CN114744144A - Composite negative plate lithium supplementing device and lithium supplementing method - Google Patents

Abstract

The application relates to a lithium supplementing device and a lithium supplementing method for a composite negative plate, relates to the field of lithium ion battery manufacturing equipment, and is mainly applied to a lithium strip calendering and pasting production line. In the related art, a cathode plate with one unit length needs to be matched with a protective film with four unit lengths for auxiliary processing, and a roller transportation structure needs to be additionally designed, so that the processing cost is high. When among this technical scheme utmost point piece unwinding mechanism transmits out and send into two-sided lithium and press and cover the mechanism, A face lithium area and B face lithium area are also transmitted out and get into two-sided lithium simultaneously and press and cover the mechanism by A face lithium unwinding mechanism and B face lithium unwinding mechanism, thereby directly press and cover to two-sided lithium membrane negative pole piece, rethread pole piece winding mechanism carries out the rolling, the use of protection film has been reduced, make the structure that this lithium device is mended to compound negative pole piece compacter, thereby reduce the cost that the lithium in-process was mended to the negative pole piece.

Description

Composite negative plate lithium supplementing device and lithium supplementing method

Technical Field

The application relates to the field of lithium ion battery manufacturing equipment, in particular to a composite negative plate lithium supplementing device and a lithium supplementing method.

Background

When the lithium ion battery is charged and discharged for the first time, the electrode material and the electrolyte react on a solid-liquid interface to form a Solid Electrolyte Interface (SEI) film covering the surface of the electrode material. The SEI film consumes lithium ions in a part of the cathode material during the production process, thereby irreversibly causing a decrease in energy density of the lithium ion battery. In order to improve the problem, in the production process of the lithium ion battery, a layer of metal lithium film is coated on the surface of the negative electrode plate in advance, so that the metal lithium on the negative electrode material can lose electrons and be oxidized into lithium ions to return to the positive electrode material in the discharging process, thereby compensating the loss of the lithium ions of the positive electrode material and improving the energy density of the lithium ion battery.

The prior art discloses a calendering mechanism and a pole piece lithium supplementing device aiming at process equipment for pressing and covering a metal lithium film on the surface of a negative pole piece in advance, wherein the publication number is CN207038626U, and the publication number is 2018, 02, 23 and the publication number is 2018.

According to the technical means, in the process of lithium supplement of the negative pole piece, the negative pole piece with one unit length needs to be matched with the protective film with four unit lengths for auxiliary processing, and in order to be matched with the protective film with four unit lengths for corresponding transportation, a roller transportation structure needs to be additionally designed, so that the processing cost is high.

Disclosure of Invention

In order to reduce the cost of the negative plate in the lithium supplementing process, the application provides a composite negative plate lithium supplementing device and a lithium supplementing method.

In a first aspect, the composite negative plate lithium supplement device provided by the application adopts the following technical scheme.

A lithium device is mended to compound negative pole piece, includes:

installing a frame;

the pole piece unwinding mechanism is used for accommodating the smooth negative pole winding drum and transmitting the smooth negative pole pieces through the transmission roller, and is arranged on the mounting rack;

the surface A lithium unwinding mechanism is used for accommodating a surface A lithium winding drum and transmitting a surface A lithium belt in the surface A lithium winding drum through a transmission roller, and the surface A lithium unwinding mechanism is arranged on the mounting rack;

the B surface lithium unwinding mechanism is used for accommodating a B surface lithium winding drum and transmitting a B surface lithium belt in the B surface lithium winding drum through a transmission roller, and the B surface lithium unwinding mechanism is arranged on the mounting rack;

the double-sided lithium covering mechanism is used for receiving the smooth negative plate in the pole piece unreeling mechanism, the A-side lithium belt in the A-side lithium unreeling mechanism and the B-side lithium belt in the B-side lithium unreeling mechanism and rolling and covering the smooth negative plate, the A-side lithium belt and the B-side lithium belt to form a double-sided lithium film negative plate, and the double-sided lithium covering mechanism is arranged on the mounting rack;

and the pole piece winding mechanism is used for winding the double-sided lithium film negative pole piece, and the pole piece winding mechanism is arranged on the installation rack.

Through adopting above-mentioned technical scheme, pole piece unwinding mechanism transmits out and send into two-sided lithium and press when covering the mechanism, A face lithium area and B face lithium area also are transmitted out and get into two-sided lithium simultaneously and press and cover the mechanism by A face lithium unwinding mechanism and B face lithium unwinding mechanism, thereby directly press and cover to two-sided lithium membrane negative pole piece, rethread pole piece winding mechanism carries out the rolling, compare in conventional technical scheme, the negative pole piece of unit length need cooperate four unit length protection films to carry out the auxiliary processing, and need additionally to design roller transport structure, thereby lead to the processing cost on the high side. According to the technical scheme, the use of the protective film is reduced, so that the structure of the composite negative plate lithium supplement device is more compact, and the cost of the negative plate lithium supplement process is reduced.

Optionally, the lithium supplementing device for the composite negative plate further includes:

the first back film unwinding mechanism is used for accommodating a first back film winding drum and transmitting a first protection film in the first back film winding drum through a transmission roller, the first back film unwinding mechanism is arranged on the installation rack, and the first protection film is positioned on the side face, away from the smooth-face negative plate, of the A-face lithium belt and enters the double-face lithium press mechanism along with the A-face lithium belt;

the first back film winding mechanism is used for receiving and winding the first protection film transmitted from the double-sided lithium press-coating mechanism;

the second back film unwinding mechanism is used for accommodating a second back film winding drum and transmitting a second protective film in the second back film winding drum through a transmission roller, the second back film unwinding mechanism is arranged on the installation rack, and the second protective film is positioned on the side face, away from the smooth negative plate, of the B-face lithium belt and enters the double-face lithium press-coating mechanism along with the B-face lithium belt;

and the second back film winding mechanism is used for receiving and winding the second protective film transmitted from the double-sided lithium press covering mechanism.

