Battery monomer self-discharge analysis system and battery production system

Abstract

The embodiment of the utility model provides a battery monomer self-discharge analysis system and a battery production system, and relates to the technical field of batteries. The battery monomer self-discharge analysis system comprises a disassembling device, a scanning imaging device and a surface analysis device. According to the application, the isolating membrane, the positive pole piece and the negative pole piece are disassembled by utilizing the disassembling equipment, the disassembled isolating membrane is scanned by the scanning imaging equipment, so that the position of the failure point is confirmed, and finally the surface analysis of the failure point is performed by the surface analysis equipment, so that compared with manual disassembly and naked eye detection, the efficiency is greatly improved. According to the technical scheme, the working efficiency and accuracy of failure point position detection are improved, the surface components and morphology of the failure points can be analyzed, the design and production process of the battery device can be optimized, and therefore the performance and reliability of the battery device produced subsequently are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell self-discharge analysis system and a battery production system. BACKGROUND

[0002] In the production process of a battery device, battery cell physical self-discharge disassembly analysis needs to be performed to better understand the performance and defects of the battery device.

[0003] In the related art, battery cell physical self-discharge disassembly analysis relies on manual observation of the isolation film to determine the failure point position of the battery cell. The detection accuracy of this method needs to be improved. Therefore, how to improve the detection accuracy of the failure point position of the isolation film is a research direction in the technical field of batteries. UTILITARIAN CONTENT

[0004] The present application provides a battery cell self-discharge analysis system which can improve the detection accuracy of the failure point position of the isolation film.

[0005] To solve the above technical problems, the present application provides a battery cell self-discharge analysis system, comprising a disassembly device, a scanning imaging device and a surface analysis device. The disassembly device is used to disassemble the isolation film, the positive electrode sheet and the negative electrode sheet of the battery cell. The scanning imaging device is used to scan the disassembled isolation film, confirm the failure point of the isolation film and mark the position information of the failure point. The surface analysis device is used to analyze the surface composition and topography of the failure point determined by the scanning imaging device.

[0006] The above technical solution uses the disassembly device to disassemble the isolation film, the positive electrode sheet and the negative electrode sheet, scans the disassembled isolation film by the scanning imaging device to confirm the position of the failure point, and finally analyzes the surface of the failure point by the surface analysis device. Compared with manual disassembly and naked eye detection, the working efficiency and accuracy of failure point position detection are improved. Moreover, the surface composition and topography of the failure point can be analyzed, which helps to optimize the design and production process of the battery device, thereby improving the performance and reliability of the subsequent production of the battery device.

[0007] In some embodiments of the present application, the disassembly device comprises a first winding device, and the first winding device is used to wind the isolation film.

[0008] The above technical solution uses the first winding device to wind the isolation film, which not only ensures the proper preservation of the isolation film after disassembly, but also facilitates the subsequent supply and collection device for rewinding.

[0009] In some embodiments of the present application, the disassembling device further comprises a second winding device for winding the positive electrode tab, and / or the disassembling device further comprises a third winding device for winding the negative electrode tab.

[0010] By using the second winding device to wind the positive electrode tab, the positive electrode tab can be properly stored after being split, which is beneficial for subsequent reuse. Similarly, by using the third winding device to wind the negative electrode tab, the negative electrode tab can be properly stored after being split, which is beneficial for subsequent reuse.

[0011] In some embodiments of the present application, the battery cell self-discharge analysis system further comprises a collecting device for collecting the isolation film removed by the disassembling device, and the scanning imaging device is used to scan the isolation film collected by the collecting device.

[0012] By using the collecting device to collect the isolation film, subsequent scanning imaging is facilitated.

[0013] In some embodiments of the present application, the collecting device comprises a fourth winding device for winding the isolation film removed by the disassembling device.

[0014] By using the fourth winding device to collect the isolation film, the structure is simple, the collected isolation film occupies a small space, and subsequent scanning and re-expansion for surface analysis are facilitated.

[0015] In some embodiments of the present application, the collecting device further comprises a tab supply device for providing an analog tab to the fourth winding device, and the fourth winding device is used to receive the isolation film delivered by the disassembling device and the analog tab provided by the tab supply device, and to wind the analog tab and the isolation film in layers.

[0016] By using the analog tab delivered by the tab supply device to simulate the original tab, the isolation film after being wound by the fourth winding device can be in a state close to or even the same as that before the battery cell is split, which simulates the actual working condition and improves the accuracy of detecting the failure point position. At the same time, the analog tab is used to isolate the adjacent two layers of isolation film, which reduces the possibility of isolation film wrinkling.

[0017] In some embodiments of the present application, the scanning imaging device comprises a scanning light emitting device, a scanning light receiving device and a signal processing device, the scanning light emitting device is configured to emit scanning light to the isolation film, the scanning light receiving device is configured to receive the scanning light, and the signal processing device is communicatively connected to the scanning light receiving device and configured to form an image and determine the position of the failure point.

