CN116929950A - Evaluation testing tool and method for high temperature resistance of aluminum plastic film in different states - Google Patents

Evaluation testing tool and method for high temperature resistance of aluminum plastic film in different states Download PDF

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Publication number
CN116929950A
CN116929950A CN202310677076.7A CN202310677076A CN116929950A CN 116929950 A CN116929950 A CN 116929950A CN 202310677076 A CN202310677076 A CN 202310677076A CN 116929950 A CN116929950 A CN 116929950A
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Prior art keywords
plastic film
aluminum plastic
rod
weight
aluminum
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CN116929950B (en
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梁卓
吴博文
陈俊杰
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Guangdong Guanglin Caiyao New Energy Materials Co ltd
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Guangdong Guanglin Caiyao New Energy Materials Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/18—Performing tests at high or low temperatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0033—Weight
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0067—Fracture or rupture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0236—Other environments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0278—Thin specimens
    • G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens
    • 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 an evaluation and test tool and a method for high temperature resistance of an aluminum plastic film in different states. The testing tool comprises a clamp assembly for expanding an aluminum plastic film, a hanging rod connected with the top of the clamp assembly, a balance weight rod connected with the bottom of the clamp assembly, a weight table arranged at the lower end of the balance weight rod, and a base arranged at the bottom end of the balance weight rod; the top of the base is provided with a guide groove for accommodating the counterweight rod; the tool is used for clamping a sample to be tested into the clamp assembly, placing the sample in a constant temperature and humidity environment, placing a target weight on the counterweight rod, and then releasing the counterweight rod to test. Therefore, under the condition of constant temperature and humidity, a constant force can be applied to a sample to be tested, so that the situation that defects are generated due to the fact that the heat sealing layer of the aluminum plastic film is stressed slowly under the condition of constant force can be accurately simulated, the performance of the aluminum plastic film can be accurately evaluated based on the situation, and the relationship between the heat sealing process of the aluminum plastic film and the high temperature resistance performance of the aluminum plastic film is researched by utilizing the result, so that the heat sealing process of the aluminum plastic film is guided.

Description

Evaluation testing tool and method for high temperature resistance of aluminum plastic film in different states
Technical Field
The invention relates to the field of lithium battery soft packages, in particular to an evaluation and test tool and method for high temperature resistance of an aluminum plastic film in different states.
Background
Along with the rising of new energy automobiles, the application requirement of the soft-package lithium battery on the new energy automobiles is urgent. At present, the full popularization and use of the soft-package lithium battery on a new energy automobile mainly have two worries, one is the problem of the operation reliability of the soft-package lithium battery, including but not limited to the service life, the use temperature interval and the like, and the other is the problem of the safety performance, especially the stability of the lithium battery under various environments and the capability of not generating great danger when the lithium battery fails. The aluminum-plastic film is used as the outermost layer material of the soft-package lithium battery and is also the main material for contacting with electrolyte, and the method directly affects whether the manufactured soft-package lithium battery is safe enough or not, so how to accurately and effectively evaluate the safety performance of the aluminum-plastic film is an important reference when the soft-package lithium battery is selected for use.
The aluminum plastic film industry in the market judges the safety performance of the battery after the battery is manufactured, and two most common methods are adopted. One is to prepare a simulated battery entirely according to the process flow, then place the battery in an extreme environment for a period of time until the battery is broken, and take the breakage time as an evaluation criterion. The battery simulation method can intuitively and effectively simulate various conditions of the battery in the actual use process, and can judge the failure time of the soft package lithium battery under different conditions. However, there are several problems that, firstly, after the battery is completely prepared, the risk is not simply affected by the aluminum plastic film, but the overall performance of the battery is expressed, and a battery design scheme with better overall performance can be optimized during testing, but the risk is simply lost when the aluminum plastic film is selected. Secondly, if the battery is completely prepared and charged, the actual situation can be reacted, but the risk of the battery is greatly increased under the extreme environment, the battery is required to be tested in an explosion-proof cabinet, the test of a large sample size cannot be carried out at one time, and the cost is not good. Finally, the simulated battery needs to ensure perfect sealing, and the aluminum plastic film is made of a non-transparent material, so that the change condition of the heat sealing position cannot be observed from the inside, and the judgment of the failure mode and the specific failure time is error.
