CN107508004B - High-power lithium manganese button cell and preparation method thereof - Google Patents
High-power lithium manganese button cell and preparation method thereof Download PDFInfo
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- CN107508004B CN107508004B CN201710825026.3A CN201710825026A CN107508004B CN 107508004 B CN107508004 B CN 107508004B CN 201710825026 A CN201710825026 A CN 201710825026A CN 107508004 B CN107508004 B CN 107508004B
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- positive electrode
- current collecting
- positive
- battery core
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- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000003792 electrolyte Substances 0.000 claims abstract description 14
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000011572 manganese Substances 0.000 claims abstract description 6
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000839 emulsion Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract 1
- 229910001416 lithium ion Inorganic materials 0.000 abstract 1
- 239000012528 membrane Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000009703 powder rolling Methods 0.000 description 1
- 238000003466 welding Methods 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
-
- 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
The invention discloses a high-power lithium manganese button cell and a preparation method thereof, belonging to the technical field of button cells. The lithium ion battery comprises a positive electrode cover (1), a negative electrode cover (2), a positive electrode sheet (6), a diaphragm (7), a negative electrode sheet (8) and electrolyte (4) which are arranged in a sealed cavity formed between the positive electrode cover (1) and the negative electrode cover (2); the negative electrode plate (8) is partially or completely laid with a current collecting net (9), and the positive electrode plate (6), the diaphragm (7) and the negative electrode plate (8) with the current collecting net (9) laid on the back face are sequentially stacked to form a long strip-shaped battery core and then folded to form a rectangular battery core (3) matched with the sealed cavity; one side of the rectangular battery core (3) close to the positive electrode cover (1) is provided with a positive electrode sheet (6), and the other side of the rectangular battery core is provided with a negative electrode sheet (8) laid with a current collecting net (9); the positive plate (6) is a manganese electrode produced by a wet method, folds (10) are formed in the folding positions, and the inner side of the positive plate cover (1) is provided with a current collecting plate (5) matched with the rectangular battery core (3).
Description
Technical Field
The invention belongs to the technical field of button cells, and particularly relates to a high-power lithium-manganese button cell and a preparation method thereof.
Background
In recent years, electronic products are rapidly developed, the products are diversified, the application fields are wider and wider, a plurality of electronic products are convenient for customers to use, high requirements are put on the capacity, the volume and the output power of used batteries, the portable trend is being developed, and the development of new ultra-high power batteries is imperative for meeting the market demands. The button cell in the current market has small continuous discharge current and low output power; the soft package battery cannot meet the market demand because of the factors of overlarge volume, poor mechanical strength, low safety and the like. Therefore, there is a need to develop an ultra-high power lithium manganese button cell to replace the conventional button cell and pouch cell, thereby solving the above-mentioned problems. The invention develops a novel ultra-high power lithium manganese button cell, under the condition of not affecting the whole size of the button cell, the positive plate, the negative plate and the diaphragm are changed into a folding type, partial structures are added, and a special folding mode is adopted, so that the cell still has more active substances in a small space, and the reaction in the cell can be normally carried out, thereby improving the output power while ensuring the capacity of the cell.
Disclosure of Invention
The invention aims to provide a high-power lithium manganese button cell, which can combine the advantages of a button cell and a soft package cell by changing a positive plate, a negative plate and a diaphragm into a folding type, adding a part of structures and adopting a special folding mode; the battery not only solves the problem that the volume of the conventional soft-pack battery is overlarge, but also solves the problems of small discharge current and insufficient output power of the traditional button battery. The second object of the present invention is to provide a method for preparing the high-power lithium manganese button cell; the technical scheme is as follows:
on one hand, the embodiment of the invention provides a high-power lithium manganese button cell, which comprises a positive electrode cover 1, a negative electrode cover 2, a positive electrode plate 6, a diaphragm 7, a negative electrode plate 8 and electrolyte 4, wherein the positive electrode plate 6, the diaphragm 7, the negative electrode plate 8 and the electrolyte 4 are arranged in a sealed cavity formed between the positive electrode cover 1 and the negative electrode cover 2; the negative electrode plate 8 is partially or completely laid with a current collecting net 9, and the positive electrode plate 6, the diaphragm 7 and the negative electrode plate 8 with the current collecting net 9 laid on the back surface are sequentially stacked to form a long strip-shaped battery core and then folded to form a rectangular battery core 3 matched with the sealed cavity; the rectangular battery core 3 is arranged in the sealed cavity, one side of the rectangular battery core, which is close to the positive electrode cover 1, is provided with a positive electrode sheet 6, and the other side of the rectangular battery core is provided with a negative electrode sheet 8 on which a current collecting net 9 is laid; the positive plate 6 is a manganese electrode produced by a wet method, folds 10 are formed at folding positions, and the inner side of the positive cover 1 is provided with a current collecting plate 5 matched with one side of the rectangular battery core 3.
