Welding device and rolling equipment

Abstract

The embodiment of the utility model provides a welding device and rolling equipment. The welding device comprises a first conductive roller module, a second conductive roller module and a reinforcing piece. The first conductive roller module and the second conductive roller module are arranged at an interval in the thickness direction of the reinforcing sheet and can form a closed loop, and the first conductive roller module and the second conductive roller module are further configured to move in the length direction of the reinforcing sheet; the reinforcing sheet is arranged close to the first conductive roller module, and a tip part is arranged on the surface, deviating from the first conductive roller module, of the reinforcing sheet; under the condition that the first conductive roller module and the second conductive roller module move to a first position, the composite current collector and the connecting piece in the first area can be welded through the tip part; and under the condition that the first conductive roller module and the second conductive roller module move to a second position, the composite current collector and the connecting piece in the second area can be welded through the tip part.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery manufacturing technology, and more specifically, to a welding device and a rolling equipment. Background Art

[0002] Based on the considerations of reducing the weight of lithium batteries, increasing the energy density of batteries, and improving battery safety, composite current collectors using polymer materials as substrates are gaining more and more attention. The composite current collector includes a substrate and metal layers formed on the upper and lower surfaces of the substrate. The composite current collector has a "sandwich structure", in which the substrate plays a supporting role and the metal layers on both sides play a conductive role. The substrate is generally an organic film, and common ones include PET (polyethylene terephthalate), PP (polypropylene), PI (polyimide), etc.; the metal layer can be a vacuum-evaporated aluminum layer, or a copper layer plated by vacuum sputtering, electroplating, etc.

[0003] However, since the composite current collector contains an organic film (substrate), it is difficult to weld the composite current collector. Non-melting welding such as ultrasonic welding is difficult to penetrate the organic film and it is difficult to weld multiple layers. If melting welding methods such as laser welding are used, the lack of pressure to squeeze out the organic layer will cause a large amount of the organic layer to melt and burn the composite current collector. In addition, since the composite current collector is not conductive along the thickness direction, it cannot be directly resistively welded like welding metal sheets.

[0004] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0005] The purpose of this application is to provide a new technical solution for a welding device and a rolling equipment.

[0006] In a first aspect, an embodiment of the present application provides a welding device. The welding device is used for welding a composite current collector and a connecting sheet;

[0007] The welding device comprises: a first conductive roller module, a second conductive roller module and a reinforcing sheet;

[0008] The first conductive roller module and the second conductive roller module are spaced apart in the thickness direction of the reinforcing sheet and are capable of forming a closed loop, and the first conductive roller module and the second conductive roller module are also configured to be able to move along the length direction of the reinforcing sheet;

[0009] The reinforcing sheet is arranged close to the first conductive roller module, and a tip portion is arranged on a surface of the reinforcing sheet facing away from the first conductive roller module;

[0010] When the first conductive roller module and the second conductive roller module are moved to the first position, the composite current collector and the connecting sheet in the first region can be welded through the tip portion;

[0011] When the first conductive roller module and the second conductive roller module are moved to the second position, the composite current collector in the second region and the connecting sheet can be welded through the tip portion.

[0012] Optionally, the welding device further comprises: a power supply and a transformer, the power supply and the transformer are electrically connected, and the first conductive roller module and the second conductive roller module are electrically connected to the transformer.

[0013] Optionally, the welding device also includes at least one pressure control device, which is arranged on one side of the first conductive roller module and / or the second conductive roller module, and the pressure control device provides pressure in the thickness direction of the reinforcement sheet to the first conductive roller module and the second conductive roller module.

[0014] Optionally, the welding device further includes a driving device connected to the first conductive roller module and the second conductive roller module.

[0015] Optionally, the first conductive roller module and the second conductive roller module roll or move along the length direction of the reinforcement sheet.

[0016] Optionally, the first conductive roller module includes a first conductive voltage roller and a first auxiliary conductive voltage roller, and a first insulating portion is provided between the first conductive voltage roller and the first auxiliary conductive voltage roller.

[0017] Optionally, the second conductive roller module comprises a second conductive voltage roller and a second auxiliary conductive voltage roller, and a second insulating portion is provided between the first conductive voltage roller and the second auxiliary conductive voltage roller.

