CN116183380B - Method, device, equipment and medium for detecting flexibility of battery pole piece - Google Patents
Method, device, equipment and medium for detecting flexibility of battery pole piece Download PDFInfo
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- CN116183380B CN116183380B CN202310468130.7A CN202310468130A CN116183380B CN 116183380 B CN116183380 B CN 116183380B CN 202310468130 A CN202310468130 A CN 202310468130A CN 116183380 B CN116183380 B CN 116183380B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
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- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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Classifications
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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
-
- 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
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a method, a device, equipment and a medium for detecting the flexibility of a battery pole piece, wherein the method for detecting the flexibility of the battery pole piece comprises the steps of obtaining a plurality of pole pieces to be detected; the pole pieces to be detected at least comprise a first pole piece and a second pole piece which are the same in specification; wherein the second pole piece comprises a structural weakening portion; acquiring a first tensile strength of a first pole piece and a second tensile strength of a second pole piece; the flexibility of the pole piece to be detected is determined based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a detection method, a detection device, equipment and a medium for flexibility of a battery pole piece.
Background
With the adoption of batteries as power sources in the fields of mobile phones, digital products, notebook computers, unmanned aerial vehicles, aeromodelling, electric tools, military industry, new energy automobiles, portable energy storage, medical equipment and the like, the battery industry is rapidly developed. The battery has wide space for application development, and has higher requirements, and is expected to have higher capacity, good safety, longer cycle life and the like.
Most of the batteries in the current market consist of main components such as cathode and anode plates, isolating films, electrolyte, mechanical parts and the like, wherein the materials, coating weight and compaction density of the cathode and anode plates are important indexes for influencing the capacity of an electric core. Meanwhile, the flexibility of the battery pole piece is affected by a plurality of factors such as raw materials, a coating process, a rolling process, a baking process and the like, and the battery pole piece with different flexibility is suitable for being used for being manufactured by different manufacturing processes, so that different types of batteries are manufactured. The pole piece with poor flexibility influences the advantages and disadvantages of the winding process, so that economic loss is caused, aluminum foil burrs are easily generated due to breakage, and the powder of the membrane falls off, so that the safety performance of the battery cell is influenced, and the detection of the flexibility of the battery pole piece has great significance for battery preparation and production.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present application is to provide a method, a device, equipment and a medium for detecting flexibility of a battery pole piece, so as to realize detection of flexibility of the battery pole piece.
An embodiment of a first aspect of the present application provides a method for detecting flexibility of a battery pole piece, including: obtaining a plurality of pole pieces to be detected; the pole pieces to be detected at least comprise a first pole piece and a second pole piece which are the same in specification; wherein the second pole piece comprises a structural weakening portion; acquiring a first tensile strength of a first pole piece and a second tensile strength of a second pole piece; the flexibility of the pole piece to be detected is determined based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece.
In the technical scheme of the embodiment of the application, the first tensile strength of the first pole piece and the second tensile strength of the second pole piece are obtained on the basis through the first pole piece and the second pole piece with the same specification and comprising the structure weakening part, the flexibility difference of the pole pieces to be detected is amplified through the structure weakening part, and the tensile strength retaining capacity of the pole pieces to be detected with different flexibility is obviously differentiated, so that the flexibility of the pole pieces to be detected is more obviously differentiated; meanwhile, the flexibility of the pole piece to be detected is determined based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece, so that the quantitative characterization of the flexibility of the pole piece to be detected can be realized; in addition, the detection method of the flexibility of the pole piece is easy to operate, and can improve the detection repeatability and reproducibility.
In some embodiments, a plurality of pole pieces to be detected are obtained, wherein the plurality of pole pieces to be detected at least comprise a first pole piece and a second pole piece with the same specification; wherein the second pole piece includes a structural weakening portion comprising: cutting the same battery pole piece to obtain a plurality of pole pieces to be detected with the same specification; weakening at least one pole piece to be detected to form a structural weakening portion, wherein the pole piece to be detected which is not subjected to weakening is used as a first pole piece, and the pole piece to be detected which is subjected to weakening is used as a second pole piece. The same battery pole piece is cut to obtain a plurality of pole pieces to be detected with the same specification, so that the mode of obtaining the pole pieces to be detected is simpler.
In some embodiments, the weakening process comprises: the second pole piece is folded to form at least one crease that acts as a structural weakening. The second pole piece is weakened in a manner of folding the second pole piece to form at least one crease serving as a structural weakening portion, so that the weakening process is simple and quick and easy to realize.
In some embodiments, the weakening process further comprises: a preset pressure is applied to the crease. By applying preset pressure to the folds, the structural weakening degree of the structural weakening part of the second pole piece can be increased, so that the performance change of the pole piece to be detected before and after weakening is amplified, and the flexibility of the pole piece to be detected can be accurately determined.
In some embodiments, applying the preset pressure to the crease comprises: a rolling unit is driven to roll the folds at a preset speed. The crease is rolled at a preset speed by driving the rolling unit, so that the damage force applied to the crease of the pole piece to be detected is kept consistent.
In some embodiments, the direction of travel of the roll-in unit is perpendicular to the direction in which the crease extends. Through limiting the direction of travel of roll-in unit and the direction perpendicular that the crease extends, can further ensure the external force uniformity when the crease makes the structural damage to improve the detection accuracy of this application embodiment.
