Method for coating edges of pole pieces and pole piece manufacturing apparatus

Abstract

The application provides a polar piece edge gluing method and a polar piece manufacturing device. The polar piece edge gluing method comprises the following steps: cutting a polar piece into a plurality of sub-polar pieces; and coating insulating glue on the cutting edges of the sub-polar pieces to form insulating layers on the cutting surfaces of the cutting edges. The polar piece prepared according to the technical scheme of the application can improve the reliability of a battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a method for coating the edge of an electrode and an electrode manufacturing apparatus. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Battery reliability is a crucial factor in battery manufacturing. Therefore, improving battery reliability is a pressing technical challenge in battery technology. Summary of the Invention

[0004] This application provides a method for coating the edge of an electrode sheet and an electrode sheet manufacturing apparatus, the resulting electrode sheet being able to improve the reliability of the battery.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a method for coating an electrode edge, comprising: cutting the electrode into multiple sub-electrodes; and coating the cut edges of the sub-electrodes with insulating adhesive to form an insulating layer on the cut surface of the cut edges.

[0007] According to the electrode edge coating method of this application, an insulating layer is formed on the cutting surface of the sub-electrode by coating an insulating adhesive on the cutting edge of the sub-electrode. The insulating layer can at least cover the current collector and the burrs generated after the current collector is cut. That is, the insulating layer covers the current collector and part of the active material layer in the thickness direction of the sub-electrode, thereby shielding the current collector and the burrs generated after the current collector is cut. The insulating layer has a good insulating effect. After the electrode forms a battery cell, the risk of internal short circuit caused by burrs piercing the separator is reduced because the burrs are shielded by the insulating layer, thus enabling the battery cell to have high reliability.

[0008] According to some embodiments of this application, the thickness of the sub-electrode is W1, and the dimension of the insulating layer in the thickness direction of the sub-electrode is W2, satisfying 0.4≤W2 / W1≤0.6.

[0009] In the above scheme, the dimension of the insulating layer in the thickness direction of the sub-electrode satisfies the aforementioned relationship with the thickness of the sub-electrode. After the insulating layer covers the current collector, it also covers part of the active material layer. If the dimension of the insulating layer in the thickness direction of the sub-electrode is large, it is easy to coat the surface of the electrode in the thickness direction. That is, the insulating adhesive is likely to extend beyond the edge of the cutting surface and coat the surface of the active material layer away from the current collector, affecting the assembly of the electrode with other components. For example, increasing the thickness of the electrode results in a larger gap after the electrode assembly is formed, which on the one hand affects the energy density, and on the other hand, easily causes lithium plating in lithium-ion batteries. If the dimension of the insulating layer in the thickness direction of the sub-electrode is small, the burr shielding effect is poor, and burrs are easily exposed.

[0010] According to some embodiments of this application, 0.45 ≤ W2 / W1 ≤ 0.55.

[0011] In the above scheme, compared with W2 / W1<0.45, when W2 / W1≥0.45, the insulating layer has a better shielding effect on burrs, reducing the risk of burrs being exposed; compared with W2 / W1>0.55, when W2 / W1≤0.55, the insulating layer occupies a smaller dimension in the thickness direction of the sub-electrode, reducing the risk of the insulating layer extending beyond the edge of the active material layer, and reducing the impact of the insulating layer on the assembly of the electrode and other components.

[0012] According to some embodiments of this application, the step of applying insulating adhesive to the slit edge of the sub-electrode includes: applying insulating adhesive to the slit surface of the slit edge through the nozzle of the adhesive applicator.

[0013] In the above solution, insulating adhesive is applied to the cutting edge through a nozzle, which is convenient to operate and makes it easy to control the amount of insulating adhesive adhering to the cutting surface.

[0014] According to some embodiments of this application, before the adhesive nozzle of the adhesive applicator applies insulating adhesive to the slitting surface of the slitting edge, the electrode edge adhesive application method further includes: adjusting at least one of the following parameters to control the coarseness of the insulating adhesive on the slitting edge: the relative moving speed between the adhesive nozzle and the sub-electrode; the viscosity of the insulating adhesive extruded by the adhesive nozzle; the size of the outlet of the adhesive nozzle; and the amount of adhesive dispensed by the adhesive nozzle per unit time.

[0015] In the above scheme, the fineness of the insulating adhesive on the slit edge can be determined by at least one of the following: "relative moving speed between the nozzle and the sub-electrode," "viscosity of the insulating adhesive extruded from the nozzle," "size of the nozzle outlet," and "dispensing amount per unit time of the nozzle." Adjusting at least one of these parameters can control the fineness of the insulating adhesive on the slit edge to meet the requirement of the insulating layer covering burrs. For example, under the same conditions, in an embodiment where the nozzle is stationary and the sub-electrode is moving, the faster the sub-electrode moves, the finer the insulating adhesive applied by the nozzle to the slit edge. As another example, adjusting the viscosity of the insulating material extruded from the nozzle can change the fineness of the extruded insulating material, thereby controlling the fineness of the insulating adhesive on the slit edge; under the same conditions, a higher viscosity results in poorer flowability, a coarser insulating adhesive extruded from the nozzle, and a coarser insulating adhesive applied by the nozzle to the slit edge. As another example, under the same conditions, a larger nozzle outlet results in a coarser insulating adhesive applied by the nozzle to the slit edge. For example, under the same conditions, the greater the amount of adhesive dispensed per unit time by the nozzle, the coarser the insulating adhesive applied to the slitting edge.

[0016] According to some embodiments of this application, before applying insulating adhesive to the slit edge of the sub-electrode, the method of applying adhesive to the edge of the electrode further includes: adjusting the distance between the nozzle of the adhesive applicator and the slit surface, wherein the distance between the nozzle and the slit surface is H, satisfying 0.1mm≤H≤2mm.

