CN108461820B - High-current lithium-manganese button cell and preparation method thereof - Google Patents
High-current lithium-manganese button cell and preparation method thereof Download PDFInfo
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- CN108461820B CN108461820B CN201810126965.3A CN201810126965A CN108461820B CN 108461820 B CN108461820 B CN 108461820B CN 201810126965 A CN201810126965 A CN 201810126965A CN 108461820 B CN108461820 B CN 108461820B
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- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000007772 electrode material Substances 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052802 copper Inorganic materials 0.000 claims abstract description 31
- 239000010949 copper Substances 0.000 claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 24
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 22
- 239000011572 manganese Substances 0.000 claims abstract description 22
- 239000003792 electrolyte Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 16
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 10
- 238000007789 sealing Methods 0.000 description 6
- 238000012797 qualification Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material 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
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002699 waste material 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
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Primary Cells (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a high-current lithium-manganese button cell and a preparation method thereof, and belongs to the technical field of button cells. The battery comprises a positive electrode cover, a negative electrode cover, a battery core and electrolyte, wherein the battery core and the electrolyte are arranged in a sealed cavity formed between the positive electrode cover and the negative electrode cover; the positive plate consists of an aluminum pull net and manganese electrode materials rolled on the front surface and the back surface of the aluminum pull net, wherein the back surface of the positive plate is N sub positive plates separated by folds, and the front surface of the positive plate is 1 positive plate and N-1 continuous sub positive plates formed by the exposure of the aluminum pull net; the negative electrode plate is composed of a copper net and lithium electrode materials laid on the front surface and the back surface of the copper net, wherein the front surface is provided with 1 negative electrode formed by exposing the copper net and N-1 continuous sub-negative electrode plates, and the back surface is provided with N continuous sub-negative electrode plates; a diaphragm is arranged between the positive plate and the negative plate to separate the sub positive plate from the sub negative plate, and the sub positive plate and the sub negative plate are combined in a preset mode and then folded along folds in the same direction in sequence to form the battery cell.
Description
Technical Field
The invention belongs to the technical field of button cells, and particularly relates to a high-current lithium-manganese button cell and a preparation method thereof, wherein the battery is further improved on the basis of the patent with the application number of 201710825026.3 so as to improve the capacity and reduce the processing difficulty.
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 high-power batteries is imperative for meeting the market demands.
The patent with application number 201710825026.3 discloses a high-power lithium manganese button cell, which comprises a positive electrode cover, a negative electrode cover, a positive electrode plate, a diaphragm, a negative electrode plate and electrolyte, wherein the positive electrode plate, the diaphragm, the negative electrode plate and the electrolyte are arranged in a sealed cavity formed between the positive electrode cover and the negative electrode cover; the negative electrode plate, the diaphragm and the negative electrode plate with the current collecting net laid on the back face are sequentially stacked to form a long strip-shaped cell and then folded to form a rectangular cell matched with the sealed cavity; the rectangular battery cell is arranged in the sealed cavity, one side of the rectangular battery cell, which is close to the positive electrode cover 1, is a positive electrode plate, and the other side of the rectangular battery cell is a negative electrode plate on which a current collecting net is laid; the positive plate is a manganese electrode produced by a wet method, folds are formed in the folding positions, and a current collecting plate matched with one side of the rectangular battery cell is arranged on the inner side of the positive cover.
The applicant found the following problems in the production of the aforementioned batteries:
(1) The folding mode is complex, only manual operation is usually adopted in a drying chamber, the production efficiency is low, and automatic production is difficult to realize;
(2) On the basis of the process, if the current collecting net is added on the positive electrode material, one of the two current collecting surfaces of the positive electrode is completely exposed, the corners of the pole pieces are easy to form a powder removing phenomenon, the current collecting net is exposed, a diaphragm is easy to puncture in the assembly process, a cell is short-circuited, and the product yield is low;
(3) The above process does not increase the capacity of the battery much on the basis of increasing the output power, and if the capacity of the battery is to be increased, the volume of the battery is to be increased.
