CN107305942B - Winding type negative plate, battery cell with same and lithium slurry battery - Google Patents
Winding type negative plate, battery cell with same and lithium slurry battery Download PDFInfo
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- CN107305942B CN107305942B CN201610256695.9A CN201610256695A CN107305942B CN 107305942 B CN107305942 B CN 107305942B CN 201610256695 A CN201610256695 A CN 201610256695A CN 107305942 B CN107305942 B CN 107305942B
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/381—Alkaline or alkaline earth metals elements
- H01M4/382—Lithium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention provides a negative electrode sheet for a lithium slurry battery, wherein the negative electrode sheet is formed with a plurality of straight portions and curved portions by winding in a spiral or arcuate manner, gaps for receiving a positive electrode sheet of a semi-solid lithium slurry battery being formed between the respective straight portions, wherein the negative electrode sheet comprises a porous structure body and a plurality of lithium-containing metal bodies connected to the porous structure body in a spaced manner such that the respective lithium-containing metal bodies are respectively located in the respective straight portions of the negative electrode sheet after the negative electrode sheet is wound. By adopting the winding type negative plate, the manufacturing efficiency of the semi-solid lithium slurry battery can be effectively improved, the problems of electrode breakage, conductive slurry leakage and the like caused by winding the sandwich composite positive plate containing the conductive slurry are avoided, and the working performance and the safety of the battery are effectively improved. In addition, the invention also provides a battery core provided with the wound negative plate and a lithium paste battery.
Description
Technical Field
The invention belongs to the electrochemical power battery technology, and particularly relates to a winding type semi-solid lithium slurry battery.
Background
Lithium ion batteries are novel high-energy batteries using lithium intercalation compounds as positive and negative electrode materials, and have a series of advantages of high specific energy, high voltage, small self-discharge, good cycle performance, long service life and the like compared with lead-acid batteries and nickel-hydrogen batteries, and are receiving more and more attention. In recent years, lithium ion battery technology has been rapidly developed and has begun to be applied to electric vehicles.
The invention patent 2016101285248 in china proposes a semi-solid lithium slurry battery, the positive electrode of the battery contains rheologically conductive slurry, the negative electrode is a metallic lithium sheet or other lithium-containing negative electrode sheet, which can effectively increase the charge capacity of the battery and improve the safety of the battery. However, according to the existing battery assembly technology, the battery assembly is generally only a winding type or a lamination type: (1) the laminated battery has higher precision requirement on battery processing equipment, particularly, burrs are easily generated in the process of manufacturing and assembling along with the doubled increase of the circumferences of the punched edges of the battery core sandwich composite positive plate and the lithium-containing negative plate, the problem of short circuit is further caused, and the safety risk of the battery is increased; (2) the diaphragm of the winding type battery is positioned between the positive plate and the lithium-containing negative plate to separate the positive plate and the lithium-containing negative plate, and the diaphragm, the positive plate and the lithium-containing negative plate are wound together to form a battery core; (3) at present, positive and negative electrode materials of a winding type battery are folded and wound for multiple times, so that the conditions of falling of the electrode materials, inconsistent current collection conditions of a winding surface and a plane, heating of the winding surface and the like are easily caused, and the safety of the battery is reduced.
In addition, since the power batteries for vehicles need to be connected in series or in parallel to provide sufficient power, the batteries need to have good charge and discharge performance, and the batteries are easily connected to each other, thereby reducing the connection resistance of the battery pack. Most coiling formula lithium cell at present adopts a positive terminal and a negative terminal all to be located the homonymy water conservancy diversion of battery, causes easily: (1) for a lithium slurry battery with a large electrode reaction area in the battery, a positive terminal and a negative terminal are adopted to deliver current, the ratio of the current conduction area to the electrode reaction area is small, and the heat dissipation performance and the high-rate discharge performance of the battery are poor; (2) the series and parallel connection between the batteries is inconvenient, which brings inconvenience to the subsequent overall assembly of the automobile circuit and increases the risk of short circuit caused by the direct contact of the positive and negative terminals.
Disclosure of Invention
In view of the above problems, the present invention provides a wound lithium slurry battery, which includes a plurality of sandwich composite positive electrode sheets and a lithium-containing negative electrode sheet in a wound structure, wherein the lithium-containing negative electrode sheet forms a plurality of straight portions and a plurality of curved portions by winding, and the sandwich composite positive electrode sheet is disposed between the straight portions to form a battery cell. By adopting the winding mode, the manufacturing efficiency of the lithium slurry battery can be effectively improved, the problems of electrode fracture, conductive slurry leakage, electrode material layer falling and the like caused by winding the sandwich composite positive plate containing the conductive slurry are avoided, and the working performance and the safety of the battery are effectively improved.
