CN217544659U - Lithium supplement device and pole piece structure - Google Patents

Abstract

The utility model provides a mend lithium device and pole piece structure, mend the lithium device and be used for coating the negative pole piece of battery with metal lithium membrane on, mend the lithium device and include: the rolling wheel assembly comprises an unwinding roller and a winding roller, a carrier film is arranged between the unwinding roller and the winding roller, and the carrier film is used for loading a metal lithium film; the carrier film is wound on the unwinding roller and the winding roller and is movably arranged so as to convey the metal lithium film to the pole piece; the lithium belt unwinding roller is wound with a lithium belt; a calender roll for pressing the lithium tape and the carrier film to form a metallic lithium film on the carrier film; coating mechanism, coating mechanism set up and unreel between roller and calendering roller at the lithium area, and coating mechanism is used for coating the mold release to lithium area to adjust the mould release power between metal lithium membrane and the carrier membrane, the utility model provides a mend lithium device and solved the problem with high costs that lithium device mended lithium to the lithium cell among the prior art.

Description

Lithium supplementing device and pole piece structure

Technical Field

The utility model relates to a lithium cell field particularly, relates to a mend lithium device and pole piece structure.

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 of consumer electronic batteries and new energy automobile power batteries. However, the lithium loss caused by the formation of a Solid Electrolyte Interface (SEI) film in the first charge and discharge process of the lithium ion battery electrode material limits the exertion of the energy density of the lithium ion battery, the performance is particularly obvious in a silicon-based negative electrode material system, the cycle life is shortened due to the loss of active lithium caused by side reaction in the cycle process, and the lithium supplement to the pole piece is an effective means for improving the energy density and the cycle life of the lithium ion battery.

The lithium foil lithium supplement technology has advantages in safety, cost and efficiency, however, a carrier film with double area of a pole piece is consumed in the lithium supplement process of the existing lithium supplement device, and the carrier film cannot be recycled, so that the lithium supplement cost is too high.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a mend lithium device and pole piece structure to the mend lithium device of solving among the prior art carries out the problem with high costs of mending lithium to the lithium cell.

In order to achieve the above objects, according to one aspect of the present invention, there is provided a lithium supplement device for coating a metal lithium film on a negative electrode tab of a battery, the lithium supplement device comprising: the wheel components, wheel components includes: the device comprises an unwinding roller and a winding roller, wherein a carrier film is arranged between the unwinding roller and the winding roller and used for loading a metal lithium film; the carrier film is wound on the unwinding roller and the winding roller and is movably arranged so as to convey the metal lithium film to the pole piece; the lithium belt unwinding roller is wound with a lithium belt; a calender roll for pressing the lithium tape and the carrier film to form a metallic lithium film on the carrier film; coating mechanism, coating mechanism set up between lithium area unreel roller and calendering roller, and coating mechanism is used for scribbling the release agent to the lithium area to adjust the mould release force between metal lithium membrane and the carrier film.

Further, the reduction rolls include a first reduction roll and a second reduction roll, which are disposed downstream of the coating mechanism, and a distance between the first reduction roll and the second reduction roll is adjustably set to press the lithium tape and the support film.

Further, one surface of the carrier film has a carrier film side for carrying the metallic lithium film, and the other surface of the carrier film has a rough surface side; the first calendering roller is used for abutting against the side of the carrier film, and the second calendering roller is used for abutting against the rough surface side; the first calendering roller and the second calendering roller are both rotatably arranged, and the linear velocity of the first calendering roller is 0.05 times to 0.5 times of the linear velocity of the second calendering roller.

Further, the roller assembly includes: the first calendering auxiliary roller is arranged on one side, away from the second calendering roller, of the first calendering roller and is used for pushing the first calendering roller; the second auxiliary calendering roller is arranged on one side, away from the first calendering roller, of the second calendering roller and is used for pushing the second calendering roller; wherein the value ranges of the first calendering auxiliary roller and the second calendering auxiliary roller are both 200mm to 500mm.

Further, the coating mechanism includes a first coating mechanism provided opposite to the carrier film side and a second coating mechanism provided opposite to the carrier film side; so as to respectively coat different types of release agents on the two sides of the metal lithium on the opposite side of the carrier film and the side of the carrier film through a first coating mechanism and a second coating mechanism.

Further, the roller assembly includes a transfer roller disposed downstream of the coating mechanism, the transfer roller being movably disposed with respect to the pole piece, the carrier film passing between the transfer roller and the pole piece to press the metallic lithium film on the carrier film against the pole piece by the transfer roller.

