Lithium ion laminated battery tab welding jig

Abstract

The utility model discloses a kind of lithium ion lamination cell tab welding jigs, including jig lower mould and jig upper mould, the accommodating recess for accommodating laminated core is equipped on the jig lower mould;The first recess and the second recess of side by side arrangement are equipped on the bottom of the jig upper mould;First magnet is equipped inside the first recess, negative tab is adsorbed on the first magnet;Positive tab is equipped inside the second recess, one side of the second recess is equipped with third recess, sliding block is equipped in the third recess, the sliding block slides along third recess to the second recess, the end of the sliding block is inserted into the second recess interior, and positive tab is fixed;The jig lower mould and jig upper mould are mutually covered;The utility model does not need to fix positive tab by means of double-sided adhesive, reduce cost, improve efficiency, also avoid the adverse effect caused by double-sided adhesive residue to welding quality and subsequent battery pack connection.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion stacked battery technology, and in particular to a welding fixture for lithium-ion stacked battery tabs. Background Technology

[0002] Lithium-ion batteries, as a type of rechargeable battery, have advantages such as high energy density, long cycle life, wide operating temperature range, high safety, green environmental protection, high economy, and no memory effect. Therefore, they are widely used in various fields of life, such as electronic products, drones, electric vehicles, and energy storage.

[0003] Currently, during the welding process of the stacked core and the electrode tabs, a fixture is needed to fix the stacked core and the electrode tabs separately before welding can proceed. Specifically, the stacked core is placed in the lower film of the fixture, which has grooves for accommodating the stacked core. The electrode tabs are divided into positive and negative electrode tabs, with the positive electrode tab being an aluminum tab and the negative electrode tab being a nickel tab. The electrode tabs are fixed to the bottom of the upper film of the fixture. The negative electrode tab is fixed by magnetic attraction, while the positive electrode tab is fixed by double-sided tape, i.e., double-sided tape is adhered between the positive electrode tab and the bottom of the upper film of the fixture.

[0004] This necessitates the application of double-sided tape when securing the positive electrode tab, reducing operator efficiency. Furthermore, the tape causes the positive electrode tab and its welded connection to the stacked core to pull and tug when the stack is removed after welding, affecting the welding result. Additionally, residual double-sided tape on the positive electrode tab surface can interfere with the contact connection between the tabs, negatively impacting subsequent battery pack welding. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology in which the positive electrode tab needs to be fixed with double-sided tape, and to provide a welding fixture for the electrode tabs of lithium-ion stacked batteries. This fixture does not require the use of double-sided tape to fix the positive electrode tab, which reduces costs, improves operating efficiency, and avoids the adverse effects of double-sided tape residue on welding quality and subsequent battery pack connection.

[0006] To achieve the above objectives, this utility model provides a welding fixture for electrode tabs of lithium-ion stacked batteries, including a lower fixture mold and an upper fixture mold. The lower fixture mold is provided with a receiving groove for accommodating the stacked cores. The bottom of the upper fixture mold is provided with a first groove and a second groove arranged side by side. A first magnet is installed inside the first groove, and a negative electrode tab is attracted to the first magnet. A positive electrode tab is installed inside the second groove. A third groove is provided on one side of the second groove. A sliding block is installed in the third groove. The sliding block slides along the third groove toward the second groove, and the end of the sliding block is inserted into the second groove to fix the positive electrode tab. The lower fixture mold and the upper fixture mold cover each other.

[0007] Preferably, the sliding block is made of magnetic material, and a second magnet is installed inside the second groove. The second magnet is in contact with the positive electrode tab and magnetically fixes one end of the sliding block.

[0008] Preferably, a fourth groove is provided at the end of the third groove away from the second groove, and a third magnet is installed inside the fourth groove. The third magnet attracts and fixes the sliding block, magnetically fixing the sliding block to the end of the third groove away from the second groove.