Disclosure of Invention
One of the purposes of the invention is to provide a high-current lithium manganese button cell which has larger capacity and higher output power, and the preparation mode of the cell is simpler; the second purpose of the invention is to provide a preparation method of the high-current lithium manganese button cell, which has higher product qualification rate and simple folding mode, and can not only improve the production efficiency, but also realize mechanized production; the technical scheme is as follows:
on one hand, the embodiment of the invention provides a high-current lithium manganese button cell, which comprises a positive electrode cover, a negative electrode cover, a cell and electrolyte, wherein the cell and the electrolyte are arranged in a sealed cavity formed between the positive electrode cover and the negative electrode cover, and the cell is formed by stacking and folding a positive electrode plate, a diaphragm 5 and a negative electrode plate; the positive plate and the negative plate are folded to form a 2N-1 piece positive plate and a 2N-1 piece negative plate which are matched with each other; the positive plate consists of an aluminum screen 1 and manganese electrode materials 2 rolled on the front surface and the back surface of the aluminum screen 1, wherein the back surface of the positive plate is N sub positive plates separated by folds, and the front surface of the positive plate is 1 positive plate formed by exposing the aluminum screen 1 and N-1 continuous sub positive plates; the negative electrode plate consists of a copper net 3 and lithium electrode materials 4 laid on the front side and the back side of the copper net 3, wherein the front side of the negative electrode plate is provided with 1 negative electrode formed by exposing the copper net 3 and N-1 continuous sub-negative electrode plates, and the back side of the negative electrode plate is provided with N continuous sub-negative electrode plates; and a diaphragm 5 is arranged between the positive plate and the negative plate to separate the sub positive plate from the sub negative plate, and the sub positive plate and the sub negative plate are combined in a preset mode and then folded along folds in the same direction in sequence to form the battery cell.
Specifically, the structure of the battery cell in the embodiment of the invention is as follows: the diaphragm 5 is coated outside the negative electrode plate, N pieces of the positive electrode plates at intervals are coated outside the diaphragm 5 to cover N-1 piece negative electrode plates on the front side of the negative electrode plate and 1 piece negative electrode plate on the back side far away from the negative electrode, and the 1 piece negative electrode plate on the back side far away from the negative electrode is folded reversely along folds for N-1 times to form the battery cell.
The button cell in the embodiment of the invention is round, the cell is rectangular, and four corners of the cell 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 sub positive plate in the embodiment of the invention is rectangular, the thickness of the aluminum screen 1 is 0.1-0.5mm, and the thickness of the manganese electrode material 2 is 0.1-1.0mm.
Further, the manganese electrode material 2 in the embodiment of the invention is prepared by taking manganese dioxide, graphite, acetylene black and polytetrafluoroethylene emulsion as raw materials and ethanol as a solvent, rolling the raw materials on the aluminum screen 1 by a rolling machine, and printing folds by a laser printer. Specifically, the diaphragm 5 in the embodiment of the present invention is rectangular, and its thickness is 0.01-0.40mm.
Specifically, the negative electrode sheet in the embodiment of the invention is rectangular, the lithium electrode material 4 is a strip-shaped lithium strip, and the thickness of the strip-shaped lithium strip is 0.05-0.30mm; the thickness of the copper net 3 is 0.02-0.20mm.
Preferably, the width of the negative electrode sheet in the embodiment of the invention is smaller than that of the positive electrode sheet, and the positive electrode sheet extends outwards by 0.25-0.50mm in the width direction relative to the negative electrode sheet.
Wherein, the negative electrode sheet in the embodiment of the invention is prepared from a lithium band according to the following formula of N-1: the N negative electrode plates are folded and coated outside the copper net 3 with the corresponding length of the N negative electrode plates.