[0017] In the above scheme, adjusting the distance between the nozzle and the slitting surface facilitates the adhesion of the insulating adhesive to the slitting edge, reducing the difficulty of applying the adhesive. If H is small (e.g., less than 0.1 mm), the coating is more difficult, and the nozzle is prone to interference with the sub-electrode; if H is large (e.g., greater than 2 mm), the insulating adhesive is not easy to adhere to the slitting surface.

[0018] According to some embodiments of this application, 0.15mm ≤ H ≤ 0.3mm.

[0019] In the above scheme, compared with H < 0.15mm, when H ≥ 0.15mm, the coating of insulating adhesive is less difficult and easier to operate; compared with H > 0.3mm, when H ≤ 0.3mm, the thickness of insulating adhesive on the cutting surface is larger and the effect of concealing burrs is smaller.

[0020] According to some embodiments of this application, the insulating adhesive includes one of photosensitive adhesive and insulating ceramic adhesive.

[0021] In the above solutions, photosensitive adhesive and insulating ceramic adhesive have better insulation effects.

[0022] Secondly, embodiments of this application also provide an electrode manufacturing apparatus, including a slitting device and an adhesive coating device. The slitting device is used to slit the electrode into multiple sub-electrodes; the adhesive coating device is used to coat the slitting surfaces of the sub-electrodes with insulating adhesive at the slitting edges to form an insulating layer that at least covers the current collector of the sub-electrodes and the burrs generated after the current collector is cut.

[0023] According to the electrode manufacturing equipment of this application embodiment, the electrode is cut into multiple sub-electrodes by a slitting device to improve the preparation efficiency; an insulating adhesive is applied to the slitting surface by a coating device to form an insulating layer that at least covers the current collector of the sub-electrodes and the burrs generated after the current collector is cut, so as to shield the burrs. After the electrode is made into a battery cell, the risk of burrs piercing the separator and causing internal short circuit is reduced, so that the battery cell has high reliability.

[0024] According to some embodiments of this application, the adhesive application device includes an adhesive storage container, an adhesive dispensing drive assembly, and an adhesive nozzle. The adhesive storage container is used to store insulating adhesive, and the adhesive dispensing drive assembly is used to drive the insulating adhesive in the adhesive storage container to the adhesive nozzle, so as to apply insulating adhesive to the cutting surface of the cutting edge through the adhesive nozzle.

[0025] In the above solution, the glue storage container is used to store insulating glue, which facilitates the improvement of glue application efficiency; the glue dispensing drive component can drive the insulating glue in the glue storage container to the glue nozzle, so as to apply the insulating glue to the cutting surface of the cutting edge through the glue nozzle, which facilitates the shielding of burrs generated after the current collector is cut, and the operation is convenient.

[0026] According to some embodiments of this application, the electrode manufacturing equipment further includes: a first adjustment device for adjusting the relative movement speed between the nozzle and the sub-electrode to control the coarseness of the insulating adhesive on the slitting edge.

[0027] In the above scheme, the first adjustment device is used to adjust the relative moving speed between the nozzle and the sub-electrode. Under the same conditions, when the nozzle does not move relative to the sub-electrode, the faster the sub-electrode moves, the finer the insulating adhesive applied by the nozzle to the cutting edge.

[0028] According to some embodiments of this application, the electrode manufacturing equipment further includes: a second adjustment device for adjusting the viscosity of the insulating adhesive extruded from the nozzle, so as to control the fineness of the insulating adhesive on the slitting edge.

[0029] In the above scheme, the second adjustment is used to adjust the viscosity of the insulating material extruded from the nozzle, which can change the coarseness of the insulating material extruded from the nozzle, thereby controlling the coarseness of the insulating adhesive on the slitting edge; under the same conditions, the higher the viscosity, the worse the flowability, the coarser the insulating adhesive extruded from the nozzle, and the coarser the insulating adhesive coated on the slitting edge by the nozzle.

[0030] According to some embodiments of this application, the electrode manufacturing equipment further includes: a third adjustment device for adjusting the size of the nozzle outlet to control the coarseness of the insulating adhesive on the slitting edge.

[0031] In the above scheme, the third adjustment device is used to adjust the size of the nozzle outlet. Under the same conditions, the larger the nozzle outlet, the thicker the insulating adhesive applied by the nozzle to the cutting edge.

[0032] According to some embodiments of this application, the electrode manufacturing equipment further includes: a fourth adjustment device for adjusting the amount of adhesive dispensed per unit time by the nozzle, so as to control the coarseness of the insulating adhesive on the slitting edge.

[0033] In the above scheme, the fourth adjustment device is used to adjust the amount of glue dispensed by the nozzle per unit time. Under the same conditions, the greater the amount of glue dispensed by the nozzle per unit time, the thicker the insulating glue applied by the nozzle to the cutting edge.

[0034] According to some embodiments of this application, the electrode manufacturing equipment further includes: a fifth adjustment device for adjusting the distance between the nozzle and the slitting surface.

[0035] In the above scheme, the fifth adjustment device is used to adjust the distance between the nozzle and the slitting surface. On the one hand, it reduces the coating difficulty and the risk of interference between the nozzle and the sub-electrode. On the other hand, it facilitates the adhesion of insulating adhesive to the slitting surface and reduces the risk of insulating adhesive falling off.

[0036] According to some embodiments of this application, the electrode manufacturing equipment further includes: a detection device for detecting the distance between the nozzle and the slitting surface, and a fifth adjustment device for adjusting the distance between the nozzle and the slitting surface based on the distance measured by the detection device.

[0037] In the above scheme, the distance between the nozzle and the slitting surface is detected by a detection device to improve the adjustment accuracy.