[0009] Preferably, the sliding block is L-shaped; one end of the sliding block enters the second groove to contact and press the positive electrode tab tightly, while the other end is limited by the third groove; a push rod is installed at one end of the sliding block, and the push rod pushes the sliding block to move laterally inside the third groove.

[0010] Preferably, the upper mold of the fixture is provided with a connecting hole on one side, the connecting hole is connected to the third groove, the push rod passes through the connecting hole and is inserted into the sliding block, and the push rod and the sliding block are fixedly connected by bolts.

[0011] Preferably, the negative electrode tab is limited by a first groove; the positive electrode tab is limited by a second groove.

[0012] Preferably, the lower surface of the sliding block is flush with the lower surface of the upper mold of the fixture.

[0013] Preferably, the ends of the first and second grooves are provided with tab adhesive positioning grooves. The tab adhesive positioning grooves are used to accommodate the tab adhesive and to position the tab adhesive. The tab adhesive positioning grooves cover the positive and negative tab adhesives.

[0014] Preferably, the lower mold of the fixture is provided with a first engaging protrusion, and a first engaging groove is provided on one side of the first engaging protrusion. The lower part of the upper mold of the fixture is provided with a second engaging groove that matches the first engaging protrusion, and the second engaging groove and the first engaging protrusion are fitted together. A second engaging protrusion that matches the first engaging groove is provided on one side of the second engaging groove, and the second engaging protrusion is embedded in the first engaging groove. A central engaging groove is also provided on one side of the first engaging groove, and a central engaging protrusion that matches the central engaging groove is also provided on one side of the second engaging protrusion, and the central engaging protrusion is embedded in the central engaging groove.

[0015] Preferably, the second engaging groove, the second engaging protrusion, and the central engaging protrusion are all provided with guiding inclined surfaces, which serve as guides when the upper mold and the lower mold of the fixture are closed.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In use, the present invention is firstly implemented by placing the lower mold of the fixture at the bottom and placing the stacked core in the receiving groove, thereby achieving good positioning and stable placement; secondly, the upper mold of the fixture is placed at the bottom, wherein the negative electrode tab is made of nickel and can be well attracted and fixed by the first magnet; thirdly, the positive electrode tab is made of aluminum and placed in the second groove, and fixed by a sliding block. Specifically, the sliding block slides along the third groove to the second groove, and the end of the sliding block enters the second groove, thereby fixing the positive electrode tab; finally, the lower mold and the upper mold of the fixture are closed together, so that the negative electrode tab and the positive electrode tab are aligned with the ends of the stacked core, so as to facilitate subsequent welding and fixing.

[0018] 2. In this utility model, the negative electrode tab is fixed by magnetic attraction, and the positive electrode tab is fixed by sliding block. There is no need to use double-sided tape to fix the positive electrode tab, which reduces costs, improves operating efficiency, and avoids the adverse effects of double-sided tape residue on welding quality and subsequent battery pack connection. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the negative electrode tab and the positive electrode tab provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a welding fixture for the tabs of a lithium-ion stacked battery provided by this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the upper mold of the fixture provided by this utility model;

[0023] Figure 4 This is an exploded view of the interior of the upper mold of the fixture provided by this utility model;

[0024] Figure 5 This is a schematic diagram of the manual drive of the sliding block provided by this utility model;

[0025] Figure 6 This is a schematic diagram of the fixture provided by this utility model, showing the upper mold facing downwards.

[0026] Figure 7This is a schematic diagram of the structure of the upper mold body of the fixture provided by this utility model;

[0027] Figure 8 This is a structural schematic diagram of the lower mold of the fixture provided by this utility model.

