Die cutter for soft package lithium battery

Abstract

The utility model relates to the technical field of lithium battery die cutting, in particular to a die cutter for a soft package lithium battery, which comprises a processing table, a die cutting component and a collecting device are arranged at the top of the processing table, the die cutting component comprises a die cutter, a collecting groove is arranged in the die cutter, and the die cutter is connected with the collecting device through the collecting groove. Wherein a non-return piece and a filtering piece are detachably connected in the collecting groove, the non-return piece is matched with the filtering piece to collect waste materials and prevent the waste materials from flowing back, the requirements for cutting depth and pole piece pressing are low, burrs of the pole pieces are greatly improved, the single-time service life of the mold can be prolonged, and the production efficiency is improved. And meanwhile, the bad condition that burrs exceed the standard is improved, the fire risk of the battery cell is avoided, waste scraps generated during cutting and part of adsorbed dust can be collected and cleaned through a vacuum pump, and the conditions of pipe fitting blockage and waste backflow can be prevented through a non-return piece and a filtering piece.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery die-cutting, in particular to a die-cutting knife for soft-pack lithium batteries. Background Art

[0002] Lithium battery die-cutting is a key process in the lithium battery manufacturing process, which mainly involves the forming of the tabs and the cutting of the pole sheets. The tabs are metal conductors inside the lithium battery that lead out the positive and negative current collectors. The forming process is usually used as a pre-process for winding or lamination.

[0003] In order to better cut the electrode, it is necessary to use a die-cutting knife for soft-pack lithium batteries for cutting. For example, the prior art Chinese patent publication number "CN106625876A" discloses a battery electrode die-cutting method and circular knife die-cutting equipment. The die-cutting method includes the following steps: 1) unwinding the coated and compacted electrode film roll and passing it through the circular knife die-cutting equipment; 2) simultaneously starting the circular knife die-cutting equipment to cut the electrode waste to obtain multiple partially connected electrode sheets or multiple separate electrode sheets; 3) collecting the electrode waste. The circular knife die-cutting equipment used in this die-cutting method includes a knife roller and an auxiliary roller driven by a drive device, which are arranged parallel to each other in an upper and lower direction. The outer surface of the knife roller is evenly spaced with multiple knife dies with through holes to cooperate with the roller body of the auxiliary roller to cut the electrode waste; the knife die is connected to the waste collection mechanism through the through hole to collect the electrode waste. The present invention facilitates the preparation of large-area battery pole pieces by cutting and collecting waste materials, improves the cleanliness of the battery pole pieces, and prevents pole piece deformation, pole piece beveling, or even pole piece wrinkling, thereby improving the production efficiency and quality of the battery pole pieces.

[0004] In specific operations, the waste collection device is used in conjunction with the waste trough to collect the waste and scraps generated by cutting. However, the waste trough is directly connected to the die-cutting knife. When the collection device stops working, the waste remaining in the collection trough that has not been discharged may flow back and fall onto the processing table due to the lack of non-return measures, affecting the subsequent cutting of lithium batteries. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the prior art that the waste materials remaining in the collection tank lack anti-return measures and may flow back and fall onto the processing table, and to propose a die cutting knife for soft-pack lithium batteries.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A die-cutting knife for soft-pack lithium batteries is designed, comprising a processing platform, a die-cutting assembly and a collection device are arranged on the top of the processing platform, the die-cutting assembly comprises a die-cutting knife, a collection groove is provided in the die-cutting knife, and the die-cutting knife is connected to the collection device through the collection groove;

[0008] Wherein, a check member and a filter member are detachably connected in the collection tank, and the check member cooperates with the filter member to collect waste materials and prevent the waste materials from flowing back.

[0009] Furthermore, at least one cutter body is provided at the bottom of the die cutter, and the cutter bodies are arranged at equal distances to form a partition gap, which penetrates the die cutter and communicates with the collection groove to form a chip guide groove.

[0010] Furthermore, the die-cutting knife is provided with a sealing cover on the discharge side of the collecting trough through a fastener, a sealing gasket is provided between the sealing cover and the die-cutting knife, and the sealing cover is connected to the collecting device through a pipe with a quick-release joint.

[0011] Furthermore, the return stop member includes a pair of rubber stop strips, and the collection groove has a guide portion extending inward on both sides of the bottom, and a connecting groove is formed between the guide portion and the bottom surface of the collection groove. The pair of rubber stop strips are arranged in the connecting groove and are used to cover the chip guide groove.

