Spraying device for battery electrode sheet, and manufacturing device for battery electrode sheet

Abstract

A spraying device (104) for a battery electrode sheet, and a manufacturing device (100) for a battery electrode sheet. The spraying device (104) comprises: a spraying portion (204), wherein the spraying portion (204) comprises a cavity (304) used for accommodating a molten coating material (303) to be sprayed onto a battery electrode sheet, and a nozzle (207), the nozzle (207) being in fluid connection with the cavity (304), so that the molten coating material (303) can be sprayed onto the battery electrode sheet from the nozzle (207); and a deformation assembly, wherein the deformation assembly is arranged in the cavity (304), and when powered on, the deformation assembly deforms to change the volume of the cavity (304) used for accommodating the molten coating material (303).

Description

Spraying device and preparation equipment for battery pole pieces

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 2024102432516 filed on March 1, 2024, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to the technical field of battery pole piece processing, and in particular to a spraying device and preparation equipment for battery pole pieces. Background Art

[0004] Battery pole sheets are a crucial component of batteries. During production, they are coated with active electrode materials, such as lithium metal. Physical lamination is commonly used in existing technologies, where the pole sheets and active electrode materials are rolled together to form a composite, forcing the active electrode material onto the surface of the pole sheets.

[0005] However, in the actual production of battery pole pieces, since the electrode active materials, such as metallic lithium, are soft, the method of rolling them onto the surface of the current collector by physical compounding often leads to a series of problems. For example, the resulting composite pole pieces have poor stability and low efficiency, and are prone to breakage, poor thickness uniformity, and uneven edges due to edge extrusion and extension.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a spraying device and preparation equipment for battery pole pieces to alleviate, reduce or eliminate the problems arising in the process of producing composite pole pieces by physical rolling.

[0008] In the first aspect, the present application provides a spraying device for battery pole pieces, comprising: a spraying part, the spraying part comprising: a cavity for accommodating molten paint to be sprayed onto the battery pole piece; and a nozzle, the nozzle is fluidically connected to the cavity so that the molten paint can be sprayed from the nozzle onto the battery pole piece; and a deforming component, the deforming component is arranged in the cavity, wherein the deforming component deforms when power is supplied to change the volume of the cavity for accommodating the molten paint.

[0009] In the technical solution of the embodiment of the present application, the battery electrode sheets are composited using a non-contact spraying method of spraying molten coating onto the battery electrode sheets. This can effectively avoid problems such as broken strips, poor thickness uniformity, and uneven edges caused by edge extrusion and extension, thereby improving the yield rate of the composite battery electrode sheets, thereby reducing manufacturing costs and improving production efficiency. In addition, unlike traditional physical roller-pressing composites that require the use of a protective film during the rolling process, the above embodiment can also avoid the risk of the protective film sticking, promote the formation of a uniform coating on the surface of the battery electrode sheets, ensure the performance and stability of the battery, and thus improve the efficiency and cycle life of the battery.

[0010] In some embodiments, the deformation assembly includes: a piezoelectric element that deforms when energized; and a deformation member that is disposed between the piezoelectric element and the molten paint in the cavity and is configured to contact the piezoelectric element so as to deform in response to the deformation of the piezoelectric element, thereby changing the volume of the cavity for accommodating the molten paint. In the above embodiment, the simple structure of the piezoelectric element and the deformation member achieves the function of changing the volume of the cavity for accommodating the molten paint, and its structure is relatively simple, which makes the spraying device more stable and reliable while reducing manufacturing and maintenance costs. In addition, because the piezoelectric element can deform quickly when energized, the spraying device can adjust the amount of paint sprayed in a short time. This is very important for real-time adjustment during the production process and is conducive to promoting production efficiency and product quality.

[0011] In some embodiments, the degree of deformation of the piezoelectric element depends on the magnitude of the current flowing through it. This embodiment, on the one hand, controls the degree of deformation by controlling the magnitude of the current, further improving the spray device's control over the amount of paint, thereby improving production efficiency and product quality. On the other hand, the magnitude of the current can be adjusted according to actual needs, avoiding energy waste.

[0012] In some embodiments, the deformable member includes at least one of a plate or a diaphragm. In such an embodiment, the deformable member has a simple structure and is easier to manufacture.

