Processing device for battery electrode sheet

Abstract

Disclosed is a processing device for a battery electrode sheet, comprising a coating apparatus and a driving apparatus. The driving apparatus is used for driving an electrode sheet base body to move in the length direction of the electrode sheet base body; and the coating apparatus is used for coating the surface of the moving electrode sheet base body with a metal slurry. The coating apparatus is provided to coat the surface of the electrode sheet base body with the metal slurry, and because the electrode sheet base body has good ductility compared with metal in the metal slurry, the thickness of the battery electrode sheet can be reduced; in addition, by providing at least two flattening assemblies in the coating apparatus, the thickness of the metal slurry on the electrode sheet base body can be adjusted multiple times, thereby achieving the technical effect of improving the thickness size accuracy of the battery electrode sheet.

Description

A battery electrode processing equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on September 1, 2023, with application number 202322374125.8 and invention name “A processing device for battery pole pieces”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention belongs to the technical field of battery processing, and in particular relates to a processing device for battery pole pieces.

[0004] Background of the Invention

[0005] The production of lithium battery anodes usually involves extruding or molding lithium metal blocks or ingots into lithium metal strips of a certain thickness.

[0006] However, this production method has two drawbacks: First, the thickness of the extruded (molded) sheet is uneven, making it difficult to ensure the consistency of the lithium sheet. Second, the ductility of the metallic lithium block is limited, which cannot meet the requirements of ultra-thin lithium battery anodes.

[0007] Utility Model Content

[0008] In view of the above problems, the present invention discloses a battery pole piece processing device to overcome the above problems or at least partially solve the above problems.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] The utility model provides a battery pole piece processing device, comprising a coating device and a driving device; the driving device is used to drive the pole piece substrate to move along its length direction, and the coating device is used to coat metal slurry on the surface of the pole piece substrate;

[0011] The coating device includes a coating component and a leveling component. The coating component is capable of spraying the metal slurry onto the pole piece substrate. The leveling component is located in front of the coating component along the moving direction of the pole piece substrate and is used to adjust the thickness of the metal slurry on the pole piece substrate.

[0012] There are at least two groups of the coating components, and each group of the coating components includes two coating rollers. The two coating rollers are respectively located on both sides of the pole piece substrate along its own thickness direction and are spaced apart from the pole piece substrate.

[0013] Furthermore, a preset distance is set between the two coating rollers in each group of the coating components, and the preset distance between the two coating rollers in each group of the coating components decreases successively along the moving direction of the electrode substrate.

[0014] Furthermore, the coating assembly includes a hot melt kettle and an injection nozzle;

[0015] The injection nozzle can spray the metal slurry onto the pole piece substrate; the hot melt kettle is connected to the injection nozzle and is used to provide the metal slurry to the injection nozzle.

[0016] Furthermore, the injection nozzle moves back and forth along a width direction parallel to the pole piece substrate.

[0017] Furthermore, the plane where the pole piece substrate is located is parallel to the horizontal plane, and there are at least two groups of coating components, which are respectively located above and below the pole piece substrate.

[0018] Furthermore, the coating roller includes a roller body, a first outer wheel and a second outer wheel;

[0019] The width of the roller body is the same as the width of the pole piece substrate, and the diameter of the first outer wheel and the diameter of the second outer wheel are both larger than the diameter of the roller body; the first outer wheel is connected to the first end face of the roller body, and the second outer wheel is connected to the second end face of the roller body.

[0020] Furthermore, a slurry containing groove is provided on the connection surface between the first outer wheel and the roller body and on the connection surface between the second outer wheel and the roller body.

[0021] Furthermore, a cooling device is included;

[0022] Along the moving direction of the pole piece substrate, the cooling device is located in front of the coating device and is used to cool the metal slurry on the pole piece substrate.

[0023] Furthermore, it also includes a central control device, a first temperature measuring device and a second temperature measuring device;

[0024] Along the moving direction of the electrode substrate, the first temperature measuring device is located behind the coating assembly, and is used to detect the temperature of the electrode substrate before coating; the second temperature measuring device is located inside the coating assembly, and is used to detect the temperature inside the coating assembly; the first temperature measuring device and the second temperature measuring device are both electrically connected to the central control device.