The button cell in the embodiment of the invention is round, the rectangular cell core 3 is square, and four corners of the rectangular cell core are propped against the inner wall of the sealing cavity or are positioned on the adjacent inner side of the inner wall of the sealing cavity.
Specifically, the positive electrode sheet 6 in the embodiment of the present invention is rectangular, has a thickness of 0.20mm to 0.40mm, and is divided into 2 by the crease 10 of a predetermined width n+1 +1 square sub positive electrode pieces 11.
Further, the positive electrode sheet 6 in the embodiment of the invention is obtained by roll forming by using manganese dioxide, graphite and polytetrafluoroethylene emulsion as raw materials and ethanol as a solvent through a roll press, and the crease 10 is printed by a laser printer.
Specifically, the diaphragm 7 in the embodiment of the invention is rectangular, the material is fiber, and the thickness is 0.06mm-0.15mm.
Specifically, the negative electrode sheet 8 in the embodiment of the invention is rectangular, the material of the negative electrode sheet is lithium, and the thickness of the negative electrode sheet is 0.08mm-0.15mm.
Specifically, in the embodiment of the present invention, the current collecting net 9 is made of copper, the current collecting sheet 5 is made of the same material as the positive electrode cover 1 and welded on the inner side of the positive electrode cover 1, one side of the rectangular battery core 3, which is close to the positive electrode cover 1, is a sub positive electrode sheet 11, and the current collecting sheet 5 is in contact with the sub positive electrode sheet 11 in a matching manner.
Specifically, the strip-shaped battery core in the embodiment of the invention is pressed by 2 n +1: 2 n The positive plate 11 is folded forward by the fold 10 to cover the current collecting net 9, the cell core of the overlapped part is folded forward by the fold 10 n times until one side is the positive electrode of the cell core formed by the single positive plate 11, and the non-overlapped part is folded backward by the fold 10 to form the negative electrode of the cell core.
On the other hand, the embodiment of the invention also provides a preparation method of the battery, which comprises the following steps:
the current collecting net 9 is laid on the back surface of the negative electrode plate 8, the positive electrode plate 6, the diaphragm 7 and the negative electrode plate 8 laid with the current collecting net 9 are sequentially stacked to form a strip-shaped battery core, then the strip-shaped battery core is folded to form the rectangular battery core 3, the rectangular battery core 3 is installed in a sealed cavity formed by the negative electrode cover 2 and the positive electrode cover 1, one side of the positive electrode plate 6 is contacted with the positive electrode cover 1 provided with the current collecting plate 5, one side of the negative electrode plate 8 laid with the current collecting net 9 is contacted with the negative electrode cover 2, and meanwhile, the electrolyte 4 is filled in the sealed cavity.
