Cutting apparatus for composite electrode sheets and battery production line

Abstract

A cutting apparatus for composite electrode sheets and a battery production line, belonging to the technical field of processing apparatuses. The cutting apparatus for composite electrode sheets comprises: a rack; a compounding mechanism, which is mounted on the rack and is configured to cooperate with an adsorption mechanism to compound a separator and an electrode sheet to obtain a composite electrode sheet; the adsorption mechanism, which is mounted on the rack and is configured to adsorb the composite electrode sheet; and a cutting mechanism, which is mounted on the rack and is configured to cooperate with the adsorption mechanism to cut off the composite electrode sheet.

Description

Composite electrode cutting equipment and battery production line

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202410116363.5 and application date of January 26, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of processing equipment, and more specifically, to a composite pole piece cutting device and a battery production line. Background Art

[0004] In the related art, the battery cell consists of an electrode and a diaphragm. When processing the battery cell, it is necessary to use a composite equipment to combine the electrode and the diaphragm to form a composite electrode, and use a cutting device to cut the composite electrode. This method has a complicated process and requires adding a traction mechanism for the composite electrode between the two devices. In addition, the current composite equipment and cutting equipment are large in overall size, occupy a large space, and have a large number of parts, resulting in high production costs.

[0005] Summary of the Invention

[0006] The present application provides a composite electrode cutting device and a battery production line to simultaneously realize the functions of compounding and cutting, without the need to transfer the composite electrode, which can improve production efficiency. The cutting device has a simple structure, and the integrated compounding mechanism, adsorption mechanism and cutting mechanism can reduce the number of parts, thereby reducing the overall volume of the cutting device and reducing production costs.

[0007] In a first aspect, an embodiment of the present application provides a composite electrode cutting device, comprising:

[0008] frame;

[0009] A composite mechanism, mounted on the frame, for cooperating with the adsorption mechanism to composite the diaphragm and the electrode to obtain a composite electrode;

[0010] The adsorption mechanism is installed on the frame and is used to adsorb the composite electrode;

[0011] A cutting mechanism is installed on the frame and is used to cooperate with the adsorption mechanism to cut off the composite electrode.

[0012] According to the cutting equipment for composite electrodes provided in the embodiment of the present application, the composite mechanism, adsorption mechanism and cutting mechanism are integrated into one frame, so that the functions of composite and cutting can be realized at the same time. There is no need to transfer the composite electrodes, which can improve production efficiency. The structure of the cutting equipment is simple, and the integrated composite mechanism, adsorption mechanism and cutting mechanism can reduce the number of parts, thereby reducing the overall volume of the cutting equipment and reducing production costs.

[0013] In the above technical solution, the composite mechanism and the cutting mechanism are respectively located on opposite sides of the adsorption mechanism.

[0014] In the above technical solution, the adsorption mechanism includes:

[0015] A vacuum roller is rotatably mounted on the frame.

[0016] In the above technical solution, the vacuum roller includes:

[0017] a first transmission shaft rotatably mounted on the frame;

[0018] a sleeve, the sleeve being mounted on the first transmission shaft, the sleeve forming a negative pressure chamber and having a through hole communicating with the negative pressure chamber;

[0019] A baffle is mounted on the first transmission shaft and is located at an end of the sleeve.

[0020] In the above technical solution, the baffle is provided with vacuum breaking holes respectively communicating with the negative pressure chamber and the external environment.

[0021] In the above technical solution, an inwardly recessed groove is provided at one end of the baffle away from the sleeve, and the vacuum breaking hole is provided on the bottom wall of the groove.

[0022] In the above technical solution, the angle α in the circumferential direction of the area where the vacuum breaking hole communicates with the negative pressure chamber satisfies the following: 30°≤α≤80°.

[0023] In the above technical solution, the sleeve is rotatably connected to the baffle.

[0024] In the above technical solution, the composite structure includes:

[0025] a thermal composite roller, the thermal composite roller being pivotally mounted on the frame;

[0026] The first driving mechanism is used to drive the hot composite roller to move toward the adsorption mechanism.

[0027] In the above technical solution, the composite structure further includes:

[0028] The bracket is pivotally mounted on the frame, the hot composite roller is rotatably mounted on the bracket, and the pivot axis of the bracket is parallel and spaced apart from the rotation axis of the hot composite roller, and the first driving mechanism is connected to the bracket for driving the bracket to rotate.

[0029] In the above technical solution, the cutting mechanism includes:

[0030] a second transmission shaft, the second transmission shaft being rotatably mounted on the frame;

[0031] a cutter, the cutter being mounted on the second transmission shaft;

[0032] A second driving mechanism is connected to the second transmission shaft and is used to drive the second transmission shaft to rotate.

[0033] The above technical solution also includes:

[0034] A heater is installed in the cutter.

[0035] In the above technical solution, the cutter has a working surface and avoidance surfaces located on both sides of the working surface. When the cutter moves to stop the composite electrode on the composite mechanism, the working surface presses the composite electrode.

[0036] In the above technical solution, the frame includes two supporting plates arranged opposite to each other and a supporting rod connected between the two supporting plates, and the composite mechanism, the adsorption mechanism and the cutting mechanism are all supported on the supporting plates.

[0037] In a second aspect, the present application provides a battery production line, the battery production line comprising:

[0038] A cutting device for a composite electrode as described in any one of the above;

[0039] A conveying device is used to transport the electrode piece and the diaphragm to the cutting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0041] FIG1 is a schematic structural diagram of a composite electrode cutting device provided in some embodiments of the present application;

[0042] FIG2 is a schematic structural diagram of an adsorption mechanism of a composite electrode cutting device provided in some embodiments of the present application;

[0043] FIG3 is a schematic structural diagram of a composite mechanism of a composite electrode cutting device provided in some embodiments of the present application;

[0044] FIG4 is a schematic structural diagram of a cutting mechanism of a composite electrode cutting device provided in some embodiments of the present application;

[0045] FIG5 is a schematic cross-sectional view of a flattened composite electrode provided in some embodiments of the present application;

[0046] FIG6 is a schematic plan view of a flattened composite pole piece provided in some embodiments of the present application.

