CN116315007A - Lamination cell structure and secondary battery - Google Patents

Lamination cell structure and secondary battery Download PDF

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Publication number
CN116315007A
CN116315007A CN202310112038.7A CN202310112038A CN116315007A CN 116315007 A CN116315007 A CN 116315007A CN 202310112038 A CN202310112038 A CN 202310112038A CN 116315007 A CN116315007 A CN 116315007A
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China
Prior art keywords
pole piece
active coating
positive
bipolar
negative
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CN202310112038.7A
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Chinese (zh)
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聂阳
徐雄文
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Hunan Nafang New Energy Technology Co ltd
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Hunan Nafang New Energy Technology Co ltd
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Priority to CN202310112038.7A priority Critical patent/CN116315007A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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)
  • Secondary Cells (AREA)

Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a laminated battery cell structure, which comprises a negative plate, one or more bipolar plates and a positive plate which are sequentially arranged, wherein a separation membrane is arranged between the negative plate and the bipolar plates, the separation membrane is arranged between the bipolar plates and the positive plate, the negative plate comprises a negative aluminum foil and a negative active coating arranged on at least one side of the negative aluminum foil, the positive plate comprises a positive aluminum foil and a positive active coating arranged on at least one side of the positive aluminum foil, the bipolar plates comprise an aluminum foil current collector, a positive active coating arranged on one side of the aluminum foil current collector and a negative active coating arranged on the other side of the aluminum foil current collector, the positive active coating in the bipolar plates is positioned on one side of the negative plate, the negative active coating in the bipolar plates is positioned on one side of the positive plate, and a separation membrane is arranged between two adjacent bipolar plates. The laminated cell structure has higher voltage.