Further, the roll diameter of the calendering roll is smaller than that of the transfer roll; and/or the roll diameter of the calendering rolls ranges from 100mm to 200mm; and/or the roll diameter of the transfer roll ranges from 200mm to 500mm.

Furthermore, the number of the roller assemblies is two, the two roller assemblies are arranged at intervals, and the transfer rollers of the two roller assemblies are arranged oppositely so as to transfer the lithium metal film to the two opposite sides of the pole piece through the transfer rollers of the two roller assemblies.

Further, mend lithium device still includes deburring mechanism, and deburring mechanism includes: the two carrier film passing rollers are arranged at intervals and are arranged at the downstream of the coating mechanism; and the trimming and carding component is arranged between the two carrier film passing rollers, and is provided with a plurality of stripe bulges which are arranged at intervals along a preset direction.

Further, the lithium supplementing device further comprises a pole piece unwinding roller and a pole piece winding roller, and the pole pieces are wound on the pole piece unwinding roller and the pole piece winding roller.

According to the utility model discloses an aspect provides a pole piece structure, obtains by foretell benefit lithium device preparation, and the pole piece structure includes negative pole piece, and the surface of pole piece is provided with lithium metal and mends the lithium layer, and the face capacity that lithium layer was mended to lithium metal is 5% -30% of pole piece face capacity. Use the technical scheme of the utility model, mend the lithium device and be used for coating the negative pole piece of battery with the metal lithium membrane on, mend the lithium device and include: the rolling wheel assembly comprises an unwinding roller and a winding roller, a carrier film is arranged between the unwinding roller and the winding roller, and the carrier film is used for loading a metal lithium film; the carrier film is wound on the unwinding roller and the winding roller and is movably arranged so as to convey the lithium metal film to the pole piece; the lithium belt unwinding roller is wound with a lithium belt; a calender roll for pressing the lithium tape and the carrier film to form a metallic lithium film on the carrier film; the coating mechanism is arranged between the lithium strip unwinding roller and the calendering roller and is used for coating a release agent on the lithium strip so as to adjust the release force between the metal lithium film and the carrier film. Adopt above-mentioned setting, through the calendering roller with the metal lithium membrane on the lithium area prolong press to the carrier membrane on, through coating mechanism coating release agent on the carrier membrane, thereby make metal lithium membrane and the laminating of carrier membrane, then, the carrier membrane can carry the metal lithium membrane to negative pole piece, in order to accomplish and mend lithium, whole process carrier membrane only plays the effect of transportation, like this, alright with carrier membrane reuse, the problem with high costs that mend lithium device among the prior art mends lithium to the lithium cell has been solved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of an embodiment of a lithium replenishment device according to the present invention;

fig. 2 is a schematic structural diagram of a first embodiment of a transfer roller of the lithium replenishing device of the invention;

fig. 3 is a schematic structural diagram of a second embodiment of a transfer roller of the lithium replenishing device of the present invention;

fig. 4 shows a schematic structural diagram of a third embodiment of the transfer roller of the lithium replenishing device of the present invention;

fig. 5 shows a schematic structural diagram of a trimming and carding part of a transfer roller of the lithium supplementing device;

fig. 6 shows a schematic structural diagram of the pole piece structure of the present invention.

Wherein the figures include the following reference numerals:

10. pole pieces; 20. a lithium metal supplement layer;