[0018] Optionally, the first auxiliary conductive voltage roller and the second auxiliary conductive voltage roller are connected via an auxiliary conductive circuit.

[0019] Optionally, when the first conductive roller module and the second conductive roller module form a closed loop, the welding device can form a first loop or a second loop, and the path of the first loop is larger than the path of the second loop.

[0020] Optionally, the first loop is formed when the current passes through the first conductive voltage roller, the reinforcing sheet, the first auxiliary conductive voltage roller, the auxiliary conductive circuit, the second auxiliary conductive voltage roller, the connecting sheet and the second conductive voltage roller in sequence.

[0021] Optionally, the second loop is formed when the current passes through the first conductive roller, the reinforcing sheet, the connecting sheet and the second conductive roller in sequence.

[0022] In a second aspect, an embodiment of the present application further provides a rolling device, which includes the welding device as described in the first aspect.

[0023] According to an embodiment of the present application, a welding device is provided. A longer welding area can be welded by moving the first conductive roller module and the second conductive roller module, so as to realize the connection welding of the composite current collector and improve the welding efficiency of the composite current collector and the connecting sheet.

[0024] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0026] Figure 1 The figure shows a schematic structural diagram of a welding device provided by the prior art.

[0027] Figure 2 The structure of the welding device provided in the embodiment of the present application is shown as follows: Figure 1 .

[0028] Figure 3 The structure of the welding device provided in the embodiment of the present application is shown as follows: Figure 2 .

[0029] Description of reference numerals:

[0030] 1. composite current collector; 10. polymer film layer; 11. first metal coating layer; 12. second metal coating layer;

[0031] 2. Connecting piece;

[0032] 3. First conductive roller module; 30. First conductive voltage roller; 31. First auxiliary conductive voltage roller; 32. First insulating portion;

[0033] 4. second conductive roller module; 40. second conductive voltage roller; 41. second auxiliary conductive voltage roller; 42. second insulating portion;

[0034] 51. Auxiliary conductive circuit;

[0035] 6. Reinforcement sheet; 61. Tip;

[0036] 71. Power supply; 72. Transformer;

[0037] 81. A first transfer foil; 82. A second transfer foil. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0040] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0042] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] The present application embodiment provides a welding device. Figure 2 and Figure 3 , the welding device is used to weld the composite current collector 1 and the connecting sheet 2;

[0044] The welding device comprises: a first conductive roller module 3, a second conductive roller module 4 and a reinforcing sheet 6;

[0045] The first conductive roller module 3 and the second conductive roller module 4 are spaced apart in the thickness direction of the reinforcing sheet 6 and are capable of forming a closed loop, and the first conductive roller module 3 and the second conductive roller module 4 are also configured to be able to move along the length direction of the reinforcing sheet 6;

[0046] The reinforcing sheet 6 is arranged close to the first conductive roller module 3, and a tip portion 61 is arranged on the surface of the reinforcing sheet 6 facing away from the first conductive roller module 3;

[0047] When the first conductive roller module 3 and the second conductive roller module 4 move to the first position, the composite current collector 1 and the connecting sheet 2 in the first region can be welded through the tip portion 61;

[0048] When the first conductive roller module 3 and the second conductive roller module 4 move to the second position, the composite current collector 1 and the connecting sheet 2 in the second region can be welded through the tip portion 61 .

[0049] In the embodiment of the present application, the welding device is used to weld the composite current collector 1 and the connecting piece 2, and the connecting piece 2 is a conductive handle or a pole ear.

[0050] The composite current collector 1 includes a polymer film layer 10, a first metal coating layer 11 and a second metal coating layer 12. The polymer film layer 10 is located between the first metal coating layer 11 and the second metal coating layer 12, and an electrode coating is provided on the surface of each metal coating layer away from the polymer film layer 10. Specifically, the first electrode coating is provided on the side of the first metal coating layer 11 away from the polymer film layer 10, and the second electrode coating is provided on the side of the second metal coating layer 12 away from the polymer film layer 10. Since the polymer film layer 10 is provided between the two metal coating layers, it is difficult to directly weld them by resistance welding, ultrasonic welding or laser welding.