On the other hand, the embodiment of the invention also provides a preparation method of the high-current lithium manganese button cell, which comprises the following steps:
(1) The manganese electrode material 2 obtained by the wet method is prepared by the following steps of: the N sub positive plates are rolled on the front side and the back side of an aluminum screen 1 with the corresponding length of the N sub positive plates to manufacture positive plates, folds with preset widths are printed on the corresponding positions of the back side of the positive plates to divide the positive plates into N sub positive plates with intervals, and the aluminum screen 1 at one end on the front side of the positive plates is exposed to form a positive plate and N-1 continuous sub positive plates;
(2) Lithium band was taken as N-1: the N negative electrode pieces are folded and coated on the front and back sides of the copper net 3 with the corresponding length of the N negative electrode pieces to form negative electrode pieces, and the copper net 3 at one end on the front side of the negative electrode pieces is exposed to form a negative electrode;
(3) Coating a diaphragm 5 outside the negative electrode sheet to cover the 2N-1 sub negative electrode sheet thereon;
(4) Covering the positive plate outside the diaphragm 5 to cover the N-1 sub negative plates on the front surface of the negative plate and the 1 sub negative plates on the back surface far away from the negative electrode with N sub positive plates at intervals on the back surface of the positive plate;
(5) Starting to reversely fold 1 piece of negative electrode plate far away from the negative electrode along the crease for N-1 times to form a battery cell;
(6) And the battery cell is arranged in a sealed cavity formed by the anode cover and the cathode cover and is filled with electrolyte, and the cathode and the anode are respectively contacted with the anode cover and the anode cover.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
(1) Under the condition of unchanged reaction area, the total length of the positive plate is shortened by more than 40%, the current collecting net of the positive plate is correspondingly reduced, and the utilization space of active substances is effectively improved, so that the total capacity of the battery is improved;
(2) The number of folds is reduced by about 1 time, the production process is simplified, and the manufacturing efficiency of the positive plate is improved;
(3) The folding mode of the battery core is changed from a folding mode between the front and back to a folding mode in the same direction, so that an automatic folding tool is convenient to design, and automatic production is facilitated;
(4) The manufacturing process of the positive plate is changed, a specific current collecting net is adopted on the positive plate and is covered by the manganese electrode material, and burrs are not easily formed by exposing the current collecting net, so that the short circuit rate of the battery cell is reduced, and the qualification rate of products is improved;
(5) The corners of the sub positive plates are provided with notches to enable the periphery of the battery cell to be chamfered, four corners of the battery cell are not easy to be bumped in the process of covering the battery cell, the qualification rate of the battery cell is improved, the size of the electrode plates and the weight of active substances can be effectively increased, the battery capacity is increased, and the output power is also improved;
(6) By adopting a special positive electrode cover design, the thickness of the battery can be reduced, and the positive electrode cover can be always and uniformly contacted and offset expansion deformation in the assembly and use processes; meanwhile, the exposed aluminum pull net can be better contacted with the positive electrode cover, and the manganese electrode material cannot be damaged.
Drawings
Fig. 1 is a schematic view of the structure of the positive electrode sheet provided in embodiment 3;
fig. 2 is a schematic structural view of a negative electrode sheet provided in embodiment 3;
fig. 3 is a schematic structural diagram of the positive electrode sheet and negative electrode sheet combination provided in embodiment 3;
fig. 4 is a schematic view of the structure of the first folding of the positive electrode sheet and the negative electrode sheet combination provided in embodiment 3;
fig. 5 is a schematic view showing a structure of a second folding of the positive electrode sheet and the negative electrode sheet combination provided in embodiment 3;
fig. 6 is a schematic structural view of the positive electrode sheet provided in embodiment 4;
fig. 7 is a schematic view of the structure of the negative electrode sheet provided in embodiment 4;
fig. 8 is a schematic view of the combination of the positive electrode sheet and the negative electrode sheet provided in embodiment 4;
fig. 9 is a schematic view of the structure of the first folding of the positive electrode sheet and the negative electrode sheet combination provided in embodiment 4;
fig. 10 is a schematic view showing a structure of a second folding of the positive electrode sheet and the negative electrode sheet combination provided in embodiment 4;
fig. 11 is a schematic view showing a structure of a third folding of the positive electrode sheet and the negative electrode sheet combination provided in embodiment 4
Fig. 12 is a front view of the positive electrode sheet provided in example 5;
fig. 13 is a back view of the positive electrode sheet provided in example 5.
In the figure: 1 aluminum mesh, 2 manganese electrode material, 3 copper mesh, 4 lithium electrode material and 5 diaphragm.
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.
