Extrusion coating head and coating device

Abstract

The embodiment of the utility model provides an extrusion coating head and a coating device.The extrusion coating head comprises an adjusting assembly, a first extrusion module and a second extrusion module, the first extrusion module and the second extrusion module are oppositely arranged from bottom to top, and a gap is formed between the first extrusion module and the second extrusion module to form a slurry channel; an opening, communicated with the outside, of the slurry channel is a discharging port, the adjusting assembly comprises a plurality of adjusting parts, the adjusting parts are arranged in the extending direction of the discharging port, one end of each adjusting part is used for stretching into the slurry channel, and the other end of each adjusting part is used for stretching out of the discharging port. The face, facing the second extrusion module, of the first extrusion module is provided with a first slurry cavity and a second slurry cavity in the extending direction of the discharging port, and the second slurry cavity is located between the first slurry cavity and the adjusting part. According to the extrusion coating head and the coating device provided by the embodiment of the invention, the adjustment precision is high, the uniformity of coating slurry can be ensured, and the problem of rib bulging generated during coating can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to an extrusion coating head and a coating device. Background Art

[0002] Coating is an essential process in the production of lithium-ion batteries and a key process that directly affects battery safety, capacity, consistency and other performance. Coating is to evenly, continuously or intermittently coat the prepared battery slurry on the substrate (aluminum foil or copper foil) to ensure the consistency of thickness at each coating position and control the coating thickness within the tolerance range required by the process.

[0003] There are currently two commonly used coating methods: transfer coating and extrusion coating. The extrusion coating head is a basic component commonly used in extrusion coating. In the related art, the extrusion coating head includes: a first extrusion module and a second extrusion module arranged in sequence from bottom to top in the height direction, a slurry channel is formed between the first extrusion module and the second extrusion module, and the slurry outlet of the slurry channel is used to coat the surface of the battery electrode. A slurry cavity is provided on the first extrusion module, and the slurry cavity is connected to the slurry channel. The flow area of ​​the slurry channel is adjusted by adjusting the distance between the first extrusion module and the second extrusion module, thereby adjusting the slurry flow rate to ensure the requirements of different slurry thicknesses during coating.

[0004] However, the above-mentioned extrusion coating head easily causes the problem of bulging during coating, and has low adjustment accuracy and cannot ensure the uniformity of the coating slurry. Utility Model Content

[0005] In view of the above problems, the embodiments of the present application provide an extrusion coating head and a coating device, which have high adjustment accuracy, can ensure the uniformity of the coating slurry, and can reduce the bulging problem caused by coating.

[0006] On the one hand, an embodiment of the present application provides an extrusion coating head, comprising: an adjustment component and a first extrusion module and a second extrusion module arranged opposite to each other from bottom to top, a gap being provided between the first extrusion module and the second extrusion module to form a slurry channel, an opening through which the slurry channel communicates with the outside is a discharge port, the adjustment component comprises a plurality of adjustment members, and the plurality of adjustment members are arranged along the extension direction of the discharge port, a through hole perpendicular to the slurry channel is provided on the second extrusion module, a part of the adjustment member is movably arranged up and down in the through hole, one end of the adjustment member is used to extend into the slurry channel, a first slurry cavity and a second slurry cavity are provided on a side of the first extrusion module facing the second extrusion module along the extension direction of the discharge port, the first slurry cavity is used to communicate with an external slurry conveying system, the first slurry cavity and the second slurry cavity are both communicated with the slurry channel, and the second slurry cavity is located between the first slurry cavity and the adjustment member.

[0007] The extrusion coating head provided in the embodiment of the present application can adjust the slurry flow rate through the adjusting member, which is conducive to improving the uniformity of the slurry thickness in each area on the battery pole piece, and the adjustment accuracy is high, ensuring that the electrode assembly formed by the battery pole piece has good safety and chemical properties, and can also save slurry and reduce the manufacturing cost of the electrode assembly. The adjusting member can also reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid straight-through, and reduce the risk of bulging during coating. The second slurry chamber can also effectively reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid straight-through, and thus greatly reduce the risk of bulging during coating. In addition, the second slurry chamber is located between the first slurry chamber and the adjusting member. Compared with the second slurry chamber being located directly below the adjusting member or the second slurry chamber being located between the adjusting member and the discharge port, the impact of the slurry on the adjusting member can be reduced, and the wear and electrochemical corrosion of the adjusting member can be reduced.