[0013] In some embodiments, the spraying device further includes a paint reservoir for storing molten paint, with an outlet of the paint reservoir fluidly connected to the cavity via a feed line. The above embodiments provide a paint reservoir for storing molten paint, and this fluid connection allows for a stable supply of molten paint to the cavity, facilitating consistent and uniform spraying of the paint.

[0014] In some embodiments, the paint storage portion has a vacuum or argon environment. The vacuum or argon environment in the above embodiment can effectively prevent the molten paint from being contaminated by oxygen or other impurities, helping to maintain the purity and stability of the paint.

[0015] In some embodiments, the spraying device further includes a heating unit for maintaining the temperature of the molten paint sprayed from the nozzle. In the above embodiments, the heating unit maintains an appropriate temperature to maintain the fluidity of the paint. This helps ensure smooth paint flow when sprayed from the nozzle, preventing coagulation or partial coagulation of the paint during spraying, which can cause blockage and uneven spraying. This improves paint utilization, reduces paint waste, and ensures spray quality.

[0016] In some embodiments, the spraying device further includes a support roller, which is used to support the battery electrode, and a coolant flows through the support roller to cool the molten coating sprayed on the battery electrode. The support roller in the above embodiment supports the composite electrode, ensuring that the composite electrode remains flat and level as it passes through the roller, thereby ensuring the quality of the spraying. Furthermore, the coolant flowing through the support roller effectively reduces the temperature of the molten coating sprayed on the battery electrode, which helps improve the uniformity and adhesion of the coating on the battery electrode surface.

[0017] In the second aspect, the present application provides a preparation device for battery pole sheets, comprising: at least one spraying device according to any one of at least one of the above embodiments, the spraying device being arranged in the conveying direction of the battery pole sheets; and a cooling device, the cooling device being arranged in the conveying direction of the battery pole sheets and downstream of the spraying device, for cooling the battery pole sheets passing through the spraying device.

[0018] Such a preparation device can provide the advantages described above for the spraying device, which will not be repeated for the sake of brevity. In addition, the cooling device can effectively reduce the temperature of the battery electrode after passing through the spraying device, helping to solidify the molten coating and ensure the quality and uniformity of the coating.

[0019] In some embodiments, the preparation equipment further includes: an unwinding device for unwinding the wound battery electrode sheet and sending it downstream; a first tension adjustment device, disposed downstream of the unwinding device, for stretching and flattening the battery electrode sheet; a correction device, disposed downstream of the first tension adjustment device and upstream of at least one spraying device, for keeping the spraying edge parallel to the edge of the battery electrode sheet; a second tension adjustment device, disposed downstream of the cooling device, for stretching and flattening the battery electrode sheet after spraying; a thickness measuring device, disposed downstream of the second tension adjustment device, for measuring the thickness of the battery electrode sheet; and a winding device, disposed downstream of the thickness measuring device, for winding up the battery electrode sheet. The above embodiment can complete the entire process of battery electrode sheet preparation, realize automated control of the battery electrode sheet preparation process, reduce manual intervention, and improve production efficiency and consistency.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0022] FIG1 is a schematic diagram of a spraying device for battery pole pieces according to some embodiments of the present application;

[0023] FIG2 is a schematic diagram showing a partially enlarged portion and a spray head of the spraying device in FIG1 ;

[0024] FIG3 is a schematic diagram showing the spraying device in FIG2 when no power is supplied;

[0025] FIG4 is a schematic diagram showing the spraying device in FIG2 when powered on;

[0026] FIG5 is a schematic diagram of a device for preparing battery pole pieces according to some embodiments of the present application. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0029] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0030] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0032] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0035] At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. As the application fields of power batteries continue to expand, the market demand is also constantly increasing.

[0036] With the development of modern manufacturing industry, most of the existing equipment for preparing battery pole pieces relies on rolling to composite the battery pole pieces with electrode active materials, such as metallic lithium. The electrode active materials, such as metallic lithium, can be rolled onto the battery pole pieces, such as the surface of copper foil, by physical compounding. However, since the electrode active materials, such as metallic lithium, are soft, the use of physical compounding often results in quality problems such as broken strips, poor thickness uniformity, and uneven edges. In addition, direct physical rolling is generally limited by the quality of the electrode active materials, has a low speed, and is not conducive to mass production. Therefore, this method of rolling the electrode active material onto the surface of the battery pole piece by physical compounding not only has poor stability of the resulting battery pole piece, but also has low production efficiency.

