Coating die head and coating device

Abstract

The utility model discloses a coating die head and a coating device. The coating die head is used for coating a base material with slurry, the coating die head is provided with a material storage cavity, the material storage cavity is used for storing the slurry, the inner surface of the material storage cavity is provided with a heating structural body, the heating structural body is used for making contact with the slurry, and the heating structural body is connected with an external power source. According to the coating die head, the slurry can be directly heated through the heating structure body, the heating speed is high, the temperature gradient is small, and the constant temperature of the slurry can be maintained more easily and stably.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a coating die head and a coating device. Background Art

[0002] In current battery production, electrode slurry is mostly coated on copper foil or aluminum foil through a coating die. Generally speaking, the slurry needs to be heated in the coating die so that the slurry can maintain a constant temperature, thereby improving the consistency of coating.

[0003] However, most of the current processes use a method of setting a heating medium cavity on the outer wall of the die storage cavity, and heating the electrode slurry inside the die storage cavity by circulating the heating medium. In this process, on the one hand, the heating of the electrode slurry needs to be slowly transferred through the outer wall to reach the required temperature, and when the material flows at a high speed, the heat transfer of the outer wall cannot be quickly transferred to the electrode slurry, and the temperature gradient is significant, resulting in a low actual slurry temperature and thus unstable coating performance; on the other hand, this process method makes the die bulky and complex in structure, resulting in high production costs.

[0004] Therefore, a coating die and a coating device are needed to at least partially solve the above problems. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] In order to at least partially solve the above-mentioned problems, the first aspect of the utility model provides a coating die head for coating a slurry on a substrate, the coating die head having a storage cavity, the storage cavity being used to store the slurry, the inner surface of the storage cavity being provided with a heating structure, the heating structure being used to contact the slurry, and the heating structure being connected to an external power supply.

[0007] According to the coating die head of the present application, the slurry can be directly heated by the heating structure, with a fast heating speed and a small temperature gradient, making it easier and more stable to maintain a constant temperature of the slurry.

[0008] Optionally, the heating structure comprises:

[0009] A heating part, the heating part is arranged on the inner surface of the storage cavity;

[0010] An insulating layer is provided to cover the heating part.

[0011] Optionally, the heating portion is configured as a heating layer, and the heating layer covers the inner surface of the storage cavity.

[0012] Optionally, the heating portion is configured as a graphene heating layer.

[0013] Optionally, the heating portion is configured in a strip shape and is arranged in a serpentine shape.

[0014] Optionally, the heating part is configured as at least one of a heating wire, a heating tube and a heating belt.

[0015] Optionally, the heating structure further comprises an interface layer, the interface layer is attached to the inner surface of the material storage cavity, and the heating part is arranged on the interface layer.

[0016] Optionally, the heating structure further comprises:

[0017] a heat transfer layer, the heat transfer layer being disposed on a surface of the insulating layer; and

[0018] A protective layer is arranged on the surface of the heat transfer layer.

[0019] Optionally, the heat transfer layer comprises:

[0020] a first heat-conducting layer, wherein the first heat-conducting layer is disposed on the insulating layer;

[0021] a heat-spreading layer, the heat-spreading layer being disposed on the first heat-conducting layer; and

[0022] A second heat-conducting layer is disposed on the heat-dissipating layer, wherein the protective layer is disposed on the second heat-conducting layer.

[0023] Optionally, the heat-spreading layer is constructed as a flexible graphite paper layer; and / or

[0024] The first heat conducting layer and the second heat conducting layer are configured as silicone layers.

[0025] Optionally, the thickness of the heat-saturating layer is 0.03-1 mm; and / or

[0026] The thickness of the insulating layer is 0.05-1 mm; and / or

[0027] The thickness of the heating part is 0.01-2 mm.

[0028] Optionally, the coating die head comprises an upper die head and a lower die head, the upper die head is connected to the lower die head, the material storage cavity is formed between the upper die head and the lower die head, and one of the upper die head and the lower die head is provided with a wire channel, and the wire channel is connected to the material storage cavity;

[0029] An electrode member is further provided between the insulating layer and the heating portion, the electrode member is electrically connected to the heating portion, and the electrode member is connected to a wire, and the wire is connected to a power source via the wire channel.

[0030] Optionally, at least one of the upper die head and the lower die head is provided with a feed port, the feed port is communicated with the storage chamber, and the feed port is used for the slurry to flow into the storage chamber.

[0031] Optionally, the coating die head further comprises a lip, wherein the lip is communicated with the storage chamber, and the slurry flows out through the lip and is coated on the surface of the substrate.

