Pole piece stripping device and method for measuring floating amount of adhesive in active material layer of pole piece stripping device

Abstract

The invention discloses a pole piece stripping device and a method for measuring the floating amount of an adhesive in an active material layer of the pole piece stripping device, the pole piece stripping device comprises a first sealing cavity, a fixing table, a spray head, a second sealing cavity and a heating and weighing component, the fixing table is arranged in the first sealing cavity, the spray head is arranged in the first sealing cavity, and the heating and weighing component is arranged in the second sealing cavity. The second sealing cavity is communicated with the first sealing cavity, or the second sealing cavity is separated from the first sealing cavity, and the heating and weighing component is arranged in the second sealing cavity. According to the scheme provided by the invention, the angle of the pole piece on the fixed table is adjusted by adjusting the angle of the spray head, the spraying speed and the aperture size of the nozzle and adjusting the angle of the fixed table in the first sealing cavity, so that the height and depth of the spray head sprayed on the pole piece can be accurately controlled, and the volume of powder on the pole piece can be accurately stripped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pole piece stripping device and a method for measuring the floating amount of adhesive in the active material layer. BACKGROUND

[0002] The film area of the pole piece of the battery cell is an active material layer composed of various complex substances and bonded to the current collector. The adhesive in the active material layer plays an important role therein. However, in the actual process, the adhesive will be affected by the process and appear to float, which will affect the performance of the battery cell and needs to be tested to obtain the floating amount. In order to obtain the floating amount of the adhesive, the pole piece film area needs to be stripped and sampled by a stripping device.

[0003] The stripping device in the related art cannot accurately strip and sample when in use. SUMMARY

[0004] In view of the above problems, the present application provides a pole piece stripping device and a method for measuring the floating amount of adhesive in the active material layer, which can solve the problem that the stripping device cannot accurately strip and sample when in use.

[0005] To solve the above technical problems, the present application provides a pole piece stripping device, comprising: a first sealed cavity; a fixing table, the fixing table is arranged in the first sealed cavity and is configured to fix the pole piece, and the fixing table can rotate within a preset angle relative to the first sealed cavity; a spray head, the spray head is arranged in the first sealed cavity, the spray head is configured to spray high-pressure high-speed solid particles and spray the solid particles onto the pole piece to strip the active material layer on the pole piece, the angle of the spray head relative to the pole piece is adjustable, at least one of the spray speed and the nozzle caliber of the spray head is adjustable, and the solid particles do not change phase, decompose or chemically react with the surrounding medium in the temperature range of -20℃ to 400℃; a second sealed cavity, the second sealed cavity is in communication with the first sealed cavity, or the second sealed cavity is spaced apart from the first sealed cavity; a heating and weighing component, the heating and weighing component is arranged in the second sealed cavity.

[0006] In the technical scheme of the embodiment of the present application, the angle, the spraying speed and the nozzle caliber of the spray head are adjusted, and the angle of the fixed table in the first sealing cavity is adjusted to adjust the angle of the pole piece on the fixed table, so that the height and the depth of the spray head sprayed on the pole piece can be accurately controlled, and thus the volume of the powder on the pole piece can be accurately peeled off. After the powder peeled off is obtained, the powder peeled off and the solid particles used by the spray head during peeling are all transferred to the second sealing cavity, and after being heated by the heating and weighing component, the pyrolysis weight is obtained, and finally the floating amount of the adhesive in the pole piece can be accurately calculated.

[0007] Since the solid particles do not melt or undergo other phase changes in the range, they always remain in the solid particle state, thereby ensuring that the fluidity and the jet dynamics characteristics remain unchanged. Moreover, the solid particles do not thermally decompose to produce gas or residues like some polymers or salts, thereby avoiding contamination of the powder peeled off. At the same time, the solid particles do not undergo oxidation reactions with oxygen and water vapor in the air, which ensures that the peeling is a pure physical and mechanical process, the product is pure, and the calculation accuracy of the floating amount of the adhesive is further improved.

[0008] In some embodiments, the spray head is configured to have both the spraying speed and the nozzle caliber thereof independently adjustable. In this way, by adjusting the corresponding spraying speed and nozzle caliber, the pressure of the solid particles sprayed by the spray head on the pole piece can be conveniently adjusted to effectively peel off the powder on the pole piece.

[0009] In some embodiments, the spraying speed of the spray head is 10 m / s-200 m / s.