[0037] Based on the above considerations, in order to alleviate, reduce or eliminate the problems arising in the process of producing composite pole sheets by physical rolling, a spraying device and preparation equipment for battery pole sheets are designed. The battery pole sheets are composited by a non-contact spraying method in which molten coating is sprayed onto the battery pole sheets. This can effectively avoid problems such as broken strips, poor thickness uniformity, and uneven edges caused by edge extrusion and extension, thereby improving the yield of composite battery pole sheets, thereby reducing manufacturing costs and improving production efficiency.

[0038] The spray coating device for battery pole pieces disclosed in the embodiments of this application can be used, but is not limited to, for spraying electrode active materials on battery pole pieces, such as for spraying molten lithium metal on battery negative pole pieces. A battery pole piece preparation device equipped with the spray coating device disclosed in this application can be used.

[0039] Figure 1 is a schematic diagram of a spraying device 104 for battery electrodes in some embodiments of the present application; Figure 2 is a schematic diagram showing a locally enlarged portion of the spraying device 104 and the nozzle 207 in Figure 1; Figure 3 is a schematic diagram showing the spraying device 104 in Figure 2 when it is not powered; Figure 4 is a schematic diagram showing the spraying device 104 in Figure 2 when it is powered.

[0040] As shown in Figures 1 to 4, an embodiment of the present application provides a spraying device 104 for a battery electrode. The spraying device 104 includes a spraying portion 204 and a deforming component. The spraying portion 204 includes a cavity 304 and a nozzle 207. The cavity 304 is used to accommodate molten paint 303 to be sprayed onto the battery electrode. The nozzle 207 is fluidically connected to the cavity 304 so that the molten paint 303 can be sprayed from the nozzle 207 onto the battery electrode. The deforming component is disposed in the cavity 304. When energized, the deforming component deforms to change the volume of the cavity 304 for accommodating the molten paint 303.

[0041] Referring to Figure 1, direction 205 indicates the direction in which the battery electrode sheets are conveyed. After being sprayed with the molten coating 303, the battery electrode sheets can be conveyed along conveying direction 205 to the next process step. Because the entire equipment operates in a non-contact, high-efficiency spraying mode, the theoretical maximum conveying speed of the battery electrode sheets can reach 80 m / min. Compared to roller lamination, where the speed is limited by the quality of the incoming material, the lamination speed is generally between 10 and 20 m / min.

[0042] As shown in FIG2 , there can be multiple nozzles 207 , for example, nine nozzles 207 , and the nozzles 207 can be arranged in a queue along the width direction of the battery electrode sheet, for example, in one row or multiple rows. It is understood that the number of nozzles 207 (or the number of nozzles 207 used) can be varied according to actual needs, for example, according to factors such as the width of the battery electrode sheet being sprayed.

[0043] In the example shown in Figures 3 and 4, the deformable component changes the volume of cavity 304 for accommodating molten coating 303 when energized. Molten coating 303 can be squeezed out of cavity 304, for example, by extrusion, and then sprayed onto the battery electrode. It is understood that molten coating 303 can be a suitable electrode active material for the battery electrode, for example, molten coating 303 can be molten lithium metal used as a battery negative electrode material.

[0044] The battery pole pieces are composited using a non-contact spraying method that applies molten coating to the battery pole pieces. By controlling the amount of molten coating and the coating accuracy, problems such as broken strips, poor thickness uniformity, and uneven edges caused by edge extrusion and extension can be effectively avoided. This can improve the yield rate of the composite battery pole pieces, thereby reducing manufacturing costs and improving production efficiency. In addition, unlike traditional physical roller-pressing composites, which require the use of a protective film during the rolling process, the above embodiment can also avoid the risk of the protective film sticking, promote the formation of a uniform coating on the surface of the battery pole piece, and ensure the performance and stability of the battery, thereby improving the efficiency and cycle life of the battery.

