CN218069904U - Pole piece skiving device, pole piece forming equipment and pole piece - Google Patents

Abstract

The application discloses pole piece skiving device, pole piece former and pole piece. The pole piece skiving device comprises: a thinning component and a dust suction component. The thinning component is arranged on a tape running path of the pole piece and is used for stripping part of active substances of the pole piece from the pole piece. The dust absorption component is used for being opposite to the pole piece and absorbing the active substances stripped from the pole piece. According to the technical scheme, the active substances in the partial area on the pole piece can be thinned, the peeled active substances can be quickly sucked out, the stress of the corner area of the pole piece is reduced, the lithium precipitation risk of the pole piece is reduced, and the safety of the battery is improved.

Description

Pole piece skiving device, pole piece forming equipment and pole piece

Technical Field

The application relates to the field of battery manufacturing equipment, in particular to a pole piece thinning device, pole piece forming equipment and a pole piece.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like. The battery can include cadmium nickel battery, hydrogen nickel battery, lithium ion battery, secondary alkaline zinc manganese battery, etc.

The pole piece of the battery is a main component for performing electric energy conversion in the battery, and therefore, the production efficiency of the pole piece of the battery is one of the directions studied in the field.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a pole piece thinning apparatus, a pole piece forming device and a pole piece, which can thin active materials in a partial region on the pole piece, and simultaneously rapidly suck out stripped active materials, thereby reducing stress in a corner region of the pole piece, reducing a lithium precipitation risk of the pole piece, and improving safety of a battery.

In a first aspect, the present application provides a pole piece thinning apparatus, including: a thinning component and a dust suction component. The thinning component is arranged on a tape moving path of the pole piece and is used for stripping partial active substances of the pole piece from the pole piece. The dust collection component is used for being opposite to the pole piece and absorbing the active substances stripped from the pole piece.

Among the technical scheme of this application embodiment, thin the active material of pole piece subregion through setting up the component of thinning to reduce the thickness of this regional pole piece, set up the active material that the dust absorption component will peel off simultaneously and in time absorb, foretell structure can thin the pole piece rapidly, reduces the regional stress in pole piece corner, reduces the separation out of this department pole piece lithium ion simultaneously, improves the operating stability of pole piece, prolongs the cycle life of battery and promotes the security performance of battery simultaneously.

In some embodiments, the dust extraction member comprises a dust extraction hood having a pole piece inlet, a pole piece outlet, a cleaning port disposed between the pole piece inlet and the pole piece outlet for exposing the pole piece, and a dust extraction port; the thinning member includes a laser, and a laser exit port of the laser is provided toward the cleaning port. The dust hood is arranged to solve the problems that the dust amount is large during thinning, the dust cannot be cleaned in time, and the belt is broken due to accumulation; through setting up the laser instrument, improve the accuracy of the control of skiving width and skiving degree of depth, solve the pole piece when skiving, cross roller circle and beat, cutter unstability, the unable problem of guaranteeing of skiving degree of depth precision.

In some embodiments, the dust hood has an accommodating cavity, the pole piece inlet, the pole piece outlet, the cleaning opening and the dust suction opening are respectively connected with the accommodating cavity, and the dust suction component further comprises a negative pressure mechanism which is communicated with the dust suction opening. The pole piece inlet, the pole piece outlet, the cleaning port and the dust suction port are communicated through the accommodating cavity, and stripped active substances can be sucked out by the negative pressure mechanism through the accommodating cavity, so that the pole piece thinning efficiency is improved.

In some embodiments, the dust collection cover is further provided with an air inlet communicated with the accommodating cavity, the cleaning opening is arranged between the air inlet and the dust collection opening, and the dust collection component further comprises an air knife communicated with the air inlet. Through setting up air intake and dust absorption mouth cooperation, in time the active material of gettering, reduce the active material of peeling off and follow the possibility that the pole piece export leaked, further promote the cleanliness in holding the chamber.

In some embodiments, the number of the cleaning openings is two, the two cleaning openings are respectively arranged at two sides of the pole piece, and the two lasers are correspondingly arranged. Through setting up two lasers, can clear away the active material on two relative surfaces of pole piece simultaneously, improve the efficiency that the pole piece was cut thin.