Description

Lamination cell structure and secondary battery
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to a laminated cell structure and a secondary battery.
Background
Sodium ions are similar to the principle of lithium ion batteries, and are called as rocking chair batteries, the electrodes of which consist of a negative electrode plate and a positive electrode plate, and solvated ions shuttle between the positive electrode and the negative electrode which face to face. Because the positive current collector of the lithium ion battery uses aluminum foil, the negative current collector uses copper foil, and the lithium battery cells of the lamination process and the winding process can be regarded as parallel connection of multiple layers of cells, the voltage of the single cell is about 3V according to a material system, so that the voltage of the single cell cannot meet most of battery use scenes, and a plurality of cells are required to be connected in series to form a module to improve the total voltage.
1. For the use scene of small-size energy storage often needs tens of volts of charge-discharge use scenes, often the lithium cell needs a plurality of batteries to establish ties into the module, has enlarged the quality problem that the electric core uniformity difference brought on the one hand, and on the other hand the structure that the series connection used also takes up more space and weight.
2. The positive electrode and the negative electrode of the lithium ion battery have more severe requirements on the current collector material, and aluminum foil is used as a negative electrode to easily perform alloying reaction with lithium ions.
Therefore, a technical solution is needed to solve the above-mentioned problems of battery variability, weight and volume at high voltage, and pole piece alloying.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the laminated cell structure is provided, has higher voltage, does not need auxiliary components, has smaller volume and lighter weight, and can not cause alloying problem.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a lamination electricity core structure, includes negative pole piece, one or more bipolar pole piece and the positive pole piece that sets gradually, be provided with the barrier film between negative pole piece and the bipolar pole piece, be provided with the barrier film between bipolar pole piece and the positive pole piece, the negative pole piece includes negative pole aluminium foil and sets up the negative pole active coating in negative pole aluminium foil at least one side, the positive pole piece includes positive pole aluminium foil and sets up the positive pole active coating in positive pole aluminium foil at least one side, the bipolar pole piece includes the aluminium foil electric current collector, sets up the positive pole active coating in aluminium foil electric current collector one side and sets up the negative pole active coating in aluminium foil electric current collector opposite side, the positive pole active coating in the bipolar pole piece is located one side of negative pole piece, be provided with the barrier film between two adjacent bipolar pole pieces.
The conventional laminated battery cell structure has no bipolar pole piece, the system voltage is lower, the laminated battery cell structure of the embodiment comprises a negative pole piece, an isolating film, a bipolar pole piece, an isolating film and a positive pole piece, the system voltage can be increased by times due to the bipolar pole piece, so that the battery cell has higher voltage, external pole lugs are not required to be connected in series, the current is more uniform, the multiplying power performance is improved, and the battery cell matching problem caused by the series connection of a plurality of battery cells is reduced.
The separation membrane comprises a gel state separation membrane or a solid electrolyte separation membrane, wherein the gel state separation membrane comprises one of a gel state polypropylene membrane, a gel state polyethylene membrane and a gel state non-woven fabric membrane, and the solid electrolyte membrane comprises ceramic inorganic solid electrolyte or polymer solid electrolyte. The gel state isolating film comprises gel state electrolyte and a base film, and the base film is helpful for fixing the gel state electrolyte and avoiding short circuit caused by the flowing of the gel state electrolyte.
Wherein the thickness of the isolating film is 0.003-0.1 mm. The thickness and the material of the isolating film are set, and certain quality of the isolating film is kept. Preferably, the thickness of the release film is 0.003mm, 0.008mm, 0.01mm, 0.05mm, 0.08mm, 0.1mm.
Wherein the thickness of the aluminum foil current collector is 0.005-0.02 mm, the thickness of the positive electrode active coating in the bipolar pole piece is 0.01-0.5 mm, and the thickness of the negative electrode active coating in the bipolar pole piece is 0.01-0.5 mm. The bipolar pole piece is set to have a certain thickness, so that the battery maintains certain mechanical property and electrochemical property. The thickness of the bipolar pole piece cannot be too thick, and the thickness of the bipolar pole piece is too thin, so that the bipolar pole piece is kept to be a certain thickness and is not easy to damage. Preferably, the thickness of the aluminum foil current collector is 0.005mm, 0.008mm, 0.01mm, 0.015mm, 0.019mm, 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm. The thickness of the negative electrode active coating in the bipolar pole piece is 0.01mm, 0.04mm, 0.08mm, 0.12mm, 0.28mm, 0.34mm, 0.45mm and 0.5mm. The thickness of the positive electrode active coating in the bipolar pole piece is 0.01mm, 0.05mm, 0.08mm, 0.12mm, 0.15mm, 0.25mm, 0.35mm, 0.45mm and 0.5mm.
The outermost edge of the positive electrode active coating of the bipolar pole piece is surrounded by an insulating layer. The insulation layer is arranged on the periphery of the outermost edge of the positive electrode active coating of the bipolar electrode plate, so that the insulation performance of the bipolar electrode plate can be improved.
Wherein the insulating layer is made of one or more of polyvinyl chloride, polycarbonate, polymethyl methacrylate, polyurethane, polytetrafluoroethylene, butadiene rubber and styrene butadiene rubber.
