CN109659490B - Button cell lithium negative electrode forming equipment and forming method - Google Patents
Button cell lithium negative electrode forming equipment and forming method Download PDFInfo
- Publication number
- CN109659490B CN109659490B CN201910010866.3A CN201910010866A CN109659490B CN 109659490 B CN109659490 B CN 109659490B CN 201910010866 A CN201910010866 A CN 201910010866A CN 109659490 B CN109659490 B CN 109659490B
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- Prior art keywords
- negative electrode
- metal sheet
- lithium
- lithium metal
- concave cavity
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 98
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000000465 moulding Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- 239000011324 bead Substances 0.000 claims 2
- 238000005096 rolling process Methods 0.000 abstract description 4
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 8
- 238000007789 sealing Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010405 anode material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0433—Molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Primary Cells (AREA)
Abstract
The invention relates to button cell lithium negative electrode forming equipment and a forming method, wherein the button cell lithium negative electrode forming equipment comprises a forming press head and a driving part, wherein the driving part drives the forming press head to move up and down, and the center of the head end of the forming press head is provided with a positioning concave cavity which is matched with the shape of a formed lithium negative electrode; the negative pole top is placed on the placing platform, and the cut lithium metal sheet is placed in the central area of the bottom cover of the negative pole top; then the driving part drives the forming press head to press down on the lithium metal sheet, and the lithium metal sheet is positioned in the positioning concave cavity of the forming press head; the forming press head is continuously pressed onto the bottom cover of the negative electrode top, and the lithium metal sheet is rolled to be in the shape consistent with the positioning concave cavity and is adhered onto the bottom cover of the negative electrode top; the lithium metal sheet has better rolling property and ductility, when the forming pressure head applies pressure to the lithium metal sheet, the lithium metal sheet can be expanded and diffused into the positioning concave cavity, and the shape of the lithium metal sheet in the cathode top can be ensured by presetting the volume and the shape of the positioning concave cavity.
Description
Technical Field
The invention relates to the field of lithium-manganese button cells, in particular to button cell lithium negative electrode forming equipment and a forming method.
Background
The lithium manganese button cell has high requirements on the leakage resistance and the electrical property of the cell. The lithium-manganese button cell comprises a positive electrode cup, a negative electrode top, a sealing ring, lithium metal, a positive electrode cake, a diaphragm and electrolyte, wherein the positive electrode cake is separated from a lithium negative electrode (lithium metal sheet) through the diaphragm, and the positive electrode cup is insulated from the negative electrode top through the sealing ring.
The structure of the lithium manganese button cell is shown in fig. 1, and the specific production process is as follows: and sequentially placing lithium metal, a diaphragm, electrolyte, a positive electrode cake and a positive electrode cup in the negative electrode top, then bending the positive electrode cup, bending a sealing ring by using the upper edge of the positive electrode cup and wrapping the negative electrode top, thereby completing the assembly of the lithium-manganese button cell.
The traditional method for forming the lithium anode of the battery comprises the following steps: and placing a cuboid lithium metal sheet with a certain thickness and width into the center of the top of the negative electrode, and pressing the cuboid lithium metal sheet into a round sheet by a pressing tool to be tiled in the top surface. If the lithium metal sheet is placed in the negative electrode top, the lithium metal position is deviated and not on the center of the negative electrode top, so that when the lithium metal sheet is pressed into a sheet, the deviation easily occurs; this can have the following consequences: 1. the sealing ring sleeved on the top of the negative electrode is extruded and deviated (as shown in figure 2), and after the battery is sealed and molded, the leakage-proof performance of the button battery can be influenced by the deviated sealing ring; 2. because of the offset of the lithium metal sheet, a shear notch is formed at the offset position of the lithium metal sheet, and when the diaphragm is punched into the cathode top, the diaphragm is easily crushed (see fig. 3), so that the battery is short-circuited.
Disclosure of Invention
The invention aims to solve the technical problem of providing novel button cell lithium negative electrode forming equipment, wherein the formed lithium negative electrode is positioned at the center of the negative electrode top, so that the leakage-proof performance and the electrical performance of a battery can be improved; further provided is a molding method using the molding apparatus.
The technical scheme adopted for solving the technical problems is as follows: the button cell lithium negative electrode forming equipment is characterized by comprising a forming press head and a driving part, wherein the driving part drives the forming press head to move up and down, and the center of the head end of the forming press head is provided with a positioning concave cavity which is matched with the formed lithium negative electrode in shape.
