CN217062154U

CN217062154U - Lithium supplementing device

Info

Publication number: CN217062154U
Application number: CN202220376773.XU
Authority: CN
Inventors: 李云明; 史东昕; 王学飞; 和冲冲; 张二勇
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-07-26
Anticipated expiration: 2032-02-23

Abstract

The utility model provides a pair of mend lithium device relates to battery production technical field to optimize to a certain extent and mend lithium device structure, improve the flexibility ratio and the maneuverability of device. The utility model provides a lithium supplementing device, which comprises a first lithium covering mechanism and a second lithium covering mechanism which are arranged at two sides of a pole piece retracting mechanism; the first lithium coating mechanism comprises a first lithium strip unwinding part, a first rolling assembly and a first coating part, and the second lithium coating 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 and the second coating piece are used for coating a release agent, the lithium belt is thinned and extended through the first calendaring assembly, and the lithium belt is pressed on one side, facing the first lithium covering mechanism, of the pole piece; and the second coating part coats a release agent on the lithium belt or the second calendaring assembly, thins and extends the lithium belt through the second calendaring assembly, and covers the other side of the pole piece in a pressing manner.

Description

Lithium supplementing device

Technical Field

The utility model belongs to the technical field of the battery production technique and specifically relates to a mend lithium device is related to.

Background

The lithium ion battery has the advantages of high energy density, long cycle life, no memory effect and the like, so that the lithium ion battery becomes the first choice for consumer electronic batteries and new energy automobile power batteries. However, in the first charge and discharge process of the lithium ion battery electrode material, the formation of the solid electrolyte membrane causes lithium loss, thereby limiting the exertion of the energy density of the lithium ion battery, and the active lithium loss caused by side reaction in the cycle process also causes the shortening of the cycle life. Therefore, the lithium supplement of the anode plate is an effective means for improving the energy density and the cycle life of the lithium ion battery.

The conventional lithium foil lithium supplementing device generally adopts six rollers which are closely arranged to press and cover the lithium foil on the pole piece, but the flexible adjustment of the spacing pressure between the two rollers is difficult to realize in the mode.

Therefore, it is urgently needed to provide a lithium supplementing device to solve the problems in the prior art to some extent.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mend lithium device to optimize to a certain extent and mend lithium device structure, improve the flexibility ratio and the maneuverability of device.

The utility model provides a lithium supplementing device, which comprises a first lithium covering mechanism and a second lithium covering mechanism which are arranged at 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 calendaring assembly is pressed on one side, facing the second lithium covering mechanism, of the pole piece.

Wherein the first calendaring assembly comprises a lithium ribbon transfer roll and a first calendaring roll; the lithium belt transfer roll and the first calendering roll are correspondingly arranged, the lithium belt transfer roll is abutted against the pole piece, and the lithium belt enters the space between the lithium belt transfer roll and the first calendering roll, is thinned and extended, covers the lithium belt transfer roll, and is transferred and pressed on the pole piece by the lithium belt transfer roll.

Specifically, the first calendaring assembly further comprises a first repellent film 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.

Further, the second calendering assembly comprises a first driving roller, a second driving roller, a conveyor belt and a second calendering 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.

Still further, the second calendering assembly further comprises a support roll positioned within the conveyor belt for adjusting the tension of the conveyor belt.

Further, the second calendaring assembly further comprises a second repellent film collecting and releasing assembly; the second repellent film winding and unwinding assembly comprises a second unwinding roller and a second winding roller, and the repellent 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 driving 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.

Further, the first repelling film collecting and releasing assembly comprises a first auxiliary roller corresponding to the first calendering roller and/or the second repelling film collecting and releasing assembly 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.

Specifically, the first lithium coating mechanism further comprises a first cleaning piece, and the second lithium coating mechanism further comprises a second cleaning piece; the first cleaning piece is used for cleaning the residual lithium belts on the lithium belt transfer roller, and the second cleaning piece is used for cleaning the residual lithium belts on the conveying belt.

Specifically, the first lithium coating mechanism further comprises a first trimming piece, and the second lithium coating mechanism further comprises a second trimming 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.

Further, the diameter of the lithium strip transfer roller is larger than that of the first calendaring roller, and the diameter of the first driving roller is larger than that of the second driving roller.