[0047] Figure numerals: Cutting device 10, frame 11, support plate 111, support rod 112; Composite mechanism 12, hot composite roller 121, heating rod 1211, first temperature sensor 1212, bracket 122, third transmission shaft 123; Adsorption mechanism 13, vacuum roller 131, sleeve 1311, through hole 13111, baffle 1312, groove 13121, vacuum breaking hole 13122, first transmission shaft 1313; Cutting mechanism 14, second transmission shaft 141, cutter 142, working surface 1421, avoidance surface 1422, heater 1423, second temperature sensor 1424; Composite electrode 20, first electrode 21, second electrode 22, first diaphragm 23, second diaphragm 24, edge sealing 25. DETAILED DESCRIPTION

[0048] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0050] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0052] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0053] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0055] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0056] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0057] Based on the above, it can be understood that the process of producing batteries on a battery production line is generally to produce battery cells, connect multiple battery cells in series or in parallel to form a battery module, and then assemble the battery module with structures such as a box into a battery. Among them, the process of manufacturing battery cells by battery production equipment generally includes front-end process, middle-end process and back-end process. Among them, the front-end process is used to make and process the positive and negative electrode sheets, and the main process flows involved are stirring, coating, slitting, etc.; the middle-end process is used to complete the molding of the battery cells, and the main process flows involved are winding (or stacking), pre-pressing, assembly, injection, sealing, etc.; the back-end process is used to activate the formed battery cells, and the main process flows involved are standing, formation, capacity separation, packaging and inspection, etc.

[0058] In the above process, each process is completed by corresponding equipment. For example, slitting is completed by cutting equipment. Conveying equipment is also provided between some processes to realize material transmission. For example, conveying equipment is provided upstream of the cutting equipment to transport the electrode and diaphragm to the cutting equipment.

[0059] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0060] The cutting equipment for composite pole pieces disclosed in the embodiment of the present application can be applied to a battery production line, which is used to produce and manufacture batteries. It is understandable that the battery can be used as a power source for electrical devices such as mobile phones, tablets, laptops, electric vehicles, electric toys, electric tools, etc., to provide electrical energy to the electrical devices. Among them, the battery can specifically include a casing and a battery cell contained in the casing. The battery cell is the smallest unit of the battery and can realize the conversion of electrical energy and chemical energy. Here, the battery cell should be understood in a broad sense, that is, the battery cell can be a secondary battery or a primary battery, or it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to this. The battery cell can be cylindrical, rectangular or other shapes.

[0061] The inventors found that in the related art, the battery cell consists of an electrode and a diaphragm. When processing the battery cell, it is necessary to use a composite equipment to combine the electrode and the diaphragm to form a composite electrode, and use a cutting equipment to cut the composite electrode. This method has a complicated process and requires adding a traction mechanism for the composite electrode between the two devices. In addition, the current composite equipment and cutting equipment are large in overall size, occupy a large space, and have a large number of parts, resulting in high production costs.

[0062] Based on the above considerations, and to address the issues of large size and high production costs associated with composite and cutting equipment, the inventors, after in-depth research, have designed a composite electrode sheet cutting device, comprising a frame, a composite mechanism, an adsorption mechanism, and a cutting mechanism. The composite mechanism is mounted on the frame and cooperates with the adsorption mechanism to composite the diaphragm and electrode sheet to form a composite electrode sheet. The adsorption mechanism is mounted on the frame and is used to adsorb the composite electrode sheet. The cutting mechanism is mounted on the frame and is used to cooperate with the adsorption mechanism to cut the composite electrode sheet.

[0063] In the cutting equipment of the composite electrode of this structure, by integrating the compounding mechanism and the cutting mechanism on a frame, this structure can be used to compound the electrode and the diaphragm into a composite electrode on the adsorption mechanism using the compounding mechanism, and then continue to cut the composite electrode on the adsorption mechanism. The overall equipment structure is simple, and the number of equipment parts during the compounding and cutting of the electrode and diaphragm is reduced, thereby reducing the space occupied by the cutting equipment and reducing production costs.

[0064] Cutting equipment is used in battery production lines. The diaphragm and electrode are transported to the cutting equipment, and the diaphragm and electrode are compounded and cut by the cutting equipment to form a single composite electrode. Multiple composite electrode sheets are then stacked and packaged to form battery cells. Finally, a specified number of battery cells are packaged according to demand to form a battery.

[0065] According to some embodiments of the present application, as shown in Figures 1 to 4, the embodiments of the present application provide a cutting device 10 for a composite pole piece 20, which includes a frame 11, a composite mechanism 12, an adsorption mechanism 13 and a cutting mechanism 14.

[0066] As shown in FIG1 , the composite mechanism 12 is installed on the frame 11 and is used to cooperate with the adsorption mechanism 13 to composite the diaphragm and the electrode to obtain a composite electrode 20 .

[0067] As shown in FIG1 , the composite structure 12 can fix the diaphragm and the electrode piece by a pressing process to obtain a composite electrode piece 20 . The “pressing process” can be, for example, a direct pressing process, a rolling process, or the like.

[0068] As shown in FIG. 1 , the adsorption mechanism 13 is installed on the frame 11 and is used to adsorb the composite electrode 20 .

[0069] As shown in FIG. 1 , the cutting mechanism 14 is installed on the frame 11 and is used to cooperate with the adsorption mechanism 13 to cut off the composite electrode 20 .

[0070] During the actual execution process, the stacked diaphragm and electrode are adsorbed on the outer surface of the adsorption mechanism 13, and the diaphragm and electrode are flattened and driven to move by external equipment. When the diaphragm and electrode move to the corresponding position of the composite mechanism 12 on the adsorption mechanism 13, the composite mechanism 12 approaches the adsorption mechanism 13 and squeezes the corresponding position of the diaphragm and electrode according to the actual composite requirements of the composite electrode 20 to obtain the required composite electrode 20; the composite electrode 20 moves toward the direction close to the cutting device 10 under the drive of the external equipment. When the composite electrode 20 moves to the corresponding position of the cutting mechanism 14 on the adsorption mechanism 13, the cutting mechanism 14 approaches the adsorption mechanism 13 and cooperates with the adsorption mechanism 13 to cut off the composite electrode 20, thereby obtaining a separate composite electrode 20 of the required length.

[0071] By integrating the composite mechanism 12, the adsorption mechanism 13 and the cutting mechanism 14 on a frame 11, the cutting operation of the composite electrode 20 can be performed after the composite of the diaphragm and the electrode is completed. That is, the cutting device 10 of the composite electrode 20 can simultaneously realize the functions of composite and cutting, without the need to transfer the composite electrode 20, which can improve production efficiency, and the structure of the cutting device 10 is simple. The integrated composite mechanism 12, adsorption mechanism 13 and cutting mechanism 14 can reduce the number of parts, thereby reducing the overall volume of the cutting device 10 and reducing production costs.

[0072] According to the cutting device 10 of the composite electrode 20 provided in the embodiment of the present application, the composite mechanism 12, the adsorption mechanism 13 and the cutting mechanism 14 are integrated into a frame 11, so that the functions of composite and cutting can be realized at the same time. There is no need to transfer the composite electrode 20, which can improve production efficiency. In addition, the structure of the cutting device 10 is simple, and the integrated composite mechanism 12, the adsorption mechanism 13 and the cutting mechanism 14 can reduce the number of parts, thereby reducing the overall volume of the cutting device 10 and reducing production costs.

