CN110048165B - Lithium battery cathode shell-mounting method - Google Patents
Lithium battery cathode shell-mounting method Download PDFInfo
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- CN110048165B CN110048165B CN201910161284.5A CN201910161284A CN110048165B CN 110048165 B CN110048165 B CN 110048165B CN 201910161284 A CN201910161284 A CN 201910161284A CN 110048165 B CN110048165 B CN 110048165B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
A method for encasing a negative electrode of a lithium battery includes the following steps: unreeling the lithium belt, and cutting the lithium belt to obtain a lithium sheet; winding a lithium sheet outside the shaping column to obtain a lithium sheet cylinder; the side wall of the lithium sheet cylinder is attached to and pressed outside the shaping column so as to carry out shaping operation on the lithium sheet cylinder; inserting the shaping column and the lithium sheet cylinder into the shell together; controlling the shaping column and the inner wall of the shell to perform thin pressing operation on the side wall of the lithium sheet cylinder together so as to thin the side wall of the lithium sheet cylinder and increase the diameter of the lithium sheet cylinder, and bonding the side wall of the lithium sheet cylinder with the inner wall of the shell so as to load the lithium sheet cylinder serving as the negative electrode of the lithium battery into the shell; and drawing the shaping column out of the lithium sheet cylinder. According to the lithium battery cathode shell filling method, operations such as slicing, tube forming, shell filling, thin-pressing shaping and the like are performed on the lithium belt serving as the lithium battery cathode, so that the lithium sheet tube serving as the cathode can be tightly attached to the inner wall of the battery shell, and the stability of the whole structure of the lithium battery can be effectively improved.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium battery cathode shell mounting method.
Background
Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. In lithium batteries, the chemical properties of lithium metal are very active, so that the environmental requirements for processing, storage and use of lithium metal are very high. With the development of science and technology, lithium batteries have become the mainstream nowadays.
In the production and manufacturing process of the lithium battery, a lithium tape serving as a negative electrode needs to be cut into lithium sheets and then wound into a cylindrical shape to be placed inside a battery shell, however, the conventional lithium battery negative electrode processing method is to directly place the lithium tape cylinder into the battery shell after the lithium tape is wound into the cylindrical shape, and attach the inner wall of the battery shell and the lithium tape together, but the conventional method still has the problem that the attachment of the lithium tape and the inner wall of the battery shell is not tight enough, so that the stability of the battery structure is not high enough.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a lithium battery cathode shell filling method which can tightly attach a lithium sheet cylinder serving as a cathode to the inner wall of a battery shell so that the overall structure of the battery has stronger stability.
The purpose of the invention is realized by the following technical scheme:
a method for encasing a negative electrode of a lithium battery, comprising the steps of:
unreeling a lithium belt, and cutting the lithium belt to obtain a lithium sheet;
winding the lithium sheet outside the shaping column to obtain a lithium sheet cylinder;
pressing the side wall of the lithium sheet cylinder outside the shaping column to shape the lithium sheet cylinder;
inserting the shaping column and the lithium sheet cylinder into a shell together, and leaving a gap between the side wall of the lithium sheet cylinder and the inner wall of the shell;
controlling the shaping column and the inner wall of the shell to jointly perform thin pressing operation on the side wall of the lithium sheet cylinder so as to thin the side wall of the lithium sheet cylinder and increase the diameter of the lithium sheet cylinder, and bonding the side wall of the lithium sheet cylinder with the inner wall of the shell so as to load the lithium sheet cylinder serving as a negative electrode of a lithium battery into the shell;
withdrawing the shaped pillars from the lithium sheet canister.
In one embodiment, in the operation of controlling the shaping column and the inner wall of the shell to jointly thin-press the side wall of the lithium sheet cylinder, the method specifically comprises the following steps:
the inner wall or the outer wall of the driven rotary roller is used for propping against the outer wall of the shell;
and the shaping column presses and holds the inner wall of the shell through the side wall of the lithium sheet cylinder;
and controlling the shaping column to rotate so as to drive the lithium sheet cylinder, the shell and the driven rotary roller to rotate, and enabling the rotation axis of the shaping column, the rotation axis of the lithium sheet cylinder and the rotation axis of the shell not to coincide with each other, so that the shaping column and the inner wall of the shell jointly perform thin pressing operation on the side wall of the lithium sheet cylinder, so that the side wall of the lithium sheet cylinder becomes thin and the diameter of the lithium sheet cylinder is increased until the rotation axis of the lithium sheet cylinder and the rotation axis of the shell coincide with each other, and the side wall of the lithium sheet cylinder is bonded with the inner wall of the shell.
