CN210576211U - Device for lithium supplement of pole piece - Google Patents

Device for lithium supplement of pole piece Download PDF

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Publication number
CN210576211U
CN210576211U CN201921048578.9U CN201921048578U CN210576211U CN 210576211 U CN210576211 U CN 210576211U CN 201921048578 U CN201921048578 U CN 201921048578U CN 210576211 U CN210576211 U CN 210576211U
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China
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lithium
pole piece
partition
film
providing
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CN201921048578.9U
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Chinese (zh)
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谢斌
陈仕通
龚志杰
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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Abstract

The utility model provides a device for pole piece lithium supplement, the pole piece comprises a current collector and an active substance layer arranged on the surface of the current collector, the part of the surface of the current collector, which is not provided with the active substance layer, is a blank current collector area, the device for pole piece lithium supplement comprises a rolling mechanism, a pole piece providing mechanism, a lithium film providing mechanism and a partition providing mechanism; the rolling mechanism comprises two pressing rollers; the pole piece providing mechanism is positioned at the upstream of the rolling mechanism and is used for providing pole pieces; a lithium film supply mechanism located upstream of the rolling mechanism for supplying a lithium film, the lithium film including a lithium foil; and the partition providing mechanism is positioned at the upstream of the rolling mechanism and is used for providing a partition on the surface of the blank current collecting area so that the lithium film is separated from the blank current collecting area, and the rolling mechanism is used for rolling the lithium film and the pole piece with the partition so that the lithium foil in the lithium film is adhered to the active material layer. Therefore, the rolling mechanism is used for forming a blank current collector area of the lithium supplement pole piece without lithium residue during rolling.

Description

Device for lithium supplement of pole piece
Technical Field
The utility model relates to an electrochemistry field, more specifically relates to a device that is used for lithium is mended to pole piece.
Background
In recent years, with the rapid development of electric vehicles, the energy density requirement of a power battery is more and more strict, and for a negative plate, part of lithium is consumed due to the formation of a Solid Electrolyte Interface (SEI) film in the first charging process of the battery, so that the loss of lithium serving as a positive electrode material is caused, the capacity of the battery is reduced, and the first efficiency is reduced. This is particularly evident in negative electrode sheets using alloy materials (e.g., silicon alloys, tin alloys, etc.) as active materials. In order to reduce the decrease in battery capacity due to the irreversible capacity of the battery during the first charge and discharge, some solutions have been adopted.
One of the solutions employs a device for pole piece lithium supplement, in which a lithium film providing mechanism is used for providing a lithium film, the lithium film includes a transfer film and a lithium foil, the lithium foil is continuously adhered to the transfer film and faces an active material layer of the pole piece, and the pole piece includes a current collector and an active material layer discontinuously disposed on the surface of the current collector. The rolling mechanism is used for rolling the lithium film and the pole piece, and the lithium foil in the lithium film is discontinuously adhered to the active material layer. However, in the device for pole piece lithium supplement, the rolling mechanism separates the continuous lithium foil in the lithium film from the transfer film, breaks the lithium foil and adheres to the active material layer during rolling, and the lithium foil has a tailing phenomenon in the blank current collector area, so that lithium residue exists in the blank current collector area of the formed lithium supplement pole piece.
SUMMERY OF THE UTILITY MODEL
In view of the problems existing in the prior art, the present invention provides a device for lithium is mended to pole piece, the roll pressing mechanism of the device for lithium is mended to pole piece is used for when rolling, even there is the trailing phenomenon, also can not have lithium to remain in the blank current collector district of the benefit lithium pole piece that forms.