[0073] In some embodiments, the frame 11 includes two supporting plates 111 disposed opposite to each other and a supporting rod 112 connected between the two supporting plates 111 . The compounding mechanism 12 , the adsorption mechanism 13 and the cutting mechanism 14 are all supported on the supporting plates 111 .

[0074] As shown in FIG1 , the frame 11 may include a support plate 111 and a support rod 112 . The support plate 111 may be a trapezoidal structure, a triangular structure or other shaped structures. For example, as shown in FIG1 , the support plate 111 is a rectangular structure.

[0075] As shown in Figure 1, there can be two support plates 111 and two support rods 112. The two support plates 111 can be parallel and arranged spaced apart along the width direction of the support plates 111. The two support rods 112 are connected between the two support plates 111, and the two support rods 112 are arranged spaced apart along the length direction of the support plates 111.

[0076] The support rod 112 can be connected to the upper end between the two support plates 111 , or to the middle position or other position between the two support plates 111 . For example, as shown in FIG. 1 , the support rod 112 is connected to the upper end between the two support plates 111 .

[0077] In other embodiments, the rack 11 may also include other numbers of support plates 111 and support rods 112, or may include support plates 111 in a door-shaped structure, or may be configured in other structures.

[0078] The composite mechanism 12 is installed between the two support plates 111, and the adsorption mechanism 13 and the cutting mechanism 14 are also installed between the two support plates 111. The composite mechanism 12, the adsorption mechanism 13 and the cutting mechanism 14 are all located below the support rod 112 to reduce the probability that the support rod 112 affects the operation of the composite mechanism 12, the adsorption mechanism 13 and the cutting mechanism 14.

[0079] By using two support plates 111 to support the adsorption mechanism 13, the composite mechanism 12 and the cutting mechanism 14, the stability of the adsorption mechanism 13, the composite mechanism 12 and the cutting mechanism 14 during operation can be improved. By using the support rod 112 connected between the two support plates 111, the overall stability of the frame 11 can be improved, and the stability of the adsorption mechanism 13, the composite mechanism 12 and the cutting mechanism 14 during operation can be further improved.

[0080] In some embodiments, as shown in FIG. 1 , the compounding mechanism 12 and the cutting mechanism 14 are respectively located on opposite sides of the adsorption mechanism 13 .

[0081] 1 , the cutting mechanism 14 , the adsorption mechanism 13 and the compound mechanism 12 may be spaced apart from each other in sequence from top to bottom along the height direction of the frame 11 , that is, the cutting mechanism 14 and the compound mechanism 12 are located on the upper and lower sides of the adsorption mechanism 13 , respectively.

[0082] In other embodiments, the cutting mechanism 14 and the compounding mechanism 12 may also be located at the front and rear sides of the adsorption mechanism 13, or at the sides of the adsorption mechanism 13 in other directions.

[0083] During the actual execution process, one end of the first diaphragm 23, the first electrode piece 21, the second diaphragm 24 and the second electrode piece 22 in the length direction enters between the adsorption mechanism 13 and the composite mechanism 12 from the front side or the rear side of the adsorption mechanism 13, and is adsorbed onto the outer surface of the adsorption mechanism 13. After being compounded by the composite mechanism 12, a composite electrode piece 20 is formed. The composite electrode piece 20 continues to move toward the upper side of the adsorption mechanism 13 and is located between the adsorption mechanism 13 and the cutting mechanism 14. After being cut by the cutting mechanism 14, the composite electrode piece 20 escapes from the direction of entering the cutting device 10.

[0084] By arranging the composite mechanism 12 and the cutting mechanism 14 to be located on opposite sides of the adsorption mechanism 13 respectively, the distance between the composite mechanism 12 and the cutting mechanism 14 can be increased, thereby reducing the probability that the electrode and the diaphragm are cut off by the cutting mechanism 14 before the composite is completed due to the two mechanisms being too close.

[0085] In some embodiments, as shown in FIG2 , FIG2 is a structural schematic diagram of the adsorption mechanism 13 of the cutting device 10 for the composite electrode 20 provided in some embodiments of the present application. The adsorption mechanism 13 includes a vacuum roller 131 rotatably mounted on the frame 11 .

[0086] As shown in Figure 2, the two ends of the vacuum roller 131 are rotatably mounted on the two support plates 111, and a negative pressure cavity is formed inside the vacuum roller 131. The vacuum roller 131 can be connected to an air pump. The air pump draws air into the negative pressure cavity of the vacuum roller 131 to be in a negative pressure state, so that the diaphragm and the electrode can be adsorbed to the surface of the vacuum roller 131.

[0087] Since the diaphragm and the electrode piece are adsorbed on the surface of the vacuum roller 131, and the vacuum roller 131 is rotatably mounted on the frame 11, when the diaphragm and the electrode piece tend to move relative to the surface of the vacuum roller 131 under the push of external equipment, the diaphragm and the electrode piece will drive the vacuum roller 131 to rotate together, thereby utilizing the rotation of the vacuum roller 131 to further drive the diaphragm and the electrode piece to rotate around the vacuum roller 131.

[0088] The end of the vacuum roller 131 can also be connected to the output end of a motor or other driving mechanism, and the driving mechanism drives the vacuum roller 131 to rotate, thereby utilizing the rotation of the vacuum roller 131 to drive the diaphragm and the electrode to rotate around the vacuum roller 131.

[0089] By utilizing the vacuum roller 131 to adsorb the diaphragm and the electrode, the structure is simple and the adsorption method is convenient, which can reduce the production cost to a certain extent. At the same time, the vacuum roller 131 is set to be rotatably mounted on the frame 11, which can facilitate the rotation of the diaphragm and the electrode around the vacuum roller 131, reducing the probability that the diaphragm and the electrode are difficult to move due to the large friction between the diaphragm and the electrode and the surface of the vacuum roller 131 during adsorption, and improving production efficiency.

[0090] In some embodiments, as shown in FIG. 2 , the vacuum roller 131 includes a first transmission shaft 1313 , a sleeve 1311 , and a baffle 1312 .

[0091] As shown in Figure 2, the first transmission shaft 1313 is rotatably mounted on the frame 11, and first mounting holes are provided at corresponding positions on the two support plates 111 of the frame 11. The two ends of the first transmission shaft 1313 are respectively installed in the two first mounting holes, and bearings can be provided between the first transmission shaft 1313 and the first mounting holes to facilitate the rotation of the first transmission shaft 1313.

[0092] As shown in FIG. 2 , the sleeve 1311 is installed on the first transmission shaft 1313 . The sleeve 1311 is installed on the middle portion of the first transmission shaft 1313 , and the sleeve 1311 is located between the two support plates 111 .

