WO2021031494A1 - 超薄锂电池 - Google Patents

超薄锂电池 Download PDF

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Publication number
WO2021031494A1
WO2021031494A1 PCT/CN2019/128355 CN2019128355W WO2021031494A1 WO 2021031494 A1 WO2021031494 A1 WO 2021031494A1 CN 2019128355 W CN2019128355 W CN 2019128355W WO 2021031494 A1 WO2021031494 A1 WO 2021031494A1
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WIPO (PCT)
Prior art keywords
layer
lithium battery
packaging film
ultra
thickness
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PCT/CN2019/128355
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English (en)
French (fr)
Inventor
徐立球
徐世爱
江灿灿
周立军
邱耀忠
黄利
黄永水
韩永洪
Original Assignee
连云港德立信电子科技有限公司
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Application filed by 连云港德立信电子科技有限公司 filed Critical 连云港德立信电子科技有限公司
Priority to KR1020217034410A priority Critical patent/KR102675345B1/ko
Priority to JP2022600013U priority patent/JP3238559U/ja
Publication of WO2021031494A1 publication Critical patent/WO2021031494A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/1243—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the internal coating on the 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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

Definitions

  • the invention relates to a lithium battery technology, in particular to an ultra-thin lithium battery.
  • Traditional lithium batteries are all made of flexible packaging aluminum-plastic composite films, lithium battery cores, battery current collectors and battery tabs through heat sealing.
  • the flexible packaging aluminum-plastic composite films need to be cold stamped to a depth of 1mm or more, and These batteries have a large capacity and generate high temperatures during charging, discharging and use. Such cold-drawing performance and high-temperature resistance determine that the structural design of the existing lithium battery soft packaging film cannot meet the needs of ultra-thin lithium batteries.
  • the current collector in the battery cell is welded to the battery tabs.
  • the traditional tab metal tapes are relatively thick, and they are equipped with two upper and lower tabs. The tabs are then heat-sealed with two flexible packaging aluminum-plastic composite films.
  • the technical problem to be solved by the present invention is to aim at the shortcomings of the prior art and propose an ultra-thin lithium battery with high energy density and low cost.
  • An ultra-thin lithium battery is characterized by: including a battery core and a packaging film,
  • the packaging film is a positive electrode packaging film and/or a negative electrode packaging film die-cut from a lithium battery packaging film,
  • the lithium battery packaging film is a composite of an outer protective layer and an inner metal layer, and at least a chemically treated anti-corrosion layer is provided on the inner surface of the metal layer,
  • the polar material layer of the battery core is attached to the inner surface of the anti-corrosion layer of the metal layer of the packaging film, and the metal layer of the packaging film serves as the current collector of the lithium battery;
  • a hot-melt sealing rubber ring is arranged between the two packaging films around the battery core for heat sealing and bonding between the two packaging films to form a lithium battery.
  • the battery core includes one or more sets of chips, and each set of chips includes a positive polarity material layer, an intermediate separator layer and a negative polarity material layer;
  • each set of chips includes a positive polarity material layer, an intermediate separator layer and a negative polarity material layer;
  • the material layers of the same polarity between adjacent chips are arranged oppositely, and a current collector material layer with tabs is arranged between the two material layers of the same polarity.
  • the technical problem to be solved by the present invention can be further realized by the following technical solutions.
  • the current collector material layer is a negative electrode
  • a copper foil layer is used, and the thickness is 5-20 ⁇ m.
  • Both surfaces of the copper foil layer are provided with anti-corrosion layers through chemical treatment.
  • the technical problem to be solved by the present invention can be further realized by the following technical solutions.
  • the current collector material layer is a positive electrode
  • an aluminum foil layer is used, and the thickness is 7-20 ⁇ m.
  • Both surfaces of the aluminum foil layer are provided with anti-corrosion layers through chemical treatment.
  • An adhesive layer is arranged between the outer protective layer and the inner metal layer of the lithium battery packaging film.
  • the technical problem to be solved by the present invention can be further realized by the following technical solutions.
  • the outer protective layer of the lithium battery packaging film is a PET layer or a nylon layer, and the thickness is 8-20 ⁇ m.
  • the technical problem to be solved by the present invention can also be further realized by the following technical solutions.
  • the metal layer of the negative electrode packaging film is a copper foil layer with a thickness of 10-30 ⁇ m or a stainless steel layer with a thickness of 6-20 ⁇ m;
  • the metal layer of the diaphragm is an aluminum foil layer with a thickness of 16-30 ⁇ m.
