CN217719665U - Pole piece prelithiation device - Google Patents

Pole piece prelithiation device Download PDF

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Publication number
CN217719665U
CN217719665U CN202221093610.7U CN202221093610U CN217719665U CN 217719665 U CN217719665 U CN 217719665U CN 202221093610 U CN202221093610 U CN 202221093610U CN 217719665 U CN217719665 U CN 217719665U
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China
Prior art keywords
pole piece
film
lithium
stripping
support film
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CN202221093610.7U
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Chinese (zh)
Inventor
齐大志
程滋平
刘慧芳
陈强
牟瀚波
吴春敢
董方圆
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China Energy Lithium Co ltd
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China Energy Lithium Co ltd
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Priority to CN202221093610.7U priority Critical patent/CN217719665U/en
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The utility model discloses a pole piece prelithiation device. The pole piece prelithiation device includes: the lithium film unwinding shaft is used for unwinding a lithium film coil stock, and the lithium film comprises a support film and lithium foil taking the support film as a carrier; a pole piece unreeling shaft used for unreeling the pole piece; the rolling device is used for rolling the pole piece and the lithium film and comprises an upper rolling roller and a lower rolling roller which are oppositely arranged; the stripping knife is used for stripping the support film from the pre-lithiated pole piece and comprises a knife body and a knife edge; a stripping angle control component for controlling the stripping angle of the support film and the pole piece after pre-lithiation; a support film winding shaft for winding the support film and a pole piece winding shaft for winding the pole piece after pre-lithiation. The utility model discloses a pole piece lithiation device in advance can control the angle that peels off from the pole piece after lithiation in advance of supporting the membrane to make it peel off from the pole piece after lithiation in advance with minimum power supporting the membrane, avoided the phenomenon that active material peeled off on the pole piece.

