CN112952034A - Lithium ion battery cell and lithium ion battery adopting same - Google Patents

Lithium ion battery cell and lithium ion battery adopting same Download PDF

Info

Publication number
CN112952034A
CN112952034A CN202110237508.3A CN202110237508A CN112952034A CN 112952034 A CN112952034 A CN 112952034A CN 202110237508 A CN202110237508 A CN 202110237508A CN 112952034 A CN112952034 A CN 112952034A
Authority
CN
China
Prior art keywords
area
positive
negative electrode
blank
negative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110237508.3A
Other languages
Chinese (zh)
Other versions
CN112952034B (en
Inventor
朱意
靳玲玲
申红光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Power Battery Co Ltd
Original Assignee
Zhuhai Cosmx Power Battery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuhai Cosmx Power Battery Co Ltd filed Critical Zhuhai Cosmx Power Battery Co Ltd
Priority to CN202110237508.3A priority Critical patent/CN112952034B/en
Publication of CN112952034A publication Critical patent/CN112952034A/en
Application granted granted Critical
Publication of CN112952034B publication Critical patent/CN112952034B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H01M4/131—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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a lithium ion battery cell and a lithium ion battery adopting the same, wherein the battery cell comprises a battery cell main body, a positive tab and a negative tab, and the battery cell main body comprises at least one positive plate, at least one negative plate and at least one diaphragm; the positive plate comprises a positive foil, and the positive foil comprises a positive lug blank area and a positive active area; the negative plate comprises a negative foil material, and the negative foil material comprises a negative ear blank area and a negative active area; all the blank areas of the positive electrode lugs are positioned at one end of the electric core main body, and all the blank areas of the negative electrode lugs are positioned at the other end of the electric core main body; the positive/negative pole ear cover is arranged on the outer surface of the cell main body, one end of the positive/negative pole ear cover is welded on the blank area of the positive/negative pole ear, the other end of the positive/negative pole ear cover exceeds the blank area of the negative/positive pole ear and extends to the outside of the blank area of the negative/positive pole ear, and the negative/positive pole ear cover is welded on the blank area of the negative/positive pole ear and extends to the outside of the blank; the lithium ion battery cell provided by the invention can realize a multi-tab structure of the lithium ion battery cell without a die cutting process by bridging tabs in the blank area of the positive electrode tab and the blank area of the negative electrode tab.