[0008] In a possible embodiment, the adjusting member includes: an adjusting portion and a flow blocking portion, the adjusting portion is connected to the flow blocking portion, the adjusting portion is used to drive the flow blocking portion to move up and down in the through hole, one end of the flow blocking portion away from the adjusting portion is used to extend into the slurry channel, and the width of the flow blocking portion along the extension direction of the discharge port is between 10mm and 15mm.

[0009] In the embodiment of the present application, the width of the flow blocking portion along the extension direction of the discharge port is set to be between 10mm-15mm. By reducing the width of the flow blocking portion along the extension direction of the discharge port, the control accuracy of the unit adjustment member of the extrusion coating head can be improved. When the width of the flow blocking portion along the extension direction of the discharge port is set to be between 10mm-15mm, the slurry change caused by the abnormal control adjustment member of the slurry channel thickness at the sudden change position is reduced, and the change of the adjustment member on both sides of the sudden change position is gradually reduced or does not need to be adjusted directly. The effectiveness of the coating quality can be quickly controlled within the set upper and lower limit values, and the control accuracy and control speed are greatly improved.

[0010] In a possible embodiment, among the blocking parts of the plurality of the adjusting members, the transverse cross-sections of all the blocking parts except for the first and last blocking parts are parallelograms, and the blocking parts are arranged inclined to the extension direction of the discharge port on both sides along the extension direction of the discharge port.

[0011] The slurry will flow through the gap between the two flow-blocking parts. If the gap is perpendicular to the extension direction of the discharge port, the slurry will directly impact the battery pole piece. In the embodiment of the present application, the gap is set to be inclined to the extension direction of the discharge port. On the one hand, it can slow down the flow rate of the slurry, and on the other hand, it can avoid the slurry flowing through the gap from directly impacting the battery pole piece, which can further reduce the risk of bulging during coating and ensure the uniformity of the slurry during pole piece coating.

[0012] In a possible implementation, an end surface of the blocking portion away from the adjusting portion has a strip-shaped protrusion, the strip-shaped protrusion extends along the extension direction of the discharge port, and a plurality of the strip-shaped protrusions of the blocking portion are connected end to end.

[0013] After the adjusting part is adjusted in the height direction, the steps and gaps formed between the two flow-blocking parts will cause the slurry to form a fixed differential flow rate and shape, causing the slurry to gather at the discontinuous part of the slurry channel, and tiny protrusions will be generated at fixed positions on the width. After thousands of layers of winding, bulging problems will occur. After drying, the dry slurry is pulled by the local bulging force and has the risk of cracking, affecting the coating quality. In the embodiment of the present application, a strip protrusion is set at the bottom of the flow-blocking part to reduce the vortex line intensity generated by the steps and gaps in the width direction during the coating process, thereby reducing the local fluid induced velocity. Under the overall slurry pressure, the slurry thickness is adjusted before a stable differential flow rate and bulge difference state are formed, thereby improving the bulging problem of the pole piece.

[0014] In a possible embodiment, the extrusion coating head also includes: a flow control member, the flow control member is covered on the first slurry cavity, a plurality of through holes are opened on the flow control member, and the plurality of through holes are arranged at intervals along the length direction of the flow control member, and the slurry in the first slurry cavity flows into the slurry channel through the through holes.

[0015] The flow control member can slow down the flow rate of the slurry and improve the stability of the coating thickness. The through hole on the flow control member can make the slurry in the first slurry cavity evenly spread over the entire discharge port, which is beneficial to improve the uniformity of the slurry during coating.

[0016] In a possible implementation, the extrusion coating head further includes: a sealing member, wherein the sealing member is sleeved on the adjusting member, and the sealing member, the adjusting member and the through hole are all interference fit.

[0017] In this way, the seal can prevent the slurry from flowing out of the extrusion coating head from the through hole, thereby avoiding slurry leakage.

[0018] In a possible implementation manner, a clamping groove is provided on the adjusting member, and the sealing member is disposed in the clamping groove.

[0019] In this way, when the adjusting member moves up and down in the through hole, the sealing member can be prevented from falling off.

[0020] In a possible implementation, the adjustment assembly further includes: a bracket, the bracket is arranged on the upper surface of the second extrusion module, the bracket is used to fix the adjustment member, the bracket has a vertically arranged screw, and the screw is connected to the top of the adjustment member.