In some embodiments, obtaining the first tensile strength of the first pole piece and the second tensile strength of the second pole piece comprises: respectively applying a pulling force to the opposite ends of the first pole piece and the second pole piece until the first pole piece and the second pole piece are broken; obtaining the maximum tension before the first pole piece breaks and taking the maximum tension as a first tension value, and obtaining the maximum tension before the second pole piece breaks and taking the maximum tension as a second tension value; determining a first tensile strength based on the first tension value; a second tensile strength is determined based on the second tension value. Applying a pulling force to the opposite ends of the first pole piece and the second pole piece respectively until the pole pieces are broken; obtaining the maximum tension before the first pole piece breaks and taking the maximum tension as a first tension value, and obtaining the maximum tension before the second pole piece breaks and taking the maximum tension as a second tension value; determining a first tensile strength based on the first tension value; the second tensile strength is determined based on the second tensile force value, so that the tensile strength of the pole piece to be detected can be detected efficiently and accurately, and the method has detection repeatability and reproducibility.
In some embodiments, the structural weakness is a crease, and the direction of the tensile force applied to the pole piece to be detected is perpendicular to the direction in which the crease extends. The direction of the pulling force applied to the pole piece to be detected is perpendicular to the extending direction of the crease, so that the pulling force applied to each position of the crease is identical, the second pulling force of the second pole piece is more accurate, and the flexibility accuracy of the pole piece to be detected is further improved.
In some embodiments, determining the flexibility of the pole piece to be detected based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece comprises: calculating the ratio of the first tensile strength to the second tensile strength; and determining the flexibility of the pole piece to be detected based on the ratio. The ratio of the first tensile strength to the second tensile strength can be used as a new index for quantitatively representing the flexibility of the pole piece to be detected, so that the flexibility of the pole piece to be detected can be represented more intuitively.
An embodiment of a second aspect of the present application provides a device for detecting flexibility of a battery pole piece, where the device for detecting flexibility of a battery pole piece includes a detecting unit and a processing unit. The detection unit is configured to obtain the tensile strength of a pole piece to be detected, wherein the pole piece to be detected comprises a first pole piece and a second pole piece; the second pole piece has the same specification as the first pole piece, and the second pole piece is provided with a structure weakening part; the processing unit is configured to determine a flexibility of the pole piece to be detected based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece. The quantitative characterization of the flexibility of the pole piece to be detected can be realized through the detection unit and the processing unit, and the detection repeatability and the reproducibility can be improved.
In some embodiments, the detection device further comprises a weakening unit configured for weakening the second pole piece to form a structural weakening. The flexibility difference of the pole pieces to be detected is amplified through the mode of the structure weakening part, and the tensile strength retention capacities of different pole pieces to be detected are obviously distinguished, so that the flexibility of the pole pieces to be detected is more obviously distinguished.
In some embodiments, the weakening processing unit comprises a folding unit configured for folding the second pole piece to form at least one crease serving as structural weakening. The second pole piece is weakened in a manner of folding the second pole piece to form at least one crease serving as a structural weakening portion, so that the weakening process is simple and quick and easy to realize.
In some embodiments, the weakening unit further comprises a rolling unit configured for rolling the crease. By applying preset pressure to the folds, the structural weakening part of the second pole piece obtained through weakening treatment is more obvious, and therefore the flexibility of the determined pole piece to be detected is more accurate.
In some embodiments, the rolling unit is a roller, and the width of the roller is greater than or equal to the maximum width of the pole piece to be detected along the direction perpendicular to the travelling direction of the roller. The width of running roller is greater than or equal to the maximum width of waiting to detect the pole piece, can ensure that the running roller is in the in-process that the fold is rolled in the fold, and the fold can be rolled in completely to further improve the detection accuracy of this application embodiment.
In some embodiments, the roller weighs greater than or equal to 1 kilogram and less than or equal to 8 kilograms. The roller quality can be set to be more than or equal to 1 kg and less than or equal to 8 kg, and the roller is applicable to pole pieces of various different types, so that the applicability and the application range are greatly improved, and meanwhile, the detection accuracy can be further improved.
In some embodiments, the detection device further comprises a stretching unit configured to apply a pulling force to opposite ends of the pole piece to be detected. The tension unit is used for applying tension to the two ends of the pole piece to be detected, so that the tension applied to the pole piece to be detected can be controlled more accurately, and the pole piece to be detected has detection repeatability and reproducibility.
An embodiment of a third aspect of the present application provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of detecting the flexibility of a battery pole piece as in any of the embodiments.
An embodiment of a fourth aspect of the present application provides a computer readable storage medium storing a computer program, which when executed by a processor implements a method for detecting flexibility of a battery pole piece in any embodiment.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.
FIG. 1 is a flow chart of a method of detecting the flexibility of a battery pole piece according to some embodiments of the present application;
FIG. 2 is a schematic view of a rolling apparatus according to some embodiments of the present application;
fig. 3 is a schematic diagram of a battery pole piece breaking detection device according to some embodiments of the present application;
FIG. 4 is a schematic broken view of a battery pole piece according to some embodiments of the present application;
FIG. 5 is a flow chart of a method of detecting tensile strength of a battery pole piece according to some embodiments of the present application;
FIG. 6 is a block diagram of a device for detecting the flexibility of a battery pole piece according to some embodiments of the present application;
FIG. 7 is a block diagram of another device for detecting the flexibility of a battery pole piece according to some embodiments of the present application;
fig. 8 is a flow chart of a method of detecting battery pole piece flexibility in accordance with some embodiments of the present application.
Reference numerals illustrate:
200. a rolling device; 210. a pole piece to be detected; 211. a first pole piece end; 212. a second pole piece end; 250. a roller; 220. a rotating part; 240. a fixing part; 230. a hand-held part; 300. the battery pole piece breaking detection device; 310. a clamp; 320. a sensor; 330. and a control box.
Detailed Description
Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).