Description

Lithium ion battery cell and lithium ion battery adopting same
All as the field of technology
The invention relates to the technical field of soft package lithium ion batteries, in particular to a lithium ion battery cell and a lithium ion battery adopting the same.
All the above-mentioned background techniques
The lithium ion battery is a novel secondary battery, mainly works by moving lithium ions between a positive electrode and a negative electrode, has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
With the wider application of the lithium ion battery, the requirement of people on the power of the lithium ion battery is higher, the thickness of the battery is increased, the lengths of the positive electrode and the negative electrode of the battery are increased, if a single tab form is adopted, the internal resistance of the battery is large, the polarization of the battery is serious during discharging, and the service life and the safety performance of the battery are influenced, so that the multi-tab technology is developed by technical personnel in the field for improving the power of the lithium ion battery, and the power of the lithium ion battery is greatly improved.
At present, the preparation process of the multi-electrode lithium ion battery mainly comprises the following steps: 1. and (3) die cutting: punching foil material at certain intervals in a foil empty area at the edge of a current collector of the pole piece to form a plurality of pole lugs; 2. a winding step: the pole piece is coiled into a coil core through a coiling machine, and a plurality of pole lugs formed by punching on the pole piece are overlapped together. The process of die cutting the pole piece has the following problems: copper and aluminum metal scraps are generated, and the safety performance of the lithium ion battery is seriously influenced; burrs are generated, and the burrs pierce the diaphragm to generate safety risk; the production efficiency is reduced and the manufacturing cost is increased.
All the contents of the invention
The first purpose of the invention is to provide a lithium ion battery cell, which can realize a multi-tab structure of the lithium ion battery cell without a die cutting process.
In order to realize the first purpose of the invention, the invention adopts the following technical scheme:
a lithium ion battery cell comprises a cell main body, a positive electrode tab and a negative electrode tab, wherein the cell main body comprises at least one positive electrode tab, at least one negative electrode tab and at least one diaphragm, at least one diaphragm is arranged between each positive electrode tab and each negative electrode tab,
the positive plate comprises a positive foil, and the positive foil comprises a positive lug blank area for welding a positive lug and a positive active area coated with a positive active material layer; the negative electrode sheet comprises a negative electrode foil, and the negative electrode foil comprises a negative electrode lug blank area for welding a negative electrode lug and a negative electrode active area coated with a negative electrode active material layer; the blank area of the positive electrode tab is positioned at one end of the cell main body, and the blank area of the negative electrode tab is positioned at the other end of the cell main body, which is opposite to the blank area of the positive electrode tab;
anodal ear lid is located electric core main part surface, and one end welds in anodal ear blank region, and the other end surpasss negative pole ear blank region and to the outside extension of negative pole ear blank region, the negative pole ear welds in negative pole ear blank region and to the outside extension of negative pole ear blank region, or, anodal ear welds in anodal ear blank region and to the outside extension of anodal ear blank region, electric core main part surface is located to the negative pole ear lid, and one end welds in negative pole ear blank region, and the other end surpasss anodal ear blank region and to the outside extension of anodal ear blank region.
As a specific implementation manner, in the case that the positive tab cover is disposed on the outer surface of the cell main body, the positive tab includes a positive welding region, a positive transition region, a positive connection region, and a positive tab region, which are arranged along the length direction; the positive electrode welding area covers part or all of the positive electrode lug blank area and is welded to the positive electrode lug blank area; the positive electrode transition region covers at least partial region of the cell main body corresponding to the positive electrode active region or the negative electrode active region; the positive electrode connecting region covers at least part of the negative electrode ear blank region; the positive electrode lug area exceeds the negative electrode lug blank area and extends towards the outside of the negative electrode lug blank area; the negative electrode lug comprises a negative electrode welding area and a negative electrode lug area which are arranged along the length direction; the negative electrode welding area is welded on the blank area of the negative electrode lug; the negative electrode ear region extends to the outside of the blank region of the negative electrode ear.
Further, the surface of the positive electrode transition region and/or the positive electrode connecting region is coated with an insulating coating.
In a specific embodiment, the thickness dimension of the positive electrode welding area and the positive electrode connecting area ranges from 0.01mm to 1mm, and the thickness dimension of the positive electrode transition area ranges from 0.01mm to 0.1 mm.