[0025] Furthermore, it also includes a third temperature measuring device and a fourth temperature measuring device; the third temperature measuring device is located in the cooling device and is used to detect the temperature in the cooling device; along the moving direction of the electrode substrate, the fourth temperature measuring device is located in front of the cooling device and is used to detect the temperature of the electrode substrate after cooling. The third temperature measuring device and the fourth temperature measuring device are both electrically connected to the central control device.

[0026] The advantages and beneficial effects of the present invention are:

[0027] In the battery pole piece processing equipment of the present invention, a coating device is provided and metal slurry is coated on the surface of the pole piece substrate. The pole piece substrate has good ductility compared to the metal in the metal slurry, so the thickness of the battery pole piece can be reduced. At the same time, at least two sets of flattening components are provided in the coating device to adjust the thickness of the metal slurry on the pole piece substrate multiple times, thereby achieving the technical effect of improving the thickness dimensional accuracy of the battery pole piece.

[0028] BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0030] FIG1 is a schematic structural diagram of the connection between a driving device and a pole piece substrate in a battery pole piece processing device according to this embodiment;

[0031] FIG2 is a schematic structural diagram of a coating device in a battery electrode processing device according to this embodiment;

[0032] FIG3 is a schematic structural diagram of a coating device and a cooling device in a battery electrode processing device according to this embodiment;

[0033] FIG4 is a schematic structural diagram of a coating roller in the battery electrode processing equipment of this embodiment.

[0034] In the figure: 1. coating device; 2. electrode substrate; 3. driving device; 4. cooling device; 5. central control device; 6. first temperature measuring device; 7. second temperature measuring device; 8. third temperature measuring device; 9. fourth temperature measuring device; 11. coating assembly; 12. leveling assembly; 12a. first leveling assembly; 12b. second leveling assembly; 12c. third leveling assembly; 31. first transmission roller; 32. second transmission roller; 111. hot melt kettle; 112. lithium melting kettle; 113. injection nozzle; 121. coating roller; 122. roller body; 123. first outer wheel; 124. second outer wheel; 125. slurry tank.

[0035] Methods of implementing this application

[0036] To make the objectives, technical solutions, and advantages of the present invention more clear, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be understood that the terms "comprises / comprising," "consisting of," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product, apparatus, process, or method that includes a list of elements includes not only those elements but also, if necessary, other elements not explicitly listed, or elements inherent to such product, apparatus, process, or method. In the absence of further limitations, elements defined by the phrases "comprises / comprising," "consisting of," do not preclude the presence of additional identical elements in the product, apparatus, process, or method that includes the elements.

[0038] It should also be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific direction, be constructed or operate in a specific direction, and should not be understood as limiting the present invention.

[0039] In this embodiment, the right is considered as the front and the left is considered as the back.

[0040] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] As shown in Figures 1 to 4 , the battery electrode processing equipment of this embodiment can be used for processing lithium battery anodes. In the following description, the electrode substrate 2 is copper foil, and the metal slurry is lithium alloy slurry. Based on this, by coating the lithium alloy slurry on the copper foil to form the lithium battery anode, the good ductility of copper metal can be utilized to reduce the thickness of the lithium battery anode, which can adapt to lithium battery anode materials of various thicknesses.

[0043] Of course, in other embodiments, the material of the pole piece substrate and the type of metal slurry may need to be adjusted accordingly.

[0044] The battery electrode processing equipment includes a coating device 1 and a driving device 3. The driving device 3 is used to drive the copper foil to move along the length direction of the copper foil, and the coating device is used to coat the surface of the copper foil with lithium alloy slurry to form a lithium battery anode.

[0045] The drive device 3 includes a first transmission roller 31 and a second transmission roller 32. The pole piece substrate 2 is wound and unwound by the cooperation between the first transmission roller 31 and the second transmission roller 32, thereby moving the copper foil from the position of the first transmission roller 31 to the position of the second transmission roller 32. The coating device 1 is located between the first transmission roller 31 and the second transmission roller 32. That is, the copper foil is wound on the first transmission roller 31, and the first transmission roller 31 rotates and transfers the copper foil toward the second transmission roller 32 to realize the unwinding operation. After the copper foil forms the lithium battery anode, it is rewound by the second transmission roller, which facilitates the storage and transportation of the lithium battery anode.

