Spot welding machine for lithium battery assembly

Abstract

The utility model discloses a spot welder is assembled with lithium cell, relates to lithium cell welding technical field, including by workstation, support station, welder host computer, pneumatic slide table subassembly, spot welder subassembly that welds, the top of workstation places and has mobile subassembly, mobile subassembly is used for providing positioning for the assembly of multiple lithium cell, realizes the convenient movement of lithium group simultaneously, the top of workstation still is provided with alignment subassembly, and the alignment subassembly provides the limit for the movement of mobile subassembly, realizes the alignment of lithium group welding position and weld pin simultaneously. The utility model discloses through setting mobile subassembly can make the movement of lithium cell group welding more relaxed, and through mobile subassembly and alignment subassembly cooperation, can realize the quick alignment of lithium cell and weld pin, and positioning alignment no longer relies on experience judgment, and the operation is simpler, can effectively improve operating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery welding technology, specifically a spot welding machine for lithium battery assembly. Background Technology

[0002] Lithium battery spot welding machines are core equipment specifically used for welding metal connecting pieces (such as nickel sheets, copper-nickel composite sheets, aluminum sheets, etc.) to battery electrodes in lithium battery packs. Their core principle is resistance spot welding, which uses a high instantaneous current to generate high temperature at the contact point, causing the metal to melt locally and form a weld nugget.

[0003] There is a type of pneumatic spot welding machine on the market, and its operating principle is as follows:

[0004] Driven by a pneumatic system, two electrodes (welding needles) precisely and quickly press the metal sheet to be welded (such as a nickel sheet) and the battery electrodes (positive and negative terminals) together. At the same time as or very shortly after the electrodes are pressurized, the controller releases a brief but powerful DC pulse current (usually in the millisecond range) through the pressed metal contact point. As the current flows through the contact point (between the nickel sheet and the battery electrode), Joule heating is generated in the local area due to the contact resistance. The heat generated is sufficient to make the metal at the contact point instantly reach a molten or plastic state. After that, the current stops, and the electrodes continue to maintain pressure (holding pressure time). The molten metal cools and solidifies under pressure, forming a strong weld nugget that welds the nickel sheet and the battery electrode together. Then, the pneumatic system drives the electrodes to lift, completing one welding cycle.

[0005] When assembling and welding lithium batteries using a manual pneumatic spot welding machine (i.e., the pneumatic system is controlled by a foot switch), the assembled lithium battery pack needs to be manually moved to align the welding point with the welding needle. During this process, the frictional resistance between the lithium battery pack and the worktable is relatively large, making it difficult to move large battery packs. Furthermore, the alignment of the welding point with the welding needle relies on experience, which is inconvenient. Therefore, this paper provides a spot welding machine for assembling lithium batteries. Utility Model Content

[0006] The purpose of this utility model is to provide a spot welding machine for assembling lithium batteries in order to solve the problems mentioned above.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a spot welding machine for assembling lithium batteries, comprising a spot welding machine assembly consisting of a worktable, a support platform, a welding machine host, a pneumatic slide assembly, and welding needles. The support platform is fixed above the rear end of the worktable, the welding machine host is mounted and fixed on the top of the support platform, the pneumatic slide assembly is mounted on the front end of the welding machine host, and the welding needles are mounted at the bottom of the output end of the pneumatic slide assembly and electrically connected to the welding machine host controller via a cable. A movable component is placed on the top of the worktable, which is used to provide positioning for the assembly of multiple lithium batteries and to facilitate the movement of the lithium battery pack.

[0008] The top of the workbench is also provided with an alignment component, which provides a limit for the movement of the moving component and at the same time realizes the alignment of the lithium battery assembly welding position with the welding needle.

[0009] As a further embodiment of this utility model: the moving component includes a moving base, a rectangular base plate, moving balls, an inverted placement groove, and a splicing positioning groove;

[0010] The rectangular base plate is installed on the bottom of the movable seat by bolts, and the movable ball is rolled inside the bottom of the movable seat and passes through the bottom of the rectangular base plate. The movable seat and the rectangular base plate are provided with rolling grooves for the movable ball to roll.

[0011] The movable ball bearings are evenly arranged in a rectangular trajectory of the movable seat;

[0012] The inverted placement groove is located on the top of the movable base, and the splicing positioning groove is located on the bottom of the inner wall of the inverted placement groove. The splicing positioning groove is used to provide positioning for the lithium battery. The assembly of the lithium battery is achieved by placing multiple lithium batteries sequentially inside the multiple splicing positioning grooves.

