Ultrasonic welding mechanism, lithium battery cell and lithium battery cell group

Abstract

The utility model provides an ultrasonic welding mechanism which comprises an ultrasonic welding device, a machine base and a welding base device. The ultrasonic welding device comprises a rack, a driving assembly used for providing ultrasound and an ultrasonic welding head used for transmitting ultrasonic energy, the driving assembly is arranged in the rack, and the ultrasonic welding head is adjustably arranged on the rack and connected with the output end of the driving assembly; the welding seat device comprises a mounting assembly and a welding seat used for being matched with the ultrasonic welding head, the welding seat is detachably connected with the mounting assembly and located below the ultrasonic welding head, and the mounting assembly is adjustably arranged on the machine base; and the welding seat and the ultrasonic welding head are conductors and are provided with insulating layers. The ultrasonic welding mechanism is high in universality and practicability, the position can be conveniently adjusted to achieve stable welding of the tabs of the lithium battery cells and the connecting pieces / tabs, and the problem that short circuits are prone to occurring can be solved. The utility model also provides a lithium battery cell and a lithium battery cell group.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and more specifically, to an ultrasonic welding mechanism, a lithium battery cell, and a lithium battery cell assembly. Background Technology

[0002] With rapid societal development and the widespread use of mobile devices, there is a significant demand for high-energy batteries. Lithium-ion batteries, due to their high energy density, small size, and environmental friendliness, have gained considerable attention. However, the assembly of lithium-ion battery cells remains a challenging aspect of the battery manufacturing process.

[0003] Ultrasonic welding utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the surfaces rub against each other, causing fusion between molecular layers. Currently, ultrasonic welding is widely used in lithium-ion batteries, specifically for welding the tabs and connecting pieces of lithium-ion battery cells. However, existing ultrasonic welding equipment suffers from limitations in adjusting the height of the welding head and the position of the welding base, resulting in low versatility and practicality. Furthermore, since both the welding head and welding base are conductors, using existing ultrasonic welding equipment can easily cause the lithium-ion battery cell tabs to come into contact with the welding head and base, leading to short circuits and cell failure, resulting in a high rate of scrapped lithium-ion battery cells. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of existing technologies and provide an ultrasonic welding mechanism, a lithium battery cell, and a lithium battery cell assembly. This ultrasonic welding mechanism is highly versatile and practical, not only allowing for convenient position adjustment to achieve stable welding of the lithium battery cell's tabs and connecting pieces / tabs, but also solving the problem of easy short circuits. This invention also provides a lithium battery cell whose tabs and connecting pieces are welded to each other using an ultrasonic welding mechanism, resulting in stable connections. Furthermore, this invention provides a lithium battery cell assembly with high stability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an ultrasonic welding mechanism, characterized in that it includes an ultrasonic welding device, a base, and a welding base device; the ultrasonic welding device includes a frame, a drive assembly for providing ultrasound, and an ultrasonic welding head for transmitting ultrasonic energy; the drive assembly is disposed within the frame, and the ultrasonic welding head is adjustablely disposed on the frame and connected to the output end of the drive assembly; the welding base device includes a mounting assembly and a welding base for cooperating with the ultrasonic welding head; the welding base is detachably connected to the mounting assembly and located below the ultrasonic welding head; the mounting assembly is adjustablely disposed on the base; both the welding base and the ultrasonic welding head are conductors and are provided with an insulating layer.

[0006] In the above-described solution, the ultrasonic welding device of this invention uses existing technology for its driving component for providing ultrasonic waves and its ultrasonic welding head for transmitting ultrasonic energy. This invention allows for adjustment of the positions of the ultrasonic welding head and the welding base according to actual processing needs, achieving stable welding of the lithium battery cell's tabs to the connecting pieces / tabs on the ultrasonic welding head and welding base. Furthermore, both the welding base and the ultrasonic welding head are equipped with insulating layers, thus preventing short circuits caused by contact between the lithium battery cell's tabs and the ultrasonic welding head and welding base during welding, thereby significantly reducing the battery cell scrap rate.

[0007] The insulating layer surrounds the side of the welding base, with the end face of the welding base facing the ultrasonic welding head protruding outwards; the insulating layer also surrounds the side of the ultrasonic welding head, with the end of the ultrasonic welding head facing the welding base protruding outwards. This invention covers the portion of the ultrasonic welding head and welding base outside the welding surface with an insulating layer.