Example 1
Referring to fig. 1 to 11, embodiment 1 discloses a high-current lithium manganese button cell, which comprises a positive electrode cover, a negative electrode cover, a cell and electrolyte, wherein the cell and the electrolyte are arranged in a sealed cavity formed between the positive electrode cover and the negative electrode cover, and the cell is formed by stacking a positive electrode plate, a diaphragm 5 and a negative electrode plate and then folding the positive electrode plate and the diaphragm 5. Wherein, the positive plate and the negative plate are folded to form a 2N-1 piece positive plate and a 2N-1 piece negative plate which are matched with each other; the sub positive electrode plate and the sub negative electrode plate can be rectangular plates matched with the sealing cavity. The positive plate consists of an aluminum screen 1 and manganese electrode materials 2 rolled on the front surface and the back surface of the aluminum screen 1, the back surface of the positive plate is N sub positive plates separated by folds, the front surface of the positive plate is 1 positive plate (the size is the same as that of the sub positive plates and corresponds to one sub positive plate at the end part of the back surface) formed by exposing the aluminum screen 1, and N-1 continuous sub positive plates (manganese electrode materials are arranged at the positions between adjacent sub positive plates and correspond to the folds, for example, the positive surface is uncovered in a region which can cover most of the front surface and only the end part corresponds to the size of one sub positive plate). The negative electrode sheet is composed of a copper mesh 3 and lithium electrode materials 4 laid (specifically, can be coated) on the front and back sides of the copper mesh 3, the front side of the negative electrode sheet is 1 negative electrode (a negative electrode sheet corresponding to the end of the back side) formed by exposing the copper mesh 3, the size of the negative electrode sheet is the same as that of the negative electrode sheet, the negative electrode sheet is a negative electrode sheet corresponding to the end of the back side), N-1 continuous negative electrode sheets (comprising crease widths), and the back side of the negative electrode sheet is N continuous negative electrode sheets (comprising crease widths). Further, a diaphragm 5 is arranged between the positive plate and the negative plate to separate the corresponding sub positive plate from the sub negative plate, and the sub positive plate and the sub negative plate are combined in a preset mode and then folded in the same direction along folds in a preset mode to form the battery cell. The preparation of the battery cell requires that the polarities of the contact surfaces after each folding are the same, the polarities of the two sides of the battery cell after the complete folding are opposite (one side is a bare aluminum pull net 1, the other side is a bare copper net 3), each folding is aligned to enable the rectangular battery cell to be in a cuboid structure, and a diaphragm 5 is arranged between the sub positive plate and the sub negative plate. Wherein N is an integer of 2-7, and is usually 3 or 4. The bare electrode material (preferred) may be understood as not being provided with electrode material, or may be understood as that the current collector (aluminum mesh and copper mesh) extends out of a sub-electrode length of the electrode material and then is folded to cover the electrode material at one end.
Specifically, referring to fig. 1 to 11, the structure of the battery cell in the embodiment of the present invention is: the diaphragm 5 is coated outside the negative electrode plate, N pieces of the positive electrode plate at intervals are coated outside the diaphragm 5 to cover the corresponding N-1 piece negative electrode plate on the front surface of the negative electrode plate and the 1 piece negative electrode plate on the back surface far away from the negative electrode (the diaphragm 5 is arranged between the N-1 piece positive electrode plate and the negative electrode plate), namely one end of the back surface of the positive electrode plate is aligned with one end of the front surface of the negative electrode plate, the N-1 piece positive electrode plate on one end of the back surface of the positive electrode plate covers the N-1 piece negative electrode plate on the front surface of the negative electrode plate, and one piece of the positive electrode plate on the other end of the back surface of the positive electrode plate is reversely folded (along a crease close to the end part) to cover one piece of the negative electrode plate on the back surface of the negative electrode plate. Starting from 1 piece of negative electrode plate with the back surface far away from the negative electrode, reversely folding for N-1 times along folds (from the 2 nd to the N-1 th) to form a battery cell; in fact, the first N-2 folds during the folding process are folded along the crease, and the last fold is reversed along the positive sheet end to expose the negative electrode.
The button cell in the embodiment of the invention is round, the cell is rectangular, and four corners of the cell 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 sub positive plate in the embodiment of the invention is rectangular, the thickness of the aluminum screen 1 is 0.1-0.5mm, and the thickness of the manganese electrode material 2 is 0.1-1.0mm.
Further, the manganese electrode material 2 in the embodiment of the invention is prepared by adopting manganese dioxide, graphite, acetylene black, polytetrafluoroethylene emulsion and the like as raw materials and ethanol as a solvent through a wet process, is rolled on the aluminum screen 1 through a rolling machine, and is printed with folds by a laser printer or other physical modes. Of course, the manganese electrode material 2 may be prepared by other processes mainly using manganese dioxide. Specifically, the folds are perpendicular to the positive electrode plate, the number of the folds is N-1, the width of the folds can be the same, and the folds can be gradually narrowed from the direction far away from the positive electrode.