And the other is to use a pulling machine to measure the packaging strength of the aluminum plastic film in heat sealing under a certain width and observe the state of a heat sealing surface so as to judge the safety performance in the actual use process. The heat sealing strength testing mode can be used for efficiently and rapidly comprehensively testing the difference between all batches of aluminum plastic films, but cannot reflect various environmental conditions under the actual working condition of the battery. In addition, the tensile machine breaks through the use limit of the aluminum plastic film with larger force so as to represent the performance of the aluminum plastic film, the test speed is fast, the representation is not obvious in terms of durability, and the situation that the heat sealing layer is slowly stressed and defects are generated under the condition of constant force is difficult to simulate. For example, the patent with publication number CN114136880a provides a method for testing anti-pollution melt adhesive of an aluminum plastic film, but the method tests the aluminum plastic film through a tensile machine, so that the method has a certain difference from the actual environment, and therefore, the performance evaluation of the aluminum plastic film can be affected. Therefore, the design of the aluminum plastic film heat sealing resistance detection device can detect the aluminum plastic film heat sealing resistance with constant force under different environments.
Therefore, it is necessary to design a tool and a method for evaluating the high temperature resistance of the aluminum plastic film in different states to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an evaluation and test tool and a method for high temperature resistance of an aluminum plastic film in different states, which are used for safely detecting the heat sealing resistance of the aluminum plastic film by controlling constant force mechanically and physically in different environments.
In order to achieve the above purpose, the invention provides an evaluation testing tool for high temperature resistance of an aluminum plastic film in different states, wherein the testing tool is placed under the condition of constant temperature and constant humidity and comprises a clamp assembly for expanding the aluminum plastic film, a hanging rod connected with the top of the clamp assembly, a balance weight rod connected with the bottom of the clamp assembly, a weight table arranged at the lower end of the balance weight rod and a base arranged at the bottom end of the balance weight rod; the base top is provided with a guide slot for accommodating the tapered opening of the weight rod.
Further, the evaluation testing tool for the high temperature resistance of the aluminum plastic film in different states further comprises a plurality of brackets, an operation center, a pressure switch and a time timer, wherein the brackets are used for conveying weight sets to the weight rods and are positioned above the weight tables, the operation center is connected with the brackets through electric signals, the pressure switch is arranged at the bottom of the hole of the guide groove, and the time timer is connected with the pressure switch through electric signals.
Further, the conditions of constant temperature and humidity are provided by a constant temperature and humidity box, and the hanging rod is connected with the top of the constant temperature and humidity box.
Further, the clamp assembly comprises an upper clamp and a lower clamp arranged right below the upper clamp; the clamp assembly is connected with the suspension rod through the upper clamp; the clamp assembly is connected with the counterweight rod through the lower clamp.
Further, the upper clamp and the lower clamp comprise clamp bases, a pair of pressing blocks I arranged on one side in a cavity of each clamp base, a pair of pressing blocks II symmetrically arranged with the pair of pressing blocks I, and a pushing rod arranged on the outer side of the pair of pressing blocks II.
Further, one surface of the first pair of pressing blocks, which is opposite to the second pair of pressing blocks, is a serrated surface, and the pushing rod is a threaded round rod.
