Pole piece peeling device and method for measuring adhesive floating amount in active material layer thereof

Abstract

The application discloses a kind of pole piece stripping device and its active material layer adhesive floating quantity measurement method, wherein the pole piece stripping device includes first sealed cavity, fixed platform, spray head, second sealed cavity and heating weighing component, wherein fixed platform is arranged in first sealed cavity, spray head is arranged in first sealed cavity, second sealed cavity is communicated with first sealed cavity, or second sealed cavity is separated from first sealed cavity, and heating weighing component is arranged in second sealed cavity.The above-mentioned scheme provided by the application can accurately control the height and depth of the spray head on the pole piece by adjusting the angle, spray speed and nozzle caliber size of the spray head, and adjusting the angle of the fixed platform in the first sealed cavity to adjust the angle of the pole piece on the fixed platform.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode stripping device and a method for measuring the amount of adhesive floating in the active material layer. Background Technology

[0002] The electrode film region of a battery cell consists of a complex layer of active materials composed of various substances bonded to the current collector, with the binder in the active material layer playing a crucial role. However, in actual manufacturing processes, the binder can float due to process variations, affecting cell performance and necessitating testing to determine the floating amount. To obtain the amount of binder floating, a stripping device is used to peel off and sample the electrode film region.

[0003] The stripping devices in related technologies cannot accurately strip and sample during use. Summary of the Invention

[0004] In view of the above problems, this application provides an electrode peeling device and a method for measuring the amount of adhesive floating in the active material layer, which can solve the problem that the peeling device cannot accurately peel and sample during use.

[0005] To address the aforementioned technical problems, this application proposes an electrode stripping device, comprising: First sealed cavity; A fixed platform is disposed in the first sealed cavity and configured to fix the electrode plate. The fixed platform can rotate relative to the first sealed cavity within a preset angle. A nozzle is disposed in the first sealed cavity and configured to spray high-pressure, high-speed solid particles onto an electrode to peel off the active material layer on the electrode. The angle of the nozzle relative to the electrode is adjustable, and the nozzle is configured to allow adjustment of at least one of its spray speed and nozzle diameter. The solid particles do not undergo phase change, decomposition, or chemical reaction with the surrounding medium within a temperature range of -20°C to 400°C. A second sealing cavity, which is connected to the first sealing cavity, or the second sealing cavity is spaced apart from the first sealing cavity; A heated weighing component is disposed within the second sealed cavity.

[0006] In the technical solution of this application embodiment, by adjusting the nozzle angle, spray speed, and nozzle diameter, and simultaneously adjusting the angle of the fixed platform within the first sealed cavity, the angle of the electrode on the fixed platform can be adjusted. This allows for precise control of the height and depth at which the nozzle sprays onto the electrode, thereby enabling accurate removal of the powder volume from the electrode. After obtaining the removed powder, the removed electrode powder and all solid particles used by the nozzle during removal are transferred to the second sealed cavity. Heating this cavity with a heating and weighing component yields the pyrolysis weight, allowing for precise calculation of the amount of binder floating in the electrode.

[0007] Because these solid particles do not melt or undergo other phase changes within this range, they remain in a solid particle state, ensuring consistent flowability and jetting dynamics. Furthermore, unlike some polymers or salts, these solid particles do not thermally decompose to produce gases or residues, thus avoiding contamination of the powder after stripping. Simultaneously, these solid particles do not react with oxygen or moisture in the air, guaranteeing that stripping is a purely physical-mechanical process, resulting in a pure product and further improving the accuracy of adhesive float calculations.

[0008] In some embodiments, the nozzle is configured such that both its spray velocity and nozzle diameter are independently adjustable. This allows for convenient adjustment of the pressure at which solid particles are sprayed onto the electrode by the nozzle, thereby effectively stripping powder from the electrode.

[0009] In some embodiments, the spray velocity of the nozzle is 10 m / s to 200 m / s.

[0010] This design avoids situations where the spray velocity is too low, resulting in insufficient kinetic energy of the solid particles ejected from the nozzle to effectively overcome the bonding force between the membrane and the current collector, leading to incomplete peeling, low efficiency, or even failure to peel. Conversely, it avoids situations where the spray velocity is too high, causing the solid particles to have excessive kinetic energy and violently impact the current collector after successful membrane peeling, resulting in damage. By limiting the nozzle's spray velocity, the ejected solid particles can effectively peel the membrane without damaging the corresponding current collector.

