CN106654348B - Lithium battery - Google Patents

Lithium battery Download PDF

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Publication number
CN106654348B
CN106654348B CN201710089780.5A CN201710089780A CN106654348B CN 106654348 B CN106654348 B CN 106654348B CN 201710089780 A CN201710089780 A CN 201710089780A CN 106654348 B CN106654348 B CN 106654348B
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China
Prior art keywords
coiled material
diaphragm
adhesive tape
end edge
insulating adhesive
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CN201710089780.5A
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Chinese (zh)
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CN106654348A (en
Inventor
金容升
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Nantong Naiweite Power Supply Co ltd
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Nantong Naiweite Power Supply 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Primary Cells (AREA)

Abstract

The invention relates to a lithium battery, which comprises a battery shell, wherein a battery core coiled material is arranged in the battery shell, the battery core coiled material comprises an anode coiled material, a cathode coiled material and a diaphragm, and the diaphragm is arranged between the anode coiled material and the cathode coiled material; an upper insulating adhesive tape is connected between the upper end of the positive coiled material and the upper end of the diaphragm, and the upper insulating adhesive tape connects the upper end edge of the positive coiled material and the upper end edge of the diaphragm together; a lower insulating adhesive tape is connected between the lower end of the negative electrode coiled material and the lower end of the diaphragm, and the lower insulating adhesive tape connects the lower end edge of the negative electrode coiled material and the lower end edge of the diaphragm together; the insulating tape is made of thermoplastic elastomer TPE. The upper end edge and the lower end edge of the diaphragm are fixed, the contact of the anode coiled material and the cathode coiled material is prevented from being short-circuited, and the safe use of the battery is ensured.

