Powder mixing equipment and battery production system

Abstract

The utility model relates to powder mixing equipment and a battery production system. The powder mixing equipment comprises a mixing tank, a stirring mechanism and a heating device, the mixing tank comprises a mixing cavity, a feeding port and a discharging port, the feeding port and the discharging port are both communicated with the mixing cavity, a feeding opening and closing piece used for opening and closing the feeding port is arranged at the feeding port, and a discharging opening and closing piece used for opening and closing the discharging port is arranged at the discharging port. The stirring mechanism is located in the mixing cavity, and the heating device is arranged on the mixing tank and / or the stirring mechanism. The mixing tank further comprises a negative-pressure air exhaust pipeline and a dry air exhaust and supply pipeline which are both communicated with the mixing cavity. According to the technical scheme, the battery powder can be dried in the material mixing process, the battery powder mixing effect is better, the quality of a pole piece prepared from the mixed and dried battery powder is good, and the performance of a battery can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of powder mixing devices, and in particular to powder mixing equipment and battery production systems. Background Art

[0002] The first step in the mixing process of lithium battery production is to mix the main material and auxiliary material powder particles evenly. If the main material and auxiliary material powder particles have a high moisture content, they will not be mixed and dispersed evenly, which will seriously affect the quality of the slurry when it is shipped, thereby affecting the coating efficiency and the quality of the electrode. The uneven dispersion of the main material and auxiliary materials will also affect the performance of the finished battery cell, and even cause lithium precipitation in severe cases. Utility Model Content

[0003] Based on this, it is necessary to provide a powder mixing equipment and a battery production system to address the problem of poor battery cell performance caused by uneven mixing of battery powder.

[0004] A powder mixing device, comprising:

[0005] A mixing tank, comprising a mixing chamber, and an inlet and an outlet both connected to the mixing chamber, wherein the inlet is provided with an inlet opening and closing member for opening and closing the inlet, and the outlet is provided with an outlet opening and closing member for opening and closing the outlet;

[0006] a stirring mechanism located in the mixing chamber; and

[0007] A heating device, arranged in the mixing tank and / or the stirring mechanism;

[0008] Wherein, the mixing tank also includes a negative pressure exhaust pipeline and a dry gas supply pipeline both connected to the mixing chamber.

[0009] In some embodiments, the negative pressure exhaust pipeline is used to exhaust negative pressure to the mixing chamber, and the dry gas supply pipeline is used to introduce dry gas into the mixing chamber, and the two are not performed at the same time.

[0010] In some embodiments, the powder mixing device further comprises a first filter element, and the first filter element is disposed at the negative pressure exhaust pipeline.

[0011] In some embodiments, the powder mixing device further includes a second filter element, and the second filter element is disposed at the dry gas supply pipeline.

[0012] In some embodiments, the heating device is disposed on the inner wall of the mixing chamber;

[0013] The negative pressure exhaust pipeline and the dry gas supply pipeline are located above the mixing chamber, and the heating device is arranged on the inner wall of the side circumference of the mixing chamber.

[0014] In some embodiments, the powder mixing device further comprises a feeding bin, which is disposed at the feeding port and has a feeding channel for guiding the powder into the mixing chamber;

[0015] The feeding channel comprises a trumpet section, and the large-diameter end of the trumpet section is located above the small-diameter end thereof.

[0016] In some embodiments, the feeding channel further includes a straight tube section located below the horn section, and the straight tube section is connected between the horn section and the mixing chamber.

[0017] In some embodiments, the cross-sectional area of ​​the mixing chamber decreases from top to bottom, and the discharge port is located below the mixing chamber.

[0018] In some embodiments, the stirring mechanism includes a stirring shaft and stirring blades, the stirring blades are arranged around the stirring shaft, and the mixing chamber is arranged to rotate around the rotation center axis of the stirring shaft;

[0019] One end of the stirring blade is fixed to the lower end of the stirring shaft, and the other end extends upward, and the distance between the stirring blade and the stirring shaft is arranged to increase from bottom to top;

[0020] The stirring blade is spaced apart from the inner wall of the mixing chamber.