In one embodiment, the driven roller is also controlled to rotate, and the rotating direction of the driven roller is opposite to the rotating direction of the shaping column.
In one embodiment, the operation of extracting the shaped pillars from the lithium sheet cylinder specifically comprises the following steps:
controlling the driven roller to move towards the direction far away from the outer wall of the shell so as to reduce the pressing force of the driven roller on the outer wall of the shell;
controlling the shaping column to rotate reversely so that the shaping column is debonded from the inner wall of the lithium sheet cylinder;
and drawing the shaping column out of the lithium sheet cylinder.
In one embodiment, in the operation of controlling the shaping column and the inner wall of the shell to jointly thin-press the side wall of the lithium sheet cylinder, the method specifically comprises the following steps:
fixing the shell;
the control twines lithium piece section of thick bamboo the setting post with the central axis of casing carries out circular motion as the centre of a circle, and makes the setting post pass through lithium piece section of thick bamboo lateral wall is pressed and is held on the shells inner wall, be used for making the setting post with shells inner wall is common to carry out thin pressure operation to lithium piece section of thick bamboo lateral wall, so that the lateral wall of lithium piece section of thick bamboo becomes thin with the diameter increase of lithium piece section of thick bamboo, until the axis of rotation of lithium piece section of thick bamboo with the axis of rotation of casing coincides mutually, be used for making lithium piece section of thick bamboo lateral wall with the bonding of shells inner wall.
In one embodiment, the shaping post is also controlled to rotate itself as it performs a circular motion.
In one embodiment, the shaped post is also controlled to move gradually away from the central axis of the housing as the shaped post makes a circular motion.
In one embodiment, a pressing jig is used for shaping the lithium sheet cylinder, the pressing jig comprises a plurality of arc-shaped matching surfaces capable of moving towards the side wall of the lithium sheet cylinder, and the arc-shaped matching surfaces are pressed together with the side wall of the lithium sheet cylinder to shape the lithium sheet cylinder.
In one embodiment, in the operation of winding the lithium sheet outside the shaping column to obtain the lithium sheet cylinder, the method specifically comprises the following steps:
a lithium sheet pressing piece is used for pressing and attaching part of the lithium sheet to the shaping column and tilting opposite sides of the lithium sheet;
and adopting a tube-forming pressing piece for pressing and holding the opposite sides of the lithium sheet and contacting the opposite sides of the lithium sheet to obtain the lithium sheet tube.
In one embodiment, a semicircular groove is formed in the lithium sheet pressing piece, and the side wall of the semicircular groove is used for pressing and attaching part of the lithium sheet to the shaping column and tilting the opposite side of the lithium sheet.
Compared with the prior art, the invention has at least the following advantages:
according to the lithium battery cathode shell filling method, operations such as slicing, tube forming, shell filling, thin-pressing shaping and the like are performed on the lithium belt serving as the lithium battery cathode, so that the lithium sheet tube serving as the cathode can be tightly attached to the inner wall of the battery shell, the processing operation is simple, the stability of the whole structure of the lithium battery can be effectively improved, and the electrical performance of the lithium battery is more stable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flow chart of a method of encasing a negative electrode of a lithium battery according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the driven roller of the present invention abutting against the outer wall of the housing;
FIG. 3 is a schematic view of the structure of the driven roller of the present invention against the outer wall of the housing;
fig. 4 is a schematic structural diagram illustrating a structure of fixing the housing and controlling the shape-stabilized column wound with the lithium-containing lithium cartridge to perform circular motion around a central axis of the housing according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It is noted that as used herein, reference to an element being "connected" to another element also means that the element is "in communication" with the other element, and fluid can be in exchange communication between the two.
In one embodiment, a method for encasing a negative electrode of a lithium battery includes the steps of: unreeling a lithium belt, and cutting the lithium belt to obtain a lithium sheet; winding the lithium sheet outside the shaping column to obtain a lithium sheet cylinder; pressing the side wall of the lithium sheet cylinder outside the shaping column to shape the lithium sheet cylinder; inserting the shaping column and the lithium sheet cylinder into a shell together, and leaving a gap between the side wall of the lithium sheet cylinder and the inner wall of the shell; controlling the shaping column and the inner wall of the shell to jointly perform thin pressing operation on the side wall of the lithium sheet cylinder so as to thin the side wall of the lithium sheet cylinder and increase the diameter of the lithium sheet cylinder, and bonding the side wall of the lithium sheet cylinder with the inner wall of the shell so as to load the lithium sheet cylinder serving as a negative electrode of a lithium battery into the shell; withdrawing the shaped pillars from the lithium sheet canister. According to the lithium battery cathode shell filling method, operations such as slicing, tube forming, shell filling, thin-pressing shaping and the like are performed on the lithium belt serving as the lithium battery cathode, so that the lithium sheet tube serving as the cathode can be tightly attached to the inner wall of the battery shell, the processing operation is simple, the stability of the whole structure of the lithium battery can be effectively improved, and the electrical performance of the lithium battery is more stable.
