CN113871808A - Soft package lithium ion battery and electronic device - Google Patents
Soft package lithium ion battery and electronic device Download PDFInfo
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- CN113871808A CN113871808A CN202111239038.0A CN202111239038A CN113871808A CN 113871808 A CN113871808 A CN 113871808A CN 202111239038 A CN202111239038 A CN 202111239038A CN 113871808 A CN113871808 A CN 113871808A
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- electrode tab
- aluminum
- positive electrode
- expansion part
- plastic film
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 69
- 239000002985 plastic film Substances 0.000 claims abstract description 100
- 229920006255 plastic film Polymers 0.000 claims abstract description 99
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 78
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000007789 sealing Methods 0.000 claims abstract description 59
- 238000009413 insulation Methods 0.000 claims abstract description 31
- 210000005056 cell body Anatomy 0.000 claims abstract description 28
- 238000004806 packaging method and process Methods 0.000 claims abstract description 19
- 210000004027 cell Anatomy 0.000 claims abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 34
- 238000005260 corrosion Methods 0.000 abstract description 34
- 239000010410 layer Substances 0.000 description 49
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052744 lithium Inorganic materials 0.000 description 11
- 230000002687 intercalation Effects 0.000 description 10
- 238000009830 intercalation Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 238000012217 deletion Methods 0.000 description 4
- 230000037430 deletion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000012466 permeate Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
- 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
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- 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
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
-
- 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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a soft package lithium ion battery and an electronic device. The soft package lithium ion battery comprises an aluminum plastic film and a battery cell, wherein the battery cell comprises a battery cell body, a positive electrode tab and a negative electrode tab, and one end of the positive electrode tab and one end of the negative electrode tab are respectively connected with the battery cell body; the battery cell body is sealed in a containing area of a packaging body formed by an aluminum plastic film, the top sealing end of the packaging body comprises a positive electrode lug expansion part and a non-expansion part, and the thickness of the positive electrode lug expansion part is greater than that of the non-expansion part; the top sealing end comprises a positive pole lug opening, one end of the positive pole lug opening is positioned in the positive pole lug expansion part, the other end of the positive pole lug opening is positioned in the non-expansion part, and the other end of the positive pole lug opening extends out of the positive pole lug opening; the minimum distance L between the positive electrode lug and the aluminum layer of the aluminum-plastic film is 0.1-50 mu m; the insulation impedance between the negative electrode tab and the aluminum-plastic film is greater than that between the positive electrode tab and the aluminum-plastic film. The soft package lithium ion battery can effectively inhibit the lithium-embedded corrosion of the aluminum plastic film.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and relates to a soft package lithium ion battery and an electronic device.
Background
The most common failure mode of the soft package lithium ion battery is that lithium intercalation corrosion occurs to an aluminum plastic film, and then the battery fails due to liquid leakage, gas expansion, package damage and the like.
The insulation impedance between the positive electrode and the aluminum-plastic film of the battery core and between the negative electrode and the aluminum-plastic film is usually hundreds of M omega to hundreds of G omega, such high impedance is equivalent to open circuit for any loop in the lithium ion battery, and the phenomenon of leakage current does not exist, but when abnormal conditions such as the deviation of a negative electrode tab during packaging, the penetration of a negative electrode sheet through a PP layer on the aluminum-plastic film, the bridging of an active substance or metal particles between the negative electrode sheet and the aluminum-plastic film and the like occur, the insulation impedance between the negative electrode and the aluminum-plastic film can be rapidly reduced to a plurality of omega to dozens of M omega, a leakage current channel can be formed when the impedance between the negative electrode and the aluminum-plastic film is less than 50M omega, if the potential of the negative electrode is less than 0.3V, the aluminum-plastic film, the negative electrode sheet, the electrolyte and the leakage current channel form a corrosion primary battery, wherein the aluminum-plastic film serves as the positive electrode and the negative electrode sheet of the corrosion primary battery, and under the driving of electric field force, lithium ions in the negative plate move to metal aluminum of the aluminum-plastic film through the electrolyte and are embedded into crystal lattices of the aluminum to form LixAn Al alloy. Because lithium intercalation corrosion is pitting corrosion, the corrosion rate is fast, and Li with extremely strong reducibility is corroded through the aluminum-plastic filmxAl reacts with external water vapor, oxygen, carbon dioxide and the like to generate LiF and Li with loose and porous structures2O、Li2CO3And the external water vapor can enter the battery cellThe battery core is partially accelerated to generate gas, and the internal electrolyte can permeate out, so that swelling and liquid leakage are caused.