[0021] The adjusting member can be moved up and down in the through hole by rotating the screw, and the adjusting member can be moved up and down without rotating.

[0022] In a possible implementation manner, the linear flow blocking portion formed by the flow blocking portions of the plurality of adjusting members has arc-shaped ends at its front and rear ends.

[0023] In the entire regulating assembly, the two ends of the flow-blocking part are arc-shaped, and the arc-shaped end faces can prevent the slurry from directly impacting the pole piece, which is beneficial to improving the stability of coating.

[0024] Another aspect of an embodiment of the present application provides a coating device, comprising the extrusion coating head and a slurry delivery system as described above. The slurry delivery system is connected to the extrusion coating head, and the slurry delivery system is used to provide slurry to the extrusion coating head.

[0025] The coating device provided by the embodiment of the present application, wherein the slurry flow rate can be adjusted by squeezing the adjustment member of the coating head, which is conducive to improving the uniformity of the slurry thickness in each area on the battery pole piece, and the adjustment accuracy is high, ensuring that the electrode assembly formed by the battery pole piece has good safety and chemical properties, and can also save slurry and reduce the manufacturing cost of the electrode assembly. The adjustment member can also reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid straight-through, and reduce the risk of bulging during coating. The second slurry chamber can also effectively reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid straight-through, and thus greatly reduce the risk of bulging during coating. In addition, the second slurry chamber is located between the first slurry chamber and the adjustment member, which can reduce the impact of the slurry on the adjustment member, and reduce the wear and electrochemical corrosion of the adjustment member, compared with the second slurry chamber being located directly below the adjustment member or the second slurry chamber being located between the adjustment member and the discharge port.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative labor.

[0028] Figure 1 A schematic diagram of the structure of an extrusion coating head provided in one embodiment of the present application;

[0029] Figure 2 A schematic diagram of the exploded structure of an extrusion coating head provided in one embodiment of the present application;

[0030] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the cutting line AA;

[0031] Figure 4 A schematic diagram of the structure of an adjusting member provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of an adjusting member provided in an embodiment of the present application;

[0033] Figure 6 This is a schematic diagram of the regulating member controlling the slurry flow rate in this application;

[0034] Figure 7 A schematic diagram of the structure of a part of the adjustment components provided in one embodiment of the present application;

[0035] Figure 8 for Figure 7 Enlarged schematic diagram of the structure of part D in the middle.

[0036] The reference numerals in the specific implementation manner are as follows:

[0037] 100-extrusion coating head;

[0038] 110-adjustment component;

[0039] 111-adjusting member;

[0040] 1111-Regulation Department;

[0041] 11111-card slot;

[0042] 1112- flow blocking part;

[0043] 11121- bar-shaped protrusion;

[0044] 112-Stand;

[0045] 120-first extrusion module;

[0046] 121-first slurry chamber;

[0047] 122- second slurry chamber;

[0048] 130- second extrusion module;

[0049] 131-through hole;

[0050] 140-slurry channel;

[0051] 150-discharging port;

[0052] 160-feeding port;

[0053] 170-Flow control parts;

[0054] 171-through hole;

[0055] 180-Seals. DETAILED DESCRIPTION

[0056] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0057] Lithium-ion batteries have been widely used in people's lives, from portable consumer electronic devices such as mobile phones, laptops, cameras, to new energy electric vehicles, aerospace and energy storage systems. Its high capacity, high voltage, no memory effect, environmental protection and pollution-free advantages have enabled it to make contributions in a wide range of spaces and fields.

[0058] The production of lithium-ion batteries requires the coating process of the battery pole piece, which is to evenly coat the slurry with good stability, viscosity and fluidity on the positive and negative electrode current collectors. Pole piece coating is of great significance to the battery capacity, consistency and safety of lithium-ion batteries. Therefore, it is particularly important to ensure that the slurry coating on the battery pole piece is even.

[0059] There are two common coating methods: transfer coating and extrusion coating. Transfer coating is a mature technology, but its structure is complex and the equipment debugging is cumbersome. Moreover, the slurry of transfer coating is in a naked state (that is, the slurry is exposed to the air), and the slurry performance is difficult to guarantee.

[0060] The extrusion coating technology is becoming more and more mature, with a simple structure, compact equipment and easy debugging. In addition, the slurry in the coating head is in a closed state and isolated from the outside world, which can ensure the excellent performance of the slurry. Moreover, the coating accuracy of extrusion coating is higher than that of traditional transfer coating. Therefore, the use of extrusion coating to coat lithium-ion battery pole pieces has become a development trend.

