CN-117000794-B - Strip deoiling device and lithium strip rolling system for lithium battery

CN117000794BCN 117000794 BCN117000794 BCN 117000794BCN-117000794-B

Abstract

The invention provides a strip oil removal device capable of removing oil from a strip in a rolling process and a lithium strip rolling system for a lithium battery. The invention provides a strip oil removing device which comprises a conveying roller, a wiping piece and a liquid supply assembly, wherein the conveying roller is used for conveying a strip to be wiped, the wiping piece is arranged opposite to the conveying roller, the strip to be wiped passes through the gap between the wiping piece and the conveying roller, the wiping piece is made of a liquid-permeable material, and the liquid supply assembly is connected with the wiping piece and supplies oil removing liquid to the wiping piece. The strip oil removing device and the lithium strip rolling system for the lithium battery can avoid slipping when rolling the metal material after removing the oil film on the back surface of the strip protective film, so that a large number of defective products are avoided, waste of manpower, material resources and time is avoided, and the rolling production qualification rate of the metal material is ensured.

Inventors

JIAO JUNFENG
CAI CHUNLIANG
LI ZHANPENG

Assignees

广东捷盟智能装备有限公司

Dates

Publication Date: 20260508
Application Date: 20230803

Claims (7)

1. The lithium belt rolling system for the lithium battery is characterized by comprising a first belt conveying system, a second belt conveying system and a roller, wherein the first belt conveying system and the second belt conveying system are respectively used for conveying a first belt and a second belt to the roller, the roller is used for pressing the first belt and the second belt, and a belt degreasing device is arranged on the first belt conveying system and/or the second belt conveying system and is used for degreasing the first belt and/or the second belt; The strip oil removing device comprises a conveying roller, a wiping piece and a liquid supply assembly, wherein the conveying roller is used for conveying a strip to be wiped, the wiping piece is arranged opposite to the conveying roller, the strip to be wiped passes through the gap between the wiping piece and the conveying roller, the wiping piece is made of a liquid-permeable material, and the liquid supply assembly is connected with the wiping piece and is used for supplying oil removing liquid to the wiping piece; The liquid supply assembly comprises a solution box and a liquid supply driving piece, wherein the solution box is used for storing oil removal liquid, the wiping piece is coated on the outer side of the solution box, a permeation channel for the oil removal liquid to permeate into the wiping piece is arranged on the solution box, and the liquid supply driving piece is connected with the solution box and used for applying pressure to the solution box and the wiping piece towards the conveying roller; The liquid supply assembly further comprises a solution supply pump, a flow divider and a plurality of distributing pipes, one ends of the distributing pipes are connected with the flow divider, the other ends of the distributing pipes are connected with the solution box and distributed at intervals, the flow divider is connected with the solution supply pump, and the solution supply pump supplies oil removal liquid to the solution box through the flow divider and the distributing pipes.
2. The lithium strip rolling system of claim 1, wherein the strip degreasing device further comprises a winding assembly and an unwinding assembly, the wiper member being made of a strip-shaped flexible material and being connected to the winding assembly and the unwinding assembly, the winding assembly and the unwinding assembly being configured to move the wiper member.
3. The lithium strip rolling system of claim 2, wherein the strip degreasing device further comprises a fixed bracket, the winding assembly comprises a winding shaft and a winding driving device, the unwinding assembly comprises a unwinding shaft and a unwinding driving device, the winding shaft, the unwinding shaft and the conveying roller are all installed in the fixed bracket, the winding shaft, the unwinding shaft and the conveying roller are axially parallel and are in triangular layout on a plane perpendicular to the axial direction, and two ends of the wiping piece are respectively wound on the winding shaft and the unwinding shaft.
4. The lithium strip rolling system of claim 1, the strip degreasing device further comprises an oil mist absorbing cover for absorbing degreasing liquid volatiles released by the wiper and/or the solution cartridge, and a sealing cover sealed at the outer side of the solution feed pump and connected with the oil mist absorbing cover through a pipe, the sealing cover being for allowing degreasing liquid volatiles generated by the solution feed pump to enter the oil mist absorbing cover through a pipe, the liquid feed assembly further comprising a liquid storage cotton disposed in the solution cartridge.
5. The lithium strip rolling system of claim 1, wherein the strip degreasing device further comprises a strip transfer assembly including a plurality of transfer rollers and a tension detector for detecting tension of the strip transferred by the transfer rollers, and a controller electrically connected to the tension detector and the liquid supply driving member for controlling pressure applied to the solution cartridge by the liquid supply driving member according to the tension detected by the tension detector.
6. The lithium strip rolling system of claim 1, wherein the strip degreasing device further comprises a winding assembly and an unwinding assembly, the wiper is made of a strip-shaped flexible material and is connected with the winding assembly and the unwinding assembly, the winding assembly and the unwinding assembly are used for driving the wiper to move, the strip degreasing device further comprises a fixed support, the winding assembly comprises a winding shaft and a winding driving device, the unwinding assembly comprises a unwinding shaft and an unwinding driving device, the winding shaft, the unwinding shaft, the wiper and the conveying roller are all installed in the fixed support, the winding shaft, the unwinding shaft and the conveying roller are axially parallel and are in a triangular layout on a plane perpendicular to the axial direction, two ends of the wiper are respectively wound on the winding shaft and the unwinding shaft, the solution box is arranged between the winding shaft, the unwinding shaft and the conveying roller, and the winding driving device and the unwinding driving device are driven automatically or manually at fixed time.
7. The lithium strip rolling system according to claim 1, wherein the input side and/or the output side of the transfer rolls are provided with static eliminators.