In order to better explain the method for housing the negative electrode of the lithium battery, the concept of the method for housing the negative electrode of the lithium battery is better understood. Referring to fig. 1, a method for housing a negative electrode of a lithium battery includes the following steps:
s110, unreeling the lithium strip, and cutting the lithium strip to obtain a lithium sheet.
It should be noted that, in the operation of unreeling the lithium ribbon, the lithium ribbon is placed on the unreeling device, so that the unreeling and feeding operation can be performed on the lithium ribbon through the unreeling device; for example, the unreeling device comprises an unreeling turntable, the lithium belt is installed on the unreeling turntable, and then unreeling and feeding operation is performed on the lithium belt through rotation of the unreeling turntable. In the cutting operation of the lithium strip, the lithium strip is fed to the corresponding cutting device, so that the cutting operation of the lithium strip is performed by the cutter on the cutting device, and the lithium sheet is obtained. Of course, besides the unreeling device and the cutting device for unreeling and cutting the lithium strip, other methods for unreeling and cutting the lithium strip in the prior art may be adopted, for example, unreeling and cutting the lithium strip manually, so that a lithium sheet structure meeting the production specification can be obtained.
And S120, winding the lithium sheet outside the shaping column to obtain the lithium sheet cylinder.
It should be noted that, in the manufacturing process of the lithium battery, the battery case is a cylindrical structure, and the negative electrode sheet of the lithium battery needs to be attached to the inner wall of the battery case, so that the cut lithium sheet needs to be wound into a lithium sheet cylinder before being placed in the battery case. Through the winding of the lithium piece that will cut outside the setting post, and the setting post is the cylinder structure to can make the winding become the lithium piece section of thick bamboo of cylindric structure outside the setting post.
In one embodiment, in the operation of winding the lithium sheet outside the shaping column to obtain the lithium sheet cartridge, the method specifically comprises the following steps: a lithium sheet pressing piece is used for pressing and attaching part of the lithium sheet to the shaping column and tilting opposite sides of the lithium sheet; and adopting a tube-forming pressing piece for pressing and holding the opposite sides of the lithium sheet and contacting the opposite sides of the lithium sheet to obtain the lithium sheet tube.
Furthermore, a semicircular groove is formed in the lithium sheet pressing piece, and the side wall of the semicircular groove is used for pressing and attaching part of the lithium sheet to the shaping column and enabling the opposite side of the lithium sheet to tilt.
The lithium sheet after cutting is fixed by the lithium sheet pressing and holding piece, the lithium sheet pressing and holding piece is provided with a vacuum adsorption hole, the lithium sheet can be adsorbed and fixed on the lithium sheet pressing and holding piece in a vacuum adsorption mode, and the lithium sheet after adsorption and fixation moves towards the direction of the shaping column under the driving of the lithium sheet pressing and holding piece, so that part of the lithium sheet is pressed and attached to the shaping column, and the opposite side of the lithium sheet is tilted; in order to make the lithium piece can better laminate with the setting post in the in-process of pressing and holding, be provided with the half slot on the lithium piece pressing and holding piece, press and hold the half slot on the piece and align with the setting post through making the lithium piece to can make the lithium piece press and hold the part of lithium piece and attach through the lateral wall of half slot at the pressing and holding in-process on the setting post, and make the opposite side perk of lithium piece makes the lithium piece can better laminate with the setting post from this. And when the opposite sides of the lithium sheet are tilted, pressing the opposite sides of the lithium sheet by using a tube-forming pressing piece, and contacting the opposite sides of the lithium sheet to obtain the lithium sheet tube. Specifically, the tube-forming pressing piece can be two tube-forming pressing blocks which are symmetrically arranged, a pressing groove is formed in each tube-forming pressing block, the pressing grooves are spliced with each other to form a semicircular groove, when the opposite sides of the lithium sheet are tilted, the two tube-forming pressing blocks move close to each other, so that the opposite sides of the lithium sheet are pressed and held, the opposite sides of the lithium sheet are in contact in the pressing and holding process, and the lithium sheet tube is obtained on the shaping column.
