Electrode plate production method, control device and equipment

Abstract

The embodiment of the invention provides an electrode piece production method, a control device and equipment. The production method of the electrode pole piece comprises the following steps: slitting a pole band along the length direction to obtain a slit pole band, and rewinding the slit pole band to obtain a cylindrical short roll; burr length detection is conducted on the cylindrical short coil end face, and the typical length of burrs is determined; and determining a target coating thickness according to the typical length characteristics, and coating the end face of the cylindrical short roll with an insulating coating according to the target coating thickness. By the adoption of the scheme, the coating thickness can be adaptively and accurately set, most burrs in the end face of the slitting pole end can be covered, and the problem that due to deterioration of the previous cutting process, burrs are too long, but the coating thickness of an insulating coating is insufficient, the tip end of too many burrs is exposed is solved; and therefore, the problem that the insulating coating is punctured by excessive burrs after subsequent assembly is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and specifically designs an electrode plate production method, a control device and equipment. Background Art

[0002] In order to simplify the production process and improve production efficiency, in the production process of battery pole pieces, a continuous coating method is first used to coat the electrode material layer on a wider current collector (the width of the current collector is at least twice the width of the final pole piece) to form a pole strip, and then the pole strip is cut into slit pole strips with the same width as the pole piece width, and the slit pole strips are cut in the length direction to form pole pieces.

[0003] Since the cutting knife is used to continuously cut the pole strips in the process of cutting the pole strips, burrs are inevitably generated on the cut sections of the formed pole strips. In the later battery winding and assembly process, the burrs may cause the battery to fail the voltage withstand test, and may also puncture the diaphragm between the positive and negative windings to cause a micro short circuit in the battery cell.

[0004] In order to prevent burrs from piercing the diaphragm and causing a micro short circuit in the battery cell, the related art proposes to apply an insulating coating to the end face of the split pole strip and use the insulating coating to cover the burrs. However, the related art uses a constant coating thickness to control the coating of the aforementioned insulating coating, and does not adjust the coating thickness according to the actual situation, resulting in some split pole strips being coated with an insulating coating, but the tip of the burr on the end face is still exposed, and there is still the problem of piercing the diaphragm. Summary of the invention

[0005] In order to solve the above technical problems, the embodiments of the present disclosure provide an electrode sheet production method, a control device and a control equipment.

[0006] In a first aspect, an embodiment of the present disclosure provides a method for producing an electrode sheet, comprising:

[0007] The pole strip is cut along the length direction to obtain cut pole strips, and the cut pole strip is rewound to obtain cylindrical short rolls;

[0008] Performing burr length detection on the end surface of the cylindrical short coil to determine the typical length of the burr;

[0009] A target coating thickness is determined according to the typical length, and an insulating coating is applied to the end surface of the cylindrical short roll according to the target coating thickness.

[0010] Optionally, before applying the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness, the method further comprises:

[0011] An anti-spraying protective layer is wound on the circumferential surface of the cylindrical short roll.

[0012] Optionally, coating the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness includes:

[0013] Determining a coating amount of the insulating coating solution according to the target coating thickness;

[0014] Applying the insulating coating solution on the end surface of the cylindrical short roll according to the coating amount;

[0015] The insulating coating solution is dried to form an insulating coating having a thickness equal to the target coating thickness.

[0016] Optionally, before determining the coating amount of the insulating coating solution according to the target coating thickness, the method further includes:

[0017] Determining coating performance parameters of the insulating coating solution;

[0018] Determining the coating amount of the insulating coating solution according to the target coating thickness includes: determining the coating amount of the insulating coating solution according to the target coating thickness and the coating performance parameter.

[0019] Optionally, the method further includes: determining the number of coating times and the coating percentage of each coating;

[0020] The step of coating the insulating coating solution on the end surface of the cylindrical short roll according to the coating amount comprises:

[0021] Determining the coating amount of each coating according to the coating amount and the coating percentage;

[0022] The insulating coating solution is applied successively on the end surface of the cylindrical short roll according to the divided coating amounts.

[0023] Optionally, it also includes: determining the coating interval length according to the corresponding divided coating amounts in the previous two adjacent coatings;

[0024] The insulating coating solution is successively coated on the end surface of the cylindrical short roll according to the divided coating amounts, including: after performing the previous coating, performing the next coating operation after an interval of the coating interval.