Description

Strip deoiling device and lithium strip rolling system for lithium battery Technical Field The invention relates to the field of material oil removal devices, in particular to a strip oil removal device and a lithium strip rolling system for a lithium battery. Background Lithium metal batteries are considered as the most potential power battery system due to the remarkable advantages of high specific energy and high specific power, and along with the development of technology, particularly the popularization of wearable electronic equipment and the rapid development of new energy automobiles, the batteries are required to be thinner and thinner, and meanwhile, the energy density of the batteries is required to be higher. The lithium metal anode material has extremely high theoretical capacity (3800 mAh/g) and is an ideal choice for improving the energy density of the battery. However, the lithium strips currently sold in the market for lithium batteries are generally thicker, the thickness is more than 150 mu m, and the main reasons are that lithium metal is soft, high in ductility and low in specific strength, so that the thickness is not uniform enough, and the thickness tolerance is large, so that the performance and the energy density of the lithium battery are directly influenced. Therefore, with the increasing demand for energy density of lithium metal batteries, it is important how to achieve ultra-thin lithium strips and uniform thickness. For example, in the production of solid-state lithium batteries, it is necessary to cover both sides of a copper film with lithium as a material for producing solid-state lithium batteries, and it is more necessary that lithium have ultra-thin characteristics. The lithium band can be prepared in Tianjin by adopting a vacuum extrusion molding method, so that the dimensional control precision of the preparation process is improved. However, the mold has the problems of large reaction loss, difficult control of thickness under ultrathin requirements and the like. Therefore, the ultrathin lithium strip with the thickness less than or equal to 50um is difficult to prepare by an extrusion molding method in the prior art, and is realized by a rolling mode. In the process of rolling the lithium belt into a thin material, the PET protective films with oil coated on the surfaces are required to be led in from both sides, meanwhile, the surfaces of the rolling rollers are finely ground, so that the finish machining effect close to a mirror surface is achieved, a certain oil film is formed when the back surface of the oil coated PET protective film is used for feeding materials, the oil film is contacted with a smooth roller, the slipping phenomenon is easy to occur, and the rolling quality of the lithium belt is seriously affected. Disclosure of Invention Accordingly, there is a need for a strip degreasing device and a lithium strip rolling system for lithium batteries that can degrease a strip during rolling. In order to solve the technical problems, the invention provides a strip oil removing device, which comprises a conveying roller, a wiping piece and a liquid supply assembly, wherein the conveying roller is used for conveying a strip to be wiped, the wiping piece is arranged opposite to the conveying roller, the strip to be wiped passes through between the wiping piece and the conveying roller, the wiping piece is made of a liquid-permeable material, and the liquid supply assembly is connected with the wiping piece and is used for supplying oil removing liquid to the wiping piece. Preferably, the strip oil removing device further comprises a winding assembly and an unwinding assembly, wherein the wiping piece is made of a strip-shaped flexible material and is connected with the winding assembly and the unwinding assembly, and the winding assembly and the unwinding assembly are used for driving the wiping piece to move. Preferably, the strip deoiling device further comprises a fixed support, the winding assembly comprises a winding shaft and a winding driving device, the unwinding assembly comprises an unwinding shaft and an unwinding driving device, the winding shaft, the unwinding shaft and the conveying roller are all installed in the fixed support, the winding shaft, the unwinding shaft and the conveying roller are axially parallel and are in triangular layout on a plane perpendicular to the axial direction, and two ends of the wiping piece are respectively wound on the winding shaft and the unwinding shaft. Preferably, the liquid supply assembly comprises a solution box and a liquid supply driving member, the solution box is used for storing oil removal liquid, the wiping member is wrapped on the outer side of the solution box, a permeation channel for the oil removal liquid to permeate into the wiping member is arranged on the solution box, and the liquid supply driving member is connected with the solution box and is used for applying pressure to the solution box