CN112952180B - Winding button cell with diaphragm as electrode substrate and manufacturing method - Google Patents

Winding button cell with diaphragm as electrode substrate and manufacturing method Download PDF

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Publication number
CN112952180B
CN112952180B CN202110041191.6A CN202110041191A CN112952180B CN 112952180 B CN112952180 B CN 112952180B CN 202110041191 A CN202110041191 A CN 202110041191A CN 112952180 B CN112952180 B CN 112952180B
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coating
electrode
battery
negative
positive
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CN112952180A (en
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谢红卫
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Zhongyin Ningbo Battery Co Ltd
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Zhongyin Ningbo Battery Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H01M10/0427—Button cells
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a coiled button cell taking a diaphragm as an electrode substrate and a preparation method thereof, wherein the coiled button cell comprises a positive electrode cup, a negative electrode top and a cell, the cell is accommodated between the positive electrode cup and the negative electrode top, and the cell is formed by coiling a positive plate, a first diaphragm, a negative plate and a second diaphragm at intervals from outside to inside in sequence; a first conductive coating which is conducted with the positive plate is coated on the first end face of the battery cell and is insulated with the negative plate, a second conductive coating which is conducted with the negative plate is coated on the second end face of the battery cell and is insulated with the positive plate; the first conductive coating is in contact with the inner surface of the positive electrode cup, and the second conductive coating is in contact with the inner surface of the negative electrode top; the distance between the two electrodes is shortened, and the sectional area is increased, so that the internal resistance of the battery is reduced, and the performance of the battery is improved.

Description

Winding button cell with diaphragm as electrode substrate and manufacturing method
Technical Field
The invention relates to the field of batteries, in particular to a winding type button battery with a diaphragm as an electrode substrate.
Background
Button cells, also known as button cells, are disc-shaped flat cells shaped like buttons. Button cells are generally constructed by engaging the positive cup and the negative cap with a gasket that seals and insulates the positive and negative electrodes while maintaining the cell sealed.
The positive electrode cup and the negative electrode top are usually formed by punching a nickel-plated thin steel plate or a stainless steel plate, and the sealing washer is made of a high polymer material with certain elasticity, and is usually polypropylene plastic.
Generally, the anode and cathode materials are pressed into a round cake shape and then respectively put into the anode cup and the cathode top, and the isolating layer is put between the anode and the cathode and is added with necessary electrolyte, and then the anode and the cathode materials and the sealing washer are combined into a battery.
Pressing the positive and negative electrodes into a cake-shaped structure, wherein the positive and negative electrodes are usually only one layer, so that the contact area between the positive and negative electrodes is only the sectional area of the cake-shaped positive and negative electrodes; meanwhile, the positive and negative electrodes are only one layer, so the thicknesses of the positive and negative electrodes are thicker. These factors are not favorable for the current transmission and the transmission among discharge products when the battery is discharged, so the battery with the structure has the problems of large internal resistance and small working current, the discharge current of the battery can only be generally carried out in milliampere level or even microampere level, and the use of the battery is greatly limited.
With the development of electronic technology, especially digital technology and wearable devices, higher requirements are put on the performance of button cells.
A coiled battery and a battery pack with an authorization notice number of CN207602716U, a coiled battery core with an application notice number of CN108258294A, a battery core coiling method, a coiled battery, a button battery with a coiling electrode with an authorization notice number of CN102804473B and a manufacturing method thereof all disclose a coiled battery core, the battery core is formed by coiling a positive plate, a negative plate and a diaphragm, one end of the positive plate is provided with a positive pole tab, one end of the negative plate is provided with a negative pole tab, and current is led out from the battery core to a battery shell through the tabs at two sides.
