Extrusion structure and metering extrusion film-forming device

Abstract

The utility model discloses an extrusion structure and an extrusion metering film forming device.The extrusion structure comprises a material storage space, a discharging channel and an extrusion opening, the material storage space is used for storing material powder, the discharging channel communicates with the material storage space, and the discharging channel is provided with a discharging opening far away from the material storage space; the extrusion opening is formed in the storage space or formed in the end, away from the discharging opening, of the discharging channel, and the extrusion opening is used for allowing the ultrasonic vibration head to stretch in and conduct extrusion and compaction on the material powder. In the powder extrusion process, the extrusion amount of the powder can be limited through the mutual communication effect of the extrusion opening and the discharging channel and the size structures of the extrusion opening and the discharging channel, it is ensured that the powder is extruded to form a film in a quantitative mode in the vibration extrusion process, and the film forming density can meet the process requirement; and the film forming quality of the pole piece material powder in electrode manufacturing is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, and in particular to an extrusion structure and a metering extrusion film forming device. BACKGROUND

[0002] Compared with wet electrode technology, dry electrode technology has many advantages, including lower cost, more environmental protection, higher energy density and better electrical performance, and is more suitable for large-scale production. On the one hand, the binder solvent used in the wet process is toxic and not environmentally friendly, on the other hand, baking is required in the wet process, and a large amount of energy is consumed when the solvent is recovered. Therefore, the dry process is simple in process flow, smaller in equipment footprint, and more suitable for large-scale production of electrode sheets because it does not require a solvent and reduces the baking and solvent recovery steps.

[0003] The dry electrode technology uses mixed electrode sheet material powder (such as including active material, conductive agent, binder, etc.) to extrude a film on the electrode sheet foil by rolling, achieving the effect of combining the material powder with the electrode sheet. However, the dry film forming method in the related art mostly adopts a rolling method, which lacks control of the material powder discharge amount, and is prone to problems of uneven film thickness and film density due to fluctuations in the material powder discharge amount, resulting in poor film forming quality, so that subsequent thinning is required using a multi-roller continuous pressing form, which is not conducive to improving manufacturing efficiency. UTILITY MODEL CONTENT

[0004] To solve at least one of the above technical problems, the present application provides an extrusion structure capable of metering control of material powder extrusion, thereby accurately controlling the material powder extrusion amount to adjust the film forming density. The technical solution adopted is as follows.

[0005] In a first aspect, the extrusion structure provided by the present application includes a storage space, a discharge channel and an extrusion opening. The storage space is used to store material powder. The discharge channel is connected to the storage space, and the discharge channel has a discharge port away from the storage space. The extrusion opening is provided in the storage space or at an end of the discharge channel away from the discharge port, and is used for the ultrasonic horn to extend into and extrude and vibrate the material powder.

[0006] In some embodiments of the first aspect of the present application, the storage space includes a material dropping groove, the material dropping groove is arranged inclinedly relative to the discharge channel, and the material dropping groove is connected to the discharge channel. The extrusion opening is located at the connection between the material dropping groove and the discharge channel.

[0007] In some embodiments of the first aspect of the present application, the discharge channel is vertically arranged, the material storage space comprises at least two material falling grooves, the two material falling grooves are symmetrically arranged relative to the discharge channel, and the extrusion opening is arranged at a joint of the two material falling grooves.

[0008] In some embodiments of the first aspect of the present application, a side wall of the material falling groove away from the discharge channel is provided with a relief gap, the relief gap is communicated to the extrusion opening, and the relief gap is used for extending the ultrasonic horn into the extrusion opening.

[0009] In the second aspect, the present application further provides a metering extrusion film forming device, comprising a material receiving surface and the extrusion structure provided in the first aspect, the material receiving surface is arranged at the discharge port, and the material receiving surface and the discharge port have a gap M therebetween.

[0010] In some embodiments of the second aspect of the present application, the metering extrusion film forming device further comprises a support roller arranged at a position spaced apart from the discharge port, the support roller is rotatable relative to the discharge port, a surface of the support roller facing the discharge port is used for winding an electrode sheet, and a surface of the electrode sheet facing the discharge port is formed as the material receiving surface.

[0011] In some embodiments of the second aspect of the present application, the support roller is provided with a temperature changing structure, and the temperature changing structure is used for heating or cooling the support roller.

[0012] In some embodiments of the second aspect of the present application, a heat exchange channel is arranged in the support roller, and the heat exchange channel is used for passing a heat exchange medium.