Preferably, referring to fig. 12 and 13, in order to accommodate more active materials and increase the reaction surface of the positive electrode and the negative electrode in the circular sealed cavity formed by the battery cover, four corner chamfers (bevel angles, round angles or other shapes) of the positive electrode plate are arranged at two ends of the crease, and notches capable of being matched with the chamfers after being folded are arranged at two ends of the crease, so that each sub positive electrode plate is aligned after being folded to form a rectangular battery cell with four corner chamfers. Wherein, four corners of the positive plate are rounded (R=0.5-3.0), correspondingly, the notch isShape notch (two sections of circular arc). Specifically, in the embodiment, the four corners of the positive plate are beveled, and correspondingly, the notch is a V-shaped notch.
Specifically, the separator 5 in the embodiment of the present invention is rectangular, and is made of special fibers (which are required to have high mechanical strength, high liquid absorption, low resistivity, etc.), and has a thickness of 0.01-0.40mm.
Specifically, the negative plate in the embodiment of the invention is rectangular, the lithium electrode material 4 is a strip-shaped lithium strip, and the thickness of the strip-shaped lithium strip is 0.05-0.30mm; the thickness of the copper net 3 is 0.02-0.20mm.
Preferably, the width of the negative electrode sheet in the embodiment of the invention is smaller than that of the positive electrode sheet, and the positive electrode sheet extends outwards by 0.25-0.50mm in the width direction relative to the negative electrode sheet. In the manufacturing process of the battery, the negative plate and the positive plate are difficult to be completely overlapped, so that waste is caused by the non-overlapped part, and the reduction of the width of the negative plate is cost-saving. On the other hand, lithium in the negative electrode plate can react in the discharging process of the negative electrode material, so that lithium ions can be gradually embedded into the manganese material crystal form of the positive electrode plate.
Further, the width of the lithium strip corresponds to the copper mesh 3 (the width of the copper mesh 3 may be slightly smaller than the width of the lithium strip), and the width of the separator 5 may be larger than the widths of the positive electrode sheet and the negative electrode sheet.
The negative plate in the embodiment of the invention can be formed by folding a lithium strip on the front and back sides of the copper mesh 3; specifically, a lithium band is used as the following formula N-1: the N sub negative plates (plus the width of the corresponding crease) are folded and coated outside the copper net 3 with the corresponding length (plus the width of the corresponding crease) of the N sub negative plates, and one end of the N sub negative plates is exposed to form a negative electrode.
Preferably, the positive electrode cover of the invention is provided with the convex table (forming the groove) which is inwards (towards the battery core) convex and can deform outwards after being extruded and provide a resilience force for prohibiting deformation, and a plurality of inwards (towards the battery core) convex points are uniformly distributed on the convex table. Further, the boss and the convex point are obtained by one-step stamping molding when the positive electrode cover is manufactured.
The embodiment provides a high-current lithium manganese button cell, which has larger capacity and output power, and the preparation mode of the cell is simpler.
Example 2
Referring to fig. 1 to 13, example 2 provides a method for preparing the high-current lithium manganese button cell, which comprises the following steps:
(1) The manganese electrode material obtained by the wet method is prepared according to the following formula of N-1: the N pieces of positive plates are rolled on the front and back sides of an aluminum pull net 1 with the corresponding length (the width of corresponding folds) of the N pieces of positive plates through a rolling machine to manufacture positive plates, folds with the preset width are printed on the corresponding positions of the back sides of the positive plates to divide the positive plates into N pieces of spaced positive plates, and the aluminum pull net 1 at one end (the other positions of the positive plates are covered with a manganese electrode material 2) of the front sides of the positive plates is exposed to form the positive plates and N-1 continuous positive plates. Specifically, the positive plate can be formed by slicing a large piece of aluminum screen 1 covered with manganese electrode materials, and chamfering and notch are cut in the slicing process.
