A composite current collector assembly for cell tab piercing and welding

Abstract

The application discloses a kind of composite current collector composition's cell tab perforation welding equipment, including conveying assembly, for conveying hard tab current collector, and keep hard tab current collector in tight state;Cutting assembly, after traction, hard tab current collector is disconnected;Bump pad gripping assembly, for bump pad orientation adjustment and gripping to pressing station;Shaping assembly, for hard tab current collector and cell tab alignment puncture, and with bump pad, cell tab and hard tab current collector from bottom to top order is pressed into puncture hole, and is pressed with riveting by pressing mechanism.The application is shaped and aligned by automatic mode, and hard tab current collector and cell tab are punctured, and bump pad is moved after being punctured quickly, and cell tab, hard tab current collector and bump pad are riveted and pressed by pressing mechanism, and the overall efficiency is higher and convenient to operate, to prepare for subsequent welding, and improve yield.

Description

Technical Field

[0001] This invention relates to the field of power battery equipment technology, and in particular to a battery cell tab perforation welding device composed of a composite current collector. Background Technology

[0002] The function of the hard tab current collector is to collect current and carry the active materials of the positive and negative electrodes. The working principle of a lithium battery is that lithium ions move between the positive and negative electrodes to achieve charging and discharging. In this process, the hard tab current collector is a key material for the positive and negative electrodes to attach active materials. By contacting the active materials as a conductor, it allows current to be collected and output, thereby realizing the conversion of chemical energy into electrical energy. It has a great influence on the internal resistance and cycle performance of lithium-ion batteries.

[0003] When using battery cells with composite current collectors, the tabs need to be connected to the hard tab current collectors first. Currently, most of these connections are made using piercing welding, but alignment is often impossible after piercing, which increases the difficulty of welding. Summary of the Invention

[0004] To address the aforementioned technical problems, a device for perforating and welding battery cell tabs composed of composite current collectors is provided.

[0005] To achieve the above objectives, in a preferred embodiment, the present invention is configured to include a conveying assembly for conveying the hard tab current collector and keeping it taut; a cutting assembly for disconnecting the pulled hard tab current collector; a protrusion pad gripping assembly for adjusting the orientation of the protrusion pad and gripping it to the pressing station; and a shaping assembly for aligning and piercing the hard tab current collector and the battery cell tab, inserting the protrusion pad into the piercing hole, and pressing the protrusion pad, battery cell tab, and hard tab current collector in a bottom-up order.

[0006] In a preferred embodiment of the present invention, the conveying assembly includes a rigid tab current collector coil fixing rod, the fixing rod being located in the winding hole of the coil, wherein one of the fixing rods is a movable rod that adjusts with the size of the winding hole, the rigid tab current collector coil is pulled by a feeding claw, the feeding claw being fixed on a moving module, and a traction roller being provided between the feeding claw and the coil fixing rod.

[0007] In a preferred embodiment of the present invention, the traction rollers are further configured such that at least three sets are arranged in a V-shape, and the traction roller located in the middle is controlled to move up and down by a tension control cylinder.

[0008] In a preferred embodiment of the present invention, a guide block is provided between the feeding claw and the traction roller, the guide block has a groove for the current collector of the hard electrode tab to pass through, and a clamping block is provided above the groove, the pressure of the clamping block being provided by a cylinder.

[0009] In a preferred embodiment of the present invention, the cutting assembly includes a cutter fixed to a cutter fixing block and controlled to move up and down by a cylinder. A rotating gripper is provided at the next station below the cutter fixing block. The rotating gripper grabs the cut hard electrode current collector and rotates it 180 degrees to send it to the shaping station.

[0010] In a preferred embodiment of the present invention, the protrusion pad gripping assembly includes a mechanical gripper located between the flexible vibratory feeder and the shaping assembly. The flexible vibratory feeder is divided into a discharge area and an adjustment area, and a detection camera is arranged directly above the adjustment area.

[0011] In a preferred embodiment, the present invention may be further configured such that the shaping component includes an upper shaping component and a lower shaping component. The lower shaping component is provided with a lifting mechanism inside and a second movable module is provided at the bottom. A puncture needle and a pad positioning plate are provided at the top of the lower shaping component. The puncture needle and the pad positioning plate have clearance grooves on the horizontal plate. The upper shaping component is provided with a lifting mechanism inside and an elastic pressure plate is fixed at its lower end. The elastic pressure plate has puncture clearance holes and pressure grooves respectively provided at the puncture needle and the pad positioning plate.