Compared with the prior art, the utility model provides a mend lithium device has following advantage:

the utility model provides a lithium supplementing device, which comprises a first lithium coating mechanism and a second lithium coating mechanism which are arranged at two sides of a pole piece retracting mechanism; the first lithium coating mechanism comprises a first lithium strip unwinding part, a first rolling assembly and a first coating part, and the second lithium coating 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 the 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 lithium belt is pressed on one side, facing the second lithium covering mechanism, of the pole piece.

Therefore, the analysis shows that the pole piece can move along the fixed direction through the pole piece retracting and releasing mechanism, and in the moving process, the lithium belts can be pressed and covered on the two sides of the pole piece through the first lithium covering mechanism and the second lithium covering mechanism which are arranged on the two sides of the pole piece retracting and releasing mechanism, so that the lithium supplementing operation of the pole piece is realized.

And because first lithium mechanism that covers in this application includes first pressure and covers the subassembly, the second covers lithium mechanism and includes that the second presses and covers the subassembly, and first pressure covers subassembly and second and presses and cover the subassembly and can press thin extension with the lithium area that corresponds the transport, and press and cover on the pole piece, therefore, the benefit lithium device that this application provided realizes that the process that the lithium area pressed and covers the operation only covers the subassembly through first pressure and second, promptly in the benefit lithium device that this application provided, the position that contacts with the pole piece only has two, thereby can press to cover the subassembly to the pressure of pole piece to the subassembly to first pressure and second more conveniently and adjust, and then improve the flexibility ratio and the maneuverability of overall device to a certain extent, and, there is not other interference structure, make the benefit lithium process faster.

Because the lithium area need be rolled thin extension and is carried the pressure to cover to the pole piece through first calendering subassembly and second calendering subassembly, consequently, can be to first lithium area through the first coating piece that sets up in this application and unreel the lithium area of a release or scribble the release on the first calendering subassembly, can unreel the lithium area of a release to the second lithium area through the second coating piece and scribble the release on the second calendering subassembly to make the lithium area can be pressed more smoothly and cover on the pole piece.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram illustrating a release agent coated on a lithium tape in a lithium replenishing device provided by an embodiment of the present invention;

fig. 2 is a schematic structural view of a lithium replenishing device provided in an embodiment of the present invention, in which an auxiliary roller is disposed in a conveyor belt;

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

In the figure: 1-unwinding a pole piece; 101-pole piece; 2-pole piece winding roller; 3-a first lithium strip unwinding member; 4-a second lithium strip unwinding member; 5-a first coated part; 6-a second coated piece; 7-lithium tape transfer roll; 8-a first calendering roll; 9-a first unwinding roller; 10-a first wind-up roll; 11-a first auxiliary roller; 12-a second unwind roll; 13-a second wind-up roll; 14-a first drive roll; 15-a second driving roller; 16-a conveyor belt; 17-a second calendering roll; 18-supporting rolls; 19-a first cleaning member; 20-a second cleaning member; 21-a first trim piece; 22-a second trim piece; 23-a lithium tape; 24-repulsive membranes.

Detailed Description

In order to make the objects, 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall 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", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

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

For ease of description, spatial relationship terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatial relationship 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 for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, 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 of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of this application. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope claimed in the present application.

As shown in fig. 1-3, the present invention provides a lithium supplementing device, which comprises a first lithium covering mechanism and a second lithium covering mechanism disposed on two sides of a pole piece 101 retracting mechanism; the first lithium covering mechanism comprises a first lithium strip unwinding part 3, a first rolling assembly and a first coating part 5, and the second lithium covering mechanism comprises a second lithium strip unwinding part 4, a second rolling assembly and a second coating part 6; the first lithium strip unwinding part 3 and the second lithium strip unwinding part 4 correspondingly convey the lithium strips 23 to the first rolling assembly and the second rolling assembly respectively; the first coating part 5 coats a release agent on the lithium belt 23 or the first calendaring assembly, thins and extends the lithium belt 23 through the first calendaring assembly, and covers one side of the pole piece 101 facing the first lithium covering mechanism in a pressing manner; the second coating member 6 coats the release agent on the lithium strip 23 or the second rolling assembly, thins and extends the lithium strip 23 through the second rolling assembly, and covers the pole piece 101 on the side facing the second lithium covering mechanism.

the utility model provides a mend lithium device can make pole piece 101 move along fixed direction through pole piece 101 jack, and in the motion process, covers lithium mechanism through setting up the first lithium mechanism and the second that cover in pole piece 101 jack both sides, can press lithium area 23 and cover the both sides at pole piece 101 to realize pole piece 101 mend lithium operation.