  • the technical problem to be solved by the present invention can be further realized by the following technical solutions.
  • the hot-melt sealing rubber ring is a modified PE rubber ring or a modified PP rubber ring.
  • the technical problem to be solved by the present invention can be further realized by the following technical solutions, and the thickness of the anti-corrosion layer is 0.01-0.1 ⁇ m.
  • the present invention adopts a brand new packaging film structure.
  • One is that there is no inner film layer, which reduces the thickness of the battery; the other is that the inner surface of the metal is used as the current collector of the lithium battery, which saves two layers of current collectors and greatly reduces The thickness of the battery; the third is to directly use the metal layer as a tab by die cutting, which not only saves the cost of the traditional tab, but also does not account for the thickness of the battery, and also saves the welding process between the traditional tab and the current collector .
  • the invention realizes an ultra-thin manufacturing process, low cost, and high battery energy density. Due to the ultra-thin design structure, the battery has a certain degree of flexibility and can be bent into an arc or S shape, which is more convenient to be used in the structural design of electronic products later, and can greatly expand the application field and scope of lithium batteries.
  • Figure 1 is a schematic diagram of the structure of the present invention
  • Figure 2 is a schematic diagram of a lithium battery packaging film structure
  • Figure 3 is a schematic diagram of the second structure of a lithium battery packaging film
  • Figure 4 is a structural diagram of a single-chip battery
  • Figure 5 is a structure diagram of a dual-chip battery
  • Figure 6 is a three-chip battery structure diagram.
  • An ultra-thin lithium battery including a battery core and a packaging film
  • the packaging film 1 is a positive electrode packaging film and/or a negative electrode packaging film die-cut from a lithium battery packaging film,
  • the lithium battery packaging film is a composite of an outer protective layer 7 and an inner metal layer 9, and at least an anti-corrosion layer 10 through chemical treatment is provided on the inner surface of the metal layer.
  • the polar material layer of the battery core is attached to the inner surface of the anti-corrosion layer of the metal layer of the packaging film, and the metal layer of the packaging film serves as the current collector of the lithium battery;
  • metal layer tape 2 that is directly reserved during die cutting and used as battery tabs.
  • a hot-melt sealing rubber ring 6 is arranged between the two packaging films around the battery core for heat sealing and bonding between the two packaging films to form a lithium battery.
  • the battery core includes one or more sets of chips, and each set of chips includes a positive polarity material layer 3, an intermediate separator layer 4, and a negative polarity material layer 5; when the battery core is multiple sets of chips, the gap between adjacent chips.
  • the material layers of the same polarity are arranged oppositely, and a current collector material layer with tabs is arranged between the two material layers of the same polarity.
  • the current collector material layer is a negative electrode
  • a copper foil layer is used, and the thickness is 5-20 ⁇ m.
  • Both surfaces of the copper foil layer are provided with anti-corrosion layers through chemical treatment.
  • the current collector material layer is a positive electrode
  • an aluminum foil layer is used, and the thickness is 7-20 ⁇ m.
  • Both surfaces of the aluminum foil layer are provided with anti-corrosion layers through chemical treatment.
  • An adhesive layer 8 is provided between the outer protective layer and the inner metal layer of the lithium battery packaging film.
  • the outer protective layer of the lithium battery packaging film is a PET layer or a nylon layer with a thickness of 8-20 ⁇ m.
  • the metal layer of the negative electrode packaging film is a copper foil layer with a thickness of 10-30 ⁇ m or a stainless steel layer with a thickness of 6-20 ⁇ m; the metal layer of the positive electrode packaging film is an aluminum foil layer with a thickness of 16-30 ⁇ m.
  • the hot melt sealing rubber ring is a modified PE rubber ring or a modified PP rubber ring.
  • the thickness of the anti-corrosion layer is 0.01-0.1 ⁇ m.
  • the hot melt sealing rubber ring is a modified PE rubber ring or a modified PP rubber ring.
  • the thickness of the hot-melt sealing rubber ring is less than or equal to the total thickness of the battery core, and the width of the frame of the hot-melt sealing rubber ring is 1 to 2 mm.
  • the middle diaphragm layer of the chip is PE or PP modified by acid anhydride, which can have a strong hot-melt bonding effect with metal.
  • the above-mentioned intermediate diaphragm layer can be directly used as a hot-melt sealing rubber ring.