Therefore, the development of the soft package lithium ion battery with the aluminum plastic film not easy to corrode is of great significance.
Disclosure of Invention
The invention provides a soft package lithium ion battery, which can greatly reduce the insulation impedance between a positive electrode lug and an aluminum-plastic film of the lithium ion battery by slightly dislocating the positive electrode lug by controlling the welding position of the positive electrode lug, and simultaneously control the insulation impedance between a negative electrode lug and the aluminum-plastic film to be larger than the insulation impedance between the positive electrode lug and the aluminum-plastic film, so that a protective primary battery is formed by the positive electrode plate and the aluminum-plastic film, and the lithium-embedded corrosion phenomenon of the aluminum-plastic film is avoided.
The invention also provides an electronic device which comprises the soft package lithium ion battery, and the aluminum plastic film of the soft package lithium ion battery is not easy to generate lithium intercalation corrosion, so that the electronic device has more excellent cycle performance and safety performance.
The invention provides a soft package lithium ion battery, which comprises an aluminum plastic film and a battery cell, wherein the battery cell comprises a battery cell body, a positive electrode lug and a negative electrode lug, and one end of the positive electrode lug and one end of the negative electrode lug are respectively connected with the battery cell body;
the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by the aluminum plastic film, the top sealing end of the packaging body comprises a positive electrode lug expansion part and a non-expansion part, and the thickness of the positive electrode lug expansion part is greater than that of the non-expansion part;
the top sealing end comprises a positive pole lug opening, one end of the positive pole lug opening is positioned in the positive pole lug expansion part, the other end of the positive pole lug opening is positioned in the non-expansion part, and the other end of the positive pole lug extends out of the positive pole lug opening;
the minimum distance between the positive electrode lug and the aluminum layer in the aluminum-plastic film is L, and L is 0.1-50 mu m;
the insulation impedance between the negative electrode tab and the aluminum-plastic film is greater than that between the positive electrode tab and the aluminum-plastic film.
The soft package lithium ion battery is characterized in that one end of the positive electrode tab opening in the positive electrode tab extension part is a first end, and the minimum distance between the first end and one end of the positive electrode tab extension part close to the first end is W1;
the end of the positive pole lug opening positioned in the non-expansion part is a second end, and the minimum distance between the second end and the end of the positive pole lug expansion part close to the second end is W2;
wherein W1+ W2 is 1.5-4 mm.
The soft package lithium ion battery is characterized in that L is 15-40 μm.
The soft package lithium ion battery is characterized in that W1+ W2 is 2.5-3.5 mm.
The soft package lithium ion battery is characterized in that the insulation resistance between the negative electrode tab and the aluminum plastic film is greater than 200M omega.
The soft package lithium ion battery is characterized in that the minimum distance L between the negative electrode tab and the aluminum layer in the aluminum plastic film is 140-.
The soft package lithium ion battery comprises a package body, wherein the top sealing end of the package body further comprises a negative electrode tab extension part, and the thickness of the negative electrode tab extension part is larger than that of a non-extension part;
the top seal end comprises a negative pole lug opening, the negative pole lug opening is located in the negative pole lug expansion portion, and the other end of the negative pole lug extends out of the negative pole lug opening.
The soft package lithium ion battery is characterized in that the other end of the positive electrode tab opening is positioned in the non-expansion part between the positive electrode tab expansion part and the negative electrode tab expansion part;
or the other end of the positive electrode tab opening is positioned at a non-expansion part which is far away from the positive electrode tab expansion part and the negative electrode tab expansion part and is close to the positive electrode tab expansion part.
The soft package lithium ion battery comprises a package body, wherein the package body further comprises a bottom sealing end, the bottom sealing end comprises a negative electrode tab expansion part, and the thickness of the negative electrode tab expansion part is larger than that of a non-expansion part;
the bottom sealing end comprises a negative pole lug opening, the negative pole lug opening is located in the negative pole lug expansion portion, and the other end of the negative pole lug extends out of the negative pole lug opening.
The invention also provides an electronic device which comprises the soft package lithium ion battery.
