Detachable resistance welding pin
By designing a decomposed resistance welding needle, the problem of existing welding needles being scrapped due to wear of welding heads is solved, and the welding heads are easily maintained and replaced, the utilization rate of the welding body is improved and the cost is reduced.
Patent Information
- Application Number
- CN202421094720.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The existing resistance welding needles are not disassembled from the welding body, which leads to frequent use of welding heads, which makes the welding head wear out, inconvenient operation, and the inability to replace the welding heads, resulting in the scrapping of the entire welding needle, which increases the cost.
A detachable resistance welding needle is designed, which can be disassembled between the welding head and the welding body. The welding head can be polished separately and replaced when worn or when materials need to be replaced without discarding the welding body.
Through the decomposed design, the maintainability and utilization of the welding head is improved, the depreciation of the welding body is reduced, and the overall cost is reduced.
Smart Images
Figure CN222740512U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a resistance welding pin for welding a current collector and a bottom shell in a secondary battery (for example but not limited to a lithium battery), in particular to a detachable resistance welding pin. Background Art
[0002] With the vigorous development of the new energy industry, a huge market is provided for the battery industry, thereby accelerating the pace of development of the battery industry.
[0003] At present, lithium-ion cylindrical batteries have gradually become the mainstream products in the new energy industry due to their advantages such as high energy density, high charge and discharge rate, and good capacity consistency.
[0004] In the production process of lithium-ion cylindrical batteries, resistance welding is generally used to weld the current collector (such as but not limited to the current collector plate) to the bottom of the battery shell. Therefore, the use of resistance welding needles is indispensable.
[0005] However, the welding head and welding body of the existing resistance welding needle cannot be disassembled, so the existing resistance welding needle has the following problems:
[0006] Since the resistance welding needle is used frequently, the wear rate of the resistance welding needle is accelerated; and the effective use part of the resistance welding needle is the tip end of the welding head, so the tip end of the welding head needs to be polished every time the welding needle is used for a period of time; when the resistance welding needle is long, the operator cannot polish the welding head well.
[0007] Meanwhile, when the tip of the welding head of the resistance welding needle is worn to a certain extent and cannot be used, the entire resistance welding needle is scrapped.
[0008] Furthermore, since different welding materials may use different welding heads, different resistance welding needles need to be replaced accordingly, so the investment cost is high.
[0009] Therefore, there is an urgent need for a detachable resistance welding pin to overcome the above-mentioned defects. Utility Model Content
[0010] The utility model aims to provide a detachable resistance welding needle, so that the welding head and the welding body can be disassembled, so the disassembled welding head can be polished separately, which is convenient to operate; at the same time, when the welding head is worn out and cannot be used, or when facing different welding materials, a new welding head can be replaced without discarding the welding body, thereby improving the utilization of the welding body and reducing the discarding of the welding body, thereby saving costs.
[0011] To achieve the above-mentioned purpose, the detachable resistance welding needle of the utility model comprises a long strip welding body and a welding head which is shorter than the welding body and is connected to the welding body in a straight line along the length direction of the welding body. The center line of the welding body is parallel to or coincides with the center line of the welding head, and the tail end of the welding head is detachably assembled and connected to the head end of the welding body.
[0012] Compared with the prior art, since the welding head and the welding body in the detachable resistance welding needle of the utility model can be disassembled, the disassembled welding head can be polished separately, and the polishing operation is more convenient; at the same time, when the welding head is worn to the point of being unusable, or when facing different welding materials, a new welding head can be replaced without discarding the welding body, thereby improving the utilization of the welding body and reducing the discarding of the welding body, thereby saving costs.
[0013] Preferably, one of the tail end of the welding head and the head end of the welding body is provided with an external thread structure, and the other of the tail end of the welding head and the head end of the welding body is provided with an internal thread structure for threaded connection with the external thread structure.
[0014] Preferably, the end face of the welding head has a main plane perpendicular to the center line of the welding head.
[0015] Preferably, the end face of the welding head further comprises an inclined annular surface surrounding the main plane and connected to the side face of the welding head end, and the inclined annular surface is also connected to the main plane.
[0016] Preferably, a plurality of protrusion structures arranged in an array are provided on the main plane.
[0017] Preferably, the protruding structure is a part of a sphere.
[0018] Preferably, all the protruding structures are arranged in a circular array.
[0019] Preferably, the end surface of the welding head is a partial spherical surface with the center of the sphere located on the center line of the welding head.
[0020] Preferably, the welding head comprises a first cylinder, a table and a second cylinder connected in sequence along the direction from the head end to the tail end, the first cylinder, the second cylinder and the welding body are cylinders or regular prisms, and the table is a regular prism or a truncated table correspondingly.