In order to achieve the above object, the utility model provides a device for lithium is mended to pole piece, the pole piece includes the mass flow body and sets up the active material layer on the mass flow body surface, the part that does not set up the active material layer on the mass flow body surface is blank current-collecting body district, the device for lithium is mended to pole piece includes rolling mechanism, pole piece provides mechanism, lithium membrane provides mechanism and cuts off the thing and provides the mechanism; the rolling mechanism comprises two pressing rollers; the pole piece providing mechanism is positioned at the upstream of the rolling mechanism and is used for providing pole pieces between the two rollers; a lithium film supply mechanism located upstream of the rolling mechanism, the lithium film supply mechanism being for supplying a lithium film, the lithium film including a lithium foil; and the partition providing mechanism is positioned at the upstream of the rolling mechanism and is used for providing a partition on the surface of the blank current collecting area so that the lithium film is separated from the blank current collecting area, and the rolling mechanism is used for rolling the lithium film and the pole piece with the partition so that the lithium foil in the lithium film is adhered to the active material layer.
In one embodiment, the partition is a separator, and the partition providing mechanism includes a first robot for grasping the separator and placing the separator on the surface of the blank collector region.
In an embodiment, the partition is a separation film, and the device for lithium supplement of the pole piece further comprises a partition collecting mechanism, the partition collecting mechanism is located at the downstream of the rolling mechanism, and the partition collecting mechanism comprises a second mechanical arm, and the second mechanical arm is used for grabbing the separation film arranged on the surface of the blank current collecting area.
In one embodiment, the partition retrieving mechanism includes a storage box for storing the separator captured by the second robot corresponding to the empty collector region.
In one embodiment, the partition providing mechanism is a coating mechanism for providing a lubricating substance as a partition.
In one embodiment, the coating mechanism is a gravure coating mechanism, a transfer coating mechanism, or an extrusion coating mechanism.
In one embodiment, the device for pole piece lithium supplement further comprises a partition collecting mechanism, the partition collecting mechanism is located at the downstream of the rolling mechanism, and the partition collecting mechanism is a laser cleaning mechanism, a solvent cleaning mechanism or a physical cleaning mechanism.
In one embodiment, the physical cleaning mechanism comprises a cleaning roller and an adsorbate coated on the surface of the cleaning roller.
In one embodiment, the lithium film providing mechanism includes a transfer film providing mechanism, a lithium tape providing mechanism, and two rollers; the transfer film providing mechanism is used for providing the transfer film between the two rollers, the lithium strip providing mechanism is used for providing the lithium strip between the two rollers, the two rollers are used for rolling the lithium strip and the transfer film, so that the lithium strip is rolled into a lithium foil, and the lithium foil is adhered to the transfer film to form the lithium film.
In one embodiment, the lithium film providing mechanism is provided in one or two groups, respectively, depending on whether the active material layer is provided on one or both surfaces of the current collector.
The utility model has the advantages as follows: the lithium film is separated from the blank current collector region by the partition providing mechanism, so that when the rolling mechanism is used for rolling to separate the lithium foil in the lithium film from the transfer film and adhere the lithium foil to the active material layer, even if a tailing phenomenon exists, lithium residues (from the lithium foil) in the blank current collector region are separated by the partition, so that no lithium residues exist in the blank current collector region of the formed lithium supplement pole piece.
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 view of a first embodiment of a partition providing mechanism of a device for pole piece lithium supplement according to the present invention.
Fig. 4 is a schematic view of a second embodiment of a partition providing mechanism of a device for pole piece lithium supplement according to the present invention.
Fig. 5 is a schematic view of a third embodiment of a partition providing mechanism of a device for pole piece lithium supplement according to the present invention.
Fig. 6 is a schematic view of a fourth embodiment of a partition providing mechanism of a device for pole piece lithium supplement according to the present invention.
Fig. 7 is a schematic view of a first embodiment of a partition collecting mechanism of a device for pole piece lithium supplement according to the present invention.
Fig. 8 is a schematic view of a second embodiment of a partition collecting mechanism of the apparatus for pole piece lithium supplement according to the present invention.