[0028] The diagram includes:

[0029] 1. Lower mold of fixture; 2. Upper mold of fixture; 3. Stacked core; 11. Receiving groove; 4. First groove; 5. Second groove; 6. First magnet; 7. Negative electrode tab; 10. Positive electrode tab; 8. Third groove; 9. Sliding block; 12. Second magnet; 13. Tab glue positioning groove; 14. Positive electrode tab glue; 15. Negative electrode tab glue; 16. Push rod; 17. Handle part; 18. Connecting hole; 19. Bolt; 20. Fourth groove; 21. Third magnet; 31. First engaging protrusion; 32. First engaging groove; 33. Second engaging groove; 34. Second engaging protrusion; 35. Middle engaging groove; 36. Middle engaging protrusion; 37. Guide inclined slope. Detailed Implementation

[0030] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please refer to Figures 1 to 8 This utility model provides a welding fixture for the tabs of lithium-ion stacked batteries.

[0032] like Figure 1 As shown, the negative electrode tab 7 is made of nickel and can be well attracted and fixed by the first magnet 6; the positive electrode tab 10 is made of aluminum and cannot be attracted by the magnet.

[0033] like Figure 2 As shown, the fixture includes a lower fixture mold 1 and an upper fixture mold 2. The lower fixture mold 1 is located at the lower part, and the upper fixture mold 2 is located at the upper part. The two work together to form a welding space for fixing the stacked core 3 and the electrode tab.

[0034] like Figure 8As shown, the lower mold 1 of the fixture is provided with a receiving groove 11 for placing the stacked core 3. The stacked core 3 is placed inside the receiving groove 11 to achieve limiting and fixing. The shape of the receiving groove 11 matches the stacked core 3 to ensure that the stacked core 3 will not shift during the welding process. Since the stacked core 3 is located at the bottom, it does not need to move. Therefore, the stacked core 3 does not need to be fixed, but only needs to be limited to ensure its stability during the welding process.

[0035] like Figure 2 As shown, the upper mold 2 of the fixture is located at the top, and the negative electrode tab 7 and the positive electrode tab 10 are located at the bottom. They need to be positioned and fixed so that they can remain stable during the welding process.

[0036] To achieve this purpose, the upper mold 2 of the fixture is provided with a positioning structure for fixing the negative electrode tab 7 and the positive electrode tab 10, specifically, as follows: Figure 3 As shown, the bottom of the upper mold 2 of the fixture is provided with a first groove 4 and a second groove 5 arranged side by side. The direction of the first groove 4 and the second groove 5 can be defined as the longitudinal direction; the side-by-side direction is set as the transverse direction; the first groove 4 and the second groove 5 are respectively positioned to locate the negative electrode tab 7 and the positive electrode tab 10.

[0037] Since the negative electrode tab 7 is a nickel tab, a first magnet 6 is installed inside the first groove 4, and the negative electrode tab 7 is attracted to the first magnet 6; in this embodiment, the first groove 4 is relatively deep, and the first groove 4 can also limit the negative electrode tab 7.

[0038] Correspondingly, a positive electrode tab 10 is installed inside the second groove 5, and the positive electrode tab 10 is limited by the second groove 5.

[0039] Furthermore, in order to fix the positive electrode tab 10, a third groove 8 is provided on one side of the second groove 5. The third groove 8 is perpendicular to the second groove 5, and the direction of the third groove 8 is the horizontal direction. A sliding block 9 is installed in the third groove 8. The sliding block 9 slides along the third groove 8 towards the second groove 5. The end of the sliding block 9 enters the second groove 5 to fix the positive electrode tab 10, thereby achieving the clamping and fixing of the positive electrode tab 10.

[0040] Furthermore, during welding, the upper mold 2 of the fixture moves from top to bottom and covers the lower mold 1 of the fixture. At this time, the stacked core 3 is limited within the receiving groove 11, while the negative electrode tab 7 and the positive electrode tab 10 are respectively limited by the first groove 4 and the second groove 5 and clamped and fixed by the sliding block 9. The negative electrode tab 7 and the positive electrode tab 10 are respectively aligned with the ends of the stacked core 3. Ultrasonic welding technology is used to precisely weld the connection between the negative electrode tab 7 and the positive electrode tab 10 and the stacked core 3, thereby ensuring that the welding is firm and there is no false welding.