In some embodiments, the two cleaning ports are staggered along both sides of the pole piece. The structure can avoid damage caused by the two lasers during opposite shooting, and the safety and the stability of production are improved.

In a second aspect, the present application provides a pole piece forming apparatus, which includes a pole piece conveying device and the pole piece thinning device in the above embodiments. The pole piece conveying device is used for conveying the pole pieces along the tape conveying path; the pole piece thinning device is arranged on a tape walking path of the pole piece. The pole piece forming equipment provided by the embodiment of the application can thin partial areas on the pole piece in the pole piece conveying process, and improves the production convenience of the pole piece.

In some embodiments, the pole piece forming apparatus further comprises: utmost point ear cutting device and position sensor. The pole lug cutting device is arranged on a tape running path of the pole piece and is positioned at the upstream of the pole piece thinning device, and the pole lug cutting device is used for cutting the edge of the pole piece to form a pole lug. The position sensor is arranged between the pole lug cutting device and the pole piece thinning device and used for sensing the tape moving position of the pole piece so as to control the starting of the pole piece thinning device. In the structure, the pole piece can be cut to form the pole lug by arranging the pole lug cutting device so as to be electrically connected with other equipment. And moreover, a position sensor is arranged to determine the thinning position of the pole piece, so that the thinning accuracy of the pole piece is improved.

In some embodiments, the pole piece forming apparatus further comprises: and the tab cutting device is arranged on the tape walking path of the pole piece and is positioned at the downstream of the pole piece thinning device, and the tab cutting device is used for cutting the edge of the pole piece to form a tab. The position sensor is arranged between the pole lug cutting device and the pole piece thinning device and used for sensing the tape moving position of the pole piece so as to control the starting of the pole lug cutting device. In the technical scheme, the pole piece can be cut to form the pole lug by arranging the pole lug cutting device; and moreover, a position sensor is arranged to determine the cutting position of the pole lug, so that the cutting accuracy of the pole piece is improved.

In some embodiments, the pole piece forming apparatus further comprises: and the detection sensor is arranged at the downstream of the pole piece thinning device along the tape moving path and is used for detecting the thickness of the pole piece. The detection sensor is arranged to detect the thinned pole piece, so that the thinning accuracy of the pole piece is improved.

In some embodiments, the pole piece forming apparatus further comprises a buffer device. The caching device is arranged at the upstream of the pole piece thinning device along the tape transport path and is used for controlling the speed of the pole piece passing through the pole piece thinning device. Through setting up buffer, can adjust the speed that the pole piece was cut thin, guarantee that the pole piece process of cutting has sufficient operating time, promote the accuracy that the pole piece cut thin the position.

In some embodiments, the buffer device comprises at least two buffer rollers, the buffer rollers are used for being connected with the pole piece in a winding mode, and the distance between the two buffer rollers is adjustable. Through setting up the buffer memory roller, can adjust the speed that the pole piece removed, adapt to the operation that the pole piece skived the device.

In some embodiments, the pole piece forming apparatus further comprises two pairs of tensioning rollers for tensioning the pole piece, and the pole piece thinning device is disposed between the two tensioning rollers. Through setting up the tensioning roller, reduce the pole piece and pass through the shake of pole piece device of thinning, improve the regional uniformity of pole piece thinning, reduce the probability that the thinning degree of depth is inhomogeneous, broken belt, destruction foil layer appear in the thinning process.

In some embodiments, the pole piece conveying device includes an unwinding roller and a winding roller, two ends of the pole piece are respectively connected with the unwinding roller and the winding roller, and the unwinding roller and the winding roller rotate around the same direction to convey the pole piece along the conveying direction. According to the technical scheme, the operation speed of the pole piece is controlled by controlling the winding speed of the unwinding roller and the winding roller, so that the accuracy of the pole piece cutting and thinning positions is improved, and the production efficiency of the pole piece is improved.

In a third aspect, the present application provides a pole piece of a battery, which is manufactured by the pole piece molding apparatus as in the above embodiments.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a pole piece thinning apparatus according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a suction hood according to some embodiments of the present disclosure;

FIG. 3 is a schematic diagram of a laser arrangement according to some embodiments of the present application;

FIG. 4 is a schematic structural view of a pole piece forming apparatus according to some embodiments of the present application;

FIG. 5 is a schematic structural diagram of a pole piece forming apparatus according to another embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a pole piece according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of a cross-section of a pole piece of an embodiment of the present application.