[0038] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic flowchart illustrating the electrode edge coating method provided in some embodiments of this application;

[0041] Figure 2 This is a schematic diagram of the electrode cutting process provided in some embodiments of this application;

[0042] Figure 3 This is a schematic diagram of the adhesive coating on the sub-electrode provided in some embodiments of this application;

[0043] Figure 4 for Figure 3 A magnified view of part A;

[0044] Figure 5 for Figure 4 A magnified view of section B;

[0045] Figure 6 for Figure 4 A magnified view of a portion at point C;

[0046] Figure 7 A schematic flowchart illustrating the electrode edge coating method provided in other embodiments of this application;

[0047] Figure 8 A schematic flowchart illustrating the electrode edge coating method provided in some embodiments of this application;

[0048] Figure 9 A schematic flowchart illustrating the electrode edge coating method provided in some embodiments of this application;

[0049] Figure 10 Schematic block diagrams of the structure of electrode manufacturing equipment provided in some embodiments of this application;

[0050] Figure 11 This is a schematic diagram of the structure of the adhesive application apparatus provided in some embodiments of this application;

[0051] Figure 12 Schematic block diagrams of the structure of electrode manufacturing equipment provided in other embodiments of this application;

[0052] Figure 13 Schematic block diagram of the structure of electrode manufacturing equipment provided in some embodiments of this application;

[0053] Figure 14 Schematic block diagram of the structure of electrode manufacturing equipment provided in some embodiments of this application;

[0054] Figure 15 Schematic block diagram of the structure of electrode manufacturing equipment provided in some embodiments of this application;

[0055] Figure 16Schematic block diagram of the structure of electrode manufacturing equipment provided in some embodiments of this application;

[0056] Figure 17 This is a flowchart illustrating a method for applying adhesive to the edge of an electrode sheet, provided in some embodiments of this application.

[0057] Icons: 1-Electrode; 10-Sub-electrode; 11-Splitting edge; 111-Splitting surface; 12-Current collector; 13-Burst; 14-Active material layer; 20-Nose; 30-Insulating adhesive; 31-Insulating layer; 100-Splitting device; 200-Adhesive application device; 21-Adhesive storage container; 22-Adhesive dispensing drive assembly; 300-First adjustment device; 400-Second adjustment device; 500-Third adjustment device; 600-Fourth adjustment device; 700-Fifth adjustment device; 800-Detection device. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0060] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0064] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0066] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0067] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0068] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0069] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0070] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0071] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0072] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0073] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0075] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0076] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0077] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0078] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0079] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0080] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0081] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0082] In some implementations, the electrode assembly is a stacked structure.

[0083] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0084] The development of battery technology must take into account multiple design factors, such as energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0085] In battery manufacturing, electrodes are typically continuous strip structures. The processing steps for electrodes include a slitting process, during which the electrode can be cut into multiple sub-electrodes, resulting in high production efficiency. Currently, during electrode slitting, the upper and lower cutting blades interlock tightly, leading to wear and tear at the interlocking points, causing the blades to become dull and chipped. In battery manufacturing, different material formulations and process requirements, as well as varying electrode coating conditions (such as post-coating or thin coating), can cause metal burrs to form on the slitting edges. Oversized metal burrs on the slitting edges can puncture the separator after the battery cell is formed, causing internal short circuits and affecting the reliability of the battery cell.

[0086] In view of this, this application provides a method for coating the edge of an electrode sheet. After the electrode sheet is cut into multiple sub-electrodes, insulating adhesive is coated on the cut edges of the sub-electrodes to form an insulating layer on the cut surface, thereby improving the reliability of the battery cell.

[0087] The electrode sheet prepared by the above-mentioned electrode edge coating method has an insulating layer formed on the cutting surface of the cutting edge. The insulating layer covers the current collector and part of the active material layer in the thickness direction of the sub-electrode sheet, so as to shield the current collector and the burrs generated after the current collector is cut. After the electrode sheet is used to form an electrode assembly, since the burrs are shielded by the insulating layer, the insulating layer has a good insulation effect, which can reduce the risk of burrs piercing the separator and causing internal short circuit, thereby enabling the battery cell to have high reliability.

[0088] Please refer to Figures 1 to 6 , Figure 1 This is a schematic flowchart illustrating the electrode edge coating method provided in some embodiments of this application. Figure 2 This is a schematic diagram of the electrode cutting process provided in some embodiments of this application. Figure 3 This is a schematic diagram of the adhesive coating on the sub-electrode provided in some embodiments of this application. Figure 4 for Figure 3 A magnified view of part A. Figure 5 for Figure 4 A magnified view of part B. Figure 6 for Figure 4 A magnified view of a portion at point C. This application provides a method for coating the edge of an electrode sheet, including:

[0089] S110, the electrode 1 is divided into multiple sub-electrodes 10;

[0090] S120, an insulating adhesive 30 is applied to the slit edge 11 of the sub-electrode 10 to form an insulating layer 31 on the slit surface 111 of the slit edge 11.

[0091] The electrode 1 is a continuous strip structure. After the electrode 1 is cut, it can form multiple sub-electrodes 10. The multiple sub-electrodes 10 are also called electrode 1. That is, the sub-electrodes 10 are the electrode 1 that constitutes the electrode assembly.

[0092] During the preparation of electrode 1, electrode 1 is in a rolled shape and is wound around an unwinding roller. In step "S110, slit electrode 1 into multiple sub-electrodes 10", the rolled electrode 1 is fed to the slitting station, the electrode 1 is unwound, and electrode 1 is slit into multiple sub-electrodes 10.

[0093] When cutting electrode 1, it can be cut into two sub-electrodes 10, three sub-electrodes 10, or more than three sub-electrodes 10, depending on the requirements.

[0094] After the electrode 1 is cut into multiple sub-electrodes 10, the sub-electrodes 10 can be wound up to form an electrode roll. The electrode roll is moved to the adhesive coating station, the electrode roll is unwound, and step "S120, apply insulating adhesive 30 to the cut edge 11 of the sub-electrodes 10" is executed.

[0095] Before performing step "S120, applying insulating adhesive 30 to the slit edge 11 of the sub-electrode 10", the sub-electrode 10 is tensioned to facilitate the application of insulating adhesive 30 to the slit edge 11 of the sub-electrode 10.

