Novel ultrasonic welding structure and welding machine

Abstract

The utility model provides a novel ultrasonic welding structure which comprises a welding head and a base. The welding head is arranged above the base, welding teeth are arranged at the end, close to the base, of the welding head, and printing is arranged at the end, close to the welding head, of the base. Wherein the plurality of welding teeth are arranged in a dot matrix manner and are used for downwards welding a plurality of layers of tab battery cells; and a plurality of prints are arranged in a matrix manner and are used for upwards supporting the multi-layer tab battery cell. The utility model further provides a welding machine which comprises the novel ultrasonic welding structure. According to the utility model, a plurality of welding teeth are arranged on the welding head in a dot matrix manner, so that the tabs are uniformly stressed, the tabs are not rebounded and torn, and the bending is not influenced; meanwhile, the base is provided with a plurality of patterns arranged in a matrix, so that the friction force when the base is in contact with the tabs is further increased, and the welding effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and manufacturing, and in particular to a novel ultrasonic welding structure and a welding machine suitable for welding multi-layer tab battery cores. Background Art

[0002] In the production process of multi-layer tab batteries, an ultrasonic welding machine is required to pre-weld and close the multi-layer tabs so that the tabs are brought together from different positions and at different angles to the same area. However, since the traditional welding method is one welding point, or two welding points in the same longitudinal position, the following defects will occur after welding: (1) Only the top welding area of ​​the tab can be fixed. After the pre-welding is completed, due to the loosening of the tab shaping mechanism, the tab will rebound in a certain shape, showing a state where the root is relatively loose and the weld mark position is closed. The state of the tab at this time is inconsistent with the state during welding. The outermost layer of the tab will be stressed. In the subsequent ultrasonic final welding process, the tab will be torn due to the loose root of the tab: (2) After welding, the tab cannot be bent at any angle. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a novel ultrasonic welding structure and a welding machine to avoid the problems of loose, tearing and inability to bend the tabs arbitrarily after pre-welding caused by the traditional ultrasonic welding method.

[0004] The utility model adopts the following technical solutions to solve the above technical problems:

[0005] A novel ultrasonic welding structure comprises a welding head and a base; the welding head is arranged above the base, a welding tooth is provided on one end of the welding head close to the base, and a printing is provided on one end of the base close to the welding head; wherein, a plurality of welding teeth are provided, and the plurality of welding teeth are arranged in a dot matrix, so as to weld multi-layer tab battery cells downward; a plurality of printings are also provided, and the plurality of printings are arranged in a matrix, so as to support multi-layer tab battery cells upward.

[0006] As one of the preferred embodiments of the present invention, the welding teeth are externally protruding teeth fixed to the welding head, and the cross-section of each welding tooth is a conical shape that is narrow at the top and wide at the bottom.

[0007] As one of the preferred embodiments of the present invention, the top surface of the welding tooth is an arc-shaped structure.

[0008] As one of the preferred embodiments of the present invention, the height of the welding teeth is greater than 3 mm, and the diameter of the welding teeth is adjusted according to the number of tab layers. The more tab layers there are, the larger the welding teeth are. The maximum diameter of the welding teeth does not exceed 2 mm, and the spacing between adjacent welding teeth is 5 to 10 mm.

[0009] As one of the preferred embodiments of the present invention, the print is an outward convex print fixed on the base, and the print shape is a rectangle.

[0010] As one of the preferred embodiments of the present invention, the size and depth of the print are adjusted according to the number of tab layers. The more tab layers there are, the larger the print unit is and the deeper the depth is. The side length and depth of each print do not exceed 2 mm.

[0011] As one of the preferred embodiments of the present invention, the welding position of each welding tooth on the welding head can correspond to at least one printed position on the base.

[0012] As one of the preferred embodiments of the present invention, when the multi-layer tab battery cell is placed on the base, the multi-layer tab battery cell is welded by operating a welding head located above the base and the multi-layer tab battery cell.

[0013] A welding machine comprises the novel ultrasonic welding structure.

[0014] As one of the preferred embodiments of the present invention, the welding machine further comprises a welding host connected to the welding head.