Description

Pole piece prelithiation device
Technical Field
The utility model relates to a battery manufacturing technology field especially relates to a pole piece lithiation device in advance.
Background
The lithium battery is widely applied to the fields of aerospace, computers, mobile communication equipment, robots, electric automobiles and the like due to the advantages of high energy density, long cycle life and wide applicable temperature range. With the development of society and the progress of science and technology, the requirements on the energy density and the cycle life of a lithium battery are higher and higher, but the lithium ion battery which only uses graphite as a negative electrode at present cannot meet the social expectation, so that the development of a novel positive and negative electrode material with higher specific capacity is needed. For the negative electrode material, the pre-lithiation work is carried out, so that the specific energy of the battery can be effectively improved, and the service life of the battery can be prolonged. Lithium metal has a high specific capacity (3860 mAh/g, 10 times that of graphite negative electrodes) and a lowest redox potential (-3.04V VS standard hydrogen potential). The lithium metal is adopted to carry out pre-lithiation treatment on the cathode of the traditional lithium ion battery, so that the first coulombic efficiency of the battery can be improved, the specific energy of the battery can be increased, the cycle life of the battery can be effectively prolonged, and the lithium ion battery has a wider application field.
The existing pre-lithiation technology is to roll a lithium film and a pole piece containing ultrathin lithium foil by a rolling device, and then strip a support film from the pole piece, so that the lithium foil is adhered to the pole piece, and lithium supplement is realized. However, when the peeling force of the support film is greater than the adhesive force of the active material on the pole piece, the active material on the pole piece will be peeled off and adhered to the lithium film, resulting in the loss of the pole piece.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of prior art, the utility model provides a novel easy operation, reliable pole piece lithiation device in advance, its angle of peeling off that can control support membrane and pole piece makes it peel off from the pole piece with less power, has avoided the phenomenon that active material peeled off on the pole piece.
The purpose of the utility model can be realized by the following technical scheme.
A pole piece prelithiation device, characterized in that includes:
the lithium film unreeling shaft is used for unreeling a lithium film coil stock, and the lithium film comprises a support film and lithium foil taking the support film as a carrier;
a pole piece unreeling shaft used for unreeling a pole piece to be pre-lithiated;
the rolling device is used for rolling the pole piece and the lithium film and comprises an upper rolling roller and a lower rolling roller which are oppositely arranged;
the stripping knife is used for stripping the support film from the pre-lithiated pole piece and comprises a knife body and a knife edge;
a stripping angle control component for controlling the stripping angle of the support film and the pole piece after pre-lithiation;
a support film winding shaft for winding the support film; and
a pole piece winding shaft used for winding the pole piece after pre-lithiation,
wherein the content of the first and second substances,
the lithium film unreeling shaft and the pole piece unreeling shaft are both arranged at the upstream of the rolling device;
the stripping knife, the stripping angle control assembly, the supporting film winding shaft and the pole piece winding shaft are arranged at the downstream of the rolling device.
Alternatively, the stripper knife has a relatively sharp edge, and the edge is not too sharp.
Optionally, the peel angle control assembly comprises a guide member, a sliding plate, a peel support roller, a locking knob, and a fixed seat; wherein the peeling supporting roller and the locking knob are fixedly attached to the sliding plate.
Optionally, the peeling support roller, the locking knob and the sliding plate may be moved on the guide member when the locking knob is released; when the locking knob is screwed, the peeling support roller, the locking knob and the sliding plate are locked and cannot move.
Optionally, the relative position of the peeling support roller is adjusted to control the peeling angle of the support film and the pre-lithiated pole piece.
Optionally, when producing a fixed product, a fixed support roller may be used to be installed in the position of the peeling support roller in the peeling angle control assembly of the present invention, replacing the peeling angle control assembly of the present invention under the condition of ensuring the same peeling angle.
Optionally, the pole piece prelithiation device is further provided with at least one deviation rectifying assembly, where the deviation rectifying assembly is arranged in at least one of the following positions:
a lithium film unreeling shaft and a rolling device;
the pole piece unreeling shaft is arranged between the pole piece unreeling shaft and the rolling device;
a peeling angle control assembly and a supporting film winding shaft; and
between the stripping knife and the pole piece winding shaft.
Optionally, the pole piece prelithiation device further comprises a tension control device.
Optionally, the tension control device comprises a plurality of tension control elements arranged upstream of the rolling device, and the tension control elements are respectively used for controlling the unreeling tension of the lithium film and the pole piece.
Optionally, the tension control device includes a plurality of tension control elements disposed downstream of the rolling device, and the tension control elements are respectively configured to control the winding tension of the support film and the pre-lithiated pole piece.
The technical scheme of the utility model one of following advantage has at least:
1. a stripping angle control assembly is arranged at the downstream of the rolling device and is matched with a stripping knife, so that the stripping angle of the support film and the pole piece can be adjusted at will, and the optimal stripping angle can be selected for different products;
2. the stripping knife comprises a knife body and a knife edge, and the support film is stripped from the pole piece through the knife edge, so that the included angle between the support film and the pole piece is the stripping angle in the real sense, rather than the included angle between the support film and the pole piece after bypassing the support roll in the prior art as the stripping angle (in the prior art, the actual stripping angle is always an acute angle and only depends on the diameter of the support roll).
