Battery tab double-burner end face flatness detection jig

Abstract

The utility model discloses a battery pole ear double welding needle end face flatness detection tool, including base and check block, one end of base is equipped with first detection part, the surface of first detection part is equipped with first detection plane, check block is fixedly arranged on first detection plane, one end of check block is equipped with second detection part, the surface of second detection part is equipped with second detection plane, first detection plane and second detection plane form the step structure, the height of second detection plane is greater than the height of first detection plane, and the height difference of both is less than or equal to 0.5mm. The utility model discloses battery pole ear double welding needle end face flatness detection tool can detect the flatness of double welding needle end face fast and conveniently, and the detection is accurate.

Description

Technical Field

[0001] This utility model relates to a testing fixture, and more particularly to a testing fixture for the flatness of the end faces of the double welding pins on battery tabs. Background Technology

[0002] When machining the tabs of steel-cased (aluminum-cased) batteries, double welding pins are required for welding. For example... Figures 1-3 As shown, the negative electrode tab 301 of the battery cell 300 needs to be fixed to the pressure plate 303 of the cover plate 302 using a dual-needle welding machine 400. To improve the welding quality, the end faces of the two welding needles 200 need to be leveled during the spot connection. After leveling, the flatness of the end faces of the two welding needles 200 is checked visually by employees. However, visual inspection requires experienced workers, which places extremely high demands on them. Moreover, the tip of the welding needle 200 is very small, making it impossible to ensure accuracy every time, and the inspection is time-consuming and labor-intensive. If the end faces of the welding needles 200 are not level, it is easy to have a poor weld, which seriously affects the quality of the battery. Utility Model Content

[0003] The purpose of this invention is to provide a fixture for testing the flatness of the end faces of the double welding pins on battery tabs, which can quickly and conveniently test the flatness of the end faces of the double welding pins, and the test is accurate.

[0004] To achieve the above objectives, this utility model provides a fixture for testing the flatness of the end faces of the double welding pins of a battery tab, including a base and an inspection block. One end of the base is provided with a first detection part, and the surface of the first detection part is provided with a first detection plane. The inspection block is fixedly disposed on the first detection plane. One end of the inspection block is provided with a second detection part, and the surface of the second detection part is provided with a second detection plane. The first detection plane and the second detection plane form a stepped structure. The height of the second detection plane is greater than the height of the first detection plane, and the height difference between the two is less than or equal to 0.5 mm. Compared with existing technologies, this utility model sets up a base and an inspection block. A first inspection plane is set on the first inspection part of the base, and a second inspection plane is set on the second inspection part of the inspection block. The height of the second inspection plane is greater than the height of the first inspection plane, with a height difference between 0-0.5mm. This height difference is set as the maximum value for acceptable flush deviation of the two welding needle end faces. Therefore, during inspection, it is only necessary to align the longer welding needle with the first inspection plane of the first inspection part, and then align the shorter welding needle with the second inspection part. The entire inspection fixture is then moved, and it is observed whether the shorter welding needle can pass over the end face of the second inspection part and cross the second inspection plane. If it passes smoothly, it indicates that the flush deviation of the two welding needle end faces is greater than 0.5mm, and their flushness is unacceptable; conversely, if it cannot pass, it indicates that the flush deviation of the two welding needle end faces is less than 0.5mm, and their flushness is acceptable. Therefore, workers only need to move the inspection fixture to quickly perform the inspection, which is very simple and accurate, requires low worker skill, and saves time and effort.

[0005] Preferably, the base has a first limiting part at the end away from the inspection block, and the surface of the first limiting part has a first stepped surface, the height of which is greater than the height of the first detection plane; the first limiting part, the first detection plane, and the second detection part form an upward-opening welding needle groove. By setting the welding needle groove, longer welding needles can be limited, preventing the two welding needles from deviating during inspection, and ensuring the convenience and accuracy of each inspection.