As a specific implementation manner, in the case that the negative electrode tab cover is disposed on the outer surface of the cell main body, the positive electrode tab includes a positive electrode welding region and a positive electrode tab region which are arranged along the length direction; the positive electrode welding area is welded on the blank area of the positive electrode lug; the positive electrode lug area extends to the outside of the blank area of the positive electrode lug; the negative electrode lug comprises a negative electrode welding area, a negative electrode transition area, a negative electrode connecting area and a negative electrode lug area which are arranged along the length direction; the negative electrode welding area covers part or all of the area of the negative electrode ear blank area and is welded to the negative electrode ear blank area; the negative electrode transition region covers at least partial region of the cell main body corresponding to the positive electrode active region or the negative electrode active region; the negative electrode connecting area covers at least part of the blank area of the positive electrode ear; the negative pole ear area exceeds the blank area of the positive pole ear and extends to the outside of the blank area of the positive pole ear.
Further, the surface of the negative electrode transition region and/or the negative electrode connecting region is coated with an insulating coating.
In a specific embodiment, the thickness of the negative electrode welding area and the negative electrode connecting area ranges from 0.01mm to 1mm, and the thickness of the negative electrode transition area ranges from 0.01mm to 0.1 mm.
In a specific embodiment, the blank regions of the positive electrode tabs of all the positive electrode sheets are connected by welding, and the blank regions of the negative electrode tabs of all the negative electrode sheets are connected by welding.
The second purpose of the invention is to provide a lithium ion battery adopting the lithium ion battery cell, which can realize a multi-tab structure of the lithium ion battery cell without a die cutting process.
In order to achieve the second purpose of the invention, the invention adopts the following technical scheme:
a lithium ion battery comprises the lithium ion battery cell, a packaging shell and electrolyte.
The invention has the beneficial effects that:
according to the lithium ion cell provided by the invention, the positive electrode lug and the negative electrode lug of the lithium ion cell are led out from the same side (A-shaped structure) through the lug which is connected across the blank area of the positive electrode lug and the blank area of the negative electrode lug, and the multi-lug structure of the lithium ion cell can be realized without a die cutting process, so that the problems that the safety performance of the lithium ion cell is influenced by metal scraps of copper and aluminum generated in the die cutting process and the safety risk is generated because burrs are generated in the die cutting process and the diaphragms are punctured by the burrs are solved, the power of the lithium ion cell is ensured, the production efficiency is not influenced, and the manufacturing cost is. Meanwhile, the lithium ion battery cell provided by the invention is connected in parallel through the blank area corresponding to at least one pole piece, so that the contact area between the pole pieces is increased, the internal resistance of the lithium ion battery is reduced, the discharging and charging efficiency of the battery is improved, meanwhile, the internal resistance of the lithium ion battery is reduced, the heating value of the lithium ion battery during charging and discharging can be correspondingly reduced, and the stability of the battery is maintained.
Description of the drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. The drawings in the following description are only embodiments of the invention and other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is an exploded schematic view (partially exploded) of a lithium ion battery cell according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a lamination of a lithium ion battery cell according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a lamination of a positive plate and a negative plate of a lithium ion battery cell provided by an embodiment of the invention;
fig. 4 is a schematic structural diagram of a positive plate of a lithium ion battery cell according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a negative plate of a lithium ion battery cell according to a first embodiment of the present invention;
fig. 6 is a schematic diagram of a positive tab structure of a lithium ion battery cell according to an embodiment of the present invention;
FIG. 7 is a sectional view taken along line A-A of FIG. 6;
fig. 8 is a schematic diagram of a novel negative electrode tab structure of a lithium ion battery cell according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a lamination of a lithium ion battery cell according to a second embodiment of the present invention.
(specific embodiments) in all cases
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In the description of the present invention, it is to be understood that the terms "length", "width", "thickness", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "at least one" means two or more unless otherwise specified.
Example one
A lithium ion battery comprises a lithium ion battery cell, an electrolyte (not shown) and a packaging shell (not shown), wherein the battery cell is packaged by the packaging shell (in the embodiment, an aluminum-plastic film), the battery cell is baked under a vacuum condition to remove moisture in the battery cell, then the electrolyte is injected, and the battery is subjected to formation, sorting and other treatments, so that the lithium ion battery is obtained; the battery cell can be a winding battery cell or a laminated battery cell, and the winding battery cell is formed by sequentially stacking at least one positive plate, at least one diaphragm and at least one negative plate, welding a positive tab and a negative tab and then winding; specifically, the diaphragm is formed by alternately stacking a positive plate, a diaphragm, a negative plate, a diaphragm and a positive plate, welding a positive tab and a negative tab and then winding; the laminated cell is formed by sequentially stacking at least one positive plate, at least one diaphragm and at least one negative plate and then welding a positive tab and a negative tab; specifically, the membrane electrode is formed by welding a positive electrode tab and a negative electrode tab after alternately stacking a positive electrode tab, a membrane, a negative electrode tab, a membrane and a positive electrode tab.
