Solid-state battery pole piece dry mixing device and mixing system

Abstract

The utility model relates to the mixing equipment field used in secondary battery manufacturing, especially relate to a kind of solid-state battery pole piece dry method mixing device and mixing system. Solid-state battery pole piece dry method mixing device includes mixing tank, and mixing tank includes jar body and jar cover, and there is protective gas import on mixing tank, and mixing tank is connected with dust filter, and the outlet of dust filter is connected with negative pressure generating device, and the solid-state battery pole piece dry method mixing device works, and mixing tank forms negative pressure environment inside under the action of negative pressure generating device. Because negative pressure generating device, dust filter and protective gas import are simultaneously arranged, the matching of protective gas import speed by negative pressure generating device and protective gas import, can prevent dust from being taken away in large quantities in mixing process simultaneously, ensure the negative pressure environment in mixing tank under protective atmosphere, to prevent dust and harmful gas from escaping from the cooperation position of the jar body and jar cover of mixing tank, ensure the safety of surrounding environment.

Description

Technical Field

[0001] This utility model relates to the field of mixing equipment used in the manufacture of secondary batteries, and in particular to a dry mixing device and mixing system for solid-state battery electrodes. Background Technology

[0002] The preparation process of all-solid-state battery electrodes includes a dry mixing stage. In this stage, materials such as the positive / negative electrodes and solid electrolyte are mixed in a mixing device. This mixing process generates heat, and the accumulation of heat can potentially lead to dust explosions, spontaneous combustion, and other problems. Furthermore, the sulfide electrolyte used in the dry mixing stage generates hydrogen sulfide gas. Under positive pressure within the mixing device, hydrogen sulfide gas and dust can escape from the mixing tank (where the tank body and lid meet) into the surrounding environment, affecting the health of workers. Hydrogen sulfide gas, in particular, is highly toxic; a leak would cause serious harm to nearby workers. Moreover, during the mixing process, the materials themselves contain some moisture, or water vapor is generated after chemical reactions, which can cause the raw materials to clump together, hindering uniform mixing.

[0003] Currently, by installing an air inlet and an air outlet on the mixing tank of the mixing device, and introducing protective gas into the air inlet during the mixing process, which is then discharged from the air outlet, the accumulation of heat and moisture inside the mixing tank can be avoided, thus solving the problems of explosion and raw material agglomeration. However, with the above solution, the introduction of protective gas will create a greater positive pressure inside the mixing tank, which will exacerbate the leakage of dust and harmful gases from the mating area between the tank body and the tank cover. Utility Model Content

[0004] One of the objectives of this invention is to provide a dry mixing device for solid-state battery electrodes, in order to solve the problem that dust and harmful gases in existing mixing devices are prone to leak from the joint between the mixing tank body and the tank cover.

[0005] Meanwhile, the purpose of this utility model is also to provide a mixing system using the above-mentioned solid-state battery electrode dry mixing device.

[0006] To solve the above problems, the solid-state battery electrode dry mixing device of this utility model adopts the following technical solution: the solid-state battery electrode dry mixing device includes a mixing tank, the mixing tank includes a tank body and a tank cover, a protective gas inlet is provided on the mixing tank, the mixing tank is connected to a dust filter, and the outlet of the dust filter is connected to a negative pressure generating device. When the solid-state battery electrode dry mixing device is working, a negative pressure environment is formed inside the mixing tank under the action of the negative pressure generating device.

[0007] The beneficial effects of the solid-state battery electrode dry mixing device: This invention is an improved version of the solid-state battery electrode dry mixing device. In this device, a dust filter is installed in the mixing tank, and the outlet of the dust filter is connected to a negative pressure generator. During the mixing process, a negative pressure environment is formed inside the mixing tank under the action of the negative pressure generator. Because a negative pressure generator, a dust filter, and a protective gas inlet are simultaneously provided, and the speed of the protective gas entering the tank is matched with that of the negative pressure generator, a large amount of dust can be prevented from being drawn away during the mixing process while maintaining a negative pressure environment under a protective atmosphere inside the mixing tank. This prevents dust and harmful gases from escaping from the mating area between the tank body and the lid, ensuring the safety of the surrounding environment.

