CN215771248U

CN215771248U - Lithium ion pole piece prelithiation device

Info

Publication number: CN215771248U
Application number: CN202122287418.3U
Authority: CN
Inventors: 李晶; 腾进晗; 廖茂闯; 杨力齐; 杨志刚
Original assignee: Shehong Shenghong Industrial Co ltd; Sichuan Lyuxin Power Supply Technology Co ltd; Southwest University of Science and Technology
Current assignee: Shehong Shenghong Industrial Co ltd; Sichuan Lyuxin Power Supply Technology Co ltd; Southwest University of Science and Technology
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-02-08
Anticipated expiration: 2031-09-22

Abstract

The utility model discloses a lithium ion pole piece prelithiation device, which comprises an unreeling device, a reeling device, a slurry storage bin, a slurry spraying assembly and a pole lug shielding part, wherein the unreeling device is arranged on the pole lug; the pole pieces are arranged on a transmission belt between the unwinding device and the winding device, the slurry storage bin is positioned on one side of the unwinding device, and the slurry spraying assembly is positioned on one side of the transmission belt between the unwinding device and the winding device; the slurry spraying assembly is used for spraying the slurry in the slurry storage bin onto a pole lug, and the pole lug shielding part is arranged on a transmission belt between the unreeling device and the reeling device; the lug shielding part is used for shielding the lugs of the pole pieces; the method has the effect of improving the prelithiation quality of the pole piece to a certain extent.

Description

Lithium ion pole piece prelithiation device

Technical Field

The utility model relates to a prelithiation device, in particular to a prelithiation device for a lithium ion pole piece, and belongs to the field of lithium ion batteries.

Background

As an important power supply source, lithium ion batteries are widely used in the fields of digital code, communication, traffic, etc. due to their characteristics of high energy density, high rated voltage, long service life, etc. In the first charge and discharge process of the lithium ion battery, a negative electrode material and electrolyte react on a solid-liquid phase interface to form a passivation film covering the surface of the negative electrode material, and the passivation film is called a Solid Electrolyte Interface (SEI) film. The SEI film can effectively avoid damage to the negative electrode material caused by the co-insertion of solvent molecules, thereby prolonging the service life of the electrode. But the SEI film consumes a part of lithium ions during the formation process and this reaction is irreversible, thereby decreasing the capacity of the battery, resulting in a decrease in the first efficiency of the battery. Therefore, researchers are exploring and proposing different solutions, and the prelithiation technology is an effective means for solving the problem of the first efficiency reduction of the lithium ion battery.

The prelithiation technology comprises a negative electrode advanced formation method and a negative electrode lithium powder spraying method; the advanced formation method of the negative electrode is to soak the negative electrode sheet and the lithium sheet in electrolyte and to charge the negative electrode sheet and the lithium sheet through an external circuit connection. Therefore, lithium ions consumed in formation can be ensured to come from the metal lithium sheet instead of the positive electrode; after the formation of the negative electrode plate is finished, the negative electrode plate is assembled with the positive electrode plate, and the formation of the battery cell is not needed, so that the lithium ions of the positive electrode cannot be lost due to the formation of an SEI (solid electrolyte interphase) film by the negative electrode, and the capacity can be obviously improved; because the lithium supplement is difficult to operate by singly forming the negative pole piece, people think of the lithium supplement method of directly spraying the lithium powder on the negative pole piece; firstly, preparing stable metal lithium powder particles, wherein the inner layer of the particles is metal lithium, and the outer layer of the particles is a protective layer with good lithium ion conductivity and electron conductivity; in the pre-lithiation process, firstly dispersing lithium powder in an organic solvent, then spraying the dispersion on a negative plate, and then drying the residual organic solvent on the negative plate, so as to obtain the negative plate subjected to pre-lithiation; during formation, the lithium powder sprayed on the negative electrode is consumed in the formation of an SEI film, so that lithium ions deintercalated from the positive electrode are retained to the maximum extent, and the capacity of the full cell is improved.