As shown in fig. 1 and 2, as a specific embodiment, the lithium ion battery pack in the present embodiment includes a battery cell main body 100, a positive electrode tab 200, and a negative electrode tab 300, where the battery cell main body 100 includes at least one positive electrode tab 110, at least one negative electrode tab 120, and at least one separator 130, which are alternately stacked; as shown in fig. 3 and 4, the positive electrode sheet 110 includes a positive electrode foil having a rectangular sheet structure, and as a specific embodiment, the positive electrode foil is made of aluminum foil; the surface of the positive electrode foil comprises a positive electrode tab blank area 111 for welding the positive electrode tab 200 and a positive electrode active area 112 coated with the positive electrode active material layer 1111, the positive electrode tab blank area 111 comprises a rectangular area on one side edge of the positive electrode foil, and the rectangular area is a blank positive electrode foil, namely, the positive electrode active material layer 1111 is not coated; the positive electrode active region 112 is coated with a positive electrode active material layer 1111; the negative electrode sheet 120 includes a negative electrode foil in a rectangular sheet structure, and as a specific embodiment, the negative electrode foil is made of copper foil; the surface of the negative electrode foil includes a negative electrode tab blank area 121 for welding the negative electrode tabs 300 and a negative electrode active region 122 coated with the negative electrode active material layer 1211, the negative electrode tab blank area 121 includes a rectangular area on one side edge of the negative electrode foil, the rectangular area is a blank positive electrode foil, i.e., not coated with the negative electrode active material layer 1211; the anode active region 122 is coated with an anode active material layer 1211.
In other embodiments, positive ear void region 111 comprises a rectangular area along the width of one side edge of the positive foil and a rectangular area at the end of the positive foil.
As a specific embodiment, the positive electrode active material layer includes a positive electrode active material, a conductive agent and a binder, and the positive electrode active material includes one or a combination of a nickel-cobalt-manganese ternary material, a lithium iron phosphate material, a lithium cobaltate material, a lithium manganate material, a lithium nickelate material, a lithium-rich manganese-based material, activated carbon, and the like, which are well known to those skilled in the art, and therefore, the details are not further described; the conductive agent can be one or more of conductive carbon black, carbon nano tubes, conductive graphite and graphene, the binder can be one or more of polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethylcellulose, styrene butadiene rubber, polyurethane, fluorinated rubber and polyvinyl alcohol, the content (mass percentage) of the positive active material in the positive active material layer is 96-98.5%, the content of the conductive agent is 0.5-2.5%, and the content of the binder is 1-1.5%.
As a specific embodiment, the anode active material layer includes an anode active material, a conductive agent, a binder, and a dispersant. The negative active material includes one or a combination of graphite, lithium titanate, silicon-based materials, hard carbon, tin-based materials, graphene, carbon nanotubes, etc., which are well known to those skilled in the art, and thus, will not be further described; the conductive agent can be one or more of conductive carbon black, carbon nano tubes, conductive graphite and graphene, the binder can be one or more of polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethylcellulose, styrene butadiene rubber, polyurethane, fluorinated rubber and polyvinyl alcohol, and the dispersing agent can be sodium carboxymethylcellulose or potassium carboxymethylcellulose. In the negative electrode active material layer, the content (mass percentage) of the negative electrode active material is 95-97%, the content of the conductive agent is 1-2%, the content of the adhesive is 1-1.5%, and the content of the dispersant is 0-1.5%.
As shown in fig. 1 and 3, the separator 130 is disposed between the positive electrode sheets 110 and the negative electrode sheets 120, the positive electrode active regions 112 and the negative electrode active regions 122 are located inside the coverage area of the separator 130, the positive electrode tab blank regions 111 and the negative electrode tab blank regions 121 are located outside the coverage area of the separator 130, the positive electrode tab blank regions 111 of all the positive electrode sheets 110 are located at one end of the cell body 100, and the negative electrode tab blank regions 121 of all the negative electrode sheets 120 are located at the end of the cell body 100 opposite to the positive electrode tab blank regions 111; the positive electrode ear blank regions 111 of all the positive electrode sheets 110 disposed outside the separator 130 are in stacked contact with each other, so that the different positive electrode sheets 110 are connected in parallel with each other; the negative electrode tab spaces 121 of all the negative electrode tabs 120 disposed outside the separator 130 are in stacked contact with each other such that the different negative electrode tabs 120 are connected in parallel with each other; at least one pole piece (including the positive pole piece 110 and the negative pole piece 120) is connected in parallel through corresponding blank areas (including the positive pole ear blank area 111 and the negative pole ear blank area 121) in a surface connection mode, so that the contact area between the pole pieces is increased, the internal resistance of the lithium ion battery is reduced, the discharging and charging efficiency of the battery is improved, meanwhile, the internal resistance of the lithium ion battery is reduced, the heating value of the lithium ion battery during charging and discharging can be correspondingly reduced, and the stability of the battery is kept. As shown in fig. 2 and 6, the positive tab blank regions 111 of all the positive tabs 110 are connected by welding, the positive tab 200 is covered on the outer surface of the cell body 100, one end of the positive tab is welded to the positive tab blank region 111, and the other end of the positive tab exceeds the negative tab blank region 121 and extends to the outside of the negative tab blank region 121; the negative electrode tab blank regions 121 of all the negative electrode tabs 120 are connected by welding, and the negative electrode tabs 300 are welded to the negative electrode tab blank regions 121 and extend to the outside of the battery cell.
