Coated gasket, coating apparatus, and battery production line

Abstract

The application relates to the technical field of battery production, and in particular to a coating gasket, a coating device and a battery production line. The coating gasket comprises at least two flow channels, the at least two flow channels comprising a first flow channel and a second flow channel, the first flow channel being used for coating one of the first slurry and the second slurry, and the second flow channel being used for coating the other one of the first slurry and the second slurry; the coating gasket comprises a first end face used for being arranged towards a current collector, the first flow channel is provided with a first slurry outlet at the first end face, the first slurry outlet comprises a first outlet and a second outlet which are in communication with each other, and a blocking piece is arranged in the first flow channel and corresponds to the second outlet, the blocking piece is configured to reduce the flow area of the second outlet, so that the coating thickness of the slurry flowing out of the second outlet on the current collector is less than the coating thickness of the slurry flowing out of the first outlet on the current collector. The application can reduce the probability of producing mixed virtual edges in the drying process of the first coating area and the second coating area.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a coating pad, coating equipment, and battery production line. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] With the increasing maturity of new energy technologies, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery device, and the safety and stability of the battery device directly determine the performance of the entire vehicle.

[0004] In the production process of battery devices, the current collector of the battery device needs to be coated with a first slurry and a second slurry to form a coated electrode. The first slurry forms a first coating area on the current collector, and the second slurry forms a second coating area on the current collector. One of the first coating area and the second coating area is an insulating layer, and the other is an active material layer. During the drying process, the first coating area and the second coating area are prone to the problem of mixed materials and loose edges. Utility Model Content

[0005] In view of the above problems, this application provides a coating pad, coating equipment and battery production line, which solves the problem that the first coating area and the second coating area of ​​the battery device are prone to mixed material and loose edges during the drying process in the prior art.

[0006] A first aspect of the embodiments of this application provides a coating pad for coating a first slurry and a second slurry onto a current collector, comprising:

[0007] At least two flow channels, including a first flow channel and a second flow channel, wherein the first flow channel is used to coat one of the first slurry and the second slurry, and the second flow channel is used to coat the other of the first slurry and the second slurry;

[0008] The coating pad includes a first end face for facing the current collector. A first flow channel is provided on the first end face with a first slurry outlet. The first slurry outlet includes a first outlet and a second outlet that are interconnected. A blocking member is provided in the first flow channel corresponding to the second outlet. The blocking member is configured to reduce the flow area of ​​the second outlet so that the coating thickness of the slurry flowing out of the second outlet on the current collector is less than the coating thickness of the slurry flowing out of the first outlet on the current collector.

[0009] Among them, the second outlet is located closer to the second flow channel than the first outlet.

[0010] The embodiments of this application provide at least two flow channels, including a first flow channel and a second flow channel. The first flow channel is used to coat one of the first slurry and the second slurry, and the second flow channel is used to coat the other of the first slurry and the second slurry. The first flow channel has a first slurry outlet on the first end face of the coating pad facing the coating body. The first slurry outlet includes a first outlet and a second outlet that are interconnected. A blocking member is provided in the first flow channel corresponding to the second outlet. The blocking member is configured to reduce the flow area of ​​the second outlet. Since the second outlet is located closer to the second flow channel than the first outlet, the flow rate of the second outlet is reduced compared to the flow rate of the second outlet without the blocking member. In the same amount of time, the thickness of the slurry at the contact position of the first coating area and the second coating area is reduced, thereby reducing the probability of mixed edges in the first coating area and the second coating area during the drying process.

[0011] In some embodiments of this application, a second channel is provided on one side of the first channel along the first direction, and the second channel has a second slurry outlet on the first end face of the coating pad, wherein the first direction is the length direction of the coating pad.

[0012] The embodiments of this application provide a second channel on one side of the first channel along the first direction, wherein the second channel has a second slurry outlet on the first end face of the coating pad facing the coating body. Thus, one of the first slurry and the second slurry can be coated through the first channel, and the other of the first slurry and the second slurry can be coated through the second channel, thereby improving the coating efficiency of the current collector.

[0013] In some embodiments of this application, there are two first channels, and the two first channels are symmetrically arranged on both sides of the second channel along the first direction. The first channels are used to coat the first slurry to form a first coating area with insulating properties on the current collector.

[0014] The embodiments of this application set the number of first channels to two, and the two first channels are symmetrically arranged on both sides of the second channel along the first direction, wherein the first direction is the length direction of the coating pad. Then, one of the first slurry and the second slurry can be coated through the first channels, so that one of the first slurry and the second slurry coated by the first channels is symmetrically coated on the surface of the current collector, and the coated electrode sheet can be prepared more quickly.