The invention also provides an evaluation and test method for the high temperature resistance of the aluminum plastic film in different states, which adopts the evaluation and test tool for the high temperature resistance of the aluminum plastic film in different states for testing, and comprises the following steps:
sa, taking an aluminum plastic film to be measured, cutting the aluminum plastic film into a target size, folding the aluminum plastic film along one side, and performing heat sealing; then uniformly cutting a plurality of parts of the heat-sealed aluminum-plastic film along the direction perpendicular to the heat seal strip, and obtaining a sample aluminum-plastic film; equally dividing the cut sample aluminum plastic films into a plurality of groups;
sb, respectively placing the aluminum plastic films of the samples in different medium environments, standing for a preset time, taking out, and then sequentially drying and cooling;
sc, adjusting the environment in the constant temperature and humidity box to a preset environment;
sd, a bracket advances, the counterweight rod is supported, and the counterweight rod is connected with the lower clamp;
se, clamping one side of the sample aluminum-plastic film processed in the step Sb after being unfolded and straightened into an upper clamp, clamping one side of the sample aluminum-plastic film into a lower clamp, placing the sample aluminum-plastic film strip in the constant-temperature constant-humidity box, withdrawing the bracket I after the sample aluminum-plastic film strip is kept stable, starting to count by the time timer, maintaining until reaching the target time, and recording as an initial load; after the target time is over, the first bracket advances to support the weight balance rod, then the target weight is placed on the second bracket, the second bracket is withdrawn after the target weight is sent to the weight balance rod, the target weight is dropped on the weight balance rod, the first bracket is withdrawn again to release the weight balance rod, the target time is maintained, and the first bracket is recorded as a load; and after the target time is over, the bracket I advances to support the weight balance rod, then the bracket III carrying the target weight repeats the operation of the bracket II and is recorded as a load II, so that the load quantity is continuously increased under the previous load until the sample aluminum-plastic film is torn, namely, when the weight balance rod falls and contacts with the pressure switch, the time timer stops timing.
Further, in step Sa, the distance between the heat-sealing position and the fold formed after the aluminum-plastic film to be tested is folded in half accounts for 1/6-1/2 of the length of the folded edge after the folding; the heat sealing temperature is 160-200 ℃.
Further, the different medium environments in the step Sb comprise air, water, mixed solution, lithium hexafluorophosphate electrolyte and lithium hexafluorophosphate electrolyte containing 1500ppm of water; the mixed solution comprises methyl ethyl carbonate, dimethyl carbonate and dimethyl carbonate, and the mass ratio of the mixed solution is as follows: methyl ethyl carbonate, dimethyl carbonate=1:1:1; the preset time is 12-48 h; the drying process is as follows: and drying at 35-45 ℃ until no liquid exists on the surface of the sample aluminum plastic film.
Further, the predetermined environment in step Sc is: the humidity is 75-95% and the temperature is 0-100 ℃.
The beneficial effects of the invention are as follows:
1. the invention provides an evaluation and test tool for high temperature resistance of an aluminum plastic film in different states, which is placed under the condition of constant temperature and constant humidity and comprises a clamp assembly for expanding the aluminum plastic film, a hanging rod connected with the top of the clamp assembly, a counterweight rod connected with the bottom of the clamp assembly, a weight table arranged at the lower end of the counterweight rod, and a base arranged at the bottom end of the counterweight rod, wherein the top of the base is provided with a guide groove for accommodating a conical opening of the counterweight rod.
2. According to the evaluation and test method for the high temperature resistance of the aluminum plastic film in different states, the prepared aluminum plastic film is clamped into the clamp assembly by adopting the evaluation and test tool for the high temperature resistance of the aluminum plastic film in different states, the clamp assembly is placed in a constant temperature and humidity box with a good environment, and after a weight with target weight is placed on the weight rod by using the bracket, the weight rod is released until the aluminum plastic film to be tested is torn, and the test is finished. Therefore, under the condition of providing a constant temperature and humidity, a constant force is applied to the clamp assembly, the situation that defects are generated due to the fact that the heat sealing layer of the aluminum plastic film is stressed slowly under the condition of the constant force can be accurately simulated, and further the performance of the aluminum plastic film is evaluated more accurately and comprehensively, and economic losses caused by evaluation errors are avoided.
3. The invention provides an evaluation testing tool for high temperature resistance of an aluminum plastic film in different states, which further comprises a plurality of brackets, an operation center, a pressure switch and a time timer, wherein the brackets are used for conveying weight sets to a weight rod and are positioned above a weight table; the control center is used for controlling the advancing and retreating of the brackets, weights with different specifications can be accurately applied to the constant temperature and humidity box, and the state of a sample to be tested is recorded in time, so that the opening of an environment cabin door is avoided, the error caused by the change of experimental environment factors to an experiment is reduced, and the performance of the aluminum plastic film to be tested under different environments can be automatically detected simply, conveniently and efficiently.
4. Based on the evaluation and test tool and the evaluation and test method for the high temperature resistance of the aluminum plastic film in different states, the performance of the aluminum plastic film can be evaluated truly and accurately, and the relationship between the heat sealing process of the aluminum plastic film and the high temperature resistance of the aluminum plastic film is researched by using the accurate evaluation result, so that the optimization of the heat sealing process of the aluminum plastic film is guided.
