CN112289981B - Manufacturing method of bipolar electrode and battery - Google Patents

Manufacturing method of bipolar electrode and battery Download PDF

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CN112289981B
CN112289981B CN202011153883.1A CN202011153883A CN112289981B CN 112289981 B CN112289981 B CN 112289981B CN 202011153883 A CN202011153883 A CN 202011153883A CN 112289981 B CN112289981 B CN 112289981B
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current collector
bipolar
bipolar current
coated
slurry
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CN112289981A (en
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任明秀
许涛
王晓燕
王磊
牛亚如
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M10/058—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
    • 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
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0433—Molding
    • 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
    • H01M4/139—Processes of manufacture
    • H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/029—Bipolar electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a bipolar electrode and a manufacturing method of a battery, wherein slurry formed by positive active substances is coated on one side surface of a bipolar current collector, slurry formed by negative active substances is coated on one side surface of an auxiliary current collector, after the auxiliary current collector is separated, dried and rolled, a conductive adhesive is coated on the other side of the bipolar current collector, and the auxiliary current collector and the conductive adhesive are compounded into the bipolar electrode. According to the method for manufacturing the bipolar electrode, the positive and negative active materials are separately rolled, and the rolled positive and negative active materials are bonded through the conductive adhesive, so that the waste of overvoltage and volume energy density is avoided, and the continuity of electrode manufacturing can be realized.

Description

Manufacturing method of bipolar electrode and battery
Technical Field
The invention relates to the field of lithium batteries, in particular to a bipolar electrode and a manufacturing method of a battery.
Background
The two sides of the current collector are coated with the same type of active substances, and the slurry mixing and compaction of the same active substance have similar requirements and attributes, so that the same system solvent is used in the coating process, and the deformation force and the solvent influence in the evaporation process are acceptable; the influence of compaction, the compaction density of a material and the required consistency in the rolling process on the deformation of a pole piece is minimized, but in a bipolar electrode, different types of active substances are arranged on the upper side and the lower side, the types of solvents used in the slurry mixing and coating process are different, mutual influence is easily generated during coating and baking, particularly, when the pole piece is rolled, due to the fact that the rolling coefficients are different, the side with the larger rolling coefficient is rolled to easily cause overpressure, and the side with the smaller rolling coefficient is rolled to easily cause the waste of volume energy density.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bipolar electrode and a manufacturing method of a battery, which avoid the waste of overvoltage and volume energy density and can also realize the continuity of electrode manufacturing.
The technical scheme of the invention is as follows:
a manufacturing method of a bipolar electrode specifically comprises the following steps:
(1) coating slurry consisting of positive active substances on one side surface of the bipolar current collector, and drying, rolling and molding;
(2) coating slurry consisting of negative active materials on one side surface of the auxiliary current collector, and drying, rolling and molding; the auxiliary current collector is of a porous structure, and slurry formed by the negative active material extends into the holes of the auxiliary current collector;
(3) and coating a conductive adhesive layer on the other side surface of the bipolar current collector, and bonding the other side surface of the auxiliary current collector with the conductive adhesive layer to form the bipolar electrode.
The bipolar current collector is a single bipolar current collector consisting of a single metal substance, or a composite bipolar current collector consisting of different metal substances or different metals and nonmetal substances.
The single bipolar current collector is made of metal Al or stainless steel, the composite bipolar current collector made of different metal substances is made of aluminum copper or aluminum nickel metal, and the composite bipolar current collector made of different metals and non-metal substances is made of metal aluminum copper and conductive resin.
When the bipolar current collector is a single bipolar current collector, slurry formed by positive active materials is coated on any side surface of the bipolar current collector; when the bipolar current collector is a composite bipolar current collector, slurry formed by the positive active material is coated on one side surface of the bipolar current collector with high pressure resistance.
The auxiliary current collector is made of a non-conductive material or a conductive metal mesh, and the non-conductive material is selected from polypropylene (PP), Polyethylene (PE), polyethylene terephthalate (PET) or Polyimide (PI).
The rolling compaction density of the slurry formed by the positive electrode active material after being coated on the bipolar current collector is larger than that of the slurry formed by the negative electrode active material after being coated on the auxiliary current collector.
The area of the side surface of the auxiliary current collector is smaller than that of the side surface of the bipolar current collector, and the coating areas of the slurry formed by the positive electrode active material and the slurry formed by the negative electrode active material are smaller than those of the side surface of the auxiliary current collector; the coating area of the conductive adhesive layer is smaller than the area of the side face of the bipolar current collector and larger than the area of the side face of the auxiliary current collector.
The edge of the auxiliary current collector is in reinforced contact with the other side face of the bipolar current collector, which is not coated with the slurry formed by the positive active material, through welding.