[0015] In some embodiments of this application, the coating pad further includes a spacer portion disposed between the first flow channel and the second flow channel, and used to separate the first flow channel and the second flow channel, wherein the second flow channel is used to coat the second slurry to form a second coating area on the current collector, the second coating area including an active material layer.

[0016] The embodiments of this application provide a spacer portion, wherein the spacer portion is disposed between the first flow channel and the second flow channel and is used to separate the first flow channel and the second flow channel, wherein the second flow channel is used to coat the second slurry to form a second coating area on the current collector, the second coating area including an active material layer, thereby enabling the first slurry and the second slurry to be separated, reducing the probability of the first slurry and the second slurry mixing, and enabling the formation of the first coating area and the second coating area on the current collector.

[0017] In some embodiments of this application, the size of the spacer along the first direction is in the range of 0.1 mm to 1 mm.

[0018] In the embodiments of this application, by making the size of the spacer portion in the first direction within the range of 0.1 mm to 1 mm, the spacer portion can function to isolate the first flow channel and the second flow channel, and can reduce the probability of an uncoated area appearing between the first coating area formed by the first slurry on the current collector and the second coating area formed by the second slurry on the current collector.

[0019] In some embodiments of this application, the size of the spacer along the first direction is in the range of 0.2 mm to 0.8 mm.

[0020] In the embodiments of this application, by making the size of the spacer portion in the first direction within the range of 0.2 mm to 0.8 mm, the spacer portion can function to isolate the first flow channel and the second flow channel, and can reduce the probability of an uncoated area appearing between the first coating area formed by the first slurry on the current collector and the second coating area formed by the second slurry on the current collector.

[0021] In some embodiments of this application, the first outlet has a rectangular groove structure, the blocking member has a trapezoidal or triangular cross-section in the first direction, and the upper surface of the blocking member in the second direction is inclined upward along the first direction away from the first outlet. The second direction intersects with the first direction and is the thickness direction of the coated pad.

[0022] In the embodiments of this application, by making the first outlet into a rectangular groove structure, the blocking member having a trapezoidal or triangular cross-section in the first direction, and the upper surface of the blocking member in the second direction inclined upward along the direction away from the first outlet, the flow area of ​​the second outlet gradually decreases along the direction away from the first outlet. This reduces the amount of slurry flowing out of the second outlet in the same amount of time, thereby reducing the amount of slurry flowing out of the second outlet onto the surface of the collector, and thus reducing the probability of mixing in the first coating area and the second coating area.

[0023] In some embodiments of this application, the first outlet has a rectangular groove structure, and the blocking member has a rectangular cross-section in the first direction.

[0024] The embodiments of this application, by setting the first outlet as a rectangular trough structure and the blocking member having a rectangular cross-section in the first direction, can make the second outlet and the first outlet form a stair-shaped structure, thereby reducing the amount of slurry flowing out from the second outlet in the same amount of time, and thus reducing the probability of mixing in the first coating area and the second coating area.

[0025] In some embodiments of this application, the dimension of the second outlet along the second direction is in the range of 0.1 mm to 0.3 mm.

[0026] By making the size of the second outlet in the second direction within the range of 0.1 mm to 0.3 mm in the embodiments of this application, the flow rate of the slurry flowing out of the second outlet can be controlled, so that the slurry flowing out of the second outlet is appropriately reduced, and the surface of the collector is not exposed due to excessive reduction of slurry.

[0027] In some embodiments of this application, the size of the second outlet along the first direction is in the range of 0.5 mm to 2 mm.

[0028] In embodiments of this application, by keeping the size of the second outlet in the first direction within the range of 0.5 mm to 2 mm, the flow rate of the slurry flowing out of the second outlet can be controlled by controlling the size of the second outlet in the first direction, thereby reducing the amount of slurry flowing out of the second outlet.

[0029] In some embodiments of this application, the dimension of the first outlet along the first direction is in the range of 0.4 mm to 0.6 mm.

[0030] By including the dimensions of the first outlet in the first direction within the range of 0.4 mm to 0.6 mm in the embodiments of this application, the dimensions of the slurry flowing out of the first outlet in the first direction can be controlled, thereby achieving control over the coating dimensions of the electrode sheet.

[0031] A second aspect of the embodiments of this application provides a coating apparatus, comprising:

[0032] upper mold;

[0033] Lower mold; and

[0034] As mentioned in the above embodiment, the coating pad is disposed between the upper mold and the lower mold.