[0018] By using the above technical solution, the scanning imaging device is designed to comprise a scanning light emitting device, a scanning light receiving device and a signal processing device, the scanning light emitting device is configured to emit scanning light to the failure point, the scanning light receiving device is configured to receive the scanning light, and the signal processing device is configured to form an image and determine the position of the failure point, thereby realizing the automation of the determination of the position of the failure point, and the density difference between the metal foreign matter at the failure point and the isolation film itself can be used to more accurately determine the relative position of each failure point in the battery monomer.

[0019] In some embodiments of the present application, the scanning light emitting device is an X-ray emitting device or a microwave emitting device.

[0020] By using the above technical solution, the X-ray or microwave is used to realize the imaging and position determination of the failure point, which can accurately identify the tiny defects or failure points in the isolation film, and the scanning is performed in a non-destructive manner, thereby avoiding the physical damage to the sample, so that important information can be obtained while maintaining the integrity of the material, and in addition, the complex geometry and different material characteristics can be comprehensively evaluated.

[0021] In some embodiments of the present application, the surface analysis device comprises an excitation source device and a measurement analysis device, the excitation source device is configured to emit an excitation source to the failure point, and the measurement analysis device is configured to obtain the composition and topography of the failure point covered by the excitation source.

[0022] By using the above technical solution, the surface analysis device is designed to comprise an excitation source device and a measurement analysis device, and the excitation source device and the measurement analysis device can automatically analyze the surface composition and topography of the failure point, which is more accurate than manual judgment.

[0023] In some embodiments of the present application, the surface analysis device further comprises a vacuum chamber, at least part of the excitation source device and at least part of the measurement analysis device are installed in the vacuum chamber, and the excitation source device is configured to emit an excitation source to the isolation film in the vacuum chamber.

[0024] By using the above technical solution, the emission of the excitation source is performed in a vacuum state, which can reduce the interference of impurities in the air on the detection and further improve the accuracy of the detection.

[0025] In some embodiments of the present application, the excitation source device is an X-ray excitation device.

[0026] By using the above technical solution, X-rays are used as the excitation source, and the material composition and morphology can be effectively analyzed without damaging the failure point and the isolation film, the analysis speed is fast, high-resolution imaging and composition analysis can be combined, and detailed morphology information about the failure point can be provided.

[0027] In some embodiments of the present application, the battery cell self-discharge analysis system further comprises a surface treatment device configured to perform surface treatment on the failure point before the surface analysis device performs analysis.

[0028] By using the above technical solution, surface treatment is performed on the failure point before analysis, which can remove impurities on the surface of the failure point, improve the surface flatness of the failure point, make the data acquisition more stable during subsequent analysis, reduce signal fluctuations caused by surface roughness, and improve the accuracy of subsequent analysis.

[0029] In some embodiments of the present application, the surface treatment device comprises an ion miller.

[0030] By using the above technical solution, the ion miller is used to perform surface treatment on the failure point, which can improve the processing precision, reduce the damage of surface treatment to the failure point, and improve the uniformity and flatness of the failure point after surface treatment, thereby providing effective support for subsequent analysis of the failure point.

[0031] In addition, the present application also provides a battery production system comprising the battery cell self-discharge analysis system according to any one of the above technical solutions. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0033] Figure 1 A structural schematic diagram of the battery cell self-discharge analysis system provided by some embodiments of the present application is shown in the figure.

[0034] Figure 2 A structural schematic diagram of the disassembly device of the battery cell self-discharge analysis system provided by some embodiments of the present application is shown in the figure.

[0035] Figure 3 A structural schematic diagram of the collection device of the battery cell self-discharge analysis system provided by some embodiments of the present application is shown in the figure.

[0036] Figure 4 A schematic diagram of a simulated electrode sheet after the collecting device provided by some embodiments of the present application is wound into a roll;

[0037] Figure 5 A structural schematic diagram of a scanning device of a battery cell self-discharge analysis system provided by some embodiments of the present application;

[0038] Figure 6 A structural schematic diagram of a surface analysis device of a battery cell self-discharge analysis system provided by some embodiments of the present application;

[0039] Figure 7 A structural schematic diagram of a surface treatment device of a battery cell self-discharge analysis system provided by some embodiments of the present application;

[0040] Figure 8 A work flow chart of a battery cell self-discharge analysis system provided by some embodiments of the present application.

[0041] The reference signs of the specific embodiments are as follows:

[0042] 100, a battery cell self-discharge analysis system;

[0043] 10, a disassembling device; 11, a first winding device; 111, a first winding roller; 12, a second winding device; 121, a second winding roller; 13, a third winding device; 131, a third winding roller;

[0044] 20, a scanning imaging device; 21, a scanning light emitting device; 22, a scanning light receiving device; 23, a signal processing device;

[0045] 30, a surface analysis device; 31, an excitation source device; 32, a measurement and analysis device; 33, a vacuum chamber;

[0046] 40, a collecting device; 41, a fourth winding device; 411, a fourth winding roller; 42, an electrode sheet supply device; 421, a unwinding mechanism; 422, a simulated electrode sheet;

[0047] 50, a surface treatment device; 51, an ion miller;

[0048] 200, a battery cell; 210, a separator; 211, a failure point; 220, a positive electrode sheet; 230, a negative electrode sheet. Specific embodiments

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0051] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0052] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0054] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0055] The "plurality" appearing in the present application refers to two or more (including two).