A plurality of bipolar electrodes and a plurality of partition plates are overlapped at intervals to form a roll core, the overlapping directions of the bipolar electrodes are the same, a plurality of bipolar current collectors and the end parts of the partition plates in the same direction are hermetically connected to form a sealing layer, then the roll core is placed in a battery shell, and the battery is manufactured after liquid injection, formation, secondary sealing and capacity grading.
The bottom surface and the top surface of the winding core are respectively two side surfaces of a bipolar current collector, namely, bipolar electrodes on the top layer and the bottom layer of the winding core are respectively a bipolar current collector A only coated with slurry formed by positive active substances, a bipolar current collector only coated with a conductive adhesive layer and an adhesive composite structure B coated with an auxiliary current collector formed by negative active substances, one side surface of the bipolar current collector A not coated with the slurry formed by the positive active substances and one side surface of the bipolar current collector in the adhesive composite structure B not coated with the conductive adhesive layer are respectively the bottom surface and the top surface of the winding core, and the bottom surface and the top surface of the winding core are respectively connected with a conductive segment partially extending out of a battery shell.
The invention has the advantages that:
the invention coats the slurry composed of the positive active material on one side of the bipolar current collector, coats the slurry composed of the negative active material on one side of the auxiliary current collector, coats the conductive adhesive on the other side of the bipolar current collector after separated drying and rolling, and combines the auxiliary current collector and the conductive adhesive into the bipolar electrode. According to the method for manufacturing the bipolar electrode, the positive and negative active materials are separately rolled, and the rolled positive and negative active materials are bonded through the conductive adhesive, so that the waste of overvoltage and volume energy density is avoided, and the continuity of electrode manufacturing can be realized.
Drawings
FIG. 1 is a schematic structural view of a bipolar electrode according to embodiment 1 of the present invention.
FIG. 2 is a schematic view showing the structure of a bipolar battery according to example 1 of the present invention.
FIG. 3 is a schematic view showing the structure of a bipolar battery according to example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a method for manufacturing a bipolar electrode specifically includes the following steps:
(1) the method comprises the steps of adopting a copper-aluminum composite belt as a bipolar current collector, coating an NCM slurry 13 with the mass percentage of an anode active substance of 96% and the solid content of 73% on the Al side surface of the bipolar current collector, drying at 100 ℃, rolling, and compacting at the density of 3.4g/cm, wherein the thickness of aluminum of an anode conductive layer 11 is 10um, and the thickness of copper of a cathode conductive layer 12 is 4.5um3；
(2) A copper mesh is adopted as an auxiliary current collector 14, graphite slurry 15 with the mass percentage of negative active material of 95 percent and the solid content of 53 percent is coated on one side surface of the auxiliary current collector 14, and then the graphite slurry is coated on a substrate 100Drying at the temperature of 1.7g/cm, rolling, and compacting at the density of3；
(3) And coating a conductive adhesive layer 16 on the Cu side surface of the bipolar current collector negative electrode conductive layer 12, then putting the bipolar current collector and the auxiliary current collector 14 coated with graphite slurry into a roller, and drying, so that the other side surface of the auxiliary current collector 14 is bonded with the conductive adhesive layer 16 to form a bipolar electrode, and the edge of the auxiliary current collector 14 is in reinforced contact with the Cu side surface of the bipolar current collector through welding.
The area of the side surface of the auxiliary current collector 14 is smaller than that of the side surface of the bipolar current collector, and the coating areas of the NCM slurry 13 and the graphite slurry 15 are smaller than that of the side surface of the auxiliary current collector; the coated area of the conductive adhesive layer 16 is smaller than the area of the side of the bipolar current collector and larger than the area of the side of the auxiliary current collector 14.
Referring to fig. 2, a plurality of bipolar electrodes and a plurality of separators 21 are stacked at intervals to form a roll core, the stacking direction of the bipolar electrodes is the same, namely the bipolar current collector of each bipolar electrode is positioned below the corresponding auxiliary current collector 14, the same-direction end parts of the bipolar current collectors (the positive electrode conductive layer 11 and the negative electrode conductive layer 12) and the separators 21 are sealed by an insulating sealing device, then a sealing layer 22 is formed by hot pressing, and after the roll core is placed in a battery shell 23, a battery is manufactured by liquid injection, formation, secondary sealing and capacity grading; the bottom surface and the top surface of the winding core are respectively two side surfaces of a bipolar current collector, namely, bipolar electrodes on the top layer and the bottom layer of the winding core are respectively a bipolar current collector A only coated with NCM slurry 13, a bipolar current collector only coated with a conductive adhesive layer 16 and a bonding composite structure B of an auxiliary current collector coated with graphite slurry 15, one side surface of the bipolar current collector A not coated with the NCM slurry 13 and one side surface of the bipolar current collector in the bonding composite structure B not coated with the conductive adhesive layer 16 are respectively the bottom surface and the top surface of the winding core, and the bottom surface and the top surface of the winding core are respectively connected with a conductive segment 24 partially extending out of a battery shell.
