Soft package lithium battery tab cutting mechanism

Abstract

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a soft package lithium battery tab cutting mechanism which comprises a lifting device, a cutting tool body and a cutter assembly, the lifting device is arranged above the cutting tool body, and the cutter assembly is arranged in front of the cutting tool body. The mechanism has high flexibility and reliability, the upper cutter and the lower cutter can be replaced as required to adjust the cutting shape and size of the tab, and the replacement workload is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a tab cutting mechanism for soft-pack lithium batteries. Background Technology

[0002] In recent years, with the continuous expansion of the application of pouch lithium-ion batteries in various industries, their production technology has undergone rapid iteration and upgrading, mainly reflected in faster charging speeds and higher energy density. As one of the most crucial links in the manufacturing process of pouch lithium-ion batteries, the performance of the equipment used in the cell winding process directly affects the production efficiency and quality of the batteries. Faced with the industry's ever-increasing technical requirements and capacity efficiency demands, how to modify and upgrade existing winding equipment to adapt to new technology applications has become a key issue that industry technicians urgently need to solve.

[0003] In the production of battery cells, the cut positive and negative tabs need to be welded to the positive and negative electrode sheets of the cell, respectively. The materials for the positive and negative tabs of pouch lithium batteries must meet requirements such as good conductivity, corrosion resistance, weldability, and compatibility with other positive and negative electrode materials. Currently, aluminum (Al) and its alloys are the mainstream choice for positive tabs. However, to improve the connection compatibility between the tabs and external circuits and to adapt to more diverse application scenarios, positive tabs made of nickel-to-aluminum composite metal materials are gradually emerging.

[0004] However, the existing positive electrode cutting mechanisms of winding machines are mostly of the straight-blade type, which cannot meet the cutting requirements of nickel-to-aluminum composite electrodes. Purchasing a new winding machine to adapt to this type of electrode would not only require a huge initial investment, but also take more than six months for the new equipment to reach a stable production state, which would seriously affect the factory's production capacity. At the same time, the existing straight-blade positive electrode cutting mechanisms have low motion precision and lack the basis for modification and upgrading. This situation has significantly constrained the efficient production of pouch lithium batteries. Utility Model Content

[0005] The purpose of this utility model is to provide a new type of mold head to solve the technical problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a soft-pack lithium battery tab cutting mechanism, comprising a lifting device, a cutting fixture body and a cutting tool assembly, wherein the lifting device is disposed above the cutting fixture body and the cutting tool assembly is disposed in front of the cutting fixture body;

[0007] The lifting device includes a cylinder fixing bracket, a cylinder, a floating joint and a laser sensor. The cylinder is fixed on the cylinder fixing bracket, and the main body of the cutting fixture is connected to the bottom of the cylinder through the floating joint. The laser sensor is installed in front of the cylinder fixing bracket.

[0008] The main body of the cutting fixture includes a cylinder lifting main board, a discharge plate guide post, an aluminum alloy steel ball bushing, a cutting fixture base, a waste guide trough, and a waste collection box. The cylinder lifting main board is slidably connected to the discharge plate guide post. The discharge plate guide post is fitted with an aluminum alloy steel ball bushing. The cutting fixture base is located below. The waste guide trough is located in front of the cutting fixture base. The waste collection box is located below the waste guide trough.

[0009] The tool assembly includes a pressing device, an upper tool, a lower tool, an upper tool mounting base, and a lower tool mounting base. The upper tool is a punch and is fixed to the upper tool mounting base. The lower tool is a die and is fixed to the lower tool mounting base. The pressing device is located above the upper tool mounting base. The pressing device includes a high-precision oil-free bushing, a guide post, and a spring. The spring is sleeved on the guide post.

[0010] Preferably, the laser sensor of the lifting device is a Keyence LV-H64 laser sensor.

[0011] Preferably, the aluminum alloy steel ball bushing of the main body of the cutting fixture is of model MBSH13-35, and the unloading plate guide bushing that cooperates with it is of model SGBBS13-30. The unloading plate guide bushing and the base of the cutting fixture are bonded together with Loctite special adhesive, and the unloading plate guide post is of model TGPN13-80.

[0012] Preferably, the tool assembly further includes a tool guide mechanism, which uses an aluminum alloy steel ball bushing of model MBSH10-25 and a stripper plate guide bushing of model SGBBS10-25. The stripper plate guide bushing and the lower tool mounting seat are bonded together with Loctite special adhesive. The stripper plate guide post of the tool assembly is model TGPN10-60.