In view of the above-mentioned related technologies, the applicant believes that the method of spraying lithium powder on the negative electrode is simpler in operation difficulty than the method of forming the negative electrode in advance, but because the negative electrode plate has various shapes, the negative electrode plate usually includes a tab, and the lithium powder is easily sprayed on the tab in the process of spraying lithium powder, thereby affecting the quality of prelithiation of the electrode plate.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present invention aims to provide a prelithiation device for a lithium ion electrode plate

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a lithium ion pole piece prelithiation device comprises an unreeling device, a reeling device, a slurry storage bin, a slurry spraying assembly and a pole lug shielding part; the pole pieces are arranged on a transmission belt between the unwinding device and the winding device, the slurry storage bin is positioned on one side of the unwinding device, and the slurry spraying assembly is positioned on one side of the transmission belt between the unwinding device and the winding device; the lug shielding part is arranged on a transmission belt between the unreeling device and the reeling device; the lug shielding part is used for shielding the lugs of the pole pieces;

the slurry spraying assembly comprises a slurry pump, a slurry pipe, a material distributing pipe and a slurry nozzle; the feeding end of the slurry pump is communicated with the inside of the slurry storage bin, one end of the slurry pipe is communicated with the discharging end of the slurry pump, the other end of the slurry pipe is communicated with the material distributing pipe, the length direction of the material distributing pipe is consistent with the transmission direction of a pole piece, the slurry nozzles are communicated and arranged on the material distributing pipe, the direction of spraying the slurry by the slurry nozzles is perpendicular to the length direction of the material distributing pipe, and the discharging ends of the slurry nozzles face the pole piece.

Preferably, the working surfaces of the unreeling device and the transmission belt of the reeling device are vertically arranged.

Preferably, the transmission belt between the unwinding device and the winding device is horizontally and symmetrically provided with the slurry spraying assembly and the slurry storage bin along two sides of the pole piece transmission direction.

Preferably, the transmission band between unwinding device and the coiling mechanism is provided with along pole piece direction of transmission's both sides face the symmetry the utmost point ear shielding part, two utmost point ear shielding part carries out the centre gripping to the utmost point ear of pole piece and shelters from, and the transmission band between unwinding device and the coiling mechanism is kept away from at the position of treating the spraying of pole piece, and is two sets of thick liquids spraying assembly can carry out the spraying thick liquids to the both sides face of same pole piece.

Preferably, the tab shielding part is located at the edge of the transmission belt between the unwinding device and the winding device.

Preferably, a waste slurry recycling bin is arranged under the slurry spraying assembly, the waste slurry recycling bin is located below a transmission belt between the unreeling device and the reeling device, and an upper end opening of the waste slurry recycling bin is arranged.

Preferably, one side of the slurry spraying assembly is provided with a blast dryer, and a transmission belt of the winding device penetrates through the blast dryer.

The utility model has the beneficial effects that:

1. the slurry pump is started, slurry in the slurry storage bin is pumped into the material separating pipe through the slurry pipe by the slurry pump, and the slurry in the material separating pipe is sprayed to the surface of the pole piece on the transmission belt between the unwinding device and the winding device through the slurry nozzle;

2. the pole lug shielding parts are located at the edge positions of the transmission belt between the unwinding device and the winding device, the transmission belt between the unwinding device and the winding device is symmetrically provided with the pole lug shielding parts along the two sides of the pole piece transmission direction, the pole lugs of the pole pieces are clamped and shielded by the two pole lug shielding parts, slurry nozzles on the two sides of the pole pieces are convenient to spray slurry on the two side faces of the same pole piece, and the speed of pre-lithiation of the pole pieces is increased to a certain extent.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is an enlarged view of part A of FIG. 1 in example 1 of the present invention;

in the figure: 1. an unwinding device; 2. a winding device; 3. a slurry storage bin; 4. a slurry spray assembly; 41. a slurry pump; 42. a slurry pipe; 43. distributing pipes; 44. a slurry nozzle; 5. a tab shielding part; 6. a waste slurry recovery bin; 7. a forced air drier.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1