[0011] In some embodiments, the nozzle diameter of the spray head is 0.1mm-50mm.

[0012] In this way, by limiting the nozzle diameter of the spray head, it is possible to avoid an excessively large diameter, which would result in a large impact area and unclear peeling boundaries.

[0013] In some embodiments, the nozzle is made of abrasion-resistant material.

[0014] In this way, because the nozzle is wear-resistant, it can significantly resist the erosion of corresponding solid particles under high pressure and high speed, and maintain the stability of the nozzle diameter and shape over a long period of time.

[0015] In some embodiments, the electrode stripping device further includes a locking mechanism disposed in the first sealed cavity and connected to the fixing platform; The locking mechanism is configured to secure the fixed platform when it has been rotated to the target angle. This facilitates securing the fixed platform to the target angle.

[0016] In some embodiments, the electrode stripping device further includes a check valve disposed in the first sealed cavity and the second sealed cavity, the check valve being configured to prevent powder in the second sealed cavity from flowing back into the first sealed cavity. This effectively prevents powder in the second sealed cavity from flowing back into the first sealed cavity.

[0017] This application also proposes a method for measuring the amount of binder floating in the active material layer on an electrode, which is performed using the apparatus described in any one of the embodiments of this application. The method includes: Calculate the weight of solid particles used to peel off the nozzle electrode. ; The stripped electrode powder and solid particles used for stripping are transferred to the second sealed cavity, and the total weight of the stripped electrode powder and solid particles used for stripping is obtained by heating and weighing components. ; Calculate the weight of the electrode powder after stripping. ; After heating and peeling, the binder in the electrode powder undergoes pyrolysis to obtain a new weight. ; Calculate the weight of the pyrolyzed adhesive ; Calculate the amount of adhesive floating = .

[0018] This application also proposes a method for measuring the amount of binder floating in the active material layer on an electrode, which is performed using the apparatus described in any one of the embodiments of this application. The method includes: Obtain electrode A and electrode B, and set the active material layer weight, binder distribution ratio, and binder content of electrode A and electrode B to be the same. Calculate the weight of electrode A ; Electrode A is heated to obtain its new weight after the adhesive is removed. ; Calculate the weight of the binder in electrode A. ; The content of adhesive in electrode B is determined based on the weight of adhesive in electrode A. = ; Obtain the weight of electrode B ; Calculate the weight of electrode B after peeling. ; Electrode B after heat-peeling: Weight of electrode B without adhesive after peeling. ; Calculate the weight of the stripped electrode powder ; Calculate the weight of the adhesive on the electrode after peeling. ; Calculate the amount of adhesive that floats to the surface in electrode B = .

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the electrode stripping device provided in some embodiments of this application; Figure 2 This is yet another schematic diagram of the electrode stripping device provided in some embodiments of this application; Figure 3 Schematic diagrams of electrode sheets provided for some embodiments of this application; Figure 4 Another schematic diagram of the electrode provided in some embodiments of this application; Figure 5 This is a schematic diagram of the fixed platform rotation provided in some embodiments of this application.

[0021] The reference numerals in the detailed embodiments are as follows: 10. First sealed cavity; 11. Fixed platform; 12. Electrode; 13. Nozzle; 14. Particle flow; 15. Sprayed material and electrode powder; 16. Check valve; 20. Second sealed cavity; 21. Heating and weighing component. Detailed Implementation

[0022] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0023] Unless otherwise defined, 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0027] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0028] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] The following is a detailed description of this application.

[0031] Currently, the electrode film region of battery cells consists of a complex layer of active materials composed of various substances bonded to the current collector, with the binder in the active material layer playing a crucial role. However, in actual manufacturing processes, the binder can float due to process variations, affecting cell performance and necessitating testing to determine the floating amount. To obtain the amount of binder floating, a stripping device is required to peel off and sample the electrode film region.

[0032] When using the peeling device in the related technology, it is necessary to manually peel off the electrode film area. However, due to the low precision of manual peeling of the electrode film area, it is impossible to accurately calculate the amount of adhesive floating.

