Multilayer current collector tab welding device

Abstract

The utility model discloses a multi-layer current collector tab welding device, which belongs to the technical field of batteries and comprises a first foil unwinding mechanism, a multi-layer current collector unwinding mechanism, a second foil unwinding mechanism, a welding mechanism and a winding mechanism. A first foil material output by the first foil material unwinding mechanism, a multi-layer current collector output by the multi-layer current collector unwinding mechanism and a second foil material output by the second foil material unwinding mechanism are subjected to two-side rolling welding in the welding mechanism to form a multi-layer current collector welded with a tab, and the multi-layer current collector is wound in the winding mechanism; the welding mechanism comprises two welding assemblies. The welding assembly comprises a roll welding ultrasonic welding head and a driven roll welding table. The roll welding ultrasonic welding head and the driven roll welding table are oppositely arranged on the two sides of the multi-layer current collector correspondingly. The two roll welding ultrasonic welding heads of the two welding assemblies are arranged on the two sides of the multi-layer current collector respectively, are not overlapped in position and are used for welding the tabs on the two sides of the multi-layer current collector respectively. The welding device has the advantages of uniform welding strength, excellent welding quality and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field relates to a kind of welding device, more particularly to a kind of multilayer current collector tab welding device. BACKGROUND

[0002] Multilayer current collector is a kind of " sandwich " structure, inner layer is polymer macromolecule layer (such as PET, PP or PI), both sides are metal conductive layer (such as Al or Cu), since multilayer current collector is not conducted in thickness direction, cannot directly form tab.

[0003] At present, the tab welding of multilayer current collector is to weld two pieces of pure metal foil on the metal layer on both sides of multilayer current collector by ultrasonic roll welding. The welding equipment is mainly divided into two kinds: one is single ultrasonic welding roll welding head, by applying higher ultrasonic power on one side of metal foil, energy can penetrate metal foil-multilayer current collector-metal foil three-layer structure, so that the metal foil on both sides is welded on the metal layer conductive layer on both sides of multilayer current collector. The disadvantage of this process is that, since the single ultrasonic welding roll welding head is only set on one side, the welding temperature of the metal foil on both sides is different, the welding temperature of the side in contact with the welding head is higher, and the welding temperature of the side away from the welding head is lower, which leads to different welding strength on both sides. The other is double ultrasonic roll welding head, by setting ultrasonic welding roll welding head on both sides of metal foil-multilayer current collector-metal foil three-layer structure, it can ensure that the welding strength on both sides is consistent, but simultaneous welding of double ultrasonic welding head will cause serious heat accumulation, and the polymer macromolecule layer in multilayer current collector has poor heat resistance, which may be damaged during welding process, resulting in reduced reliability of welding position during subsequent use of battery. SUMMARY

[0004] The utility model provides a kind of multilayer current collector tab welding device to overcome the defects of prior art.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of multilayer current collector tab welding device, including first foil unwinding mechanism, multilayer current collector unwinding mechanism, second foil unwinding mechanism, welding mechanism and winding mechanism, first foil unwinding mechanism output first foil, multilayer current collector unwinding mechanism output multilayer current collector and second foil unwinding mechanism output second foil are welded after two face roll welding in welding mechanism, form multilayer current collector with tab welded and wind in winding mechanism;The welding mechanism includes two groups of welding assembly;Welding assembly includes roll welding ultrasonic welding head and driven roll welding welding platform;Roll welding ultrasonic welding head and driven roll welding welding platform are oppositely arranged on both sides of multilayer current collector respectively;Two roll welding ultrasonic welding heads of two groups of welding assembly are respectively arranged on both sides of multilayer current collector, and position is not overlapped, respectively tab on both sides of multilayer current collector is welded.

[0007] To optimize the above technical solutions, the specific measures taken also include:

[0008] Further, it also includes a cooling air blowing mechanism; the cooling air blowing mechanism is arranged between the two groups of welding assemblies and includes at least one cooling air blowing device.

[0009] Further, the cooling air blowing mechanism includes two cooling air blowing devices, which are arranged on the two sides of the multilayer current collector respectively.

[0010] Further, the air outlets of the two cooling air blowing devices are oppositely arranged and both face the multilayer current collector.

[0011] Further, the two groups of welding assemblies have two roll welding ultrasonic welding heads with the same welding mark structure.

[0012] Further, the two groups of welding assemblies have two roll welding ultrasonic welding heads with different welding mark structures.

[0013] Further, the two groups of welding assemblies have two roll welding ultrasonic welding heads with non-overlapping welding mark positions.

[0014] Further, it also includes a convergence mechanism; the convergence mechanism is arranged between the first foil unwinding mechanism, the multilayer current collector unwinding mechanism, the second foil unwinding mechanism and the welding mechanism, and is used to align the first foil output by the first foil unwinding mechanism, the multilayer current collector output by the multilayer current collector unwinding mechanism and the second foil output by the second foil unwinding mechanism before welding.

