Welding mechanism

Abstract

The utility model discloses a welding mechanism which comprises a bottom supporting frame. The two ends of the top of the bottom support frame are respectively provided with a battery cell support frame; the opposite ends of the tops of the two battery cell supporting frames are respectively provided with a battery cell positioning groove; a battery cell is placed in each battery cell positioning groove; a connecting piece placing plate is arranged in a gap between the two battery cell supporting frames; a positive electrode connecting sheet and a negative electrode connecting sheet are placed on the top surface of the connecting sheet placing plate; the positive tabs of the two battery cells are overlapped and then placed on the positive connecting sheet; the negative tabs of the two battery cells are overlapped and then placed on the negative connecting sheet; an ultrasonic welding seat is arranged at the top of the bottom support frame and right below the connecting piece placing plate; an ultrasonic welding head is arranged right above the connecting sheet placing plate; spherical welding teeth are distributed on the end face of the ultrasonic welding head; according to the utility model, the wear degree of the welding head can be reduced while the welding quality of the battery tab is ensured, so that the service life of the welding head is prolonged, and the overall production cost of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding mechanism. Background Art

[0002] At present, in the battery production process, for multi-layer laminated batteries, the positive and negative pole ears of the battery need to be welded in multiple layers, need to have good current-carrying capacity, and at the same time need to have a certain welding strength.

[0003] In the prior art, when ultrasonic welding is used for multi-layer laminated batteries, due to the large number of positive and negative electrode tabs, the multi-layer tab welding causes serious wear on the welding head, which will reduce the service life of the welding head and increase the overall production cost of the battery. In addition, when welding multi-layer tabs, a relatively large amount of compression will be brought about, which will cause the tabs to tear around the weld mark, resulting in poor welding.

[0004] It should be noted that ultrasonic welding is a technology that uses ultrasonic high-frequency vibration to apply pressure to reorganize the metal lattice structure between the objects to be welded, thereby achieving welding.

[0005] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a welding mechanism in view of the technical defects in the prior art.

[0007] To this end, the utility model provides a welding mechanism, which includes a horizontally distributed bottom support frame;

[0008] A cell support frame is provided at the left and right ends of the top of the bottom support frame respectively;

[0009] Two battery cell support frames are symmetrically distributed on the left and right;

[0010] The tops of the two battery cell support frames are respectively provided with a battery cell positioning groove at opposite ends;

[0011] In each battery cell positioning groove, a battery cell is horizontally placed;

[0012] The two cells are provided with positive and negative pole ears at the front and rear ends of the opposite sides respectively;

[0013] The positive and negative lugs on the two cells are symmetrically distributed.

[0014] The two battery cell support frames are spaced apart, and a longitudinally distributed connecting piece placement plate is provided in the gap between the two;

[0015] The top surface of the connecting piece placement plate is provided with positive connecting pieces and negative connecting pieces spaced apart from each other.

[0016] The positive tabs on the two cells are placed on the positive connecting sheet after overlapping;

[0017] The negative tabs on the two cells are placed on the negative connecting sheet after overlapping;

[0018] An ultrasonic welding seat is arranged at the top of the bottom support frame just below the connecting piece placement plate;

[0019] When welding operation is required, the positive electrode connecting piece or the negative electrode connecting piece is arranged in a vertically corresponding manner with the ultrasonic welding seat;

[0020] An ultrasonic welding head is provided just above the connecting piece placement plate;

[0021] The upper and lower end surfaces of the ultrasonic welding head are evenly distributed with a plurality of hemispherical or spherical crown-shaped welding teeth;

[0022] The plurality of welding teeth have the same shape.

[0023] It can be seen from the technical solution provided by the above utility model that, compared with the prior art, the utility model provides a welding mechanism with a scientific structural design, which can ensure the welding quality of the pole ears of batteries (such as multi-layer laminated batteries) while reducing the wear of the welding head, thereby increasing the service life of the welding head and reducing the overall production cost of the battery, which has great production practical significance.

