Front stirring and heating device for extrusion coating of high-solid-content slurry

Abstract

The utility model discloses a front stirring and heating device for extrusion coating of high-solid-content slurry. The front stirring and heating device comprises a stirring mechanism, a heating bin and a heating bin upper cover, the stirring mechanism penetrates through the heating bin upper cover and is sealed with the heating bin upper cover, the heating bin and the heating bin upper cover are sealed, a plurality of heating devices and temperature sensors are installed on the bottom wall of the heating bin, a slurry inlet and a slurry outlet are formed in the side wall of the heating bin, and a heating piece, a heat insulation layer and a shell are sequentially arranged outside the side wall of the heating bin from inside to outside; a heat insulation layer and a shell are sequentially arranged outside the bottom wall of the heating bin. Wherein the heating sheet, the heat insulation layer, the shell, the heating device and the temperature sensor are all of detachable design which is convenient for rapid maintenance or replacement in continuous production; the utility model solves the problems of high viscosity and poor flowability of the lithium battery slurry with high solid content in the coating die head, and is suitable for coating the lithium battery slurry with viscosity of 30000-40000 cp.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of stirring heating devices, specifically to a kind of front stirring heating device of high solid content slurry extrusion coating. BACKGROUND

[0002] Coating process is an important process section of producing lithium battery, and its purpose is to uniformly coat and stick the slurry made of lithium battery positive and negative electrode materials on current collector. The quality of electrode coating directly affects the performance of battery. In the Chinese invention patent with publication number CN117463567A, a kind of lithium battery electrode coating device is disclosed, wherein the coating assembly includes battery slurry preparation mechanism, slurry feeding mechanism, intermediate tank, coating die and the like. With the development of lithium battery technology, new high solid content high viscosity slurry coating is proposed. In the traditional extrusion slot coating process, due to the high viscosity slurry being a non-Newtonian fluid, the viscosity is extremely large and the flowability is poor, which can cause the feeding pressure at the coating die to become larger, and the high viscosity slurry can cause the coating to be uneven, affecting the coating quality.

[0003] In the industry, the method of stirring combined with heating is usually used to reduce the viscosity of the slurry. In the Chinese utility model patent with publication number CN211636189U, a kind of lithium battery cell slurry production processing device is disclosed, which realizes efficient stirring and mixing of the slurry by stirring and heating method, and prepares mixed uniform lithium battery slurry raw materials. However, if the slurry production processing device with stirring and heating functions is directly used before the coating die to reduce the viscosity of the slurry entering the die, it is not feasible. Because in the continuous production coating process, the intermediate slurry feeding mechanism should be in a sealed and high pressure state, but the above-mentioned slurry production processing device is open, and the slurry inlet and outlet are usually arranged at the bottom and top, and the heating component is fixedly arranged and cannot be easily replaced, which cannot meet the continuous production requirements of coating. UTILITY MODEL CONTENT

[0004] To solve the problem of high viscosity slurry entering the die in the coating process, the utility model provides a kind of front stirring heating device of high solid content slurry extrusion coating to reduce the viscosity of the slurry entering the die, improve the flowability of the slurry, and meet the continuous production requirements.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a kind of front stirring heating device of high solid content slurry extrusion coating, including stirring mechanism, heating bin, heating bin upper cover, characterized in that: the stirring mechanism is arranged through the heating bin upper cover, and is arranged in sealing with the heating bin upper cover, and the heating bin and the heating bin upper cover are arranged in sealing, and the side wall of the heating bin is provided with slurry inlet and slurry outlet; heating device is installed at the bottom of the heating bin;

[0006] The outer side wall of the heating bin is sequentially provided with a heating sheet, a heat insulation layer and an outer shell from inside to outside, and the bottom wall of the heating bin is sequentially provided with the heat insulation layer and the outer shell from inside to outside.

[0007] As a limitation of the utility model: the heating sheet is covered on the side wall of the heating bin, and a linear gap of the heating sheet is arranged at the pulp inlet and the pulp outlet for convenient installation and dismounting, one end of the linear gap of the heating sheet extends to the corresponding pulp inlet or pulp outlet, and the other end extends to the outer edge of the heating sheet.

[0008] As a limitation of the utility model: the inner surface of the heating sheet is provided with temperature measuring lines at multiple points, and the heating device is provided with a temperature sensor; the temperature measuring lines and the heating sheet are connected to a temperature controller, and the temperature sensor and the heating device are connected to the temperature controller.