The material of the winding type battery structure is the flattening of the traditional winding type cylindrical battery, namely, the width of the electrode is greatly narrowed to reach the thickness range of the button battery, and the structural characteristics of the winding type cylindrical battery are still kept: the battery pole material is coated on the metal foil (copper, aluminum foil) and the current is led out from the metal foil by the pole ear, because the volume of the button battery is greatly reduced, especially the thickness is greatly reduced, the existence of the copper and aluminum foil matrix metal occupies a large amount of internal volume, especially a certain coating interval and a diaphragm are needed to be reserved, the limited volume is also greatly reduced, and the existence of the pole ear not only occupies the precious internal space, but also greatly increases the process difficulty because of the narrow internal space, therefore, the structure is not only greatly restricted in the capacitance, but also has great process difficulty, low product yield and low reliability.
Disclosure of Invention
The invention aims to provide a winding type button cell taking a diaphragm as an electrode substrate, which has the advantages of simple structure, large electric capacity and excellent electrical property.
The technical scheme adopted by the invention for solving the technical problems is as follows: the winding type button cell with the diaphragm as an electrode matrix comprises a positive electrode cup, a negative electrode top, a cell and electrolyte, wherein the positive electrode cup and the negative electrode top are combined to form a closed space, the electrolyte is injected into the closed space, the cell is accommodated in the closed space, and the cell is soaked by the electrolyte;
the battery core is formed by winding a positive coating, a first diaphragm layer, a negative coating and a second diaphragm layer at intervals from outside to inside in sequence;
the battery cell comprises a first end surface contacted with the positive pole cup and a second end surface contacted with the negative pole top;
one edge of the positive coating reaches the first end face of the battery cell, and a first blank area is reserved between the other edge of the positive coating and the second end face of the battery cell;
one edge of the negative coating reaches the second end face of the battery cell, and a second blank area is reserved between the other edge of the negative coating and the first end face of the battery cell;
the first blank area and the second blank area are coated with insulating coatings, so that the positive electrode coating is insulated from the first conductive coating, and the negative electrode coating is insulated from the second conductive coating;
a first conductive coating is coated on the first end face of the battery cell so as to enable the positive electrode coating to be conducted with the positive electrode cup; and a second conductive coating is coated on the second end surface of the battery cell so as to enable the negative electrode coating to be conducted with the negative electrode top.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the anode coating is coated on the outer surface of the first separator layer, and the cathode coating is coated on the inner surface of the first separator layer.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the anode coating is coated on the outer surface of the first separator layer, and the cathode coating is coated on the outer surface of the second separator layer.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the anode coating, the cathode coating and the insulating coating are coated in at least one of pattern printing, brush coating and spray coating.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the width of the first blank area and the second blank area is 0.5-2 mm.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the first conductive coating or the second conductive coating comprises a binder, a diluent, ultrafine graphite particles or superconducting carbon black, graphene and carbon nanotubes.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the first conductive coating or the second conductive coating comprises a binder, a diluent and metal powder, wherein the metal powder comprises copper, aluminum, silver, nickel and the like.
The invention adopts a further preferable technical scheme for solving the technical problems as follows: the first conductive coating or the second conductive coating adopts a vacuum plating layer, and the plated material comprises metal materials such as copper, aluminum, silver, nickel and the like;
the invention adopts a further preferable technical scheme for solving the technical problems as follows: the coating thickness of the first conductive coating or the second conductive coating is 10-200 mu m.
Another protection subject of the present invention is: the manufacturing method of the winding button cell with the diaphragm as the electrode substrate comprises the following steps:
the method comprises the following steps: respectively coating a positive electrode material and a negative electrode material on a first surface and a second surface of an unfolded first diaphragm belt in a pattern printing mode, respectively coating the positive electrode material and the negative electrode material on the edges of different sides of two surfaces of the first diaphragm belt, reserving a blank belt on the edge of the other side, and fully coating an insulating coating in the blank belt;
step two: aligning and covering a second diaphragm belt on one surface, which is coated in the first step and is attached with the negative electrode coating, of the first diaphragm belt to form a laminated structure;
step three: segmenting and cutting the laminated structure in the second step to form an electrode to be rolled;
step four: winding the electrode to be rolled manufactured in the step three by taking one end as a first end according to the outward direction of the anode coating to form an electrode roll;
step five: coating a first conductive coating on the first end face of the battery roll, and coating a second conductive coating on the second end face of the battery roll, so as to form a battery core;
step six: and (3) putting the battery cell into the negative pole top according to the direction of the second end surface of the battery cell towards the bottom surface of the negative pole top, adding electrolyte, installing a sealing washer, and then buckling a positive pole cup to seal the battery.
