Lithium battery welding tool

Abstract

The utility model discloses a lithium battery welding tool, and belongs to the technical field of lithium ion battery manufacturing. The lithium battery welding tool comprises a welding assembly and a pre-shaping assembly, the pre-shaping assembly is arranged close to the welding assembly, the pre-shaping assembly comprises an elastic pressing strip, one end of the elastic pressing strip is connected with a driving part, and the other end of the elastic pressing strip is arranged towards the root of a tab. Before the welding head is used for welding the tabs, the driving part drives the elastic pressing strip to press the roots of the tabs, the tabs are pre-shaped, and the situation that the tabs on the outer layer are stressed and cracked when the welding head presses the tabs for welding is avoided, so that the poor welding condition is improved, the welding reliability and stability are improved, and the lithium battery production yield is increased; the product safety performance is improved and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery manufacturing, and more specifically to a lithium battery welding tool. Background Art

[0002] Lithium battery welding is an indispensable part of the manufacturing and use of lithium batteries. Through welding, the positive and negative electrodes of lithium batteries are connected together to enable them to work normally. Therefore, the welding quality of lithium battery welding equipment is particularly important. Existing lithium battery welding equipment mainly includes spot welding machines, laser welding machines or ultrasonic welding machines. Among them, ultrasonic welding has the advantages of high efficiency and energy saving, so it is widely used in the production of lithium battery tab welding.

[0003] Ultrasonic welding uses ultrasonic vibrations to weld, which can easily cause cracks at the weld mark. In severe cases, it can even cause complete cracking. The aluminum foil and copper foil at the tabs are the only way for the positive and negative poles to conduct electricity during the charging and discharging process of lithium batteries. Once cracking occurs, it will cause abnormal heat generation in the battery and create a safety hazard. In severe cases, if the tab is completely broken, the lithium battery will lose the capacity of the corresponding pole piece, causing the lithium battery to suddenly become low in capacity, which will cause the entire battery module to fail. Therefore, in the production of lithium batteries, it is extremely critical to improve the quality and reliability of welding. Utility Model Content

[0004] The utility model provides a lithium battery welding tool, which adopts a pre-shaping component to pre-shape the pole ear, thereby improving the reliability and stability of welding.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0006] A lithium battery welding tool, comprising:

[0007] A welding assembly, the welding assembly comprising a welding head, the welding head is used for welding the pole lug;

[0008] Also includes,

[0009] A pre-shaping component is arranged close to the welding component, and the pre-shaping component comprises:

[0010] An elastic pressure strip, one end of which is connected to the driving component, and the other end of which is arranged toward the root of the pole lug;

[0011] Furthermore, a buffer component is arranged between the elastic pressure strip and the driving component; one end of the elastic pressure strip is connected to one side of the buffer component, and the other side of the buffer component is connected to the driving component.

[0012] Furthermore, the buffer component includes an elastic buffer, one end of the buffer is connected to the elastic pressure strip, and the other end of the buffer is connected to the driving component.

[0013] Furthermore, the buffer component also includes a guide component, and the guiding direction of the guide component is consistent with the buffer compression direction of the buffer; one end of the guide component is connected to the elastic pressure strip, and the other end is connected to the driving component.

[0014] Furthermore, the guide component includes a moving member and a guide rail; the moving member moves along the guide rail.

[0015] Furthermore, the buffer component is located between an upper connecting member and a lower connecting member, the upper connecting member is connected to the driving component, and the lower connecting member is connected to the elastic pressure strip.

[0016] Furthermore, one end of the movable member extends into the interior of the guide rail and moves along the extension direction of the guide rail, and the other end is connected to the lower connecting member; the guide rail is connected to the upper connecting member.

[0017] Furthermore, the buffer is a spring, the elastic force F of the spring is kx, and the k value range is 0.1-5N / mm.

[0018] Furthermore, the elastic strip is a rubber strip, and one end close to the pole ear is in an arc shape.

[0019] Furthermore, the welding assembly also includes a welding head base and a transducer, the transducer is connected to the welding head, and the welding head base is arranged corresponding to the welding head; when the welding assembly welds the pole ear, the pole ear is located between the welding head base and the welding head.