Drawings
Fig. 1 is a schematic diagram of the pole piece prelithiation apparatus of the present invention.
Fig. 2 is a schematic view of the peel angle control assembly of fig. 1.
Fig. 3 is a partially enlarged schematic view of the rolling device of fig. 1.
Fig. 4 is a schematic view of the peel knife of fig. 1.
Description of the figure numbers:
l1 lithium film L2 lithium foil P pole piece
P1 prelithiation pole piece 10 lithium membrane unreel 20 pole piece unreel 30 rolling device
31 upper stitching rollers 32 lower stitching rollers 40 stripping knife 41 blade
42 cutter body 50 peeling angle control assembly 51 guide member 52 sliding plate
53 peeling support roller 54 locking knob 55 fixing base 60 rolling support roller
70 support membrane rolling axle 80 pole piece rolling axle
Detailed Description
The following describes a specific embodiment of the present invention. It is to be understood that other various embodiments can be devised and modified by those skilled in the art in light of the teachings of this disclosure without departing from the scope or spirit of the invention. The following detailed description is, therefore, not to be taken in a limiting sense.
Fig. 1 shows a schematic diagram of an embodiment of the pole piece prelithiation apparatus of the present invention, and fig. 3 shows a partial enlarged view of the rolling device 30. As shown in fig. 1-4, the pole piece prelithiation apparatus includes:
a pole piece unwinding shaft 20, said pole piece unwinding shaft 20 being located upstream of the rolling device 30;
the lithium film unreeling shaft 10 comprises an upper lithium film unreeling shaft and a lower lithium film unreeling shaft, and the upper lithium film unreeling shaft 10 is positioned above the pole piece unreeling shaft 20; the lower lithium film unreeling shaft 10 is positioned below the pole piece unreeling shaft 20;
and a rolling device 30 including upper and lower rolling rollers 31 and 32 disposed oppositely (in parallel). The rolling device 30 is used for performing rolling treatment on the pole piece P and the lithium film L, so that the lithium foil L2 on the rolled lithium film L is separated from the support film L1 and is adhered to the pole piece P;
a stripping blade 40, wherein the stripping blade 40 comprises a blade body 42 and a blade edge 41; so that the peeling angle between the support film L1 and the pre-lithiated pole piece P1 is the included angle between the support film L1 and the pre-lithiated pole piece P1.
A peeling angle control assembly 50, the peeling angle control assembly 50 comprising a fixing base 55, a guide member 51, a sliding plate 52, a peeling support roller 53 and a locking knob 54; the peeling support roller 53 and the locking knob 54 are fixedly attached to the slide plate 52. When the locking knob 54 is released, the peeling assembly 53, the locking knob 54 and the slide plate 52 can move on the guide member 51; when locking knob 54 is locked, stripper assembly 53, locking knob 54 and slide plate 52 are stationary relative to guide member 51 and cannot move.
The support film winding shaft 70 is used for winding the rest support film L1 after the lithium film L is stripped from the lithium foil L2;
and the pole piece winding shaft 80 is used for winding the pole piece P1 after pre-lithiation.
In specific operation, a pole piece P to be pre-lithiated is firstly fixed on the pole piece unwinding shaft 20, and then the tail end of the pole piece P is fixed on the pole piece winding shaft 80 after passing through a gap between the upper rolling roller 31 and the lower rolling roller 32 of the rolling device 30 and being wound from the winding support roller 60. Subsequently, the upper lithium film L is mounted on the upper lithium film unreeling shaft 10, the surface of the upper lithium film unreeling shaft carrying the lithium foil L2 is arranged opposite to the pole piece P, the upper lithium film L is positioned above the pole piece P to be pre-lithiated, then the lithium film L is drawn to pass through the gap between the upper rolling roller 31 and the lower rolling roller 32 of the rolling device 30, passes through the gap between the upper stripping knife 40 and the lower stripping knife 40, bypasses the stripping support roller 53 on the upper stripping angle control assembly 50, and finally is fixed on the upper support film reeling shaft 70. One side of the lower lithium film L carrying the lithium foil L2 is arranged opposite to the pole piece P, so that the lower lithium film L is positioned below the pole piece P to be pre-lithiated, and then the lithium film L is pulled to pass through a gap between an upper rolling roller 31 and a lower rolling roller 32 of a rolling device 30, passes through a gap between an upper stripping knife 40 and a lower stripping knife 40, bypasses a stripping support roller 53 on a lower stripping angle control assembly 50, and is fixed on a lower support film winding shaft 70.
Referring to fig. 1 and fig. 3, the prelithiation device is started to operate, the gap between the upper rolling roller 31 and the lower rolling roller 32 of the rolling device 30 is reduced, the lithium film L (including the upper lithium film and the lower lithium film) and the pole piece P are pressed, and after the pressure is pressed, the support film L on the lithium film L is peeled off from the pole piece P1, so that the lithium foil L2 on the lithium film L is adhered to the pole piece P to complete the prelithiation of the pole piece, and the prelithiation pole piece P1 is formed. After rolling, the lithium film L only remains the support film L1, and the remaining support film L1 is wound by the support film winding shaft 40.
In this embodiment, the edge 41 of the stripper blade 40 is sharp but not too sharp to prevent the support membrane from being cut or severed.
In this embodiment, the peeling angle control assembly 50 is set for producing different products or products with different specifications and performances, so that the proper peeling angle can be adjusted for different products. When the apparatus is used to produce a specific product or a product having the same peel angle, the peel angle control assembly 50 of the present invention may be replaced with a fixed support roller.
In this embodiment, the peeling blade 40 is integrally formed and includes a blade body 42 and a blade edge 41. In other certain embodiments, a split design can be adopted, and the cutting edge 41 is taken as an independent part, so that the cutting edge 41 is convenient to replace independently after long-time working is worn, and the equipment maintenance cost and time are reduced.
Although the present invention has been disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims (8)