Wherein the reference numerals are as follows:
1 rolling mechanism M1 gravure coating mechanism
11 pressure roller M11 accommodating groove
2 pole piece supply mechanism M12 gravure roller
P0 Pole piece M121 concave part
P01 mass collector M2 shifts coating mechanism
P02 active material layer M21 scraper
R blank collector M22 transfer roll
3 lithium film supply mechanism M3 extrusion coating mechanism
31 transfer film supply mechanism M31 accommodating tank
32 lithium belt supply mechanism M32 screw pump
33-roller M33 coating head
34 auxiliary film supply mechanism 5 partition receiving mechanism
35 auxiliary membrane collecting mechanism I partition
T transfer membrane S isolating membrane
A second manipulator for auxiliary film 51
L0 lithium belt 52 storage box
L1 lithium foil 53CCD
C lithium film 54 computer
4 partition supply mechanism 55 cleaning roller
41 first robot 56 suction
42 storage box 6 transfer film take-up mechanism
43CCD 7 lithium supplement electrode piece collecting mechanism
44 computer P1 lithium-supplementing 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 view of a first embodiment of a partition providing mechanism 4 of a device for pole piece lithium supplement according to the present invention. Fig. 4 is a schematic view of a second embodiment of a partition providing mechanism 4 of a device for pole piece lithium supplement according to the present invention. Fig. 5 is a schematic view of a third embodiment of the partition providing mechanism 4 of the device for pole piece lithium supplement according to the present invention. Fig. 6 is a schematic view of a fourth embodiment of the partition providing mechanism 4 of the device for pole piece lithium supplement according to the present invention. Fig. 7 is a schematic view of a first embodiment of a partition collecting mechanism 5 of the device for pole piece lithium supplement according to the present invention. Fig. 8 is a schematic view of a second embodiment of partition collecting mechanism 5 of the device for pole piece lithium supplement according to the present invention.
As shown in fig. 1 and 2, the device for pole piece lithium supplement includes a rolling mechanism 1, a pole piece providing mechanism 2, a lithium film providing mechanism 3, and a partition providing mechanism 4. According to the actual situation, the device for pole piece lithium supplement can also comprise a partition collecting mechanism 5. According to the actual situation, the device for supplementing lithium to the pole piece can also comprise a transfer film collecting mechanism 6. According to the actual situation, the device for pole piece lithium supplement can also comprise a lithium supplement pole piece collecting mechanism 7. The pole piece P0 includes a current collector P01 and an active material layer P02 disposed on the surface of the current collector P01, and the portion of the surface of the current collector P01 where the active material layer P02 is not disposed is a blank current collector region R. In fig. 1 and 2, the discontinuous active material layer P02 is flanked by a blank current collector region R, that is, a portion on the surface of the current collector P01 where the active material layer P02 is not provided. In fig. 1 and 2, 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. 1 and 2, active material layers P02 on both surfaces of current collector P01 are symmetrically distributed with respect to current collector P01, and of course, active material layers P02 on both surfaces of current collector P01 may be asymmetrically distributed with respect to current collector P01. Of course, the active material layer P02 may be provided on only one surface 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 mechanism 2 is located upstream of the rolling mechanism 1. The pole piece supply mechanism 2 is used to supply a pole piece P0 between two pressure rollers 11.
The lithium film supply mechanism 3 is located upstream of the rolling mechanism 1. The lithium film providing mechanism 3 is for providing a lithium film C. The lithium film C includes a lithium foil L1. The lithium film C further includes a transfer film T. The lithium foil L1 was continuously adhered to the transfer film T.
The lithium film supply mechanism 3 includes a transfer film supply mechanism 31, a lithium tape supply mechanism 32, and two nip rollers 33. The lithium film supplying mechanism 3 may further include an auxiliary film supplying mechanism 34 depending on the actual situation. The lithium film supplying mechanism 3 may further include an auxiliary film take-up mechanism 35 depending on the actual situation.
The transfer film supply mechanism 31 is for supplying the transfer film T between the two rollers 33. As shown in fig. 1 and 2, the transfer film supply mechanism 31 is a roller, so that the transfer film supply mechanism 31 is used to unwind the transfer film T in the form of a roll.
