CN107785534B - Lithium manganese button cell negative pole top, lithium manganese button cell and processing method - Google Patents
Lithium manganese button cell negative pole top, lithium manganese button cell and processing method Download PDFInfo
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- CN107785534B CN107785534B CN201711045842.9A CN201711045842A CN107785534B CN 107785534 B CN107785534 B CN 107785534B CN 201711045842 A CN201711045842 A CN 201711045842A CN 107785534 B CN107785534 B CN 107785534B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Primary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a lithium manganese button cell negative pole top, a lithium manganese button cell and a processing method, wherein the lithium manganese button cell comprises a positive pole cup, a negative pole top, a sealing ring, lithium metal, a positive pole cake, a diaphragm and electrolyte, wherein the positive pole cake and the lithium metal are separated by the diaphragm, the positive pole cup and the negative pole top are insulated by the sealing ring, the electrolyte is filled in a cavity formed by the negative pole top and the positive pole cup, the negative pole top comprises a top part and a peripheral side part, and the peripheral side part comprises an annular inner wall and a flanging wall which are integrally connected; applying downward acting force to the flanging wall by a pressing block with an annular downward pressing surface, so that the peripheral side part of the negative pole top is in a structure of outwards inclining and expanding from top to bottom, the external expansion angle of the peripheral side part is 5-6 degrees, and the annular inner wall is tightly attached to the flanging wall; then, sequentially placing lithium metal, a diaphragm, electrolyte, a positive electrode cake and a positive electrode cup in the negative electrode top, bending the positive electrode cup, bending a sealing ring to wrap the negative electrode top by the upper edge of the positive electrode cup, and completing the assembly of the lithium-manganese button cell.
Description
Technical Field
The invention relates to a button cell, in particular to a lithium manganese button cell negative pole top, a lithium manganese button cell and a processing method.
Background
In the production process of the lithium manganese button cell, the leakage-proof performance of the cell is a great test. 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 the lithium metal through the diaphragm, and the positive electrode cup is insulated from the negative electrode top through the sealing ring. The lithium manganese button cell is produced by the following steps: and sequentially placing lithium metal, a diaphragm, electrolyte, a positive electrode cake and a positive electrode cup in the top of the negative electrode, bending the positive electrode cup, and bending a sealing ring to wrap the top of the negative electrode by using the upper edge of the positive electrode cup, so that the lithium-manganese button cell is assembled.
The structure diagram of the negative electrode top of the conventional lithium manganese button cell is shown in fig. 1, the flanging of the negative electrode top is vertical to the horizontal plane, and meanwhile, the flanging is not completely attached to the inner side edge, so that a gap L exists, and the flanging angle a is a right angle, as shown in fig. 1. The button cell of this structure has the following problems:
1. because the flanging of the negative electrode top is vertical to the horizontal plane, the battery can be subjected to a transverse extrusion force when being sealed, and the negative electrode top can be inwards concave due to stress, so that the battery is scrapped.
2. Because the corner is right angle, this sharp angle (right angle) is produced when cutting off by the material, and because battery shoulder department sealing washer can be by sharp angle obvious extrusion deformation even break, causes the battery leak protection performance not good.
3. Since the battery is filled with electrolyte, the electrolyte is squeezed out during sealing. Thus, the electrolyte remains in the gap L, and when the electrolyte absorbs moisture in the later use, white substances are separated out, so that the phenomenon of false leakage is caused.
Disclosure of Invention
The invention aims to provide a lithium manganese button cell negative pole top with good leakage prevention effect, and further provides a lithium manganese button cell utilizing the negative pole top and a processing method of the lithium manganese button cell negative pole top.
The technical scheme adopted for solving the technical problems is as follows: the lithium manganese button cell negative pole top comprises a top part and a peripheral part, wherein the peripheral part comprises an annular inner wall and a flanging wall which are integrally connected, and the lithium manganese button cell negative pole top is characterized in that the peripheral part is of a structure which is outwards inclined and expanded from top to bottom, the external expansion angle of the peripheral part is 5-6 degrees, and the annular inner wall and the flanging wall are mutually extruded together.
The invention further preferably comprises the following steps: the outer side of the upper end of the flanging wall is in an arc shape.
The invention further preferably comprises the following steps: the annular inner wall comprises a lower section wall and an upper inclined wall, the lower section wall and the flanging wall are mutually extruded together, and an integral external expansion angle formed by the lower section wall and the flanging wall is 5-6 degrees.
