Vacuum hot flat pressing machine

Abstract

The invention provides a vacuum hot flat pressing machine, and relates to the technical field of all-solid-state battery production, the vacuum hot flat pressing machine comprises a vacuum sealing box, the vacuum sealing box is provided with a sealing door, a hot pressing assembly is arranged in the vacuum sealing box, the hot pressing assembly comprises a pole piece bearing table and a pressing plate, and the pressing plate is arranged above the pole piece bearing table through a driving part; the pressure plate is arranged on the pole piece bearing table and used for pressurizing a composite film placed on the pole piece bearing table, air holes are formed in the surfaces of the pole piece bearing table and the pressure plate, heating elements and high-temperature-resistant buffer layers are arranged in the pole piece bearing table and the pressure plate, and the control system comprises a processing module, a temperature control module, a pressure control module and a vacuum degree control module. The processing module is in signal connection with the temperature control module, the pressure control module and the vacuum degree control module. According to the invention, gas can be completely discharged, cavities, bubbles or delamination are prevented from being formed after the composite film is hot-pressed, and the flatness is relatively good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of all-solid-state battery production, and particularly relates to a vacuum hot flat pressing machine. BACKGROUND

[0002] In the production process of all-solid-state battery products, a hot pressing process is often used to composite multiple layers of materials. When the traditional hot pressing equipment is pressurized and heated, the air between the composite material layers and the gas adsorbed in the material cannot be completely discharged, and air holes, air bubbles or delamination are easily formed in the composite layer. These defects can seriously affect the mechanical properties, electrical conductivity and service life of the product. SUMMARY

[0003] In view of the problems in the prior art, the present application provides a vacuum hot flat pressing machine which can completely discharge gas and avoid the formation of air holes, air bubbles or delamination after hot pressing of the composite film, and has good flatness.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A vacuum hot flat pressing machine comprises:

[0006] A vacuum sealed box is provided with a sealed door;

[0007] A hot pressing assembly is arranged in the vacuum sealed box, the hot pressing assembly comprises a pole piece bearing table and a pressing plate, the pressing plate is arranged above the pole piece bearing table through a driving member, and is used for pressurizing the composite film placed on the pole piece bearing table, the surfaces of the pole piece bearing table and the pressing plate are both provided with air permeable holes, and the interiors of the pole piece bearing table and the pressing plate are provided with a heating element and a high-temperature-resistant buffer layer;

[0008] A control system comprises a processing module, a temperature control module, a pressure control module and a vacuum degree control module, and the processing module is signal connected with the temperature control module, the pressure control module and the vacuum degree control module respectively;

[0009] The temperature control module is used for collecting the real-time temperature of the hot pressing assembly and controlling the temperature within a preset range, the pressure control module is used for collecting the real-time pressure of the composite film by the driving member and adjusting the output pressure, and the vacuum degree control module is used for collecting the real-time vacuum degree in the vacuum sealed box and adjusting the vacuumizing rate.

[0010] The vacuum hot flat pressing machine as described above further comprises at least one group of temperature sensors and heating driving members, the temperature sensors are used for collecting the real-time temperature of the hot pressing assembly, and the heating driving members are used for adjusting the heating power of the heating element;

[0011] The processing module controls the heating driving element to adjust the heating power of the heating element according to the feedback signal of the temperature sensor, so that the temperature of the hot pressing assembly is within a preset range, and the temperature control accuracy is ≤±1℃.

[0012] The vacuum hot flat pressing machine as described above, further, the hot pressing assembly is divided into several temperature control zones, each temperature control zone is configured with a group of temperature sensors and heating driving elements, and the processing module can independently adjust the temperature of each temperature control zone.

[0013] The vacuum hot flat pressing machine as described above, further, the pressure control module comprises a pressure sensor and a pressure driving element, the pressure sensor is used to collect the real-time pressure of the driving element on the composite film, and the pressure driving element is used to adjust the output pressure of the driving element.

[0014] The processing module controls the pressure driving element to adjust the output pressure of the driving element according to the feedback signal of the pressure sensor, so that the output pressure is within a preset range.

[0015] The vacuum hot flat pressing machine as described above, further, the pressure control module can realize dynamic pressure adjustment, the processing module is preset with a pressure-time curve, and the driving element adjusts the output pressure according to the time sequence change according to the pressure-time curve.

[0016] The vacuum hot flat pressing machine as described above, further, the vacuum degree control module comprises a vacuum degree sensor and a vacuum adjusting element, the vacuum degree sensor is used to collect the real-time vacuum degree in the vacuum sealed box, and the vacuum adjusting element is used to adjust the vacuumizing rate in the vacuum sealed box.

[0017] The processing module controls the vacuum adjusting element to adjust the vacuumizing rate in the vacuum sealed box according to the feedback signal of the vacuum degree sensor, so that the vacuum degree is within a preset range.