(2) One lithium band (length of 2N-1 piece of negative electrode piece corresponds to length) was prepared according to the following formula N-1: the N sub negative plates (plus the width of the corresponding crease) are folded and coated on the front and back sides of the copper net 3 with the corresponding length (plus the width of the corresponding crease) of the N sub negative plates to form the negative plates, the copper net 3 at one end on the front of the negative plates is exposed to form a negative electrode and N-1 continuous sub negative plates, and the back side is the N continuous sub negative plates.
(3) The membrane 5 is coated outside the negative electrode plate to cover the 2N-1 sub-negative electrode plate thereon, and the membrane 5 can extend to the periphery to ensure the isolation effect.
(4) And the positive plate is covered outside the diaphragm 5, so that N sub positive plates (contacted with the diaphragm 5) at intervals on the back surface of the positive plate cover the N-1 sub negative plates on the front surface of the negative plate and the 1 sub negative plates on the back surface far away from the negative plate. The positive plate can be reversely folded along the crease close to the end part according to the ratio of N-1:1 in advance, and then the sub positive plate on the back surface of the positive plate is aligned with the sub negative plate on the front surface of the negative plate and is partially coated.
(5) Starting from 1 piece of negative electrode plate with the back surface far away from the negative electrode, reversely folding the negative electrode plate along crease lines (from the 2 nd to the N-1 th) for N-1 times along the same direction manually or mechanically to form a battery cell; specifically, the first N-2 folds are folded along the crease, and the last fold is reversed along the end of the positive sheet (the end near the positive electrode) to expose the negative electrode.
The cell can be punched on the negative cap by a punch (while detecting whether a short circuit occurs).
Wherein steps (2) - (5) may be performed in a dry sealed chamber.
(6) And mounting the battery cell in a sealed cavity formed by the anode cover and the cathode cover, filling electrolyte, sealing, and respectively contacting the anode and the cathode of the battery cell with the anode cover and the cathode cover.
The invention provides a preparation method of a high-current lithium manganese button cell, which has higher product qualification rate, simple folding mode, and can not only improve the production efficiency, but also realize mechanical automatic production.
Example 3
Referring to fig. 1-5, in this embodiment, N is 3, the battery model is CR3832, the diameter of the battery is 37.97-38.00mm, the thickness is 3.2-3.3mm, the single piece positive plate is 21-23mm long by 23-24mm wide, the thickness (mesh-free part) of the positive plate is 0.60-0.65mm, the total length of the positive plate is 70-73mm, the crease width is 2-3mm, the back surface is provided with 3 piece positive plates at intervals, and the exposed aluminum mesh is 23-24mm long by 23-24mm wide.
The total length of the diaphragm is 165-175mm, the width is 25-27mm, and the thickness is 0.1mm; the total length of the lithium belt is 160-170mm, the width is 22.5-23.0mm, and the thickness is 0.11mm; the length of the copper net is 93-96mm, the width is 21-22mm, and the thickness is 0.06mm.
The combination and folding were the same as in example 2.
The battery obtained in this example was compared with the battery of patent application CN201710825026.3, and the results are as follows:
1. output voltage contrast test
TABLE 1
In table 1, the voltage of the button cell provided in this embodiment is compared with the voltage of the button cell provided in CN201710825026.3 under the conditions of 390 Ω and 39 Ω loads, and it can be seen from table 1 that the load voltages of the CR3832 cell provided in this embodiment and the CR3832 cell provided in CN201710825026.3 are equivalent, that is, the reduction of the positive current collecting network and the change of the folding mode can also meet the requirements of customers in terms of functionality.
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%: the load is 75mA to continuously discharge to 2.3V, and the rest is carried out for 3 hours; the load is 35mA to continuously discharge to 2.3V, and the rest is carried out for 3 hours; continuously discharging the load of 5mA to 2.3V, and resting for 3h; continuously discharging the load of 3mA to 2.3V, and resting for 3h; the load is 1.8mA and continuously discharges to 2.0V; the results are shown in tables 2 and 3:
TABLE 2
TABLE 3 Table 3
As can be seen from tables 2 and 3, the 75mA and 35mA high current discharge capacities of the two batteries were substantially identical and the power was substantially identical. However, the total capacity of the CR3832 battery provided in this example was higher than that of the battery of patent CN201710825026.3 by more than 5%. The battery provided by this embodiment is significantly improved over the battery of patent CN201710825026.3 in terms of total capacity. Therefore, the battery in this embodiment ensures high power while also ensuring high capacity.