[0025] Optionally, in the process of coating the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness, the method further includes:

[0026] The cylindrical short coil is controlled to rotate about its own horizontal axis.

[0027] Optionally, the burr length of the cylindrical short roll end surface is measured to determine the typical length of the burr located on the short roll end surface;

[0028] Performing length detection on the burrs on the end surface of the cylindrical short roll to determine multiple burr lengths;

[0029] The mean value and the mean square error of the plurality of burr lengths are obtained, and the typical length is determined according to the mean value and the mean square error.

[0030] In a second aspect, an embodiment of the present disclosure provides an electrode sheet production control device, comprising:

[0031] A slitting control unit, used for controlling the slitting of the pole strip along the length direction to obtain slit pole strips, and rewinding the slit pole strips to obtain cylindrical short rolls;

[0032] A burr detection unit, used for controlling the burr length detection on the end surface of the cylindrical short roll to determine the typical length of the burr;

[0033] A coating control unit is used to determine a target coating thickness according to the typical length, and to apply an insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

[0034] In a third aspect, an embodiment of the present disclosure provides a control device, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the corresponding execution device is controlled to implement the electrode plate production method as described above.

[0035] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0036] According to the scheme provided by the embodiment of the present disclosure, after the pole strip is cut to obtain the cut pole strip, and the cut pole strip is rewound to obtain a cylindrical short roll, the burr length of the end face of the cylindrical short roll is first detected, and after the typical length of the burr is determined, the target coating thickness of the insulating coating is determined according to the typical length of the burr, and the insulating coating is applied to the end face of the cylindrical short roll according to the target coating thickness. In this way, the coating thickness can be adaptively and accurately set, and most of the burrs in the extreme end face of the cut can be covered, avoiding the problem of excessive burr tip exposure caused by excessive burrs due to deterioration in the previous cutting process but insufficient insulating coating thickness, and then avoiding the problem of excessive burrs piercing the insulating coating after subsequent assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, including:

[0039] Figure 1 is a flow chart of a battery pole piece production method provided by an embodiment of the present disclosure;

[0040] Figure 2 is a schematic diagram of a cut polar band obtained by cutting the polar band;

[0041] Figure 3 is a flow chart of an electrode sheet production method provided by another embodiment of the present disclosure;

[0042] Figure 4 It is a structural schematic diagram of an electrode sheet production control device provided by an embodiment of the present disclosure;

[0043] Figure 5 It is a structural diagram of a control device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0045] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0046] In order to solve the problem that the burrs formed in the process of slitting the electrode strip to obtain the slit electrode strips may cause the battery to fail the withstand voltage test, and the burrs may pierce the diaphragm between the positive and negative electrode windings to cause a micro short circuit in the battery cell, the embodiment of the present disclosure provides a new electrode sheet production method. After obtaining the slit electrode strips, the new electrode sheet production method applies an insulating coating to the slit cross section of the slit electrode strip, and uses the insulating coating to cover the burrs, so as to avoid the battery withstand voltage test failing due to discharge at the burr tip during the battery withstand voltage test, and to avoid the burrs piercing the diaphragm to cause a micro short circuit in the battery cell.

[0047] Figure 1 : is a flow chart of the battery electrode production method provided by the embodiment of the present disclosure. Figure 1 As shown, the electrode plate production method provided in the embodiment of the present disclosure includes S110-S120.

[0048] S110: Slitting the pole strip along the length direction to obtain slit pole strips, and rewinding the slit pole strips to obtain cylindrical short rolls.

[0049] The pole strip is a long strip formed by coating the electrode material layer on the current collector. In the disclosed embodiment, the length of the pole strip is much longer than the length of the pole piece when winding and assembling the pole group, and the width of the pole strip is at least twice the width of the pole piece. In order to use the pole strip to obtain the pole piece, the pole strip needs to be cut.

[0050] In a specific implementation, in order to efficiently cut the electrode strip to form the electrode piece, the electrode strip is usually cut in the length direction to form the cut electrode strip, and then each cut electrode strip is cut in the width direction. In the electrode piece production method of the embodiment of the present disclosure, the electrode strip is cut along the length of the electrode piece according to the traditional cutting process to obtain the cut electrode strip.