[0096] In this process, insulating adhesive 30 is applied to the slit edge 11 of the sub-electrode 10. The application method can be either extrusion or spraying. For example, in some embodiments, the insulating adhesive can be extruded through the nozzle of an adhesive applicator to apply the insulating adhesive 30 to the slit edge 11 of the sub-electrode 10. In other embodiments, the insulating adhesive 30 can also be sprayed onto the slit edge 11 of the sub-electrode 10 through the nozzle of an adhesive applicator.

[0097] When applying insulating adhesive 30, the sub-electrode 10 can move while the adhesive applicator remains stationary, and the adhesive applicator extrudes the insulating adhesive 30 so that the insulating adhesive 30 is applied to the cutting edge 11 as the sub-electrode 10 moves; alternatively, the adhesive applicator can move while the sub-electrode 10 remains stationary, and the adhesive applicator applies the insulating adhesive 30 to the cutting edge 11 of the stationary sub-electrode 10; or both the sub-electrode 10 and the adhesive applicator can move, and the adhesive applicator applies the insulating adhesive 30 to the cutting edge 11 of the sub-electrode 10.

[0098] In the figure, the direction indicated by the letter Z can be the thickness direction of the sub-electrode 10, which is parallel to the thickness direction of the current collector 12.

[0099] The sub-electrode 10 includes a current collector 12 and an active material layer 14 attached to the surface of the current collector 12 in the thickness direction. When the current collector 12 is cut, the burrs 13 generated after the current collector 12 is cut can be distributed on both sides of the current collector 12 in the thickness direction Z of the sub-electrode 10. That is, when viewed along the direction perpendicular to the cutting surface 111 of the cutting edge 11, the burrs 13 can partially overlap with the active material layer 14.

[0100] In step "S120, applying insulating adhesive 30 to the slit edge 11 of the sub-electrode 10", when the insulating adhesive 30 is applied to the slit surface 111 of the slit edge 11, the insulating adhesive 30 covers at least the current collector 12 and the burrs 13 generated after the current collector 12 is cut. In the thickness direction of the sub-electrode 10, the insulating adhesive 30 covers the current collector 12 and at least part of the active material layer 14, so that the insulating layer 31 formed after the insulating adhesive 30 solidifies can cover the current collector 12 and the burrs 13 generated after the current collector 12 is cut.

[0101] According to the electrode edge coating method of this application embodiment, by coating the cutting edge 11 of the sub-electrode 10 with insulating adhesive 30, an insulating layer 31 is formed on the cutting surface 111 of the cutting edge 11, which at least covers the current collector 12 and the burrs 13 generated after the current collector 12 is cut. That is, the insulating layer 31 covers the current collector 12 and part of the active material layer 14 in the thickness direction of the sub-electrode 10, so as to shield the current collector 12 and the burrs 13 generated after the current collector 12 is cut. The insulating layer 31 has a good insulation effect. After the electrode 1 forms a battery cell, since the burrs 13 are shielded by the insulating layer 31, the risk of the burrs 13 piercing the separator and causing an internal short circuit can be reduced, thereby enabling the battery cell to have high reliability.

[0102] Please refer to Figure 5 According to some embodiments of this application, the thickness of the sub-electrode 10 is W1, and the dimension of the insulating layer 31 in the thickness direction of the sub-electrode 10 is W2, satisfying 0.4≤W2 / W1≤0.6.

[0103] W2 / W1 refers to the ratio of the dimension of the insulating layer 31 in the thickness direction of the sub-electrode 10 to the thickness of the sub-electrode 10.

[0104] Optionally, W2 / W1 may be, but is not limited to, 0.4, 0.41, 0.42, 0.45, 0.5, 0.51, 0.52, 0.55, 0.59 or 0.6.

[0105] If W2 / W1 is large (e.g., W2 / W1 > 0.6), the insulating layer 31 will have a larger dimension in the thickness direction of the sub-electrode 10, making it easier to coat onto the surface of the electrode 1 in the thickness direction. That is, the insulating adhesive 30 will easily extend beyond the edge of the cutting surface 111 and be coated onto the surface of the active material layer 14 away from the current collector 12, affecting the assembly of the electrode 1 with other components. For example, increasing the thickness of the electrode 1 will result in a larger gap after the electrode assembly is formed, which will affect the energy density on the one hand, and easily cause lithium plating in lithium-ion batteries on the other hand.

[0106] If W2 / W1 is small (e.g., W2 / W1 < 0.4), the size of the insulating layer 31 in the thickness direction of the sub-electrode 10 is small, and the shielding effect on the burrs 13 is poor, making it easy for the burrs 13 to be exposed.

[0107] The dimension of the insulating layer 31 in the thickness direction of the sub-electrode 10 satisfies the above relationship with the thickness of the sub-electrode 10 (0.4≤W2 / W1≤0.6). After the insulating layer 31 covers the current collector 12, the insulating layer 31 also covers part of the active material layer 14.

[0108] According to some embodiments of this application, 0.45 ≤ W2 / W1 ≤ 0.55.

[0109] Optionally, W2 / W1 may be, but is not limited to, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, etc.

[0110] Compared to W2 / W1 < 0.45, when W2 / W1 ≥ 0.45, the insulating layer 31 has a better shielding effect on the burrs 13, reducing the risk of the burrs 13 being exposed; compared to W2 / W1 > 0.55, when W2 / W1 ≤ 0.55, the insulating layer 31 occupies a smaller dimension in the thickness direction of the sub-electrode 10, reducing the risk of the insulating layer 31 extending beyond the edge of the active material layer 14, and reducing the impact of the insulating layer 31 on the assembly of the electrode 1 with other components.

[0111] Please refer to Figure 7 , Figure 7 This is a schematic flowchart illustrating a method for applying adhesive to the edge of an electrode sheet according to other embodiments of this application. According to some embodiments of this application, applying insulating adhesive 30 to the slit edge 11 of the sub-electrode sheet 10 includes:

[0112] S121, insulating adhesive 30 is applied to the cutting surface 111 of the cutting edge 11 by the adhesive nozzle 20 of the adhesive applicator, so as to form an insulating layer 31 on the cutting surface 111 of the cutting edge 11.