[0033] Based on the above considerations, in order to solve the problem of inaccurate stripping and sampling during the use of the stripping device, an electrode stripping device is designed. This electrode stripping device includes a first sealed cavity, a fixed platform, a nozzle, a second sealed cavity, and a heating and weighing component. The fixed platform is located in the first sealed cavity and is configured to fix the electrode. The fixed platform can rotate relative to the first sealed cavity within a preset angle. The nozzle is located in the first sealed cavity and is configured to spray high-pressure, high-speed solid particles onto the electrode to strip the active material layer on the electrode. The angle of the nozzle relative to the electrode is adjustable, and the nozzle is configured to allow adjustment of at least one of its spray speed and nozzle diameter. The solid particles do not undergo phase change, decomposition, or chemical reaction with the surrounding medium within a temperature range of -20℃ to 400℃. The second sealed cavity is connected to the first sealed cavity, or the second sealed cavity is spaced apart from the first sealed cavity. The heating and weighing component is located within the second sealed cavity.

[0034] In the technical solution of this application embodiment, by adjusting the nozzle angle, spray speed, and nozzle diameter, and simultaneously adjusting the angle of the fixed platform within the first sealed cavity, the angle of the electrode on the fixed platform can be adjusted. This allows for precise control of the height and depth at which the nozzle sprays onto the electrode, thereby enabling accurate removal of the powder volume from the electrode. After obtaining the removed powder, the removed electrode powder and all solid particles used by the nozzle during removal are transferred to the second sealed cavity. Heating this cavity with a weighing component yields the pyrolysis weight, allowing for precise calculation of the amount of binder floating in the electrode. Since the solid particles do not melt or undergo other phase changes within this range, they remain in a solid particle state, ensuring consistent flowability and spray dynamics. Furthermore, unlike some polymers or salts, these solid particles do not thermally decompose to produce gases or residues, thus avoiding contamination of the removed powder. Simultaneously, these solid particles do not react with oxygen or water vapor in the air, ensuring that the removal is a purely physical-mechanical process with pure products, further improving the accuracy of the binder floating amount calculation.

[0035] According to some embodiments of this application, Figure 1 This is a schematic diagram of the electrode stripping device in this application. Figure 2 This is another structural schematic diagram of the electrode stripping device in this application. Figure 3 This is a schematic diagram of the electrode in this application. Figure 4 This is another schematic diagram of the electrode in this application. (See diagram below.) Figure 1 and combined Figure 2 , Figure 3 , Figure 4As shown, this application provides an electrode stripping device, which includes a first sealed cavity 10, a fixed platform 11, a nozzle 13, a second sealed cavity 20, and a heating and weighing component 21. The fixed platform 11 is disposed in the first sealed cavity 10 and configured to fix the electrode 12. The fixed platform 11 is rotatable relative to the first sealed cavity 10 within a preset angle. The nozzle 13 is disposed in the first sealed cavity 10 and configured to spray high-pressure, high-speed solid particles onto the electrode. On the electrode 12, the active material layer on the electrode 12 is peeled off; the nozzle 13 is adjustable in angle relative to the electrode 12, and the nozzle 13 is configured to be adjustable in at least one of its spray speed and nozzle diameter; the solid particles do not undergo phase change, decomposition or chemical reaction with the surrounding medium in the temperature range of -20℃ to 400℃; the second sealing cavity 20 is connected to the first sealing cavity 10, or the second sealing cavity 20 is spaced apart from the first sealing cavity 10, and the heated weighing component 21 is disposed in the second sealing cavity 20.

[0036] In this embodiment, electrode 12 is the corresponding electrode.

[0037] In this embodiment, clamps, slots, etc. can be set on the fixed platform 11 to fix the electrode 12. The specific method can be determined according to the actual situation, and this embodiment of the specification does not limit this.

[0038] The solid particles in this embodiment can be graphite, silica sand, etc., and are not limited here. Since these solid particles do not melt or undergo other phase changes within this range, they remain in a solid particle state, thus ensuring that the flowability and jetting dynamics characteristics remain unchanged. Furthermore, unlike some polymers or salts, these solid particles do not thermally decompose to produce gases or residues, thereby avoiding contamination of the powder after stripping. Simultaneously, these solid particles do not undergo oxidation reactions with oxygen or water vapor in the air, ensuring that the stripping is a purely physical-mechanical process and the product is pure.