[0010] In this way, it is avoided that when the spraying speed is too low, the kinetic energy of the solid particles sprayed by the spray head is insufficient to effectively overcome the bonding force between the film layer and the current collector, resulting in incomplete peeling and low efficiency, or even failure to peel off. At the same time, it is avoided that when the spraying speed is too high, the kinetic energy of the solid particles sprayed by the spray head is too large to cause damage to the corresponding current collector after successfully peeling off the film layer. By limiting the spraying speed of the spray head, the solid particles sprayed by the spray head can effectively peel off the film layer without damaging the corresponding current collector.

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

[0012] In this way, by limiting the nozzle caliber of the spray head, it is avoided that when the nozzle caliber is too large, the impact area is large and the peeling boundary is not clear.

[0013] In some embodiments, the spray head is made of a wear-resistant material.

[0014] In this way, the spray head has wear resistance, can significantly resist the erosion of corresponding solid particles under high-pressure high-speed spraying, and long-term maintain the stability of the nozzle aperture size and shape.

[0015] In some embodiments, the pole piece stripping device further comprises a locking mechanism, the locking mechanism is arranged in the first sealed cavity, and the locking mechanism is connected with the fixed table; The locking mechanism is configured to fix the fixed table at a target angle. In this way, the fixed table can be fixed at a target angle.

[0016] In some embodiments, the pole piece stripping device further comprises a check component, the check component is arranged in the first sealed cavity and the second sealed cavity, and the check component is configured to prevent the powder in the second sealed cavity from flowing back into the first sealed cavity. In this way, the powder in the second sealed cavity can be effectively prevented from flowing back into the first sealed cavity.

[0017] The application also provides a method for measuring the floating amount of the adhesive in the active material layer on the pole piece, which is executed by using the device according to any one of the embodiments of the application, and the method comprises the following steps: Calculating the weight of the solid particles used for stripping the pole piece by the spray head ; Transferring the stripped pole piece powder and the solid particles used for stripping into the second sealed cavity, and obtaining the total weight of the stripped pole piece powder and the solid particles used for stripping by the heating and weighing component ; Calculating the weight of the stripped pole piece powder ; Heating the stripped pole piece powder, and obtaining a new weight after pyrolysis of the adhesive in the pole piece powder ; Calculating the weight of the pyrolyzed adhesive ; Calculating the floating amount of the adhesive = the weight of the pyrolyzed adhesive / the weight of the stripped pole piece powder .

[0018] The application also provides a method for measuring the floating amount of the adhesive in the active material layer on the pole piece, which is executed by using the device according to any one of the embodiments of the application, and the method comprises the following steps: Obtaining a pole piece A and a pole piece B, and setting the active material layer weights of the pole piece A and the pole piece B to be consistent, the adhesive distribution ratios to be consistent, and the adhesive contents to be consistent Calculating the weight of the pole piece A ; Heating the pole piece A to obtain a new weight of the pole piece A after removal of the adhesive ; Calculating the weight of the adhesive in the pole piece A ; The content of the adhesive in the pole piece B is obtained according to the weight of the adhesive in the pole piece A = ; The weight of the pole piece B is obtained ; The weight of the pole piece B after peeling is calculated ; The pole piece B after peeling is heated to obtain the weight of the pole piece B without adhesive after peeling ; The weight of the pole piece powder peeled off is calculated ; The weight of the adhesive on the pole piece after peeling is calculated ; The floating amount of the adhesive in the pole piece B is calculated .

[0019] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are included only to illustrate the embodiments and are not considered to be limiting of the present application. Moreover, in the entire drawings, identical reference numerals designate identical parts. In the drawings: Figure 1 Structure schematic diagram of the pole piece peeling device provided for some embodiments of the present application; Figure 2 Another structure schematic diagram of the pole piece peeling device provided for some embodiments of the present application; Figure 3 Pole piece schematic diagram provided for some embodiments of the present application; Figure 4 Another pole piece schematic diagram provided for some embodiments of the present application; Figure 5 Rotation schematic diagram of the fixing table provided for some embodiments of the present application.

[0021] Reference numerals in the detailed description are as follows: 10, first sealed cavity; 11, fixing table; 12, pole piece; 13, spray head; 14, particle flow; 15, spray material and pole piece powder; 16, check valve; 20, second sealed cavity; 21, heating and weighing component. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0024] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0025] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is 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 of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0027] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the orientations or positional relationships indicated by 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", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] Next, the present application will be described in detail.