[0006] Specifically, the width of the welding needle groove is greater than the diameter of one welding needle but less than the diameter of both welding needles. This prevents two welding needles from moving out of the welding needle groove simultaneously, thereby avoiding detection failure and ensuring accurate detection each time.

[0007] Preferably, the other end of the inspection block is provided with a second limiting part, the surface of which has a second stepped surface, the height of which is greater than the height of the second detection plane. The second limiting part prevents the welding pin on the second detection plane from deviating, ensuring convenience and accuracy in each inspection.

[0008] Preferably, the length of the first detection part is greater than the length of the second detection part, so that at least one of the front or rear surface of the first detection part extends relative to the second detection part, forming an alignment plane for aligning the two welding pins. By setting the alignment plane, the two welding pins can be aligned with the first detection plane before detection, ensuring that the longer welding pin is always in contact with the first detection plane, thereby ensuring the accuracy of the detection.

[0009] Preferably, the surface of the second detection unit is provided with a plurality of second detection planes, which are arranged sequentially with increasing heights, and there is a height difference between adjacent second detection planes. By setting multiple second detection planes, the height difference between the two welding pins can be accurately detected, and it is applicable to the requirements of welding pins for different double-pin welding pairs.

[0010] Specifically, the height difference between two adjacent second detection planes is 0.1 mm.

[0011] Preferably, a level is provided at one end of the base. By setting a level, operators can operate more precisely, effectively reducing errors during the testing process and improving the accuracy of the test.

[0012] Specifically, the second detection units are arranged symmetrically and at intervals on opposite sides of the base. This allows for separate detection of the left and right welding pins, improving detection accuracy.

[0013] Preferably, the base and the inspection block are detachably connected or are integrally formed.

[0014] Preferably, the base and the inspection block are made of bakelite. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the battery cell and cover plate.

[0016] Figure 2 This is a structural diagram showing the connection between the battery cell's tabs and the pressure plate on the cover plate.

[0017] Figure 3 This is a diagram showing the structure of a double-needle welding machine welding the tabs of a battery cell to the pressure plate of a cover plate.

[0018] Figure 4 This is a perspective view of the battery tab double welding pin end face flatness detection fixture according to Embodiment 1 of this utility model.

[0019] Figure 5 This is a side view of the battery tab double welding pin end face flatness detection fixture according to Embodiment 1 of this utility model.

[0020] Figure 6 This is a structural diagram of the base of the battery tab double welding pin end face flatness detection fixture according to Embodiment 1 of this utility model.

[0021] Figure 7 This is a structural diagram of the inspection block of the battery tab double welding pin end face flatness detection fixture according to Embodiment 1 of this utility model.

[0022] Figure 8 This is a state diagram of the battery tab double welding pin end face flatness detection fixture according to Embodiment 1 of this utility model for detecting double welding pins.

[0023] Figure 9 This is a state diagram of the double welding pins of this utility model when passing through the battery electrode tab double welding pin end face flatness detection fixture.

[0024] Figure 10 This is a perspective view of the battery tab double welding pin end face flatness detection fixture according to Embodiment 2 of this utility model.

[0025] Figure 11 This is a state diagram of the right welding pin in the battery tab double welding pin end face flatness detection fixture of Embodiment 2 of this utility model.

[0026] Figure 12 This is a state diagram of the left welding pin in the battery tab double welding pin end face flatness detection fixture of Embodiment 2 of this utility model. Detailed Implementation