A lithium ion pole piece prelithiation device, referring to fig. 1, comprises an unreeling device 1, a reeling device 2, a slurry storage bin 3, a slurry spraying assembly 4 and a pole lug shielding part 5; one or more pole pieces can be pasted on a transmission belt between the unwinding device 1 and the winding device 2, a pole lug shielding part 5 is arranged on the transmission belt between the unwinding device 1 and the winding device 2, the pole lug shielding part 5 is a shielding belt, the shielding belt is in a long strip shape, the shielding belt can be made of plastic materials or metal materials, two ends of the shielding belt are tightly pasted or connected on the transmission belt of the unwinding device 1 through screws, the length direction of the pole lug shielding part 5 is consistent with the transmission direction of the pole pieces, the pole lug shielding part 5 shields the pole lugs of one or more pole pieces, a slurry storage bin 3 is positioned on the ground on one side of the unwinding device 1, and a slurry spraying assembly 4 is positioned on one side of the transmission belt between the unwinding device 1 and the winding device 2; the slurry spraying assembly 4 is used for spraying the slurry in the slurry storage bin 3 onto the pole pieces; the slurry spraying assembly 4 comprises a slurry pump 41, a slurry pipe 42, a material distributing pipe 43 and a slurry nozzle 44; the feeding end of the slurry pump 41 is communicated with the inside of the slurry storage bin 3, one end of the slurry pipe 42 is communicated with the discharging end of the slurry pump 41, the other end of the slurry pipe is communicated with the material distribution pipe 43, the length direction of the material distribution pipe 43 is consistent with the transmission direction of the pole pieces, the plurality of slurry nozzles 44 are communicated and arranged on the material distribution pipe 43, the direction of spraying the slurry by the plurality of slurry nozzles 44 is vertical to the length direction of the material distribution pipe 43, and the discharging end of each slurry nozzle 44 faces one side surface of the corresponding pole piece; starting the slurry pump 41, pumping the slurry inside the slurry storage bin 3 out by the slurry pump 41 and pumping the slurry into the slurry pipe 42, enabling the slurry inside the slurry pipe 42 to enter the material separating pipe 43, and spraying the slurry on the surface of the pole piece by the slurry in the material separating pipe 43 through the slurry nozzle 44; the lug shielding part 5 reduces the condition that the slurry is sprayed on the lug of the pole piece, and improves the pre-lithiation quality of the pole piece to a certain extent.

Referring to fig. 1, working faces of transmission belts of an unwinding device 1 and a winding device 2 are vertically arranged, two side faces of the transmission belt between the unwinding device 1 and the winding device 2 along a pole piece transmission direction are symmetrically provided with slurry spraying assemblies 4 and slurry storage bins 3, distances from the two groups of slurry spraying assemblies 4 to the ground are the same, the two slurry storage bins 3 are both located on the ground, and in combination with fig. 2, two side faces of the transmission belt between the unwinding device 1 and the winding device 2 along the pole piece transmission direction are symmetrically provided with pole lug shielding parts 5, so that pole lugs of a pole piece can be placed into a gap between the two pole lug shielding parts 5, and the pole piece can be clamped and the pole lugs of the pole piece can be shielded; utmost point ear shielding part 5 is located the border position of the transmission band between unwinding device 1 and the coiling mechanism 2, utmost point ear shielding part 5 is located the last border department of the transmission band between unwinding device 1 and the coiling mechanism 2 promptly, the utmost point ear of pole piece is located between two utmost point ear shielding part 5, the transmission band between unwinding device 1 and the coiling mechanism 2 is kept away from at the position of treating the spraying of pole piece, make things convenient for the thick liquids spraying component 4 of the transmission band both sides between unwinding device 1 and the coiling mechanism 2 to carry out the spraying thick liquids to the both sides face of same pole piece, be favorable to improving the efficiency of carrying out the spraying thick liquids to the pole piece.