Specifically, the method preparation includes:
(1) Preparing the positive plate 6 by a wet method, and printing crease 10 with a preset width on the corresponding position of the positive plate 6 to divide the positive plate 6 into square 2 with the same size n+1 +1 positive electrode sheets 11;
(2) Preparing a negative plate 8, a diaphragm 7 and a current collecting net 9 which are matched with the length and the width of the positive plate 6;
(3) On the reverse side 2 of the positive plate 6 n A current collecting net 9 is laid on the positive plate 11 of the +1 piece;
(4) Aligning and stacking the positive electrode plate 6, the diaphragm 7 and the negative electrode plate 8 with the current collecting net 9 laid on the back surface to form a long strip-shaped battery core, wherein the diaphragm 7 extends out of the periphery of the long strip-shaped battery core;
(5) Pressing the strip-shaped battery core to 2 n +1: 2 n The positive plate 11 is folded forward by the crease 10 to cover the current collecting net 9;
(6) The battery core of the overlapped part is folded forward for n times by using the crease 10 until one side of the battery core is a single-piece positive plate 11 to form the positive electrode of the battery core, and the non-overlapped part is folded reversely by using the crease 10 to form the negative electrode of the battery core;
(7) Trimming the diaphragm 7 extending out of the folded battery core obtained in the step (6), and then installing the trimmed diaphragm in a sealed cavity formed by the negative electrode cover 2 and the positive electrode cover 1, and filling electrolyte 4; one side of the folded battery core is a single-piece positive plate 11 and is in contact with the positive electrode cover 1 welded with the current collecting plate 5, and the other side of the folded battery core is a negative electrode plate 8 laid with the current collecting net 9 and is in contact with the negative electrode cover 2.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a high-power lithium manganese button cell and a preparation method thereof, which are characterized in that an easily-folded positive plate, a easily-folded negative plate and a easily-folded diaphragm are designed, so that more active substances can be contained in the cell in the existing volume, the folded positive plate, the folded negative plate and the folded diaphragm form a whole during assembly, the folded positive plate, the folded negative plate and the folded diaphragm are integrated with a negative plate cover, electrolyte is injected into the integrated body, and the positive plate cover is covered, so that the whole assembly process is completed. On the other hand, compared with the traditional soft-package battery, the button battery manufactured by the process has higher mechanical strength, good safety performance and more flexible design size, and can meet the demands of a plurality of customers; compared with the common button cell, the novel ultrahigh-power button cell produced by folding the anode, the cathode and the diaphragm not only improves the electrical property of the cell and improves the output power of the cell, but also expands the application range of the cell.
Drawings
Fig. 1 is a schematic structural diagram of a high-power lithium manganese button cell according to an embodiment of the present invention;
fig. 2 is a partial enlarged view of a high power lithium manganese button cell provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a rectangular battery core and sealed cavity combination provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a positive plate according to an embodiment of the present invention;
fig. 5 is a schematic view showing the structure of the rectangular battery cell in embodiment 2 when it is first folded;
fig. 6 is a schematic view showing the structure of the rectangular battery cell in embodiment 2 in a second folding;
fig. 7 is a schematic view showing the structure of the third folding of the rectangular battery cell in embodiment 2;
fig. 8 is a schematic view showing the structure of the rectangular battery cell in embodiment 3 when it is first folded;
fig. 9 is a schematic view showing the structure of the rectangular battery cell in embodiment 3 in a second folding;
fig. 10 is a schematic view showing the structure of the third folding of the rectangular battery cell in embodiment 3;
fig. 11 is a schematic structural view of the fourth folding of the rectangular battery cell in embodiment 3;
FIG. 12 is a graph of pulse discharge for a conventional coin cell;
fig. 13 is a pulse discharge graph of a coin cell provided by an embodiment of the present invention.
