CN113437301A - Composite pole piece, solid-state lithium ion battery pack and battery production process - Google Patents
Composite pole piece, solid-state lithium ion battery pack and battery production process Download PDFInfo
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- CN113437301A CN113437301A CN202110617272.6A CN202110617272A CN113437301A CN 113437301 A CN113437301 A CN 113437301A CN 202110617272 A CN202110617272 A CN 202110617272A CN 113437301 A CN113437301 A CN 113437301A
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- 239000002131 composite material Substances 0.000 title claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims description 40
- 229910001416 lithium ion Inorganic materials 0.000 title claims description 40
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 42
- 239000013543 active substance Substances 0.000 claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 14
- 239000003792 electrolyte Substances 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 238000010030 laminating Methods 0.000 claims description 9
- 239000007773 negative electrode material Substances 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 7
- 239000007774 positive electrode material Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 4
- 239000011889 copper foil Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 3
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 238000009960 carding Methods 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- 229910003002 lithium salt Inorganic materials 0.000 claims description 3
- 159000000002 lithium salts Chemical class 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 description 12
- 238000005253 cladding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 210000002489 tectorial membrane Anatomy 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention belongs to the technical field of lithium batteries, and relates to a composite pole piece, a battery pack made of the composite pole piece and a battery pack production process. The composite pole piece comprises a positive pole piece and a negative pole piece which are directly connected in series, wherein the negative pole piece comprises a negative pole current collector and a negative pole active substance coated on the surface of the negative pole current collector, the positive pole piece comprises a positive pole current collector and a positive pole active substance coated on the surface of the positive pole current collector, the surfaces of the positive pole active substance and the negative pole active substance are coated with a solid electrolyte, and no active substance or solid electrolyte is covered in the series connection area of the positive pole piece and the negative pole piece. This composite pole piece is directly established ties the mass flow body of positive plate and negative pole piece, compares with the pole piece of current independent form, and this composite pole piece has saved narrower traditional utmost point ear, and the current is direct to be transmitted to the negative pole mass flow body from the anodal mass flow body, and guarantees that composite pole piece has sufficient current carrying capacity.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a composite pole piece, a solid-state lithium ion battery pack and a battery pack production process.
Background
The solid-state lithium ion battery does not contain electrolyte, and compared with the traditional lithium ion battery, the solid-state lithium ion battery has the advantages of obvious high safety performance, high energy density and the like. However, the conventional solid-state lithium ion battery has a structure similar to that of the liquid-state lithium ion battery, and includes a set of positive electrode sheet and negative electrode sheet, and the positive and negative electrode sheets are stacked in multiple layers or wound to form battery cells with different capacities. For avoiding the short circuit, the width of anodal utmost point ear and negative pole utmost point ear can not exceed half of pole piece width, and in actual production, utmost point ear width is less than the pole piece width far away, and this can lead to the electric current of positive plate to concentrate on utmost point ear department, and too big electric current leads to the temperature rise here, takes place utmost point ear fusing even. Because the width of the tab is in the upper limit of the design, the design of current bearing is satisfied by ensuring enough tab sectional area, so thinner positive and negative current collectors cannot be used.
The polar ear and the polar ear which are subjected to current convergence in the battery cell in a pole piece superposition or winding mode are connected with the external positive and negative electrodes of the battery cell, and the external positive and negative electrodes of the battery cell are connected with each other by wires to realize series connection or parallel connection of the battery cell monomers so as to realize any combination of capacity and voltage.
The battery pack of the existing pole piece connection mode comprises the volume of an active material part which can effectively exert energy and the volume which can not exert energy, such as the volume of a connecting part of a pole lug, a positive pole and a negative pole and a connecting strip. The effective energy volume ratio is low, connecting parts and processes need to be added to realize series connection and parallel connection of the battery cells, and the process is complex and low in efficiency.
Disclosure of Invention
One object of the present invention is to provide a composite electrode sheet, which connects the current collectors of the positive electrode sheet and the negative electrode sheet in series, and compared with the existing electrode sheet in an independent form, the composite electrode sheet omits a narrower conventional tab, the current is directly transmitted from the positive current collector to the negative current collector, and the composite electrode sheet is ensured to have sufficient current carrying capacity.