[0113] In the step of “applying insulating adhesive 30 to the cutting surface 111 of the cutting edge 11 by means of the adhesive nozzle 20 of the adhesive applicator”, the insulating adhesive 30 can be extruded through the adhesive nozzle 20 by extrusion to form a continuous filament of adhesive, so as to form an insulating layer 31 on the cutting surface 111 of the cutting edge 11. The insulating layer 31 at least covers the current collector 12 of the sub-electrode 10 and the burrs 13 generated after the current collector 12 is cut.

[0114] Applying insulating adhesive 30 to the cutting edge 11 via the nozzle 20 is convenient and allows for easy control of the amount of insulating adhesive 30 adhering to the cutting surface 111.

[0115] In some embodiments, insulating adhesive 30 may also be manually applied to the slit edge 11 of the sub-electrode 10.

[0116] Please refer to Figure 8 , Figure 8 This is a schematic flowchart illustrating a method for applying adhesive to the edge of an electrode sheet according to some embodiments of this application. According to some embodiments of this application, before applying insulating adhesive 30 to the cutting surface 111 of the cutting edge 11 via the nozzle 20 of the adhesive applicator, the method for applying adhesive to the edge of the electrode sheet further includes:

[0117] S120a, adjust at least one of the following parameters to control the coarseness of the insulating adhesive 30 on the cutting edge 11:

[0118] The relative moving speed between the nozzle 20 and the sub-electrode 10;

[0119] The viscosity of the insulating adhesive 30 extruded from nozzle 20;

[0120] The size of the nozzle 20's outlet;

[0121] The amount of glue dispensed by the nozzle in 20 units of time.

[0122] The coarseness of the insulating adhesive 30 on the slit edge 11 refers to the size of the insulating adhesive 30 attached to the slit surface 111 in the thickness direction of the sub-electrode sheet 10.

[0123] The fineness of the insulating adhesive 30 on the slit edge 11 can be determined by at least one of the following: "relative moving speed between the nozzle 20 and the sub-electrode 10", "viscosity of the insulating adhesive 30 extruded by the nozzle 20", "size of the nozzle 20 outlet", and "adhesive output per unit time of the nozzle 20". Adjusting at least one of the above parameters can control the fineness of the insulating adhesive 30 on the slit edge 11 to meet the requirement of the insulating layer 31 to cover the burrs 13.

[0124] For example, under the same conditions, in an embodiment where the nozzle 20 is stationary and the sub-electrode 10 is moving, the faster the sub-electrode 10 moves, the finer the insulating adhesive 30 applied by the nozzle 20 to the slit edge 11 becomes.

[0125] For example, adjusting the viscosity of the insulating material extruded by the nozzle 20 can change the thickness of the insulating material extruded by the nozzle 20, thereby controlling the thickness of the insulating adhesive 30 on the slitting edge 11. Under the same conditions, the higher the viscosity, the worse the flowability, the coarser the insulating adhesive 30 extruded by the nozzle 20, and the coarser the insulating adhesive 30 coated by the nozzle 20 on the slitting edge 11.

[0126] For example, under the same conditions, the larger the outlet of the nozzle 20, the coarser the insulating adhesive 30 applied by the nozzle 20 to the cutting edge 11.

[0127] For example, under the same conditions, the greater the amount of adhesive dispensed by the nozzle 20 per unit time, the coarser the insulating adhesive 30 applied by the nozzle 20 to the slitting edge 11.

[0128] Please refer to Figure 9 , Figure 9 This is a schematic flowchart illustrating a method for applying adhesive to the edge of an electrode sheet according to some embodiments of this application. According to some embodiments of this application, before applying insulating adhesive 30 to the slit edge 11 of the sub-electrode sheet 10, the method for applying adhesive to the edge of the electrode sheet further includes:

[0129] S120b, Adjust the distance between the glue nozzle 20 of the glue applicator and the slitting surface 111, wherein the distance between the glue nozzle 20 and the slitting surface 111 is H, which satisfies 0.1mm≤H≤2mm.

[0130] Before the step "applying insulating adhesive 30 to the slit edge 11 of the sub-electrode 10", the distance between the nozzle 20 of the adhesive applicator and the slit surface 111 is adjusted; the step "applying insulating adhesive 30 to the slit edge 11 of the sub-electrode 10" includes applying insulating adhesive 30 to the slit surface 111 of the slit edge 11 through the nozzle 20.

[0131] Optionally, H may be, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.5mm, 1mm, 1.1mm, 1.2mm, 1.5mm, 1.9mm, 2mm, etc.

[0132] If H is small (e.g., less than 0.1 mm), coating is difficult, and the nozzle 20 is prone to interference with the sub-electrode 10; if H is large (e.g., greater than 2 mm), the insulating adhesive 30 is not easy to adhere to the slitting surface 111. Adjusting the distance between the nozzle 20 and the slitting surface 111 to meet the above relationship (0.1 mm ≤ H ≤ 2 mm) facilitates the adhesion of the insulating adhesive 30 to the slitting surface 111 of the slitting edge 11, reducing the difficulty of coating.

[0133] According to some embodiments of this application, 0.15mm ≤ H ≤ 0.3mm.

[0134] Compared to H < 0.15 mm, when H ≥ 0.15 mm, the coating of insulating adhesive 30 is less difficult and easier to operate; compared to H > 0.3 mm, when H ≤ 0.3 mm, the thickness of insulating adhesive 30 on the cutting surface 111 is larger, and the effect of concealing burrs 13 is smaller.

[0135] Optionally, H may be, but is not limited to, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, etc.

[0136] According to some embodiments of this application, the electrode edge coating method further includes:

[0137] The movement posture of the sub-electrode 10 is controlled to control the distance between the nozzle 20 and the slitting surface 111.

[0138] The movement attitude of the sub-electrode 10 includes the movement position of the sub-electrode 10 and the angle with the preset direction. Controlling the movement attitude of the sub-electrode 10 means correcting the sub-electrode 10 and adjusting the offset of the sub-electrode 10.

