CN217062154U - Lithium supplement device - Google Patents

Abstract

The utility model provides a lithium replenishing device, which relates to the technical field of battery production, so as to optimize the structure of the lithium replenishing device to a certain extent and improve the flexibility and operability of the device. The lithium replenishing device provided by the utility model comprises a first lithium covering mechanism and a second lithium covering mechanism arranged on both sides of the pole piece retracting and releasing mechanism; the first lithium covering mechanism comprises a first lithium belt unwinding member and a first rolling assembly And the first coating member, the second lithium coating mechanism includes a second lithium belt unwinding member, a second calendering assembly and a second coating member; the first lithium belt unwinding member and the second lithium belt unwinding member respectively The belt is correspondingly transported to the first calendering assembly and the second calendering assembly; the first coating member and the second coating member are used to coat the release agent, and the lithium belt is thinned and stretched by the first calendering assembly, and is pressed on the electrode. The sheet faces the side of the first lithium coating mechanism; the second coating member coats the lithium strip or the second rolling component with a release agent, and the lithium strip is thinned and extended by the second rolling component, and is pressed on the other side of the pole piece. side.

Description

Lithium supplement device

technical field

The utility model relates to the technical field of battery production, in particular to a lithium supplementing device.

Background technique

Lithium-ion batteries have become the first choice for consumer electronic batteries and new energy vehicle power batteries due to their high energy density, long cycle life, and no memory effect. However, during the first charge and discharge process of lithium-ion battery electrode materials, the formation of solid electrolyte membrane will lead to lithium loss, which limits the energy density of lithium-ion batteries, and the loss of active lithium caused by side reactions during cycling will also shorten the cycle life. Therefore, supplementing lithium to the counter electrode is an effective means to improve the energy density and cycle life of lithium-ion batteries.

The existing lithium foil replenishment device usually adopts six rollers closely arranged to realize pressing the lithium foil on the pole piece, but this method is difficult to realize flexible adjustment of the spacing pressure between the two rollers.

Therefore, there is an urgent need to provide a lithium supplement device to solve the problems existing in the prior art to a certain extent.

Utility model content

The purpose of the present invention is to provide a lithium replenishing device, so as to optimize the structure of the lithium replenishing device to a certain extent and improve the flexibility and operability of the device.

The utility model provides a lithium replenishing device, comprising a first lithium covering mechanism and a second lithium covering mechanism arranged on both sides of a pole piece retracting and unwinding mechanism; the first lithium covering mechanism includes a first lithium belt unwinding member, A first rolling assembly and a first coating member, the second lithium coating mechanism includes a second lithium tape unwinding member, a second rolling assembly and a second coating member; the first lithium tape unwinding member and the The second lithium tape unwinding member respectively transports the lithium tape to the first calendering assembly and the second calendering assembly; the first coating member coats the lithium tape or the first calendering assembly The lithium strip is thinned and extended by the first calendering component, and is pressed on the side of the pole piece facing the first lithium coating mechanism; the second coating member is directed to the lithium strip or The second calendering component is coated with a release agent, and the lithium strip is thinned and extended by the second calendering component, and pressed on the side of the pole piece facing the second lithium coating mechanism.

Wherein, the first calendering assembly includes a lithium belt transfer roller and a first calendering roller; the lithium belt transfer roller and the first calendering roller are arranged correspondingly, and the lithium belt transfer roller is in contact with the pole piece, The lithium belt enters between the lithium belt transfer roller and the first calendering roller, is thinned and stretched, and is covered on the lithium belt transfer roller, and is transferred and pressed on the pole by the lithium belt transfer roller. a.

Specifically, the first calendering assembly further includes a first repelling film retracting and unwinding assembly; the first repelling film retracting and unwinding assembly includes a first unwinding roller and a first winding roller, and the repelling film is unwound by the first unwinding roller. The roller moves to the first winding roller and covers the contact position of the first calendering roller and the lithium belt transfer roller; the axis of the first unwinding roller, the axis of the first winding roller The connecting line between the axis and the axis of the first calendering roll is in the shape of a triangle.