[0051] In some embodiments, the electrode sheet production line is a continuous production line. After the electrode material layer is coated on the current collector in the previous process and the electrode material layer is dried to obtain the electrode strip, the electrode strip is directly subjected to a slitting process to obtain slit electrode strips.

[0052] In some other embodiments, the electrode sheet production line is not a continuous production line. After the electrode strip production is completed in the previous process, the electrode strip is rewound by the rewinder to form an electrode roll. Subsequently, in the slitting process, after the unwinder unwinds the electrode roll into an electrode strip, the electrode strip is transported to the slitting equipment for slitting to obtain a slit electrode strip. Figure 2 This is a schematic diagram of the polar bands obtained by cutting the polar bands. Figure 2As shown, after the pole strip 20 is cut into the cut pole strips 201, burrs 203 will be formed on the cut cross section 202 (that is, the cut edge) of the cut pole strips. Because the burrs 203 are mostly pointed structures, after the charge is distributed on them, the burrs can easily form pointed discharges. In addition, because the current collectors that make up the pole strips are mostly made of metal materials, the burrs 203 are also metal thorns. After the battery is assembled, it is easy to short the insulating material diaphragm in the battery, causing the electrode material layers at both ends of the diaphragm to be directly short-circuited.

[0053] After the slit pole strip is obtained by slitting, the method of the embodiment of the present disclosure rewinds the slit pole strip to obtain a cylindrical short roll. According to the characteristics of the distribution of the burr 203 on the slit cross section, it can be determined that after the cylindrical short roll is obtained by rewinding, the burr is located on the short roll end face of the cylindrical short roll. In a specific implementation, after the cylindrical short roll is formed by rewinding the slit pole strip, the short roll cross section of the cylindrical short roll is coated with an insulating coating, and a shorter coating process can be used to achieve the coating of the insulating coating of the slit cross section of the entire slit pole strip. In addition, after the slit pole strip is rewound into a cylindrical short roll, the slit cross section is coated with an insulating coating, which can reduce the insulating coating being applied to the electrode material layer of the slit pole strip, thereby minimizing the problem of local failure of the electrode material layer due to the coating of the insulating coating. In a specific embodiment, when the slit pole strip is rewound to obtain a cylindrical short roll, the slit pole strip is rewound according to the set rewinding tension to obtain a cylindrical short roll.

[0054] The rewinding tension is a tension determined by the material characteristic parameters of the current collector constituting the electrode strip and the width of the slit electrode strip. When the slit electrode strip is rewound using the rewinding tension, the slit electrode strip can be tightly rewound without plastic deformation. In this way, when the insulating coating is subsequently applied to the short roll section, the insulating coating can be prevented from penetrating into the gap of the electrode material layer adjacent to the short roll section, thereby reducing the area of ​​the electrode material layer coated with the insulating coating.

[0055] S120: Detect the burr length on the end face of a cylindrical short roll and determine the typical length of the burr.

[0056] In the disclosed embodiment, the burr length detection is performed on the end surface of the cylindrical short roll, and multiple burr lengths can be determined.

[0057] In a specific embodiment, image detection may be used, laser radar scanning detection may be used, or contact sensor detection may be used.

[0058] The burr length is measured by image detection, which can be achieved by using a pre-trained neural network model to process the end face image of a cylindrical short roll, identify the burrs therein and determine the size of the burrs.

[0059] The laser radar scanning method is used to measure the burr length. The laser radar is used to scan the end surface of the cylindrical short roll to obtain point cloud data. Then, feature recognition is performed based on the point cloud data to determine the location and size of the burr.

[0060] The burr length is measured by contact sensor detection, that is, a three-coordinate measuring instrument is used to detect the end face of a cylindrical short roll, the height fluctuation dimensions at various positions of the end face of the cylindrical short roll are obtained, and the position and size of the burr are determined by analyzing the height fluctuation dimensions.

[0061] After determining the burr size of the cylindrical short coil end face, a data analysis of the aforementioned burr size is then performed to determine the typical length of the burr.

[0062] The typical length of the burr is the size that characterizes the range of most burr sizes on the end face of a cylindrical short roll, that is, most burr sizes are smaller than the typical length.

