CN115360404A - Adhesive structure and battery cell detection method - Google Patents

Adhesive structure and battery cell detection method Download PDF

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Publication number
CN115360404A
CN115360404A CN202211270802.5A CN202211270802A CN115360404A CN 115360404 A CN115360404 A CN 115360404A CN 202211270802 A CN202211270802 A CN 202211270802A CN 115360404 A CN115360404 A CN 115360404A
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recognition
adhesive
processed
pole piece
workpiece
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CN115360404B (en
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王欣
梁静爽
李博
武新战
滕国鹏
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Jiangsu Contemporary Amperex Technology Ltd
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Jiangsu Contemporary Amperex Technology Ltd
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Priority to CN202310289821.0A priority Critical patent/CN117913339A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/005—Devices for making primary cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Biochemistry (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The application relates to a glue structure and a battery cell detection method, in the technical field of battery cell production, glue is adhered to a crack on a workpiece to be processed, and the problem that the product preparation is interrupted due to belt breakage of the workpiece to be processed when the workpiece passes through a roller is avoided. Because the colloid is provided with the recognition body, and the density of the recognition body is greater than that of the to-be-processed piece, when the nondestructive testing technology is used for eliminating a defective cell, the recognition body has a higher absorption coefficient to rays than the to-be-processed piece, for example, the recognition body can absorb X rays more easily than the to-be-processed piece, and the recognition body can present a brighter image in the nondestructive testing technology, so that the adhesive structure can be accurately and quickly recognized in the testing process. So, under the prerequisite that the work piece can be stabilized the roller is treated in guaranteeing disconnected area, in time discernment defect electricity core effectively reduces the unnecessary loss, promotes the precision and the efficiency that detect.

Description

Adhesive structure and battery cell detection method
Technical Field
The application relates to the technical field of battery cell production, in particular to an adhesive structure and a battery cell detection method.
Background
In the preparation process of the battery core, the pole piece has the possibility of being broken. For this reason, the broken tape pole pieces are usually connected by yellow glue to ensure that the pole pieces are stably and continuously passed through the roll.
And for the battery cell adhered with the yellow glue as a defective battery cell, the battery cell needs to be removed by a nondestructive testing technology in the subsequent preparation process. However, in the detection process, the defects cannot be identified timely and effectively, so that the battery cell with the yellow glue easily flows into the post-process and then flows into the client, and customer complaints are caused.
Disclosure of Invention
Therefore, the adhesive structure and the battery cell detection method are needed to be provided, defects can be timely and effectively identified on the premise that the workpiece to be processed can stably pass through the roller, and unnecessary loss is effectively reduced.
In a first aspect, the present application provides an adhesive construct comprising: the colloid is used for being stuck at the crack of the workpiece to be machined; a recognition entity immobilized on the colloid, the recognition entity configured to: the density of the recognition object is greater than the density of the work piece to be processed.
The adhesive structure is used for adhering the adhesive to the crack of the workpiece to be processed, so that the phenomenon that the production of the product is interrupted due to belt breakage of the workpiece to be processed when the workpiece passes through the roller is avoided. Because the colloid is provided with the recognition body, and the density of the recognition body is greater than that of the to-be-processed piece, when the nondestructive testing technology rejects the electric core with the defect, the recognition body has a higher absorption coefficient of the radiation than the to-be-processed piece, for example, the recognition body can more easily absorb X rays and the like than the to-be-processed piece, and the recognition body can present a brighter image in the nondestructive testing technology, so that the colloid bonding structure can be accurately and quickly identified in the testing process. So, under the prerequisite that the work piece can stabilize the roller is treated in the assurance disconnected area, in time discernment defect electricity core effectively reduces the unnecessary loss, promotes the precision and the efficiency that detect.
In some embodiments, the density of the recognition entity is designated A, wherein 3.5 g/cm 3 ≤A≤8.92 g/cm 3 . Thus, the density A value of the recognition body is reasonably controlled, and the tool between the recognition body and the workpiece to be processed can be ensuredHas obvious developing identification degree and can avoid the influence of the overweight of the adhesive structure on the service performance.