Detailed description of the reference numerals

1. Pole piece forming equipment; 10. a pole piece thinning device; 101. thinning the component; 102. a dust-collecting member; 103. a dust hood; 104. a pole piece inlet; 105. cleaning the opening; 106. a dust suction port; 107. a laser; 108. an air inlet; 109. an air knife; 20. pole pieces; 201. a tab; 202. presetting a thinning area; 30. a pole piece conveying device; 301. unwinding the roller; 302. a wind-up roll; 40. a tab cutting device; 50. a position sensor; 60. a detection sensor; 70. a cache device; 701. a first buffer roller; 702. a second buffer roller; 80. and (4) tensioning the rollers.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing the embodiments of the present application and for simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

A battery cell generally includes a case and an electrode assembly, which is a component of the battery cell in which electrochemical reactions occur. One or more electrode assemblies may be contained within the housing. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the main body of the electrode assembly, and the positive and negative active materials react with the electrolyte during the charge and discharge of the battery, and the tabs are connected to the electrode terminals to form a current loop.

And after the electrode assembly is wound, cold/hot pressing shaping is carried out to reduce the thickness of the electrode assembly. In the research process, the inventor finds that the corners of the inner ring of the electrode pole piece are easy to break after being wound due to the large shaping pressure, so that metal leakage and lithium precipitation of the electrode pole piece are caused at the corners. In the related technology, a mode of optimizing winding and pressure parameters is adopted, or a mode of rubberizing or gluing is carried out on the corners of the pole pieces before winding, so that the problem of pole piece fracture is relieved. However, the above technical solution needs to add a gluing process, which can prolong the production time and reduce the production efficiency, and also increase the production cost. And the volume and the quality of the pole piece can be increased by gluing, and the energy density of the battery is reduced.

Based on the above consideration, the inventor researches and designs a pole piece thinning device in order to reduce the occurrence probability of lithium precipitation and fracture phenomena at the corners of the pole piece. In the technical scheme of this application embodiment, the active material in partial region on the pole piece is cut thin through setting up the component of cutting thin to reduce the thickness of this regional pole piece, set up the active material that dust absorption component will peel off simultaneously and in time clear away. The structure can thin the pole piece rapidly, reduces the stress of the corner area of the pole piece, reduces the suction of lithium ions of the pole piece at the corner area, improves the operation stability of the pole piece, and improves the safety performance of the battery.

For convenience of description, the following embodiments are described with reference to a pole piece thinning apparatus according to an embodiment of the present application.

Referring to fig. 1 to 5, fig. 1 is a pole piece thinning apparatus 10 according to some embodiments of the present disclosure. Fig. 2 is a schematic structural view of the dust hood 103 according to some embodiments of the present disclosure. Fig. 3 is a schematic diagram of the arrangement of the laser 107 according to some embodiments of the present application. Fig. 4 is a schematic structural diagram of a pole piece forming apparatus 1 according to some embodiments of the present application. Fig. 5 is a schematic structural diagram of a pole piece forming apparatus 1 according to another embodiment of the present application.

As shown in the drawings, the pole piece thinning apparatus 10 in the embodiment of the present application includes: a thinning member 101 and a dust suction member 102. The thinning member is provided on the tape running path of the pole piece 20 and is used for peeling part of the active material of the pole piece 20 from the pole piece 20. The dust suction member 102 is opposed to the pole piece 20 and sucks the active material peeled off from the pole piece 20.

In particular, the tape path is the path of travel of the pole piece 20 on the skiving device. For example, the tape transport path may be a linear transport path in one direction, or may be a path moving between a plurality of transport rollers. The above-mentioned tape path can be set according to the production requirement, and is not limited herein. The active material is usually formed on the pole piece 20 by coating a slurry containing the active material on the metal surface and drying, and the formed product is a layered solid. The active substance can be peeled from the surface of the pole piece 20 through laser irradiation or scraping by a scraper and the like. The thinning member 101 is used for thinning the active material on the pole piece 20, and may be a laser emitter or a scraper. The dust suction member 102 is used for absorbing active substances peeled from the surface of the pole piece 20. It can be understood that the attraction force of the dust collection member 102 should not exceed the adsorption force between the active material layer and the metal, so as to avoid the active material which is not peeled off being directly absorbed by the dust collection member 102, resulting in the loss of the normal surface active material of the pole piece 20.

