CN105390627A - Electrochemical cell and preparation method thereof - Google Patents
Electrochemical cell and preparation method thereof Download PDFInfo
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- CN105390627A CN105390627A CN201510675282.XA CN201510675282A CN105390627A CN 105390627 A CN105390627 A CN 105390627A CN 201510675282 A CN201510675282 A CN 201510675282A CN 105390627 A CN105390627 A CN 105390627A
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- cell
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the field of electrochemical cells, and particularly relates to an electrochemical cell which comprises a bare cell, electrolyte and an outer package, wherein an adhesive tape layer is arranged between the bare cell and the outer package, the adhesive tape layer comprises a base material and an adhesive layer, the thickness h1 of the base material is 0.5-500 mu m, and the base material shows adhesive property when heated to above 45 ℃; the thickness h2 of the adhesive layer is 0.5-500 μm, and the adhesive layer exhibits adhesive properties at a temperature of 45 ℃ or less; the adhesive tape (before the adhesive is not overflowed) covers 2-90% of the surface area of the naked electric core. The invention has the advantages that the bonding layer has bonding force at lower temperature, is convenient to operate when preparing the battery cell and is adhered to the surface of a naked battery cell or/and the inner side of an outer package; and through heating back substrate demonstrate the adhesion promptly, can the bonding area between naked electric core of effectual increase and the extranal packing, the area of naked electric core is covered to less sticky tape to practice thrift gluey quantity, reduce excessive gluey total amount, prevent that the viscose layer from diffusing to degasification encapsulation limit influence packaging effect.
Description
Technical Field
The invention belongs to the field of electrochemical cells, and particularly relates to an electrochemical cell and a preparation method thereof.
Background
After the 21 st century, various electronic device products such as mobile phones, notebooks, wearable devices and the like are in endless, and the lives of the users are greatly enriched; meanwhile, electric vehicles and various energy storage power stations can sprout, develop and grow rapidly like spring bamboo shoots in the rainy season. The above high-tech products have one common feature: high performance batteries are required to serve as energy storage components.
The existing batteries mainly comprise a primary battery and a secondary battery; the so-called primary battery, which is a battery that cannot be repeatedly charged, mainly includes a carbon zinc battery, an alkaline battery, a paste zinc-manganese battery, a cardboard zinc-manganese battery, an alkaline zinc-manganese battery, a button battery (a zinc-silver button battery, a lithium-manganese button battery, a zinc-manganese button battery), a zinc-air battery, a primary lithium-manganese button battery, and the like, and a mercury battery; the secondary battery, i.e., a rechargeable battery, mainly includes a secondary alkaline zinc-manganese battery, a nickel-cadmium rechargeable battery, a nickel-hydrogen rechargeable battery, a lithium rechargeable battery, a lead-acid battery, and a solar battery. Lead-acid batteries can be divided into: open type lead-acid storage battery and totally-enclosed lead-acid storage battery. From the perspective of external packaging, the conventional batteries are mainly classified into flexible-packaged batteries and hard-shell-packaged batteries, and the flexible-packaged battery packaging film has small thickness and large plasticity, so that the battery is widely applied to various high-grade primary batteries and secondary batteries.
However, with the continuous upgrade of various electric devices, the battery has more requirements on the performance of the battery, such as higher energy density, faster charging and discharging speed, longer cycle life, better safety performance, etc., and the safety performance of the battery cell is closely related to the safe use of the electric product and the life and property of the user, and is concerned by battery manufacturers and users. Such as the drop resistance of the battery, the standby users put forward higher and higher requirements, and establish corresponding detection standards, such as drop tests, roller tests and the like.
In order to solve the above problems, the utility model patent with patent application number 201420044841.8 invented an effective method: the winding type battery cell is formed by sequentially winding a positive pole piece, an isolation film and a negative pole piece, wherein the width of the isolation film is greater than the widths of the positive pole piece and the negative pole piece; an electrolyte; the packaging film is used for packaging the winding type battery cell and accommodating electrolyte; the winding end of the winding type battery cell is adhered with a single-sided adhesive layer, the adhesive of the single-sided adhesive layer is flowable curing adhesive, and the winding type battery cell and the packaging film flow out of the curing adhesive around the single-sided adhesive layer through flowing and are adhered together. The single-sided adhesive layer is pasted, so that the winding type battery cell can be prevented from being scattered or deformed after winding is finished and before the winding type battery cell is placed into the packaging film, and the winding type battery cell can be conveniently placed into the packaging film. However, because the method adopts the flowable adhesive, the adhesive can easily flow to the degassing packaging edge in the actual production process, thereby causing packaging failure.