[0008] The welding base has several concave points on its end face facing the ultrasonic welding head; the ultrasonic welding head has several convex points on its end face facing the welding base that match the concave points. This concave-convex point design makes the welding stronger and further improves the stability of the welding process.

[0009] The surface of the mounting component is also provided with an insulating layer.

[0010] The detachable connection between the welding socket and the mounting assembly means that the mounting assembly includes a base, a base plate, and fasteners. The base has a mounting groove and connects to the base plate. The welding socket is inserted into the mounting groove and fixed to the base by the fasteners, achieving a detachable connection. The welding socket inserted into the mounting groove protrudes from the base. This design facilitates the replacement of the welding socket. When the welding socket is worn or needs to be replaced according to processing requirements, simply loosen the fasteners to push out the welding socket, then insert a new welding socket and fix it with the fasteners, thus achieving convenient replacement of the welding socket.

[0011] The adjustable mounting assembly on the machine base means that the mounting assembly also includes an adjusting fastener; the base plate has an adjusting groove, and after the base plate moves to an adjustable position on the machine base, it is locked by the adjusting fastener, thus enabling the mounting assembly to be adjustable on the machine base. The welding socket of this invention can be adjusted in position on the machine base via the base plate.

[0012] The adjustable mounting of the ultrasonic welding head on the frame means that the ultrasonic welding device also includes a mounting base and an adjusting fastener, with the ultrasonic welding head mounted on the mounting base. The mounting base has an adjusting groove; after the mounting base is moved and adjusted in height on the frame, it is locked by the adjusting fastener, thus achieving adjustable mounting of the ultrasonic welding head on the frame. The ultrasonic welding head of this invention can be height-adjusted by adjusting the mounting base on the frame.

[0013] A lithium battery cell includes a cell body, a positive electrode tab, a negative electrode tab, and a conductive connecting piece; the positive electrode tab and the negative electrode tab are connected to the cell body; wherein the positive electrode tab is an aluminum sheet and the negative electrode tab is a nickel sheet; the negative electrode tab and the conductive connecting piece are welded by the aforementioned ultrasonic welding mechanism.

[0014] The conductive connecting piece is an aluminum connecting piece; the battery cell is soldered to the external circuit board through a positive electrode tab and a conductive connecting piece connected to a negative electrode tab.

[0015] The welding of nickel sheets requires ultrasonic welding technology. Therefore, after the nickel sheet negative electrode tab and conductive connecting piece of this utility model are stably welded by the ultrasonic welding mechanism, it is convenient for subsequent lithium battery cell processing. The subsequent lithium battery cells can be processed by ordinary welding processes. For example, lithium battery cells with conductive connecting pieces welded to the negative electrode tab can be welded to the external circuit board by ordinary welding processes.

[0016] A lithium battery cell assembly includes at least two lithium battery cells, each lithium battery cell including a cell body, a positive electrode tab and a negative electrode tab, and a conductive connecting piece; the positive electrode tab and the negative electrode tab are connected to the cell body, the positive electrode tab is an aluminum sheet, and the negative electrode tab is a nickel sheet; in two adjacent lithium battery cells, the positive electrode tab of one lithium battery cell and the negative electrode tab of another lithium battery cell are welded together by the aforementioned ultrasonic welding mechanism, and the negative electrode tab of the last lithium battery cell is welded to the conductive connecting piece by the aforementioned ultrasonic welding mechanism; at least two lithium battery cells are connected in series to form a lithium battery cell assembly.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. The ultrasonic welding mechanism of this utility model has strong versatility and practicality. It can not only conveniently adjust the position to achieve stable welding of the electrode tab of the lithium battery cell to the connecting piece / tab, but also solve the problem of easy short circuit.