[0093] As shown in Figure 2, the sleeve 1311 forms a negative pressure chamber and is provided with a through hole 13111 connected to the negative pressure chamber. The interior of the sleeve 1311 is a hollow structure, and the end of the sleeve 1311 is open. The baffle 1312 is installed on the first transmission shaft 1313 and is located at the end of the sleeve 1311. The end face of the baffle 1312 facing the sleeve 1311 is fitted with the end face of the sleeve 1311 facing the baffle 1312, that is, the sleeve 1311 and the baffles 1312 at both ends jointly form a negative pressure chamber.

[0094] As shown in Figure 2, the wall of the sleeve 1311 is provided with a plurality of through holes 13111, and the two ends of the through holes 13111 are respectively connected to the external environment and the negative pressure chamber. The plurality of through holes 13111 can be evenly distributed on the wall of the sleeve 1311 along the circumference to improve the adsorption capacity of the diaphragm and the electrode at various positions of the sleeve 1311. The plurality of through holes 13111 can also be unevenly distributed on the wall of the sleeve 1311 along the circumference.

[0095] During the actual implementation process, the negative pressure chamber formed by the sleeve 1311 and the baffle 1312 is connected to the air pump. When the cutting device 10 is working, the air pump draws air from the negative pressure chamber to make the negative pressure chamber in a negative pressure state. At this time, the negative pressure chamber absorbs air to the external environment through the through hole 13111, that is, the diaphragm and the electrode can be adsorbed on the outer surface of the sleeve 1311 through the air absorption of the through hole 13111.

[0096] By utilizing the sleeve 1311 and the baffle 1312 to form a negative pressure chamber, the structure is simple and the adsorption force is strong, which can improve the stability of the adsorption mechanism 13 in adsorbing the diaphragm and the electrode. The sleeve 1311 and the baffle 1312 are supported by the first transmission shaft 1313, and the support is stable, which can reduce the probability of the first transmission shaft 1313 shaking during operation, resulting in unqualified compounding or cutting of the diaphragm and the electrode.

[0097] In some embodiments, as shown in FIG2 , the baffle 1312 is provided with vacuum-breaking holes 13122 that are in communication with the negative pressure chamber and the external environment, respectively.

[0098] As shown in Figure 2, the vacuum breaking hole 13122 can extend along the axial direction of the first transmission shaft 1313 on the baffle 1312, that is, the vacuum breaking hole 13122 passes through the two end surfaces of the baffle 1312, and the vacuum breaking hole 13122 can also be bent or have other shape structures on the baffle 1312.

[0099] Since the vacuum breaking hole 13122 and the through hole 13111 located in the negative pressure chamber area corresponding to the vacuum breaking hole 13122 are both connected to the negative pressure chamber, when the air pump draws air into the negative pressure chamber, the air in the external environment can be sucked into the negative pressure chamber from the vacuum breaking hole 13122 and the through hole 13111 at the same time. At this time, the gas sucked in by the through hole 13111 located in the negative pressure chamber area corresponding to the vacuum breaking hole 13122 is less than that of the through holes 13111 in other areas, that is, the adsorption force of the through hole 13111 corresponding to the vacuum breaking hole 13122 is smaller than that of the other through holes 13111.

[0100] In the actual implementation process, when the diaphragm and the electrode piece enter the cutting device 10, the diaphragm and the electrode piece are located in the area on the sleeve 1311 that does not correspond to the vacuum breaking hole 13122, and are adsorbed on the outer surface of the sleeve 1311 through the suction of the through hole 13111; when the diaphragm and the electrode piece complete the compounding and cutting operations, when the end of the composite electrode piece 20 in the length direction rotates around the sleeve 1311 to the through hole 13111 corresponding to the vacuum breaking hole 13122, under the action of the vacuum breaking hole 13122, the adsorption force of the through hole 13111 at this location is reduced. , it is difficult to stably adsorb the composite electrode 20 on the outer surface of the sleeve 1311. At this time, the end of the composite electrode 20 is separated from the outer surface of the sleeve 1311 under the action of the rebound force, and protrudes outward relative to the outer surface of the sleeve 1311. The other positions of the composite electrode 20 are also separated from the outer surface of the sleeve 1311 when passing through the sleeve 1311 area corresponding to the vacuum breaking hole 13122. After the entire composite electrode 20 is separated from the outer surface of the sleeve 1311, the composite electrode 20 falls into the subsequent equipment for the next step of operation.

[0101] By setting a vacuum breaking hole 13122 on the baffle 1312, the separation between the composite pole piece 20 and the sleeve 1311 can be achieved, reducing the multiple recombination and cutting of the composite pole piece 20 due to the composite pole piece 20 not being separated from the sleeve 1311. The structure is simple and no additional components are required, thereby further reducing production costs.

[0102] In some embodiments, as shown in FIG. 2 , an inwardly recessed groove 13121 is provided at one end of the baffle 1312 facing away from the sleeve 1311 , and a vacuum breaking hole 13122 is provided on the bottom wall of the groove 13121 .

[0103] There may be multiple vacuum breaking holes 13122 or one vacuum breaking hole 13122 . For example, as shown in FIG. 2 , there are multiple vacuum breaking holes 13122 , and the multiple vacuum breaking holes 13122 are spaced apart and distributed along the length direction of the bottom wall of the groove 13121 .

[0104] In other embodiments, the baffle 1312 is not provided with the groove 13121 , and the vacuum breaking holes 13122 may pass through both ends of the baffle 1312 along the axial direction, and the negative pressure chamber of the sleeve 1311 is connected to the external environment through the vacuum breaking holes 13122 .

[0105] In some other embodiments, the baffle 1312 may be provided with a notch, and the negative pressure chamber of the sleeve 1311 and the area corresponding to the notch are directly connected to the external environment through the notch.

[0106] By setting the vacuum breaking hole 13122 on the bottom wall of the groove 13121, compared with setting a notch on the baffle 1312, the area of ​​the negative pressure chamber of the sleeve 1311 connected to the external environment can be reduced, and the probability of affecting the adsorption force at other positions in the negative pressure chamber due to the large vacuum breaking area is reduced. Compared with setting the vacuum breaking hole 13122 on the baffle 1312 to pass through both ends of the baffle 1312, the axial length of the vacuum breaking hole 13122 can be shortened, that is, the length of the airway can be shortened, thereby reducing the noise generated by the vacuum breaking hole 13122 when the air pump is pumping air.

[0107] In some embodiments, as shown in FIG2 , the angle α of the area where the vacuum breaking hole 13122 communicates with the negative pressure chamber in the circumferential direction satisfies: 30°≤α≤80°.