By adopting the technical scheme, the first protection film is positioned on the side face of the A-face lithium belt far away from the smooth-face negative plate and enters the double-face lithium pressing mechanism along with the A-face lithium belt, and then the first protection film transmitted from the double-face lithium pressing mechanism is wound by the first back film winding mechanism, so that when the double-face lithium pressing mechanism presses and covers the A-face lithium belt on one face of the smooth-face negative plate, the first protection film can protect the surface of the A-face lithium belt far away from the side of the smooth-face negative plate, and the problem that the A-face lithium belt is scratched by the compression roller is solved; the second protection film is located the side that the plain noodles negative pole piece place was kept away from in B face lithium area and follows the B face lithium area and get into two-sided lithium simultaneously and press and cover the mechanism, again by the rolling mechanism of second notacoria to two-sided lithium press cover the mechanism in the second protection film that transmits out roll, so that two-sided lithium is pressed and is covered the mechanism and when covering the plain noodles that closes the plain noodles negative pole piece with B face lithium area calendering, the surface that plain noodles negative pole piece place side was kept away from in the second protection film can protect B face lithium area, improve the problem that B face lithium area was by the compression roller fish tail.

Optionally, the double-sided lithium pressing mechanism comprises a rolling main body frame, an a-side extrusion roller, an a-side lithium-binding roller, a B-side extrusion roller and a B-side lithium-binding roller are rotatably arranged in the rolling main body frame, and the a-side lithium-binding roller and the B-side lithium-binding roller are both positioned between the a-side extrusion roller and the B-side extrusion roller; a first rolling space for rolling the lithium tape on the surface A is arranged between the squeezing roller on the surface A and the lithium-sticking roller on the surface A, and a second rolling space for rolling the lithium tape on the surface B is arranged between the squeezing roller on the surface B and the lithium-sticking roller on the surface B; and a laminating space for laminating the pressed A-side lithium belt, the polished negative plate and the pressed B-side lithium belt is arranged between the A-side lithium-sticking roller and the B-side lithium-sticking roller.

By adopting the technical scheme, the A surface lithium strip is rolled by the A surface squeeze roll and the A surface lithium sticking roll, the B surface lithium strip is rolled by the B surface squeeze roll and the B surface lithium sticking roll, and then the A surface lithium strip after rolling, the smooth surface negative plate and the B surface lithium strip after rolling are laminated by the A surface lithium sticking roll and the B surface lithium sticking roll, so that the use of a protective film is reduced, and the cost of the negative plate in the lithium supplementing process is reduced.

4. A composite negative pole piece lithium supplementing device according to claim 3, wherein an A surface supporting back roller tangent to the peripheral surface of the A surface pressing roller is arranged on the side of the A surface pressing roller far away from the A surface lithium adhering roller, and a B surface supporting back roller tangent to the peripheral surface of the A surface pressing roller is arranged on the side of the B surface pressing roller far away from the A surface lithium adhering roller.

Through adopting above-mentioned technical scheme, A face supports the backing roll and is tangent with A face squeeze roll outer peripheral face, and B face supports the backing roll and is tangent with B face squeeze roll outer peripheral face to make A face support the backing roll and B face support the backing roll and can improve the calendering rigidity that two-sided lithium pressed the mechanism, improve the quality stability of lithium membrane calendering process.

Optionally, a face lithium unwinding mechanism with be provided with lithium area fat liquoring mechanism between the two-sided lithium pressure covers the mechanism, lithium area fat liquoring mechanism includes:

the upper surface of the mounting base is provided with a bracket side plate;

the oiling assembly comprises an oil containing bin for containing the attached oil and an oiling roller for adhering the attached oil in the oil containing bin, the oil containing bin is arranged on the side wall of the support side plate, the oiling roller is rotatably arranged on the support side plate, and one end of the oiling roller is connected with an oiling driving piece for driving the oiling roller to rotate;

the oil scraping assembly comprises a scraper mounting seat matched with the support side plate in a sliding mode and an oil scraping roller used for scraping an oil film with uniform thickness on the surface of the oiling roller, and the oil scraping roller is detachably connected with the scraper mounting seat;

and the compression roller assembly is used for pressing the lithium belt on the peripheral surface of the oiling roller so as to adhere the attached oil uniformly scraped by the oil scraping roller.

Through adopting above-mentioned technical scheme, the fat liquoring driving piece drive fat liquoring roller rotates, and after the fat liquoring roller adhesion holds the adhesive oil in the oil storehouse, the scraper mount pad drives the oil scraping roller and goes out the even oil film of one deck thickness at the surface knife coating of fat liquoring roller, then compression roller assembly compresses tightly the lithium area in the outer peripheral face of oil liquoring roller with the even adhesive oil of adhesion through the oil scraping roller knife coating to guarantee that the adhesive oil on lithium area surface is even unanimous. Because the scraper mount pad can slide on the support curb plate, consequently need adjust the in-process that the thickness of oil film was gone up in the lithium area, can be through scraping the distance between oil roller and the oiling roller to make and scrape the oil roller and can scrape out the oil film of different thickness on the oiling roller, thereby improve the accuracy nature of oil film thickness in the fat liquoring process.

Optionally, two-sided lithium is pressed and is covered mechanism below and set up broad width adjustment mechanism, broad width adjustment mechanism include the broad width base, be used for A face glue lithium roller or B face glues the roller face scraper of the lithium membrane of lithium roller's outer peripheral face knife coating setting for the width and set up in the broad width driving piece of broad width base top, the control of broad width driving piece the roller face scraper in the length direction of broad width base slides.

By adopting the technical scheme, when the blade coating width on the surface of the A-surface lithium-bonded roller or the B-surface lithium-bonded roller is required to be adjusted according to an actual application scene, the wide driving piece controls the roller surface scraper to slide in the length direction of the wide base, so that the application flexibility of the wide adjusting mechanism is improved.

In a second aspect, the present application further provides a lithium supplementing method, which adopts the following technical scheme.

A lithium supplementing method is applied to the composite negative plate lithium supplementing device, and comprises the following steps:

outputting a smooth surface negative plate in a pole plate unwinding mechanism and reserving the smooth surface negative plate for use;

outputting the A-surface lithium belt, and outputting and reserving the A-surface lithium belt in the A-surface lithium unwinding mechanism;

outputting the B-surface lithium belt, and outputting and reserving the B-surface lithium belt in a B-surface lithium unwinding mechanism;

the double-sided lithium laminating mechanism simultaneously receives the A-side lithium belt in the A-side lithium unwinding mechanism, the smooth negative plate in the pole piece unwinding mechanism and the B-side lithium belt in the B-side lithium unwinding mechanism and rolls and laminates the A-side lithium belt, the smooth negative plate and the B-side lithium belt to form a double-sided lithium film negative plate;

and (4) winding a finished product, namely winding the double-sided lithium film negative plate in a pole plate winding mechanism.