The invention further preferably comprises the following steps: 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 the lithium metal through the diaphragm, the positive electrode cup is insulated from the negative electrode top through the sealing ring, the electrolyte is filled in a cavity formed by the negative electrode top and the positive electrode cup, the negative electrode top comprises a top and a peripheral side part, and the peripheral side part comprises an annular inner wall and a flanging wall which are integrally connected.
The invention further preferably comprises the following steps: the outer side of the upper end of the flanging wall is in an arc shape.
The invention further preferably comprises the following steps: the annular inner wall comprises a lower section wall and an upper inclined wall, the lower section wall and the flanging wall are mutually extruded together, and an integral external expansion angle formed by the lower section wall and the flanging wall is 5-6 degrees.
The invention further preferably comprises the following steps: the processing method of the lithium manganese button cell is characterized by comprising the following steps: 1) Preparing a cathode top, wherein the cathode top comprises a top part and a peripheral part, the peripheral part comprises an annular inner wall and a flanging wall which are integrally connected, the flanging wall is vertical to a horizontal plane, a certain gap exists between the annular inner wall and the flanging wall, and the annular inner wall comprises a lower section wall and an upper inclined wall;
2) Preparing a pressing block, wherein the pressing block is provided with an annular pressing surface with an inclined angle, the annular pressing surface forms an included angle of 4-5 degrees with the horizontal surface, the horizontal height of the annular pressing surface is increased from outside to inside, and the annular pressing surface of the pressing block is used for applying a downward acting force to the flanging wall, so that the lower section wall and the flanging wall are mutually extruded to eliminate the gap, and simultaneously, the lower section wall and the flanging wall form an external expanding angle of 5-6 degrees as a whole;
3) Sequentially placing lithium metal, a diaphragm, electrolyte, a positive electrode cake and a positive electrode cup in the negative electrode top, bending the positive electrode cup, and bending a sealing ring to wrap the negative electrode top by using the upper edge of the positive electrode cup, thereby completing the assembly of the lithium-manganese button cell
Compared with the prior art, the cathode top has the advantages that the external expansion angle of the peripheral part of the cathode top is 5-6 degrees, and the cathode top cannot be inwards recessed due to stress when the cathode cup is bent and hemmed.
Meanwhile, as the flanging wall and the annular inner wall are extruded together and the joint disappears, electrolyte cannot remain in the joint of the cathode top in the process of filling the battery, and no false leakage phenomenon occurs.
In addition, the outer side of the upper end of the flanging wall is in an arc shape, and when the anode cup is bent and hemmed, the sealing ring cannot be damaged due to disappearance of the sharp angle, so that the liquid leakage phenomenon is further prevented.
Drawings
FIG. 1 is a schematic diagram of a prior art negative pole top;
FIG. 2 is a schematic diagram of a prior art lithium manganese button cell prior to assembly;
FIG. 3 is a schematic view of an assembled lithium manganese button cell in the prior art;
FIG. 4 is a schematic view of the structure of the negative pole top before the press block acts on the flanging wall;
FIG. 5 is a schematic diagram of the structure of the negative pole top of the flange wall thickness acted by the pressing block in the invention;
FIG. 6 is a schematic view showing the structure of a lithium manganese button cell before assembly according to the present invention;
fig. 7 is a schematic structural view of an assembled lithium manganese button cell according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
At present, traditional lithium manganese button cell, including anodal cup 2, negative pole top 3, sealing washer 4, lithium metal 7, anodal cake 5, diaphragm 6 and electrolyte, separate through diaphragm 6 between anodal cake 5 and the lithium metal 7, it is insulating through sealing washer 4 between anodal cup 2 and the negative pole top 3, electrolyte is filled in the cavity that negative pole top 3 and anodal cup 2 formed, wherein the structure diagram of negative pole top 3 is as shown in fig. 1, negative pole top 3 includes top 8 and week lateral part 9, week lateral part 9 includes annular inner wall 91 and turn-ups wall 92 of body coupling, turn-ups wall 92 and horizontal plane of negative pole top 3 are perpendicular, simultaneously turn-ups wall 92 does not laminate completely with annular inner wall 91 between, therefore there is a clearance L, and turn-ups angle a is the right angle. As shown in fig. 2, the flanging angle a is a right angle, so that the sealing ring 4 at the battery shoulder part is obviously extruded and deformed by a sharp angle and even breaks, and the leakage-proof performance of the battery is poor; and the battery is filled with electrolyte, as shown in fig. 3, the electrolyte is extruded out when the battery is sealed, so that the electrolyte is remained at the gap L, and white substances are separated out when the electrolyte absorbs moisture during later use, thereby causing a false leakage phenomenon.