And because first lithium mechanism that covers in this application includes first pressure and covers the subassembly, the second covers lithium mechanism and includes that the second presses and covers the subassembly, first pressure covers subassembly and second and presses and cover the subassembly and can thin extend the lithium area 23 that corresponds the transport, and press and cover on pole piece 101, therefore, the benefit lithium device that this application provided realizes that the process that lithium area 23 pressed and covers the operation only covers the subassembly through first pressure and second, in the benefit lithium device that this application provided, the position that contacts with pole piece 101 only has two, thereby can more conveniently press and cover the subassembly to adjust the pressure of pole piece 101 to first pressure and cover subassembly and second, and then improve the activity flexibility and the maneuverability of whole device to a certain extent, and, there is not other interference structure, make the benefit lithium process faster.

Because lithium area 23 needs to be pressed thin extension and transport and press to cover to pole piece 101 through first calendering subassembly and second calendering subassembly, consequently, can release the release agent on the lithium area 23 of rolling up 3 release or on first calendering subassembly to first lithium area through first coating 5 that sets up in this application, can release the release agent on the lithium area 23 of rolling up 4 release or on the second calendering subassembly to second lithium area through second coating 6 to make lithium area 23 can be pressed more smoothly and cover on pole piece 101.

Pole piece 101 jack includes pole piece unwinding roller 1 and pole piece winding roller 2 in this application, and pole piece 101 is played roller 1 by the pole piece and is removed to pole piece winding roller 2. Therefore, in order to ensure that the lithium ribbon 23 can be smoothly pressed on the pole piece 101, the lithium ribbon transfer roll 7 in the first rolling assembly in the present application rotates counterclockwise, and the conveyor belt 16 in the second rolling assembly rotates clockwise. Correspondingly, in order to ensure that the lithium belt 23 can be smoothly thinned and extended, and is transferred and pressed on the pole piece 101 by the lithium belt transfer roller 7 and the conveyor belt 16, as shown in fig. 1-3, the positions of the first lithium belt unwinding part 3 and the second lithium belt unwinding part 4 in the present application are higher than the positions of the first calendaring assembly and the second calendaring assembly, so that the lithium belt 23 can move from top to bottom, and the lithium belt 23 is adhered to the lithium belt transfer roller 7 and the conveyor belt 16.

It should be added here that the thickness of the lithium ribbon 23 released by the first lithium ribbon unreeling member 3 and the second lithium ribbon unreeling member 4 in the present application is 1mm to 2mm, and a lithium foil having a thickness of 2 μm to 10 μm can be formed by the thinning and stretching of the first rolling assembly and the second rolling assembly.

Alternatively, as shown in fig. 1 to 3, the first calender assembly of the first calender assembly in the present application includes a lithium ribbon transfer roll 7 and a first calender roll 8; the lithium belt transfer roller 7 and the first calendering roller 8 are correspondingly arranged, the lithium belt transfer roller 7 is abutted against the pole piece 101, and the lithium belt 23 enters between the lithium belt transfer roller 7 and the first calendering roller 8, is thinned and extended, covers the lithium belt transfer roller 7, and is transferred and pressed on the pole piece 101 by the lithium belt transfer roller 7.

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

When the lithium ribbon transfer roll 7 rotates counterclockwise and the first lithium ribbon unwinding member 3 releases the lithium ribbon 23, the lithium ribbon 23 enters between the first lithium ribbon transfer roll 7 and the first lithium ribbon unwinding member 8 and is thinned, thereby generating elongation. The lithium foil that has been thinned and spread adheres to the lithium belt transfer roller 7 and is conveyed toward the pole piece 101 by the lithium belt transfer roller 7, and since the lithium belt transfer roller 7 abuts against the pole piece 101, the lithium foil can be pressed against the pole piece 101, and the lithium supplement operation can be completed.

As shown in fig. 1-3, the first calender assembly of the present application further includes a first repellent film take-up and pay-off assembly; the first repellent film winding and unwinding assembly comprises a first unwinding roller 9 and a first winding roller 10, and the repellent film 24 moves from the first unwinding roller 9 to the first winding roller 10 and covers the position where the first calendering roller 8 is contacted with the lithium strip transfer roller 7; the connecting line of the axle center of the first unwinding roller 9, the axle center of the first winding roller 10 and the axle center of the first calendering roller 8 is triangle.