[0013] In some embodiments of the second aspect of the present application, the metering extrusion film forming device further comprises a transfer roller arranged at a position spaced apart from the discharge port, the transfer roller is rotatable relative to the discharge port, a surface of the transfer roller facing the discharge port is formed as the material receiving surface, and the transfer roller is used for transferring the extruded material powder to a surface of the electrode sheet.

[0014] In some embodiments of the second aspect of the present application, the metering extrusion film forming device further comprises an ultrasonic horn, and the ultrasonic horn is arranged at the extrusion opening.

[0015] The embodiments of the present application have at least the following beneficial effects: by setting the extrusion opening, space is provided for the ultrasonic horn to extend into the extrusion opening, the extrusion opening is in communication with the storage space or the discharge channel, and the powder can be pushed into the discharge channel from the storage space under the ultrasonic vibration extrusion of the ultrasonic horn, while the powder in the storage space can be continuously supplemented into the discharge channel. The powder entering the discharge channel can be vibrated and compacted under the ultrasonic vibration, and extruded from the discharge port, and after the powder is extruded, it reaches the receiving surface and forms a film on the receiving surface. During the extrusion of the powder, the mutual communication of the extrusion opening structure and the discharge channel and the size structure of the extrusion opening and the discharge channel can limit the extrusion amount of the powder, ensure that the powder is extruded in a quantitative manner during the vibration extrusion to form a film, so that the film density can meet the process requirements, and the film quality of the electrode sheet powder in the electrode manufacturing is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The aspects and advantages of the embodiments described and / or appended herein will become apparent and easily understood with reference to the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0017] Figure 1 A structural schematic diagram of an extrusion structure provided by the embodiments of the present application is shown in the figure;

[0018] Figure 2 A partial enlarged view of A in the figure; Figure 1

[0019] Figure 3 A structural schematic diagram of a first example of a metering extrusion film forming device provided by the embodiments of the present application is shown in the figure;

[0020] Figure 4 A structural schematic diagram of a second example of a metering extrusion film forming device provided by the embodiments of the present application is shown in the figure;

[0021] Figure 5 A structural schematic diagram of a third example of a metering extrusion film forming device provided by the embodiments of the present application is shown in the figure.

[0022] Reference signs: 100, extrusion structure; 110, storage space; 111, powder falling groove; 1111, avoiding gap; 120, discharge channel; 121, discharge port; 130, extrusion opening; 200, metering extrusion film forming device; 210, receiving surface; 220, ultrasonic head; 221, ultrasonic transducer; 222, ultrasonic amplitude transformer; 223, fixed support; 230, supporting roller; 231, heat exchange channel; 240, movable support; 300, powder. DETAILED DESCRIPTION

[0023] ​The application will be described below with reference to the drawings, wherein Figures 1 to 5 The embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same reference numerals throughout the several views. The embodiments described below are exemplary only, and are not intended to be limiting of the present application.

[0024] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by terms such as "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. In addition, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.

[0025] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the first aspect, referring to Figures 1 to 2 The present application provides an extrusion structure 100, comprising a storage space 110, a discharge channel 120 and an extrusion opening 130. The storage space 110 is used to store powder 300, the discharge channel 120 is communicated with the storage space 110, and the discharge channel 120 has a discharge port 121 away from the storage space 110. The extrusion opening 130 is arranged in the storage space 110, or arranged at one end of the discharge channel 120 away from the discharge port 121, and the extrusion opening 130 is used for the ultrasonic horn 220 to extend into and extrude and vibrate the powder 300.

[0027] By setting the extrusion structure 100, the material powder 300 can be stored by using the storage space 110, by setting the extrusion opening 130, space can be provided for the ultrasonic horn 220 to extend into the extrusion opening 130, by using the extrusion opening 130 in communication with the storage space 110 or the discharge channel 120, the material powder 300 can be pushed into the discharge channel 120 under the ultrasonic vibration extrusion of the ultrasonic horn 220, at the same time, the material powder in the storage space 110 can be continuously supplemented into the discharge channel 120. The material powder entering the discharge channel 120 can be vibrated and compacted under the action of ultrasonic vibration, and extruded from the discharge port 121, and the material powder 300 is extruded to the receiving surface and forms a film on the receiving surface. During the process of powder extrusion, the extrusion amount of the material powder 300 can be limited by the mutual communication of the extrusion opening 130 and the discharge channel 120 and the size structure of the extrusion opening 130 and the discharge channel 120 itself, ensuring that the material powder 300 is extruded and formed into a film in a quantitative manner during vibration extrusion, so that the film density can meet the process requirements, and the film quality of the electrode sheet material powder in electrode manufacturing is improved.