In the figure: the positive electrode plate comprises a positive electrode cover 1, a negative electrode cover 2, a rectangular battery core 3, electrolyte 4, a current collecting plate 5, a positive electrode plate 6, a diaphragm 7, a negative electrode plate 8, a current collecting net 9, folds 10 and a sub positive electrode plate 11.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Referring to fig. 1 to 11, an embodiment of the present invention provides a high power lithium manganese button cell, which includes a positive electrode cap 1, a negative electrode cap 2, and a positive electrode sheet 6, a separator 7, a negative electrode sheet 8, an electrolyte 4, etc. disposed in a sealed cavity formed between the positive electrode cap 1 and the negative electrode cap 2. The structure is basically the same as the existing button cell, and the difference is that: the current collecting net 9 is partially or fully laid on the back surface of the negative electrode sheet 8 in this embodiment, and preferably, a part of the current collecting net 9 can not only improve the conductivity of the negative electrode sheet 8 to ensure that the reaction proceeds, but also make the negative electrode sheet 8 flexible so as to be convenient for folding. The positive plate 6, the diaphragm 7 and the negative plate 8 with the current collecting net 9 laid on the back face are sequentially stacked to form a long strip-shaped battery core, then the long strip-shaped battery core is folded (the contact faces after each folding are required to be identical in polarity, the polarities of the two sides after each folding are completely opposite, each folding alignment enables the rectangular battery core 3 to be of a cuboid structure) to form the rectangular battery core 3 matched with the sealing cavity, the diaphragm 7 is arranged on the front face of the negative plate 8, and the lengths and the widths of the positive plate 6, the diaphragm 7 and the negative plate 8 are mutually matched. The rectangular battery cell 3 is disposed in a sealed cavity (the sealed cavity is filled to the greatest extent to increase active substances), one side (the upper surface as shown in fig. 1, which is the positive electrode of the battery cell) of the rectangular battery cell, which is close to the positive electrode cover 1, is a positive electrode sheet 6, the other side (the lower surface as shown in fig. 1, which is the negative electrode of the battery cell) is a negative electrode sheet 8 on which a current collecting net 9 is laid, and the current collecting net 9 is in contact with the negative electrode cover 2. The positive plate 6 is a manganese electrode produced by a wet method, folds 10 are formed at the folding positions, the manganese electrode produced by the wet method is matched with the current collecting net, so that the manganese electrode is flexible and convenient to fold, the positive plate 6 is further folded by the folds (the separator 7, the negative plate 8 and the current collecting net 9 all have certain ductility, and the folds are not required to be formed). The inside of the positive electrode cover 1 is provided with a current collecting sheet 5 matched with one side of the rectangular battery cell 3 for improving the conductivity, which is specifically a rectangular sheet matched with the positive electrode side of the rectangular battery cell 3. Electrolyte 4 is filled between the rectangular battery core 3 and the sealing cavity.
Referring to fig. 1 to 3, in the embodiment of the present invention, the button cell is circular, that is, the positive electrode cap 1 and the negative electrode cap 2 are both circular, and the material thereof may be SUS430. The rectangular battery cell 3 is square (of course, it may also be rectangular with unequal length and width, and correspondingly the sub-positive plate 11 is a rectangular plate with unequal length and width) and its four corners are propped against the inner wall of the sealed cavity or are located adjacent to the inner side of the inner wall of the sealed cavity to maximally fill the sealed cavity.
Specifically, referring to fig. 4, the positive electrode sheet 6 in the embodiment of the present invention is rectangular, has a thin thickness so that it is convenient to fold, has a thickness of specifically 0.20mm to 0.40mm, and is folded by folds 10 (number of 2 n ) Divided into 2 n+1 +1 square sub positive plates 11 with the same size, each layer of the rectangular battery core 3 comprises one sub positive plate 11, and the length of the sub positive plate 11 is slightly more than 2 n Total length of +1 sub positive plate 11. Wherein n is an integer greater than or equal to zero.
Further, the positive electrode sheet 6 in the embodiment of the invention is obtained by rolling and forming with a roller by taking manganese dioxide, graphite, polytetrafluoroethylene emulsion and the like as raw materials and ethanol as a solvent (the powder has certain viscosity), and the crease 10 is printed by a laser printer, wherein the crease 10 is perpendicular to the length direction of the positive electrode sheet 6.
Specifically, the separator 7 in the embodiment of the present invention is rectangular, and is made of fiber, and is required to have the characteristics of high mechanical strength, high liquid absorption, low resistivity, and the like. Meanwhile, the thickness of the membrane 7 is required to be thinner so as to facilitate folding, the thickness is particularly 0.06mm-0.15mm, the width of the membrane is larger than that of the positive plate 6, the length of the membrane is larger than that of the positive plate 6, the membrane 7 extends out of the periphery of the rectangular battery core 3 to prevent the short circuit between the positive plate and the negative plate when the membrane is folded, and the membrane 7 extending out of the battery core is trimmed when the membrane is assembled.