[0051] in Figure 1 This is a common solution nowadays, which realizes welding by adding a transfer foil, specifically adding a first transfer foil 81 and a second transfer foil 82, which are respectively connected to the first metal coating 11 and the second metal coating 12 by ultrasonic roll welding, and then the first transfer foil 81 and the second transfer foil 82 are welded to the connecting sheet 2 by laser welding or ultrasonic welding. In this way, each layer of composite current collector 1 is welded, corresponding to two layers of transfer foil, which increases the number of welding times and welding materials, occupies the space in the length direction, and reduces the volume energy density and weight energy density.

[0052] In the embodiment of the present application, a welding device is provided. When the welding device welds the composite current collector 1 and the connecting sheet 2, the tip 61 of the reinforcing sheet 6, driven by heat and pressure, pierces the multi-layer composite current collector 1 and the first metal coating layer 11 and the second metal coating layer 12 to achieve welding, and finally achieves welding with the connecting sheet 2. As the first conductive roller module 3 and the second conductive roller module 4 move along the length direction of the reinforcing sheet 6, continuous welding can be achieved.

[0053] Specifically, the welding device includes a first conductive roller module 3, a second conductive roller module 4 and a reinforcing sheet 6, wherein the first conductive roller module 3 and the second conductive roller module 4 are spaced apart in the thickness direction of the reinforcing sheet 6 and can form a closed loop, which means that current can flow between the two modules to form a complete circuit. When the welding device is welding, the composite current collector 1 and the connecting sheet 2 are also located between the first conductive roller module 3 and the second conductive roller, wherein when the reinforcing sheet 6 is relatively closer to the first conductive roller module 3, the composite current collector 1 and the connecting sheet 2 are located between the reinforcing sheet 6 and the second conductive roller module 4, and when the first conductive roller module 3 and the second conductive roller module 4 form a closed loop, the reinforcing sheet 6, the composite current collector 1 and the connecting sheet 2 located between the first conductive roller module 3 and the second conductive roller module 4 can be welded together under the action of heat and pressure. Optionally, a carrier can be set between the first conductive roller module 3 and the second conductive roller module 4, and the reinforcing sheet 6, the composite current collector 1 and the connecting sheet 2 are set on the carrier to facilitate welding the composite current collector 1 and the connecting sheet 2 together through the first conductive roller module 3, the second conductive roller module 4 and the reinforcing sheet 6.

[0054] In addition, the first conductive roller module 3 and the second conductive roller module 4 can also move along the length direction of the reinforcing sheet 6, which can also be understood as: when the welding device is welding in real time, the first conductive roller module 3 and the second conductive roller module 4 also move along the length direction of the composite current collector 1 and the connecting sheet 2. In this way, the welding device can achieve continuous welding in length.

[0055] Secondly, the reinforcing sheet 6 is arranged close to the first conductive roller module 3, and a tip portion 61 is arranged on the surface of the reinforcing sheet 6 facing away from the first conductive roller module 3. This tip portion 61 plays a key role in the welding process. Specifically, when the first conductive roller module 3 and the second conductive roller module 4 form a closed loop, the first conductive roller module 3 and the second conductive roller module 4 apply pressure and transfer heat to the reinforcing sheet 6. Under the action of pressure and heat, the tip portion 61 of the reinforcing sheet 6 can pierce the first metal coating 11 of the composite current collector 1 and fuse with the first metal coating 11, further melt and pierce the polymer film layer 10 of the composite current collector 1 due to the high temperature, further pierce and fuse the second metal coating 12 of the composite current collector 1, and finally the tip portion 61 of the reinforcing sheet 6 pierces the composite current collector 1 and contacts the connecting sheet 2. Optionally, when there are multiple layers of composite current collectors 1 welded, the process of “piercing welding-melting piercing-piercing welding” is repeated, and finally the tip 61 of the reinforcing sheet 6 pierces the metal layers of all composite current collectors 1 and contacts and welds with the connecting sheet 2 .