[0063] In some embodiments, the sizes of the burrs may be sorted to obtain a sorted queue, and the size of the burr at a specific position in the sorted queue may be used as a typical length.

[0064] In some other embodiments, the typical length of the burr may be determined by using the following S121.

[0065] S121: Calculate the mean and mean square deviation of multiple burrs, and determine the typical length according to the mean and mean square deviation.

[0066] In a specific embodiment, after the mean and mean square deviation of a plurality of burrs are obtained, the maximum length of the burrs that meets the set percentage can be determined according to the mean and mean square deviation, and the maximum length is used as the typical length.

[0067] S130: Determine a target coating thickness according to typical length characteristics, and apply an insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

[0068] After determining the typical length of the burr, the target coating thickness can then be determined based on the typical length. In some embodiments, the target coating thickness is determined based on the typical length, and the typical length can be directly used as the target coating thickness. In other embodiments, the target coating thickness is determined based on the typical length, and a data table can be searched using the typical length to determine the coating thickness associated with the typical length as the target coating thickness. After determining the target coating thickness, the insulating coating can then be controlled to be coated on the end surface of the cylindrical short roll according to the target coating thickness, so that the thickness of the insulating coating reaches the target coating thickness.

[0069] According to the production method of battery pole pieces provided by the embodiment of the present disclosure, after the pole strip is slit to obtain slit pole strips and the slit pole strip is rewound to obtain cylindrical short rolls, the burr length of the end face of the cylindrical short roll is first detected to determine the typical length of the burr, and then the target coating thickness of the insulating coating is determined according to the typical length of the burr, and the insulating coating is coated on the end face of the cylindrical short roll according to the target coating thickness.

[0070] By using the production method of battery pole pieces provided by the embodiment of the present disclosure, the target coating thickness is determined according to the typical size of the burrs on the end face of a cylindrical short roll, so that the coating thickness can be set more accurately, and most of the burrs in the extreme end face of the slitting can be covered, thereby avoiding the problem of excessive burr tips being exposed due to the burrs being too long but the insulating coating thickness being insufficient due to deterioration in the previous cutting process, and further avoiding the problem of excessive burrs piercing the insulating coating after subsequent assembly.

[0071] Figure 3 FIG. 1 is a flow chart of an electrode sheet production method provided by another embodiment of the present disclosure. Figure 3 As shown, in some other embodiments of the present disclosure, the electrode sheet production method includes S210-S240.

[0072] S210: Slitting the pole strip along the length direction to obtain slit pole strips, and rewinding the slit pole strips to obtain cylindrical short rolls.

[0073] S220: Burr length is measured on the end face of cylindrical short roll to determine the typical length of burr.

[0074] S230: Winding an anti-spraying protective layer on the circumferential surface of the cylindrical short roll.

[0075] S240: Determine a target coating thickness according to typical length characteristics, and apply an insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

[0076] In the embodiment of the present disclosure, S210-S220 are the same as S110-S120 in the above text, and S240 is the same as S130 in the above text, which will not be repeated here. Different from the above embodiment, in the embodiment of the present disclosure, before the insulating coating is applied to the end surface of the cylindrical short roll according to the target coating thickness, the anti-spraying protective layer is wound on the circumferential surface of the cylindrical short roll.

[0077] The protective layer is used to protect the insulating coating from being coated on the circumferential surface of the cylindrical short roll. In a specific implementation, the protective layer can be formed by wrapping a plastic wrap or foam on the circumferential surface of the cylindrical short roll.

[0078] When the aforementioned protective layer is formed and the insulating coating is applied to the short roll section formed by the slitting section in S130, the insulating coating can be avoided on the outermost layer of the cylindrical short roll, thereby avoiding local functional failure of the outermost slit pole band.

[0079] In a specific implementation, the above-mentioned step of coating the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness includes S310-S330.

[0080] S310: Determine the coating amount of the insulating coating solution according to the target coating thickness.

[0081] In practical applications, in order to form an insulating coating on the end face of a cylindrical short roll, an insulating coating solution needs to be applied to the end face of the cylindrical short roll, and after the solvent in the insulating coating solution evaporates, the solute forms an insulating coating. The coating control process directly controls the amount of insulating coating, so the amount of insulating coating solution needs to be determined according to the target coating thickness.