Specifically, the negative electrode sheet 8 in the embodiment of the invention is rectangular, is made of lithium, has a thinner thickness so as to be convenient to fold, has a thickness of specifically 0.08mm-0.15mm, has a width slightly equal to the width of the positive electrode sheet 6, and has a length slightly equal to the length of the positive electrode sheet 6.
Specifically, the current collecting net 9 in the embodiment of the invention is made of copper or alloy thereof, and has a very thin thickness so as to be conveniently laid on the negative electrode plate 8, a thickness of 0.01-0.04mm, a specific structure of mesh or grid, and the like, a width slightly smaller than the width of the positive electrode plate 6, a length of 1/2-2/3 the length of the positive electrode plate 6, and a preferable length capable of covering 2 n +1 positive electrode sheet 11. The material of the current collecting plate 5 is the same as or similar to that of the positive electrode cover 1 and weldedThe tab (spot welding) is on the inside of the positive electrode cap 1, and its thickness is thin, specifically 0.1-0.2mm. One side of the rectangular battery core 3, which is close to the positive electrode cover 1, is provided with a piece of sub positive electrode piece 11, and the size of the current collecting piece 5 can be the same as that of the sub positive electrode piece 11, so that the current collecting piece 5 is in fit contact with the piece of sub positive electrode piece 11.
Specifically, the strip-shaped battery core in the embodiment of the invention is pressed by 2 n +1: 2 n The positive sheet 11 is folded once with the corresponding fold 10 in the forward direction (the embodiment designates the folding direction of the current collecting net 9 to be covered as the forward direction, and vice versa as the reverse folding) to cover the current collecting net 9 (part of) at one time, in particular the cover 2 n A piece of positive plate 11, wherein the piece of positive plate 11 cannot be covered; overlapping parts (i.e. covered parts, in particular 2 n The sheet positive electrode sheet 11) is folded forward n times with the corresponding fold 10 to one side to form the positive electrode of the battery for the single sheet positive electrode sheet 11 (in contact with the current collecting sheet 5 of the positive electrode cover 1) and the non-overlapping portion (the sheet positive electrode sheet 11) is folded back with the corresponding fold 10 to form the negative electrode of the battery (the negative electrode sheet 8 and the current collecting net 9 thereon is in contact with the negative electrode cover 2).
The present embodiment provides a high power lithium manganese button cell, which replaces the existing "round cell" with a special "square and folded cell" and, on the one hand, folds a cell having a certain length a plurality of times and then reassembles the cell, thus enabling sufficient active material inside the cell, thereby securing the capacity of the cell. On the other hand, compared with the traditional soft package battery, the battery has wide use temperature range and high mechanical strength; compared with the common button cell, the continuous discharge current of the button cell is greatly improved, so that the output power of the battery is improved, and the application range of the button cell is greatly widened.
Example 2
Example 2 discloses a button cell of CR3032 specification on the basis of example 1, the composition of the cell of which is shown in table 1:
TABLE 1
The positive plate is composed of five sub positive plates, the single plate size is 18mm x 18mm, and folds between the five plates are 0.03mm, 0.09mm, 0.18mm and 0.03mm respectively. The folding process is shown in fig. 5-7, wherein the folding process is upward folded into forward folding, the downward folding process is reverse folding, and the folding process is three times, five layers are formed, and each layer is a piece of positive plate.
The size of the button cell in this embodiment is the same as that of the conventional CR 3032; specifically, the outer diameter thereof was 29.98mm, and the thickness thereof was 2.52mm.
The performance parameters of the button cell in this example were verified as follows
1. Output voltage contrast test:
TABLE 2
In table 2, voltage comparison between the button cell provided in this embodiment and the existing button cell with the same size under the conditions of 300 Ω and 150 Ω loads shows that the CR3032 battery provided in this embodiment has obvious advantages, and the 150 Ω load voltage can be stabilized above 3.0V, so that the power performance is better.