[0041] In the above technical solution, the sliding block 9 is not fixed. Without external force driving the sliding block 9, the sliding block 9 can maintain a stable position, thereby pressing and fixing the positive electrode tab 10 to ensure the reliability of the welding process.

[0042] To further enhance the stability of the sliding block 9, it can be further fixed so that the sliding block 9 will not shift during operation, thereby further improving the fixing effect on the positive electrode tab 10.

[0043] In this embodiment, a second magnet 12 is installed inside the second groove 5. The second magnet 12 is in contact with the positive electrode tab 10. The sliding block 9 is made of magnetic material, such as magnetic metals or alloys of iron, cobalt, and nickel. The second magnet 12 magnetically attracts and fixes one end of the sliding block 9. By setting the second magnet 12, not only is the fixing effect of the sliding block 9 enhanced, but the stability of the positive electrode tab 10 during the welding process is also improved, effectively avoiding the welding offset or insecure pressing caused by the displacement of the sliding block 9.

[0044] Furthermore, in order to fix the other end of the sliding block 9, a similar method can be used. The end of the third groove 8 away from the second groove 5 is provided with a fourth groove 20. The fourth groove 20 is equipped with a third magnet 21. The third magnet 21 plays an adsorption and fixing role for the sliding block 9, magnetically fixing the sliding block 9 to the end of the third groove 8 away from the second groove 5.

[0045] like Figure 5 As shown, the sliding block 9 is L-shaped, as... Figure 3 As shown, one end of the sliding block 9 enters the interior of the second groove 5, contacts the positive electrode tab 10 and presses it firmly, while the other end is limited by the third groove 8.

[0046] In order to manually drive the sliding block 9, a push rod 16 is installed at one end of the sliding block 9, and a handle 17 is installed at the end of the push rod 16. The push rod 16 pushes the sliding block 9 to move laterally inside the third groove 8. The handle 17 is provided to facilitate the operator to apply force to push and hold.

[0047] To automatically drive the sliding block 9, a drive cylinder or electric push rod can be connected to the end of the push rod 16. By setting a drive cylinder or electric push rod, automatic control of the sliding block 9 can be achieved, thereby improving the working efficiency and automation level of the equipment.

[0048] Furthermore, to facilitate the installation of the sliding block 9, a connecting hole 18 is provided on one side of the upper mold 2 of the fixture. The connecting hole 18 is connected to the third groove 8. The push rod 16 passes through the connecting hole 18 and is inserted into the sliding block 9. The push rod 16 and the sliding block 9 are fixedly connected by bolts 19. When disassembly is required, the bolts 19 are loosened, and the push rod 16 can be pulled out from the sliding block 9 and the connecting hole 18, thereby achieving quick disassembly and facilitating the maintenance or replacement of the sliding block 9.

[0049] like Figure 3 As shown, the lower surface of the sliding block 9 is flush with the lower surface of the upper mold 2 of the fixture.

[0050] like Figure 7 As shown, the first groove 4 and the second groove 5 are provided with tab adhesive positioning grooves 13 at their ends. The tab adhesive positioning grooves 13 are used to accommodate the tab adhesive and also to position the tab adhesive. The tab adhesive positioning grooves 13 cover the positive tab adhesive 14 and the negative tab adhesive 15.

[0051] For better mutual locking, such as Figure 8 As shown, the lower mold 1 of the fixture is provided with a first engaging protrusion 31, a first engaging groove 32 is provided on one side of the first engaging protrusion 31, and a central engaging groove 35 is also provided on one side of the lower mold 1 of the fixture; Figure 7 As shown, the lower part of the upper mold 2 of the fixture is provided with a second engaging groove 33 that matches the first engaging protrusion 31, and the second engaging groove 33 and the first engaging protrusion 31 are fitted together; a second engaging protrusion 34 that matches the first engaging groove 32 is provided on one side of the second engaging groove 33, and the second engaging protrusion 34 is embedded in the first engaging groove 32; a central engaging protrusion 36 that matches the central engaging groove 35 is also provided on one side of the second engaging protrusion 34, and the central engaging protrusion 36 is embedded in the central engaging groove 35.

