CN210040394U - Mechanism for forming lithium film and device for supplementing lithium to pole piece - Google Patents
Mechanism for forming lithium film and device for supplementing lithium to pole piece Download PDFInfo
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- CN210040394U CN210040394U CN201921050358.XU CN201921050358U CN210040394U CN 210040394 U CN210040394 U CN 210040394U CN 201921050358 U CN201921050358 U CN 201921050358U CN 210040394 U CN210040394 U CN 210040394U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a device that is used for the mechanism that the lithium membrane takes shape and is used for the lithium to mend by the pole piece. The mechanism for forming the lithium film comprises an auxiliary film providing mechanism, a transfer film providing mechanism, a surface treatment mechanism, a lithium strip providing mechanism and two rollers, wherein the auxiliary film is used for providing the auxiliary film comprising a first isolating film and a first release agent layer, the transfer film is used for providing the transfer film comprising a second isolating film and a second release agent layer, the lithium strip providing mechanism is used for providing the lithium strip, the surface treatment mechanism is used for removing the first release agent layer or the second release agent layer to increase the surface roughness of the corresponding part, and the two rollers are used for rolling the auxiliary film and the transfer film together with the lithium strip to roll the lithium strip into a lithium foil and enable the lithium foil to be adhered to the transfer film to form the lithium film. The device for pole piece lithium supplement comprises the mechanism for lithium film forming. Therefore, the two rollers work under the condition of low rolling force, and the lithium foil with good thickness consistency is uniformly adhered to the transfer film.
Description
Technical Field
The utility model relates to an electrochemistry field, more specifically relate to a device that is used for the mechanism that the lithium membrane takes shape and is used for lithium to mend to the pole piece.
Background
With the popularization of new energy automobiles, the requirements on power batteries of the new energy automobiles are more and more strict; for example, batteries are required to have both high energy density, long cycling and stable performance, as well as the ability to charge quickly.
At present, the cycle performance and the energy density can be improved by lithium supplement through the pole piece. Generally, in the pole piece lithium supplement technology, a first separation film and a second separation film clamp a lithium strip and enter two rollers for rolling to roll the lithium strip into a lithium foil and make the lithium foil adhere to the second separation film, and then the second separation film carrying the lithium foil is rolled with a pole piece to make the lithium foil separate from the second separation film and adhere to the pole piece, so that a lithium supplement pole piece is formed, thereby improving the cycle performance and energy density of a battery using the lithium supplement pole piece.
However, in the pole piece lithium supplementing technology, the lithium foil can be uniformly adhered to the second isolation film under a large rolling force to form a lithium film, and the roller is easy to deform under the condition of a large rolling force, so that the consistency of the thickness of the rolled lithium foil is influenced.
SUMMERY OF THE UTILITY MODEL
In view of the problems existing in the prior art, the utility model aims to provide a mechanism for lithium membrane takes shape and a device that is used for the lithium is mended to the pole piece, and it enables two rolls and works under less rolling force condition, can realize the lithium paper tinsel that the even adhesion thickness uniformity is good on the transfer film.
In order to achieve the above object, in a first aspect, the present invention provides a mechanism for lithium film formation, the mechanism for lithium film formation includes an auxiliary film providing mechanism, a transfer film providing mechanism, a surface treatment mechanism, a lithium ribbon providing mechanism and two rollers, the auxiliary film providing mechanism is located at the upstream of the two rollers, the auxiliary film providing mechanism is used for providing an auxiliary film between the two rollers, the auxiliary film includes a first isolation film and a first release agent layer disposed on the first isolation film; the transfer film providing mechanism is located at the upstream of the two rollers and used for providing the transfer film between the two rollers, the transfer film comprises a second isolating film and a second film remover layer arranged on the second isolating film, the lithium strip providing mechanism is located at the upstream of the two rollers and used for providing a lithium strip between the two rollers, the surface treatment mechanism is located at the upstream of the two rollers and used for removing the first film remover layer of the auxiliary film or the second film remover layer of the transfer film before entering the two rollers so as to increase the surface roughness of the corresponding part in the first isolating film or the second isolating film, and the two rollers are used for rolling the auxiliary film treated by the surface treatment mechanism together with the transfer film and the lithium strip so as to roll the lithium strip into a lithium foil and enable the lithium foil to be adhered on the transfer film to form the lithium film.