Referring to fig. 1, a waste slurry recovery bin 6 is arranged right below a slurry spraying assembly 4, the waste slurry recovery bin 6 is located below a transmission belt between an unreeling device 1 and a reeling device 2, and an upper end opening of the waste slurry recovery bin 6 is arranged to conveniently receive slurry falling in a slurry spraying process, so that the falling slurry can be conveniently recycled; one side that thick liquids spray assembly 4 is close to coiling mechanism 2 is provided with air-blast drier 7, and air-blast drier 7 is passed to coiling mechanism 2's transmission band, and spray assembly accomplishes the spraying back of thick liquids to the pole piece, and the pole piece is transmitted to air-blast drier 7 inside and is dried.

Example 2

The difference between this embodiment and embodiment 1 is that the spraying components on both sides of the conveying belt between the unwinding device 1 and the winding device 2 share one slurry storage bin 3 and one slurry pump 41, that is, two slurry pipes 42 are communicated, so that the use of the slurry pump 41 is reduced.

Example 3

The difference between this embodiment and embodiment 1 is that the tab shielding portion 5 is located at the lower edge of the transmission belt between the unwinding device 1 and the winding device 2.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A lithium ion pole piece prelithiation device which characterized in that: the device comprises an unreeling device (1), a reeling device (2), a slurry storage bin (3), a slurry spraying assembly (4) and a tab shielding part (5); the pole pieces are arranged on a transmission belt between the unwinding device (1) and the winding device (2), the slurry storage bin (3) is positioned on one side of the unwinding device (1), and the slurry spraying assembly (4) is positioned on one side of the transmission belt between the unwinding device (1) and the winding device (2); the lug shielding part (5) is arranged on a transmission belt between the unreeling device (1) and the reeling device (2); the lug shielding part (5) is used for shielding the lugs of the pole pieces;

the slurry spraying assembly (4) comprises a slurry pump (41), a slurry pipe (42), a material distributing pipe (43) and a slurry nozzle (44); the feeding end of the slurry pump (41) is communicated with the inside of the slurry storage bin (3), one end of the slurry pipe (42) is communicated with the discharging end of the slurry pump (41), the other end of the slurry pipe is communicated with the material distribution pipe (43), the length direction of the material distribution pipe (43) is consistent with the transmission direction of the pole piece, the slurry nozzles (44) are communicated and arranged on the material distribution pipe (43), the direction of spraying the slurry by the slurry nozzles (44) is perpendicular to the length direction of the material distribution pipe (43), and the discharging end of the slurry nozzles (44) faces the pole piece.

2. The pre-lithiation device of the lithium ion pole piece of claim 1, wherein: the working surfaces of the transmission belts of the unreeling device (1) and the reeling device (2) are vertically arranged.

3. The pre-lithiation device of the lithium ion pole piece of claim 2, wherein: the transmission belt between the unwinding device (1) and the winding device (2) is horizontally and symmetrically arranged on two sides of the pole piece transmission direction, and the slurry spraying assembly (4) and the slurry storage bin (3) are arranged on the transmission belt.

4. The pre-lithiation device of the lithium ion pole piece according to claim 3, wherein: the transmission band between unwinding device (1) and coiling mechanism (2) is provided with along pole piece direction of transmission's both sides face the symmetry utmost point ear shielding part (5), two utmost point ear shielding part (5) carry out the centre gripping to the utmost point ear of pole piece and shelter from, and the pole piece treat the spraying position and keep away from the transmission band between unwinding device (1) and coiling mechanism (2), two sets of thick liquids spraying assembly (4) can carry out the spraying thick liquids to the both sides face of same pole piece.

5. The pre-lithiation device of the lithium ion pole piece of claim 1, wherein: and the lug shielding part (5) is positioned at the edge position of the transmission belt between the unreeling device (1) and the reeling device (2).

6. The pre-lithiation device of the lithium ion pole piece of claim 1, wherein: be provided with waste material thick liquids and retrieve storehouse (6) under thick liquids spraying component (4), just waste material thick liquids are retrieved storehouse (6) and are located the below of the transmission band between unwinding device (1) and coiling mechanism (2), the upper end opening setting in waste material thick liquids recovery storehouse (6).

7. The pre-lithiation device of the lithium ion pole piece of claim 1, wherein: and a blowing dryer (7) is arranged on one side of the slurry spraying assembly (4), and a transmission belt of the winding device (2) penetrates through the blowing dryer (7).