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a battery box for packaging one or more battery monomers. The battery box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomers.

[0057] The battery monomer mentioned in the embodiments of the present application can be a lithium ion secondary battery monomer, a lithium ion primary battery monomer, a lithium-sulfur battery monomer, a sodium lithium ion battery monomer, a sodium ion battery monomer or a magnesium ion battery monomer, etc. The embodiments of the present application are not limited thereto. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of the present application are not limited thereto.

[0058] The battery monomer mentioned in the embodiments of the present application can include an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery monomer mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area, and the positive electrode coating area is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0059] The battery monomer described in the embodiments of the present application is suitable for a battery and a power consumption device using the battery. The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above power consumption devices.

[0060] In the following, the embodiments of the present application are described in detail.

[0061] At present, the application of the battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of a hydraulic, thermal, wind and solar power station, but also widely applied to an electric vehicle such as an electric bicycle, an electric motorcycle and an electric automobile, and many fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also increasing.

[0062] The battery monomer is an important part of the battery device. At present, the physical self-discharge disassembly analysis of the battery monomer mainly relies on manual observation of the isolation film to determine the failure point position, and then further analyze the composition and microscopic morphology. Since the failure point area is small (10-100 um level), and the residual electrolyte and anode and cathode powder on the isolation film make it difficult to determine the failure point by appearance, more than 50% of the failed battery cells cannot find the failure point, and the failure composition and failure position cannot be analyzed.

[0063] Therefore, it is an important topic in battery production and processing to provide a technical solution that can accurately analyze the composition and position of the failure point of the isolation film.

[0064] In view of this, the present application provides a technical solution, which provides a battery monomer self-discharge analysis system, which can realize semi-automatic or even automatic failure point composition analysis and position confirmation. Compared with manual confirmation, the analysis efficiency and accuracy are higher.

[0065] In the following, the embodiments of the present application are described in detail. Figures 1-8 The battery monomer self-discharge analysis system provided in the embodiments of the present application is introduced.

[0066] In the following, the embodiments of the present application are described in detail. Figure 1As shown (the arrow in the figure is the flow direction of the separator film 210 in the battery cell self-discharge analysis system 100), the battery cell self-discharge analysis system 100 provided by the embodiment of the application includes a disassembling device 10, a scanning imaging device 20, and a surface analysis device 30. The disassembling device 10 is used to disassemble the separator film 210, the positive electrode sheet 220, and the negative electrode sheet 230 of the battery cell 200. The collecting device 40 is used to wind the separator film 210 after the disassembling device 10 disassembles, and make the separator film 210 wind to the form before disassembly. The scanning imaging device 20 is used to scan the separator film 210 after winding by the collecting device 40, confirm the failure point 211 of the separator film 210 and mark the position information of the failure point 211. The surface analysis device 30 is used to analyze the surface composition and topography of the failure point 211 determined by the scanning imaging device 20.

[0067] Before the battery cell 200 is disassembled, the separator film 210, the positive electrode sheet 220, and the negative electrode sheet 230 can have a multiple layer connection relationship, for example, one is that the separator film 210, the positive electrode sheet 220, the separator film 210, and the negative electrode sheet 230 are sequentially stacked and connected, and the other is that the separator film 210, the negative electrode sheet 230, the separator film 210, and the positive electrode sheet 220 are sequentially stacked and connected.

[0068] The “disassembly” in the disassembling device 10 should be understood in a broad sense, that is, as long as the disassembling device 10 removes part of the battery cell 200 or releases the connection of part of the components of the battery cell 200, it can be recognized as having a disassembly function. In some embodiments, the disassembling device 10 can be a structure that releases the connection of the stacked separator film 210, positive electrode sheet 220, and negative electrode sheet 230. The disassembling device 10 can be fully automatic or semi-automatic.

[0069] When the disassembling device 10 is a semi-automatic structure, it opens the shell of the battery cell 200 by artificial, and preliminarily disassembles the electrode formed by the separator film 210, the positive electrode sheet 220, and the negative electrode sheet 230, and then separates the separator film 210, the positive electrode sheet 220, and the negative electrode sheet 230 by using the disassembling device 10.

[0070] When the disassembling device 10 is a fully automatic structure, the disassembling device 10 can include a mechanical hand structure, which preliminarily disassembles the electrode by the mechanical hand, and then separates the separator film 210, the positive electrode sheet 220, and the negative electrode sheet 230 by using a roller structure.