Further, the second calendering assembly includes a first transmission roller, a second transmission roller, a conveyor belt and a second calendering roller; the first transmission roller is arranged close to the pole piece, and makes the conveyor belt and the pole piece The side away from the first lithium coating mechanism is in contact with each other, the second transmission roller is arranged close to the second calendering roller, and the conveyor belt is in contact with the second calendering roller; the second lithium belt is unwound The lithium belt is conveyed between the second transmission roller and the second calendering roller to be stretched and thinned, and covered on the conveyor belt, and transferred and pressed onto the pole piece by the conveyor belt.

Further, the second calendering assembly further includes a supporting roller, the supporting roller is located in the conveying belt, and is used for adjusting the tension of the conveying belt.

Further, the second calendering assembly further includes a second repelling film retracting and unwinding assembly; the second repelling film retracting and unwinding assembly includes a second unwinding roller and a second winding roller, and the repelling film is formed by the second reeling roller. The unwinding roller moves to the second winding roller and covers the contact position of the second calendering roller and the second transmission roller; the axis of the second unwinding roller, the second winding roller The line connecting the axis of the roller and the axis of the second calendering roller is in a triangle shape.

Further, the first repelling film retracting assembly includes a first auxiliary roller corresponding to the first calendering roller and/or the second repelling film retracting assembly includes a corresponding second calendering roller. A second auxiliary roll; the first auxiliary roll is in contact with the first calendering roll, and the second auxiliary roll is in abutment with the second calendering roll.

Specifically, the first lithium-covering mechanism further includes a first cleaning member, and the second lithium-covering mechanism further includes a second cleaning member; the first cleaning member is used to clean the residual material on the lithium belt transfer roller. The lithium belt, and the second cleaning member is used for cleaning the lithium belt remaining on the conveyor belt.

Specifically, the first lithium-covering mechanism further includes a first trimming member, and the second lithium-covering mechanism further includes a second trimming member; the first trimming member is used for correcting the surface of the lithium belt transfer roller. the lithium belt, the second trimming member is used to correct the lithium belt on the conveyor belt.

Further, the diameter of the lithium belt transfer roll is larger than the diameter of the first calendering roll, and the diameter of the first transmission roll is larger than the diameter of the second transmission roll.

Compared with the prior art, the lithium supplementing device provided by the utility model has the following advantages:

The lithium replenishing device provided by the utility model includes a first lithium coating mechanism and a second lithium coating mechanism arranged on both sides of the pole piece retracting and unwinding mechanism; the first lithium coating mechanism includes a first lithium tape unwinding member and a first rolling component And the first coating member, the second lithium coating mechanism includes a second lithium belt unwinding member, a second calendering assembly and a second coating member; the first lithium belt unwinding member and the second lithium belt unwinding member respectively The belts are correspondingly transported to the first calendering assembly and the second calendering assembly; the first coating member applies a release agent to the lithium belt or the first calendering assembly, and the lithium belt is thinned and stretched by the first calendering assembly, and is pressed on the electrode. The sheet faces the side of the first lithium coating mechanism; the second coating member coats the lithium strip or the second rolling component with a release agent, and the lithium strip is thinned and extended by the second rolling component, and pressed on the pole piece toward the first One side of the double-coated lithium mechanism.

From this analysis, it can be seen that the pole piece can be moved in a fixed direction through the pole piece retracting mechanism. The lithium strip is pressed on both sides of the pole piece, so as to realize the lithium replenishment operation of the pole piece.

Since the first lithium-covering mechanism in this application includes a first pressing component, the second lithium-covering mechanism includes a second pressing component, and the first pressing component and the second pressing component can press the corresponding transported lithium belt It is thinly stretched and pressed on the pole piece. Therefore, the lithium-replenishing device provided by the application realizes the pressing operation of the lithium belt only through the first pressing and second pressing components, that is, in the lithium-replenishing device provided by the present application. , there are only two positions in contact with the pole piece, so that the pressure of the first pressing component and the second pressing component on the pole piece can be adjusted more conveniently, thereby improving the flexibility of the overall device to a certain extent. The operability and the absence of other interfering structures make the lithium replenishment process faster.