The side length of the negative electrode active coating in the bipolar pole piece is 0.5-5 mm longer than that of the positive electrode active coating in the bipolar pole piece. The side length of the anode active coating is larger than that of the cathode active coating, namely the area of the anode active coating is larger than that of the cathode active coating, so that the anode active coating can provide a larger area for the cathode active coating.
Wherein the thickness of the negative aluminum foil in the negative plate is 0.01-0.2 mm, and the thickness of the negative active coating in the negative plate is 0.01-0.2 mm. Preferably, the thickness of the negative electrode aluminum foil in the negative electrode sheet is 0.01mm, 0.08mm, 0.15mm, 0.18mm, 0.2mm, and the thickness of the negative electrode active coating in the negative electrode sheet is 0.01mm, 0.08mm, 0.15mm, 0.18mm, 0.2mm.
Wherein the thickness of the positive aluminum foil in the positive plate is 0.01-0.2 mm, and the thickness of the positive active coating in the positive plate is 0.01-0.2 mm. Preferably, the thickness of the positive aluminum foil in the positive plate is 0.01mm, 0.08mm, 0.15mm, 0.18mm and 0.2mm; the thickness of the positive electrode active coating in the positive electrode plate is 0.01mm, 0.08mm, 0.15mm, 0.18mm and 0.2mm.
The negative electrode plate is provided with a tab, and the positive electrode plate is provided with a tab. According to the laminated battery cell structure, the positive electrode tab is arranged on the positive electrode plate, the negative electrode tab is arranged on the negative electrode plate, and the bipolar electrode plate does not show the positive electrode tab.
The second object of the present invention is: aiming at the defects of the prior art, a secondary battery with higher voltage is provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the secondary battery comprises electrolyte, a shell and the laminated cell structure, wherein one or more laminated cell structures are arranged, the laminated cell structures are electrically connected, and the shell is used for packaging the electrolyte and the laminated cell structure. The secondary battery can be a sodium ion battery, a potassium ion battery, a lithium ion battery, a calcium ion battery and the like, and is preferably suitable for sodium ion batteries or potassium ion batteries which can use aluminum foils as current collectors for both positive and negative plates.
The secondary battery can adopt the method of increasing the number of bipolar pole pieces between the positive electrode and the negative electrode so as to increase the battery voltage, wherein the cell unit voltage is determined by the positive electrode material voltage x and the bipolar pole piece layer number N, and the pole lugs are led out from the positive electrode pole piece and the negative electrode pole piece at the two ends, and the voltage is x multiplied by N volts; in order to ensure the consistency of the serial structure, the capacity of the positive electrode on each pole piece is equal. The secondary battery of the present invention may have a parallel structure so as to increase the battery capacity, and the secondary battery may be repeatedly stacked and connected in parallel according to the structure shown in fig. 2, requiring an expansion capacity. In order to prevent the problems of self discharge and liquid and gas channeling caused by the flowing of electrolyte in different positive and negative electrode pairs, an insulating layer is coated on the outer side of the positive electrode, and the electrolyte between the positive and negative electrodes is blocked between the positive and negative electrodes.
Wherein, the material of casing is one of stainless steel, plastic-aluminum membrane, aluminum plate. The stainless steel has good mechanical properties and can well play a role in protection; the aluminum plastic film has good plasticity, and the battery core can be processed and manufactured after being arranged on the aluminum plastic film, so that the battery core is matched with the shell, and the prepared secondary battery has better performance.
Compared with the prior art, the invention has the beneficial effects that: according to the laminated battery core structure, a plurality of auxiliary components for connecting the battery cores, such as a fluid bag, an elastic part, a sealing part and the like, are not required to be introduced, the structure of the single battery core is obviously simplified, the quality of the single battery core is reduced, the energy density of the single battery core is improved, the battery core matching problem caused by the serial connection of a plurality of battery cores is avoided, the components such as a shell, a tab, an empty foil and an adhesive tape which are required by the serial connection are reduced, the tab is not adopted for serial connection, the current is more uniform, the multiplying power performance is improved, and because the electrolyte is gel polymer electrolyte or solid electrolyte, a sealing device is avoided between every two basic units in the battery core.
Drawings
Fig. 1 is a schematic structural view of a laminated cell structure of the present invention.
Fig. 2 is a second schematic structural view of the laminated cell structure of the present invention.
Fig. 3 is a charge-discharge curve of the sodium ion battery of the present invention.
Fig. 4 is a schematic structural view of the bipolar pole piece of the present invention.
Wherein: 1. a negative electrode sheet; 2. a separation film; 3. bipolar pole pieces; 31. a positive electrode active coating; 32. a negative electrode active coating; 33. an insulating layer; 4. and a positive plate.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail below with reference to the drawings, but is not limited thereto.
Referring to fig. 1, a laminated battery cell structure of the first embodiment includes a negative electrode sheet 1, a separator 2, a bipolar electrode sheet 3, a separator 2 and a positive electrode sheet 4, the negative electrode sheet 1 includes a negative electrode aluminum foil and a negative electrode active coating 32 disposed on at least one side of the negative electrode aluminum foil, the positive electrode sheet 4 includes a positive electrode aluminum foil and a positive electrode active coating 31 disposed on at least one side of the positive electrode aluminum foil, the bipolar electrode sheet 3 includes an aluminum foil current collector, a positive electrode active coating 31 disposed on one side of the aluminum foil current collector and a negative electrode active coating 32 disposed on the other side of the aluminum foil current collector, the positive electrode active coating 31 in the bipolar electrode sheet 3 is disposed on one side of the negative electrode sheet 1, and the negative electrode active coating 32 in the bipolar electrode sheet 3 is disposed on one side of the positive electrode sheet 4.