[0039] The solid particles in this embodiment have a Mohs hardness between 1 and 2, which is much lower than that of the copper current collector on electrode 12 (Mohs hardness of about 3). This is a "soft abrasive" impact, which can effectively peel off the active material layer with stronger bonding, but causes less damage to the harder copper foil, thus avoiding the current collector perforation or severe deformation that may be caused by hard abrasives such as iron sand.

[0040] Meanwhile, the particle size of these solid particles is typically between 50 and 200 micrometers (approximately 150 to 800 mesh). The particle velocity is typically between 100 and 300 m / s or even higher. The selection of particle velocity is based on the following criteria: Too low a velocity (<100 m / s): insufficient particle kinetic energy to overcome the adhesive forces within the active material layer and between it and the current collector, potentially leading to incomplete or no peeling. Too high a velocity (>300 m / s): while resulting in extremely high peeling efficiency, excessive kinetic energy is converted into excessive plastic deformation and heat, which may lead to…

[0041] In this embodiment, the spray pressure of nozzle 13 is between 0.3 MPa and 2.0 MPa. Meanwhile, the particle flow rate of solid particles is typically measured in grams per minute or kilograms per hour, for example, between 500 g / min and 5 kg / min.

[0042] In this embodiment, when the solid particles ejected from the nozzle 13 act on the current collector on the electrode 12, a very short, high-intensity stress pulse (stress wave) is generated. This stress wave propagates outward from the point of impact. When it reaches the interface between the active material and the current collector, reflection and refraction occur. If the intensity of the stress wave exceeds the bonding strength of the interface adhesive, shear stress is generated at the interface, thereby "prying open" the bonding point and achieving interface peeling.

[0043] In this embodiment, the nozzle 13 can be mounted on a robotic arm via a ball joint. The rotation angle of the nozzle 13 can be controlled by adjusting the tilt angle of the ball joint. Simultaneously, a high-pressure proportional valve or servo valve can be integrated at the discharge port of the nozzle 13. This valve allows for precise control of the pressure and flow rate of the solid particles ejected from the nozzle 13, thus regulating the spray speed. Furthermore, a variable aperture mechanism with an aperture ring can be installed at the nozzle orifice of the nozzle 13. This mechanism primarily consists of multiple (typically 6-8) high-strength, wear-resistant metal blades. All blades slide synchronously, forming a circular orifice with a variable central diameter. During use, a stepper motor or servo motor drives a ring gear to adjust the opening and closing of the blades, thereby adjusting the nozzle orifice size. Alternatively, a pin-type variable annular gap mechanism can be provided at the nozzle orifice on the nozzle 13. This mechanism mainly includes a conical pin that can move axially along the nozzle orifice. By changing the annular gap between the pin and the nozzle orifice, the size of the nozzle orifice can be changed equivalently. This embodiment does not limit the specific structure of the nozzle 13.

[0044] The heating and weighing component 21 in this embodiment may include a balance and a heating plate disposed on the balance, or the heating and weighing component 21 may be a thermogravimetric analyzer. The specific component may be determined according to the actual situation, and this embodiment does not limit it.

[0045] refer to Figure 1 or Figure 2 As shown, in this embodiment, when the device is in use, the angle of the nozzle 13, the spray speed, and the nozzle diameter are adjusted, and the angle of the fixed platform 11 in the first sealed cavity 10 is also adjusted to adjust the angle of the electrode 12 on the fixed platform 11. In this way, the height and depth of the particle stream 14 sprayed by the nozzle 13 onto the electrode 12 can be precisely controlled, thereby enabling precise stripping of the volume of powder on the electrode 12.

[0046] After obtaining the stripped powder, the weight of the solid particles used by the nozzle to strip the electrode can be calculated based on the nozzle diameter, spray speed, and spray time of the nozzle 13. At this point, the peeled electrode powder 12 and the solid particles used by the nozzle 13 during peeling are mixed together to form the spray material and electrode powder 15. The weight of the spray material and electrode powder 15 is obtained using the heated weighing component 21. Through formula The weight of the electrode powder after peeling can then be calculated. Subsequently, the sprayed material and electrode powder 15 are heated, and the binder in the sprayed material and electrode powder 15 is pyrolyzed to obtain a new weight. ; through formula The weight of the pyrolyzed adhesive can then be calculated; finally, the formula can be used. This allows you to calculate the amount of adhesive that floats to the surface.