2. Gradient constant-current discharge capacity test and comparison:
rapid constant current step discharge conditions: namely, constant-current continuous discharge is carried out at the temperature of 20+/-2 ℃ and the relative humidity of 35% -75%: continuously discharging the load of 45mA to 2.0V, and resting for 3h; the load is continuously discharged at 22mA to 2.0V, and the rest is carried out for 3 hours; the load is continuously discharged at 11mA to 2.0V, and the rest is carried out for 3 hours; continuously discharging the load of 5mA to 2.0V, and resting for 3h; the load is continuously discharged to 2.0V at 1 mA; the results are shown in tables 3 and 4:
TABLE 3 Table 3
TABLE 4 Table 4
As is clear from tables 3 and 4, the conventional battery was easily polarized under a large current discharge of 45mA and 22mA, and did not discharge much capacity at all, indirectly reflecting the poor power performance. The CR3032 battery provided in this embodiment can also discharge 50% of the total capacity under a large current discharge of 45mA, and has better power performance. The battery provided by the embodiment is also improved relative to the existing battery in terms of total power.
3. Maximum pulse current test comparison:
test conditions: the result of the conventional CR3032 battery is shown in FIG. 12, and the result of the CR3032 battery provided in this example is shown in FIG. 13 when the 100mA is put for 3s and stopped for 27s and cycled to a voltage of 2.0V. In the figure, the upper curve represents a voltage curve, and the lower curve represents a current curve. From the aspect of the cycle number, the cycle number of the CR3032 battery provided in the embodiment is obviously higher than that of the existing CR3032 battery, the maximum pulse current of the existing battery can reach 110mA, and the maximum pulse current of the existing battery is only 25mA, which fully indicates that the power performance of the CR3032 battery provided in the embodiment is better.
The embodiment specifically provides a manufacturing process and performance test of the button cell with the CR3032 standard, and test results show that the button cell provided by the embodiment has the advantages of higher and more stable output voltage, higher output power, longer service life, larger pulse current and the like.
Example 3
Example 3 discloses a button cell of CR2450 specification on the basis of example 1, the composition of the cell of which is shown in table 5:
TABLE 5
The positive plate is composed of nine sub positive plates, and the single plate size is 14mm x 14mm. The folding process is shown in fig. 8-11, wherein the upward folding is forward folding, the downward folding is reverse folding, and the total folding is 4 times, and nine layers are all formed; the overall dimension of the battery is as follows: the diameter is 24.47-24.50mm, and the height is 5.0-5.2mm.
Example 4
Example 4 provides a method of making the batteries disclosed in examples 1-3, see fig. 1-11, comprising:
the current collecting net 9 (preferably, part) is laid on the back surface of the negative electrode plate 8, the positive electrode plate 6, the diaphragm 7 and the negative electrode plate 8 with the current collecting net 9 laid on the back surface are sequentially stacked to form a long strip-shaped battery core, then the long strip-shaped battery core is folded to form the rectangular battery core 3, the diaphragm 7 is stacked on the front surface of the negative electrode plate 8, the rectangular battery core 3 is arranged in a sealed cavity formed by the negative electrode cover 2 and the positive electrode cover 1, one side of the positive electrode plate 6 (positive electrode of the battery core) is contacted with the positive electrode cover 1 provided with the current collecting plate 5, one side of the negative electrode plate 8 (negative electrode of the battery core) with the current collecting net 9 laid thereon is contacted with the negative electrode cover 2, and meanwhile, the electrolyte 4 is filled in the sealed cavity.
Specifically, the method preparation includes:
(1) The positive electrode sheet 6 was prepared by a wet method, and creases 10 (number 2 n ) Dividing the positive electrode sheet 6 into square-shaped sections 2 of the same size n+1 +1 positive electrode sheet 11. The wet method is corresponding to the conventional dry method, and takes conventional manganese dioxide, graphite, polytetrafluoroethylene emulsion and the like as raw materials, wherein alcohol is mainly added in the aspect of the conventional positive electrode manufacturing process, so that powder has certain viscosity, the whole material can be integrated, the molding is convenient, and the process uses a rolling machine to roll out the positive electrode plate, so that the positive electrode plate has flexibility after being screened, and is convenient to fold. This makes the "and powder granulation" link become "and powder rolling tablet", so called wet process.