In some embodiments, the recognition object is a wire. Therefore, the recognition body is designed into an iron wire, the developing recognition degree is improved, and the recognition body is conveniently arranged on the colloid and is beneficial to forming of an adhesive structure.
In some embodiments, the glue body is stuck to the crack along the first direction; wherein the first direction is consistent with the width direction of the workpiece to be processed. Therefore, the glue body is adhered to the crack along the first direction, the phenomenon that the to-be-processed piece is broken due to the fact that the to-be-processed piece is prone to continuing to break from the crack is avoided, the to-be-processed piece is guaranteed to keep a complete structure, and the continuous product preparation process is maintained.
In some embodiments, the recognition objects are disposed on the colloid to extend in the first direction. So, extend the setting along first direction with the recognition body on the colloid, like this when the colloid pastes in crack department, the recognition body then appears and arranges along the width direction of treating the machined part for the development image of recognition body is more directly perceived, obvious, improves the development degree of discerning of defect.
In some embodiments, the extended length of the recognition object is recorded as L, and the width of the workpiece to be processed is recorded as W, wherein L is more than or equal to 1/2W and less than or equal to W. Therefore, the extension length L value of the recognition body is reasonably controlled, so that the recognition body and the workpiece to be processed can have obvious developing recognition degree, and the phenomenon that the recognition body is too long and easily extends out of the rubber body to cause the workpiece to be processed to be scratched and the like can be avoided.
In some embodiments, the cross-sectional area of the identifier in a direction perpendicular to the first direction is denoted as S, wherein 0.0314mm 2 ≤S≤0.196mm 2 . Therefore, the cross section area S value of the recognition body is reasonably controlled, so that the obvious developing recognition degree between the recognition body and the workpiece to be processed can be ensured, and the phenomenon that the recognition body is too thick and the gluing operation becomes very difficult can be avoided.
In some embodiments, the adhesive structure further comprises a fixing portion extending along the second direction and used for being stuck at the crack; wherein the second direction intersects the first direction. So, will paste the fixed part that extends along the second direction in crack department for the adhesive strength of crack department obtains further promotion, guarantees that the preparation of product is stable, continuously goes on.
In some embodiments, the fixing portion is connected to the sealant, and at least one end of the fixing portion extends out of the sealant along the second direction. So, stretch out the fixed part outside the colloid along the at least one end of second direction for fixed part one end can paste on treating the machined part, so that realize transverse seal to the colloid, improve the colloid and treat the bonding strength between the machined part.
In some embodiments, the number of the fixing portions is at least two, and all the fixing portions are connected to the adhesive body at intervals along the first direction. So, connect at least two fixed part intervals on the colloid, be favorable to promoting the colloid and treat the bonding strength between the machined part.
In some embodiments, the adhesive body includes a main body layer and a protective layer attached to the main body layer, the recognition body is disposed between the main body layer and the protective layer, and a side of the main body layer opposite to the protective layer is used for being attached to the crack. So, design the colloid into bilayer structure for the discernment body is located between main part layer and the inoxidizing coating, can make the discernment body stably fix on the colloid, can avoid the discernment body directly to expose outside again and easy scratch treats the machined part.
In a second aspect, the present application provides a battery cell detection method, including the following steps: acquiring image information of a pole piece in a battery cell in a scanning mode; and judging whether an identifier exists on the pole piece according to the brightness of the image information, wherein the identifier is in the gluing structure of any scheme.
In the cell detection method, in the cell detection process, the nondestructive detection technology is utilized to scan the pole piece in the cell to obtain the image information on the pole piece; judging whether the identification body exists on the pole piece or not according to the brightness in the image information; if the identifier exists, the cell is a defective cell. So, through the judgement to the recognition body, judge whether electric core possesses the defect for the defect identification of electric core is more convenient, effectively reduces the unnecessary loss, promotes the precision and the efficiency of detection.