Example 4
Referring to fig. 6 to 11, N in this embodiment is 5, and the combination and folding are the same as in embodiment 2.
Example 5
Referring to fig. 12 and 13, N in the present embodiment is 3, and the combination and folding are the same as those of embodiment 3, except that: four corners of the positive plate are rounded (R=2), and the notch isAnd a notch is formed. The battery in this example was tested for a large increase in both power and capacity over the battery of patent CN 201710825026.3.
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. The high-current lithium manganese button cell comprises a positive electrode cover, a negative electrode cover, a cell and electrolyte, wherein the cell and the electrolyte are arranged in a sealed cavity formed between the positive electrode cover and the negative electrode cover, and the cell is formed by stacking and folding a positive electrode plate, a diaphragm (5) and a negative electrode plate; it is characterized in that the method comprises the steps of,
the positive plate and the negative plate are folded to form a 2N-1 piece positive plate and a 2N-1 piece negative plate which are matched with each other;
the positive plate consists of an aluminum pull net (1) and manganese electrode materials (2) rolled on the front side and the back side of the aluminum pull net (1), the back side of the positive plate is N sub positive plates separated by folds, and the front side of the positive plate is 1 positive plate formed by exposing the aluminum pull net (1) and N-1 continuous sub positive plates;
the negative electrode plate consists of a copper net (3) and lithium electrode materials (4) laid on the front surface and the back surface of the copper net (3), wherein the front surface is provided with 1 negative electrode formed by exposing the copper net (3) and N-1 continuous sub-negative electrode plates, and the back surface is provided with N continuous sub-negative electrode plates;
a diaphragm (5) is arranged between the positive plate and the negative plate to separate the sub positive plate from the sub negative plate, and the sub positive plate and the sub negative plate are combined in a preset mode and then folded along folds in the same direction in sequence to form the battery cell.
2. The high current lithium manganese button cell according to claim 1, wherein the cell is structured as:
the diaphragm (5) is coated outside the negative electrode plate, N pieces of the positive electrode plates at intervals are coated outside the diaphragm (5) to cover N-1 pieces of negative electrode plates on the front side of the negative electrode plate and 1 piece of negative electrode plates on the back side far away from the negative electrode, and the 1 piece of negative electrode plates on the back side far away from the negative electrode are reversely folded for N-1 times along folds to form the battery cell.
3. The high current lithium manganese coin cell of claim 1 wherein the coin cell is circular, the cell is rectangular and its four corners rest against or are adjacent to the inside wall of the sealed cavity.
4. The high-current lithium-manganese button cell according to claim 3, wherein the sub positive electrode sheet is rectangular, the thickness of the aluminum trawl (1) is 0.1-0.5mm, and the thickness of the manganese electrode material (2) is 0.1-1.0mm.
5. The high-current lithium-manganese button cell according to claim 4, wherein the manganese electrode material (2) is made of manganese dioxide, graphite, acetylene black and polytetrafluoroethylene emulsion as raw materials and ethanol as a solvent, rolled on an aluminum screen (1) by a rolling machine, and crease lines are printed by a laser printer.
6. The high current lithium manganese button cell according to claim 1, characterized in that the separator (5) is rectangular with a thickness of 0.01-0.40mm.
7. The high-current lithium-manganese button cell according to claim 1, wherein the negative electrode sheet is rectangular, and the lithium electrode material (4) is a strip-shaped lithium strip with a thickness of 0.05-0.30mm; the thickness of the copper net (3) is 0.02-0.20mm.
8. The high current lithium manganese button cell according to claim 1, wherein the width of the negative electrode tab is smaller than the width of the positive electrode tab, the positive electrode tab extending 0.25-0.50mm outward in the width direction relative to the negative electrode tab.
9. The high current lithium manganese button cell according to claim 7, wherein the negative electrode sheet is formed from a lithium strip according to N-1: the N negative pole pieces are folded and coated on the appearance of a copper net (3) with the corresponding length of the N negative pole pieces.