The technical scheme provided by the invention is as follows:
according to the present invention, there is provided a negative electrode sheet for a lithium paste battery, wherein the negative electrode sheet is formed with a plurality of straight portions and a plurality of bent portions by winding, a gap for accommodating a positive electrode sheet of the lithium paste battery is formed between the respective straight portions, the gap has a width equal to or greater than the thickness of the positive electrode sheet, and the straight portions have a length equal to or greater than the width of the positive electrode sheet, wherein the negative electrode sheet includes a porous structure body and a plurality of lithium-containing metal bodies connected to the porous structure body in a manner spaced apart from each other such that the respective lithium-containing metal bodies are respectively located in the respective straight portions of the negative electrode sheet after the negative electrode sheet is wound. The lithium-containing metal body is used as a negative electrode material for battery reaction, and the porous structure body can be used as a negative electrode current collector and a negative electrode tab, so that the effect of simplifying the battery structure is achieved.
The negative electrode sheet includes two layers of porous structures and the lithium-containing metal body is disposed between the two layers of porous structures, or the negative electrode sheet includes one layer of porous structures and the lithium-containing metal body is disposed at corresponding positions on both sides of the porous structures, or the negative electrode sheet includes one layer of porous structures and the lithium-containing metal body is disposed inside the porous structures.
The lithium-containing metal body is fixed to the porous structure body by welding, spraying, bonding, electrochemical plating, electroless plating, mechanical press-fitting, or the like.
The lithium-containing metal body is a lithium-containing negative electrode material layer with the thickness of 0.02-2 mm preferably. The lithium-containing negative electrode material layer is made of metal lithium, high-lithium alloy or lithium-rich inorganic non-metallic material.
The porous structure body of the negative plate is an electronic conducting layer with the thickness of 0.01-1000 mu m, the porosity of a through hole is 50-95%, the average pore diameter is 1-500 mu m, and the material of the porous structure body comprises copper, stainless steel, nickel, titanium, silver, tin-plated copper, nickel-plated copper and silver-plated copper, preferably copper; further, the surface of the porous structure body is coated with a conductive carbon material coating or compounded with metal lithium in a pressing or electrochemical plating mode;
or the porous structure body is a porous organic material which is formed by mixing carbon fiber conductive cloth, metal wires and organic fiber wires, or by coating a conductive carbon material coating on the surface of the conductive cloth or plating a metal film on the surface of the conductive cloth, wherein the porous organic material comprises natural cotton and hemp, terylene, aramid fiber, nylon, polypropylene, polyethylene, polytetrafluoroethylene and other organic matters with good electrolyte resistance.
The winding is either in a helical manner or in an arcuate manner. It should be noted, however, that the winding mentioned here is not limited to these two forms as long as the negative electrode sheet forms the straight portions and the bent portions and the gaps for accommodating the positive electrode sheet are formed between the straight portions by winding.
A plurality of negative electrode tabs may be provided on one side edge or the opposite side edge of the negative electrode sheet, the negative electrode tabs being located in the respective straight portions of the negative electrode sheet after the negative electrode sheet is wound. Preferably, after the negative electrode sheet is wound, the positions of the negative electrode tabs located on the same side of the negative electrode sheet are located on the same straight line. In addition, it is preferable that the positions of the negative electrode tabs located at both sides of the negative electrode sheet correspond to each other after the negative electrode sheet is wound.
When the negative electrode sheet is spirally wound, the bent portions at one side of the straight portion are in contact with each other, and the bent portions at the other side of the straight portion are also in contact with each other. When the negative electrode sheet is wound in an arcuate manner, the negative electrode sheet includes two outermost straight portions located at outermost sides of the negative electrode sheet, the length of the outermost straight part is more than or equal to the sum of the length of the straight part of the middle part and the height of the battery cell, the outermost side straight line part is bent to form an outermost side horizontal straight line part and an outermost side vertical straight line part, wherein one of the outermost vertical straight portions is in electrical contact with each of the bent portions at one side of the negative electrode tab and the other outermost vertical straight portion is in electrical contact with each of the bent portions at the other side of the negative electrode tab, if the length of the outermost straight portion is greater than the sum of the length of the straight portion of the middle portion and the height of the battery cell, the end of the outermost vertical straight line part formed after bending the outermost straight line part can be used as a negative current collector and a negative electrode tab of the negative electrode sheet; or, when the negative electrode sheet is wound in an arched manner, the negative electrode sheet comprises two outermost straight parts located on the outermost side of the negative electrode sheet, the length of each outermost straight part is greater than or equal to the sum of the length of the straight part of the middle part and the height of the battery cell, wherein one outermost straight part forms an outermost horizontal straight part and an outermost vertical straight part through bending, the outermost vertical straight parts are in electrical contact with the bent parts located on one side of the negative electrode sheet, and the other outermost straight part is used as a negative electrode collector and a negative electrode tab of the negative electrode sheet.
According to the present invention, there is provided a battery cell comprising the negative electrode sheet for a lithium paste battery and the positive electrode sheet for a lithium paste battery as described above, the positive electrode sheet being disposed in the gap formed between the straight portions of the negative electrode sheet to form a structure in which the negative electrode sheet and the positive electrode sheet are alternately stacked.