[0139] When the sub-electrode 10 moves, it is in a tensioned state, and the movement trajectory of the sub-electrode 10 is a straight line, so that the insulating adhesive 30 extruded by the nozzle 20 can be coated on the slitting surface 111.

[0140] In the step of "controlling the movement posture of the sub-electrode 10", the offset of the sub-electrode 10 can be controlled by the correction device to control the movement posture of the sub-electrode 10, so that the distance between the cutting surface 111 and the nozzle 20 is within a preset range.

[0141] According to some embodiments of this application, the insulating adhesive 30 includes one of photosensitive adhesive and insulating ceramic adhesive.

[0142] Photosensitive adhesives, also known as shadowless adhesives or ultraviolet-cured adhesives, are a type of adhesive that cures under ultraviolet light. Photosensitive adhesives have good insulation properties and corrosion resistance. They consist of photosensitive resins, sensitizers, crosslinking agents, photosensitizers (photoinitiators), stabilizers, and solvents.

[0143] Insulating ceramic adhesive is a functional material containing resin and ceramic components. It has stable high-temperature insulation properties and good thermal conductivity.

[0144] In the above solutions, photosensitive adhesive and insulating ceramic adhesive have good insulation effects and corrosion resistance.

[0145] Please refer to the reference. Figures 2 to 6 And further refer to 10, Figure 10 This is a schematic block diagram illustrating the structure of an electrode manufacturing apparatus provided in some embodiments of this application. According to some embodiments of this application, an electrode manufacturing apparatus is also provided for performing the electrode edge coating method provided in any of the above embodiments. The electrode manufacturing apparatus includes a slitting device 100 and a coating device 200. The slitting device 100 is used to slit the electrode 1 into a plurality of sub-electrodes 10; the coating device 200 is used to coat the slitting surface 111 of the slitting edge 11 of the sub-electrodes 10 with insulating adhesive 30 to form an insulating layer 31 that at least covers the current collector 12 of the sub-electrodes 10 and the burrs 13 generated after cutting the current collector 12.

[0146] The slitting device 100 is a device for slitting the electrode 1 into a plurality of sub-electrodes 10. The slitting device 100 may include an upper cutter and a lower cutter, which engage to cut the electrode 1.

[0147] The adhesive applicator 200 is an apparatus for applying insulating adhesive 30 to the slit surface 111 of the slit edge 11 of the sub-electrode 10.

[0148] According to the electrode manufacturing equipment of this application embodiment, the electrode 1 is slit into multiple sub-electrodes 10 by the slitting device 100, thereby improving the preparation efficiency; the insulating adhesive 30 is coated on the slitting surface 111 by the coating device 200 to form an insulating layer 31 that at least covers the current collector 12 of the sub-electrodes 10 and the burrs 13 generated after the current collector 12 is cut, so as to shield the burrs 13. After the electrode 1 is formed into a battery cell, the risk of the burrs 13 piercing the separator and causing an internal short circuit can be reduced, so that the battery cell has high reliability.

[0149] Please refer to Figure 11 , Figure 11 This is a schematic diagram of the structure of an adhesive application apparatus provided in some embodiments of this application. According to some embodiments of this application, the adhesive application apparatus 200 includes an adhesive storage container 21, an adhesive dispensing drive assembly 22, and an adhesive nozzle 20. The adhesive storage container 21 is used to store insulating adhesive 30, and the adhesive dispensing drive assembly 22 is used to drive the insulating adhesive 30 in the adhesive storage container 21 to the adhesive nozzle 20, so as to apply the insulating adhesive 30 to the cutting surface 111 of the cutting edge 11 through the adhesive nozzle 20.

[0150] The adhesive storage container 21 can be a glue bucket to facilitate the storage of insulating adhesive 30. The adhesive storage container 21 has a certain capacity to meet the adhesive application requirements.

[0151] In some embodiments, the glue storage container 21 is provided with a glue quantity balance detection device to detect the amount of insulating glue 30 in the glue storage container 21.

[0152] The dispensing drive assembly 22 is used to provide dispensing driving force to expel the insulating adhesive 30 from the nozzle 20. In some embodiments, the dispensing drive assembly 22 may include a piston and a cylinder.

[0153] In the above scheme, the glue storage container 21 is used to store insulating glue 30, which facilitates the improvement of glue application efficiency; the glue dispensing drive assembly 22 can drive the insulating glue 30 in the glue storage container 21 to the glue nozzle 20, so as to apply the insulating glue 30 to the cutting surface 111 of the cutting edge 11 through the glue nozzle 20, which facilitates the shielding of the burrs 13 generated after the current collector 12 is cut, and the operation is convenient.

[0154] According to some embodiments of this application, the dispensing port of the nozzle 20 corresponds to the slitting surface 111 of the sub-electrode 10.

[0155] According to some embodiments of this application, the dispensing direction of the nozzle 20 may intersect with the slitting surface 111 of the sub-electrode 10. For example, the angle between the dispensing direction and the slitting surface 111 may be 80° to 100°. In some embodiments, the dispensing direction of the nozzle 20 may be perpendicular to the slitting surface 111 of the sub-electrode 10.

[0156] According to some embodiments of this application, the electrode manufacturing equipment further includes a driving device for driving the sub-electrode 10 to move. The driving device may include a motor, a driving roller, and a conveying roller. The driving roller is connected to the motor, and the conveying roller cooperates with the driving roller to convey the sub-electrode 10. The motor drives the driving roller to rotate, thereby moving the sub-electrode 10.

[0157] Please refer to Figure 12 , Figure 12 This is a schematic block diagram of the structure of an electrode manufacturing apparatus provided in some other embodiments of this application. According to some embodiments of this application, the electrode manufacturing apparatus further includes a first adjustment device 300, which is used to adjust the relative moving speed between the nozzle 20 and the sub-electrode 10 to control the coarseness of the insulating adhesive 30 on the slitting edge 11.