[0071] The scanning imaging device 20 is used to scan the isolation film 210 after being wound by the collecting device 40, and after scanning, the isolation film 210 and the failure point 211 thereon can be imaged into a two-dimensional or three-dimensional image. Moreover, the scanning imaging device 20 can have a certain analysis function, which can confirm the coordinate information of the specific position of the failure point 211 of the isolation film 210, thereby providing a data basis for subsequent surface analysis.

[0072] Wherein, the "failure point 211" refers to the position of the local short circuit or other abnormal phenomenon generated on the isolation film 210 when the battery monomer 200 is physically self-discharged.

[0073] The surface analysis device 30 can perform surface analysis of the failure point 211 by the position of the failure point 211 determined by the scanning imaging device 20, and the composition and topographic features (such as size, shape, and size, etc.) of the failure point 211 can be obtained.

[0074] As can be known from the above description, the battery monomer self-discharge analysis system 100 provided in the embodiment splits the isolation film 210, the positive electrode sheet 220 and the negative electrode sheet 230 by using the disassembling device 10, winds the isolation film 210 to the form before splitting by using the collecting device 40, then confirms the position of the failure point 211 by using the scanning imaging device 20, and finally performs surface analysis of the failure point 211 by using the surface analysis device 30. Compared with manual splitting and naked eye detection, the working efficiency and accuracy of the position detection of the failure point 211 are improved, and the surface composition and topography of the failure point 211 can be analyzed, which is helpful for optimizing the design and production process of the battery device, thereby improving the performance and reliability of the subsequent production battery device.

[0075] In combination with the accompanying drawings, Figure 2 As shown in the drawings, in some examples, the disassembling device 10 optionally comprises a first winding device 11, and the first winding device 11 is used to wind the isolation film 210.

[0076] The first winding device 11 can comprise a first winding driving member (not shown in the drawings) and a first winding roller 111, and the first winding driving member can be a driving structure such as a motor, a pneumatic cylinder, a hydraulic cylinder, etc.

[0077] In some embodiments, the first winding device 11 can further comprise a first transmission mechanism (not shown in the drawings) connected between the first winding driving member and the first winding roller 111. Taking the example that the first winding driving member is a motor, the first transmission mechanism can be a structure such as a shaft coupling, a speed reducer, etc. Similarly, taking the example that the first winding driving member is a pneumatic cylinder, the first transmission mechanism can be a structure for converting linear motion into rotary motion, such as a gear and rack structure.

[0078] The first driving member and the first transmission mechanism can drive the first winding roller 111 to rotate forward and backward around its own axis, and this embodiment does not make too many enumerations.

[0079] The isolation film 210 is wound by the first winding device 11, which not only allows the isolation film 210 to be properly stored after being split, but also facilitates subsequent rewinding by the collecting device 40.

[0080] In some examples, the disassembling device 10 also includes a second winding device 12 for winding the positive electrode tab 220, and / or the disassembling device 10 also includes a third winding device 13 for winding the negative electrode tab 230.

[0081] The above technical solutions include three implementation manners. One is to only include the second winding device 12, and the disassembling manner of the negative electrode tab 230 is not limited. Another is to only include the third winding device 13, and the disassembling manner of the positive electrode tab 220 is not limited. The third is as shown in Figure 2 the second winding device 12 and the third winding device 13, and the positive electrode tab 220 is wound by the second winding device 12 at the same time, and the negative electrode tab 230 is wound by the third winding device 13.

[0082] The structure of the second winding device 12 and the third winding device 13 can be the same as or similar to that of the first winding device 11. For example, the second winding device 12 includes a second winding driving member (not shown in the figure) and a second winding roller 121, and the third winding device 13 includes a third winding driving member (not shown in the figure) and a third winding roller 131.

[0083] Since the structure of the first winding device 11 has been described above, this embodiment does not make too many descriptions of the second winding device 12 and the third winding device 13.

[0084] The positive electrode tab 220 is wound by the second winding device 12, which allows the positive electrode tab 220 to be properly stored after being split, facilitating subsequent reuse. Similarly, the negative electrode tab 230 is wound by the third winding device 13, which allows the negative electrode tab 230 to be properly stored after being split, facilitating subsequent reuse.

[0085] In some embodiments, the number of isolation films 210 is multiple, and the number of first winding devices 11 is multiple, and the multiple first winding devices 11 are used to correspondingly wind the multiple isolation films 210.

[0086] The "plurality of separators 210" means that the number of separators 210 can be two or more. Similarly, the "plurality of first winding devices 11" means that the number of first winding devices 11 can be two or more.

[0087] For example, when the electrode sheet of the battery device has a structure in which the separators 210, the positive electrode sheet 220, the separators 210, and the negative electrode sheet 230 are sequentially stacked and connected, the number of separators 210 is two.

[0088] In order to separately disassemble the two separators 210 and to facilitate subsequent separate detection of the two separators 210, the number of first winding devices 11 is also designed to be two.

[0089] The number of first winding devices 11 is designed to be multiple in this embodiment, which matches the at least two layers of separators 210 provided on one battery monomer 200, so that each separator 210 can be wound by the corresponding first winding device 11, and then wound again by the subsequent collection device 40.