[0013] Multiple moving ball bearings contact the surface of the worktable and roll to facilitate the movement of the lithium battery pack.

[0014] As a further embodiment of this utility model: the alignment assembly includes a fixed cylindrical column, a positioning ball, a lifting block, and a spring;

[0015] The fixed cylinder is fixed to the top of the worktable. The positioning ball, the lifting block, and the spring are distributed from top to bottom on the inner side of the fixed cylinder. The top of the lifting block protrudes to the top of the fixed cylinder. The fixed cylinder has a cavity inside for the positioning ball, the lifting block, and the spring to extend and retract.

[0016] The bottom of the movable seat is integrally formed with a rectangular groove, and the bottom of the splicing positioning groove is provided with a welding positioning hole that penetrates into the rectangular groove.

[0017] When the movable seat is placed on the top of the workbench, it is sleeved on the outside of the fixed cylinder through a rectangular groove. The fixed cylinder is used to limit the movement position of the movable seat.

[0018] The top of the positioning ball is engaged with the inside of the welding positioning hole to achieve the position positioning of the moving seat.

[0019] As a further improvement of this utility model, the center line of the positioning ball coincides with the center line of the two welding pins.

[0020] As a further embodiment of this utility model: the inner diameter of the splicing positioning groove matches the outer diameter of the lithium battery, the number and position of the splicing positioning groove are set according to the number and arrangement requirements of the lithium battery, the number and position of the welding positioning hole correspond one-to-one with the splicing positioning groove, and the height of the part of the positioning ball that is engaged with the welding positioning hole is less than the height of the welding positioning hole.

[0021] As a further improvement of this invention, the shape of the inverted placement groove matches the shape of multiple lithium battery assemblies.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] By setting up a moving component, the movement of the lithium battery pack during welding becomes easier. Furthermore, by cooperating with the alignment component, the lithium battery and the welding pin can be quickly aligned. Positioning and alignment no longer rely on experience judgment, making the operation simpler and effectively improving operational efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram showing the movable component of this utility model in its separated state from the worktable.

[0026] Figure 3 This is a schematic diagram of the bottom structure of the movable component of this utility model;

[0027] Figure 4 This is a structural cross-sectional view of the mobile component of this utility model;

[0028] Figure 5 This is a cross-sectional view of the alignment component of this utility model.

[0029] In the diagram: 1. Spot welding machine assembly; 101. Workbench; 102. Support platform; 103. Welding machine main unit; 104. Pneumatic slide assembly; 105. Welding needle; 2. Moving assembly; 201. Moving seat; 202. Rectangular base plate; 203. Moving ball; 204. Inverted placement groove; 205. Splicing positioning groove; 206. Welding positioning hole; 207. Rectangular groove; 3. Alignment assembly; 301. Fixed cylinder; 302. Positioning ball; 303. Lifting block; 304. Spring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-5 In this embodiment of the utility model, a spot welding machine for assembling lithium batteries includes a spot welding machine assembly 1 consisting of a worktable 101, a support platform 102, a welding machine host 103, a pneumatic slide assembly 104, and welding needles 105. The support platform 102 is fixed above the rear end of the worktable 101. The welding machine host 103 is mounted and fixed on the top of the support platform 102. The pneumatic slide assembly 104 is mounted on the front end of the welding machine host 103. The welding needles 105 are mounted on the bottom of the output end of the pneumatic slide assembly 104 and are electrically connected to the controller of the welding machine host 103 via a cable. A moving component 2 is placed on the top of the worktable 101. The moving component 2 is used to provide positioning for the assembly of multiple lithium batteries and to realize convenient movement of the lithium battery pack.

[0032] The top of the workbench 101 is also provided with an alignment component 3, which provides a limit for the movement of the moving component 2 and at the same time realizes the alignment of the lithium battery welding position with the welding pin 105.

[0033] The movable component 2 includes a movable base 201, a rectangular base plate 202, movable ball bearings 203, an inverted placement groove 204, and a splicing positioning groove 205;

[0034] The rectangular base plate 202 is installed on the bottom of the movable seat 201 by bolts, and the movable ball 203 is rolled inside the bottom of the movable seat 201 and passes through the bottom of the rectangular base plate 202. The movable seat 201 and the rectangular base plate 202 are provided with rolling grooves for the movable ball 203 to roll.