Preferably, the material of the separator 2 is polypropylene. The thickness of the separator 2 was 0.05mm. The thickness of the aluminum foil current collector in the bipolar pole piece 3 is 0.01mm, the thickness of the positive electrode active coating 31 in the bipolar pole piece 3 is 0.15mm, the thickness of the negative electrode active coating 32 in the bipolar pole piece 3 is 0.15mm, the thickness of the negative electrode aluminum foil in the negative pole piece 1 is 0.15mm, the thickness of the negative electrode active coating 32 in the negative pole piece 1 is 0.15mm, the thickness of the positive electrode aluminum foil in the positive electrode piece 4 is 0.15mm, and the thickness of the positive electrode active coating 31 in the positive electrode piece 4 is 0.15mm. As shown in fig. 4, the side length of the negative electrode active coating 32 in the bipolar plate is 2mm longer than the side length of the positive electrode active coating 31 in the bipolar plate. The thickness of the insulating layer 33 on the same side as the anode active coating layer 32 is the same as the thickness of the anode active coating layer 32, and the thickness of the insulating layer 33 on the same side as the cathode active coating layer 31 is the same as the thickness of the cathode active coating layer 31. The insulating layer 33 is made of polyvinyl chloride.
Wherein, the laminated cell structure may include a plurality of bipolar pole pieces 3, and the number of the bipolar pole pieces 3 may be determined according to circumstances. Referring to fig. 2, when the laminated cell structure includes two bipolar electrode plates 3, the laminated cell structure sequentially includes, from top to bottom, a negative electrode plate 1, an isolating film 2, a bipolar electrode plate 3, an isolating film 2, a positive electrode plate 4, an isolating film 2, a bipolar electrode plate 3, an isolating film 2, and a negative electrode plate 1. And the laminated cell structure is a parallel structure.
The sodium ion battery comprises electrolyte, a shell and the laminated cell structure of the first embodiment, wherein the shell is used for mounting and packaging the electrolyte and the laminated cell structure. A sodium ion battery has a high voltage. The material of the shell of this embodiment is plastic-aluminum membrane.
The preparation method of the sodium ion battery comprises the following steps:
step one: sodium vanadium phosphate: the conductive carbon SP is coated on two sides of an aluminum foil in a mixing manner according to the mass ratio of 90:5:5, and the positive plate 4 is obtained through drying and rolling;
step two: from hard carbon: sodium alginate is mixed and coated on two sides of an aluminum foil according to the mass ratio of 90:10, and the negative plate 1 is obtained through drying and rolling;
step three: from hard carbon: sodium alginate is mixed and coated on one side of an aluminum foil according to the mass ratio of 90:10, and then sodium vanadium phosphate is prepared by the following steps: and the conductive carbon SP and polyvinylidene fluoride PVDF are mixed and coated on the other side of the aluminum foil according to the mass ratio of 90:5:5. Finally, coating a polytetrafluoroethylene insulating layer 33 on the outer ring of the positive electrode side, drying and rolling to obtain a bipolar pole piece 3;
step four: stacking the pole pieces according to the negative pole piece 1, the isolating film 2, the bipolar pole piece 3, the isolating film 2, the positive pole piece 4, the isolating film 2, the bipolar pole piece 3, the isolating film 2 and the negative pole piece 1 to obtain a bare cell, wherein positive pole lugs in the bare cell are connected with all the positive pole pieces 4, negative pole lugs are connected with all the negative pole pieces, and the bipolar pole piece 3 does not lead out the lugs;
step five: uniformly mixing ethylene carbonate, propylene carbonate, methyl ethyl carbonate and diethyl carbonate according to a mass ratio of 2:1:4:3 to prepare an organic solvent; then taking an organic solvent accounting for 85% of the total mass of the liquid mixed solution, adding polyethylene glycol diacrylate accounting for 1% of the total mass of the liquid mixed solution, polyethylene glycol diacrylate accounting for 1.5% of the total mass of the liquid mixed solution, methyl methacrylate accounting for 0.5% of the total mass of the liquid mixed solution, vinyl sulfite additive accounting for 0.3% of the total mass of the liquid mixed solution, adding an azodiisobutyronitrile initiator accounting for 0.2% of the total mass of the liquid mixed solution, slowly adding a mixture of sodium hexafluorophosphate and sodium difluorosulfimide to prepare a sodium salt solution of 1mol/L, wherein sodium hexafluorophosphate accounts for 11.0% of the total mass of the liquid mixed solution, and uniformly mixing to prepare the liquid mixed solution.
Step six: and placing the bare cell in a shell for top side encapsulation, wherein the shell is an aluminum plastic film. And injecting the electrolyte mixed solution into the battery cell. Standing the cell in vacuum, and standing at a high temperature of 40 ℃ for 24 hours to fully infiltrate the electrolyte mixed solution;
step seven: the cell liquid injection port is downward, the cell main body is pressurized and vacuumized, residual electrolyte is pumped out, and then the cell main body is heated to 80 ℃ and kept for 2 hours, so that the electrolyte mixed liquid is completely solidified;
step eight: after the battery is formed and degassed, and a finished battery cell is obtained, a curve of the charge-discharge capacity of the battery versus the voltage is shown in fig. 3, which shows that the secondary battery prepared by the embodiment has better charge-discharge performance.
Comparative example one: the utility model provides a sodium ion battery, includes negative pole piece 1, barrier film 2, positive pole piece 4, electrolyte and casing, barrier film 2 is used for separating negative pole piece 1 and positive pole piece 4, the casing is used for installing negative pole piece 1, barrier film 2, positive pole piece 4 and electrolyte encapsulation.
While the foregoing description illustrates and describes several preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims (10)