[0012] In a preferred embodiment of the present invention, the back of the upper shaping component is provided with a movable pressure plate, the movable pressure plate is fixed to the movable pressure plate fixing block by an elastic element, and the movable pressure plate fixing block is disposed on the fixing frame by a displacement component.

[0013] Beneficial effects: The battery cell tab piercing and welding equipment of the present invention, composed of a composite current collector, aligns the hard tab current collector and the battery cell tab in an automated manner, quickly pierces both and moves the protrusion pad, and uses a pressing mechanism to rivet and press the battery cell tab, hard tab current collector and protrusion pad together, which has high overall efficiency and is easy to operate. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the conveying component of the present invention.

[0017] Figure 3 This is a schematic diagram of the guide block of the present invention.

[0018] Figure 4 This is a schematic diagram of the shaping component of the present invention.

[0019] Figure 5This is a schematic diagram of the movable pressure plate of the present invention.

[0020] Figure 6 This is an enlarged schematic diagram of part A of the present invention.

[0021] In the diagram, 1 is a mechanical gripper; 2 is a detection camera; 3 is a flexible vibratory feeder; 4 is a movable rod; 5 is a tension control cylinder; 6 is a cutter fixing block; 7 is a feeding claw; 8 is a moving module one; 9 is a guide block; 10 is an upper shaping component; 11 is an elastic pressure plate; 12 is a lower shaping component; 13 is a moving module two; 14 is a moving pressure plate fixing block; 15 is a moving pressure plate; 17 is a gasket positioning plate; 18 is a puncture needle; 19 is a rotating gripper; and 20 is a horizontal plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0023] like Figure 1-6 As shown, a battery cell tab piercing welding device composed of a composite current collector includes a conveying assembly for conveying the hard tab current collector and keeping it in a taut state; a cutting assembly for disconnecting the pulled hard tab current collector; a bump pad gripping assembly for adjusting the orientation of the bump pad and gripping it to the pressing station; and a shaping assembly for aligning and piercing the hard tab current collector and the battery cell tab, inserting the bump pad into the piercing hole, and pressing them together in a bottom-up order of bump pad, battery cell tab, and hard tab current collector.

[0024] The conveying assembly includes a rigid tab current collector coil fixing rod, which is located in the winding hole of the coil. One of the fixing rods is a movable rod 4, which adjusts with the size of the winding hole. The rigid tab current collector coil is pulled by a feeding claw 7, which is fixed to a moving module 8. A traction roller is provided between the feeding claw 7 and the coil fixing rod. By moving the movable rod 4, the diameter between the rods can be increased or decreased, thereby accommodating winding holes of different diameters.

[0025] The traction rollers are arranged in at least three sets in a V-shape, with the middle traction roller moving up and down controlled by a tension control cylinder 5. Changing the vertical position of the middle traction roller adjusts the tension on the belt.

[0026] A guide block 9 is provided between the feeding claw 7 and the traction roller. The guide block 9 has a groove for the current collector of the hard electrode tab to pass through, and a clamping block is provided above the groove. The pressure of the clamping block is provided by a cylinder. This facilitates cutting and prevents the belt from retracting after cutting. It also stabilizes the displacement of the belt during the conveying process and reduces the risk of skewing.

[0027] The cutting assembly includes a cutter, which is fixed on a cutter fixing block 6 and is controlled to move up and down by a cylinder. A rotating gripper 19 is provided at the next station below the cutter fixing block 6. The rotating gripper 19 grabs the cut hard electrode current collector and rotates it 180 degrees to send it to the shaping station.

[0028] The protrusion pad gripping assembly includes a mechanical gripper 1, which is located between the flexible vibratory feeder 3 and the shaping assembly. The flexible vibratory feeder 3 is divided into a discharge area and an adjustment area, and a detection camera is installed directly above the adjustment area. Through real-time detection by the camera, the mechanical gripper 1 ensures that it always grips the component with its tip pointing upwards; if the tip is pointing in the wrong direction, it will vibrate again for adjustment.