[0108] Among them, the baffle 1312 can be a rectangular structure, a triangular structure or other shape structures. For example, as shown in Figure 2, the baffle 1312 is a circular ring structure. The baffle 1312 is installed on the first transmission shaft 1313 through the internal hole. The outer diameter of the baffle 1312 can be the same as the outer diameter of the sleeve 1311, or it can be larger than the outer diameter of the sleeve 1311.

[0109] As shown in FIG. 2 , the groove 13121 extends along the circumference of the baffle 1312 , that is, the groove 13121 is an arc-shaped structure, and the center of curvature of the groove 13121 may or may not coincide with the center of the baffle 1312 .

[0110] The vacuum breaking hole 13122 can be an arc-shaped long strip hole or a circular hole. For example, as shown in Figure 2, the vacuum breaking hole 13122 is a circular hole, and multiple vacuum breaking holes 13122 are evenly distributed on the bottom wall of the groove 13121 along the circumferential direction, that is, multiple vacuum breaking holes 13122 form an arc structure, and the center of curvature of the arc structure formed by multiple vacuum breaking holes 13122 can coincide with the center of the baffle 1312, or may not coincide with the center of the baffle 1312. The angle between the two outermost vacuum breaking holes 13122 in the circumferential direction is α, that is, the circumferential angle of the negative pressure chamber area connected to the vacuum breaking hole 13122 is α.

[0111] As shown in FIG2 , the value range of α is [30°, 80°]. The specific value of α can be 30°, 45°, 50°, 55°, 60°, 70°, 80° or other values ​​between 30° and 80°, which are not specifically limited here.

[0112] By setting the circumferential angle α of the area connecting the vacuum breaking hole 13122 and the negative pressure chamber to satisfy 30°≤α≤80°, the probability of poor adsorption effect on the electrode and the diaphragm due to the vacuum breaking area being too large can be reduced. At the same time, the probability of difficulty in separating the electrode and the diaphragm from the sleeve 1311 due to the vacuum breaking area being too small can be reduced.

[0113] In some embodiments, as shown in FIG. 2 , the sleeve 1311 is rotatably connected to the baffle 1312 .

[0114] Among them, the first transmission shaft 1313 is rotatably connected to the baffle 1312, the baffle 1312 is sleeved on the outer periphery of the first transmission shaft 1313, and a bearing can be set between the baffle 1312 and the first transmission shaft 1313. Since the sleeve 1311 is installed on the first transmission shaft 1313, the sleeve 1311 is rotatably connected to the baffle 1312.

[0115] During the actual implementation process, after the ends of the electrode and the diaphragm pass through the composite mechanism 12 and the cutting mechanism 14, they continue to rotate together with the sleeve 1311. When the end of the composite electrode 20 rotates to the position corresponding to the vacuum breaking hole 13122, the end of the composite electrode 20 is separated from the sleeve 1311, and the other parts of the composite electrode 20 are gradually separated from the sleeve 1311 at the position corresponding to the vacuum breaking hole 13122, until the composite electrode 20 as a whole is separated from the sleeve 1311. Since the sleeve 1311 is rotatably connected to the baffle 1312, when the sleeve 1311 rotates, the baffle 1312 remains stationary, and each position on the composite electrode 20 is separated from the sleeve 1311 at the same position of the baffle 1312.

[0116] In other embodiments, the sleeve 1311 and the baffle 1312 can also be fixedly connected, and the rotational speed of the composite pole piece 20 can be set to be greater than or less than the rotational speed of the sleeve 1311. The rotational speed difference between the composite pole piece 20 and the sleeve 1311 can realize the correspondence between the vacuum breaking areas of the composite pole piece 20 and the sleeve 1311.

[0117] By arranging the sleeve 1311 to be rotatably connected to the baffle 1312 , various positions of the composite electrode 20 can be separated from the sleeve 1311 at a fixed position of the cutting device 10 , so as to facilitate the position setting of subsequent devices.

[0118] In some embodiments, as shown in FIG3 , the laminating mechanism 12 includes a hot laminating roller 121 and a first driving mechanism.

[0119] As shown in Figure 3, the hot composite roller 121 can be pivotally mounted on the frame 11, and a heating rod 1211 and a first temperature sensor 1212 can be provided inside the hot composite roller 121. The heating rod 1211 is used to heat the hot composite roller 121, and the first temperature sensor 1212 is used to collect the temperature of the hot composite roller 121 and control the heating power of the heating rod 1211 according to the collected temperature. For example, if the temperature of the hot composite roller 121 is low, the heating power of the heating rod 1211 is controlled to increase; if the temperature of the hot composite roller 121 is high, the heating power of the heating rod 1211 is controlled to decrease.

[0120] The temperature of the heated hot composite roller 121 can be between 65°C and 125°C. The temperature of the hot composite roller 121 can be specifically 65°C, 75°C, 80°C, 90°C, 100°C, 110°C, 125°C or other values ​​between 65°C and 125°C, which is not specifically limited here.

[0121] By setting the temperature of the heated hot composite roller 121 to between 65°C and 125°C, the probability of damage to the diaphragm and electrode due to excessive melting caused by the hot composite roller 121 being too high in temperature can be reduced, and the probability of poor composite effect caused by the hot composite roller 121 being too low in temperature can be reduced.

[0122] When the hot composite roller 121 composites the electrode 20 and the diaphragm, the hot composite roller 121 melts the diaphragm through a certain temperature, and composites the diaphragm and the electrode through a certain pressure. The pressure applied to the diaphragm and the electrode by the hot composite roller 121 can be between 0.25MPa and 0.8MPa. The specific value can be 0.25MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa or other values ​​between 0.25MPa and 0.8MPa, which are not specifically limited here.

[0123] By setting the pressure applied by the hot composite roller 121 to the diaphragm and the electrode to between 0.25MPa and 0.8MPa, the probability of damage to the adsorption mechanism 13 due to excessive pressure applied by the hot composite roller 121 can be reduced, and the probability of poor composite effect due to insufficient pressure applied by the hot composite roller 121 can be reduced.

[0124] The first driving mechanism is used to drive the hot composite roller 121 to move toward the adsorption mechanism 13 . The first driving mechanism may be a motor, a cylinder plus a ball screw mechanism, or other driving mechanisms.

[0125] During the actual implementation process, when the electrode and the diaphragm are adsorbed on the adsorption mechanism 13, and the electrode and the diaphragm rotate to the position corresponding to the hot composite roller 121, the first driving mechanism drives the hot composite roller 121 to move in the direction close to the adsorption mechanism 13, so that the hot composite roller 121 contacts the adsorption mechanism 13, and the two generate a certain force when in contact. Therefore, when the diaphragm and the electrode are located between the hot composite roller 121 and the adsorption mechanism 13, the hot composite roller 121 composites the diaphragm and the electrode through a certain temperature and a certain pressure. Since the hot composite roller 121 can be pivotally mounted on the frame 11, the contact position of the hot composite roller 121 and the sleeve 1311 can be maintained in a fixed position of the cutting device 10; when the electrode and the diaphragm are composited, the first driving mechanism drives the hot composite roller 121 to move in the direction away from the adsorption mechanism 13, so that the composite electrode 20 can continue to rotate on the adsorption mechanism 13.

