CN217955937U - Lithium supplement equipment and negative pole piece structure - Google Patents
Lithium supplement equipment and negative pole piece structure Download PDFInfo
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- CN217955937U CN217955937U CN202221233048.3U CN202221233048U CN217955937U CN 217955937 U CN217955937 U CN 217955937U CN 202221233048 U CN202221233048 U CN 202221233048U CN 217955937 U CN217955937 U CN 217955937U
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Abstract
The utility model provides a mend lithium equipment and negative pole piece structure, mend lithium equipment and include: a pole piece unwinding roller and a pole piece winding roller which can rotate and are arranged at intervals for unwinding and winding the negative pole piece P; two lithium tape unwinding rollers which are respectively and rotatably arranged on two opposite sides of the negative pole piece P to release the thick lithium tape L; the two calendaring transfer assemblies correspond to the two lithium strip unwinding rollers one by one, and each calendaring transfer assembly comprises a calendaring roller and a calendaring transfer roller which are positioned on two opposite sides of the corresponding thick lithium strip L and can be rotationally arranged so as to extrude the corresponding thick lithium strip L into an ultrathin lithium foil and transfer the ultrathin lithium foil onto the negative pole piece P; two coating mechanisms which correspond to the two lithium tape unwinding rollers one by one so as to coat the parting agent on two opposite sides of the corresponding thick lithium tape L; the two rejection membrane retracting and releasing assemblies correspond to the two calendering transfer assemblies one by one to retract and release the rejection membrane C between the corresponding calendering roller and the thick lithium belt L, so that the problem that the roller is easy to stick when the lithium replenishing device in the prior art replenishes lithium is solved.
Description
Technical Field
The utility model relates to a mend lithium technical field particularly, relates to a mend lithium equipment and negative 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 for consumer electronic batteries and new energy automobile power batteries.
However, lithium loss caused by the formation of a solid electrolyte membrane (namely an SEI film) in the first charge and discharge process of an electrode material of a lithium ion battery limits the exertion of the energy density of the lithium ion battery, which is particularly obvious in a silicon-based negative electrode material system, and active lithium loss caused by side reactions in the cycle process also causes the shortening of the cycle life.
The utility model discloses a utility model patent with publication number CN210805916U discloses a lithium device is mended to pole piece, realizes the calendering to metal lithium through coating emollient to metal lithium both sides, however, this kind of method requires the height to both sides emollient coating, easily takes place the roll sticking problem, and the practicality is lower.
The invention patent with publication number CN105845896B discloses a split-calendaring disposable film-covering lithium-supplementing device, which needs to consume twice the area of a carrier film of a pole piece in the lithium-supplementing process, and the carrier film cannot be reused, so that the lithium-supplementing cost is too high.
SUMMERY OF THE UTILITY MODEL
A primary object of the utility model is to provide a mend lithium equipment and negative pole piece structure to the problem of roller sticking easily takes place when mending lithium of the benefit lithium device among the solution prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a lithium replenishing apparatus including: the pole piece unwinding roller and the pole piece winding roller are arranged at intervals and can rotate so as to unwind and wind the negative pole piece P; the two lithium belt unwinding rollers are respectively positioned at two opposite sides of the negative pole piece P, and each lithium belt unwinding roller is rotatably arranged to release the thick lithium belt L; the two calendaring transfer assemblies are arranged in one-to-one correspondence with the two lithium strip unwinding rollers, each calendaring transfer assembly comprises a calendaring roller and a calendaring transfer roller which are positioned at two opposite sides of the corresponding thick lithium strip L and can be rotationally arranged, and each calendaring roller is positioned at one side of the corresponding calendaring transfer roller, which is far away from the negative pole piece P, so as to extrude the corresponding thick lithium strip L into an ultrathin lithium foil and transfer the ultrathin lithium foil onto the negative pole piece P; the two coating mechanisms are arranged in one-to-one correspondence with the two lithium tape unwinding rollers, and each coating mechanism is arranged on the motion path of the corresponding thick lithium tape L so as to coat the parting agent on the two opposite sides of the corresponding thick lithium tape L; the two rejection membrane winding and unwinding assemblies are arranged in one-to-one correspondence with the two calendering transfer assemblies, and each rejection membrane winding and unwinding assembly is used for winding and unwinding a rejection membrane C between a corresponding calendering roller and a thick lithium belt L.