The positive plate is provided with a positive pole tab, the positive pole tab is electrically connected with two porous positive pole current collectors of the sandwich composite positive plate and extends out of the sandwich composite positive plate, and all the positive pole tabs in the battery core are electrically connected and extend out of the battery core; the lithium-containing negative plate is provided with a negative tab, the negative tab is electrically connected with a negative current collector, and all the negative tabs in the battery cell are electrically connected and extend out of the battery cell.
The structure of the positive plate can be a sandwich composite positive plate. The structure of the sandwich composite positive electrode sheet is given by way of example to facilitate a better understanding of the present invention. The sandwich composite positive plate comprises a porous current collecting positive plate layer and conductive slurry, wherein the porous current collecting positive plate layer is formed by coating a porous positive material layer on one side or two sides of a porous positive current collector, the conductive slurry with the thickness of 0-5 mm is filled between the two porous current collecting positive plate layers, and part or all of the conductive slurry permeates into pores of the porous current collecting positive plate layers to form the sandwich composite positive plate; and the periphery of the sandwich composite positive plate is provided with an insulating sealing frame which is in a shape of a 'return' and is fixedly sealed with the edge of the porous current-collecting positive plate, so that the conductive slurry is prevented from leaking from four sides of the sandwich composite positive plate. It should be noted that the positive electrode sheet herein may be any positive electrode sheet for a lithium paste battery, and the structure thereof is not limited to the above-described examples.
The thickness of the porous current-collecting positive electrode layer is 0.05-2.5 mm, the porosity is 30-90%, and the average pore diameter is 0.001-10 μm; the holes of the sandwich composite positive plate are filled with electrolyte and/or polymer electrolyte, and the polymer electrolyte is a gel polymer electrolyte composite material formed by compounding a polymer matrix, a liquid organic plasticizer and lithium salt. The porous positive current collector is a porous mixture of a conductive filler and a binder, wherein the conductive filler is one or more of carbon black, carbon nano tubes, carbon fibers, graphene, titanium powder, aluminum powder, silver powder, alloy aluminum powder, stainless steel powder or silver powder, lithium-rich silicon powder and lithium-containing alloy powder metal alloy conductive particles, or lithium-containing carbon materials, the binder is one or more of polyvinyl chloride, polyethylene, polypropylene, polystyrene, polytetrafluoroethylene, polyterephthalate, polyamide, polyimide, polyether nitrile, polymethyl acrylate, polyvinylidene fluoride, polyurethane, polyacrylonitrile, styrene butadiene rubber, sodium carboxymethylcellulose and modified polyolefin, and the mass fraction of the conductive filler is not less than 70%; or the porous positive current collector is a metal conducting layer with a porous structure, the metal conducting layer is formed by weaving a porous structure body, metal wires or metal wires with a conductive carbon material coating attached to the surface, and meshes are square, rhombic, rectangular or polygonal; or the metal conducting layer is a porous foam metal layer with a porous structure, or is formed by mechanically stamping or chemically corroding a porous metal plate or a metal foil, and the metal conducting layer is made of aluminum, alloy aluminum, stainless steel, silver, tin or titanium, preferably aluminum; or the porous positive current collector is conductive carbon fiber conductive cloth, metal wire and organic fiber mixed conductive cloth, a porous organic material with a conductive carbon material coating coated on the surface or a metal film plated on the surface, the porous organic material comprises natural cotton hemp, terylene, aramid fiber, nylon, polypropylene fiber, polyethylene, polytetrafluoroethylene and other organic matters with good electrolyte resistance, and the metal wire and the plated metal film are made of aluminum, alloy aluminum, stainless steel or silver, preferably aluminum; or the porous positive current collector is a composite current collector consisting of any two or more of the current collectors.
The porous positive electrode material layer is formed by uniformly mixing 59-98% of positive electrode active material, 1-40% of conductive agent and 1-10% of binder according to the mass ratio, coating the mixture on the surface of a porous positive electrode current collector, and drying and tabletting the mixture. Further, the positive active material is one or more of lithium iron phosphate, lithium manganese phosphate, lithium silicate, lithium iron silicate, sulfate compounds, sulfur-carbon compounds, elemental sulfur, titanium sulfur compounds, molybdenum sulfur compounds, iron sulfur compounds, doped lithium manganese oxides, lithium cobalt oxides, lithium titanium oxides, lithium vanadium oxides, lithium nickel manganese oxides, lithium nickel cobalt aluminum oxides, lithium nickel cobalt manganese oxides, lithium iron nickel manganese oxides, and other lithium intercalatable compounds.
The conductive paste comprises electrolyte and positive conductive particles capable of flowing in the electrolyte, wherein the mass ratio of the positive conductive particles to the conductive paste is 10-90%, and the average particle size is 0.5-500 μm; the positive conductive particles are one or more of carbon black, Ketjen black, graphene, carbon nanotubes, carbon fibers, amorphous carbon, various metal conductive particles and other conductive agents which are compounded in a surface coating, bonding or mechanical mixing mode; or the positive conductive particles are a compound or a mixture of a positive active material and the various conductive agents, wherein the mass ratio of the positive active material to the conductive agents is 0-98%, and the compound or mixing mode comprises surface coating, bonding or mechanical mixing.