According to the soft package lithium ion battery, the positive electrode tab is slightly dislocated, the minimum distance L between the positive electrode tab and the aluminum layer in the aluminum-plastic film is controlled to be 0.1-50 mu M, the insulation impedance between the positive electrode tab and the aluminum-plastic film is controlled to be in the range of 0.5-50M omega, the insulation impedance between the negative electrode tab and the aluminum-plastic film is controlled to be larger than the insulation impedance between the positive electrode piece and the aluminum-plastic film, the soft package lithium ion battery can form a protection primary battery, the aluminum layer in the aluminum-plastic film serves as the negative electrode of the protection primary battery, and the positive electrode piece serves as the positive electrode of the protection primary battery, so that the phenomenon of lithium intercalation corrosion is avoided.
The electronic device of the invention has more excellent cycle performance and safety performance because of comprising the soft package lithium ion battery.
Drawings
Fig. 1 is a schematic structural diagram of a soft package lithium ion battery according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a top-sealing end of a package according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of a top-sealing end of a package according to yet another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a soft package lithium ion battery according to another embodiment of the present invention;
FIG. 5 is a cross-sectional view of a top-sealing structure of a package according to a comparative example of the present invention;
FIG. 6 is a graph comparing the time at which 30 soft-packed lithium ion battery samples according to the example of the invention show corrosion;
fig. 7 is a graph comparing the time to corrosion for 30 soft pack lithium ion battery samples of comparative examples of the present invention.
Description of reference numerals:
101: a cell body;
102: an aluminum-plastic film;
103: a positive electrode tab;
104: a negative electrode tab;
105: a first sealing layer;
106: an aluminum layer;
107: and a second sealing layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a soft package lithium ion battery, which comprises an aluminum plastic film and a battery cell, wherein the battery cell comprises a battery cell body, a positive electrode lug and a negative electrode lug, and one end of the positive electrode lug and one end of the negative electrode lug are respectively connected with the battery cell body;
the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by an aluminum plastic film, the top sealing end of the packaging body comprises a positive electrode lug expansion part and a non-expansion part, and the thickness of the positive electrode lug expansion part is greater than that of the non-expansion part;
the top sealing end comprises a positive pole lug opening, one end of the positive pole lug opening is positioned in the positive pole lug expansion part, the other end of the positive pole lug opening is positioned in the non-expansion part, and the other end of the positive pole lug extends out through the positive pole lug opening;
the minimum distance between the positive electrode lug and the aluminum layer in the aluminum plastic film is L, and L is 0.1-50 mu m;
the insulation impedance between the negative electrode tab and the aluminum-plastic film is greater than that between the positive electrode tab and the aluminum-plastic film.
Fig. 1 is a schematic structural diagram of a soft package lithium ion battery according to an embodiment of the present invention, and as shown in fig. 1, the soft package lithium ion battery includes an aluminum plastic film 101 and a battery cell, and the battery cell includes a battery cell body 102, a positive electrode tab 103 and a negative electrode tab 104, where one end of the positive electrode tab 103 and one end of the negative electrode tab 104 are respectively connected to the battery cell body 102.
The soft package lithium ion battery comprises a package body, wherein the package body comprises two layers of aluminum plastic films which are stacked, and the package body is obtained by packaging four edges of the stacked aluminum plastic films. Specifically, the aluminum-plastic film comprises a first sealing layer, an aluminum layer and a second sealing layer which are stacked, and in the process of packaging, after the second sealing layers of the two layers of aluminum-plastic films are stacked oppositely, the four edges are packaged by means of heat sealing and the like, so that the oppositely arranged second sealing layers are fused together to complete packaging, and the packaging body is obtained. It should be noted that, in the package of the present invention, the two aluminum plastic films stacked on each other have four edges, the second sealing layers disposed opposite to each other at the edges are heat-fused together, and the second sealing layer disposed opposite to each other at the middle but not at the edges is not processed, so that the periphery of the package is sealed and the middle of the package has a receiving area. Wherein, the holding area in the middle is the electric core body holding area, and the electric core body 102 is packaged in the electric core body holding area.
The invention is not limited to the material of the first sealing layer and the second sealing layer in the aluminum plastic film, for example, the material of the first sealing layer may be nylon (PA), polyethylene terephthalate (PET) or a composite of nylon and polyethylene terephthalate (PET), and the material of the second sealing layer may be selected from polypropylene (PP).
In the specific implementation process, the size of the battery cell body accommodating area can be adjusted according to the requirement of the battery cell size.