[0035] A third aspect of the embodiments of this application provides a battery production line, which includes the coating equipment mentioned in the above embodiments.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of a current collector after coating in the prior art;

[0039] Figure 2 A schematic diagram of the structure of a current collector after coating is provided for some embodiments of this application;

[0040] Figure 3 A three-dimensional structural schematic diagram of the coated pad provided in some embodiments of this application;

[0041] Figure 4 for Figure 3 A magnified schematic diagram of the coated pad at point A shown in the figure;

[0042] Figure 5 for Figure 3 The diagram shows the structure of the coated pad from a second-view perspective;

[0043] Figure 6 for Figure 3 The diagram shown is a structural schematic of the coated pad from a third-person perspective.

[0044] Figure 7 for Figure 6 A magnified schematic diagram of the coated pad at point B shown in the figure;

[0045] Figure 8 This is an exploded view of the coating apparatus provided in some embodiments of this application;

[0046] Figure 9 This is a schematic diagram of the coating equipment in operation.

[0047] The attached figures are labeled as follows:

[0048] 100. Coating equipment;

[0049] 10. Coating gasket; 11. First flow channel; 111. Blocking element; 12. Second flow channel; 13. First slurry outlet; 131. First outlet; 132. Second outlet; 14. Second slurry outlet; 15. Spacer; 16. First end face;

[0050] 20. Upper mold; 21. First mounting hole;

[0051] 30. Lower mold; 31. Second mounting hole;

[0052] 40. Conveying channel;

[0053] 200. Current collector; 201. First coating area; 2011. Conventional area; 2012. Thinning area; 202. Second coating area; 203. Blank area;

[0054] 300, back roller;

[0055] XX, First Direction;

[0056] YY, second direction;

[0057] ZZ, third-party orientation;

[0058] L1, the dimension of the spacer along the first direction;

[0059] H1, the dimension of the second outlet along the second direction;

[0060] H2, the dimension of the first outlet along the second direction;

[0061] L2, the dimension of the second outlet along the first direction;

[0062] L3, the dimension of the first outlet along the first direction;

[0063] H, the dimension of the coated pad along the second direction. Detailed Implementation

[0064] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0067] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0069] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0070] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0072] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0073] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

[0074] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0076] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0077] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0078] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0079] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0080] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0081] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0082] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0083] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0084] 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.

[0085] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0086] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0087] In the production process of battery devices, the current collector of the battery device needs to be coated with a first slurry and a second slurry to form a coated electrode. The first slurry forms a first coating area on the current collector, and the second slurry forms a second coating area on the current collector. One of the first coating area and the second coating area is an insulating layer, and the other is an active material layer. During the drying process, the first coating area and the second coating area are prone to the problem of mixed materials and loose edges.

[0088] To address this problem, embodiments of this application propose a coating pad for coating a first slurry and a second slurry onto a current collector. The pad includes at least two channels, a first channel and a second channel. The first channel coats one of the first and second slurries, and the second channel coats the other. The coating pad includes a first end face facing the current collector. The first channel has a first slurry outlet on its first end face, including a first outlet and a second outlet that communicate with each other. The first channel also has a connection to the second outlet. A blocking element is provided corresponding to the outlet. The blocking element is configured to reduce the flow area of ​​the second outlet so that the coating thickness of the slurry flowing out of the second outlet on the collector is less than that of the slurry flowing out of the first outlet on the collector. The second outlet is located closer to the second flow channel than the first outlet, which reduces the flow rate of the second outlet compared to the second outlet without the blocking element. In the same amount of time, the thickness of the slurry at the contact point between the first coating area and the second coating area is reduced, thereby reducing the probability of mixed edges in the first coating area and the second coating area during the drying process.

[0089] The coating pads in the embodiments of this application can be used on coating equipment or on other equipment that requires coating.

[0090] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0091] Reference Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of a current collector 200 after coating in the prior art. Figure 2 This application provides a schematic diagram of the structure of a current collector 200 after coating, based on some embodiments. Figure 1In this device, the surface of the current collector 200 is provided with a first coating area 201, a second coating area 202, and a blank area 203. There are two first coating areas 201, symmetrically arranged on both sides of the second coating area 202 along its width. Two blank areas 203 are provided on the edge of the current collector 200 along its width, located away from the second coating area 202. During the drying process, the current collector 200 is prone to mixing of the slurry in the first coating area 201 and the slurry in the second coating area 202, resulting in a loose edge. Therefore, the first coating area 201 and the second coating area 202 are coated using a coating device 100.

[0092] To reduce the probability of material mixing and false edges occurring between the slurry in the first coating area 201 and the slurry in the second coating area 202, such as... Figure 2 As shown, the first coating area 201 and / or the second coating area 202 can be partitioned. For example, the first coating area 201 can be divided into a regular area 2011 and a thinning area 2012, where the thickness of the thinning area 2012 is smaller than that of the regular area 2011. The thinning area 2012 is adjacent to the second coating area 202, which can reduce the mixing and blurring of the slurry in the first coating area 201 and the slurry in the second coating area 202. The thickness of the regular area 2011 is essentially the same, referring to the area of ​​the first coating area 201 away from the second coating area 202. Similarly, the thickness of the thinning area 2012 is also essentially the same. Likewise, the second coating area 202 can also be partitioned, reducing the thickness of the slurry in the second coating area 202 near the first coating area 201, which can also reduce the mixing and blurring of the slurry in the first coating area 201 and the slurry in the second coating area 202.