[0056] When the first conductive roller module 3 and the second conductive roller module 4 move to the first position, the first region of the composite current collector 1 and the connecting sheet 2 can be welded through the tip portion 61. Similarly, when the first conductive roller module 3 and the second conductive roller module 4 move to the second position, the tip portion 61 can weld the second region of the composite current collector 1 and the connecting sheet 2. Specifically, when the first conductive roller module 3 and the second conductive roller module 4 move to the first position, after the first region of the composite current collector 1 and the connecting sheet 2 are welded together through the tip portion 61, the first conductive roller module 3 and the second conductive roller module 4 move to the second position, and the first conductive roller module 3 and the second conductive roller module 4 apply pressure and transfer heat to the tip portion 61 located in the second region, so that the tip portion 61 located in the second region punctures the composite current collector 1 and welds the connecting sheet 2. When the first conductive roller module 3 and the second conductive roller module 4 continue to move forward along the length direction of the reinforcing sheet 6, continuous welding in length is achieved.

[0057] In one embodiment, referring to Figure 2 The welding device further includes: a power supply 71 and a transformer 72 , the power supply 71 and the transformer 72 are electrically connected, and the first conductive roller module 3 and the second conductive roller module 4 are electrically connected to the transformer 72 .

[0058] In this embodiment, the power source 71 is a device for providing electric energy, which provides the required power for the entire welding device, while the transformer 72 plays a role in regulating voltage and current, ensuring that the current can stably and safely pass through the first conductive roller module 3 and the second conductive roller module 4.

[0059] Specifically, the power supply 71 and the transformer 72 are electrically connected, which means that the electric energy output by the power supply 71 will be adjusted by the transformer 72 for voltage and current, and then supplied to other parts of the welding device. Specifically, the first conductive roller module 3 and the second conductive roller module 4 are electrically connected to the transformer 72, which means that the current adjusted by the transformer 72 will flow through these two modules to form a closed loop. When these two modules move in the length direction of the reinforcing sheet 6, the current will pass through the parts of them that are in contact with the composite current collector 1 and the connecting sheet 2, thereby generating heat, thereby achieving continuous welding.

[0060] In one embodiment, the welding device also includes at least one pressure control device, which is arranged on one side of the first conductive roller module 3 and / or the second conductive roller module 4, and the pressure control device provides pressure in the thickness direction of the reinforcing sheet 6 to the first conductive roller module 3 and the second conductive roller module 4.

[0061] In this embodiment, the welding device also includes a pressure control device. For example, the welding device includes a pressure control device, which can be located on one side of the first conductive roller module 3 or on one side of the second conductive roller module 4. Alternatively, the welding device includes two pressure control devices, one of which is located on one side of the first conductive roller module 3 and the other is located on one side of the second conductive roller module 4.

[0062] Specifically, the welding device includes two pressure control devices, one of which is located above the first conductive roller module 3, and the other is located below the second conductive roller module 4. The pressure control device applies pressure between the first conductive roller module 3 and the second conductive roller module 4, so as to further clamp the reinforcing sheet 6 and the composite current collector 1 and the connecting sheet 2, which is conducive to the tip 61 of the reinforcing sheet 6 piercing the composite current collector 1 to achieve welding with the connecting sheet 2.

[0063] In one embodiment, the welding device further includes a driving device, and the driving device is connected to the first conductive roller module 3 and the second conductive roller module 4 .

[0064] In this embodiment, the welding device further includes a driving device, which drives the first conductive roller module 3 and the second conductive roller module 4 to move along the length direction of the reinforcing sheet 6. For example, the welding device includes a driving device, which is connected to the first conductive roller module 3 and the second conductive roller module 4 at the same time, that is, the first conductive roller module 3 and the second conductive roller module 4 are driven to connect through one driving device. Alternatively, the welding device includes two driving devices, one of which drives the first conductive roller module 3 to connect, and the other drives the second conductive roller module 4 to connect, and the first conductive roller module 3 and the second conductive roller module 4 are driven to move along the length direction of the reinforcing sheet 6 through the two driving devices.

[0065] In one embodiment, the first conductive roller module 3 and the second conductive roller module 4 roll or move along the length direction of the reinforcing sheet 6 .