[0019] 2. The electrode tabs and connecting pieces of the lithium battery cell of this utility model are welded by an ultrasonic welding mechanism, which has connection stability. The lithium battery cell with conductive connecting pieces welded by ultrasonic welding can improve the convenience of subsequent processing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the ultrasonic welding mechanism of this utility model;

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the end of the ultrasonic welding head facing the welding seat in the ultrasonic welding mechanism of this utility model;

[0023] Figure 4This is a schematic diagram of the lithium battery cell in Example 2;

[0024] Figure 5 This is a schematic diagram of the lithium battery cell pack in Example 3;

[0025] Among them, 1 is the base, 2 is the frame, 3 is the ultrasonic welding head, 4 is the welding seat, 5 is the insulating layer, 6 is the concave point, 7 is the convex point, 8 is the base, 8.1 is the mounting groove, 9 is the base plate, 10 is the fastener, 11 is the first adjusting fastener, 12 is the first adjusting groove, 13 is the mounting seat, 14 is the second adjusting fastener, 15 is the second adjusting groove, 16 is the battery cell, 17 is the positive electrode tab, 18 is the negative electrode tab, 19 is the conductive connecting piece, and 20 is the external circuit board. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] like Figures 1 to 3 As shown, the ultrasonic welding mechanism of this utility model includes an ultrasonic welding device, a base 1, and a welding base device. The ultrasonic welding device includes a frame 2, a drive assembly for providing ultrasonic waves, and an ultrasonic welding head 3 for transmitting ultrasonic energy. The drive assembly is disposed within the frame 2, and the ultrasonic welding head 3 is adjustablely mounted on the frame 2 and connected to the output end of the drive assembly. The welding base device includes a mounting assembly and a welding base 4 for cooperating with the ultrasonic welding head 3. The welding base 4 is detachably connected to the mounting assembly and located below the ultrasonic welding head 3. The mounting assembly is adjustablely mounted on the base 1.

[0029] In this invention, both the welding base 4 and the ultrasonic welding head 3 are conductors. To prevent short circuits caused by contact between the lithium battery cell's electrode tabs and the ultrasonic welding head 3 and welding base 4, an insulating layer 5 is provided on the surfaces of the welding base 4, the ultrasonic welding head 3, and the mounting assembly. Specifically, the insulating layer 5 surrounds the side of the welding base 4, with the end face of the welding base 4 facing the ultrasonic welding head 3 protruding outwards; the insulating layer 5 also surrounds the side of the ultrasonic welding head 3, with the end face of the ultrasonic welding head 3 facing the welding base 4 protruding outwards. This invention covers the portions of the ultrasonic welding head 3 and the welding base 4 other than their welding surfaces with the insulating layer 5.

[0030] To make the welding more robust, the end face of the welding seat 4 facing the ultrasonic welding head 3 is provided with several concave points 6, and the end face of the ultrasonic welding head 3 facing the welding seat 4 is provided with several protrusions 7 that match the concave points 6, which can improve the stability of the welding.

[0031] The detachable connection between the welding socket 4 and the mounting assembly in this utility model refers to the following: the mounting assembly includes a base 8, a base plate 9, and fasteners 10. The base 8 has a mounting groove 8.1 and is connected to the base plate 9. The welding socket 4 is inserted into the mounting groove 8.1 and fixed by the fasteners 10 to achieve a detachable connection with the base 8. The welding socket 4 inserted into the mounting groove 8.1 protrudes from the base 8. This design facilitates the replacement of the welding socket 4. When the welding socket 4 is worn or needs to be replaced according to processing requirements, the fasteners 10 can be loosened to push out the welding socket 4, and then a new welding socket 4 can be inserted and fixed by the fasteners 10, thus achieving convenient replacement of the welding socket 4.

[0032] Furthermore, the adjustable mounting component on the base 1 means that the mounting component also includes an adjusting fastener 11, and the base plate 9 has an adjusting groove 12. After the base plate 9 moves to an adjustable position on the base 1, it is locked by the adjusting fastener 11, thus achieving the adjustable mounting component on the base 1. The welding socket 4 of this utility model can be adjusted in position on the base 1 via the base plate 9.

[0033] The adjustable mounting of the ultrasonic welding head 3 on the frame 2 in this invention refers to the following: the ultrasonic welding device also includes a mounting base 13 and an adjusting fastener 14. The ultrasonic welding head 3 is mounted on the mounting base 13, which has an adjusting groove 15. After the mounting base 13 is moved and adjusted in height on the frame 2, it is locked by the adjusting fastener 14, thus achieving adjustable mounting of the ultrasonic welding head 3 on the frame 2. The ultrasonic welding head 3 of this invention can be adjusted in height on the frame 2 via the mounting base 13.