[0093] In order to prepare Figure 2 The electrode shown here has an improved structure for the coated pad 10.

[0094] A first aspect of the embodiments of this application provides a coated pad 10, such as Figures 3 to 7As shown, the coating pad 10 is used to coat the first slurry and the second slurry onto the current collector 200. The coating pad 10 includes at least two channels, including a first channel 11 and a second channel 12. The first channel 11 is used to coat one of the first slurry and the second slurry, and the second channel 12 is used to coat the other of the first slurry and the second slurry. The coating pad 10 includes a first end face 16, which is disposed facing the current collector 200. The first channel 11 has a first slurry outlet on the first end face 16. 13. The first slurry outlet 13 includes a first outlet 131 and a second outlet 132 that are interconnected. The first flow channel 11 is provided with a blocking member 111 corresponding to the second outlet 132. The blocking member 111 is configured to reduce the flow area of ​​the second outlet 132 so that the coating thickness of the slurry flowing out of the second outlet 132 on the collector 200 is less than the coating thickness of the slurry flowing out of the first outlet 131 on the collector 200. The second outlet 132 is located closer to the second flow channel 12 than the first outlet 131.

[0095] It should be noted that the current collector 200 here can be a continuous foil material that can be transported on the back roller 300. After the slurry flows out from the first slurry outlet 13, it can be coated onto the current collector 200, forming a continuous coating layer on the current collector 200 to form an electrode. After coating is completed, the electrode can be die-cut according to the required size to obtain an electrode with a predetermined size.

[0096] The first flow channel 11 and the second flow channel 12 are used to coat different slurries, such as the first flow channel 11 being used to coat the first slurry and the second flow channel 12 being used to coat the second slurry, or the first flow channel 11 being used to coat the second slurry and the second flow channel 12 being used to coat the first slurry. The first slurry includes an active material and the second slurry includes an insulating material, or the first slurry includes an insulating material and the second slurry includes an active material, thereby obtaining a first coating area 201 and a second coating area 202 with different properties.

[0097] The blocking member 111 is configured to reduce the flow area of ​​the second outlet 132 so that the coating thickness of the slurry flowing out of the second outlet 132 on the current collector 200 is less than the coating thickness of the slurry flowing out of the first outlet 131 on the current collector 200. This can be achieved by various structures, such as reducing the flow area of ​​the second outlet 132 to be less than the flow area of ​​the first outlet 131, for example, by reducing the dimension of the second outlet 132 along the length direction or the thickness direction.

[0098] Normally, the first slurry outlet 13 is a rectangular outlet, and the depth dimensions of the first outlet 131 and the second outlet 132 are the same. The thickness of the first coating area 201 or the second coating area 202 formed is consistent. In this case, it is easy for the slurry in the first coating area 201 and the slurry in the second coating area 202 to mix. Therefore, in this application, the first slurry outlet 13 is divided into two parts: a first outlet 131 and a second outlet 132. The first flow channel 11 is provided with a blocking member 111 corresponding to the second outlet 132. The blocking member 111 is configured to reduce the flow area of ​​the second outlet 132, so that the flow rate of the slurry flowing out of the first outlet 131 remains unchanged, while the flow rate of the slurry flowing out of the second outlet 132 is reduced at the same time. This makes it possible for the amount of slurry flowing out of the second outlet 132 to be less than the amount of slurry flowing out of the first outlet 131 in the same amount of time. As a result, the slurry flowing out of the second outlet 132 forms a thinned region 2012 with a smaller thickness, while the slurry flowing out of the first outlet 131 forms a conventional region 2011 with a larger thickness. The thickness of the thinned region 2012 is less than the thickness of the conventional region 2011.

[0099] Embodiments of this application employ at least two flow channels, including a first flow channel 11 and a second flow channel 12. The first flow channel 11 is used to coat one of a first slurry and a second slurry, and the second flow channel 12 is used to coat the other of the first slurry and the second slurry. A first end face 16 has a first slurry outlet 13, which includes a first outlet 131 and a second outlet 132 that are interconnected. A blocking member 111 is provided within the first flow channel 11, corresponding to the second outlet 132. The blocking member 111 is configured to reduce the flow area of ​​the second outlet 132, thereby reducing the flow area of ​​the second outlet 132. The coating thickness of the slurry flowing out of outlet 132 on the current collector 200 is less than that of the slurry flowing out of the first outlet 131 on the current collector 200. In this case, the second outlet 132 is located closer to the second flow channel 12 than the first outlet 131, which reduces the flow rate of the second outlet 132 compared to the second outlet 132 without the obstruction member 111. In the same amount of time, the thickness of the slurry at the contact position of the first coating area 201 and the second coating area 202 is reduced, thereby reducing the probability of mixed material and false edges in the first coating area 201 and the second coating area 202 during the drying process.