Since the lithium foil only needs to adhere to the lithium ribbon transfer roll 7, the outer wall surface of the first reduction roll 8 can be coated with the repellent film 24, so that the adhesion of the lithium foil to the first reduction roll 8 can be avoided.

And through the first unwinding roller 9, the first winding roller 10 and the first calendering roller 8 arranged in the above way, the repellent film 24 can be always in a tight state, so that wrinkles of the repellent film 24 are avoided to a certain extent, and wrinkles are transferred to the lithium foil in the transfer process.

The repellent film 24 in the present application may be a PET film, a PP film, a PE film, a stainless steel foil, etc. with a smooth outer surface, and when the repellent film 24 on the first unwinding roller 9 is completely used up, the repellent film 24 on the first winding roller 10 may be transferred again to the first unwinding roller 9 for recycling. And the first coating piece 5 in this application can also set up between first unreeling roller 9 and first calendering roller 8, and second coating piece 6 can set up between second unreeling roller 12 and second calendering roller 17 to can be to repelling membrane 24 coating release agent, restore the release function of release film.

It should be added here that, in the lithium supplement device provided in the present application, two identical first rolling assemblies disposed oppositely on two sides of the pole piece 101 may be used, and two identical second rolling assemblies may also be used, but preferably, as shown in fig. 1 to fig. 3, one first rolling assembly and one second rolling assembly are used in the present application, and the structures of the first rolling assembly and the second rolling assembly are different.

Therefore, based on the structure of the first rolling assembly described above, as shown in fig. 1 to 3, the second rolling assembly in the present application includes a first driving roller 14, a second driving roller 15, a conveyor belt 16, and a second rolling roller 17; the first driving roller 14 is arranged close to the pole piece 101, and enables the conveyor belt 16 to abut against one side of the pole piece 101, which is far away from the first lithium coating mechanism, and the second driving roller 15 is arranged close to the second calendering roller 17, and enables the conveyor belt 16 to abut against the second calendering roller 17; the second lithium tape unwinding member 4 conveys the lithium tape 23 to a position between the second driving roller 15 and the second calendering roller 17, is stretched and thinned, is covered on the conveyor belt 16, and is transferred and covered on the pole piece 101 by the conveyor belt 16.

When the lithium belt unwinding device is used, the second lithium belt unwinding member 4 conveys the lithium belt 23 to a position between the second driving roller 15 and the second rolling roller 17, so that the lithium belt 23 can be thinned and stretched, is attached to the conveyor belt 16, and is conveyed to the first driving roller 14 by the conveyor belt 16. Because the first driving roller 14 enables the conveying belt 16 to be abutted against the pole piece 101, the lithium foil on the conveying belt 16 can be pressed on the pole piece 101, and lithium supplement operation on two sides of the pole piece 101 can be completed by matching with the first rolling assembly.

Preferably, the diameter of the first driving roller 14 is larger than that of the second driving roller 15, and the diameter of the first driving roller 14 may be the same as that of the lithium ribbon transfer roller 7, and the diameters of the second driving roller 15 and the second reduction roller 17 may be the same as that of the first reduction roller 8.

It should be added here that, in order to ensure the thinning and extending and transferring functions of the lithium belt 23, the positions of the lithium belt transferring roller 7 and the first driving roller 14 in the present application are fixed, and the positions of other structures can be appropriately adjusted according to the requirements, so as to ensure the thinning and extending, transferring and pressing of the lithium belt 23 on the pole piece 101 to a certain extent.

Optionally, as shown in fig. 2, the second calendering assembly in the present application further comprises a support roll 18, the support roll 18 being located within the belt 16 such that adjustment of the tension of the belt 16 is enabled by the support roll 18 being positioned. The number of the supporting rollers 18 in this application can be multiple and the position can be adjusted, so that the tension of the conveyor belt 16 can be properly adjusted according to different requirements.

Optionally, as shown in fig. 1-3, the second calendaring assembly of the present application further comprises a second repellent film retracting assembly; the second repellent film winding and unwinding assembly comprises a second unwinding roller 12 and a second winding roller 13, and the repellent film 24 moves from the second unwinding roller 12 to the second winding roller 13 and covers the position where the second calendering roller 17 is in contact with the second driving roller 15; the connecting line of the axle center of the second unreeling roller 12, the axle center of the second reeling roller 13 and the axle center of the second calendering roller 17 is triangle.