[0090] In combination with the drawings Figure 1 and the drawings Figure 3 As shown in some examples, the battery monomer self-discharge analysis system 100 also includes a collection device 40 for collecting the separators 210 removed by the disassembly device 10, and the scanning imaging device 20 is used to scan the separators 210 collected by the collection device 40.

[0091] The collection device 40 is a device for receiving the separators 210 removed by the disassembly device 10. The collection device can be any collection method such as winding collection, folding collection, etc., to temporarily store the separators 210, thereby facilitating subsequent scanning processing.

[0092] The collection method of the collection device 40 for the separators 210 can be folding, winding, etc., and of course can also be directly flat, which is not enumerated one by one in this embodiment.

[0093] In some examples, the collection device 40 includes a fourth winding device 41 for winding the separators 210 removed by the disassembly device 10.

[0094] The fourth winding device 41 can have the same or similar structure and working principle as the first winding device 11, the second winding device 12, and the third winding device 13 described above.

[0095] For example, the fourth winding device 41 can include a fourth winding driving member (not shown in the figure) and a fourth winding roller 411. The fourth winding driving member can be a motor, a cylinder, a hydraulic cylinder, or the like as described above, and in some embodiments, the fourth winding device 41 can further include a fourth transmission mechanism (not shown in the figure) connected between the fourth winding driving member and the fourth winding roller 411.

[0096] When the fourth winding device 41 is winding, one end of the isolation film 210 is located at the starting position point (the starting position for calculating the length of the isolation film 210), and the winding length of the isolation film 210 is calculated by the fourth winding roller 411 of the standard cylinder, so as to match the position of the failure point 211 confirmed by the scanning imaging device 20, so that after the fourth winding device 41 rewinds the isolation film 210, the position information of the subsequent surface analysis of the failure point 211 can also be matched.

[0097] The fourth winding device 41 is used to collect the isolation film 210 in this embodiment, which has a simple structure and occupies a small space after collection, facilitating subsequent scanning and surface analysis after being unfolded again.

[0098] In combination with the drawings Figure 3 and the drawings Figure 4 As shown, in some examples, the collection device 40 further includes a pole piece supply device 42, which is used to provide an analog pole piece 422 to the fourth winding device 41. The fourth winding device 41 is used to receive the isolation film 210 delivered by the disassembly device 10 and the analog pole piece 422 provided by the pole piece supply device 42, and to wind the analog pole piece 422 and the isolation film 210 in layers.

[0099] The pole piece supply device 42 includes a unwinding mechanism 421 on which the analog pole piece 422 is wound.

[0100] The material of the analog pole piece 422 can be metal, plastic, etc., and its shape is a sheet that can be deformed and wound, as long as it does not affect the structure and physical and chemical properties of the isolation film 210 itself.

[0101] When winding, each layer of the isolation film 210 after winding can be isolated by the intermediate analog pole piece 422, forming Figure 4 the structure in the figure (the dotted structure in the figure is the failure point 211), thereby reducing the possibility of wrinkles occurring after the contact of the adjacent two isolation films 210.

[0102] In addition, the analog pole piece 422 delivered by the pole piece supply device 42 is used to simulate the original pole piece, so that the isolation film 210 after being wound by the fourth winding device 41 can be close to or even the same as the state before the battery monomer 200 is disassembled, simulating the actual working conditions, and improving the accuracy of the position detection of the failure point 211.

[0103] In some embodiments, the isolation film 210 and the simulation pole piece 422 can also be wound in a manner that simulates the original winding manner of the battery monomer 200, for example, one simulation pole piece 422 is arranged between the two layers of isolation film 210 after disassembly, and another simulation pole piece 422 is arranged on the surface of one of the isolation films 210 away from the other isolation film 210, so as to be closer to the original winding form and size of the isolation film 210 in the battery monomer 200.

[0104] In combination with the accompanying Figure 5 As shown in some examples, the scanning imaging device 20 can optionally include a scanning light emitting device 21, a scanning light receiving device 22, and a signal processing device 23. The scanning light emitting device 21 is used to emit scanning light to the isolation film 210. The scanning light receiving device 22 is used to receive the scanning light. The signal processing device 23 is in communication connection with the scanning light receiving device 22 and is used to form an image and determine the position of the failure point 211.

[0105] The scanning light emitting device 21 is used to emit scanning light to the isolation film 210. The scanning light refers to an excitation source such as an electron beam, an ion beam, or a laser beam for imaging or analysis.

[0106] In some embodiments, the scanning light can be X-rays, microwaves, or transmission electron beams, laser beams, ion beams, etc.

[0107] The scanning light receiving device 22 refers to a structure for receiving and detecting the light emitted by the scanning light emitting device 21, and can convert the photoelectric effect of the beam into an electrical signal, providing a data basis for the signal processing device 23.

[0108] The signal processing device 23 refers to a device that can receive data and process and image the data. It can include a signal acquisition structure, an analog-to-digital conversion structure, a signal processing structure, a data reconstruction structure, and an image display structure (not shown in the figure).