S130, attaching the side wall of the lithium sheet cylinder outside the shaping column to shape the lithium sheet cylinder.
It should be noted that after the lithium sheet is wound around the shaping column to form the lithium sheet cylinder, the lithium sheet cylinder needs to be shaped for many times, so that the lithium sheet cylinder can be shaped into a regular cylinder. The side wall of the lithium sheet cylinder is attached and pressed outside the shaping column, so that the lithium sheet cylinder can be shaped through the shape of the shaping column, and the lithium sheet cylinder is shaped into a regular cylinder.
In one embodiment, in the step of pressing the side wall of the lithium sheet cylinder against the outside of the shaping column to shape the lithium sheet cylinder, the method specifically includes the following steps: and adopting a sticking and pressing jig to carry out shaping operation on the lithium sheet barrel, wherein the sticking and pressing jig comprises a plurality of arc-shaped matching surfaces which can move towards the side wall of the lithium sheet barrel, and sticking and pressing the side wall of the lithium sheet barrel together through the arc-shaped matching surfaces so as to carry out shaping operation on the lithium sheet barrel.
It should be noted that, after the lithium sheet is wound around the shaping column to form a lithium sheet barrel, a pressing jig is used to perform shaping operation on the lithium sheet barrel, for example, the pressing jig includes a plurality of arc-shaped fitting surfaces capable of moving toward the side wall of the lithium sheet barrel, and is driven by a driving mechanism such as an air cylinder or a link device to perform shaping movement, so that each arc-shaped fitting surface moves in a direction in which the shaping column of the lithium sheet is desired to be wound, and the side wall of the lithium sheet barrel is pressed against the side wall of the lithium sheet barrel through each arc-shaped fitting surface, so that the side wall of the lithium sheet barrel is fitted with the shaping column, and the lithium sheet barrel is integrally formed into a regular cylindrical shape. In the present embodiment, the lithium sheet cartridge is shaped into a regular cylindrical shape by performing the shaping operation three times, and thus the lithium sheet cartridge can be better attached to the inner wall of the battery case.
S140, the shaping column and the lithium sheet cylinder are jointly inserted into a shell, and a gap is reserved between the side wall of the lithium sheet cylinder and the inner wall of the shell.
It should be noted that, after the shaping operation of the lithium sheet cylinder is completed, the shaping column and the lithium sheet cylinder are inserted into the casing together, so that the lithium sheet cylinder can be installed in the battery casing, and in order to enable the lithium sheet cylinder to be installed in the battery casing more quickly and not to be deformed due to contact with the battery casing, a gap is left between the side wall of the lithium sheet cylinder and the inner wall of the casing, that is, the diameter of the lithium sheet cylinder is smaller than that of the battery casing.
In one embodiment, the shell pushing device is used for pushing the opening end of the battery shell to the direction of the lithium sheet cylinder, so that the shaping column and the lithium sheet cylinder are jointly inserted into the battery shell. The shell pushing device comprises a shell conveying rail, a pushing rod and a pushing cylinder, wherein the shell conveying rail is used for conveying the battery shell to the pushing rod, the pushing rod is arranged at the discharging end of the shell conveying rail, the pushing cylinder is connected with the pushing rod, and the pushing cylinder is used for driving the pushing rod to perform reciprocating displacement at the discharging end of the shell conveying rail, so that the battery shell is pushed to a lithium sheet barrel. For example, the shaping column is arranged on the turntable mechanism, the lithium sheet barrel on the shaping column is located at a position aligned with the material pushing rod through rotation of the turntable, at the moment, the battery shell is conveyed to a material pushing station of the material pushing rod through the shell conveying rail, the open end of the battery shell is aligned with the lithium sheet barrel, the material pushing rod is driven by the material pushing cylinder to move towards the shaping column, and therefore the battery shell is pushed to the lithium sheet barrel, the shaping column and the lithium sheet barrel are located in the battery shell, and operation of inserting the shaping column and the lithium sheet barrel into the shell is completed.
S150, controlling the shaping column and the inner wall of the shell to jointly perform thin pressing operation on the side wall of the lithium sheet cylinder so as to thin the side wall of the lithium sheet cylinder and increase the diameter of the lithium sheet cylinder, and bonding the side wall of the lithium sheet cylinder with the inner wall of the shell so as to load the lithium sheet cylinder serving as a negative electrode of the lithium battery into the shell.