In order to achieve the above object, the present invention provides a composite electrode sheet, which comprises a negative electrode sheet and a positive electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material coated on the surface of the positive electrode current collector, and a solid electrolyte is coated on the surface of the positive electrode active material and/or the negative electrode active material; one side of the negative current collector and one side of the positive current collector are both reserved with a series connection area, the series connection area is not covered by active materials and solid electrolytes, and the negative current collector and the positive current collector are connected in series through the series connection area.
In the technical scheme, the edges of the positive current collector and the negative current collector are directly connected in series, the positive current collector and the negative current collector are used as current transmission media, and the current collectors have large cross-sectional areas, so that the current cannot be transited and converged, and the generated heat can be uniformly dispersed, so that the fusing phenomenon can be avoided; the adopted solid electrolyte is non-volatile and does not flow, so that no isolation structure is arranged in the composite pole piece, the weight of the battery can be reduced under the condition of avoiding short circuit of the electrodes, and the energy density is improved. In addition, through directly establishing ties the anodal mass flow body and the negative pole mass flow body, the pole piece no longer need reserve the utmost point ear of outside extension, and consequently the occupation space of this composite pole piece is littleer, and chooses for use the composite pole piece of a certain amount according to the demand to each composite pole piece can be realized the preparation to the group battery of certain capacity and voltage to the mode of anodal laminating negative pole piece is connected.
Preferably, negative pole piece and positive plate in the compound pole piece are tiling state and bilateral symmetry setting, and whole compound pole piece is the individual layer state, and the tandem area does not have the bending, not only can avoid compound pole piece to break, simultaneously, can superpose compound pole piece in the plane scope, make it form can hold among the gap or can laminate at other part surfaces or have the group battery of certain deformation performance.
Preferably, a preset lead is connected to the series connection area of the composite pole pieces, the voltage between the composite pole pieces can be acquired through the preset lead, and meanwhile, the voltage between the single composite pole pieces can be acquired, so that the health state of the composite pole pieces can be detected conveniently.
Preferably, the front and the back of the positive and the negative active materials are coated with solid electrolyte, the solid electrolyte has viscosity, and the surface of the solid electrolyte is covered with a protective film to protect the solid electrolyte from contacting impurities and ensure the activity of the solid electrolyte, and when the positive plate is attached to the negative plate, the protective film is removed, the double-sided solid electrolyte has higher viscosity, so that the positive plate and the negative plate which are adjacently overlapped have higher fixing strength, not only can prevent the dislocation or separation of the pole pieces, but also can ensure the close contact of the positive plate and the negative plate by the direct attachment of the solid electrolyte.
It is another object of the present invention to provide a solid state lithium ion battery having a higher current carrying capacity and improved weight and volumetric energy density.
In order to achieve the purpose, the invention provides a solid-state lithium ion battery pack, wherein the whole solid-state lithium ion battery pack is divided into a positive electrode end, a serial connection part and a negative electrode end, wherein the serial connection part comprises a plurality of composite pole pieces, the composite pole pieces extend along the length direction in a mode of alternately overlapping the positive electrode piece and the negative electrode piece, and the positive electrode piece and the negative electrode piece which are contacted are bonded through a solid electrolyte; one end of the series part is provided with a reserved positive plate, and the other end of the series part is provided with a reserved negative plate; the positive pole end includes a plurality of positive plates, and the negative pole end includes a plurality of negative pole pieces, and the positive plate of positive pole end and the crisscross stack of the negative pole piece that the series portion reserved, the negative pole piece of negative pole end and the crisscross stack of the positive plate that the series portion reserved.
In the technical scheme, the battery pack adopts the composite poles in which the positive pole pieces and the negative pole pieces are directly connected in series, and the composite pole pieces are connected in a mode of superposing the positive pole pieces and the negative pole pieces, so that the whole width of the internal pole pieces is used as the current bearing width between the monomers, and the current collector conductive cross section is utilized to the maximum extent. Under the condition of same rate discharge, the current collector thickness can be reduced by more than% than the current collector thickness of the traditional lithium battery, the volume and the weight of the current collector can be effectively reduced, and the weight and the volume energy density of the battery pack are improved. In addition, the solid electrolyte is adopted in the solid lithium ion battery pack, and the solid electrolyte has no volatility and fluidity, so that a structure for isolating positive and negative electrode active substances and the electrolyte is not required to be arranged in the used composite pole pieces, and a diaphragm is not required to be used between the adjacent pole pieces, so that the quality of the inactive substances is reduced, and the production process of the battery pack can be simplified. Because the battery pack with the structure has no liquid substance inside and no liquid injection process, the battery pack can be produced into a finished long section (coil), and then the battery pack can be cut into a proper length according to the use requirement.