[0024] After practical testing, the welding head used in the utility model for ultrasonic welding has spherical welding teeth. After ultrasonic welding with spherical welding teeth, due to the unique structure of the spherical welding teeth, the problem of tab tearing near the ultrasonic welding mark will be effectively avoided, thereby reducing the risk of poor performance of the battery cell caused by tab tearing. In addition, the spherical welding tooth structure can significantly improve the wear of the welding teeth. Compared with the prior art, the wear degree of the spherical welding teeth is lighter and the service life is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional structural schematic diagram of a welding mechanism provided by the utility model;

[0026] Figure 2 A schematic diagram of the connection structure of a welding mechanism provided by the utility model and an existing ultrasonic welding machine (i.e., welding machine) located outside;

[0027] Figure 3 A schematic structural diagram of a welding head provided in a welding mechanism provided by the utility model;

[0028] Figure 4 for Figure 3 A top view of the welding head shown;

[0029] Figure 5 for Figure 3 A front view of the welding head shown;

[0030] Figure 6 for Figure 3 Side view of the welding head shown. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] See also Figures 1 to 6 , the utility model provides a welding mechanism, which is used in ultrasonic welding operations, and includes a horizontally distributed bottom support frame 9;

[0036] A cell support frame 3 is provided at the left and right ends of the top of the bottom support frame 9;

[0037] Two battery cell support frames 3 are symmetrically distributed on the left and right;

[0038] The tops of the two battery cell support frames 3 are respectively provided with a battery cell positioning groove at the opposite end (i.e., the inner end);

[0039] In each battery cell positioning groove, a battery cell 4 is horizontally placed;

[0040] The two battery cells 4 are provided with a positive electrode tab 81 and a negative electrode tab 82 at the front and rear ends of the opposite sides respectively;

[0041] The positive electrode tabs 81 and the negative electrode tabs 82 on the two battery cells 4 are symmetrically distributed.

[0042] The two battery cell support frames 3 are spaced apart, and a longitudinally distributed connecting piece placement plate 5 is provided in the gap between the two;

[0043] The top surface of the connecting piece placement plate 5 is provided with positive connecting pieces 61 and negative connecting pieces 62 spaced apart from each other.

[0044] The positive electrode tabs 81 on the two battery cells 4 are placed on the positive electrode connecting sheet 61 (specifically, on the horizontal distribution section of the positive electrode connecting sheet 61) after overlapping.

[0045] The negative electrode ears 82 on the two battery cells 4 are placed on the negative electrode connecting sheet 62 (specifically, on the horizontal distribution section of the negative electrode connecting sheet 62) after overlapping;

[0046] An ultrasonic welding seat 2 is provided at the top of the bottom support frame 9, just below the connecting piece placement plate 5;

[0047] When welding operation is required, the positive electrode connecting piece 61 (specifically the horizontal distribution section) or the negative electrode connecting piece 62 (specifically the horizontal distribution section) is arranged in upper and lower positive correspondence with the ultrasonic welding seat 2; wherein, when the positive electrode connecting piece 61 and the positive electrode ear 81 need to be welded, the positive electrode connecting piece 61 is located at the top of the ultrasonic welding seat 2, and when the negative electrode connecting piece 62 and the negative electrode ear 82 need to be welded, the negative electrode connecting piece 62 is located at the top of the ultrasonic welding seat 2.

[0048] In the present invention, an ultrasonic welding head 1 is provided just above the connecting piece placement plate 5;

[0049] A plurality of spherical cap-shaped (preferably hemispherical) welding teeth 101 are evenly distributed on the upper and lower end surfaces of the ultrasonic welding head 1;

[0050] The plurality of welding teeth 101 have the same shape.

[0051] In the present use novel, in specific implementation, the ultrasonic horn 1 and the ultrasonic welding seat 2 are connected to an existing ultrasonic welding machine 100 located outside, and the ultrasonic welding machine 100 has a mechanism for driving the ultrasonic horn to move horizontally in the longitudinal direction and move up and down in the vertical direction, and another mechanism for driving the ultrasonic welding seat to move horizontally in the longitudinal direction and move up and down in the vertical direction. Therefore, the ultrasonic horn 1 and the ultrasonic welding seat 2 move horizontally in the longitudinal direction and move up and down in the vertical direction with the welding machine 100, so that the ultrasonic horn 1 and the ultrasonic welding seat 2 reach the working position.