It should be noted that the positive electrode sheet herein may be any positive electrode sheet for a lithium paste battery, and the structure and material thereof are not limited to the above examples.
According to the invention, a lithium slurry battery is provided, which comprises the above-mentioned battery core, a battery shell, a positive terminal, a negative terminal, a liquid injection port and electrolyte, wherein the battery core is arranged in the battery shell, a positive electrode tab of the battery core is electrically connected to the positive terminal, a negative electrode tab of the battery core is electrically connected to the negative terminal, the positive terminal and the negative terminal are extended out of the battery shell and are in fluid seal with the battery shell, and the electrolyte is injected into the battery shell through the liquid injection port so that the battery core is placed in the electrolyte.
The invention has the advantages that:
1) the battery core is wound by adopting the negative plate, the positive plate is arranged in the gap formed between the straight line parts of the negative plate so as to form a structure that the negative plate and the positive plate are overlapped in a crossed manner, the manufacturing efficiency of the semi-solid lithium slurry battery can be effectively improved, the problems of electrode fracture, conductive slurry leakage, electrode material layer falling and the like caused by winding the sandwich composite positive plate containing the conductive slurry are avoided, and the working performance and the safety of the battery are effectively improved;
2) the lithium-containing metal body is used as a negative electrode material for battery reaction, the porous structure body can be used as a negative electrode current collector and a negative electrode tab, the current collecting effect is uniform, the situations of heating and the like caused by high-rate charge and discharge are avoided, and the effect of simplifying the battery structure is achieved.
Drawings
Fig. 1 is a schematic cross-sectional view of a lithium paste battery according to the present invention;
fig. 2 is a schematic diagram of a cell according to the present invention, wherein a positive tab and a negative tab are located on the same side of the cell;
fig. 3 is a schematic diagram of a cell according to the present invention, wherein a positive tab and a negative tab are located on opposite sides of the cell;
fig. 4 (a) and (b) are schematic views of a positive electrode sheet, wherein fig. 4 (a) is a cross-sectional view of the positive electrode sheet, and fig. 4 (b) is a schematic perspective view of the positive electrode sheet provided with a positive electrode tab on one or both sides;
fig. 5 (a), (b), (c) are schematic cross-sectional views of the negative electrode sheet according to the present invention;
fig. 6 (a), (b), (c), (d) are schematic plan views of the negative electrode sheet according to the present invention;
fig. 7 is a first embodiment of a wound negative electrode sheet according to the present invention;
fig. 8 is a second embodiment of a wound negative electrode sheet according to the present invention;
fig. 9 is a third embodiment of a wound negative electrode sheet according to the present invention;
fig. 10 is a fourth embodiment of a wound negative electrode sheet according to the present invention; and
fig. 11 (a) and (b) are schematic diagrams illustrating the bending process of the outermost straight portion of the negative electrode sheet according to the present invention.
List of reference numerals
1-lithium slurry battery
2-Battery case
3-positive terminal
4-negative terminal
5-Electrical core
6-liquid injection port
7-negative plate
701-negative pole tab
702-straight line portion
703-curved part
704-gap
706-gap
707 porous Structure
708-lithium-containing metal bodies
709-end of porous Structure
7010-outermost straight line portion
7011-outermost horizontal straight line portion
7012-outermost vertical straight line portion
71-first embodiment of negative electrode sheet
72-second embodiment of negative plate
73-third example of negative electrode sheet
74-fourth embodiment of negative plate
8-positive plate
801-positive pole ear
802-porous current collecting positive electrode layer
803-conductive paste
804-Membrane
805-insulating sealing frame
Detailed Description
The invention will be further explained by embodiments in conjunction with the drawings.
Fig. 1 shows a wound lithium paste battery 1 according to the present invention, which includes a battery case 2, a positive electrode terminal 3, a negative electrode terminal 4, a battery cell 5, a liquid inlet 6, and an electrolytic solution. The battery cell 5 is disposed in the battery case 2, a plurality of positive electrode tabs of the battery cell 5 are electrically connected to the positive terminal 3, a plurality of negative electrode tabs of the battery cell 5 are electrically connected to the negative terminal 4, and the positive terminal 3 and the negative terminal 4 extend out of the battery case 2 and are in fluid sealing with the battery case 2. Electrolyte is injected into the battery case 2 through the injection port 6, and the battery cell 5 is placed in the electrolyte.
Fig. 2 and 3 show a cell 5 of a wound lithium paste battery according to the present invention, where the cell 5 includes a wound negative electrode tab 7 and a positive electrode tab 8. A positive pole tab 801 is arranged on one side or two sides of the positive pole piece 8; the negative electrode tab 701 is provided on one side or both sides of the negative electrode sheet 7, or the negative electrode tab is not provided. As shown in fig. 7, the negative electrode sheet 7 is formed by winding such that the negative electrode sheet includes a plurality of straight portions 702 and a plurality of bent portions 703, with a certain gap 704 formed between each straight portion. The respective positive electrode tabs 8 are disposed in the respective gap portions, respectively, to form a structure in which the positive electrode tabs and the negative electrode tabs are alternately stacked.
