Pole piece die cutting dust removal mechanism, pole piece die cutting device and thermal compounding equipment

Abstract

The invention provides a pole piece die cutting dust removal mechanism, a pole piece die cutting device and thermal compounding equipment, and the pole piece die cutting dust removal mechanism comprises a dust blowing assembly which is used for blowing dust on the cutting edge of a pole piece material belt; the dust collection assembly is arranged corresponding to the cutting edge of the pole piece material belt so as to receive the dust blown away by the dust blowing assembly; wherein the dust blowing assembly and the dust collection assembly are arranged at intervals with the pole lugs of the pole piece material belt.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing, and in particular to a pole piece die cutting dust removal mechanism, a pole piece die cutting device and a thermal composite device. Background Art

[0002] During the production and processing of battery pole pieces, the positive pole piece or negative pole piece strip is die-cut by using a die-cutting device to form a plurality of continuously arranged pole piece units, each of which includes a pole piece and a pole ear, wherein the cut edge of the pole piece will form carbon powder and wire drawing. The wire drawing and carbon powder on the cut edge of the pole piece will be brought into the core package behind, causing a short circuit. In the related art, a dust removal mechanism is provided to remove dust from the pole piece strip. If the dust suction port of the dust removal mechanism is too close to the pole ear of the pole piece strip, the pole ear will be folded and separated from the pole piece, thereby damaging the pole ear. Summary of the invention

[0003] The embodiments of the present invention provide a pole piece die cutting dust removal mechanism, a pole piece die cutting device and a thermal composite device, which can improve the technical problem of the pole ear damage caused by the dust removal process of the dust removal mechanism and the sheet material strip.

[0004] In a first aspect, an embodiment of the present invention provides a dust removal mechanism for a pole piece mold, comprising:

[0005] A dust blowing component is used to blow dust off the cut edges of the pole piece strip;

[0006] A dust collecting component, arranged corresponding to the cut edge of the pole piece strip to receive the dust blown away by the dust blowing component;

[0007] Wherein, the dust blowing assembly and the dust suction assembly are both spaced apart from the pole ears of the pole sheet material strip.

[0008] In one embodiment, the dust blowing assembly includes a dust blowing piece, which is provided with a dust blowing port. The pole ear of the pole piece strip is protruding toward a side away from the dust blowing port relative to the cutting edge. The distance between the dust blowing port and the cutting edge of the pole piece strip is d1, and d1 is set to 10 mm to 20 mm.

[0009] In one embodiment, the dust suction assembly includes a dust suction box, and the distance between the dust suction port and the end of the pole ear of the pole piece strip is d2, and d2 is set to 10 mm to 30 mm.

[0010] In one embodiment, a portion of the pole piece strip is located on a roller, and the dust blowing assembly is located on one side of the roller; and / or the dust suction assembly is located at an end of the roller.

[0011] In one embodiment, the plane where the dust blowing port is located is inclined relative to the axial direction of the roller.

[0012] In one embodiment, the dust removal mechanism for the pole piece die cutting further includes a connecting rod, and the dust blowing assembly is configured to be movably connected to the connecting rod to adjust the position of the dust blowing assembly relative to the connecting rod.

[0013] In one embodiment, the dust blowing assembly further includes a dust blowing member and a connecting plate. The connecting plate connects the dust blowing member and the connecting rod, and the connecting plate is configured to be movable relative to the connecting rod along the axial direction of the passing roller.

[0014] In one embodiment, the dust suction box is arranged to surround at least a part of the passing roller, and the length of the dust suction box surrounding the passing roller along the circumferential direction of the passing roller is greater than the length of the pole piece strip fitting the passing roller along the circumferential direction of the passing roller.

[0015] In one embodiment, the passing roller further includes a guiding structure, and the guiding structure is arranged to guide the dust into the dust suction box.

[0016] In one embodiment, the guiding structure includes a guiding boss located at the end of the passing roller assembly. The guiding boss includes a guiding inclined surface, and the included angle of the guiding inclined surface relative to the axial direction of the passing roller is 10° - 30°.

[0017] In a second aspect, an embodiment of the present invention provides a pole piece die cutting device, and the pole piece die cutting device includes the above-mentioned dust removal mechanism for the pole piece die cutting.

[0018] In a third aspect, an embodiment of the present invention provides a thermal compounding device. The thermal compounding device includes the above-mentioned pole piece die cutting device and a thermal compounding device. The pole piece die cutting device is arranged to cut and form a plurality of continuous pole piece units, and the thermal compounding device is arranged to thermally roll press the pole piece units and a separator to form a thermally compounded pole piece assembly.