Through adopting above-mentioned technical scheme, plain noodles negative pole piece, A face lithium area and B face lithium area get into two-sided lithium simultaneously and press to cover the mechanism and directly press and cover for two-sided lithium membrane negative pole piece, and rethread pole piece winding mechanism rolls up, has reduced the use of protection film for this compound negative pole piece mends lithium device's structure is compacter, thereby reduces the negative pole piece and mends the cost of lithium in-process.

Optionally, a step of outputting a first protection film and a step of outputting a second protection film are further provided before the double-sided pressing step, the first protection film is output and reserved in the first back film unwinding mechanism, and the second protection film is output and reserved in the second back film unwinding mechanism;

in the double-sided pressing step, the double-sided lithium pressing mechanism further receives a first protection film in the first back film unwinding mechanism and a second protection film in the second back film unwinding mechanism, the first protection film is located on the side face, away from the smooth negative plate, of the A-side lithium belt, the second protection film is located on the side face, away from the smooth negative plate, of the B-side lithium belt, the first protection film enters the double-sided lithium pressing mechanism along with the A-side lithium belt, and the second protection film enters the double-sided lithium pressing mechanism along with the B-side lithium belt;

and a first protective film rolling step and a second protective film rolling step are further arranged after the double-sided pressing step, the first protective film transmitted from the double-sided lithium pressing mechanism is received in the first back film rolling mechanism and rolled, and the second protective film transmitted from the double-sided lithium pressing mechanism is received in the second back film rolling mechanism and rolled.

Through adopting above-mentioned technical scheme, two-sided lithium is pressed and is covered the mechanism and when covering the two sides of closing the plain noodles negative pole piece with A face lithium area and B face lithium area calendering, first protection film can protect A face lithium area to keep away from the surface of plain noodles negative pole piece place side, and the second protection film can protect B face lithium area to keep away from the surface of plain noodles negative pole piece place side to improve the yields of two-sided lithium membrane negative pole piece in the production process.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the production cost is low. When pole piece unwinding mechanism transmitted out and sent into two-sided lithium and press and cover the mechanism, A face lithium area and B face lithium area were also transmitted out and get into two-sided lithium simultaneously and press and cover the mechanism by A face lithium unwinding mechanism and B face lithium unwinding mechanism to directly pressing and cover for two-sided lithium membrane negative pole piece, rethread pole piece winding mechanism carries out the rolling, the use of protection film has been reduced, make this compound negative pole piece mend the structure of lithium device compacter, thereby reduce the negative pole piece and mend the cost of lithium in-process.

2. The production yield is high. First protection film is located A face lithium area and keeps away from the side at plain noodles negative pole piece place and follow A face lithium area and get into two-sided lithium simultaneously and press and cover the mechanism, the second protection film is located B face lithium area and keeps away from the side at plain noodles negative pole piece place and follows B face lithium area and get into two-sided lithium simultaneously and press and cover the mechanism, so that two-sided lithium is pressed and is covered the mechanism and when covering A face lithium area and the two sides of closing the plain noodles negative pole piece with B face lithium area calendering, the surface that plain noodles negative pole piece place side is kept away from in A face lithium area can be protected to first protection film, the surface that plain noodles negative pole piece place side was kept away from in B face lithium area can be protected to the second protection film, thereby improve A face lithium area and B face lithium area by the problem of compression roller fish tail. The compression roller assembly compresses the lithium belt tightly on the peripheral surface of the oiling roller so as to adhere the oil which is uniformly coated by the oil scraping roller in a scraping way, so that the uniformity of the oil on the surface of the lithium belt is ensured. Because the scraper mount pad can slide on the support curb plate, consequently at the in-process that needs adjusted lithium area oiling film thickness, can be through scraping the distance between oiling roller and the oiling roller, so that scrape the oil roller and can scrape the blade coating of different thickness on the oiling roller, when needs are adjusted according to the blade coating width on practical application scene to A face glue lithium roller or B face glue lithium roller surface, the length direction slip of broad width driving piece control roll surface scraper in the broad width base, from the width and the thickness aspect of oil film, improve the uniformity and the yields of production.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a lithium supplementing device for a composite negative plate in the embodiment of the present application;

FIG. 2 is a schematic view showing the overall structure of a lithium ribbon oiling mechanism in the embodiment of the present application;

FIG. 3 is a cross-sectional view of an oiling assembly and an oil scraping assembly in an embodiment of the present application;

fig. 4 is a schematic view of the entire structure of the width adjustment mechanism in the embodiment of the present application.

Description of reference numerals:

11. installing a frame;

12. a pole piece unwinding mechanism; 121. a smooth negative reel; 122. a smooth negative plate; 123. a tape splicing platform; 124. a pole piece deviation rectifying assembly;

13. the surface A comprises a lithium unwinding mechanism; 131. a surface lithium reel; 132. a surface lithium belt; 133. a speed governing roller assembly;

14. a lithium belt oiling mechanism; 141. installing a base; 1411. a bracket side plate; 1412. a stirring driving seat; 1413. a stirring rod seat; 1413a, stirring blade; 142. an oiling component; 1421. an oil containing bin; 1421a, a material coating plate; 1421b, oiling baffle; 1421c, an accommodating cavity; 1422. an oiling roller; 1423. coating oil on a driving part; 143. a scraping component; 1431. a scraper mounting seat; 1432. an oil scraping roller; 1433. the oil scraping driving cylinder; 1434. a dial indicator mounting block; 1435. a scraping oil dial gauge; 144. a compression roller assembly; 1441. a roller seat; 1442. a pressure roller; 1443. a cylinder mounting plate; 1444. extruding a driving cylinder; 1445. extruding the dial indicator; 145. a side oil pick-up assembly; 1451. a side sliding seat; 1452. a side oil-sticking bracket; 1453. a side viscous oil box; 1454. side oil-sticking rollers; 1455. a side oil-sticking motor;

15. a first back film unwinding mechanism; 151. a first backing film roll; 152. a first protection film; 153. a back film oiling module;

16. a second back film unwinding mechanism; 161. a second backing film roll; 162. a second protective film;

17. a surface B lithium unwinding mechanism; 171. b surface lithium reel; 172. b surface lithium belt;

18. a double-sided lithium pressing mechanism; 181. a double-sided lithium film negative plate; 182. rolling the main body frame; 183. a surface extrusion roller; 184. a surface A is adhered with a lithium roller; 185. a B surface extrusion roller; 186. adhering a lithium roller on the surface B; 187. the A surface supports a back roll; 188. the B surface supports a back roller;

19. a width adjustment mechanism; 191. a wide base; 1911. an angle adjusting plate; 1912. an angle adjusting groove; 192. a wide drive member; 193. a dust collection assembly; 1931. a dust collection bracket; 1932. a dust suction chuck; 1933. a dust hood; 194. a roll surface scraper;

20. a first back film winding mechanism; 201. a first back film rolling roller;

21. a second back film winding mechanism; 211. a second back film winding roller;

22. a pole piece winding mechanism; 221. a pole piece winding roller; 222. a heat absorbing film roller.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a lithium supplementing device for a composite negative plate.