[0028] Optionally, the length H and width L of the discharge channel 120 can be controlled by using the discharge channel 120, that is, by controlling and adjusting the length H and width L of the discharge channel 120 to measure and control the extrusion amount of the material powder 300. At the same time, by using the ultrasonic vibration extrusion of the ultrasonic horn 220 in the extrusion opening 130, the material powder 300 can be vibrated and compacted and extruded from the discharge port 121, and the material powder 300 is extruded to the receiving surface 210 (such as the surface of the electrode sheet, the surface of the transfer roller, etc.) and forms a film on the receiving surface 210. By adjusting the length H of the discharge channel 120, the resistance of the material powder 300 in the discharge channel 120 can be adjusted, for example, when the length H is increased, the discharge resistance is increased, at this time the film density can be increased, when the length H is reduced, the discharge resistance is reduced, so that the film density can be reduced. By adjusting the width L of the discharge channel 120, the discharge amount per unit length can be changed, for example, when the width L is increased, the discharge amount per unit length can be increased, so that the film density can be increased, when the width L is reduced, the discharge amount can be reduced, so that the film density can be reduced. It can be seen that by separately controlling the length H and width L of the discharge channel 120, the film density of the material powder 300 can be accurately adjusted, so that the film density can meet the process requirements, and the film quality of the electrode sheet material powder 300 in electrode manufacturing is improved. It can be understood that the length H and width L of the discharge channel 120 can be adjusted separately or simultaneously to accurately control the film density.

[0029] It can be understood that the length H and the width L of the discharge channel 120 of the extrusion structure 100 can be fixed for the same extrusion structure 100, and thus the discharge channel 120 with different length H or width L can be obtained by selecting extrusion structures 100 with different specifications or selecting discharge channel 120 accessories with different specifications. Of course, in other examples, the extrusion structure 100 can adjust the width L by adjusting the distance between the two side walls of the discharge channel 120, or adjust the length H by adjusting the distance between the inlet and outlet of the discharge channel 120, which means that the components inside the extrusion structure 100 can be set as movable components, so as to adjust the length H and the width L of the discharge channel 120 by moving the movable components, which is not limited here.

[0030] In some embodiments, the storage space 110 includes a material falling groove 111, the material falling groove 111 is arranged inclinedly relative to the discharge channel 120, and the material falling groove 111 is communicated with the discharge channel 120, and the extrusion opening 130 is arranged at the connection between the material falling groove 111 and the discharge channel 120. By arranging the material falling groove 111 inclinedly, the material powder 300 can freely fall under the action of gravity and smoothly move to the position of the discharge channel 120, so as to realize continuous feeding of the discharge channel 120. By arranging the extrusion opening 130 at the connection between the material falling groove 111 and the discharge channel 120, the ultrasonic horn 220 can vibrate and extrude the material powder 300 at the starting position of the discharge channel 120, and when the material powder 300 is compacted and pushed to the discharge port 121 under the action of vibration, the material powder 300 in the material falling groove 111 can move and timely supplement to the discharge channel 120 under the action of gravity, so as to realize continuous feeding of the discharge channel 120.

[0031] In some embodiments, the discharge channel 120 is arranged vertically, the storage space 110 includes at least two material falling grooves 111, the two material falling grooves 111 are arranged symmetrically about the discharge channel 120, and the extrusion opening 130 is arranged at the connection between the two material falling grooves 111. By arranging the material falling grooves 111 symmetrically, on the one hand, the feeding efficiency of the discharge channel 120 can be improved by feeding on both sides at the same time, and on the other hand, the uniformity of feeding of the two material falling grooves 111 can be ensured, so as to ensure that the discharge channel 120 can discharge smoothly. Of course, in other examples, the material falling grooves 111 can be more than two, such as three, four, etc., and the plurality of material falling grooves 111 can be arranged symmetrically about the discharge channel 120 or can be arranged at equal intervals around the discharge channel 120, which is not limited here.

[0032] As an alternative embodiment, the material falling groove 111 can be arranged in the form of a conical surface, for example, as shown in FIG. 8, the material falling groove 111 is arranged in the form of a conical surface, and the extrusion opening 130 is arranged at the connection between the material falling groove 111 and the discharge channel 120. Figure 2The conical space formed by the rotation of the material dropping groove 111 around the axis of the material outlet channel 120 is the material storage space 110, and the material dropping groove 111 is formed in the space. The powder 300 can be supplied to the material dropping channel in any direction of the conical space.