[0008] The solid-state battery electrode dry mixing system of this utility model adopts the following technical solution:

[0009] A dry mixing system for solid-state battery electrodes includes a dry mixing device for solid-state battery electrodes. The dry mixing device includes a mixing tank, which comprises a tank body and a tank cover. A protective gas inlet is provided on the mixing tank. The mixing tank is connected to a dust filter, and the outlet of the dust filter is connected to a negative pressure generating device. When the dry mixing device for solid-state battery electrodes is working, a negative pressure environment is formed inside the mixing tank under the action of the negative pressure generating device. The protective gas inlet is connected to a protective gas source, and the outlet of the dust filter is connected to a centralized waste gas treatment pipeline.

[0010] The beneficial effects of the solid-state battery electrode dry mixing system: This invention is an improved version of the solid-state battery electrode dry mixing system. In this system, the solid-state battery electrode dry mixing device is equipped with a dust filter for the mixing tank, and the outlet of the dust filter is connected to a negative pressure generator. During the mixing process, a negative pressure environment is formed inside the mixing tank under the action of the negative pressure generator. Because a negative pressure generator, a dust filter, and a protective gas inlet are simultaneously provided, and the speed of the protective gas entering the tank is matched with the speed of the protective gas entering the tank, a negative pressure environment under a protective atmosphere can be maintained inside the mixing tank while preventing a large amount of dust from being drawn away during the mixing process. This prevents dust and harmful gases from escaping from the mating area between the tank body and the lid, ensuring the safety of the surrounding environment. Attached Figure Description

[0011] Figure 1 This is a perspective view of an embodiment of a dry mixing apparatus for solid-state battery electrodes;

[0012] Figure 2 This is a front view of an embodiment of a dry mixing apparatus for solid-state battery electrodes;

[0013] Figure 3 yes Figure 2 AA section view;

[0014] Figure 4 This is a schematic diagram of the can lid.

[0015] In the diagram: 1. Mixing tank; 101. Tank body; 102. Tank cover; 103. Protective gas inlet; 2. Dust filter; 201. Filter outlet; 202. Filter element; 203. Filter housing; 204. Dust suction pipe; 205. Switch valve; 206. Filter bracket; 3. Protective gas backflush device; 301. Solenoid valve; 302. Pulse device; 303. Gas accumulator; 304. Backflush pipe; 4. Pressure sensor; 5. Regulating valve; 6. Protective gas filter; 601. Drain outlet. Detailed Implementation

[0016] The features and performance of this utility model will be further described in detail below with reference to specific embodiments.

[0017] Dust, as fine solid particles, can escape into the external environment through gaps, openings, or weak points in a system under the influence of airflow, mechanical force, or gravity, thus constituting dust leakage. Therefore, by improving these factors, the direction of dust movement can be controlled. For example, when gaps, openings, or weak points cannot be completely avoided, establishing a directionally controlled airflow can control the direction of dust movement, preventing leakage. Based on the above inventive concept, this utility model proposes a technical solution for a dry mixing device and system for solid-state battery electrodes.

[0018] Based on the above inventive concept, the specific implementation method of the solid-state battery electrode dry mixing device of this utility model is as follows:

[0019] like Figures 1-4As shown, the solid-state battery electrode dry mixing device of this invention includes a mixing tank 1. In existing mixing devices, the mixing tank 1 is also called a stirring tank, batching tank, mixing tank, etc. According to its structural form, it can be divided into top-opening lid with sloping bottom type, top-opening lid with conical head type, etc. According to the stirring method, it can be divided into mechanical stirring type, magnetic sealing stirring type, multi-stage crushing and stirring type, etc. This invention does not limit the structural form of the mixing tank 1, and those skilled in the art can choose any of the above-mentioned types of mixing tanks as needed. As a typical structure of the mixing tank 1, it includes a tank body 101 and a tank cover 102, wherein the tank cover 102 is located at the top of the tank body 101 and is sealed to the tank body 101. It should be noted that although the fit between the lid 102 and the body 101 is a sealed fit, it cannot be absolutely sealed. Compared with other parts of the mixing tank 1, this fit is still a weak point in the sealing of the mixing tank. Without auxiliary measures, dust and harmful gas leakage will inevitably occur at this location.