In some embodiments, the determining whether a recognition object exists on the pole piece according to the brightness of the image information, wherein the density of the recognition object is greater than the density of the pole piece includes: and if the brightness of at least one position on the image information is higher than the image brightness corresponding to the pole piece, judging that the identifier exists on the pole piece. When the battery cell is judged to be a defective product, if the brightness of at least one position on the image information is higher than the image brightness corresponding to the pole piece, the fact that the identification body exists on the pole piece is indicated. So, the defect identification of electric core is more convenient, promotes the precision and the efficiency that detect.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
fig. 1 is a schematic view of a gluing structure and a cell matching structure according to some embodiments of the present disclosure;
fig. 2 is a schematic diagram of cell development as described in some embodiments of the present application;
FIG. 3 is a diagram illustrating the structural coordination of the gel and the recognition object according to some embodiments of the present disclosure;
fig. 4 is a flowchart of a cell detection method in some embodiments of the present application.
100. Gluing structure; 110. colloid; 111. a body layer; 112. a protective layer; 120. an identifier; 130. a fixed part; 200. a workpiece to be processed; 210. pole pieces; x, a first direction; y, a second direction.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and therefore are only used as examples, and the protection scope of the present application is not limited thereby.
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 "including" and "having," and any variations thereof in the description and claims of this application and 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", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in 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 pieces" refers to two or more (including two).
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanded.
For the sake of understanding, the applicant takes the preparation of the battery cell as an example, but the preparation is not to be construed as a limitation to the present application, wherein the workpiece to be processed may be a pole piece.
The applicant notices that in the preparation process of the battery cell, no matter in the coating or rolling process, the pole piece is taken as a complete structure and is conveyed through the conveying roller structure, so that the preparation process can be continuously operated. If the pole piece is broken, the pole piece can not be conveyed continuously by the conveying roller, so that the subsequent processes can not be carried out orderly.
Therefore, when the pole piece is broken, yellow glue is usually adhered to the crack of the pole piece, so that the pole piece is prevented from being broken, and the pole piece can continuously and effectively pass through the roller. However, when the electrode sheet adhered with the yellow glue is prepared into the battery cell, the electrode sheet needs to be removed in time in the subsequent process, so as to prevent the battery cell with defects from flowing into the client and causing customer complaints.
Currently, the finished product battery cores which are rejected at risk generally adopt a nondestructive testing technology, such as: and (3) acquiring an image inside the battery cell by using a Computed Tomography (CT) technology and judging whether the battery cell has yellow glue or not according to the development identification degree. However, in the detection process, the image brightness of the yellow glue is often lower than that of the pole piece, so that the obtained image development identification degree is not obvious, misjudgment is easy to occur, and the battery core with the yellow glue is easy to flow into the client.
Based on this, in order to solve the problem caused by the insufficient developing identification degree and the failure to accurately and quickly identify the defective cell in the prior art, the applicant has designed an adhesive structure through intensive research, wherein the identification body is fixed on the adhesive body and configured as follows: the density of the recognition body is greater than that of the pole piece.
In the process of preparing the battery cell, the colloid is adhered to the crack on the pole piece, so that the phenomenon that the battery cell preparation is interrupted due to the fact that the pole piece is broken when passing through a roller is avoided. Because the colloid is provided with the recognition body, and the density of the recognition body is greater than that of the pole piece, when the cell with the defect is rejected by the nondestructive testing technology, the recognition body has a higher absorption coefficient to rays than the pole piece, for example, the recognition body can absorb X rays more easily than the pole piece, and the recognition body can present brighter images in the nondestructive testing technology, so that the adhesive structure can be accurately and quickly recognized in the detection process. So, under the prerequisite that the roller can be stabilized to the pole piece of guaranteeing to take absolutely, in time discernment defect electricity core effectively reduces the unnecessary loss, promotes the precision and the efficiency that detect.
The application provides a glue structure can not only be applicable to the preparation in-process of electric core, still can be suitable for in the preparation process that needs the bonding to avoid disconnected area at other products. The cell refers to the smallest unit constituting the battery, and includes an end cap, a case, an electrode assembly, and other functional components. The electrode assembly is a component of the cell in which electrochemical reactions occur. One or more electrode assemblies may be contained within the housing. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively.