As shown in fig. 1, 2, 6 and 7, the positive tab 200 includes a positive electrode welding region 210, a positive electrode transition region 220, a positive electrode connecting region 230 and a positive electrode tab region 240 arranged along the length direction of the positive tab 200; the positive electrode tab 200 is covered on the battery cell main body 100, specifically, the positive electrode welding area 210 is in a strip shape, covers a rectangular area along the width direction on the side edge of the positive electrode tab blank area 111, and is welded to the positive electrode tab blank area 111; the positive electrode transition region 220 is in a sheet shape and covers the rest area of the positive electrode ear blank region 111, the positive electrode active region 112 and a partial area of the negative electrode ear blank region 121; the positive electrode connecting region 230 is strip-shaped, and one end of the positive electrode connecting region covers a part of the negative electrode ear blank region 121; the positive electrode tab region 240 extends beyond the negative electrode tab margin region 121 and extends outside the negative electrode tab margin region 121; the surfaces of the positive electrode transition region 220 and the positive electrode connection region 230 are coated with an insulating coating 500.
As shown in fig. 7, in the present embodiment, the thickness of the positive electrode bonding area 210 and the positive electrode bonding area 230 is 0.4mm, and the thickness of the positive electrode transition area 220 is 0.08 mm; the positive electrode tab area 240 includes a first positive electrode tab area 241 having a thickness of 0.6mm and a second positive electrode tab area 242 having a thickness of 0.4 mm.
As shown in fig. 8, the negative electrode tab 300 includes a negative electrode land 330 and a negative electrode tab 340 arranged along the length direction; the negative electrode welding area 330 is in a strip shape and is welded on the side edge of the negative electrode ear blank area 121 along the partial rectangular area of the width direction; the negative electrode tab region 340 extends outside the negative electrode tab space region 121.
The embodiment also provides a preparation method of the lithium ion battery, which comprises the following specific steps:
(1) preparing positive electrode active material layer slurry and negative electrode active material layer slurry;
specifically, a positive electrode active material layer, a conductive agent and a binder are mixed, and are stirred at a high speed to obtain a uniformly dispersed mixture, and the mixture is dissolved in a solvent to prepare positive electrode active material layer slurry; mixing the negative electrode active material, the conductive agent, the binder and the dispersant, stirring at a high speed to obtain a uniformly dispersed mixture, and dissolving the mixture in a solvent to prepare a negative electrode active material layer slurry.
(2) Preparing a positive plate and a negative plate with double-sided active substance coatings;
specifically, coating the positive active material layer slurry on a positive active area on the surface of a positive foil, reserving a blank area of a positive lug on one side edge of the surface of the positive foil, and not coating the positive active material layer slurry; coating the negative active material layer slurry on a negative active area on the surface of the negative foil, reserving a negative ear blank area on one side edge of the surface of the negative foil, and not coating the negative active material layer slurry.
(3) And alternately laminating the at least one positive plate, the at least one diaphragm and the at least one negative plate in sequence.
Specifically, the thin film is in a sheet shape, the length of the diaphragm is greater than that of the positive electrode active area or the negative electrode active area, and the length of the diaphragm is less than that of the positive electrode sheet or the negative electrode sheet.
Specifically, the positive electrode active areas of all the positive electrode sheets and the negative electrode active areas of all the negative electrode sheets are located inside the membrane covering area; the blank area of the positive electrode tabs of all the positive electrode sheets is located at one end of the battery cell main body, the blank area of the negative electrode tabs of all the negative electrode sheets is located at the other end of the battery cell main body opposite to the blank area of the positive electrode tabs, and the blank areas of the positive electrode tabs of all the positive electrode sheets and the blank areas of the negative electrode tabs of all the negative electrode sheets are located outside the diaphragm covering area.
(4) The blank areas of the positive electrode tabs of all the positive electrode plates are connected by welding, and the blank areas of the negative electrode tabs of all the negative electrode plates are connected by welding;
(5) and the positive lug cover is arranged on the outer surface of the electric core main body and then connected to the blank area of the positive lug through welding, and the negative lug is connected to the blank area of the negative lug through welding.