(2) Preparing a negative plate 8, a diaphragm 7 and a current collecting net 9 which are matched with the length and the width of the positive plate 6, wherein the negative plate 8, the diaphragm 7 and the current collecting net 9 are rectangular, the length and the width of the negative plate 8 are basically equal to those of the positive plate 6, the length and the width of the diaphragm 7 are larger than those of the positive plate 6, and the length and the width of the current collecting net 9 are smaller than those of the positive plate 6 (specific lengthThe degree is slightly more than 2 n Total length of +1 sub positive electrode sheet 11).
(3) On the reverse side of the positive plate 6 is continuously 2 n And a current collecting net 9 is laid on the +1 sub positive plate 11, and the current collecting net 9 is mostly covered by the other side preliminary folding.
(4) The positive plate 6, the diaphragm 7 and the negative plate 8 with the current collecting net 9 laid on the back face are aligned and sequentially stacked to form a strip-shaped battery core, and in order to ensure the insulating effect of the diaphragm 7, the diaphragm 7 extends out of the periphery of the strip-shaped battery core.
(5) Pressing the strip-shaped battery core to 2 n +1: 2 n The sheet positive electrode sheet 11 is folded forward by the corresponding crease 10 to partially cover the current collecting net 9, and a sheet of the sheet positive electrode sheet 11 with the current collecting net 9 is exposed.
(6) Will overlap (covered 2 n The positive electrode sheet 11) is folded forward for n times to form the positive electrode of the battery core by the corresponding crease 10, and the non-overlapped part (the exposed positive electrode sheet 11 with the current collecting net 9) is folded reversely by the corresponding crease 10 to form the negative electrode of the battery core, and the positive electrode sheet 11 with the current collecting net 9 is exposed.
(7) And (3) trimming the diaphragm 7 extending out of the folded battery core obtained in the step (6), and then installing the trimmed diaphragm in a sealed cavity formed by the negative electrode cover 2 and the positive electrode cover 1, and filling electrolyte 4. One side (positive electrode) of the folded battery core is a single-piece positive electrode plate 11 and is contacted with the positive electrode cover 1 welded with the current collecting plate 5, the other side (negative electrode) of the folded battery core is a negative electrode plate 8 laid with the current collecting net 9, and the current collecting net 9 on the folded battery core is contacted with the negative electrode cover 2.
The embodiment provides a preparation method of a high-power lithium manganese button cell, which combines the button cell and a soft package cell, adopts special preparation technology and treatment through a positive plate, lays a current collecting net, adaptively adjusts a negative plate, a diaphragm and the like, adopts a special folding mode to enable a superposed cell core to be easy to fold, and has more excellent performance compared with the existing cell core.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A high-power lithium manganese button cell comprises a positive electrode cover (1), a negative electrode cover (2), a positive electrode sheet (6), a diaphragm (7), a negative electrode sheet (8) and electrolyte (4) which are arranged in a sealed cavity formed between the positive electrode cover (1) and the negative electrode cover (2); the solar cell is characterized in that a current collecting net (9) is partially or completely laid on the back surface of the negative electrode plate (8), and the positive electrode plate (6), the diaphragm (7) and the negative electrode plate (8) with the current collecting net (9) laid on the back surface are sequentially stacked to form a strip-shaped cell core and then folded to form a rectangular cell core (3) matched with the sealed cavity; the rectangular battery core (3) is arranged in the sealed cavity, one side of the rectangular battery core, which is close to the positive electrode cover (1), is provided with a positive electrode sheet (6), and the other side of the rectangular battery core is provided with a negative electrode sheet (8) on which a current collecting net (9) is laid; the positive plate (6) is a manganese electrode produced by a wet method, folds (10) are formed in the folding positions, and a current collecting plate (5) matched with one side of the rectangular battery core (3) is arranged on the inner side of the positive cover (1).
2. The high-power lithium manganese button cell according to claim 1, characterized in that the button cell is circular, the rectangular cell (3) is square and its four corners rest against or are located adjacent to the inner wall of the sealed cavity.
3. The high power lithium manganese button cell according to claim 2, characterized in that the positive plate (6) is rectangular with a thickness of 0.20mm-0.40mm, separated by a crease (10) of predetermined width of 2 n+1 +1 square sub positive plates (11).