Referring to fig. 1, according to some embodiments of the present application, an adhesive construct 100 is provided. The adhesive structure 100 includes: the colloid 110 and the recognition body 120. The adhesive 110 is used for adhering to the crack of the workpiece 200 to be processed. The recognition object 120 is fixed on the colloid 110, and the recognition object 120 is configured to: the density of the recognition object 120 is greater than the density of the member to be processed 200.
The colloid 110 refers to an object having a binding function, such as: adhesive tapes, and the like. The colloid 110 is adhered to the crack of the workpiece 200, so that the workpiece 200 keeps a complete structure, and the phenomenon that the strip is broken and cannot continuously pass through the roller is avoided. The term "roll-passing" means that the workpiece 200 to be processed is conveyed by the rotation of the conveying rolls, and if the workpiece 200 to be processed is broken, one broken section can be conveyed continuously under the action of the conveying rolls, while the other section loses the action of the conveying rolls and cannot pass through the conveying rolls continuously.
The member to be processed 200 refers to a structure conveyed by a conveying roller in the product preparation process, such as: in the cell preparation process, the to-be-processed member 200 is a pole piece 210.
The recognition entity 120 refers to a structure that can be developed in a non-destructive inspection technique, such as: the recognition object 120 may be a metal body, a plastic body, or the like. The nondestructive testing technique may be Computed Tomography (CT), and when the CT nondestructive testing technique tests the internal structure of the product, the attenuation coefficient of the X-ray is directly related to the density of the tested substance, and the higher the density is, the brighter the display area is. Therefore, referring to fig. 2, the density of the recognition object 120 is controlled to be greater than the density of the workpiece 200, so that the image brightness of the recognition object 120 is higher than the brightness of the workpiece 200, thereby improving the development identification of the CT image.
The recognition object 120 can be fixed on the gel 110 in various ways, such as: the recognition body 120 can be fixed on the colloid 110 by, but not limited to, bonding, wrapping, sewing, and fastening.
The density of the recognition body 120 is designed to be greater than that of the workpiece 200 to be processed, so that the recognition body 120 can present a brighter image in the nondestructive testing technology, and the adhesive structure 100 can be accurately and rapidly identified in the testing process. So, treat under the prerequisite that machined part 200 can stabilize the roller guaranteeing, in time, effectively discern the defect, effectively reduce the unnecessary loss, promote the precision and the efficiency that detect.
According to some embodiments of the present application, optionally, the density of the recognition entity 120 is denoted as a, where 3.5 g/cm 3 ≤A≤8.92 g/cm 3 。
When the density of the recognition body 120 is controlled too low, the brightness of the image obtained by the recognition body 120 in the non-destructive inspection technology is much lower than that of the workpiece 200 to be processed, so that the shadow region of the adhesive structure 100 is easily confused with other shadow regions on the workpiece 200 during identification, and whether the product has defects cannot be accurately judged; when the density control of the recognition member 120 is large, the adhesive structure 100 may be heavy as a whole, and the use of the adhesive structure 100 may be seriously affected.
For ease of understanding, taking the cell preparation as an example, the density of the pole piece 210 is generally 3.42g/cm 3 Thus, the density of the recognition material 120 is controlled to 3.5 g/cm 3 ~8.92 g/cm 3 The image brightness of the recognition object 120 is higher than that of the pole piece 210, so that the recognition object can be easily recognized。
The density A of the recognition entity 120 may be 3.5 g/cm 3 ~8.92 g/cm 3 Any of the values, such as: the density A may be, but is not limited to, 3.5 g/cm 3 、4 g/cm 3 、4.5 g/cm 3 、5 g/cm 3 、5.5 g/cm 3 、6 g/cm 3 、6.5 g/cm 3 、7 g/cm 3 、7.5 g/cm 3 、7.8 g/cm 3 、8 g/cm 3 、8.5 g/cm 3 、8.92 g/cm 3 And the like.
The density A value of the recognition body 120 is reasonably controlled, so that the recognition body 120 and the workpiece 200 to be processed have obvious developing recognition degree, and the condition that the adhesive structure 100 is too heavy to influence the service performance can be avoided.