In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
At present, the battery pole piece is manufactured by respectively coating a layer of electrode material on the front side and the back side of an aluminum foil or a copper foil and then rolling, cutting and the like, wherein the flexibility of the battery pole piece has great influence on the research and development of a battery. The battery pole piece with larger brittleness is easy to break the belt or fall powder in the rolling process, and the inner ring battery pole piece is easy to wrinkle, break or fall powder due to larger stress in the battery pole piece winding process, especially in the subsequent bare cell shaping process, the serious quality problems such as breakage, fall powder and the like are easy to occur because the radius of the corner of the inner ring pole piece is very small; and the excessively soft battery pole piece has the problem of sticking to the roller in the rolling process, so that the battery pole piece is scrapped in a large amount. However, the current effective quantitative detection method for the flexibility of the battery pole piece is very deficient, and the fact that the flexibility of the pole piece does not meet the requirement can often be determined only by the occurrence of problems in the production of the battery pole piece.
In the related technology, the brittle damage degree or flexibility of the pole piece is judged by the condition of powder falling or breakage of the folded battery pole piece, subjectivity exists, and the index cannot be quantified; in other detection methods, the flexibility of the battery pole piece is judged by folding the battery pole piece in half and then observing the fracture or light transmission condition of the fold, the method has serious human factors, the judgment standard has no visual quantitative data, and different personnel detection can cause great difference of results and does not have detection repeatability.
Therefore, the application provides a method for detecting the flexibility of the battery pole piece, which weakens part of pole pieces to be detected in the same specification, and detects the tensile strength of the pole pieces to be detected before and after the weakening so as to further realize the detection and quantitative characterization of the flexibility of the battery pole piece. The weakening treatment can amplify the difference of the flexibility of the battery pole pieces, so that the more obvious distinction of the flexibility of the battery pole pieces is realized, the detection and quantitative characterization of the flexibility of the battery pole pieces can be realized more accurately, and the repeatability and reproducibility of the detection method can be improved.
The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.
The cell assembly is the component of the battery cell in which the electrochemical reaction occurs. One or more battery cell assemblies may be contained within the housing. The cell assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally arranged between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode plate and the negative electrode plate with active substances form the main body part of the battery cell assembly, and the parts of the positive electrode plate and the negative electrode plate without active substances form the electrode lugs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the electrode terminal to form a current loop. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like.
Fig. 1 is a flowchart of a method for detecting flexibility of a battery pole piece according to some embodiments of the present application, where, as shown in fig. 1, the method for detecting flexibility of a battery pole piece includes:
step S110, a plurality of pole pieces to be detected are obtained; the pole pieces to be detected at least comprise a first pole piece and a second pole piece which are the same in specification; wherein the second pole piece comprises a structural weakening portion;
step S120, obtaining the first tensile strength of the first pole piece and the second tensile strength of the second pole piece;
step S130, determining flexibility of the pole piece to be detected based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece.
In this embodiment of the present application, the electrode sheet to be detected for flexibility detection may be any type of battery electrode sheet, including but not limited to a lithium battery, a nickel-cadmium battery, a nickel-hydrogen battery, a lead-acid battery, a sodium battery, and the like, and specifically may be an anode sheet or a cathode sheet.
In this embodiment of the present application, the number of the pole pieces to be detected may be two or more, the specification of the pole pieces to be detected may include a pole piece type, a pole piece size, a compaction density, and the like, the pole piece type refers to a battery type to which the pole piece to be detected belongs, a material of the pole piece, such as a foil type, an active material type, and a component, and the pole piece size refers to a length, a width, and a thickness of the pole piece to be detected, and the thickness includes a foil thickness and an active material thickness. The compacted density refers to the compacted density of the active substance on the pole piece to be detected.
The structure weakening portion refers to a part of the pole piece to be detected, which is subjected to weakening treatment and formed with deteriorated structural performance, the weakening treatment refers to a treatment mode that the structure is damaged or destroyed to a certain extent through the action of external force, and the structural performance of the part is further deteriorated compared with that of the part before treatment, for example, one or more weakening treatment modes such as folding, cutting, tearing and the like can be performed on the pole piece to be detected, so that various structure weakening modes such as scratches, folds, cracks or through holes are formed.
The second pole piece may include a structural weakening portion at any location of the second pole piece, and the structural weakening portion may also be of any size, including but not limited to at an intermediate location of the second pole piece. The structural weakening may be formed by artificially damaging the second pole piece manufacturing structure, for example by one or more of cutting, rolling, folding, pulling, etc.
It will be appreciated that the structural form of the structural weakness may be arbitrary. The first pole piece differs from the second pole piece only in that the second pole piece has a structural weakness, whereas the first pole piece does not.
In this embodiment, because the second pole piece includes a structure weakening portion, the tensile strength of second pole piece compares the first pole piece that does not have the structure weakening portion and has the reduction of certain degree, acquires the first tensile strength of first pole piece and the second tensile strength of second pole piece on this basis, and the tensile strength holding capacity of the pole piece that waits to detect that the pliability is different will appear obviously distinguishing.
In the embodiment of the application, the tensile strength is the maximum stress value born by the pole piece before breaking, and the unit is Newton per square millimeter (N/mm < 2 >). The first tensile strength of the first pole piece and the second tensile strength of the second pole piece can be obtained by directly obtaining numerical values, and also can be obtained by detecting the numerical values on site by a detection device.
In the embodiment of the application, the flexibility of the pole piece to be detected can be determined based on the difference value of the first tensile strength of the first pole piece and the second tensile strength of the second pole piece; because the second pole piece is provided with the structure weakening part, the tensile strength of the second pole piece is reduced to a certain extent relative to that of the first pole piece with the same specification, and the flexibility of the pole piece to be detected can be quantitatively calibrated by comparing the change of the tensile strength of the pole pieces before and after weakening.
In the embodiment of the application, the first tensile strength of the first pole piece and the second tensile strength of the second pole piece are obtained on the basis through the first pole piece and the second pole piece with the same specification and comprising the structural weakening part, the flexibility difference of the pole pieces to be detected is amplified through the structural weakening part, and the tensile strength retaining capacities of different pole pieces to be detected are obviously differentiated, so that the flexibility of the pole pieces to be detected is more obviously differentiated; meanwhile, the flexibility of the pole piece to be detected is determined based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece, so that the quantitative characterization of the flexibility of the pole piece to be detected can be realized; in addition, the detection method of the flexibility of the pole piece is easy to operate, and can improve the detection repeatability and reproducibility.