[0126] By setting up the above-mentioned hot composite roller 121 and the first driving mechanism, the electrode 20 and the diaphragm are composited by means of heating composite, which can improve the composite efficiency and composite effect of the electrode and the diaphragm. The hot composite roller 121 is driven by the first driving mechanism to move toward the adsorption mechanism 13 or in a direction away from the adsorption mechanism 13, which can improve the composite effect of the hot composite roller 121 on the electrode and the diaphragm while reducing the probability that the hot composite roller 121 affects the rotation of the composite electrode 20.

[0127] In some embodiments, as shown in Figure 3, the composite mechanism 12 also includes a bracket 122, which is pivotally mounted on the frame 11, and the hot composite roller 121 is rotatably mounted on the bracket 122, and the pivot axis of the bracket 122 is parallel to and spaced from the rotation axis of the hot composite roller 121, and the first driving mechanism is connected to the bracket 122 for driving the bracket 122 to rotate.

[0128] The bracket 122 may be a rectangular structure, a trapezoidal structure or other shaped structures. For example, as shown in FIG. 3 , the bracket 122 may be a C-shaped structure, and the hot composite roller 121 is installed inside the bracket 122 .

[0129] As shown in Figure 3, the composite mechanism 12 can also include a third transmission shaft 123, which is rotatably connected to the frame 11, and the third transmission shaft 123 is arranged parallel to the hot composite roller 121. A bearing can be arranged between the third transmission shaft 123 and the frame 11, and the bracket 122 is installed on the third transmission shaft 123, and the third transmission shaft 123 is connected to the output end of the first drive mechanism.

[0130] In actual implementation, the first driving mechanism drives the third transmission shaft 123 to rotate, and the third transmission shaft 123 drives the bracket 122 and the heat composite roller 121 to rotate around the third transmission shaft 123 as a whole, and the heat composite roller 121 can rotate around its own axis on the bracket 122.

[0131] By arranging the pivot axis of the bracket 122 and the rotation axis of the heat composite roller 121 to be parallel and spaced apart, the heat composite roller 121 can move toward or away from the adsorption mechanism 13, with a simple structure and easy operation.

[0132] In some embodiments, as shown in FIG. 4 , the cutting mechanism 14 includes a second transmission shaft 141 , a cutter 142 , and a second driving mechanism.

[0133] As shown in FIG. 4 , the second transmission shaft 141 is rotatably mounted on the frame 11 , and a bearing may be provided between the second transmission shaft 141 and the frame 11 to facilitate the rotation of the second transmission shaft 141 .

[0134] As shown in FIG. 4 , the cutter 142 is mounted on the second transmission shaft 141 , and the cutter 142 can rotate together with the second transmission shaft 141 around the axis of the second transmission shaft 141 .

[0135] The second driving mechanism is connected to the second transmission shaft 141 and is used to drive the second transmission shaft 141 to rotate. The second driving mechanism can be a motor or a cylinder plus a ball screw mechanism, or other driving mechanisms.

[0136] During the actual implementation process, when the part of the composite electrode 20 that needs to be cut rotates to the position corresponding to the cutting mechanism 14, the second driving mechanism drives the second transmission shaft 141 to rotate, and the second transmission shaft 141 drives the cutter 142 to rotate toward the adsorption mechanism 13, and uses the blade part of the cutter 142 to cut the composite electrode 20; after the cutter 142 cuts off the composite electrode 20, the second driving mechanism drives the second transmission shaft 141 to rotate, and the second transmission shaft 141 drives the cutter 142 to rotate in the direction away from the adsorption mechanism 13, so that the composite electrode 20 can continue to rotate on the adsorption mechanism 13.

[0137] By setting up the above-mentioned cutter 142 and the second driving mechanism, the second driving mechanism is used to drive the cutter 142 to move toward the adsorption mechanism 13 or in a direction away from the adsorption mechanism 13, thereby improving the cutting effect of the cutter 142 on the composite electrode 20 while reducing the probability of the cutter 142 affecting the rotation of the composite electrode 20.

[0138] In some embodiments, as shown in FIG4 , the cutter 142 has a working surface 1421 and avoidance surfaces 1422 located on both sides of the working surface 1421 . When the cutter 142 moves to stop the composite electrode 20 on the composite mechanism 12 , the working surface 1421 presses the composite electrode 20 .

[0139] As shown in Figure 4, the working surface 1421 and the avoidance surface 1422 can both be planes, and the avoidance surfaces 1422 located on both sides of the working surface 1421 are inclined relative to the working surface 1421 toward the second transmission shaft 141, that is, the height of the avoidance surface 1422 relative to the adsorption mechanism 13 is greater than the height of the working surface 1421 relative to the adsorption mechanism 13.

[0140] In the actual implementation process, when the second driving mechanism drives the second transmission shaft 141 to drive the cutter 142 to rotate toward the adsorption mechanism 13, the first avoidance surface 1422 first passes over the adsorption mechanism 13. Since the height of the avoidance surface 1422 is higher than the working surface 1421 and the avoidance surface 1422 is inclined toward the second transmission shaft 141, the avoidance surface 1422 contacts the adsorption mechanism 13. After the first avoidance surface 1422 passes through the adsorption mechanism 13, the working surface 1421 contacts the adsorption mechanism 13. Since the sleeve 1311 of the adsorption mechanism 13 is a cylindrical structure and the working surface 1421 is a plane, the working surface 1421 is adsorbed on the sleeve 131 1, the contact area between the working surface 1421 and the composite electrode piece 20 is a straight line, and the working surface 1421 and the adsorption mechanism 13 generate a certain force when in contact. Therefore, when the composite electrode piece 20 is located between the cutter 142 and the adsorption mechanism 13, the working surface 1421 applies a certain pressure to the composite electrode piece 20 so that the composite electrode piece 20 is squeezed and broken; when the second driving mechanism drives the second transmission shaft 141 to drive the cutter 142 to continue rotating in the direction of rotation before cutting, the working surface 1421 and the second avoidance surface 1422 pass through the adsorption mechanism 13 in sequence, and the second avoidance surface 1422 also does not contact the adsorption mechanism 13.

[0141] By setting the above-mentioned working surface 1421 and avoidance surface 1422, while achieving cutting of the composite electrode 20, the probability of damage to the cutter 142 and the adsorption mechanism 13 caused by the contact between the parts of the cutter 142 located on both sides of the working surface 1421 and the adsorption mechanism 13 is reduced.