[0033] In some embodiments, the side wall of the material dropping groove 111 away from the material outlet channel 120 is provided with a relief gap 1111, which is connected to the extrusion opening 130. The relief gap 1111 is used for the ultrasonic horn 220 to extend into the extrusion opening 130. By providing the relief gap 1111, an avoidance space can be formed at the connection between the outer side walls of the two adjacent material dropping grooves 111. The avoidance space can avoid the interference between the outer walls of the two material dropping grooves 111, and can expose the extrusion opening 130 to facilitate the extension of the ultrasonic probe.

[0034] In some embodiments, the material outlet 121 is arranged to extend along the width direction of the pole piece. By arranging the material outlet 121 to extend along the width direction of the pole piece, the material outlet 121 can discharge material while the pole piece moves along its length direction, so that the powder 300 coating film forming process on the surface of the pole piece can be completed at one time, thereby improving the efficiency of the powder 300 coating.

[0035] Of course, in other embodiments, the opening size of the material outlet 121 can be smaller than the width of the pole piece. The pole piece can be coated with powder 300 by multiple coating or by using multiple extrusion structures 100 arranged in parallel to discharge material. The pole piece can also be reciprocally moved along the width direction of the pole piece while the extrusion structure 100 discharges material, so that the pole piece is fully coated with powder 300 along the width direction.

[0036] In a second aspect, referring to Figures 2 to 4 The application also provides a metering extrusion film forming device 200, which comprises a material receiving surface 210 and the extrusion structure 100 provided in the first aspect. The material receiving surface 210 is arranged at the material outlet 121, and the material receiving surface 210 and the material outlet 121 have a gap M therebetween. Since the material receiving surface 210 and the material outlet 121 have a gap M therebetween, the powder 300 can reach the material receiving surface 210 and form a film on the material receiving surface 210 after being extruded from the material outlet 121. At this time, the film thickness of the powder 300 is the gap M. Therefore, by controlling the gap M between the material receiving surface 210 and the material outlet 121, the film thickness can be accurately controlled. As can be seen, by using the length H, the width L and the gap M of the material outlet channel 120, the film density and the film thickness of the powder 300 can be metered and controlled to meet the process requirements. In this way, the powder 300 can be extruded and formed once to meet the production requirements of the pole piece, and there is no need for secondary rolling and thinning, which helps to improve the manufacturing efficiency.

[0037] Exemplarily, referring toFigure 4 The gap M can be achieved by adjusting the relative position between the extrusion structure 100 and the receiving surface 210. For example, by setting the extrusion structure 100 on the movable support 240, by adjusting the height position of the extrusion structure 100 on the movable support 240, the adjustment of the relative position between the extrusion structure 100 and the receiving surface 210 is achieved. For example, the receiving surface 210 can remain stationary in the vertical direction, and the extrusion structure 100 is set above the receiving surface 210. When the extrusion structure 100 is adjusted on the movable support 240, the gap M increases, and when the extrusion structure 100 is adjusted on the movable support 240, the gap M decreases. It can be understood that the gap M can be adjusted according to the process requirements before the extrusion structure 100 is used, and the gap M is no longer adjusted during the use of the extrusion structure 100, so as to ensure that the extrusion structure 100 has a stable gap M during discharging, so that the material powder 300 has a uniform film thickness after extrusion. Of course, in other examples, the position of the receiving surface 210 can be adjusted up and down to adjust the gap M, which is not limited here.

[0038] In some embodiments, the metering extrusion film forming device 200 further comprises an ultrasonic horn 220, which is arranged in the extrusion opening 130. By using the ultrasonic vibration of the ultrasonic horn 220, the material powder 300 can be vibrated and compacted through the extrusion opening 130, and the material powder 300 is pushed out of the discharging channel 120. Optionally, the material powder 300 refers to the active substance, the conductive agent, the solid adhesive and other substances after mixing. These substances are mixed in powder form to form uniform and stable material powder 300. The working frequency of the ultrasonic horn 220 can be 15KHz-20KHz, for example, 15KHz, 16KHz, 18KHz, 20KHz, etc. The energy generated by the ultrasonic vibration can compact the material powder 300, improve the density of the material powder 300, and thus realize the film forming effect of the material powder 300.