10. The method of making a high current lithium manganese button cell according to any one of claims 1 to 9, wherein said method comprises:
(1) The manganese electrode material (2) obtained by the wet method is prepared according to the following formula of N-1: the N sub positive plates are rolled on the front and back sides of an aluminum pull net (1) with the corresponding length of the N sub positive plates to manufacture positive plates, folds with preset widths are printed on the corresponding positions of the back sides of the positive plates to divide the positive plates into N sub positive plates with intervals, and the aluminum pull net (1) at one end of the front side of the positive plates is exposed to form a positive plate and N-1 continuous sub positive plates;
(2) Lithium band was taken as N-1: the N negative electrode pieces are folded and coated on the front and back sides of the copper mesh (3) with the corresponding length of the N negative electrode pieces to form negative electrode pieces, and the copper mesh (3) at one end of the front side of each negative electrode piece is exposed to form a negative electrode;
(3) Coating a diaphragm (5) outside the negative electrode sheet to cover the 2N-1 sub negative electrode sheet thereon;
(4) The diaphragm (5) is coated with a positive plate, so that N sub positive plates at intervals on the back surface of the positive plate cover N-1 sub negative plates on the front surface of the negative plate and 1 sub negative plate on the back surface far away from the negative plate;
(5) Starting to reversely fold 1 piece of negative electrode plate far away from the negative electrode along the crease for N-1 times to form a battery cell;
(6) And the battery cell is arranged in a sealed cavity formed by the anode cover and the cathode cover and is filled with electrolyte, and the cathode and the anode are respectively contacted with the anode cover and the anode cover.
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| CN110289451A (en) * | 2019-07-03 | 2019-09-27 | 惠州市金芯科技有限公司 | A kind of button lithium battery and preparation method thereof |
| CN112421093B (en) * | 2020-11-17 | 2023-06-16 | 宁德时代新能源科技股份有限公司 | Battery cell lamination method |
| CN112421125A (en) * | 2020-11-17 | 2021-02-26 | 深圳吉阳智能科技有限公司 | Cell lamination method |
| CN112670512B (en) * | 2020-12-24 | 2021-08-31 | 新利达电池实业（德庆）有限公司 | Alkaline button cell and positive plate of button cell |
| CN114171771B (en) * | 2021-04-19 | 2022-08-23 | 北京郅航科技有限公司 | Laminated power battery and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245592A (en) * | 1997-12-22 | 2000-02-23 | 三菱电机株式会社 | Lithium ion secondary battery and its manufacture |
| KR20000071221A (en) * | 1999-08-18 | 2000-11-25 | 다니구찌 이찌로오, 기타오카 다카시 | Lithium ion secondary battery and method of fabricating thereof |
| JP2004207119A (en) * | 2002-12-26 | 2004-07-22 | Mitsubishi Materials Corp | Lithium ion polymer secondary battery |
| CN102683752A (en) * | 2012-04-09 | 2012-09-19 | 南京久兆新能源科技有限公司 | Stacked lithium ion power battery and manufacturing method thereof |
| CN107508004A (en) * | 2017-09-14 | 2017-12-22 | 宜昌力佳科技有限公司 | A kind of high-power lithium Mn button battery and preparation method thereof |
| CN207938729U (en) * | 2018-02-08 | 2018-10-02 | 宜昌力佳科技有限公司 | A kind of high current li-Mn button cell |
-
2018
- 2018-02-08 CN CN201810126965.3A patent/CN108461820B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245592A (en) * | 1997-12-22 | 2000-02-23 | 三菱电机株式会社 | Lithium ion secondary battery and its manufacture |
| KR20000071221A (en) * | 1999-08-18 | 2000-11-25 | 다니구찌 이찌로오, 기타오카 다카시 | Lithium ion secondary battery and method of fabricating thereof |
| JP2004207119A (en) * | 2002-12-26 | 2004-07-22 | Mitsubishi Materials Corp | Lithium ion polymer secondary battery |
| CN102683752A (en) * | 2012-04-09 | 2012-09-19 | 南京久兆新能源科技有限公司 | Stacked lithium ion power battery and manufacturing method thereof |
| CN107508004A (en) * | 2017-09-14 | 2017-12-22 | 宜昌力佳科技有限公司 | A kind of high-power lithium Mn button battery and preparation method thereof |
| CN207938729U (en) * | 2018-02-08 | 2018-10-02 | 宜昌力佳科技有限公司 | A kind of high current li-Mn button cell |
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