[0018] The vacuum hot flat pressing machine as described above, further, the processing module is preset with a vacuum degree rate curve, and the vacuum adjusting element adjusts the rate according to the phase according to the vacuum degree rate curve.

[0019] The vacuum hot flat pressing machine as described above, further, the air permeable hole has a pore size range of 0.01-3mm.

[0020] The vacuum hot flat pressing machine as described above, further, the heating element is an electric heating pipe or an electromagnetic coil.

[0021] The vacuum hot flat pressing machine as described above, further, the driving element is a hydraulic cylinder or a servo motor.

[0022] Compared with the prior art, the advantages of this invention are as follows:

[0023] This invention overcomes the shortcomings of existing composite film hot pressing equipment, such as incomplete gas removal, poor flatness, and insufficient coordination between vacuum and hot pressing, by using overall vacuuming of the vacuum sealing box and local negative pressure degassing of the electrode support platform. This ensures that the composite film is free of voids, bubbles, or delamination after hot pressing and has good flatness. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the vacuum hot flat press in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the hot-pressing assembly in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the pressure plate structure in an embodiment of the present invention;

[0028] Figure 4 This is a flowchart illustrating the usage of the vacuum hot flat press in this embodiment of the invention;

[0029] In the diagram: 1. Vacuum sealing box; 2. Electrode support platform; 3. Pressure plate; 4. Vent hole; 5. High temperature resistant buffer layer; 6. Sealing door; 7. Vacuum gauge; 8. Temperature controller; 9. Hydraulic cylinder; 10. Electric heating tube. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] Example:

[0032] It should be noted that the terms "first", "second", and the like in the description of the application and the claims and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof in the embodiments of the application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0034] In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited. In addition, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0036] The present application provides a technical solution: a vacuum heat press, seeFigures 1 to 3 It includes a vacuum sealed box 1, the surface of which is provided with an openable sealed door 6, which is opened or closed by pneumatic, manual or other means. A hot pressing assembly is arranged in the vacuum sealed box 1, which includes a pole piece bearing table 2 that can provide bearing for a composite film, and a pressing plate 3 above the pole piece bearing table 2, which can pressurize the composite film placed on the pole piece bearing table 2 by driving members. The pole piece bearing table 2 and the pressing plate 3 are both provided with air permeable holes 4, and the hole diameter of the air permeable holes 4 ranges from 0.01 to 3 mm. Local suction and heating can be realized according to requirements, avoiding the situation that gas cannot be discharged due to local sealing during heating, and some small holes can blow out positive pressure to prevent the composite film from sticking to its surface. The pole piece bearing table 2 and the pressing plate 3 are of the same rectangular structure, and both are provided with a high-temperature-resistant buffer layer 5 and a heating element inside. In addition, the heating element can include but is not limited to an electric heating tube, an electromagnetic coil, etc. The heating element of the present application adopts an electric heating tube 10.

[0037] The control system includes a processing module, a temperature control module, a pressure control module and a vacuum degree control module.

[0038] The temperature control module includes at least one set of temperature sensors for collecting the real-time temperature of the hot pressing component, and a heating driving member for adjusting the heating power of the heating element. The processing module adjusts the heating power through the heating driving member according to the feedback signal of the temperature sensor, so that the temperature of the hot pressing component is stabilized at the set value, and the temperature control precision is ≤±1℃. Each temperature control area is configured with independent temperature sensors and heating driving members, and the temperature controller 8 can independently adjust the temperature of each temperature control area. In addition, the heating driving member can include but is not limited to a thyristor regulator, a relay, etc.

[0039] The pressure control module includes a pressure sensor for collecting the real-time pressure of the driving member on the composite film, and a pressure driving member for adjusting the output pressure of the driving member. The processing module adjusts the pressure to the set range through the pressure driving member according to the feedback signal of the pressure sensor. At the same time, dynamic pressure adjustment is also supported, and the processing module can preset a pressure-time curve to make the pressure change according to the curve time sequence through the pressure driving assembly. For example, the pressure can be stepped up, linearly increased or kept constant. In addition, the pressure driving member can include but is not limited to a pressure regulating valve, a hydraulic motor, etc.

[0040] The vacuum degree control module comprises a vacuum degree sensor for collecting real-time vacuum degree in the vacuum box, and a vacuum adjusting component for adjusting the vacuum speed. According to the feedback signal of the vacuum degree sensor, the vacuum degree is controlled in a set range by the vacuum adjusting component, and the vacuum degree information can be observed in real time on the vacuum gauge 7. At the same time, the vacuum speed can also be customized according to the properties of the composite material. For example, the initial vacuum speed is fast, the middle vacuum speed is slow, and the later vacuum speed is fast, so as to achieve better fitting effect and eliminate the gap between the material layers. In addition, the vacuum adjusting component can include but is not limited to a vacuum valve, a vacuum pump frequency converter and the like.

