CN113851792A - Soft package lithium ion battery and electronic device - Google Patents
Soft package lithium ion battery and electronic device Download PDFInfo
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- CN113851792A CN113851792A CN202111239066.2A CN202111239066A CN113851792A CN 113851792 A CN113851792 A CN 113851792A CN 202111239066 A CN202111239066 A CN 202111239066A CN 113851792 A CN113851792 A CN 113851792A
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- electrode tab
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- positive electrode
- plastic film
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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
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
- H01M50/145—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against corrosion
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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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
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- 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
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, one end of the positive electrode tab and one end of the negative electrode tab are respectively connected with the battery cell body, and the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by the aluminum plastic film; 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 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 electric core to accelerate the gas generation of the electric core, and the internal electrolyte can permeate out to further cause bulging and liquid leakage.
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 tab of the lithium ion battery and an aluminum-plastic film by controlling the minimum distance between the positive electrode tab and an aluminum-plastic film aluminum layer, and simultaneously control the insulation impedance between a negative electrode tab and the aluminum-plastic film to be larger than the insulation impedance between the positive electrode tab and the aluminum-plastic film, so that a protective primary battery is formed by the positive electrode tab 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, one end of the positive electrode lug and one end of the negative electrode lug are respectively connected with the battery cell body, and the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by the aluminum plastic film; 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 comprises a package body, a soft package lithium ion battery body and a soft package lithium ion battery, wherein the top sealing end of the package body comprises a positive electrode tab expansion part and a non-expansion part, and the thickness of the positive electrode tab expansion part is greater than that of the non-expansion part;
the top sealing end comprises a positive pole lug opening, the positive pole lug opening is located in the positive pole lug expansion portion, and the other end of the positive pole lug extends out through the positive pole lug opening.
The soft package lithium ion battery is characterized in that one end of the positive electrode tab opening in the positive electrode tab expansion part is a first end, and the other end of the positive electrode tab opening in the positive electrode tab expansion part is a second end;
the minimum distance between the first end and the end of the positive electrode lug expansion part close to the first end is W1, the minimum distance between the second end and the end of the positive electrode lug expansion part close to the second end is W2, and the | W1-W2|, is 0-0.5 mm.
The soft package lithium ion battery is characterized in that L is 20-40 μm.
The soft package lithium ion battery is characterized in that the insulation resistance between the negative electrode sheet and the aluminum plastic film is greater than 200M Ω.
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 sealing end comprises a negative pole lug opening, the negative pole lug opening is positioned in the negative pole lug expansion part, and the other end of the negative pole lug extends out of the negative pole lug opening; or the like, or, alternatively,
the packaging body further comprises a bottom end cap, the bottom end cap further 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;
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 soft package lithium ion battery is characterized in that the thickness of the negative electrode tab extension part is larger than that of the positive electrode tab extension part.
The soft package lithium ion battery is characterized in that the thickness of the positive electrode tab extension part is 380-420 μm; and/or the presence of a gas in the gas,
the thickness of the extended part of the negative pole tab is 620-660 μm.
The invention also provides an electronic device which comprises the soft package lithium ion battery.
According to the soft package lithium ion battery, 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, and the insulation impedance between the negative electrode tab and the aluminum-plastic film is controlled to be larger than that between the positive electrode tab and the aluminum-plastic film, so that the soft package lithium ion battery can form a protective primary battery, the aluminum layer in the aluminum-plastic film serves as the negative electrode for protecting the primary battery, and the positive electrode plate serves as the positive electrode for protecting the primary battery, so that the lithium intercalation corrosion phenomenon 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 schematic structural diagram of a soft package lithium ion battery according to another embodiment of the present invention;
FIG. 4 is a cross-sectional view of the top-sealing end of the package according to the comparative example;
FIG. 5 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. 6 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, one end of the positive electrode lug and one end of the negative electrode lug are respectively connected with the battery cell body, and the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by the aluminum-plastic film;
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 during packaging, the second sealing layers of the two layers of aluminum-plastic films are stacked oppositely, and then 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.
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 layer of the aluminum-plastic film.
The inventor researches and discovers that a leakage current channel can be formed between a positive plate and an aluminum-plastic film by controlling the minimum distance between the positive plate lug and an aluminum layer in the aluminum-plastic film to be 0.1-50 mu M, the insulation impedance between the positive plate lug and the aluminum-plastic film to be 0.5-50M omega, and the insulation impedance between a negative plate lug and the aluminum-plastic film to be larger than that between the positive plate lug and the aluminum-plastic film, and at the same time, the positive plate, the aluminum-plastic film, an electrolyte and a leakage current channel of a soft package lithium ion battery can form a protective original 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.