Referring to fig. 1, the composite negative plate lithium supplementing device is a production line installed on a vertically-arranged installation rack 11, and comprises a pole plate unwinding mechanism 12, an a-side lithium unwinding mechanism 13, a B-side lithium unwinding mechanism 17, a double-side lithium covering mechanism 18 and a pole plate winding mechanism 22 in sequence according to the sequence of the production flow. The working process of the composite negative plate lithium supplementing device is that when the smooth negative plate 122 in the smooth negative winding drum 121 is transported out by the pole piece unwinding mechanism 12 and sent into the double-faced lithium covering mechanism 18, the a-face lithium belt 132 and the B-face lithium belt 172 are also transported out from the a-face lithium winding drum 131 and the B-face lithium winding drum 171 by the a-face lithium unwinding mechanism 13 and the B-face lithium unwinding mechanism 17 and simultaneously enter the double-faced lithium covering mechanism 18, so that the double-faced lithium film negative plate 181 is directly covered by pressing, and then is wound by the pole piece winding mechanism 22.

Specifically, referring to fig. 1, the pole piece unwinding mechanism 12 includes a smooth negative winding drum 121 wound with a smooth negative pole piece 122, a tape splicing platform 123, a pole piece deviation rectifying assembly 124, and a plurality of transmission rollers for transmitting the smooth negative pole piece 122, and the smooth negative winding drum 121 wound with the smooth negative pole piece 122 is installed on a side wall of the installation frame 11. Plain noodles negative pole reel 121 is roughly cylindricly set up, gets into pole piece deviation correcting assembly 124 after the plain noodles negative pole piece 122 that is transported out from plain noodles negative pole reel 121 passes through the bearing of take-up platform 123 and rectifies a deviation to the advancing direction of plain noodles negative pole piece 122 to make the direction of motion perpendicular to installation frame 11's side surface of plain noodles negative pole piece 122, guarantee to press the smooth going on of in-process.

Referring to fig. 1, the a-side lithium unwinding mechanism 13 includes an a-side lithium winding drum 131 wound with an a-side lithium tape 132, a dancer roller assembly 133, and a plurality of transport rollers for transporting the a-side lithium tape 132, wherein the a-side lithium winding drum 131 wound with the a-side lithium tape 132 is mounted on a side wall of the mounting frame 11. The a-side lithium roll 131 is substantially cylindrical, and the a-side lithium tape 132 transported from the a-side lithium roll 131 is speed-regulated by the speed-regulating roller assembly 133, so that the speed of the a-side lithium tape 132 entering the double-side lithium coating mechanism 18 can be effectively controlled, and the thickness of the a-side lithium tape 132 can be controlled in terms of feeding speed. The B-side lithium unwinding mechanism 17 is substantially the same as the a-side lithium unwinding mechanism 13, and is not described in detail in this specification.

Referring to fig. 1, the double-sided lithium laminating mechanism 18 includes a rolling main body frame 182, and an a-side pressing roller 183, an a-side lithium-binding roller 184, a B-side pressing roller 185, and a B-side lithium-binding roller 186 rotatably disposed in the rolling main body frame 182, and the rolling main body frame 182 has a substantially hollow rectangular parallelepiped structure. The surface a lithium-binding roll 184 and the surface B lithium-binding roll 186 are both located between the surface a squeeze roll 183 and the surface B squeeze roll 185, wherein the surface a squeeze roll 183 and the surface a lithium-binding roll 184 form a set of calendering sets for calendering the surface a lithium ribbon 132, the surface B squeeze roll 185 and the surface B lithium-binding roll 186 form a set of calendering sets for calendering the surface B lithium ribbon 172, a first calendering space for calendering the surface a lithium ribbon 132 is provided between the surface a squeeze roll 183 and the surface a lithium-binding roll 184, and a second calendering space for calendering the surface B lithium ribbon 172 is provided between the surface B squeeze roll 185 and the surface B lithium-binding roll 186.

The surface A squeezing roller 183 and the surface A lithium-sticking roller 184 are driven by independent motors, wherein the surface A squeezing roller 183 and the surface A lithium-sticking roller 184 have a rotation speed difference of 250-. In this embodiment, the rotation speed ratio of the a-side squeeze roll 183 to the a-side lithium-binding roll 184 is 1/300, so that during rolling of the a-side lithium strip 132, the a-side squeeze roll 183 and the a-side lithium-binding roll 184 with a rotation speed difference generate different forces on the a-side lithium strip 132, and the a-side lithium-binding roll 184 with a higher rotation speed rapidly thins the a-side lithium strip 132 by rapidly rubbing the a-side lithium strip 132. The relationship between the a-side pressing roller 183 and the a-side lithium-binding roller 184 is the same as described above, and is not described in detail in this specification.

The a-side lithium-binding roller 184 and the B-side lithium-binding roller 186 form a set of coating groups for coating the smooth-side negative electrode sheet 122, the a-side lithium ribbon 132 and the B-side lithium ribbon 172, and a coating space for coating the rolled a-side lithium ribbon 132, the smooth-side negative electrode sheet 122 and the rolled B-side lithium ribbon 172 is formed between the a-side lithium-binding roller 184 and the B-side lithium-binding roller 186. In this embodiment, the rotation speeds of the a-side lithium-binding roller 184 and the B-side lithium-binding roller 186 are the same, so that the thicknesses of the lithium films laminated on both sides of the smooth negative plate 122 are the same.

Referring to fig. 1, in order to improve the rolling rigidity of the double-sided lithium laminating mechanism 18, an a-side support back roll 187 which is tangent to the outer peripheral surface of the a-side pressure roll 183 is provided on the side of the a-side pressure roll 183 away from the a-side lithium-sticking roll 184, and a B-side support back roll 188 which is tangent to the outer peripheral surface of the a-side pressure roll 183 is provided on the side of the B-side pressure roll 185 away from the a-side lithium-sticking roll 184. In the present embodiment, the a-side support back roller 187 and the B-side support back roller 188 are both solid alloy steel rollers, so that the a-side support back roller 187 and the B-side support back roller 188 have sufficient rigidity to have stable support for the a-side pressing roller 183 and the B-side pressing roller 185.