[0046] Specifically, as shown in Figure 2 , the coating apparatus 1 includes a coating assembly 11 and a leveling assembly 12. The coating assembly 11 is capable of spraying a lithium alloy slurry onto the copper foil. The leveling assembly 12 is located in front of the coating assembly 11, i.e., to the right of the coating assembly 11, along the direction of movement of the copper foil. The leveling assembly 12 is used to adjust the thickness of the lithium alloy slurry applied to the copper foil surface. The copper foil moves rightward as shown in Figure 2 .

[0047] Furthermore, in this embodiment, the coating assembly 12 is provided in three groups: a first coating assembly 12a, a second coating assembly 12b, and a third coating assembly 12c, which are arranged sequentially along the direction of movement of the copper foil. Each group of coating assemblies 12 includes two coating rollers 121, which are symmetrically arranged on either side of the copper foil in the thickness direction and spaced apart from the copper foil. The thickness of the lithium alloy slurry on the copper foil surface is adjusted by adjusting the distance between the coating rollers and the copper foil.

[0048] In summary, in the processing equipment for the lithium battery anode of the present embodiment, a coating device is provided and a lithium alloy slurry is coated on the surface of the copper foil to form a lithium battery anode. The good ductility of metallic copper compared to metallic lithium can be used to reduce the thickness of the lithium battery anode. At the same time, three sets of flattening components are provided in the coating device, so that the thickness of the lithium alloy slurry on the copper foil can be adjusted multiple times, thereby achieving the technical effect of improving the thickness dimensional accuracy of the lithium electrode anode.

[0049] In addition, as shown in Figure 2, a preset distance is set between the two coating rollers 121 in each group of coating components 12, and along the moving direction of the copper foil, the preset distance between the two coating rollers 121 in each coating component 12 and the copper foil decreases successively, and the preset distance between the two coating rollers in a group of coating components away from the coating component is the required thickness of the lithium battery anode, that is, the distance between the two coating rollers in the first coating component 12a is greater than the distance between the two coating rollers in the second coating component 12b. The distance between the two coating rollers in the third coating component 12c, and the distance between the two coating rollers in the third coating roller group is equal to the thickness of the lithium battery anode required in this embodiment.

[0050] Based on this, the coating device can gradually adjust the thickness of the coated lithium alloy slurry in a step-by-step manner to improve the uniformity of the lithium alloy slurry coating, and avoid the situation where when a group of coating devices are set up to adjust the lithium alloy slurry on the surface of the copper foil, there will be gaps in the lithium alloy slurry on part of the copper foil surface, which will affect the uniformity of the lithium alloy slurry on the copper foil surface.

[0051] In addition, as shown in FIG4 , in this embodiment, the coating roller includes a roller body 122, a first outer wheel 123, and a second outer wheel 124. The width of the roller body 122 is equal to the width of the lithium battery anode. The diameters of the first outer wheel 123 and the second outer wheel 124 are both larger than the diameter of the roller body 122. The first outer wheel 123 is connected to the first end face of the roller body 122, and the second outer wheel 124 is connected to the second end face of the roller body 122. The first and second outer wheels can limit the position of the copper foil along its own width direction, preventing positional deviation between the cylindrical foil and the roller body, thereby achieving the effect of improving the positional stability of the copper foil during transmission.

[0052] Among them, the first end face of the roller body 122 and the first outer wheel 123, as well as the second end face of the roller body 122 and the second outer wheel 124 can be detachably connected, for example, by using a threaded connection. In this way, when replacing copper foils of different widths, only the roller body needs to be replaced without replacing the first outer wheel and the second outer wheel, so that the first outer wheel and the second outer wheel can be reused to reduce the processing cost of the lithium battery anode.

[0053] Furthermore, slurry grooves 125 are provided on the surfaces where the first outer wheel 123 connects to the roller body 122, as well as on the surfaces where the second outer wheel 124 connects to the roller body 122. When adjusting the thickness of the lithium alloy slurry on the copper foil surface, a small amount of lithium alloy slurry will adhere to the surface of the roller body. As the roller body rolls, excess lithium alloy slurry will enter the slurry grooves, thereby extending the service life of the coating roller, reducing the number of times the coating roller needs to be replaced and cleaned, and thus improving the processing speed of lithium battery anodes.