[0015] Further, the first foil unwinding mechanism, the multilayer current collector unwinding mechanism and the second foil unwinding mechanism are all provided with a tensioning mechanism, which is arranged between the first foil unwinding mechanism, the multilayer current collector unwinding mechanism and the second foil unwinding mechanism and the convergence mechanism respectively; a tensioning mechanism is also arranged between the welding mechanism and the winding mechanism.

[0016] Further, a deviation rectifying device is arranged between the tensioning mechanism of the multilayer current collector unwinding mechanism and the convergence mechanism.

[0017] The utility model discloses a beneficial effect lies in: the utility model provides a kind of multilayer current collector tab welding device, by setting two groups of welding assemblies in the different position of multilayer current collector, realize the step-by-step welding of two side tabs on multilayer current collector, on the one hand, it can avoid the situation of uneven welding strength caused by single welding head, on the other hand, it can also avoid the problem of heat accumulation damage polymer macromolecular layer caused by double welding head welding in the same position.And preferably, the welding marks of both sides are different and the projections do not overlap, to reduce the stress concentration caused by welding in the same position.In addition, the device also adds a cooling air blowing mechanism between the two welding assemblies to cool the multilayer current collector after welding. And preferably, the cooling air blowing equipment is symmetrically arranged on both sides of the multilayer current collector to avoid the problem of welding quality affected by belt shaking caused by unilateral arrangement. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structural schematic diagram of multilayer current collector tab welding device of example 1.

[0019] Figure 2 It is the structural schematic diagram of multilayer current collector tab welding device of example 2.

[0020] The marks in the drawings are: 11, first foil unwinding mechanism;12, multilayer current collector unwinding mechanism;13, second foil unwinding mechanism;21, roll welding ultrasonic welding head;22, driven roll welding station;3, winding mechanism;4, collection mechanism;5, tensioning mechanism;6, deviation rectifying device;7, cooling air blowing equipment. DETAILED DESCRIPTION

[0021] The specific embodiment of the utility model is described below in combination with the drawings and examples.

[0022] Example 1

[0023] As shown in Figure 1 , the embodiment provides a kind of multilayer current collector tab welding device, including first foil unwinding mechanism 11, multilayer current collector unwinding mechanism 12, second foil unwinding mechanism 13, welding mechanism and winding mechanism 3, the first foil of first foil unwinding mechanism 11 output, the multilayer current collector of multilayer current collector unwinding mechanism 12 output and the second foil of second foil unwinding mechanism 13 output are welded after two face roll welding in welding mechanism, form the multilayer current collector of tab welding and wind in winding mechanism 3.

[0024] Welding mechanism includes two groups of welding assemblies.

[0025] Welding assembly includes roll welding ultrasonic welding head 21 and driven roll welding station 22.In the same welding assembly, roll welding ultrasonic welding head 21 and driven roll welding station 22 are oppositely arranged on both sides of multilayer current collector, and the tab on one side of multilayer current collector is welded.

[0026] The two groups of welding assemblies are arranged in sequence along the running direction. That is, the two rolling ultrasonic welding heads 21 of the two groups of welding assemblies are arranged on the two sides of the multilayer current collector respectively and do not overlap in position, and the tabs on the two sides of the multilayer current collector are welded respectively.

[0027] The two groups of welding assemblies step-weld the tabs on the two sides of the multilayer current collector, which can avoid the problem of uneven welding strength on the two sides caused by a single welding head, and also can avoid the problem of heat accumulation damaging the polymer layer in the multilayer current collector caused by welding by a double welding head at the same position.

[0028] The welding mark structures of the two rolling ultrasonic welding heads 21 of the two groups of welding assemblies can be the same or different.

[0029] Preferably, the welding mark structures of the two rolling ultrasonic welding heads 21 are different, and the welding mark positions of the two rolling ultrasonic welding heads 21 do not overlap, that is, the projections of the welding marks formed by the two rolling ultrasonic welding heads 21 on the tabs of the multilayer current collector do not overlap, which can reduce stress concentration caused by welding at the same position. For example, the two rolling ultrasonic welding heads 21 form a tooth-shaped occlusion structure on the two sides.

[0030] During operation, the welding power of the two rolling ultrasonic welding heads 21 is kept consistent, so that the welding strength on the two sides of the multilayer current collector is consistent.

[0031] Specifically, the welding device further comprises a converging mechanism 4. The converging mechanism 4 is composed of two converging rollers arranged opposite to each other on the two sides of the multilayer current collector, and is arranged between the first foil unwinding mechanism 11, the multilayer current collector unwinding mechanism 12, the second foil unwinding mechanism 13 and the welding mechanism, and is used to converge and align the first foil output by the first foil unwinding mechanism 11, the multilayer current collector output by the multilayer current collector unwinding mechanism 12 and the second foil output by the second foil unwinding mechanism 13 before welding.

[0032] The first foil unwinding mechanism 11, the multilayer current collector unwinding mechanism 12 and the second foil unwinding mechanism 13 are all provided with a tensioning mechanism 5, which is arranged between the first foil unwinding mechanism 11, the multilayer current collector unwinding mechanism 12 and the second foil unwinding mechanism 13 and the converging mechanism 4. The welding mechanism and the winding mechanism 3 are also provided with a tensioning mechanism 5. Further specifically, the first foil unwinding mechanism 11, the multilayer current collector unwinding mechanism 12 and the second foil unwinding mechanism 13 are all unwinding rollers, and the tensioning mechanism 5 is composed of three tensioning rollers arranged staggered on the two sides of the multilayer current collector.