In addition, since the flanging wall 92 of the negative electrode top 3 is perpendicular to the horizontal plane, the battery is subjected to a transverse extrusion force during sealing, and the negative electrode top 3 is concaved inwards due to the stress, so that the battery is scrapped.
In order to solve the problems in the prior art, the invention has the following specific embodiments: as shown in fig. 6, the lithium manganese button cell 1 comprises a positive electrode cup 2, a negative electrode top 3, a sealing ring 4, lithium metal 7, a positive electrode cake 5, a diaphragm 6 and electrolyte, wherein the positive electrode cake 5 and the lithium metal 7 are separated by the diaphragm 6, the positive electrode cup 2 and the negative electrode top 3 are insulated by the sealing ring 4, the electrolyte is filled in a cavity formed by the negative electrode top 3 and the positive electrode cup 2, as shown in fig. 5, the negative electrode top 3 comprises a top 8 and a peripheral side 9, the peripheral side 9 comprises an annular inner wall 91 and a flanging wall 92 which are integrally connected, the peripheral side 9 is in a structure of outwards inclining and expanding from top to bottom, the external expansion angle of the peripheral side 9 is 5-6 degrees, and the annular inner wall 91 and the flanging wall 92 are mutually extruded together. The peripheral portion 9 is in an outward inclined and expanded structure from top to bottom, so that the problem that the battery is scrapped due to the fact that the flanging wall 92 of the negative electrode top 3 is perpendicular to the horizontal plane and the battery is subjected to a transverse extrusion force during sealing can be prevented, and the negative electrode top 3 is concaved inwards due to the stress.
The upper end outer side of the burring wall 92 has an arc shape 13. The upper end of the flanging wall 92 of the arc shape 13 can prevent the sealing ring 4 at the battery shoulder from being extruded, deformed or even broken by the sharp angle of the flanging on the flanging wall 92 in the prior art, so that the problem of poor leakage-proof performance of the battery is solved.
As shown in fig. 5, the annular inner wall 91 includes a lower wall 911 and an upper inclined wall 912, the lower wall 911 and the burring wall 92 are pressed together, and the external expansion angle of the lower wall 911 and the burring wall 92 forming a whole is 5-6 degrees.
The processing method of the lithium manganese button cell is characterized by comprising the following steps:
1) Preparing a cathode top 3, as shown in fig. 4, wherein the cathode top 3 comprises a top 8 and a peripheral side 9, the peripheral side 9 comprises an annular inner wall 91 and a flanging wall 92 which are integrally connected, the flanging wall 92 is vertical to the horizontal plane, a certain gap L exists between the annular inner wall 91 and the flanging wall 92, and as shown in fig. 4, the annular inner wall 91 comprises a lower section wall 911 and an upper inclined wall 912; at this time, the burring angle a on the burring wall 92 is a right angle.
2) As shown in fig. 4, a pressing block 10 is prepared, the pressing block 10 is provided with an annular pressing surface 11 with an inclined angle, the annular pressing surface 11 forms an included angle of 4-5 degrees with the horizontal surface, the horizontal height of the annular pressing surface 11 is increased from outside to inside, a downward acting force is applied to the flanging wall 92 by the annular pressing surface 11 of the pressing block 10, as shown in fig. 5, the lower section wall 911 and the flanging wall 92 are mutually extruded to eliminate a gap L, and simultaneously the lower section wall 911 and the flanging wall 92 form an external expansion angle of 5-6 degrees as a whole; after the clearance L is eliminated, even if the battery is filled with electrolyte, the electrolyte can not remain at the clearance L when the battery is extruded during sealing, and the phenomenon of false leakage is prevented from being caused when the electrolyte absorbs moisture during later use. Simultaneously, the lower section wall 911 and the flanging wall 92 are integrally formed into an external expansion angle of 5-6 degrees, so that when the battery is subjected to a transverse extrusion force during sealing, the negative electrode top 3 cannot be inwards concave due to stress, and the problem of scrapping of the battery is solved.
3) As shown in fig. 6 and 7, lithium metal 7, a diaphragm 6, electrolyte, a positive electrode cake 5 and a positive electrode cup 2 are sequentially placed in a negative electrode top 3, then the positive electrode cup 2 is subjected to bending treatment, and a sealing ring 4 is bent to wrap the negative electrode top 3 by using the upper edge of the positive electrode cup 2, so that the lithium manganese button cell is assembled.