Another protection topic of the present invention is: the manufacturing method of the winding button cell with the diaphragm as the electrode substrate comprises the following steps:
the method comprises the following steps: coating a positive electrode material on the first surface of the first diaphragm strip by adopting a pattern printing mode, coating a negative electrode material on the first surface of the second diaphragm strip, coating the positive electrode material and the negative electrode material to one side edge of the diaphragm strip, reserving a blank strip on the other side edge, and coating an insulating coating in the blank strip;
step two: the first separator strip coated with the positive electrode coating in the step one and the second separator strip coated with the negative electrode coating are aligned and stacked to form a strip-shaped laminated structure, and the positive electrode coating and the negative electrode coating are positioned on different sides of the strip-shaped laminated structure during stacking;
step three: segmenting and cutting the laminated structure in the second step to form an electrode to be rolled;
step four: winding the electrode to be rolled manufactured in the step three by taking one end as a first end according to the outward direction of the anode coating to form an electrode roll;
step five: coating a first conductive coating on the first end face of the battery roll, and coating a second conductive coating on the second end face of the battery roll, so as to form a battery core;
step six: and (3) putting the battery core into the negative pole top according to the direction of the second end surface of the battery core towards the bottom surface of the negative pole top, adding electrolyte, installing a sealing washer, and then buckling a positive pole cup to seal the battery.
The invention is a battery technology which is completely different from the prior art, the invention utilizes the diaphragm as the matrix of the positive and negative electrode coatings, saves copper and aluminum foil as the current collectors, greatly increases the effective utilization rate of the internal space of the battery, and greatly improves the battery capacity; one side edges of the positive and negative electrode coatings are communicated with the conductive coating on the end face of the battery core to lead out current, instead of leading out current by virtue of a tab welded on a certain point of the copper and aluminum foil set, so that the structure of the battery core is greatly simplified, the density of the led-out current is uniform, the distance is greatly shortened, and the sectional area is greatly increased, thereby effectively reducing the resistance in the battery; meanwhile, the production process of the battery is simplified, the internal structure of the battery is simplified, the size of the battery is favorably reduced, and the defects that the electrode lug is easy to fall off and breakdown and the like of the original electrode lug mechanism are overcome.
Drawings
The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.
FIG. 1 is a first schematic view of the coating of an electrode coating according to a first embodiment of the present invention;
FIG. 2 is a second schematic diagram of the coating of the electrode coating according to the first embodiment of the present invention;
FIG. 3 is a schematic diagram of the preparation of electrode to be rolled according to the first embodiment of the present invention;
fig. 4 is a schematic diagram of a battery cell according to a first embodiment of the present invention;
fig. 5 is a partially enlarged view of a battery cell according to a first embodiment of the present invention;
fig. 6 is a schematic diagram of a wound button cell according to a first embodiment of the invention;
FIG. 7 is a schematic diagram of the preparation of an electrode to be rolled according to a second embodiment of the present invention;
FIG. 8 is a first schematic diagram of an electrode to be rolled in accordance with a preferred embodiment of the present invention;
FIG. 9 is a second schematic diagram of an electrode to be rolled in accordance with a preferred embodiment of the present invention;
fig. 10 is a third schematic diagram of the electrode to be rolled according to the preferred embodiment of the invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, and is not to be construed as limiting the scope of the invention.