[0031] At present, the film area of the electrode sheet of the produced battery cell is an active material layer composed of a plurality of complex different substances and bonded on the current collector, wherein the binder in the active material layer plays an important role. However, in the actual process, the binder will be affected by the process and appear to float, which will affect the performance of the battery cell and needs to be tested to obtain the floating proportion. In order to obtain the floating amount of the adhesive, the film area of the electrode sheet needs to be peeled off and sampled by a peeling device.

[0032] The peeling device in the related art needs to peel off the film area of the electrode sheet manually, and since manual peeling of the film area of the electrode sheet has the problem of low precision, the floating amount of the adhesive cannot be accurately calculated.

[0033] Based on the above considerations, in order to solve the problem that the peeling device cannot accurately peel the sample during use, a pole piece peeling device is designed, which comprises a first sealed cavity, a fixing table, a spray head, a second sealed cavity and a heating and weighing component, wherein the fixing table is arranged in the first sealed cavity and is configured to fix the pole piece, the fixing table can rotate within a preset angle relative to the first sealed cavity, the spray head is arranged in the first sealed cavity, the spray head is configured to spray high-pressure and high-speed solid particles and spray the solid particles onto the pole piece to peel the active material layer on the pole piece, the angle of the spray head relative to the pole piece is adjustable, the spray head is configured such that at least one of the spray speed and the nozzle caliber of the spray head is adjustable, and the solid particles do not change phase, decompose or chemically react with the surrounding medium within a temperature range of -20 DEG C to 400 DEG C; the second sealed cavity is in communication with the first sealed cavity, or the second sealed cavity is spaced apart from the first sealed cavity, and the heating and weighing component is arranged in the second sealed cavity.

[0034] In the technical scheme of the embodiments of the present application, the angle, spray speed and nozzle caliber of the spray head are adjusted, and the angle of the fixing table in the first sealed cavity is adjusted to adjust the angle of the pole piece on the fixing table, so that the height and depth of the spray head on the pole piece can be accurately controlled, thereby accurately peeling the volume of the powder on the pole piece. After obtaining the peeled powder, the peeled pole piece powder and the solid particles used by the spray head during peeling are all transferred to the second sealed cavity, and the pyrolysis weight can be obtained after heating by the heating and weighing component, and finally the floating amount of the adhesive in the pole piece can be accurately calculated. Since the solid particles do not melt or change phase within the range, they always remain in a solid particle state, thereby ensuring that the fluidity and jet dynamics characteristics remain unchanged. Moreover, the solid particles do not thermally decompose to produce gas or residues like some polymers or salts, thereby avoiding contamination of the peeled powder. At the same time, the solid particles do not oxidize with oxygen and water vapor in the air, which ensures that the peeling is a pure physical and mechanical process, the product is pure, and the calculation accuracy of the adhesive floating amount is further improved.

[0035] According to some embodiments of the present application, Figure 1 is a structural schematic diagram of the pole piece peeling device in the present application, Figure 2 is another structural schematic diagram of the pole piece peeling device in the present application, Figure 3 is a schematic diagram of the pole piece in the present application, Figure 4 is another schematic diagram of the pole piece in the present application. As Figure 1 and in combination with Figure 2 , Figure 3 , Figure 4As shown, the application provides a pole piece stripping device, which comprises a first sealed cavity 10, a fixing table 11, a spray head 13, a second sealed cavity 20, and a heating and weighing component 21. The fixing table 11 is arranged in the first sealed cavity 10 and is configured to fix the pole piece 12. The fixing table 11 can rotate within a preset angle relative to the first sealed cavity 10. The spray head 13 is arranged in the first sealed cavity 10 and is configured to spray high-pressure and high-speed solid particles and spray the solid particles onto the pole piece 12 to strip the active material layer on the pole piece 12. The angle of the spray head 13 relative to the pole piece 12 is adjustable. The spray head 13 is configured to have at least one of the spray speed and the nozzle caliber adjustable. The solid particles do not change phase, decompose, or chemically react with the surrounding medium within the temperature range of -20°C to 400°C. The second sealed cavity 20 is in communication with the first sealed cavity 10, or the second sealed cavity 20 is spaced apart from the first sealed cavity 10. The heating and weighing component 21 is arranged in the second sealed cavity 20.

[0036] The pole piece 12 in the embodiment is a corresponding pole piece.