[0052] It should be noted that, based on the supporting structure of the existing ultrasonic welding machine, the ultrasonic welding seat 2 is fixedly connected to the existing ultrasonic welding machine 100, and the ultrasonic welding seat 2 moves synchronously with the ultrasonic welding machine, and can reach the welding position with the ultrasonic welding machine; the ultrasonic welding head 1 is fixedly connected to the ultrasonic welding machine, and is connected to the original designed cylinder inside the ultrasonic welding machine, and can be linked with the ultrasonic welding seat 2 with the movement of the ultrasonic welding machine, and the ultrasonic welding head 1 follows the movement of the ultrasonic welding machine and the movement of the cylinder inside the ultrasonic welding machine to reach the welding position; the ultrasonic welding head 1 and the ultrasonic welding seat 2 realize the ultrasonic welding action by the above actions;

[0053] It should be noted that the positive electrode connecting piece 61 and the negative electrode connecting piece 62 correspond to the ultrasonic welding head 1 and the ultrasonic welding seat 2 in the upper and lower directions; when the positive electrode connecting piece 61 and the negative electrode connecting piece 62 need to be ultrasonically welded, the ultrasonic welding head 1 and the ultrasonic welding seat 2 corresponding to the positive electrode welding position and the ultrasonic welding head 1 and the ultrasonic welding seat 2 corresponding to the negative electrode welding position respectively perform ultrasonic welding.

[0054] In a specific implementation, the above-mentioned existing ultrasonic welding machine may be an ultrasonic welding machine of model ULTRAWELD L20 produced by BRANSON.

[0055] In the present invention, in a specific implementation, a plurality of welding teeth 101 are arranged in at least three rows, and any two welding teeth in each row of welding teeth are distributed at equal intervals.

[0056] It should be noted that, for the ultrasonic welding head 1 of the utility model, the welding teeth thereon are spherical, and the spacing between the welding teeth in the same row is equal, and the spacing between the welding teeth in the same column is equal. The spherical welding teeth improve the stability of the welding teeth, reduce the wear of the welding teeth, and greatly improve the welding life of the welding teeth. At the same time, under the same welding parameters, compared with the prior art, the risk of the tab tearing is greatly reduced; the use of this welding tooth structure can improve the stability of ultrasonic welding, achieve continuous and stable welding strength and welding effect, ensure that the stable welding area has good current capacity, and thus ensure that the battery cell has safe and stable safety performance and physical and chemical properties.

[0057] In the present invention, in a specific implementation, the positive electrode connecting piece 61 includes a vertical distribution section and a horizontal distribution section, and the horizontal distribution section of the positive electrode connecting piece 61 is in contact with the top surface of the connecting piece placement plate 5;

[0058] The negative electrode connecting piece 62 includes a vertical distribution section and a horizontal distribution section. The horizontal distribution section of the negative electrode connecting piece 62 contacts the top surface of the connecting piece placement plate 5 .

[0059] In specific implementation, two connection piece limiting grooves are provided on the connection piece placement plate 5;

[0060] The two connection piece limiting grooves are used to place the horizontal distribution section of the positive electrode connection piece 61 and the horizontal distribution section of the negative electrode connection piece 62 respectively.

[0061] In specific implementation, the horizontal distribution section of the positive electrode connecting piece 61 and the horizontal distribution section of the negative electrode connecting piece 62 have the same shape and size;

[0062] The shape and size of the connection plate limiting groove correspond to and match the shape and size of the horizontal distribution section of the positive electrode connection plate 61 and the horizontal distribution section of the negative electrode connection plate 62 .

[0063] In a specific implementation, vertically penetrating ultrasonic welding seat through holes are provided on the limiting grooves of the two connecting pieces;

[0064] The ultrasonic welding seat through hole is used to pass through the positioning boss 201 on the top of the ultrasonic welding seat 2.