[0021] Preferably, the length of the second column is shorter than the lengths of the first column and the platform. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a three-dimensional diagram of a detachable resistance welding pin according to the first embodiment of the utility model.
[0023] Figure 2 yes Figure 1 A plan view of a detachable resistance welding pin is shown.
[0024] Figure 3 yes Figure 1 The detachable resistance welding needle is shown in a three-dimensional exploded view when the welding head and the welding body are separated.
[0025] Figure 4 It is a plan view of a detachable resistance welding pin according to the second embodiment of the utility model.
[0026] Figure 5 It is a three-dimensional diagram of a detachable resistance welding pin according to the third embodiment of the utility model.
[0027] Figure 6 yes Figure 5 A plan view of a detachable resistance welding pin is shown. DETAILED DESCRIPTION
[0028] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements.
[0029] See also Figures 1 to 3 The detachable resistance welding needle 100a of the first embodiment includes a long strip welding body 10 and a welding head 20 which is shorter than the welding body 10 and is connected to the welding body 10 in a straight line along the length direction of the welding body 10 (i.e., the direction indicated by arrow A), so that the detachable resistance welding needle 100 of the first embodiment is in the shape of a straight rod. The center line of the welding body 10 coincides with the center line of the welding head 20, and the coincident center lines are shown in FIG. Figure 2 As shown in the center line in, on the one hand, it is convenient for manufacturing and processing of the detachable resistance welding needle 100a of the first embodiment, and on the other hand, it ensures that the center line of the force applied by the external pressure head to the tail end 12 of the welding body 10, the center line of the welding body 10 and the center line of the welding head 20 coincide with each other, thereby ensuring the reliability of the welding head 20 abutting against the current collecting plate in the battery shell during welding; Obviously, according to actual needs, the center line of the welding body 10 can also be made parallel to the center line of the welding head 20, so it is not necessary to Figure 2 Limits shown.
[0030] The tail end of the welding head 20 is detachably connected to the head end 11 of the welding body 10, so that the welding head 20 and the welding body 10 can be removed and assembled; Figure 3In the figure, as an example, the tail end of the welding head 20 is provided with an external thread structure 211, and the head end 11 of the welding body 10 is provided with an internal thread structure 111 for threaded connection with the external thread structure 211, so as to realize the detachable assembly connection between the welding head 20 and the welding body 10 by means of the cooperation of the external thread structure 211 and the internal thread structure 111, which is convenient for the disassembly and assembly operation between the welding head 20 and the welding body 10 on the one hand, and can ensure the reliability of overcurrent of the welding head 20 and the welding body 10 when assembled together on the other hand; obviously, according to actual needs, the tail end of the welding head 20 can also be provided with an internal thread structure 111 and the head end 11 of the welding body 10 can be provided with an external thread structure 211, so it is not necessary to use Figure 3 More specifically, as follows:
[0031] like Figures 1 to 3 As shown, as an example, the welding head 20 includes a first cylinder 20a, a platform 20b and a second cylinder 20c connected in sequence along the direction from the head end to the tail end. The first cylinder 20a, the second cylinder 20c and the welding body 10 are cylinders, and the platform 20b is a truncated platform. Such a design is more convenient for the processing and manufacturing of the detachable resistance welding needle 100a of the first embodiment and prevents the winding core from being damaged when the needle is inserted; in addition, with the help of the second cylinder 20c, a clamping position is provided during the processing process, and a clamping position is also provided for the grinding of the welding head 10; obviously, according to actual needs, the first cylinder 20a, the second cylinder 20c and the welding body 10 can also be regular prisms, and the platform 20b is a regular prism, so it is not necessary to Figure 1 and Figure 3 As shown. In addition, the length of the second column 20c is less than the length of the first column 20a and the platform 20b, that is, the length of the second column 20c is less than the length of the first column 20a and the length of the platform 20b, so as to reduce the proportion of the second column 20c to the welding head 20. For example, the material of the welding body 10 can be selected as aluminum oxide copper or beryllium copper to obtain better flow capacity; in addition, the material of the welding head 20 can be selected as aluminum oxide copper or beryllium copper, or tungsten or molybdenum can be inlaid on the aluminum oxide copper to obtain better flow capacity and wear resistance; obviously, in addition to the above materials, the welding body 10 and the welding head 20 can also be selected from other materials, so it is not limited to this. It should be noted that the first column 20a can be understood as the head end of the welding head 20, and the second column 20c can be understood as the tail end of the welding head 20.