Description

Lithium battery
Technical Field
The present invention relates to a lithium battery.
Background
The lithium battery is very widely used now, and the most important problem that traditional lithium battery exists is that the explosion of breaking circuit takes place easily, and the battery roll core in the lithium battery mainly includes positive negative pole coiled material and presss from both sides the diaphragm between two coiled materials, and when the upper and lower both ends at the roll core, the diaphragm is not fixed, along with battery ageing, break circuit, electric current are unstable, and the upper and lower terminal limit shrink of diaphragm to the upper and lower terminal limit contact that makes positive negative pole coiled material takes place to break circuit, causes the battery explosion.
Disclosure of Invention
The invention aims to solve the technical problems that: the lithium battery overcomes the defects of the prior art, and solves the defects that the upper end and the lower end of a diaphragm in the prior battery are easy to shrink and age.
The technical scheme adopted for solving the technical problems is as follows: the lithium battery comprises a battery shell, wherein a battery core coiled material is arranged in the battery shell, the battery core coiled material comprises an anode coiled material, a cathode coiled material and a diaphragm, and the diaphragm is arranged between the anode coiled material and the cathode coiled material;
an upper insulating adhesive tape is connected between the upper end of the positive coiled material and the upper end of the diaphragm, and the upper insulating adhesive tape connects the upper end edge of the positive coiled material and the upper end edge of the diaphragm together; a lower insulating adhesive tape is connected between the lower end of the negative electrode coiled material and the lower end of the diaphragm, and the lower insulating adhesive tape connects the lower end edge of the negative electrode coiled material and the lower end edge of the diaphragm together;
the insulating tape is made of thermoplastic elastomer TPE.
Further, the upper end edge and the lower end of the positive coiled material respectively form a light foil area, the outer side end surface of the light foil area at the upper end of the positive coiled material forms a first step groove, and the inner side end surface of the light foil area at the lower end edge of the positive coiled material forms a second step groove;
the upper end edge and the lower end of the negative electrode coiled material respectively form a light foil area, the outer side end surface of the light foil area at the upper end of the negative electrode coiled material forms a third step groove, and the inner side end surface of the light foil area at the lower end edge of the negative electrode coiled material forms a fourth step groove;
when the positive coiled material, the negative coiled material and the diaphragm are coiled into the battery core coiled material, one end of the upper insulating adhesive tape is positioned in the first step groove, and the other end of the upper insulating adhesive tape is positioned in the third step groove; one end of the lower insulating adhesive tape is positioned in the second step groove, and the other end of the lower insulating adhesive tape is positioned in the fourth step groove.
Further, the thickness of the insulating tape is 2-50 μm.
Further, the insulating tape comprises a thermoplastic elastomer layer and an adhesive layer, wherein the thickness of the elastomer layer is 1-40 mu m.
The beneficial effects of the invention are as follows: the upper end edge and the lower end edge of the diaphragm are fixed, the contact of the anode coiled material and the cathode coiled material is prevented from being short-circuited, and the safe use of the battery is ensured.
The insulating tape is made of thermoplastic elastomer, and when the battery cell is at a high temperature of 100 ℃ or above 100 ℃, the battery cell begins to soften and melt, so that the battery cell has obvious viscosity. The insulating tape stuck on the coiled material of the positive electrode and the negative electrode can adhere the pole piece and the diaphragm together, plays a certain role in inhibiting the contraction of the diaphragm, and has higher safety performance.
Because the insulating tape has good elasticity, when the battery falls down and is impacted, the insulating tape can play a role in buffering through deformation and can partially absorb the impact energy.
The arrangement of each step groove can enable the true negative coiled material to be still flat after being connected with the insulating tape.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic illustration of a cell coil in a lithium battery;
wherein, 1, positive coiled material, 2, negative coiled material, 3, diaphragm, 4, upper insulating tape. 5. And (3) lower insulating adhesive tape.
Detailed Description
The invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic views illustrating the basic structure of the present invention by way of illustration only, and thus show only the constitution related to the present invention.
As shown in fig. 1, a lithium battery comprises a battery shell, wherein a battery core coiled material is arranged in the battery shell, the battery core coiled material comprises a positive coiled material 1, a negative coiled material 2 and a diaphragm 3, and the diaphragm 3 is arranged between the positive coiled material 1 and the negative coiled material 2; an upper insulating adhesive tape 4 is connected between the upper end of the positive coiled material 1 and the upper end of the diaphragm 3, and the upper insulating adhesive tape 4 connects the upper end edge of the positive coiled material 1 and the upper end edge of the diaphragm 3 together; a lower insulating adhesive tape 5 is connected between the lower end of the negative electrode coiled material 2 and the lower end of the diaphragm 3, and the lower insulating adhesive tape 5 connects the lower end edge of the negative electrode coiled material 2 and the lower end edge of the diaphragm 3 together; the insulating tape is made of thermoplastic elastomer TPE.
The upper end edge and the lower end of the positive coiled material 1 respectively form a light foil area, the outer side end surface of the light foil area at the upper end of the positive coiled material 1 forms a first step groove, and the inner side end surface of the light foil area at the lower end edge of the positive coiled material 1 forms a second step groove; the upper end edge and the lower end of the negative electrode coiled material 2 respectively form a light foil area, the outer side end surface of the light foil area at the upper end of the negative electrode coiled material 2 forms a third step groove, and the inner side end surface of the light foil area at the lower end edge of the negative electrode coiled material 2 forms a fourth step groove; when the positive coiled material 1, the negative coiled material 2 and the diaphragm 3 are coiled into a battery core coiled material, one end of the upper insulating adhesive tape 4 is positioned in the first step groove, and the other end of the upper insulating adhesive tape 4 is positioned in the third step groove; one end of the lower insulating tape 5 is positioned in the second step groove, and the other end of the lower insulating tape 5 is positioned in the fourth step groove.
The thickness of the insulating tape is 2-50 μm. The insulating tape comprises a thermoplastic elastomer layer and an adhesive layer, wherein the thickness of the elastomer layer is 1-40 mu m.
According to the lithium battery, the upper end edge and the lower end edge of the diaphragm 3 are fixed, so that the contact of the anode coiled material and the cathode coiled material is prevented from generating short circuit, and the safe use of the battery is ensured. The insulating tape is made of thermoplastic elastomer, and when the battery cell is at a high temperature of 100 ℃ or above 100 ℃, the battery cell begins to soften and melt, so that the battery cell has obvious viscosity. The insulating tape stuck on the coiled material of the positive electrode and the negative electrode can adhere the pole piece and the diaphragm 3 together, plays a certain role in inhibiting the contraction of the diaphragm 3, and has higher safety performance.
Because the insulating tape has good elasticity, when the battery falls down and is impacted, the insulating tape can play a role in buffering through deformation and can partially absorb the impact energy. The arrangement of each step groove can enable the anode coiled material and the cathode coiled material to be still flat after being connected with the insulating adhesive tape.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (2)