In view of the above, there is a need to develop a new battery, which can solve the problem of dropping resistance of the battery and does not affect the packaging reliability of the degassing side of the battery.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the provided electrochemical battery comprises a naked battery cell, electrolyte and an outer package, and is characterized in that an adhesive tape layer is arranged between the naked battery cell and the outer package, the adhesive tape layer comprises a base material and an adhesive layer, the adhesive layer is attached to one surface of the base material, the thickness h1 of the base material is 0.5-500 mu m, and the base material shows adhesive property when heated to above 45 ℃; the thickness h2 of the adhesive layer is 0.5-500 μm, and the adhesive layer exhibits adhesive properties at a temperature of 45 ℃ or less; the adhesive tape (before the adhesive is not overflowed) covers 2-90% of the surface area of the naked electric core. The invention has the advantages that the bonding layer has bonding force at lower temperature, is convenient to operate when preparing the battery cell and is adhered to the surface of a naked battery cell or/and the inner side of an outer package; and the substrate shows the adhesion promptly through heating back, can the bonding area between naked electric core of effectual increase and the extranal packing, the area of less sticky tape cover naked electric core to practice thrift gluey quantity, reduce the excessive total volume of gluing, prevent that the viscose layer from diffusing to degasification encapsulation limit influence packaging effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electrochemical cell comprises a naked electric core, electrolyte and an outer package, wherein an adhesive tape layer is arranged between the naked electric core and the outer package, the adhesive tape layer comprises a base material and an adhesive layer, the adhesive layer is attached to one surface of the base material, the thickness h1 of the base material is 0.5-500 mu m, and the base material shows adhesive property when heated to above 45 ℃; the thickness h2 of the adhesive layer is 0.5-500 μm, and the adhesive layer exhibits adhesive properties at a temperature of 45 ℃ or less; the adhesive tape (before the adhesive is not overflowed) covers 2-90% of the surface area of the naked electric core. The bonding layer has bonding force at a lower temperature (less than or equal to 45 ℃), is convenient to operate when the battery core is prepared (usually operated at room temperature), and is adhered to the surface of a naked battery core or/and the inner side of an outer package; and through the bonding force that shows promptly of substrate after the heating (be more than or equal to 45 ℃), can effectual increase the bonding area between naked electric core and the extranal packing, reduce the area that the sticky tape covered naked electric core to practice thrift gluey quantity, reduce the excessive total volume of gluing, prevent that the viscose layer from diffusing to degasification encapsulation limit and influencing the encapsulation effect.
As an improvement of the electrochemical cell, the base material is at least one selected from reactive hot melt adhesives, polyethylene, modified polyethylene, polypropylene and modified polypropylene, and the thickness h1 is 3-100 μm; the substrate exhibits adhesive properties when heated to 60 ℃ or higher.
As an improvement of an electrochemical cell of the present invention, the substrate has no adhesive properties at a temperature of 60 ℃ or less.
As an improvement of the electrochemical cell, the bonding layer is at least one of organic silicon pressure-sensitive adhesive, polyvinylidene fluoride, styrene-butadiene rubber, polyurethane and polyacrylate, and the thickness h2 is 3-100 mu m.
As an improvement of an electrochemical cell of the present invention, the tape is a porous structure tape, the area of the porous region is S1, and the area of the non-porous region is S2.
As an improvement of an electrochemical cell of the present invention, (S2 × h 1)/(S1 × h 2) ≦ 2 (since a substrate that is sticky after heating, tends to have fluidity when exhibiting stickiness, and when (S2 × h 1)/(S1 × h 2) ≦ 2, the volume reserved for the pore structure is able to store the flowing substrate, preventing uncontrolled flow of the substrate, affecting cell performance, such as package reliability); the sizes of the pores of the adhesive tape with the porous structure or/and the shapes of the pores are the same; the distance between the edges of the two holes is equal; the shape of the holes is selected from at least one of a circle, a rectangle, a regular hexagon, a rhombus, a trapezoid, an ellipse and a triangle.
As an improvement of the electrochemical battery, the adhesive tape covers 2% -30% of the surface area of the bare cell (the coverage area is too large, the use amount is too much, the area of an adhesive overflow area is increased, and the packaging reliability of the cell is influenced); the distance between the edge of one side of the adhesive tape close to the battery degassing packaging edge and the battery degassing packaging edge is greater than or equal to 2mm (a reserved glue overflow area prevents glue overflow from directly entering a degassing packaging edge sealing area to influence packaging reliability).