[0009] As a limitation of the utility model: the heat insulation layer of the side wall of the heating bin is covered on the side wall of the heating bin, and a linear gap of the heat insulation layer is arranged at the pulp inlet and the pulp outlet for convenient installation and dismounting, one end of the linear gap of the heat insulation layer extends to the corresponding pulp inlet or pulp outlet, and the other end extends to the outer edge of the heat insulation layer; the heat insulation layer of the bottom wall of the heating bin is provided with a hole through which the power line of the heating sheet and the temperature measuring line pass, and a hole through which the heating device and the temperature sensor are avoided.

[0010] As a limitation of the utility model: the outer shell is an integrated structure of the outer shell side wall and the outer shell bottom wall, the outer shell side wall is provided with a U-shaped groove at the pulp inlet and the pulp outlet for convenient installation of the outer shell from bottom to top, the opening of the U-shaped groove is upward, the bottom is attached to the lower edge of the pulp inlet and the lower edge of the pulp outlet, and the upward slot extends to the edge of the outer shell; the outer shell bottom wall is provided with a hole through which the power line of the heating sheet and the temperature measuring line pass, and a hole through which the heating device and the temperature sensor are avoided.

[0011] As a limitation of the utility model: the pulp inlet and the pulp outlet are arranged at the middle position in the height direction of the side wall of the heating bin.

[0012] As a limitation of the utility model: the linear gap of the heating sheet and the linear gap of the heat insulation layer are staggered at the pulp inlet and the pulp outlet.

[0013] As a limitation of the utility model: the linear gap of the heating sheet is arranged above the pulp inlet and the pulp outlet, and the linear gap of the heat insulation layer is arranged below the pulp inlet and the pulp outlet.

[0014] As a limitation of the utility model: the heating sheet and the heat insulation layer are made of soft material,

[0015] As a limitation of the utility model: the heating sheet is any one of a silica gel heating sheet, a metal wire heating film, a carbon fiber wire heating film and a graphene heating film, and the heat insulation layer is any one of a nano aerogel felt, an aerogel pre-oxidized wire felt and an aerogel heat insulation felt.

[0016] Due to the adoption of the above technical scheme, the utility model has the beneficial effects that, compared with the prior art,

[0017] (1) the utility model discloses a front device of lithium battery pole piece coating process, is located before the coating head, the sealing arrangement is evenly arranged between the stirring mechanism and the heating bin upper cover, the heating bin and the heating bin upper cover in the device, and the sealing, high pressure condition of continuous production of the coating process is met.

[0018] (2) the heating sheet, the heat insulation layer and the shell in the utility model are detachably arranged, the bottom heating device and the temperature sensor are also detachable structures, so that installation and maintenance can be quickly carried out in continuous production. The heating sheet linear gap, the heat insulation layer linear gap and the shell U-shaped groove are arranged in a staggered manner, so that the heat preservation effect is better, and the structure is firm and the appearance is beautiful.

[0019] (3) the pulp inlet and the pulp outlet of the utility model are located at the middle position of the height direction of the side wall of the heating bin, so that the pulp can not be immediately discharged after entering the heating bin, the continuous production is met, and the pulp is fully stirred and heated in the heating bin.

[0020] In summary, the utility model discloses a front process of extrusion coating of high solid content lithium battery pulp, and the sealing, high pressure, detachable parts and the setting of the pulp inlet and the pulp outlet can meet the requirements of continuous production. The initial feeding pressure at the coating die is reduced through the heating and stirring device, the coating of the lithium battery pulp with a viscosity of 3-400,000 cp is suitable, and the coating quality is improved. DRAWINGS

[0021] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0022] Figure 1 It is a three-dimensional structure schematic view of the embodiment of the utility model;

[0023] Figure 2 It is an internal structure schematic view of the embodiment of the utility model;

[0024] Figure 3 It is a heating sheet installation schematic view of the embodiment of the utility model;

[0025] Figure 4 It is a heat insulation layer installation schematic view of the embodiment of the utility model;

[0026] Figure 5 It is a shell installation schematic view of the embodiment of the utility model;