[0045] According to some embodiments of the present application, the deformation assembly includes a piezoelectric element 301 and a deformable member 302. The piezoelectric element 301 deforms when energized. The deformable member 302 is disposed between the piezoelectric element 301 and the molten coating 303 within a cavity 304 and is configured to contact the piezoelectric element 301. The deformable member 302 deforms in response to the deformation of the piezoelectric element 301, thereby changing the volume of the cavity 304 for accommodating the molten coating 303.

[0046] In the examples shown in Figures 3 and 4, the deformable member 302 can be arranged below the piezoelectric element 301, and the piezoelectric element 301 transfers deformation to the deformable member 302 when current passes through it. It is understandable that the deformable member 302 changes the volume of the cavity 304 for accommodating the molten coating 303 so that the molten coating 303 is squeezed out of the cavity 304 (as shown in Figure 4), thereby achieving spraying onto the battery electrode. Specifically, the deformable member 302 can be by directly squeezing the molten coating 303 contained in the cavity 304. However, it is understandable that the deformable member 302 can also be by squeezing the air in the cavity 304 so that the molten coating 303 is squeezed out of the cavity 304.

[0047] In some embodiments, the strength of the deformable member 302 is greater than the strength of the piezoelectric element 301. It is understood that the deformable member 302 can be a vibration plate or other materials with appropriate strength.

[0048] The simple structure of the piezoelectric element and the deformable member achieves the function of changing the volume of the cavity used to hold the molten paint. This relatively simple structure makes the spray device more stable and reliable, while also reducing manufacturing and maintenance costs. Furthermore, because the piezoelectric element can deform rapidly when energized, the spray device can adjust the amount of paint sprayed in a short period of time. This is crucial for real-time adjustments during the production process, improving production efficiency and product quality.

[0049] According to some embodiments of the present application, the degree of deformation of the piezoelectric element 301 depends on the magnitude of the current flowing through the piezoelectric element 301 .

[0050] In some embodiments, the relationship between the deformation degree of the piezoelectric element 301 and the current flowing through the piezoelectric element 301 may be a proportional increase or decrease, or a proportional change with a certain slope and intercept (where the slope is not 0).

[0051] On the one hand, the above embodiment controls the degree of deformation by controlling the current, further improving the control accuracy of the spraying device on the amount of paint, which is beneficial to improving production efficiency and product quality; on the other hand, the current can be adjusted according to actual needs to avoid energy waste.

[0052] According to some embodiments of the present application, the deformable member 302 includes at least one of a plate or a diaphragm.

[0053] 3 and 4 , the deformable member 302 may include a diaphragm. It is understood that the size of the deformable member 302 is adapted to the size of the piezoelectric element.

[0054] In such an embodiment, the deformation member has a simple structure and is easier to manufacture.

[0055] According to some embodiments of the present application, the spraying device 104 further includes a paint storage portion 203 for storing molten paint 303 , and an outlet of the paint storage portion 203 is fluidically connected to the cavity 304 via a feed pipeline.

[0056] As shown in FIG1 , the paint storage portion 203 can be configured in a funnel shape. It is understood that the paint storage portion 203 can also be configured in other shapes suitable for storing molten paint 303. In some embodiments, the paint storage portion 203 is primarily made of 304 / 316 stainless steel, and the internal ambient temperature of the paint storage portion 203 is 180° C. to 210° C.

[0057] The above embodiment is provided with a paint storage portion 203 for storing molten paint, which can stably supply molten paint to the cavity 304 through a fluid connection, which is beneficial to maintaining the consistency and uniformity of the amount of sprayed paint.

[0058] According to some embodiments of the present application, the paint storage portion 203 has a vacuum or argon environment.

[0059] In some embodiments, when the paint storage unit 203 is in an argon atmosphere, the carbon dioxide content, oxygen content, and moisture content need to be monitored simultaneously. In some embodiments, the carbon dioxide content, oxygen content, and moisture content are less than 0.1 ppm.

[0060] The vacuum or argon environment in the above embodiment can effectively prevent the molten coating from being contaminated by oxygen or other impurities, and helps to maintain the purity and stability of the coating.

[0061] According to some embodiments of the present application, the spraying device 104 further includes a heating portion 202 , which is used to maintain the temperature of the molten coating 303 sprayed from the nozzle 207 .