[0020] To prevent heat buildup and undesirable chemical reactions during operation of the mixing tank 1, and to dry the interior of the mixing tank 1, such as... Figure 4 As shown, a protective gas inlet 103 is provided on the mixing tank 1, and a dust filter 2 is connected to the mixing tank 1. The outlet of the dust filter 2 is connected to a negative pressure generator (not shown in the figure). The protective gas inlet 103 is used to connect to a protective gas source to continuously introduce protective gas into the mixing tank 1 and discharge the protective gas from the dust filter 2. The flowing protective gas is used to carry away the heat, dust, water vapor, and harmful gases generated during the mixing process from the mixing tank 1 for centralized treatment. In addition, when the solid-state battery electrode dry mixing device is working, the negative pressure generator can be activated to create a negative pressure environment inside the mixing tank 1. This eliminates the airflow from the mating point between the tank cover 102 and the tank body 101, thereby preventing dust or harmful gases from leaking from the mating point between the tank cover 102 and the tank body 101.

[0021] The protective gas can be an inert gas such as nitrogen. The protective gas source can be, for example, a gas station located in the production site. Since most production sites are equipped with nitrogen gas stations, using a nitrogen gas station directly as the protective gas source is a more ideal solution, offering advantages such as low cost and ease of use. Of course, in some embodiments, the protective gas source can also be a bottled inert gas (e.g., nitrogen), which is manufactured in a corresponding gas production facility and transported to the mixing tank workplace via gas cylinders.

[0022] Taking the mixing of positive / negative electrodes and solid electrolytes during the dry mixing stage of all-solid-state battery electrode preparation as an example, in addition to dust, a certain amount of toxic gases such as hydrogen sulfide will be generated during the mixing process. Therefore, the outlet 201 of the dust filter of this utility model should be connected to a corresponding centralized waste gas treatment system. This system can adopt the pipeline system of the production site, and lead the waste gas to a set location through the pipeline system for harmless treatment by physical or chemical means, or directly lead it to the outside for discharge. Since the outdoor air flows faster, the waste gas containing a small amount of harmful gases will not pose a threat to the environment.

[0023] When using the dry mixing device for solid-state battery electrodes of this invention, the protective gas inlet 103 can be connected to a protective gas source, which supplies protective gas to the mixing tank 1 during the mixing process. Simultaneously, a negative pressure generating device guides the dust and harmful gases generated in the mixing tank 1 towards the outlet of the dust filter 2, forming a continuous inert gas flow. During this process, the dust filter intercepts the dust, while the harmful gases are introduced into the centralized waste gas treatment system. The heat generated during the mixing process will be promptly carried out of the mixing tank 1, and the generated dust will be quickly concentrated in the dust filter 2, thereby eliminating two important factors contributing to dust explosions and preventing dust explosions within the mixing tank 1.

[0024] Furthermore, due to the presence of the negative pressure generating device, the mixing tank 1 will maintain a certain negative pressure state. Therefore, even if there is an internal and external communication path at the joint between the tank cover 102 and the tank body 101, only a small amount of ambient gas will enter the mixing tank 1, and there will be no problem of dust and harmful gases spreading to the outside of the mixing tank 1.

[0025] Since the pressure of the protective gas source in the production site may vary, and the raw materials being mixed may also differ, in a preferred embodiment, to maintain an ideal negative pressure state within the mixing tank 1, a regulating valve 5 is connected to the protective gas inlet. The regulating valve 5 controls the intake speed of the protective gas. Furthermore, as a more preferred embodiment, the regulating valve 5 can be a proportional valve. A proportional valve is a hydraulic / pneumatic control device that continuously and proportionally controls the pressure, flow rate, or direction of a fluid (oil or gas) via electronic signals. It falls between traditional on / off valves and high-precision servo valves, balancing control accuracy and cost-effectiveness while possessing strong anti-contamination capabilities. Of course, in other embodiments, the regulating valve 5 can also be an electro-hydraulic servo valve, a digital hydraulic valve, etc., which will not be elaborated upon here.

[0026] To maintain a stable negative pressure in the mixing tank 1, in a preferred embodiment, the negative pressure generating device is connected to a pressure sensor 4. The pressure sensor 4 is located in the mixing tank 1 and can monitor the negative pressure inside the mixing tank 1 in real time. It then transmits the detected negative pressure to the negative pressure generating device, allowing the negative pressure generating device to control its power based on the pressure inside the mixing tank 1. For example, in... Figures 1-4 In the illustrated embodiment, the pressure sensor 4 is mounted on the tank cover 102. In other embodiments, without affecting the normal operation of the mixing tank 1, the pressure sensor 4 can also be mounted on the tank body 101.