[0082] In a specific implementation, after the target coating thickness is determined, the target coating amount of the insulating coating solution may be determined according to a correspondence between the predetermined coating thickness and the coating amount of the insulating coating solution.

[0083] In some embodiments, different types of insulating coating solutions are used according to specific circumstances. Different types of insulating coating solutions have different performance characteristics, and the same volume of different types of insulating coating solutions form different coating thicknesses. Therefore, in practical applications, it is necessary to determine the coating performance parameters of the insulating coating solution, and then determine the coating amount according to the target coating thickness and the coating performance parameters of the insulating coating solution.

[0084] S320: Apply the insulating coating solution on the end surface of the cylindrical short roll according to the coating amount.

[0085] After determining the coating amount of the insulating coating solution, the insulating coating solution can then be coated on the end surface of the cylindrical short roll using a set coating method.

[0086] In a specific implementation, the insulating coating solution may be applied to the end surface of the cylindrical short roll by brushing or spraying.

[0087] In a specific embodiment, the insulating coating is applied on the short roll section by a spraying process. The nozzle used in the spraying process is a slit nozzle, which can fully utilize the Venturi effect to achieve uniform coating of the insulating material. In a specific implementation, the distance between the nozzle and the short roll section in the spraying process can be set to 1-3 mm, which is specifically determined according to the thickness of the insulating coating to be sprayed. During the spraying process, the nozzle movement speed can be between 0.1-10 m / min, which is also specifically determined by the thickness of the insulating coating to be sprayed.

[0088] In a specific implementation, the spray amount of the insulating coating can be calculated using y=Q*t / [(a+v*t)*b], where Q is the spray amount of the insulating coating, a is the width of the slit nozzle, b is the length of the slit nozzle, and v is the moving speed of the slit nozzle.

[0089] S330: Drying the insulating coating solution to form an insulating coating having a target coating thickness.

[0090] In order to accelerate the volatilization of the solvent in the insulating coating solution and prevent the insulating coating solution from falling off due to long-term gravity after being coated on the end surface of the cylindrical short roll, thereby causing uneven coating thickness (more often causing insufficient thickness in certain areas), after spraying the insulating coating on the end surface of the cylindrical short roll, the insulating coating solution can be dried to accelerate the volatilization rate of the solvent, so that the insulating coating solution can quickly form a solid insulating coating on the end surface of the cylindrical short roll.

[0091] In a specific implementation, the slit pole strip can be passed through a tunnel furnace to dry the insulating coating through a high-temperature drying process in the tunnel furnace, thereby obtaining a dried coating. In a specific implementation, the drying process parameters of the tunnel furnace need to be determined according to actual conditions. In a specific application, the drying temperature used in the tunnel furnace can be 90-140°C, and the passing speed of the slit pole strip can be 5-20m / min.

[0092] In some embodiments, in order to ensure that the sprayed insulating coating can better cover the burrs, S340 may be further performed before performing the aforementioned S320.

[0093] S340: Determine the number of coating times and the coating percentage of each coating time.

[0094] In practical applications, if the coating of the insulating coating solution is completed in one time, poor coating may occur because the coating solution just coated on the cross section of the short roll splashes under its own gravity. In order to solve this problem, a distributed coating method can be adopted to apply the insulating coating one by one. The divided coating method can accelerate the evaporation of the solute in the insulating coating solution and reduce the splashing problem caused by the strong gravity. To solve this problem, a participle coating method can be used to apply a determined coating amount of insulating coating solution to the end surface of the cylindrical short roll. Accordingly, it is necessary to determine the number of coatings and the coating percentage of each coating. For example, in one embodiment, a two-coating method can be used to apply the insulating coating on the cut cross section of the split pole band. When the two coatings are applied, the coating amount of the insulating coating is 30% for the first coating, and the coating amount of the insulating coating is 70% for the second coating.

[0095] In a specific implementation, the number of coatings and the coating percentage of each coating can be determined according to the coating amount, wherein the number of coatings is positively correlated with the coating amount. For example, in some embodiments, the number of coatings and the coating percentage of each coating corresponding to various coating amount ranges are predetermined, and after the coating amount is determined, the number of coatings and the coating percentage of each coating can be directly determined according to the coating amount.