[0035] Multiple movable ball bearings 203 are evenly arranged along the rectangular trajectory of the movable base 201;

[0036] An inverted placement groove 204 is formed on the top of the movable base 201, and a splicing positioning groove 205 is formed on the bottom of the inner wall of the inverted placement groove 204. The splicing positioning groove 205 is used to provide positioning for the lithium battery. The assembly of the lithium battery is achieved by placing multiple lithium batteries in the multiple splicing positioning grooves 205 in sequence.

[0037] Multiple movable ball bearings 203 contact the upper surface of the worktable 101 and roll, which is used to facilitate the movement of the lithium battery pack.

[0038] Alignment component 3 includes a fixed cylinder 301, a positioning ball 302, a lifting block 303, and a spring 304;

[0039] The fixed cylinder 301 is fixed to the top of the worktable 101. The positioning ball 302, the lifting block 303, and the spring 304 are distributed from top to bottom on the inner side of the fixed cylinder 301. The top of the lifting block 303 protrudes to the top of the fixed cylinder 301. The fixed cylinder 301 has a cavity inside for the positioning ball 302, the lifting block 303, and the spring 304 to extend and retract.

[0040] The bottom of the movable base 201 is integrally formed with a rectangular groove 207, and the bottom of the splicing positioning groove 205 is provided with a welding positioning hole 206 that penetrates to the rectangular groove 207.

[0041] When the movable seat 201 is placed on the top of the workbench 101, it is sleeved on the outside of the fixed cylinder 301 through the rectangular groove 207. The fixed cylinder 301 is used to limit the movement position of the movable seat 201.

[0042] The center line of the positioning ball 302 coincides with the center line of the two welding pins 105, and the top of the positioning ball 302 is engaged with the inside of the welding positioning hole 206 to realize the position positioning of the moving seat 201.

[0043] In this embodiment, it should be noted that the spot welding machine is mainly used for welding cylindrical batteries (such as 18650, 21700, etc.). The welding machine host 103 is a common type of lithium battery pneumatic spot welding machine on the market. Therefore, the internal structure of the welding machine host 103 will not be described in detail here.

[0044] When using this spot welding machine assembly 1 for lithium battery assembly welding, the usage method is as follows:

[0045] First, place the movable seat 201 on the worktable 101 and fit it onto the outside of the alignment component 3 through the rectangular groove 207, with its moving ball 203 contacting the upper surface of the worktable 101.

[0046] Next, multiple lithium batteries are placed sequentially in multiple splicing positioning slots 205 to achieve splicing of multiple lithium batteries. Then, the metal sheet to be welded (such as a nickel sheet) is attached to the electrodes (positive and negative electrodes) on the top of the battery.

[0047] Then, the entire moving base 201 is moved. During this process, the rolling of the moving ball 203 can effectively reduce the moving resistance and realize the convenient movement of the lithium battery pack. At the same time, during the movement of the moving base 201, when the positioning ball 302 contacts the top of the inner wall of the rectangular groove 207, the positioning ball 302 is squeezed upward by the top of the inner wall of the rectangular groove 207, causing the lifting block 303 to move down and squeeze the spring 304 to further contract. When the positioning ball 302 is aligned with any welding positioning hole 206, the positioning ball 302 will move up and get stuck in the welding positioning hole 206 under the elastic force of the spring 304. The sound and vibration generated by the collision of the positioning ball 302 can help the operator quickly judge this state. At this time, one lithium battery electrode is aligned with the welding needle 105.

[0048] Then, the pneumatic slide assembly 104 can be operated by the foot switch, so that the welding pin 105 moves down to weld and fix the lithium battery electrode to the metal sheet. After the welding pin 105 is reset, the moving seat 201 can be moved according to the above operation method to realize the welding operation of the lithium battery pack.

[0049] After welding is completed, manually rotate the entire lithium battery pack 180 degrees so that the other electrode of the lithium battery is facing upwards and the welded metal sheet is facing downwards and located inside the placement groove 204 (at this time, the lithium battery is not inserted into the positioning groove 205). Then repeat the above operation to weld the other electrode to the metal sheet.

[0050] The combination of these components makes the movement of the lithium battery pack easier during welding, and positioning and alignment no longer rely on experience, making the operation simpler and effectively improving operational efficiency.

[0051] Please refer to this carefully. Figures 1-5 The inner diameter of the splicing positioning groove 205 matches the outer diameter of the lithium battery. The number and position of the splicing positioning groove 205 are set according to the number and arrangement requirements of the lithium battery. The number and position of the welding positioning hole 206 correspond one-to-one with the splicing positioning groove 205, and the height of the part of the positioning ball 302 that is engaged with the welding positioning hole 206 is less than the height of the welding positioning hole 206.

