CN213223755U

CN213223755U - Multistage calendering device of ultra-thin lithium area

Info

Publication number: CN213223755U
Application number: CN202022080700.XU
Authority: CN
Inventors: 周复; 杨洋; 邹崴; 刘强
Original assignee: Tianqi Lithium Corp; Chongqing Tianqi Lithium Co ltd
Current assignee: Tianqi Lithium Corp; Chongqing Tianqi Lithium Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-05-18
Anticipated expiration: 2030-09-21

Abstract

The utility model discloses multistage calendering device in ultra-thin lithium area belongs to the rolling field in lithium area, and the purpose is to realize once rolling multistage calendering to the lithium area, reduces the disconnected risk of taking. The lithium strip lithium battery; each set of rolling device comprises two rotating rollers which roll oppositely; a roll gap is arranged between the two oppositely rolled rotating rolls of each set of rolling device; and the roll gaps of the rolling devices are sequentially reduced along the lithium belt transmission direction. The utility model, through arranging a plurality of sets of rolling devices, carries out multi-stage rolling on the lithium strip for a plurality of times, reduces the rolling times and reduces the strip breakage risk; the deviation risk of the lithium belt is reduced, and the investment of a deviation correcting device is reduced; along the lithium strip transmission direction, the roll gap of each set of rolling device is reduced in sequence, so that multi-stage rolling is realized while rolling for multiple times in one time, the purpose of achieving the required thickness in one time can be realized, and the time and the cost are saved.

Description

Multistage calendering device of ultra-thin lithium area

Technical Field

The utility model relates to a rolling device in lithium area, specific is multistage calendering device in ultra-thin lithium area.

Background

Lithium metal is an important negative electrode material for primary and secondary batteries. The theoretical capacity of the metallic lithium is 3860mAh/g, while the theoretical capacity of the traditional graphite negative electrode is 372mAh/g, and the metallic lithium becomes a Saint cup of a battery energy storage junction by being ten times of the theoretical capacity and the most negative potential (the electrochemical potential of the metallic lithium is-3.045V).

The ultra-thin lithium strip with the thickness of less than 20 microns can greatly improve the energy density of the battery by using the ultra-thin metal lithium strip, but in view of the characteristics that the metal lithium material is soft in texture and easy to adhere, and the edge cracking phenomenon can be caused by too large rolling deformation amount at one time, the existing ultra-thin lithium strip, composite lithium strip and the like need to be subjected to multi-stage rolling, the process can be repeatedly wound and unwound, the strip breaking risk is greatly increased, the time is consumed, and the labor cost is increased. For example, CN201920341275X, entitled ultra-thin lithium foil and apparatus for preparing ultra-thin lithium foil, discloses a rolling mill for rolling lithium strips, which uses a pair of rollers rolled oppositely to produce a lithium foil with a desired thickness by multiple rolling.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving traditional ultra-thin lithium area and need receive repeatedly to unreel and carry out calendering many times, the problem that the risk is high is taken absolutely provides the multistage calendering device in ultra-thin lithium area, realizes once rolling multistage calendering, reduces and takes the risk absolutely.

The utility model adopts the technical proposal that: the multistage calendering device for the ultrathin lithium strip comprises a rolling mill, wherein the rolling mill comprises at least three sets of rolling devices arranged along the transmission direction of the lithium strip; each set of rolling device comprises two rotating rollers which roll oppositely; a roll gap is arranged between the two oppositely rolled rotating rolls of each set of rolling device; and the roll gaps of the rolling devices are sequentially reduced along the lithium belt transmission direction.

Furthermore, all sets of rolling devices are arranged along a straight line, and the distance between every two adjacent sets of rolling devices is equal.

Furthermore, all sets of rolling devices are arranged along the annular direction, and the distance between every two adjacent sets of rolling devices is equal.

Furthermore, the rolling mill comprises a main roller and peripheral rollers which are uniformly distributed around the main roller, and the main roller and one peripheral roller form two opposite rolling rotating rollers of a set of rolling device.

Further, the diameter of the main roller is larger than or equal to that of the peripheral rollers, and the diameters of the peripheral rollers are equal.

The utility model has the advantages that: the utility model discloses a multistage calendering device for ultra-thin lithium strips, which is provided with a plurality of sets of rolling devices to carry out a plurality of calendering on the lithium strips, thereby reducing the rolling times and reducing the strip breakage risk; the rear rolling device has the function of pushing the lithium belt to the front rolling device along the lithium belt transmission direction, and the rear rolling device can play a positioning role when the front rolling device is used for rolling the lithium belt, so that the deviation risk of the lithium belt is reduced, and the investment of a deviation correcting device is reduced; along the lithium strip transmission direction, the roll gap of each set of rolling device is reduced in sequence, so that multi-stage rolling is realized while rolling for multiple times in one time, the purpose of achieving the required thickness in one time can be realized, and the time and the cost are saved.

Drawings

FIG. 1 is a schematic structural view of example 1;

fig. 2 is a schematic structural diagram of embodiment 2.

In the figure, the rolling device 1, the turning roll 11, the roll gap 12, the main roll 13, the peripheral roll 14, the left roll 141, the right roll 142, the upper roll 143, and the lower roll 144.

Detailed Description

The invention is further described below with reference to the following figures and examples:

the multistage calendering device for the ultrathin lithium strip comprises a rolling mill, wherein the rolling mill comprises at least three sets of rolling devices 1 arranged along the transmission direction of the lithium strip; each set of rolling device 1 comprises two rotating rollers 11 which roll oppositely; and a roll gap 12 is arranged between two oppositely rolled rotating rolls 11 of each set of rolling device 1; the roll gaps 12 of the rolling devices 1 are sequentially reduced along the lithium strip transmission direction.