[0096] When executing the aforementioned S340, the aforementioned S320 is specifically S321-S322.

[0097] S321: Determine the coating amount of each coating according to the coating amount and the coating percentage.

[0098] The fractional coating amount of each coating is determined according to the coating amount and the coating percentage, and the fractional coating amount is directly obtained by multiplying the coating amount and the coating percentage.

[0099] S322: Apply the insulating coating solution on the end surface of the cylindrical short roll in sequence according to the divided coating amount.

[0100] After determining the divided coating amounts, the insulating coating solution can then be applied to the end surface of the cylinder one by one according to the divided coating amounts.

[0101] In some embodiments, while executing the aforementioned S340, the following S350 may also be executed.

[0102] S350: Determine the coating interval length according to the corresponding divided coating amounts in the previous coating between two adjacent coatings.

[0103] In order to achieve a better split coating effect, after completing one coating, you can wait for a while before the next coating, so that part of the solvent in the previous coating solution evaporates, thereby improving the adhesion effect of the previous coating solution. Accordingly, it is necessary to determine the coating interval length based on the previous corresponding split coating amount in two adjacent coatings.

[0104] In a specific implementation, the coating interval duration can be determined according to the predetermined correspondence between the divided coating amounts and the coating time interval durations, and according to the divided coating amounts of the previous coating.

[0105] When executing the aforementioned S250, the process of executing S320 may specifically include S323.

[0106] After the previous coating is performed, the next coating operation is performed after the coating interval time.

[0107] In the case of executing the aforementioned S260, the aforementioned S231 may include S2311.

[0108] S2311: Apply the insulating coating solution in batches according to the amount of each batch of coating, and perform a pause operation according to the coating interval between two adjacent batches of coating.

[0109] In some embodiments, during the process of applying the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness, the cylindrical short roll can also be controlled to rotate around its own horizontal axis.

[0110] In practical applications, in order to ensure uniform coating and prevent the coating from penetrating into the interior of the cylindrical short roll, the central axis of the cylindrical short roll is set horizontally, and during the process of coating the insulating coating, the central axis of the cylindrical short roll rotates at a constant speed. By rotating the central axis of the cylindrical short roll at a constant speed, the problem of uneven coating caused by the undried insulating coating being always subjected to gravity in one direction can be avoided. Of course, in order to avoid the centrifugal force that causes the coating solution to splash, the rotation speed of the cylindrical short roll should not be too high.

[0111] As analyzed above, in the embodiment of the present disclosure, an insulating coating solution is applied to the cut cross-section of the cut electrode strip. In a specific implementation, the insulating coating solution can be a coating liquid formed by dissolving polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride and acrylic resin as solutes in N-methylpyrrolidone, wherein the concentration of the solute can be controlled between 3% and 10%. Of course, other materials can also be used as insulating solutes, and are not limited to the aforementioned materials. However, considering that the aforementioned materials are commonly used materials for making electrode material coating solutions, and can make the insulating coating solution have better adhesion on the electrode material layer, the insulating material is preferably the aforementioned materials.

[0112] The specific preparation process of the insulating coating solution is as follows: first weigh a certain amount of N-methylpyrrolidone liquid, then add polyvinylidene fluoride-hexafluoropropylene and acrylic resin into the liquid, stir and defoam. The stirring paddle speed angular velocity that can be used during the stirring process is 20-40rpm / min, and the stirring time is 60-180min. The stirring paddle speed used in the defoaming process is 10-30rpm / min, and the stirring time is 30-60min.

[0113] Table 1 is a table of withstand voltage test of batteries formed by insulating coating solutions made with various formulas. As shown in Table 1, when the insulating material in the insulating coating solution is PVDF-HFP and the coating amount of the insulating coating solution is 1.5g / m2, the withstand voltage test defective rate of the pole piece is the lowest, which is 1.3%. Therefore, the aforementioned PVDF-HFP can be used as the insulating material for configuring the insulating coating solution, and the coating amount of the insulating coating solution in the actual coating process is controlled at 1.5g / m2.