It should be noted that: like reference numerals refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "front" and "back" and the like indicate orientations and positional relationships based on orientations and positional relationships shown in the drawings or orientations and positional relationships where the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The first embodiment is as follows:
the method for preparing the winding type button cell with the diaphragm as the electrode substrate comprises the following steps:
1. preparation work:
preparation of the diaphragm: taking a first membrane roll and a second membrane roll which are wide and formed by winding a first membrane strip along the length direction, winding the first membrane roll and the second membrane strip along the length direction to form a second membrane roll, and cutting the first membrane roll and the second membrane roll into proper widths according to the height of the button cell so as to enable the widths of the first membrane strip and the second membrane strip to be the same.
Preferably, in this embodiment, the first membrane tape and the second membrane tape may be any one of PE, PP, and PET.
Preparing anode and cathode materials: the corresponding active material, conductive agent, binder and necessary dispersant are mixed to form the desired positive and negative electrode materials.
Preferably, the positive electrode active material is lithium cobaltate, and the negative electrode active material is a silicon carbon material.
2. Manufacturing a battery:
the method comprises the following steps: preparation of electrodes to be rolled
a. As shown in fig. 1 and 2, a first separator roll is taken, the first separator roll is gradually unwound into a first separator tape, and a positive electrode material and a negative electrode material are respectively coated on a first surface and a second surface of the unwound first separator tape by a pattern printing mode.
After coating, a plurality of coating units which are arranged in parallel are formed on the spread first diaphragm belt, and each coating unit corresponds to one battery cell. Subsequent first separator tapes will be slit to form the first separator layer 2 of each cell. The strip-shaped coating areas a of each first membrane layer 2, coated with the conductive coating, are located on different sides of the two faces, leaving a blank band B on the opposite side. That is, the first surface of each first separator layer 2 is formed of the strip-shaped positive electrode coating 1 and the first blank stripes 11 extending in the length direction of the separator in parallel to each other, and the second surface of each first separator layer 2 is formed of the strip-shaped negative electrode coating 3 and the second blank stripes 13 extending in the length direction of the separator in parallel to each other. The first blank band 11 and the second blank band 13 are positioned on different sides of the two faces, and one side of the strip-shaped positive electrode coating 1 and one side of the strip-shaped negative electrode coating 3 are respectively coated on the edges of the different sides of the two faces of the first separator strip 2.
It should be noted that the application position can be made accurate by means of graphic printing. Besides the pattern printing mode, the coating mode of the electrode coating can also be brush coating or spraying and the like.
The width of the first and second blank bands 11 and 13 may be 0.5 to 2mm according to the specification of the battery, and in the present embodiment, the width of the first and second blank bands 11 and 13 is 1mm.
Preferably, a third conductive coating 6 is further coated on the positive electrode coating 1 and the negative electrode coating 3, in such a way that current collection is performed on the wound positive and negative electrodes.
Further preferably, the insulating coating 7 is applied to the inside of the first and second blank stripes 11, 13 by pattern printing.
It should be noted that, in the preparation process of the electrode to be rolled, a printing coating device is used to coat the anode or cathode material, the third conductive coating layer and the insulating coating layer onto the separator. In order to improve the efficiency, the coating is continuously printed on the wide diaphragm belt in a pattern printing mode and then is cut.
Preferably, when the electrode coating is printed on the diaphragm by adopting a graphic printing method, a slitting gap is reserved at the front section and the rear section so as to facilitate subsequent slitting, and the situations of powder falling of the cut material and burr short circuit caused by a cutter can be effectively avoided. By adopting the mode, the continuous operation of coating the electrode coating can be realized, the production process is simplified, the production cost is reduced, and the production efficiency is improved.
b. And c, gradually unwinding the second separator roll into a second separator tape, and aligning and covering the second separator tape on the side, to which the negative electrode coating is attached, of the first separator tape coated in the step a to form a laminated structure.
c. And c, segmenting and cutting the laminated structure corresponding to the coating unit in the step b, thereby forming the electrode to be rolled. The electrode to be rolled comprises a positive electrode coating 1, a first diaphragm layer 2, a negative electrode coating 3 and a second diaphragm layer 4 from top to bottom.