Preferably, the positive current collector of all positive plates in the positive terminal has the positive pole reservation portion that outwards extends, these positive pole reservation portions superpose together and form positive pole utmost point ear, the negative current collector of all negative plates in the negative terminal has the negative pole reservation portion that outwards extends, these negative pole reservation portions superpose together and form negative pole utmost point ear, positive pole utmost point ear and the negative pole utmost point ear that are formed by positive current collector and negative current collector have the same width with compound pole piece, and have bigger electrically conductive cross section, it can be with the electric current dispersion of positive plate pole piece in the whole width range of utmost point ear to this avoids utmost point ear temperature sharply rising, thereby prevent that utmost point ear from taking place the fusing.
Preferably, this solid-state lithium ion battery pack's outmost surrounding layer that blocks water, negative pole utmost point ear and anodal utmost point ear and preset wire pass this surrounding layer that blocks water, both guarantee that the battery is inside to be in good operational environment, and simultaneously, the surrounding layer that blocks water can increase the structural strength of whole group battery to restraint superimposed compound pole piece, make and keep good contact between the compound pole piece.
One object of the present invention is to provide a battery pack production process, in which a composite pole piece is obtained by changing the pole piece production process, the production process of the battery pack is simplified on the basis of the composite pole piece, the safety of the battery pack is improved, the current carrying capacity of the pole piece is improved, and meanwhile, unnecessary connection structures are removed to effectively reduce the volume and weight of a current collector, and the weight and volume energy density of the battery pack are improved.
In order to achieve the above object, the present invention provides a process for producing a solid-state lithium ion battery pack, which mainly comprises the following steps:
and 9, packaging, namely placing the battery pack in an outer coating (an aluminum plastic film or an aluminum shell or a plastic shell), carding preset leads of each composite pole piece to form a data acquisition harness, and penetrating the acquisition harness, the positive pole lug and the negative pole lug through the outer coating for sealing treatment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic front structural diagram of a composite plate in a solid-state lithium ion battery pack provided by the present invention;
FIG. 2 is a schematic structural diagram of a solid-state lithium-ion battery pack according to the present invention;
fig. 3 is a schematic diagram of an s-shaped distribution structure of a solid-state lithium ion battery pack according to the present invention.
In the figure, a positive current collector 1, a negative current collector 2, a positive active material 3, a negative active material 4, a solid electrolyte layer 5, a preset lead 6, a series connection region 7, a negative plate 8, a positive plate 9, a negative plate tab 10, a positive plate tab 11, an outer cladding layer 12 and a connecting strip 13.
Detailed Description
Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
Fig. 1 shows an embodiment of the present invention, which is a composite electrode sheet, the composite electrode sheet includes a negative electrode sheet 8 and a positive electrode sheet 9, wherein the negative electrode sheet 8 includes a negative electrode current collector 2 and a negative electrode active material 4 coated on a surface of the negative electrode current collector 2, the positive electrode sheet 9 includes a positive electrode current collector 1 and a positive electrode active material 3 coated on a surface of the positive electrode current collector 1, and a solid electrolyte is coated on surfaces of the positive electrode active material 3 and the negative electrode active material 4. In addition, set up series connection district 7 in the left side of negative pole mass flow body 2 and the right side of anodal mass flow body 1 all reserves, and this series connection district 7 adopts laser welding, and no active material and solid-state electrolyte cover to accomplish the series connection of negative pole mass flow body 2 and anodal mass flow body 1, finally obtain negative pole piece 8 and positive plate 9 and be the tiling state and the compound machine piece that bilateral symmetry set up. The solid electrolyte is used in the composite pole piece, so that the insulating material for isolating the electrolyte is not required to be arranged in the series connection area 7, the width of the series connection area can be reduced, and the preset lead 6 can be arranged in the series connection area (when the battery pack made of the negative pole pieces is used, the voltage of the single pole piece can be tested through the preset lead 6).