In the technical scheme of the embodiment of the application, in order to avoid the occurrence of phenomena such as active material separation, pole piece 20 tape breakage or lithium separation in the corner area, part of the active material in the corner area of the pole piece 20 is removed, and the thickness of the pole piece 20 in the corner area is reduced, so that the stress of the pole piece 20 in the corner area is reduced, and the effect of reducing the probability of occurrence of tape breakage and lithium separation in the corner area of the pole piece 20 is achieved. Specifically, the thinning component 101 is arranged to thin the active material on the partial region of the pole piece 20 so as to reduce the thickness of the pole piece 20 in the region, and the dust suction component 102 is arranged to absorb the stripped active material in time, so that the structure can quickly thin the pole piece 20, reduce the stress in the corner region of the pole piece 20, improve the operation stability of the pole piece 20, and improve the safety performance of the battery.

In some embodiments of the present application, as shown in fig. 1 and 2, the suction member 102 comprises a suction hood 103, the suction hood 103 having a pole piece inlet 104, a pole piece outlet (not shown), a cleaning opening 105, and a suction opening 106, the cleaning opening 105 being disposed between the pole piece inlet 104 and the pole piece outlet and being configured to expose the pole piece 20. The thinning member 101 includes a laser 107, and a laser exit port of the laser 107 is provided toward the cleaning port 105.

Through setting up suction hood 103 to the dust volume is big when solving pole piece 20 and skiving, and unable in time clearance appears piling up the problem that leads to disconnected area. In addition, the width and the depth required by high-precision thinning are realized by arranging the laser 107, and the problems that when the pole piece 20 is thinned, the roll passing circle jumps, the cutter is unstable, and the precision of the thinning depth cannot be ensured are solved.

In some embodiments of the present application, the dust hood 103 has a receiving cavity, the pole piece inlet 104, the pole piece outlet, the cleaning opening 105 and the dust suction opening 106 are respectively connected with the receiving cavity, and the dust suction member 102 further includes a negative pressure mechanism, and the negative pressure mechanism is communicated with the dust suction opening 106. The pole piece inlet 104, the pole piece outlet, the cleaning opening 105 and the dust suction opening 106 are communicated through an accommodating cavity. The stripped active material is stripped from the pole piece 20 and temporarily received in the receiving cavity. The negative pressure mechanism is communicated with the containing cavity through the dust suction port 106, so that the stripped active substances can be sucked out from the dust suction port 106 through the containing cavity by the negative pressure mechanism, and the thinning efficiency of the pole piece 20 is improved.

In some embodiments of the present application, the dust collection cover 103 further has an air inlet 108 communicating with the accommodating chamber, the cleaning opening 105 is disposed between the air inlet 108 and the dust collection opening 106, and the dust collection member 102 further includes an air knife 109 communicating with the air inlet 108. Through setting up air intake 108 and dust absorption mouth 106 cooperation, the active material that in time the suction is peeled off reduces the active material that peels off and leaks the possibility from the pole piece export, further promotes the cleanliness in the holding chamber.

In some embodiments of the present application, please refer to fig. 2 and fig. 3 in combination, the number of the cleaning openings 105 is two, two cleaning openings 105 are respectively disposed on two sides of the pole piece 20, and two lasers 107 are correspondingly disposed. By arranging the two lasers 107, active substances on two opposite surfaces of the pole piece 20 can be simultaneously removed, and the thinning efficiency of the pole piece 20 is improved.

In some embodiments of the present application, two purge ports 105 are staggered along both sides of pole piece 20. The cleaning ports 105 are arranged in a staggered mode, damage caused by the fact that the two lasers 107 are shot to each other can be avoided, and safety and stability of production are improved.

The embodiment of the present application further provides a pole piece forming apparatus 1, as shown in fig. 4, the pole piece forming apparatus 1 includes a pole piece conveying device 30 and a pole piece thinning device 10. The pole piece conveying device 30 is used for conveying the pole piece 20 along a tape path. The pole piece thinning apparatus 10 is disposed on a tape path of the pole piece 20. The pole piece forming equipment 1 provided by the embodiment of the application can thin partial area on the pole piece 20 in the conveying process of the pole piece 20, and improves the production convenience of the pole piece 20.