[0012] Furthermore, the side surface of the sealing cover has a pair of connecting pieces, and a protrusion is integrally formed at the free end of the connecting piece. The end surface of the protrusion is provided with a deformation groove, and guiding inclined surfaces are provided on the edges on both sides.

[0013] Furthermore, the filter element is a filter plate, and through holes matching the connecting element are left on both sides of the filter plate, and it slides against the guide slope through the through holes, and the protrusion cooperates with the sealing cover to press against both sides of the filter plate.

[0014] The utility model proposes a die-cutting knife for soft-pack lithium batteries, which has the beneficial effect that: the utility model uses a die-cutting knife with three end points instead of a traditional die-cutting knife with one end point, which has the advantage that the force on the die-cutting surface is more uniform, the die-cutting points are carried out simultaneously at three locations, the cutting depth and the electrode pressing requirements are relatively low, the electrode burrs are greatly improved, the single-time service life of the mold can be increased, and the burr exceeding the standard is improved at the same time to avoid the risk of battery cell fire, and the waste and scraps generated during cutting and some adsorbed dust can be collected and cleaned by a vacuum pump, and the blockage of pipes and the backflow of waste can be prevented by the check piece and the filter piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the anti-return member of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the filter element of the utility model;

[0018] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of area A.

[0019] In the figure: 1. Processing table; 2. Die-cutting assembly; 21. Die-cutting knife; 211. Knife body; 22. Collection trough; 221. Guide part; 23. Chip guide groove; 24. Sealing cover; 241. Connecting part; 242. Protrusion; 243. Deformation groove; 3. Check member; 31. Rubber stop strip; 4. Filter element; 41. Filter plate. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figure 1-4 A die cutter for soft-pack lithium batteries includes a processing table 1, a die cutting assembly 2 and a collection device are provided on the top of the processing table 1, the die cutting assembly 2 includes a die cutter 21, a collection groove 22 is provided in the die cutter 21, and the die cutter 21 is connected to the collection device through the collection groove 22;

[0022] The collecting tank 22 is detachably connected with a check member 3 and a filter member 4 . The check member 3 cooperates with the filter member 4 to collect waste materials and prevent the waste materials from flowing back.

[0023] It should be added that the die-cutting assembly 2 further includes a driving cylinder, which is fixed to the top of the processing table 1, and its shaft end passes through the processing table 1 and is fixedly connected to a receiving plate, and the die-cutting knife 21 is fixed to the side of the receiving plate;

[0024] Among them, the collecting device is a vacuum pump, which generates negative pressure in the collecting tank 22 through the vacuum pump to extract and collect waste, dust and broken burrs, and a check member 3 is used to prevent the waste remaining in the collecting tank 22 from falling along the chip guide groove 23 onto the processing table 1 when the vacuum pump stops working, and then the filter member 4 is used to prevent the pipe from being blocked.

[0025] Furthermore, at least one blade body 211 is provided at the bottom of the die cutter 21 , and the blade bodies 211 are arranged at equal distances to form a partition gap, which penetrates the die cutter 21 and communicates with the collecting groove 22 to form a chip guide groove 23 .

[0026] Specifically, there are three blade bodies 211. Traditional die-cutting knives use one end point, i.e., one blade body, for cutting. This application improves the use of three end points, i.e., three blade bodies 211, to make the force on the die-cutting surface more uniform. The die-cutting points are carried out simultaneously at three locations. The cutting depth and the electrode pressing requirements are relatively low, which greatly improves the electrode burrs.

[0027] Furthermore, the die-cutting knife 21 is provided with a sealing cover 24 on the discharge side of the collecting trough 22 through a fastener, a sealing gasket is provided between the sealing cover 24 and the die-cutting knife 21, and it is connected to the collecting device through a pipe with a quick-release joint, and the fastener is a locking bolt.

[0028] In more detail, the check member 3 includes a pair of rubber stop strips 31, and the collection groove 22 has a guide portion 221 extending inward on both sides of the bottom, and a connecting groove is formed between the guide portion 221 and the bottom surface of the collection groove 22. The pair of rubber stop strips 31 are arranged in the connecting groove and are used to cover the chip guide groove 23.

[0029] It is worth mentioning that the rubber stopper strip 31 is made of PVC rubber and is arranged in the collecting tank 22 through the connecting groove. When the sealing cover 24 is closed, the rubber stopper strip 31 is fixed by pressing the two sides tightly to prevent it from being separated.