Referring to fig. 1, the pole piece winding mechanism 22 includes a pole piece winding roller 221 for winding the double-sided lithium film negative pole piece 181, a heat absorption film roller 222 accommodating a heat absorption film for attaching the double-sided lithium film negative pole piece 181 and cooling the double-sided lithium film negative pole piece 181, and a temperature measurement protection module. The double-sided lithium film negative electrode sheet 181 can be rapidly cooled after being rolled by attaching a layer of heat absorption film on the surface of the double-sided lithium film negative electrode sheet 181. Meanwhile, the temperature measurement protection module can monitor the temperature in the pole piece winding mechanism 22 and adopt over-temperature protection when the temperature is too high.

Referring to fig. 1, in order to protect the surface of the side where the a-surface lithium ribbon 132 is away from the smooth negative plate 122 when the a-surface lithium ribbon 132 is rolled and covered on one surface of the smooth negative plate 122, and in order to protect the surface of the side where the B-surface lithium ribbon 172 is away from the smooth negative plate 122 when the B-surface lithium ribbon 172 is rolled and covered on the other surface of the smooth negative plate 122, the composite negative plate lithium replenishing device further includes a first back film unwinding mechanism 15, a first back film winding mechanism 20, a second back film unwinding mechanism 16, and a second back film winding mechanism 21. A first back film winding drum 151 is arranged in the first back film unwinding mechanism 15, the first protection film 152 in the first back film winding drum 151 is conveyed through a conveying roller, and the first protection film 152 is located on the side where the smooth surface negative plate 122 is far away from the a surface lithium strip 132 and enters a first rolling space between the a surface squeezing roller 183 and the a surface lithium sticking roller 184 along with the a surface lithium strip 132. The first protective film 152 can protect the surface of the a-side lithium ribbon 132 away from the side of the smooth negative plate 122, and the problem that the a-side lithium ribbon 132 is scratched by the pressing roller is solved. A second back film reel 161 is arranged in the second back film unwinding mechanism 16, a second protection film 162 in the second back film reel 161 is transported by a transport roller, the second protection film 162 is located on the side where the B-side lithium strip 172 is far away from the smooth negative plate 122 and enters a second rolling space between the B-side squeezing roller 185 and the B-side lithium-sticking roller 186 along with the B-side lithium strip 172, the second protection film 162 can protect the surface where the B-side lithium strip 172 is far away from the smooth negative plate 122, and the problem that the B-side lithium strip 172 is scratched by a pressing roller is solved. The first back film winding mechanism 20 has a first back film winding roller 201, and the second back film winding mechanism 21 has a second back film winding roller 211. The first back film rolling roller 201 rolls the first protection film 152 transmitted out of the double-sided lithium pressing mechanism 18, and the second back film rolling roller 211 rolls the second protection film 162 transmitted out of the double-sided lithium pressing mechanism 18.

Referring to fig. 1, in order to ensure that the two sides of the a-side lithium ribbon 132 have different adhesion forces during the rolling process of the a-side lithium ribbon 132 so that the a-side lithium ribbon 132 can adhere to the a-side lithium adhering roller 184 after rolling, each of the first back film unwinding mechanism 15 and the first back film unwinding mechanism 15 includes a back film oiling module 153, and the back film oiling module 153 is configured to coat one side of the first protective film 152 and the second protective film 162 close to the smooth negative electrode sheet 122 with adhesion oil.

Referring to fig. 1 and 2, the lithium ribbon oiling mechanism 14 includes a mounting base 141, an oiling assembly 142, an oil scraping assembly 143, a pressure roller assembly 144, and a side oil sticking assembly 145. The mounting base 141 is in the shape of a rectangular parallelepiped plate. A bracket side plate 1411 is fixedly mounted on the upper surface of the mounting base 141, and a flat plate-shaped bracket side plate 1411 is vertically fixed on the upper surface of the mounting base 141. In this embodiment, the support side plates 1411 are provided in two, and an installation space for installing each roller is formed between the two support side plates 1411. The oil coating assembly 142, the oil scraping assembly 143, the press roller assembly 144 and the side oil sticking assembly 145 are mounted on the bracket side plate 1411 or the mounting base 141.

Referring to fig. 2 and 3, the oil coating assembly 142 is used to coat the adhesion oil on the lithium ribbon. Specifically, the oiling assembly 142 includes an oiling roller 1422 for adhering the adhering oil in the oil receiving bin 1421, an oil receiving bin 1421 for receiving the adhering oil, and an oiling driving member 1423 for driving the oiling roller 1422 to rotate, the oiling roller 1422 is in rotating fit with the bracket side plate 1411, and the oil receiving bin 1421 is fixedly mounted on the side wall of the bracket side plate 1411. In this embodiment, the oil accommodating bin 1421 is composed of an oil applying plate 1421a tangent to and attached to the outer peripheral surface of the oil applying roller 1422, and two oil applying baffles 1421b disposed on the oil applying plate 1421a, and the oil applying plate 1421a, the oil applying roller 1422, and the two oil applying baffles 1421b jointly enclose to form an accommodating cavity 1421c for accommodating the adhering oil. The oil applying plate 1421a is disposed to be inclined substantially in a plate shape, and the inclined direction of the oil applying plate 1421a is inclined downward in a direction close to the oil applying roller 1422. Because the peripheral surface of the oiling plate 1421a and the oiling roller 1422 is tangent, and the oiling baffle 1421b has a contact surface matching the outer peripheral surface of the oiling roller 1422, the oiling roller 1422 can carry out the adhesion of the oil in the oil storage 1421 during the rotation process. Simultaneously, in order to guarantee that the width of producing oil in oiling roller 1422 can adjust, fat liquoring baffle 1421b can be dismantled through the puller bolt with fat liquoring flitch 1421a and be connected and fat liquoring baffle 1421b and the cooperation of sliding of fat liquoring flitch 1421a to the convenient fat liquoring that carries out the adaptability width to the lithium area of various widths reduces the fat liquoring cost.