According to some embodiments of the application, a plurality of pole pieces to be detected are obtained, wherein the plurality of pole pieces to be detected at least comprise a first pole piece and a second pole piece with the same specification; wherein the second pole piece includes a structural weakening portion comprising: cutting the same battery pole piece to obtain a plurality of pole pieces to be detected with the same specification; weakening at least one pole piece to be detected to form a structural weakening portion, wherein the pole piece to be detected which is not subjected to weakening is used as a first pole piece, and the pole piece to be detected which is subjected to weakening is used as a second pole piece.
In this embodiment of the present application, the length dimension and the width dimension of the pole piece to be detected may be set to fixed values, for example, the width is 20 millimeters (mm), and the length is 100mm. And selecting a flat and wrinkle-free area of the battery pole piece, and cutting by using a cutter to obtain a rectangular strip-shaped pole piece with the width of 20mm and the length of 100mm, wherein the cut pole piece requires that the edge is flat and the unilateral dimension error is less than 1mm. The cut pole piece is the pole piece to be detected, and the pole piece to be detected is the same in the type, size, compaction density and the like, namely the specification of the pole piece to be detected, because the pole piece to be detected is obtained by cutting the same battery pole piece.
In this embodiment of the present application, the weakening treatment may be an artificial damage to the manufacturing structure of the pole piece to be detected, for example, may be one or more of cutting, rolling, folding, pulling, etc. methods. The structure weakening part can be a trace formed after various structures such as scratches, folds or through holes on the pole piece to be detected are weakened or damaged.
In the embodiment of the application, the same battery pole piece is cut to obtain a plurality of pole pieces to be detected with the same specification, so that the mode of obtaining the pole pieces to be detected is simpler.
According to some embodiments of the present application, the weakening process comprises: the second pole piece is folded to form at least one crease that acts as a structural weakening.
In the embodiment of the application, in the process of folding the second sheet, the second sheet may be folded forward, folded backward or folded alternately forward and backward. Illustratively, the second pole piece is folded by alternately folding the second pole piece in the same direction for 3 times, each time at an angle of 180 degrees. Of course, other folding angles are possible, regardless of folding, as long as the second pole piece is folded and creased.
In the embodiment of the application, the second pole piece is weakened in a manner of folding the second pole piece to form at least one crease serving as the structural weakening portion, so that the weakening process is simple and quick and easy to realize.
According to some embodiments of the present application, the weakening process further comprises: a preset pressure is applied to the crease.
In this embodiment of the present application, the preset pressure is applied to the folded crease, so that the crease of the second pole piece is further structurally weakened or degraded under the action of the preset pressure, thereby aggravating the performance difference between the structurally weakened portion of the second pole piece and other parts. The range of the preset pressure is that the crease of the pole piece to be detected can be further damaged, the pole piece to be detected is not broken, and the specific pressure value of the preset pressure can be different according to different specifications of the pole piece to be detected.
In the embodiment of the present application, the manner of applying pressure to the crease may be any manner in which pressure may be applied, such as plate pressing or roller pressing. Board pressing means that a preset pressure is applied to the second pole piece folded along the crease by a flat plate. The rolling is to apply preset pressure in a mode that the roller rolls on the second pole piece after being folded along the crease.
In this embodiment of the application, through applying preset pressure to the crease, the structure weakening degree of the structure weakening portion of the second pole piece that can aggravate to amplify the performance change of waiting to detect the pole piece around weakening, be favorable to more accurate determination waiting to detect the pliability of pole piece.
According to some embodiments of the present application, applying a preset pressure to the crease comprises: a rolling unit is driven to roll the folds at a preset speed.
Fig. 2 is a schematic view of a rolling device 200 according to some embodiments of the present application, and as shown in fig. 2, the rolling device 200 includes a rotating portion 220, a holding portion 230, a fixing portion 240, and a roller 250. In the embodiment of the present application, the rolling unit may be a roller 250. The axial length of the roller 250 may be set correspondingly according to the width of the pole piece 210 to be detected, for example, the axial length of the roller 250 is the same as the width of the pole piece 210 to be detected, but the embodiment of the present application is not limited thereto. The rotating part 220 serves as a rotating shaft of the roller 250, one side of the fixing part 240 is connected with the rotating part 220, the other side of the fixing part 240 is connected with the handheld part 230, an operator can operate the rolling device 200 through the handheld part 230 to roll the roller 250 on the crease surface of the pole piece 210 to be detected, and when the roller 250 rolls the crease at a preset speed due to the fact that the roller 250 has certain gravity, the roller 250 can apply pressure equal to the gravity of the roller 250 to the crease. In some embodiments, the roller 250 may also apply a preset pressure to the crease beyond its own weight by the hand piece 230 or other means.
In some embodiments, the number of roll folds 250 may be multiple.
In this embodiment of the application, through driving the roll-in unit to roll-in crease with predetermineeing the speed, can make the destruction force that the crease was applyed keep unanimously.
According to some embodiments of the present application, the travelling direction of the roll-in unit is perpendicular to the direction in which the folds extend.
In this application embodiment, through limiting the direction of travel of roll-in unit and the direction perpendicular that the crease extends, can further ensure the external force uniformity when the crease makes structural damage to improve the detection accuracy of this application embodiment.