When a positive electrode tab is arranged on one side of each positive electrode sheet 8, a group of positive electrode tabs of the plurality of positive electrode sheets can be positioned on one side of the battery cell 5; when a plurality of negative electrode tabs are disposed on one side of the overall negative electrode sheet 7, the negative electrode tab 701 may be located on the same side of the battery cell 5 as the positive electrode tab or on the opposite side of the battery cell 5 from the positive electrode tab. In addition, when the two sides of each positive plate 8 are provided with positive electrode tabs, two groups of positive electrode tabs of the plurality of positive plates can be positioned on the two sides of the battery cell 5; at this time, when a plurality of negative electrode tabs are arranged on one side of the whole negative electrode plate 7, the negative electrode tab 701 may be located on one side of the battery cell 5 where the positive electrode tab is arranged, and when a plurality of negative electrode tabs are arranged on both sides of the whole negative electrode plate 7, the negative electrode tab 701 may be located on both sides of the battery cell 5 where the positive electrode tab is arranged. When the positive electrode tab is located on one side of the battery cell and the negative electrode tab is located on the other side of the battery cell (as shown in fig. 3), the ratio of the current conduction area to the electrode reaction area is large, the heat dissipation performance of the battery is improved, series and parallel connection between the batteries is facilitated, and meanwhile, the risk of short circuit caused by direct contact of the positive and negative terminals is avoided. In addition, the negative electrode tab may not be provided on the negative electrode sheet 7, and in this case, the porous structure 707 of the negative electrode sheet serves as a negative electrode current collector to collect current and is electrically connected to the negative electrode terminal 4 of the battery. The cathode plate is simple in structure, and time-saving and convenient to process.
An example of the assembled positive electrode sheet is shown in fig. 4. Among them, as shown in fig. 4 (a), the positive electrode sheet may include two porous current collecting positive electrode layers 802, a conductive paste 803, and two separators 804. A positive electrode cavity is formed between the two porous current collecting positive electrode layers 802 and is filled with conductive slurry 803, and part or all of the conductive slurry permeates into pores of the porous current collecting positive electrode layers 802 to form a sandwich composite positive electrode sheet. Two sides of the sandwich composite positive plate are provided with electronic insulating diaphragms 804 which are in close contact. In addition, as shown in fig. 4 (b), the sandwich composite positive electrode sheet includes a positive electrode tab 801, and an insulating sealing frame 805 is provided around the sandwich composite positive electrode sheet to prevent the conductive paste from leaking from four sides of the sandwich composite positive electrode sheet. The porous current collecting positive electrode layer 802 may be formed by coating a porous positive electrode material layer on one or both sides of a porous positive electrode current collector; or the porous current collecting positive electrode layer is a mixture of an electrode active material, a conductive agent and/or an adhesive and is fixed on the two sides of the isolation layer by casting, dipping or curtain coating, thermal spraying, brush coating or bonding, double-sided rolling and the like. The positive electrode tab may have other structures employed in the art as long as the positive electrode tab can be disposed in the gap 704 of the wound negative electrode tab. As shown in fig. 4 (b), the positive electrode sheet may be provided with only one positive electrode tab 801, or the positive electrode sheet may be provided with two positive electrode tabs and the two positive electrode tabs are located on opposite sides of the positive electrode sheet.
As shown in fig. 5, the negative electrode sheet includes a porous structure body 707 and a plurality of lithium-containing metal bodies 708 disposed on the porous structure body 707 in a spaced manner from each other such that each of the lithium-containing metal bodies 708 is respectively located in each of the straight portions 702 of the negative electrode sheet and is cross-stacked with the positive electrode sheet after the negative electrode sheet is wound. Here, the negative electrode sheet may include two layers of porous structures 707 and the lithium-containing metal body 708 disposed between the two layers of porous structures 707 (as shown in fig. 5 (a)), or the negative electrode sheet may include one layer of porous structures 707 and the lithium-containing metal body 708 disposed at corresponding positions on both sides of the porous structures 707 (as shown in fig. 5 (b)). The lithium-containing metal body is fixed to the porous structure by welding, spraying, bonding, electrochemical plating, electroless plating, mechanical press-fitting, or the like. In addition, for example, when lithium powder or lithium-containing metal powder is attached to the porous structure 707 by spraying or the like to form the lithium-containing metal body 708, particles of the lithium powder or lithium-containing metal powder may penetrate into the inside of the porous structure 707, the cross-sectional structure of which is shown in fig. 5 (c). It should be noted here that although (c) in fig. 5 shows that the lithium-containing metal body 708 protrudes from both sides of the porous structure body, it is to be understood that the lithium-containing metal body 708 may be entirely disposed inside the lithium-containing metal body 707 without protruding from the surface of the porous structure body here, that is, disposed inside the porous structure body when the negative electrode sheet includes one layer of the porous structure body. The lithium-containing metal body is a lithium-containing negative electrode material layer with a thickness of 0.02-2 mm. The lithium-containing negative electrode material layer is made of metal lithium, high-lithium alloy or lithium-rich inorganic non-metallic material. The porous structure body of the negative plate is an electronic conducting layer with the thickness of 0.01-1000 mu m, the porosity of a through hole is 50-95%, the average pore diameter is 1-500 mu m, and the material of the porous structure body comprises copper, stainless steel, nickel, titanium, silver, tin-plated copper, nickel-plated copper and silver-plated copper, preferably copper; further, the surface of the porous structure body is coated with a conductive carbon material coating or compounded with metal lithium in a pressing or electrochemical plating mode. Or the porous structure body is a porous organic material which is formed by mixing carbon fiber conductive cloth, metal wires and organic fiber wires, or by coating a conductive carbon material coating on the surface of the conductive cloth or plating a metal film on the surface of the conductive cloth, wherein the porous organic material comprises natural cotton and hemp, terylene, aramid fiber, nylon, polypropylene, polyethylene, polytetrafluoroethylene and other organic matters with good electrolyte resistance.