[0027] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0028] Please see Figures 4 to 7 The figure shows the structure of a battery tab double welding pin end face flatness testing fixture 100 according to Embodiment 1 of this utility model. The battery tab double welding pin end face flatness testing fixture 100 includes a base 1 and an inspection block 2. One end of the base 1 is provided with a first detection part 11, the surface of which is provided with a first detection plane 111. The inspection block 2 is fixedly disposed on the first detection plane 111. One end of the inspection block 2 is provided with a second detection part 21, the surface of which is provided with a second detection plane 211. The first detection plane 111 and the second detection plane 211 form a stepped structure; the height of the second detection plane 211 is greater than the height of the first detection plane 111, and the height difference between the two is less than or equal to 0.5 mm. The base 1 and the inspection block 2 are detachably connected or integrally formed. The base 1 and the inspection block 2 are made of bakelite. A level (not shown) is provided on the base 1. Please see again Figures 4 to 7 The base 1 has a first limiting part 12 at the end away from the inspection block 2. The surface of the first limiting part 12 has a first stepped surface 121, the height of which is greater than the height of the first detection plane 111. The first limiting part 12, the first detection plane 111, and the second detection part 21 form an upward-opening welding needle groove 3. By setting the welding needle groove 3, the longer welding needles 200 can be limited, preventing the two welding needles 200 from deviating during inspection, and ensuring the convenience and accuracy of each inspection.

[0029] Please see again Figure 4 and Figure 5 The width of the welding needle groove 3 is greater than the diameter of one welding needle 200 but less than the diameter of two welding needles 200. This prevents two welding needles 200 from moving out of the welding needle groove 3 at the same time, thereby avoiding detection failure and ensuring accurate detection each time.

[0030] Please see again Figures 4 to 7 The other end of the inspection block 2 is provided with a second limiting part 22. The surface of the second limiting part 22 is provided with a second stepped surface 221. The height of the second stepped surface 221 is greater than the height of the second detection plane 211. The second limiting part 22 can prevent the welding pin 200 on the second detection plane 211 from deviating, ensuring the convenience and accuracy of each inspection.

[0031] Please see again Figure 4 The length of the first detection part 11 is greater than the length of the second detection part 21, such that at least one of the front or rear surface of the first detection part 11 extends relative to the second detection part 21, forming an alignment plane 112 for aligning the two welding pins 200. By setting the alignment plane 112, the two welding pins 200 can be aligned with the first detection plane 111 before detection, ensuring that the longer welding pin 200 is always in contact with the first detection plane 111, thereby ensuring the accuracy of the detection.

[0032] Combination Figure 8 and Figure 9 During testing, the end faces of the two welding needles 200 are first leveled. Then, the testing fixture 100 of this solution is brought close to the two welding needles 200, so that the alignment plane 112 abuts against the two welding needles 200. (If the end faces of the two welding needles 200 are not level, only the welding needle 200 with the longer end abuts against the alignment plane 112.) The longer welding needle 200 is aligned with the welding needle groove 3, while the shorter welding needle 200 is aligned with the end face of the second testing section 21. At this time, the testing fixture 100 is gently pushed (keeping the alignment plane 112 abutting against the welding needles during the movement). Several longer welding needles 200 can enter the welding needle groove 3, and the shorter welding needles 200 can pass over the end face of the second testing section 21 and be located above the second testing plane 211. If this is the case, the flatness of the end faces of the two welding needles 200 is unqualified. Conversely, if several shorter welding needles 200 are blocked by the end face of the second detection unit 21, and longer welding needles 200 cannot enter the welding needle groove 3, then the end face flatness of the two welding needles 200 is qualified.

[0033] Compared with the prior art, this utility model sets up a base 1 and an inspection block 2. A first inspection plane 111 is set on the first inspection part 11 of the base 1, and a second inspection plane 211 is set on the second inspection part 21 of the inspection block 2. The height of the second inspection plane 211 is greater than the height of the first inspection plane 111, and the height difference between the two is between 0-0.5mm. Since this height difference is set as the maximum value for the acceptable alignment deviation of the end faces of the two welding needles 200, during inspection, it is only necessary to align the longer welding needle 200 with the first inspection plane 111 of the first inspection part 11, and then align the shorter welding needle 200 with the second inspection part 21. Then, the entire inspection fixture 100 is moved, and it is observed whether the shorter welding needle 200 can pass over the end face of the second inspection part 21 and pass through the second inspection plane 211. If the test passes smoothly, it indicates that the end face alignment deviation of the two welding pins 200 is greater than 0.5mm, and their flatness is unqualified. Conversely, if the test fails, it indicates that the end face alignment deviation of the two welding pins 200 is less than 0.5mm, and their flatness is qualified. Therefore, workers only need to move the testing fixture 100 to quickly perform the test. The test is very simple and accurate, and it requires low worker skill, saving time and effort.