[0039] Optionally, referring to Figure 4 and Figure 5 The ultrasonic horn 220 can also be installed by using a fixed support 223, and the ultrasonic transducer 221 and the ultrasonic amplitude rod 222 can be connected in sequence, and the ultrasonic transducer 221 and the ultrasonic amplitude rod 222 are used to drive the ultrasonic horn 220. The fixed support 223 can fix the ultrasonic amplitude rod 222, so as to adjust the gap between the ultrasonic horn 220 and the extrusion structure 100.

[0040] It can be understood that the material receiving surface 210 refers to a surface for receiving the material powder 300, which can be in the form of a plane or a curved surface. The material receiving surface 210 can be the surface of a pole piece, that is, the material powder 300 can be directly extruded from the material outlet channel 120 to the pole piece to complete the coating of the material powder 300. Alternatively, in other examples, the material powder 300 does not directly fall on the surface of the pole piece, but is now formed into a film on the surface of a transfer roller (not shown), and then the film formed by the material powder 300 is transferred to the pole piece by the transfer roller. This is not limited. The two implementation manners of the material receiving surface 210 being the surface of the pole piece or the surface of the transfer roller will be described below.

[0041] In some embodiments, the metering extrusion film forming device 200 further comprises a supporting roller 230 arranged in a spaced manner with the material outlet 121. The supporting roller 230 is rotatable relative to the material outlet 121. The surface of the supporting roller 230 facing the material outlet 121 is used to wind the pole piece, and the surface of the pole piece facing the material outlet 121 is formed as the material receiving surface 210. By arranging the supporting roller 230, the pole piece receiving the material powder 300 can be supported, so as to avoid the size of the gap M from fluctuating due to the shaking of the pole piece when the material powder 300 is coated, and to avoid the problem of uneven film thickness. Therefore, arranging the material receiving surface 210 on the supporting roller 230 can improve the stability and reliability of the extrusion film forming process of the material powder 300, so that the film thickness is more uniform, and the effect of manufacturing the pole piece is improved.

[0042] Optionally, the supporting roller 230 can be made of alloy steel material, so that the supporting roller 230 has sufficient strength and rigidity and can provide good support for the pole piece. The roughness of the surface of the supporting roller 230 can be set to Ra 12.5-6.3. In this way, when the pole piece is wound on the surface of the supporting roller 230, the two can have good friction, so that the supporting roller 230 can provide sufficient tension to the pole piece, so that the surface of the pole piece can be kept flat, and it is ensured that the extrusion film forming material powder 300 can be uniformly coated on the surface of the pole piece.

[0043] In some embodiments, the supporting roller 230 is provided with a temperature changing structure for heating or cooling the supporting roller 230. According to the requirement of the film forming temperature, the temperature of the supporting roller 230 can be selectively changed, for example, the supporting roller 230 is heated or cooled, so as to meet the process requirement of temperature control in the film forming process. For example, for the binder particles mixed in the pole piece material powder 300, the binder particles will generally denature at high temperature and thus have viscosity. Therefore, by heating the supporting roller 230, the pole piece material powder 300 can be made to have viscosity during the extrusion to the material receiving surface 210 to form a film, so as to meet the process requirement. Alternatively, in other examples, if it is required to avoid the viscosity of the binder particles during the extrusion film forming process of the pole piece material powder 300, the supporting roller 230 is cooled, so as to avoid the pole piece material from being too early.

[0044] In some embodiments, the support roller 230 is provided with a heat exchange channel 231 for passing a heat exchange medium. By providing the heat exchange channel 231, different heat exchange media can be selectively passed to achieve the heating or cooling effect of the support roller 230. For example, by passing a hot medium (such as heat conducting oil) in the heat exchange channel 231, the temperature of the support roller 230 can be increased, and by passing a cold medium (such as cooling liquid) in the heat exchange channel 231, the temperature of the support roller 230 can be decreased. Alternatively, the heat exchange channel 231 can be provided in the axial direction of the support roller 230 and extend through both end faces of the support roller 230. Of course, in other embodiments, the support roller 230 can be heated without using a heat exchange medium, but by using an electric heating tube or an electromagnetic coil.