1. The lithium battery is characterized by comprising a battery shell, wherein a battery core coiled material is arranged in the battery shell, the battery core coiled material comprises an anode coiled material (1), a cathode coiled material (2) and a diaphragm (3), and the diaphragm (3) is arranged between the anode coiled material (1) and the cathode coiled material (2);
an upper insulating adhesive tape (4) is connected between the upper end of the positive coiled material (1) and the upper end of the diaphragm (3), and the upper insulating adhesive tape (4) connects the upper end edge of the positive coiled material (1) with the upper end edge of the diaphragm (3); a lower insulating adhesive tape (5) is connected between the lower end of the negative electrode coiled material (2) and the lower end of the diaphragm (3), and the lower insulating adhesive tape (5) connects the lower end edge of the negative electrode coiled material (2) with the lower end edge of the diaphragm (3);
the insulating tape is made of thermoplastic elastomer TPE;
the upper end edge and the lower end of the positive coiled material (1) respectively form a light foil area, the outer side end surface of the light foil area at the upper end of the positive coiled material (1) forms a first step groove, and the inner side end surface of the light foil area at the lower end edge of the positive coiled material (1) forms a second step groove;
the upper end edge and the lower end of the negative electrode coiled material (2) respectively form a light foil area, the outer side end surface of the light foil area at the upper end of the negative electrode coiled material (2) forms a third step groove, and the inner side end surface of the light foil area at the lower end edge of the negative electrode coiled material (2) forms a fourth step groove;
when the positive coiled material (1), the negative coiled material (2) and the diaphragm (3) are coiled into a battery core coiled material, one end of the upper insulating adhesive tape (4) is positioned in the first step groove, and the other end of the upper insulating adhesive tape (4) is positioned in the third step groove; one end of the lower insulating adhesive tape (5) is positioned in the second step groove, and the other end of the lower insulating adhesive tape (5) is positioned in the fourth step groove;
the thickness of the insulating adhesive tape is 2-50 mu m.
2. The lithium battery of claim 1, wherein the insulating tape comprises a thermoplastic elastomer layer and an adhesive layer, and the thickness of the elastomer layer is 1-40 μm.
CN201710089780.5A 2017-02-20 2017-02-20 Lithium battery Active CN106654348B (en)

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CN106654348B true CN106654348B (en) 2023-05-30

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109193025B (en) * 2018-10-12 2021-12-10 桑顿新能源科技(长沙)有限公司 Lithium ion battery with high-safety pole piece and manufacturing method thereof
CN110212250A (en) * 2019-06-01 2019-09-06 珠海冠宇电池有限公司 A kind of lithium battery electric core
CN112582753A (en) * 2019-09-12 2021-03-30 比亚迪股份有限公司 Battery diaphragm, battery module, battery package and car
CN213520076U (en) * 2020-08-31 2021-06-22 珠海冠宇电池股份有限公司 Lithium ion battery cell

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1154144A (en) * 1997-07-31 1999-02-26 Matsushita Electric Ind Co Ltd Square battery and manufacture therefor
JP2003168411A (en) * 2001-12-04 2003-06-13 Hitachi Maxell Ltd Nonaqueous secondary battery
EP2136429A1 (en) * 2008-06-20 2009-12-23 Samsung SDI Co., Ltd. Electrode assembly and lithium secondary battery with same
CN101867070A (en) * 2009-04-15 2010-10-20 比亚迪股份有限公司 Lithium ion battery and preparation method thereof
CN206461043U (en) * 2017-02-20 2017-09-01 南通耐维特电源有限公司 Lithium battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1154144A (en) * 1997-07-31 1999-02-26 Matsushita Electric Ind Co Ltd Square battery and manufacture therefor
JP2003168411A (en) * 2001-12-04 2003-06-13 Hitachi Maxell Ltd Nonaqueous secondary battery
EP2136429A1 (en) * 2008-06-20 2009-12-23 Samsung SDI Co., Ltd. Electrode assembly and lithium secondary battery with same
CN101867070A (en) * 2009-04-15 2010-10-20 比亚迪股份有限公司 Lithium ion battery and preparation method thereof
CN206461043U (en) * 2017-02-20 2017-09-01 南通耐维特电源有限公司 Lithium battery

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