As shown in fig. 6, the negative electrode tab may be provided with a negative electrode tab ((a) - (c) in fig. 6) or not provided with a negative electrode tab ((d) in fig. 6). When the negative electrode tab is provided, the negative electrode tab and the negative electrode tab 701 may be integrally formed, and the negative electrode tab may also be connected to the negative electrode tab by welding, bonding, or the like. The anode tab 701 may be provided only on one side of the overall negative electrode sheet (as shown in (a), (b) of fig. 6), or the anode tab 701 may be provided on both sides of the overall negative electrode sheet (as shown in (c) of fig. 6). When the positive plate and the negative plate are collected at the same side, the widths of the positive tab and the negative tab are set to be narrower, so that the positive tab and the negative tab 701 can be led out at the same side. When the positive plate and the negative plate collect current on two sides, the widths of the positive tab and the negative tab can be set to be wider, and the positive tab and the negative tab 701 are respectively led out from two sides of the battery cell 5. When the negative electrode tabs 701 are disposed on both sides of the negative electrode sheet, the arrangement of the negative electrode tabs on both sides may be corresponding, or the arrangement of the negative electrode tabs on both sides may not be corresponding. As shown in (d) of fig. 6, when the negative electrode tab is not provided, an end portion 709 of the porous structure of the negative electrode sheet, as shown by a dotted line portion, serves as the negative electrode tab of the negative electrode sheet.
As shown in fig. 7 to 10, the flat-type integral negative electrode sheet 7 is wound.
Fig. 7 shows a first embodiment 71 of a negative electrode sheet according to the present invention. The negative electrode sheet is spirally wound, and is divided into a plurality of straight portions 702 and a plurality of bent portions 703. A gap 704 for accommodating the positive electrode tab is formed between the respective linear portions, and the width of the gap is equal to or greater than the thickness of the positive electrode tab. The number of gaps 704 is determined according to the number of positive plates to be inserted. A gap 706 is also formed between the curved portions 703, and the width of the gap 706 may be the same as or different from the width of the gap 704 of the linear portion 702. The length of the straight portion 702 is equal to or greater than the width of the positive electrode tab.
Fig. 8 shows a second embodiment 72 of a negative electrode tab according to the present invention. The negative electrode sheet of this second embodiment is substantially similar in structure to the negative electrode sheet of the first embodiment, except that a gap 704 is left only between each straight portion 702 of the negative electrode sheet, and no gap is left between each bent portion 703 of the negative electrode sheet, when the negative electrode sheet is wound. This can make the mass flow more even, and the thermal uniformity is better.
Fig. 9 shows a third embodiment 73 of a negative electrode sheet according to the present invention. The negative electrode sheet is wound in an arcuate manner, dividing the negative electrode sheet into a plurality of linear portions 702 and curved portions 703. A gap 704 for accommodating the positive electrode tab is formed between the respective linear portions, and the width of the gap is equal to or greater than the thickness of the positive electrode tab. The number of gaps 704 is determined according to the number of positive plates to be inserted. The straight portions 702 are substantially the same length and equal to or greater than the width of the positive electrode sheet.