It should be noted that, after the lithium sheet cylinder is inserted into the battery shell, the lithium sheet cylinder needs to be tightly attached to the inner wall of the battery shell, so that the electrical performance of the lithium battery formed by processing can be ensured to be stable, and the overall structure is more compact. Specifically, the shaping column and the inner wall of the shell are controlled to jointly perform thin pressing operation on the side wall of the lithium sheet cylinder, so that the side wall of the lithium sheet cylinder can be attached to the inner wall of the shell under the action of the pressure and the holding force of the shaping column and the shell, the lithium sheet cylinder is soft in material and can deform and become thin under the action of the pressure and the holding force, therefore, in the thin pressing operation of the lithium sheet cylinder, the side wall of the lithium sheet cylinder becomes thin and the diameter of the lithium sheet cylinder is increased, and in the process of thinning the side wall of the lithium sheet cylinder and increasing the diameter of the lithium sheet cylinder, the side wall of the lithium sheet cylinder is bonded with the inner wall of the shell, so that the lithium sheet cylinder serving as a negative electrode of a lithium battery is arranged in the shell.
In one embodiment, in the operation of controlling the shaping column and the inner wall of the casing to jointly thin-press the side wall of the lithium sheet cylinder, the method specifically comprises the following steps: the inner wall or the outer wall of the driven rotary roller is used for propping against the outer wall of the shell; and the shaping column presses and holds the inner wall of the shell through the side wall of the lithium sheet cylinder; and controlling the shaping column to rotate so as to drive the lithium sheet cylinder, the shell and the driven rotary roller to rotate, and enabling the rotation axis of the shaping column, the rotation axis of the lithium sheet cylinder and the rotation axis of the shell not to coincide with each other, so that the shaping column and the inner wall of the shell jointly perform thin pressing operation on the side wall of the lithium sheet cylinder, so that the side wall of the lithium sheet cylinder becomes thin and the diameter of the lithium sheet cylinder is increased until the rotation axis of the lithium sheet cylinder and the rotation axis of the shell coincide with each other, and the side wall of the lithium sheet cylinder is bonded with the inner wall of the shell.
The inner wall or the outer wall of the driven roller is used for propping against the outer wall of the shell; and the shaping column presses and holds the inner wall of the shell through the side wall of the lithium sheet cylinder, so that the lithium sheet cylinder can deform and become thinner under the pressing and holding action of the shaping column and the shell.
Referring to fig. 2, for example, the outer wall of the driven roller 100a abuts against the outer wall of the housing 200a, the driven roller is driven by a driving structure such as an air cylinder or a link mechanism to perform a displacement motion, so as to abut against the housing through the outer wall thereof, because a gap is left between the side wall of the lithium sheet cylinder 300a and the inner wall of the housing, when the outer wall of the driven roller abuts against the outer wall of the housing, the housing is displaced towards the direction of the central axis of the shaping column 400a, so that the shaping column presses the inner wall of the housing through the side wall of the lithium sheet cylinder, that is, the side wall of the lithium sheet cylinder is attached to the inner wall of the housing, and becomes thinner under the pressing action of the shaping column and the housing, at this time, by controlling the rotation of the shaping column, the lithium sheet cylinder, the housing and the driven roller can be driven to rotate, and the rotation axis of the shaping column, the rotation axis of the lithium sheet cylinder and the, in this way, when the lithium sheet cartridge, the case, and the driven roller rotate, the side wall of the lithium sheet cartridge can be thinned and the diameter of the lithium sheet cartridge can be increased, and when the rotational axis of the lithium sheet cartridge and the rotational axis of the case coincide with each other, the side wall of the lithium sheet cartridge is in close contact with the inner wall of the case, and the lithium sheet cartridge as the negative electrode of the lithium battery can be inserted into the case.
Referring to fig. 3, for example, the inner wall of the driven roller 100b abuts against the outer wall of the housing 200b, a containing cavity is provided in the driven roller, the housing is located in the containing cavity, the driven roller is driven by a driving structure such as an air cylinder or a link mechanism to perform a displacement motion, so that the inner wall of the driven roller abuts against the housing, since a gap is provided between the side wall of the lithium sheet cylinder 300b and the inner wall of the housing, when the inner wall of the driven roller abuts against the outer wall of the housing, the housing is displaced in the direction of the central axis of the shaping column 400b, so that the shaping column presses the inner wall of the housing through the side wall of the lithium sheet cylinder, that is, the side wall of the lithium sheet cylinder is attached to the inner wall of the housing and becomes thinner under the pressing action of the shaping column and the housing, at this time, the lithium sheet cylinder, the housing and the driven roller can be driven to rotate by controlling the rotation, and the rotation axis of the shaping column, the rotation axis of the lithium sheet cylinder and the rotation axis of the shell are not coincident with each other, so that the side wall of the lithium sheet cylinder can be thinned and the diameter of the lithium sheet cylinder can be increased under the condition that the lithium sheet cylinder, the shell and the driven rotary roller rotate, when the rotation axis of the lithium sheet cylinder and the rotation axis of the shell are coincident, namely the side wall of the lithium sheet cylinder is tightly attached to the inner wall of the shell, and the lithium sheet cylinder serving as a negative electrode of a lithium battery is installed in the shell.