The lithium ribbon supply mechanism 32 is used to supply the lithium ribbon L0 between the two rolls 33. As shown in fig. 1 and 2, the lithium ribbon supply mechanism 32 is a roller, so that the lithium ribbon supply mechanism 32 serves to unreel the lithium ribbon L0 in a roll form.
Two rolls 33 are used to roll the lithium tape L0 and the transfer film T 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.
The auxiliary film supply mechanism 34 is for supplying the auxiliary film a between the two nip rollers 33. In this case, two rollers 33 are used to roll the auxiliary film a, the lithium tape L0, and the transfer film T. In this case, the adhesion between the lithium foil L1 and the transfer film T is greater than the adhesion between the lithium foil L1 and the auxiliary film a. As shown in fig. 1 and 2, the auxiliary film supply mechanism 34 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 auxiliary film take-up mechanism 35 serves to take up the auxiliary film a passing between the two rolls 33 to recover the auxiliary film a while providing a traction force to the auxiliary film a. As shown in fig. 1 and 2, the auxiliary film take-up mechanism 35 is a roller, so that the auxiliary film take-up mechanism 35 serves to take up the auxiliary film a.
Note that the auxiliary film supply mechanism 34 and the auxiliary film take-up mechanism 35 may be omitted, and in this case, the adhesion between the lithium foil L1 and the transfer film T is only required to be greater than the adhesion between the lithium foil L1 and the nip roller 33 (on the side of the lithium foil L1 opposite to the transfer film T), and the lithium foil L1 can be continuously adhered to the transfer film T to form the lithium film C.
The lithium film providing mechanisms 3 are correspondingly provided in one or two groups in accordance with the arrangement of the active material layer P02 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 lithium film supply mechanism 3 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 lithium film providing mechanism 3 is provided in two sets as shown in fig. 1, thereby achieving double-sided lithium replenishment of the pole piece P0. Likewise, in the case of employing the transfer film take-up mechanism 6, the lithium film supply mechanism 3 and the transfer film take-up mechanism 6 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 partition providing mechanism 4 is located upstream of the rolling mechanism 1. The partition providing mechanism 4 is for providing a partition I on the surface of the blank current collector region R so that the lithium film C is partitioned from the blank current collector region. Preferably, the entire surface of the empty collector region R is covered by the partition I.
The partition I provided by the partition providing mechanism 4 may be of various types.
In an embodiment, referring to fig. 1 and 3, the partition I provided by the partition providing mechanism 4 is a separation film S. Preferably, the surface of the separator S is smooth. The thickness of the separation film S may be slightly larger than that of the active material layer P02 in consideration of elastic deformation of the separation film S.
Accordingly, the partition providing mechanism 4 includes a first robot 41. The partition providing mechanism 4 may further include a storage box 42, a CCD43, and a computer 44, depending on the actual situation. The first robot 41 is used to grasp the separator S and place the separator S on the surface of the blank current collector region R. The storage box 42 is used for storing the isolation film S corresponding to the length of the blank current collector region R of the pole piece P0 for the first manipulator 41 to grab, the CCD43 is used for facing the pole piece P0 to perform image acquisition to determine the relative position between the isolation film S and the blank current collector region R, and the computer 44 is used for being in communication connection with the CCD43 and the first manipulator 41 so as to control the operation of the first manipulator 41 for providing the isolation film S through the position of the isolation film S and the blank current collector region R determined by the CCD 43.
In another embodiment, in conjunction with fig. 2 and 4 to 6, the partition I provided by the partition providing mechanism 4 is a lubricating substance (not shown). The thickness of the lubricating substance is smaller than that of active material layer P02 in order not to overflow the lubricating substance. Accordingly, the partition providing mechanism 4 is a coating mechanism. Specifically, the coating mechanism is a gravure coating mechanism M1, a transfer coating mechanism M2, or a squeeze coating mechanism M3.