Specifically, the positive electrode welding area of the positive electrode lug covers a rectangular area along the width direction on the edge of the blank area of the positive electrode lug; the positive transition area of the positive tab covers the rest area of the blank area of the positive tab, the positive active area and the partial area of the blank area of the negative tab; one end of the positive electrode connecting region is covered on the partial rectangular region along the width direction on the side edge of the blank region of the negative electrode tab; the positive electrode lug area exceeds the negative electrode lug blank area and extends towards the outside of the negative electrode lug blank area; the negative electrode welding area is welded on the partial rectangular area along the width direction on the side edge of the negative electrode ear blank area, and the negative electrode ear area extends towards the outside of the negative electrode ear blank area.
Specifically, the present embodiment performs welding by ultrasonic waves.
(6) After the lamination of accomplishing electric core, carry out the cover shell with electric core, then annotate liquid, seal and other follow-up operations.
Example two
As shown in fig. 9, the present embodiment is different from the first embodiment in that: the negative tab 300 includes a negative welding region 310, a negative transition region 320, a negative connection region 330, and a negative tab region 340 arranged along the length direction of the negative tab 300; the negative electrode tab 300 is covered on the outer surface of the battery cell main body 100, specifically, the negative electrode welding region 310 is in a strip shape, covers a rectangular region along the width direction on the side edge of the negative electrode tab blank region 121, and is welded to the negative electrode tab blank region 121; the negative electrode transition region 320 is in a sheet shape and covers the rest area of the negative electrode ear blank region 121, the negative electrode active region 122 and a partial area of the positive electrode ear blank region 121; the negative electrode connecting area 330 is strip-shaped, and one end of the negative electrode connecting area covers a partial rectangular area along the width direction on the side edge of the positive electrode ear blank area 121; the negative electrode ear area 340 extends beyond the positive electrode ear blank area 121 and extends to the outside of the positive electrode ear blank area 122; the surfaces of the negative electrode transition region 320 and the negative electrode connection region 330 are coated with the insulating coating 500.
In the present embodiment, the positive tab includes a positive tab region 230 and a positive tab region 240 arranged along the length direction; the positive electrode welding area 230 is in a strip shape and is welded on the side edge of the positive electrode ear blank area 111 along the partial rectangular area of the width direction; the positive ear region 240 extends outside the positive ear void region 111.
In this embodiment, the negative electrode tab cover is arranged on the outer surface of the cell body and then connected to the blank area of the negative electrode tab by welding, and the positive electrode tab is connected to the blank area of the positive electrode tab by welding.
Specifically, the negative electrode tab welding area of the negative electrode tab covers a rectangular area along the width direction on the edge of the margin of the negative electrode tab blank area; the negative electrode transition region of the negative electrode tab covers the rest region of the blank region of the negative electrode tab, the negative electrode active region and the partial region of the blank region of the positive electrode tab; one end of the negative electrode connecting area covers a partial rectangular area along the width direction on the side edge of the blank area of the positive electrode ear; the negative electrode ear area exceeds the blank area of the positive electrode ear and extends to the outside of the blank area of the positive electrode ear; the positive electrode welding area is welded on the partial rectangular area along the width direction on the side edge of the blank area of the positive electrode lug, and the positive electrode lug area extends towards the outside of the blank area of the positive electrode lug.
In this embodiment, the thickness of the negative electrode welding area 310 and the negative electrode connecting area 330 is 0.4mm, and the thickness of the negative electrode transition area 320 is 0.08 mm; the negative electrode tab region 340 includes a first negative electrode tab region 341 having a thickness of 0.6mm and a second negative electrode tab region 342 having a thickness of 0.4 mm.
(6) After the lamination of accomplishing electric core, carry out the cover shell with electric core, then annotate liquid, seal and other follow-up operations.
EXAMPLE III
The difference between this embodiment and the first or second embodiment is that: the width of the diaphragm is slightly larger than the width of the positive plate and the negative plate.
Example four
The difference between this embodiment and the first or third embodiment is: the thickness of the positive electrode bonding area 210 and the positive electrode bonding area 230 was 0.01mm, and the thickness of the positive electrode transition area 220 was 0.01 mm.
EXAMPLE five
The difference between this embodiment and the first embodiment or the third embodiment or the fourth embodiment is that: the thickness of the positive electrode bonding area 210 and the positive electrode bonding area 230 is 1mm, and the thickness of the positive electrode transition area 220 is 0.1 mm.
EXAMPLE six
The difference between this embodiment and the second or third embodiment is: the thickness of the negative electrode welding area 310 and the negative electrode connecting area 330 is 0.01mm, and the thickness of the negative electrode transition area 320 is 0.01 mm.
EXAMPLE seven
The difference between this embodiment and the second embodiment, the third embodiment or the sixth embodiment is that: the thickness of the negative electrode welding area 310 and the negative electrode connection area 330 is 1mm, and the thickness of the negative electrode transition area 320 is 0.1 mm.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that at least one of such improvements and modifications to the present invention without departing from the principles of the present invention should be considered within the scope of the present invention.