Further, the external diameter of the calendering roller is smaller than that of the calendering transfer roller; and/or the outer diameter of the calendering roll is in the range of 100mm to 200mm; and/or the outer diameter of the calendering transfer roller is in a range of 200mm to 500mm; and/or the linear speed of rotation of the calendering roll is less than the linear speed of rotation of the calendering transfer roll.
Further, the repellent film C is a PET film, or a PP film, or a PE film, or a stainless steel foil; and/or the outer surface of the repellent film C is coated with a release agent.
Further, the lithium supplementing device also comprises a calendering auxiliary roller which is arranged on one side of the calendering roller far away from the calendering transfer roller so as to apply pressure to the calendering roller to increase the calendering force of the calendering roller on the thick lithium strip L.
Further, the outer diameter of the calendering auxiliary roll is in a range of 200mm to 500mm.
Further, each coating mechanism includes a calendering-side coating part and a calendering-transfer-side coating part, which are respectively located on opposite sides of the corresponding thick lithium ribbon L to respectively coat the release agent to the opposite sides of the thick lithium ribbon L, the calendering-side coating part being located on a side of the corresponding thick lithium ribbon L close to the corresponding calender roll, and the calendering-transfer-side coating part being located on a side of the corresponding thick lithium ribbon L close to the corresponding calender transfer roll.
Furthermore, the release agent comprises at least one of polymethylsiloxane and polyether release agents, and a conductive agent is added into the release agent so as to improve the utilization rate of the metal lithium.
Further, the release agent comprises a conductive agent, and the conductive agent is at least one of conductive carbon black, acetylene black, ketjen black, furnace black, artificial graphite and natural graphite.
Furthermore, the lithium supplementing device further comprises a rolling transfer roller cleaning mechanism, the rolling transfer roller cleaning mechanism comprises a scraper and a suction nozzle, the scraper and the suction nozzle are arranged towards the surface of the rolling transfer roller, the scraper is used for scraping residual metal lithium residues on the surface of the rolling transfer roller, and the suction nozzle is used for sucking away the metal lithium residues scraped by the scraper.
Further, the lithium replenishing equipment further comprises a repairing mechanism arranged towards the outer surface of the rolling transfer roller, and the repairing mechanism comprises: the two trimming mechanisms are arranged at intervals along the axial direction of the calendering transfer roller and are respectively close to the two side edges of the ultrathin lithium foil so as to scrape the sawtooth-shaped parts at the two side edges of the ultrathin lithium foil; and the comb-shaped stripe scraper mechanism is arranged between the two trimming mechanisms so as to repair the ultrathin lithium foil into a stripe-shaped structure.
According to another aspect of the present invention, a negative electrode plate structure is provided, the negative electrode plate structure is prepared by the above lithium supplement device, and the negative electrode plate structure comprises a plate main body and two lithium supplement layers respectively located at two opposite sides of the plate main body; wherein, the surface capacity of the lithium supplement layer is 5 to 30 percent of the surface capacity of the pole piece main body.
Use the technical scheme of the utility model, the utility model provides a mend lithium equipment, include: the negative pole piece winding and unwinding device comprises a pole piece unwinding roller and a pole piece winding roller which are arranged at intervals, wherein the pole piece unwinding roller and the pole piece winding roller are both rotatably arranged so as to unwind and wind a negative pole piece P; two lithium belt unwinding rollers which are respectively positioned at two opposite sides of the negative pole piece P, and each lithium belt unwinding roller is rotatably arranged to release the thick lithium belt L; the two calendering transfer assemblies are arranged in one-to-one correspondence with the two lithium strip unwinding rollers, each calendering transfer assembly comprises a rotatable calendering roller and a calendering transfer roller which are positioned at two opposite sides of the corresponding thick lithium strip L, and each calendering roller is positioned at one side of the corresponding calendering transfer roller, which is far away from the negative pole piece P, so as to extrude the corresponding thick lithium strip L into an ultrathin lithium foil and transfer the ultrathin lithium foil onto the negative pole piece P; the two coating mechanisms are arranged in one-to-one correspondence with the two lithium tape unwinding rollers, and each coating mechanism is arranged on the motion path of the corresponding thick lithium tape L so as to coat the parting agent on the two opposite sides of the corresponding thick lithium tape L; the two rejection membrane winding and unwinding assemblies are arranged in one-to-one correspondence with the two calendering transfer assemblies, and each rejection membrane winding and unwinding assembly is used for winding and unwinding a rejection membrane C between a corresponding calendering roller and a thick lithium belt L. Therefore, the utility model discloses a mend lithium equipment has realized through the relative both sides surface coating release agent at thick lithium area L to the nimble control from the type force, has improved control accuracy to mode through increasing between calendering roller and thick lithium area L and repelling membrane C has realized stable benefit lithium effect, has solved the problem that mends the lithium device among the prior art and easily takes place the roller when mending lithium.