[0032] The second aspect of the utility model provides a coating device, which includes a bracket. The coating device also includes the coating die head described in the first aspect, and the coating die head is installed on the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following drawings of the present invention are used as a part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principle of the present invention.

[0034] In the attached figure:

[0035] Figure 1 A perspective schematic diagram of a coating die according to one embodiment of the present application;

[0036] Figure 2 is a cross-sectional schematic diagram of a coating die according to one embodiment of the present application;

[0037] Figure 3 It is a schematic diagram of a lower die of a coating die according to one embodiment of the present application;

[0038] Figure 4 A schematic top view of a heating structure arrangement of a coating die head according to one embodiment of the present application; and

[0039] Figure 5 It is a schematic cross-sectional view of a heating structure of a coating die head according to one embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100: coating die head 101: storage chamber

[0042] 102: Wire channel 103: Upper die head

[0043] 104: Lower die head 110: Heating structure

[0044] 111: Interface layer 112: Heating part

[0045] 113: Insulation layer 114: Heat transfer layer

[0046] 115: first heat conducting layer 116: second heat conducting layer

[0047] 117: Heat absorbing layer 118: Protective layer

[0048] 119: Electrode 105: Lip DETAILED DESCRIPTION

[0049] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0051] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0052] Now, refer to Figures 1 to 5 Exemplary embodiments according to the present invention are described in more detail.

[0053] The present application provides a coating die 100 for coating a slurry on a substrate, or a coating die 100 for coating a battery slurry. The coating die 100 has a storage chamber 101, the storage chamber 101 is used to store the slurry, and a heating structure 110 is provided on the inner surface of the storage chamber 101. The heating structure 110 is used to contact with the slurry, preferably directly contact, and the heating structure 110 is connected to an external power source.

[0054] According to the coating die head 100 of the present application, the slurry can be directly heated by the heating structure 110 , with a fast heating speed and a small temperature gradient, making it easier and more stable to maintain a constant temperature of the slurry.

[0055] Specifically, refer to Figure 1 , Figure 2 and Figure 3 , the coating die 100 of the present application includes an upper die 103 and a lower die 104, and the upper die 103 is connected to the lower die 104. In other words, the upper die 103 and the lower die 104 are buckled. When the upper die 103 is buckled on the lower die 104, a storage cavity 101 is formed between the upper die 103 and the lower die 104. Among them, at least one of the bottom of the upper die 103 and the top of the lower die 104 is provided with a groove, and after the two are buckled, the groove forms the storage cavity 101. In an optional embodiment, the bottom of the upper die 103 is configured as a plane, and the top of the lower die 104 is provided with a groove. The heating structure 110 is preferably arranged on the surface of the groove of the lower die 104.

[0056] At least one of the upper die head 103 and the lower die head 104 is provided with a feed port, and the feed port is communicated with the storage chamber 101. The feed port is used for the slurry to flow into the storage chamber 101. It can also be understood that the feed port is located upstream of the storage chamber 101.

[0057] The coating die 100 is also provided with a lip 105, which is connected to the storage chamber 101, and the slurry flows out of the coating die 100 through the lip 105 and is coated on the surface of the substrate. As an optional embodiment, the lip 105 can be configured as a gap between the die 103 and the lower die 104.

[0058] The heating structure 110 includes a heating portion 112 and an insulating layer 113. The heating portion 112 is arranged on the inner surface of the storage chamber 101, and the insulating layer 113 is covered and arranged on the heating portion 112. An electrode member 119 is also arranged between the insulating layer 113 and the heating portion 112, and the electrode member 119 is electrically connected to the heating portion 112, and the electrode member 119 is connected to a wire to further connect an external power supply. Among them, one of the upper die head 103 and the lower die head 104 is provided with a wire channel 102, and the wire channel 102 is connected to the storage chamber 101, and the wire is connected to the power supply via the wire channel 102. Optionally, the electrode member 119 can be a copper foil.

[0059] For example, in Figure 1 In the illustrated embodiment, the upper die head 103 is provided with a wire channel 102. Optionally, the wire channel 102 can utilize holes existing in the upper die head 103 or the lower die head 104 itself, which is more cost-effective.

[0060] As an optional embodiment, the heating portion 112 is configured as a heating layer, and the thickness of the heating portion 112 or the heating layer is 0.01-2 mm. More specifically, the heating layer is configured as a coating that can generate heat when powered. The heating layer covers the inner surface of the storage chamber 101. Thus, it can be configured according to the shape of the storage chamber 101, can be directly applied to an existing die head without major modifications, and can effectively heat certain dead volumes or dead angles and dead zones.