[0061] In the related art, the extrusion coating head includes: a first extrusion module and a second extrusion module arranged in sequence from bottom to top in the height direction, a slurry channel is formed between the first extrusion module and the second extrusion module, and the slurry outlet of the slurry channel is used to coat the surface of the battery pole piece. A slurry cavity is provided on the first extrusion module, and the slurry cavity is connected to the slurry channel. The flow area of ​​the slurry channel is adjusted by adjusting the distance between the first extrusion module and the second extrusion module, thereby adjusting the slurry flow rate to ensure the requirements of different slurry thicknesses during coating.

[0062] However, the above-mentioned extrusion coating head has a high flow rate of the slurry in the slurry channel, which easily causes the problem of bulging during coating. In addition, the discharge port of the extrusion coating head has a certain width, and the slurry may have different thicknesses in the width direction of the slurry channel. The above-mentioned extrusion coating head has low adjustment accuracy and cannot ensure the uniformity of the coating slurry.

[0063] In view of this, in order to solve the above problems, the embodiment of the present application provides an extrusion coating head and a coating device, wherein the extrusion coating head includes: an adjustment component and a first extrusion module and a second extrusion module arranged opposite to each other from bottom to top, by opening a first slurry chamber and a second slurry chamber arranged along the extension direction of the discharge port on one side of the first extrusion module facing the second extrusion module, the second slurry chamber is located between the first slurry chamber and the adjustment component, the second slurry chamber can effectively reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, reduce the direct impact of the slurry on the pole piece, and thus greatly reduce the risk of bulging during coating. In addition, a plurality of adjustment members are arranged along the extension direction of the discharge port, the adjustment members can slide in the through holes on the second extrusion module, one end of the adjustment member extends into the slurry channel, and the problem of different thicknesses of the slurry in the width direction of the slurry channel (which can be understood as the extension direction of the discharge port) can be solved by the adjustment member, the adjustment accuracy is high, and it is conducive to ensuring the uniformity of the coating slurry.

[0064] The extrusion coating head and coating device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] Figure 1 This is a schematic diagram of the structure of an extrusion coating head 100 provided in an embodiment of the present application, refer to Figure 1 As shown, the extrusion coating head 100 provided in the embodiment of the present application includes: an adjustment component 110 , a first extrusion module 120 and a second extrusion module 130 .

[0066] Specifically, Figure 2 This is a schematic diagram of the exploded structure of an extrusion coating head 100 provided in one embodiment of the present application. Figure 3 for Figure 1 Schematic diagram of the cross-section structure along the cutting line AA, reference Figure 2 and Figure 3 As shown, in the extrusion coating head 100 provided in the embodiment of the present application, the first extrusion module 120 and the second extrusion module 130 are arranged opposite to each other from bottom to top and arranged side by side along the direction Z. Here, the relative arrangement means that the first extrusion module 120 and the second extrusion module 130 are arranged corresponding to each other, and it can be but is not limited to that the orthographic projections of the first extrusion module 120 and the second extrusion module 130 in the direction Z completely overlap. The direction Z refers to the direction in which the first extrusion module 120 and the second extrusion module 130 are arranged side by side in sequence.

[0067] There is a gap between the first extrusion module 120 and the second extrusion module 130 to form a slurry channel 140, and the opening of the slurry channel 140 communicating with the outside is a discharge port 150. When the slurry channel 140 is used to coat the battery pole piece, the slurry can be constrained by the first extrusion module 120 and the second extrusion module 130 and squeezed out from the slurry channel 140, and coated on the corresponding surface of the battery pole piece through the discharge port 150. Exemplarily, the battery pole piece can be a sheet structure, and the sheet-shaped battery pole piece has two surfaces opposite to each other along its thickness direction, wherein the material of the battery pole piece can be a conductive material such as aluminum, copper, aluminum alloy or copper alloy.

[0068] The flow area of ​​the slurry channel 140 determines the flow rate of the slurry flowing out of the slurry channel 140. The flow area of ​​the slurry channel 140 refers to the cross-sectional area of ​​the slurry channel 140 that can pass the slurry. The flow direction of the slurry channel 140 refers to the direction in which the slurry in the slurry channel 140 flows.