[0109] The signal acquisition structure receives signals generated by the scanning source, light, electron beam, or ion beam. The analog-to-digital conversion structure then converts the received analog electrical signal into a digital signal through an analog-to-digital converter. The digital signal after analog-to-digital conversion enters the signal processing unit, which performs amplification, filtering, denoising, etc. according to the settings and requirements of the device.

[0110] The processed signals are then reconstructed by a data reconstruction structure according to the scanning path and parameters during scanning, and based on the signal intensity or response characteristics of each point, the computer can restore the two-dimensional or three-dimensional image of the sample. Finally, the processed and reconstructed signals are transmitted to an image display structure, such as a computer display screen or a printer, to present a clear image result.

[0111] Through the above processing of the data signals, the signal processing device 23 can obtain the interval size of each layer of the separator film 210 after being wound by the fourth winding device 41 and the length size of the winding, and can obtain the position coordinates of each failure point 211 on each layer of the separator film 210, thereby providing a basis for the position data of the failure point 211 for subsequent surface analysis.

[0112] Through the above steps, the signal processing device 23 of the scanning imaging device 20 can effectively convert the received electrical signals into visual images, achieving imaging and analysis of the sample.

[0113] The above structure designs the scanning imaging device 20 to include the scanning light emitting device 21 for emitting scanning light to the failure point 211, the scanning light receiving device 22 for receiving the scanning light, and the signal processing device 23 for forming images and determining the position of the failure point 211, achieving automation of the determination of the position of the failure point 211, and more accurately determining the relative position of each failure point 211 in the battery monomer 200 by using the density difference between the metal foreign matter at the failure point 211 and the separator film 210 itself.

[0114] In some examples, the scanning light emitting device 21 is an X-ray emitting device or a microwave emitting device.

[0115] The X-ray emitting device and the microwave emitting device have multiple advantages as excitation sources for surface detection of the failure point 211. First, they can penetrate non-metallic materials and generate signals inside the material, which makes them very effective in detecting deeply buried failure points 211 or hidden defects, so they can directly scan the separator film 210 after being wound by the collecting device 40.

[0116] Second, the X-ray emitting device can provide high-resolution imaging, which helps to identify small details or defects. In addition, these emitting devices generally do not cause damage to the tested sample, so they can be safely applied to various materials and components.

[0117] In addition, both X-rays and microwaves have strong transmission and penetration power, which can deeply detect the internal structure without damaging the tested sample, helping to accurately detect the problems on the surface of the failure point 211.

[0118] In summary, the embodiment uses X-rays or microwaves to realize the imaging and position determination of the failure point 211, which can accurately identify the tiny defects or failure points 211 in the isolation film 210, and can scan in a non-destructive manner to avoid physical damage to the sample, so as to obtain important information while maintaining the integrity of the material.

[0119] In combination with the accompanying Figure 6 As shown in some examples, optionally, the surface analysis device 30 includes an excitation source device 31 and a measurement analysis device 32, the excitation source device 31 is used to emit an excitation source to the failure point 211, and the measurement analysis device 32 is used to obtain the composition and topography of the failure point 211 covered by the excitation source.

[0120] The excitation source device 31 is used to emit an excitation source to the failure point 211 on the isolation film 210, and the measurement analysis device 32 is used to accept the excitation source emitted to the failure point 211 and obtain the composition and topography of the failure point 211. The measurement analysis device 32 can be signal connected with the aforementioned signal processing device 23, so as to obtain the position of the failure point 211 and analyze the failure point 211.

[0121] Unlike the functions of the scanning light emitting device 21 and the scanning light receiving device 22 of the aforementioned scanning imaging device 20, the excitation source device 31 and the measurement analysis device 32 of the embodiment can provide high-contrast and high-resolution images, which are helpful for observing tiny surface defects and interface structures in the sample, and auxiliary processors and the like can derive the composition and topography of the failure point 211.

[0122] That is, the scanning imaging device 20 and the surface analysis device 30 are two different imaging technologies. The scanning imaging device 20 mainly concerns the confirmation of the three-dimensional structure of the isolation film 210 and the position of the failure point 211, while the surface analysis device 30 focuses on the imaging of the surface and interface of the failure point 211, and is suitable for high-resolution surface and interface analysis.

[0123] The surface analysis device 30 is designed to include the excitation source device 31 and the measurement analysis device 32, and the excitation source device 31 and the measurement analysis device 32 can automatically analyze the surface composition and topography of the failure point 211, which is more accurate than manual judgment.

[0124] In some examples, optionally, the surface analysis device 30 further includes a vacuum chamber 33, at least part of the excitation source device 31 and at least part of the measurement analysis device 32 are installed in the vacuum chamber 33, and the excitation source device 31 is used to emit an excitation source to the isolation film 210 in the vacuum chamber 33.

[0125] The vacuum chamber 33 refers to a chamber structure whose internal space can be configured as a vacuum, for example, it can include a chamber and a vacuum structure communicating with the chamber.