Step two: preparation of electrode roll
As shown in fig. 3, the electrode to be rolled manufactured in the previous step is rolled with one end as the first end by a winder to form an electrode roll, and the rolling direction is as shown by an arrow in fig. 3, that is, the electrode roll is rolled in the direction in which the positive electrode coating 1 faces outward. After winding, an adhesive tape for fixing is attached to the outer periphery of the electrode roll to prevent the electrode roll from loosening.
The formed battery roll is formed by winding a positive electrode coating 1, a first separator layer 2, a negative electrode coating 3 and a second separator layer 4 at intervals from outside to inside in sequence. The positive electrode coating 1 is positioned on the outer surface of the first separator layer 2, and the negative electrode coating 3 is positioned on the inner surface of the second separator layer 4.
One edge of the positive electrode coating 1 reaches the first end face of the battery roll, and a first blank area is left between the other edge of the positive electrode coating 1 and the second end face of the battery roll or is fully coated with an insulating coating 7; one edge of the negative electrode coating 3 reaches the second end face of the battery roll, a second blank area is reserved between the other edge of the negative electrode coating 3 and the first end face of the battery roll or the insulating coating 7 is fully coated on the first blank area, the insulating coating is the width of the first blank area and the second blank area, namely the width of the first blank area and the second blank area, and the width dimension is 0.5-2 mm.
Step three: forming an electrical core
As shown in fig. 3 and 4, a first end face of the battery roll is coated with a first conductive coating 8, and a second end face is coated with a second conductive coating 9, so as to form a battery cell.
Preferably, the first conductive coating 8 or the second conductive coating 9 is coated to a thickness of 10 to 200 μm.
It will be appreciated that the edge of the positive coating 1 is flush with the first end face of the battery roll so that the positive coating 1 is in conductive communication with the first conductive coating 8, while the edge of the negative coating 3 is insulated from the first conductive coating 9 by the insulating coating 7 or first empty areas. Correspondingly, the edge of the negative electrode coating 3 is flush with the second end face of the battery roll, so that the negative electrode coating 3 is in conduction with the second conductive coating 9, and the edge of the positive electrode coating 1 is insulated by the insulating coating 7 or the second empty area being isolated from the second conductive coating 9. In addition, the surfaces of the positive electrode coating 1 and the negative electrode coating 3 are coated with the third conductive coating 6, and are not spread here.
As an alternative, the first conductive coating or the second conductive coating includes a binder, a diluent, and ultrafine graphite particles or superconducting carbon black, graphene, and carbon nanotubes.
As another alternative, the first conductive coating or the second conductive coating includes a binder, a diluent, and metal powder including copper, aluminum, silver, nickel, etc.
In addition, the first conductive coating or the second conductive coating can also adopt vacuum plating, and the plated material comprises metal materials such as copper, aluminum, silver, nickel and the like.
Step four: battery formation
As shown in fig. 4 to 6, the battery cell 100 is placed in the negative electrode top 200 in a direction that the second end face C of the battery cell 100 faces the bottom surface of the negative electrode top 200, the electrolyte is added, after the sealing gasket 400 is installed, the positive electrode cup 300 is fastened, so that the first end face D of the battery cell 100 faces the inner surface of the positive electrode cup 300, and the battery is sealed by using the battery packaging device.
Preferably, the positive electrode cup 300 and the negative electrode top 200 are generally formed by stamping a nickel-plated thin steel plate or a stainless steel plate, and the sealing washer is made of a polymer material with certain elasticity, and is more commonly made of polypropylene plastic.