According to some embodiments of the present application, optionally, referring to fig. 1, the identifier 120 is an iron wire.
The density of the iron wire is generally 7.8 g/cm 3 It can form a significant development recognition with most of the workpieces 200 to be processed, such as: when waiting that machined part 200 is pole piece 210, can acquire brighter image by the iron wire in the nondestructive test, guarantee that the measurement personnel can judge fast, accurately. Meanwhile, the iron wires are easy to arrange on the colloid 110, and the space occupied by the iron wires on the colloid 110 can be reduced.
The recognition body 120 is designed as an iron wire, which not only improves the development recognition degree, but also facilitates the arrangement on the colloid 110, thereby facilitating the formation of the adhesive structure 100.
According to some embodiments of the present application, referring to fig. 1, the glue 110 is adhered to the crack along a first direction X; wherein the first direction X coincides with the width direction of the workpiece 200 to be processed.
If a crack occurs in the work 200 in the width direction of the work, the strip breakage is likely to occur. Therefore, the adhesive bonding means 100 is required for the crack extending in the width direction of the workpiece.
The colloid 110 is adhered to the crack along the first direction X, so that the phenomenon of strip breakage caused by continuous fracture of the workpiece 200 to be processed is avoided, the workpiece 200 to be processed is ensured to keep a complete structure, and the continuous product preparation process is maintained.
According to some embodiments of the present application, optionally, referring to fig. 1, the recognition object 120 is disposed on the colloid 110 to extend along the first direction X.
The recognition object 120 extends along the first direction X on the colloid 110, and the extension may be linear extension; it may also extend as a curve, but the overall trend is in the first direction X.
The recognition objects 120 are arranged on the gel 110 in various ways, such as: the recognition objects 120 are only concentrated in the middle of the colloid 110; or concentrated on one end of the gel 110; of course, it may extend from one end of the gel 110 to the other, etc.
The recognition bodies 120 are arranged on the colloid 110 in an extending manner along the first direction X, so that when the colloid 110 is stuck at a crack, the recognition bodies 120 are arranged along the width direction of the workpiece 200 to be processed, the developed images of the recognition bodies 120 are more visual and obvious, and the developed recognition degree of the defects is improved.
According to some embodiments of the present application, optionally, referring to fig. 1, the extension length of the recognition object 120 is denoted as L, and the width of the workpiece 200 to be processed is denoted as W, wherein 1/2W ≦ L ≦ W.
When the length of the recognition body 120 is designed to be too short, the image acquired by the recognition body 120 in the nondestructive testing technology is not obvious under the image contrast of the workpiece 200 to be processed, so that the misjudgment probability is high; when the length of the recognition body 120 is too long, the recognition body can easily extend out of the colloid 110, and scratch or structural interference is caused on the workpiece 200 to be processed; at the same time, material waste may also result.
The extension length L of the recognition member 120 is reasonably controlled, so that the recognition member 120 and the workpiece 200 can be clearly recognized, and the workpiece 200 can be prevented from being scratched due to the recognition member 120 being too long and easily extending out of the colloid 110.
According to some embodiments of the present application, referring to fig. 1, optionally, a cross-sectional area of the recognition object 120 perpendicular to the first direction X is denoted as S, wherein 0.0314mm 2 ≤S≤0.196mm 2 。
The cross-sectional shape of the recognition entity 120 can be designed in various ways, such as: the cross-sectional shape of the recognition object 120 may be, but is not limited to, circular, elliptical, triangular, quadrilateral, pentagonal, etc. When the cross-sectional shape of the recognition object 120 is circular, the diameter of the recognition object 120 may be 0.2mm to 0.5mm.
The size of the cross-sectional area of the recognition member 120 can determine the thickness of the recognition member 120, and if the cross-sectional area of the recognition member 120 is too large, the recognition member 120 is thick, so that the obtained adhesive structure 100 becomes very heavy, and the adhesive operation becomes very difficult. If the cross-sectional area of the recognition object 120 is too small, the development brightness of the recognition object 120 becomes very narrow, and is difficult to distinguish from the development brightness of the workpiece 200, resulting in difficulty in defect recognition.