[0047] In this embodiment, the entire process takes place within the first sealed cavity 10 and the second sealed cavity 20, effectively ensuring the accuracy of the test results and preventing external impurities from contaminating the sprayed material and electrode powder 15 and affecting the test results. Since the solid particles do not melt or undergo other phase changes within this range, they remain in a solid particle state, thus ensuring that the flowability and spraying dynamics characteristics remain unchanged. Furthermore, unlike some polymers or salts, these solid particles do not thermally decompose to produce gases or residues, thus avoiding contamination of the powder after peeling. Simultaneously, these solid particles do not undergo oxidation reactions with oxygen or water vapor in the air, ensuring that peeling is a purely physical-mechanical process, resulting in a pure product and further improving the accuracy of the adhesive float calculation.

[0048] According to some embodiments of this application, the nozzle 13 is configured such that both its spray speed and nozzle diameter are independently adjustable.

[0049] The structure of the nozzle 13 in this embodiment can be referred to the above description, and will not be repeated here.

[0050] During use, by adjusting the corresponding spray speed and nozzle diameter, the pressure of the solid particles sprayed onto the electrode in the nozzle 13 can be easily adjusted so as to effectively peel off the powder on the electrode.

[0051] According to some embodiments of this application, the spray velocity of the nozzle 13 is 10 m / s-200 m / s. It is understood that the spray velocity of the nozzle 13 can also be between 50 m / s and 150 m / s, and the specific value can be determined according to actual conditions; this specification does not limit this.

[0052] This embodiment limits the spray speed of the nozzle 13 to avoid insufficient kinetic energy in the solid particles ejected from the nozzle 13 when the spray speed is too low, which would prevent them from effectively overcoming the bonding force between the film layer and the current collector, resulting in incomplete peeling, low efficiency, or even failure to peel. Simultaneously, it avoids excessive kinetic energy in the solid particles ejected from the nozzle 13 when the spray speed is too high, which would cause them to violently impact the corresponding current collector after successful film peeling, leading to damage to the current collector. By limiting the spray speed of the nozzle 13, the ejected solid particles can effectively peel off the film layer without damaging the corresponding current collector.

[0053] According to some embodiments of this application, the nozzle diameter of the spray head 13 is 0.1mm-50mm. Of course, it is understood that the nozzle diameter of the spray head 13 can also be between 1mm and 10mm, and the specific value can be determined according to the actual situation. This specification does not limit this aspect.

[0054] This embodiment, by limiting the nozzle diameter of the nozzle 13, can avoid an excessively large diameter, which would result in a large impact area and unclear peeling boundaries.

[0055] According to some embodiments of this application, the nozzle 13 is made of a wear-resistant material.

[0056] The wear-resistant material in this embodiment can be cemented carbide steel, tungsten carbide, etc., and is not limited here.

[0057] Because the solid particles ejected from the nozzle 13, such as graphite particles, are abrasive, they will continuously wear down the nozzle under high pressure and high speed. By limiting the nozzle 13 to be made of cemented carbide steel or tungsten carbide, which have extremely high hardness and wear resistance, it can significantly resist the erosion of graphite particles, thereby maintaining the stability of the nozzle size and shape over a long period of time.

[0058] Furthermore, graphite particles are excellent conductors of electricity. When graphite particles rub intensely against the inner wall of a non-metallic nozzle (such as plastic or ceramic), static electricity is easily generated and accumulated, posing a risk of spark discharge. In contrast, the nozzle of this application is made of hard alloy steel, which is itself conductive. This allows it to effectively conduct and ground the static charge generated by friction, eliminating the risk of static electricity accumulation and improving process safety.

[0059] Furthermore, non-metallic or lightweight alloy nozzles may deform or crack under prolonged high pressure. The nozzles made of hard alloy steel in this application possess higher tensile strength and pressure resistance, ensuring stable long-term operation without failure under high pressure. During spraying, the hard alloy steel nozzles exhibit better thermal stability and thermal conductivity. Thermal stability prevents them from softening and deforming due to heat; good thermal conductivity helps dissipate heat quickly, preventing localized overheating.