1. a lithium strip unwinding roller; 11. a lithium band; 21. a first calendering auxiliary roll; 22. a second calendering auxiliary roll; 3. a calendering roll; 31. a first calender roll; 32. a second calender roll; 4. a coating mechanism; 41. a first coating mechanism; 42. a second coating mechanism; 50. a carrier film; 51. unwinding the roller; 52. a wind-up roll; 53. passing through a roller along the carrier pressing film; 3. a calendering roll; 6. a transfer roll; 7. a trimming and carding component; 71. the stripes are raised; 81. a pole piece unwinding roller; 82. pole piece wind-up roll.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The lithium replenishing device of the embodiment, referring to fig. 1 to 5, is used for coating a metal lithium film on a negative electrode plate 10 of a battery, and comprises: the device comprises a roller assembly, a first fixing device and a second fixing device, wherein the roller assembly comprises an unwinding roller 51 and a winding roller 52, a carrier film 50 is arranged between the unwinding roller 51 and the winding roller 52, and the carrier film 50 is used for loading a metal lithium film; carrier film 50 is wound on unwinding roll 51 and winding roll 52, and carrier film 50 is movably disposed to deliver the metallic lithium film to pole piece 10; the lithium belt unwinding roller 1 is wound with a lithium belt 11; a calender roll 3 for pressing the lithium tape 11 and the carrier film 50 to form a metallic lithium film on the carrier film 50; and the coating mechanism 4 is arranged between the lithium strip unwinding roller 1 and the calendering roller 3, and the coating mechanism 4 is used for coating a release agent on the lithium strip 11 so as to adjust the release force between the metal lithium film and the carrier film 50. Adopt above-mentioned setting, through calendering roller 3 with the metal lithium membrane on the lithium area 11 prolong to press to carrier film 50 on, coat the release agent through coating mechanism 4 on carrier film 50, thereby make metal lithium membrane and the laminating of carrier film 50, then, carrier film 50 can carry the metal lithium membrane to negative pole piece 10, in order to accomplish and mend lithium, whole process carrier film 50 only plays the effect of transportation, like this, alright with the reuse of carrier film 50, the problem of the high cost of lithium cell is mended to the mend lithium device among the prior art has been solved.

Referring to fig. 1 to 5, in the lithium replenishment device of the present embodiment, the reduction rolls 3 include a first reduction roll 31 and a second reduction roll 32, the first reduction roll 31 and the second reduction roll 32 are disposed downstream of the coating mechanism 4, and the distance between the first reduction roll 31 and the second reduction roll 32 is adjustably set to press the lithium ribbon 11 and the carrier film 50.

In the lithium replenishing device of the present embodiment, referring to fig. 1, one surface of the carrier film 50 has a carrier film side for carrying a metallic lithium film, and the other surface of the carrier film 50 has a rough surface side; the first reduction roll 31 is used for abutting against the carrier film side, and the second reduction roll 32 is used for abutting against the rough surface side; wherein, the first calendering roller 31 and the second calendering roller 32 are both rotatablely arranged, and the linear velocity of the first calendering roller 31 is 0.05 times to 0.5 times of the linear velocity of the second calendering roller 32. With the above arrangement, the metallic lithium film can be smoothly rolled onto the carrier film 50.

Referring to fig. 1 to 5, in the lithium supplement device of the present embodiment, the roller assembly includes: a first auxiliary calendering roller 21, the first auxiliary calendering roller 21 being disposed on a side of the first calendering roller 31 away from the second calendering roller 32, the first auxiliary calendering roller 21 being used to push the first calendering roller 31; a second reduction auxiliary roller 22, the second reduction auxiliary roller 22 being provided on a side of the second reduction roller 32 away from the first reduction roller 31, the second reduction auxiliary roller 22 being for pushing the second reduction roller 32; wherein, the value ranges of the first auxiliary calendering roll 21 and the second auxiliary calendering roll 22 are both 200mm to 500mm. By providing the first and second reduction auxiliary rolls 21 and 22, it is more convenient to adjust the pressure of the reduction rolls 3.

In the lithium replenishing apparatus of the present embodiment, referring to fig. 1, the coating mechanism 4 includes a first coating mechanism 41 provided opposite to the support film side and a second coating mechanism 42 provided opposite to the support film side; so that different kinds of release agents are coated on both sides of the metallic lithium on the carrier film side and the carrier film side, respectively, by the first coating mechanism 41 and the second coating mechanism 42. In this way, both sides of the carrier film are coated more conveniently.

In the lithium replenishing device of the present embodiment, referring to fig. 1 to 4, the roller assembly includes a transfer roller 6, the transfer roller 6 is disposed downstream of the coating mechanism 4, the transfer roller 6 is movably disposed with respect to the pole piece 10, and the carrier film 50 passes between the transfer roller 6 and the pole piece 10 to press the metal lithium film on the carrier film 50 onto the pole piece 10 by the transfer roller 6.

Referring to fig. 1 to 5, in the lithium replenishing device of the present embodiment, the roller diameter of the calendering roller 3 is smaller than that of the transfer roller 6; and/or the roll diameter of the calendering rolls 3 ranges from 100mm to 200mm; and/or the roll diameter of the transfer roll 6 ranges from 200mm to 500mm.