[0069] Continue to refer Figure 2 and Figure 3 As shown, in the extrusion coating head 100 provided in the embodiment of the present application, the adjustment component 110 includes a plurality of adjustment members 111, and the plurality of adjustment members 111 are arranged along the extension direction of the discharge port 150. It should be noted that, since the first extrusion module 120 and the second extrusion module 130 have a certain length, the discharge port 150 formed is a linear discharge port 150 along the length direction of the first extrusion module 120 and the second extrusion module 130, and the extension direction of the discharge port 150 can be understood as the length direction of the first extrusion module 120 and the second extrusion module 130, that is, Figure 2 The X direction in .

[0070] The second extrusion module 130 is provided with a through hole 131 perpendicular to the slurry channel 140, and part of the adjusting member 111 is movably arranged up and down in the through hole 131, and one end of the adjusting member 111 is used to extend into the slurry channel 140. The adjusting member 111 is slidably arranged in the through hole 131, so that the adjusting member 111 can move up and down in the through hole 131, so that the length of the adjusting member 111 extending into the slurry channel 140 changes, thereby adjusting the flow area there.

[0071] By changing the flow area of ​​the area corresponding to the slurry channel 140 and the adjusting member 111, the slurry flow rate of the area corresponding to the slurry channel 140 and the adjusting member 111 can be adjusted, and then the slurry thickness coated on the corresponding position on the battery pole piece can be adjusted. Adjusting the slurry flow rate through the adjusting member 111 is conducive to improving the uniformity of the slurry thickness of each area on the battery pole piece, ensuring that the electrode assembly formed by the battery pole piece has good safety and chemical properties, and can also save slurry and reduce the manufacturing cost of the electrode assembly.

[0072] Of course, this application does not stop here, please continue to refer to Figure 3 Combined with Figure 2 As shown, in the extrusion coating head 100 provided in the embodiment of the present application, the first extrusion module 120 has a first slurry cavity 121 and a second slurry cavity 122 formed on one side facing the second extrusion module 130 along the extending direction of the discharge port 150. The first slurry cavity 121 and the second slurry cavity 122 are long strip grooves extending along the extending direction of the discharge port 150. It is easy to understand that the first slurry cavity 121 and the second slurry cavity 122 of the long strip grooves are conducive to the slurry uniformly entering the fine material channel, thereby facilitating the improvement of the uniformity of the slurry thickness in various areas on the battery electrode.

[0073] The first slurry chamber 121 is used to communicate with an external slurry delivery system, for example, Figure 1 As shown, in some embodiments of the present application, a feed port 160 may be opened on one side of the first extrusion module 120 , and the feed port 160 is connected to an external slurry system.

[0074] The first slurry chamber 121 and the second slurry chamber 122 are both connected to the slurry channel 140, and the second slurry chamber 122 is located between the first slurry chamber 121 and the adjusting member 111. Figure 3 As shown, when the extrusion coating head 100 applies slurry to the battery electrode sheet on one side of the discharge port 150, the external slurry conveying system conveys the slurry to the first slurry chamber 121, and the slurry overflows from the first slurry chamber 121, passes through the slurry channel 140, the second slurry chamber 122, and the slurry channel 140 in sequence, and then is discharged from the discharge port 150. During this period, the slurry overflows from the second slurry chamber 122 and is adjusted by the adjustment member 111.

[0075] It is understandable that when the slurry flows through the second slurry chamber 122, the second slurry chamber 122 can effectively reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid direct impact, and thus greatly reduce the risk of bulging during coating. In addition, the second slurry chamber 122 is located between the first slurry chamber 121 and the adjusting member 111. Compared with the second slurry chamber 122 being located directly below the adjusting member 111 or the second slurry chamber 122 being located between the adjusting member 111 and the discharge port 150, the impact of the slurry on the adjusting member 111 can be reduced, and the wear and electrochemical corrosion of the adjusting member 111 can be reduced.