[0013] Preferably, the high-precision oil-free bushing of the pressing device is model BFLB4-6.

[0014] Preferably, the waste collection box adopts a side-pull-out structure, and the cutting fixture base is provided with neodymium magnets, which are used to attract and fix the waste collection box.

[0015] Preferably, the area below the blade of the lower cutter is widened, and both the waste guide channel and the waste collection box are demagnetized.

[0016] Preferably, the upper and lower blades can be replaced with blades of different shapes and sizes.

[0017] Preferably, both the upper and lower blades are made of tungsten-cobalt alloy YG8.

[0018] The beneficial effects of this utility model are: the mechanism has high flexibility and reliability, the upper and lower blades can be replaced as needed to adjust the cutting shape and size of the electrode tabs, greatly reducing the workload of replacement; the waste channel size is increased and the waste guide groove and collection box are demagnetized, and the side pull-out collection box design effectively prevents waste from getting stuck and is easy to clean; the laser sensor accurately positions the feeding and pressing device to ensure cutting accuracy, and the high rigidity guide component ensures stable operation, which not only improves the cutting quality, but can also be extended to the cutting of negative electrode tabs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a perspective view of the lifting device in this utility model;

[0021] Figure 3 This is a perspective view of the main body of the cutting fixture in this utility model;

[0022] Figure 4 This is a perspective view of the tool assembly in this utility model;

[0023] Figure 5 This is a perspective view of the tool assembly in this utility model from another direction. Detailed Implementation

[0024] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0025] like Figure 1 As shown, a cutting fixture for the tabs of a soft-pack lithium battery includes a cutting fixture body 2 placed below a lifting device 1 and a tool assembly 3 disposed in front of the cutting fixture body 2.

[0026] like Figure 2 As shown, the lifting device 1 includes a cylinder fixing bracket 1-1, a cylinder 1-2 located on the right side of the cylinder fixing bracket 1-1, a floating joint 1-3 threadedly connected below the cylinder 1-2, a laser sensor bracket 1-4 located in front of the cylinder fixing bracket 1-1, and a laser sensor 1-5 located on the right side of the laser sensor bracket 1-4.

[0027] like Figure 3As shown, the main body 2 of the cutting fixture includes a cylinder lifting main plate 2-1, a first unloading plate guide post 2-2-1 and a second unloading plate guide post 2-2-2 arranged symmetrically on the left and right sides below the cylinder lifting main plate, a first aluminum alloy steel ball bushing 2-3-1 and a second aluminum alloy steel ball bushing 2-3-2 respectively mounted coaxially on the unloading plate guide post, a first unloading plate guide sleeve 2-4-1 and a second unloading plate guide sleeve 2-4-2 respectively mounted coaxially on the aluminum alloy steel ball bushing, a cutting fixture base 2-5 located below the unloading plate guide sleeve, a tab support plate 2-6 located behind the cutting fixture base and a waste guide groove 2-7 located in front of the cutting fixture base, a waste collection box 2-8 located below the waste guide groove, a neodymium magnet 2-10 located on the left side of the waste collection box and a waste collection box bracket 2-9 located below it.

[0028] like Figure 4 and Figure 5 As shown, the tool assembly 3 includes a pressure device connecting plate 3-1, a first unloading plate guide post 3-2-1 and a second unloading plate guide post 3-2-2 arranged symmetrically on both sides below the connecting plate, a first high-precision oil-free bushing 3-3-1 and a second high-precision oil-free bushing 3-3-2 installed on the outer ring of the unloading plate guide posts, a first buffer spring 3-4-1 and a second buffer spring 3-4-2 located below the high-precision oil-free bushings, a pressure plate 3-5 located below the buffer springs, and an upper tool mounting seat 3-6 located above the pressure plate. The upper blade 3-7 in front of the upper blade mounting seat and the first unloading plate guide post 3-8-1 and the second unloading plate guide post 3-8-2 are symmetrically arranged on both sides below it. The first aluminum alloy steel ball bushing 3-9-1 and the second aluminum alloy steel ball bushing 3-9-2 are coaxially mounted at the lower end of the unloading plate guide post. The first unloading plate guide bushing 3-10-1 and the second unloading plate guide bushing 3-10-2 are mounted on the outer ring of the aluminum alloy steel ball bushing. The lower blade mounting seat 3-11 is mounted on the outside of the unloading plate guide bushing. The lower blade 3-12 is mounted above the lower blade mounting seat.