[0100] In some embodiments of this application, such as Figure 3 As shown, the first flow channel 11 has a second flow channel 12 on one side along the first direction. The second flow channel 12 has a second slurry outlet 14 on the first end face 16 of the coating pad 10 facing the coating body. The first direction is the length direction of the coating pad 10.

[0101] The first flow channel 11 here can be used to coat the first slurry, and the second flow channel 12 is used to coat the second slurry. The second slurry is coated onto the surface of the current collector 200 from the second slurry outlet 14, so that the first slurry and the second slurry can be coated on the current collector 200 respectively. The first slurry and the second slurry have different uses. The first slurry may include an active material and the second slurry may include an insulating material, or the first slurry may include an insulating material and the second slurry may include an active material.

[0102] The embodiments of this application provide a second channel 12 on one side of the first channel 11 along the first direction, wherein the second channel 12 has a second slurry outlet 14 on the first end face 16 of the coating pad 10. Thus, one of the first slurry and the second slurry can be coated through the first channel 11, and the other of the first slurry and the second slurry can be coated through the second channel 12, thereby improving the coating efficiency of the current collector 200.

[0103] In some embodiments of this application, there are two first flow channels 11, and the two first flow channels 11 are symmetrically arranged on both sides of the second flow channel 12 along the first direction.

[0104] The first flow channel 11 here is used to coat the first slurry, which includes an insulating material. At this time, the second flow channel 12 is used to coat the second slurry. Two insulating material layers can be formed on the current collector 200 through the two first flow channels 11, wherein an active material layer is between the two insulating material layers.

[0105] In the embodiments of this application, by setting the number of first channels 11 to two, and symmetrically distributing the two first channels 11 on both sides of the second channel 12 along the first direction, wherein the first direction is the length direction of the coating pad 10, one of the first slurry and the second slurry can be coated through the first channels 11, so that one of the first slurry and the second slurry coated by the first channels 11 is symmetrically coated on the surface of the current collector 200, thereby preparing the coated electrode sheet more quickly.

[0106] In some embodiments of this application, such as Figure 3 As shown, the coating pad 10 also includes a spacer 15, which is disposed between the first flow channel 11 and the second flow channel 12 and is used to separate the first flow channel 11 and the second flow channel 12.

[0107] It should be noted that the spacer 15 is formed between the first flow channel 11 and the second flow channel 12, which can reduce the probability of mixing of the slurry in the first flow channel 11 and the slurry in the second flow channel 12.

[0108] The spacer 15 here can also be called a snake mouth, which is used to separate the first flow channel 11 and the second flow channel 12. The introduction of the spacer 15 can also make the slurry sprayed in a spray-like structure on both sides of the first direction when it is coated on the current collector 200 under the action of the screw pump. Therefore, the introduction of the spacer 15 here can also help reduce the probability of mixed material false edges between the first coating area 201 and the second coating area 202.

[0109] Considering that there are two first flow channels 11, and a spacer 15 is provided between each first flow channel 11 and the second flow channel 12, there are two spacers 15.

[0110] The embodiments of this application provide a spacer 15, which is disposed between the first flow channel 11 and the second flow channel 12 and is used to separate the first flow channel 11 and the second flow channel 12, thereby separating the first slurry and the second slurry and reducing the probability of mixing of the first slurry and the second slurry.

[0111] In some embodiments of this application, such as Figure 3 and Figure 7 As shown, the size of the spacer 15 along the first direction is in the range of 0.1 mm to 1 mm.

[0112] The first direction here is Figure 3 In the XX direction, the first direction is consistent with the length direction of the coating pad 10, and the dimension of the spacer 15 along the first direction is L1. Here, L1 is in the range of 0.1 mm to 1 mm, and can be 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm or 1 mm, etc.

[0113] In the embodiments of this application, by making the size of the spacer 15 in the first direction within the range of 0.1 mm to 1 mm, the spacer 15 can function to isolate the first flow channel 11 and the second flow channel 12, and can reduce the probability of an uncoated area appearing between the first coating area 201 formed by the first slurry on the current collector 200 and the second coating area 202 formed by the second slurry on the current collector 200.