[0066] In this embodiment, the movement mode of the first conductive roller module 3 and the second conductive roller module 4 along the reinforcing sheet 6 is defined, wherein the first conductive roller module 3 and the second conductive roller module 4 can roll along the reinforcing sheet 6 or the first conductive roller module 3 and the second conductive roller module 4 can translate along the length direction of the reinforcing sheet 6. It should be noted that the movement modes of the first conductive roller module 3 and the second conductive roller module 4 along the length direction of the reinforcing sheet 6 can be the same or different, as long as the first conductive roller module 3 and the second conductive roller module 4 can move along the length direction of the reinforcing sheet 6. Figure 3, showing a schematic diagram of the first conductive roller module 3 and the second conductive roller module 4 rolling along the length direction of the reinforcing sheet 6.

[0067] In a specific embodiment, referring to Figure 2 The first conductive roller module 3 includes a first conductive voltage roller 30 and a first auxiliary conductive voltage roller 31 , and a first insulating portion 32 is provided between the first conductive voltage roller 30 and the first auxiliary conductive voltage roller 31 .

[0068] The second conductive roller module 4 includes a second conductive voltage roller 40 and a second auxiliary conductive voltage roller 41 . A second insulating portion 42 is disposed between the first conductive voltage roller 30 and the second auxiliary conductive voltage roller 41 .

[0069] The first auxiliary conductive roller 31 and the second auxiliary conductive roller 41 are connected via an auxiliary conductive circuit 51 .

[0070] In this embodiment, the first conductive roller module 3 includes a first conductive voltage roller 30 and a first auxiliary conductive voltage roller 31. A first insulating portion 32 is arranged between the first conductive voltage roller 30 and the first auxiliary conductive voltage roller 31. The first conductive voltage roller 30 and the first auxiliary conductive voltage roller 31 are not directly electrically conductive, and the first conductive voltage roller 30 and the first auxiliary conductive voltage roller 31 are electrically conductive through a reinforcing sheet 6.

[0071] The second conductive roller module 4 includes a second conductive voltage roller 40 and a second auxiliary conductive voltage roller 41. A second insulating portion 42 is arranged between the second conductive voltage roller 40 and the second auxiliary conductive voltage roller 41. The second conductive voltage roller 40 and the second auxiliary conductive voltage roller 41 are not directly conductive. When the composite current collector 1 and the connecting sheet 2 are located between the reinforcing sheet 6 and the second conductive roller module 4, the second conductive voltage roller 40 and the second auxiliary conductive voltage roller 41 are electrically conductive through the connecting sheet 2.

[0072] In a specific embodiment, referring to Figure 2 , one or more layers of the composite current collector 1 and the connecting sheet 2 are stacked between the first conductive voltage roller 30 and the second conductive voltage roller 40, and one or more layers of the composite current collector 1 and the connecting sheet 2 are also stacked between the first auxiliary conductive voltage roller 31 and the second auxiliary conductive voltage roller 41, and the pressure control device applies pressure to make the first conductive voltage roller 30 and the second conductive voltage roller 40 clamp the reinforcing sheet 6 and the composite current collector 1 and the connecting sheet 2, and make the first auxiliary conductive voltage roller 31 and the second auxiliary conductive voltage roller 41 clamp the reinforcing sheet 6, the composite current collector 1 and the connecting sheet 2, so that the first conductive voltage roller 30 and the first auxiliary conductive voltage roller 31 are in contact with the reinforcing sheet 6, the reinforcing sheet 6 is in contact with the first metal coating 11 of the composite current collector 1, the second metal coating 12 of the composite current collector 1 is in contact with the connecting sheet 2, and the connecting sheet 2 is in contact with the second conductive voltage roller 40 and the second auxiliary conductive voltage roller 41.

[0073] The power supply 71 and the transformer 72 are powered on, and the current passes through the circuit of the first conductive voltage roller 30-reinforcement sheet 6-first auxiliary conductive voltage roller 31-auxiliary conductive circuit 51-second auxiliary conductive voltage roller 41-connecting sheet 2-second conductive voltage roller 40, and ohmic heat is generated. Driven by pressure and heat, the tip 61 of the reinforcement sheet 6 pierces the first metal coating layer 11 of the composite current collector 1 and is welded with the first metal coating layer 11, and further melts and pierces the polymer film layer 10 of the composite current collector 1 due to the high temperature, and further pierces and welds the second metal layer of the composite current collector 1. When there are multiple layers of composite current collectors 1 welded, the process of "piercing and welding-melting and piercing-piercing and welding" is repeated, and finally the tip 61 of the reinforcement sheet 6 pierces all the metal layers of the composite current collector 1 and contacts the connecting sheet 2.