Fig. 3 is a schematic diagram of a battery pole piece stretch-break detection device 300 according to some embodiments of the present application, fig. 4 is a schematic diagram of breaking of a battery pole piece according to some embodiments of the present application, and fig. 5 is a flowchart of a method for detecting tensile strength of a battery pole piece according to some embodiments of the present application. As shown in fig. 5, step S120 of the foregoing embodiment includes:
step S121, respectively applying a pulling force to the opposite ends of the first pole piece and the second pole piece until the first pole piece and the second pole piece are broken;
step S122, obtaining the maximum tension before the first pole piece breaks and taking the maximum tension as a first tension value, and obtaining the maximum tension before the second pole piece breaks and taking the maximum tension as a second tension value;
Step S123, determining a first tensile strength based on the first tension value; a second tensile strength is determined based on the second tension value.
In this embodiment, as shown in fig. 3, the battery pole piece breaking detection device 300 includes a fixture 310, a sensor 320, and a control box 330. The pole piece 210 to be detected may be either a first pole piece or a second pole piece. The two clamps 310 respectively clamp opposite ends of the pole piece 210 to be detected, the control box 330 can drive the clamps 310 to move at a constant speed, so that the pole piece 210 to be detected is stretched at a constant speed until the pole piece is broken, the stress and strain states of the pole piece 210 to be detected in the stretching process are detected in real time through the sensor 320, a stress-strain curve is formed, and the maximum tensile force of the pole piece 210 to be detected before fracture is obtained as a tensile force value. When the control box 330 drives the clamps 310 to move, only one of the clamps 310 can be driven to move, and the other clamp 310 is kept still; it is also possible to drive both clamps 310 in opposite directions simultaneously. In some examples, the direction of the tensile force applied to the pole piece 210 to be detected intersects with the extending direction of the crease on the second pole piece, so that when the stretch-break test is performed, the second pole piece is broken along the position where the crease is located first under the tensile force due to the weaker structural strength of the crease, so that the influence of the structural weakening portion on the tensile strength of the pole piece to be detected is more easily highlighted, and therefore the second tensile strength of the second pole piece can be detected and used for evaluating the flexibility of the pole piece 210 to be detected.
In this embodiment, when the tensile force applied by the battery pole piece stretch-break detection device 300 is greater than the tensile force limit bearable by the pole piece 210 to be detected, and the actual elongation of the pole piece 210 to be detected exceeds the elongation limit bearable by the pole piece 210 to be detected, the pole piece 210 to be detected breaks. As shown in fig. 4, when the pole piece 210 to be detected breaks, the first pole piece end 211 and the second pole piece end 212 of the pole piece 210 to be detected are not connected.
In this embodiment of the present application, the above-mentioned battery pole piece stretch-break detection device 300 may obtain the maximum tension before the first pole piece breaks and use the maximum tension as the first tension value, and obtain the maximum tension before the second pole piece breaks and use the maximum tension as the second tension value.
In the embodiment of the present application, the stress obtained by dividing the maximum tensile force value before breaking the pole piece 210 to be detected by the cross-sectional area of the pole piece 210 to be detected is the tensile strength. Determining a first tensile strength based on the first tension value of the first pole piece and the cross-sectional area of the first pole piece; the second tensile strength may be determined based on the same second tensile value of the second pole piece and the cross-sectional area of the second pole piece.
In the embodiment of the application, pulling force is respectively applied to the opposite ends of the first pole piece and the second pole piece until the first pole piece and the second pole piece are broken; obtaining the maximum tension before the first pole piece breaks and taking the maximum tension as a first tension value, and obtaining the maximum tension before the second pole piece breaks and taking the maximum tension as a second tension value; determining a first tensile strength based on the first tension value; the second tensile strength is determined based on the second tensile force value, so that the tensile strength of the pole piece to be detected can be detected efficiently and accurately, and the method has detection repeatability and reproducibility.
According to some embodiments of the present application, the structural weakening is a crease, and the direction of the tensile force applied to the pole piece to be detected is perpendicular to the direction in which the crease extends.
In this embodiment of the application, the structure weakening portion is the crease, through making the direction of the pulling force that is applied to the pole piece that waits to detect perpendicular with the direction that the crease extends, can make each position pulling force that is applied to the crease the same, can make the second pulling force of second pole piece more accurate to further improve the accuracy of waiting to detect the pliability of pole piece.
According to some embodiments of the present application, determining the flexibility of the pole piece to be detected based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece comprises: calculating the ratio of the first tensile strength to the second tensile strength; and determining the flexibility of the pole piece to be detected based on the ratio.
In this embodiment, the second pole piece has a structure weakening portion, so that the corresponding second tensile strength of the second pole piece is reduced to a certain extent compared with the first tensile strength of the first pole piece without the structure weakening portion, and if the flexibility of the pole piece to be detected is higher, the change of the tensile strength is smaller before and after the pole piece has the structure weakening portion. And for pole pieces to be detected with different flexibility, the degree of change of the tensile strength before and after the weakening treatment is different. Therefore, the ratio of the first tensile strength to the second tensile strength can be used as an index for quantitatively representing the flexibility of the pole piece to be detected, so that the flexibility of the pole piece to be detected can be represented more intuitively. In some embodiments, the flexibility of the pole piece to be inspected may be quantitatively characterized by taking the quotient of the second tensile strength divided by the first tensile strength. Since the second tensile strength is smaller than the first tensile strength, the quotient of the second tensile strength and the first tensile strength is a number smaller than 1, and the second tensile strength is positively correlated with the flexibility of the pole piece to be detected, namely, the better the flexibility is, the stronger the tensile strength holding capacity after the weakening treatment is, namely, the larger the second tensile strength of the corresponding second pole piece is, therefore, the quotient of the second tensile strength divided by the first tensile strength can be used for quantitatively representing the flexibility of the pole piece to be detected. In other embodiments, further data processing may be performed based on the second tensile strength and the first tensile strength, so as to more accurately characterize the flexibility of the pole piece to be detected, which is not further described herein.