In one embodiment, the surface treatment mechanism is used to remove the first release agent layer or the second release agent layer using a laser.
In one embodiment, the surface treatment mechanism includes a computer, a laser, a collimating mirror, a holophote, a mirror, a focusing lens, and a CCD. The laser is in communication connection with the computer, the laser is used for emitting laser beams, the emitted laser beams can reach the focusing lens through the collimating mirror, the total reflection mirror and the reflecting mirror, the CCD is in communication connection with the computer, and the CCD is used for positioning the removing position of the first release agent layer or the second release agent layer; the computer is in communication connection with the laser and the CCD and is used for adjusting the intensity of the laser beam.
In one embodiment, the surface treatment mechanism is used to remove the first release agent layer or the second release agent layer with sandpaper.
In one embodiment, the surface treatment mechanism includes a computer, a CCD, a robotic arm, and sandpaper. The mechanical arm is in communication connection with the computer and is used for pressing the abrasive paper onto the first release agent layer or the second release agent layer, so that the first release agent layer or the second release agent layer can be removed; the computer is in communication connection with the mechanical arm and is used for controlling the processing time and the processing range of the abrasive paper; the CCD is in communication connection with a computer, and the CCD is used for positioning the removal position of the first release agent layer or the second release agent layer.
In one embodiment, the mechanism for lithium film formation further comprises an auxiliary film take-up mechanism located downstream of the two rolls. The auxiliary film take-up mechanism is used for taking up the auxiliary film passing between the two rollers.
In order to achieve the above object, in a second aspect, the present invention provides a device for lithium supplement of a pole piece, wherein the pole piece comprises a current collector and an active material layer arranged on the surface of the current collector, and the device for lithium supplement of the pole piece comprises a rolling mechanism and a pole piece providing mechanism; the rolling mechanism comprises two pressing rollers; the pole piece providing mechanism is positioned at the upstream of the two compression rollers, the pole piece providing mechanism is used for providing a pole piece between the two compression rollers, the device for supplementing lithium to the pole piece further comprises a mechanism for forming the lithium film according to the first aspect of the utility model, the mechanism for forming the lithium film is positioned at the upstream of the two compression rollers, and the distribution of the lithium foil on the transfer film corresponds to the distribution of the active substance layer on the current collector; two compression rollers are used for calendering the lithium film and the pole piece so as to enable the lithium foil in the lithium film to be adhered to the active material layer.
In one embodiment, the device for pole piece lithium supplement further comprises a transfer film collecting mechanism, the transfer film collecting mechanism is located at the downstream of the two compression rollers, and the transfer film collecting mechanism is used for enabling the lithium film to pass between the two compression rollers and collecting the transfer film in the lithium film passing between the two compression rollers.
In one embodiment, the device for pole piece lithium supplement further comprises a lithium supplement pole piece collecting mechanism, the lithium supplement pole piece collecting mechanism is located at the downstream of the two compression rollers, and the lithium supplement pole piece collecting mechanism is used for collecting the pole pieces adhered with the lithium foil.
In one embodiment, the mechanisms for lithium film formation are two sets to provide lithium foil to both surfaces of the pole piece.
The utility model has the advantages as follows: because the surface treatment mechanism is used for getting rid of so that the surface roughness increase of the corresponding part in first barrier film or the second barrier film to the first release agent layer of auxiliary film or the second release agent layer of transfer film, so two rolls can work under less rolling force condition, and then two rolls are non-deformable under less rolling force condition to realize the lithium foil that the even adhesion thickness uniformity is good on the transfer film.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of an apparatus for pole piece lithium supplement according to the present invention.
Fig. 2 is a schematic diagram of a second embodiment of the device for pole piece lithium supplement according to the present invention.
Fig. 3 is a schematic diagram of a third embodiment of the device for pole piece lithium supplement according to the present invention.