[0020] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects: when welding the welding assembly, the elastic pressure strip in the pre-shaping assembly is first pressed toward the root of the pole ear to pre-shape the pole ear, thereby avoiding the outer pole ear from being stressed and cracked when the welding head presses the pole ear for welding, thereby improving the welding defects, improving the welding reliability and stability, improving the yield rate of lithium battery production, improving the product safety performance, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of lithium battery welding tooling;

[0022] Figure 2 This is a schematic diagram of existing lithium battery welding tooling.

[0023] Description of labels:

[0024] 11. Elastic pressure strip; 12. Guide component; 121. Moving component; 122. Guide rail; 13. Buffer; 14. Driving component; 15. Upper connecting part; 16. Lower connecting part; 2. Welding head base; 3. Welding head; 4. Transducer; 5. Battery cell; 6. Tab. DETAILED DESCRIPTION

[0025] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0026] like Figure 1 As shown, this embodiment provides a lithium battery welding tool, including a welding component and a pre-shaping component.

[0027] like Figure 2 As shown, the welding assembly is a prior art, using an ultrasonic welding assembly. Specifically, the welding assembly includes a welding head 3, a welding head base 2 and a transducer 4, the transducer 4 is connected to the welding head 3, and the welding head base 2 is correspondingly arranged with the welding head 3. When the welding assembly welds the pole ear 6, the pole ear 6 is located between the welding head base 2 and the welding head 3, so that the pole ear 6 is welded. The pole ear 6 is located on the battery cell 5 and is formed by the battery cell 5.

[0028] See Figure 1 , the pre-shaping component is arranged close to the welding component, and the pre-shaping component includes an elastic pressure strip 11. One end of the elastic pressure strip 11 is connected to the driving component 14, and the other end is arranged toward the root of the pole ear 6. Before the welding head 3 welds the pole ear 6, the driving component 14 drives the elastic pressure strip 11 to press against the root of the pole ear 6 to pre-shape the pole ear 6. The root of the pole ear 6 is the end close to the connection between the pole ear 6 and the battery cell 5. The elastic pressure strip 11 is a rubber pressure strip, which is made of elastic rubber material, such as silicone rubber, fluororubber, ethylene propylene rubber, nitrile rubber, etc. The elastic pressure strip 11 presses against the pole ear 6 to pre-shape it, making the pole ear more flat, and avoiding the situation that the outer layer of the pole ear is easy to crack when the welding head 3 welds the pole ear and presses it. The elastic pressure strip 11 adopts a rubber pressure strip, and the end close to the pole ear 6 is in an arc shape, so that the elastic pressure strip 11 is pressed against the root of the pole ear 6, and when it contacts the pole ear 6, it effectively avoids the pole ear 6 from being crushed.

[0029] The driving component 14 is driven by a cylinder to drive the elastic pressure strip 11 to move. In other cases, the driving component 14 can also be a driving motor or the like.

[0030] In this embodiment, a buffer component is provided between the elastic pressure strip 11 and the driving component 14. One end of the elastic pressure strip 11 is connected to one side of the buffer component, and the other side of the buffer component is connected to the driving component 14. More specifically, the buffer component is located between the upper connecting member 15 and the lower connecting member 16, the upper side of the buffer component is connected to the driving component 14 through the upper connecting member 15, and the lower side of the buffer component is connected to the elastic pressure strip 11 through the lower connecting member 16. The buffer component includes an elastic buffer 13, one end of the buffer 13 is connected to the elastic pressure strip 11 through the lower connecting member 16, and the other end is connected to the driving component 14 through the upper connecting member 15.

[0031] In this embodiment, the buffer 13 is a spring, the elastic force F of the spring is kx, and the k value range is 0.3-0.5 N / mm. In other embodiments, the k value range can also be other values, and the range is 0.1-5 N / mm.

[0032] The buffer component also includes a guide component 12, and the guide direction of the guide component 12 is consistent with the buffer compression direction of the buffer 13. One end of the guide component 12 is also connected to the elastic pressure strip 11 through the lower connecting member 16, and the other end is connected to the driving component 14 through the upper connecting member 15.

[0033] The guide member 12 includes a moving member 121 and a guide rail 122. The guide rail 122 is hollow inside, and one end of the moving member 121 extends into the guide rail 122. When the buffer 13 is compressed or the elastic force is restored, the moving member 121 moves along the extension direction of the guide rail 122. The other end of the moving member 121 is fixedly connected to the lower connecting member 16, and the guide rail 122 is connected to the upper connecting member 15.