Further, in the operation of controlling the shaping column and the inner wall of the shell to jointly perform thin pressing on the side wall of the lithium sheet cylinder, the driven roller is also controlled to rotate, and the rotating direction of the driven roller is opposite to that of the shaping column.
It should be noted that, when the driven roller is driven by the shaping column to rotate, the driven roller rotates, and the rotation direction of the driven roller is opposite to that of the shaping column, so that the overall rotation speed can be improved, and the efficiency of the thin pressing operation can be improved. Specifically, when driven commentaries on classics roller and casing butt, certain frictional force has each other, when the setting post rotates, need provide great turning force and just enable driven commentaries on classics roller and casing and rotate, consequently, through control driven commentaries on classics roller self takes place to rotate to can improve holistic turning force, make slew rate obtain improving, improve the efficiency of thin pressure operation from this.
And S160, extracting the shaping column from the lithium sheet cylinder.
In one embodiment, the operation of extracting the shaped pillars from the lithium sheet cartridge specifically includes the following steps: controlling the driven roller to move towards the direction far away from the outer wall of the shell so as to reduce the pressing force of the driven roller on the outer wall of the shell; controlling the shaping column to rotate reversely so that the shaping column is debonded from the inner wall of the lithium sheet cylinder; and drawing the shaping column out of the lithium sheet cylinder.
It should be noted that, in the thin pressing operation, the lithium sheet cylinder becomes thin and has a larger diameter only under the mutual pressing and holding effect of the inner wall of the casing and the shaping column, and the lithium sheet cylinder has a certain viscosity, after the thin pressing operation is completed, the part of the shaping column can be adhered to the lithium sheet cylinder, at this time, if the shaping column is pulled out, the lithium sheet cylinder adhered to the inner wall of the casing may deform, and thus, the lithium sheet cylinder may be scrapped. Therefore, after the thin pressing operation is completed, the driven rotary roller is controlled to move in the direction away from the outer wall of the shell so as to reduce the pressing force of the driven rotary roller on the outer wall of the shell, at the moment, the driven rotary roller is only abutted against the outer wall of the shell relative to the state in the thin pressing operation, so that the pressing force applied by the inner wall of the shell and the shaping column on the lithium sheet cylinder can be reduced, then the shaping column is controlled to rotate reversely, so that part of the lithium sheet cylinder adhered on the shaping column can be separated from the shaping column under the action of reverse force, namely, the adhesion force between the shaping column and the lithium sheet cylinder is reduced, so that the inner wall debonding operation of the lithium sheet cylinder is completed, at the moment, the shaping column is pulled out of the lithium sheet cylinder through a clamping jaw or a mechanical arm device, so that the drawing operation of the shaping column is completed, and the lithium sheet cylinder is obtained.
In one embodiment, in the operation of controlling the shaping column and the inner wall of the casing to jointly thin-press the side wall of the lithium sheet cylinder, the method specifically comprises the following steps: fixing the shell; the control twines lithium piece section of thick bamboo the setting post with the central axis of casing carries out circular motion as the centre of a circle, and makes the setting post pass through lithium piece section of thick bamboo lateral wall is pressed and is held on the shells inner wall, be used for making the setting post with shells inner wall is common to carry out thin pressure operation to lithium piece section of thick bamboo lateral wall, so that the lateral wall of lithium piece section of thick bamboo becomes thin with the diameter increase of lithium piece section of thick bamboo, until the axis of rotation of lithium piece section of thick bamboo with the axis of rotation of casing coincides mutually, be used for making lithium piece section of thick bamboo lateral wall with the bonding of shells inner wall.