[0052] The engaging groove and engaging protrusion cooperate with each other, so that the lower mold 1 and the upper mold 2 of the fixture can be accurately aligned and tightly fitted when the molds are closed, thereby improving the stability and sealing of the overall structure.

[0053] In addition, in order to guide each other and facilitate insertion; such as Figure 7As shown, the second engaging groove 33, the second engaging protrusion 34, and the central engaging protrusion 36 are all provided with guiding inclined surfaces 37. These guiding inclined surfaces 37 serve as guides when the upper mold 2 and the lower mold 1 of the fixture are closed, ensuring that the engaging components are smoothly aligned and interlocked, thus avoiding difficulties in mold closing or damage to the mold due to misalignment. The design of the guiding inclined surfaces 37 not only improves assembly efficiency but also effectively extends the service life of the mold.

[0054] The process of using the fixture is as follows: First, the lower mold 1 of the fixture is set at the bottom, and the stacked core 3 is placed in the receiving groove 11, thus achieving good positioning and stable placement; the negative electrode tab 7 is placed inside the first groove 4 and is magnetically fixed by the first magnet 6 inside the first groove 4, and the negative electrode tab 7 is limited by the first groove 4; the positive electrode tab 10 is placed inside the second groove 5, and the positive electrode tab 10 is limited by the second groove 5; second, grasp the handle part 17 and push the sliding block 9 to slide inside the third groove 8 through the push rod 16; the sliding block 9 can move closer to the second groove 5 along the third groove 8, and the end of the sliding block 9 enters the second groove 5 to fix the positive electrode tab 10, thereby achieving clamping and fixing of the positive electrode tab 10; then, as Figure 3 As shown, a second magnet 12 is installed inside the second groove 5. The second magnet 12 is located at the lower part of the positive electrode tab 10. The second magnet 12 magnetically fixes one end of the sliding block 9, thereby stably pressing the positive electrode tab 10 and further improving the fixing effect of the positive electrode tab 10. Finally, during welding, the upper mold 2 of the fixture moves from top to bottom, and the lower mold 1 of the fixture and the upper mold 2 of the fixture engage with each other. Specifically, the second engaging groove 33 engages with the first engaging protrusion 31; the second engaging protrusion 34 is embedded in the first engaging groove 32; the middle engaging protrusion 36 is embedded in the middle engaging groove 35; the negative electrode tab 7 and the positive electrode tab 10 are respectively aligned with the ends of the stacked core 3; and ultrasonic welding technology is used to precisely weld the connection parts of the negative electrode tab 7 and the positive electrode tab 10 to the stacked core 3.

[0055] In this embodiment, compared with the traditional technology of fixing the positive electrode tab 10 by sticking double-sided tape, this embodiment uses a sliding block 9 to press and fix it. After the welding is completed, the operator can easily take out the welded core 3 without pulling the electrode tab welding position, thus not affecting the welding effect of the core 3.

[0056] Furthermore, the exposed end of the positive electrode tab 10 will not have any double-sided adhesive residue that would affect the tab contact and PACK soldering.

[0057] Furthermore, employees no longer need to repeatedly apply double-sided tape, improving employee efficiency and increasing product capacity.