Drawings
Fig. 1 is a schematic structural diagram of an evaluation test tool for high temperature resistance of an aluminum plastic film in different states.
Fig. 2 is a schematic structural diagram of a connection relationship between a hanging rod and an upper clamp in an evaluation test tool for high temperature resistance of an aluminum plastic film in different states.
Fig. 3 is a schematic structural diagram of a base in an evaluation test tool for high temperature resistance of an aluminum plastic film in different states.
Fig. 4 is a schematic structural diagram of a fixture in an evaluation test tool for high temperature resistance of an aluminum plastic film in different states.
Drawings
11-mounting a clamp; 12-lower clamp; 111-a clamp seat; 112-pair of pressing blocks I; 113-pressing the second block; 114-pushing the rod; 2-hanging rods; 3-a weight bar; 4-a weight table; 5-a base; 51-a guide groove; 61-bracket one; 62-a bracket II; 63-bracket three; 7-weight stack.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1-4, an evaluation test tool for high temperature resistance of an aluminum plastic film in different states, wherein the test tool is placed under a constant temperature and constant humidity condition, and comprises: the aluminum plastic film stretching device comprises a clamp assembly for stretching an aluminum plastic film, a hanging rod 2 connected with the top of the clamp assembly, a balance weight rod 3 connected with the bottom of the clamp assembly, a weight table 4 arranged at the lower end of the balance weight rod 3, and a base 5 arranged at the bottom end of the balance weight rod 3; the top of the base 5 is provided with a guide groove 51 for receiving the tapered opening of the weight rod 3.
By the arrangement, a constant force can be applied to the clamp assembly under the condition of constant temperature and humidity, so that the influence result on the performance under the action of the real-time constant force can be accurately simulated for the sample to be tested.
Further, in some embodiments of the present invention, the evaluation test tool for high temperature resistance of an aluminum plastic film in different states further includes: the weight set 7 is arranged on the weight rod 3, a plurality of brackets positioned above the weight table 4, a control center connected with the brackets through electric signals, a pressure switch arranged at the bottom of the hole of the guide groove 51 and a time timer connected with the pressure switch through electric signals. The conditions of constant temperature and humidity are provided by a constant temperature and humidity box, and the hanging rod 2 is connected with the top of the constant temperature and humidity box.
The device can efficiently and automatically detect the performance of the aluminum plastic film to be detected in different environments, is simple and convenient to operate, and is beneficial to industrialized popularization.
Further, in some embodiments of the present invention, the clamp assembly includes an upper clamp 11, a lower clamp 12 disposed directly below the upper clamp 11, the upper clamp 11 and the lower clamp 12 being mirror images of each other; the clamp assembly is connected with the hanging rod 2 through the upper clamp 11; the clamp assembly is connected with the weight bar 3 through the lower clamp 12. The upper clamp 11 and the lower clamp 12 each comprise a clamp seat 111, a pair of pressing blocks 112 arranged on one side in a cavity of the clamp seat 111, a pair of pressing blocks 113 symmetrically arranged with the pair of pressing blocks 112, and a pushing rod 114 arranged on the outer side of the pair of pressing blocks 113. The surface of the first pair of press blocks 112 opposite to the second pair of press blocks 113 is a serrated surface, the pushing rod 114 is a threaded round rod, and when in use, the pushing rod 114 is rotated to squeeze the second pair of press blocks 113 to the first pair of press blocks 112 so as to be engaged.
Further, the invention provides an evaluation and test method for the high temperature resistance of the aluminum plastic film in different states, which adopts the evaluation and test tool for the high temperature resistance of the aluminum plastic film in different states for testing, and comprises the following steps:
sa, taking an aluminum plastic film to be measured, cutting the aluminum plastic film into a target size, folding the aluminum plastic film along one side, and performing heat sealing; then uniformly cutting a plurality of parts of the heat-sealed aluminum-plastic film along the direction perpendicular to the heat seal strip, and obtaining a sample aluminum-plastic film; equally dividing a plurality of cut samples of the aluminum plastic film into five groups; the distance between the heat-sealing position and the crease formed after the aluminum plastic film to be tested is folded in half accounts for 1/6-1/2 of the length of the folded edge after the folded edge is folded in half; the heat sealing temperature is 160-200 ℃.