Since the lithium belt needs to be thinned and stretched through the first calendering assembly and the second calendering assembly, and conveyed and pressed onto the pole piece, the lithium released to the first lithium belt unwinding member can be released through the first coating member provided in this application. A release agent is applied on the belt or the first calendering component, and the release agent can be applied to the lithium belt or the second calendering component released by the second lithium belt unwinding member through the second coating member, so that the lithium belt can be coated with a release agent. It can be pressed on the pole piece more smoothly.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the following descriptions The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic structural diagram of coating a release agent on a lithium belt in a lithium-replenishing device provided by an embodiment of the present invention;

2 is a schematic structural diagram of an auxiliary roller provided in a conveyor belt provided in a lithium supplementing device provided by an embodiment of the present utility model;

3 is a schematic structural diagram of coating a release agent on a conveyor belt and a lithium belt transfer roller in the lithium replenishing device provided by the embodiment of the present invention.

In the figure: 1-pole piece unwinding roller; 101-pole piece; 2-pole piece winding roller; 3-first lithium belt unwinding piece; 4-second lithium belt unwinding piece; 5-first coating 6-second coating piece; 7-lithium belt transfer roll; 8-first calendering roll; 9-first unwinding roll; 10-first winding roll; 11-first auxiliary roll; 12-first roll Two unwinding rollers; 13-second winding roller; 14-first drive roller; 15-second drive roller; 16-conveyor belt; 17-second calendering roller; 18-support roller; 19-first cleaning piece; 20-second cleaning piece; 21-first trimming piece; 22-second trimming piece; 23-lithium tape; 24-repelling film.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in use, only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying The device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed The connection can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As used herein, the term "and/or" includes any and any combination of any two or more of the associated listed items.

For ease of description, spatially relative terms such as "above", "upper", "under", and "lower" may be used herein to describe one element as shown in the figures to another element relationship. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

The terminology used herein is used to describe various examples only, and not to limit the present disclosure. Singular forms are intended to include plural forms as well, unless the context clearly dictates otherwise. The terms "comprising", "comprising" and "having" enumerate the presence of stated features, quantities, operations, components, elements and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements and/or combinations thereof.

Variations from the shapes shown in the figures may occur due to manufacturing techniques and/or tolerances. Thus, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent after an understanding of the disclosure of this application. Furthermore, while the examples described herein have a wide variety of configurations, other configurations are possible, as will be apparent upon understanding the disclosure of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist. , is not within the scope of protection claimed in this application.

As shown in FIGS. 1 to 3 , the present invention provides a lithium replenishing device, including a first lithium covering mechanism and a second lithium covering mechanism arranged on both sides of the retractable mechanism of the pole piece 101; the first lithium covering mechanism includes a first lithium covering mechanism. A lithium tape unwinding member 3, a first rolling assembly and a first coating member 5, the second lithium coating mechanism includes a second lithium tape unwinding member 4, a second rolling assembly and a second coating member 6; the first lithium The belt unwinding member 3 and the second lithium belt unwinding member 4 respectively transport the lithium belt 23 to the first calendering assembly and the second calendering assembly; the first coating member 5 coats the lithium belt 23 or the first calendering assembly. Forming agent, the lithium strip 23 is thinned and stretched by the first rolling component, and pressed on the side of the pole piece 101 facing the first lithium coating mechanism; the second coating member 6 is coated on the lithium strip 23 or the second rolling component. For the release agent, the lithium strip 23 is thinned and extended by the second rolling component, and pressed onto the side of the pole piece 101 facing the second lithium coating mechanism.

Compared with the prior art, the lithium supplementing device provided by the utility model has the following advantages:

In the lithium replenishing device provided by the present invention, the pole piece 101 can be moved in a fixed direction through the pole piece 101 retracting mechanism, and during the movement process, the first lithium covering mechanism and The second lithium coating mechanism can press the lithium strips 23 on both sides of the pole piece 101 , so as to realize the lithium supplementation operation of the pole piece 101 .

However, since the first lithium-covering mechanism in this application includes a first pressing member, and the second lithium-covering mechanism includes a second pressing member, the first pressing member and the second pressing member can press the corresponding lithium belt 23 to be transported. It is thinly stretched and pressed on the pole piece 101. Therefore, the process of realizing the pressing operation of the lithium belt 23 by the lithium supplementing device provided in this application only passes through the first pressing component and the second pressing component, that is, the supplementary component provided in this application. In the lithium device, there are only two positions that are in contact with the pole piece 101, so that the pressure of the first pressing component and the second pressing component on the pole piece 101 can be adjusted more conveniently, thereby improving the overall performance to a certain extent. The flexibility and operability of the device, and the absence of other interfering structures, make the lithium replenishment process faster.