The invention further preferably comprises the following steps: the periphery of the head end is provided with an annular flange protruding forwards in the central area so as to form the positioning concave cavity in the center of the head end.
The invention further preferably comprises the following steps: the locating concave cavity is in a circular shape, the depth of the locating concave cavity is 0.4-0.8mm, and the diameter of the locating concave cavity is 15-18mm.
The invention further preferably comprises the following steps: at least a part of the area of the horizontal bottom surface of the positioning concave cavity is provided with deceleration grains; the deceleration lines can delay the outward flowing speed of the lithium material after being pressed.
The invention further preferably comprises the following steps: the deceleration lines are a plurality of convex ribs protruding on the horizontal bottom surface or a plurality of grooves sinking on the horizontal bottom surface.
The invention further preferably comprises the following steps: the distribution trend of the deceleration lines is that the deceleration lines radially extend from the center of the horizontal bottom surface of the positioning concave cavity to the inner side of the annular flange.
The invention further preferably comprises the following steps: the width of the convex rib or the groove is 0.5-1.2mm, and the height of the convex rib or the groove is 0.5-1.2mm.
The invention further preferably comprises the following steps: the driving part is a motor or an oil cylinder.
The invention further preferably comprises the following steps: the device also comprises a placement platform for placing the negative pole top.
The invention further preferably comprises the following steps: the diameter of the forming press head is smaller than that of the bottom cover of the negative electrode top, so that the forming press head can act on the bottom cover of the negative electrode top.
Another subject is: the molding method of the button cell lithium negative electrode molding equipment is characterized by comprising the following steps: 1) The negative pole top is placed on the placing platform, and the cut square lithium metal sheet is placed in the central area of the bottom cover of the negative pole top; 2) The driving part drives the forming press head to press down on the lithium metal sheet, and the lithium metal sheet is positioned in the positioning concave cavity of the forming press head; and the forming press head is continuously pressed onto the bottom cover of the negative electrode top, and the lithium metal sheet is rolled to be in the shape consistent with the positioning concave cavity and is adhered onto the bottom cover of the negative electrode top.
Compared with the prior art, the invention has the advantages that the center of the head end of the forming press head is provided with the positioning concave cavity which is matched with the appearance of the formed lithium cathode, the forming press head presses down the blocky lithium metal sheet, rolls the lithium metal sheet into the appearance which is consistent with the positioning concave cavity, and can avoid the situation that the formed lithium metal sheet is deviated by setting the forming press head at the top of the cathode, thereby preventing the problems of liquid leakage and short circuit after the button cell is assembled.
The lithium metal sheet has better rolling property and ductility, when the forming pressure head applies pressure to the lithium metal sheet, the lithium metal sheet can be expanded and diffused into the positioning concave cavity, and the shape of the lithium metal sheet in the cathode top can be ensured by presetting the volume and the shape of the positioning concave cavity.
Drawings
FIG. 1 is a schematic diagram of a prior art lithium manganese button cell;
FIG. 2 is a schematic illustration of a prior art extrusion deflection of a seal ring by lithium metal;
FIG. 3 is a schematic view of a prior art lithium metal sheet with a slit formed by deflection;
FIG. 4 is a schematic view of a lithium metal sheet placed in the bottom cap of the negative top;
FIG. 5 is a state I when a lithium metal sheet is rolled by a button cell lithium negative electrode forming apparatus;
FIG. 6 is a second state of the button cell lithium negative electrode molding apparatus rolling a lithium metal sheet;
fig. 7 is a schematic view of the structure of the negative electrode top after the lithium metal sheet is roll-formed.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
The structure of the lithium manganese button cell is shown in fig. 1, and the specific production process is as follows: the lithium metal sheet 20, the diaphragm 53, the electrolyte, the positive electrode cake 51 and the positive electrode cup 52 are sequentially placed in the negative electrode top 1, then the positive electrode cup 52 is subjected to bending treatment, and the sealing ring 54 is bent by the upper edge of the positive electrode cup 52 and wraps the negative electrode top 1, so that the lithium manganese button cell is assembled. The invention mainly describes equipment and a forming method for processing the negative pole top in detail:
as one of ordinary skill in the art will readily recognize, the hardness of the lithium metal typically used for the battery anode material is 0.6HV, which is a parameter that indicates that the lithium metal material described in this example is softer and has better ductility; the lithium metal can be easily stretched when pressed by a heavy object. This description is of great significance to the apparatus and method for molding lithium negative electrodes of button cells, which will be described in detail below.