[0158] In the manufacturing process of electrode 1, in order to facilitate the coating of insulating adhesive 30 and reduce the coating difficulty, the nozzle 20 can be stationary, while the sub-electrode 10 moves relative to the nozzle 20.

[0159] The first adjustment device 300 is a device for adjusting the relative moving speed between the nozzle 20 and the sub-electrode 10.

[0160] In some embodiments, the first adjustment device 300 may include a controller electrically connected to a drive device that drives the sub-electrode 10 to move, and controls the moving speed of the sub-electrode 10 by controlling the rotational speed of the motor.

[0161] In some embodiments, the first adjustment device 300 may include a transmission, which is electrically connected to a drive device that drives the sub-electrode 10 to move. When the controller sends a speed change command, the drive device adjusts the power output by the transmission to control the moving speed of the sub-electrode 10.

[0162] In the above scheme, the first adjustment device 300 is used to adjust the relative moving speed between the nozzle 20 and the sub-electrode 10. Under the same conditions, when the nozzle 20 does not move relative to the sub-electrode 10, the faster the sub-electrode 10 moves, the finer the insulating adhesive 30 coated by the nozzle 20 on the cutting edge 11 will be.

[0163] Please refer to Figure 13 , Figure 13This is a schematic block diagram of an electrode manufacturing apparatus provided in some embodiments of this application. According to some embodiments of this application, the electrode manufacturing apparatus further includes a second adjustment device 400, which is used to adjust the viscosity of the insulating adhesive 30 extruded from the nozzle 20 to control the fineness of the insulating adhesive 30 on the slitting edge 11.

[0164] The second adjustment device 400 is a device for adjusting the viscosity of the insulating adhesive 30 extruded from the nozzle 20.

[0165] In some embodiments, the second adjusting device 400 may include a feeding assembly and a stirring assembly. The feeding assembly includes multiple feeding containers, each containing a component of the insulating adhesive 30. Each feeding container is connected to a storage container 21. The stirring assembly is used to stir the insulating adhesive 30 located in the storage container 21. When it is necessary to adjust the viscosity of the insulating adhesive 30 extruded from the nozzle 20, different feeding containers are controlled to deliver the corresponding component into the storage container 21. The stirring assembly stirs the adhesive to ensure that the components of the insulating adhesive 30 are mixed evenly, thereby changing the content of different components in the insulating adhesive 30 and thus changing the viscosity of the insulating adhesive 30.

[0166] In some embodiments, the second adjustment device 400 may include a heating component for heating the insulating adhesive 30 to adjust the viscosity of the insulating adhesive 30 extruded from the nozzle 20.

[0167] In the above scheme, the second adjustment is used to adjust the viscosity of the insulating material extruded by the nozzle 20, which can change the coarseness of the insulating material extruded by the nozzle 20, thereby controlling the coarseness of the insulating adhesive 30 on the slitting edge 11; under the same conditions, the higher the viscosity, the worse the flowability, the coarser the insulating adhesive 30 extruded by the nozzle 20, and the coarser the insulating adhesive 30 coated by the nozzle 20 on the slitting edge 11.

[0168] Please refer to Figure 14 , Figure 14 This is a schematic block diagram of an electrode manufacturing apparatus provided in some embodiments of this application. According to some embodiments of this application, the electrode manufacturing apparatus further includes a third adjustment device 500, which is used to adjust the size of the nozzle 20 outlet to control the coarseness of the insulating adhesive 30 on the slitting edge 11.

[0169] The third adjustment device 500 is a device for adjusting the size of the outlet of the nozzle 20.

[0170] In some embodiments, the third adjustment device 500 may include a blocking member and a driving member. The blocking member is used to block the outlet of the nozzle 20, and the driving member is used to drive the blocking member to move so as to change the blocking area between the blocking member and the outlet of the nozzle 20, thereby changing the size of the outlet of the nozzle 20 and changing the dispensing amount of the nozzle 20.

[0171] In the above scheme, the third adjustment device 500 is used to adjust the size of the nozzle 20 outlet. Under the same conditions, the larger the nozzle 20 outlet, the coarser the insulating adhesive 30 coated on the cutting edge 11 by the nozzle 20.

[0172] Please refer to Figure 15 , Figure 15 This is a schematic block diagram of an electrode manufacturing apparatus provided in some embodiments of this application. According to some embodiments of this application, the electrode manufacturing apparatus further includes a fourth adjustment device 600, which is used to adjust the amount of adhesive dispensed from the nozzle 20 per unit time to control the fineness of the insulating adhesive 30 on the slitting edge 11.

[0173] The fourth adjustment device 600 is a device for adjusting the amount of glue dispensed from the nozzle over 20 unit times.

[0174] In some embodiments, the fourth adjustment device 600 may include a dispensing controller for controlling the driving force of the dispensing drive assembly 22 to change the conveying speed of the insulating adhesive 30, thereby adjusting the amount of adhesive dispensed per unit time by the nozzle 20.

[0175] In the above scheme, the fourth adjustment device 600 is used to adjust the amount of glue dispensed by the nozzle 20 per unit time. Under the same conditions, the greater the amount of glue dispensed by the nozzle 20 per unit time, the coarser the insulating glue 30 coated by the nozzle 20 on the cutting edge 11.

[0176] According to some embodiments of this application, the electrode manufacturing equipment may include at least one of a first adjustment device 300, a second adjustment device 400, a third adjustment device 500, and a fourth adjustment device 600 to control the coarseness of the insulating adhesive 30 on the slitting edge 11.

[0177] Please refer to Figure 16 , Figure 16 This is a schematic block diagram of an electrode manufacturing apparatus provided in some embodiments of this application. According to some embodiments of this application, the electrode manufacturing apparatus further includes a fifth adjustment device 700, which is used to adjust the distance between the nozzle 20 and the slitting surface 111.

[0178] The fifth adjustment device 700 is a device for adjusting the distance between the nozzle 20 and the slitting surface 111.