As shown in fig. 4, the gravure coating mechanism M1 includes a storage tank M11 and a gravure roll M12. The housing groove M11 houses a lubricating substance, the gravure roll M12 is disposed adjacent to the blank current collector region R of the pole piece P0, the gravure roll M12 has recesses M121 disposed at intervals in the circumferential direction and extending in the circumferential direction, and the gravure roll M12 draws the lubricating substance from the housing groove M11 through the recesses M121 during rotation and applies the lubricating substance to the surface of the corresponding blank current collector region R of the pole piece P0. Gravure roll M12 was rotated periodically to achieve intermittent coating.
As shown in fig. 5, the transfer coating mechanism M2 includes a doctor M21 and a transfer roll M22. Doctor blade M21 contains a lubricating substance and is adjacent to transfer roll M22, transfer roll M22 being used adjacent to the corresponding blank collector region R of pole piece P0. The doctor blade M21 transferred the lubricating substance on the surface of the transfer roller M22, and the lubricating substance transferred on the surface of the transfer roller M22 contacted and coated on the surface of the corresponding blank current collector region R of the pole piece P0. The blade M21 was able to spring open periodically to achieve intermittent coating.
As shown in fig. 6, the squeeze coating mechanism M3 includes a storage tank M31, a screw pump M32, and a coating head M33. The housing tank M31 houses a lubricating substance, the screw pump M32 delivers the lubricating substance to the coating head M33, and the coating head M33 is used to coat the lubricating substance on the surface of the corresponding empty collector region R of the pole piece P0. The coating head M33 may be set to timed feed and retract modes to achieve intermittent coating.
Note that, whether partition I provided by partition providing mechanism 4 is separator S1 or a lubricating substance, partition I may or may not adhere to lithium foil L1 or lithium foil L1 as long as it can be taken up (i.e., removed) by partition take-up mechanism 5.
The rolling mechanism 1 is used for rolling the lithium film C and the pole piece P0 with the partition I, so that the lithium foil L1 in the lithium film C adheres to the active material layer P02, thereby forming a lithium supplement pole piece P1. The lithium foil L1 corresponding to the blank current collector region R in the lithium film C remains on the transfer film T. In other words, the adhesion between lithium foil L1 and transfer film T is smaller than the adhesion between lithium foil L1 and active material layer P02.
The partition receiving mechanism 5 is located downstream of the rolling mechanism 1. The partition collecting mechanism 5 is used for collecting the partition I which passes through the two pressing rollers 11 and remains on the blank current collecting region R, so as to recover the partition I, and eliminate the hidden trouble of the battery in manufacturing and even safety caused by the adoption of the electrode assembly (namely, the assembly formed by the positive and negative electrode plates and the isolating membrane for the electrode assembly) of the lithium supplement plate P1 for the residue of the partition I.
The partition receiving mechanism 5 adopts an appropriate configuration corresponding to the type of the partition I provided by the partition providing mechanism 4.
Referring to fig. 1, 3 and 7, when the partition I provided by the partition providing mechanism 4 is the separation film S, the partition collecting mechanism 5 includes a second robot 51. Depending on the actual situation, partition collection mechanism 5 may also include storage box 52, CCD 53, and computer 54. The second robot arm 51 is used to grasp the separator S placed on the surface of the blank current collector region R. The storage box 52 is used for storing the separator S captured by the second robot 51 corresponding to the blank collector region R, and when the separator S in the storage box 52 is stored to a certain number, it can be replaced with the storage box 42 in the partition providing mechanism 4 for recycling. The CCD 53 is used for carrying out image acquisition on the lithium supplement pole piece P1 to determine the relative position of the isolation film S and the active material layer P02, and the computer 54 is used for being in communication connection with the CCD 53 and the second manipulator 51 so as to control the operation of the second manipulator 51 for grabbing the isolation film S according to the relative position of the isolation film S and the active material layer P02 determined by the CCD 53. In an alternative embodiment, partition retrieving mechanism 5 may be implemented using a robot.