  • Hot melt sealing rubber ring can be divided into two layers.
  • the periphery of the lithium battery is sealed, and suitable insulating glue is applied to the exposed part of the edge after cutting to prevent external contact short-circuit.
  • the packaging film is die-cut from the lithium battery packaging film, and the metal layer is drawn out and used directly as a tab.
  • the surface of the metal layer is chemically treated as an anti-corrosion layer that uses a mixed solution of chromium salt, acid and fluoride to chemically treat the surface of the metal layer to form a dense metal oxide film on the surface of the metal layer with a thickness of 0.2 ⁇ m-1.2 ⁇ m;
  • the chromium salt is one of potassium dichromate, chromium oxide, and sodium dichromate or a mixture of any two, and the mass percentage concentration of the chromium salt in the mixed solution is 0.2%-1.2%;
  • the acid It is one of hydrochloric acid, sulfuric acid, phosphoric acid or a mixture of any two, the concentration of the acid in the mixed solution is 3%-15% by mass;
  • the fluoride is one of ammonium fluoride, potassium fluoride, and sodium fluoride One or any combination of two, the mass percentage concentration of fluoride in the mixed solution is 0.1%-1%.
  • Figure 4 is a structural diagram of a single-chip battery
  • Figure 5 is a structural diagram of a dual-chip battery; when the current collector material layer is a negative electrode, a copper foil layer is used, and the thickness is 5-20 ⁇ m. Both surfaces of the copper foil layer can be provided with anti-corrosion layers through chemical treatment. The tabs are extended from the current collector material layer.
  • Figure 6 is a three-chip battery structure diagram.
  • the current collector material layer is a negative electrode
  • a copper foil layer is used, and the thickness is 5-20 ⁇ m.
  • the two surfaces of the copper foil layer are provided with anti-corrosion layers through chemical treatment.
  • the current collector material layer is a positive electrode
  • an aluminum foil layer is used, and the thickness is 7-20 ⁇ m. Both surfaces of the aluminum foil layer are provided with anti-corrosion layers through chemical treatment.
  • the tabs are extended from the current collector material layer.
  • the battery Due to the ultra-thin design structure, the battery has a certain degree of flexibility and can be bent into an arc or S shape, which is more convenient to be used in the structural design of electronic products later, and can greatly expand the application field and scope of lithium batteries.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Secondary Cells (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种超薄锂电池，包括电池芯和包装膜片（1），包装膜片（1）包括带正极耳的正极包装膜片和带负极耳的负极包装膜片，锂电池包装膜片（1）是由外层保护层（7）和内层金属层（9）复合而成，至少在金属层（9）的内表面设有通过化学处理的防腐蚀层（10），包装膜片（1）的金属层（9）既作为锂电池集流体又引出形成极耳。包装膜结构没有内膜层，将金属的内表面作为锂电池的集流体并引出直接作为极耳使用，省掉了极耳与集流体之间的焊接工艺，降低了锂电池的厚度。实现了厚度超薄的制作工艺，低成本，电池能量密度大。电池具有一定的柔软性，可以弯曲，更方便在后面用于电子产品的结构设计中，可大大扩展锂电池的应用领域和范围。