Referring to fig. 2 and 3, in order to improve the unevenness of the composition of the adhered oil in the oil storage 1421 due to the deposition for a long time, an agitation driving seat 1412 is provided on the top end surface of the holder side plate 1411. In this embodiment, the stirring driving base 1412 is a linear motor. A stirring rod seat 1413 is slidably arranged on the stirring driving seat 1412, and the stirring rod seat 1413 is mounted on a sliding block of the linear motor, so that the stirring rod seat 1413 can slide on the stirring driving seat 1412 in a reciprocating manner. The stirring rod seat 1413 is fixedly provided with a stirring scraper 1413a, and the stirring scraper 1413a extends into the oil accommodating bin 1421 and stirs the adhesive in the oil accommodating bin 1421, so that the condition that the adhesive oil in the oil accommodating bin 1421 is uneven in distribution is improved. Meanwhile, when new attached oil is added into the oil accommodating bin 1421, the attached oil has viscosity, so that the stirring scraper 1413a can quickly and uniformly scrape the attached oil added into the oil accommodating bin 1421 and the oil accommodating bin 1421, and the problem of attached oil overflow in the process of adding the new attached oil into the oil accommodating bin 1421 is solved.

Referring to fig. 2 and 3, the oil scraping assembly 143 is used to scrape an oil film having a uniform thickness on the oiling roller 1422. The oil wiping assembly 143 includes a blade mount 1431 and an oil wiping roller 1432. Scraper mount 1431 slides the cooperation through linear guide with support curb plate 1411, and oil scraping roller 1432 sets up in oiling roller 1422's below, and oil scraping roller 1432 is used for scraping out the even oil film of thickness on oiling roller 1422 surface, and oil scraping roller 1432 can dismantle with scraper mount 1431 and be connected to be convenient for oil scraping roller 1432's change. In this embodiment, the oil scraping roller 1432 is a comma roller, and the oil scraping roller 1432 functions as a scraper, and the oil scraping roller 1432 and the scraper mounting seat 1431 do not rotate with each other, so as to ensure that the oil scraping roller 1432 is stable in position during the oil scraping process.

Referring to fig. 2 and 3, the bracket side plate 1411 is provided with a scraper driving cylinder 1433, and a moving shaft of the scraper driving cylinder 1433 is fixedly connected with the scraper mount 1431 for driving the scraper mount 1431 to move vertically upward so that the scraper roller 1432 can have an initial pressing force against the oiling roller 1422. An L-shaped dial indicator mounting block 1434 is fixedly arranged on the side face of the bracket side plate 1411, an oil scraping dial indicator 1435 is mounted on the dial indicator mounting block 1434, and a supporting column of the oil scraping dial indicator 1435 is used for supporting the scraper mounting seat 1431 so as to overcome the pressing force of the oil scraping roller 1432 on the oiling roller 1422, and therefore the pressing force of the oil scraping roller 1432 on the oiling roller 1422 is adjusted by adjusting the oil scraping dial indicator 1435. The oil scraping dial indicator 1435 can have clear adjustment data in the process of adjusting the position of the oil scraping roller 1432, can calculate and store the setting distance of the oil scraping roller 1432 in the form of recording parameters, and is convenient to quickly adjust in the subsequent maintenance process.

Referring to fig. 2 and 3, the pressing roller assembly 144 serves to press the lithium ribbon against the outer circumferential surface of the oiling roller 1422 to adhere the adhering oil scraped uniformly by the oil scraping roller 1432. The pressing roller assembly 144 includes a pressing roller housing 1441 and a pressing roller 1442 rotatably disposed on the pressing roller housing 1441. The pressing roller seat 1441 slides on the mounting base 141 through a linear slide rail, and the central axis of the pressing roller 1442 is parallel to the central axis of the oiling roller 1422. In this embodiment, the pressure roller 1442 is a driven roller and has no active rotation capability. The side of the mounting base 141 is provided with a cylinder mounting plate 1443, the cylinder mounting plate 1443 is fixedly provided with a pressing driving cylinder 1444, and the pressing driving cylinder 1444 is used for pushing the pressing roller seat 1441 towards the bracket side plate 1411, so that the pressing roller 1442 can have an initial pressing force on the oiling roller 1422. An extrusion dial indicator 1445 is arranged on the pressing roller seat 1441, and a supporting column of the extrusion dial indicator 1445 is used for supporting the support side plate 1411 so as to overcome the pressing force of the pressing roller 1442 on the oiling roller 1422, so that the pressing force of the pressing roller 1442 can be adjusted, and therefore it is guaranteed that oil attached to the surface of the lithium belt is uniform and consistent. The extrusion dial indicator 1445 can have clear and definite adjusting data in the process of adjusting the position of the compression roller 1442, the setting distance of the compression roller 1442 can be calculated and stored in a parameter recording mode, and quick adjustment can be conducted in the follow-up maintenance process conveniently.

Referring to fig. 2, since the thickness of the lithium ribbon needs to be reduced before the lithium ribbon is laminated with the smooth negative plate 122, in the process of reducing the thickness of the lithium ribbon, in order to ensure that the thickness of the oil film on the surface of the lithium ribbon is uniform, a side oil-sticking assembly 145 is arranged on the mounting base 141. Side oil-viscous assembly 145 is used for lubricating the side edge of the lithium strip, and side oil-viscous assembly 145 comprises a side sliding seat 1451, a side oil-viscous bracket 1452, a side oil-viscous box 1453, a side oil-viscous roller 1454 and a side oil-viscous motor 1455. In this embodiment, the side sliding seat 1451 is a linear motor. Side oil stick bracket 1452 is fixedly mounted to a slider of the linear motor so that side oil stick bracket 1452 can slide on side sliding base 1451 in a reciprocating manner. The side stick oil case 1453 is substantially provided in a hollow rectangular parallelepiped shape having an upper opening, and the side stick oil case 1453 is configured to contain adhesion oil. Side stick oil motor 1455 is mounted on a side of side stick oil bracket 1452 remote from side stick oil box 1453, side stick oil roller 1454 is for adhering the stick oil in side stick oil box 1453 and is driven by side stick oil motor 1455, and side stick oil roller 1454 is located above side stick oil box 1453. In order to ensure that the side edge of the lithium belt is oiled more sufficiently, the outer peripheral surface of the side oil-sticking roller 1454 is provided with a side oil-sticking groove, the side oil-sticking groove can contain attached oil on one hand, and the lithium belt can be embedded into the side oil-sticking groove on the other hand. Therefore, the side oil-sticking roller 1454 and the lithium belt have larger staggered area, and the uniformity of side oil-coating of the lithium belt is improved.