[0126] The excitation source device 31 and the measurement and analysis device 32 can all be located in the vacuum chamber 33, or part of the excitation source device 31 can be located in the vacuum chamber 33, and part of the measurement and analysis device 32 can be located in the vacuum chamber 33, as long as the excitation source device 31 can emit the excitation source to the isolation film 210 in the vacuum chamber 33, and the measurement and analysis device 32 can receive the excitation source in the vacuum chamber 33.

[0127] The emission of the excitation source in the vacuum state can reduce the interference of impurities in the air on the detection, and further improve the accuracy of the detection.

[0128] In some examples, optionally, the excitation source device 31 is an X-ray excitation device.

[0129] When the excitation source device 31 is an X-ray excitation device, the surface analysis equipment 30 of the embodiment can be a phase field microscope (XPF), which can provide high-contrast and high-resolution images, and is helpful for observing small surface defects and interface structures in the sample.

[0130] When the surface analysis equipment 30 is a phase field microscope (XPF) or other equipment with penetrating detection, the isolation film 210 wound by the fourth winding device 41 can be directly analyzed. When the surface analysis equipment 30 is equipment with only scanning but without penetrating detection, the isolation film 210 wound by the fourth winding device 41 needs to be opened, and then the isolation film 210 and the analog pole piece 422 are sliced and detected in segments.

[0131] The embodiment uses X-ray as the excitation source, which can effectively analyze the material composition and topography without damaging the failure point 211 and the isolation film 210, and has a fast analysis speed. The embodiment can combine high-resolution imaging and composition analysis to provide detailed topographic information about the failure point 211.

[0132] In some examples, optionally, the battery cell self-discharge analysis system 100 further includes a surface treatment equipment 50, which is used to perform surface treatment on the failure point 211 before the surface analysis equipment 30 analyzes the failure point 211.

[0133] Surface treatment refers to removing impurities on the surface of the failure point 211, including oxides, dust, etc. By performing surface treatment on the failure point 211 by the surface treatment equipment 50, the surface flatness of the failure point 211 can be improved, so that the data obtained during subsequent analysis is more stable, the signal fluctuation caused by the rough surface is reduced, and the accuracy of subsequent analysis is improved.

[0134] In some embodiments, the surface treatment equipment 50 includes an ion mill 51.

[0135] The ion mill 51 is a non-contact surface treatment technology that avoids surface damage and deformation that can be caused by traditional mechanical grinding, and is suitable for surface treatment of thin films or sensitive materials.

[0136] Moreover, the ion mill 51 can achieve high-precision processing of the surface, and controllable ion bombardment can remove surface impurities and oxide layers while maintaining high surface flatness and smoothness.

[0137] In addition, the ion mill 51 can provide targeted cleaning treatment, which can effectively remove defects, contaminants or oxide layers on the surface of the isolation film 210, and help restore the function and performance of the isolation film 210.

[0138] Most importantly, the surface of the isolation film 210 treated by the ion mill 51 is smoother and cleaner, which helps to improve the resolution and accuracy during imaging.

[0139] Of course, the surface treatment device 50 of the present embodiment can also be a laser cleaning device and a plasma cleaning device, etc., which will not be enumerated one by one in the present embodiment.

[0140] In combination with the accompanying Figure 8 The specific analysis steps of the battery cell self-discharge analysis system 100 of the present embodiment are as follows:

[0141] The isolation film 210, the positive electrode tab 220 and the negative electrode tab 230 of the battery cell 200 are split by the disassembly device 10;

[0142] The isolation film 210 is simulatedly wound by the collection device 40;

[0143] The isolation film 210 after simulated winding is scanned by the scanning imaging device 20, and the position information of the failure point 211 of the isolation film 210 is confirmed;

[0144] The surface of the failure point 211 of the isolation film 210 is treated by the surface treatment device 50;

[0145] Finally, the surface composition and topography of the failure point 211 are obtained by the surface analysis device 30.