The cross-sectional area S of the recognition object 120 may be 0.0314mm 2 ~0.196mm 2 Any of the values, such as: the extension length L may have a value of, but is not limited to, 0.0314mm 2 、0.040mm 2 、0.05mm 2 、0.06mm 2 、0.07mm 2 、0.08mm 2 、0.09mm 2 、0.1mm 2 、0.15mm 2 、0.196mm 2 And so on.
The cross-sectional area S of the recognition body 120 is reasonably controlled, so as to ensure a clear developing recognition between the recognition body 120 and the workpiece 200, and avoid the recognition body 120 from being too thick, which makes the gluing operation very difficult.
According to some embodiments of the present application, optionally, referring to fig. 1, the adhesive structure 100 further includes a fixing portion 130. The fixing portion 130 extends along the second direction Y and is used to be adhered to the crack. Wherein the second direction Y intersects the first direction X.
The fixing portion 130 is adhered to the crack in a manner extending in the second direction Y, and intersects with the colloid 110. Of course, in some embodiments, the first direction X is perpendicular to the second direction Y, that is, the extending direction of the fixing portion 130 adhered to the crack is perpendicular to the extending direction of the adhesive 110 adhered to the crack.
The fixing portion 130 can be connected to the adhesive 110 when being stuck to the crack; or not connected to the glue 110, that is, the fixing portion 130 is adhered to the crack at a distance from the glue 110. When the fixing portion 130 is connected to the molding compound 110, the fixing portion 130 and the molding compound 110 may be connected by, but not limited to, bonding, sewing, integral molding, etc. Wherein, the integrated forming mode can be tailor, cutting and the like.
The fixing portion 130 extending along the second direction Y is adhered to the crack, so that the adhesive strength of the crack is further improved, and the product is stably and continuously prepared.
According to some embodiments of the present application, optionally, referring to fig. 1, the fixing portion 130 is connected to the molding compound 110, and at least one end of the fixing portion 130 extends out of the molding compound 110 along the second direction Y.
In the process of adhering, after the glue body 110 is adhered to the crack in the first direction X, the fixing portion 130 is adhered to a side surface of the glue body 110 opposite to the crack in the second direction Y, and at least one end of the fixing portion 130 extends out of the glue body 110, and the extended portion is adhered to the workpiece 200. Of course, the adhering manner of the adhering structure 100 is various and is limited to the above solutions, such as: the fixing portion 130 and the colloid 110 may also be pre-connected into an integral structure, and then the integral structure is adhered to the crack; alternatively, the fixing portion 130 is first attached to the crack, and then the adhesive 110 is attached to the crack.
The structural state of the fixing portion 130 on the colloid 110 may be: one end of the fixing portion 130 along the second direction Y extends out of the colloid 110; alternatively, two opposite ends of the fixing portion 130 along the second direction Y respectively extend out of the colloid 110.
At least one end of the fixing portion 130 extends out of the adhesive body 110 along the second direction Y, so that one end of the fixing portion 130 can be adhered to the workpiece 200, thereby implementing transverse sealing on the adhesive body 110 and improving the adhesive strength between the adhesive body 110 and the workpiece 200.
According to some embodiments of the present application, optionally, please refer to fig. 1, the number of the fixing portions 130 is at least two. All the fixing portions 130 are connected to the colloid 110 at intervals along the first direction X.
The number of the fixing portions 130 may be two, three, four, or more. The spacing of the fixing portions 130 in the first direction X may be determined according to the actual size of the encapsulant 110. In some embodiments, the number of the fixing portions 130 is two. The two fixing portions 130 are respectively and correspondingly connected to two opposite ends of the colloid 110 along the first direction X, so that the end portion of the colloid 110 is sealed, and one end of the colloid 110 is prevented from being warped.
The at least two fixing portions 130 are connected to the adhesive 110 at intervals, which is beneficial to improving the bonding strength between the adhesive 110 and the workpiece 200 to be processed.