Since the lithium belt 23 needs to be thinned and stretched through the first rolling assembly and the second rolling assembly, and conveyed and pressed onto the pole piece 101 , the first coating member 5 provided in this application can be used to unwind the first lithium belt. The release agent is coated on the lithium tape 23 released by the piece 3 or on the first rolling component, and the second coating piece 6 can be applied to the lithium tape 23 released by the second lithium tape unwinding piece 4 or on the second rolling component. release agent, so that the lithium strip 23 can be pressed on the pole piece 101 more smoothly.

In this application, the pole piece 101 retracting and unwinding mechanism includes a pole piece unwinding roller 1 and a pole piece winding roller 2 , and the pole piece 101 is moved from the pole piece unwinding roller 1 to the pole piece winding roller 2 . Therefore, in order to ensure that the lithium belt 23 can be smoothly pressed on the pole piece 101, the lithium belt transfer roller 7 in the first calendering assembly in the present application rotates counterclockwise, and the conveyor belt 16 in the second calendering assembly rotates clockwise. Correspondingly, in order to ensure that the lithium belt 23 can be thinned and stretched smoothly, and is transferred and pressed onto the pole piece 101 by the lithium belt transfer roller 7 and the conveyor belt 16, as shown in FIG. 1-FIG. 3, the first lithium belt in this application The positions of the unwinding member 3 and the second lithium tape unwinding member 4 are both higher than the positions of the first calendering assembly and the second calendering assembly, so that the lithium belt 23 can be moved from top to bottom, thereby realizing the adhesion of the lithium belt 23 to the surface. Lithium belt transfer roller 7 and conveyor belt 16.

It needs to be supplemented here that the thickness of the lithium tape 23 released by the first lithium tape unwinding member 3 and the second lithium tape unwinding member 4 in this application is 1 mm-2 mm, and the thickness of the lithium tape 23 released through the first rolling component and the second rolling component is 1mm-2mm. It can form lithium foil with a thickness of 2μm-10μm.

Optionally, as shown in FIGS. 1-3 , the first calendering assembly of the first calendering assembly in this application includes a lithium belt transfer roll 7 and a first calendering roll 8 ; a lithium belt transfer roll 7 and a first calendering roll 8 Correspondingly arranged, and the lithium belt transfer roller 7 is in contact with the pole piece 101, the lithium belt 23 enters between the lithium belt transfer roller 7 and the first calendering roller 8 to be thinned and stretched, and is covered on the lithium belt transfer roller 7. The belt transfer roller 7 is transferred and pressed on the pole piece 101 .

Preferably, as shown in FIGS. 1-3 , the diameter of the lithium belt transfer roll 7 in the present application is larger than the diameter of the first calendering roll 8 , and the diameter of the first calendering roll 8 is 100mm-200mm, and the lithium belt transfer roll 7 The diameter is 200mm-500mm, on the one hand, it can ensure the preparation of ultra-thin metal lithium foil, on the other hand, it can also avoid the extension of the pole piece 101 during the transfer process to a certain extent.

When in use, the lithium belt transfer roller 7 rotates counterclockwise, and the first calendering roller 8 rotates clockwise. When the first lithium belt unwinding member 3 releases the lithium belt 23, the lithium belt 23 enters the first calendering roller 8 and the first calendering roller 8. The lithium belt is thinned between the transfer rolls 7, thereby causing elongation. The thin and stretched lithium foil adheres to the lithium belt transfer roller 7 and is transported to the pole piece 101 by the lithium belt transfer roller 7. Since the lithium belt transfer roller 7 is in contact with the pole piece 101, the lithium foil can be pressed and covered On the pole piece 101, the lithium replenishment operation is completed.

As shown in FIGS. 1-3 , the first calendering assembly in this application further includes a first repelling film retracting and unwinding assembly; the first repelling film retracting and unwinding assembly includes a first unwinding roll 9 and a first winding roll 10, which reject The film 24 is moved from the first unwinding roll 9 to the first winding roll 10, and covers the position where the first calender roll 8 is in contact with the lithium belt transfer roll 7; the axis of the first unwinding roll 9, the first winding The line connecting the axis of the roll 10 and the axis of the first calendering roll 8 forms a triangle.

Since the lithium foil only needs to be adhered to the lithium tape transfer roll 7 , the outer wall surface of the first calender roll 8 can be covered by the repelling film 24 , thereby preventing the lithium foil from adhering to the first calender roll 8 .