Fig. 4 is a schematic view of a first embodiment of a surface treatment mechanism of a device for pole piece lithium supplement according to the present invention.
Fig. 5 is a schematic view of a second embodiment of a surface treatment mechanism of the device for pole piece lithium supplement according to the present invention.
Wherein the reference numerals are as follows:
1 rolling mechanism 33 surface treatment mechanism
11 pressure roller 330 backing roller
2 pole piece supply mechanism 331 computer
P0 pole piece 332 laser
P01 current collector 333 collimating mirror
R blank current collector region 334 full-reflecting mirror
P02 active material layer 335 mirror
3 mechanism for lithium film formation 336 focusing lens
31 auxiliary film supply mechanism 337CCD
A auxiliary membrane 338 mechanical arm
S1 first isolating film 339 sandpaper
G1 first Release agent layer 34 lithium tape supply mechanism
E1 first stripper layer removing segment L0 lithium tape
M1 first mold release agent retention section 35 two rolls
32 transfer film supply mechanism L1 lithium foil
T transfer membrane C lithium membrane
S2 auxiliary film collecting mechanism of second isolation film 36
G2 second release agent layer 4 transfer film collecting mechanism
E2 second parting agent layer removing section 5 lithium supplement electrode piece collecting mechanism
M2 second release agent layer reserving section P1 lithium supplement pole piece
Detailed Description
The accompanying drawings illustrate embodiments of the present invention and it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention.
Further, expressions of directions indicated for explaining operations and configurations of respective members in the embodiment, such as upper, lower, left, right, front, and rear, are not absolute but relative, and although these indications are appropriate when the respective members are in the positions shown in the drawings, when the positions are changed, the directions should be interpreted differently to correspond to the changes.
Fig. 1 is a schematic diagram of a first embodiment of an apparatus for pole piece lithium supplement according to the present invention. Fig. 2 is a schematic diagram of a second embodiment of the device for pole piece lithium supplement according to the present invention. Fig. 3 is a schematic diagram of a third embodiment of the device for pole piece lithium supplement according to the present invention. Fig. 4 is a schematic view of a first embodiment of the surface treatment mechanism 33 of the mechanism 3 for lithium film formation of the device for lithium pole piece replenishment according to the present invention. Fig. 5 is a schematic view of a second embodiment of the surface treatment mechanism 33 of the mechanism 3 for lithium film formation of the device for lithium pole piece replenishment according to the present invention.
As shown in fig. 1 to 3, the device for pole piece lithium supplement comprises a rolling mechanism 1, a pole piece providing mechanism 2 and a mechanism 3 for lithium film forming. According to the actual situation, the device for supplementing lithium to the pole piece can also comprise a transfer film collecting mechanism 4. According to the actual situation, the device for pole piece lithium supplement can also comprise a lithium supplement pole piece collecting mechanism 5. The pole piece P0 includes a current collector P01 and an active material layer P02 disposed on the surface of the current collector P01. In fig. 1, an active material layer P02 is continuously provided on the surface of a current collector P01. In fig. 2 and 3, specifically, the active material layers P02 are intermittently provided on the surface of the current collector P01, and the intermittent active material layers P02 are flanked by blank current collector regions R, that is, the portions of the surface of the current collector P01 where the active material layers P02 are not provided are blank current collector regions R. In fig. 2 and 3, the active material layer P02 and the blank current collector region R are alternately arranged, but of course, the active material layer P02 and the blank current collector region R may each be only one. In fig. 2 and 3, active material layers P02 on both sides of the current collector P01 are symmetrically distributed with respect to the current collector P01, but of course, active material layers P02 on both surfaces of the current collector P01 may be asymmetrically distributed with respect to the current collector P01. The active material layer P02 may be provided on only one surface of the current collector P01, or as shown in fig. 1 to 3. The active material layer P02 is provided on both surfaces of the current collector P01. As shown in fig. 1 and 2, the pole piece supply mechanism 2 may be a roller, so that the pole piece supply mechanism 2 unreels the pole piece P0 in the form of a roll.
The roll pressing mechanism 1 includes two press rolls 11.