[0019] Advantageous effects of the embodiments of the present invention:

[0020] In the embodiments of the present invention, by providing a dust blowing assembly to blow away the dust at the edge of the tab of the pole piece strip, and by providing a dust suction assembly at the cutting edge corresponding to the pole piece strip to receive the dust blown away by the dust blowing assembly, the technical problems of wire drawing at the cutting edge of the pole piece strip and carbon powder entering the core package are effectively improved. Among them, the dust received by the dust suction assembly comes from the dust blown away by the dust blowing assembly. The dust blowing assembly and the dust suction assembly are both arranged at intervals from the tab of the pole piece strip, so as to prevent the dust blowing assembly and the dust suction assembly from acting on the tab of the pole piece strip and causing the tab to be pulled by the pole piece and resulting in the tab breaking. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a schematic three-dimensional structure diagram of a pole piece strip provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic three-dimensional diagram of a perspective view of a pole piece die-cutting and dust-removing mechanism provided by an embodiment of the present invention;

[0024] Figure 3 is Figure 2 a partial enlarged view of;

[0025] Figure 4 is a schematic three-dimensional diagram of another perspective view of a pole piece die-cutting and dust-removing mechanism provided by an embodiment of the present invention;

[0026] Figure 5 is Figure 4 a partial enlarged view of;

[0027] Reference numerals in the drawings:

[0028] 100, pole piece die-cutting and dust-removing mechanism;

[0029] 1, blowing dust assembly; 11, blowing dust member; 12, blowing dust port; 13, connecting plate;

[0030] 2, dust suction assembly; 21, dust suction box; 22, dust suction pipe; 23, dust suction port;

[0031] 31, fixing plate; 32, support plate; 33, connecting rod;

[0032] 4, over-roller assembly; 41, first over-roller; 42, second over-roller; 43, guiding structure; 44, guiding inclined surface

[0033] 5, pole piece strip; 51, pole piece unit; 511, pole piece; 512, tab; Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0035] In the production and processing process of battery electrode sheets, the positive electrode sheet tape or the negative electrode sheet tape is die-cut on the electrode sheet tape 5 by using an electrode sheet die-cutting device to form a plurality of continuously arranged electrode units, such as Figure 1 As shown, each electrode unit 51 includes an electrode sheet 511 and an electrode tab 512. The electrode sheet 511 is the main part of the positive or negative electrode of the battery, which is composed of a current collector and an active material coating, and is the core area of the battery electrochemical reaction. The electrode tab 512 is a conductive metal protrusion extending from the current collector of the electrode sheet and is the channel for current to enter and exit. After the electrode sheet tape 5 is die-cut, there will be wire drawing and carbon powder after cutting at the cutting edge of the electrode sheet. The wire drawing and carbon powder at the cutting edge of the electrode sheet will be brought into the subsequent core package, resulting in a short circuit.

[0036] In the embodiments of the present application, a dust removal mechanism 100 for electrode sheet die-cutting is provided, such as Figure 2 and Figure 3 As shown, the dust removal mechanism 100 for electrode sheet die-cutting includes a dust blowing component 1, a dust suction component 2, and a roller passing component 4.

[0037] The roller passing component 4 includes a first roller 41 and a second roller 42. The electrode sheet tape 5 is attached to a part of the surfaces of the first roller 41 and the second roller 42. The first roller 41 and the second roller 42 are arranged to drive the die-cut electrode sheet tape 5.

[0038] The dust blowing component 1 is arranged close to the cutting edge of the electrode sheet tape 5 and is arranged to blow dust on the cutting edge of the electrode sheet tape 5.

[0039] The dust suction component 2 is arranged corresponding to the cutting edge of the electrode sheet tape 5 to receive the dust blown away by the dust blowing component 1. Among them, both the dust blowing component 1 and the dust suction component 2 are arranged at intervals from the electrode tab 512 of the electrode sheet tape 5.

[0040] By arranging a dust blowing component 1 near the cutting edge of the pole piece strip 5, the dust at the edge of the tab 512 of the pole piece strip 5 can be blown away, and by arranging a dust suction component 2 at the corresponding cutting edge of the pole piece strip 5 to receive the dust blown away by the dust blowing component 1, the technical problems of wire drawing at the cutting edge of the pole piece strip 5 and carbon powder entering the core package are effectively improved. Further, both the dust blowing component 1 and the dust suction component 2 are arranged at intervals from the tab 512, so as to prevent the dust blowing component 1 and the dust suction component 2 from acting on the tab 512 of the pole piece strip 5 and causing the tab 512 to be pulled by the pole piece 511 and the tab 512 to rupture.