[0037] The fixing table 11 in the embodiment can be provided with a clamp, a clamping groove, or the like to fix the pole piece 12. The actual situation can be determined, and the embodiment of the specification is not limited in this regard.

[0038] The solid particles in the embodiment can be graphite, silica sand, or the like, which are not limited herein. The solid particles do not melt or change phase within the range, and always remain in a solid particle state, thereby ensuring that the fluidity and jet dynamics characteristics remain unchanged. Moreover, the solid particles do not thermally decompose to produce gas or residues like some polymers or salts, thereby avoiding contamination of the stripped powder. At the same time, the solid particles do not oxidize with oxygen or water vapor in the air, which ensures that the stripping is a pure physical and mechanical process, and the product is pure.

[0039] The Mohs hardness of the solid particles in the embodiment is between 1 and 2, which is much lower than the copper current collector (Mohs hardness about 3) on the pole piece 12. This is a kind of “soft abrasive” impact, which can effectively strip the active material layer with stronger binding force, but causes less damage to the harder copper foil, thereby avoiding the possible perforation or severe deformation of the current collector caused by hard abrasives such as iron sand.

[0040] Meanwhile, the particle size of the solid particles is generally between 50 microns and 200 microns (i.e. about 150 mesh to 800 mesh). The particle velocity of the solid particles is generally between 100 m / s and 300 m / s or even higher. The particle velocity is selected according to the following principles: if the velocity is too low (< 100 m / s), the kinetic energy of the particles is insufficient to overcome the adhesion between the active material layer and the current collector, which may result in incomplete or impossible peeling; if the velocity is too high (> 300 m / s), although the peeling efficiency is very high, the excessive kinetic energy will be converted into excessive plastic deformation and heat energy, which may result in.

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

[0042] In the embodiment, when the solid particles sprayed by the spray head 13 act on the current collector of the pole piece 12, a very short and high-intensity stress pulse (stress wave) is generated, which spreads from the impact point to the surrounding. When the stress wave reaches the interface between the active material and the current collector, it is reflected and refracted. If the intensity of the stress wave exceeds the adhesion strength of the interface adhesive, a shear stress is generated at the interface, thereby “prying open” the bonding point and achieving interface peeling.

[0043] In the embodiment, the spray head 13 can be installed on a mechanical arm through a spherical hinge, and the rotation angle of the spray head 13 can be controlled by controlling the inclination angle of the spherical hinge. Meanwhile, a high-pressure proportional valve or a servo valve can be integrated at the discharge port of the spray head 13, and the pressure and flow of the solid particles sprayed by the spray head 13 can be accurately controlled through the high-pressure proportional valve or the servo valve, so that the jetting speed of the corresponding regulator can be adjusted. In addition, an aperture variable mechanism of the light ring type can be arranged at the nozzle caliber of the spray head 13, which mainly includes a plurality of (usually 6-8) high-strength and wear-resistant metal blades. All the blades slide synchronously to form a circular hole with a variable central aperture. In use, the opening and closing of the blades can be adjusted by a stepping motor or a servo motor driving a ring gear, so that the size of the nozzle caliber can be adjusted. Alternatively, a variable annular gap mechanism of the thimble type can be arranged at the nozzle caliber of the spray head 13, which mainly includes a conical thimble that can move along the axial direction of the nozzle caliber. By changing the annular gap between the thimble and the nozzle caliber, the size of the nozzle caliber can be equivalent to change. The specific structure of the spray head 13 is not limited in the embodiment.

[0044] In the embodiment, the heating and weighing component 21 can include a balance and a heating plate arranged on the balance, or the heating and weighing component 21 is a thermogravimetric analyzer. The specific configuration can be determined according to actual conditions, and the embodiment of the present application is not limited in this regard.

[0045] Reference Figure 1 Or Figure 2 As shown in the figure, in use, the device in this embodiment adjusts the angle, the spraying speed, and the nozzle caliber of the spray head 13, and adjusts the angle of the fixed table 11 in the first sealed cavity 10 to adjust the angle of the pole piece 12 on the fixed table 11, so that the height and depth of the particle flow 14 sprayed by the spray head 13 on the pole piece 12 can be accurately controlled, thereby accurately peeling the volume of the powder on the pole piece 12.