[0027] In the figure: 1 - stirring mechanism, 11 - servo motor, 12 - speed reducer, 13 - transmission bearing, 14 - rotating shaft, 15 - stirring paddle, 16 - axial sealing ring, 2 - heating bin, 3 - heating bin upper cover, 4 - slurry inlet, 5 - slurry outlet, 6 - heating fin, 61 - heating fin linear gap, 7 - heat insulation layer, 71 - heat insulation layer linear gap, 72 - heat insulation layer power line and temperature measuring line through hole, 73 - heat insulation layer heating device and temperature sensor avoiding hole, 8 - shell, 81 - U-shaped groove, 82 - shell power line and temperature measuring line through hole, 83 - shell heating device and temperature sensor avoiding hole, 9 - heating pipe, 10 - temperature sensor. DETAILED DESCRIPTION

[0028] The preferred embodiment of the present application is described below in conjunction with the accompanying drawings. It should be understood that the pre-stirring and heating device for high solid content slurry extrusion coating described herein is a preferred embodiment, which is used only to illustrate and explain the present application, and does not constitute a limitation on the present application.

[0029] The orientation or position relationship described in the present application is based on the orientation relationship in the drawings of the present application, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, a specific orientation structure and operation, therefore it cannot be understood as a limitation on the content protected by the present application.

[0030] Embodiment A pre-stirring and heating device for high solid content slurry extrusion coating

[0031] The present embodiment is Figures 1-5 A pre-stirring and heating device for high solid content slurry extrusion coating, comprising a stirring mechanism 1, a heating bin 2, a heating bin upper cover 3, a slurry inlet 4, a slurry outlet 5, a heating fin 6, a heat insulation layer 7, and a shell 8.

[0032] As shown in Figure 2 The stirring mechanism 1 mainly comprises a servo motor 11, a speed reducer 12, a transmission bearing 13, a rotating shaft 14 and a stirring paddle 15, which drives the rotating shaft 14 and the stirring paddle 15 to continuously stir the slurry in the heating bin 2 through the servo motor 11, the speed reducer 12 and the transmission bearing 13, and the stirring mechanism 1 is installed through the heating bin upper cover 3 and sealed with the heating bin upper cover 3 through the axial sealing ring 16; the number of stirring paddles 15 is set to four, which can be adjusted according to actual needs. The servo motor 11, the speed reducer 12 and the transmission bearing 13 in the stirring mechanism 1 of the present embodiment are all conventional technical means that can realize stirring and control stirring speed function, which are not limited to Figure 2The structure is as follows: The heating chamber 2 and the heating chamber cover 3 are sealed together. In this embodiment, end-face grinding is used for sealing, but other conventional methods can also be used to achieve the sealing function. The side wall of the heating chamber 2 is provided with a slurry inlet 4 and a slurry outlet 5. The slurry inlet 4 and slurry outlet 5 are located on the side wall of the heating chamber 2, preferably at the middle position in the height direction, so that the slurry can be fully stirred and heated after entering the heating chamber 2, and will not be discharged immediately. This device is used before the coating head in the lithium battery electrode coating process and is part of the slurry feeding mechanism. The slurry feeding mechanism requires sealing, high pressure, and continuous production. Therefore, by using the above-mentioned technical means of sealing the stirring mechanism 1 with the heating chamber cover 3, sealing the heating chamber cover 3 with the heating chamber 2, and setting the slurry inlet 4 and slurry outlet 5 at the middle position of the side wall of the heating chamber 2, the slurry is kept in a sealed and high-pressure state, and the continuous production requirements of the coating process are met.

[0033] A heating device is installed at the bottom of the heating chamber 2. In this embodiment, a heating tube 9 is selected. One end of the heating tube 9 is installed in the center of the bottom of the heating chamber 2, and the other end faces the opening of the heating chamber 2, so that the heating tube 9 is in a vertical position in the heating chamber 2. Of course, the bottom heating device can also be other existing technologies with heating functions, such as heating rods. Two to four heating tubes 9 can be installed as needed. In order to facilitate the detection and control of the temperature of the heating tube 9, a temperature sensor 10 is provided near the heating tube 9 to avoid irreversible damage to the slurry caused by excessive local temperature. A temperature sensor 10 is provided at the bottom of the heating chamber 2 for direct detection of the slurry temperature, which can perform closed-loop temperature control. The heating tube 9 and the temperature sensor 10 are connected to a temperature controller (not shown in the figure). The temperature controller controls the heating of the heating tube 9 and monitors the temperature of the heating tube 9 and the slurry in real time until the slurry temperature reaches the required safe temperature range, thereby achieving the purpose of real-time and accurate control of the slurry temperature. The temperature sensor 10 and the temperature controller both adopt existing technologies.