According to some embodiments of the present application, referring to fig. 3, the colloid 110 includes a main body layer 111 and a protective layer 112 attached to the main body layer 111. The recognition element 120 is disposed between the body layer 111 and the shield layer 112. The side of the main layer 111 facing away from the protective layer 112 is used for adhering to the crack.
The main body layer 111 and the protective layer 112 may be connected by an adhesive method, a sewing method, an integral molding method, or the like. The main body layer 111 and the protective layer 112 are connected to form a double-layer structure, so that the recognition body 120 can be stably fixed on the colloid 110, and the recognition body 120 can be prevented from being directly exposed to scratch the workpiece 200.
The glue body 110 is designed to be a double-layer structure, so that the recognition object 120 is located between the main body layer 111 and the protective layer 112, which not only can stably fix the recognition object 120 on the glue body 110, but also can prevent the recognition object 120 from being directly exposed to scratch the workpiece 200.
According to some embodiments of the present application, please refer to fig. 4, the present application provides a cell detection method, including the following steps:
s100, acquiring image information of a pole piece 210 in the battery cell in a scanning mode;
s200, determining whether the recognition object 120 is present on the pole piece 210 according to the brightness of the image information, wherein the recognition object 120 is the recognition object 120 in the adhesive structure 100 according to any of the above embodiments.
The cell refers to the smallest unit constituting the battery. The battery cell comprises an electrode assembly, wherein the electrode assembly is a component of the battery cell in which electrochemical reaction occurs, and the electrode assembly is formed by mutually laminating or winding positive and negative pole pieces 210 and a diaphragm.
The scanning mode refers to scanning the internal structure of the battery cell by a nondestructive testing technology, for example: and the inside of the battery cell is scanned by X rays through CT, and the like. The image information acquired by the scanning method includes the brightness of the image, the shape of the image, and the like.
The identifier 120 is the identifier 120 in the adhesive structure 100 according to any one of the above embodiments, and means: the density of the recognition object 120 is greater than that of the pole piece 210, and in a non-destructive inspection technology, such as a CT technology, the image brightness of the recognition object 120 is brighter than that of the pole piece 210.
In the cell detection method, in the cell detection process, the pole piece 210 in the cell is scanned by using a nondestructive detection technology to obtain image information on the pole piece 210; judging whether the recognition object 120 exists on the pole piece 210 according to the brightness in the image information; if the identifier 120 exists, the cell is a defective cell. So, through the judgement to discernment body 120, judge whether electric core possesses the defect for the defect identification of electric core is more convenient, effectively reduces the unnecessary loss, promotes the precision and the efficiency of detection.
According to some embodiments of the present application, optionally, in S200, according to the brightness of the image information, determining whether the recognition object 120 exists on the pole piece 210, where the step of determining that the density of the recognition object 120 is greater than the density of the pole piece 210 includes: if the brightness of at least one position on the image information is higher than the brightness of the image corresponding to the pole piece 210, it is determined that the recognition object 120 exists on the pole piece 210.
If there is at least one location on the image information with a brightness higher than the brightness of the image corresponding to the pole piece 210, it means that there is an object with a density higher than that of the pole piece 210 on the pole piece 210, that is, the recognition object 120. Of course, if there is no image information with a brightness higher than the image brightness corresponding to the pole piece 210, that is, the image brightness corresponding to the pole piece 210 is the highest, it indicates that the identification body 120 does not exist in the pole piece 210, and the cell is good.
When it is determined whether the battery cell is a defective product, if the brightness of at least one location on the image information is higher than the brightness of the image corresponding to the pole piece 210, it indicates that the identifier 120 exists on the pole piece 210. So, make the defect recognition of electric core more convenient, promote the precision and the efficiency that detect.
According to some embodiments of the present application, please refer to fig. 1 to fig. 3, the present application provides a structure for improving yellow glue and improving the recognition degree of CT detection involved in the yellow glue of the battery core, and a metal Fe wire with high relative density is added in the colloid 110, so that in the CT detection process, when an X-ray passes through the colloid 110 involved in the battery core, the development of the Fe wire wrapped inside is brighter and more obvious, which is convenient for better recognizing the risk.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions 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, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (13)

1. An adhesive construction (100) comprising:
the colloid (110) is used for being stuck at the crack of the workpiece (200) to be processed;
a recognition entity (120) fixed on the colloid (110), the recognition entity (120) configured to: the density of the recognition object (120) is greater than the density of the workpiece (200) to be processed.