[0062] 1 , the heating unit 202 can be configured to be close to the spraying unit 204 to facilitate heating the molten coating 303 sprayed from the nozzle 207. In some embodiments, the heating unit 202 maintains the temperature of the molten coating 303 sprayed from the nozzle 207 at 180°C.

[0063] As shown in FIG. 5 , it can be understood that the heating portion 202 can form a closed loop with the internal temperature monitoring system of the entire preparation equipment 100 .

[0064] In the above embodiment, the heating part can maintain an appropriate temperature to maintain the fluidity of the paint, which helps to ensure that the paint can flow smoothly when sprayed out of the nozzle, avoiding coagulation or partial coagulation of the paint during the spraying process, thereby causing blockage and uneven spraying, which is beneficial to improving the utilization rate of the paint, reducing paint waste, and ensuring the quality of spraying.

[0065] According to some embodiments of the present application, the spraying device 104 further includes a support roller 201 for supporting the battery pole piece, and a coolant 206 flows through the inside of the support roller 201 to cool the molten coating 303 sprayed on the battery pole piece.

[0066] As shown in the examples of FIG. 1 and FIG. 2 , the support roller 201 supports the battery electrode sheet. The support roller 201 can keep the battery electrode sheet flat and level at all times when passing through the roller.

[0067] In addition, the type of the coolant 206 flowing through the support roller 201 can be oil, such as one or more of mineral oil, synthetic oil, or emulsified oil. It is understood that the coolant 206 can also be water, such as 10°C cooling water.

[0068] The support roller in the above embodiment supports the composite electrode sheet, ensuring that it remains flat and level as it passes through the roller, thus ensuring high-quality spraying. Furthermore, the coolant flowing through the support roller effectively reduces the temperature of the molten coating applied to the battery electrode sheet, helping to improve the coating's uniformity and adhesion on the electrode sheet surface.

[0069] FIG5 is a schematic diagram of a battery electrode sheet manufacturing apparatus 100 according to some embodiments of the present application. The battery electrode sheet manufacturing apparatus 100 includes at least one spraying device 104 according to at least one of the aforementioned embodiments and a cooling device 105. The spraying device 104 is positioned in the conveying direction 205 of the battery electrode sheets. The cooling device 105 is positioned downstream of the spraying device 104 in the conveying direction 205 of the battery electrode sheets, and is used to cool the battery electrode sheets after they have passed through the spraying device 104.

[0070] As shown in Figure 5, after the battery electrode is sprayed with molten coating 303 by the spraying device 104, it enters the cooling device 105. In this example, the cooling device 105 controls the internal temperature to be constant at 20-60°C.

[0071] Such a production apparatus 100 can provide the advantages described above with respect to the spraying device 104, which will not be further elaborated for the sake of brevity. Furthermore, the cooling device 105 can effectively reduce the temperature of the battery electrode sheet passing through the spraying device 104, thereby helping to solidify the molten coating 303 and ensure the quality and uniformity of the coating. The specific structure and function of the spraying device 104 in the production apparatus 100 have been described in detail above.

[0072] According to some embodiments of the present application, the preparation equipment 100 further includes an unwinding device 101, a first tension adjusting device 102, a deviation correcting device 103, a second tension adjusting device 106, a thickness measuring device 107, and a winding device 108. The unwinding device 101 is used to unfold the wound battery electrode sheet and send it downstream. The first tension adjusting device 102 is arranged downstream of the unwinding device 101 and is used to stretch and flatten the battery electrode sheet. The deviation correcting device 103 is arranged downstream of the first tension adjusting device 102 and upstream of at least one spraying device 104 according to at least one of the above embodiments, and is used to keep the spraying edge parallel to the edge of the battery electrode sheet. The second tension adjusting device 106 is arranged downstream of the cooling device 105 and is used to stretch and flatten the battery electrode sheet after spraying. The thickness measuring device 107 is arranged downstream of the second tension adjusting device 106 and is used to measure the thickness of the battery electrode sheet. The winding device 108 is arranged downstream of the thickness measuring device 107 and is used to wind up the battery electrode sheet.