[0061] Optionally, the heating portion 112 is configured as a strip and arranged in a serpentine manner. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in the figure, the heating portion 112 or the heating layer 112 can be coated in a serpentine manner. Alternatively, the heating portion 112 can also be completely coated on the interface layer 111.

[0062] Exemplarily, the heating layer 112 may be a graphene heating layer, which is formed by coating a graphene conductive slurry, wherein the components of the graphene conductive slurry include graphene powder, a surfactant, a dispersant, a heat-resistant resin, and an organic solvent.

[0063] The particle size of the graphene powder is less than 20 nm. Preferably, the particle size of the graphene powder is less than 10 nm.

[0064] The surfactant is one or a combination of sodium dodecylbenzene sulfonate, sodium lignin sulfonate, and hexadecyltrimethylammonium bromide. Preferably, the surfactant is a mixture of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and the mass ratio of the two is 3:1 to 5:1.

[0065] The dispersant is selected from one or a combination of PVP, KD1, and BYK-2150. Preferably, the mass ratio of the mixture of dispersant KD1 and BYK-2150 is 3:1 to 1:1.

[0066] The heat-resistant resin is any one or more combinations of alkyd resin, phenolic resin, urea-formaldehyde resin, epoxy resin, and amino resin. Preferably, the heat-resistant resin is any one or more combinations of phenolic resin, urea-formaldehyde resin, and epoxy resin. More preferably, the heat-resistant resin is a mixture of phenolic resin and epoxy resin, and the mass ratio of the two is 3:1 to 1:1.

[0067] The organic solvent is any one or more of acetone, N-methylpyrrolidone (NMP), ethanol and methanol. Preferably, the organic solvent is a mixture of NMP and ethanol, and the volume ratio of the two is 3:1 to 5:1.

[0068] The mass fraction of graphene powder is 0.1-5wt%, the mass fraction of surfactant is 5-20wt%, the mass fraction of dispersant is 0.5-5wt%, and the mass fraction of heat-resistant resin is 5-60wt%. Preferably, the mass fraction of graphene powder is 0.5-3wt%, the mass fraction of surfactant is 10-15wt%, the mass fraction of dispersant is 1-3wt%, and the mass fraction of heat-resistant resin is 15-40wt%. The rest is organic solvent.

[0069] The preparation method of graphene conductive slurry is as follows: heat-resistant resin powder, surfactant, and dispersant are ultrasonically dissolved in an organic solvent, then graphene powder is added to form a suspension, the suspension is ultrasonically treated to obtain a uniformly dispersed initial slurry, and then a uniformly dispersed and fully graphene conductive slurry is obtained by high-speed shear emulsification.

[0070] The coating shape of graphene conductive paste on the substrate is as follows Figure 4 As shown, the coating thickness is 0.01-2mm, and the width of each strip is 3-30mm. After coating, it is cured by infrared heating method, the curing temperature is 80-150°C, and the curing time is 10-120min. Preferably, the curing temperature is 100-120°C, and the curing time is 30-90min. After curing, the above-mentioned graphene heating layer is formed. In addition, the copper foil connected to the graphene heating layer has a width equal to that of the graphene heating layer, and a thickness of 0.01-2mm.

[0071] Alternatively, as another optional embodiment, the heating portion 112 may also be configured as at least one of a heating wire, a heating tube, and a heating belt.

[0072] The insulating layer 113 may be a polyimide insulating film, a polyethylene insulating film, a polypropylene insulating film or a polytetrafluoroethylene film, and its thickness is 0.05-1 mm. Preferably, the insulating layer 113 may be a polyimide insulating film or a polytetrafluoroethylene film, and its thickness is 0.1-0.5 mm.

[0073] Please refer to the following Figure 5 The heating structure 110 further includes an interface layer 111, a heat transfer layer 114 and a protective layer 118. The interface layer 111 is attached to the inner surface of the storage cavity 101, and the heating portion 112 is disposed on the interface layer 111. Exemplarily, the interface layer 111 may be an epoxy resin coating. The heat transfer layer 114 is disposed on the surface of the insulating layer 113, and the heat transfer layer 114 is used to evenly disperse the heat generated by the heating portion 112.

[0074] The protective layer 118 is disposed on the surface of the heat transfer layer 114. Optionally, the protective layer 118 may be one of a PET film, a PP film, a PVC film, a PI film, a PS film or a PE film. Preferably, the protective layer 118 may be a PET film or a PI film.