[0114] Table 1 Test table of voltage resistance test of batteries formed by insulating coating solutions made with various formulas

[0115] Example Insulation coating composition Coating amount / (g / m2) Hi-pot defect rate Control group none 0 6.8％ Example 1 Polyvinylidene fluoride-hexafluoropropylene 0.5 4.2％ Example 2 Polyvinylidene fluoride-hexafluoropropylene 1.0 2.1％ Example 3 Polyvinylidene fluoride-hexafluoropropylene 1.5 1.3％ Example 4 Acrylic resin 0.5 4.6％ Example 5 Acrylic resin 1.0 2.3％ Example 6 Acrylic resin 1.5 1.7％

[0116] In addition to providing the aforementioned electrode sheet production method, the embodiment of the present disclosure also provides an electrode sheet production control device. Figure 4 Schematic diagram of the structure of the electrode sheet production control device provided by the embodiment of the present disclosure. Figure 4 As shown, the electrode sheet production control device 400 includes a slitting control unit 401 , a burr detection unit 402 , and a coating control unit 403 .

[0117] The slitting control unit 401 is used to control the slitting of the pole strip along the length direction to obtain slit pole strips, and to rewind the slit pole strips to obtain cylindrical short rolls.

[0118] The burr detection unit 402 is used to control the burr length of the cylindrical short roll end surface and determine the typical length of the burr.

[0119] The coating control unit 403 is used to determine the target coating thickness detection according to the typical length characteristics, and control the coating of the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

[0120] In some embodiments, before applying the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness, the coating control unit 403 is further used to wind an anti-spraying protective layer on the circumferential surface of the cylindrical short roll.

[0121] In some embodiments, the coating control unit 403 first determines the coating amount of the insulating coating solution according to the target coating thickness, then controls the coating of the insulating coating solution on the end surface of the cylindrical short roll according to the coating amount, and finally controls the insulating coating solution to be dried to form an insulating coating with a thickness of the target coating thickness.

[0122] In some embodiments, the coating control unit 403 is also used to determine the coating performance parameters of the insulating coating solution before determining the coating amount of the insulating coating solution according to the target coating thickness, and then determines the coating amount of the insulating coating solution according to the target coating thickness and the coating performance parameters.

[0123] In some embodiments, the coating control unit 403 determines the number of coatings and the coating percentage of each coating, then determines the fractional coating amount of each coating according to the coating amount and the coating percentage, and finally coats the insulating coating solution on the end surface of the cylindrical short roll one by one according to the fractional coating amount.

[0124] In some embodiments, the coating control unit 403 is also used to determine the coating interval length based on the corresponding portioned coating amounts in the previous two adjacent coatings; in the process of controlling the coating of the insulating coating solution on the end surface of the cylindrical short roll one by one according to the portioned coating amounts, the coating control unit 403 controls to execute the next coating operation after the coating interval length has passed after the previous coating.

[0125] In some embodiments, the coating control unit 403 controls the cylindrical short roll to rotate around its own horizontal axis during the process of coating the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

[0126] In some embodiments, the burr detection unit 402 detects the length of the burrs on the end surface of the cylindrical short roll to determine multiple burr lengths; then obtains the mean and mean square error of the multiple burrs, and determines the typical length based on the mean and mean square error.

[0127] The embodiments of the present disclosure also provide a control device, which includes a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, corresponding production equipment can be controlled to implement the electrode plate production method of any of the above embodiments.

[0128] Figure 5 Schematic diagram of the structure of the control device provided by the embodiment of the present disclosure. Figure 5 , which shows a structural schematic diagram of a control device 500 suitable for implementing the embodiments of the present disclosure. Figure 5 The control device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0129] like Figure 5 As shown, the control device 500 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory ROM 502 or a program loaded from a storage device 508 to a random access memory RAM 503. In the RAM 503, various programs and data required for the operation of the control device 500 are also stored. The processing device 501, the ROM 502, and the RAM 503 are connected to each other via a bus 504. An input / output I / O interface 505 is also connected to the bus 504.

[0130] Typically, the following devices may be connected to the I / O interface 505: input devices 506 including, for example, a touch screen, a touch pad, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 508 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 509. The communication devices 509 may allow the control device 500 to communicate with other devices wirelessly or by wire to exchange data. Although Figure 5 The control device 500 is shown with various devices, but it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have instead.