Description

超薄锂电池 技术领域
本发明涉及一种锂电池技术，特别是一种超薄锂电池。
背景技术
传统的锂电池均是由外面软包装铝塑复合膜、锂电池芯、电芯内集流体和电池极耳通过热封组合而成，其软包装铝塑复合膜均需冷冲压成型深度1mm以上，以及这些电池容量较大，充放电及使用时会发热产生高温等，这种冷冲深性能和耐高温性能决定了现有锂电池软包装膜的结构设计无法满足超薄锂电池的需要。电芯内集流体和电池极耳焊接，传统极耳金属带都相对较厚，而且都设有上下两层极耳胶，极耳胶再与两层软包装铝塑复合膜进行热封，这将严重影响电池的总厚度及能量密度。
发明内容
本发明要解决的技术问题是针对现有技术的不足，提出了一种能量密度大、低成本的超薄锂电池。
本发明要解决的技术问题是通过以下技术方案来实现的，一种超薄锂电池，其特点是：包括电池芯和包装膜片，
所述包装膜片是由锂电池包装膜模切而成的正极包装膜片和/或负极包装膜片，
所述锂电池包装膜是由外层保护层和内层金属层复合而成，至少在金属层的内表面设有通过化学处理的防腐蚀层，
所述电池芯的极性材料层附着在包装膜片金属层的防腐蚀层的内表面，包装膜片的金属层作为锂电池的集流体；
在包装膜片的边侧部设有模切时直接留出的用作电池极耳的金属层带，
在电池芯四周的两包装膜片之间设有热熔密封胶圈，用于两包装膜片之间的热封粘合，形成锂电池。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述电池芯包括一组或多组芯片，每组芯片均包括正极性材料层、中间隔膜层和负极性材料层；所述电池芯为多组芯片时，相邻芯片之间的同极性材料层相对设置，并在两同极性材料层之间设有带极耳的集流体材料层。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述集流体材料层为负极时采用铜箔层，厚度为5～20μm。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，在所述铜箔层两个表面均设有通过化学处理的防腐蚀层。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述集流体材料层为正极时采用铝箔层，厚度为7～20μm。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，在所述铝箔层两个表面均设有通过化学处理的防腐蚀层。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，锂电池包装膜的外层保护层和内层金属层之间设有粘合剂层。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述锂电池包装膜的外层保护层为PET层或尼龙层，厚度为8～20μm。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述负极包装膜片的金属层为厚度10～30μm的铜箔层或采用厚度为6～20μm的不锈钢层；所述正极包装膜片的金属层为厚度16～30μm的铝箔层。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述热熔密封胶圈为改性PE胶圈或改性PP胶圈。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现，所述防腐蚀层厚度为0.01～0.1μm。
本发明采用了全新的包装膜结构，一是没有内膜层，降低了电池厚度；二是将金属的内表面作为锂电池的集流体使用，共省去了两层集流体，又大大降低了电池的厚度；三是将金属层模切引出直接作为极耳使用，既节省了传统极耳的成本，同时又不占电池的厚度，还省掉了传统极耳与集流体之间的焊接工艺。与现有技术相比，本发明实现了厚度超薄的制作工艺，低成本，电池能量密度大。由于超薄的设计结构，电池具有一定的柔软性，可以弯曲成弧形或S形等，更方便在后面用于电子产品的结构设计中，划可大大扩展锂电池的应用领域和范围。
附图说明
图1为本发明的结构简图；
图2为锂电池包装膜结构一示意图；
图3为锂电池包装膜结构二示意图；
图4为单组芯片电池结构图；
图5为双组芯片电池结构图；
图6为三组芯片电池结构图。
具体实施方式
以下进一步描述本发明的具体技术方案，以便于本领域的技术人员进一步地理解本发明，而不构成对其权利的限制。
一种超薄锂电池，包括电池芯和包装膜片，
所述包装膜片1是由锂电池包装膜模切而成的正极包装膜片和/或负极包装膜片，
所述锂电池包装膜是由外层保护层7和内层金属层9复合而成，至少在金属层的内表面设有通过化学处理的防腐蚀层10，
所述电池芯的极性材料层附着在包装膜片金属层的防腐蚀层的内表面，包装膜片的金属层作为锂电池的集流体；
在包装膜片的边侧部设有模切时直接留出的用作电池极耳的金属层带2，
在电池芯四周的两包装膜片之间设有热熔密封胶圈6，用于两包装膜片之间的热封粘合，形成锂电池。
所述电池芯包括一组或多组芯片，每组芯片均包括正极性材料层3、中间隔膜层4和负极性材料层5；所述电池芯为多组芯片时，相邻芯片之间的同极性材料层相对设置，并在两同极性材料层之间设有带极耳的集流体材料层。
所述集流体材料层为负极时采用铜箔层，厚度为5～20μm。
在所述铜箔层两个表面均设有通过化学处理的防腐蚀层。
所述集流体材料层为正极时采用铝箔层，厚度为7～20μm。
在所述铝箔层两个表面均设有通过化学处理的防腐蚀层。
锂电池包装膜的外层保护层和内层金属层之间设有粘合剂层8。
所述锂电池包装膜的外层保护层为PET层或尼龙层，厚度为8～20μm。
所述负极包装膜片的金属层为厚度10～30μm的铜箔层或采用厚度为6～20μm的不锈钢层；所述正极包装膜片的金属层为厚度16～30μm的铝箔层。
所述热熔密封胶圈为改性PE胶圈或改性PP胶圈。
所述防腐蚀层厚度为0.01～0.1μm。
所述热熔密封胶圈为改性PE胶圈或改性PP胶圈。热熔密封胶圈的厚度小于或等于电池芯的厚度总和，热熔密封胶圈边框的宽为1～2mm。
所述芯片的中间隔膜层为酸酐改性的PE或PP，能够与金属有很强热融粘接作用。上述的中间隔膜层可以直接用作热熔密封胶圈使用。
热熔密封胶圈可分为上下两层。
锂电池周边密封，在裁切后的边缘裸露部分刷上合适的绝缘胶，防止外部接触短路。
包装膜片由锂电池包装膜通过模切而成，金属层引出直接作为极耳使用。
金属层的表面通过化学处理的防腐蚀层是采用铬盐、酸、氟化物的混合溶液对金属层表面进行化学处理，在金属层表面形成的致密金属氧化物膜层，厚度为0.2μm-1.2μm；所述的铬盐为重铬酸钾、氧化铬、重铬酸钠的一种或者任意两种混合，铬盐在混合溶液里的质量百分比浓度为0.2％-1.2％；所述的酸为盐酸、硫酸、磷酸的一种或者任意两种混合，酸在混合溶液里的质量百分比浓度为3％-15％；所述的氟化物为氟化铵、氟化钾、氟化钠的一种或者任意两种混合，氟化物在混合溶液里的质量百分比浓度为0.1％-1％.