The pole piece supply means 2 are located upstream of the two pressure rollers 11. The pole piece supply mechanism 2 is used to supply a pole piece P0 between two pressure rollers 11.
The mechanism 3 for lithium film formation is located upstream of the two press rolls 11. The mechanism 3 for lithium film formation causes the lithium foil L1 to adhere to the transfer film T to form a lithium film C.
The mechanism 3 for lithium film formation includes an auxiliary film supply mechanism 31, a transfer film supply mechanism 32, a surface treatment mechanism 33, a lithium ribbon supply mechanism 34, and two nip rollers 35. Depending on the actual situation, the mechanism 3 for lithium film formation may further include an auxiliary film take-up mechanism 36,
the auxiliary film supply mechanism 31 is located upstream of the two nip rollers 35. The auxiliary film supply mechanism 31 is for supplying the auxiliary film a between the two nip rollers 35. The auxiliary film a includes a first release film S1 and a first release agent layer G1 disposed on the first release film S1. As shown in fig. 1 to 3, in the auxiliary film a provided by the auxiliary film providing mechanism 31, the first release agent layer G1 is continuously provided on the first separator S1. As shown in fig. 1 to 3, the auxiliary film supply mechanism 31 is a roller, so that the auxiliary film supply mechanism 34 is used to unwind the auxiliary film a in the form of a roll.
The transfer film supply mechanism 32 is located upstream of the two nip rollers 35. The transfer film supply mechanism 32 is configured to supply the transfer film T between the two rollers 35, and the transfer film T includes a second separator S2 and a second release agent layer G2 provided on the second separator S2. As shown in fig. 1 to 3, in the transfer film T supplied from the transfer film supply mechanism 32, the second release agent layer G2 is continuously provided on the second separator S2. As shown in fig. 1 to 3, the transfer film supply mechanism 32 is a roller, so that the transfer film supply mechanism 32 is used to unwind the transfer film T in the form of a roll.
The surface treatment means 33 is located upstream of the two rolls 35. The surface treatment mechanism 33 is used to remove the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T before entering the two rolls 35, so as to increase the surface roughness of the corresponding portion of the first release film S1 or the second release film S2.
In the first embodiment shown in fig. 1, the surface treatment mechanism 33 is used to continuously remove the second release agent layer G2, and after the auxiliary film a, the lithium tape L0 and the transfer film T are rolled into the two rollers 35, the lithium foil L1 is continuously adhered to the second separator S2 of the transfer film T to form the lithium film C. Note that the first release agent layer G1 of the auxiliary film a was not subjected to the removal treatment. Due to the processing by the surface processing mechanism 33, the surface roughness of the portion of the second release film S2 from which the second release agent layer G2 is removed is increased. The surface roughness of the second release film S2 at the second release agent layer removing stage E2 is greater than that of the first release agent layer G1.
In the second and third embodiments shown in fig. 2 and 3, the surface treatment mechanism 33 is used to intermittently remove the less rough one of the first release agent layer G1 and the second release agent layer G1. Specifically, in the second embodiment shown in fig. 2, the surface roughness of the second release agent layer G2 is smaller than that of the first release agent layer G1, and after the auxiliary film a, the lithium strip L0 and the transfer film T are rolled into the two rolls 35, the lithium foil L1 intermittently adheres to the second release agent layer removing section E2 of the transfer film T to form the lithium film C, and the remaining part of the lithium foil L1 intermittently adheres to the first release agent layer G1 of the auxiliary film a. Thus, in fig. 2, the surface treatment mechanism 33 is used to intermittently remove the second release agent layer G2 of the transfer film T before entering the two rolls 35 to form the second release agent layer removing section E2 and the second release agent layer remaining section M2 which are alternately arranged, while the first release agent layer G1 of the auxiliary film a is not subjected to the removal treatment. Due to the processing by the surface processing mechanism 33, the surface roughness of the second separator S2 at the second release agent layer removing stage E2 is increased. The surface roughness of the second release film S2 at the second release agent layer removing stage E2 is greater than that of the first release agent layer G1.