[0029] The shaping assembly includes an upper shaping assembly 10 and a lower shaping assembly 12. The lower shaping assembly 12 is equipped with a lifting mechanism and a movable module 13 at its bottom. A puncture needle 18 and a pad positioning plate 17 are located at the top of the lower shaping assembly 12. The puncture needle 18 and the pad positioning plate 17 have clearance grooves on the horizontal plate 20. The upper shaping assembly 10 is equipped with a lifting mechanism and an elastic pressure plate 11 is fixed at its lower end. The elastic pressure plate 11 is provided with puncture clearance holes and pressure grooves at the puncture needle 18 and the pad positioning plate 17, respectively. During placement, the battery cell tab is at the bottom and the hard electrode current collector is at the top. The upper shaping component 10 moves downward under servo control. The piercing needle 18 on the lower shaping component 12 can be made of materials such as SKD11, mold steel, or tungsten steel. The upper shaping component 10 has corresponding clearance holes to realize the piercing action of the battery cell tab and the hard electrode current collector. After the piercing action is completed, the lower shaping component 12 descends and moves laterally to the right, so that the protruding pad placed on the pad positioning plate 17 penetrates into the hollow of the tab and the hard electrode current collector, and then is pressed together to realize the state of riveting and pressing the protruding pad, the battery cell tab, and the hard electrode current collector together.

[0030] The upper shaping component 10 has a movable pressure plate 15 on its back. The movable pressure plate 15 is fixed to the movable pressure plate fixing block 14 by an elastic element. The movable pressure plate fixing block 14 is set on the fixing frame by a displacement component. This ensures the stability of the current collector of the hard electrode tab and prevents displacement during puncture.

[0031] It should be noted that in this article, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities.

[0032] The examples above are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A device for through-hole welding of battery cell tabs composed of composite current collectors, characterized in that, include A conveying assembly for conveying the hard tab current collector and keeping the hard tab current collector taut; Disconnect the current collector of the traction-driven hard electrode tab; A bump pad gripping assembly is used for adjusting the orientation of bump pads and gripping them to the pressing station. The shaping assembly is used for aligning and piercing the hard tab current collector and the cell tab, and for inserting the bump pad into the piercing hole, and pressing the bump pad, cell tab and hard tab current collector in a bottom-up order.

2. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 1, characterized in that, The conveying assembly includes a rigid tab current collector coil fixing rod, which is located in the coil hole. One of the fixing rods is a movable rod (4) that is adjusted according to the size of the coil hole. The rigid tab current collector coil is pulled by a feeding claw (7). The feeding claw (7) is fixed on the moving module (8). A traction roller is provided between the feeding claw (7) and the coil fixing rod.

3. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 2, characterized in that, The traction rollers are provided in at least three sets, arranged in a V-shape, with the traction roller in the middle being controlled to move up and down by a tension control cylinder (5).

4. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 2, characterized in that, A guide block (9) is provided between the feeding claw (7) and the traction roller. The guide block (9) has a groove for the current collector of the hard electrode tab to pass through, and a pressing block is provided above the groove. The pressure of the pressing block is provided by a cylinder.

5. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 1, characterized in that, The cutting assembly includes a cutter, which is fixed on a cutter fixing block (6) and is controlled to move up and down by a cylinder. A rotating gripper (19) is provided at the next station below the cutter fixing block (6). The rotating gripper (19) grabs the cut hard electrode current collector and rotates it 180 degrees to send it to the shaping station.

6. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 1, characterized in that, The protrusion pad gripping assembly includes a mechanical gripper (1), which is located between the flexible vibrating plate (3) and the shaping assembly. The flexible vibrating plate (3) is divided into a discharge area and an adjustment area, and a detection camera is set directly above the adjustment area.

7. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 1, characterized in that, The shaping assembly includes an upper shaping assembly (10) and a lower shaping assembly (12). The lower shaping assembly (12) is equipped with a lifting mechanism and a movable module (13) at the bottom. A puncture needle (18) and a pad positioning plate (17) are provided at the top of the lower shaping assembly (12). The puncture needle (18) and the pad positioning plate (17) have clearance grooves on the horizontal plate (20). The upper shaping assembly (10) is equipped with a lifting mechanism and an elastic pressure plate (11) is fixed at the lower end. The elastic pressure plate (11) is provided with puncture clearance holes and pressure grooves at the puncture needle (18) and the pad positioning plate (17) respectively.

8. The electrode tab perforation welding equipment for a battery cell composed of a composite current collector according to claim 7, characterized in that, The upper shaping component (10) has a movable pressure plate (15) on its back. The movable pressure plate (15) is fixed to the movable pressure plate fixing block (14) by an elastic element. The movable pressure plate fixing block (14) is set on the fixing frame by a displacement component.

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