[0041] In some embodiments, the dust blowing component 1 is located on one side of the first over-roller 41 or the second over-roller 42, and the dust suction component 2 is located at the end of the first over-roller 41 or the second over-roller 42.

[0042] The pole piece strip 5 is circumferentially arranged around a part of the surface of the first over-roller 41 and the second over-roller 42. The dust blowing component 1 is arranged on one side of the first over-roller 41 or the second over-roller 42, so that the dust blowing component 1 can blow away the dust on the cutting edge of the pole piece strip 5. The dust suction component 2 is correspondingly arranged at the end of the first over-roller 1 or the second over-roller 42, so that the dust blown away by the dust blowing component 1 enters the dust suction component 2 along the first over-roller 41 or the second over-roller 42, and at the same time, the dust suction port 23 of the dust suction component 2 keeps an appropriate distance from the tab 512 of the pole piece strip 5.

[0043] In some embodiments, the dust blowing component 1 includes a dust blowing member 11, which can be a blowing nozzle. The dust blowing member 11 is arranged in a box shape, and a dust blowing port 12 is arranged on the dust blowing member 11. The plane where the dust blowing port 12 is located is inclined with respect to the axis direction of the first over-roller 41 and / or the second over-roller 42.

[0044] By arranging the plane where the dust blowing port 12 is located to be inclined, while keeping an appropriate distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5, the wind flowing out of the dust blowing port 12 can still blow away the dust such as carbon powder and wire drawing attached to the cutting edge of the pole piece strip 5.

[0045] In some embodiments, as Figure 3 and Figure 4 shown, the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is d1, and d1 is 10 mm to 20 mm. For example, the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 can be 10 mm, 11 mm, 13 mm, 15 mm, 17 mm, 20 mm, and the range between any two of the above values or the value between any two of the above values.

[0046] The inventor found through research that when the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is less than 10 mm, the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is relatively close, and the air flowing out of the dust blowing port 12 will cause the ear 512 to fold, thus damaging the ear 512. When the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is greater than 20 mm, the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is relatively far, and the wind force formed by the dust blowing port 12 on the cutting edge of the pole piece strip 5 is too small, resulting in the dust on the cutting edge of the pole piece strip 5 being difficult to clean up.

[0047] In some embodiments, the inclination angle of the plane where the dust blowing port 12 is located with respect to the axial direction of the first over-roller 41 and / or the second over-roller 42 is adjusted according to the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5, so as to adjust the wind force formed by the dust blowing port 12 on the cutting edge of the pole piece strip 5. For example, when the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is 10 mm to 15 mm, the included angle range between the plane where the dust blowing port 12 is located and the axial direction of the first over-roller 41 and / or the second over-roller 42 is 40° to 45°. When the distance between the dust blowing port 12 and the cutting edge of the pole piece strip 5 is 15 mm to 20 mm, the included angle range between the plane where the dust blowing port 12 is located and the axial direction of the first over-roller 41 and / or the second over-roller 42 is 30° to 40°.

[0048] In some embodiments, the pole piece die-cutting dust removal structure 100 further includes a fixing plate 31, a support plate 32 and a connecting rod 33. The first over-roller 41 and the second over-roller 42 are both fixed on the fixing plate 31. The support plate 32 is connected to the fixing plate 31, and the connecting rod 33 connects the support plate 32 and the dust blowing assembly 1. Among them, the dust blowing assembly 1 is configured to be movably connected to the connecting rod 33, and the dust blowing assembly 1 is configured to adjust the position of the dust blowing assembly 2 relative to the connecting rod 33 according to the width of the pole piece strip 5.

[0049] It can be understood that when the width of the pole piece strip 5 is relatively large, the dust blowing assembly 1 is configured to move along the axial direction of the first over-roller 41 or the second over-roller 42 towards the direction close to the cutting edge of the pole piece strip 5. When the width of the pole piece strip 5 is relatively small, the dust blowing assembly 1 is configured to move along the axial direction of the first over-roller 41 or the second over-roller 42 towards the direction away from the cutting edge of the pole piece strip 5, so as to keep a suitable spacing range between the dust suction port 12 of the dust suction assembly 1 and the cutting edge of the pole piece strip 5, and the suitable spacing range is 10 mm to 20 mm.

[0050] In some embodiments, the dust blowing assembly 1 includes a dust blowing member 11 and a connecting plate 13. The connecting plate 13 connects the dust blowing member 11 and the connecting rod 33, and the connecting plate 13 is configured to move relative to the connecting rod 33 along the axial direction of the first over-roller 41 or the second over-roller 42. Specifically, the connecting rod 33 is provided as a lead screw with a threaded structure, and a threaded connection is provided between the connecting plate 13 and the connecting rod 33.