[0034] Please see Figures 10 to 12 The figure shows the structure of the battery tab double welding pin end face flatness detection fixture 100' according to Embodiment 2 of this utility model. The battery tab double welding pin end face flatness detection fixture 100' includes a base 1' and an inspection block 2'. One end of the base 1' is provided with a first detection part 11', and the surface of the first detection part 11' is provided with a first detection plane 111'. The inspection block 2' is fixedly disposed on the first detection plane 111'. The inspection block 2' is provided with a second detection part 21', and the surface of the second detection part 21' is provided with a second detection plane 211'. The first detection plane 111' and the second detection plane 211' form a stepped structure; the height of the second detection plane 211' is greater than the height of the first detection plane 111'. Specifically, in this embodiment, the surface of the second detection part 21' is provided with three second detection planes 211', and a three-step structure is formed on the second detection part 21'. Each step is provided with a second detection plane 211', and the second detection planes 211' are arranged sequentially with increasing heights, and there is a height difference between adjacent second detection planes 211'. The height difference between adjacent second detection planes 211' is 0.1mm. By setting multiple second detection planes 211', the height difference between the two welding pins 200 can be accurately detected, and it is applicable to the requirements of different double-pin welding pairs of welding pins 200. The second detection parts 21' are arranged at intervals and symmetrically on both sides of the base 1'. This allows for the separate detection of the left and right welding pins 200, improving the accuracy of the detection.

[0035] For example Figure 10 As shown, the base 1' has first limiting portions 12' on its opposite side edges. The surface of each first limiting portion 12' has a first stepped surface 121', the height of which is greater than the height of the first detection plane 111'. The outer side of the second detection portion 21' is fitted against the inner side of the first limiting portion 12' on the same side. An inlet 101' is formed between the two first limiting portions 12' located at the front end of the base 1', and an upward-opening welding needle groove 3' is formed between two adjacent second detection portions 21' and the first detection plane 111'. The welding needle groove 3' communicates with the inlet 101'. The extending direction of the welding needle groove 3' is parallel to the arrangement direction of the second detection planes 211'. By providing the welding needle groove 3', longer welding needles 200 can enter, while shorter welding needles 200 can be positioned above the second detection portion 21'. The width of the welding needle groove 3' is equal to the center distance between the two welding needles 200. The width of the second detection plane 211' is equal to the diameter of the welding pin 200. The height difference between the first step surface 121' and the first detection plane 111' is 0.5mm. The base 1' and the inspection block 2' are integrally formed. The base 1' and the inspection block 2' are made of bakelite.

[0036] The length of the first detection part 11' is greater than the length of the second detection part 21', so that the front end surface of the first detection part 11' extends relative to the second detection part 21', forming an alignment plane 112' for the two welding pins 200 to be aligned.

[0037] Please see again Figure 10 A level 4' is provided at the end of the base 1' furthest from the inlet 101'. By setting the level 4', operators can operate more precisely, effectively reducing errors during the testing process and improving the accuracy of the test.