[0021] A battery production system includes the powder mixing device as described in the above embodiment.

[0022] In actual application, the above-mentioned powder mixing equipment and battery production system use a heating device and a stirring device to dry and mix the powder in the mixing chamber. While drying and mixing, the negative pressure exhaust pipeline and the dry gas supply pipeline can be used to exhaust negative pressure and pass dry gas into the mixing chamber. The dry gas introduced can accelerate the departure of moisture from the powder, and the negative pressure can quickly take away the moist gas in the mixing tank. The two cooperate to realize the effect of circulating breathing of the mixing chamber, and the powder drying effect is good and the drying efficiency is high.

[0023] Moreover, after the powder drying and mixing is completed, the negative pressure exhaust pipe can be used to continuously maintain the negative pressure to extract the water vapor that penetrates into the mixing chamber, so that the mixing tank can ensure the dryness of the powder during the buffering of the powder and prevent the powder from getting damp and agglomerating. In addition, during the feeding stage, the dry gas supply pipeline can be used to introduce dry gas into the mixing chamber to balance the air pressure inside and outside the mixing chamber, facilitate the discharge of the powder in the mixing chamber, and also help to ensure the dryness of the powder.

[0024] In this way, the mixed powder provided by the powder mixing equipment has good dryness, which helps to improve the quality of the battery pole pieces and further improve the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the powder mixing equipment of some embodiments of the present application.

[0027] Figure 2 This is a schematic diagram of the structure of powder mixing equipment according to other embodiments of the present application.

[0028] The reference numerals in the specific implementation manner are as follows:

[0029] 100. Powder mixing equipment;

[0030] 10. Mixing tank; z. Mixing chamber; 11. Inlet; 12. Outlet; 13. Inlet opening and closing parts; 14. Outlet opening and closing parts; 15. Negative pressure exhaust pipeline; 16. Dry gas supply pipeline;

[0031] 20. stirring mechanism; 21. stirring shaft; 22. stirring blade;

[0032] 30. Heating device;

[0033] 40. a first filter element; 50. a second filter element;

[0034] 60. Feeding bin; 61. Horn section; 62. Straight tube section. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships, if any, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, if present, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, if any, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, if it appears, unless otherwise clearly specified and limited, a first feature “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature “above”, “above” and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature “below”, “below” and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0041] In the embodiments of the present application, a powder mixing device and a battery production system are provided to solve the problem of poor performance of battery cells caused by uneven mixing of battery powders as mentioned in the background art. It should be noted that the powder mixing device in the embodiments of the present application can be used for mixing powders in other fields in addition to being used for mixing battery powders. In the battery production system in the embodiments of the present application, after mixing the main material powder and the auxiliary material powder of the battery using the powder mixing device to obtain a mixed powder, the mixed powder can be used to prepare the active slurry of the battery pole piece, and the pole piece active slurry is coated on the current collector by a coating device to obtain a pole piece, and a battery cell is prepared by the pole piece. The powder mixing device in the embodiments of the present application is introduced in detail below.

[0042] Please refer to Figure 1 and Figure 2 , the powder mixing device 100 provided in the embodiment of the present application includes a mixing tank 10, a stirring mechanism 20 and a heating device 30. The mixing tank 10 includes a mixing chamber z, and an inlet 11 and an outlet 12 both connected to the mixing chamber z. The inlet 11 is provided with an inlet opening and closing member 13 for opening and closing the inlet 11, and the outlet 12 is provided with an outlet opening and closing member 14 for opening and closing the outlet 12. The stirring mechanism 20 is located in the mixing chamber z, and the heating device 30 is arranged in the mixing tank 10 and / or the stirring mechanism 20. Among them, the mixing tank 10 also includes a negative pressure exhaust pipeline 15 and a dry exhaust supply pipeline both connected to the mixing chamber z.