Sb, respectively placing five groups of sample aluminum-plastic films in air, water, a mixed solution, lithium hexafluorophosphate electrolyte and 1500ppm water-containing lithium hexafluorophosphate electrolyte five medium environments, standing for 12-48 hours, taking out, and then sequentially drying and cooling; the mixed solution comprises methyl ethyl carbonate, dimethyl carbonate and dimethyl carbonate, and the mass ratio of the mixed solution is as follows: methyl ethyl carbonate, dimethyl carbonate=1:1:1; the drying process is as follows: and drying at 35-45 ℃ until the surface of the treated sample aluminum plastic film is free of liquid.
Sc, adjusting the environment in the constant temperature and humidity box to be: the humidity is 75-95%, and the temperature is 0-100 ℃;
sd, advancing a bracket one 61, lifting up the weight bar 3 and connecting the weight bar with the lower clamp 12;
se, clamping one side of the sample aluminum-plastic film subjected to the Sb treatment into an upper clamp 11 after the sample aluminum-plastic film is unfolded and straightened, and clamping one side of the sample aluminum-plastic film into a lower clamp 12; placing the sample aluminum plastic film treated in the step Sb in the constant temperature and humidity box, withdrawing the first bracket 61 after the sample aluminum plastic film is kept stable, starting to count by the time timer, and keeping the time until reaching the target time, and recording the time as an initial load; after the target time is over, the first bracket 61 is advanced to support the weight rod 3, then a target weight is placed on the second bracket 62, the second bracket 62 is retracted after the target weight is sent to the weight rod 3, the target weight is dropped on the weight rod 3, and the first bracket 61 is retracted again to release the weight rod 3 and maintain the target time, which is recorded as a load one; after the target time is over, the first bracket 61 is advanced to support the weight rod 3, then the third bracket 63 carrying the target weight repeats the operation of the second bracket 62 and is marked as a second load, so that the load is continuously increased again under the last load until the aluminum plastic film of the sample is torn, namely, when the weight rod 3 falls and contacts the pressure switch, the time timer stops counting. Wherein the movement direction of the bracket can be mechanically operated or manually operated.
So set up, adopt the aassessment test tool to the high temperature resistance under the plastic-aluminum membrane different states, not only can evaluate the security performance of plastic-aluminum membrane like this safely, can accurately simulate the circumstances that the plastic-aluminum membrane heat-seal layer slowly atress produced the defect under the constant force circumstances moreover, can more accurately and comprehensively evaluate the plastic-aluminum membrane performance, avoided the economic loss that evaluation error brought.
The working modes of the evaluation testing tool and the method for the high temperature resistance of the aluminum plastic film in different states are described as follows:
examples
The embodiment provides an evaluation and test method for high temperature resistance of an aluminum plastic film in different states, which adopts the evaluation and test tool for the high temperature resistance of the aluminum plastic film in different states for testing, and comprises the following steps:
sa, a group of aluminum plastic films to be tested are taken, the direction parallel to the grain of the aluminum plastic films is defined as transverse, a cutter is used for cutting the aluminum plastic films into two types of samples with the width (the edge vertical to the grain of the aluminum plastic films) of 300mm, the length (the edge parallel to the grain of the aluminum plastic films) of 150mm and the width of 150mm and the length of 300mm, then the two types of samples are folded in half along the respective long edge to form a 150mm folded aluminum plastic film, and then the two types of samples are heat-sealed along the position 50mm away from the fold, so that two heat sealing modes (namely transverse heat sealing and longitudinal heat sealing are achieved when the heat sealing direction is parallel to the grain on the aluminum plastic films and longitudinal heat sealing are achieved when the heat sealing direction is vertical to the grain on the aluminum plastic films); simultaneously, two groups of heat seals are arranged in the same heat seal direction: 175 ℃, 195 ℃, wherein the heat sealing time is 4s, the heat sealing pressure is 0.3MPa, and the heat sealing times are numbered: A. b, C, D, specifically as shown in table 1; then uniformly cutting 10 parts of the heat-sealed aluminum-plastic film along the direction perpendicular to the heat seal, wherein the width of each part is 15mm, and obtaining a sample aluminum-plastic film; equally dividing the cut aluminum plastic films of the samples into five groups of 30 samples according to requirements, and numbering the samples, wherein the specific example is shown in table 2;