Referring to fig. 1 and 4, the width adjustment mechanism 19 includes a width base 191, two sets of width drivers 192, and two sets of roll surface scrapers 194, and the width drivers 192 correspond to the roll surface scrapers 194 one by one. The wide base 191 is generally in a flat plate shape, the wide driving part 192 is a linear driving platform composed of a ball screw and a linear slide rail, each set of the wide driving part 192 drives a corresponding set of the roller surface scrapers 194 to slide in the length direction of the wide base 191, so that the distance between the two sets of the roller surface scrapers 194 can be adjusted, the width of the rolled lithium film on the A-surface lithium-bonded roller 184 is adjusted, and the consistency of the rolling width of the lithium belt is ensured.

Referring to fig. 4, in order to improve the flexibility of mounting the width adjustment mechanism 19 when the width adjustment mechanism 19 is mounted on a specific frame, angle adjustment plates 1911 are provided on both end surfaces of the width base 191 in the longitudinal direction, and arc-shaped angle adjustment grooves 1912 are formed in the angle adjustment plates 1911. In this embodiment, two angle adjustment grooves 1912 are provided in each angle adjustment plate 1911, and the two angle adjustment grooves 1912 are both arc-shaped and concentrically provided. The angle adjusting plate 1911 can be rotated according to the installation direction of different angles, and the angle adjusting plate 1911 is fixed to the frame by using a fixing bolt in the angle adjusting groove 1912, thereby improving the installation flexibility of the width adjusting mechanism 19.

The roll surface scraper 194 generates fine dust in scraping off the outer circumferential surface of the roll, and a dust suction unit 193 is further provided to a side of the wide base 191 to remove the fine dust. Referring to fig. 4, dust collection assembly 193 includes dust absorption support 1931, dust absorption chuck 1932 and suction hood 1933, and dust absorption support 1931 installs and is used for fixing dust absorption chuck 1932 and suction hood 1933 in the frame of equipment, and suction hood 1933 installs on dust absorption chuck 1932, and suction hood 1933 and negative pressure piece intercommunication, suction hood 1933's dust absorption mouth are rectangular shape setting and are located the one side at roll face scraper 194 place.

The embodiment of the application also discloses a lithium supplementing method.

A lithium supplementing method comprises the following steps:

s1, outputting a smooth surface negative plate 122, and outputting the smooth surface negative plate 122 in a pole plate unwinding mechanism 12 for use;

s2, outputting the A-surface lithium belt 132, and outputting and reserving the A-surface lithium belt 132 in the A-surface lithium unwinding mechanism 13;

s3, outputting the B-surface lithium belt 172, and outputting the B-surface lithium belt 172 in the B-surface lithium unwinding mechanism 17 for later use;

s4, outputting the first protection film 152, namely outputting the first protection film 152 in the first back film unreeling mechanism 15 for use;

s5, outputting a second protective film 162, namely outputting the second protective film 162 in the second back film unwinding mechanism 16 for later use;

s6, double-sided pressing, namely simultaneously receiving the A-side lithium tape 132 in the A-side lithium unwinding mechanism 13, the smooth negative plate 122 in the pole piece unwinding mechanism 12 and the B-side lithium tape 172 in the B-side lithium unwinding mechanism 17 by the double-sided lithium pressing mechanism 18, and rolling and covering the three to form a double-sided lithium film negative plate 181; the double-sided lithium pressing mechanism 18 further receives a first protection film 152 in the first back film unwinding mechanism 15 and a second protection film 162 in the second back film unwinding mechanism 16, the first protection film 152 is located on the side where the a-sided lithium tape 132 is far away from the smooth negative plate 122, the second protection film 162 is located on the side where the B-sided lithium tape 172 is far away from the smooth negative plate 122, the first protection film 152 enters the double-sided lithium pressing mechanism 18 along with the a-sided lithium tape 132, and the second protection film 162 enters the double-sided lithium pressing mechanism 18 along with the B-sided lithium tape 172;

s7, a first protection film 152 rolling step, namely receiving and rolling the first protection film 152 transmitted from the double-sided lithium press coating mechanism 18 in the first back film rolling mechanism 20;

s8, a second protective film 162 rolling step, namely receiving and rolling the second protective film 162 transmitted from the double-sided lithium laminating mechanism 18 in a second back film rolling mechanism 21;

and S9, winding a finished product, namely winding the double-sided lithium film negative plate 181 in the pole piece winding mechanism 22.

The above are preferred embodiments of the present application, and the scope of the present application is not limited thereto. Wherein like parts are designated by like reference numerals. It should be noted that as used in the foregoing description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component. Therefore, the method comprises the following steps: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a lithium device is mended to compound negative pole piece which characterized in that includes:

a mounting frame (11);

the pole piece unreeling mechanism (12) is used for accommodating the smooth negative pole winding drum (121) and transmitting the smooth negative pole piece (122) through a transmission roller, and the pole piece unreeling mechanism (12) is arranged on the installation rack (11);

the A-surface lithium unwinding mechanism (13) is used for accommodating the A-surface lithium winding drum (131) and transmitting an A-surface lithium belt (132) in the A-surface lithium winding drum (131) through a transmission roller, and the A-surface lithium unwinding mechanism (13) is arranged on the mounting rack (11);

the B-surface lithium unwinding mechanism (17) is used for accommodating a B-surface lithium winding drum (171) and transmitting a B-surface lithium belt (172) in the B-surface lithium winding drum (171) through a transmission roller, and the B-surface lithium unwinding mechanism (17) is arranged on the mounting rack (11);

the double-sided lithium covering mechanism (18) is used for receiving the smooth negative plate (122) in the pole piece unwinding mechanism (12), the A-side lithium belt (132) in the A-side lithium unwinding mechanism (13) and the B-side lithium belt (172) in the B-side lithium unwinding mechanism (17) and rolling and covering the smooth negative plate, the A-side lithium belt and the B-side lithium belt to form a double-sided lithium film negative plate (181), and the double-sided lithium covering mechanism (18) is arranged on the mounting rack (11);

and the pole piece winding mechanism (22) is used for winding the double-sided lithium film negative pole piece (181), and the pole piece winding mechanism (22) is arranged on the installation rack (11).