[0054] In addition, in combination with Figure 2, in this embodiment, the coating component 11 includes a hot melt kettle 111, a lithium melting kettle 112 and an injection nozzle 113. The feed end of the hot melt kettle 111 is connected to the lithium melting kettle 112, which is used to melt lithium metal and alloy the molten lithium metal to form a viscous lithium alloy slurry. The discharge end of the hot melt kettle 111 is connected to the injection nozzle 113, which is used to stir and provide lithium alloy slurry to the injection nozzle 113 to improve the uniformity of the lithium alloy slurry. At the same time, the hot melt kettle 111 also has a heating function to ensure that the lithium alloy slurry can always be in a molten state. The injection nozzle 113 is used to apply the lithium alloy slurry to the copper foil.

[0055] The hot melt kettle 111 is provided with stirring blades to stir the lithium alloy slurry, and the stirring speed of the stirring blades can be adjusted. Specifically, the stirring blades can be driven to rotate by a servo motor, and the rotation speed of the stirring blades can be adjusted as needed.

[0056] Based on this, the battery electrode processing equipment also includes a heating device, such as a hot air heating device. The heating device is located at the position where the copper foil is about to be transferred to the coating assembly. It can heat the copper foil to keep the lithium alloy slurry in a molten state during the coating process, thereby improving the leveling effect of the lithium alloy slurry and preventing the copper foil from losing the temperature of the lithium alloy slurry, which would cause the molten state of the lithium alloy slurry to be unstable and affect the coating effect.

[0057] In other embodiments, the coating assembly may also be provided with only a hot melt kettle and an injection nozzle. The hot melt kettle can not only melt lithium metal, but also alloy the molten lithium metal, and can also stir the lithium metal slurry to improve the uniformity of the lithium metal slurry.

[0058] In addition, in this embodiment, the plane where the electrode substrate is located is parallel to the horizontal plane. As shown in Figure 2, the coating assembly 11 is provided with two groups, namely the first coating assembly and the second coating assembly, which are respectively located above and below the copper foil. The coating assembly 11 can simultaneously coat the copper foil on both sides to improve the coating efficiency.

[0059] Based on this, the first coating assembly is located above the copper foil, and the second coating assembly is located below the copper foil. The first and second coating assemblies spray a viscous lithium alloy slurry onto the surface of the copper foil. This allows the lithium alloy slurry to adhere to the copper foil and avoid dripping, thereby reducing the amount of lithium alloy slurry used and achieving the technical effect of reducing usage costs. At the same time, the dripping of lithium alloy slurry is prevented from affecting the thickness of the lithium battery anode, thereby achieving the effect of improving the accuracy of the lithium battery anode thickness.

[0060] Of course, in other embodiments, the number of coating components may be adjusted according to different injection efficiencies.

[0061] Furthermore, in other embodiments, according to the length and thickness of the copper foil and the different placement positions, the positions of the first coating assembly and the second coating assembly need to be adjusted accordingly.

[0062] Furthermore, in this embodiment, the injection nozzle 113 reciprocates parallel to the width of the electrode substrate 2. That is, the movement direction of the injection nozzle 113 is parallel to the width of the copper foil and moves at a constant speed, thereby improving the uniformity of the lithium metal slurry sprayed by the injection nozzle. At the same time, the injection nozzle 113 can coordinate with the movement direction of the copper foil, so that the coating trajectory is an arc, and the lithium alloy slurry can be fully distributed on the copper foil.

[0063] Of course, in other embodiments, depending on the spraying range of the injection nozzle, the injection nozzle can also cover the entire width of the copper foil. In this way, the technical effect of uniform coating of the injection nozzle can also be achieved without moving the injection nozzle.

[0064] In addition, as shown in FIG3 , in this embodiment, the electrode sheet processing equipment preferably further includes a cooling device 4 . Along the moving direction of the copper foil, the cooling device 4 is located in front of the coating assembly 11 , that is, the cooling device 4 is located to the right of the coating assembly 11 . It can cool the lithium alloy slurry on the copper foil and increase the cooling rate, thereby shortening the lithium battery anode production cycle and achieving the effect of increasing the lithium battery anode production speed. The cooling device can be an air cooling device.