In the lithium supplement device of the present embodiment, referring to fig. 1 to 5, there are two roller assemblies, the two roller assemblies are disposed at intervals, and the transfer rollers 6 of the two roller assemblies are disposed opposite to each other, so as to transfer the lithium metal film to the opposite sides of the pole piece 10 through the transfer rollers 6 of the two roller assemblies. By adopting the arrangement, the efficiency of lithium supplement operation can be higher.

Referring to fig. 1, in the lithium replenishing device of the present embodiment, the lithium replenishing device further includes an edge-trimming mechanism, and the edge-trimming mechanism includes: two spaced apart carrier film passing rollers 53, the two carrier film passing rollers 53 being arranged downstream of the coating device 4; and the trimming and carding component 7 is arranged between the two carrier film passing rollers 53, and a plurality of stripe bulges 71, the stripe bulges 71 and the stripe bulges 71 are arranged on the trimming and carding component 7 at intervals along the preset direction.

By adopting the arrangement, the preparation and the pre-lithium of the strip-shaped ultrathin metal lithium can be realized.

In the lithium supplement device of the present embodiment, referring to fig. 1, the lithium supplement device further includes a pole piece unwinding roller 81 and a pole piece winding roller 82, and the pole piece 10 is wound on the pole piece unwinding roller 81 and the pole piece winding roller 82.

The lithium replenishing apparatus of the present embodiment is explained as follows:

when the device works, the lithium tape unwinding roller 51 releases a thick lithium tape (with the thickness of 1-2 mm) to enter between the two calendering rollers 3 to be calendered into an ultrathin lithium foil with the thickness of 2-10 microns, in order to realize the extension calendering of the lithium foil and attach the lithium foil to the carrier film 50 after extension, release agents are coated on the two sides of the metal lithium tape, the release force between the first surface of the metal lithium and the calendering rollers 3 is smaller than the release force between the second surface of the metal lithium and the carrier film 50 by adjusting the coating type, components and coating amount of the release agents, the lithium metal extends and adheres to the surface of the carrier film 50 under the action of the calendering rollers 3, the carrier films 50 on the two sides convey the loaded ultrathin metal lithium to the negative pole piece 10 between the two transfer rollers 6, the negative pole piece 10 is controlled to pass between the carrier films 50 loaded with the ultrathin metal lithium by the pole piece unwinding roller 81 and the pole piece winding roller 82, and the metal lithium on the surface of the carrier film 50 is transferred to the surface of the negative pole under the pressure of the transfer rollers 6, so as to finish the pre-lithium pre-lithiation of the negative pole piece 10.

The carrier film 50 may be made of a PET film, a PP film, a PE film, a stainless steel foil, or the like, and the carrier film 50 may be reused after being cleaned and dried.

Release agents are coated on two sides of the metal lithium, the release agents are selected from polymethylsiloxane and polyether, meanwhile, a conductive agent, lithium salt or a mixture of the conductive agent and the lithium salt can be added in the release agents, so that the release agents have ionic, electronic or mixed conductivity, the influence of the release agents on lithium ion diffusion is reduced, and the release force between the first surface of the metal lithium and the calendering roller 3 is smaller than the release force between the second surface of the metal lithium and the carrier film 50 by adjusting the components and the coating amount of the release agents.

The release agent coating mechanism of the second surface of the lithium metal can also be arranged on the surface of the carrier film 50.

In order to realize the preparation of the ultrathin metal lithium foil and avoid the extension of the negative pole piece 10 caused by the transfer process, the roller diameter of the calendering roller 3 is smaller than that of the transfer roller 6, the diameter of the calendering roller 3 is preferably 100-200mm, and the diameter of the transfer roller 6 is preferably 200-500mm;

in order to enhance the strength of the reduction roll 3 and increase the rolling force, auxiliary reduction rolls (i.e., a first auxiliary reduction roll 21 and a second auxiliary reduction roll 22) are further provided on the side of the reduction roll 3 remote from the lithium metal, and the increase in the rolling force is achieved by the pressing of the auxiliary reduction rolls, and the diameter of the auxiliary reduction rolls is preferably 200 to 500mm.

The metal lithium is rolled by controlling the distance and the pressure of the two rolling rolls 3, the rolling force of the two rolling rolls 3 is 5-20T, the transfer function is realized by controlling the distance and the pressure of the two transfer rolls 6, and the transfer pressure is 2-10T.

In order to roll the lithium foil, the two rolling rollers 3 have a linear velocity difference, the linear velocity of the rolling roller 3 on the opposite side of the carrier film 50 is less than that of the rolling roller 3 on the side of the carrier film 50, and the linear velocity ratio is 0.05-0.5.