[0038] For example Figure 10 , 11As shown in Figure 12, when the shorter welding needle 200 is on the right side, the detection fixture 100 is horizontally placed below the two welding needles 200, requiring the water droplet in the level 4' embedded in the detection fixture 100 to be in the middle position. Then, the detection fixture 100 is gently and steadily lifted upwards, so that the lower end of the longer welding needle 200 on the left side abuts against the first detection plane 111', and the shorter welding needle 200 is close to the inner side of the first limiting part 12' on the same side. After that, the detection fixture 100 is gently pushed forward while keeping the water droplet in the level 4' in the middle position. When the shorter welding needle 200 cannot be pushed into the second detection plane 211' of the first step, it can be determined that the height difference between the shorter welding needle 200 and the longer welding needle 200 on the right side is less than 0.1 mm. Conversely, if the shorter welding needle 200 can be pushed into the second detection plane 211' of the first step but not into the second detection plane 211' of the second step, then the height difference between the shorter and longer welding needles 200 on the right side is greater than 0.1mm and less than 0.2mm. Similarly, if the shorter welding needle 200 can be pushed into the second detection plane 211' of the second step but not into the second detection plane 211' of the third step, then the height difference between the shorter and longer welding needles 200 on the right side is greater than 0.2mm and less than 0.3mm. When the height difference between the lower end of the welding needle 200 on the right side and the first detection plane 111' is within the required deviation range, the next production operation can be carried out; otherwise, the position of the lower end faces of the two welding needles 200 needs to be readjusted and recalibrated until they pass the test. Similarly, the shorter welding pin 200 on the left can also be inspected. This can be done using the second inspection section 21' located on the left side of the inspection fixture 100', and the inspection process is the same as that for the welding pin 200 on the right. The above description discloses only preferred embodiments of this utility model and should not be construed as limiting the scope of this utility model. Therefore, any equivalent variations made within the scope of this utility model are still within its coverage.

Claims

1. A fixture for detecting the flatness of the end faces of double welding pins on battery tabs, characterized in that: The device includes a base and an inspection block. One end of the base is provided with a first detection part, and the surface of the first detection part is provided with a first detection plane. The inspection block is fixedly disposed on the first detection plane. One end of the inspection block is provided with a second detection part, and the surface of the second detection part is provided with a second detection plane. The first detection plane and the second detection plane form a stepped structure. The height of the second detection plane is greater than the height of the first detection plane, and the height difference between the two is less than or equal to 0.5 mm.

2. The battery tab double welding pin end face flatness detection fixture according to claim 1, characterized in that: The base is provided with a first limiting part at one end away from the inspection block. The surface of the first limiting part is provided with a first stepped surface. The height of the first stepped surface is greater than the height of the first detection plane. The first limiting part, the first detection plane and the second detection part form an upward-opening welding needle groove.

3. The battery tab double welding pin end face flatness detection fixture according to claim 2, characterized in that: The width of the welding needle groove is greater than the diameter of one welding needle but less than the diameter of two welding needles.

4. The battery tab double welding pin end face flatness detection fixture according to claim 1, characterized in that: The other end of the inspection block is provided with a second limiting part, and the surface of the second limiting part is provided with a second step surface, the height of the second step surface being greater than the height of the second detection plane.

5. The battery tab double welding pin end face flatness detection fixture according to claim 1, characterized in that: The length of the first detection part is greater than the length of the second detection part, so that at least one of the front end surface or the rear end surface of the first detection part extends relative to the second detection part, forming an alignment plane for the two welding needles to be aligned.

6. The fixture for detecting the flatness of the double welding pin end faces of the battery tabs according to claim 1, characterized in that: The surface of the second detection unit is provided with a plurality of second detection planes, which are arranged sequentially and their heights increase sequentially, with a height difference between adjacent second detection planes.

7. The battery tab double welding pin end face flatness detection fixture according to claim 6, characterized in that: The height difference between two adjacent second detection planes is 0.1 mm.

8. The fixture for detecting the flatness of the double welding pin end faces of the battery tabs according to claim 1, characterized in that: A level is provided at one end of the base.

9. The battery tab double welding pin end face flatness detection fixture according to claim 6, characterized in that: The second detection units are arranged at intervals and symmetrically on opposite sides of the base.

10. The battery tab double welding pin end face flatness detection fixture according to any one of claims 1 to 9, characterized in that: The base and the inspection block are either detachably connected or integrally formed.

Images