[0034] The heating chamber 2 has a heating element 6, a heat insulation layer 7, and an outer shell 8 that are detachably arranged from the inside to the outside on the side wall. The heating chamber 2 also has a heat insulation layer 7 and an outer shell 8 that are detachably arranged from the inside to the outside on the bottom wall.

[0035] like Figure 3 The diagram shows the heating element 6 after installation: The heating element 6 covers the side wall of the heating chamber 2. Linear notches 61 for easy disassembly and installation are provided at the slurry inlet 4 and slurry outlet 5. One end of the linear notch 61 extends to the corresponding slurry inlet 4 or slurry outlet 5, and the other end extends to the outer edge of the heating element 6. In this embodiment, the heating element 6 is a one-piece design. The linear notch 61 allows for quick replacement and installation of the heating element 6, reducing downtime due to parts replacement and meeting the needs of continuous production. The linear notch 61 can be set at... Figure 3The upper part of the slurry inlet 4 and the slurry outlet 5 can also be provided at the lower part of the slurry inlet 4 and the slurry outlet 5. In the embodiment, the heating sheet 6 is made of silica gel heating sheet, and of course, any other soft heating material can also be used, such as metal wire heating film, carbon fiber heating film, graphene heating film, etc.

[0036] In order to facilitate observation and control of the temperature of the heating sheet 6, temperature measuring lines (not shown in the figure) are arranged at multiple points on the inner surface of the heating sheet 6, which can be obtained by using conventional technical means. The temperature measuring lines and the heating sheet 6 are also connected to a temperature controller (not shown in the figure) connected to the heating pipe 9 and the temperature sensor 10. The temperature of the heating sheet 6 is controlled by the temperature controller, and the temperature of the heating sheet 6 is monitored in real time, so that the temperature of the heating sheet 6 is ensured to be within a safe value range. The heating mode of the device adopts a combined heating mode of the bottom of the heating bin 2 and the side wall of the heating bin 2, which improves the heating efficiency. The temperature in the heating bin 2 is controlled in real time by the temperature controller to avoid damage to the slurry caused by high temperature, so as to achieve the purpose of real-time and accurate temperature control. The heating temperature can be adjusted to 60-95℃, and the temperature control precision is ±1℃.

[0037] As shown in Figure 4 , it is a schematic diagram of the installation of the heat insulation layer 7: the heat insulation layer 7 of the side wall of the heating bin 2 is wrapped on the side wall of the heating bin 2, and the heat insulation layer linear gap 71 is arranged at the slurry inlet 4 and the slurry outlet 5 for easy disassembly and installation. One end of the heat insulation layer linear gap 71 extends to the corresponding slurry inlet 4 or slurry outlet 5, and the other end extends to the outer edge of the heat insulation layer 7; in the embodiment, the heat insulation layer linear gap 71 is used to quickly replace and install the heat insulation layer 7. The heat insulation layer linear gap 71 can be arranged at Figure 4 the lower part of the slurry inlet 4 and the slurry outlet 5, or at the upper part of the slurry inlet 4 and the slurry outlet 5. The heat insulation layer 7 of the bottom wall of the heating bin 2 is provided with a heating sheet power line and a temperature measuring line passing hole 72, and a heating device and temperature sensor avoiding hole 73. The purpose of arranging the heat insulation layer 7 is to reduce heat loss and improve heating efficiency, and to avoid scalding the operator during installation and replacement. In the embodiment, the heat insulation layer 7 is made of soft nanometer aerogel felt, and of course, other soft materials with heat insulation function can also be used, such as aerogel pre-oxidized wire felt and aerogel heat insulation felt.

[0038] As shown in Figure 5 , it is a schematic diagram of the installation of the housing 8: the housing 8 is an integrated structure of the housing side wall and the housing bottom wall. The housing 8 side wall is provided with a U-shaped groove 81 at the slurry inlet 4 and the slurry outlet 5 for easy installation of the housing 8 from bottom to top. The opening of the U-shaped groove 81 is upward, and the bottom is attached to the lower edge of the slurry inlet 4 and the lower edge of the slurry outlet 5, and the upward slot extends to the edge of the housing 8. The bottom wall of the housing 8 is provided with a heating sheet power line and a temperature measuring line passing hole 82, and a heating device and temperature sensor avoiding hole 83.