图4为单组芯片电池结构图；
图5为双组芯片电池结构图；所述集流体材料层为负极时采用铜箔层，厚度为5～20μm。所述在铜箔层两个表面均可以设置通过化学处理的防腐蚀层。由集流体材料层延伸出极耳条。
图6为三组芯片电池结构图。所述集流体材料层为负极时采用铜箔层，厚度为5～20μm。所述在铜箔层两个表面均设有通过化学处理的防腐蚀层。所述集流体材料层为正极时采用铝箔层，厚度为7～20μm。所述在铝箔层两个表面均设有通过化学处理的防腐蚀层。由集流体材料层延伸出极耳条。
由于超薄的设计结构，电池具有一定的柔软性，可以弯曲成弧形或S形等，更方便在后面用于电子产品的结构设计中，划可大大扩展锂电池的应用领域和范围。

Claims (10)

  1. 一种超薄锂电池，其特征在于：包括电池芯和包装膜片，
    所述包装膜片是由锂电池包装膜模切而成的正极包装膜片和/或负极包装膜片，
    所述锂电池包装膜是由外层保护层和内层金属层复合而成，至少在金属层的内表面设有通过化学处理的防腐蚀层，
    所述电池芯的极性材料层附着在包装膜片金属层的防腐蚀层的内表面，包装膜片的金属层作为锂电池的集流体；
    在包装膜片的边侧部设有模切时直接留出的用作电池极耳的金属层带，
    在电池芯四周的两包装膜片之间设有热熔密封胶圈，用于两包装膜片之间的热封粘合，形成锂电池。
  2. 根据权利要求1所述的超薄锂电池，其特征在于：所述电池芯包括一组或多组芯片，每组芯片均包括正极性材料层、中间隔膜层和负极性材料层；所述电池芯为多组芯片时，相邻芯片之间的同极性材料层相对设置，并在两同极性材料层之间设有带极耳的集流体材料层。
  3. 根据权利要求2所述的超薄锂电池，其特征在于：所述集流体材料层为负极时采用铜箔层，厚度为5～20μm。
  4. 根据权利要求3所述的超薄锂电池，其特征在于：在所述铜箔层两个表面均设有通过化学处理的防腐蚀层。
  5. 根据权利要求2所述的超薄锂电池，其特征在于：所述集流体材料层为正极时采用铝箔层，厚度为7～20μm。
  6. 根据权利要求5所述的超薄锂电池，其特征在于：在所述铝箔层两个表面均设有通过化学处理的防腐蚀层。
  7. 根据权利要求1所述的超薄锂电池，其特征在于：锂电池包装膜的外层保护层和内层金属层之间设有粘合剂层。
  8. 根据权利要求1所述的超薄锂电池，其特征在于：所述锂电池包装膜的外层保护层为PET层或尼龙层，厚度为8～20μm。
  9. 根据权利要求1所述的超薄锂电池，其特征在于：所述负极包装膜片的金属层为厚度10～30μm的铜箔层或采用厚度为6～20μm的不锈钢层；所述正极包装膜片的金属层为厚度16～30μm的铝箔层。
  10. 根据权利要求1所述的超薄锂电池，其特征在于：所述热熔密封胶圈为改性PE胶圈或改性PP胶圈。
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