Fig. 6 is a block diagram illustrating a device 600 for detecting flexibility of a battery pole piece according to some embodiments of the present application, and as shown in fig. 6, the device 600 for detecting flexibility of a battery pole piece includes a detecting unit 610 and a processing unit 620.
The detecting unit 610 is configured to obtain a tensile strength of a pole piece to be detected, where the pole piece to be detected includes a first pole piece and a second pole piece; the second pole piece has the same specification as the first pole piece, and the second pole piece has a structure weakening portion.
The processing unit 620 is configured to determine the flexibility of the pole piece to be detected based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece.
The detection unit 610 is configured to obtain tensile strengths of the first pole piece and the second pole piece, respectively. In one example, the detection unit 610 may obtain the tensile strength of the first pole piece and the second pole piece by directly detecting, for example, by performing a tensile strength test on the first pole piece and the second pole piece, respectively. In another example, the detection unit 610 may obtain the tensile strengths of both by means of direct acquisition, such as direct manual input or reading of the detected values from a storage medium.
In this embodiment of the present application, quantitative characterization of flexibility of the pole piece to be detected may be achieved through the detection unit 610 and the processing unit 620, and meanwhile, detection repeatability and reproducibility may also be improved.
Fig. 7 is a block diagram of another device 700 for detecting flexibility of a battery pole piece according to some embodiments of the present application, where the detecting unit 710 and the processing unit 720 may be the same as the detecting unit 610 and the processing unit 620 shown in fig. 6, and thus details are not repeated here. As shown in fig. 7, the detection device 700 further includes a weakening unit 730, where the weakening unit 730 is configured to weaken the second pole piece to form a structurally weakened portion.
In this embodiment of the application, the flexibility difference of the pole piece to be detected is amplified through the mode of weakening treatment to form the structure weakening portion, and this is because the tensile strength holding capacity of the pole piece to be detected of different specifications is different, and the tensile strength can appear the change of different degree around the structure weakening to make the flexibility of the pole piece to be detected have more obvious differentiation.
According to some embodiments of the present application, the weakening processing unit 730 comprises a folding unit 731, the folding unit 731 being for folding the second pole piece to form at least one crease serving as a structural weakening.
In the embodiment of the application, the second pole piece is weakened in a manner of folding the second pole piece to form at least one crease serving as the structural weakening portion, so that the weakening process is simple and quick and easy to realize.
According to some embodiments of the present application, the weakening unit 730 further comprises a rolling unit 732, the rolling unit 732 being adapted to roll the crease.
In the embodiment of the present application, the rolling unit 732 may be the rolling device 200 in the foregoing embodiment, and the rolling unit 732 may be the rolling roller 250 in the foregoing embodiment.
In the embodiment of the application, the structural weakening portion of the second pole piece obtained through weakening treatment is more obvious by applying the preset pressure to the crease, so that the flexibility of the determined pole piece to be detected is more accurate.
According to some embodiments of the present application, the rolling unit 732 is a roller, the width of which is greater than or equal to the maximum width of the pole piece to be detected, along a direction perpendicular to the travelling direction of the roller.
In the embodiment of the present application, the roller may be the roller 250 in the foregoing embodiment.
In this embodiment of the present application, along the advancing direction perpendicular to the roller, the width value of the pole piece to be detected may change, and at the same time, the width of the pole piece to be detected may also change in the rolling process. The width of running roller is greater than or equal to the maximum width of waiting to detect the pole piece, can ensure that the running roller is in the in-process that the fold is rolled in the fold, and the fold can be rolled in completely to further improve the detection accuracy of this application embodiment.
According to some embodiments of the present application, the weight of the roller is greater than or equal to 1 kg and less than or equal to 8 kg.
In the embodiment of the application, the roller can be made of metal materials, for example, a cylindrical structure made of stainless steel materials, different qualities can be set according to the types of battery pole pieces, the quality of the roller can be set to be more than or equal to 1 kg and less than or equal to 8 kg, the roller can be suitable for various types of pole pieces to be detected, and the applicability and the application range are greatly improved; meanwhile, the quality of the roller is limited, and the pole piece to be detected can be rolled by only depending on the self weight of the roller in practical application, so that the detection accuracy is improved, and inaccurate detection results caused by different applied acting forces can be avoided to a certain extent, so that the detection accuracy is further improved.
According to some embodiments of the present application, the detection device 700 further comprises a stretching unit 740, the stretching unit 740 being configured to apply a pulling force to opposite ends of the pole piece to be detected.
In this embodiment, the stretching unit 740 may be any tension applying device, and in some embodiments, the stretching unit 740 may be the battery pole piece stretch-break detecting device 300 in the foregoing embodiments. In some examples, the direction of the pulling force applied to the pole piece to be detected by the pulling unit 740 intersects the extending direction of the fold. In one example, the direction of the pulling force applied to the pole piece to be detected by the pulling unit 740 is perpendicular to the extending direction of the crease.
In this embodiment of the present application, the stretching unit 740 applies a tensile force to two ends of the pole piece to be detected, which is favorable for more accurately controlling the magnitude of the tensile force applied to the pole piece to be detected, and has detection repeatability and reproducibility.
Some embodiments of the present application also provide an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method for detecting the flexibility of the battery pole piece in the above embodiment.
Various implementations of the systems and techniques described above in this application can be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
Some embodiments of the present application further provide a computer readable storage medium storing a computer program, where the computer program when executed by a processor implements the method for detecting flexibility of a battery pole piece in the foregoing embodiments.
A computer readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The technical scheme of the application is further described through a specific embodiment. Fig. 8 is a flowchart of a method for detecting flexibility of a battery pole piece according to some embodiments of the present application, where, as shown in fig. 8, the method for detecting flexibility of a battery pole piece includes:
step S810: and cutting the battery pole pieces to obtain pole pieces to be detected with the same specification, wherein the pole pieces to be detected comprise a first pole piece and a second pole piece.