This compound pole piece compares with current pole piece, it does not have the utmost point ear of reserving, through come to realize the series connection between the compound pole piece with the laminating of negative pole piece, and bind through having sticky solid state electrolyte between positive plate and the negative pole piece, in order to ensure closely to laminate between the pole piece, all coat solid state electrolyte at positive active material 3 and negative active material 4's front and back, and carry out the tectorial membrane to the compound pole piece of production, protect solid state electrolyte through the protection film, with the solid state electrolyte of protection can not contact impurity, guarantee its good activity and viscidity.
In the composite sheet with the structure, the positive current collector 1 and the negative current collector 2 are directly connected in series through the series connection region 7, at the moment, the positive current collector 1 and the negative current collector 2 are used as current transmission media, and the current collectors have larger cross-sectional areas, so that the current can be uniformly dispersed, and the generated heat can be uniformly dispersed, thereby avoiding the fusing phenomenon; the adopted solid electrolyte is non-volatile and does not flow, so that no isolation structure is arranged in the composite pole piece, the weight of the battery can be reduced under the condition of avoiding short circuit of the electrodes, and the energy density is improved. In addition, through directly establishing ties positive current collector 1 and negative current collector 2, the pole piece no longer need reserve the utmost point ear of outside extension, and consequently the occupation space of this composite pole piece is littleer, and chooses for use the composite pole piece of a certain amount according to the demand to each composite pole piece is connected to the mode of positive plate laminating negative pole piece can realize the preparation to the group battery of certain capacity and voltage.
As shown in fig. 2, the present invention provides an embodiment of a solid-state lithium ion battery fabricated by using the above composite pole piece, which has a higher current carrying capacity and improved weight and volumetric energy density.
Specifically, the whole solid-state lithium ion battery pack is divided into a positive electrode end on the right side, a series connection part and a negative electrode end on the left side, wherein the series connection part comprises a plurality of composite pole pieces, the composite pole pieces are provided with three layers and extend in a mode that the positive electrode pieces and the negative electrode pieces are overlapped in a staggered mode from left to right, and the positive electrode pieces and the negative electrode pieces which are in contact with each other are bonded through solid-state electrolyte. As shown in fig. 2, in the thickness direction, the uppermost layer and the lowermost layer of the serial connection portion respectively have a layer of composite pole pieces facing each other, the composite pole pieces are divided into a plurality of pole piece groups, each pole piece group comprises a composite pole piece at the uppermost layer and a composite pole piece at the lowermost layer, the plurality of pole piece groups are horizontally arranged along the length direction, the adjacent pole piece groups are connected through a complete middle composite pole piece, according to the connection mode of overlapping the positive pole pieces and the negative pole pieces, the negative pole piece of the middle composite pole piece is sandwiched between the two positive pole pieces of the right pole piece group, and the positive pole piece 9 is sandwiched between the two negative pole pieces of the left pole piece group; for the connection of the middle composite pole pieces at the two ends of the serial connection part, a positive pole piece 9 is reserved at the right end, and a negative pole piece 8 is reserved at the left end.
The upper part is provided with a positive electrode end, the positive electrode end comprises two positive electrode plates 9 positioned at the uppermost layer and the lowermost layer, and the two positive electrode plates 9 clamp a negative electrode plate 8 reserved at the right end of the serial connection part; the negative electrode end comprises two negative electrode sheets 8 positioned at the uppermost layer and the lowermost layer, and the two negative electrode sheets 8 clamp a positive electrode sheet 9 reserved at the left end of the serial connection part. And the positive current collector 1 of two positive plates 9 in the positive terminal has the anodal reservation portion that outwards extends, these anodal reservation portions superpose together and form anodal utmost point ear 11, the negative current collector 2 of two negative plates in the negative pole end has the negative pole reservation portion that outwards extends, these negative pole reservation portions superpose together and form negative pole utmost point ear 10, anodal utmost point ear and the negative pole utmost point ear that form by positive current collector 1 and negative current collector have the same width with compound pole piece, and have bigger electrically conductive cross section, it can be with the electric current dispersion of positive plate pole piece in the whole width scope of utmost point ear, with this avoid utmost point ear temperature sharply to rise, thereby prevent that utmost point ear from taking place the fusing.