[0075] The heat transfer layer 114 includes a first heat conducting layer 115, a heat balancing layer 117, and a second heat conducting layer 116. The first heat conducting layer 115 is disposed on the insulating layer 113, and the heat balancing layer 117 is disposed on the first heat conducting layer 115. The second heat conducting layer 116 is disposed on the heat balancing layer 117. In other words, the heat balancing layer 117 is located between the first heat conducting layer 115 and the second heat conducting layer 116. For example, Figure 5 As shown in FIG. 1 , the heat-spreading layer 117 is located above the first heat-conducting layer 115 , and the second heat-conducting layer 116 is located above the heat-spreading layer 117 . In addition, the protective layer 118 is disposed on the second heat-conducting layer 116 , or in other words, the protective layer 118 is disposed above the second heat-conducting layer 116 .

[0076] As an optional embodiment, the heat-spreading layer 117 is constructed as a flexible graphite paper layer, and its thickness is 0.03-1 mm. Preferably, the thickness of the flexible graphite paper layer is 0.1-0.8 mm.

[0077] The first heat conducting layer 115 and the second heat conducting layer 116 are configured as silicone layers.

[0078] The present application also provides a coating device, which comprises a bracket and the coating die head of the first aspect, wherein the coating die head is installed on the bracket.

[0079] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0080] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and explanation, and the present invention is not limited to the above-mentioned embodiments. According to the teachings of the present invention, more variations and modifications can be made, and these variations and modifications all fall within the scope of protection required by the present invention.

Claims

1. A coating die head for coating a slurry on a substrate, characterized in that: The coating die head has a storage cavity, which is used to store the slurry. The inner surface of the storage cavity is provided with a heating structure, which is used to contact with the slurry and is connected to an external power source.

2. The coating die head according to claim 1, characterized in that: The heating structure comprises: A heating part, the heating part is arranged on the inner surface of the storage cavity; An insulating layer is provided to cover the heating part.

3. The coating die head according to claim 2, characterized in that: The heating portion is configured as a heating layer, and the heating layer covers the inner surface of the material storage cavity.

4. The coating die head according to claim 3, characterized in that: The heating portion is configured as a graphene heating layer.

5. The coating die head according to claim 2, characterized in that: The heating part is configured in a strip shape and is arranged in a serpentine rotation.

6. The coating die head according to claim 5, characterized in that: The heating part is configured as at least one of a heating wire, a heating tube and a heating belt.

7. The coating die head according to claim 2, characterized in that: The heating structure further comprises an interface layer, the interface layer is attached to the inner surface of the material storage cavity, and the heating part is arranged on the interface layer.

8. The coating die head according to claim 2, characterized in that: The heating structure also includes: a heat transfer layer, the heat transfer layer being disposed on a surface of the insulating layer; and A protective layer is arranged on the surface of the heat transfer layer.

9. The coating die head according to claim 8, characterized in that: The heat transfer layer comprises: a first heat-conducting layer, wherein the first heat-conducting layer is disposed on the insulating layer; a heat-spreading layer, the heat-spreading layer being disposed on the first heat-conducting layer; and A second heat-conducting layer is disposed on the heat-dissipating layer, wherein the protective layer is disposed on the second heat-conducting layer.

10. The coating die head according to claim 9, characterized in that: The heat-spreading layer is constructed as a flexible graphite paper layer; and / or The first heat conducting layer and the second heat conducting layer are configured as silicone layers.

11. The coating die head according to claim 9, characterized in that: The thickness of the heat-saturating layer is 0.03-1 mm; and / or, The thickness of the insulating layer is 0.05-1 mm; and / or, The thickness of the heating part is 0.01-2 mm.

12. The coating die according to any one of claims 2 to 11, characterized in that: The coating die head comprises an upper die head and a lower die head, the upper die head is connected to the lower die head, the material storage cavity is formed between the upper die head and the lower die head, and one of the upper die head and the lower die head is provided with a wire channel, and the wire channel is connected to the material storage cavity; An electrode member is further provided between the insulating layer and the heating portion, the electrode member is electrically connected to the heating portion, and the electrode member is connected to a wire, and the wire is connected to a power source via the wire channel.

13. The coating die head according to claim 12, characterized in that: At least one of the upper die head and the lower die head is provided with a feed port, the feed port is communicated with the storage cavity, and the feed port is used for the slurry to flow into the storage cavity.

14. The coating die head according to claim 1, characterized in that: The coating die head also includes a lip, which is communicated with the storage cavity. The slurry flows out through the lip and is coated on the surface of the substrate.

15. A coating device, comprising a bracket, characterized in that: The coating device further comprises a coating die according to any one of claims 1 to 14, wherein the coating die is mounted on the bracket.

Images