In the embodiment of the application, a plurality of pole pieces to be detected with the same length and width are obtained by cutting the same battery pole piece. The to-be-detected pole pieces are cut based on the same battery pole piece, and the specifications of the foil type, the foil thickness, the active substance components, the thickness, the compaction density and the like are the same. Dividing the pole piece to be detected into a first pole piece and a second pole piece.
Step S820: the second pole piece is weakened to form a structural weakening.
In this embodiment of the application, carry out the fifty percent discount with the second pole piece, form a crease at the middle part of second pole piece, further, can drive the running roller that width is greater than or equal to the maximum width of second pole piece and weight is greater than or equal to 1 kilogram and less than or equal to 8 kilograms, with the speed of predetermineeing along the direction perpendicular with the direction that the crease extends roll-in crease after the fifty percent discount. The width of running roller is greater than the length of crease, and the running roller can roll-in simultaneously to whole crease to guarantee the uniformity of crease roll-in, be favorable to improving the accuracy and the reproducibility that detect.
Step S830: and applying a pulling force to the opposite ends of the second pole piece until the second pole piece breaks.
In this embodiment, expand the second pole piece after folding, adopt battery pole piece stretch-break detection device, use two anchor clamps to centre gripping second pole piece's relative both ends respectively, apply the tensile force stretching second pole piece with the direction that the crease of second pole piece extends, at tensile in-process anchor clamps uniform motion to at the uniform velocity stretching second pole piece is no longer connected until the first pole piece end and the second pole piece end of second pole piece, and the second pole piece fracture.
Step S840: determining the second tensile strength f based on the maximum tensile force value before breaking the second pole piece b 。
In the embodiment of the application, the battery pole piece stretch-break detection device can record the stress-strain curve of the second pole piece in the stretching process in real time, and obtain the maximum tensile force before the second pole piece breaks as a tensile force value, and the stress obtained by dividing the maximum tensile force before the second pole piece breaks by the cross section area of the second pole piece is the second tensile strength f of the second pole piece b 。
Step S850: and applying a pulling force to the opposite ends of the first pole piece until the first pole piece breaks.
In this embodiment of the application, adopt battery pole piece stretch-break detection device, use two anchor clamps to centre gripping respectively the relative both ends of first pole piece, apply with the tensile first pole piece of the direction vertically that the crease of second pole piece extends, at tensile in-process anchor clamps uniform motion to at the first pole piece of uniform velocity tensile first pole piece no longer has the connection up to first pole piece end and second pole piece end of first pole piece, first pole piece fracture.
Step S860: determining a first tensile strength f based on a maximum tensile force before breaking of the first pole piece a 。
In the embodiment of the application, the battery pole piece stretch-break detection device can detect and form the stress-strain curve of the first pole piece in the stretching process in real time, and obtain the stress-strain curve before the first pole piece breaksThe maximum tensile force is taken as a tensile force value, and the stress obtained by dividing the maximum tensile force value before the first pole piece breaks by the cross section area of the first pole piece is the first tensile strength f of the first pole piece a 。
In the embodiment of the present application, steps S820 to S840 and steps S850 to S860 may be performed simultaneously; steps S820 to S840 may be performed first, and steps S850 to S860 may be performed later; steps S820 to S840 may also be performed after steps S850 to S860 are performed.
Step S870: based on the first tensile strength f a And a second tensile strength f b And determining the flexibility of the pole piece to be detected.
In the embodiment of the application, the first tensile strength f is calculated a And a second tensile strength f b And determining the flexibility of the pole piece to be detected based on the ratio. In some embodiments, a second tensile strength f may be taken b Divided by the first tensile strength f a Quotient f of (2) b /f a To quantitatively characterize the flexibility of the pole piece to be detected.
In some embodiments, the ternary positive electrode sheet is used as the to-be-detected electrode sheet for flexibility detection, wherein the compaction density (PD) of the to-be-detected electrode sheet in embodiment 1 is 3.3, the compaction density of the to-be-detected electrode sheet in embodiment 2 is 3.4, the compaction density of the to-be-detected electrode sheet in embodiment 3 is 3.5, the same weakening manner is adopted for the to-be-detected electrode sheets in embodiments 1-3, and each embodiment is separately detected three times to obtain the first tensile strength f of the first electrode sheet in the three groups of to-be-detected electrode sheets a And a second tensile strength f of the second pole piece b And respectively calculating the flexibility (f) of the group of pole pieces to be detected b /f a ) The specific detection results are as follows:
in the present example, the coefficient of variation (Coefficient of Variation, COV) represents the detected fluctuation of the range of values. Examples 1-3 Battery poles according to the present application, as shown in the above TableThe detection results COV obtained by the detection method of the flexibility of the sheet are all smaller than 0.002, which shows that the detection method of the flexibility provided by some embodiments of the application has stable results and strong reproducibility. Meanwhile, according to the test method in the embodiment, each embodiment respectively takes the second tensile strength f of the pole piece to be detected b Divided by the first tensile strength f a Quotient f of (2) b /f a To quantitatively characterize the flexibility of the pole piece to be detected, the flexibility (f) of the ternary positive pole piece detected in examples 1-3 b /f a ) The results show that: PD-3.3>PD-3.4>PD-3.5. It will be appreciated that the greater the compacted density of the pole piece, the greater the stiffness of the pole piece and the less flexible the pole piece. Therefore, the detection result shows that the flexibility of the pole piece gradually decreases along with the increase of the compaction density of the pole piece, and accords with the change trend of the flexibility and the compaction density of the pole piece, so that the flexibility detection method provided by the application is higher in accuracy.