The formed winding type button cell with the diaphragm as an electrode substrate comprises a positive electrode cup 300, a negative electrode top 200, a cell 100 and electrolyte, wherein the cell 100 is accommodated in a closed space formed by combining the positive electrode cup 300 and the negative electrode top 200, and the cell 100 is formed by winding a positive electrode coating 1, a first diaphragm layer 2, a negative electrode coating 3 and a second diaphragm layer 4 at intervals from outside to inside in sequence; the battery cell 100 comprises a first end face C in contact with the positive electrode cup 300 and a second end face D in contact with the negative electrode top 200; one edge of the positive electrode coating 1 reaches the first end face C of the battery cell 100, and a first blank area is left between the other edge of the positive electrode coating 1 and the second end face D of the battery cell 100; one edge of the negative electrode coating 3 reaches the second end face D of the battery cell 100, and a second blank area is left between the other edge of the negative electrode coating 3 and the first end face C of the battery cell 100; a first conductive coating 8 is coated on the first end surface C of the battery cell 100, so that the positive electrode coating 1 is conducted with the positive electrode cup 300; the second end face D of the battery cell 100 is coated with the second conductive coating 9, so that the negative electrode coating 3 is conducted with the negative electrode top 200.
Since the whole battery core 100 has a very thin unfolded thickness and a relatively long length, the contact area between the positive electrode and the negative electrode is very large, the battery has very small ohmic internal resistance and good ionic conductivity, and thus the battery performance is greatly improved.
And more importantly, the first conductive coating and the second conductive coating replace the tabs, so that the distance between the two electrodes is shortened, the sectional area is increased, the internal resistance of the battery is reduced, and the performance of the battery is improved. Meanwhile, the production process of the battery is simplified, the internal structure of the battery is simplified, the size of the battery is favorably reduced, and the defects that the electrode lug is easy to fall off and breakdown and the like of the original electrode lug mechanism are overcome.
Further preferably, the inner surfaces of the negative electrode top 200 and the positive electrode cup 300 may also be coated with a conductive coating to reduce the contact resistance between the electrodes and the negative electrode top 200 and the positive electrode cup 300.
The second embodiment:
the method for preparing the winding button cell comprises the following steps:
1. preparation work:
preparation of the diaphragm: the method comprises the steps of taking a first wide diaphragm roll formed by winding a first diaphragm belt along the length direction and a second wide diaphragm roll formed by winding a second diaphragm belt along the length direction, cutting the first diaphragm roll and the second diaphragm roll into proper widths according to the height of the button cell, and enabling the widths of the first diaphragm belt and the second diaphragm belt to be the same.
Preferably, in this embodiment, the first separator tape and the second separator tape may be selected from one of PE and PP.
Preferably, the second surfaces of the first and second separator strips are subjected to a ceramic plating treatment.
Preparing anode and cathode materials: the corresponding active materials, conductive agents, binders and necessary dispersants are mixed to form the desired positive and negative electrode materials.
Preferably, the positive electrode active material is lithium cobaltate, and the negative electrode active material is a silicon carbon material.
3. Manufacturing a battery:
preparing an electrode to be rolled:
a. a positive electrode material is coated on a first surface of a first separator tape unwound from a first separator roll by a pattern printing method, and a negative electrode material is coated on a first surface of a second separator tape unwound from a second separator roll.
As shown in fig. 7, after coating, a plurality of coating units corresponding to the electrode to be rolled are formed on the first surfaces of the first separator tape and the second separator tape in parallel, and after coating, a plurality of coating units corresponding to one battery cell are formed on the first separator tape which is spread out. Subsequent first separator strips will be slit to form the first separator layer 2' of each cell. In the same way the second separator strip will be slit to form the second separator layer 4' of each cell.
The first surface of the first separator layer 2 'is formed of a strip-shaped positive electrode coating 1' and a first blank band extending in parallel to each other in the longitudinal direction of the separator, and the first surface of the second separator layer 4 'is formed of a strip-shaped negative electrode coating 3' and a second blank band extending in parallel to each other in the longitudinal direction of the separator.