However, by the first unwinding roll 9, the first winding roll 10 and the first calendering roll 8 arranged in the above-mentioned manner, the repelling film 24 can always be in a tight state, thereby preventing the repelling film 24 from wrinkling to a certain extent. Resulting in the problem of conveying the wrinkle circuit to the lithium foil during the conveying process.

The repelling film 24 in this application can be PET film, PP film, PE film and stainless steel foil with smooth outer surface. When the repelling film 24 on the first unwinding roller 9 is all used up, the first winding The repellent film 24 on the 10 is transferred to the first unwinding roll 9 again for reuse. In the present application, the first coating member 5 can also be arranged between the first unwinding roll 9 and the first calendering roll 8, and the second coating member 6 can be arranged between the second unwinding roll 12 and the second calendering roll 17, so that the release agent can be applied to the repelling film 24 to restore the release function of the release film.

It needs to be supplemented here that, in the lithium replenishing device provided by the present application, two identical first rolling assemblies disposed on both sides of the pole piece 101 can be used, or two identical second rolling assemblies can be used, But preferably, as shown in FIGS. 1-3 , a first calendering assembly and a second calendering assembly are used in the present application, and the structures of the first calendering assembly and the second calendering assembly are different.

Therefore, based on the structure of the above-mentioned first calendering assembly, as shown in FIGS. 1-3 , the second calendering assembly in this application includes a first driving roll 14 , a second driving roll 15 , a conveyor belt 16 and a second calendering roll 17 ; The first transmission roller 14 is arranged close to the pole piece 101, and the conveyor belt 16 is in contact with the side of the pole piece 101 that is away from the first lithium-covering mechanism. The two calendering rollers 17 are in contact with each other; the second lithium belt unwinder 4 transports the lithium belt 23 between the second transmission roller 15 and the second calendering roller 17 to be stretched and thinned, and covers the conveyor belt 16 and is transferred by the conveyor belt 16 Pressed on the pole piece 101 .

When in use, the second lithium belt unwinding member 4 transports the lithium belt 23 between the second transmission roller 15 and the second calendering roller 17, so that the lithium belt 23 can be thinned and stretched, and attached to the conveyor belt 16, It is conveyed to the first drive roller 14 by the conveyor belt 16 . Since the first transmission roller 14 makes the conveyor belt 16 abut against the pole piece 101 , the lithium foil on the conveyor belt 16 can be pressed against the pole piece 101 , so that the first rolling assembly can complete the two sides of the pole piece 101 . Lithium supplement work.

Preferably, in the present application, the diameter of the first transmission roller 14 is larger than the diameter of the second transmission roller 15, and the diameter of the first transmission roller 14 can be the same as the diameter of the lithium belt transfer roller 7. The second transmission roller 15 and the second calendering roller have the same diameter. The diameter of the roll 17 may be the same as the diameter of the first calender roll 8 .

It should be added here that, in order to ensure the thinning, stretching and transfer functions of the lithium belt 23, the positions of the lithium belt transfer roller 7 and the first transmission roller 14 in this application are fixed, and the positions of other structures can be appropriately adjusted according to requirements. , so as to ensure that the lithium strip 23 is thinned, extended, transferred, and pressed onto the pole piece 101 to a certain extent.

Optionally, as shown in FIG. 2 , the second calendering assembly in the present application further includes a support roller 18 , which is located in the conveyor belt 16 , so that the tension of the conveyor belt 16 can be adjusted by the provided support roller 18 . In the present application, there may be multiple support rollers 18, and the positions are adjustable, so that the tension of the conveyor belt 16 can be adjusted appropriately according to different requirements.

Optionally, as shown in FIGS. 1-3 , the second calendering assembly in the present application further includes a second repelling film retracting and unwinding assembly; the second repelling film retracting and unwinding assembly includes a second unwinding roller 12 and a second winding Roller 13, the repelling film 24 is moved from the second unwinding roll 12 to the second winding roll 13, and covers the position where the second calendering roll 17 contacts the second transmission roll 15; the axis of the second unwinding roll 12, The line connecting the axis of the second winding roll 13 and the axis of the second calendering roll 17 forms a triangle.