2. The composite negative plate lithium supplementing device according to claim 1, further comprising:

the first back film unwinding mechanism (15) is used for accommodating a first back film winding drum (151) and transmitting a first protection film (152) in the first back film winding drum (151) through a transmission roller, the first back film unwinding mechanism (15) is arranged on the installation rack (11), the first protection film (152) is positioned on the side face, away from the smooth negative plate (122), of the A-face lithium belt (132) and enters the double-face lithium pressing mechanism (18) along with the A-face lithium belt (132);

the first back film winding mechanism (20) is used for receiving and winding the first protection film (152) transmitted out of the double-sided lithium press mechanism (18);

the second back film unwinding mechanism (16) is used for accommodating a second back film winding drum (161) and transmitting a second protection film (162) in the second back film winding drum (161) through a transmission roller, the second back film unwinding mechanism (16) is arranged on the installation rack (11), and the second protection film (162) is positioned on the side face, away from the smooth negative plate (122), of the B-face lithium belt (172) and enters the double-face lithium press-coating mechanism (18) along with the B-face lithium belt (172);

and the second back film winding mechanism (21) is used for receiving and winding the second protection film (162) transmitted from the double-sided lithium press-coating mechanism (18).

3. The composite negative plate lithium supplementing device according to claim 2, wherein the double-sided lithium pressing mechanism (18) comprises a rolling main body frame (182), an A-sided squeezing roller (183), an A-sided lithium sticking roller (184), a B-sided squeezing roller (185) and a B-sided lithium sticking roller (186) are rotatably arranged in the rolling main body frame (182), and the A-sided lithium sticking roller (184) and the B-sided lithium sticking roller (186) are both positioned between the A-sided squeezing roller (183) and the B-sided squeezing roller (185); a first rolling space for rolling the A-surface lithium strip (132) is arranged between the A-surface squeezing roll (183) and the A-surface lithium-binding roll (184), and a second rolling space for rolling the B-surface lithium strip (172) is arranged between the B-surface squeezing roll (185) and the B-surface lithium-binding roll (186); and a covering space for covering the pressed A-side lithium belt (132), the polished negative plate (122) and the pressed B-side lithium belt (172) is arranged between the A-side lithium-sticking roller (184) and the B-side lithium-sticking roller (186).

4. The composite negative pole piece lithium supplementing device according to claim 3, wherein an A surface supporting back roller (187) tangent to the outer peripheral surface of the A surface pressing roller (183) is arranged on the side of the A surface pressing roller (183) far away from the A surface lithium adhering roller (184), and a B surface supporting back roller (188) tangent to the outer peripheral surface of the A surface pressing roller (183) is arranged on the side of the B surface pressing roller (185) far away from the A surface lithium adhering roller (184).

5. The lithium supplementing device for the composite negative plate according to claim 3, wherein a lithium belt oiling mechanism (14) is arranged between the A-side lithium unreeling mechanism (13) and the double-side lithium covering mechanism (18), and the lithium belt oiling mechanism (14) comprises:

the mounting device comprises a mounting base (141), wherein a bracket side plate (1411) is arranged on the upper surface of the mounting base (141);

the oiling assembly (142) comprises an oil containing bin (1421) for containing attached oil and an oiling roller (1422) for adhering the attached oil in the oil containing bin (1421), the oil containing bin (1421) is arranged on the side wall of the support side plate (1411), the oiling roller (1422) is rotatably mounted on the support side plate (1411), and one end of the oiling roller (1422) is connected with an oiling driving piece (1423) for driving the oiling roller (1422) to rotate;

the oil scraping assembly (143) comprises a scraper mounting seat (1431) matched with the bracket side plate (1411) in a sliding mode and an oil scraping roller (1432) used for scraping an oil film with uniform thickness on the surface of the oiling roller (1422), and the oil scraping roller (1432) is detachably connected with the scraper mounting seat (1431);

and the compression roller assembly (144) is used for pressing the lithium belt on the peripheral surface of the oiling roller (1422) so as to adhere the adhering oil uniformly scraped by the oil scraping roller (1432).

6. The lithium supplementing device of the composite negative pole piece according to claim 5, wherein a width adjusting mechanism (19) is arranged below the double-sided lithium pressing mechanism (18), the width adjusting mechanism (19) comprises a width base (191), a roll surface scraper (194) for scraping a lithium film with a set width on the outer circumferential surface of the A-side lithium adhering roller (184) or the B-side lithium adhering roller (186), and a width driving member (192) arranged above the width base (191), and the width driving member (192) controls the roll surface scraper (194) to slide in the length direction of the width base (191).

7. A lithium supplementing method is applied to the composite negative plate lithium supplementing device of any one of claims 1 to 6, and comprises the following steps:

outputting a smooth surface negative plate (122), and outputting the smooth surface negative plate (122) in a pole piece unreeling mechanism (12) for use;

outputting an A-surface lithium belt (132), and outputting the A-surface lithium belt (132) for use in an A-surface lithium unreeling mechanism (13);

outputting a B-surface lithium belt (172), and outputting the B-surface lithium belt (172) in a B-surface lithium unreeling mechanism (17) for use;

the double-sided lithium laminating mechanism (18) simultaneously receives the A-side lithium strip (132) in the A-side lithium unwinding mechanism (13), the smooth negative plate (122) in the pole piece unwinding mechanism (12) and the B-side lithium strip (172) in the B-side lithium unwinding mechanism (17) and rolls and laminates the A-side lithium strip, the smooth negative plate and the B-side lithium strip to form a double-sided lithium film negative plate (181);

and (4) winding a finished product, namely winding the double-sided lithium film negative plate (181) in a pole piece winding mechanism (22).

8. The lithium supplementing method according to claim 7, wherein the double-sided laminating step is preceded by a step of outputting a first protective film (152) and a step of outputting a second protective film (162), wherein the first protective film (152) is output and reserved in the first back film unwinding mechanism (15), and the second protective film (162) is output and reserved in the second back film unwinding mechanism (16);

in the double-sided pressing step, the double-sided lithium pressing mechanism (18) further receives a first protective film (152) in the first back film unreeling mechanism (15) and a second protective film (162) in the second back film unreeling mechanism (16), the first protective film (152) is located on the side face, away from the smooth negative plate (122), of the A-face lithium strip (132), the second protective film (162) is located on the side face, away from the smooth negative plate (122), of the B-face lithium strip (172), the first protective film (152) enters the double-sided lithium pressing mechanism (18) along with the A-face lithium strip (132), and the second protective film (162) enters the double-sided lithium pressing mechanism (18) along with the B-face lithium strip (172);

and a first protective film (152) rolling step and a second protective film (162) rolling step are further arranged after the double-sided pressing step, the first protective film (152) transmitted from the double-sided lithium pressing mechanism (18) is received in the first back film rolling mechanism (20) and rolled, and the second protective film (162) transmitted from the double-sided lithium pressing mechanism (18) is received in the second back film rolling mechanism (21) and rolled.

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