Specifically, in the third embodiment shown in fig. 3, the surface roughness of the first release agent layer G1 is smaller than that of the second release agent layer G2, and after the auxiliary film a, the lithium strip L0 and the transfer film T are rolled into the two rolls 35, the lithium foil L1 intermittently adheres to the first release agent layer removing section E1 of the auxiliary film a, and the remaining part of the lithium foil L1 intermittently adheres to the second release agent layer G2 of the transfer film T to form the lithium film C. Thus, in fig. 3, the surface treatment mechanism 33 is used to intermittently remove the first release agent layer G1 of the auxiliary film a before entering the two rolls 35 to form the first release agent layer removing section E1 and the first release agent layer remaining section M1 which are alternately arranged, while the second release agent layer G2 of the transfer film T is not subjected to the removal treatment. Due to the processing by the surface processing mechanism 33, the surface friction of the first release film S1 at the first release agent layer removing stage E1 is increased. The surface roughness of the first release film S1 at the first release agent layer removing stage E1 is greater than that of the second release agent layer G2.
The surface treating mechanism 33 may take any suitable configuration.
In one embodiment, the surface treatment mechanism 33 is used to remove the first release agent layer G1 or the second release agent layer G2 with a laser. Specifically, as shown in fig. 4, the surface treatment mechanism 33 includes a computer 331, a laser 332, a collimator mirror 333, a holophote 334, a mirror 335, a focusing lens 336, and a CCD 337. The laser 332 is communicatively connected to the computer 331, and the laser 332 is configured to emit a laser beam that is capable of reaching the focusing lens 336 via the collimating mirror 333, the total reflection mirror 334, and the reflection mirror 335. Thereby, the laser beam reaches the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T through the focusing lens 336. A computer 331 is communicatively coupled to the laser 332 and the CCD337, the computer 331 being configured to adjust the intensity of the laser modulation laser beam. The laser beam can resonate with the first release film S1 of the auxiliary film a or the second release film S2 of the transfer film T or the laser beam can resonate with the release agent particles of the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T, thereby removing the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T. CCD337 is communicatively connected to computer 331, and CCD337 is used to locate the position of removal of the first release agent layer G1 of auxiliary film a or the second release agent layer G2 of transfer film T.
In another embodiment, the surface treatment mechanism 33 is used to remove the first release agent layer G1 or the second release agent layer G2 with sandpaper 339. Specifically, as shown in fig. 5, the surface treatment mechanism 33 includes a computer 331, a CCD337, a robot arm 338, and sandpaper 339. The robotic arm 338 is communicatively connected to the computer 331, the robotic arm 338 being adapted to press sandpaper 339 onto the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T, thereby enabling removal of the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T (i.e., rubbing with sandpaper 339); computer 331 is communicatively connected to robotic arm 338, computer 331 is used to control the processing time and processing range of sandpaper 339, CCD337 is communicatively connected to computer 331, and CCD337 is used to position a location to assist in the removal of first release agent layer G1 of film a or second release agent layer G2 of transfer film T.
The surface treatment mechanism 33 further includes a back roller 330 opposite to the robot arm 338 and supporting the first separation film S1 of the auxiliary film a or the second separation film S2 of the transfer film T, depending on the actual situation.
The lithium ribbon supply mechanism 34 is located upstream of the two nip rollers 35, and the lithium ribbon supply mechanism 34 is used to supply the lithium ribbon L0 between the two nip rollers 35. As shown in fig. 1 to 3, the lithium ribbon supply mechanism 34 is a roller, so that the lithium ribbon supply mechanism 34 serves to unreel the lithium ribbon L0 in a roll form.
The two rolls 35 are used to roll the auxiliary film a treated by the surface treatment mechanism 33 together with the transfer film T and the lithium tape L0 to roll the lithium tape L0 into a lithium foil L1 and adhere the lithium foil L1 to the transfer film T to form a lithium film C.
An auxiliary film take-up mechanism 36 is located downstream of the two nip rollers 35. The auxiliary film take-up mechanism 36 serves to take up the auxiliary film a passing between the two nip rollers 35 to recover the auxiliary film a while providing a traction force to the auxiliary film a. As shown in fig. 1 to 3, the auxiliary film take-up mechanism 36 is a roller, so that the auxiliary film take-up mechanism 36 takes up the auxiliary film a.