[0146] Finally, please refer to the accompanying Figures 1-8As shown, the battery cell self-discharge analysis system 100 provided by the embodiments of the present application includes a disassembling device 10, a scanning imaging device 20, and a surface analysis device 30. The disassembling device 10 is used to disassemble the separator film 210, the positive electrode tab 220, and the negative electrode tab 230 of the battery cell 200. The scanning imaging device 20 is used to scan the disassembled separator film 210, confirm the failure point 211 of the separator film 210, and mark the position information of the failure point 211. The surface analysis device 30 is used to analyze the surface composition and topography of the failure point 211 at the position determined by the scanning imaging device 20. The disassembling device 10 includes a first winding device 11 used to wind the separator film 210. The disassembling device 10 further includes a second winding device 12 used to wind the positive electrode tab 220, and / or the disassembling device 10 further includes a third winding device 13 used to wind the negative electrode tab 230. The battery cell self-discharge analysis system 100 further includes a collecting device 40 used to collect the separator film 210 disassembled by the disassembling device 10. The scanning imaging device 20 is used to scan the separator film 210 collected by the collecting device 40. The collecting device 40 includes a fourth winding device 41 used to wind the separator film 210 disassembled by the disassembling device 10. The collecting device 40 further includes a tab supply device 42 used to supply an analog tab 422 to the fourth winding device 41. The fourth winding device 41 is used to receive the separator film 210 delivered by the disassembling device 10 and the analog tab 422 supplied by the tab supply device 42, and wind the analog tab 422 and the separator film 210 in layers. The scanning imaging device 20 includes a scanning light emitting device 21, a scanning light receiving device 22, and a signal processing device 23. The scanning light emitting device 21 is used to emit scanning light to the separator film 210. The scanning light receiving device 22 is used to receive the scanning light. The signal processing device 23 is in communication connection with the scanning light receiving device 22, and is used to form an image and determine the position of the failure point 211. The scanning light emitting device 21 is an X-ray emitting device or a microwave emitting device. The surface analysis device 30 includes an excitation source device 31 and a measurement and analysis device 32. The excitation source device 31 emits an excitation source to the failure point 211. The measurement and analysis device 32 is used to obtain the composition and topography of the failure point 211 covered by the excitation source. The surface analysis device 30 further includes a vacuum chamber 33. At least part of the excitation source device 31 and at least part of the measurement and analysis device 32 are installed in the vacuum chamber 33. The excitation source device 31 is used to emit the excitation source to the separator film 210 in the vacuum chamber 33. The excitation source device 31 is an X-ray excitation device. The battery cell self-discharge analysis system 100 further includes a surface treatment device 50 used to perform surface treatment on the failure point 211 before analysis by the surface analysis device 30. The surface treatment device 50 includes an ion mill 51.

[0147] In addition, the application further provides a battery production system, comprising the battery monomer self-discharge analysis system 100 of the technical solution, in addition to this, the battery production system further comprises a battery monomer production device (not shown in the figure), after the battery monomer production device produces a battery monomer, the battery monomer is analyzed and detected by using the battery monomer self-discharge analysis system 100.

[0148] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0149] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell self-discharge analysis system, characterized by, The battery cell self-discharge analysis system comprises: a disassembling device for disassembling the separator, the positive electrode tab and the negative electrode tab of a battery cell; a scanning imaging device for scanning the disassembled separator, identifying the failure point of the separator and marking the position information of the failure point; and a surface analysis device for analyzing the surface composition and topography of the failure point marked by the scanning imaging device.

2. The battery cell self-discharge analysis system of claim 1, wherein, The disassembling device comprises a first winding device for winding the separator.

3. The battery cell self-discharge analysis system of claim 2, wherein, The disassembling device further comprises a second winding device for winding the positive electrode tab and / or a third winding device for winding the negative electrode tab.

4. The battery cell self-discharge analysis system of claim 1, wherein, The battery cell self-discharge analysis system further comprises a collecting device for collecting the separator disassembled by the disassembling device, and the scanning imaging device is used for scanning the separator collected by the collecting device.

5. The battery cell self-discharge analysis system of claim 4, wherein, The collecting device comprises a fourth winding device for winding the separator disassembled by the disassembling device.

6. The battery cell self-discharge analysis system of claim 5, wherein, The collecting device further comprises a tab supplying device for supplying an analog tab to the fourth winding device, and the fourth winding device is used for receiving the separator delivered by the disassembling device and the analog tab supplied by the tab supplying device, and winding the analog tab and the separator in layers.

7. The battery cell self-discharge analysis system of any one of claims 1-6, wherein, The scanning imaging device comprises a scanning light emitting device for emitting scanning light to the separator, a scanning light receiving device for receiving the scanning light, and a signal processing device in communication connection with the scanning light receiving device and used for forming an image and determining the position of the failure point.

8. The battery cell self-discharge analysis system of claim 7, wherein, The scanning light emitting device is an X-ray emitting device or a microwave emitting device.

9. The battery cell self-discharge analysis system of any one of claims 1-6, wherein, The surface analysis device comprises an excitation source device for emitting an excitation source to the failure point, and a measurement and analysis device for obtaining the composition and topography of the failure point covered by the excitation source.

10. The battery cell self-discharge analysis system of claim 9, wherein, The surface analysis device further comprises a vacuum chamber, and at least part of the excitation source device and at least part of the measurement and analysis device are installed in the vacuum chamber, and the excitation source device is used for emitting an excitation source to the separator in the vacuum chamber.

11. The battery cell self-discharge analysis system of claim 9, wherein, The excitation source device is an X-ray excitation device.

12. The battery cell self-discharge analysis system of any one of claims 1-6, wherein, The battery cell self-discharge analysis system further comprises a surface treatment device for surface treatment of the failure point before surface analysis by the surface analysis device.

13. The battery cell self-discharge analysis system of claim 12, wherein, The surface treatment device comprises an ion miller.

14. A battery production system characterized by comprising: The battery cell self-discharge analysis system comprises any one of claims 1-13.

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