The above shows the connection structure of the pole pieces of the solid-state lithium ion battery pack, and the outermost layer of the whole battery pack is provided with the water-blocking outer cladding 12 (such as an aluminum plastic film, an aluminum shell or a plastic shell), the negative pole lug 10, the positive pole lug 11 and the preset wire 6 penetrate through the water-blocking outer cladding 12, so that the inside of the battery is ensured to be in a good working environment, meanwhile, the water-blocking outer cladding can increase the structural strength of the whole battery pack, and the superposed composite pole pieces are restrained, so that the composite pole pieces are kept in good contact.
Based on the solid-state lithium ion battery pack with the structure, the battery pack has good plasticity and can be made into a roll shape, the battery pack can also be made into an S shape as shown in fig. 3, the S-shaped battery pack has three rows, the three rows are connected through connecting strips 13 (copper foils or aluminum foils), and the battery packs which are more in line with the use requirements and the use scenes can be manufactured by reasonably arranging the number of pole pieces and the total row number of each row.
In conclusion, the whole width of the inner pole piece of the battery pack based on the composite pole piece is used as the current bearing width between the single bodies, and the conductive cross section of the current collector is utilized to the maximum extent. Under the condition of same rate discharge, the current collector thickness can be reduced by more than 50% compared with the traditional lithium battery current collector thickness, the volume and the weight of the current collector can be effectively reduced, and the weight and the volume energy density of the battery pack are improved. In addition, the solid electrolyte has no volatility and fluidity, so that a structure for isolating the electrolyte is not required to be arranged in the used composite pole pieces, and a diaphragm is not required to be used between the adjacent pole pieces, so that the quality of inactive substances is reduced, the production process of the battery pack can be simplified, the battery pack can be produced into a long section (coil), and then the battery pack is cut into a proper length according to the use requirement.
The traditional solid-state lithium ion battery pack is composed of a positive plate and a negative plate with tabs, the solid-state lithium ion battery pack in the application adopts a composite pole piece, the composite pole piece is connected in a mode of series connection inside the pole piece, the production process of the composite pole piece is different from that of the existing pole piece, and the production process of the lithium ion battery pack is also different from that of the existing process due to the change of the structure. Specifically, the production process of the solid-state lithium ion battery pack mainly comprises the following steps:
and 7, welding the serial connection region 7 of the positive current collector in the positive end to form a positive electrode tab, and welding the serial connection region of the negative current collector in the negative end to form a negative electrode tab.
And 8, trimming, namely compressing the battery pack by using the pressure of 0.1-2 MPa, and keeping for 40S, so that the solid electrolyte mixed substance is fully contacted with the positive and negative active substances of the composite pole piece.
And 9, packaging, namely placing the battery pack in an outer coating (an aluminum plastic film or an aluminum shell or a plastic shell), carding preset leads of each composite pole piece to form a data acquisition harness, and penetrating the acquisition harness, the positive pole lug and the negative pole lug through the outer coating for sealing treatment.
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
It is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A composite pole piece is characterized in that: the composite pole piece comprises a negative pole piece and a positive pole piece, wherein the negative pole piece comprises a negative pole current collector and a negative pole active substance coated on the surface of the negative pole current collector; one side of the negative current collector and one side of the positive current collector are both reserved with a series connection area, the series connection area is not covered by active materials and solid electrolytes, and the negative current collector and the positive current collector are connected in series through the series connection area.
2. A composite pole piece according to claim 1, wherein: the negative plate and the positive plate in the composite pole piece are in a tiled state and are arranged in a bilateral symmetry mode.
3. A composite pole piece according to claim 2, wherein: and a preset lead is electrically connected in the series connection area of the composite pole piece.
4. A composite pole piece according to claim 3, wherein: the front and back surfaces of the positive electrode active material and the negative electrode active material are coated with a solid electrolyte having viscosity, and the surface of the solid electrolyte is covered with a protective film.
5. A solid state lithium ion battery, characterized by: the whole solid-state lithium ion battery pack is divided into a positive end, a serial part and a negative end, wherein the serial part comprises a plurality of composite pole pieces according to claim 4, the composite pole pieces extend along the length direction in a mode of alternately overlapping the positive pole pieces and the negative pole pieces, and the positive pole pieces and the negative pole pieces which are contacted are bonded through a solid electrolyte; one end of the series part is provided with a reserved positive plate, and the other end of the series part is provided with a reserved negative plate; the positive pole end includes a plurality of positive plates, and the negative pole end includes a plurality of negative pole pieces, and the positive plate of positive pole end and the crisscross stack of the negative pole piece that the series portion reserved, the negative pole piece of negative pole end and the crisscross stack of the positive plate that the series portion reserved.