As mentioned above, one end of the positive electrode tab is connected to the cell body, and the other end of the positive electrode tab extends out of the package body and is located outside the package body. Specifically in the course of working, in order to make things convenient for stretching out of anodal utmost point ear, can arrange electric core in electric core body holding district earlier, make other end utmost point ear be located the plastic-aluminum membrane outside, then encapsulate to both guaranteed the sealed structure all around of packaging body, can realize again that the anodal utmost point ear other end stretches out the packaging body.
As shown in fig. 1, one end of the package body containing the positive electrode tab 103 is defined as a top sealed end of the package body, and two ends of the package body perpendicular to the top sealed end are respectively a first side sealed end and a second side sealed end.
Fig. 2 is a schematic cross-sectional view of a top-sealing end of a package according to an embodiment of the invention, as shown in fig. 2, the top-sealing end of the package includes an extended portion and a non-extended portion of a positive electrode tab, wherein the extended portion of the positive electrode tab has a thickness greater than that of the non-extended portion.
The top end of the package also includes a positive tab opening, and the size of the positive tab opening in the extending direction of the top end of the package (i.e., the direction of the length of the top seal segment) is substantially identical to the size of the positive tab 103 in that direction. In the extending direction of the top sealing end of the packaging body, one end of the positive pole lug opening is positioned in the positive pole lug extended part, and the other end of the positive pole lug opening is positioned in the non-extended part. In the extending direction perpendicular to the top end cap of the package body, the other end of the positive electrode tab 103 protrudes through the positive electrode tab opening.
The minimum distance between the positive electrode lug in the soft package lithium ion battery and the aluminum layer in the aluminum plastic film refers to the shortest distance between any point on the positive electrode lug and any point on the aluminum plastic film.
The inventor researches and discovers that the minimum distance between the positive electrode lug and an aluminum layer in the aluminum-plastic film is 0.1-50 mu M, and the insulation resistance between the positive electrode lug and the aluminum-plastic film is 0.5-50M omega when the positive electrode lug is slightly dislocated relative to the extended part of the positive electrode lug by positioning one open end of the positive electrode lug in the extended part of the positive electrode lug and positioning the other open end of the positive electrode lug in the non-extended part. And simultaneously, the insulation impedance of the negative electrode tab and the aluminum-plastic film is controlled to be larger than that of the positive electrode tab and the aluminum-plastic film, so that a leakage current channel can be formed between the positive plate and the aluminum-plastic film, and at the moment, the positive plate, the aluminum-plastic film, the electrolyte and the leakage current channel of the soft package lithium ion battery can form a protection primary battery. The anode plate has the highest potential and serves as the anode for protecting the primary battery, and the aluminum-plastic film serves as the cathode for protecting the primary battery, so that the lithium-embedded corrosion phenomenon of the aluminum-plastic film can be avoided.
In one embodiment, the size of W1 and W2 can be controlled to achieve L of 0.1-50 μm. Specifically, one end of the positive electrode tab opening in the positive electrode tab expansion part is a first end, and the minimum distance between the first end and one end of the positive electrode tab expansion part close to the first end is W1; the end of the positive pole lug opening positioned in the non-expansion part is a second end, and the minimum distance between the second end and the end of the positive pole lug expansion part close to the second end is W2; wherein W1+ W2 is 1.5-4 mm. When the sum of W1 and W2 meets the range, the minimum distance between the positive electrode tab and the aluminum layer in the aluminum-plastic film is 0.1-50 mu M, so that the insulation resistance between the positive electrode tab and the aluminum-plastic film is 0.5-50M omega, and the lithium-insertion corrosion phenomenon of the aluminum-plastic film can be effectively inhibited.
Further, when the minimum distance L between the positive electrode tab 103 and the aluminum layer 106 in the aluminum-plastic film is 15-40 μ M, the insulation resistance between the positive electrode tab and the aluminum-plastic film is 10-20 MOmega at this time, and the insulation resistance can effectively inhibit potential lithium intercalation corrosion of the aluminum-plastic film.
Furthermore, the minimum distance L between the positive electrode tab 103 and the aluminum layer 106 in the aluminum plastic film is 15-40 μm, which can be realized by controlling W1+ W2 to be 2.5-3.5 mm.
In a specific embodiment, the insulation resistance between the negative electrode tab and the aluminum plastic film is more than 200M omega. When the insulation resistance between the cathode tab and the aluminum-plastic film is greater than 200M omega, the aluminum-plastic film can not be corroded by lithium insertion.