The structure, position and action of the second repelling film retractable assembly in the present application are the same as those of the first repelling film assembly, which will not be repeated here.

Based on the above-mentioned first repelling film retractable assembly and second repelling film retractable assembly, as shown in FIG. 1 to FIG. 3 , in order to enhance the strength of the first calendering roll 8 and the second calendering roll 17 and increase the calendering force, optional Specifically, the first calendering roll 8 can be provided with a first auxiliary roll 11, and the second calendering roll 17 can be a corresponding second auxiliary roll. By pressing the first auxiliary roll 11 to the first calendering roll 8, the second auxiliary roll The pressing force of the second calendering roll 17 can increase the calendering force of the first calendering roll 8 and the second calendering roll 17 to a certain extent.

It should be added here that, in this application, the first auxiliary roller 11 and the second auxiliary roller can be provided at the same time, and the first auxiliary roller 11 or the second auxiliary roller can also be provided according to the pressure requirement. Preferably, the diameters of the first auxiliary roll 11 and the second auxiliary roll in the present application are 200mm-500mm.

What needs to be further explained here is that, based on the above-mentioned embodiments, the application provides two coating methods of the release agent:

One of them is shown in FIG. 1 in conjunction with FIG. 2 , the first coating member 5 and the second coating member 6 are respectively in contact with the corresponding lithium belt 23 , so that the lithium belt 23 can be transferred to the lithium belt transfer roller 7 and the conveyor belt 16 . One side is coated with release agent. When the release agent is applied to the lithium belt 23, the sidewall of the lithium belt 23 also needs to be coated with the release agent.

As shown in FIG. 3 , the first coating member 5 and the second coating member 6 are in contact with the lithium belt transfer roller 7 and the conveying belt 16 respectively, so that the lithium belt transfer roller 7 and the conveying belt 16 can be released. agent coating, so as to realize the adhesion of the lithium foil to the lithium belt transfer roller 7 and the conveyor belt 16 .

What needs to be added here is that the release agent in this application is selected from polymethylsiloxanes and polyethers, and at the same time, a conductive agent, lithium salt or a mixture of the two can be added inside, so that the release agent has ionic strength. , electronic or mixed conductance, thereby reducing the influence of the release agent on the diffusion of lithium ions.

Optionally, as shown in FIGS. 1-3 , the first lithium-covering mechanism further includes a first cleaning member 19, and the second lithium-covering mechanism further includes a second cleaning member 20; The cleaning member 20 can clean the residual lithium foil on the lithium belt transfer roller 7 and the conveyor belt 16 to avoid stacking of the lithium foil.

What needs to be added here is that the first cleaning part 19 and the second cleaning part 20 in this application both include a scraper and a suction nozzle, the surface lithium foil is scraped off by the scraper, and then the scraped lithium foil is sucked through the suction nozzle. , to avoid contamination.

Optionally, as shown in FIGS. 1-3 , the first lithium-covering mechanism in the present application further includes a first trimming member 21 , and the second lithium-covering mechanism further includes a second trimming member 22 ; the first trimming member 21 is used to correct the lithium belt 23 on the lithium belt transfer roller 7 , and the second trimming member 22 is used to correct the lithium belt 23 on the conveyor belt 16 .

The provision of the first trimming member 21 and the second trimming member 22 can avoid to a certain extent the problem of poor alignment of lithium replenishment caused by the jagged edge of the lithium belt 23 after being thinned and extended.

In practical application, it includes two first trimming members 21 and two second trimming members 22. The two first trimming members 21 are oppositely arranged on both sides of the lithium belt transfer roller 7, and the two second trimming members are 22 are arranged on opposite sides of the conveyor belt 16 so that the edge of the lithium belt 23 can be corrected.

It needs to be supplemented here that, in the above-mentioned embodiment, in order to improve the electrolyte infiltration effect of the lithium-replenishing pole piece 101, the lithium-replenishing method in this application can also adopt stripe-shaped lithium-supplementation. A striped metal lithium scraper can also be arranged between the edge trimmers at both ends of the first trimming member 21 and the second trimming member 22, so that lithium at the stripe position where lithium supplementation is not required can be scraped off.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (10)