[0032] like Figures 1 to 3As shown, as an example, the head end face 23 of the welding head 20 has a main plane 231 perpendicular to the center line of the welding head 20, so that the detachable resistance welding needle 100a of the first embodiment is a flat-head type welding needle to increase the welding area; in addition, the head end face 23 of the welding head 20 also has an inclined annular surface 232 surrounding the main plane 231 and connected to the head end side surface 24 of the welding head 20, and the inclined annular surface 232 is also connected to the main plane 231; with the help of the inclined annular surface 232, it is ensured that only the main plane 231 of the welding head 20 contacts the collecting plate in the battery housing during welding, and a sharp edge is avoided at the intersection of the head end face 23 of the welding head 20 and the head end side surface 24.
[0033] See also Figure 4 The structures of the detachable resistance welding pin 100b of the second embodiment are substantially the same as the detachable resistance welding pin 100a of the first embodiment, and the differences are as follows:
[0034] In the detachable resistance welding needle 100b of the second embodiment, the end face 23' of the welding head 20 is a sphere center P located at the center line of the welding head 20 (see Figure 4 The detachable resistance welding needle 100b of the second embodiment is a round-head type welding needle and has the advantages of small welding pressure and current.
[0035] In the detachable resistance welding pin 100a of the first embodiment, the head end surface 23 of the welding head 20 has a main plane 231 perpendicular to the center line of the welding head 20 and an inclined annular surface 232 surrounding the main plane 231 and connected to the head end side surface 24 of the welding head 20, so that the detachable resistance welding pin 100a of the first embodiment is a flat-head type welding pin.
[0036] Apart from the above differences, the other two are the same, so I will not go into details here.
[0037] See also Figure 5 and Figure 6 The structures of the detachable resistance welding pin 100c of the third embodiment are substantially the same as the detachable resistance welding pin 100a of the first embodiment, and the differences are as follows:
[0038] In the detachable resistance welding needle 100c of the third embodiment, a plurality of protrusion structures 25 arranged in an array are provided on the main plane 231. Optionally, as an example, the protrusion structure 25 is a part of a sphere, and all the protrusion structures 25 are arranged in a ring array together, so that the welding area is smaller than that of the welding needle with a flat head end and larger than that of the welding needle with a round head end, which can appropriately reduce the welding pressure and current.
[0039] In the detachable resistance welding pin 100 a of the first embodiment, no protruding structure 25 is disposed on its main plane 231 .
[0040] Apart from the above differences, the other two are the same, so I will not go into details here.
[0041] Compared with the prior art, since the welding head 20 and the welding body 10 in the detachable resistance welding needle 100a (100b, 100c) of the utility model can be disassembled, the disassembled welding head 20 can be polished separately, and the polishing operation is more convenient; at the same time, when the welding head 20 is worn to the point of being unusable, or when facing different welding materials, a new welding head 20 can be replaced without discarding the welding body, thereby improving the utilization of the welding body and reducing the discarding of the welding body, thereby saving costs.
[0042] However, this cannot be used to limit the scope of rights of the present utility model. Therefore, equivalent changes made according to the scope of the patent application of the present utility model are still within the scope covered by the present utility model.
Claims
1. A detachable resistance welding pin, comprising a long strip welding body and a welding head which is shorter than the welding body and is connected to the welding body in a straight line along the length direction of the welding body, wherein the center line of the welding body is parallel to or coincides with the center line of the welding head, and characterized in that: The tail end of the welding head and the head end of the welding body are detachably assembled and connected.
2. The detachable resistance welding pin according to claim 1, characterized in that: One of the tail end of the welding head and the head end of the welding body is provided with an external thread structure, and the other of the tail end of the welding head and the head end of the welding body is provided with an internal thread structure for threaded connection with the external thread structure.
3. The detachable resistance welding pin according to claim 1, characterized in that: The end face of the welding head has a main plane perpendicular to the center line of the welding head.
4. The detachable resistance welding pin according to claim 3, characterized in that: The end face of the welding head also has an inclined annular surface surrounding the main plane and connected to the side face of the welding head, and the inclined annular surface is also connected to the main plane.
5. The detachable resistance welding pin according to claim 3 or 4, characterized in that: A plurality of protrusion structures arranged in an array are provided on the main plane.
6. The detachable resistance welding pin according to claim 5, characterized in that: The protruding structure is a part of a sphere.
7. The detachable resistance welding pin according to claim 5, characterized in that: All the protruding structures are arranged together in a ring array.
8. The detachable resistance welding pin according to claim 1, characterized in that: The end face of the welding head is a partial spherical surface with the center of the sphere located on the center line of the welding head.
9. The detachable resistance welding pin according to claim 8, characterized in that: The welding head comprises a first cylinder, a table and a second cylinder connected in sequence along the direction from the head end to the tail end. The first cylinder, the second cylinder and the welding body are cylinders or regular prisms, and the table is a regular prism or a truncated table.
10. The detachable resistance welding pin according to claim 9, characterized in that: The length of the second column is shorter than the length of the first column and the stage.