[0034] When the driving component 14 drives the elastic pressure strip 11 to press against the pole ear 6, it can buffer the force of the elastic pressure strip 11 pressing against the pole ear 6, thereby minimizing the damage of the pressing process to the pole ear 6. The guide component 12 guides the buffering direction of the buffer component so that the buffering direction is consistent with the moving direction of the elastic pressure strip 11, thereby preventing the elastic pressure strip 11 from being skewed.

[0035] In addition, the elastic pressure strip 11 and the buffer 13 made of rubber material can absorb the welding vibration energy during ultrasonic welding to prevent the upper tab from cracking due to vibration. The welding structure of this embodiment can improve the welding defects, improve the welding reliability and stability, improve the yield rate of lithium battery production, improve the product safety performance, and reduce the production cost.

[0036] When welding the pole lugs in the welding structure of this embodiment, the pole lug 6 is first placed between the welding head base 2 and the welding head 3, and then the driving component 14 is started to make the elastic pressure strip 11 press the root of the pole lug 6, and then the welding head 3 is put down and the transducer 4 is started to complete the welding. In one case, 1000 pole lugs 6 are welded, and the welding defect rate is 0.00%. Figure 2 In the structure, only welding components are provided, and no pre-shaped components are provided. Figure 2 In the experiment, 1000 pieces of electrode tabs 6 were welded, and the welding failure rate reached 2.10%. It can be seen that the welding structure in this embodiment effectively improves the welding failure situation.

[0037] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A lithium battery welding tool, comprising: A welding assembly, the welding assembly comprising a welding head (3), the welding head (3) being used for welding a pole lug (6); Features: Also includes, A pre-shaping component is arranged close to the welding component, and the pre-shaping component comprises: An elastic pressure strip (11), wherein one end of the elastic pressure strip (11) is connected to the driving component (14), and the other end is arranged toward the root of the pole lug (6).

2. The lithium battery welding tool according to claim 1, characterized in that: A buffer component is provided between the elastic pressure strip (11) and the driving component (14); one end of the elastic pressure strip (11) is connected to one side of the buffer component, and the other side of the buffer component is connected to the driving component (14).

3. The lithium battery welding tool according to claim 2, characterized in that: The buffer component comprises an elastic buffer (13), one end of the buffer (13) is connected to the elastic pressure strip (11), and the other end is connected to the driving component (14).

4. The lithium battery welding tool according to claim 3, characterized in that: The buffer component further comprises a guide component (12), wherein the guide direction of the guide component (12) is consistent with the buffer compression direction of the buffer (13); one end of the guide component (12) is connected to the elastic pressure strip (11), and the other end is connected to the driving component (14).

5. The lithium battery welding tool according to claim 4, characterized in that: The guide component (12) comprises a moving member (121) and a guide rail (122); the moving member (121) moves along the guide rail (122).

6. The lithium battery welding tool according to claim 5, characterized in that: The buffer component is located between an upper connecting member (15) and a lower connecting member (16); the upper connecting member (15) is connected to the driving member (14); and the lower connecting member (16) is connected to the elastic pressure strip (11).

7. The lithium battery welding tool according to claim 6, characterized in that: One end of the movable member (121) extends into the interior of the guide rail (122) and moves along the extension direction of the guide rail (122), and the other end is connected to the lower connecting member (16); the guide rail (122) is connected to the upper connecting member (15).

8. The lithium battery welding tool according to claim 3, characterized in that: The buffer (13) is a spring, the elastic force F of the spring is equal to kx, and the k value range is 0.1-5 N / mm.

9. The lithium battery welding tool according to claim 1, characterized in that: The elastic strip (11) is a rubber strip, and one end close to the pole ear (6) is in an arc shape.

10. The lithium battery welding tool according to claim 1, characterized in that: The welding assembly further comprises a welding head base (2) and a transducer (4), wherein the transducer (4) is connected to the welding head (3), and the welding head base (2) and the welding head (3) are arranged correspondingly; when the welding assembly welds the pole ear (6), the pole ear (6) is located between the welding head base (2) and the welding head (3).

Images