[0046] After the powder after peeling is obtained, the weight of the solid particles used by the spray head to peel the pole piece can be calculated according to the nozzle caliber, the spraying speed, and the spraying time of the spray head 13 At this time, the powder after peeling of the pole piece 12 and the solid particles used by the spray head 13 during peeling are mixed together to form the spray and pole piece powder 15. The weight of the spray and pole piece powder 15 is obtained by using the heating and weighing component 21 , and the weight of the pole piece powder after peeling can be calculated by the formula Subsequently, the spray and pole piece powder 15 is heated, and the new weight of the spray and pole piece powder 15 after pyrolysis of the adhesive is obtained ; the weight of the pyrolyzed adhesive can be calculated by the formula ; and finally, the floating amount of the adhesive can be calculated by the formula .

[0047] The entire process in this embodiment is carried out in the first sealed cavity 10 and the second sealed cavity 20, which effectively ensures the accuracy of the test results and avoids the mixing of external impurities into the spray and pole piece powder 15 to affect the test results. Since the solid particles do not melt or undergo other phase changes in this range, they always remain in a solid particle state, thereby ensuring that the flowability and the jet dynamics characteristics remain unchanged. Moreover, the solid particles do not thermally decompose to produce gas or residues like some polymers or salts, thereby avoiding contamination of the powder after peeling. At the same time, the solid particles do not undergo oxidation reactions with oxygen and water vapor in the air, which ensures that the peeling is a pure physical and mechanical process, the product is pure, and the calculation accuracy of the floating amount of the adhesive is further improved.

[0048] According to some embodiments of the present application, the spray head 13 is configured such that its spraying speed and nozzle caliber can be independently adjusted.

[0049] The structure of the spray head 13 in this embodiment can refer to the description above, which will not be described here again.

[0050] In use, by adjusting the corresponding spraying speed and nozzle caliber, the pressure of the solid particles in the spray head 13 sprayed onto the pole piece can be conveniently adjusted to effectively peel the powder on the pole piece.

[0051] According to some embodiments of the present application, the jet speed of the spray head 13 is 10-200 m / s. It is understood that the jet speed of the spray head 13 can also be between 50-150 m / s, which can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0052] The embodiments can avoid that the kinetic energy of the solid particles sprayed by the spray head 13 is insufficient to effectively overcome the binding force between the film layer and the current collector when the jet speed is too low, resulting in incomplete peeling, low efficiency, or even failure to peel. Meanwhile, the embodiments can avoid that the kinetic energy of the solid particles sprayed by the spray head 13 is too large to cause damage to the corresponding current collector after successfully peeling the film layer when the jet speed is too high. By limiting the jet speed of the spray head 13, the sprayed solid particles can effectively peel the film layer without damaging the corresponding current collector.

[0053] According to some embodiments of the present application, the nozzle caliber of the spray head 13 is 0.1-50 mm. It is understood that the nozzle caliber of the spray head 13 can also be between 1-10 mm, which can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0054] The embodiments can avoid that a large caliber of the spray head 13 results in a large impact area and unclear peeling boundary.

[0055] According to some embodiments of the present application, the spray head 13 is made of wear-resistant material.

[0056] The wear-resistant material in the embodiments can be hard alloy steel, tungsten carbide, etc., which is not limited herein.

[0057] Since the solid particles such as graphite particles sprayed by the spray head 13 are abrasive by nature, the graphite particles will continuously wear the nozzle under high-pressure and high-speed jetting. By limiting the spray head 13 to be made of hard alloy steel or tungsten carbide, the hard alloy steel or tungsten carbide can significantly resist the erosion of the graphite particles due to its high hardness and wear resistance, thereby maintaining the stability of the nozzle size and shape for a long time.

[0058] Moreover, graphite particles are good conductive materials. When the graphite particles and the inner wall of the non-metallic spray head (such as plastic or ceramic) rub against each other, static electricity is easily generated and accumulated, and there is a risk of spark discharge. The spray head of the present application is made of hard alloy steel, which can conduct electricity and effectively discharge the static electricity generated by friction to ground, eliminating the risk of static electricity accumulation and improving the safety of the process.

[0059] Further, the non-metal or light alloy nozzle may be deformed or broken under long-term high pressure. The nozzle formed of hard alloy steel has higher tensile strength and pressure resistance, and can ensure long-term stable operation of the nozzle under high pressure without failure. In the spraying process, the nozzle formed of hard alloy steel has better thermal stability and thermal conductivity. The thermal stability makes it not easy to soften and deform due to heating; the good thermal conductivity helps to quickly dissipate heat and prevent local overheating.