Claims (10)

1. A lithium ion battery cell comprises a cell main body, a positive electrode tab and a negative electrode tab, wherein the cell main body comprises at least one positive electrode tab, at least one negative electrode tab and at least one diaphragm, at least one diaphragm is arranged between each positive electrode tab and each negative electrode tab,
the method is characterized in that: the positive plate comprises a positive foil, and the positive foil comprises a positive lug blank area for welding a positive lug and a positive active area coated with a positive active material layer; the negative electrode sheet comprises a negative electrode foil, and the negative electrode foil comprises a negative electrode lug blank area for welding a negative electrode lug and a negative electrode active area coated with a negative electrode active material layer; the blank area of the positive electrode tab is positioned at one end of the cell main body, and the blank area of the negative electrode tab is positioned at the other end of the cell main body, which is opposite to the blank area of the positive electrode tab;
anodal ear lid is located electric core main part surface, and one end welds in anodal ear blank region, and the other end surpasss negative pole ear blank region and to the outside extension of negative pole ear blank region, the negative pole ear welds in negative pole ear blank region and to the outside extension of negative pole ear blank region, or, anodal ear welds in anodal ear blank region and to the outside extension of anodal ear blank region, electric core main part surface is located to the negative pole ear lid, and one end welds in negative pole ear blank region, and the other end surpasss anodal ear blank region and to the outside extension of anodal ear blank region.
2. The lithium ion battery cell of claim 1, wherein: under the condition that the positive lug cover is arranged on the outer surface of the electric core main body, the positive lug comprises a positive welding area, a positive transition area, a positive connecting area and a positive lug area which are arranged along the length direction; the positive electrode welding area covers part or all of the positive electrode lug blank area and is welded to the positive electrode lug blank area; the positive electrode transition region covers at least partial region of the cell main body corresponding to the positive electrode active region or the negative electrode active region; the positive electrode connecting region covers at least part of the negative electrode ear blank region; the positive electrode lug area exceeds the negative electrode lug blank area and extends towards the outside of the negative electrode lug blank area; the negative electrode lug comprises a negative electrode welding area and a negative electrode lug area which are arranged along the length direction; the negative electrode welding area is welded on the blank area of the negative electrode lug; the negative electrode ear region extends to the outside of the blank region of the negative electrode ear.
3. The lithium ion battery cell of claim 2, wherein: the surface of the positive electrode transition region and/or the positive electrode connecting region is coated with an insulating coating.
4. The lithium ion battery cell of claim 2, wherein: the thickness size range of the positive electrode welding area and the positive electrode connecting area is 0.01mm-1mm, and the thickness size range of the positive electrode transition area is 0.01mm-0.1 mm.
5. The lithium ion battery cell of claim 1, wherein: under the condition that the negative electrode lug cover is arranged on the outer surface of the battery core main body, the positive electrode lug comprises a positive electrode welding area and a positive electrode lug area which are arranged along the length direction; the positive electrode welding area is welded on the blank area of the positive electrode lug; the positive electrode lug area extends to the outside of the blank area of the positive electrode lug; the negative electrode lug comprises a negative electrode welding area, a negative electrode transition area, a negative electrode connecting area and a negative electrode lug area which are arranged along the length direction; the negative electrode welding area covers part or all of the area of the negative electrode ear blank area and is welded to the negative electrode ear blank area; the negative electrode transition region covers at least partial region of the cell main body corresponding to the positive electrode active region or the negative electrode active region; the negative electrode connecting area covers at least part of the blank area of the positive electrode ear; the negative pole ear area exceeds the blank area of the positive pole ear and extends to the outside of the blank area of the positive pole ear.
6. The lithium ion battery cell of claim 4, wherein: and the surface of the negative electrode transition region and/or the negative electrode connecting region is coated with an insulating coating.
7. The lithium ion battery cell of claim 6, wherein: the thickness size range of the negative electrode welding area and the negative electrode connecting area is 0.01mm-1mm, and the thickness size range of the negative electrode transition area is 0.01mm-0.1 mm.
8. The lithium-ion battery cell of any of claims 1-7, wherein: the blank areas of the positive electrode tabs of all the positive electrode plates are connected by welding, and the blank areas of the negative electrode tabs of all the negative electrode plates are connected by welding.
9. The lithium-ion battery cell of any of claims 1-7, wherein: the width of the diaphragm is slightly larger than the width of the positive plate and the negative plate; the length of the diaphragm is greater than that of the positive electrode active area or the negative electrode active area, and the length of the diaphragm is less than that of the positive electrode plate or the negative electrode plate.
10. A lithium ion battery, characterized by: the lithium ion battery cell of any of claims 1-9, further comprising a packaging housing and an electrolyte.
CN202110237508.3A 2021-03-03 2021-03-03 Lithium ion battery core and lithium ion battery adopting same Active CN112952034B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110237508.3A CN112952034B (en) 2021-03-03 2021-03-03 Lithium ion battery core and lithium ion battery adopting same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110237508.3A CN112952034B (en) 2021-03-03 2021-03-03 Lithium ion battery core and lithium ion battery adopting same