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 apparatus according to the present invention;
fig. 2 shows and utilizes the utility model discloses a mend lithium and establish the structural schematic diagram of negative pole piece structure after mending lithium to the negative pole piece.
Wherein the figures include the following reference numerals:
1. a lithium strip unwinding roller; 2. calendering auxiliary rollers; 3. a calendering roll; 31. a repellent film unwinding mechanism; 32. a rejection membrane winding mechanism; 4. a calendering transfer roll; 51. a calender side coated member; 52. calendering the transfer side coated member; 6. a calendering transfer roller cleaning mechanism; 7. a repair mechanism; 81. a pole piece unwinding roller; 82. a pole piece wind-up roll;
10. a pole piece main body; 20. and (5) supplementing lithium.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments 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.
As shown in fig. 1, the utility model provides a mend lithium equipment, include: the pole piece unwinding roller 81 and the pole piece winding roller 82 are arranged at intervals, and the pole piece unwinding roller 81 and the pole piece winding roller 82 are both rotatably arranged to unwind and wind the negative pole piece P; the two lithium belt unwinding rollers 1 are respectively positioned at two opposite sides of the negative pole piece P, and each lithium belt unwinding roller 1 is rotatably arranged to release the thick lithium belt L; the two calendering transfer assemblies are arranged in one-to-one correspondence with the two lithium strip unwinding rollers 1, each calendering transfer assembly comprises a calendering roller 3 and a calendering transfer roller 4 which are positioned at two opposite sides of the corresponding thick lithium strip L and can be rotatably arranged, and each calendering roller 3 is positioned at one side of the corresponding calendering transfer roller 4 far away from the negative pole piece P so as to extrude the corresponding thick lithium strip L into an ultrathin lithium foil and transfer the ultrathin lithium foil onto the negative pole piece P; the two coating mechanisms are arranged in one-to-one correspondence with the two lithium tape unwinding rollers 1, and each coating mechanism is arranged on the motion path of the corresponding thick lithium tape L so as to coat a release agent on two opposite sides of the corresponding thick lithium tape L; the two rejection membrane winding and unwinding assemblies are arranged in one-to-one correspondence with the two calendering transfer assemblies, and each rejection membrane winding and unwinding assembly is used for winding and unwinding a rejection membrane C between the corresponding calendering roller 3 and the thick lithium belt L.
Therefore, the utility model discloses a mend lithium equipment has realized through the relative both sides surface coating release agent at thick lithium area L to the nimble control from the type force, has improved control accuracy to mode through increasing between calender roll 3 and thick lithium area L and repelling membrane C has realized stable benefit lithium effect, has solved the problem that mends the lithium device among the prior art and easily takes place the roller when mending lithium.
Specifically, each calendering transfer assembly is located on one side of the corresponding lithium-strip unwinding roller 1 close to the pole-piece unwinding roller 81, and the moving direction of the portion of each thick lithium strip L located between the corresponding lithium-strip unwinding roller 1 and the corresponding calendering transfer assembly is opposite to the moving direction of the portion of the negative pole piece located between the pole-piece unwinding roller 81 and the pole-piece winding roller 82.