[0045] In some embodiments, the metering extrusion film forming device 200 further comprises a transfer roller which is provided in the spaced relationship with the discharge port 121 and is rotatable relative to the discharge port 121, and a surface of the transfer roller facing the discharge port 121 is formed as the receiving surface 210, and the transfer roller is used to transfer the extruded material powder 300 to the surface of the pole piece. By using the transfer function of the transfer roller, when the material powder 300 is extruded from the discharge channel 120, the material powder 300 can first be formed into a film on the surface of the transfer roller, and then when the transfer roller is rotated to contact the pole piece, the material powder 300 formed into a film on the surface of the transfer roller can be transferred to the surface of the pole piece, thereby achieving the effect of coating the material powder 300 on the surface of the pole piece. By providing the transfer roller, the fluctuation of the size of the gap M caused by the shaking of the pole piece when the material powder 300 is directly coated on the pole piece can be avoided, and the problem of uneven film thickness can be avoided. Therefore, by providing the receiving surface 210 on the transfer roller, the stability and reliability of the extrusion film forming process of the material powder 300 can be improved, the film thickness is more uniform, and the effect of manufacturing the pole piece is improved.

[0046] Of course, as an alternative embodiment, the receiving surface 210 can also be directly provided on the pole piece, and the pole piece is provided corresponding to the discharge port 121, and the pole piece can be provided with tensioning rollers at both ends for tensioning, so that the surface of the pole piece has a certain tension, thereby reducing the amplitude of the shaking of the pole piece during the extrusion of the material powder 300 of the pole piece in the discharge channel 120, and the extrusion film forming process of the material powder 300 of the pole piece is more stable. Alternatively, as another alternative embodiment, the receiving surface 210 can be directly provided on the pole piece, and the pole piece is supported by a transmission belt, a transmission block or the like, and in this case, the receiving surface 210 can be a flat surface. In this way, the stability requirement of the pole piece can also be met, and the effect of moving the pole piece during the extrusion of the material powder 300 of the pole piece can be achieved, which is not limited in the present example.

[0047] In the description of the application, if the description of the terms "one embodiment", "some examples", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" appears, it means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The embodiments of the application described above in conjunction with the drawings are not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art in the technical field without departing from the purpose of the application.

[0049] In the description of the application, if the patent name appears as "and", it means "and" relationship, not "or" relationship. For example, the patent name is "one A, B", which means that the content claimed by the application is: the technical solution of the subject name A and the technical solution of the subject name B.

Claims

1. An extruded structure characterized by: The metering extrusion film forming device comprises: a storage space for storing powder; an outlet channel connected to the storage space, the outlet channel having an outlet end away from the storage space; an extrusion opening provided in the storage space or in an end of the outlet channel away from the outlet, the extrusion opening being used for the ultrasonic horn to extend into and extrude the powder.

2. The extruded structure of claim 1, wherein: The storage space comprises a chute, the chute being provided obliquely relative to the outlet channel and being connected to the outlet channel, and the extrusion opening being provided at a connection between the chute and the outlet channel.

3. The extruded structure of claim 2, wherein: The outlet channel is vertically provided, the storage space comprises at least two chutes, the two chutes being provided symmetrically relative to the outlet channel, and the extrusion opening being provided at a connection between the two chutes.

4. The extruded structure of claim 3, wherein: A side wall of the chute away from the outlet channel is provided with a relief gap, the relief gap being connected to the extrusion opening, and the relief gap being used for the ultrasonic horn to extend into the extrusion opening.

5. A metering extrusion film forming apparatus characterized by: The metering extrusion film forming device comprises:

6. The metering extrusion film forming apparatus of claim 5, wherein: The metering extrusion film forming device further comprises a support roller provided at a position spaced from the outlet, the support roller being rotatable relative to the outlet, a surface of the support roller facing the outlet being used for winding the pole piece, and a surface of the pole piece facing the outlet being formed as the receiving surface.

7. The metering extrusion film forming apparatus of claim 6, wherein: The support roller is provided with a temperature changing structure, the temperature changing structure being used for heating or cooling the support roller.

8. The metering extrusion film forming apparatus of claim 7, wherein: The support roller is provided with a heat exchange channel, the heat exchange channel being used for passing a heat exchange medium.

9. The metering extrusion film forming apparatus of claim 5, wherein: The metering extrusion film forming device further comprises a transfer roller provided at a position spaced from the outlet, the transfer roller being rotatable relative to the outlet, a surface of the transfer roller facing the outlet being formed as the receiving surface, and the transfer roller being used for transferring the extruded powder to the surface of the pole piece.

10. The metering extrusion film forming apparatus of claim 5, wherein: The metering extrusion film forming device further comprises an ultrasonic horn provided in the extrusion opening.

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