sb, respectively placing five groups of sample aluminum-plastic films in air, water and a mixed solution (the mixed solution comprises methyl ethyl carbonate, dimethyl carbonate and dimethyl carbonate, the mass ratio of the mixed solution is that methyl ethyl carbonate, dimethyl carbonate, lithium hexafluorophosphate electrolyte and lithium hexafluorophosphate electrolyte containing 1500ppm of water are placed in five medium environments for 24 hours, then taking out the mixture, wiping residual liquid by using dust-free cloth, then placing the mixture in a drying oven for blowing and keeping the temperature at 40 ℃ until the surface is free of liquid, and cooling;
sc, setting the environment in a constant temperature and humidity box connected by the suspension rod 2 as: setting up 11 groups of environments at the temperature of 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃ and 100 ℃ in an environment with 85% humidity, sequentially adding temperature data as marks after sample names, and comparing and analyzing;
sd, advancing a bracket one 61, lifting up the weight bar 3, and connecting the weight bar 3 with the lower clamp 12;
se, clamping one side of the sample aluminum-plastic film subjected to the Sb treatment into an upper clamp 11 after the sample aluminum-plastic film is unfolded and straightened, and clamping one side of the sample aluminum-plastic film into a lower clamp 12; placing the sample aluminum plastic film treated in the step Sb in a constant temperature and humidity box, withdrawing the first bracket 61 after the sample aluminum plastic film is kept stable, starting to count by the time timer, and keeping for 24 hours, and recording as an initial load (at the moment, the load is 5 kg); after 24 hours are over, the first bracket 61 is advanced to support the weight bar 3, then a 3kg weight is placed on the second bracket 62, and after the 3kg weight is sent to the weight bar 3, the second bracket 62 is retracted to enable the 3kg weight to fall on the weight bar 3, and the first bracket 61 is retracted to release the weight bar 3 and maintain for 24 hours, and the weight bar is marked as a first load (at this time, the load is 8 kg); after 24 hours, the first bracket 61 advances to support the weight rod 3, then the third bracket 63 carrying a weight of 2kg repeats the operation of the second bracket 62, which is denoted as a load two (the load is 10kg at this time), so that the load amount is continuously increased again under the previous load until the aluminum plastic film of the sample is torn, that is, when the weight rod falls and contacts the pressure switch, the time timer stops counting.
The standard of the qualification of the aluminum plastic film of the sample is as follows: under the conditions of air and water medium, the sample aluminum plastic film at 0-80 ℃ is free from tearing phenomenon under the load of 10kg (namely, the tearing time is more than or equal to 3D); the sample aluminum-plastic film at 90-100 ℃ is free from tearing phenomenon under the load of 8kg (namely, the tearing time is more than or equal to 2D);
under the medium of a composite solvent and an electrolyte, the sample aluminum plastic film at 0-80 ℃ is free from tearing phenomenon under the load of 8kg (namely, the tearing time is more than or equal to 2D); the sample aluminum-plastic film at 90-100 ℃ is free from tearing phenomenon under the load of 8kg (namely, the tearing time is more than or equal to 1D12 h);
under the condition of a lithium hexafluorophosphate electrolyte medium containing 1500ppm of water, the sample aluminum-plastic film at 0-60 ℃ is free from tearing phenomenon (namely, the tearing time is more than or equal to 2D) under the load of 8 kg; the sample aluminum plastic film is not torn under the load of 5kg at 70-100 ℃ (namely, the tearing time is more than or equal to 1D).
The test results of the aluminum plastic films of the samples in the embodiment are shown in table 3, the transverse heat sealing effect of the samples at the low temperature of 175 ℃ does not reach the standard, and the transverse heat sealing effect at the high temperature of 195 ℃ reaches the standard; the effect of longitudinal heat sealing at low and high temperature is up to standard. The sample was heat sealed to a lesser extent in the transverse direction than in the longitudinal direction. When the sample is heat-sealed at low temperature, the performances in water, air and mixed solvent can reach the standards, but partial non-standard items exist in the lithium hexafluorophosphate electrolyte and the aqueous lithium hexafluorophosphate electrolyte; and after the sample is subjected to high-temperature heat sealing, the sample can reach the standard in five mediums.