In order to realize the preparation of the ultrathin lithium foil and avoid the further extension of the negative electrode sheet P caused by the ultrathin lithium foil in the transfer process, the outer diameter of the calendering roller 3 needs to be smaller than that of the calendering transfer roller 4.
Preferably, the outer diameter of the calender roll 3 ranges from 100mm to 200mm; and/or the outer diameter of the calendering transfer roll 4 ranges from 200mm to 500mm.
In order to roll the thick lithium ribbon L, the linear speed of rotation of the reduction roll 3 needs to be made smaller than the linear speed of rotation of the reduction transfer roll 4.
Preferably, the ratio of the rotational linear velocity of the reduction roll 3 to the rotational linear velocity of the reduction transfer roll 4 is 0.05 to 0.2.
Optionally, the repellent film C is a PET film, or a PP film, or a PE film, or a stainless steel foil; and/or the outer surface of the repellent film C is coated with a release agent.
Specifically, each rejection membrane winding and unwinding assembly comprises a rejection membrane unwinding mechanism 31 and a rejection membrane winding mechanism 32, the rejection membrane unwinding mechanism 31 is positioned at one side of the corresponding calendering roller 3 close to the corresponding lithium strip unwinding roller 1, and the rejection membrane winding mechanism 32 is positioned at one side of the corresponding calendering roller 3 far away from the corresponding lithium strip unwinding roller 1, so that the unwinding and winding actions of the rejection membrane C are realized through the rejection membrane unwinding mechanism 31 and the rejection membrane winding mechanism 32; when the repellent film C on the repellent film unwinding mechanism 31 is used up, the repellent film C on the repellent film winding mechanism 32 can be remounted on the repellent film unwinding mechanism 31 to realize reuse; in addition, the rejection membrane C may be cleaned with a solvent and reused.
As shown in fig. 1, the lithium replenishing apparatus further includes a reduction auxiliary roll 2, and the reduction auxiliary roll 2 is disposed on a side of the reduction roll 3 away from the reduction transfer roll 4 to apply pressure to the reduction roll 3 to increase the strength of the reduction roll 3 to increase the reduction force of the reduction roll 3 on the thick lithium ribbon L.
Preferably, the outer diameter of the calendering auxiliary roll 2 ranges from 200mm to 500mm.
As shown in fig. 1, each coating mechanism includes a calendering-side coating part 51 and a calendering-transfer-side coating part 52 which are respectively located on opposite sides of the corresponding thick lithium ribbon L to respectively coat the release agent to the opposite sides of the thick lithium ribbon L, the calendering-side coating part 51 being located on a side of the corresponding thick lithium ribbon L adjacent to the corresponding calendering roll 3, and the calendering-transfer-side coating part 52 being located on a side of the corresponding thick lithium ribbon L adjacent to the corresponding calendering transfer roll 4.
Specifically, the utility model discloses a mend the type, composition and the coating amount etc. of the release agent that the relative both sides of lithium equipment accessible control thick lithium area L were coated, make ultra-thin lithium paper tinsel and corresponding calendering transfer roller 4 between be greater than ultra-thin lithium paper tinsel and corresponding rejection membrane C from the type power to when the realization was prepared the calendering of ultra-thin lithium paper tinsel, make ultra-thin lithium paper tinsel can separate and the adhesion at the calendering transfer roller 4 with rejection membrane C.
Optionally, the release agent includes at least one of a polymethylsiloxane release agent and a polyether release agent, and a conductive agent is added in the release agent to improve the utilization rate of the metal lithium.
Alternatively, the conductive agent is at least one of conductive carbon black, acetylene black, ketjen black, furnace black, artificial graphite, and natural graphite, and has a conductive carbon content of 0% to 50%.
As shown in fig. 1, the lithium supplementing device further comprises a rolling transfer roll cleaning mechanism 6, wherein the rolling transfer roll cleaning mechanism 6 comprises a scraper and a suction nozzle, the scraper and the suction nozzle are arranged towards the surface of the rolling transfer roll 4, the scraper is used for scraping the residual lithium metal residues on the surface of the rolling transfer roll 4, and the suction nozzle is used for sucking away the residual lithium metal residues scraped by the scraper.