[0065] In addition, the lithium battery anode processing equipment also includes a central control device 5, a first temperature measuring device 6, and a second temperature measuring device 7. Along the direction of movement of the copper foil, the first temperature measuring device 6 is located behind the coating assembly 11, that is, the first temperature measuring device 6 is located to the left of the coating assembly 1. Specifically, the first temperature measuring device 6 can be located within the heating device to detect the surface temperature of the copper foil before coating. The second temperature measuring device 7 is located within the coating assembly 11 and can be located above the copper foil to detect the temperature of the copper foil position within the coating assembly.

[0066] Furthermore, the first temperature measuring device 6 and the second temperature measuring device 7 are electrically connected to the central control device 5 respectively, and upload the detected temperature to the central control device 5. The central control device 5 can analyze and compare the temperature detected by the first temperature measuring device 6 and the temperature detected by the second temperature measuring device 7, that is, detect the temperature before the copper foil is coated and the temperature difference in the coating component to prevent the temperature difference from being too large to consume the temperature of the lithium metal slurry in the coating component and affect the coating effect.

[0067] Specifically, the central control device controls a red light electrically connected thereto to light up, and at the same time, the central control device controls an alarm electrically connected thereto to sound, indicating that the temperature of the copper foil before coating needs to be adjusted.

[0068] Furthermore, as shown in FIG3 , the lithium battery anode processing equipment further includes a third temperature measuring device 8 and a fourth temperature measuring device 9. The third temperature measuring device 8 is located in the cooling device 4 and in front of the cooling device 4 along the moving direction of the copper foil. The third temperature measuring device 8 and the fourth temperature measuring device 9 are both located above the copper foil and are electrically connected to the central control device 5.

[0069] Specifically, the temperature inside the cooling device is detected by the third temperature measuring device, and the temperature of the copper foil after cooling is detected by the fourth temperature measuring device, and are uploaded to the central control device respectively. The central control device monitors the temperature difference between the third temperature measuring device and the fourth temperature measuring device as the basis for adjusting the cooling speed of the cooling device to ensure that the surface temperature of the copper foil is suitable for rolling up and storage.

[0070] The specific operating steps of the battery electrode processing equipment in this embodiment are as follows:

[0071] Step S1: Preparation of the battery electrode processing equipment. The central control device 5 is used to set the operating parameters of the battery electrode processing equipment, including but not limited to the operating speeds of the first drive roller 31 and the second drive roller 32, the heating and melting temperature of the hot melt kettle 111, the stirring speed in the lithium melting kettle 112, and the cooling speed of the cooling device.

[0072] Step S2: Formation of lithium metal slurry. Lithium metal is placed in the lithium melting kettle 112 for melting. The molten lithium metal is then alloyed to form a viscous lithium alloy slurry, which is then transferred to the hot melting kettle 111.

[0073] Step S3: Coating of lithium metal slurry: First, a fifth temperature measuring device is provided in the hot melt kettle so that the fifth temperature measuring device continuously detects the temperature in the hot melt kettle and uploads the detected temperature to the central control device 5 .

[0074] Then, when the temperature in the hot melt kettle 111 reaches the set working temperature, that is, when it is possible to ensure that the lithium metal is in the form of slurry, the central control device 5 controls the hot melt kettle 111 to continuously stir the lithium metal slurry.

[0075] When the temperature in the hot melt kettle 111 does not reach the set working temperature, the central control device 5 simultaneously starts the stirring program and the heating program in the hot melt kettle until the set working temperature is reached, so that the lithium metal slurry is always in a molten state.

[0076] Finally, the stirred lithium alloy slurry is sprayed onto the copper foil via injection nozzle 113. This nozzle 113 moves at a constant speed parallel to the width of the copper foil to ensure uniformity in the application of the lithium metal slurry. The copper foil coated with the lithium alloy slurry then passes through the first, second, and third leveling assemblies 12a, 12b, and 12c, achieving the desired thickness for the lithium battery anode in this embodiment.

[0077] Of course, in other embodiments, when the temperature in the hot melt kettle does not reach the set working temperature in step S3, the central control device can first start the heating program in the hot melt kettle, and then start the stirring process to stir the lithium metal slurry after reaching the set working temperature.