[0051] In some embodiments, the dust suction assembly 2 includes a dust suction box 21 and a dust suction pipe 22. The dust suction pipe 22 is externally connected to a negative pressure. A dust suction port 23 is provided at the top of the dust suction box 21. Dust such as carbon powder and wire drawing attached to the cut edge of the pole piece strip 5 is separated from the pole piece strip 5 under the dust blowing action of the dust blowing assembly 1, enters the dust suction box 21 through the dust suction port 23, and enters the dust suction pipe 22 under the negative pressure action of the dust suction pipe 22.

[0052] In some embodiments, the dust suction box 21 is arranged to surround at least a part of the first over-roller 41 or the second over-roller 42, wherein the length of the dust suction box 21 surrounding the first over-roller 41 or the second over-roller 42 is greater than the length of the pole piece strip 5 attached to the first over-roller 41 or the second over-roller 42, so that the dust blown away from the cut edge of the pole piece strip 5 by the dust blowing assembly 1 can all enter the dust suction box 21 along the first over-roller 41 or the second over-roller 42. For example, the length of the pole piece strip 5 attached to the first over-roller 41 or the second over-roller 42 is 15 mm, and the length of the dust suction box 21 surrounding the first over-roller 41 or the second over-roller 42 is 45 mm.

[0053] In some implementations, the value range of the ratio of the length of the dust suction box 21 surrounding the first over-roller 41 or the second over-roller 42 to the circumference of the first over-roller 41 or the second over-roller 42 is 1 / 5 to 3 / 5.

[0054] In some embodiments, continue to refer to Figure 3 and Figure 4 , the distance d2 between the dust suction port 23 of the dust suction box 21 and the end of the tab 512 of the pole piece strip 5 is 10 mm to 30 mm.

[0055] The inventor found through research that when the height of the tab 512 is within 30 mm, when the distance between the dust suction port 23 of the dust suction box 21 and the end of the tab 512 of the pole piece strip 5 is 10 mm to 20 mm, while maintaining the dust suction capacity, the dust suction port 23 can avoid the negative pressure generated by the dust suction port 23 from pulling on the tab 512. When the height of the tab 512 is greater than 30 mm, when the distance between the dust suction port 23 of the dust suction box 21 and the end of the tab 512 of the pole piece strip 5 is 20 mm to 30 mm, while maintaining the dust suction capacity, the dust suction port 23 can avoid the negative pressure generated by the dust suction port 23 from pulling on the tab 512.

[0056] In some embodiments, the first over-roller 41 or the second over-roller 42 further includes a guiding structure 43, which is located at one end of the first over-roller 41 or the second over-roller 42, and the guiding structure 43 is configured to introduce dust into the dust suction box 21.

[0057] By providing the guiding structure 43, the dust at the cutting edge of the pole piece strip 5 can enter the dust suction box 21 along the guiding structure 43.

[0058] In some embodiments, such as Figure 4 and Figure 5 As shown, the guiding structure 43 includes a guiding boss located at the end of the first over-roller 41 or the second over-roller 42. The guiding boss includes a guiding inclined surface 44, and the included angle of the guiding inclined surface 44 relative to the axis direction of the first over-roller 41 or the second over-roller 42 is α, and α is 10° to 30°.

[0059] The inventor found through research that the included angle of the guiding inclined surface 44 relative to the axis direction of the first over-roller 41 or the second over-roller 42 needs to be set according to the wire drawing condition of the cutting edge of the pole piece strip 5. When the length of the wire drawing at the cutting edge of the pole piece strip 5 is short, if the included angle between the guiding inclined surface 44 and the axis direction of the first over-roller 41 or the second over-roller 42 is too small, the wire drawing is easily blown by the dust blowing assembly 1 outside the dust suction port 23. When the length of the wire drawing at the cutting edge of the pole piece strip 5 is long, if the included angle between the guiding inclined surface 44 and the axis direction of the first over-roller 41 or the second over-roller 42 is too large, a part of the wire drawing will break and thus be blown outside the dust suction port 23. When the length of the wire drawing at the cutting edge of the pole piece strip 5 is within 50 mm, the included angle between the guiding inclined surface 44 and the axis direction of the first over-roller 41 or the second over-roller 42 is 20° to 30°. When the length of the wire drawing at the cutting edge of the pole piece strip 5 is greater than 50 mm, the included angle between the guiding inclined surface 44 and the axis direction of the first over-roller 41 or the second over-roller 42 is 10° to 20°.