Example 2
Referring to fig. 3, a method for manufacturing a bipolar electrode specifically includes the following steps:
(1) the porous evaporation composite current collector which is conducted by adopting the conductive filling layer is used as a bipolar current collector, wherein 500nm copper (a negative electrode conductive layer 12) and 700nm aluminum (a positive electrode conductive layer 11) are conducted by 0.5um conductive carbon black 17, a porous supporting layer 18 is arranged between the negative electrode conductive layer 12 and the positive electrode conductive layer 11, the surface of the Al side of the bipolar current collector is coated with NCM slurry 13 with the mass percentage of positive electrode active substances of 96 percent and the solid content of 73 percent, the NCM slurry is dried at 100 ℃ and then rolled, and the compaction density is 3.4g/cm3；
(2) A copper mesh is adopted as an auxiliary current collector 14, one side surface of the auxiliary current collector 14 is coated with graphite slurry 15 with the mass percentage of negative active material of 95 percent and the solid content of 53 percent, then the graphite slurry is dried at 100 ℃ and rolled, and the compaction density is 1.7g/cm3；
(3) And coating a conductive adhesive layer 16 on the Cu side surface of the bipolar current collector negative electrode conductive layer 12, then putting the bipolar current collector and the auxiliary current collector 14 coated with the graphite slurry into a roller together, and drying, so that the other side surface of the auxiliary current collector 14 is bonded with the conductive adhesive layer 16 to form the bipolar electrode.
The battery was prepared in the same manner as in example 1, except that after the stacking of the porous support layers 18 of the plurality of bipolar current collectors and the end portions of the separators 21 in the same direction were sealed by an insulating sealing means, and then the sealing layer 22 was formed by hot pressing.
Example 3
Referring to fig. 1, a method for manufacturing a bipolar electrode specifically includes the following steps:
(1) the method comprises the steps of adopting a copper-aluminum composite belt as a bipolar current collector, coating an NCM slurry 13 with the mass percentage of an anode active substance of 96% and the solid content of 73% on the Al side surface of the bipolar current collector, drying at 100 ℃, rolling, and compacting at the density of 3.4g/cm, wherein the thickness of aluminum of an anode conductive layer 11 is 10um, and the thickness of copper of a cathode conductive layer 12 is 4.5um3；
(2) The method comprises the steps of adopting porous PET as an auxiliary current collector 14, coating graphite slurry 15 with the mass percentage of 95% of negative active material and 53% of solid content on one side surface of the auxiliary current collector 14, drying at 100 ℃, rolling, and compacting at the density of 1.7g/cm3；
(3) And coating a conductive adhesive layer 16 on the Cu side surface of the bipolar current collector negative electrode conductive layer 12, then putting the bipolar current collector and the auxiliary current collector 14 coated with graphite slurry into a roller, and drying, so that the other side surface of the auxiliary current collector 14 is bonded with the conductive adhesive layer 16 to form a bipolar electrode, and the edge of the auxiliary current collector 14 is in reinforced contact with the Cu side surface of the bipolar current collector through welding.
The cell was prepared in the same manner as in example 1.
Comparative example 1
A manufacturing method of a bipolar electrode specifically comprises the following steps:
(1) the method comprises the steps of adopting a copper-aluminum composite belt as a bipolar current collector, coating graphite slurry with the mass percentage of 95% of active substances and the solid content of 53% on the surface of the Cu side of the bipolar current collector, drying at 100 ℃, rolling, and compacting the graphite slurry with the density of 1.7g/cm, wherein the thickness of copper is 4.5um, the thickness of aluminum is 10um3；
(2) An aluminum net is adopted as an auxiliary current collector, NCM slurry with the active substance mass percentage of 96% and the solid content of 73% is coated on one side surface of the auxiliary current collector, the auxiliary current collector is dried at the temperature of 100 ℃ and then is rolled, and the compaction density is 3.4g/cm3；
(3) And coating a conductive adhesive layer on the Al side surface of the bipolar current collector, then putting the bipolar current collector and the auxiliary current collector coated with the NCM slurry into a roller together, and drying, so that one side surface of the auxiliary current collector, which is not coated with the NCM slurry, is bonded with the conductive adhesive layer to form the bipolar electrode.
The cell was prepared in the same manner as in example 1.
Comparative example 2
A manufacturing method of a bipolar electrode specifically comprises the following steps:
(1) the method comprises the steps of adopting a copper-aluminum composite belt as a bipolar current collector, coating graphite slurry with the mass percentage of 95% of active substances and the solid content of 53% on the surface of the Cu side of the bipolar current collector, drying at 100 ℃, rolling, and compacting the graphite slurry with the density of 1.7g/cm, wherein the thickness of copper is 4.5um, the thickness of aluminum is 10um3；
(2) Coating NCM slurry with active substance mass percentage of 96% and solid content of 73% on the Al side surface of the bipolar current collector, drying at 100 ℃, rolling, and compacting with density of 3.4g/cm3And obtaining the bipolar electrode.