Fig. 10 shows a fourth embodiment 74 of a negative electrode tab according to the present invention. The negative electrode sheet of this fourth example is substantially similar in structure to the negative electrode sheet of the third example, except that the length of the two outermost straight portions 7010 located at the outermost sides of the negative electrode sheet is greater than the length of the straight portion 702 at the middle portion when the negative electrode sheet is wound. Further, the length of the outermost straight portion 7010 of the negative electrode tab is greater than or substantially equal to the sum of the length of the middle straight portion 702 and the height of the battery cell 5. As shown in fig. 11, the outermost straight line portion 7010 is bent to form an outermost horizontal straight line portion 7011 and an outermost vertical straight line portion 7012, and the outermost vertical straight line portion 7012 is in contact with each bent portion 703 of the negative electrode sheet. This can make the mass flow more even, and the thermal uniformity is better. When the negative electrode sheet is wound an even number of times, the two outermost straight portions 7010 face the opposite sides, and at this time, the two outermost straight portions may be bent respectively and brought into contact with the bent portions 703 located on both sides of the battery cell 5, that is, the outermost vertical straight portion 7012 of one outermost straight portion 7010 is brought into contact with each bent portion 703 located on one side of the battery cell 5 and the outermost vertical straight portion 7012 of the other outermost straight portion 7010 is brought into contact with each bent portion 703 located on the other side of the battery cell 5. If the length of the outermost straight part 7010 is greater than the sum of the length of the straight part in the middle and the height of the battery cell, the end of the outermost vertical straight part 7012 formed after bending the outermost straight part will protrude outward from the battery cell, and the end of the protruding outermost vertical straight part can be used as a negative current collector and a negative electrode tab of the negative electrode tab. When the negative electrode sheet is wound for odd times, the outer end portions of the two outermost straight portions 7010 face the same side, one outermost straight portion 7010 may be bent and brought into contact with the bent portion 703 located on one side of the battery cell 5, and the other outermost straight portion 7010 may serve as a negative electrode tab of the negative electrode sheet. This eliminates the need for a negative tab on the negative plate. Thereby reducing the processing difficulty and improving the processing efficiency.
The negative electrode sheet 7 is formed in a wound manner. Wherein the negative electrode sheet may be wound around the positive electrode sheet 8. That is, the positive electrode sheet 8 is first provided on the straight portion 702 of the negative electrode sheet, and then the negative electrode sheet is wound around the positive electrode sheet to form the curved portion 703 and the further straight portion 702. And winding the negative electrode sheets around the plurality of positive electrode sheets in a manner that the positive electrode sheets and the negative electrode sheets are alternately superposed, and finally completing the complete winding of the negative electrode sheets. Note that the negative electrode sheet may be wound in advance to form a plurality of straight portions 702 and a plurality of bent portions 703, and after the negative electrode sheet is completely wound, each positive electrode sheet may be disposed in each gap 704 located between the straight portions 702 of the negative electrode sheet. The winding mentioned above may be spiral winding or may be arcuate winding, as well as other winding forms.
The specific embodiments of the present invention are not intended to be limiting of the invention. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (9)
1. A negative electrode sheet for a lithium paste battery, wherein the negative electrode sheet is formed with a plurality of straight portions and a plurality of bent portions by winding, the winding is spirally wound or arcuately wound, a gap for receiving a positive electrode sheet of the lithium paste battery is formed between the respective straight portions, the gap has a width equal to or greater than the thickness of the positive electrode sheet, and the straight portions have a length equal to or greater than the width of the positive electrode sheet, wherein the negative electrode sheet comprises a porous structure body and a plurality of lithium-containing metal bodies connected to the porous structure body in a spaced manner such that the respective lithium-containing metal bodies are respectively located in the respective straight portions of the negative electrode sheet after the negative electrode sheet is wound,
wherein when the negative electrode sheet is spirally wound, the bent portions on one side of the straight portion are in contact with each other, and the bent portions on the other side of the straight portion are also in contact with each other; alternatively, the first and second electrodes may be,
when the negative electrode sheet is wound in an arched manner, the negative electrode sheet comprises two outermost straight parts which are positioned on the outermost sides of the negative electrode sheet, the length of each outermost straight part is greater than or equal to the sum of the length of a straight part of a middle part and the height of a battery cell, and the two outermost straight parts form an outermost horizontal straight part and an outermost vertical straight part through bending, wherein one outermost vertical straight part is in electrical contact with each bent part positioned on one side of the negative electrode sheet, and the other outermost vertical straight part is in electrical contact with each bent part positioned on the other side of the negative electrode sheet; alternatively, the first and second electrodes may be,
when the negative electrode sheet is wound in an arched manner, the negative electrode sheet comprises two outermost straight parts which are positioned on the outermost sides of the negative electrode sheet, the length of each outermost straight part is greater than or equal to the sum of the length of the straight part of the middle part and the height of the battery cell, one outermost straight part forms an outermost horizontal straight part and an outermost vertical straight part through bending, the outermost vertical straight parts are in electric contact with the bent parts on one side of the negative electrode sheet, and the other outermost straight part is used as a negative electrode tab of the negative electrode sheet.
2. The negative electrode sheet for a lithium paste battery according to claim 1, wherein the negative electrode sheet comprises two layers of porous structures and the lithium-containing metal body is disposed between the two layers of porous structures, or the negative electrode sheet comprises one layer of porous structures and the lithium-containing metal body is disposed at corresponding positions on both sides of the porous structures, or the negative electrode sheet comprises one layer of porous structures and the lithium-containing metal body is disposed inside the porous structures.