Based on the above results, it is preferable that the heat seal is performed in the longitudinal direction when the aluminum plastic film is heat-sealed, and the heat seal temperature is preferably 195 ℃.
Table 1 parameters of heat sealing treatment for aluminum plastic film to be tested
Table 2 sample numbering of the aluminium plastic film to be tested under different media
TABLE 3 test results of aluminum plastic films for each sample in example 1
In summary, the invention provides an evaluation and test tool and a method for high temperature resistance of an aluminum plastic film in different states, wherein the test tool is placed under a constant temperature and constant humidity condition and comprises a clamp assembly for expanding the aluminum plastic film, a hanging rod connected with the top of the clamp assembly, a balance weight rod connected with the bottom of the clamp assembly, a weight table arranged at the lower end of the balance weight rod and a base arranged at the bottom end of the balance weight rod; the top of the base is provided with a guide groove for accommodating the conical opening of the counterweight rod, and a plurality of brackets which are used for conveying the counterweight group to the counterweight rod and are positioned above the counterweight table; the prepared aluminum-plastic film is clamped into the clamp assembly by the testing tool provided by the invention, the clamp assembly is placed in a constant temperature and humidity box with a set environment, the weight with the target weight is placed on the weight balancing rod by the bracket, and then the weight balancing rod is released until the aluminum-plastic film to be tested is torn, and the test is finished. Therefore, under the condition of providing a constant temperature and humidity, a constant force is applied to the clamp assembly, the situation that defects are generated due to the fact that the heat sealing layer of the aluminum plastic film is stressed slowly under the condition of the constant force can be accurately simulated, and further the performance of the aluminum plastic film can be evaluated more accurately and comprehensively, and economic losses caused by evaluation errors are avoided; and the test mode is safe and reliable. In addition, a plurality of brackets used for sending weight sets to the weight rod and positioned above the weight table, a control center connected with the brackets through electric signals, a pressure switch arranged at the bottom of the hole of the guide groove and a time timer connected with the pressure switch through electric signals are arranged; the control center is used for controlling the advancing and retreating of the brackets, weights with different specifications can be accurately applied to the constant temperature and humidity box, and the state of a sample to be tested is recorded in time, so that the opening of an environment cabin door is avoided, the error caused by the change of experimental environment factors to an experiment is reduced, and the performance of the aluminum plastic film to be tested under different environments can be automatically detected simply, conveniently and efficiently. Based on the evaluation and test tool and the evaluation and test method for the high temperature resistance of the aluminum plastic film in different states, the performance of the aluminum plastic film can be evaluated truly and accurately, and the relationship between the heat sealing process of the aluminum plastic film and the high temperature resistance of the aluminum plastic film is researched by using the accurate evaluation result, so that the optimization of the heat sealing process of the aluminum plastic film is guided.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. An evaluation test tool for high temperature resistance performance of an aluminum plastic film in different states, which is characterized by comprising: the device comprises a clamp assembly for expanding an aluminum plastic film, a hanging rod connected with the top of the clamp assembly, a balance weight rod connected with the bottom of the clamp assembly, a weight table arranged at the lower end of the balance weight rod, and a base arranged at the bottom end of the balance weight rod; the base top is provided with a guide slot for accommodating the tapered opening of the weight rod.
2. The evaluation and test tool for high temperature resistance of an aluminum plastic film in different states according to claim 1, further comprising: the weight table comprises a weight bar, a plurality of brackets, a control center, a pressure switch and a time timer, wherein the weight bar is used for being sent to the weight bar, the brackets are positioned above the weight table, the control center is connected with the brackets through an electric signal, the pressure switch is arranged at the bottom of a hole of the guide groove, and the time timer is connected with the pressure switch through an electric signal.
3. The evaluation and test tool for high temperature resistance of an aluminum plastic film in different states according to claim 1, wherein: the conditions of constant temperature and humidity are provided by a constant temperature and humidity box, and the hanging rod is connected with the top of the constant temperature and humidity box.