Referring to fig. 4, after the casing 200c is fixed by a positioning mechanism 500 such as a casing clamping jaw or a positioning fixture, the shaping column 400c wound with the lithium sheet cylinder 300c is controlled to perform circular motion around the central axis of the casing, and the shaping column is pressed against the inner wall of the casing through the side wall of the lithium sheet cylinder, so that the shaping column and the inner wall of the casing can jointly press the side wall of the lithium sheet cylinder and make the side wall of the lithium sheet cylinder adhere to the inner wall of the casing under the condition that the shaping column performs circular motion, thereby completing the thin pressing operation of the side wall of the lithium sheet cylinder, while the shaping column performs circular motion, the side wall of the lithium sheet cylinder becomes thin and the diameter of the lithium sheet cylinder increases, when the rotation axis of the lithium sheet cylinder coincides with the rotation axis of the casing, namely, the side wall of the lithium sheet cylinder closely adheres to the inner wall of the casing, thereby the lithium sheet cartridge as a negative electrode of the lithium battery is fitted into the case. In this embodiment, the rotation operation of the shaping column may be performed by using a driving mechanism such as a motor rotating plate structure or a cam link structure, for example, the shaping column is disposed on the rotating plate and is driven by a motor to rotate, so as to drive the shaping column to perform a circular motion with the central axis of the casing as a center, thereby enabling the shaping column to perform a thinning operation on the lithium sheet cylinder.
Further, when the shaping column performs circular motion, the shaping column is also controlled to rotate.
It should be noted that, when the shaping column performs circular motion, the shaping column is controlled to rotate, so that the lithium sheet cylinder can be better attached to the inner wall of the shell during thin pressing operation, and simultaneously, the shaping column rotates when performing circular motion, so that the shaping column can be better separated from the lithium sheet cylinder while rotating synchronously, that is, the adhesion force between the shaping column and the lithium sheet cylinder is relatively small.
Still further, the shaping post is also controlled to move gradually away from the central axis of the housing as the shaping post makes a circular motion.
The shaping column is controlled to gradually move towards the central axis far away from the shell, so that a pressing force can be continuously applied to the lithium sheet cylinder when the shaping column performs circular motion, the lithium sheet cylinder is quickly thinned in the process of thin pressing operation, and the lithium sheet cylinder can be tightly attached to the inner wall of the shell.
Compared with the prior art, the invention has at least the following advantages:
according to the lithium battery cathode shell filling method, operations such as slicing, tube forming, shell filling, thin-pressing shaping and the like are performed on the lithium belt serving as the lithium battery cathode, so that the lithium sheet tube serving as the cathode can be tightly attached to the inner wall of the battery shell, the processing operation is simple, the stability of the whole structure of the lithium battery can be effectively improved, and the electrical performance of the lithium battery is more stable.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for encasing a negative electrode of a lithium battery, comprising the steps of:
unreeling a lithium belt, and cutting the lithium belt to obtain a lithium sheet;
winding the lithium sheet outside the shaping column to obtain a lithium sheet cylinder;
pressing the side wall of the lithium sheet cylinder outside the shaping column to shape the lithium sheet cylinder;
inserting the shaping column and the lithium sheet cylinder into a shell together, and leaving a gap between the side wall of the lithium sheet cylinder and the inner wall of the shell;
controlling the shaping column and the inner wall of the shell to jointly perform thin pressing operation on the side wall of the lithium sheet cylinder so as to thin the side wall of the lithium sheet cylinder and increase the diameter of the lithium sheet cylinder, and bonding the side wall of the lithium sheet cylinder with the inner wall of the shell so as to load the lithium sheet cylinder serving as a negative electrode of a lithium battery into the shell;
withdrawing the shaped pillars from the lithium sheet cartridge;
in the operation of controlling the shaping column and the inner wall of the shell to jointly thin-press the side wall of the lithium sheet cylinder, the method specifically comprises the following steps:
the inner wall or the outer wall of the driven rotary roller is used for propping against the outer wall of the shell;
and the shaping column presses and holds the inner wall of the shell through the side wall of the lithium sheet cylinder;
and controlling the shaping column to rotate so as to drive the lithium sheet cylinder, the shell and the driven rotary roller to rotate, and enabling the rotation axis of the shaping column, the rotation axis of the lithium sheet cylinder and the rotation axis of the shell not to coincide with each other, so that the shaping column and the inner wall of the shell jointly perform thin pressing operation on the side wall of the lithium sheet cylinder, so that the side wall of the lithium sheet cylinder becomes thin and the diameter of the lithium sheet cylinder is increased until the rotation axis of the lithium sheet cylinder and the rotation axis of the shell coincide with each other, and the side wall of the lithium sheet cylinder is bonded with the inner wall of the shell.