In some embodiments of the present application, as shown in fig. 5, the pole piece forming apparatus 1 further includes a tab cutting device 40 and a position sensor 50. The tab cutting device 40 is arranged on the tape path of the pole piece 20 and located at the upstream of the pole piece thinning device 10, and the tab cutting device 40 is used for cutting the edge of the pole piece 20 to form a tab 201. The position sensor 50 is arranged between the tab cutting device 40 and the pole piece thinning device 10, and the position sensor 50 is used for sensing the tape running position of the pole piece 20 to control the opening of the pole piece thinning device 10.

Specifically, referring to fig. 4 and fig. 6, the pole piece 20 moves along the tape path through the pole piece conveying device 30, and the tab cutting device 40 first cuts the pole piece 20 to form the tab 201. After the tab 201 is formed, the position sensor 50 calculates the preset time for starting the pole piece thinning device 10 by using the distance between the tab 201 and the preset thinning area 202 and the conveying speed of the pole piece conveying device 30 based on the position of the tab 201, and controls the pole piece thinning device 10 to thin the preset thinning area 202 of the pole piece 20 at the preset time. It is to be understood that the above calculation process may be performed manually, or may be performed by setting an electronic computing device, which is not limited herein. Further, the thickness and width of the pole piece 20 can be precisely controlled by controlling the irradiation intensity and irradiation range of the laser 107.

In the above configuration, the tab cutting device 40 is provided to cut the pole piece 20 to form the tab 201. Moreover, the position sensor 50 is arranged, so that the thinning position of the pole piece 20 can be determined, and the accuracy of thinning the pole piece 20 is improved.

In other embodiments of the present application, a tab cutting device 40 is provided in the path of the pole piece 20, downstream of the pole piece thinning apparatus 10. The tab cutting device 40 is used for cutting the edge of the pole piece 20 to form a tab 201, and the tab 201 can facilitate the connection of the pole piece 20 with other equipment. The position sensor 50 is arranged between the tab cutting device 40 and the pole piece thinning device 10 for sensing the tape-moving position of the pole piece 20 to control the opening of the tab cutting device 40.

Specifically, referring to fig. 5 and fig. 6, the pole piece 20 moves along the tape path through the pole piece conveying device 30, and the pole piece thinning device 10 firstly thins a partial area on the pole piece 20 to form a predetermined thinning area 202. Meanwhile, the thickness and width of the pole piece 20 to be thinned are precisely controlled by controlling the irradiation intensity and irradiation range of the laser 107. The position sensor 50 calculates the preset time for starting the tab cutting device 40 by using the position of the preset thinning area 202 as a reference and the distance between the preset thinning area 202 and the tab 201 and the conveying speed of the pole piece conveying device 30, and controls the tab cutting device 40 to perform the tab 201 cutting operation on the pole piece 20 at the preset time.

In the above technical solution, the tab cutting device 40 is arranged to cut the pole piece 20 to form the tab 201; and, set up position sensor 50, confirm the position that utmost point ear 201 was cut, promote the accuracy of pole piece 20 cutting.

In some embodiments of the present application, the pole piece forming apparatus 1 further includes a detection sensor 60 disposed downstream of the pole piece thinning device 10 along the tape path, and the detection sensor 60 is used for detecting the thickness of the pole piece 20.

For example, referring to fig. 4, fig. 5 and fig. 7, after the pole piece 20 is thinned, the active material on the surface is stripped, and the thickness of the predetermined thinning area 202 is smaller than that of the other areas of the pole piece 20. By providing the detection sensor 60, the thickness of the pole piece 20 in the predetermined thinning region 202 can be detected. For example, the detecting sensor 60 may be a thickness sensor capable of detecting the difference between the thickness of the predetermined thinning-out area 202 and the thickness of the other areas of the pole piece 20. Alternatively, when the active material on the predetermined thinned region 202 needs to be completely removed, the detection sensor 60 may also be a metal sensor, and may detect whether the metal foil of the predetermined thinned region 202 is completely exposed.