[0076] In summary, the extrusion coating head 100 provided in the embodiment of the present application can adjust the slurry flow rate through the adjusting member 111, which is conducive to improving the uniformity of the slurry thickness in each area on the battery pole piece, and the adjustment accuracy is high, ensuring that the electrode assembly formed by the battery pole piece has good safety and chemical properties, and can also save slurry and reduce the manufacturing cost of the electrode assembly. The adjusting member 111 can also reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid direct impact, and reduce the risk of bulging during coating. The second slurry chamber 122 can also effectively reduce the flow rate of the slurry, reduce the straight-through distance of the fluid, avoid direct impact, and thus greatly reduce the risk of bulging during coating. In addition, the second slurry chamber 122 is located between the first slurry chamber 121 and the adjusting member 111. Compared with the second slurry chamber 122 being located directly below the adjusting member 111 or the second slurry chamber 122 being located between the adjusting member 111 and the discharge port 150, the impact of the slurry on the adjusting member 111 can be reduced, and the wear and electrochemical corrosion of the adjusting member 111 can be reduced.

[0077] Figure 4 This is a schematic diagram of the structure of the adjustment member 111 provided in one embodiment of the present application. Figure 5 This is a schematic diagram of the structure of the adjustment member 111 provided in an embodiment of the present application, refer to Figure 4 and Figure 5 As shown, in some embodiments of the present application, the adjusting member 111 includes: an adjusting portion 1111 and a flow blocking portion 1112 .

[0078] Specifically, the regulating portion 1111 is connected to the flow blocking portion 1112, and the regulating portion 1111 is used to drive the flow blocking portion 1112 to move up and down in the through hole 131. The end of the flow blocking portion 1112 away from the regulating portion 1111 is used to extend into the slurry channel 140, wherein the width of the flow blocking portion 1112 along the extending direction of the discharge port 150 (see Figure 6 The width (indicated by W) is between 10mm and 15mm.

[0079] Figure 6 This is a schematic diagram of the regulating member 111 controlling the slurry flow rate in this application, refer to Figure 6As shown, the first extrusion module 120 and the second extrusion module 130 may have abnormal thickness of the local slurry channel 140 due to wear, electrochemical corrosion, slurry cavity pressure or mechanical structure material stress deformation, which may cause abnormal slurry flow area, for example Figure 6 At this time, the adjusting member 111 needs to be adjusted, for example, the adjusting member 111 corresponding to the position B is pressed down to reduce the flow area at the position B, and the adjusting member 111 corresponding to the position C is lifted up to increase the flow area at the position C. When the adjusting member 111 moves, the slurry at the bottom will diffuse to both sides or flow to the middle from both sides, causing abnormal slurry on both sides. At this time, the adjusting members 111 at the first position on both sides need to be adjusted in time to reduce the rapid change of the slurry, and the adjusting members 111 at the second position on both sides make a decreasing position change in sequence, and the adjusting members 111 from the third position on both sides decrease step by step in sequence until the overall slurry flow control curve meets the set requirements.

[0080] The abnormal change of the thickness of the slurry channel 140 is local and small, and there is a probability that multiple points will occur simultaneously. In the related art, the size of the flow blocking portion 1112 of the adjusting member 111 is relatively large, and the change of the adjusting member 111 caused by a sudden change of the abnormal thickness exceeds the requirement of the overall size adjustment. In the embodiment of the present application, the width of the flow blocking portion 1112 along the extension direction of the discharge port 150 is set to be between 10mm-15mm. By reducing the width of the flow blocking portion 1112 along the extension direction of the discharge port 150, the control accuracy of the unit adjusting member 111 of the extrusion coating head 100 can be improved. When the width of the flow blocking portion 1112 along the extension direction of the discharge port 150 is set to be between 10mm-15mm, the change of the slurry caused by the abnormal thickness of the slurry channel 140 at the sudden change position is reduced, and the change of the adjusting member 111 on both sides of the sudden change position will also be reduced accordingly or directly do not need to be adjusted. The effectiveness of the coating quality can be quickly controlled within the set upper and lower limit values, and the control accuracy and control speed are greatly improved.

[0081] Continue to refer Figure 6 Combined with Figure 5 As shown, in some embodiments of the present application, in the linear blocking portion 1112 formed by the blocking portions 1112 of the multiple adjusting members 111, the transverse cross-sections of all the blocking portions 1112 except for one blocking portion 1112 at the head and the tail are parallelograms, and the blocking portions 1112 are arranged at an angle to the extension direction of the discharge port 150 on both sides along the extension direction of the discharge port 150. It can be understood that a side of the blocking portion 1112 facing the discharge port 150 is parallel to the extension direction of the discharge port 150, and a side surface thereof is arranged at an angle to the extension direction of the discharge port 150.