As shown in fig. 4 to 7, the lithium negative electrode molding apparatus for a button cell comprises a molding press 10 and a driving part, wherein the driving part drives the molding press 10 to move up and down, and the center of the head end of the molding press 10 is provided with a positioning concave cavity 11 which is matched with the shape of the molded lithium negative electrode.
As shown in fig. 5 and 6, for the center of the head end of the forming ram 10 to have a positioning cavity 11 that matches the shape of the formed lithium negative electrode, the producer places the lithium metal sheet 20 in the positioning cavity 11; the forming press head 10 presses down the massive lithium metal sheet 20, rolls lithium metal into the shape consistent with the positioning concave cavity 11, and can avoid the situation that the formed lithium metal sheet 20 is deviated as long as the position of the forming press head 10 on the negative electrode top 1 is set, so that the problems of leakage and short circuit after the button cell is assembled are prevented.
As shown in fig. 7, the lithium metal sheet 20 has better rolling property and ductility, when the forming press 10 applies pressure to the lithium metal sheet 20, the lithium metal sheet 20 can be spread and spread into the positioning cavity 11, the shape of the lithium metal sheet 20 in the negative electrode top 1 can be ensured by presetting the volume and shape of the positioning cavity 11, and the position of the forming press 10 in the negative electrode top 1 can be controlled by controlling the position of the positioning cavity 11 in the negative electrode top 1, so long as the lithium metal sheet 20 is pressed down, the rolled lithium metal sheet 20 can be ensured to be in the positioning cavity 11.
Specifically, the periphery of the head end of the forming ram 10 is provided with an annular rib 12 projecting forwardly of the central region to form a locating recess 11 in the center of the head end. The annular rib 12 prevents the rolled lithium metal sheet 20 from overflowing the positioning cavity 11 to ensure that the lithium metal material is within the positioning cavity 11.
The positioning concave cavity 11 is in a circular shape, the depth of the positioning concave cavity 11 is 0.4-0.8mm, and the diameter of the positioning concave cavity 11 is 15-18mm.
The horizontal bottom surface of the positioning cavity 11 is provided with deceleration grains 13, and the deceleration grains 13 are mainly used for delaying the outward flowing speed of the extruded material.
Preferably, the deceleration lines 13 may be uniformly distributed on the horizontal bottom surface of the positioning cavity 11, or the deceleration lines 13 may be disposed in a partial area of the horizontal bottom surface of the positioning cavity 11, so that the producer can adjust the speed of the extruded and outward flow of the finishing material according to the actual requirement.
Preferably, the deceleration grain 13 is a plurality of ribs protruding from the horizontal bottom surface, and of course, the deceleration grain 13 may be a plurality of grooves recessed from the horizontal bottom surface, so that the producer may consider that the deceleration grain 13 is arranged into the ribs or grooves according to the angle of convenient practical processing, and of course, the ribs or grooves may also be combined. The pressing pressure of the forming ram 10 is approximately 0.8-1.2 tons, preferably 1 ton.
The pressure formed by the weight in the present embodiment acts on the lithium metal sheet 20, and the lithium metal sheet 20 exhibits a fluid characteristic such that it can be uniformly and sufficiently spread in the area defined by the positioning cavity 11; the deceleration lines 13 in the embodiment can control the overflow speed of the solid lithium metal sheet 20 fluid, so as to ensure that the lithium metal sheet 20 does not overflow the area defined by the positioning concave cavity 11 when being pressed. The lithium metal sheet 20 can be uniformly, sufficiently and non-overflowingly extended in the positioning cavity 11 as appropriate, and the above technical effects are embodying the inventive gist to be described of the button cell lithium anode forming apparatus of the present embodiment.
If the deceleration strip 13 is provided only in a partial region of the horizontal bottom surface of the positioning pocket 11, the deceleration strip 13 preferably runs radially from the center of the horizontal bottom surface of the positioning pocket 11 to the inside of the annular rib 12.
The width of the ribs or grooves as the deceleration grain 12 is 0.5-1.2mm, and the height of the ribs or grooves is 0.5-1.2mm.
The driving member used in the present embodiment is a motor or an oil cylinder.
The button cell lithium negative electrode forming equipment also comprises a placing platform for placing the negative electrode top 1. When the negative electrode top 1 is required to be processed, the negative electrode top 1 is placed on a placing platform so that the subsequent forming press head 10 can press the lithium metal sheet 20 in the negative electrode top 1.