2. The adhesive structure (100) of claim 1, wherein the density of the recognition object (120) is represented by a, wherein 3.5 g/cm 3 ≤A≤8.92 g/cm 3 。
3. The adhesive structure (100) of claim 2, wherein the identification member (120) is a wire.
4. The adhesive structure (100) of claim 1, wherein the adhesive body (110) is adhered to the crack along a first direction (X);
wherein the first direction (X) coincides with a width direction of the piece (200) to be processed.
5. Adhesive construction (100) according to claim 4, wherein said identifier (120) is arranged extending in said first direction (X) on said gel (110).
6. The adhesive structure (100) according to claim 5, wherein said identifier (120) has an extension length L and a width W of said member to be worked (200), wherein L is 1/2 W.ltoreq.L.ltoreq.W.
7. Adhesive construction (100) according to claim 5, wherein the cross-sectional area of the identifier (120) perpendicular to the first direction (X) is marked S, wherein 0.0314mm 2 ≤S≤0.196mm 2 。
8. The adhesive structure (100) of claim 4, wherein the adhesive structure (100) further comprises a fixing portion (130), the fixing portion (130) extending along the second direction (Y) and being adapted to be stuck at the crack;
wherein the second direction (Y) intersects the first direction (X).
9. The adhesive construction (100) of claim 8, wherein the fixing portion (130) is connected to the adhesive body (110), and at least one end of the fixing portion (130) along the second direction (Y) extends out of the adhesive body (110).
10. The adhesive construction (100) according to claim 9, wherein there are at least two fixing portions (130), and all the fixing portions (130) are connected to the adhesive body (110) at intervals along the first direction (X).
11. Adhesive construction (100) according to any of claims 1-10, wherein the adhesive body (110) comprises a body layer (111) and a protective layer (112) attached to the body layer (111), the identifying body (120) is arranged between the body layer (111) and the protective layer (112), and a side of the body layer (111) facing away from the protective layer (112) is configured to be adhered to the crack.
12. A battery cell detection method is characterized by comprising the following steps:
acquiring image information of a pole piece (210) in the battery cell in a scanning mode;
and judging whether a recognition object (120) exists on the pole piece (210) according to the brightness of the image information, wherein the recognition object (120) is the recognition object (120) in the adhesive structure (100) according to any one of claims 1-11.
13. The cell detection method according to claim 12, wherein the step of determining whether the identifier (120) is present on the pole piece (210) according to the brightness of the image information comprises:
and if the brightness of at least one position on the image information is higher than the image brightness corresponding to the pole piece (210), judging that the recognition body (120) exists on the pole piece (210).
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CN111337490A (en) * 2020-01-19 2020-06-26 广东微电新能源有限公司 Battery gluing detection method
WO2020153063A1 (en) * 2019-01-25 2020-07-30 東レ株式会社 Inspection method and manufacturing method for structure and inspection apparatus and manufacturing apparatus for structure
CN113689447A (en) * 2020-05-19 2021-11-23 华晨宝马汽车有限公司 Method, device, apparatus and system for identifying strip-shaped fixing parts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1384364A (en) * 2001-05-07 2002-12-11 三星电子株式会社 Battery testing system
WO2020153063A1 (en) * 2019-01-25 2020-07-30 東レ株式会社 Inspection method and manufacturing method for structure and inspection apparatus and manufacturing apparatus for structure
CN110165323A (en) * 2019-05-29 2019-08-23 上海精测半导体技术有限公司 Lithium battery recovery method and equipment
CN111337490A (en) * 2020-01-19 2020-06-26 广东微电新能源有限公司 Battery gluing detection method
CN113689447A (en) * 2020-05-19 2021-11-23 华晨宝马汽车有限公司 Method, device, apparatus and system for identifying strip-shaped fixing parts

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