In order to solve the problem of poor alignment of pole piece lithium supplement caused by sawteeth at the rolled edge of the ultrathin metal lithium, the front end of the transfer roller 6 is provided with an edge trimming mechanism, the edge trimming mechanisms are respectively arranged at the left side and the right side of the roller and used for scraping the ultrathin metal lithium with sawteeth at the edge, and the edge trimming mechanisms can be adjusted according to the requirement.

In order to improve the electrolyte infiltration effect of the pre-lithium pole piece, the lithium supplement mode can be stripe lithium supplement, for realizing the stripe lithium supplement, the surface of the transfer auxiliary roller can be designed with horizontal or vertical raised stripes, the metal lithium at the raised position corresponding to the auxiliary belt is transferred to the negative electrode under the action of pressure, and the metal lithium residue at other positions is taken away by the carrier film 50.

In order to realize the strip lithium supplement, a comb-shaped strip scraper mechanism can be arranged between the two trimming mechanisms to realize the preparation and the pre-lithium of strip ultrathin metal lithium, wherein the width of the strip lithium is 0 to 4mm, and the distance between the strip lithium is 0 to 4mm.

The pole piece structure of the present embodiment, referring to fig. 6, is prepared by the lithium supplement device, and includes a negative pole piece 10, a lithium metal supplement layer 20 is disposed on the surface of the pole piece 10, and the surface capacity of the lithium metal supplement layer 20 is 5% -30% of the surface capacity of the pole piece 10.

Specifically, the capacity of the pole piece surface = the density of the pole piece coating surface x the specific capacity of the pole piece, and the density of the pole piece coating surface is 6-13mg/cm ² The specific capacity of the pole piece is 300-700mAh/g, and the face capacity of the pole piece is 1.8-10mAh/cm ² 。

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

the utility model discloses a mend lithium device for on coating the negative pole piece 10 of battery with metal lithium membrane, mend lithium device and include: the device comprises a roller assembly, a first fixing device and a second fixing device, wherein the roller assembly comprises an unwinding roller 51 and a winding roller 52, a carrier film 50 is arranged between the unwinding roller 51 and the winding roller 52, and the carrier film 50 is used for loading a metal lithium film; the carrier film 50 is wound on an unwinding roller 51 and a winding roller 52, and the carrier film 50 is movably arranged to convey the lithium metal film to the pole piece 10; the lithium belt unwinding device comprises a lithium belt unwinding roller 1, wherein a lithium belt 11 is wound on the lithium belt unwinding roller 1; a calender roll 3 for pressing the lithium tape 11 and the carrier film 50 to form a metallic lithium film on the carrier film 50; and the coating mechanism 4 is arranged between the lithium strip unwinding roller 1 and the calendering roller 3, and the coating mechanism 4 is used for coating a release agent on the lithium strip 11 so as to adjust the release force between the metal lithium film and the carrier film 50. Adopt above-mentioned setting, through calendering roller 3 with the lithium metal film on the lithium area 11 prolong to carrier film 50 on, through coating mechanism 4 coating release agent on carrier film 50, thereby make the lithium metal film laminate with carrier film 50, then, carrier film 50 can carry the lithium metal film to negative pole piece 10, in order to accomplish and mend lithium, whole process carrier film 50 only plays the effect of transportation, like this, alright with carrying carrier film 50 reuse, the problem of the lithium device among the prior art of mending lithium to the lithium cell with high costs is solved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "above … …", "above … …", "above … … upper surface", "above", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It will be understood that the 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. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A lithium replenishment device for coating a metallic lithium film onto a negative electrode sheet (10) of a battery, the lithium replenishment device comprising:

a roller assembly, the roller assembly comprising:

an unwinding roller (51) and a winding roller (52), wherein a carrier film (50) is arranged between the unwinding roller (51) and the winding roller (52), and the carrier film (50) is used for loading the metal lithium film; the carrier film (50) is wound on the unwinding roller (51) and the winding roller (52), and the carrier film (50) is movably arranged to convey the metallic lithium film to the pole piece (10);

the lithium belt unwinding device comprises a lithium belt unwinding roller (1), wherein a lithium belt (11) is wound on the lithium belt unwinding roller (1);

a calender roll (3), wherein the calender roll (3) is used for extruding the lithium strip (11) and the carrier film (50) to form the metal lithium film on the carrier film (50);

coating mechanism (4), coating mechanism (4) set up between lithium area unreel roller (1) and calendering roller (3), coating mechanism (4) be used for to coating release agent on lithium area (11), in order to adjust the metal lithium membrane with from type force between carrier film (50).