[0030] Under normal circumstances, the rubber stop strip 31 can cover the chip guide groove 23 to prevent the dust in the collection groove 22 from falling onto the processing table 1 along the chip guide groove 23. When the vacuum pump forms a negative pressure on the collection groove 22, the outside air connects the waste along the chip guide groove 23 and enters the collection groove 22. One side of the rubber stop strip 31 then tilts up to avoid the chip guide groove 23, and then returns to its original state to prevent the waste from flowing back.

[0031] In general, the side of the sealing cover 24 has a pair of connecting parts 241, and a protrusion 242 is integrally formed at the free end of the connecting part 241. The end surface of the protrusion 242 is provided with a deformation groove 243 and guiding slopes are provided on both side edges.

[0032] Finally, the filter element 4 is a filter plate 41 , and through holes matching the connecting piece 241 are left on both sides of the filter plate 41 , and it slides against the guide slope through the through holes, and the protrusion 242 cooperates with the sealing cover 24 to press against both sides of the filter plate 41 .

[0033] Specifically, the connecting member 241 has a columnar structure and is made of a material with plastic deformation, such as a composite material or rubber. When the connecting member 241 is resisted by the filter plate 41, the filter plate 41 is guided by the guiding slope, and the avoidance space created by the deformation groove 243 allows the filter plate 41 to pass through the protrusion 242, thereby achieving the effect of clamping and fixing the filter plate 41.

[0034] Working mode: When working, the driving cylinder drives the receiving plate to drive the die-cutting knife 21 to cut the electrode. In addition, during the cutting process, the vacuum pump generates negative pressure in the collection tank 22, and then the outside air is connected to the waste along the chip guide groove 23 into the collection tank 22. One side of the rubber stopper strip 31 is then tilted to avoid the chip guide groove 23, and then restored to its original state to prevent the waste from flowing back.

[0035] After long-term use, the waste in the collection tank 22 needs to be cleaned. After removing the sealing cover 24, the waste in the tank can be cleaned. The filter plate 41 can also be made to contact the protrusion 242 through the guiding slope. The protrusion 242 is contacted and the avoidance space formed by the deformation groove 243 is used to remove the filter plate 41.

[0036] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A die cutter for soft-pack lithium batteries, comprising a processing table (1), characterized in that: A die-cutting assembly (2) and a collecting device are provided on the top of the processing table (1); the die-cutting assembly (2) comprises a die-cutting knife (21); a collecting groove (22) is provided in the die-cutting knife (21), and the die-cutting knife (21) is connected to the collecting device via the collecting groove (22); A check member (3) and a filter member (4) are detachably connected in the collection tank (22), and the check member (3) cooperates with the filter member (4) to collect waste materials and prevent waste materials from flowing back.

2. The die-cutting knife for soft-pack lithium batteries according to claim 1, characterized in that: At least one knife body (211) is provided at the bottom of the die-cutting knife (21), and the knife bodies (211) are arranged at equal distances to form a partition gap, which penetrates the die-cutting knife (21) and communicates with the collecting groove (22) to form a chip guide groove (23).

3. The die-cutting knife for soft-pack lithium batteries according to claim 1, characterized in that: The die-cutting knife (21) is provided with a sealing cover (24) on the discharge side of the collecting trough (22) via a fastener; a sealing gasket is provided between the sealing cover (24) and the die-cutting knife (21), and the sealing cover (24) is connected to the collecting device via a pipe with a quick-release joint.

4. The die-cutting knife for soft-pack lithium batteries according to claim 2, characterized in that: The return stopper (3) includes a pair of rubber stop strips (31), and the collecting groove (22) has guide portions (221) extending inwardly on both sides of the bottom, and a connecting groove is formed between the guide portion (221) and the bottom surface of the collecting groove (22). The pair of rubber stop strips (31) are arranged in the connecting groove and are used to cover the chip guide groove (23).

5. The die-cutting knife for soft-pack lithium batteries according to claim 3, characterized in that: The side of the sealing cover (24) has a pair of connecting pieces (241), and a protrusion (242) is integrally formed at the free end of the connecting piece (241). The end surface of the protrusion (242) is provided with a deformation groove (243) and guiding inclined surfaces are provided on both side edges.

6. The die-cutting knife for soft-pack lithium batteries according to claim 5, characterized in that: The filter element (4) is a filter plate (41), and through holes matching the connecting element (241) are left on both sides of the filter plate (41), and the filter plate (41) slides against the guide inclined surface through the through holes, and the protrusion (242) cooperates with the sealing cover (24) to press against both sides of the filter plate (41).

Images