As shown in fig. 1 to 3, in the lithium film C formed by the mechanism 3 for lithium film formation, the distribution of the lithium foil L1 on the transfer film T corresponds to the distribution of the active material layer P02 on the current collector P01. In other words, when the active material layer P02 is continuously provided on the surface of the current collector P01, in the lithium film C formed by the mechanism 3 for lithium film formation, the lithium foil L1 is continuously distributed on the transfer film T; when the active material layers P02 are intermittently provided on the surface of the current collector P01, the lithium foil L1 is intermittently distributed on the transfer film T in the lithium film C formed by the mechanism for lithium film formation 3. Thus, based on the distribution of the lithium foil L1 on the transfer film T corresponding to the distribution of the active material layer P02 on the current collector P01, the lithium film C formed by the mechanism 3 for lithium film formation is supplied to the rolling mechanism 1 to perform continuous lithium replenishment or intermittent lithium replenishment of the pole piece P0. In addition, since the mechanism 3 for lithium film formation forms the lithium film C before the rolling mechanism 1 causes the lithium foil L1 in the lithium film C to adhere to the active material layer P02 to form the lithium supplement pole piece P1, there is no tailing phenomenon in the background art, no lithium residue (from the lithium foil L1) in the blank current collector region R, and thus no electrode assembly (i.e., a combination of the positive and negative pole pieces and the separator film) due to lithium residue and even potential safety hazard of the battery in manufacturing, based on the correspondence relationship between the distribution of the lithium foil L1 in the lithium film C on the transfer film T and the distribution of the active material layer P02 on the current collector P01 when used for intermittent lithium supplement.
The mechanisms 3 for lithium film formation are provided in one or two groups correspondingly depending on whether the active material layer P02 is provided on one or both surfaces of the current collector P01. In other words, when the active material layer P02 is provided on one surface of the current collector P01, the mechanism 3 for lithium film formation is provided as a set, and single-sided lithium supplement of the pole piece P0 is performed for one side of the pole piece P0 between the two press rollers 11 of the roll pressing mechanism 1; when the active material layer P02 is provided on both surfaces of the current collector P01, the mechanisms 3 for lithium film formation are provided in two sets as shown in fig. 1, thereby performing double-sided lithium replenishment of the pole piece P0.
In the mechanism 3 for lithium film formation, since the surface treatment mechanism 33 is used to remove the first release agent layer G1 of the auxiliary film a or the second release agent layer G2 of the transfer film T to increase the surface roughness of the corresponding portion in the first barrier film S1 or the second barrier film S2, the two rolls 35 can operate under a small rolling force condition, and the two rolls 35 are not easily deformed under a small rolling force condition, thereby achieving uniform adhesion of the lithium foil L1 having good thickness uniformity on the transfer film T.
Two press rolls 11 of the press mechanism 1 are used for rolling the lithium film C and the pole piece P0, so that the lithium foil L1 in the lithium film C adheres to the active material layer P02 to form a lithium supplement pole piece P1. In other words, the adhesion of lithium foil L1 to active material layer P02 is greater than the adhesion of lithium foil L1 to second separator S2 of transfer film T.
The transfer film take-up mechanism 4 is located downstream of the two press rollers 11. The transfer film take-up mechanism 4 serves to pass the lithium film C between the two pressing rollers 11 and take up the transfer film T in the lithium film C passing between the two pressing rollers 11 while providing a traction force of the lithium film C. As shown in fig. 1 to 3, the transfer film take-up mechanism 4 is a roller, so that the transfer film take-up mechanism 4 serves to take up the transfer film T. Likewise, in the case of employing the transfer film take-up mechanism 4, the mechanism 3 for lithium film formation and the transfer film take-up mechanism 4 are provided in one or two sets correspondingly in accordance with the arrangement of the active material layer P02 on one or both surfaces of the current collector P01.