The diameter of the forming ram 10 is smaller than the diameter of the bottom cap 2 of the negative electrode top 1 so that the forming ram 10 can act on the bottom cap 2 of the negative electrode top 1.
As shown in fig. 4 to 7, the molding method of the button cell lithium negative electrode molding apparatus includes the steps of: 1) The cathode top 1 is placed on a placing platform, and a square lithium metal sheet 20 which is cut is placed in the central area of the bottom cover 2 of the cathode top 1; 2) The driving part drives the forming press head 10 to press down on the lithium metal sheet 20, and the lithium metal sheet 20 is positioned in the positioning concave cavity 11 of the forming press head 10; the forming press 10 continues to press onto the bottom cover 2 of the negative top, and the lithium metal sheet 20 is rolled to a shape conforming to the positioning cavity 11 and bonded to the bottom cover 2 of the negative top 1.
The invention has been described in detail with reference to the apparatus and method for forming lithium negative electrodes of button cells, and specific examples are provided herein to illustrate the principles and embodiments of the invention, and the above examples are provided only to assist in understanding the invention and core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. The button cell lithium negative electrode forming equipment is characterized by comprising a forming press head and a driving part, wherein the driving part drives the forming press head to move up and down, the center of the head end of the forming press head is provided with a positioning concave cavity which is matched with the shape of the formed lithium negative electrode, and the periphery of the head end is provided with an annular flange which protrudes forwards in a central area so as to form the positioning concave cavity in the center of the head end;
the horizontal bottom surface of the positioning concave cavity is provided with deceleration grains; the deceleration lines can delay the outward flowing speed of the lithium material after being pressed;
the deceleration lines are a plurality of convex ribs protruding on the horizontal bottom surface or a plurality of grooves recessed on the horizontal bottom surface;
the distribution trend of the deceleration lines is that the deceleration lines radially extend from the center of the horizontal bottom surface of the positioning concave cavity to the inner side of the annular flange.
2. The lithium negative electrode molding equipment for button cell of claim 1, wherein the positioning concave cavity is circular, the depth of the positioning concave cavity is 0.4-0.8mm, and the diameter of the positioning concave cavity is 15-18mm.
3. The button cell lithium anode forming apparatus according to claim 2, wherein the width of the bead or the groove is 0.5-1.2mm, and the height of the bead or the groove is 0.5-1.2mm.
4. The lithium negative electrode molding apparatus of button cell of claim 1, further comprising a placement platform for placement of the negative electrode top.
5. The lithium negative electrode molding apparatus of button cell of claim 1, wherein the molding press has a diameter smaller than a diameter of the bottom cap of the negative electrode top so that the molding press can act on the bottom cap of the negative electrode top.
6. The molding method of the button cell lithium anode molding apparatus according to any one of claims 1 to 5, characterized by comprising the steps of:
1) The negative pole top is placed on the placing platform, and the cut square lithium metal sheet is placed in the central area of the bottom cover of the negative pole top;
2) The driving part drives the forming press head to press down on the lithium metal sheet, and the lithium metal sheet is positioned in the positioning concave cavity of the forming press head; the forming press head at the head end is continuously pressed onto the bottom cover of the negative electrode top, and the lithium metal sheet is rolled to be in the shape consistent with the positioning concave cavity and is adhered to the bottom cover of the negative electrode top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910010866.3A CN109659490B (en) | 2019-01-07 | 2019-01-07 | Button cell lithium negative electrode forming equipment and forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910010866.3A CN109659490B (en) | 2019-01-07 | 2019-01-07 | Button cell lithium negative electrode forming equipment and forming method |
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| Publication Number | Publication Date |
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| CN109659490A CN109659490A (en) | 2019-04-19 |
| CN109659490B true CN109659490B (en) | 2024-03-26 |
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| CN112958734A (en) * | 2021-02-03 | 2021-06-15 | 大连交通大学 | Preparation method and application of two-dimensional metal lithium |
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| " Nontrivial Effects of "Trivial" Parameters on the Performance of Lithium-Sulfur Batteries";Liao Junbin等;《BATTERIES-BASEL》;20180630;第4卷(第2期);第1-12页 * |
| "基于结合强度的金属塑料复合材料压制成型";黄殿凯 等;《工程塑料应用》;20131130;第41卷(第11期);第60-63页 * |
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| CN109659490A (en) | 2019-04-19 |
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