[0074] When the tip 61 of the reinforcing sheet 6 pierces the metal layer of all the composite current collectors 1 and comes into contact with the connecting sheet 2, a new current loop is formed, that is, through the first conductive voltage roller 30-reinforcing sheet 6-tip 61 of the reinforcing sheet 6-connecting sheet 2-second conductive voltage roller 40, the current generates heat, so that the tip 61 of all the composite current collectors 1 that are pierced and welded to form a weld with the connecting sheet 2.

[0075] When the tip portion 61 located in the first area punctures the composite current collector 1 and is welded to the connecting sheet 2, the first conductive voltage roller 30, the second conductive voltage roller 40, and the first auxiliary conductive voltage roller 31 and the second auxiliary conductive voltage roller 41 move along the length direction of the reinforcing sheet 6, and pressure and temperature are applied to the tip portion 61 located in the second area to puncture the composite current collector 1 and weld the connecting sheet 2. The first conductive voltage roller 30, the second conductive voltage roller 40, and the first auxiliary conductive voltage roller 31 and the second auxiliary conductive voltage roller 41 continue to move forward to achieve continuous welding over the length.

[0076] It should be noted that the structure of the first conductive roller module 3 includes but is not limited to the scheme described above, and the structure of the second conductive roller module 4 includes but is not limited to the scheme described above. For example, the first conductive roller module 3 and the second conductive roller module 4 can also only include a conductive voltage roller and an auxiliary conductive voltage roller, but a pilot loop is set between the reinforcing sheet 6 and the connecting sheet 2, and the pilot loop can be turned on first. At this time, the tip 61 of the reinforcing sheet 6 can pierce the composite current collector 1 and contact the connecting sheet 2 under the action of heat and pressure. When the tip 61 contacts the connecting sheet 2, the first conductive roller, the reinforcing sheet 6, the tip 61 of the reinforcing sheet 6 and the connecting sheet 2 form a conductive loop, so that the tip 61 that pierces and welds all the composite current collectors 1 is welded to the connecting sheet 2.

[0077] In one embodiment, when the first conductive roller module 3 and the second conductive roller module 4 form a closed loop, the welding device can form a first loop or a second loop, and the path of the first loop is greater than the path of the second loop.

[0078] In this embodiment, the first conductive roller module 3 and the second conductive roller module 4 form a closed loop, wherein the welding device can first form a first loop, specifically, since the tip 61 of the reinforcing sheet 6 does not pierce the composite current collector 1, the first loop is formed when the current sequentially passes through the first conductive roller 30, the reinforcing sheet 6, the first auxiliary conductive roller 31, the auxiliary conductive circuit 51, the second auxiliary conductive roller 41, the connecting sheet 2 and the second conductive roller 40. The first loop generates heat, and the tip 61 of the reinforcing sheet 6 can pierce the composite current collector 1 layer by layer under the drive of pressure and heat and melt each layer of the composite current collector 1 to form diffusion welding.

[0079] When the tip 61 of the reinforcement part pierces the composite current collector 1 and contacts the connecting sheet 2, the welding device forms a second loop. Specifically, the second loop is formed when the current sequentially passes through the first conductive roller 30, the reinforcement sheet 6, the connecting sheet 2, and the second conductive roller 40. When the second loop is formed, since the path of the first loop is greater than the path of the second loop, the current will not pass through the components forming the first loop, but will pass through the components forming the second loop. When the current passes through the components forming the second loop, the current generates heat so that the tip 61 that pierces and welds the metal coating of all the composite current collectors 1 is welded to the connecting sheet 2.

[0080] In an alternative embodiment, referring to Figure 3 , when the first conductive roller module 3 and the second conductive roller module 4 roll along the length direction of the reinforcing sheet 6, the diameters of the first conductive roller module 3 and the second conductive roller module 4 are D, the lower bottom diameter of the tip 61 is x2, the upper bottom diameter of the tip 61 is x1, the height of the tip 61 of the reinforcing sheet 6 is y, the thickness of the first metal coating 11 and the thickness of the second metal coating 12 in the composite current collector 1 are both h1, the thickness of the polymer film layer 10 in the composite current collector 1 is h2, the number of layers of the composite current collector 1 is n (n≥1), the thickness of the connecting sheet 2 is h3, and the welding device satisfies the following rules: 1.6*n*h1≤y≤n*(2*h1+0.8*h2), (x1-x2) / y≤0.5, so that the composite current collector 1 and the connecting sheet 2 can be welded by the welding device.