6. The solid state lithium ion battery of claim 5, wherein: the positive current collectors of all positive plates in the positive end are provided with positive pole reserved parts extending outwards, the positive pole reserved parts are overlapped together and form a positive pole lug, the negative current collectors of all negative plates in the negative end are provided with negative pole reserved parts extending outwards, and the negative pole reserved parts are overlapped together and form a negative pole lug.
7. The solid state lithium ion battery of claim 6, wherein: the outermost layer of the solid-state lithium ion battery pack is wrapped with an outer wrapping layer, and the cathode lug, the anode lug and a preset wire penetrate through the outer wrapping layer.
8. The solid state lithium ion battery of claim 6 or 7, wherein: the solid-state lithium ion battery pack is in a strip shape, and when the solid-state lithium ion battery pack is used, the battery pack with proper capacity and voltage is obtained by intercepting the length and the number of superposed layers according to needs.
9. A process for producing a solid state lithium ion battery of claim 8, comprising essentially the steps of:
step 1, manufacturing a positive current collector and a negative current collector, and reserving a series connection area; the positive current collector is made of an aluminum foil with the thickness of 5-15 mu m; the material of the negative current collector is a copper foil with the thickness of 5-15 mu m; the width of the series connection area is 1-5 mm; or the foil made of the same material is used as a positive current collector and a negative current collector, a series connection area is reserved in the middle, and the left side and the right side are respectively the positive current collector and the negative current collector;
step 2, coating positive active substances on two sides of a positive current collector, and coating negative active substances on the surface of a negative current collector, wherein the positive active substances comprise ternary materials of lithium iron phosphate, lithium manganate and nickel cobalt manganese, and the negative active substances comprise graphite, silicon carbon and metal lithium; ensuring that no active substance covers the serial connection area on the positive current collector and the negative current collector;
step 3, respectively coating the solid electrolyte on the positive electrode active substance and the negative electrode active substance, wherein the solid electrolyte at least comprises one layer, so as to obtain a positive electrode piece and a negative electrode piece, and ensure that no solid electrolyte covers the serial connection area on the positive electrode current collector and the negative electrode current collector; the solid electrolyte is a material which contains conductive high molecular material, conductive oxide material, lithium salt and the like and has lithium ion conduction; dispersing a lithium ion conductive material in NMP and electrolyte, wherein the solid content of the mixture is 20-50%, and the viscosity is 100-1000 mPa.s;
step 4, welding the serial connection area, welding the reserved areas of the positive and negative pole pieces together by adopting a laser welding or ultrasonic welding technology to prepare a composite pole piece, and ensuring that the interval between an active substance and a solid electrolyte between the positive and negative pole pieces on the composite pole piece is 1-3mm to prevent contact short circuit;
step 5, welding a preset lead 6 in the welded serial connection area by adopting a laser welding or ultrasonic welding technology, and ensuring that the preset lead 6 has enough extra length;
step 6, assembling, namely stacking the composite pole pieces prepared in the step 5 along the length direction in a mode that the positive pole pieces are attached to the negative pole pieces, forming a series connection part, and respectively arranging a reserved positive pole piece and a reserved negative pole piece at two ends of the series connection part; an independent positive plate is used for laminating and reserving a negative plate to form a positive end, and an independent negative plate is used for laminating and reserving a positive plate to form a negative end;
step 7, welding the serial connection area 7 of the positive current collector in the positive end to form a positive electrode tab, and welding the serial connection area of the negative current collector in the negative end to form a negative electrode tab;
step 8, trimming, namely compressing the battery pack by using the pressure of 0.1-2 MPa, and keeping the pressure for 30-120S, so that the solid electrolyte mixed substance is fully contacted with the positive and negative active substances of the composite pole piece;
and 9, packaging, namely placing the battery pack in an outer coating, carding preset wires of the composite pole pieces to form a data acquisition wire harness, and penetrating the acquisition wire harness, the positive pole lug and the negative pole lug through the outer coating for sealing treatment.
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