Referring to fig. 2, 4 to 6 and 8, when the partition I provided by the partition providing mechanism 4 is a lubricating substance, the partition collecting mechanism 5 is a laser cleaning mechanism, a solvent cleaning mechanism or a physical cleaning mechanism. Further, as shown in fig. 8, the physical cleaning mechanism includes a cleaning roller 55 and an absorbent 56 coated on a surface of the cleaning roller 55. The absorbent article 56 may be a sponge, absorbent fabric, or the like. The surface of the cleaning roller 55 may have fine pores through which a cleaning agent may flow to the surface of the cleaning roller 55, and the adsorbate 56 of the surface of the cleaning roller 55 may absorb the cleaning agent, thereby cleaning the surface of the lithium supplement electrode sheet P1 coated with the lubricating substance. In an alternative embodiment, the physical cleaning mechanism may employ suction, such as a vacuum, to clean the lubricating substance. In addition, the partition collecting mechanism 5 may be provided with a computer (not shown) for controlling the gap between the cleaning roller 55 and the lithium supplement electrode sheet P1, and the cleaning time and the cleaning range may be controlled by the computer. The lubricating substance may be a conventional lubricating oil.
The transfer film take-up mechanism 6 is located downstream of the rolling mechanism 1. The transfer film take-up mechanism 6 serves to take up the transfer film T passing through the two pressing rollers 11 together with the lithium foil L1 remaining on the portion of the transfer film T while providing a traction force of the lithium film C. As shown in fig. 1 and 2, the transfer film take-up mechanism 6 is a roller, so that the transfer film take-up mechanism 6 is used to take up the transfer film T.
The lithium supplement electrode sheet collecting mechanism 7 is positioned at the downstream of the rolling mechanism 1. And the lithium supplement electrode piece collecting mechanism 7 is used for collecting the lithium supplement electrode piece P1 and simultaneously providing the traction force of the electrode piece P0. In fig. 1 and 2, the lithium supplement electrode sheet take-up mechanism 7 is a roller, and the lithium supplement electrode sheet take-up mechanism 7 is used for taking up the lithium supplement electrode sheet P1. Specifically, when the active material layer P02 of the replenished lithium electrode sheet P1 leaves the gap between the two press rolls 11 and the blank current collector region R of the electrode sheet P0 enters the gap between the two press rolls 11, the lithium foil L1 attached to the active material layer P02 of the replenished lithium electrode sheet P1 and the remaining lithium foil L1 on the transfer film T are disconnected based on the traction force provided by the transfer film take-up mechanism 6, the traction force provided by the replenished lithium electrode sheet take-up mechanism 7 and the adhesion force of the transfer film T to the lithium foil L1, and the remaining portion of the lithium foil L1 other than that intermittently adhered to the active material layer P02 intermittently remains intermittently on the transfer film T as the intermittent active material layer P02 continuously enters the gap between the two press rolls 11 and then comes out of the gap between the two press rolls 11.
In the device for lithium is mended to pole piece according to the utility model discloses a be used for providing wall thing I to the surface of blank current collector district R through wall thing providing mechanism 4, make lithium film C and blank current collector district R separated to rolling mechanism 1 is used for when the calendering is in order to adhere lithium foil L1 in lithium film C to active material layer P02, even there is the trailing phenomenon, lithium in blank current collector district R remains (from lithium foil L1) also can be separated by wall thing I, thereby there is not lithium to remain in the blank current collector district R of mending lithium pole piece P1.