As shown in fig. 1, the lithium replenishing apparatus further includes a repair mechanism 7 provided toward the outer surface of the reduction transfer roll 4, the repair mechanism 7 including: the two trimming mechanisms are arranged at intervals along the axial direction of the calendering transfer roller 4 and are respectively close to the two side edges of the ultrathin lithium foil so as to scrape the sawtooth-shaped parts at the two side edges of the ultrathin lithium foil, so that the problem of poor alignment degree of lithium supplement of a pole piece caused by the sawtooth at the calendering edge of the metal lithium is solved, and the alignment degree of lithium supplement is improved; the comb-shaped stripe scraper mechanism is arranged between the two trimming mechanisms to repair the ultrathin lithium foil into a stripe structure, so that the preparation and pre-lithium of the stripe ultrathin lithium foil are realized, the stripe lithium supplement of the negative pole piece P is realized, and the electrolyte infiltration effect of the pre-lithium pole piece is improved.
Specifically, in the stripe structure of the ultra-thin lithium foil, the width of each stripe ranges from 0mm to 4mm, and the distance between any two adjacent stripes ranges from 0mm to 4mm.
Specifically, the position of the deburring mechanism may be adjusted as desired.
When the lithium supplementing device works, each lithium strip unwinding roller 1 releases a thick lithium strip L with the thickness of 1mm to 2mm to reach a calendering station between the corresponding calendering roller 3 and the calendering transfer roller 4, so that the lithium strip L is calendered into an ultrathin lithium foil with the thickness of 2 mu m to 10 mu m; in order to realize the extension calendering of the metal lithium and the attachment of the metal lithium to a transfer side after the extension, release agents are coated on the surfaces of two sides of a thick lithium belt L, the release force between each ultrathin lithium foil and the outer surface of the corresponding calendering transfer roller 4 is larger than the release force between each ultrathin lithium foil and the outer surface of the corresponding rejection membrane C by adjusting the type, components and coating amount of the release agents coated on the two opposite sides of each thick lithium belt L, so that the lithium is completely pasted on the corresponding calendering transfer roller 4, and the ultrathin lithium foil is conveyed to a transfer station at the position of a negative pole piece P under the rotation of the corresponding calendering roller 3 and the corresponding calendering transfer roller 4; the negative pole piece P is passed through between two calendering transfer rollers 4 that set up relatively that are stained with ultra-thin lithium paper tinsel by pole piece unreeling roll 81 and pole piece wind-up roll 82 coact, and the ultra-thin lithium paper tinsel that is located on these two calendering transfer rollers 4 shifts to the relative both sides surface of negative pole piece P from the surface of these two calendering transfer rollers 4 respectively under the effect of pressure to the realization is to the two-sided lithium function of mending of negative pole piece P, in order to form negative pole piece structure.
As shown in fig. 1, the direction indicated by the arrow near the negative electrode tab P is the moving direction of the negative electrode tab P, the direction indicated by the arrow near each thick lithium stripe L is the moving direction of the corresponding thick lithium stripe L, and the direction indicated by the arrow near each repellent film C is the moving direction of the corresponding repellent film C.
In order to realize the utility model discloses a six-roller calendering transfer function of lithium supplementing equipment, need to make the fixed position of the first calendering transfer roller 4 in two calendering transfer rollers 4 motionless, with the first calendering roller 3 that first calendering transfer roller 4 that should be motionless is corresponding with the position of first calendering auxiliary roll 2 all adjustably set up, with control the calendering force through controlling the interval and the pressure between first calendering roller 3 and the first calendering transfer roller 4, in order to realize corresponding calendering function, wherein, the relative position of first calendering roller 3 and first calendering auxiliary roll 2 is fixed, in order to adjust in step; the positions of the second calendering transfer roll 4 and the second calendering roll 3 and the second calendering auxiliary roll 2 corresponding to the second calendering transfer roll 4 are both adjustably set so as to control the transfer force by adjusting the spacing and pressure between the two calendering transfer rolls 4 to realize respective transfer functions, and control the calendering force by adjusting the spacing and pressure between the second calendering roll 3 and the second calendering transfer roll 4 to realize corresponding calendering functions, wherein the relative positions of the second calendering roll 3 and the second calendering auxiliary roll 2 are fixed so as to be synchronously adjusted.