[0015] Working principle:

[0016] Place the multi-layer tab battery cell to be welded between the welding head and the base, press the welding teeth of the welding head downward, and cooperate with the printing on the base to achieve the effect of compacting the welding assembly. Finally, the welding host transmits ultrasonic waves to the multi-layer tab battery cell through the welding head to achieve pre-welding.

[0017] The advantages of the utility model compared with the prior art are:

[0018] (1) The utility model provides a plurality of welding teeth arranged in a dot matrix on the welding head, which can effectively and reasonably increase the force points and force areas of the tabs, so that the tabs are evenly stressed, and all tabs are welded together into a stable whole without tab rebound and tearing (the tearing caused by the whole piece of welding mark is reduced to "0"); at the same time, it does not affect the bending of the tabs, and the tabs can be folded at any angle;

[0019] (2) The utility model also provides a plurality of prints arranged in a matrix on the base. The arrangement of the prints can further increase the friction when in contact with the pole ear, making the ultrasonic welding operation more stable; at the same time, the welding position of each welding tooth on the welding head corresponds to the position of the print on the base, so that the falling position of the top of the welding tooth can just fall on one of the corresponding positions of the print on the base, so that the supporting force of each welding tooth during the welding operation is sufficient and stable, effectively improving the welding effect;

[0020] (3) In order to make the welding effect of products with different thicknesses consistent, the utility model further optimizes the structural parameters according to the requirements of the products to be welded, that is, the height of the welding tooth is greater than 3mm, the diameter of the welding tooth is adjusted according to the number of tab layers, the more tab layers, the larger the welding tooth, the maximum diameter of the welding tooth does not exceed 2mm, the spacing between adjacent welding teeth is 5-10mm, the size and depth of the printing are adjusted according to the number of tab layers, the more tab layers, the larger the printing unit, the deeper the depth, the side length and depth of each printing does not exceed 2mm, so as to make the welding effect of products with different thicknesses consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the novel ultrasonic welding structure in Example 1;

[0022] Figure 2 is a schematic diagram of the base structure in Example 1;

[0023] Figure 3 is a schematic diagram of the welding tooth structure in Example 1;

[0024] Figure 4 It is a schematic diagram of the structure of the multi-layer tab battery cell after welding in Example 1;

[0025] Figure 5 is a schematic diagram of the structure of the multi-layer tab battery cell after being bent at a first angle in Example 1;

[0026] Figure 6 is a schematic diagram of the structure of the multi-layer tab battery cell after being bent at a second angle in Example 1;

[0027] Figure 7 It is a schematic diagram of the structure of the multi-layer tab battery cell after being bent at a third angle in Example 1.

[0028] In the figure: 1 is a welding head, 11 is a welding tooth, 2 is a base, 21 is a print, 3 is a multi-layer tab battery cell, and 31 is a welding point. DETAILED DESCRIPTION

[0029] The following is a detailed description of an embodiment of the utility model. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0030] Example 1

[0031] Reference Figures 1 to 4A new type of ultrasonic welding structure of the present embodiment is used for welding a square multi-layer tab battery cell 3, and includes a welding head 1 and a base 2; the welding head 1 is arranged above the base 2, and a welding tooth 11 is provided on the end of the welding head 1 close to the base 2, and a printing 21 is provided on the end of the base 2 close to the welding head 1; wherein, a plurality of welding teeth 11 are provided, and the plurality of welding teeth 11 are arranged in a dot matrix, and are used for welding the multi-layer tab battery cell 3 downward; a plurality of printings 21 are also provided, and the plurality of printings 21 are arranged in a matrix, and are used for supporting the multi-layer tab battery cell 3 upward while increasing friction.

[0032] In this embodiment, when the multi-layer tab battery cell 3 is placed on the base 2 , the multi-layer tab battery cell 3 can be welded by operating the welding head 1 located above the base 2 and the multi-layer tab battery cell 3 .