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 device for lithium supplement of a pole piece is characterized by comprising a rolling mechanism (1), a pole piece providing mechanism (2), a lithium film providing mechanism (3) and a partition providing mechanism (4), 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 part of the surface of the current collector (P01) where the active substance layer (P02) is not arranged is a blank current collector area (R);
the rolling mechanism (1) comprises two pressing rollers (11);
the pole piece providing mechanism (2) is positioned at the upstream of the rolling mechanism (1), and the pole piece providing mechanism (2) is used for providing a pole piece (P0) between the two rolling rollers (11);
a lithium film supply mechanism (3) is positioned at the upstream of the rolling mechanism (1), the lithium film supply mechanism (3) is used for supplying a lithium film (C), and the lithium film (C) comprises a lithium foil (L1);
a partition providing mechanism (4) located upstream of the rolling mechanism (1), the partition providing mechanism (4) for providing a partition (I) onto the surface of the blank current collector region (R) so that the lithium film (C) is separated from the blank current collector region (R);
the rolling mechanism (1) is used for rolling the lithium film (C) and the pole piece (P0) with the partition (I) so as to enable the lithium foil (L1) in the lithium film (C) to be adhered to the active material layer (P02).
2. The device for pole piece lithium supplement according to claim 1, characterized in that the partition (I) is a separation film, and the partition providing mechanism (4) comprises a first manipulator (41), and the first manipulator (41) is used for grabbing the separation film (S) and placing the separation film (S) on the surface of the blank current collecting area (R).
3. The device for pole piece lithium supplement of claim 2, wherein the partition (I) is a separation film, the device for pole piece lithium supplement further comprises a partition take-up mechanism (5), the partition take-up mechanism (5) is located at the downstream of the rolling mechanism (1), the partition take-up mechanism (5) comprises a second manipulator (51), and the second manipulator (51) is used for grabbing the separation film (S) placed on the surface of the blank current collecting region (R).
4. The apparatus for pole piece lithium supplement of claim 3, wherein the partition collecting mechanism further comprises a storage box (52), the storage box (52) is used for storing the separator (S) which is captured by the second manipulator (51) and corresponds to the blank current collector region (R).
5. The device for pole piece lithium supplement of claim 1, characterized in that the partition providing mechanism (4) is a coating mechanism for providing a lubricating substance as the partition (I).
6. The device for pole piece lithium supplement of claim 5, characterized in that the coating mechanism is a gravure coating mechanism (M1), a transfer coating mechanism (M2) or a squeeze coating mechanism (M3).
7. The device for pole piece lithium supplement of claim 6, further comprising a partition material taking-up mechanism (5), wherein the partition material taking-up mechanism (5) is located at the downstream of the rolling mechanism (1), and the partition material taking-up mechanism (5) is a laser cleaning mechanism, a solvent cleaning mechanism or a physical cleaning mechanism.
8. The device for supplementing lithium to a pole piece according to claim 7,
the physical cleaning mechanism comprises a cleaning roller (55) and an adsorbate (56) coated on the surface of the cleaning roller (55).
9. The device for lithium supplement of the pole piece according to claim 1,
the lithium film providing mechanism (3) comprises a transfer film providing mechanism (31), a lithium belt providing mechanism (32) and two rollers (33);
the transfer film providing mechanism (31) is used for providing the transfer film (T) between the two rollers (33), the lithium strip providing mechanism (32) is used for providing the lithium strip (L0) between the two rollers (33), the two rollers (33) are used for rolling the lithium strip (L0) and the transfer film (T) so as to roll the lithium strip (L0) into a lithium foil (L1) and enable the lithium foil (L1) to adhere to the transfer film (T) to form the lithium film (C).
10. The device for pole piece lithium supplement of claim 1, characterized in that the lithium film providing mechanism (3) is arranged in one or two groups correspondingly according to the active material layer (P02) arranged on one or two surfaces of the current collector (P01).
CN201921048578.9U 2019-07-05 2019-07-05 Device for lithium supplement of pole piece Active CN210576211U (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186132A (en) * 2019-07-05 2021-01-05 宁德时代新能源科技股份有限公司 Device for lithium supplement of pole piece

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186132A (en) * 2019-07-05 2021-01-05 宁德时代新能源科技股份有限公司 Device for lithium supplement of pole piece
CN112186132B (en) * 2019-07-05 2024-08-09 宁德时代新能源科技股份有限公司 Device for supplementing lithium to pole piece

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