[0034] The ultrasonic welding device of this invention uses existing technology for its ultrasonic drive component and ultrasonic welding head for transmitting ultrasonic energy. This invention allows for adjustment of the positions of the ultrasonic welding head 3 and the welding base 4 according to actual processing needs, enabling stable welding of the lithium battery cell's tabs to the connecting pieces / tabs on the ultrasonic welding head 3 and welding base 4. Furthermore, both the welding base 4 and the ultrasonic welding head 3 are equipped with an insulating layer 5, preventing short circuits caused by contact between the lithium battery cell's tabs and the ultrasonic welding head 3 and welding base 4 during welding, thereby significantly reducing the battery cell scrap rate.

[0035] Example 2

[0036] like Figure 4 As shown, this embodiment of a lithium battery cell includes a cell body 16, a positive electrode tab 17, a negative electrode tab 18, and a conductive connecting piece 19 made of aluminum. The positive electrode tab 17 and the negative electrode tab 18 are connected to the cell body 16. The positive electrode tab 17 is an aluminum sheet, and the negative electrode tab 18 is a nickel sheet. The negative electrode tab 18 and the conductive connecting piece 19 are welded using the ultrasonic welding mechanism described in Embodiment 1. In this embodiment, the cell body 16 is welded to an external circuit board 20 via the positive electrode tab 17 and the conductive connecting piece 19 connected to the negative electrode tab 18.

[0037] The welding of nickel sheets requires ultrasonic welding technology. Therefore, after the nickel sheet negative electrode tab 18 and conductive connecting piece 19 of this utility model are stably welded by the ultrasonic welding mechanism, it is convenient for subsequent lithium battery cell processing. The subsequent lithium battery cell can be processed by ordinary welding process. For example, the lithium battery cell with the negative electrode tab 18 welded with the conductive connecting piece 19 can be welded to the external circuit board 20 by ordinary welding process.

[0038] Example 3

[0039] like Figure 5 As shown, the lithium battery cell assembly of this embodiment includes at least two lithium battery cells. Each lithium battery cell includes a cell body 16, a positive electrode tab 17, a negative electrode tab 18, and a conductive connecting piece 19. The positive electrode tab 17 and the negative electrode tab 18 are connected to the cell body 16. The positive electrode tab 17 is an aluminum sheet, and the negative electrode tab 18 is a nickel sheet. In two adjacent lithium battery cells, the positive electrode tab 17 of one lithium battery cell and the negative electrode tab 18 of another lithium battery cell are welded together using the ultrasonic welding mechanism of Embodiment 1. The negative electrode tab 18 of the last lithium battery cell is welded to the conductive connecting piece 19 using the ultrasonic welding mechanism of Embodiment 1. At least two lithium battery cells are connected in series to form a lithium battery cell assembly.

[0040] The welding of nickel sheets requires ultrasonic welding technology. Therefore, in this embodiment, the nickel sheet negative electrode tab 18 is welded to the positive electrode tab 17 of another lithium battery cell through an ultrasonic welding mechanism. After the nickel sheet negative electrode tab 18 of the last lithium battery cell is stably welded to the conductive connecting piece 19 through the ultrasonic welding mechanism, it is convenient for subsequent processing and use of lithium battery cell groups. Subsequent lithium battery cell groups can be processed through ordinary welding processes.

[0041] 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. An ultrasonic welding mechanism characterized by: The application relates to an ultrasonic welding device, a machine base and a welding seat device; the ultrasonic welding device comprises a rack, a driving assembly for providing ultrasonic waves and an ultrasonic welding head for transmitting ultrasonic energy; the driving assembly is arranged in the rack, the ultrasonic welding head is adjustably arranged on the rack and is connected with the output end of the driving assembly; the welding seat device comprises a mounting assembly and a welding seat for matching the ultrasonic welding head; the welding seat is detachably connected with the mounting assembly and is located below the ultrasonic welding head; the mounting assembly is adjustably arranged on the machine base; the welding seat and the ultrasonic welding head are both conductors and are provided with insulating layers.