Furthermore, the top sealing end of the packaging body comprises a positive electrode tab expansion part and a non-expansion part, and the thickness of the positive electrode tab expansion part is greater than that of the non-expansion part; the top sealing end comprises a positive pole lug opening, the positive pole lug opening is positioned in the positive pole lug extension part, and the other end of the positive pole lug extends out through the positive pole lug opening.
Specifically, one end of the positive electrode tab 103 is connected to the battery cell body, and the other end of the positive electrode tab 103 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, it is outside to make other end utmost point ear be located the plastic-aluminum membrane, then encapsulate, anodal utmost point ear is before not encapsulating, the surface has all wrapped up one deck utmost point ear and has glued, the material that utmost point ear was glued can be unanimous with the material of plastic-aluminum membrane second sealing layer, when the encapsulation, thereby utmost point ear glue on the anodal utmost point ear and the second sealing layer hot melt in the plastic-aluminum membrane form a whole completion encapsulation, the sealed structure all around of the packaging body has both been guaranteed like this, 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 having a dimension in the direction of extension of the top end of the package (i.e., the direction of the length of the top end) that substantially matches the dimension of the positive tab 103 in that direction. In the extending direction of the top sealing end of the packaging body, two ends of the positive electrode lug opening are both positioned in the positive electrode lug extension 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. In one specific embodiment, the positive tab opening is located at a center of the positive tab extension.
Specifically, in the extending direction of the top sealing end, two ends of an opening of the positive electrode tab are a first end and a second end respectively; the minimum distance between the first end and the end of the positive electrode lug expansion part close to the first end is W1, the minimum distance between the second end and the end of the positive electrode lug expansion part close to the second end is W2, and the | W1-W2|, is 0-0.5 mm. When the absolute value of the difference between W1 and W2 satisfies the above range, the positive electrode tab extended portion can be ensured to be located at the center of the positive electrode tab extended portion.
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.
In a specific embodiment, the insulation resistance between the negative electrode sheet and the aluminum plastic film is greater than 200M Ω. When the insulation resistance between the negative plate and the aluminum-plastic film is larger than 200M omega, the aluminum-plastic film can not generate the condition of lithium intercalation corrosion.
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.
Fig. 3 is a schematic structural diagram of a soft package lithium ion battery according to another embodiment of the present invention. As shown in fig. 3, 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 specific embodiment, the thickness of the negative electrode tab extension may be made greater than the thickness of the positive electrode tab extension. Generally, when an electrical core is packaged by using an aluminum-plastic film, the thickness of an aluminum layer in the aluminum-plastic film and the thickness of a first sealing layer need to be kept consistent between a positive electrode lug extension part and a negative electrode lug extension part, and the thickness of a positive electrode lug is greater than or equal to that of a negative electrode lug, so that the thickness of the positive electrode lug extension part is greater than or equal to that of the negative electrode lug extension part, and therefore, when the thickness of the negative electrode lug extension part is controlled to be greater than that of the positive electrode lug extension part, the minimum distance between the negative electrode lug and the aluminum layer of the aluminum-plastic film can be greater than the minimum distance between the positive electrode lug and the aluminum layer of the aluminum-plastic film, so that the insulation impedance between the negative electrode lug and the aluminum-plastic film is greater than that between the positive electrode lug and the aluminum-plastic film.
Specifically, the thickness of the extended part of the positive electrode tab can be 380-420 μm; and/or the thickness of the extended part of the negative pole tab is 620-660 mu m.
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.
The thickness of the extended part of the positive electrode tab is 380-420 μm, and the thickness of the extended part of the negative electrode tab is 620-660 μm.
In the extending direction of the top sealing end, the positive pole tab opening is positioned in the positive pole tab extension part, and the negative pole tab opening is positioned in the negative pole tab extension part.
In the extending direction of the top sealing end, one end of the positive electrode tab opening is a first end, and the other end is a second end; the minimum distance between the first end and the end of the positive electrode lug expansion part close to the first end is W1, and the minimum distance between the second end and the end of the positive electrode lug expansion part close to the second end is W2, wherein | W1-W2| <0.5 mm.