The lithium supplement electrode sheet take-up mechanism 5 is located downstream of the two press rolls 11. The lithium supplement pole piece collecting mechanism 5 is used for collecting the lithium supplement pole piece P1 (namely, the pole piece P0 adhered with the lithium foil L1) and providing traction force for the pole piece P0. In fig. 1 to 3, the lithium supplement electrode sheet take-up mechanism 5 is a roller, and the lithium supplement electrode sheet take-up mechanism 5 is used for taking up the lithium supplement electrode sheet P1. Specifically, when active material layer P02 of replenished lithium electrode sheet P1 leaves the gap between two press rollers 11 and blank current collector region R of electrode sheet P0 enters the gap between two press rollers 11, the traction force provided by transfer film take-up mechanism 4 and the traction force provided by replenished lithium electrode sheet take-up mechanism 5 facilitate separation of lithium foil L1 from second separator S2 of transfer film T and adhesion to active material layer P02.
The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.
Claims (10)
1. A mechanism (3) for lithium film formation, characterized in that,
the mechanism (3) for forming the lithium film comprises an auxiliary film providing mechanism (31), a transfer film providing mechanism (32), a surface treatment mechanism (33), a lithium belt providing mechanism (34) and two rollers (35),
an auxiliary film supply mechanism (31) is located upstream of the two nip rollers (35), the auxiliary film supply mechanism (31) is used for supplying an auxiliary film (A) between the two nip rollers (35), the auxiliary film (A) comprises a first parting film (S1) and a first parting film agent layer (G1) arranged on the first parting film (S1),
a transfer film supply mechanism (32) is located upstream of the two nip rollers (35), the transfer film supply mechanism (32) is used for supplying a transfer film (T) between the two nip rollers (35), the transfer film (T) comprises a second parting film (S2) and a second parting film agent layer (G2) arranged on the second parting film (S2),
a lithium strip supply mechanism (34) is positioned upstream of the two rolls (35), the lithium strip supply mechanism (34) is used for supplying lithium strips (L0) between the two rolls (35),
a surface treatment mechanism (33) is located upstream of the two rolls (35), the surface treatment mechanism (33) is used for removing the first release agent layer (G1) of the auxiliary film (A) or the second release agent layer (G2) of the transfer film (T) before entering the two rolls (35) to increase the surface roughness of the corresponding part in the first isolating film (S1) or the second isolating film (S2),
two rolling rolls (35) are used to roll the auxiliary film (a) and the transfer film (T) together with the lithium tape (L0) to roll the lithium tape (L0) into a lithium foil (L1), and the lithium foil (L1) is adhered to the transfer film (T) to form a lithium film (C).
2. Mechanism (3) for lithium film forming according to claim 1, characterized by a surface treatment mechanism (33) for removing the first release agent layer (G1) or the second release agent layer (G2) with a laser.
3. Mechanism (3) for lithium film forming according to claim 2,
the surface processing mechanism (33) comprises a computer (331), a laser (332), a collimating mirror (333), a total reflection mirror (334), a reflecting mirror (335), a focusing lens (336) and a CCD (337);
the laser (332) is in communication connection with the computer (331), the laser (332) is used for emitting laser beams, and the emitted laser beams can reach the focusing lens (336) through the collimating mirror (333), the total reflection mirror (334) and the reflection mirror (335);
a CCD (337) communicatively connected to the computer (331), the CCD (337) for locating the location of removal of the first release agent layer (G1) or the second release agent layer (G2);
a computer (331) is communicatively coupled to the laser (332) and the CCD (337), the computer (331) being configured to adjust the intensity of the laser beam.
4. Mechanism (3) for lithium film forming according to claim 1, characterized in that the surface treatment mechanism (33) is used to remove the first release agent layer (G1) or the second release agent layer (G2) with sandpaper (339).
5. Mechanism (3) for lithium film forming according to claim 4,
the surface treatment mechanism (33) comprises a computer (331), a CCD (337), a mechanical arm (338) and sandpaper (339);
a robotic arm (338) communicatively connected to the computer (331), the robotic arm (338) for pressing sandpaper (339) onto the first release agent layer (G1) or the second release agent layer (G2) to enable removal of the first release agent layer (G1) or the second release agent layer (G2);
the computer (331) is communicatively connected to the mechanical arm (338), and the computer (331) is used for controlling the processing time and the processing range of the sand paper (339);
the CCD (337) is communicatively connected to the computer (331), the CCD (337) being used to locate the location of removal of the first release agent layer (G1) or the second release agent layer (G2).