[0033] The tensioning mechanism 5 of the multilayer current collector unwinding mechanism 12 and the converging mechanism 4 are also provided with a correction device 6 to avoid running deviation and ensure welding quality.

[0034] Example 2

[0035] AsFigure 2 As shown, the embodiment provides a multi-layer current collector tab welding device, which is basically the same as the structure of the embodiment 1, and the difference is only that the welding device further comprises a cooling air blowing mechanism. The cooling air blowing mechanism is arranged between the two groups of welding assemblies and comprises at least one cooling air blowing device 7. The cooling air blowing mechanism can cool the welded multi-layer current collector.

[0036] Preferably, the cooling air blowing mechanism comprises two cooling air blowing devices 7 arranged on both sides of the multi-layer current collector. The two cooling air blowing devices 7 are symmetrically arranged on the multi-layer current collector, which can improve the stability of the welding process and avoid the problem of belt shaking caused by being arranged on one side.

[0037] Specifically, the air outlets of the two cooling air blowing devices 7 are oppositely arranged and both face the multi-layer current collector. That is, the air outlet directions of the two cooling air blowing devices 7 are opposite and perpendicular to the plane where the multi-layer current collector is located. During operation, the air outlet amounts of the two cooling air blowing devices 7 are the same. Through the opposite air outlet directions and the consistent air outlet amounts, the stability of the welding process can be further improved, so as to ensure the welding quality.

[0038] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back" and the like cited in the utility model are only for the convenience of clear description, and are not used to limit the scope of the utility model. The change or adjustment of the relative relationship is also considered as the scope of the utility model without substantial change of the technical content.

[0039] Finally, it should be pointed out that: the above is only the preferred embodiment of the utility model and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement and the like within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1.A multi-layer current collector tab welding device, comprising a first foil unwinding mechanism, a multi-layer current collector unwinding mechanism, a second foil unwinding mechanism, a welding mechanism and a winding mechanism, the first foil unwinding mechanism, the multi-layer current collector unwinding mechanism and the second foil unwinding mechanism output a first foil, a multi-layer current collector and a second foil respectively, which are welded on both sides in the welding mechanism to form a multi-layer current collector with tabs and are wound in the winding mechanism, characterized in that: the welding mechanism comprises two sets of welding assemblies; the welding assembly comprises a rolling ultrasonic welding head and a driven rolling welding platform; the rolling ultrasonic welding head and the driven rolling welding platform are arranged oppositely on both sides of the multi-layer current collector respectively; the two rolling ultrasonic welding heads of the two sets of welding assemblies are arranged on both sides of the multi-layer current collector respectively and do not overlap in position, and weld the tabs on both sides of the multi-layer current collector respectively. 2.The multi-layer current collector tab welding device according to claim 1, characterized in that: it further comprises a cooling air blowing mechanism; the cooling air blowing mechanism is arranged between the two sets of welding assemblies and comprises at least one cooling air blowing device. 3.The multi-layer current collector tab welding device according to claim 2, characterized in that: the cooling air blowing mechanism comprises two cooling air blowing devices arranged on both sides of the multi-layer current collector respectively. 4.The multi-layer current collector tab welding device according to claim 3, characterized in that: the air outlets of the two cooling air blowing devices are arranged oppositely and both face the multi-layer current collector. 5.The multi-layer current collector tab welding device according to claim 1, characterized in that: the welding marks of the two rolling ultrasonic welding heads of the two sets of welding assemblies are the same. 6.The multi-layer current collector tab welding device according to claim 1, characterized in that: the welding marks of the two rolling ultrasonic welding heads of the two sets of welding assemblies are different. 7.The multi-layer current collector tab welding device according to claim 6, characterized in that: the welding marks of the two rolling ultrasonic welding heads of the two sets of welding assemblies do not overlap. 8.The multi-layer current collector tab welding device according to claim 1, characterized in that: it further comprises a convergence mechanism; the convergence mechanism is arranged between the first foil unwinding mechanism, the multi-layer current collector unwinding mechanism, the second foil unwinding mechanism and the welding mechanism, and is used to converge and align the first foil, the multi-layer current collector and the second foil before welding. 9.The multi-layer current collector tab welding device according to claim 8, characterized in that: the first foil unwinding mechanism, the multi-layer current collector unwinding mechanism and the second foil unwinding mechanism are all provided with a tensioning mechanism, which is arranged between the first foil unwinding mechanism, the multi-layer current collector unwinding mechanism, the second foil unwinding mechanism and the convergence mechanism respectively; a tensioning mechanism is also arranged between the welding mechanism and the winding mechanism. 10.The multi-layer current collector tab welding device according to claim 9, characterized in that: a deviation rectifying device is further arranged between the tensioning mechanism of the multi-layer current collector unwinding mechanism and the convergence mechanism. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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