The invention also comprises a preparation method of the electrochemical cell, which mainly comprises the following steps:
step 1, preparing a naked battery cell: assembling the positive plate, the negative plate and the isolating film to obtain a bare cell for later use;
step 2, setting a bonding layer: adhering the adhesive tape of claim 1 to the surface of a bare cell or the inner side of an outer package, and then placing the bare cell in the outer package bag for top sealing and side sealing;
step 3, preparing a finished battery: drying, injecting, forming, shaping, degassing and sealing the battery cell obtained in the step 2 to obtain a finished product battery cell; and in the formation or/and shaping process, the battery cell is placed in an environment of more than or equal to 45 ℃ or/and a surface pressure of more than or equal to 0.05MPa is applied to the battery cell.
As an improvement of the electrochemical battery preparation method, step 1 the bare cell is a winding type bare cell or/and a laminated type bare cell; the winding type naked electric core is terminated by a cathode or an isolating film.
The cell is placed in an environment with the temperature of more than or equal to 45 ℃ or/and surface pressure with the pressure of more than or equal to 0.05MPa is applied to the cell, the bare cell and the external package are tightly bonded by the adhesive tape, and the bonding force of the adhesive tape on the bare cell and the external package is continuously maintained after the cell is cooled to the temperature of less than 45 ℃ or the pressure applied to the surface of the cell is removed.
Compared with the prior art, the invention has the advantages that:
the bonding layer has bonding force at a lower temperature (less than or equal to 45 ℃), is convenient to operate when the battery core is prepared (usually operated at room temperature), and is adhered to the surface of a naked battery core or/and the inner side of an outer package; and through the bonding force that shows promptly of substrate after the heating (be more than or equal to 45 ℃), can effectual increase the bonding area between naked electric core and the extranal packing, reduce the area that the sticky tape covered naked electric core to practice thrift gluey quantity, reduce the excessive total volume of gluing, prevent that the viscose layer from diffusing to degasification encapsulation limit and influencing the encapsulation effect.
Detailed Description
The present invention and its advantageous effects will be described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.
In the comparative example 1, the following examples were conducted,
preparing a naked battery cell: winding the positive plate, the negative plate and the isolating film to obtain a bare cell for later use;
setting an adhesive layer: selecting fibers with the thickness of 40 mu m as a base material (the adhesive force cannot be shown), and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of an adhesive layer for standby; adhering an adhesive tape to the surface of the bare cell, wherein the adhesive tape covers 50% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is less than 2mm (specifically about 1 mm); then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, performing clamp formation at 60 ℃ and 0.6MPa after the battery cell is fully soaked by electrolyte, and then shaping, degassing and sealing to obtain a finished product battery cell.
Comparative example 2, unlike the comparative example, the present comparative example includes the following steps:
setting an adhesive layer: selecting fibers with the thickness of 40 mu m as a base material (the adhesive force cannot be shown), and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of an adhesive layer for standby; adhering an adhesive tape to the surface of the bare cell, wherein the adhesive tape covers 10% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is less than 2mm (specifically about 1 mm); then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
the rest is the same as the comparative example, and is not described herein.
Example 1, unlike comparative example 2, this example includes the following steps:
setting an adhesive layer: selecting a modified polypropylene film with the thickness of 40 mu m as a base material (the modified polypropylene film shows adhesive force at the temperature of 80 ℃) and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of adhesive layers for standby; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 10% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 6mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, performing clamp formation at 85 ℃ and 0.6MPa after the battery cell is fully soaked by electrolyte, and then shaping, degassing and sealing to obtain a finished product battery cell.
The rest is the same as comparative example 2, and is not described herein.
Embodiment 2, unlike embodiment 1, this embodiment includes the following steps:
setting an adhesive layer: selecting a modified polypropylene film with the thickness of 40 mu m as a base material (the modified polypropylene film shows adhesive force at the temperature of 80 ℃) and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of adhesive layers for standby; the adhesive tape is adhered to the surface of the bare cell, the surface area of the bare cell is covered by the adhesive tape by 2%, and the distance between the adhesive tape and the degassing and packaging edge of the battery is 6mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
the rest is the same as the embodiment 1, and the description is omitted.