[0142] In some embodiments, as shown in FIG. 4 , the cutting mechanism 14 further includes a heater 1423 , which is installed in the cutter 142 .

[0143] As shown in FIG4 , a heater 1423 and a second temperature sensor 1424 may be provided inside the cutter 142. The heater 1423 is used to heat the cutter 142. The second temperature sensor 1424 is used to collect the temperature of the cutter 142 and control the heating power of the heater 1423 based on the collected temperature. For example, if the temperature of the cutter 142 is low, the heating power of the heater 1423 is controlled to increase; if the temperature of the cutter 142 is high, the heating power of the heater 1423 is controlled to decrease.

[0144] The temperature of the heated cutter 142 can be between 65°C and 125°C. The temperature of the cutter 142 can specifically be 65°C, 75°C, 80°C, 90°C, 100°C, 110°C, 125°C or other values ​​between 65°C and 125°C, which are not specifically limited here.

[0145] By setting the temperature of the heated cutter 142 to between 65°C and 125°C, the probability of damage to the composite electrode 20 due to excessive melting of the cutter 142 due to excessively high temperature can be reduced, and the probability of poor cutting effect due to excessively low temperature of the cutter 142 can be reduced.

[0146] When the cutter 142 cuts off the composite electrode 20, the cutter 142 melts the composite electrode 20 through a certain temperature and cuts off the composite electrode 20 through a certain pressure. The pressure applied by the cutter 142 to the composite electrode 20 can be between 0.25MPa-0.8MPa, and the specific value can be 0.25MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa or other values ​​between 0.25MPa-0.8MPa, which are not specifically limited here.

[0147] By setting the pressure applied by the cutter 142 to the composite electrode 20 to between 0.25MPa and 0.8MPa, the probability of damage to the adsorption mechanism 13 due to excessive pressure applied by the cutter 142 can be reduced, and the probability of poor cutting effect due to insufficient pressure applied by the cutter 142 can be reduced.

[0148] During the actual implementation process, when the cutter 142 cuts the composite electrode 20, the high temperature of the cutter 142 itself melts the position of the composite electrode 20 that needs to be cut, and then a certain pressure is applied to the composite electrode 20 by the cutter 142 to squeeze and cut the position of the composite electrode 20 that needs to be cut.

[0149] By setting the above-mentioned heater 1423, the cutter 142 can melt the position where the composite electrode 20 needs to be cut when cutting the composite electrode 20, thereby facilitating the cutter 142 to cut the composite electrode 20 and reducing the pressure that the cutter 142 needs to apply to the composite electrode 20.

[0150] According to some embodiments of the present application, as shown in Figures 1 to 4, the present application provides a cutting device 10 for a composite electrode 20, comprising a frame 11, a composite mechanism 12, an adsorption mechanism 13, and a cutting mechanism 14. The composite mechanism 12 is mounted on the frame 11, and is used to cooperate with the adsorption mechanism 13 to composite the diaphragm and the electrode to obtain the composite electrode 20; the adsorption mechanism 13 is mounted on the frame 11, and is used to adsorb the composite electrode 20; the cutting mechanism 14 is mounted on the frame 11, and is used to cooperate with the adsorption mechanism 13 to cut the composite electrode 20. The composite mechanism 12 and the cutting mechanism 14 are respectively located on opposite sides of the adsorption mechanism 13. The adsorption mechanism 13 includes a vacuum roller 131, which is rotatably mounted on the frame 11. The vacuum roller 131 includes a first transmission shaft 1313, a sleeve 1311, and a baffle 1312. A first transmission shaft 1313 is rotatably mounted on the frame 11. A sleeve 1311 is mounted on the first transmission shaft 1313. The sleeve 1311 forms a negative pressure chamber and is provided with a through hole 13111 communicating with the negative pressure chamber. A baffle 1312 is mounted on the first transmission shaft 1313 and is located at the end of the sleeve 1311. The baffle 1312 is provided with a vacuum-breaking hole 13122 communicating with the negative pressure chamber and the external environment, respectively. The end of the baffle 1312 facing away from the sleeve 1311 is provided with an inwardly recessed groove 13121. The vacuum-breaking hole 13122 is located on the bottom wall of the groove 13121. The sleeve 1311 and the baffle 1312 are rotatably connected. The laminating mechanism 12 includes a hot laminating roller 121, a first drive mechanism, and a bracket 122. The hot laminating roller 121 is pivotally mounted on the frame 11. A first drive mechanism is used to drive the hot laminating roller 121 toward the adsorption mechanism 13. A bracket 122 is pivotally mounted on the frame 11. The hot laminating roller 121 is rotatably mounted on the bracket 122, with the pivot axis of the bracket 122 parallel to and spaced from the rotation axis of the hot laminating roller 121. The first drive mechanism is connected to the bracket 122 and is used to drive the bracket 122 to rotate. The cutting mechanism 14 includes a second transmission shaft 141, a cutter 142, a second drive mechanism, and a heater 1423. The second transmission shaft 141 is rotatably mounted on the frame 11. The cutter 142 is mounted on the second transmission shaft 141. The second drive mechanism is connected to the second transmission shaft 141 and is used to drive the second transmission shaft 141 to rotate. A heater 1423 is mounted within the cutter 142. The cutter 142 has a working surface 1421 and avoidance surfaces 1422 located on both sides of the working surface 1421 . When the cutter 142 moves to stop the composite electrode 20 on the composite mechanism 12 , the working surface 1421 presses the composite electrode 20 .

[0151] The angle α of the area where the vacuum-breaking hole 13122 communicates with the negative pressure chamber in the circumferential direction satisfies the following: 30°≤α≤80°.

[0152] It should be noted that, as shown in Figures 5 and 6, the composite electrode 20 may include a first electrode 21, a second electrode 22, a first diaphragm 23 and a second diaphragm 24. The first diaphragm 23, the first electrode 21, the second diaphragm 24 and the second electrode 22 are stacked in sequence and adsorbed on the adsorption mechanism 13. The polarity of the second electrode 22 and the first electrode 21 are opposite. When the first electrode 21, the second electrode 22, the first diaphragm 23 and the second diaphragm 24 are all in the expanded state, the length of the first diaphragm 23 and the second diaphragm 24 is greater than the length of the first electrode 21 and the second electrode 22, that is, the ends of the first diaphragm 23 and the second diaphragm 24 in the electrode length direction L protrude outward relative to the electrode.

[0153] In some embodiments, the compounding mechanism 12 compounds the two ends of the first diaphragm 23 and the second diaphragm 24 in the length direction L in a one-to-one correspondence.