Specifically, the rolling force ranges from 5T to 20T, and the transfer force ranges from 2T to 10T.
As shown in fig. 2, the utility model also provides a negative pole piece structure, which is prepared by the lithium supplement device and comprises a pole piece main body 10 and two lithium supplement layers 20 respectively located at two opposite sides of the pole piece main body 10; wherein, the surface capacity of the lithium supplement layer 20 is 5 to 30 percent of the surface capacity of the pole piece main body 10.
Specifically, the surface capacity of the pole piece main body 10 = the coating surface density of the pole piece main body 10 × the specific capacity of the pole piece main body 10, and the value range of the coating surface density of the pole piece main body 10 is 6mg/cm 2 To 13mg/cm 2 And the value range of the specific capacity of the pole piece main body 10 is 300Ah/g to 700mAh/g, namely the value range of the surface capacity of the pole piece main body 10 is 1.8mAh/cm 2 To 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 provides a mend lithium equipment, include: the pole piece unwinding roller 81 and the pole piece winding roller 82 are arranged at intervals, and the pole piece unwinding roller 81 and the pole piece winding roller 82 are both rotatably arranged to unwind and wind the negative pole piece P; the two lithium belt unwinding rollers 1 are respectively positioned at two opposite sides of the negative pole piece P, and each lithium belt unwinding roller 1 is rotatably arranged to release the thick lithium belt L; the two calendering transfer assemblies are arranged in one-to-one correspondence with the two lithium strip unwinding rollers 1, each calendering transfer assembly comprises a calendering roller 3 and a calendering transfer roller 4 which are positioned at two opposite sides of the corresponding thick lithium strip L and can rotate, and each calendering roller 3 is positioned at one side of the corresponding calendering transfer roller 4, which is far away from the negative pole piece P, so that the corresponding thick lithium strip L is extruded into an ultrathin lithium foil and transferred onto the negative pole piece P; the two coating mechanisms are arranged in one-to-one correspondence with the two lithium tape unwinding rollers 1, and each coating mechanism is arranged on the motion path of the corresponding thick lithium tape L so as to coat a release agent on two opposite sides of the corresponding thick lithium tape L; the two rejection membrane winding and unwinding assemblies are arranged in one-to-one correspondence with the two calendering transfer assemblies, and each rejection membrane winding and unwinding assembly is used for winding and unwinding a rejection membrane C between the corresponding calendering roller 3 and the thick lithium belt L. Therefore, the utility model discloses a mend lithium equipment has realized through the relative both sides surface coating release agent at thick lithium area L to the nimble control from the type force, has improved control accuracy to mode through increasing between calender roll 3 and thick lithium area L and repelling membrane C has realized stable benefit lithium effect, has solved the problem that mends the lithium device among the prior art and easily takes place the roller when mending lithium.
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, it need not be discussed further in subsequent figures.
In the description of the present application, it is to be understood that the directions or positional relationships 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 directions or positional relationships shown in the drawings, and are 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 construed 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 "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature 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 terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; 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, so that the scope 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 (9)
1. A lithium replenishing device, characterized by comprising:
the device comprises a pole piece unwinding roller (81) and a pole piece winding roller (82) which are arranged at intervals, wherein the pole piece unwinding roller (81) and the pole piece winding roller (82) are both rotatably arranged to unwind and wind a negative pole piece P;
the two lithium strip unwinding rollers (1) are respectively positioned at two opposite sides of the negative pole piece P, and each lithium strip unwinding roller (1) is rotatably arranged to release a thick lithium strip L;
the two calendering transfer assemblies are arranged in one-to-one correspondence with the two lithium strip unwinding rollers (1), each calendering transfer assembly comprises a calendering roller (3) and a calendering transfer roller (4) which are positioned at two opposite sides of the corresponding thick lithium strip L and can be rotatably arranged, and each calendering roller (3) is positioned at one side of the corresponding calendering transfer roller (4) far away from the negative pole piece P so as to extrude the corresponding thick lithium strip L into an ultrathin lithium foil and transfer the ultrathin lithium foil onto the negative pole piece P;
the two coating mechanisms are arranged in one-to-one correspondence with the two lithium strip unwinding rollers (1), and each coating mechanism is arranged on a movement path of the corresponding thick lithium strip L so as to coat a parting agent on two opposite sides of the corresponding thick lithium strip L;
the two rejection membrane retracting assemblies are arranged in one-to-one correspondence with the two calendering transfer assemblies, and each rejection membrane retracting assembly is used for retracting a rejection membrane C located between the corresponding calendering roller (3) and the thick lithium strip L.