The structure, position and action of the second repelling membrane collecting and releasing assembly in the application are the same as those of the first repelling membrane assembly, and are not described in detail herein.

Based on the first repellent film collecting and releasing assembly and the second repellent film collecting and releasing 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, optionally, the first calendering roll 8 may be correspondingly provided with a first auxiliary roll 11, the second calendering roll 17 may be correspondingly provided with a second auxiliary roll, and the calendering force of the first calendering roll 8 and the second calendering roll 17 can be increased to a certain extent by the pressing of the first auxiliary roll 11 on the first calendering roll 8 and the pressing of the second auxiliary roll on the second calendering roll 17.

It should be noted that, in the present application, the first auxiliary roller 11 and the second auxiliary roller may be provided at the same time, and the first auxiliary roller 11 or the second auxiliary roller may be provided according to the pressure requirement. Preferably, the first auxiliary roller 11 and the second auxiliary roller in this application have a diameter of 200mm to 500 mm.

It should be further added here that, based on the above-mentioned embodiments, the present application provides two coating methods of release agent:

one of them is as 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 ribbons 23, thereby enabling coating of the release agent on the side of the lithium ribbons 23 facing the lithium ribbon transfer roller 7 and the conveyor belt 16. When the release agent is coated on the lithium ribbon 23, the release agent is also coated on the side wall of the lithium ribbon 23.

Alternatively, as shown in fig. 3, the first coating member 5 and the second coating member 6 are in contact with the lithium ribbon transfer roll 7 and the conveyor belt 16, respectively, so that the coating of the release agent can be performed on the lithium ribbon transfer roll 7 and the conveyor belt 16, thereby achieving the adhesion of the lithium foil to the lithium ribbon transfer roll 7 and the conveyor belt 16.

It should be added here that the release agent in the present application is selected from polymethylsiloxane and polyether, and at the same time, a conductive agent, a lithium salt or a mixture of the two may be added inside, so that the release agent has ionic, electronic or mixed conductivity, thereby reducing the influence of the release agent on lithium ion diffusion.

Optionally, as shown in fig. 1 to 3, the first lithium coating mechanism further includes a first cleaning member 19, and the second lithium coating mechanism further includes a second cleaning member 20; through the first cleaning member 19 and the second cleaning member 20, residual lithium foil on the lithium strip transfer roller 7 and the conveyor belt 16 can be cleaned, and stacking of the lithium foil is avoided.

It should be added here that first cleaning member 19 and second cleaning member 20 in this application each include a scraper and a suction nozzle, and the surface lithium foil is scraped off through the scraper, and then the scraped lithium foil is sucked in through the suction nozzle, so as to avoid causing pollution.

Optionally, as shown in fig. 1 to fig. 3, the first lithium cladding mechanism in this application further includes a first trimming member 21, and the second lithium cladding mechanism further includes a second trimming member 22; the first edger 21 is used to correct the lithium ribbon 23 on the lithium ribbon transfer roll 7, and the second edger 22 is used to correct the lithium ribbon 23 on the conveyor belt 16.

Through the first edging 21 and the second edging 22 that set up, can avoid lithium area 23 to press to thin the extension back to a certain extent, the sawtooth state appears in the edge causes to mend the poor problem of lithium alignment degree.

In practical application, the lithium belt edge repairing device comprises two first edge repairing pieces 21 and two second edge repairing pieces 22, wherein the two first edge repairing pieces 21 are oppositely arranged on two sides of the lithium belt transfer roller 7, and the two second edge repairing pieces 22 are oppositely arranged on two sides of the conveyor belt 16, so that the edge of the lithium belt 23 can be repaired.

It should be noted that, in the above embodiment, in order to enhance the electrolyte wetting effect of the lithium supplement electrode sheet 101, the lithium supplement method in the present application may further employ stripe-shaped lithium supplement, and in order to realize the preparation of stripe-shaped lithium, a stripe-shaped lithium metal scraper may be further provided between the edge-trimming knives at both ends of the first edge-trimming member 21 and the second edge-trimming member 22, so that lithium at a stripe position where lithium supplement is not required can be scraped off.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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.