Embodiment 3, unlike embodiment 1, this embodiment includes the following steps:
setting an adhesive layer: selecting a modified polypropylene film with the thickness of 40 mu m as a base material (the modified polypropylene film shows adhesive force at the temperature of 80 ℃) and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of adhesive layers for standby; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 15% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 6mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
the rest is the same as the embodiment 1, and the description is omitted.
Embodiment 4, unlike embodiment 1, this embodiment includes the following steps:
setting an adhesive layer: selecting a modified polypropylene film with the thickness of 40 mu m as a base material (the modified polypropylene film shows adhesive force at the temperature of 80 ℃) and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of adhesive layers for standby; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 20% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 6mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
the rest is the same as the embodiment 1, and the description is omitted.
Example 5, unlike example 1, this example includes the following steps:
setting an adhesive layer: selecting a modified polypropylene film with the thickness of 40 mu m as a base material (the modified polypropylene film shows adhesive force at the temperature of 80 ℃) and polyurethane with the thickness of 40 mu m as an adhesive tape consisting of adhesive layers for standby; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 30% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 6mm; then placing the naked battery core in an outer packaging bag for top sealing and side sealing;
the rest is the same as the embodiment 1, and the description is omitted.
Embodiment 6, unlike embodiment 1, this embodiment includes the following steps:
setting an adhesive layer: selecting a hot melt adhesive film with the thickness of 500 mu m as a base material (the adhesive force is shown at the temperature of 45 ℃) and polyacrylate with the thickness of 500 mu m as an adhesive tape consisting of an adhesive layer for standby; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 2% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 8mm; then placing the naked battery core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, performing clamp formation at 45 ℃ and 2MPa after the battery cell is fully soaked by electrolyte, and then shaping, degassing and sealing to obtain a finished product battery cell.
The rest is the same as the embodiment 1, and the description is omitted.
Example 7, unlike example 1, this example includes the following steps:
setting an adhesive layer: selecting a reactive hot melt adhesive film with the thickness of 100 mu m as a base material (the adhesive force is shown at the temperature of 60 ℃) and polyacrylate with the thickness of 100 mu m as an adhesive tape consisting of an adhesive layer for standby; adhering an adhesive tape to the surface of the bare cell, wherein the adhesive tape covers 5% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 4mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, performing clamp formation at 60 ℃ and 1MPa after the electrolyte is fully soaked, and then shaping, degassing and sealing to obtain a finished product battery cell.
The rest is the same as the embodiment 1, and the description is omitted.
Embodiment 8, different from embodiment 1, this embodiment includes the following steps:
setting an adhesive layer: selecting a reactive hot melt adhesive film with the thickness of 0.5 mu m as a base material (the adhesive force is shown at the temperature of 90 ℃) and polyacrylate with the thickness of 3 mu m as an adhesive tape consisting of an adhesive layer for standby; adhering an adhesive tape to the surface of the bare cell, wherein the adhesive tape covers 90% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 2mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, forming after the battery cell is fully soaked by electrolyte, shaping at 95 ℃ and 0.1MPa, degassing and sealing to obtain a finished product battery cell.
The rest is the same as the embodiment 1, and the description is omitted.
Embodiment 9, different from embodiment 8, this embodiment includes the steps of:
setting an adhesive layer: selecting a reactive hot melt adhesive film with the thickness of 3 mu m as a base material (the adhesive force is shown at the temperature of 90 ℃) and polyacrylate with the thickness of 0.5 mu m as an adhesive tape consisting of an adhesive layer for standby; adhering an adhesive tape to the surface of the bare cell, wherein the adhesive tape covers 90% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 2mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
the rest is the same as embodiment 8 and is not described again.
Embodiment 10, different from embodiment 1, this embodiment includes the following steps:
setting an adhesive layer: selecting modified polyethylene with thickness of 5 μm as base material (exhibiting adhesive force at 75 deg.C), and polyacrylate with thickness of 10 μm as adhesive layer; the adhesive tape is adhered to the surface of the bare cell, the surface area of the bare cell is covered by the adhesive tape by 15%, and the distance between the adhesive tape and the degassing and packaging edge of the battery is 4mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, forming after the battery cell is fully soaked by electrolyte, shaping at 90 ℃ and 0.05MPa, degassing and sealing to obtain a finished product battery cell.
The rest is the same as the embodiment 1, and the description is omitted.
Embodiment 11, different from embodiment 10, this embodiment includes the steps of:
setting an adhesive layer: selecting 10 μm modified polyethylene as base material (exhibiting adhesive force at 75 deg.C), and 5 μm polyacrylate as adhesive layer; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 15% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 4mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, forming after the battery cell is fully soaked by electrolyte, shaping at 90 ℃ and 0.5MPa, degassing and sealing to obtain a finished product battery cell.