[0027] After a certain period of operation, a large amount of dust will accumulate on the filter element 202 of the dust filter 2. This accumulated dust will reduce the air permeability of the dust filter, increase air resistance, and lead to increased power consumption of the negative pressure generating device. In addition, the accumulated dust is a useful substance, and if this substance cannot be effectively utilized, it will result in a certain degree of waste. Therefore, in a preferred embodiment, the dust filter 2 is equipped with a protective gas backflushing device 3, which is used to backflush protective gas onto the filter element 202 of the dust filter.

[0028] The protective gas backflushing device 3, by backflushing the filter element 202, can blow the dust adhering to the filter element 22 away from the filter element 202, causing it to fall into the mixing tank 1 under the action of backflushing force and gravity. This allows for effective utilization of the dust material and also effectively cleans the filter element 202, ensuring its air permeability. Since the gas used for backflushing is still the protective gas, backflushing the filter element 202 will not disrupt the protective gas atmosphere within the mixing tank 1. Figure 1 In the embodiment shown, the protective gas backflush device 3 adopts a pulse backflush device, which specifically includes a solenoid valve 301 and a pulse device 302. The structure and working principle of the pulse backflush device are existing technologies and will not be described in detail here.

[0029] The number of backflush points directly affects the backflush effect. Therefore, in a preferred embodiment, the protective gas backflush device 3 is equipped with a gas storage tank 303. The gas storage tank 303 can be connected to a gas source during use as a buffer to obtain a relatively stable backflush gas pressure. The gas storage tank 303 is equipped with two or more backflush pipes 304 leading to the interior of the dust filter. For example, in… Figure 1 In the embodiment shown, two backflush pipes 304 are connected to the gas storage tank 303, and the two backflush pipes 304 are arranged side by side.

[0030] Since the protective gas source may contain certain impurities, such as water vapor, oil vapor, dust, etc., in order to ensure the cleanliness of the protective gas entering the mixing tank 1, a protective gas filter 6 is connected to the gas storage tank 303. The protective gas filter 6 has a filter shell, and a drain port 601 is provided on the filter shell so that the drain port can be opened periodically or as needed to clean and maintain the protective gas filter.

[0031] To ensure full recovery of the dust blown away, in a preferred embodiment, the bottom of the filter housing 203 of the dust filter 2 is funnel-shaped and connected to the mixing tank via a dust suction pipe 204. Of course, in other embodiments, the filter housing 203 of the dust filter 2 can also be flat-bottomed, sloping-bottomed, etc., which should be understood by those skilled in the art and will not be elaborated here.

[0032] To reduce the amount of protective gas used and the power consumption of the negative pressure generating device, a switching valve 205 is installed on the dust suction pipe 204. By using the switching valve 205, when the pressure sensor 4 detects that the negative pressure in the mixing tank 1 has reached the target value range, the switching valve 205 can be used to disconnect the dust filter 2 from the mixing tank 1, maintaining pressure (negative pressure) in the mixing tank 1. When the pressure sensor detects that the negative pressure in the mixing tank 1 has exceeded the target value range, the switching valve 205 can be opened to draw negative pressure from the mixing tank. Based on this, the switching valve 205 is a butterfly valve. In other embodiments, to achieve the same function, the switching valve 205 can be replaced by any other type of switching valve.

[0033] The magnitude of the negative pressure environment created by the negative pressure generating device will affect its power and the amount of dust sucked away. Therefore, the magnitude of the negative pressure environment should be designed. In a preferred embodiment, the magnitude of the negative pressure environment is 0 Pa to (-20) Pa, for example, it can be 0 Pa, -5 Pa, -8 Pa, -12 Pa, -17 Pa, -20 Pa, etc.

[0034] Bag filters, as a typical type of gas filter, have advantages such as high efficiency and energy saving, outstanding processing capacity, convenient operation, low maintenance cost, reliable structure, and obvious economic advantages. Therefore, in a preferred embodiment, such as... Figure 3 As shown, the dust filter 2 is a bag filter.

[0035] Furthermore, as a typical negative pressure generating device, the negative pressure generating device is, in a typical embodiment, a negative pressure fan. The type and model of the negative pressure fan can be selected according to actual needs, and will not be elaborated here.