3. The negative electrode sheet for a lithium paste battery according to claim 1 or 2, wherein the lithium-containing metal body is fixed to the porous structure by welding, spraying, bonding, electrochemical plating, electroless plating, or mechanical press-fitting.
4. The negative electrode sheet for a lithium paste battery according to claim 1 or 2, wherein the lithium-containing metal body is a lithium-containing negative electrode material layer having a thickness of 0.02 to 2mm, and the lithium-containing negative electrode material layer is metallic lithium or a high lithium alloy.
5. The negative electrode sheet for a lithium paste battery according to claim 1 or 2, wherein the porous structure is an electron conductive layer having a thickness of 0.01 to 1000 μm, a through-hole porosity of 50 to 95%, and an average pore diameter of 1 to 500 μm, and the porous structure is made of a material including copper, stainless steel, nickel, titanium, silver, tin-plated copper, nickel-plated copper, or silver-plated copper;
or the porous structure body is a porous organic material which is formed by mixing carbon fiber conductive cloth, metal wires and organic fiber wires, or coating a conductive carbon material coating on the surface of the conductive cloth or plating a metal film, and the porous organic material comprises natural cotton hemp, terylene, aramid fiber, nylon, polypropylene, polyethylene or polytetrafluoroethylene.
6. The negative electrode sheet for a lithium paste battery according to claim 1 or 2, wherein the porous structure is an electron conductive layer having a thickness of 0.01 to 1000 μm, a through-hole porosity of 50 to 95%, and an average pore diameter of 1 to 500 μm, the porous structure is made of a material including copper, stainless steel, nickel, titanium, silver, tin-plated copper, nickel-plated copper, or silver-plated copper, and a surface of the porous structure is coated with a conductive carbon material coating or compounded with metallic lithium by means of press-fitting or electrochemical plating.
7. The negative electrode sheet for a lithium paste battery according to claim 1 or 2, wherein a plurality of negative electrode tabs are provided on one side edge or opposite side edges of the negative electrode sheet, the negative electrode tabs being located in the respective straight portions of the negative electrode sheet after the negative electrode sheet is wound.
8. A battery cell comprising the negative electrode tab for a lithium paste battery and the positive electrode tab for a lithium paste battery of claim 1, the positive electrode tab being disposed in the gap formed between the straight portions of the negative electrode tab to form a structure in which the negative electrode tab and the positive electrode tab are cross-stacked.
9. A lithium paste battery comprising the electrical core of claim 8, a battery casing, a positive terminal, a negative terminal, an injection port, and an electrolyte, wherein the electrical core is disposed in the battery casing, the positive tab of the electrical core is electrically connected to the positive terminal, the negative tab of the electrical core is electrically connected to the negative terminal, the positive and negative terminals extend from the battery casing and are fluidly sealed to the battery casing, and the injection of the electrolyte into the battery casing through the injection port causes the electrical core to be disposed in the electrolyte.
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| CN110504497B (en) * | 2018-05-18 | 2021-07-16 | 北京好风光储能技术有限公司 | Connecting device for maintaining and regenerating slurry battery and slurry battery system |
| CN109741968B (en) * | 2018-12-29 | 2020-12-22 | 西安西电电力电容器有限责任公司 | Hybrid super capacitor battery based on nano-modified composite material electrode and manufacturing method thereof |
| CN110010841B (en) * | 2019-03-26 | 2021-03-23 | 深圳欣旺达智能科技有限公司 | Manufacturing process of positive and negative electrode plates of battery cell and battery cell electrode plate |
| CN111786001B (en) * | 2019-04-04 | 2022-05-27 | 北京好风光储能技术有限公司 | Device and method for spin-drying and soaking cylindrical battery cell |
| CN110936010B (en) * | 2019-10-25 | 2021-12-14 | 合肥国轩高科动力能源有限公司 | Method for welding composite current collector tabs of lithium battery |
| CN111193074B (en) * | 2019-12-11 | 2021-06-29 | 国网经济技术研究院有限公司 | Detachable lithium slurry battery's compound unit and contain its lithium slurry battery |
| CN114628689B (en) * | 2020-12-10 | 2023-11-14 | 好风光储能技术(成都)有限公司 | Porous current collector and battery adopting same |
| CN113097435A (en) * | 2021-03-31 | 2021-07-09 | 珠海冠宇电池股份有限公司 | Electrode plate and battery |
| US11271212B1 (en) * | 2021-04-02 | 2022-03-08 | Ses Holdings Pte. Ltd. | Anode fabrication by pattern lamination, anodes made thereby, and electrochemical devices incorporating such anodes |
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Effective date of registration: 20220407 Address after: 211111 2-210, u Valley lobby, No. 12, mozhou East Road, Jiangning District, Nanjing City, Jiangsu Province (future science and technology city) Patentee after: Nanjing Jingyu Energy Co.,Ltd. Address before: 100085 1711, 17th floor, building 5, courtyard 1, Shangdi 10th Street, Haidian District, Beijing Patentee before: Beijing Hawaga Power Storage Technology Co.,Ltd. |