It should be noted that the application position can be made accurate by means of graphic printing. Besides the pattern printing mode, the coating mode of the electrode coating can also be brush coating or spraying and the like.
The width of the first and second blank bands may be 0.5 to 2mm according to the specification of the battery, and in the present embodiment, the width of the first and second blank bands is 1mm.
Preferably, a third conductive coating 6' is further coated on the positive electrode coating 1' and the negative electrode coating 3', in such a manner as to collect current from the wound positive and negative electrodes.
Further preferably, the first and second blank bands are filled with an insulating coating 7' by means of graphic printing.
It should be noted that, in the preparation process of the electrode to be rolled, a printing coating device is used to coat the positive electrode material or the negative electrode material, the third conductive coating layer and the insulating coating layer on the separator. In order to increase the efficiency, the coating is continuously printed on a wide diaphragm belt in a pattern printing mode, and then the diaphragm belt is cut.
Preferably, when the electrode coating is printed on the diaphragm by adopting a graphic printing method, a cutting gap is reserved at the front section and the rear section so as to facilitate subsequent cutting, and the situations of powder falling of the cut material and burr short circuit caused by a cutter can be effectively avoided. By the method, continuous operation of coating the electrode coating can be realized, the production process is simplified, the production cost is reduced, and the production efficiency is improved.
b. And c, aligning and stacking the first separator strip coated with the positive electrode coating and the second separator strip coated with the negative electrode coating in the step a to form a strip-shaped laminated structure. It is to be noted that the positive electrode coating and the negative electrode coating are located on different sides of the band-shaped laminated structure when stacked.
Preferably, in this embodiment, the width of the first separator tape and the second separator tape is twice the required width in the preparation work, and when the electrode coating is applied, the electrode coating is applied to the middle coating region of the separator, the both sides of the separator are left with the equally spaced margin regions, and the both side margin regions are printed with the insulating coating, and then are cut into two pieces from the middle, thereby improving the production efficiency.
c. And c, segmenting and cutting the laminated structure corresponding to the coating unit in the step b, thereby forming the electrode to be rolled. The electrode to be rolled comprises a positive electrode coating, a first diaphragm layer, a negative electrode coating and a second diaphragm layer from top to bottom.
In addition, in this embodiment, the steps of manufacturing the electrode roll, manufacturing the battery cell, and forming the battery are similar to those of the embodiment, and will not be described again here.
The winding type button cell provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the examples is only used to help the present invention and the core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. The winding type button cell with the diaphragm as an electrode matrix is characterized by comprising a positive electrode cup, a negative electrode top, a cell and electrolyte, wherein the positive electrode cup and the negative electrode top are combined to form a closed space; the battery core is formed by winding a positive coating, a first diaphragm layer, a negative coating and a second diaphragm layer at intervals from outside to inside in sequence;
the battery cell comprises a first end surface contacted with the positive pole cup and a second end surface contacted with the negative pole top; one edge of the positive coating reaches the first end face of the battery cell, and a first blank area is reserved between the other edge of the positive coating and the second end face of the battery cell;
one edge of the negative coating reaches the second end face of the battery cell, and a second blank area is reserved between the other edge of the negative coating and the first end face of the battery cell;
the first blank area and the second blank area are coated with insulating coatings, so that the positive electrode coating is insulated from the first conductive coating, and the negative electrode coating is insulated from the second conductive coating;
a first conductive coating is coated on the first end face of the battery cell so as to enable the positive electrode coating to be conducted with the positive electrode cup; and a second conductive coating is coated on the second end surface of the battery cell so as to enable the negative electrode coating to be conducted with the negative electrode top.
2. The coiled button cell with the membrane as the electrode substrate according to claim 1, wherein the positive electrode coating, the negative electrode coating and the insulating coating are applied by at least one of graphic printing, brush coating and spraying.