[0060] According to some embodiments of this application, the electrode stripping device further includes a locking mechanism disposed in the first sealed cavity 10 and connected to the fixed platform 11; the locking mechanism is configured to fix the fixed platform 11 rotated to the target angle.

[0061] The locking mechanism in this embodiment can be a telescopic rod, a gas spring, etc., and is not limited here.

[0062] In use, the locking mechanism is connected to the fixed platform 11, as shown in the reference. Figure 5 As shown, when the fixed platform 11 rotates counterclockwise between 0° and 90°, for example, when the fixed platform 11 rotates counterclockwise by 30°, the fixed platform 11 can be easily fixed at this angle using the locking mechanism.

[0063] According to some embodiments of this application, the electrode stripping device further includes a check valve 16 disposed in the first sealing cavity 10 and the second sealing cavity 20, and the check valve 16 is configured to prevent powder in the second sealing cavity 20 from flowing back into the first sealing cavity 10.

[0064] In this embodiment, the check valve 16 can be a one-way valve, a negative pressure valve, etc., and is not limited here.

[0065] By providing a check valve 16 between the first sealed cavity 10 and the second sealed cavity 20, the mixture of abrasive and electrode powder 15 stripped from the first sealed cavity 10 can be prevented from flowing back into the second sealed cavity 20 after passing through the check valve 16.

[0066] This application also provides a method for measuring the amount of binder floating in the active material layer on an electrode, which is performed using the apparatus of any one of the embodiments of this application. The method includes: S1: Calculate the weight of solid particles used for stripping the nozzle electrode. ; S2: Transfer all the stripped electrode powder and solid particles used for stripping to the second sealed cavity, and obtain the total weight of the stripped electrode powder and solid particles used for stripping by heating the weighing component. ; S3: Calculate the weight of the electrode powder after stripping. ; S4: Electrode powder after heat stripping; the binder in the electrode powder undergoes pyrolysis to obtain a new weight. ; S5: Calculate the weight of the pyrolyzed binder. ; S6: Calculate the amount of adhesive that floats to the surface = .

[0067] This embodiment can adopt the following approach: Figure 1 or Figure 2 The device in the middle is used for peeling, when using Figure 1 When the device is peeled off, there is a possibility that the mixture of sprayed material and electrode powder 15 may not be completely adsorbed into the second sealed cavity 20; when using Figure 2 When the device is stripping, there is a possibility that the mixture of sprayed material and electrode powder 15 is not completely collected and sent to the second sealed cavity 20.

[0068] In adopting such Figure 1 or Figure 2 When the device in the middle is peeling off the electrode, the mixture of spray material and electrode powder 15 is set to be completely transferred into the second sealed cavity 20. In this way, the weight of solid particles used by the nozzle to peel off the electrode can be calculated based on the nozzle diameter, spray speed and spray time of the nozzle 13. At this point, the peeled electrode powder 12 and the solid particles used by the nozzle 13 during peeling are mixed together to form the spray material and electrode powder 15. The weight of the spray material and electrode powder 15 is obtained using the heated weighing component 21. Through formula The weight of the electrode powder after peeling can then be calculated. Subsequently, the sprayed material and electrode powder 15 are heated, and the binder in the sprayed material and electrode powder 15 is pyrolyzed to obtain a new weight. ; through formula The weight of the pyrolyzed adhesive can then be calculated; finally, the formula can be used. This allows you to calculate the amount of adhesive that floats to the surface.

[0069] This application also provides a method for measuring the amount of binder floating in the active material layer on an electrode, which is performed using the apparatus described in any of the embodiments of this application. This method is applicable to applications such as... Figure 2The apparatus described above specifies that a single electrode sheet to be sandblasted and stripped for sampling is randomly cut from a roll of electrode sheets produced in a battery cell manufacturing process. It is assumed that electrode sheets at any position on the roll of electrode sheets are consistent and representative. Two electrode sheets to be sandblasted and stripped for sampling are randomly cut from the roll of electrode sheets and named Electrode A and Electrode B, respectively. It is assumed that the active material layer weight, adhesive distribution ratio, and adhesive content of these two electrode sheets are consistent. The method then includes: S1: Obtain electrode A and electrode B, and set the active material layer weight, binder distribution ratio, and binder content of electrode A and electrode B to be the same. S2: Calculate the weight of electrode A ; S3: Heat-treat electrode A to obtain the new weight of electrode A after removing the adhesive. ; S4: Calculate the weight of the binder in electrode A. ; S5: Determine the binder content in electrode B based on the weight of the binder in electrode A. = ; S6: Obtain the weight of electrode B. ; S7: Calculate the weight of electrode B after peeling. ; S8: Weight of electrode B after heat-peeling, without adhesive. ; S9: Calculate the weight of the removed electrode powder. ; S10: Calculate the weight of the adhesive on the electrode after peeling. S11: ; S12: Calculate the amount of adhesive floating in electrode B = .