The cell was prepared in the same manner as in example 1.
The bipolar electrodes prepared in examples 1 to 3 and comparative examples 1 to 2 were tested, and the test results are shown in Table 1.
TABLE 1 comparison of the experimental results of the examples and comparative examples
Figure BDA0002742091470000061
Figure BDA0002742091470000071
It can be seen from the comparison of examples 1-3 that the increase of the welding step after the compounding can effectively increase the peeling strength of the active material, while the non-conductive auxiliary current collector has higher peeling due to larger area and perforation rate; comparative example 1 was large due to compaction (compacted density 3.4 g/cm)3) The problem of belt breakage of the aluminum net is easy to occur; comparative example 2 it can be seen that direct rolling causes an overpressure in the negative electrode (compacted density 3.4 g/cm)3) Lithium evolution occurs.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. A method for manufacturing a bipolar electrode is characterized in that: the method specifically comprises the following steps:
(1) coating slurry consisting of positive active substances on one side surface of the bipolar current collector, and drying, rolling and molding;
(2) coating slurry consisting of negative active materials on one side surface of the auxiliary current collector, and drying, rolling and molding; the auxiliary current collector is of a porous structure, and slurry formed by the negative active material extends into the holes of the auxiliary current collector;
(3) coating a conductive adhesive layer on the other side surface of the bipolar current collector, and bonding the other side surface of the auxiliary current collector with the conductive adhesive layer to form a bipolar electrode;
the rolling compaction density of the slurry formed by the positive electrode active material after being coated on the bipolar current collector is larger than that of the slurry formed by the negative electrode active material after being coated on the auxiliary current collector.
2. The method of claim 1, wherein: the bipolar current collector is a single bipolar current collector consisting of a single metal substance, or a composite bipolar current collector consisting of different metal substances or different metals and nonmetal substances.
3. The method of claim 2, wherein: the single bipolar current collector is made of metal Al or stainless steel, the composite bipolar current collector made of different metal substances is made of aluminum copper or aluminum nickel metal, and the composite bipolar current collector made of different metals and non-metal substances is made of metal aluminum copper and conductive resin.
4. The method of claim 2, wherein: when the bipolar current collector is a single bipolar current collector, slurry formed by positive active materials is coated on any side surface of the bipolar current collector; when the bipolar current collector is a composite bipolar current collector, slurry formed by the positive active material is coated on one side surface of the bipolar current collector with high pressure resistance.
5. The method of claim 1, wherein: the auxiliary current collector is made of a non-conductive material or a conductive metal mesh, and the non-conductive material is selected from polypropylene (PP), Polyethylene (PE), polyethylene terephthalate (PET) or Polyimide (PI).
6. The method of claim 1, wherein: the area of the side surface of the auxiliary current collector is smaller than that of the side surface of the bipolar current collector, and the coating areas of the slurry formed by the positive electrode active material and the slurry formed by the negative electrode active material are smaller than those of the side surface of the auxiliary current collector; the coating area of the conductive adhesive layer is smaller than the area of the side face of the bipolar current collector and larger than the area of the side face of the auxiliary current collector.
7. The method of claim 1, wherein: the edge of the auxiliary current collector is in reinforced contact with the other side face of the bipolar current collector, which is not coated with the slurry formed by the positive active material, through welding.
8. The method of claim 1, wherein the bipolar electrode is formed as a battery, and the method further comprises: the bipolar electrodes and the partition plates are overlapped at intervals to form a roll core, the overlapping directions of the bipolar electrodes are the same, the bipolar current collectors and the end parts of the partition plates in the same direction are hermetically connected to form a sealing layer, and then the roll core is placed in a battery shell and then subjected to liquid injection, formation, secondary sealing and capacity grading to form the battery.
9. The method for manufacturing a battery according to claim 8, wherein: the bottom surface and the top surface of the winding core are respectively two side surfaces of a bipolar current collector, namely, bipolar electrodes on the bottom layer and the top layer of the winding core are respectively a bipolar current collector A only coated with slurry formed by positive active substances, a bipolar current collector only coated with a conductive adhesive layer and an adhesive composite structure B coated with an auxiliary current collector formed by negative active substances, one side surface of the bipolar current collector A not coated with the slurry formed by the positive active substances and one side surface of the bipolar current collector in the adhesive composite structure B not coated with the conductive adhesive layer are respectively the bottom surface and the top surface of the winding core, and the bottom surface and the top surface of the winding core are respectively connected with conductive terminals partially extending out of a battery shell.
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