[0131] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device 509, or installed from a storage device 508, or installed from a ROM 502. When the computer program is executed by the processing device 501, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0132] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0133] In some embodiments, the client and the server may communicate using any currently known or future developed network protocol such as HTTP (Hypertext Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or future developed network.

[0134] The computer-readable medium may be included in the control device, or may exist independently without being assembled into the control device.

[0135] The above-mentioned computer-readable medium carries one or more programs. When the above-mentioned one or more programs are executed by the control device, the control device is enabled to: slit the pole strip along the length direction to obtain slit pole strips, and rewind the slit pole strips to obtain cylindrical short rolls; measure the burr length of the end surface of the cylindrical short roll to determine the typical length of the burr; determine the target coating thickness based on the typical length characteristics, and apply the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

[0136] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated system based on hardware that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0137] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0138] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0139] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection according to one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0140] The embodiments of the present disclosure also provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method of any of the above method embodiments can be implemented. The execution method and beneficial effects are similar and will not be repeated here.

[0141] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0142] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing an electrode sheet, characterized in that: include: The pole strip is cut along the length direction to obtain cut pole strips, and the cut pole strip is rewound to obtain cylindrical short rolls; Performing burr length detection on the end surface of the cylindrical short coil to determine the typical length of the burr; A target coating thickness is determined according to the typical length, and an insulating coating is applied to the end surface of the cylindrical short roll according to the target coating thickness.

2. The method according to claim 1, characterized in that Before applying the insulating coating on the end surface of the cylindrical short roll according to the target coating thickness, the method further comprises: An anti-spraying protective layer is wound on the circumferential surface of the cylindrical short roll.

3. The method according to claim 1, characterized in that The step of applying an insulating coating on the end surface of the cylindrical short roll according to the target coating thickness comprises: Determining a coating amount of the insulating coating solution according to the target coating thickness; Applying the insulating coating solution on the end surface of the cylindrical short roll according to the coating amount; The insulating coating solution is dried to form an insulating coating having a thickness equal to the target coating thickness.

4. The method according to claim 3, characterized in that Before determining the coating amount of the insulating coating solution according to the target coating thickness, the method further includes: Determining coating performance parameters of the insulating coating solution; Determining the coating amount of the insulating coating solution according to the target coating thickness includes: determining the coating amount of the insulating coating solution according to the target coating thickness and the coating performance parameter.

5. The method according to claim 3, characterized in that: Also includes: Determine the number of coatings and the coating percentage of each coating; The step of coating the insulating coating solution on the end surface of the cylindrical short roll according to the coating amount comprises: Determining the coating amount of each coating according to the coating amount and the coating percentage; The insulating coating solution is applied successively on the end surface of the cylindrical short roll according to the divided coating amounts.

6. The method according to claim 5, characterized in that Also includes: Determine the coating interval length according to the corresponding divided coating amounts in the previous two adjacent coatings; The insulating coating solution is successively coated on the end surface of the cylindrical short roll according to the divided coating amounts, including: after the previous coating is performed, the next coating operation is performed after the coating interval time.

7. The method according to any one of claims 1 to 6, characterized in that: In the process of applying an insulating coating on the end surface of the cylindrical short roll according to the target coating thickness, the process further includes: The cylindrical short coil is controlled to rotate about its own horizontal axis.

8. The method according to any one of claims 1 to 6, characterized in that: The burr length detection is performed on the end surface of the cylindrical short roll to determine the typical length of the burr located on the end surface of the short roll; Performing length detection on the burrs on the end surface of the cylindrical short roll to determine multiple burr lengths; The mean value and the mean square error of the plurality of burr lengths are obtained, and the typical length is determined according to the mean value and the mean square error.

9. An electrode sheet production control device, characterized in that: include: A slitting control unit, used for controlling the slitting of the pole strip along the length direction to obtain slit pole strips, and rewinding the slit pole strips to obtain cylindrical short rolls; A burr detection unit, used for controlling the burr length detection on the end surface of the cylindrical short roll to determine the typical length of the burr; A coating control unit is used to determine a target coating thickness according to the typical length, and to apply an insulating coating on the end surface of the cylindrical short roll according to the target coating thickness.

10. A control device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the corresponding execution device is controlled to implement the electrode plate production method as described in any one of claims 1-8.

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