[0058] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A welding fixture for electrode tabs of a lithium-ion laminated battery, characterized in that: The fixture includes a lower mold (1) and an upper mold (2). The lower mold (1) has a receiving groove (11) for accommodating the stacked core (3). The upper mold (2) has a first groove (4) and a second groove (5) arranged side by side at its bottom. A first magnet (6) is installed inside the first groove (4), and a negative electrode tab (7) is attracted to the first magnet (6). A positive electrode tab (10) is installed inside the second groove (5). A third groove (8) is provided on one side of the second groove (5). A sliding block (9) is installed inside the third groove (8). The sliding block (9) slides along the third groove (8) toward the second groove (5). The end of the sliding block (9) is inserted into the second groove (5) to fix the positive electrode tab (10). The lower mold (1) and the upper mold (2) cover each other.

2. The lithium-ion laminated battery tab welding fixture according to claim 1, characterized in that: The sliding block (9) is made of magnetic material. The second groove (5) is equipped with a second magnet (12). The second magnet (12) is in contact with the positive electrode tab (10). The second magnet (12) magnetically fixes one end of the sliding block (9).

3. A welding fixture for lithium-ion laminated battery tabs according to claim 2, characterized in that: The third groove (8) is provided with a fourth groove (20) at one end away from the second groove (5). The fourth groove (20) is provided with a third magnet (21). The third magnet (21) plays an adsorption and fixing role on the sliding block (9), and magnetically fixes the sliding block (9) at one end of the third groove (8) away from the second groove (5).

4. The lithium-ion laminated battery tab welding fixture according to claim 1, characterized in that: The sliding block (9) is L-shaped; one end of the sliding block (9) enters the second groove (5) to contact the positive electrode tab (10) and press it to fix it, while the other end is limited by the third groove (8); one end of the sliding block (9) is equipped with a push rod (16), which pushes the sliding block (9) to move laterally inside the third groove (8).

5. A welding fixture for lithium-ion laminated battery tabs according to claim 4, characterized in that: The upper mold (2) of the fixture has a connecting hole (18) on one side. The connecting hole (18) is connected to the third groove (8). The push rod (16) passes through the connecting hole (18) and is inserted into the sliding block (9). The push rod (16) and the sliding block (9) are fixedly connected by bolts (19).

6. A welding fixture for lithium-ion laminated battery tabs according to claim 2, characterized in that: The negative electrode tab (7) is limited by the first groove (4); the positive electrode tab (10) is limited by the second groove (5).

7. A welding fixture for lithium-ion laminated battery tabs according to claim 1, characterized in that: The lower surface of the sliding block (9) is flush with the lower surface of the upper mold (2) of the fixture.

8. A welding fixture for lithium-ion laminated battery tabs according to claim 1, characterized in that: The first groove (4) and the second groove (5) are provided with tab adhesive positioning grooves (13) at their ends. The tab adhesive positioning grooves (13) are used to accommodate the tab adhesive and to position the tab adhesive. The tab adhesive positioning grooves (13) cover the positive tab adhesive (14) and the negative tab adhesive (15).

9. A welding fixture for lithium-ion laminated battery tabs according to claim 1, characterized in that: The lower mold (1) of the fixture is provided with a first engaging protrusion (31), and a first engaging groove (32) is provided on one side of the first engaging protrusion (31). The lower part of the upper mold (2) of the fixture is provided with a second engaging groove (33) that matches the first engaging protrusion (31). The second engaging groove (33) and the first engaging protrusion (31) are fitted together. A second engaging protrusion (34) that matches the first engaging groove (32) is provided on one side of the second engaging groove (33). The second engaging protrusion (34) is embedded in the first engaging groove (32). A middle engaging groove (35) is also provided on one side of the first engaging groove (32). A middle engaging protrusion (36) that matches the middle engaging groove (35) is also provided on one side of the second engaging protrusion (34). The middle engaging protrusion (36) is embedded in the middle engaging groove (35).

10. A welding fixture for lithium-ion laminated battery tabs according to claim 9, characterized in that: The second engaging groove (33), the second engaging protrusion (34) and the middle engaging protrusion (36) are all provided with a guiding inclined surface (37), which is used to guide the upper mold (2) and the lower mold (1) of the fixture when they are closed.

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