[0043] The inlet of the mixing tank 10 is used for supplying battery powder into the mixing chamber z, and the outlet 12 of the mixing tank 10 is used for supplying the mixed material in the mixing chamber z to flow out of the mixing tank 10. The feed port 11 is usually located above the outlet 12 to accelerate the input and outflow of the powder by utilizing the weight of the powder. The feed opening and closing member 13 and the discharge opening and closing member 14 are used to open and close the feed port 11 and the discharge port 12 respectively, and both can be cover-like structures, which can be rotatably or movably arranged on the mixing tank 10 to open and close the corresponding feed port when moving; both can also be valves specially used for powders, such as butterfly valves, iris valves, etc., which are not specifically limited here.

[0044] At least the stirring part of the stirring mechanism 20 is located in the mixing chamber z, and the stirring mechanism 20 can stir and mix the powder in the mixing chamber z when rotating. The structure of the stirring mechanism 20 can refer to conventional settings.

[0045] The heating device 30 can heat the powder in the mixing tank 10 to evaporate the moisture in the powder, so that the powder is dry and the dried powder is easier to mix evenly. The heating device 30 is arranged on the mixing tank 10, or on the stirring mechanism 20, or both are provided with the heating device 30. There are many structural forms of the heating device 30, for example, the heating device 30 is a heating plate, and the powder is dried by the heating plate; for another example, the heating device 30 is a heating plate, and the heating liquid is circulated in the heating plate for cooling. Of course, there are also many options for the setting position of the heating device 30 on the mixing tank 10 and the stirring mechanism 20, and those skilled in the art can flexibly set it. For example, the heating device 30 is arranged in the interlayer between the mixing tank 10 and the stirring mechanism 20, and for another example, the heating device 30 is arranged on the inner wall of the mixing chamber z, or the stirring mechanism 20 is located on the outer wall of the mixing chamber z.

[0046] The negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16 can be formed by pipelines independently arranged on the mixing tank 10, or can be formed by channels formed inside the tank body of the mixing tank 10. The negative pressure exhaust pipeline 15 is used to connect to the negative pressure source to draw negative pressure to the mixing chamber z. The dry gas supply pipeline 16 is used to connect to the dry gas supplier to pass dry gas into the mixing chamber z.

[0047] The two actions of pumping negative pressure and introducing dry gas can be performed simultaneously or not. When the two actions are performed simultaneously, it can be but not limited to be set that the gas content taken away by the negative pressure pumping is greater than the dry gas introduction content.

[0048] The general working process of the powder mixing device 100 is:

[0049] The first step is feeding: after the discharge opening and closing member 14 closes the discharge port 12, the battery main material powder and the auxiliary material powder are fed into the mixing chamber z through the feed port 11. After the feeding is completed, the feed opening and closing member 13 closes the feed port 11.

[0050] The second step is drying the mixed material: the heating device 30 is started to raise the temperature in the mixing tank 10 to the target temperature. The stirring mechanism 20 is started to mix the powder material.

[0051] The third step is dehumidification: keep the control of the second step, use the negative pressure exhaust pipeline 15 to draw negative pressure into the mixing chamber z, and use the dry gas supply pipeline 16 to pass dry gas into the mixing chamber z for a certain period of time until the powder is dried.

[0052] The fourth step is to cache the material: the negative pressure exhaust pipeline 15 continuously exhausts negative pressure into the mixing chamber z.

[0053] The fifth step is unloading: stop pumping negative pressure, and introduce dry gas into the mixing chamber z through the dry gas supply pipeline 16, and then the unloading opening and closing part opens the unloading port until the unloading is completed.

[0054] In actual application, the powder mixing equipment 100 described above dries and mixes the powder in the mixing chamber z through the heating device 30 and the stirring device. While drying and mixing, the negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16 can be used to exhaust negative pressure and pass dry gas into the mixing chamber z. The introduced dry gas can accelerate the departure of moisture from the powder, and the negative pressure can quickly take away the moist gas in the mixing tank 10. The two cooperate to realize the circulating breathing effect of the mixing chamber z, and the powder drying effect is good while the drying efficiency is high.

[0055] Moreover, after the powder drying and mixing is completed, the negative pressure exhaust pipe can be used to continuously maintain the negative pressure to extract the water vapor that penetrates into the mixing chamber z, so that the mixing tank can ensure the dryness of the powder during the process of caching the powder and prevent the powder from getting damp and agglomerating. In addition, during the feeding stage, the dry gas supply pipeline 16 can be used to pass dry gas into the mixing chamber z, so that the air pressure inside and outside the mixing chamber z is balanced, which is convenient for the discharge of the powder in the mixing chamber z and is also conducive to ensuring the dryness of the powder.