2. The ultrasonic welding mechanism of claim 1, wherein: The insulating layer surrounds the side of the welding seat, and the end surface of the welding seat towards the ultrasonic welding head is exposed; the insulating layer surrounds the side of the ultrasonic welding head, and the end of the ultrasonic welding head towards the welding seat is exposed.

3. The ultrasonic welding mechanism of claim 2, wherein: The end surface of the welding seat towards the ultrasonic welding head is provided with a plurality of concave points; the end of the ultrasonic welding head towards the welding seat is provided with a plurality of convex points matched with the concave points.

4. The ultrasonic welding mechanism of claim 1, wherein: The surface of the mounting assembly is also provided with an insulating layer.

5. The ultrasonic welding mechanism of claim 1, wherein: The detachable connection between the welding seat and the mounting assembly refers to that the mounting assembly comprises a base, a bottom plate and fasteners; the base is provided with a mounting groove and is connected with the bottom plate; the welding seat is inserted on the mounting groove and is fixed by the fasteners to realize the detachable connection with the base; the welding seat inserted on the mounting groove protrudes from the base.

6. The ultrasonic welding mechanism of claim 5, wherein: The adjustably arranged mounting assembly on the machine base refers to that the mounting assembly further comprises an adjusting fastener I; the bottom plate is provided with an adjusting groove I; after the bottom plate is moved to adjust the position on the machine base, the bottom plate is locked by the adjusting fastener I to realize the adjustably arranged mounting assembly on the machine base.

7. The ultrasonic welding mechanism of claim 1, wherein: The adjustably arranged ultrasonic welding head on the rack refers to that the ultrasonic welding device further comprises a mounting seat and an adjusting fastener II; the ultrasonic welding head is arranged on the mounting seat; the mounting seat is provided with an adjusting groove II; after the mounting seat is moved to adjust the height on the rack, the mounting seat is locked by the adjusting fastener II to realize the adjustably arranged ultrasonic welding head on the rack.

8. A lithium battery cell characterized by: The application relates to an ultrasonic welding device, a machine base and a welding seat device; the ultrasonic welding device comprises a rack, a driving assembly for providing ultrasonic waves and an ultrasonic welding head for transmitting ultrasonic energy; the driving assembly is arranged in the rack, the ultrasonic welding head is adjustably arranged on the rack and is connected with the output end of the driving assembly; the welding seat device comprises a mounting assembly and a welding seat for matching the ultrasonic welding head; the welding seat is detachably connected with the mounting assembly and is located below the ultrasonic welding head; the mounting assembly is adjustably arranged on the machine base; the welding seat and the ultrasonic welding head are both conductors and are provided with insulating layers.

9. The lithium battery cell of claim 8, wherein: The conductive connecting piece is an aluminum connecting piece; the electric core body is welded with an external circuit board through the positive pole ear and the conductive connecting piece connected with the negative pole ear.

10. A lithium battery cell pack, characterized by: The application relates to an ultrasonic welding device, a machine base and a welding seat device; the ultrasonic welding device comprises a rack, a driving assembly for providing ultrasonic waves and an ultrasonic welding head for transmitting ultrasonic energy; the driving assembly is arranged in the rack, the ultrasonic welding head is adjustably arranged on the rack and is connected with the output end of the driving assembly; the welding seat device comprises a mounting assembly and a welding seat for matching the ultrasonic welding head; the welding seat is detachably connected with the mounting assembly and is located below the ultrasonic welding head; the mounting assembly is adjustably arranged on the machine base; the welding seat and the ultrasonic welding head are both conductors and are provided with insulating layers. The conductive connecting piece is an aluminum connecting piece; the electric core body is welded with an external circuit board through the positive pole ear and the conductive connecting piece connected with the negative pole ear. The application relates to an ultrasonic welding device, a machine base and a welding seat device; the ultrasonic welding device comprises a rack, a driving assembly for providing ultrasonic waves and an ultrasonic welding head for transmitting ultrasonic energy; the driving assembly is arranged in the rack, the ultrasonic welding head is adjustably arranged on the rack and is connected with the output end of the driving assembly; the welding seat device comprises a mounting assembly and a welding seat for matching the ultrasonic welding head; the welding seat is detachably connected with the mounting assembly and is located below the ultrasonic welding head; the mounting assembly is adjustably arranged on the machine base; the welding seat and the ultrasonic welding head are both conductors and are provided with insulating layers.

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