[0065] Therefore, during the welding operation, the bottom surface of the positive electrode connecting piece 61 and the bottom surface of the negative electrode connecting piece 62 are in contact with the positioning boss 201 on the top of the ultrasonic welding seat 2 .

[0066] In a specific implementation, the top surface of the positioning boss 201 is a smooth plane.

[0067] In the present invention, in a specific implementation, the ultrasonic welding head 1 is used to cooperate with the ultrasonic welding seat 2 to press the positive electrode ear 81 and the positive electrode connecting piece 61 therebetween, or to cooperate with the ultrasonic welding seat 2 to press the negative electrode ear 82 and the negative electrode connecting piece 62 therebetween.

[0068] In the utility model, in a specific implementation, the bottom surface of the battery cell positioning groove is a horizontal surface.

[0069] In the present utility model, in specific implementation, a transversely distributed transverse cell positioning block 7 is respectively provided on the front and rear sides of the cell positioning groove;

[0070] The battery cell 4 is located between two battery cell lateral positioning blocks 7 .

[0071] In the present utility model, in a specific implementation, the battery cell positioning groove is provided with a longitudinally distributed battery cell longitudinal positioning block 10 on a side away from the connecting piece placement plate 5 .

[0072] In the present invention, in a specific implementation, the spherical cap shape of the welding tooth 101 and the height of the spherical cap may be equal to one third or one quarter of the diameter of the sphere.

[0073] In the present utility model, in specific implementation, the ultrasonic welding head 1, in addition to being connected to the existing ultrasonic welding machine to achieve movement as mentioned above, can also be moved by other structures that are mature in the prior art and can achieve horizontal movement and vertical movement. For example, it can be driven by a conventional horizontal drive mechanism and a vertical drive mechanism that are mature in the prior art and well-known, to move horizontally in the longitudinal direction and move up and down in the vertical direction. For example, the connection end on the front side of the ultrasonic welding head 1 is linked to the output end of the first cylinder distributed horizontally in the longitudinal direction, so that it moves longitudinally under the drive of the first cylinder. The shell of the first cylinder can be supported by a first cylinder bracket that is located outside and distributed vertically, and the first cylinder bracket is linked to the output end of the second cylinder distributed vertically, and the second cylinder drives the first cylinder bracket and the first cylinder on the first cylinder bracket to move in the vertical direction. Since the horizontal drive mechanism and the vertical drive mechanism are various in form and are existing well-known mature technologies, they will not be repeated here.

[0074] For the utility model, before welding, first, two battery cells are placed in two battery cell positioning grooves, and then, when the positive electrode ear 81 and the positive electrode connecting piece 61 need to be welded together, the positive electrode ear 81 and the positive electrode connecting piece 61 are pressed between the ultrasonic welding head 1 and the ultrasonic welding seat 2, and when the negative electrode ear 82 and the negative electrode connecting piece 62 need to be welded together, the negative electrode ear 82 and the negative electrode connecting piece 62 are pressed between the ultrasonic welding head 1 and the ultrasonic welding seat 2, thereby avoiding the problem of large compression amount in welding of multi-layer electrode ears and ensuring tight compression. Then, after pressing, the ultrasonic welding head is used to perform ultrasonic welding operation on the electrode ear 81 and the positive electrode connecting piece 61 or the negative electrode ear 82 and the negative electrode connecting piece 62, that is, the positive electrode and the negative electrode are respectively welded once, thereby finally completing the welding operation, wherein the welding surface of the ultrasonic welding head has hemispherical welding teeth.

[0075] For the utility model, based on the above design, it is possible to effectively avoid welding abnormalities such as tab tearing existing in the prior art, and it is also beneficial to reduce the degree of wear of the welding head, thereby increasing the service life of the welding head.