[0081] The embodiment of the present application further provides a rolling device. The rolling device includes the welding device as described above. The welding device is applied to the rolling device, and the rolling device can realize continuous and efficient welding operations during material processing.

[0082] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0083] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A welding device, characterized in that: Applicable to welding a composite current collector (1) and a connecting sheet (2); The welding device comprises: a first conductive roller module (3), a second conductive roller module (4) and a reinforcing sheet (6); The first conductive roller module (3) and the second conductive roller module (4) are arranged at intervals in the thickness direction of the reinforcing sheet (6) and are capable of forming a closed loop. The first conductive roller module (3) and the second conductive roller module (4) are also configured to be able to move along the length direction of the reinforcing sheet (6); The reinforcing sheet (6) is arranged close to the first conductive roller module (3), and a tip portion (61) is arranged on a surface of the reinforcing sheet (6) facing away from the first conductive roller module (3); When the first conductive roller module (3) and the second conductive roller module (4) are moved to the first position, the composite current collector (1) and the connecting sheet (2) in the first region can be welded via the tip portion (61); When the first conductive roller module (3) and the second conductive roller module (4) are moved to the second position, the composite current collector (1) and the connecting sheet (2) in the second region can be welded via the tip portion (61).

2. The welding device according to claim 1, characterized in that: The welding device further comprises: a power source (71) and a transformer (72), wherein the power source (71) and the transformer (72) are electrically connected, and the first conductive roller module (3) and the second conductive roller module (4) are electrically connected to the transformer (72).

3. The welding device according to claim 1, characterized in that: The welding device further comprises at least one pressure control device, which is arranged on one side of the first conductive roller module (3) and / or the second conductive roller module (4), and the pressure control device is used to provide pressure in the thickness direction of the reinforcing sheet (6) to the first conductive roller module (3) and the second conductive roller module (4).

4. The welding device according to claim 1, characterized in that: The welding device further comprises a driving device, wherein the driving device is connected to the first conductive roller module (3) and the second conductive roller module (4).

5. The welding device according to claim 1, characterized in that: The first conductive roller module (3) and the second conductive roller module (4) roll or move along the length direction of the reinforcing sheet (6).

6. The welding device according to claim 1, characterized in that: The first conductive roller module (3) comprises a first conductive voltage roller (30) and a first auxiliary conductive voltage roller (31), and a first insulating portion (32) is provided between the first conductive voltage roller (30) and the first auxiliary conductive voltage roller (31).

7. The welding device according to claim 6, characterized in that: The second conductive roller module (4) includes a second conductive voltage roller (40) and a second auxiliary conductive voltage roller (41), and a second insulating portion (42) is provided between the first conductive voltage roller (30) and the second auxiliary conductive voltage roller (41).

8. The welding device according to claim 7, characterized in that: The first auxiliary conductive roller (31) and the second auxiliary conductive roller (41) are connected via an auxiliary conductive circuit (51).

9. The welding device according to claim 8, characterized in that: When the first conductive roller module (3) and the second conductive roller module (4) form a closed loop, the welding device can form a first loop or a second loop, and the path of the first loop is larger than the path of the second loop.

10. The welding device according to claim 9, characterized in that: The first circuit is formed when the current passes through the first conductive voltage roller (30), the reinforcing sheet (6), the first auxiliary conductive voltage roller (31), the auxiliary conductive circuit (51), the second auxiliary conductive voltage roller (41), the connecting sheet (2) and the second conductive voltage roller (40) in sequence.

11. The welding device according to claim 9, characterized in that: When the current passes through the first conductive roller (30), the reinforcing sheet (6), the connecting sheet (2) and the second conductive roller (40) in sequence, the second loop is formed.

12. A rolling device, characterized in that: The rolling equipment comprises a welding device as claimed in any one of claims 1-11.

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