1. A lithium supplementing device is characterized by comprising a first lithium coating mechanism and a second lithium coating mechanism which are arranged on two sides of a pole piece retracting mechanism;

the first lithium covering mechanism comprises a first lithium strip unwinding part, a first rolling assembly and a first coating part, and the second lithium covering mechanism comprises a second lithium strip unwinding part, a second rolling assembly and a second coating part;

the first lithium strip unwinding part and the second lithium strip unwinding part correspondingly convey lithium strips to the first calendaring assembly and the second calendaring assembly respectively;

the first coating piece coats a release agent on the lithium belt or the first calendaring assembly, the lithium belt is thinned and extended through the first calendaring assembly, and the first coating piece is pressed on one side, facing the first lithium covering mechanism, of the pole piece;

the second coating piece coats a release agent on the lithium belt or the second calendaring assembly, the lithium belt is thinned and extended through the second calendaring assembly, and the second coating piece covers one side, facing the second lithium covering mechanism, of the pole piece in a pressing mode.

2. The lithium replenishment device according to claim 1, wherein the first calendaring assembly comprises a lithium ribbon transfer roll and a first calendaring roll;

the lithium belt transfer roller and the first calendering roller are correspondingly arranged, the lithium belt transfer roller is abutted against the pole piece, the lithium belt enters the space between the lithium belt transfer roller and the first calendering roller and is thinly pressed and extended, and the lithium belt transfer roller covers the lithium belt transfer roller and is transferred and pressed on the pole piece by the lithium belt transfer roller.

3. The lithium supplementing device according to claim 2, wherein the first calendaring assembly further comprises a first rejection membrane collecting and releasing assembly;

the first rejection film winding and unwinding assembly comprises a first unwinding roller and a first winding roller, and the rejection film moves from the first unwinding roller to the first winding roller and covers the position where the first calendering roller is contacted with the lithium strip transfer roller;

and the connecting line of the axle center of the first unwinding roller, the axle center of the first winding roller and the axle center of the first calendering roller is triangular.

4. The lithium replenishing device according to claim 3, wherein the second calendaring assembly comprises a first driving roller, a second driving roller, a conveyor belt and a second calendaring roller;

the first driving roller is close to the pole piece, and enables the conveying belt to be abutted against one side of the pole piece, which is far away from the first lithium coating mechanism, and the second driving roller is close to the second calendering roller, and enables the conveying belt to be abutted against the second calendering roller;

the second lithium belt unwinding part conveys the lithium belt to a position between the second transmission roller and the second calendaring roller, is stretched and thinned, covers the conveying belt, and is transferred and pressed on the pole piece by the conveying belt.

5. The lithium replenishment device of claim 4, wherein the second calendaring assembly further comprises a support roller positioned within the conveyor belt for adjusting the tension of the conveyor belt.

6. The lithium supplementing device according to claim 4, wherein the second rolling assembly further comprises a second rejection membrane collecting and releasing assembly;

the second repelling film winding and unwinding assembly comprises a second unwinding roller and a second winding roller, and the repelling film moves from the second unwinding roller to the second winding roller and covers the position where the second calendering roller is contacted with the second transmission roller;

and the connecting line of the axle center of the second unwinding roller, the axle center of the second winding roller and the axle center of the second calendering roller is triangular.

7. The lithium supplementing device according to claim 6, wherein the first repelling film collecting and releasing component comprises a first auxiliary roller corresponding to the first calendering roller and/or the second repelling film collecting and releasing component comprises a second auxiliary roller corresponding to the second calendering roller;

the first auxiliary roller is abutted with the first calendering roller, and the second auxiliary roller is abutted with the second calendering roller.

8. The lithium replenishing device according to claim 6, wherein the first lithium replenishing mechanism further comprises a first cleaning member, and the second lithium replenishing mechanism further comprises a second cleaning member;

the first cleaning piece is used for cleaning the residual lithium belt on the lithium belt transfer roller, and the second cleaning piece is used for cleaning the residual lithium belt on the conveying belt.

9. The lithium supplementing device according to claim 6, wherein the first lithium cladding mechanism further comprises a first edging piece, and the second lithium cladding mechanism further comprises a second edging piece;

the first edge trimmer is used for correcting the lithium belt on the lithium belt transfer roller, and the second edge trimmer is used for correcting the lithium belt on the conveying belt.

10. The lithium supplementing device according to claim 4, wherein the diameter of the lithium ribbon transfer roller is larger than that of the first rolling roller, and the diameter of the first driving roller is larger than that of the second driving roller.

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