[0154] During the actual implementation process, the first diaphragm 23, the first electrode piece 21, the second diaphragm 24 and the second electrode piece 22 are stacked in sequence and adsorbed on the adsorption mechanism 13. When the first end of the first diaphragm 23 and the second diaphragm 24 along the length direction L passes through the composite mechanism 12, the composite mechanism 12 will be able to use cold rolling composite or knurling composite to composite the first end of the first diaphragm 23 and the second diaphragm 24 along the length direction L together; when the second end of the first diaphragm 23 and the second diaphragm 24 along the length direction L passes through the composite mechanism 12, the composite mechanism 12 will be able to use cold rolling composite or knurling composite to composite the first diaphragm 23 and the second diaphragm 24 along the length direction L together, so that the first electrode piece 21 will not exceed the edge of the first diaphragm 23 or the second diaphragm 24 in the length direction L, thereby improving the yield of the composite electrode piece 20.

[0155] In other embodiments, as shown in Figures 5 and 6, the composite structure 12 composites the two ends of the first diaphragm 23 and the second diaphragm 24 in the length direction L in a one-to-one correspondence, and the end of the first pole piece 21 in the length direction L can be composited and fixed with at least one of the first diaphragm 23 and the second diaphragm 24 to form a sealed edge 25.

[0156] During the actual implementation process, the first diaphragm 23, the first electrode 21, the second diaphragm 24 and the second electrode 22 are stacked in sequence and adsorbed on the adsorption mechanism 13. When the ends of the first diaphragm 23 and the second diaphragm 24 along the length direction L pass through the composite mechanism 12, the composite mechanism 12 composites the ends of the first diaphragm 23 and the second diaphragm 24 along the length direction L together; when the end of the first electrode 21 along the length direction L passes through the composite mechanism 12, the composite mechanism 12 can composite and fix the end of the first electrode 21 along the length direction L with at least one of the first diaphragm 23 and the second diaphragm 24 to form a sealed edge 25, so that the burr of the first electrode 21 at the length end of the first electrode 21 protruding from the electrode surface during the fixing process is reduced or covered, thereby reducing the risk of the burr piercing the diaphragm, and also making it difficult for the first electrode 21 to slip relative to the first diaphragm 23 or the second diaphragm 24.

[0157] The present application also discloses a battery production line, including: a conveying device and a composite electrode cutting device 10.

[0158] The conveying device is used to transport the electrode piece and the diaphragm to the composite electrode piece cutting device 10; the composite electrode piece cutting device 10 is the composite electrode piece cutting device 10 described in any of the above embodiments.

[0159] The battery production line of the present application can simultaneously realize the functions of compounding and cutting by designing the cutting device 10 of the above-mentioned structural form, without the need to transfer the composite electrode, which can improve production efficiency. The structure of the cutting device is simple, and the integrated compound mechanism 12, adsorption mechanism 13 and cutting mechanism 14 can reduce the number of parts, thereby reducing the overall volume of the cutting device 10 and reducing production costs.

[0160] The battery production line may also include other mechanisms, including a stacking mechanism for stacking composite pole pieces, a packaging mechanism for packaging batteries, etc.

[0161] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0162] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A cutting device for a composite electrode sheet, characterized in that, Comprising: Frame; Compound mechanism, installed on the frame, for cooperating with the adsorption mechanism to compound the separator and the electrode sheet to obtain a compound electrode sheet; The adsorption mechanism, installed on the frame, for adsorbing the compound electrode sheet; Cutting mechanism, installed on the frame, for cooperating with the adsorption mechanism to cut the compound electrode sheet.

2. The cutting device for the composite electrode sheet according to claim 1, wherein, The compound mechanism and the cutting mechanism are respectively located on opposite sides of the adsorption mechanism.

3. The cutting device for the composite pole piece according to claim 1 or 2, characterized in that, The adsorption mechanism includes: Vacuum roll, the vacuum roll is rotatably installed on the frame.

4. The cutting device for the composite electrode sheet according to claim 3, wherein, The vacuum roll includes: First transmission shaft, the first transmission shaft is rotatably installed on the frame; Sleeve, the sleeve is installed on the first transmission shaft, the sleeve forms a negative pressure chamber and is provided with a through hole communicating with the negative pressure chamber; Baffle, the baffle is installed on the first transmission shaft and is located at the end of the sleeve.

5. The cutting device for the composite electrode sheet according to claim 4, characterized in that, The baffle is provided with a vacuum-breaking hole respectively communicating with the negative pressure chamber and the external environment.

6. The cutting device for the composite electrode sheet according to claim 5, characterized in that, One end of the baffle facing away from the sleeve is provided with an inwardly recessed groove, and the vacuum-breaking hole is arranged on the bottom wall of the groove.

7. The cutting device for the composite pole piece according to claim 5 or 6, characterized in that, The angle α in the circumferential direction of the region where the vacuum-breaking hole communicates with the negative pressure chamber satisfies: 30° ≤ α ≤ 80°.

8. The cutting device for the composite electrode sheet according to any one of claims 4-7, characterized in that, The sleeve is rotatably connected to the baffle.

9. The cutting device for the composite electrode sheet according to any one of claims 1-8, characterized in that, The compound mechanism includes: Thermal compounding roll, the thermal compounding roll is pivotally installed on the frame; First driving mechanism, the first driving mechanism is used to drive the thermal compounding roll to move towards the adsorption mechanism.

10. The cutting device for the composite electrode sheet according to claim 9, characterized in that, The compound mechanism further includes: Bracket, the bracket is pivotally installed on the frame, the thermal compounding roll is rotatably installed on the bracket, and the pivot axis of the bracket is parallel and spaced apart from the rotation axis of the thermal compounding roll, and the first driving mechanism is connected to the bracket for driving the bracket to rotate.

11. The cutting device for the composite electrode sheet according to any one of claims 1-10, characterized in that, The cutting mechanism includes: Second transmission shaft, the second transmission shaft is rotatably installed on the frame; Cutting knife, the cutting knife is installed on the second transmission shaft; Second driving mechanism, the second driving mechanism is connected to the second transmission shaft for driving the second transmission shaft to rotate.

12. The cutting device for the composite electrode sheet according to claim 11, wherein, Further comprising: Heater, the heater is installed in the cutting knife.

13. The cutting device for the composite electrode sheet according to claim 11 or 12, characterized in that, The cutting knife has a working surface and relief surfaces on both sides of the working surface. When the cutting knife moves to abut against the compound electrode sheet on the compound mechanism, the working surface presses the compound electrode sheet.

14. The cutting device for the composite electrode sheet according to any one of claims 1-13, characterized in that, The frame includes two relatively arranged support plates and a support rod connected between the two support plates, and the compound mechanism, the adsorption mechanism and the cutting mechanism are all supported on the support plates.

15. A battery production line, characterized in that, Comprising: The cutting device for the compound electrode sheet according to any one of claims 1-14; Conveying device, the conveying device is used to convey the electrode sheet and the separator to the cutting device.

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