According to the technical scheme, the thinned pole piece 20 is detected by arranging the detection sensor 60, so that the thinning accuracy of the pole piece 20 is improved.

In some embodiments of the present application, the pole piece forming apparatus 1 further comprises: and the buffer device 70 is arranged at the upstream of the pole piece thinning device 10 along the tape travelling path, and the buffer device 70 is used for controlling the speed of the pole piece 20 passing through the pole piece thinning device 10. Through setting up buffer device 70, can adjust the speed that pole piece 20 skived, guarantee that pole piece 20 skived the process and have sufficient operating time, promote the accuracy of pole piece 20 skiving position.

In some embodiments of the present application, the buffer device 70 comprises at least two buffer rollers, the buffer rollers are used for winding connection with the pole piece 20, and the distance between the two buffer rollers is adjustable.

The buffer device 70 in the embodiment of the present application includes a first buffer roller 701 and a second buffer roller 702. Wherein the first buffer roller 701 and/or the second buffer roller 702 are movable in a vertical direction. Illustratively, when the first buffer roller 701 and the second buffer roller 702 move in a direction to approach each other, the distance between the first buffer roller 701 and the second buffer roller 702 decreases, the length of the tab 201 wound between the first buffer roller 701 and the second buffer roller 702 decreases, and the moving speed of the pole piece 20 by the pole piece thinning apparatus 10 increases. The above applies to the case when the pole piece thinning apparatus 10 is not operating. When the first buffer roller 701 and the second buffer roller 702 move in a direction away from each other, the distance between the first buffer roller 701 and the second buffer roller 702 increases, the length of the tab 201 wound between the first buffer roller 701 and the second buffer roller 702 increases, and the moving speed of the pole piece 20 by the pole piece thinning apparatus 10 decreases. The above case applies to the case where the pole piece thinning apparatus 10 thins the pole piece 20.

By arranging the buffer rollers, the speed of the pole piece 20 when passing through the pole piece thinning device 10 can be adjusted, and the operation of the pole piece thinning device 10 is adapted.

In some embodiments of the present application, please refer to fig. 3 in combination, the pole piece forming apparatus 1 further includes two pairs of tensioning rollers 80, the two pairs of tensioning rollers 80 are used for tensioning the pole piece 20, and the pole piece thinning apparatus 10 is disposed between the two tensioning rollers 80. By arranging the tensioning roller 80, the vibration of the pole piece 20 passing through the pole piece thinning device 10 is reduced, the consistency of the thinning area of the pole piece 20 is improved, and the probability of uneven thinning depth, belt breakage and metal layer damage in the thinning process is reduced.

In some embodiments of the present application, the pole piece conveying device 30 further includes an unwinding roller 301 and a winding roller 302, two ends of the pole piece 20 are respectively connected to the unwinding roller 301 and the winding roller 302, and the unwinding roller 301 and the winding roller 302 rotate around the same direction to convey the pole piece 20 along the conveying direction. According to the technical scheme, the operation speed of the pole piece 20 is controlled by controlling the winding speed of the unwinding roller 301 and the winding roller 302, so that the accuracy of the cutting and thinning positions of the pole piece 20 is improved, and the production efficiency of the pole piece 20 is improved.

According to some embodiments of the present application, the present application further provides a pole piece 20 of a battery, which is manufactured by the pole piece forming apparatus 1 according to any one of the above aspects. The pole piece 20 of the battery that this application embodiment provided forms electrode subassembly after cold press forming, and the active material of this electrode subassembly corner is cut thin by at least part, has reduced the stress of pole piece 20 corner, has reduced the probability that the disconnected area of corner, the lithium of separating out scheduling problem emergence, has prolonged the cycle life of battery, has promoted the security of battery operation.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

Claims (15)

1. A pole piece skiving apparatus (10), comprising:

a thinning component (101) which is arranged on a tape path of a pole piece (20) and is used for stripping partial active substances of the pole piece (20) from the pole piece (20);

and a dust suction member (102) which is used for being opposite to the pole piece (20) and sucking the active substances stripped from the pole piece (20).