[0056] In this way, the mixed powder provided by the powder mixing device 100 has good dryness, which helps to improve the quality of the battery pole pieces and further improve the performance of the battery.

[0057] Specifically in some embodiments, the negative pressure exhaust pipeline 15 is used to exhaust negative pressure to the mixing chamber z, and the dry gas supply pipeline 16 is used to introduce dry gas into the mixing chamber z, and the two are not performed at the same time.

[0058] In actual operation, in the dehumidification step, the negative pressure exhaust pipeline 15 is first used to exhaust negative pressure into the mixing chamber z, so that the air pressure in the tank is maintained at a negative pressure for a certain period of time; then the exhaust of negative pressure is stopped, and dry gas is introduced into the mixing chamber z for a certain period of time using the dry gas supply pipeline 16; this cycle is repeated many times until the powder is dried.

[0059] In this way, the dry gas stays in the mixing tank 10 for a longer time, can penetrate into the internal powder in the mixing tank 10, and accelerate the separation of moisture from the internal powder. In addition, the negative pressure pumping and the introduction of the dry gas are not performed at the same time, which can reduce the power requirement of the negative pressure source and reduce energy consumption.

[0060] Specifically, the powder mixing equipment 100 includes a negative pressure source and a dry gas supplier, the negative pressure source is connected to the negative pressure exhaust pipeline 15, and the dry gas supplier is connected to the dry gas supply pipeline 16. The negative pressure generator and the dry gas supplier do not work at the same time, so that the negative pressure extraction and the dry gas passage are not carried out at the same time.

[0061] In some embodiments, reference Figure 1 and Figure 2 The powder mixing device 100 further includes a first filter 40, which is disposed at the negative pressure exhaust pipeline 15. During the negative pressure exhaust process, the powder is light and easily carried away by the negative pressure. At this time, the first filter 40 is disposed at the negative pressure exhaust pipeline 15 to prevent the powder from being carried away by the negative pressure exhaust pipeline 15, resulting in powder quality loss and inaccurate mixed powder ratio.

[0062] The first filter element 40 may be, but is not limited to, a filter net. The first filter element 40 is usually disposed at the inlet of the negative pressure exhaust pipeline 15 .

[0063] In some embodiments, please refer to Figure 1 and Figure 2 The powder mixing device 100 further includes a second filter 50, which is disposed at the dry gas supply pipeline 16. The powder in the mixing chamber z is easy to enter the dry gas supply pipeline 16, affecting the mixing ratio. At this time, the second filter 50 is disposed at the dry gas supply pipeline to prevent the powder particles from being sucked into the pipeline.

[0064] The second filter element 50 may be, but is not limited to, a filter mesh. The second filter element 50 is usually disposed at the inlet of the dry gas supply pipeline 16 .

[0065] In some embodiments, please refer to Figure 1 and Figure 2 , the heating device 30 is arranged on the inner wall of the mixing chamber z. Specifically, the heating device 30 can be fixed to the inner wall of the mixing chamber z by fasteners, but is not limited to it. The heating device 30 is arranged on the inner wall of the mixing chamber z, the heating device 30 is closer to the powder, the heat utilization rate of the heating device 30 is high, and the drying efficiency is high. Moreover, the installation of the heating device 30 is easy to achieve.

[0066] Specifically in the embodiment, the negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16 are located above the mixing chamber z, and the heating device 30 is arranged on the inner wall of the side circumference of the mixing chamber z. At this time, the negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16 do not interfere with the heating device 30, and the layout of the heating device 30 is more convenient. Moreover, the negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16 are arranged above the mixing chamber z, and the powder is not easy to block the negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16, which is conducive to the smooth extraction of negative pressure and the smooth passage of dry gas.