[0060] The embodiment of the present application further provides a pole piece die-cutting device, which includes a die-cutting mechanism and the above-mentioned pole piece die-cutting dust removal mechanism. The die-cutting mechanism can be a laser cutter. After the die-cutting mechanism performs die-cutting on the pole piece strip 5, a plurality of continuous pole piece units 51 are formed. The pole piece unit 51 includes a pole piece 511 and a pole ear 512. The pole piece die-cutting dust removal mechanism 100 removes dust from the cutting edge of the pole piece strip 5, thereby preventing carbon powder and wire drawing at the cutting edge from entering the core package in the subsequent process.

[0061] An embodiment of the present application further provides a thermal lamination device, which includes the above-mentioned pole piece die-cutting device, pole piece cutting device, pole piece thermal lamination device and stacking device. The pole piece die-cutting device die-cuts a pole piece strip to form a plurality of continuous pole piece units. The pole piece cutting device cuts the plurality of continuous pole piece units to form individual pole piece units. The pole piece thermal lamination device forms a thermally laminated pole piece assembly by thermally rolling a single positive pole piece unit, a separator and a single negative pole piece unit. The stacking device stacks a plurality of thermally laminated pole piece assemblies to form a core package.

[0062] The embodiments of the present invention have been introduced in detail above. Specific examples are used herein to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only for helping to understand the method and its core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A dust removal mechanism for pole piece die cutting, characterized in that, include: A dust blowing component is used to blow dust off the cut edges of the pole piece strip; A dust collecting component, arranged corresponding to the cut edge of the pole piece strip to receive the dust blown away by the dust blowing component; Wherein, the dust blowing assembly and the dust suction assembly are both arranged at intervals from the pole ears of the pole sheet material strip.

2. The dust removal mechanism for pole piece die cutting according to claim 1, characterized in that, The dust blowing assembly includes a dust blowing piece, which is provided with a dust blowing port. The pole ear of the pole piece strip is protruded relative to the cutting edge toward a side away from the dust blowing port. The distance between the dust blowing port and the cutting edge of the pole piece strip is d1, and d1 is set to 10mm to 20mm.

3. The dust removal mechanism for pole piece die cutting according to claim 2, characterized in that, The dust suction assembly comprises a dust suction box, the dust suction box is provided with a dust suction port, the distance between the dust suction port and the end of the pole ear of the pole piece strip is d2, and d2 is set to 10 mm to 30 mm.

4. The dust removal mechanism for pole piece die cutting according to claim 3, wherein, A portion of the pole piece strip is located on the roller, and the dust blowing assembly is located on one side of the roller; and / or the dust suction assembly is located at an end of the roller.

5. The dust removal mechanism for pole piece die cutting according to claim 4, wherein The plane where the dust blowing port is located is inclined relative to the axial direction of the roller.

6. The dust removal mechanism for pole piece die cutting according to claim 4, characterized in that, The pole piece mold cutting dust removal mechanism also includes a connecting rod, and the dust blowing assembly is configured to be movably connected to the connecting rod to adjust the position of the dust blowing assembly relative to the connecting rod.

7. The dust removal mechanism for pole piece die cutting according to claim 6, wherein, The dust blowing assembly further comprises a dust blowing member and a connecting plate, wherein the connecting plate connects the dust blowing member and the connecting rod, and the connecting plate is configured to be movable relative to the connecting rod along the axial direction of the roller.

8. The dust removal mechanism for pole piece die cutting according to claim 4, characterized in that, The dust suction box is arranged to surround at least a portion of the roller, and the length of the dust suction box surrounding the roller along the circumference of the roller is greater than the length of the pole piece strip attached to the roller along the circumference of the roller.

9. The dust removal mechanism for pole piece die cutting according to claim 8, characterized in that, The roller further comprises a guide structure, and the guide structure is configured to guide the dust into the dust collection box.

10. The dust removal mechanism for pole piece die cutting according to claim 9, characterized in that, The guide structure comprises a guide boss located at the end of the roller assembly, the guide boss comprises a guide slope, and the included angle of the guide slope relative to the axial direction of the roller is α, and α is 10° to 30°.

11. A pole piece die-cutting device, characterized in that The pole piece die-cutting device comprises the pole piece die-cutting dust removal mechanism according to any one of claims 1 to 10.

12. A thermal composite device, characterized in that, The thermal composite equipment includes the pole piece die-cutting device and the thermal composite device according to claim 11, wherein the pole piece die-cutting device is configured to cut to form a plurality of continuous pole piece units, and the thermal composite device is configured to hot-roll the pole piece unit and the diaphragm to form a thermal composite pole piece assembly.

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