2. The pole piece thinning apparatus (10) of claim 1 wherein said suction member (102) comprises a suction hood (103), said suction hood (103) having a pole piece inlet (104), a pole piece outlet, a cleaning port (105) and a suction port (106), said cleaning port (105) being disposed between said pole piece inlet (104) and said pole piece outlet for exposing said pole piece (20); the thinning means (101) comprises a laser (107), the laser exit opening of the laser (107) being arranged towards the cleaning opening (105).

3. The pole piece thinning apparatus (10) of claim 2, wherein the dust hood (103) has a receiving cavity, the pole piece inlet (104), the pole piece outlet, the cleaning opening (105) and the dust suction opening (106) are respectively connected with the receiving cavity, and the dust suction member (102) further comprises a negative pressure mechanism, and the negative pressure mechanism is communicated with the dust suction opening (106).

4. The pole piece thinning apparatus (10) of claim 3, wherein the dust hood (103) further comprises an air inlet (108) communicated with the accommodating cavity, the cleaning opening (105) is arranged between the air inlet (108) and the dust suction opening (106), and the dust suction member (102) further comprises an air knife (109) communicated with the air inlet (108).

5. The pole piece thinning apparatus (10) of any one of claims 2 to 4, wherein the number of the cleaning openings (105) is two, two cleaning openings (105) are respectively disposed on two sides of the pole piece (20), and two lasers (107) are correspondingly disposed.

6. The pole piece thinning apparatus (10) of claim 5 wherein two of said cleaning ports (105) are staggered along both sides of said pole piece (20).

7. A pole piece forming apparatus (1), comprising:

the pole piece conveying device (30) is used for conveying the pole piece (20) along the tape conveying path; and

the pole piece thinning apparatus (10) of any one of claims 1 to 6, said pole piece thinning apparatus (10) being disposed on a tape path of said pole piece (20).

8. The pole piece forming apparatus (1) according to claim 7, further comprising;

the pole lug cutting device (40) is arranged on a tape travelling path of the pole piece (20) and is positioned at the upstream of the pole piece thinning device (10), and the pole lug cutting device (40) is used for cutting the edge of the pole piece (20) to form a pole lug (201);

and the position sensor (50) is arranged between the tab cutting device (40) and the pole piece thinning device (10), and the position sensor (50) is used for sensing the tape travelling position of the pole piece (20) so as to control the starting of the pole piece thinning device (10).

9. The pole piece forming apparatus (1) according to claim 7, further comprising;

the pole lug cutting device (40) is arranged on a tape travelling path of the pole piece (20) and is positioned at the downstream of the pole piece thinning device (10), and the pole lug cutting device (40) is used for cutting the edge of the pole piece (20) to form a pole lug (201);

the position sensor (50) is arranged between the pole lug cutting device (40) and the pole piece thinning device (10), and the position sensor (50) is used for sensing the tape running position of the pole piece (20) so as to control the pole lug cutting device (40) to be started.

10. The pole piece forming apparatus (1) according to claim 8, further comprising a detection sensor (60) disposed downstream of said pole piece thinning device (10) along said tape path, said detection sensor (60) being configured to detect a thickness of said pole piece (20).

11. Pole piece forming apparatus (1) according to one of the claims 7 to 10, further comprising a buffer device (70), wherein the buffer device (70) is arranged upstream of the pole piece skiving device (10) along the tape path, wherein the buffer device (70) is adapted to control the speed of the pole piece (20) through the pole piece skiving device (10).

12. Pole piece forming device (1) according to claim 11, characterized in that the buffer device (70) comprises at least two buffer rollers for the winding connection with the pole piece (20), the distance between the two buffer rollers being adjustable.

13. Pole piece forming apparatus (1) according to one of the claims 7 to 10, further comprising two pairs of tensioning rollers (80), two pairs of tensioning rollers (80) being used for tensioning the pole piece (20), the pole piece thinning device (10) being provided between two of the tensioning rollers (80).

14. Pole piece forming apparatus (1) according to one of the claims 7 to 10, characterized in that the pole piece conveying device (30) comprises an unwinding roller (301) and a winding roller (302), the two ends of the pole piece (20) are connected with the unwinding roller (301) and the winding roller (302) respectively, the unwinding roller (301) and the winding roller (302) rotate around the same direction to convey the pole piece (20) along the conveying direction.

15. Pole piece (20) of a battery, characterized by being manufactured by a pole piece forming apparatus (1) according to any one of claims 7 to 14.

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