1. A pole piece prelithiation device, comprising:
the lithium film unwinding shaft is used for unwinding a lithium film coil stock, and the lithium film comprises a support film and lithium foil taking the support film as a carrier;
a pole piece unreeling shaft used for unreeling a pole piece to be pre-lithiated;
the rolling device is used for rolling the pole piece and the lithium film and comprises an upper rolling roller and a lower rolling roller which are oppositely arranged;
the stripping knife is used for stripping the support film from the pre-lithiated pole piece and comprises a knife body and a knife edge;
a peeling angle control component for controlling the peeling angle of the support film and the pre-lithiated pole piece;
a support film winding shaft for winding the support film; and
a pole piece winding shaft used for winding the pole piece after pre-lithiation,
wherein the content of the first and second substances,
the lithium film unreeling shaft and the pole piece unreeling shaft are both arranged at the upstream of the rolling device;
the stripping knife, the stripping angle control assembly, the supporting film winding shaft and the pole piece winding shaft are arranged at the downstream of the rolling device.
2. The pole piece prelithiation apparatus of claim 1, wherein the peel angle control assembly comprises a guide element, a slide plate, a peel back-up roll, a locking knob, and a holder; wherein the peeling supporting roller and the locking knob are fixedly attached to the sliding plate.
3. The pole piece prelithiation apparatus of claim 2, wherein the stripping support roller, locking knob and slide plate are movable on the guide member when the locking knob is released; when the locking knob is screwed, the peeling support roller, the locking knob and the sliding plate are locked and cannot move.
4. The pole piece prelithiation apparatus of claim 2, wherein the angle of separation of the support film from the prelithiated pole piece is controlled by adjusting the position of the separation support roll.
5. The pole piece prelithiation apparatus of claim 1, wherein said pole piece prelithiation apparatus is further provided with at least one deviation rectifying component, said deviation rectifying component being provided in at least one of the following positions:
a lithium film unreeling shaft and a rolling device;
the pole piece unreeling shaft is arranged between the pole piece unreeling shaft and the rolling device;
a peeling angle control assembly and a supporting film winding shaft; and
between the stripping knife and the pole piece winding shaft.
6. The pole piece prelithiation apparatus of claim 1, in which said pole piece prelithiation apparatus further comprises a tension control device.
7. The pole piece prelithiation apparatus of claim 6, wherein the tension control apparatus comprises a plurality of tension control elements disposed upstream of the rolling apparatus for controlling the unwinding tension of the lithium film and the pole piece, respectively.
8. The pole piece prelithiation apparatus of claim 6, wherein the tension control device comprises a plurality of tension control elements disposed downstream of the rolling device for controlling the winding tension of the support film and the prelithiated pole piece, respectively.
CN202221093610.7U 2022-05-09 2022-05-09 Pole piece prelithiation device Active CN217719665U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221093610.7U CN217719665U (en) 2022-05-09 2022-05-09 Pole piece prelithiation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221093610.7U CN217719665U (en) 2022-05-09 2022-05-09 Pole piece prelithiation device

Publications (1)

Publication Number Publication Date
CN217719665U true CN217719665U (en) 2022-11-01

Family

ID=83791148

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221093610.7U Active CN217719665U (en) 2022-05-09 2022-05-09 Pole piece prelithiation device

Country Status (1)

Country Link
CN (1) CN217719665U (en)

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