4. The evaluation and test tool for high temperature resistance of an aluminum plastic film in different states according to claim 1, wherein: the clamp assembly comprises an upper clamp and a lower clamp arranged right below the upper clamp; the clamp assembly is connected with the suspension rod through the upper clamp; the clamp assembly is connected with the counterweight rod through the lower clamp.
5. The evaluation and test tool for high temperature resistance of an aluminum plastic film in different states according to claim 4, wherein: the upper clamp and the lower clamp comprise clamp bases, a pair of pressing blocks I arranged on one side in a cavity of each clamp base, a pair of pressing blocks II symmetrically arranged with the pair of pressing blocks I, and a pushing rod arranged on the outer side of the pair of pressing blocks II.
6. The evaluation and test tool for high temperature resistance of an aluminum plastic film in different states according to claim 5, wherein: the surface of the first pair of pressing blocks, which is opposite to the second pair of pressing blocks, is a serrated surface, and the pushing rod is a threaded round rod.
7. An evaluation test method for high temperature resistance of an aluminum plastic film in different states is characterized by adopting the test tool as set forth in any one of claims 1-6 for testing, and comprising the following steps:
sa, taking an aluminum plastic film to be measured, cutting the aluminum plastic film into a target size, folding the aluminum plastic film along one side, and performing heat sealing; then uniformly cutting a plurality of parts of the heat-sealed aluminum-plastic film along the direction perpendicular to the heat seal strip, and obtaining a sample aluminum-plastic film; equally dividing the cut sample aluminum plastic films into a plurality of groups;
sb, respectively placing the aluminum plastic films of the samples in different medium environments, standing for a preset time, taking out, and then sequentially drying and cooling;
sc, adjusting the environment in the constant temperature and humidity box to a preset environment;
sd, a bracket advances, the counterweight rod is supported, and the counterweight rod is connected with the lower clamp;
se, clamping one side of the sample aluminum-plastic film processed in the step Sb after being unfolded and straightened into an upper clamp, clamping one side of the sample aluminum-plastic film into a lower clamp, placing the sample aluminum-plastic film strip in the constant-temperature constant-humidity box, withdrawing the bracket I after the sample aluminum-plastic film strip is kept stable, starting to count by the time timer, maintaining until reaching the target time, and recording as an initial load; after the target time is over, the first bracket advances to support the weight balance rod, then the target weight is placed on the second bracket, the second bracket is withdrawn after the target weight is sent to the weight balance rod, the target weight is dropped on the weight balance rod, the first bracket is withdrawn again to release the weight balance rod, the target time is maintained, and the first bracket is recorded as a load; and after the target time is over, the bracket I advances to support the weight balance rod, then the bracket III carrying the target weight repeats the operation of the bracket II and is recorded as a load II, so that the load quantity is continuously increased under the previous load until the sample aluminum-plastic film is torn, namely, when the weight balance rod falls and contacts with the pressure switch, the time timer stops timing.
8. The evaluation and test method for high temperature resistance of the aluminum plastic film in different states according to claim 7, wherein the evaluation and test method is characterized in that: in step Sa, the distance between the heat-sealing position and the fold formed by folding the aluminum-plastic film to be tested accounts for 1/6-1/2 of the length of the folded edge; the heat sealing temperature is 160-200 ℃.
9. The evaluation and test method for high temperature resistance of the aluminum plastic film in different states according to claim 7, wherein the evaluation and test method is characterized in that: the different medium environments in the step Sb comprise air, water, mixed solution, lithium hexafluorophosphate electrolyte and lithium hexafluorophosphate electrolyte containing 1500ppm of water; the mixed solution comprises methyl ethyl carbonate, dimethyl carbonate and dimethyl carbonate, and the mass ratio of the mixed solution is as follows: methyl ethyl carbonate, dimethyl carbonate=1:1:1; the preset time is 12-48 h; the drying process is as follows: and drying at 35-45 ℃ until no liquid exists on the surface of the sample aluminum plastic film.
10. The evaluation and test method for high temperature resistance of the aluminum plastic film in different states according to claim 9, wherein the evaluation and test method is characterized in that: the predetermined environment in step Sc is: the humidity is 75-95% and the temperature is 0-100 ℃.
CN202310677076.7A 2023-06-08 Evaluation testing tool and method for high temperature resistance of aluminum plastic film in different states Active CN116929950B (en)

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