[0060] According to some embodiments of the present application, the pole piece stripping device further comprises a locking mechanism, the locking mechanism is arranged in the first sealed cavity 10, and the locking mechanism is connected with the fixed table 11; the locking mechanism is configured to fix the fixed table 11 rotated to the target angle.

[0061] The locking mechanism in the embodiment can be a telescopic rod, an air rod, etc., which is not limited here.

[0062] In use, by connecting the locking mechanism with the fixed table 11, as shown in Figure 5 , when the fixed table 11 is counterclockwise rotated between 0°-90°, for example, the fixed table 11 is counterclockwise rotated by 30°, at this time, the locking mechanism can be used to fix the fixed table 11 at the angle.

[0063] According to some embodiments of the present application, the pole piece stripping device further comprises a check component 16, the check component 16 is arranged in the first sealed cavity 10 and the second sealed cavity 20, and the check component 16 is configured to prevent the powder in the second sealed cavity 20 from flowing back to the first sealed cavity 10.

[0064] The check component 16 in the embodiment can be a one-way valve, a negative pressure valve, etc., which is not limited here.

[0065] By arranging the check component 16 between the first sealed cavity 10 and the second sealed cavity 20, the mixture of the stripped spray material and the pole piece powder 15 in the first sealed cavity 10 can be prevented from flowing back after flowing into the second sealed cavity 20 through the check component 16.

[0066] The present application also provides a method for measuring the floating amount of the adhesive in the active material layer on the pole piece, which is executed by using the device of any one of the embodiments of the present application, and the method comprises: S1: calculating the weight of the solid particles used for stripping the pole piece by the nozzle ; S2: transferring the stripped pole piece powder and the solid particles used for stripping to the second sealed cavity, and obtaining the total weight of the stripped pole piece powder and the solid particles used for stripping by the heating and weighing component ; S3: calculating the weight of the stripped pole piece powder ; S4: heating the peeled pole piece powder, and obtaining a new weight of the binder after pyrolysis of the binder in the pole piece powder ; S5: calculating the weight of the pyrolyzed binder ; S6: calculating the floating amount of the binder .

[0067] The embodiment can use the device in Figure 1 or Figure 2 to perform the peeling, when the device in Figure 1 is used to perform the peeling, there is a possibility that the mixture of the sprayed material and the pole piece powder 15 is not completely adsorbed into the second sealed cavity 20; when the device in Figure 2 is used to perform the peeling, there is a possibility that the mixture of the sprayed material and the pole piece powder 15 is not completely collected and sent into the second sealed cavity 20.

[0068] When the device in Figure 1 or Figure 2 is used to perform the peeling, it is set that the mixture of the sprayed material and the pole piece powder 15 can be completely transferred into the second sealed cavity 20, so that the weight of the solid particles used by the spray head to peel the pole piece can be calculated according to the nozzle caliber, the spraying speed and the spraying time of the spray head 13 ; at this time, the pole piece 12 powder after peeling and the solid particles used by the spray head 13 during peeling are mixed together to form the mixture of the sprayed material and the pole piece powder 15. The weight of the mixture of the sprayed material and the pole piece powder 15 is obtained by using the heating and weighing component 21 , and the weight of the pole piece powder after peeling can be calculated by the formula . Then the mixture of the sprayed material and the pole piece powder 15 is heated, and a new weight of the binder is obtained after pyrolysis of the binder in the mixture of the sprayed material and the pole piece powder 15 ; the weight of the pyrolyzed binder can be calculated by the formula ; finally, the floating amount of the binder can be calculated by the formula .