[0179] The distance between the nozzle 20 and the slitting surface 111 can be the distance between the nozzle 20 and the slitting surface 111 in a direction perpendicular to the slitting surface 111.

[0180] In some embodiments, the fifth adjustment device 700 may include a robotic arm connected to the nozzle 20. The robotic arm can move the nozzle 20 to change the distance between the nozzle 20 and the slitting surface 111, thereby adjusting the position of the nozzle 20.

[0181] In some embodiments, the fifth adjustment device 700 may include a guide rail, a slider, an adjustment drive, and a transmission assembly. The guide rail is disposed perpendicular to the respective surface. The nozzle 20 is connected to the slider, and the slider slides in engagement with the guide rail. The adjustment drive is connected to the slider via the transmission assembly and is used to drive the slider to move along the guide rail to change the distance between the nozzle 20 and the cutting surface 111. The adjustment drive may be a motor, and the transmission assembly may be, but is not limited to, a rack and pinion transmission assembly or a lead screw and nut transmission assembly.

[0182] In the above scheme, the fifth adjustment device 700 is used to adjust the distance between the nozzle 20 and the slitting surface 111. On the one hand, it reduces the coating difficulty and the risk of interference between the nozzle 20 and the sub-electrode 10. On the other hand, it facilitates the adhesion of the insulating adhesive 30 to the slitting surface 111 and reduces the risk of the insulating adhesive 30 falling off.

[0183] Please refer to Figure 16 According to some embodiments of this application, the electrode manufacturing equipment further includes a detection device 800, which is used to detect the distance between the nozzle 20 and the slitting surface 111, and a fifth adjustment device 700 is used to adjust the distance between the nozzle 20 and the slitting surface 111 according to the distance measured by the detection device 800.

[0184] The detection device 800 is used to detect the distance between the nozzle 20 and the cutting surface 111. The detection device 800 may include a rangefinder, such as a laser rangefinder, an ultrasonic rangefinder, a CCD (Charge-coupled Device) camera, a 3D camera, etc.

[0185] The electrode manufacturing equipment also includes a control device, which includes a controller, such as a PLC (Programmable Logic Controller). The controller is electrically connected to the fifth adjustment device 700. The controller can analyze the position adjustment amount of the nozzle 20 based on the distance information detected by the detection device 800, so as to control the fifth adjustment device 700 to adjust the distance between the nozzle 20 and the slitting surface 111.

[0186] In the above scheme, the distance between the nozzle 20 and the cutting surface 111 is detected by the detection device 800 in order to improve the adjustment accuracy.

[0187] Please refer to Figure 17 , Figure 17This is a schematic flowchart illustrating a method for applying adhesive to the edge of an electrode sheet, provided in some embodiments of this application. According to some embodiments of this application, this application provides a method for applying adhesive to the edge of an electrode sheet, comprising:

[0188] S110, the electrode 1 is divided into multiple sub-electrodes 10;

[0189] S120a, adjust at least one of the following parameters to control the coarseness of the insulating adhesive 30 on the cutting edge 11: the relative moving speed between the nozzle 20 and the sub-electrode 10; the viscosity of the insulating adhesive 30 extruded from the nozzle 20; the size of the nozzle 20 outlet; the amount of adhesive extruded from the nozzle 20 per unit time.

[0190] S120b, Adjust the distance between the glue nozzle 20 of the glue applicator and the slitting surface 111;

[0191] S121, insulating adhesive 30 is applied to the cutting surface 111 of the cutting edge 11 by the adhesive nozzle 20 of the adhesive applicator to form an insulating layer 31 on the cutting surface 111 of the cutting edge 11. The insulating layer 31 at least covers the current collector 12 of the sub-electrode 10 and the burrs 13 generated after the current collector 12 is cut.

[0192] According to the technical solution provided in this application, an insulating layer 31 is formed on the cutting surface 111 that at least covers the current collector 12 of the sub-electrode 10 and the burrs 13 generated after the current collector 12 is cut. This can shield the burrs 13 and the insulating layer 31 has a good insulation effect. After forming a battery cell, it can reduce the risk of the burrs 13 piercing the separator and causing an internal short circuit, so that the battery cell has high reliability.

[0193] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for coating the edge of an electrode sheet, characterized in that, include: The electrode sheet is cut into multiple sub-electrodes; Insulating adhesive is applied to the slit edges of the sub-electrode to form an insulating layer on the slit surfaces of the slit edges; The thickness of the sub-electrode is W1, and the dimension of the insulating layer in the thickness direction of the sub-electrode is W2, satisfying 0.4≤W2 / W1<0.5, or 0.5<W2 / W1≤0.

6.

2. The electrode edge coating method according to claim 1, characterized in that, The process of applying insulating adhesive to the slit edges of the sub-electrode includes: Insulating adhesive is applied to the slitting surface at the slitting edge using the nozzle of the adhesive applicator.

3. The electrode edge coating method according to claim 2, characterized in that, Before the adhesive nozzle of the adhesive applicator applies insulating adhesive to the slitting surface of the slitting edge, the electrode edge adhesive application method further includes: Adjust at least one of the following parameters to control the coarseness of the insulating adhesive on the slit edge: The relative moving speed between the nozzle and the sub-electrode; The viscosity of the insulating adhesive extruded from the nozzle; The size of the nozzle outlet; The amount of glue dispensed per unit time from the nozzle.

4. The electrode edge coating method according to claim 1, characterized in that, Before applying insulating adhesive to the slit edge of the sub-electrode, the method for applying adhesive to the electrode edge further includes: adjusting the distance between the nozzle of the adhesive applicator and the slit surface, wherein the distance between the nozzle and the slit surface is H, satisfying 0.1mm≤H≤2mm.

5. The electrode edge coating method according to claim 4, characterized in that, 0.15mm≤H≤0.3mm.

6. The electrode edge coating method according to any one of claims 1-5, characterized in that, The insulating adhesive includes either photosensitive adhesive or insulating ceramic adhesive.

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