[0036] In a preferred embodiment, the dust filter 2 is installed on the tank cover 102. Combined with the arrangement of the aforementioned suction pipe 204, the mixing tank 1 and the dust filter 2 form a gourd-like structure. The suction pipe 204 between them acts as a throat, thereby limiting the amount of dust sucked into the dust filter 2 and saving the overall footprint of the device. To ensure the reliability of the dust filter 2 installation, a dedicated filter bracket 206 is also provided on the tank cover 102. The filter bracket 206 integrates the tank cover 102 and the dust filter 2. Since the tank cover 102 can be separated from the tank body 101, when the dust filter 2 needs maintenance, the tank cover 102 and the dust filter 2 can be lifted together from the tank body 101 and placed on the ground, thus facilitating the maintenance of the dust filter 2.

[0037] Of course, in other embodiments, the dust filter 2 can also be connected to the side opening of the tank 101. In this case, the dust filter 2 can be installed by setting a corresponding floor support. In order to ensure the compactness of the structure, a suspended support can also be set on the side of the tank 101, and the dust filter 2 can be installed on the suspended support.

[0038] Specific implementation method of the solid-state battery electrode dry mixing system of this utility model:

[0039] This utility model discloses a dry mixing system for solid-state battery electrodes, comprising a dry mixing device for solid-state battery electrodes. This dry mixing device is the same as described in this utility model. Since the structure and principle of the dry mixing device for solid-state battery electrodes have already been described in detail above, they will not be repeated here. The protective gas inlet is connected to a protective gas source, and the outlet of the dust filter is connected to a centralized waste gas treatment pipeline. The protective gas source can be a gas station at the production site or a bottled gas source (gas cylinder). The centralized waste gas treatment pipeline can be a pipeline already installed at the production site, which will not be elaborated upon here.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A dry mixing apparatus for solid-state battery electrodes, comprising a mixing tank, the mixing tank including a tank body and a tank cover, and a protective gas inlet provided on the mixing tank, characterized in that, The mixing tank is connected to a dust filter, and the outlet of the dust filter is connected to a negative pressure generating device. When the solid-state battery electrode dry mixing device is working, a negative pressure environment is formed inside the mixing tank under the action of the negative pressure generating device.

2. The solid-state battery electrode dry mixing device according to claim 1, characterized in that, The protective gas inlet is connected to a regulating valve to control the intake speed of the protective gas.

3. The solid-state battery electrode dry mixing apparatus according to claim 2, characterized in that, The regulating valve is a proportional valve.

4. The solid-state battery electrode dry mixing apparatus according to claim 1, characterized in that, The negative pressure generating device is connected to a pressure sensor, which is located in the mixing tank and is used to control the power of the negative pressure generating device according to the pressure inside the mixing tank.

5. The solid-state battery electrode dry mixing apparatus according to any one of claims 1-4, characterized in that, The dust filter is equipped with a protective gas backflushing device, which is used to backflush protective gas onto the filter element of the dust filter.

6. The solid-state battery electrode dry mixing apparatus according to claim 5, characterized in that, The bottom of the filter housing of the dust filter is designed as a funnel shape and is connected to the mixing tank through a dust suction pipe.

7. The solid-state battery electrode dry mixing apparatus according to claim 6, characterized in that, A switch valve is installed on the dust extraction pipe.

8. The solid-state battery electrode dry mixing apparatus according to claim 7, characterized in that, The switching valve is a butterfly valve.

9. The solid-state battery electrode dry mixing apparatus according to claim 5, characterized in that, The protective gas backflush device is connected to a gas storage tank, and the gas storage tank is equipped with two or more backflush pipes leading to the interior of the dust filter.

10. The solid-state battery electrode dry mixing apparatus according to any one of claims 1-4, characterized in that, The negative pressure of the negative pressure environment is 0 Pa - (-20) Pa.

11. The solid-state battery electrode dry mixing apparatus according to any one of claims 1-4, characterized in that, The dust filter is a bag filter.

12. The solid-state battery electrode dry mixing apparatus according to any one of claims 1-4, characterized in that, The negative pressure generating device is a negative pressure fan.

13. The solid-state battery electrode dry mixing apparatus according to any one of claims 1-4, characterized in that, The dust filter is installed on the can lid.

14. A dry mixing system for solid-state battery electrodes, characterized in that, The device includes a dry mixing apparatus for solid-state battery electrodes as described in any one of claims 1-13, wherein the protective gas inlet of the dry mixing apparatus for solid-state battery electrodes is connected to a protective gas source, and the outlet of the dust filter of the dry mixing apparatus for solid-state battery electrodes is connected to a centralized waste gas treatment pipeline.

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