[0114] In some embodiments of this application, such as Figure 7 As shown, the dimension L1 of the spacer portion 15 along the first direction is in the range of 0.2 mm to 0.8 mm.

[0115] Specifically, the dimension L1 of the spacer 15 along the first direction can be 0.35 mm, 0.45 mm, 0.55 mm, 0.65 mm, 0.75 mm, or 0.8 mm, etc.

[0116] In the embodiments of this application, by making the size of the spacer 15 in the first direction within the range of 0.2 mm to 0.8 mm, the spacer 15 can function to isolate the first flow channel 11 and the second flow channel 12, and can reduce the probability of an uncoated area appearing between the first coating area 201 formed by the first slurry on the current collector 200 and the second coating area 202 formed by the second slurry on the current collector 200.

[0117] In some embodiments of this application, the first outlet 131 has a rectangular groove structure, the blocking member 111 has a trapezoidal or triangular cross section in the first direction, and the upper surface of the blocking member 111 in the second direction is inclined upward along the first direction away from the first outlet 131, wherein the second direction intersects the first direction and the second direction is the thickness direction of the coating pad 10.

[0118] In this embodiment, the first outlet 131 has a rectangular groove structure, and the blocking member 111 has a trapezoidal or triangular cross-section in the first direction. In this case, the blocking member 111 can be a long, narrow trapezoidal block or a long, narrow triangular block, which can reduce the flow rate of the second outlet 132. It is understood that the blocking member 111 can also be an irregular block structure, which can similarly block part of the second outlet 132, thereby reducing the flow rate exiting the second outlet 132.

[0119] The second direction here is Figure 3 The YY direction, which is the thickness direction of the coating pad 10, is the third direction. Figure 3 The ZZ direction in the text refers to the width direction of the coating pad 10.

[0120] In the embodiments of this application, by making the first outlet 131 into a rectangular groove structure, the blocking member 111 having a trapezoidal or triangular cross-section in the first direction, and the upper surface of the blocking member 111 in the second direction being inclined upward along the direction away from the first outlet 131, the depth of the second outlet 132 gradually decreases along the first direction away from the first outlet 131. This reduces the amount of slurry flowing out of the second outlet 132 in the same time, thereby reducing the amount of slurry flowing out of the second outlet 132 onto the surface of the collector 200, forming a thinning zone, and thus reducing the probability of mixing in the first coating area 201 and the second coating area 202.

[0121] In some embodiments of this application, such as Figure 4 As shown, the first outlet 131 has a rectangular groove structure, and the blocking member 111 has a rectangular cross-section in the first direction.

[0122] In this example, the blocking element 111 can be a long rectangular block structure, and both the first outlet 131 and the second outlet 132 are rectangular groove structures with different depths. Figure 7 As shown, the groove depth of the first outlet 131 can be represented by H2, the groove depth of the second outlet 132 can be represented by H1, and the thickness of the coating pad 10 is represented by H.

[0123] The embodiments of this application, by setting the first outlet 131 as a rectangular trough structure and the blocking member 111 having a rectangular cross-section in the first direction, can make the second outlet 132 and the first outlet 131 form a stair-shaped structure, thereby reducing the amount of slurry flowing out from the second outlet 132 in the same amount of time, and thus reducing the probability of mixing in the first coating area 201 and the second coating area 202.

[0124] It is understandable that the second outlet 132 here can also be set as a stepped structure. That is to say, the first outlet 131 and the second outlet 132 are in the form of a three-step staircase, which can also reduce the flow of the second outlet 132.

[0125] In some embodiments of this application, the dimension H1 of the second outlet 132 along the second direction is in the range of 0.1 mm to 0.3 mm.

[0126] The dimension H1 of the second outlet 132 along the second direction is the groove depth of the second outlet 132. The groove depth H2 of the first outlet 131 can be set in a conventional way, such as H2 being about 0.5 mm. What needs to be changed is the groove depth of the second outlet 132, that is, the dimension H1 of the second outlet 132 along the second direction. Specifically, the dimension H1 of the second outlet 132 along the second direction should be less than H2. Specifically, the dimension H1 of the second outlet 132 along the second direction can be 0.1 mm, 0.2 mm, 0.25 mm, or 0.3 mm, etc.

[0127] By including the second outlet 132 in the second direction within a size range of 0.1 mm to 0.3 mm in the embodiments of this application, the flow rate of the slurry flowing out of the second outlet 132 can be controlled, thereby reducing the amount of slurry flowing out of the second outlet 132.

[0128] In some embodiments of this application, such as Figure 7 As shown, the second outlet 132 has a dimension of L2 along the first direction, and L2 is in the range of 0.5 mm to 2 mm.