Further, the insulation resistance between the negative electrode tab and the aluminum-plastic film is greater than 200M Ω by controlling the minimum distance L between the negative electrode tab 104 and the aluminum layer 106 in the aluminum-plastic film to be 140-160 μ M.
As shown in fig. 1, the soft-package lithium ion battery of the present invention may have a structure with one tab, that is, the positive tab 103 and the negative tab 104 are both located at the top sealing end of the package body.
When the soft package lithium ion battery is in a structure with one end provided with a tab, the top sealing end of the packaging body further comprises a negative tab expansion part, and the thickness of the negative tab expansion part is larger than that of the non-expansion part. The top sealing end also comprises a negative pole lug opening, and in the extending direction of the top sealing end, two ends of the negative pole lug opening are positioned in the negative pole lug extension part. In the extending direction perpendicular to the top end cap of the packaging body, the other end of the opening of the negative pole tab 104 extends out through the opening of the negative pole tab.
When the top seal end of the package body simultaneously comprises the positive electrode tab 103 and the negative electrode tab 104, the non-extension part comprises three parts: the first part is positioned between the positive electrode lug expansion part and the negative electrode lug expansion part and plays a role in connecting the positive electrode lug expansion part and the negative electrode lug expansion part; the second part is far away from the negative pole lug expansion part and is connected with one end of the positive pole lug expansion part; the third part is far away from the anode tab extension part and is connected with one end of the cathode tab extension part.
The other end of the positive electrode tab opening defined by the present invention is located in the non-expansion portion, which can be realized by the following two embodiments. In one embodiment, as shown in fig. 2, the other end of the positive electrode tab opening is located at the non-extended part between the extended part of the positive electrode tab and the extended part of the negative electrode tab; fig. 3 is a schematic cross-sectional view of a top sealing end of a package according to another embodiment of the present invention, as shown in fig. 3, in another embodiment, the other end of the positive electrode tab opening is located at a non-extended portion outside the extended portions of the positive electrode tab and the negative electrode tab and close to the extended portions of the positive electrode tab.
Fig. 4 is a schematic structural diagram of a soft package lithium ion battery according to another embodiment of the present invention. As shown in fig. 4, the soft-package lithium ion battery of the present invention may also have a structure with two ends for outputting tabs, and in the structure with two ends for outputting tabs, the package body further includes a bottom end cap disposed opposite to the top end cap, wherein the positive electrode tab 103 is located at the top end cap of the package body, and the negative electrode tab 104 is located at the bottom end cap of the package body.
When the soft package lithium ion battery is in a structure with lugs at two ends, the bottom sealing end of the packaging body comprises a negative pole lug expansion part and a non-expansion part, and the thickness of the negative pole lug expansion part is larger than that of the non-expansion part. Similarly, the bottom sealing end further comprises a negative pole lug opening, and two ends of the negative pole lug opening are located in the negative pole lug expansion part in the extension direction of the bottom sealing end. In the extending direction vertical to the bottom sealing end, the other end of the negative pole tab extends out through the opening of the negative pole tab.
In a second aspect, the invention provides an electronic device comprising the soft package lithium ion battery provided in the first aspect of the invention. The electronic device of the present invention is not limited in kind, and may specifically include, but not limited to, a mobile phone, a desktop computer, a notebook computer, a power automobile, an electric bicycle, a digital camera, an intelligent appliance, and the like.
The soft package lithium ion battery provided by the invention is further described in detail by specific examples.
Examples
The embodiment includes 30 soft-package lithium ion battery samples, all of which are in a one-end tab-out structure as shown in fig. 1.
As shown in fig. 1, the soft package lithium ion battery of this embodiment includes an aluminum plastic film 101 and a battery cell, the battery cell includes a battery cell body 102, a positive electrode tab 103 and a negative electrode tab 104, the battery cell body 102 is sealed in a battery cell body accommodating area of the package body, and in an extending direction perpendicular to the top sealing end, one end of the positive electrode tab 103 and one end of the negative electrode tab 104 are connected to the battery cell body 102.
The top seal end of the package of the present embodiment has a cross-sectional structure consistent with that shown in fig. 2, as shown in fig. 2, the top seal end of the package includes an extended portion of a positive electrode tab, an extended portion of a negative electrode tab, and a non-extended portion, and the extended portion of the positive electrode tab includes an opening of the positive electrode tab. In the extending direction of the top sealing end, one end of the positive electrode tab opening is positioned in the positive electrode tab extending part, and the other end of the positive electrode tab opening is positioned in the non-extending part between the positive electrode tab extending part and the negative electrode tab extending part; the negative pole tab openings are all located in the negative pole tab extension portion.