In some embodiments, the graphite negative electrode sheet is used as the electrode sheet to be detected for flexibility detection, wherein the compaction density of the electrode sheet to be detected in embodiment 4 is 1.45, the compaction density of the electrode sheet to be detected in embodiment 5 is 1.55, the compaction density of the electrode sheet to be detected in embodiment 6 is 1.65, the same weakening treatment mode is adopted for the electrode sheets to be detected in embodiments 1-3, and the electrode sheets to be detected in each embodiment are respectively detected three times to obtain the first tensile strength f of the first electrode sheet in the three groups of electrode sheets to be detected a And a second tensile strength f of the second pole piece b And respectively calculating the flexibility (f) of the group of pole pieces to be detected b /f a ) The specific detection results are as follows:
as shown in the table above, the COV of the detection results obtained by the detection method of the flexibility of the battery pole piece in examples 4-6 according to the application also satisfies less than 0.002, and the detection results are proved to be stable. Examples 4-6 flexibility (f) of graphite negative electrode sheets of different compacted densities b /f a ) The size relation is as follows: PD-1.45>PD-1.55>PD-1.65 accords with the change trend of flexibility and compaction density of the pole piece. According to the embodiment, the detection method for the flexibility of the battery pole piece can be suitable for various battery pole pieces, and the reproducibility and the accuracy of the detection method are high.
In the embodiment of the application, the first tensile strength of the first pole piece and the second tensile strength of the second pole piece are obtained on the basis through the first pole piece and the second pole piece with the same specification, the flexibility difference of the pole pieces to be detected is amplified through the structural weakening treatment mode, and the tensile strength holding capacities of different pole pieces to be detected are obviously differentiated, so that the flexibility of the pole pieces to be detected is more obviously differentiated; meanwhile, the flexibility of the pole piece to be detected is determined based on the first tensile strength of the first pole piece and the second tensile strength of the second pole piece, so that the quantitative characterization of the flexibility of the battery pole piece can be realized; in addition, the detection method of the flexibility of the battery pole piece is easy to operate, and can improve the detection repeatability and reproducibility.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (14)
1. The method for detecting the flexibility of the battery pole piece is characterized by comprising the following steps of:
obtaining a plurality of pole pieces to be detected, wherein the pole pieces to be detected at least comprise a first pole piece and a second pole piece with the same specification; wherein the second pole piece comprises a structural weakening; the structural weakening part is a crease;
Obtaining the first tensile strength of the first pole piece and the second tensile strength of the second pole piece includes: respectively applying pulling force to the opposite ends of the first pole piece and the second pole piece until the first pole piece and the second pole piece are broken, wherein the direction of the pulling force applied to the pole piece to be detected is perpendicular to the extending direction of the crease,
obtaining the maximum tension before the first pole piece breaks and taking the maximum tension as a first tension value, obtaining the maximum tension before the second pole piece breaks and taking the maximum tension as a second tension value, and determining the first tensile strength based on the first tension value; determining the second tensile strength based on the second tension value;
and determining the flexibility of the pole piece to be detected based on the ratio of the first tensile strength of the first pole piece to the second tensile strength of the second pole piece.
2. The method according to claim 1, wherein the obtaining a plurality of pole pieces to be detected includes at least a first pole piece and a second pole piece with the same specification; wherein the second pole piece includes a structural weakening comprising:
cutting the same battery pole piece to obtain a plurality of pole pieces to be detected with the same specification;
And weakening at least one pole piece to be detected to form the structure weakening part, taking the pole piece to be detected which is not subjected to weakening as the first pole piece, and taking the pole piece to be detected which is subjected to weakening as the second pole piece.
3. The method of detection according to claim 2, wherein the weakening comprises:
the second pole piece is folded to form at least one crease that acts as the structural weakness.
4. A method of detecting according to claim 3, wherein the weakening further comprises:
applying a preset pressure to the crease.
5. The method of detecting according to claim 4, wherein said applying a preset pressure to said crease comprises:
and driving a rolling unit to roll the crease at a preset speed.
6. The detection method according to claim 5, wherein a traveling direction of the roll pressing unit is perpendicular to a direction in which the crease extends.
7. The utility model provides a detection device of battery pole piece pliability which characterized in that includes:
a stretching unit configured to apply a pulling force to opposite ends of a pole piece to be detected, the pole piece to be detected including a first pole piece and a second pole piece, the second pole piece being identical in specification to the first pole piece, and the second pole piece including a structural weakening portion; the structural weakening part is a crease; the direction of the tensile force applied to the pole piece to be detected is perpendicular to the extending direction of the crease;
The detection unit is configured to acquire the maximum tension before the first pole piece breaks and serve as a first tension value, acquire the maximum tension before the second pole piece breaks and serve as a second tension value, and determine the first tensile strength of the first pole piece based on the first tension value; determining a second tensile strength of the second pole piece based on the second tension value;
and a processing unit configured to determine flexibility of the pole piece to be detected based on a ratio of a first tensile strength of the first pole piece and a second tensile strength of the second pole piece.
8. The detection apparatus according to claim 7, characterized in that the detection apparatus further comprises:
and a weakening unit configured to weaken the second pole piece to form the structurally weakened portion.
9. The detection apparatus according to claim 8, wherein the weakening unit comprises:
a folding unit configured to fold the second pole piece to form at least one crease that acts as a structural weakening.
10. The detection device of claim 9, wherein the weakening unit further comprises:
and a rolling unit configured to roll the crease.
11. The apparatus according to claim 10, wherein the rolling unit is a roller,
and the width of the roller is larger than or equal to the maximum width of the pole piece to be detected along the direction perpendicular to the travelling direction of the roller.
12. The detection device of claim 11, wherein the roller weighs greater than or equal to 1 kilogram and less than or equal to 8 kilograms.
13. An electronic device, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the detection method of any one of claims 1-6.
14. A computer readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the detection method of any one of claims 1 to 6.
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| CN202310468130.7A CN116183380B (en) | 2023-04-27 | 2023-04-27 | Method, device, equipment and medium for detecting flexibility of battery pole piece |
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