[0029] Work process:

[0030] 1. The positive electrode tab is fed by the feeding mechanism of the winding machine (the feeding mechanism is part of the winding machine equipment, and its structure and principle will not be described in detail here). When the adhesive on the electrode tab strip blocks the reflected light of the laser sensor, it sends a signal to the PLC control system of the winding machine. The control system controls the start and stop of the positive electrode tab feeding mechanism, thus ensuring that the feeding length is consistent each time.

[0031] 2. After the positive electrode feeding mechanism stops in place, the cylinder of the electrode cutting tool lifting device presses down, and the tool assembly moves downward along the unloading plate guide column as the cylinder lifts up.

[0032] 3. After descending to a certain height, the pressing device first contacts the electrode tab. As the height decreases, the buffer spring is continuously compressed. The pressing device flattens and holds the electrode tab to be cut, preventing the electrode tab from bending or deforming and preventing the electrode tab from moving during cutting.

[0033] 4. As the tool assembly continues to move downwards, the upper punch of the tab cutting tool penetrates the lower die, completing the cutting of the tab;

[0034] 5. The cut-off waste material falls into the waste collection box along the cutting blade and waste guide groove. If the waste collection box is full, it can be pulled out from the side. After the waste is cleared, the waste collection box can be reinstalled. The neodymium magnet will hold the waste collection box in place to prevent it from moving.

[0035] 6. After cutting is completed, the cylinder begins to rise, and the tool assembly moves upward along the guide post of the unloading plate as the main board of the cylinder rises and falls. The pressing device leaves the electrode tab and returns to its original position under the action of spring force. The upper and lower blades also separate.

[0036] 7. Once the above steps complete one electrode cutting operation, repeat the above steps for subsequent operations.

[0037] For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A mechanism for cutting tabs of a soft-pack lithium battery, characterized in that, It includes a lifting device, a cutting fixture body, and a cutting tool assembly. The lifting device is located above the cutting fixture body, and the cutting tool assembly is located in front of the cutting fixture body. The lifting device includes a cylinder fixing bracket, a cylinder, a floating joint and a laser sensor. The cylinder is fixed on the cylinder fixing bracket, and the main body of the cutting fixture is connected to the bottom of the cylinder through the floating joint. The laser sensor is installed in front of the cylinder fixing bracket. The main body of the cutting fixture includes a cylinder lifting main board, a discharge plate guide post, an aluminum alloy steel ball bushing, a cutting fixture base, a waste guide trough, and a waste collection box. The cylinder lifting main board is slidably connected to the discharge plate guide post. The discharge plate guide post is fitted with an aluminum alloy steel ball bushing. The cutting fixture base is located below. The waste guide trough is located in front of the cutting fixture base. The waste collection box is located below the waste guide trough. The tool assembly includes a pressing device, an upper tool, a lower tool, an upper tool mounting base, and a lower tool mounting base. The upper tool is a punch and is fixed to the upper tool mounting base. The lower tool is a die and is fixed to the lower tool mounting base. The pressing device is located above the upper tool mounting base. The pressing device includes a high-precision oil-free bushing, a guide post, and a spring. The spring is sleeved on the guide post.

2. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The laser sensor of the lifting device is a Keyence LV-H64 laser sensor.

3. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The aluminum alloy steel ball bushing of the main body of the cutting fixture is model MBSH13-35, and the unloading plate guide bushing that matches it is model SGBBS13-30. The unloading plate guide bushing and the base of the cutting fixture are bonded together with Loctite special adhesive. The unloading plate guide post is model TGPN13-80.

4. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The tool assembly also includes a tool guide mechanism, which uses an aluminum alloy steel ball bushing of model MBSH10-25 and a stripper plate guide bushing of model SGBBS10-25. The stripper plate guide bushing and the lower tool mounting seat are bonded together with Loctite special adhesive. The stripper plate guide post of the tool assembly is model TGPN10-60.

5. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The high-precision oil-free bushing of the pressing device is model BFLB4-6.

6. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The waste collection box adopts a side-pull-out structure, and the cutting fixture base is equipped with neodymium magnets, which are used to attract and fix the waste collection box.

7. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The area below the blade of the lower cutter is widened, and both the waste guide channel and the waste collection box are demagnetized.

8. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, The upper and lower blades can be replaced with blades of different shapes and sizes.

9. The soft-pack lithium battery tab cutting mechanism according to claim 1, characterized in that, Both the upper and lower blades are made of tungsten-cobalt alloy YG8.

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