1. The utility model provides a lamination electricity core structure, its characterized in that, including negative pole piece, one or more bipolar pole piece and the positive pole piece that sets gradually, be provided with the barrier film between negative pole piece and the bipolar pole piece, be provided with the barrier film between bipolar pole piece and the positive pole piece, the negative pole piece includes negative pole aluminium foil and sets up the negative pole active coating in at least one side of negative pole aluminium foil, the positive pole piece includes positive pole aluminium foil and sets up the positive pole active coating in at least one side of positive pole aluminium foil, the bipolar pole piece includes the aluminium foil current collector, sets up the positive pole active coating in one side of aluminium foil current collector and sets up the negative pole active coating in the aluminium foil opposite side, the positive pole active coating in the bipolar pole piece is located one side of negative pole piece, be provided with the barrier film between two adjacent bipolar pole pieces.
2. The laminated cell structure of claim 1, wherein the separator comprises a gel state separator or a solid state electrolyte separator, the gel state separator comprising one of a gel state polypropylene separator, a gel state polyethylene separator, a gel state non-woven separator, the solid state electrolyte separator comprising a ceramic inorganic solid state electrolyte or a polymer solid state electrolyte.
3. The laminated cell structure of claim 1, wherein the thickness of the isolation film is 0.003-0.1 mm.
4. The laminated cell structure of claim 1, wherein the aluminum foil current collector has a thickness of 0.005-0.02 mm, the positive active coating in the bipolar pole piece has a thickness of 0.01-0.5 mm, and the negative active coating in the bipolar pole piece has a thickness of 0.01-0.5 mm.
5. The laminated cell structure of claim 1, wherein an insulating layer is disposed around the outermost edge of the positive active coating of the bipolar pole piece.
6. The laminated cell structure of claim 5, wherein the insulating layer is made of one or more of polyvinyl chloride, polycarbonate, polymethyl methacrylate, polyurethane, polytetrafluoroethylene, butadiene rubber, and styrene butadiene rubber.
7. The laminated cell structure of claim 1, wherein the side length of the negative electrode active coating in the bipolar pole piece is 0.5mm to 5mm greater than the side length of the positive electrode active coating in the bipolar pole piece.
8. The laminated cell structure of claim 1, wherein the negative electrode tab is provided with a tab and the positive electrode tab is provided with a tab.
9. A secondary battery comprising an electrolyte, a casing and a laminated cell structure according to any one of claims 1 to 8, wherein one or more laminated cell structures are provided, and wherein a plurality of laminated cell structures are electrically connected to each other, and wherein the casing is configured to encapsulate the electrolyte and the laminated cell structure.
10. The secondary battery according to claim 9, wherein the case is made of one of stainless steel, an aluminum plastic film, and an aluminum plate.
CN202310112038.7A 2023-02-14 2023-02-14 Lamination cell structure and secondary battery Pending CN116315007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310112038.7A CN116315007A (en) 2023-02-14 2023-02-14 Lamination cell structure and secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310112038.7A CN116315007A (en) 2023-02-14 2023-02-14 Lamination cell structure and secondary battery

Publications (1)

Publication Number Publication Date
CN116315007A true CN116315007A (en) 2023-06-23

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Family Applications (1)

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CN202310112038.7A Pending CN116315007A (en) 2023-02-14 2023-02-14 Lamination cell structure and secondary battery

Country Status (1)

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CN (1) CN116315007A (en)

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