2. A method of encasing a negative electrode for a lithium battery as defined in claim 1, wherein said driven roller is further controlled to rotate by itself in a direction opposite to a direction of rotation of said shaping pole.
3. The method for encasing the negative electrode of a lithium battery as recited in claim 1, further comprising the steps of, during said step of extracting said shaped pillars from said lithium sheet cartridge:
controlling the driven roller to move towards the direction far away from the outer wall of the shell so as to reduce the pressing force of the driven roller on the outer wall of the shell;
controlling the shaping column to rotate reversely so that the shaping column is debonded from the inner wall of the lithium sheet cylinder;
and drawing the shaping column out of the lithium sheet cylinder.
4. The method for encasing the negative electrode of a lithium battery as recited in claim 1, further comprising the following steps in said step of controlling said shaping pillars and said inner wall of said case to jointly thin-press said side walls of said lithium sheet container:
fixing the shell;
the shaping column wound with the lithium sheet cylinder is controlled to perform circular motion by taking the central axis of the shell as a circle center, and the shaping column is pressed on the inner wall of the shell through the side wall of the lithium sheet cylinder and is used for enabling the shaping column and the inner wall of the shell to perform thin pressing operation on the side wall of the lithium sheet cylinder together so as to enable the side wall of the lithium sheet cylinder to be thin and the diameter of the lithium sheet cylinder to be increased until the rotating axis of the lithium sheet cylinder coincides with the rotating axis of the shell, and the side wall of the lithium sheet cylinder is bonded with the inner wall of the shell.
5. A method of encasing a negative electrode for a lithium battery as recited in claim 4, wherein said shape-setting pole is also controlled to rotate by itself while said shape-setting pole performs a circular motion.
6. A method of encasing a negative electrode for a lithium battery as recited in claim 4 wherein said shaped posts are also controlled to move away from a central axis of said case as said shaped posts make said circular motion.
7. The method for encasing the negative electrode of a lithium battery as recited in claim 1, wherein a pressing jig is used to shape the lithium sheet cartridge, the pressing jig includes a plurality of arcuate engagement surfaces capable of moving toward the side wall of the lithium sheet cartridge, and the arcuate engagement surfaces jointly press against the side wall of the lithium sheet cartridge to shape the lithium sheet cartridge.
8. A method for encasing a negative electrode of a lithium battery as recited in claim 1, further comprising the following steps in said step of winding a lithium sheet around said shaped pillar to obtain a lithium sheet cartridge:
a lithium sheet pressing piece is used for pressing and attaching part of the lithium sheet to the shaping column and tilting opposite sides of the lithium sheet;
and adopting a tube-forming pressing piece for pressing and holding the opposite sides of the lithium sheet and contacting the opposite sides of the lithium sheet to obtain the lithium sheet tube.
9. The method for encasing the negative electrode of a lithium battery as recited in claim 8, wherein the lithium sheet pressing member has a semicircular groove, and a side wall of the semicircular groove is used for pressing and attaching a part of the lithium sheet to the shape-defining pillar, and tilting opposite sides of the lithium sheet.
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| CN201910161284.5A CN110048165B (en) | 2019-03-04 | 2019-03-04 | Lithium battery cathode shell-mounting method |
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| CN201910161284.5A CN110048165B (en) | 2019-03-04 | 2019-03-04 | Lithium battery cathode shell-mounting method |
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| KR101064236B1 (en) * | 2006-12-23 | 2011-09-14 | 주식회사 엘지화학 | Cylindrical Secondary Battery Containing Center Pin of Improved Safety to External Impact |
| CN201298577Y (en) * | 2008-11-01 | 2009-08-26 | 惠州亿纬锂能股份有限公司 | Lithium wafer processing device |
| CN101399372B (en) * | 2008-11-01 | 2012-07-18 | 惠州亿纬锂能股份有限公司 | Lithium plate machining device |
| CN102769143B (en) * | 2012-07-11 | 2015-01-28 | 武汉市汉泰斯特科技有限公司 | Automatic production line for button type lithium battery |
| CN206727178U (en) * | 2016-12-15 | 2017-12-08 | 武汉亿德光兴科技有限公司 | A kind of cathode of lithium battery automatic assembling apparatus |
| CN107799805B (en) * | 2017-09-07 | 2019-08-27 | 惠州亿纬锂能股份有限公司 | A kind of lithium piece is adjacent to steel shell internal wall system |
| CN107895772B (en) * | 2017-11-14 | 2020-05-19 | 惠州亿纬锂能股份有限公司 | Lithium sheet molding and casing system and lithium battery molding production equipment thereof |
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