The minimum distance between one end of the positive electrode tab opening in the positive electrode tab extended part and one end of the positive electrode tab extended part close to the positive electrode tab opening is W1, and the minimum distance between one end of the positive electrode tab opening in the non-extended part and one end of the positive electrode tab extended part close to the positive electrode tab opening is W2, wherein W1+ W2 is 3.0 +/-0.5 mm.
The minimum distance between one end of the negative pole tab opening and one end of the negative pole tab expansion part close to the negative pole tab opening is W3, the minimum distance between the other end of the negative pole tab opening in the extending direction of the top sealing end and one end of the negative pole tab expansion part close to the negative pole tab opening is W4, | W3-W4| <0.5 mm.
The aluminum plastic film in this embodiment is DNP153, and the aluminum plastic film includes a first sealing layer 105, an aluminum layer 106, and a second sealing layer 107. Wherein the material of the first sealing layer 105 is a PA/PET compound, and the single-layer thickness is 30 μm; the aluminum layer 106 is made of metal aluminum, and the thickness of a single layer is 40 μm; the first sealing layer 105 and the aluminum layer 106 are bonded through an adhesive, and the thickness of the adhesive is 3 micrometers; the material of the second sealing layer 107 is PP, the single-layer thickness is 80um, the total thickness of the second sealing layer 107 in the non-expanded portion is equal and 250 μm, and the total thickness of the second sealing layer 107 in the positive electrode tab expanded portion and the negative electrode tab expanded portion is equal and 590 μm.
The positive electrode tab 103 is made of metal aluminum and has a thickness of 200 μm; the negative electrode tab 104 is a copper nickel-plated tab with a thickness of 200 μm.
The minimum distance L between the positive electrode tab 103 and the aluminum plastic film aluminum layer 106 is 15-40 μm, and the minimum distance L between the negative electrode tab 104 and the aluminum plastic film aluminum layer 106 is 140-160 μm.
And testing the insulation impedance between the positive electrode lug and the aluminum-plastic film to be 10-20M omega by using an insulation resistance tester, and testing the insulation impedance between the negative electrode lug and the aluminum-plastic film to be more than 1G omega.
The corresponding relationship between the minimum distance L between the positive electrode tab and the aluminum layer of the aluminum-plastic film and the insulation resistance R between the positive electrode tab and the aluminum-plastic film of the 30 soft package lithium ion battery samples in this embodiment is shown in table 1.
TABLE 1
| Battery with a battery cell | Sample 1 | Sample 2 | Sample 3 | |
Sample 5 | Sample 6 | Sample 7 | Sample 8 | Sample 9 | Sample 10 |
| L(μm) | 34.7 | 23.4 | 21.8 | 21.9 | 21.9 | 23.0 | 35.1 | 35.4 | 28.5 | 26.2 |
| R(MΩ) | 17.3 | 13.5 | 12.4 | 13.1 | 13.0 | 13.2 | 18.1 | 18.2 | 15.8 | 14.1 |
| Battery with a battery cell | Sample 11 | Sample 12 | Sample 13 | Sample 14 | |
Sample 16 | Sample 17 | Sample 18 | Sample 19 | Sample 20 |
| L(μm) | 20.8 | 28.9 | 28.1 | 28.2 | 33.3 | 26.5 | 26.8 | 24.0 | 16.0 | 28.8 |
| R(MΩ) | 12.1 | 16.0 | 15.1 | 15.3 | 17.3 | 14.6 | 14.8 | 12.4 | 10.3 | 15.4 |
| Battery with a battery cell | Sample 21 | Sample 22 | Sample 23 | Sample 24 | |
Sample 26 | Sample 27 | Sample 28 | Sample 29 | Sample 30 |
| L(μm) | 37.1 | 24.4 | 30.0 | 26.6 | 29.7 | 25.2 | 23.0 | 18.3 | 27.8 | 22.6 |
| R(MΩ) | 19.1 | 13.4 | 15.9 | 14.5 | 16.1 | 14.0 | 13.2 | 11.1 | 15.1 | 12.8 |
Comparative example
The comparative example includes 30 soft-packed lithium ion battery samples, all of which are in a one-end tab-out structure as shown in fig. 1.