[0070] This method allows for direct weighing and calculation of the stripped electrode sheets, rather than directly collecting the stripped powder for calculation, thus reducing the difficulty of execution.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode stripping device, characterized in that, include: First sealed cavity; A fixed platform is disposed in the first sealed cavity and configured to fix the electrode plate. The fixed platform can rotate relative to the first sealed cavity within a preset angle. A nozzle is disposed in the first sealed cavity and is configured to spray high-pressure, high-speed solid particles onto the electrode to peel off the active material layer on the electrode. The nozzle is adjustable at an angle relative to the electrode, and the nozzle is configured such that at least one of its spray speed and nozzle diameter is adjustable; the solid particles do not undergo phase change, decomposition, or chemical reaction with the surrounding medium in a temperature range of -20°C to 400°C, and the Mohs hardness of the solid particles is less than the Mohs hardness of the current collector of the electrode. A second sealing cavity, which is connected to the first sealing cavity, or the second sealing cavity is spaced apart from the first sealing cavity; A heated weighing component is disposed within the second sealed cavity.

2. The electrode stripping device according to claim 1, characterized in that, The nozzle is configured such that both its spray speed and nozzle diameter can be adjusted independently.

3. The electrode stripping device according to claim 1 or 2, characterized in that, The spray speed of the nozzle is 10m / s-200m / s.

4. The electrode stripping device according to claim 1 or 2, characterized in that, The nozzle diameter of the spray head is 0.1mm-50mm.

5. The electrode stripping device according to claim 1 or 2, characterized in that, The nozzle is made of wear-resistant material.

6. The electrode stripping device according to claim 1, characterized in that, The electrode stripping device further includes a locking mechanism, which is disposed in the first sealed cavity and connected to the fixed platform; The locking mechanism is configured to secure the fixed platform when it has been rotated to the target angle.

7. The electrode stripping device according to claim 1, characterized in that, The electrode stripping device further includes a check valve component disposed in the first sealed cavity and the second sealed cavity, the check valve component being configured to prevent powder in the second sealed cavity from flowing back into the first sealed cavity.

8. A method for measuring the amount of binder floating in the active material layer on an electrode, characterized in that, The method is performed using the apparatus according to any one of claims 1 to 7, comprising: Calculate the weight of solid particles used to peel off the nozzle electrode. ; The stripped electrode powder and solid particles used for stripping are transferred to the second sealed cavity, and the total weight of the stripped electrode powder and solid particles used for stripping is obtained by heating and weighing components. ; Calculate the weight of the electrode powder after stripping. ; After heating and peeling, the binder in the electrode powder undergoes pyrolysis to obtain a new weight. ; Calculate the weight of the pyrolyzed adhesive ; Calculate the amount of adhesive floating = .

9. A method for measuring the amount of binder floating in the active material layer on an electrode, characterized in that, The method is performed using the apparatus according to any one of claims 1 to 7, comprising: Obtain electrode A and electrode B, and set the active material layer weight, binder distribution ratio, and binder content of electrode A and electrode B to be the same. Calculate the weight of electrode A ; Electrode A is heated to obtain its new weight after the adhesive is removed. ; Calculate the weight of the binder in electrode A. ; The content of adhesive in electrode B is determined based on the weight of adhesive in electrode A. = ; Obtain the weight of electrode B ; Calculate the weight of electrode B after peeling. ; Electrode B after heat-peeling: Weight of electrode B without adhesive after peeling. ; Calculate the weight of the stripped electrode powder ; Calculate the weight of the adhesive on the electrode after peeling. ； Calculate the amount of adhesive that floats to the surface in electrode B = .

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