[0041] The driving member can be a hydraulic cylinder or a servo motor, both of which can provide uniform and stable linear pressure. The hydraulic cylinder pushes the actuator by the pressure of hydraulic oil to generate axial thrust, thereby transmitting force to the hot pressing assembly to realize pressure output. The rotary motion of the servo motor is accurately converted into linear motion through the ball screw pair, and the torque of the motor is used to generate pressure. The ball screw itself has good self-locking property (especially with pre-tightening) and can well maintain pressure. The driving member of the present application adopts a hydraulic cylinder 9.

[0042] The use mode of the vacuum flattening machine is as follows: Figure 4 Open the sealing door, place the film to be hot-pressed on the pole piece bearing table plane, close the sealing door and lock it, start the vacuum adjusting component, and set the time to draw the vacuum sealed box to the first set vacuum degree. The composite film is flatly adsorbed on the pole piece bearing table plane under the action of negative pressure. The heating driving member can be started first, heated to the preset temperature and kept constant, the pressure driving member drives the pressing, the pressing plate contacts the composite film and continues to press to the first preset pressure, keeps for a period of time, continues to draw vacuum to reach the second set vacuum degree, and then applies pressure to the second predetermined pressure and keeps for a set time. After hot pressing is completed, the system is restored, and gas is blown out of the hot pressing surface to prevent adhesion. After the reset is completed, the sealing door is opened, and the composite film is taken out.

[0043] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" 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 present application. In the present specification, 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 suitable manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0044] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the essence of the present application should be covered within the protection scope of the present application.

Claims

1. A vacuum hot platen press, characterized in that The application relates to a vacuum sealing box, a hot-pressing assembly arranged in the vacuum sealing box, and a control system. The vacuum sealing box is provided with a sealing door. The hot-pressing assembly comprises a pole piece bearing table and a pressing plate, the pressing plate is arranged above the pole piece bearing table through a driving member, is used for pressing a composite film placed on the pole piece bearing table, the surfaces of the pole piece bearing table and the pressing plate are provided with air permeation holes, and the interiors of the pole piece bearing table and the pressing plate are provided with a heating element and a high-temperature-resistant buffer layer. The control system comprises a processing module, a temperature control module, a pressure control module and a vacuum degree control module, the processing module is signal-connected with the temperature control module, the pressure control module and the vacuum degree control module respectively. The temperature control module is used for collecting real-time temperature of the hot-pressing assembly and controlling the temperature in a preset range, the pressure control module is used for collecting real-time pressure of the driving member on the composite film and adjusting output pressure, and the vacuum degree control module is used for collecting real-time vacuum degree in the vacuum sealing box and adjusting a vacuumizing speed.

2. The vacuum heat laminator according to claim 1, characterized in that The temperature control module comprises at least one group of temperature sensors and a heating driving member, the temperature sensors are used for collecting real-time temperature of the hot-pressing assembly, and the heating driving member is used for adjusting heating power of the heating element. The processing module controls the heating driving member to adjust the heating power of the heating element according to feedback signals of the temperature sensors, so that the temperature of the hot-pressing assembly is in a preset range, and the temperature control precision is less than or equal to plus or minus 1 DEG C.

3. The vacuum heat laminator according to claim 2, characterized in that The hot-pressing assembly is divided into a plurality of temperature control zones, each temperature control zone is provided with a group of temperature sensors and heating driving members, and the processing module can independently adjust the temperature of each temperature control zone.

4. The vacuum heat platener of claim 1, wherein The pressure control module comprises a pressure sensor and a pressure driving member, the pressure sensor is used for collecting real-time pressure of the driving member on the composite film, and the pressure driving member is used for adjusting output pressure of the driving member. The processing module controls the pressure driving member to adjust the output pressure of the driving member according to feedback signals of the pressure sensor, so that the output pressure is in a preset range.

5. The vacuum heat platener according to claim 4, wherein, The pressure control module can realize dynamic pressure adjustment, the processing module is provided with a pressure-time curve, and the driving member is controlled to adjust the output pressure according to the pressure-time curve.

6. The vacuum heat platener of claim 1, wherein The vacuum degree control module comprises a vacuum degree sensor and a vacuum adjusting member, the vacuum degree sensor is used for collecting real-time vacuum degree in the vacuum sealing box, and the vacuum adjusting member is used for adjusting a vacuumizing speed in the vacuum sealing box. The processing module controls the vacuum adjusting member to adjust the vacuumizing speed in the vacuum sealing box according to feedback signals of the vacuum degree sensor, so that the vacuum degree is in a preset range.

7. The vacuum heat platener according to claim 6, wherein The processing module is provided with a vacuum degree speed curve, and the vacuum adjusting member is controlled to adjust the speed according to the vacuum degree speed curve.

8. The vacuum heat platener of claim 1, wherein, The air permeation holes have a pore size range of 0.01-3 mm.

9. The vacuum heat platener of claim 1, wherein, The heating element is an electric heating pipe or an electromagnetic coil.

10. The vacuum heat platener of claim 1, wherein, The driving member is a hydraulic cylinder or a servo motor.

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