As shown in fig. 1, the soft package lithium ion battery of this comparative example includes an aluminum plastic film 101 and a battery cell, the battery cell includes a battery cell body 102, a positive electrode tab 103 and a negative electrode tab 104, the battery cell body 102 is sealed in a battery cell body accommodating area of the package body, and in an extending direction perpendicular to the top sealing end, one end of the positive electrode tab 103 and one end of the negative electrode tab 104 are connected to the battery cell body 102.
Fig. 5 is a schematic cross-sectional view of the top sealing end of the package according to the comparative example of the present invention, as shown in fig. 5, the top sealing end of the package includes an extended portion of a positive tab, an extended portion of a negative tab, and a non-extended portion, the extended portion of the positive tab includes an opening of the positive tab, and the extended portion of the negative tab includes an opening of the negative tab. In the extending direction of the top sealing end, both ends of the positive electrode lug opening are positioned in the positive electrode lug extending part, and both ends of the negative electrode lug opening are positioned in the negative electrode lug extending part.
The minimum distance between one end of the positive pole lug opening and one end of the positive pole lug expansion part close to the positive pole lug opening is W1, the minimum distance between the other end of the positive pole lug opening and one end of the positive pole lug expansion part close to the positive pole lug opening is W2, and the minimum distance is W1-W2| <0.5 mm.
The minimum distance between one end of the negative pole tab opening and one end of the negative pole tab expansion part close to the negative pole tab opening is W3, the minimum distance between the other end of the negative pole tab opening and one end of the negative pole tab expansion part close to the negative pole tab opening is W4, | W3-W4| <0.5 mm.
The aluminum plastic film includes a first sealant 105, an aluminum layer 106, and a second sealant 107. Wherein the material of the first sealing layer 105 is a PA/PET compound, and the single-layer thickness is 30 μm; the aluminum layer 106 is made of metal aluminum, and the thickness of a single layer is 40 μm; the material of the second sealing layer 107 is PP, the total thickness of the second sealing layer 107 in the non-expanded portion is equal to 250 μm, and the total thickness of the second sealing layer 107 in the positive electrode tab expanded portion and the negative electrode tab expanded portion is equal to 590 μm.
The positive electrode tab 103 is made of metal aluminum and has a thickness of 200 μm; the negative electrode tab 104 is made of a copper nickel-plated tab and has a thickness of 200 μm.
The minimum distance L between the positive electrode tab 103 and the aluminum plastic film aluminum layer 106 is 140-160 μm, and the minimum distance L between the negative electrode tab 104 and the aluminum plastic film aluminum layer 106 is also 140-160 μm.
And testing the insulation impedance between the positive plate and the aluminum-plastic film to be more than 1G omega by using an insulation resistance tester, and testing the insulation impedance between the negative plate and the aluminum-plastic film to be more than 1G omega.
Test examples
Corrosion resistance test of soft package lithium ion battery
The test method comprises the following steps: a 10M omega resistor is connected between the negative electrode plate and the aluminum plastic film of the soft package lithium ion battery samples of the examples and the comparative examples in parallel, and the time of corrosion of the soft package lithium ion battery samples of the examples and the comparative examples is recorded.
The corrosion was judged by: and detecting the potential between the aluminum plastic film and the positive plate, and if the insulation voltage is increased, indicating that the soft package lithium ion battery sample begins to corrode.
The recorded results are shown in fig. 6 and 7, the theoretical etching time in fig. 6 and 7 represents the theoretical etching time calculated from the thickness of the aluminum plastic film, the radius of the pitting hole and the etching current, and the amount of electricity q required for etching a certain amount of aluminum can be calculated by equation 1:
therefore, the theoretical time t of corrosion can be calculated by equation 2:
in the formula 1 and the formula 2, t is theoretical corrosion time, q is the electric quantity required by certain amount of aluminum corrosion, R is pitting radius, L is the thickness of the aluminum-plastic film, rho is the density of aluminum, F is a Faraday constant, R is insulation resistance, M is the molar mass of aluminum, and V is corrosion potential.
Fig. 6 is a graph comparing the time at which corrosion occurred for 30 soft pack lithium ion battery samples of the examples. The corrosion time record of fig. 6 adopts a right deletion mode, where right deletion means that each sample only adopts a small triangle to record time, and an abscissa corresponding to a position of a vertex of the small triangle far from the y axis represents the experiment cut-off time, which indicates that lithium intercalation corrosion still does not occur in the aluminum plastic film at the experiment cut-off time. As shown in fig. 6, no lithium intercalation corrosion occurred in any of the 30 soft-pack lithium ion batteries according to the example of the present invention within 60 days.