4. A high power lithium manganese button cell according to claim 3, characterized in that the positive electrode sheet (6) is obtained by roll forming with a roll mill using manganese dioxide, graphite and polytetrafluoroethylene emulsion as raw materials and ethanol as solvent, and by printing folds (10) with a laser printer.
5. The high-power lithium manganese button cell according to claim 1, characterized in that the separator (7) is rectangular, made of fiber and has a thickness of 0.06-0.15 mm.
6. The high-power lithium-manganese button cell according to claim 1, wherein the negative electrode sheet (8) is rectangular, is made of lithium, and has a thickness of 0.08-0.15 mm.
7. The high-power lithium manganese button cell according to claim 3, wherein the current collecting net (9) is made of copper, the current collecting sheet (5) is made of the same material as the positive electrode cover (1) and welded on the inner side of the positive electrode cover (1), one side, close to the positive electrode cover (1), of the rectangular cell core (3) is provided with a sub positive electrode sheet (11), and the current collecting sheet (5) is in matched contact with the sub positive electrode sheet (11).
8. The high power lithium manganese button cell of claim 7 wherein said elongated cell is according to 2 n +1: 2 n The positive plate (11) is folded forward by the crease (10) to cover the current collecting net (9), the cell core of the overlapped part is folded forward by the crease (10) n times until one side of the cell core is a single positive plate (11) to form the positive electrode of the cell core, and the non-overlapped part is folded reversely by the crease (10) to form the negative electrode of the cell core.
9. The method of making a high power lithium manganese button cell according to any one of claims 1-8, wherein the method comprises:
and (3) laying a current collecting net (9) on the back surface of the negative electrode plate (8), sequentially stacking the positive electrode plate (6), the diaphragm (7) and the negative electrode plate (8) laid with the current collecting net (9) to form a long strip-shaped battery core, folding the long strip-shaped battery core to form a rectangular battery core (3), installing the rectangular battery core (3) in a sealed cavity formed by the negative electrode cover (2) and the positive electrode cover (1), enabling one side of the positive electrode plate (6) to be in contact with the positive electrode cover (1) provided with the current collecting plate (5), enabling one side of the negative electrode plate (8) laid with the current collecting net (9) to be in contact with the negative electrode cover (2), and simultaneously filling electrolyte (4) in the sealed cavity.
10. The method of preparing a high power lithium manganese button cell according to claim 9, wherein the method comprises:
(1) Preparing a positive plate (6) by a wet method, and printing crease marks (10) with preset widths on corresponding positions of the positive plate (6) to divide the positive plate (6) into square 2 with the same size n+1 +1 positive electrode sheets (11);
(2) Preparing a negative plate (8), a diaphragm (7) and a current collecting net (9) which are matched with the length and the width of the positive plate (6);
(3) On the reverse side 2 of the positive plate (6) n A current collecting net (9) is laid on the positive plate (11) of the +1 piece;
(4) The positive plate (6), the diaphragm (7) and the negative plate (8) with the current collecting net (9) laid on the back face are aligned and stacked to form a strip-shaped battery core, and the diaphragm (7) extends out of the periphery of the strip-shaped battery core;
(5) Pressing the strip-shaped battery core to 2 n +1: 2 n The positive plate (11) is folded forward by a crease (10) to cover the current collecting net (9);
(6) The battery core of the overlapped part is folded forward for n times by a crease (10) until one side of the battery core is a single-piece positive plate (11) to form a positive electrode of the battery core, and the non-overlapped part is folded reversely by the crease (10) to form a negative electrode of the battery core;
(7) Trimming the diaphragm (7) extending out of the folded battery core obtained in the step (6), and then installing the trimmed diaphragm in a sealed cavity formed by the negative electrode cover (2) and the positive electrode cover (1) and filling electrolyte (4); one side of the folded battery core is a single-piece positive plate (11) and is contacted with a positive electrode cover (1) welded with a current collecting plate (5), and the other side of the folded battery core is a negative electrode plate (8) laid with a current collecting net (9) and is contacted with a negative electrode cover (2).
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