[0078] Step S4, starting the driving device 3 and the cooling device 4. Starting the driving device 3 and the cooling device 4 enables the automatic coating of the copper foil and the storage and transportation of the copper foil after coating. The cooling device 4 can accelerate the cooling speed of the copper foil with the lithium alloy slurry.

[0079] At the same time, the central control device 5 monitors the temperatures measured by the first temperature measuring device 6, the second temperature measuring device 7, the third temperature measuring device 8 and the fourth temperature measuring device 9 in real time, and also monitors the temperature difference between the first temperature measuring device 6 and the second temperature measuring device 7 and the temperature difference between the third temperature measuring device 8 and the fourth temperature measuring device 9, so as to make real-time adjustments to the heating speed of the heating device and the cooling speed of the cooling device.

[0080] The above description is only an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the scope of protection of the present invention.

Claims

1. A battery pole piece processing equipment, characterized in that: It comprises a coating device and a driving device; the driving device is used to drive the pole piece substrate to move along its length direction, and the coating device is used to coat the metal slurry on the surface of the pole piece substrate; The coating device comprises a coating component and a leveling component, wherein the coating component can spray the metal slurry onto the pole piece substrate; along the moving direction of the pole piece substrate, the leveling component is located in front of the coating component and is used to adjust the thickness of the metal slurry on the pole piece substrate; The coating assembly is provided with at least two groups, and each group of the coating assembly comprises two coating rollers, which are respectively located on both sides of the pole piece substrate along its own thickness direction and are spaced apart from the pole piece substrate.

2. The battery pole piece processing equipment according to claim 1, characterized in that: A preset distance is respectively set between the two coating rollers in each group of the coating components, and along the moving direction of the pole piece substrate, the preset distance between the two coating rollers in each group of the coating components decreases successively.

3. The battery pole piece processing equipment according to claim 1, characterized in that: The coating assembly includes a hot melt kettle and an injection nozzle; The injection nozzle can spray the metal slurry onto the pole piece substrate; the hot melt kettle is connected to the injection nozzle and is used to provide the metal slurry to the injection nozzle.

4. The battery pole piece processing equipment according to claim 3, characterized in that: The injection nozzle reciprocates along a width direction parallel to the pole piece substrate.

5. The battery pole piece processing equipment according to claim 1, characterized in that: The plane where the pole piece substrate is located is parallel to the horizontal plane, and at least two groups of coating components are provided, which are respectively located above and below the pole piece substrate.

6. The battery pole piece processing equipment according to claim 1, characterized in that: The coating roller comprises a roller body, a first outer wheel and a second outer wheel; The width of the roller body is the same as the width of the pole piece substrate, the diameter of the first outer wheel and the diameter of the second outer wheel are both larger than the diameter of the roller body; the first outer wheel is connected to the first end face of the roller body, and the second outer wheel is connected to the second end face of the roller body.

7. The battery pole piece processing equipment according to claim 6, characterized in that: The connection surface of the first outer wheel and the roller body and the connection surface of the second outer wheel and the roller body are both provided with slurry containing grooves.

8. The battery pole piece processing equipment according to claim 1, characterized in that: Also includes a cooling device; Along the moving direction of the pole piece substrate, the cooling device is located in front of the coating device, and is used to cool the metal slurry on the pole piece substrate.

9. The battery pole piece processing equipment according to claim 8, characterized in that: It also includes a central control device, a first temperature measuring device and a second temperature measuring device; Along the moving direction of the electrode substrate, the first temperature measuring device is located behind the coating assembly, and is used to detect the temperature of the electrode substrate before coating; the second temperature measuring device is located inside the coating assembly, and is used to detect the temperature inside the coating assembly; the first temperature measuring device and the second temperature measuring device are both electrically connected to the central control device.

10. The battery pole piece processing equipment according to claim 9, characterized in that: It also includes a third temperature measuring device and a fourth temperature measuring device; the third temperature measuring device is located in the cooling device and is used to detect the temperature in the cooling device; along the moving direction of the electrode substrate, the fourth temperature measuring device is located in front of the cooling device and is used to detect the temperature of the electrode substrate after cooling, and the third temperature measuring device and the fourth temperature measuring device are both electrically connected to the central control device.

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