[0067] In some embodiments, please refer to Figure 2The powder mixing device 100 further includes a feeding bin 60, which is disposed at the feeding port 11. The feeding bin 60 has a feeding channel for guiding the powder into the mixing chamber z. The feeding channel includes a trumpet section 61, and the large-diameter end of the trumpet section 61 is located above the small-diameter end thereof.

[0068] Typically, the feed port 11 is located above the mixing chamber z, and the feeding bin 60 is located at the top of the mixing tank 10. The powder can enter the mixing chamber z through the feeding channel, and the feed opening and closing member 13 can be arranged at the entrance of the feeding bin 60.

[0069] The feeding channel has a trumpet section 61, and the large-diameter end of the trumpet section 61 is located at the top, that is, the powder passes through the large-diameter end and the small-diameter end and enters the mixing chamber z. The trumpet section 61 is usually located at the opening end of the feeding channel.

[0070] At this time, the powder is fed through the bell mouth of the feeding bin 60. The opening of the feeding bin 60 has a larger diameter, which makes it easier for the powder to enter the feeding bin 60, greatly facilitating the feeding of the powder.

[0071] Further to the embodiments, please refer to Figure 2 The feeding channel also includes a straight section 62 located below the trumpet section 61, and the straight section 62 is connected between the trumpet section 61 and the mixing chamber z. The outer diameter of the straight section 62 is roughly consistent with the diameter of the feed inlet 11. The arrangement of the straight section 62 not only makes the contact area between the feeding bin 60 and the feed inlet 11 large and the installation stable, but also can be matched with the small-diameter feed inlet 11, so as to avoid the feed inlet 11 being too large, which is not conducive to the layout of other structures of the mixing tank 10.

[0072] In some embodiments, please refer to Figure 2 The cross-sectional area of ​​the mixing chamber z decreases from top to bottom, and the discharge port 12 is located below the mixing chamber z.

[0073] The cross section of the mixing chamber z refers to the horizontal cross section. Specifically, the inner wall of the mixing chamber z can be a straight wall or an arc-shaped wall. At this time, the cross-sectional area of ​​the mixing chamber z decreases from top to bottom, and the mixing chamber z presents a cavity structure that is larger at the top and smaller at the bottom. Under the guidance of the inner wall of the mixing chamber z, the mixed powder is easier to enter the material outlet 12, avoiding the accumulation of powder in the mixing chamber z.

[0074] For details in the embodiments, please refer to Figure 2 The stirring mechanism 20 includes a stirring shaft 21 and a stirring blade 22. The stirring blade 22 is arranged around the stirring shaft 21, and the mixing chamber 22 is arranged to rotate around the rotation center of the stirring shaft 21. One end of the stirring blade 22 is fixed to the lower end of the stirring shaft 21, and the other end extends upward, and the distance between the stirring blade 22 and the stirring shaft 21 is arranged to increase from bottom to top.

[0075] The stirring shaft 21 is connected to a driving device (such as a motor) and rotates around its rotation center under the action of the driving device. The stirring shaft 21 can be centrally symmetrical with respect to its rotation center axis. The mixing chamber z is a rotary structure, and its rotation center axis coincides with the rotation center axis of the stirring shaft 21.

[0076] The stirring blade 22 can be integrally arranged on the stirring shaft 21, or can be separately arranged on the stirring shaft 21. The lower end of the stirring blade 22 is connected to the lower end of the stirring shaft 21, and the distance between the stirring blade 22 and the stirring shaft 21 is arranged to increase from bottom to top, so that the stirring blade 22 can be roughly parallel to the inner wall of the mixing chamber z, and the stirring range of the stirring blade 22 can be configured to be larger, which helps to improve the mixing effect of the powder.

[0077] In some embodiments, please refer to Figure 2 The stirring blade 22 is spaced from the inner wall of the mixing chamber z. The space formed by the two is connected to the discharge port 12, which makes it easier for the powder to enter the discharge port 12 and prevents the powder from being blocked by the stirring blade 22 and staying in the mixing chamber z. At the same time, the stirring blade 22 and the inner wall of the mixing chamber z do not rub against each other, which can increase the service life of both.

[0078] Of course, in other embodiments, the stirring blade 22 may also abut against the inner wall of the mixing chamber z.