The rest is the same as embodiment 10 and is not described again.
Embodiment 12, different from embodiment 10, this embodiment includes the steps of:
preparing a naked battery cell: laminating the positive plate, the negative plate and the isolating film to obtain a bare cell for later use;
setting an adhesive layer: selecting modified polyethylene with the thickness of 20 micrometers as a base material (the adhesive force is shown at the temperature of 75 ℃) and the organic silicon pressure-sensitive adhesive with the thickness of 20 micrometers as an adhesive tape consisting of adhesive layers for standby; the adhesive tape is adhered to the surface of the bare cell, the adhesive tape covers 15% of the surface area of the bare cell, and the distance between the adhesive tape and the degassing packaging edge of the battery is 8mm; then placing the naked electric core in an outer packaging bag for top sealing and side sealing;
preparing a finished battery: and drying and injecting the top-sealed battery cell, forming after the battery cell is fully soaked by electrolyte, shaping at 80 ℃ under 3MPa, degassing and sealing to obtain a finished product battery cell.
The rest is the same as that of embodiment 10, and the description is omitted.
The testing process comprises the following steps:
safety test (drop test): 10 batteries were taken out from each of comparative examples 1 to 2 and examples 1 to 12 and subjected to a drop test: fixing the battery in a drop test fixture by using a double faced adhesive tape, testing the initial voltage V0 of the drop test fixture, placing the fixture on a test bench with the height of 1.5m in an environment of room temperature and 25 ℃, enabling the head of the battery core to move downwards in a free-falling manner, and circulating for 10 times to finish the drop test. Testing the final voltage V1 of the electric core after standing for 1H, calculating the voltage drop to be delta V, considering that the drop test is invalid when the delta V is more than 2mV, and counting the number of the invalid voltage; and at the same time, whether the appearance is damaged or not is observed.
Testing the packaging reliability: 30 batteries were taken out from each of comparative examples 1 to 2 and examples 1 to 12 and subjected to a package reliability test: the thickness of the test battery is marked as h1, then the test battery is placed in an environment with the temperature of 60 ℃ and the humidity of 95% for baking for 30 days, a sample is taken out, and when the temperature of the sample is reduced to the room temperature, the thickness of the test battery is marked as h2; and when the (h 2-h 1)/h 1 is more than 10%, the packaging is considered to be invalid, and the number of the packaging invalid cells is counted.
TABLE 1 summary of test results of each comparative example and example
Compared with the comparative examples and the embodiments, the battery packaging method can effectively improve the anti-falling performance of the battery cell and greatly improve the packaging reliability of the battery. The base material with adhesive force at a certain temperature (more than or equal to 45 ℃) is used, so that the adhesive area between the naked battery cell and the outer package can be greatly increased, the adhesive force is improved, and the dropping performance of the battery cell is improved; meanwhile, the area of the bare cell covered by the adhesive layer can be reduced, the using amount of the adhesive layer is reduced, the adhesive overflowing amount is reduced, and the risk that the overflowing adhesive is diffused to the degassing packaging edge is reduced; and the distance between the adhesive layer and the degassing packaging edge is increased, so that the risk of the overflowing glue diffusing to the degassing packaging surface is also reduced, and the problem of the packaging reliability of the battery cell is finally solved.
From the comparative example and the examples 1 to 5, the invention can greatly improve the dropping performance and the packaging reliability of the battery cell while reducing the coverage rate (namely the using amount of the glue layer) of the glue layer.
According to the embodiments, when the proper substrate thickness h1, the proper adhesive layer thickness h2, the substrate adhesive force temperature, the coverage area, the distance between the adhesive layer and the degassing edge, the formation/shaping temperature and the formation/shaping surface pressure are selected, the dropping performance and the packaging reliability of the battery can be effectively solved; the invention has universality.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides an electrochemical cell, includes naked electric core, electrolyte and extranal packing, its characterized in that, naked electric core with be provided with the adhesive tape layer between the extranal packing, the adhesive tape layer includes substrate and adhesive linkage, the adhesive linkage adhere to in a surface of substrate, its characterized in that:
the thickness h1 of the base material is 0.5 to 500 [ mu ] m, and the base material shows adhesive property when heated to 45 ℃ or higher;
the thickness h2 of the adhesive layer is 0.5-500 μm, and the adhesive layer exhibits adhesive properties at a temperature of 45 ℃ or less;
the adhesive tape covers 2% -90% of the surface area of the bare cell.