[0082] It can be understood that the slurry will flow through the gap between the two flow-blocking portions 1112. If the gap is perpendicular to the extension direction of the discharge port 150, the slurry will directly impact the battery pole piece. In the embodiment of the present application, the gap is set to be inclined to the extension direction of the discharge port 150. On the one hand, it can slow down the flow rate of the slurry, and on the other hand, it can prevent the slurry flowing through the gap from directly impacting the battery pole piece, which can further reduce the risk of bulging during coating and ensure the uniformity of the slurry during pole piece coating.

[0083] Figure 7 This is a schematic diagram of the structure of a partial adjustment component 110 provided in an embodiment of the present application. Figure 8 for Figure 7 The enlarged schematic diagram of the D part structure is shown in the figure below. Figure 7 and Figure 8 Combined with Figure 5 As shown, in some embodiments of the present application, the end surface of the blocking portion 1112 away from the adjusting portion 1111 has a strip protrusion 11121, the strip protrusion 11121 extends along the extension direction of the discharge port 150, and multiple strip protrusions 11121 of the blocking portions 1112 are connected end to end.

[0084] After the adjusting member 111 is adjusted in the height direction, the steps and gaps formed between the two flow blocking parts 1112 will cause the slurry to form a fixed differential flow rate and shape, causing the slurry to gather at the discontinuous part of the slurry channel 140, and a tiny protrusion will be generated at a fixed position on the width. After thousands of layers of winding, the problem of bulging will occur. After drying, the dry slurry is pulled by the local bulging force and has the risk of cracking, which affects the coating quality. In the embodiment of the present application, a strip protrusion 11121 is provided at the bottom of the flow blocking part 1112 to reduce the vortex line intensity generated by the steps and gaps in the width direction during the coating process, thereby reducing the local fluid induced velocity, and completing the adjustment of the slurry thickness before forming a stable differential flow rate and bulge difference state under the overall slurry pressure, thereby improving the problem of bulging of the pole piece.

[0085] Continue to refer Figure 2 and Figure 3 As shown, in some embodiments of the present application, the extrusion coating head 100 may further include a flow control member 170. The flow control member 170 covers the first slurry chamber 121, and a plurality of through holes 171 are provided on the flow control member 170. The plurality of through holes 171 may be evenly spaced along the length direction of the flow control member 170, or may be unevenly spaced according to specific working conditions. The slurry in the first slurry chamber 121 flows into the slurry channel 140 through the through holes 171.

[0086] It can be understood that the flow control member 170 can slow down the flow rate of the slurry and improve the stability of the coating thickness. The through hole 171 on the flow control member 170 can allow the slurry in the first slurry chamber 121 to be evenly distributed throughout the outlet 150, which is beneficial to improving the uniformity of the slurry during coating.

[0087] Continue to refer Figure 2 and Figure 3 As shown, in some embodiments of the present application, the extrusion coating head 100 may further include a sealing member 180, and the sealing member 180 is sleeved on the adjusting member 111. For example, Figure 3 As shown in , the seal 180 can be sleeved on the adjusting portion 1111 of the adjusting member 111, wherein the seal 180 is interference fit with the adjusting portion 1111 and the through hole 131. In this way, the seal 180 can prevent the slurry from flowing out of the extrusion coating head 100 from the through hole 131, thereby avoiding slurry leakage.

[0088] refer to Figure 4 As shown, in some embodiments of the present application, a clamping groove 11111 may be provided on the adjusting member 111, and the sealing member 180 is disposed in the clamping groove 11111. For example, an annular clamping groove 11111 may be provided on the adjusting portion 1111, and the sealing member 180 is sleeved in the annular clamping groove 11111. In this way, when the adjusting member 111 moves up and down in the through hole 131, the sealing member 180 can be prevented from falling off.

[0089] Continue to refer Figure 2 and Figure 3 As shown, in some embodiments of the present application, the adjustment component 110 may further include: a bracket 112. Specifically, as Figure 3 As shown in the figure, the bracket 112 is arranged on the upper surface of the second extrusion module 130, and the bracket 112 is used to fix the adjustment member 111. The bracket 112 has a vertically arranged screw (not shown in the figure), and the screw is connected to the top of the adjustment member 111. By rotating the screw, the adjustment member 111 can be moved up and down in the through hole 131, and the adjustment member 111 can be moved up and down without rotating.