[0033] Furthermore, in this embodiment, the welding teeth 11 are external protruding teeth fixed to the welding head 1, and the cross section of each welding tooth 11 is a conical shape that is "narrow at the top and wide at the bottom". At the same time, the top surface of each welding tooth 11 is an arc-shaped structure, the height of the welding tooth 11 is greater than 3mm, and the diameter of the welding tooth 11 is adjusted according to the number of layers of the multi-layer tab battery core 3. The more the number of tab layers, the larger the welding tooth 11. The maximum diameter of the welding tooth 11 does not exceed 2mm, and the spacing between adjacent welding teeth 11 is 5 to 10mm, preferably 10mm.

[0034] Furthermore, in this embodiment, the print 21 is a convex print fixed on the base 2, and the shape of the print 21 is rectangular. At the same time, the size and depth of the print 21 are adjusted according to the number of layers of the multi-layer tab battery cell 3. The more the tab layers, the larger the print 21 unit and the deeper the depth. The side length and depth of each print 21 do not exceed 2 mm.

[0035] Working principle:

[0036] The multi-layer tab battery cell 3 to be welded is placed between the welding head 1 and the base 2, and the welding teeth 11 of the welding head 1 are pressed down, and cooperate with the printing 21 on the base 2 to achieve the effect of pressing the welding assembly. Finally, the ultrasonic wave is transmitted to the multi-layer tab battery cell 3 through the welding head 1 to achieve pre-welding. Figure 4 As shown, a dot matrix welding spot 31 is formed on its surface. At the welding spot 31, each layer of the tabs is welded as a whole. At the welding spot 31, the tabs are independent of each other. This can ensure that each layer of the multi-layer tab battery 3 is fused, and the original flexibility of the foil is taken into account. After the multi-layer tab battery 3 is welded, it can be Figure 5 , Figure 6 , Figure 7 Bend as shown.

[0037] In addition, it should be noted that in order to ensure that each welding tooth 11 has sufficient and stable supporting force during welding operation and effectively improve the welding effect, the welding position of each welding tooth 11 on the welding head 1 must be able to correspond to the position of at least one print 21 on the base 2.

[0038] Example 2

[0039] A welding machine of this embodiment includes the novel ultrasonic welding structure of embodiment 1 and a welding host connected to the welding head 1. It should be noted that the specific structure of the welding host is not the focus of this embodiment, so it will not be described in detail. At the same time, the advantages of the welding machine and the novel ultrasonic welding structure over the prior art are the same, which will not be described in detail here.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of ultrasonic welding structure, characterized in that: It comprises a welding head and a base; the welding head is arranged above the base, a welding tooth is provided on one end of the welding head close to the base, and a printing is provided on one end of the base close to the welding head; wherein, there are a plurality of welding teeth arranged in a dot matrix for welding multi-layer tab batteries downward; there are a plurality of printings arranged in a matrix for supporting multi-layer tab batteries upward.

2. The novel ultrasonic welding structure according to claim 1 is characterized in that: The welding teeth are external protruding teeth fixed to the welding head, and the cross-section of each welding tooth is a conical shape that is narrow at the top and wide at the bottom.

3. The novel ultrasonic welding structure according to claim 2 is characterized in that: The top surface of the welding tooth is an arc-shaped structure.

4. The novel ultrasonic welding structure according to claim 2 is characterized in that: The height of the welding teeth is greater than 3 mm, the maximum diameter of the welding teeth does not exceed 2 mm, and the distance between adjacent welding teeth is 5 to 10 mm.

5. The novel ultrasonic welding structure according to claim 1 is characterized in that: The printing is an outward convex printing fixed on the base, and the printing shape is a rectangle.

6. The novel ultrasonic welding structure according to claim 5 is characterized in that: The side length and depth of each of the prints do not exceed 2 mm.

7. The novel ultrasonic welding structure according to claim 1 is characterized in that: The welding position of each welding tooth on the welding head can correspond to at least one printed position on the base.

8. The novel ultrasonic welding structure according to any one of claims 1 to 7, characterized in that: When the multi-layer tab battery cell is placed on the base, the multi-layer tab battery cell is welded by operating a welding head located above the base and the multi-layer tab battery cell.

9. A welding machine, characterized in that: It comprises a novel ultrasonic welding structure as described in any one of claims 1 to 8.

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