2. An electrochemical cell according to claim 1, wherein the substrate is selected from at least one of reactive hot melt adhesives, polyethylene, modified polyethylene, polypropylene and modified polypropylene, and has a thickness h1 of 3 μm to 100 μm; the substrate exhibits adhesive properties when heated to greater than or equal to 60 ℃.
3. The electrochemical cell of claim 1 wherein said substrate has no adhesive properties at a temperature of 60 ℃ or less.
4. The electrochemical cell of claim 1, wherein the adhesive layer is at least one selected from the group consisting of silicone pressure sensitive adhesive, polyvinylidene fluoride, styrene butadiene rubber, polyurethane, and polyacrylate, and has a thickness h2 of 3 μm to 100 μm.
5. An electrochemical cell according to claim 1, wherein the tape is a porous tape, the area of the porous region is S1, and the area of the non-porous region is S2.
6. An electrochemical cell according to claim 5, wherein (S2 xh 1)/(S1 xh 2) is 2 or less; the size of the pores of the porous adhesive tape or/and the shape of the pores are the same; the distance between the adjacent edges of two adjacent holes is equal; the shape of the holes is selected from at least one of a circle, a rectangle, a regular hexagon, a rhombus, a trapezoid, an ellipse and a triangle.
7. The electrochemical cell of claim 1, wherein the tape covers 2% to 30% of the surface area of the bare cell; the distance between the edge of one side of the adhesive tape close to the battery degassing packaging edge of the outer package and the battery degassing packaging edge is more than or equal to 2mm.
8. A method of making an electrochemical cell according to claim 1, comprising the steps of:
step 1, preparing a naked battery cell: assembling the positive plate, the negative plate and the isolating film to obtain a bare cell for later use;
step 2, setting a bonding layer: adhering the adhesive tape of claim 1 on the surface of a bare cell or the inner side of an outer package, and then placing the bare cell in the outer package bag for top sealing and side sealing;
step 3, preparing a finished battery: drying, injecting, forming, shaping, degassing and sealing the battery cell obtained in the step 2 to obtain a finished product battery cell; and in the formation or/and shaping process, the battery cell is placed in an environment of more than or equal to 45 ℃ or/and a surface pressure of more than or equal to 0.05MPa is applied to the battery cell.
9. The method for preparing the electrochemical cell of claim 8, wherein the bare cell in step 1 is a winding bare cell or/and a laminated bare cell; the winding type naked electric core is terminated by a cathode or an isolating film.
10. The method for preparing the electrochemical cell of claim 8, wherein the bare cell and the external package are tightly bonded by the adhesive tape after the cell is placed in an environment at a temperature of 60 ℃ or higher and/or a surface pressure of 0.1MPa or higher is applied to the cell, and the bonding force of the adhesive tape to the bare cell and the external package is continuously maintained after the cell is cooled to a temperature below 60 ℃ or the pressure applied to the surface of the cell is removed.
Priority Applications (1)
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| US10147972B2 (en) * | 2014-01-23 | 2018-12-04 | Dongguan Amperex Technology Limited | Lithium ion battery having tape with adhesive adhering wound-type cell to packaging film |
| CN109423227A (en) * | 2017-07-19 | 2019-03-05 | 东莞新能源科技有限公司 | Single side glue material and secondary cell |
| CN110379942A (en) * | 2018-04-12 | 2019-10-25 | 宁德新能源科技有限公司 | Battery core component and electrochemical appliance |
| CN111029637A (en) * | 2019-12-06 | 2020-04-17 | 东莞市甬维科技有限公司 | Bonding process of battery bottom cover and battery core |
| CN112054246A (en) * | 2020-09-16 | 2020-12-08 | 江西安驰新能源科技有限公司 | Preparation process of high-efficiency lithium ion battery |
| CN112063316A (en) * | 2019-06-11 | 2020-12-11 | 万向一二三股份公司 | Compound PET sticky tape of lithium ion battery |
| CN112713318A (en) * | 2020-12-28 | 2021-04-27 | 惠州亿纬锂能股份有限公司 | Hot-pressing shaping method for winding core |
| WO2021134788A1 (en) * | 2020-01-03 | 2021-07-08 | 宁德新能源科技有限公司 | Battery core, and electrochemical apparatus and electronic apparatus comprising battery core |
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