[0129] L2 here can be 0.5 mm, 1 mm, 1.5 mm or 2 mm, which can appropriately reduce the flow rate of the slurry flowing out of the second outlet 132, so that the thickness of the thinning area 2012 on the surface of the current collector 200 corresponding to the second outlet 132 is slightly smaller, and there will be no exposed metal. During the drying process of the coated electrode, the probability of the slurry in the weak area and the slurry in the second coating area 202 mixing and forming a false edge is reduced.

[0130] In the embodiments of this application, by keeping the size of the second outlet 132 along the first direction within the range of 0.5 mm to 2 mm, the flow rate of the slurry flowing out of the second outlet 132 can be controlled by controlling the size of the second outlet 132 along the first direction, thereby reducing the amount of slurry flowing out of the second outlet 132.

[0131] In some embodiments of this application, such as Figure 7 As shown, the first outlet 131 has a dimension of L3 along the first direction, and L3 is in the range of 0.4 mm to 0.6 mm.

[0132] Specifically, L3 can be 0.4 mm, 0.5 mm, or 0.6 mm. The total dimension of the first outlet 131 along the first direction L3 and the second outlet 132 along the first direction L2 is consistent with the dimension of the conventional second outlet 132, which allows for control of the size of the coated slurry.

[0133] In this example, both the first outlet 131 and the second outlet 132 are used to coat the first slurry to form the first coating area 201, which is an insulating layer. The second slurry outlet 14 is used to coat the second slurry to form the second coating area 202, which is an active material layer.

[0134] By including the dimensions of the first outlet 131 in the first direction within the range of 0.4 mm to 0.6 mm in the embodiments of this application, the dimensions of the slurry flowing out of the first outlet 131 in the first direction can be controlled, thereby achieving control over the coating dimensions of the electrode sheet.

[0135] A second aspect of the embodiments of this application provides a coating apparatus 100, such as... Figure 8 and Figure 9 As shown, it includes an upper mold 20, a lower mold 30, and a coating pad 10 as mentioned in the above embodiment, with the coating pad 10 disposed between the upper mold 20 and the lower mold 30.

[0136] Optionally, the coating apparatus 100 further includes a conveying channel 40 for providing a first slurry or a second slurry to the lower mold 30 or the upper mold 20. The first slurry enters the lower mold 30 from the first channel 11 and is coated onto the collector 200 from the first slurry outlet 13. The second slurry enters the lower mold 30 from the second channel 12 and is coated onto the collector 200 from the second slurry outlet 14.

[0137] Optionally, the upper mold 20 is provided with a first mounting hole 21, and the lower mold 30 is provided with a second mounting hole 31. Correspondingly, the coating pad 10 is also provided with a through hole corresponding to the first mounting hole 21 and the second mounting hole 31, so that a detachable connection can be realized between the upper mold 20, the coating pad 10 and the lower mold 30.

[0138] It should be noted that the current collector 200 is rotatably disposed on the surface of the back roller 300, and the first slurry and the second slurry are coated simultaneously through the first slurry outlet 13 and the second slurry outlet 14 respectively. The first slurry includes an insulating material, and the second slurry includes an active material.

[0139] A third aspect of the embodiments of this application provides a battery production line, which includes the coating equipment 100 mentioned in the above embodiments.

[0140] The battery production line here also includes winding equipment, welding equipment and other equipment used in the battery production process, which will not be listed here.