[0052] The shape of the inverted placement groove 204 matches the shape of multiple lithium battery assemblies.

[0053] In this embodiment: the inverted placement groove 204 is designed to provide inverted placement positioning for a lithium battery pack with one electrode welded on, so that when the lithium battery pack is placed after being flipped, the lithium battery is still aligned with the splicing positioning groove 205, thereby ensuring the alignment operation during secondary welding.

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A spot welding machine for assembling lithium battery, comprising a spot welding machine assembly (1) composed of a workbench (101), a support table (102), a welding machine main machine (103), a pneumatic sliding table assembly (104), and a welding needle (105), the support table (102) is fixed to the rear end above the workbench (101), the welding machine main machine (103) is fixedly installed on the top of the support table (102), the pneumatic sliding table assembly (104) is installed at the front end of the welding machine main machine (103), and the welding needle (105) is installed at the bottom of the output end of the pneumatic sliding table assembly (104) and is electrically connected with the controller of the welding machine main machine (103) through a cable, characterized in that, A movable component (2) is placed on top of the workbench (101). The movable component (2) is used to provide positioning for the assembly of multiple lithium batteries and to facilitate the movement of the lithium battery pack. The top of the workbench (101) is also provided with an alignment component (3), which provides a limit for the movement of the moving component (2) and at the same time realizes the alignment of the lithium battery welding position with the welding needle (105).

2. The spot welder for assembling a lithium battery according to claim 1, wherein The moving component (2) includes a moving base (201), a rectangular base plate (202), a moving ball (203), an inverted placement groove (204), and a splicing positioning groove (205); The rectangular base plate (202) is installed on the bottom of the movable seat (201) by bolts, and the movable ball (203) is rolled inside the bottom of the movable seat (201) and passes through the bottom of the rectangular base plate (202). The movable seat (201) and the rectangular base plate (202) are provided with rolling grooves for the movable ball (203) to roll. The movable ball bearings (203) are evenly arranged in multiple ways along the rectangular trajectory of the movable seat (201); The inverted placement groove (204) is opened on the top of the movable seat (201), and the splicing positioning groove (205) is opened on the bottom of the inner wall of the inverted placement groove (204). The splicing positioning groove (205) is used to provide positioning for lithium batteries. The assembly of lithium batteries is achieved by placing multiple lithium batteries in multiple splicing positioning grooves (205) in sequence. The lithium battery pack is moved easily by having multiple moving balls (203) contact the upper surface of the worktable (101) and roll.

3. The spot welder for assembling a lithium battery according to claim 2, wherein The alignment assembly (3) includes a fixed cylinder (301), a positioning ball (302), a lifting block (303), and a spring (304); The fixed cylinder (301) is fixed to the top of the worktable (101). The positioning ball (302), the lifting block (303), and the spring (304) are distributed from top to bottom on the inner side of the fixed cylinder (301). The top of the lifting block (303) protrudes to the top of the fixed cylinder (301). The fixed cylinder (301) has a cavity inside for the positioning ball (302), the lifting block (303), and the spring (304) to extend and retract. The bottom of the movable seat (201) is integrally formed with a rectangular groove (207), and the bottom of the splicing positioning groove (205) is provided with a welding positioning hole (206) that penetrates to the rectangular groove (207). When the movable seat (201) is placed on the top of the workbench (101), it is sleeved on the outside of the fixed cylinder (301) through the rectangular groove (207). The fixed cylinder (301) is used to limit the movement position of the movable seat (201). The top of the positioning ball (302) is engaged with the inside of the welding positioning hole (206) to achieve the position positioning of the moving seat (201).

4. The spot welder for assembling lithium batteries according to claim 3, characterized in that, The centerline of the positioning ball (302) coincides with the centerline of the two welding pins (105).

5. The spot welder for assembling lithium batteries according to claim 3, characterized in that, The inner diameter of the splicing positioning groove (205) matches the outer diameter of the lithium battery, the number and position of the splicing positioning groove (205) are set according to the number and arrangement requirement of the lithium battery, the number and position of the welding positioning hole (206) correspond to the splicing positioning groove (205) one by one, and the height of the part where the positioning ball (302) is clamped in the welding positioning hole (206) is less than the height of the welding positioning hole (206).

6. The spot welder for assembling lithium batteries according to claim 5, characterized in that, The shape of the inverted placement groove (204) matches the assembly shape of the plurality of lithium batteries.

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