6. The mechanism (3) for lithium film formation according to claim 1, wherein the mechanism (3) for lithium film formation further comprises an auxiliary film take-up mechanism (36), the auxiliary film take-up mechanism (36) being located downstream of the two rolls (35), the auxiliary film take-up mechanism (36) being for taking up the auxiliary film (a) passed between the two rolls (35).
7. A device for pole piece lithium supplement comprises a pole piece (P0) and a lithium supplement device, wherein the pole piece (P0) comprises a current collector (P01) and an active substance layer (P02) arranged on the surface of the current collector (P01), and the device for pole piece lithium supplement comprises a rolling mechanism (1) and a pole piece providing mechanism (2);
the rolling mechanism (1) comprises two pressing rollers (11);
a pole piece supply mechanism (2) is positioned at the upstream of the two compression rollers (11), the pole piece supply mechanism (2) is used for supplying a pole piece (P0) between the two compression rollers (11),
characterized in that the device for pole piece lithium replenishment further comprises a mechanism (3) for lithium film forming according to any one of claims 1 to 6, the mechanism (3) for lithium film forming being located upstream of the two pressing rollers (11), the distribution of the lithium foil (L1) on the transfer film (T) corresponding to the distribution of the active substance layer (P02) on the current collector (P01);
two press rolls (11) are used for rolling the lithium film (C) and the pole piece (P0) to adhere the lithium foil (L1) in the lithium film (C) to the active material layer (P02).
8. The device for supplementing lithium to a pole piece according to claim 7,
the device for supplementing lithium to the pole piece also comprises a transfer film collecting mechanism (4);
the transfer film take-up mechanism (4) is located downstream of the two press rollers (11), and the transfer film take-up mechanism (4) is used for enabling the lithium film (C) to pass between the two press rollers (11) and taking up the transfer film (T) in the lithium film (C) passing between the two press rollers (11).
9. The device for supplementing lithium to a pole piece according to claim 7,
the device for supplementing lithium to the pole piece also comprises a lithium supplementing pole piece collecting mechanism (5);
and the lithium supplement electrode sheet collecting mechanism (5) is positioned at the downstream of the two compression rollers (11), and the lithium supplement electrode sheet collecting mechanism (5) is used for collecting the electrode sheet (P0) adhered with the lithium foil (L1).
10. The device for pole piece lithium replenishment according to claim 7, characterized in that the mechanisms (3) for lithium film shaping are two sets, to provide lithium foil (L1) to both surfaces of the pole piece (P0).
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| CN201921050358.XU CN210040394U (en) | 2019-07-05 | 2019-07-05 | Mechanism for forming lithium film and device for supplementing lithium to pole piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276669A (en) * | 2020-02-12 | 2020-06-12 | 中国科学院宁波材料技术与工程研究所 | Pre-lithiation process of negative pole piece |
| CN114361398A (en) * | 2022-01-10 | 2022-04-15 | 天津中能锂业有限公司 | Method for producing lithium-doped negative electrode and lithium-doped negative electrode |
-
2019
- 2019-07-05 CN CN201921050358.XU patent/CN210040394U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276669A (en) * | 2020-02-12 | 2020-06-12 | 中国科学院宁波材料技术与工程研究所 | Pre-lithiation process of negative pole piece |
| CN111276669B (en) * | 2020-02-12 | 2022-07-05 | 中国科学院宁波材料技术与工程研究所 | Pre-lithiation process of negative pole piece |
| CN114361398A (en) * | 2022-01-10 | 2022-04-15 | 天津中能锂业有限公司 | Method for producing lithium-doped negative electrode and lithium-doped negative electrode |
| CN114361398B (en) * | 2022-01-10 | 2024-01-30 | 天津中能锂业有限公司 | Method for preparing lithium-supplementing negative electrode and lithium-supplementing negative electrode |
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