3. The wound button cell with the separator as the electrode substrate according to claim 1, wherein the width of the first and second blank regions is 0.5-2 mm.
4. The wound button cell with the separator as the electrode substrate according to claim 1, wherein the positive electrode coating is coated on the outer surface of the first separator layer, and the negative electrode coating is coated on the inner surface of the first separator layer.
5. The wound button cell with the separator as the electrode substrate according to claim 1, wherein the positive electrode coating is coated on the outer surface of the first separator layer, and the negative electrode coating is coated on the outer surface of the second separator layer.
6. The coiled button cell with a diaphragm as an electrode substrate according to claim 1, wherein the first conductive coating or the second conductive coating comprises a binder, a diluent, and ultrafine graphite particles or superconducting carbon black, graphene, carbon nanotubes.
7. The coiled button cell with the separator as the electrode substrate according to claim 1, wherein the first conductive coating or the second conductive coating comprises a binder, a diluent, and metal powder, and the metal powder comprises copper, aluminum, silver, and nickel.
8. The wound button cell with the membrane as the electrode substrate according to claim 1, wherein the first conductive coating or the second conductive coating is vacuum plated, and the plated material is copper, aluminum, silver or nickel.
9. The method for manufacturing a coiled button cell with a membrane as an electrode substrate according to any one of claims 1 to 8, which comprises the following steps:
the method comprises the following steps: respectively coating a positive electrode material and a negative electrode material on a first surface and a second surface of an unfolded first diaphragm belt in a pattern printing mode, respectively coating the positive electrode material and the negative electrode material on the edges of different sides of two surfaces of the first diaphragm belt, reserving a blank belt on the edge of the other side, and fully coating an insulating coating in the blank belt;
step two: aligning and covering a second separator strip on one surface, which is coated in the first step and is attached with the negative electrode coating, of the first separator strip to form a laminated structure;
step three: segmenting and cutting the laminated structure in the second step to form an electrode to be rolled;
step four: winding the electrode to be rolled manufactured in the step three by taking one end as a first end according to the outward direction of the anode coating to form an electrode roll;
step five: coating a first conductive coating on a first end surface of the battery roll, and coating a second conductive coating on a second end surface of the battery roll, so as to form a battery core;
step six: and (3) putting the battery core into the negative pole top according to the direction of the second end surface of the battery core towards the bottom surface of the negative pole top, adding electrolyte, installing a sealing washer, and then buckling a positive pole cup to seal the battery.
10. The method for manufacturing a coiled button cell with a membrane as an electrode substrate according to any one of claims 1 to 8, which comprises the following steps:
the method comprises the following steps: coating a positive electrode material on the first surface of the first diaphragm strip by adopting a pattern printing mode, coating a negative electrode material on the first surface of the second diaphragm strip, coating the positive electrode material and the negative electrode material to one side edge of the diaphragm strip, reserving a blank strip on the other side edge, and coating an insulating coating in the blank strip;
step two: aligning and stacking the first separator strip coated with the positive electrode coating and the second separator strip coated with the negative electrode coating in the step one to form a strip-shaped laminated structure, wherein the positive electrode coating and the negative electrode coating are positioned on different sides of the strip-shaped laminated structure during stacking;
step three: segmenting and cutting the laminated structure in the second step to form an electrode to be rolled;
step four: winding the electrode to be rolled manufactured in the step three by taking one end as a first end according to the outward direction of the anode coating to form an electrode roll;
step five: coating a first conductive coating on the first end face of the battery roll, and coating a second conductive coating on the second end face of the battery roll, so as to form a battery core;
step six: and (3) putting the battery core into the negative pole top according to the direction of the second end surface of the battery core towards the bottom surface of the negative pole top, adding electrolyte, installing a sealing washer, and then buckling a positive pole cup to seal the battery.
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