[0079] In a specific embodiment of the present application, please refer to Figure 2 The powder mixing device 100 includes the above-mentioned mixing tank 10, the stirring mechanism 20 and the heating device 30. The mixing tank 10 is provided with a negative pressure exhaust pipeline 15, a dry gas supply pipeline 16 and a material inlet 11 at its top, and a material outlet 12 at its bottom. Its mixing chamber z is a conical rotating chamber. The heating device 30 is arranged on the lateral peripheral wall of the mixing chamber z. The stirring mechanism 20 rotates around the rotating central axis of the mixing chamber z. Filters are arranged at both the negative pressure exhaust pipeline 15 and the dry gas supply pipeline 16.

[0080] In addition, the embodiment of the present application further provides a battery production system, comprising the powder mixing device 100 in the above embodiment. The powder mixing device 100 is used to mix the main material powder and the auxiliary powder for the battery.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A powder mixing device, characterized in that: include: A mixing tank (10) comprises a mixing chamber (z), and an inlet (11) and an outlet (12) both of which are in communication with the mixing chamber (z); the inlet (11) is provided with an inlet opening and closing member (13) for opening and closing the inlet (11); and the outlet (12) is provided with an outlet opening and closing member (14) for opening and closing the outlet (12); A stirring mechanism (20) is located in the mixing chamber (z); and A heating device (30) is arranged in the mixing tank (10) and / or the stirring mechanism (20); Wherein, the mixing tank (10) further comprises a negative pressure exhaust pipeline (15) and a dry gas supply pipeline (16) both of which are connected to the mixing chamber (z).

2. The powder mixing equipment according to claim 1, characterized in that: The negative pressure exhaust pipeline (15) is used to exhaust negative pressure in the mixing chamber (z), and the dry gas supply pipeline (16) is used to introduce dry gas into the mixing chamber (z), and the two operations are not performed simultaneously.

3. The powder mixing equipment according to claim 1, characterized in that: The powder mixing device further comprises a first filter element (40), wherein the first filter element (40) is arranged at the negative pressure exhaust pipeline (15).

4. The powder mixing equipment according to claim 1, characterized in that: The powder mixing device further comprises a second filter element (50), wherein the second filter element (50) is arranged at the drying gas supply pipeline (16).

5. The powder mixing equipment according to claim 1, characterized in that: The heating device (30) is arranged on the inner wall of the mixing chamber (z); The negative pressure exhaust pipeline (15) and the dry gas supply pipeline (16) are located above the mixing chamber (z), and the heating device (30) is arranged on the inner wall of the side circumference of the mixing chamber (z).

6. The powder mixing equipment according to claim 1, characterized in that: The powder material mixing device further comprises a feeding bin (60), wherein the feeding bin (60) is arranged at the feeding port (11), and the feeding bin (60) has a feeding channel for guiding the powder material into the mixing chamber (z); The feeding channel comprises a trumpet section (61), wherein the large-diameter end of the trumpet section (61) is located above the small-diameter end thereof.

7. The powder mixing device according to claim 6, characterized in that: The feeding channel further comprises a straight tube section (62) located below the trumpet section (61), and the straight tube section (62) is connected between the trumpet section (61) and the mixing chamber (z).

8. The powder mixing equipment according to claim 1, characterized in that: The cross-sectional area of ​​the mixing chamber (z) decreases from top to bottom, and the discharge port (12) is located below the mixing chamber (z).

9. The powder mixing device according to claim 7, characterized in that: The stirring mechanism (20) comprises a stirring shaft (21) and stirring blades (22), wherein the stirring blades (22) are arranged around the stirring shaft (21), and the mixing chamber (z) is arranged to rotate around the rotation center axis of the stirring shaft (21); One end of the stirring blade (22) is fixed to the lower end of the stirring shaft (21), and the other end extends upward, and the distance between the stirring blade (22) and the stirring shaft (21) is arranged to increase from bottom to top; The stirring blade (22) is spaced apart from the inner wall of the mixing chamber (z).

10. A battery production system, characterized in that: It comprises the powder mixing device as described in any one of claims 1 to 9.

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