[0073] As shown in FIG5 , the first tension adjustment device 102 and the second tension adjustment device 106 can each be constructed from three tensioning pulleys. It is understood that the first tension adjustment device 102 and the second tension adjustment device 106 can also be constructed from other structures, and the first tension adjustment device 102 and the second tension adjustment device 106 can use different implementations to achieve tension adjustment. In some embodiments, the tension adjustment range is 1 to 3N.

[0074] In the example shown in Figure 5, the correction device 103 can detect the height difference and / or color difference between the sprayed area and the unsprayed area on the battery electrode by means of laser and / or infrared, thereby detecting the tape running deviation of the preparation equipment 100 to make appropriate adjustments to ensure the manufacturing accuracy of the preparation equipment 100. In some embodiments, the deviation range of the correction device 103 is less than 0.5mm.

[0075] The above-mentioned implementation method can complete the whole process operation of battery pole piece preparation, realize the automated control of the battery pole piece preparation process, reduce manual intervention, and improve production efficiency and consistency.

[0076] Description of reference numerals:

[0077] Preparation equipment 100, unwinding device 101, first tension adjusting device 102, deviation correcting device 103, spraying device 104, cooling device 105, second tension adjusting device 106, thickness measuring device 107, winding device 108;

[0078] Support roller 201, heating unit 202, paint storage unit 203, spraying unit 204, conveying direction 205, cooling liquid 206, spray head 207;

[0079] Piezoelectric element 301 , deformable element 302 , molten coating 303 , cavity 304 .

Claims

1. A spraying device for battery pole pieces, comprising: A spraying unit, comprising: a cavity for containing molten coating to be sprayed onto the battery pole piece; and a spray head, the spray head being fluidically connected to the cavity so that the molten coating can be sprayed from the spray head onto the battery electrode sheet; and A deformation component is arranged in the cavity, wherein the deformation component is deformed when powered to change the volume of the cavity for accommodating the molten paint.

2. The spraying device according to claim 1, wherein: The deformation component includes: a piezoelectric element that deforms when electricity is applied to the element; and A deformable member is disposed between the piezoelectric element and the molten paint in the cavity and is configured to contact the piezoelectric element so as to deform in response to deformation of the piezoelectric element, thereby changing the volume of the cavity for accommodating the molten paint.

3. The spraying device according to claim 2, wherein: The degree of deformation of the piezoelectric element depends on the magnitude of the current flowing through the piezoelectric element.

4. The spraying device according to claim 2, wherein: The deformable member includes at least one of a plate member and a diaphragm. 5 . The spraying device according to claim 1 , further comprising a paint storage portion for storing the molten paint, wherein an outlet of the paint storage portion is fluidically connected to the cavity via a feed pipeline.

6. The spraying device according to claim 5, wherein: The paint storage part has a vacuum or argon gas environment.

7. The spraying device according to any one of claims 1 to 4, further comprising a heating portion, wherein the heating portion is used to maintain the temperature of the molten paint sprayed from the spray head.

8. The spraying device according to any one of claims 1 to 4, further comprising a support roller, wherein the support roller is used to support the battery electrode, and a coolant flows through the inside of the support roller to cool the molten paint sprayed on the battery electrode.

9. A device for preparing a battery electrode, comprising: At least one spraying device according to any one of claims 1 to 8, wherein the spraying device is arranged in the conveying direction of the battery electrode sheet; as well as A cooling device is provided in the conveying direction of the battery pole piece and downstream of the spraying device, and is used for cooling the battery pole piece passing through the spraying device.

10. The apparatus according to claim 9, further comprising: An unwinding device, used to unwind the wound battery electrode and send it downstream; A first tension adjustment device, disposed downstream of the unwinding device, for stretching and flattening the battery electrode sheet; a deviation-correcting device, disposed downstream of the first tension adjusting device and upstream of the at least one spraying device, for maintaining a spraying edge parallel to an edge of the battery electrode sheet; A second tension adjustment device is provided downstream of the cooling device and is used to stretch and flatten the battery electrode after spraying; a thickness measuring device, disposed downstream of the second tension adjusting device, for measuring the thickness of the battery electrode; as well as The winding device is arranged downstream of the thickness measuring device and is used to wind up the battery electrode sheet.

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