[0076] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A welding mechanism, characterized in that: It includes a horizontally distributed bottom support frame (9); A cell support frame (3) is provided at the left and right ends of the top of the bottom support frame (9); Two battery cell support frames (3) are symmetrically distributed on the left and right; The tops of the two battery cell support frames (3) are respectively provided with a battery cell positioning groove at opposite ends; A battery cell (4) is horizontally placed in each battery cell positioning groove; The two battery cells (4) are respectively provided with a positive electrode ear (81) and a negative electrode ear (82) at the front and rear ends of the opposite side; The positive electrode ears (81) and the negative electrode ears (82) on the two battery cells (4) are symmetrically distributed on the left and right sides; The two battery cell support frames (3) are spaced apart, and a longitudinally distributed connection sheet placement plate (5) is provided in the gap between the two; The top surface of the connecting piece placement plate (5) is provided with positive connecting pieces (61) and negative connecting pieces (62) spaced apart from each other. The positive electrode tabs (81) on the two battery cells (4) are placed on the positive electrode connecting sheet (61) after being overlapped; The negative electrode ears (82) on the two battery cells (4) are placed on the negative electrode connecting sheet (62) after being overlapped; An ultrasonic welding seat (2) is provided at the top of the bottom support frame (9) just below the connecting piece placement plate (5); When welding is required, the positive electrode connecting piece (61) or the negative electrode connecting piece (62) is arranged in a vertically corresponding manner with the ultrasonic welding seat (2); An ultrasonic welding head (1) is arranged directly above the connecting piece placement plate (5); A plurality of spherical crown-shaped welding teeth (101) are evenly distributed on the upper and lower end surfaces of the ultrasonic welding head (1); The plurality of welding teeth (101) have the same shape.

2. The welding mechanism according to claim 1, characterized in that: The plurality of welding teeth (101) are arranged in at least three rows, and any two welding teeth in each row of welding teeth are distributed at equal intervals.

3. The welding mechanism according to claim 1, characterized in that: A positive electrode connecting piece (61), comprising a vertical distribution section and a horizontal distribution section, wherein the horizontal distribution section of the positive electrode connecting piece (61) is in contact with the top surface of the connecting piece placement plate (5); The negative electrode connecting piece (62) comprises a vertical distribution section and a horizontal distribution section, and the horizontal distribution section of the negative electrode connecting piece (62) is in contact with the top surface of the connecting piece placement plate (5).

4. The welding mechanism according to claim 3, characterized in that: Two connection piece limiting grooves are arranged on the connection piece placement plate (5); The two connection piece limiting grooves are used to respectively place the horizontal distribution section of the positive electrode connection piece (61) and the horizontal distribution section of the negative electrode connection piece (62).

5. The welding mechanism according to claim 4, characterized in that: The horizontal distribution section of the positive electrode connecting piece (61) and the horizontal distribution section of the negative electrode connecting piece (62) have the same shape and size; The shape and size of the connection plate limiting groove correspond to and match the shape and size of the horizontal distribution section of the positive electrode connection plate (61) and the horizontal distribution section of the negative electrode connection plate (62).

6. The welding mechanism according to claim 4, characterized in that: The two connecting pieces' limiting grooves are provided with vertically penetrating ultrasonic welding seat through holes; The ultrasonic welding seat through hole is used to pass through the positioning boss (201) on the top of the ultrasonic welding seat (2).

7. The welding mechanism according to claim 1, characterized in that: The ultrasonic welding head (1) is used to cooperate with the ultrasonic welding seat (2) to press the positive electrode ear (81) and the positive electrode connecting piece (61) therebetween, or to cooperate with the ultrasonic welding seat (2) to press the negative electrode ear (82) and the negative electrode connecting piece (62) therebetween.

8. The welding mechanism according to claim 1, characterized in that: The bottom surface of the battery cell positioning groove is a horizontal surface; and / or, The welding tooth (101) is in a hemispherical shape.

9. The welding mechanism according to any one of claims 1 to 8, characterized in that: A transversely distributed transverse cell positioning block (7) is respectively provided on the front and rear sides of the cell positioning groove; The battery cell (4) is located between two battery cell transverse positioning blocks (7).

10. The welding mechanism according to claim 9, characterized in that: The battery cell positioning groove is provided with a longitudinally distributed battery cell positioning block (10) on a side away from the connecting piece placement plate (5).

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