[0141] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0142] A first aspect of the embodiments of this application provides a coating pad 10 for coating a first slurry and a second slurry onto a current collector 200. The coating pad 10 includes at least two flow channels, including a first flow channel 11 and a second flow channel 12. The first flow channel 11 is used to coat one of the first slurry and the second slurry, and the second flow channel 12 is used to coat the other of the first slurry and the second slurry. The coating pad 10 includes a first end face 16, which is disposed toward the current collector 200, and the first flow channel 11 is disposed toward the first end face. The first slurry outlet 13 is provided on the first flow channel 16. The first slurry outlet 13 includes a first outlet 131 and a second outlet 132 that are interconnected. A blocking member 111 corresponding to the second outlet 132 is provided in the first flow channel 11. The blocking member 111 is configured to reduce the flow area of ​​the second outlet 132, so that the coating thickness of the slurry flowing out of the second outlet 132 on the current collector 200 is less than the coating thickness of the slurry flowing out of the first outlet 131 on the current collector 200. The second outlet 132 is located closer to the second flow channel 12 than the first outlet 131. Further, the first flow channel 11 has a second flow channel 12 on one side along a first direction. The second flow channel 12 has a second slurry outlet 14 on the first end face 16 of the coating pad 10. The first direction is the length direction of the coating pad 10. Further, there are two first flow channels 11, and the two first flow channels 11 are symmetrically arranged on both sides of the second flow channel 12 along the first direction. The first flow channels 11 are used to coat the first slurry to form a first coating area 201 with insulating properties on the current collector 200. Further, the coating pad 10 also includes a spacer 15, which is disposed between the first flow channel 11 and the second flow channel 12 and serves to separate the first flow channel 11 and the second flow channel 12. The second flow channel 12 is used to coat the second slurry to form a second coating area 202 on the current collector 200, and the second coating area 202 includes an active material layer. Further, the dimension of the spacer 15 along the first direction is in the range of 0.1 mm to 1 mm. Further, the dimension of the spacer 15 along the first direction is in the range of 0.2 mm to 0.8 mm. Further, the first outlet 131 has a rectangular groove structure, the blocking member 111 has a trapezoidal or triangular cross-section in the first direction, and the upper surface of the blocking member 111 in the second direction is inclined upward along the first direction away from the first outlet 131, wherein the second direction intersects the first direction and is the thickness direction of the coating pad 10. Further, the first outlet 131 has a rectangular groove structure, and the blocking member 111 has a rectangular cross-section in the first direction. Further, the dimension of the second outlet 132 along the second direction is in the range of 0.1 mm to 0.3 mm, wherein the second direction intersects the first direction and is the thickness direction of the coating pad 10. Further, the dimension of the second outlet 132 along the first direction is in the range of 0.5 mm to 2 mm.Furthermore, the dimension of the first outlet 131 along the first direction is in the range of 0.4 mm to 0.6 mm.

[0143] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A coating pad for coating a first slurry and a second slurry onto a current collector, characterized in that, include: At least two flow channels, the at least two flow channels including a first flow channel and a second flow channel, the first flow channel being used to coat one of the first slurry and the second slurry, and the second flow channel being used to coat the other of the first slurry and the second slurry; The coating pad includes a first end face, which is disposed facing the current collector. The first flow channel has a first slurry outlet on the first end face. The first slurry outlet includes a first outlet and a second outlet that are interconnected. The first flow channel has a blocking member disposed corresponding to the second outlet. The blocking member is configured to reduce the flow area of ​​the second outlet so that the coating thickness of the slurry flowing out of the second outlet on the current collector is less than the coating thickness of the slurry flowing out of the first outlet on the current collector. The second outlet is located closer to the second flow channel than the first outlet.

2. The coated gasket as described in claim 1, characterized in that, The first flow channel has a second flow channel on one side along the first direction, and the second flow channel has a second slurry outlet on the first end face of the coating pad, wherein the first direction is the length direction of the coating pad.

3. The coated gasket as described in claim 2, characterized in that, The number of the first flow channels is two, and the two first flow channels are symmetrically arranged on both sides of the second flow channel along the first direction, wherein the first flow channels are used to coat the first slurry to form a first coating area with insulating properties on the current collector.

4. The coated gasket as described in claim 3, characterized in that, The coating pad further includes a spacer portion disposed between the first flow channel and the second flow channel, and used to separate the first flow channel and the second flow channel, wherein the second flow channel is used to coat the second slurry to form a second coating area on the current collector, the second coating area including an active material layer.

5. The coated gasket as described in claim 4, characterized in that, The size of the spacer along the first direction is in the range of 0.1 mm to 1 mm.

6. The coated gasket as described in claim 5, characterized in that, The size of the spacer along the first direction is in the range of 0.2 mm to 0.8 mm.

7. The coated gasket as described in claim 3, characterized in that, The first outlet has a rectangular groove structure, the blocking member has a trapezoidal or triangular cross-section in the first direction, and the upper surface of the blocking member in the second direction is inclined upward along the first direction away from the first outlet. The second direction intersects the first direction and is the thickness direction of the coating pad.

8. The coated gasket as described in claim 3, characterized in that, The first outlet has a rectangular groove structure, and the blocking member has a rectangular cross-section in the first direction.

9. The coated gasket as described in claim 8, characterized in that, The dimension of the second outlet along the second direction is in the range of 0.1 mm to 0.3 mm, wherein the second direction intersects the first direction and the second direction is the thickness direction of the coated pad.

10. The coated gasket as described in claim 8 or 9, characterized in that, The dimensions of the second outlet along the first direction are in the range of 0.5 mm to 2 mm.

11. The coated gasket as described in claim 8 or 9, characterized in that, The dimension of the first outlet along the first direction is in the range of 0.4 mm to 0.6 mm.

12. A coating apparatus, characterized in that, include: upper mold; Lower mold; as well as The coating pad as described in any one of claims 1 to 11, wherein the coating pad is disposed between the upper mold and the lower mold.

13. A battery production line, characterized in that, The battery production line includes the coating equipment as described in claim 12.

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