The utility model discloses a multistage calendering device for ultra-thin lithium strips, which is provided with a plurality of sets of rolling devices 1 to carry out a plurality of calendering on the lithium strips, thereby reducing the rolling times and reducing the strip breakage risk; the rebound of the belt material is reduced, the glossiness is good, and the thickness consistency is high; the rear rolling device 1 has the function of pushing the lithium belt to the front rolling device 1 along the lithium belt transmission direction, and when the front rolling device 1 is used for rolling the lithium belt, the rear rolling device 1 can play a positioning role, so that the deviation risk of the lithium belt is reduced, and the investment of a deviation correcting device is reduced; along the lithium strip transmission direction, the roll gap 12 of each set of rolling device 1 is sequentially reduced, so that multi-stage rolling is realized while rolling for multiple times in one time, the purpose of achieving the required thickness in one time can be realized, and the time and the cost are saved.

As shown in fig. 1, each set of rolling devices 1 is arranged along a straight line, and the distance between two adjacent sets of rolling devices 1 is equal. The sets of rolling devices 1 are arranged along a straight line, i.e. the central line of the roll gap 12 of each set of rolling devices 1 coincides with the same straight line. The structure has simple installation of the rotating rollers 11 of each set of rolling device 1.

In order to save the floor space and reasonably utilize the space, in the embodiment shown in fig. 2, preferably, the sets of rolling devices 1 are arranged in a circular direction, and the distance between two adjacent sets of rolling devices 1 is equal.

In order to reduce the number of the rotating rolls 11 as much as possible for the same rolling number, thereby saving the cost. Preferably, the rolling mill comprises a main roller 13 and peripheral rollers 14 uniformly distributed around the main roller 13, and the main roller 13 and one peripheral roller 14 form a set of two oppositely rolled rotating rollers 11 of the rolling device 1.

When the number of rolling times is N, N is greater than or equal to 3, and when the rolling devices 1 are linearly arranged, the number of the required rotating rollers 11 is 2N. In the structure, all the roller devices 1 share one main roller 13, so the number of the required rotating rollers 11 is N +1, the number of the rotating rollers 11 is reduced, the cost is saved, and meanwhile, the occupied area and the occupied space are further reduced. In addition, according to the structure, the lithium strip is attached to the main roller 13, and the traveling distance is shortened, so that the deviation probability is reduced, and the deviation risk of the lithium strip is reduced.

To facilitate installation, the diameter of the main roll 13 is greater than or equal to the diameter of the peripheral rolls 14, and the diameters of the peripheral rolls 14 are equal.

Wherein the roll diameter of the main roll 13 is usually 10 to 30 cm.

A 180 μm thick lithium ribbon was rolled using a multi-stage rolling apparatus shown in fig. 2:

as shown in fig. 2, 4 peripheral rolls 14, a left roll 141, a right roll 142, an upper roll 143, and a lower roll 144 are arranged around the main roll 13; the roll gap between the left roll 141 and the main roll 13 is 100 μm; the roll gap between the lower roll 144 and the main roll 13 is 70 μm; the roll gap between the right roll 142 and the main roll 13 is 40 μm; the nip between the upper roll 143 and the main roll 13 was 20 μm.

The front end of the lithium strip with the thickness of 180 mu m enters the roll gap between the left roll 141 and the main roll 13 from the side of the left roll 141 adjacent to the upper roll 143 for rolling, and the thickness of the lithium strip is 100 mu m after the roll gap between the left roll 141 and the main roll 13 is rolled; then the lithium strip enters a roll gap between a lower roll 144 and a main roll 13 for rolling, and the thickness of the rolled lithium strip is 70 mu m; then, the lithium strip enters a roll gap between the right roll 142 and the main roll 13 for rolling, and the thickness of the rolled lithium strip is 40 microns; and then the lithium strip enters a roll gap between the upper roll 143 and the main roll 13 to be rolled, the rolled lithium strip is led out from one side of the upper roll 143 adjacent to the left roll 141, and the thickness of the rolled lithium strip is 20 microns.

Claims

1. Multistage calendering device of ultra-thin lithium area, including the rolling mill, its characterized in that: the rolling mill comprises at least three sets of rolling devices (1) arranged along the lithium strip transmission direction; each set of rolling device (1) comprises two rotating rollers (11) which roll oppositely; a roll gap (12) is arranged between two oppositely rolled rotating rolls (11) of each set of rolling device (1); along the lithium belt transmission direction, the roll gaps (12) of all the sets of rolling devices (1) are sequentially reduced.

2. The multi-stage calendaring apparatus for ultra-thin lithium ribbons of claim 1, wherein: all sets of rolling devices (1) are arranged along a straight line, and the distance between every two adjacent sets of rolling devices (1) is equal.

3. The multi-stage calendaring apparatus for ultra-thin lithium ribbons of claim 1, wherein: the rolling devices (1) are arranged along the annular direction, and the distance between every two adjacent rolling devices (1) is equal.

4. The multi-stage calendaring apparatus for ultra-thin lithium ribbons of claim 3, wherein: the rolling mill comprises a main roller (13) and peripheral rollers (14) which are uniformly distributed around the main roller (13), and the main roller (13) and one peripheral roller (14) form two opposite rolling rotating rollers (11) of the rolling device (1).

5. The multi-stage calendaring apparatus for ultra-thin lithium ribbons of claim 4, wherein: the diameter of the main roller (13) is larger than or equal to that of the peripheral rollers (14), and the diameters of the peripheral rollers (14) are equal.