Publications (2)

Publication Number Publication Date
CN112952034A true CN112952034A (en) 2021-06-11
CN112952034B CN112952034B (en) 2023-06-02

Family

ID=76247516

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110237508.3A Active CN112952034B (en) 2021-03-03 2021-03-03 Lithium ion battery core and lithium ion battery adopting same

Country Status (1)

Country Link
CN (1) CN112952034B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101521294A (en) * 2008-10-10 2009-09-02 比亚迪股份有限公司 Power battery for electric vehicle
CN204577523U (en) * 2015-05-19 2015-08-19 宁德时代新能源科技有限公司 A kind of electrode plates and comprise the battery core of this electrode plates
CN109860881A (en) * 2017-06-28 2019-06-07 湖南妙盛汽车电源有限公司 A kind of thermal conductivity lithium ion battery
WO2019187130A1 (en) * 2018-03-30 2019-10-03 株式会社 東芝 Electrode group, battery, and battery pack

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101521294A (en) * 2008-10-10 2009-09-02 比亚迪股份有限公司 Power battery for electric vehicle
CN204577523U (en) * 2015-05-19 2015-08-19 宁德时代新能源科技有限公司 A kind of electrode plates and comprise the battery core of this electrode plates
CN109860881A (en) * 2017-06-28 2019-06-07 湖南妙盛汽车电源有限公司 A kind of thermal conductivity lithium ion battery
WO2019187130A1 (en) * 2018-03-30 2019-10-03 株式会社 東芝 Electrode group, battery, and battery pack

Also Published As

Publication number Publication date
CN112952034B (en) 2023-06-02

Similar Documents

Publication Publication Date Title
CN113381058B (en) Lithium ion battery
JP3819785B2 (en) Battery
JP5417241B2 (en) Rectangular lithium ion secondary battery and method for manufacturing prismatic lithium ion secondary battery
US6451472B1 (en) Lithium battery and manufacturing method thereof
JP5456542B2 (en) Rectangular secondary battery and method for manufacturing prismatic secondary battery
CN106601960A (en) Button battery and manufacturing method therefor
CN113471631A (en) Electrochemical device and electronic device including the same
KR101517062B1 (en) Process for Preparation of Secondary Battery
CN115986335A (en) Electrode terminal, current collecting assembly and cylindrical battery
CN214254489U (en) Electrode assembly, battery cell, battery and power consumption device
CN216563208U (en) Negative plate and battery cell
JP2000260478A (en) Nonaqueous secondary battery
CN111211358A (en) Multi-lug quick-charging cylindrical lithium battery
CN112563579A (en) High-safety high-capacity lithium ion battery laminated cell and preparation method thereof
CN114335407A (en) Pole piece and battery
KR101515672B1 (en) Electrode assembly including anode and cathod electrode more than 2 and electrochemical device using the same
JP7225287B2 (en) SECONDARY BATTERY AND METHOD FOR MANUFACTURING SECONDARY BATTERY
CN112952034B (en) Lithium ion battery core and lithium ion battery adopting same
JP4092543B2 (en) Non-aqueous secondary battery
CN211605338U (en) Multi-lug quick-charging cylindrical lithium battery
CN112164830A (en) Button lithium battery containing solid electrolyte and manufacturing method thereof
TW472425B (en) Rechargeable battery structure and its manufacturing method
JP2004234994A (en) Lithium secondary battery, battery pack of same, and electrode of same
KR20210112193A (en) The Electrode Assembly And The Method For Manufacturing Thereof
CN112670677A (en) Battery unit for electric vehicle and method for manufacturing same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant