Dry-method electrode powder extrusion traction film forming device

Abstract

The utility model belongs to the technical field of battery production and processing, and discloses a dry method electrode powder extrusion traction film-forming device which comprises an extruder body and a film-forming device, the film-forming device comprises a uniform pressure cavity and a film-forming mechanism, the film-forming device is arranged at a first outlet of the extruder body, the uniform pressure cavity is formed in the film-forming device, and the film-forming mechanism is arranged at a second outlet of the extruder body. A powder inlet and a feeding outlet are formed in the two ends of the uniform pressure cavity correspondingly, and the height of the uniform pressure cavity is gradually reduced in the direction from the powder inlet to the feeding outlet. According to the dry-method electrode powder extrusion traction film forming device, the gradually-changed uniform pressure cavity can reduce the resistance of the powder when the powder is extruded to flow in the uniform pressure cavity, so that a powder body which is flat in texture and uniform in surface density can be obtained; the film forming mechanism arranged at the feeding outlet can extrude and pull the powder to form a film, secondary treatment of the powder is achieved, the film forming efficiency of the powder can be improved, and the film forming quality and the film forming surface density of the powder can also be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery production and processing, in particular to a dry-process electrode powder extrusion traction film forming device. BACKGROUND

[0002] The mainstream production method of battery electrodes includes a wet process and a dry process, but the wet process has problems of energy waste, high cost and environmental pollution, while the dry process has advantages of reducing cost, inhibiting delamination, having no limitation on electrode thickness and being compatible with sulfide solid electrolyte. Powder extrusion film forming is the core process of the dry process, and to ensure the electrochemical performance of the electrode sheet, the physical indicators of the electrode powder must first meet the process requirements.

[0003] A common powder extrusion film forming process is to place a hopper above a double pair of rollers, directly stack the feed, and press the powder into a film by rotating the rollers. However, due to the difficulty in accurately controlling the stacking height of the powder, the time and distance of the stacked powder contacting the hot roller surface are different, which can cause uneven surface density and poor film consistency of the powder. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a dry-process electrode powder extrusion traction film forming device to solve the problems of uneven surface density and poor film consistency during powder extrusion in the prior art.

[0005] To achieve the above-mentioned purpose, the application provides a dry-process electrode powder extrusion traction film forming device, which comprises:

[0006] An extruder body having a first inlet and a first outlet, the extruder body being used to extrude powder from the first inlet to the first outlet;

[0007] A film forming device comprising a uniform pressure cavity and a film forming mechanism, the film forming device being arranged at the first outlet, the inside of the film forming device being provided with a uniform pressure cavity, both ends of the uniform pressure cavity being provided with a powder inlet and a feed outlet, the powder inlet being in communication with the first outlet, the height of the uniform pressure cavity gradually decreasing in the direction from the powder inlet to the feed outlet, and the powder being extruded into a powder body after passing through the uniform pressure cavity;

[0008] The film forming mechanism is arranged at the feed outlet, and the film forming mechanism is a roller pressing mechanism used to press the powder body, and the powder body is formed into a film after being pressed.

[0009] Optionally, the film forming device has a cavity, the cavity includes an upper cavity and a lower cavity, the upper cavity and the lower cavity are detachably connected, and when the upper cavity and the lower cavity are connected, the uniform pressure cavity is formed between the upper cavity and the lower cavity.

[0010] Optionally, along the direction from the powder inlet to the supply outlet, the width of the uniform pressure cavity gradually decreases, or the width of the uniform pressure cavity gradually increases.

[0011] Optionally, along the direction from the powder inlet to the supply outlet, the uniform pressure cavity is divided into a first section and a second section, the central axis of the first section and the central axis of the second section coincide, or the central axis of the first section and the central axis of the second section are perpendicular, or the central axis of the first section and the central axis of the second section are arranged at an obtuse angle.

[0012] Optionally, the roller pressing mechanism comprises:

[0013] two rollers rotatably arranged on opposite sides of the supply outlet; and

[0014] a first rotary driving mechanism for driving the rollers to rotate.

[0015] Optionally, at least one of the rollers is arranged on a sliding seat, and the sliding seat is provided with an adjusting bolt for adjusting the distance between the two rollers.

[0016] Optionally, the dry electrode powder extrusion traction film forming device further comprises a plurality of temperature control structures, and the plurality of temperature control structures are arranged in the film forming device around the uniform pressure cavity.

[0017] Optionally, the extruder body comprises:

[0018] a barrel body formed with an accommodating cavity, the first inlet is arranged on the side surface of one end of the accommodating cavity, and the first outlet is arranged on the end surface of the other end of the accommodating cavity;

[0019] a hopper arranged at the first inlet;

[0020] a screw rotatably arranged in the accommodating cavity; and

[0021] a second rotary driving mechanism arranged outside the barrel body and connected to the screw.

[0022] Optionally, along the direction from the first inlet to the first outlet, the screw comprises a powder feeding section, a mixing and conveying section, a shearing and kneading section, an exhaust section and a homogenizing extrusion section in sequence.

[0023] Optionally, the screw is provided with three.

[0024] The dry electrode powder extrusion traction film forming device provided by the application has the beneficial effects that, compared with the prior art, the dry electrode powder extrusion traction film forming device provided by the application comprises an extruder body and a film forming device, the film forming device comprises a uniform pressure cavity and a film forming mechanism, the film forming device is arranged at the first outlet of the extruder body, the uniform pressure cavity is located inside the film forming mechanism, the uniform pressure cavity is provided with a powder inlet and a feeding outlet at two ends thereof along the direction from the powder inlet to the feeding outlet, the height of the uniform pressure cavity gradually decreases, the resistance of the powder when being extruded and flowing in the uniform pressure cavity can be reduced, so that the powder body with flat texture and uniform surface density can be obtained, the roller pressing mechanism arranged at the feeding outlet can extrude and traction the powder body, the secondary treatment of the powder body is realized, the film forming efficiency of the powder body is improved, and the film forming quality and the film forming surface density of the powder body are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0026] Figure 1 A front view structural schematic diagram of the dry electrode powder extrusion traction film forming device provided by the embodiments of the application is provided.

[0027] Figure 2 A front view structural schematic diagram of the first embodiment of the film forming device of the dry electrode powder extrusion traction film forming device of the application is provided.

[0028] Figure 3 A front view structural schematic diagram of the second embodiment of the film forming device of the dry electrode powder extrusion traction film forming device of the application is provided.

[0029] Figure 4 A front view structural schematic diagram of the third embodiment of the film forming device of the dry electrode powder extrusion traction film forming device of the application is provided.

[0030] Figure 5 A front view structural schematic diagram of the screw of the dry electrode powder extrusion traction film forming device provided by the embodiments of the application is provided.

[0031] Explanation of reference signs:

[0032] 1. Extruder body; 110. Barrel; 111. Receiving cavity; 112. First inlet; 113. First outlet; 120. Hopper; 130. Screw; 131. Powder feeding section; 132. Mixing and conveying section; 133. Shearing and kneading section; 134. Exhaust section; 135. Homogenizing and extruding section; 140. Second rotary drive mechanism;

[0033] 2. Film forming device; 210. Uniform pressure chamber; 220. Powder inlet; 230. Feed outlet; 240. Upper chamber; 250. Lower chamber;

[0034] 3. Film-forming mechanism; 310. Roller; 320. Adjusting bolt;

[0035] 4. Temperature control structure;

[0036] 5. Powder;

[0037] 6. Powder. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] The embodiments of this application provide a dry electrode powder extrusion traction film forming device, please refer to the following: Figures 1 to 5 The dry electrode powder extrusion traction film forming device includes an extruder body 1 and a film forming device 2;

[0045] The extruder body 1 has a first inlet 112 and a first outlet 113. The extruder body 1 is used to extrude powder 5 from the first inlet 112 to the first outlet 113.

[0046] The film-forming apparatus 2 includes a pressure equalization chamber 210 and a film-forming mechanism 3;

[0047] The film forming device 2 is arranged at the first outlet 113, the uniform pressure cavity 210 is arranged in the film forming device 2, the two ends of the uniform pressure cavity 210 are respectively provided with the powder inlet 220 and the feeding outlet 230, the powder inlet 220 is communicated with the first outlet 113, and the height of the uniform pressure cavity 210 gradually decreases along the direction from the powder inlet 220 to the feeding outlet 230; the powder 5 is extruded into the powder body 6 with uniform surface density after passing through the uniform pressure cavity 210.

[0048] The film forming mechanism 3 is arranged at the feeding outlet 230, and the film forming mechanism 3 is a rolling mechanism for rolling the powder body 6.

[0049] In the embodiment, the dry electrode powder extrusion traction film forming device includes an extruder body 1 and a film forming device. The film forming device includes a film forming device 2 arranged at the first outlet 113 of the extruder body 1. The film forming device 2 includes a uniform pressure cavity 210 arranged in the film forming device 2. The two ends of the uniform pressure cavity 210 are respectively provided with a powder inlet 220 and a feeding outlet 230. The height of the uniform pressure cavity 210 gradually decreases along the direction from the powder inlet 220 to the feeding outlet 230. The resistance of the powder 5 in the uniform pressure cavity 210 can be reduced when the powder 5 is extruded and flows, so that the powder body 6 with flat texture and uniform surface density can be obtained. The film forming device further includes a film forming mechanism 3. The film forming mechanism 3 has a rolling function. The film forming mechanism 3 is arranged at the feeding outlet 230. The film forming mechanism 3 can extrude and pull the powder body 6, realize secondary processing of the powder body 6, improve the film forming efficiency of the powder 5, and improve the film forming quality and surface density of the powder body 6.

[0050] In one embodiment, referring to Figures 2 to 4 , the film forming device 2 includes an upper cavity 240 and a lower cavity 250. The upper cavity 240 and the lower cavity 250 are detachably connected, so that the uniform pressure cavity 210 can be conveniently cleaned and maintained. When the upper cavity 240 and the lower cavity 250 are connected, the uniform pressure cavity 210 is formed between the upper cavity 240 and the lower cavity 250.

[0051] Further, the upper cavity 240 and the lower cavity 250 are sealingly arranged, so as to avoid leakage of the powder 5.

[0052] In one embodiment, the width of the uniform pressure cavity 210 gradually decreases along the direction from the powder inlet 220 to the feeding outlet 230. The powder 5 is gradually contracted inward to form the powder body 6, and the surface density of the powder body 6 is large. Alternatively, the width of the uniform pressure cavity 210 gradually increases, the width of the powder body 6 is large, and the film forming efficiency is high.

[0053] Specifically, in order to make the film forming effect of the powder body 6 uniform and avoid cavities or tearing, the difference between the width of the powder inlet 220 and the width of the feeding outlet 230 should not be too large. The size difference between the two should not exceed ±20%.

[0054] Further, the inner wall surface of the uniform pressure cavity 210 is smoothly transitioned.

[0055] Specifically, the specific structure of the uniform pressure cavity 210 is selected according to actual needs, which is not limited herein.

[0056] In the first embodiment of the film forming device 2, referring to Figure 2 , along the direction from the powder inlet 220 to the supply outlet 230, the uniform pressure cavity 210 is divided into a first section and a second section, the central axis of the first section and the central axis of the second section coincide,

[0057] In the second embodiment of the film forming device 2, referring to Figure 3 , the central axis of the first section and the central axis of the second section are perpendicular,

[0058] In the third embodiment of the film forming device 2, referring to Figure 4 , the central axis of the first section and the central axis of the second section are set at an obtuse angle.

[0059] It can be understood that the specific structure of the uniform pressure cavity 210 inside the film forming device 2 is selected according to actual needs, which is not limited herein.

[0060] In an embodiment, referring to Figure 2 , the film forming mechanism 3 includes two rollers 310 and a first rotary driving mechanism, the two rollers 310 are rotatably arranged on opposite sides of the supply outlet 230, and the first rotary driving mechanism is used to drive the rollers 310 to rotate, so as to achieve the effect of pulling and pressing the powder body 6.

[0061] In an embodiment, at least one roller 310 is arranged on a sliding seat, and an adjusting bolt 320 is arranged on the sliding seat, the adjusting bolt 320 is used to adjust the distance between the two rollers 310, so as to obtain a powder body 6 with a preset thickness according to actual needs.

[0062] In an embodiment, referring to Figure 2 , the dry electrode powder extrusion and pulling film forming device further includes a plurality of temperature control structures 4, the plurality of temperature control structures 4 are arranged in the film forming device 2 around the uniform pressure cavity 210; the temperature control structure 4 can heat or cool the upper cavity 240 and the lower cavity 250, so as to control the temperature of the powder 5 and the forming quality.

[0063] Alternatively, the temperature control structure 4 is an electric heating wire arranged in the upper cavity 240 and the lower cavity 250, so that the upper cavity 240 and the lower cavity 250 can be heated. Or, the temperature control structure 4 is a flow channel arranged in the upper cavity 240 and the lower cavity 250, by introducing cooling medium or heating medium into the flow channel, so that the powder 5 in the uniform pressure cavity 210 can be heated or cooled.

[0064] In one embodiment, referring to Figure 1 , the extruder body 1 comprises a barrel 110, a hopper 120, a screw 130 and a second rotary driving mechanism 140, the barrel 110 is formed with a containing cavity 111, a first inlet 112 is arranged on the side surface of one end of the containing cavity 111, a first outlet 113 is arranged on the end surface of the other end of the containing cavity 111, the hopper 120 is arranged at the first inlet 112, the screw 130 is rotatably arranged in the containing cavity 111, and the second rotary driving mechanism 140 is arranged outside the barrel 110 and connected to the screw 130.

[0065] Specifically, the powder 5 enters the barrel 110 from the hopper 120, and the screw 130 in the barrel 110 sufficiently stirs and fibrillates the powder 5 and then delivers it to the film forming device 2.

[0066] Exemplarily, the first rotary driving mechanism and the second rotary driving mechanism 140 are both rotary motors.

[0067] In one embodiment, referring to Figure 5 , along the direction from the first inlet 112 to the first outlet 113, the screw 130 comprises a powder feeding section 131, a mixing and conveying section 132, a shearing and kneading section 133, an exhaust section 134 and a homogenizing and extruding section 135 in sequence.

[0068] Specifically, the screw 130 is formed by connecting mixing elements, shearing elements and / or kneading elements to the rod, different combinations of the elements have different functions, and the elements can be arranged and combined flexibly according to actual needs, so as to meet different process formulations, which are not limited herein.

[0069] In one embodiment, referring to Figure 5 , the screw 130 is provided with three. In other embodiments, it can also be a single screw 130, a double screw 130 or other number of screws 130, which can be selected according to the mixing and shearing fibrillation function strength required.

[0070] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0071] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A dry electrode powder extrusion draw film forming apparatus characterized by, The application relates to a dry-method electrode powder extruding traction film forming device. The device comprises an extruder body with a first inlet and a first outlet, which is used for extruding powder from the first inlet to the first outlet; a film forming device provided at the first outlet, which is internally provided with a pressure equalizing cavity, two ends of the pressure equalizing cavity are respectively provided with a powder inlet and a feeding outlet, the powder inlet is communicated with the first outlet, the height of the pressure equalizing cavity gradually decreases along the direction from the powder inlet to the feeding outlet, and the powder is extruded into a powder body after passing through the pressure equalizing cavity. The film forming device is provided at the feeding outlet, and the film forming device is a roller pressing mechanism used for roller pressing the powder body. The film forming device has a cavity, which comprises an upper cavity and a lower cavity, the upper cavity and the lower cavity are detachably connected, and when the upper cavity and the lower cavity are connected, the upper cavity and the lower cavity form the pressure equalizing cavity.

2. The dry electrode powder extrusion draw film deposition apparatus of claim 1, wherein, Along the direction from the powder inlet to the feeding outlet, the width of the pressure equalizing cavity gradually decreases, or the width of the pressure equalizing cavity gradually increases.

3. The dry electrode powder extrusion draw film deposition apparatus of claim 1, wherein, Along the direction from the powder inlet to the feeding outlet, the pressure equalizing cavity is divided into a first section and a second section, the central axis of the first section and the central axis of the second section coincide, or the central axis of the first section and the central axis of the second section are perpendicular, or the central axis of the first section and the central axis of the second section are arranged at an obtuse angle.

4. The dry electrode powder extrusion draw film deposition apparatus of claim 1, wherein, The film forming device comprises:

5. The dry electrode powder extrusion draw film deposition apparatus of any of claims 1-4, wherein, two rollers rotatably arranged on opposite sides of the feeding outlet; and a first rotary driving mechanism used for driving the rollers to rotate. At least one of the rollers is arranged on a sliding seat, the sliding seat is provided with an adjusting bolt, and the adjusting bolt is used for adjusting the distance between the two rollers.

6. The dry electrode powder extrusion draw film deposition apparatus of claim 5, wherein, The dry-method electrode powder extruding traction film forming device further comprises a plurality of temperature control structures, and the plurality of temperature control structures are arranged in the film forming device and surround the pressure equalizing cavity.

7. The dry electrode powder extrusion draw film deposition apparatus of any of claims 1-4, wherein, The extruder body comprises:

8. The dry electrode powder extrusion draw film deposition apparatus of any of claims 1-4, wherein, a barrel body formed with an accommodating cavity, the first inlet is arranged on the side surface of one end of the accommodating cavity, and the first outlet is arranged on the end surface of the other end of the accommodating cavity; a hopper arranged at the first inlet; a screw rotatably arranged in the accommodating cavity; and a second rotary driving mechanism arranged outside the barrel body and connected to the screw. Along the direction from the first inlet to the first outlet, the screw comprises a powder feeding section, a mixing and conveying section, a shearing and kneading section, an exhaust section and a homogenizing and extruding section in sequence.

9. The dry electrode powder extrusion draw film deposition apparatus of claim 8, wherein, The screw is provided with three.

10. The dry electrode powder extrusion draw film deposition apparatus of claim 8, wherein, ​

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