Similarly, in the extending direction of the top sealing end, one end of the negative electrode tab opening is a third end, and the other end is a fourth end; the minimum distance between the third end and one end of the negative pole lug expansion part close to the third end is W3, and the minimum distance between the third end and the negative pole lug expansion part close to the third end is W4, wherein | 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, and the total thickness of the second sealing layer 107 in the non-expanded portion is equal and 110 μm.
The positive electrode tab 103 is made of metal aluminum and has a thickness of 200 μm; the material of the negative electrode tab 104 is a copper nickel-plated tab with the thickness of 200 μm.
The minimum distance L between the positive electrode tab 103 and the aluminum plastic film aluminum layer 106 is 20-40 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 6 | Sample 7 | Sample 8 | |
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. 4 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. 4, 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.
The thickness of the extended part of the positive electrode tab is 620 to 660 μm, and the thickness of the extended part of the negative electrode tab is 620 to 660 μm.
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.
In the extending direction of the top sealing end, one end of the positive electrode tab opening is a first end, and the other end is a second end; the minimum distance between the first end and the end of the positive electrode lug expansion part close to the first end is W1, the minimum distance between the second end and the end of the positive electrode lug expansion part close to the second end is W2, wherein | W1-W2| <0.5mm
Similarly, in the extending direction of the top sealing end, one end of the negative electrode tab opening is a third end, and the other end is a fourth end; the minimum distance between the third end and one end of the negative pole lug expansion part close to the third end is W3, and the minimum distance between the third end and the negative pole lug expansion part close to the third end is W4, wherein 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. 5 and 6, the theoretical etching time in fig. 5 and 6 represents the theoretical etching time calculated according to the thickness of the aluminum plastic film, the radius of the pitting hole and the etching current, and the electric quantity q required for etching a certain amount of aluminum can be calculated by the following formula 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. 5 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. 5 adopts a right deletion mode, where right deletion means that each sample only adopts a small triangle to record time, and the abscissa corresponding to the position of the 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. 5, no lithium intercalation corrosion occurred in any of the 30 soft-pack lithium ion batteries of the example of the present invention within 60 days.
Fig. 6 is a graph comparing the time at which corrosion occurred for 30 soft-packed lithium ion battery samples of comparative example. The corrosion time record of fig. 6 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. 6, 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. 5 and fig. 6, 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 tab and a negative electrode tab, one end of the positive electrode tab and one end of the negative electrode tab are respectively connected with the battery cell body, and the battery cell body is sealed in a battery cell body accommodating area of a packaging body formed by the aluminum plastic film; 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-package lithium ion battery according to claim 1, wherein the top sealing end of the package body comprises a positive electrode tab extension part and a non-extension part, and the thickness of the positive electrode tab extension part is greater than that of the non-extension part;
the top sealing end comprises a positive pole lug opening, the positive pole lug opening is located in the positive pole lug expansion portion, and the other end of the positive pole lug extends out through the positive pole lug opening.
3. The soft-package lithium ion battery according to claim 2, wherein one end of the positive electrode tab opening in the positive electrode tab extension part is a first end, and the other end of the positive electrode tab opening in the positive electrode tab extension part is a second end;
the minimum distance between the first end and the end of the positive electrode lug expansion part close to the first end is W1, the minimum distance between the second end and the end of the positive electrode lug expansion part close to the second end is W2, and the | W1-W2|, is 0-0.5 mm.
4. The soft pack lithium ion battery according to any one of claims 1 to 3, wherein L is 20 to 40 μm.
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 2 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 sealing end comprises a negative pole lug opening, the negative pole lug opening is positioned in the negative pole lug expansion part, and the other end of the negative pole lug extends out of the negative pole lug opening; or the like, or, alternatively,
the packaging body further comprises a bottom sealing end, the bottom sealing end 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;
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.
8. The soft pack lithium ion battery of claim 7, wherein the negative electrode tab extension has a thickness greater than the thickness of the positive electrode tab extension.
9. The soft package lithium ion battery according to claim 7 or 8, wherein the thickness of the extended part of the positive electrode tab is 380-420 μm; and/or the presence of a gas in the gas,
the thickness of the extended part of the negative pole tab is 620-660 μm.
10. An electronic device comprising the soft-packed lithium ion battery according to any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117458054A (en) * | 2023-12-25 | 2024-01-26 | 中航锂电（洛阳）有限公司 | Partial pressure structure, battery monomer, battery and power consumption device |
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