 231 is connected to the first plate 201, so that the horizontal portion 232 is closer to the limiting sleeve 41 than the first plate 201. The horizontal portion 232 is connected to the bending portion 231, increasing the contact area with the limiting sleeve 41. This makes it easier for the limiting sleeve 41 to compress the horizontal portion 232, thus driving the entire pull claw 20 to operate in a seesaw manner.

[0028] The pin 22 is located on the lower part of the inner surface of the second bend 24. The pin 22 is close to the lower side edge of the second bend 24, so that when the second bend 24 is brought together, the cap can be clamped more tightly.

[0029] like Figure 3 As shown, for example, the limiting sleeve 41 is conical, and the surface of the limiting sleeve 41 has multiple horizontal cross sections 411 arranged at equal intervals. The contact end 21 abuts against the horizontal cross sections 411. When the limiting sleeve 41 is conical, due to the characteristics of the cone being wider at the top and narrower at the bottom or narrower at the top and wider at the bottom, the distance between the multiple pins 22 can be changed when the horizontal part 232 is squeezed at different positions of the limiting sleeve 41 to adapt to caps of different sizes. However, the conical design of the limiting sleeve 41 results in an overlapping connection between the horizontal part 232 and the limiting sleeve 41. Although this does not affect the overall use, wear over time will cause gaps to appear between the horizontal part 232 and the limiting sleeve 41, thereby affecting the stability of the pins 22 when clamped. Therefore, horizontal cross sections 411 are provided on the limiting sleeve 41 so that the horizontal part 232 can contact the horizontal cross sections 411 to reduce wear during use.

[0030] like Figure 2 As shown, for example, the connecting block 10 is provided with a plurality of equally spaced grooves 11. The grooves 11 clamp the pull claw 20, and the pin 30 passes through the side edge of the connecting block 10 and abuts in the groove 11. By clamping the pull claw 20 with the grooves 11, the movement trajectory of the pull claw 20 will not be deviated, thereby enhancing the clamping and positioning effect of the pull claw 20 on the cap.

[0031] like Figure 2 As shown, for example, an elastic element 31 is provided at the connection between the pin 30 and the pull claw 20. The elastic element 31 drives the pins 22 on the multiple pull claws 20 to move closer together. The elastic element 31 is a torsion spring. Through the elastic restoring force driven by the elastic element 31, the pull claws 20 are at the limit of how close the pins 22 can move together under normal conditions, making the pins 22 clamp the cap more stably.

[0032] Specifically, the two ends of the torsion spring are fixed to the pin 30 and the first plate 201 respectively, so that the torsion spring can drive the first plate 201 to rotate around the pin 30 through its own elastic deformation.

[0033] The connecting block 10 has a threaded opening 12 in the middle, and the pull shaft 40 is screwed into the threaded opening 12. The opening of the threaded opening 12 effectively limits the torsional energy of the pull shaft 40 within the threaded opening 12.

[0034] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A spot welding tensile testing fixture for a cylindrical lithium battery explosion-proof combined cap, comprising a connecting block (10) and a plurality of pull claws (20) connected to the connecting block (10), characterized in that: The pull claw (20) and the connecting block (10) are movably connected by a pin (30); a pull shaft (40) is movably connected to the connecting block (10), and a limiting sleeve (41) is provided on the pull shaft (40) to contact the contact end (21) on the pull claw (20); as the pull shaft (40) moves downward, the limiting sleeve (41) pushes the pull claw (20) to rotate around the pin (30), so that the pins (22) of the multiple pull claws (20) come together.

2. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 1, characterized in that: The pull claw (20) includes a first plate (201) connected to the connecting block (10), a first bent portion (23) and a second bent portion (24) located at the upper and lower ends of the first plate (201), the first bent portion (23) and the second bent portion (24) being bent toward the connecting block (10).

3. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 2, characterized in that: The first bending portion (23) includes a bending portion (231) and a horizontal portion (232), and the abutting end (21) is located on the horizontal portion (232).

4. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 3, characterized in that: The pin (22) is located on the lower part of the inner surface of the second bend (24).

5. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 1, characterized in that: The limiting sleeve (41) is conical, and the surface wall of the limiting sleeve (41) is provided with multiple horizontal sections (411) arranged at equal intervals, and the contact end (21) abuts against the horizontal sections (411).

6. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 1, characterized in that: The connecting block (10) is provided with a plurality of grooves (11) at equal intervals. The grooves (11) hold the pull claw (20). The pin (30) passes through the groove (11) at the side edge of the connecting block (10) and abuts against it.

7. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 1, characterized in that: An elastic element (31) is provided at the connection between the pin (30) and the pull claw (20), and the elastic element (31) drives the pins (22) on the multiple pull claws (20) to come together.

8. The cylindrical lithium battery explosion-proof combined cap spot welding tensile test fixture according to claim 1, characterized in that: The connecting block (10) has a threaded opening (12) in the middle, and the pull shaft (40) is screwed into the threaded opening (12).

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