[0069] The application further provides a method for measuring the floating amount of the binder in the active material layer on the pole piece, which is executed by using the device in any one of the embodiments of the application, and is applied to the device as shown in Figure 2The device in the method is a single sample of the pole piece to be sand blasted and peeled, which is randomly cut from the whole roll of pole pieces in the battery cell factory process, and it is recognized that the pole pieces at any position of the whole roll of pole pieces in the battery cell factory process are consistent and representative. At this time, two sample pole pieces to be sand blasted and peeled are cut from the whole roll of pole pieces at random positions, which are named as pole piece A and pole piece B, and it is considered that the active material layer weights of the two pole pieces are consistent, the adhesive distribution proportions are consistent, and the adhesive contents are consistent. Therefore, the method comprises the following steps: S1: obtaining pole piece A and pole piece B, and setting that the active material layer weights of pole piece A and pole piece B are consistent, the adhesive distribution proportions are consistent, and the adhesive contents are consistent; S2: calculating the weight of pole piece A ; S3: performing a heating treatment on pole piece A to obtain the new weight of pole piece A after the adhesive is removed ; S4: calculating the weight of the adhesive in pole piece A ; S5: obtaining the content of the adhesive in pole piece B according to the weight of the adhesive in pole piece A = ; S6: obtaining the weight of pole piece B ; S7: calculating the weight of pole piece B after peeling ; S8: heating pole piece B after peeling to obtain the weight of pole piece B without adhesive after peeling ; S9: calculating the weight of the pole piece powder peeled off ; S10: calculating the weight of the adhesive on the pole piece after peeling S11: ; S12: calculating the floating amount of the adhesive in pole piece B .

[0070] Through the method, the pole piece of the peeled sample can be directly weighed and calculated, instead of directly collecting the peeled powder for calculation, and the execution difficulty is reduced.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode tab peeling device characterized by comprising: The method comprises the following steps: a first sealed cavity; a fixing table arranged in the first sealed cavity and configured to fix a pole piece, the fixing table being capable of rotating within a preset angle relative to the first sealed cavity; a spray head arranged in the first sealed cavity, the spray head being configured to spray high-pressure and high-speed solid particles and spray the solid particles onto the pole piece to strip an active material layer on the pole piece; the angle of the spray head relative to the pole piece being adjustable, and the spray head being configured to have at least one of a spray speed and a nozzle caliber of the spray head being adjustable; the solid particles not undergoing phase change, decomposition or chemical reaction with the surrounding medium in a temperature range of -20°C to 400°C; a second sealed cavity in communication with the first sealed cavity or spaced apart from the first sealed cavity; a heating and weighing component arranged in the second sealed cavity.

2. The pole piece stripping apparatus of claim 1, wherein The spray head is configured to have both the spray speed and the nozzle caliber of the spray head being independently adjustable.

3. The pole piece stripping apparatus of claim 1 or 2, wherein The spray speed of the spray head is 10 m / s-200 m / s.

4. The pole piece stripping apparatus of claim 1 or 2, wherein The nozzle caliber of the spray head is 0.1 mm-50 mm.

5. The pole piece stripping apparatus of claim 1 or 2, wherein The spray head is made of a wear-resistant material.

6. The pole piece stripping apparatus of claim 1, wherein The pole piece stripping device further comprises a locking mechanism arranged in the first sealed cavity and connected with the fixing table; The locking mechanism is configured to fix the fixing table rotated to a target angle.

7. The pole piece stripping apparatus of claim 1, wherein The pole piece stripping device further comprises a check component arranged in the first sealed cavity and the second sealed cavity, the check 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 by using the device of any one of claims 1 to 7, and the method comprises the following steps: Calculating the weight of solid particles used by the showerhead stripping electrode ; The peeled pole piece powder and the solid particles used for peeling are all transferred to the second sealed cavity, and the total weight of the peeled pole piece powder and the solid particles used for peeling is obtained by heating the weighing component ; Calculate the weight of the pole piece powder after stripping ; The new weight of the pole piece powder after heating and peeling off the pole piece powder, and the adhesive in the pole piece powder is pyrolyzed ; calculating the pyrolyzed adhesive weight ; The amount of adhesive that floats up is calculated .

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 by using the device of any one of claims 1 to 7, and the method comprises the following steps: obtaining a pole piece A and a pole piece B, and setting the active material layer weights of the pole piece A and the pole piece B to be consistent, the adhesive distribution ratios to be consistent, and the adhesive contents to be consistent; Calculating the weight of the pole piece A ; The polar plate A is subjected to a heat treatment to obtain a new weight of the polar plate A after removal of the adhesive ; Calculating the weight of the adhesive in tab A ; The content of the adhesive in the pole piece B is obtained according to the weight of the adhesive in the pole piece A = ; acquiring the weight of the pole piece B ; Calculating the weight of the post-exfoliation electrode sheet B ; Heating the peeled pole piece B to obtain the weight of the peeled pole piece B without adhesive ; Calculate the weight of the electrode powder stripped out ; calculating the weight of the adhesive on the stripped pole piece ； The amount of adhesive in the tab B that floats up is calculated .

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