2. The lithium replenishment device according to claim 1,
the outer diameter of the calendering roller (3) is smaller than that of the calendering transfer roller (4); and/or
The range of the outer diameter of the calendering roller (3) is 100mm to 200mm; and/or
The outer diameter of the calendering transfer roller (4) ranges from 200mm to 500mm; and/or
The rotating linear speed of the calendering roller (3) is less than that of the calendering transfer roller (4).
3. The lithium replenishing device according to claim 1,
the rejection film C is a PET film, a PP film, a PE film or a stainless steel foil; and/or
The outer surface of the repellent film C is coated with a release agent.
4. The lithium supplementing device according to any one of claims 1 to 3, further comprising a calendering auxiliary roller (2), wherein the calendering auxiliary roller (2) is arranged on the side of the calendering roller (3) far away from the calendering transfer roller (4) to apply pressure to the calendering roller (3) so as to increase the calendering force of the calendering roller (3) on the thick lithium strip L.
5. The lithium supplementing device according to claim 4, wherein the outer diameter of the auxiliary calendering roll (2) ranges from 200mm to 500mm.
6. The lithium replenishing apparatus according to any one of claims 1 to 3, wherein each of the coating mechanisms comprises a calendering-side coating member (51) and a calendering-transfer-side coating member (52) respectively located on opposite sides of the corresponding thick lithium ribbon L to respectively coat a release agent to the opposite sides of the thick lithium ribbon L, the calendering-side coating member (51) being located on a side of the corresponding thick lithium ribbon L close to the corresponding calendering roll (3), and the calendering-transfer-side coating member (52) being located on a side of the corresponding thick lithium ribbon L close to the corresponding calendering transfer roll (4).
7. The lithium supplementing device according to any one of claims 1 to 3, further comprising a rolling transfer roll cleaning mechanism (6), wherein the rolling transfer roll cleaning mechanism (6) comprises a scraper and a suction nozzle, the scraper is arranged towards the surface of the rolling transfer roll (4) and is used for scraping residual lithium metal residues on the surface of the rolling transfer roll (4), and the suction nozzle is used for sucking away the residual lithium metal residues scraped by the scraper.
8. The lithium replenishing device according to any one of claims 1 to 3, further comprising a repair mechanism (7) provided toward an outer surface of the reduction transfer roll (4), the repair mechanism (7) comprising:
the two trimming mechanisms are arranged at intervals along the axial direction of the calendering transfer roller (4) and are respectively close to the two side edges of the ultrathin lithium foil so as to scrape the sawtooth-shaped parts at the two side edges of the ultrathin lithium foil;
and the comb-shaped strip scraper mechanism is arranged between the two trimming mechanisms so as to repair the ultrathin lithium foil into a strip-shaped structure.
9. A negative electrode pole piece structure, characterized in that the negative electrode pole piece structure is prepared by the lithium supplement apparatus of any one of claims 1 to 8, and comprises a pole piece main body (10) and two lithium supplement layers (20) respectively located at two opposite sides of the pole piece main body (10); wherein the surface capacity of the lithium supplement layer (20) is 5 to 30 percent of the surface capacity of the pole piece main body (10).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116646625A (en) * | 2023-05-29 | 2023-08-25 | 纳科诺尔智能装备(深圳)有限公司 | Integrated lithium supplementing equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116646625A (en) * | 2023-05-29 | 2023-08-25 | 纳科诺尔智能装备(深圳)有限公司 | Integrated lithium supplementing equipment |
| CN116646625B (en) * | 2023-05-29 | 2024-03-05 | 纳科诺尔智能装备(深圳)有限公司 | Integrated lithium supplementing equipment |
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