Fig. 7 is a graph comparing the time at which corrosion occurred in 30 soft-packed lithium ion battery samples of comparative example. The corrosion time record of fig. 7 adopts a section deletion mode, wherein the section deletion means that each sample adopts two small triangles to record the corrosion time, and the section formed by the abscissa corresponding to the position of the two small triangles indicates that the lithium intercalation corrosion phenomenon occurs in the aluminum plastic film within the range of the section. As shown in fig. 7, the lithium intercalation corrosion occurred in all of the 30 soft pack lithium ion batteries of the comparative example within 20 days, and the shortest corrosion occurred in about 5 days and the longest corrosion occurred in about 20 days in the battery sample of the comparative example.
As can be seen from the comparison between fig. 6 and fig. 7, the soft-package lithium ion battery of the present invention can effectively inhibit the occurrence of the lithium intercalation corrosion phenomenon of the aluminum plastic film.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A soft package lithium ion battery is characterized by comprising an aluminum plastic film and a battery cell, wherein the battery cell comprises a battery cell body, a positive electrode lug and a negative electrode lug, and one end of the positive electrode lug and one end of the negative electrode lug are respectively connected with the battery cell body;
the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by the aluminum plastic film, the top sealing end of the packaging body comprises a positive electrode lug expansion part and a non-expansion part, and the thickness of the positive electrode lug expansion part is greater than that of the non-expansion part;
the top sealing end comprises a positive pole lug opening, one end of the positive pole lug opening is positioned in the positive pole lug expansion part, the other end of the positive pole lug opening is positioned in the non-expansion part, and the other end of the positive pole lug extends out of the positive pole lug opening;
the minimum distance between the positive electrode lug and the aluminum layer in the aluminum-plastic film is L, and L is 0.1-50 mu m;
the insulation impedance between the negative electrode tab and the aluminum-plastic film is greater than that between the positive electrode tab and the aluminum-plastic film.
2. The soft pack lithium ion battery of claim 1,
the minimum distance between the first end and one end of the positive electrode lug expansion part close to the first end is W1;
the end of the positive pole lug opening positioned in the non-expansion part is a second end, and the minimum distance between the second end and the end of the positive pole lug expansion part close to the second end is W2;
wherein W1+ W2 is 1.5-4 mm.
3. The soft-package lithium ion battery according to claim 1 or 2, wherein L is 15-40 μm.
4. The soft package lithium ion battery according to claim 2 or 3, wherein W1+ W2 is 2.5-3.5 mm.
5. The soft-package lithium ion battery according to any one of claims 1 to 4, wherein the insulation resistance between the negative electrode tab and the aluminum plastic film is greater than 200M Ω.
6. The soft package lithium ion battery as claimed in any one of claims 1 to 5, wherein the minimum distance L between the negative electrode tab and the aluminum layer in the aluminum plastic film is 140-160 μm.
7. The soft-package lithium ion battery according to any one of claims 1 to 6, wherein the top sealed end of the package body further comprises a negative electrode tab extension part, and the thickness of the negative electrode tab extension part is greater than that of the non-extension part;
the top seal end comprises a negative pole lug opening, the negative pole lug opening is located in the negative pole lug expansion portion, and the other end of the negative pole lug extends out of the negative pole lug opening.
8. The soft-packed lithium ion battery of claim 7, wherein the other end of the positive electrode tab opening is located in a non-expanded portion between the positive electrode tab expanded portion and the negative electrode tab expanded portion;
or the other end of the positive electrode tab opening is positioned outside the positive electrode tab expansion part and the negative electrode tab expansion part and is close to the non-expansion part of the positive electrode tab expansion part.
9. The soft-package lithium ion battery according to any one of claims 1 to 6, wherein the package body further comprises a bottom end cap, the bottom end cap comprises a negative electrode tab expansion part and a non-expansion part, and the thickness of the negative electrode tab expansion part is greater than that of the non-expansion part;
the bottom sealing end comprises a negative pole lug opening, the negative pole lug opening is located in the negative pole lug expansion portion, and the other end of the negative pole lug extends out of the negative pole lug opening.
10. An electronic device comprising the soft-packed lithium ion battery according to any one of claims 1 to 9.
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