[0090] Continue to refer Figure 7 As shown, in some embodiments of the present application, the linear flow blocking portion 1112 formed by the flow blocking portions 1112 of the plurality of adjusting members 111 is arc-shaped at both ends. It can be understood that in the entire adjusting assembly 110, the two ends of the flow blocking portion 1112 are arc-shaped, and the arc-shaped end surface can prevent the slurry from directly impacting the pole piece, which is conducive to improving the stability of coating.

[0091] The embodiment of the present application also provides a coating device, including the extrusion coating head 100 and a slurry delivery system as shown above, and the slurry delivery system is connected to the extrusion coating head 100. Exemplarily, the slurry delivery system can be connected to the first slurry chamber 121 in the extrusion coating head 100. The slurry delivery system is used to provide slurry to the extrusion coating head 100.

[0092] Among them, the technical features of the extrusion coating head 100, the technical effects that can be achieved by the technical features, and the technical problems that can be solved by the technical effects are the same as the extrusion coating head 100 shown above, and will not be described one by one here.

[0093] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0094] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0095] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0096] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0097] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0098] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0099] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An extrusion coating head, characterized in that: include: An adjusting component and a first extrusion module and a second extrusion module which are arranged opposite to each other from bottom to top; There is a gap between the first extrusion module and the second extrusion module to form a slurry channel, and the opening of the slurry channel communicating with the outside is a discharge port; The adjusting assembly includes a plurality of adjusting members, and the plurality of adjusting members are arranged along the extending direction of the discharge port. A through hole perpendicular to the slurry channel is provided on the second extrusion module, and a part of the adjusting member is movably arranged up and down in the through hole, and one end of the adjusting member is used to extend into the slurry channel; A first slurry chamber and a second slurry chamber are provided on one side of the first extrusion module facing the second extrusion module along the extension direction of the discharge port. The first slurry chamber is used to communicate with an external slurry conveying system. The first slurry chamber and the second slurry chamber are both connected to the slurry channel. The second slurry chamber is located between the first slurry chamber and the adjusting member.

2. The extrusion coating head according to claim 1, characterized in that: The regulating member comprises: a regulating portion and a flow blocking portion; The regulating part is connected to the flow blocking part, the regulating part is used to drive the flow blocking part to move up and down in the through hole, and one end of the flow blocking part away from the regulating part is used to extend into the slurry channel; The width of the flow blocking portion along the extending direction of the discharge port is between 10 mm and 15 mm.

3. The extrusion coating head according to claim 2, characterized in that: Among the blocking parts of the plurality of adjusting members, the transverse cross-sections of all the blocking parts except the first and last blocking parts are parallelograms, and the blocking parts are arranged obliquely to the extension direction of the discharge port on both sides along the extension direction of the discharge port.

4. The extrusion coating head according to claim 2, characterized in that: An end surface of the blocking portion away from the regulating portion has a strip-shaped protrusion, and the strip-shaped protrusion extends along the extension direction of the discharge port. The strip-shaped protrusions of the plurality of blocking portions are connected end to end.

5. The extrusion coating head according to any one of claims 1 to 4, characterized in that: Also includes: Flow control parts; The flow control member is covered on the first slurry cavity, and a plurality of through holes are opened on the flow control member. The plurality of through holes are arranged at intervals along the length direction of the flow control member, and the slurry in the first slurry cavity flows into the slurry channel through the through holes.

6. The extrusion coating head according to any one of claims 1 to 4, characterized in that: Also includes: Seals; The sealing member is sleeved on the adjusting member, and the sealing member, the adjusting member and the through hole are all interference fit.

7. The extrusion coating head according to claim 6, characterized in that: The adjusting member is provided with a clamping groove, and the sealing member is arranged in the clamping groove.

8. The extrusion coating head according to any one of claims 1 to 4, characterized in that: The adjustment assembly further includes: a bracket; The bracket is arranged on the upper surface of the second extrusion module, and the bracket is used to fix the adjustment member; The bracket has a vertically arranged screw, and the screw is connected to the top of the adjusting member.

9. The extrusion coating head according to any one of claims 2 to 4, characterized in that: The linear flow blocking portion formed by the flow blocking portions of the plurality of adjusting members has arc-shaped ends at the beginning and the end.

10. A coating device, characterized in that: An extrusion coating head and a slurry delivery system comprising any one of claims 1 to 9; The slurry delivery system is connected to the extrusion coating head, and the slurry delivery system is used to provide slurry to the extrusion coating head.

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