As shown in fig. 4 and fig. 5, during the pressing process of the pressing block 10, the lower segment wall 911 and the flanging wall 92 form an external expansion angle, and due to the action of the annular pressing surface 11, as shown in fig. 5 to fig. 7, the outer side of the upper end of the flanging wall 92 presents a approximate arc shape 13, and during the bending and edge-wrapping process of the positive electrode cup 2, the sealing ring 4 is not damaged due to the disappearance of the sharp angle, so that the leakage phenomenon is further prevented. The annular pressing surface 11 of the pressing block 10 can be adjusted to be of an arc-shaped concave structure, so that the flanging wall 92 can be ensured to form the upper end of an arc shape 13.
The lithium manganese button cell cathode top, the lithium manganese button cell and the processing method provided by the invention are described in detail, specific examples are applied to illustrate the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the invention and the core idea. 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 (2)
1. The processing method of the lithium manganese button cell is characterized by comprising the following steps:
1) Preparing a cathode top, wherein the cathode top comprises a top part and a peripheral part, the peripheral part comprises an annular inner wall and a flanging wall which are integrally connected, the flanging wall is vertical to a horizontal plane, a certain gap exists between the annular inner wall and the flanging wall, and the annular inner wall comprises a lower section wall and an upper inclined wall;
2) Preparing a pressing block, wherein the pressing block is provided with an annular pressing surface with an inclined angle, the horizontal height of the annular pressing surface is increased from outside to inside, and the pressing block is of an arc-shaped concave structure; applying a downward acting force to the flanging wall by utilizing the annular downward pressure of the pressing block, so that the lower section wall and the flanging wall are mutually extruded to eliminate the gap, the outer side of the upper end of the flanging wall is in an arc shape, and simultaneously, the lower section wall and the flanging wall form an external expansion angle as a whole;
3) And sequentially placing lithium metal, a diaphragm, electrolyte, a positive electrode cake and a positive electrode cup in the top of the negative electrode, bending the positive electrode cup, and bending a sealing ring to wrap the top of the negative electrode by using the upper edge of the positive electrode cup, so that the lithium-manganese button cell is assembled.
2. The method for manufacturing a lithium manganese button cell according to claim 1, wherein the annular pressing surface forms an included angle of 4-5 degrees with the horizontal surface, and the degree of the external expansion angle is 5-6 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711045842.9A CN107785534B (en) | 2017-10-31 | 2017-10-31 | Lithium manganese button cell negative pole top, lithium manganese button cell and processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711045842.9A CN107785534B (en) | 2017-10-31 | 2017-10-31 | Lithium manganese button cell negative pole top, lithium manganese button cell and processing method |
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| Publication Number | Publication Date |
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| CN107785534A CN107785534A (en) | 2018-03-09 |
| CN107785534B true CN107785534B (en) | 2023-07-28 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108550718B (en) * | 2018-06-15 | 2024-01-19 | 宜昌力佳科技有限公司 | Button cell with base |
| WO2021114329A1 (en) * | 2019-12-13 | 2021-06-17 | 惠州亿纬锂能股份有限公司 | Winding-type button cell |
| WO2021114324A1 (en) * | 2019-12-13 | 2021-06-17 | 惠州亿纬锂能股份有限公司 | Winding bean type battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006066308A (en) * | 2004-08-30 | 2006-03-09 | Hitachi Maxell Ltd | Coin-shaped cell |
| CN101521267A (en) * | 2008-02-29 | 2009-09-02 | 肇庆新利达电池实业有限公司 | Negative cover of lithium/manganese button cell, lithium/manganese button cell and production method thereof |
| CN101944587A (en) * | 2010-08-06 | 2011-01-12 | 广州市鹏辉电池有限公司 | Lithium manganese button secondary cell cathode and cell |
| CN103050296A (en) * | 2012-12-18 | 2013-04-17 | 宁夏集盛星泰新能源科技有限公司 | Buckled dual-electric layer capacitor |
-
2017
- 2017-10-31 CN CN201711045842.9A patent/CN107785534B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006066308A (en) * | 2004-08-30 | 2006-03-09 | Hitachi Maxell Ltd | Coin-shaped cell |
| CN101521267A (en) * | 2008-02-29 | 2009-09-02 | 肇庆新利达电池实业有限公司 | Negative cover of lithium/manganese button cell, lithium/manganese button cell and production method thereof |
| CN101944587A (en) * | 2010-08-06 | 2011-01-12 | 广州市鹏辉电池有限公司 | Lithium manganese button secondary cell cathode and cell |
| CN103050296A (en) * | 2012-12-18 | 2013-04-17 | 宁夏集盛星泰新能源科技有限公司 | Buckled dual-electric layer capacitor |
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| CN107785534A (en) | 2018-03-09 |
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