[0039] In order to achieve better insulation effect, and make the device structure firm, appearance, the heating piece linear notch 61 and the heat insulation layer linear notch 71 and the U-shaped groove 81 of the shell 8 are staggered at the pulp inlet 4 and the pulp outlet 5 in the embodiment. Specifically, as shown in Figure 3 、 4 , 5, the heating piece linear notch 61 is arranged above the pulp inlet 4 and the pulp outlet 5, the heat insulation layer linear notch 71 is arranged below the pulp inlet 4 and the pulp outlet 5, and the U-shaped groove 81 is opened upward so that the heat insulation layer linear notch 71 is completely wrapped in the shell 8.

[0040] When the embodiment is used, the pulp inlet 4 and the pulp outlet 5 are connected with the slurry feeding mechanism and the coating head respectively, the stirring mechanism 1 is sealed with the heating bin upper cover 3, and the heating bin upper cover 3 is sealed with the heating bin 2. The heat insulation layer 7 and the bottom of the shell 8 are provided with corresponding heating piece power line and temperature measuring line through holes, heating device and temperature sensor avoiding holes. During the heating and stirring process, when the heating piece 6, the temperature measuring line, the heat insulation layer 7, the heating device 9, the temperature sensor 10 and the like need to be repaired or replaced, the corresponding parts can be disassembled.

[0041] It should be noted that the above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments, or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pre-stirring and heating device for high-solids content slurry extrusion coating, comprising a stirring mechanism, a heating chamber, and a heating chamber cover, characterized in that: The stirring mechanism is installed through the upper cover of the heating chamber and is sealed to the upper cover of the heating chamber. The heating chamber and the upper cover of the heating chamber are sealed to each other. The side wall of the heating chamber is provided with a slurry inlet and a slurry outlet. A heating device is installed at the bottom of the heating chamber; The heating chamber has a heating element, a heat insulation layer, and an outer shell that are detachably arranged from the inside to the outside on the side wall, and the heating chamber also has a heat insulation layer and an outer shell that are detachably arranged from the inside to the outside on the bottom wall.

2. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 1, characterized in that: The heating element is covered on the side wall of the heating chamber. A linear notch for easy disassembly and installation is provided at the slurry inlet and slurry outlet. One end of the linear notch extends to the corresponding slurry inlet or slurry outlet, and the other end extends to the outer edge of the heating element.

3. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 1, characterized in that: The heating element has multiple temperature measuring lines at various points on its inner surface, and a temperature sensor is provided at the heating device. The temperature measuring lines and the heating element are connected to a temperature controller, and the temperature sensor and the heating device are connected to the temperature controller.

4. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 2, characterized in that: The insulation layer of the heating chamber sidewall is covered with the heating chamber sidewall. Linear notches of the insulation layer are provided at the slurry inlet and slurry outlet for easy disassembly and installation. One end of the linear notch of the insulation layer extends to the corresponding slurry inlet or slurry outlet, and the other end extends to the outer edge of the insulation layer. The insulation layer of the heating chamber bottom wall is provided with through holes for the heating element power cord and temperature measuring wire, and clearance holes for the heating device and temperature sensor.

5. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 1, characterized in that: The outer shell is an integral structure of the outer shell side wall and the outer shell bottom wall. The outer shell side wall is provided with U-shaped grooves at the slurry inlet and slurry outlet to facilitate the installation of the outer shell from bottom to top. The opening of the U-shaped groove is upward, and the bottom is attached to the lower edge of the slurry inlet and the lower edge of the slurry outlet. The groove extends upward to the edge of the outer shell. The outer shell bottom wall is provided with through holes for the heating element power cord and temperature measuring wire, and clearance holes for the heating device and temperature sensor.

6. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 1, characterized in that: The slurry inlet and slurry outlet are located at the middle of the height direction of the side wall of the heating chamber.

7. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 4, characterized in that: The linear notches of the heating element and the linear notches of the insulation layer are staggered at the slurry inlet and slurry outlet.

8. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 7, characterized in that: The linear notch of the heating element is located above the slurry inlet and slurry outlet, while the linear notch of the insulation layer is located below the slurry inlet and slurry outlet.

9. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 1, characterized in that: The heating element and the heat insulation layer are made of soft materials.

10. The pre-stirring and heating device for high solids content slurry extrusion coating according to claim 9, characterized in that: The heating element is any one of silicone heating element, metal wire heating film, carbon fiber heating film, and graphene heating film, and the heat insulation layer is any one of nano aerogel felt, aerogel pre-oxidized fiber felt, and aerogel insulation felt.

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