2. The lithium replenishment device according to claim 1, characterized in that the reduction rolls (3) comprise a first reduction roll (31) and a second reduction roll (32), the first reduction roll (31) and the second reduction roll (32) being arranged downstream of the coating mechanism (4), the distance between the first reduction roll (31) and the second reduction roll (32) being adjustably arranged to press the lithium ribbon (11) and the carrier film (50).

3. The lithium replenishment device according to claim 2, characterized in that one side of the carrier film (50) has a carrier film side for carrying the metallic lithium film, and the other side of the carrier film (50) has a rough surface side; the first calendering roller (31) is used for abutting against the carrier film side, and the second calendering roller (32) is used for abutting against the rough surface side; wherein the first calendering roller (31) and the second calendering roller (32) are both rotatably arranged, and the linear velocity of the first calendering roller (31) is 0.05 times to 0.5 times of the linear velocity of the second calendering roller (32).

4. The lithium replenishing device according to claim 3, wherein the roller assembly comprises:

a first auxiliary calendering roller (21), wherein the first auxiliary calendering roller (21) is arranged on the side of the first calendering roller (31) far away from the second calendering roller (32), and the first auxiliary calendering roller (21) is used for pushing the first calendering roller (31);

a second auxiliary calendering roller (22), wherein the second auxiliary calendering roller (22) is arranged on the side of the second calendering roller (32) far away from the first calendering roller (31), and the second auxiliary calendering roller (22) is used for pushing the second calendering roller (32);

wherein the value ranges of the first auxiliary calendering roll (21) and the second auxiliary calendering roll (22) are both 200mm to 500mm.

5. The lithium replenishing device according to claim 3, wherein the coating mechanism (4) comprises a first coating mechanism (41) disposed opposite to the carrier film side and a second coating mechanism (42) disposed opposite to the carrier film side; so as to respectively coat different types of release agents on the two sides of the lithium metal on the side of the carrier film and the opposite side through the first coating mechanism (41) and the second coating mechanism (42).

6. The lithium replenishing device according to claim 1, characterized in that the roller assembly comprises a transfer roller (6), the transfer roller (6) is arranged downstream of the coating mechanism (4), the transfer roller (6) is movably arranged relative to the pole piece (10), and the carrier film (50) passes between the transfer roller (6) and the pole piece (10) to press the metallic lithium film on the carrier film (50) onto the pole piece (10) through the transfer roller (6).

7. The lithium replenishing device according to claim 6,

the roll diameter of the calendering roll (3) is smaller than that of the transfer roll (6); and/or the presence of a gas in the gas,

the roll diameter of the calendering roll (3) ranges from 100mm to 200mm; and/or the presence of a gas in the gas,

the roll diameter of the transfer roll (6) ranges from 200mm to 500mm.

8. The lithium supplementing device according to claim 6, wherein the number of the roller assemblies is two, the two roller assemblies are arranged at intervals, the transferring rollers (6) of the two roller assemblies are oppositely arranged, so that the transferring rollers (6) of the two roller assemblies transfer the lithium metal film to the two opposite sides of the pole piece (10).

9. The lithium supplement device of claim 1, further comprising an edging mechanism, the edging mechanism comprising:

two spaced-apart carrier film-following rollers (53), wherein the two carrier film-following rollers (53) are arranged downstream of the coating mechanism (4);

the trimming and carding component (7) is arranged between the two edge carrier film rollers (53), a plurality of stripe bulges (71) are arranged on the trimming and carding component (7), and the stripe bulges (71) are arranged at intervals along a preset direction.

10. The lithium replenishing device according to any one of claims 1 to 9, further comprising a pole piece unwinding roller (81) and a pole piece winding roller (82), wherein the pole piece (10) is wound on the pole piece unwinding roller (81) and the pole piece winding roller (82).

11. A pole piece structure prepared by the lithium supplement device of any one of claims 1 to 10, wherein the pole piece structure comprises a negative pole piece (10), a lithium metal supplement layer (20) is disposed on the surface of the pole piece (10), and the surface capacity of the lithium metal supplement layer (20) is 5% -30% of the surface capacity of the pole piece (10).

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