Sampling device and battery production system

Abstract

The embodiment of the present application provides a sampling device and a battery production system, wherein the sampling device is used for sampling battery powder, and the sampling device includes a sampling tube, a sample storage structure and a negative pressure structure. A sampling port is provided on the sampling tube. The sample storage structure has a storage cavity, and the storage cavity is used to store battery powder. Among them, the sampling tube and the negative pressure structure are both detachably connected to the sample storage structure, and the sample storage structure also includes a first opening, a second opening, a first switch component and a second switch component, and the first opening and the second opening are both connected to the storage cavity, the first opening is connected to the sampling tube, and the second opening is connected to the negative pressure structure, the first switch component is used to open or close the first opening, and the second switch component is used to open or close the second opening, and the negative pressure structure is used to put the storage cavity and the sampling tube in a negative pressure state through the second opening. The present application can improve the accuracy of battery powder detection results.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more particularly, to a sampling device and a battery production system. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] During the production process of battery cells, it is necessary to sample and test the powder required for making electrode assemblies. How to improve the accuracy of battery powder test results is a research direction in battery technology. Utility Model Content

[0004] The present application provides a sampling device and a battery production system, which can improve the accuracy of battery powder detection results.

[0005] The embodiment of the present application provides a sampling device for sampling battery powder, and the sampling device includes a sampling tube, a sample storage structure and a negative pressure structure. The sampling tube is provided with a sampling port. The sample storage structure has a storage cavity, and the storage cavity is used to store battery powder. Among them, the sampling tube and the negative pressure structure are both detachably connected to the sample storage structure, and the sample storage structure also includes a first opening, a second opening, a first switch member and a second switch member. The first opening and the second opening are both connected to the storage cavity, the first opening is connected to the sampling tube, and the second opening is connected to the negative pressure structure. The first switch member is used to open or close the first opening, and the second switch member is used to open or close the second opening. The negative pressure structure is used to put the storage cavity and the sampling tube in a negative pressure state through the second opening.

[0006] In the above technical scheme, the sampling device of the embodiment of the present application sets a detachable sample storage structure between the sampling tube and the negative pressure structure, and uses the sample storage structure to store and transport battery powder, that is, the storage is completed during the sampling process, and then the first switch component and the second switch component are used to seal and disassemble the sample storage structure for detection. In this way, the contamination of the battery powder by air can be reduced, and the accuracy of the battery powder detection results can be improved.

[0007] In some embodiments, the sample storage structure also includes a weighing piece, which is arranged below the bottom wall of the storage cavity. The weighing piece is connected to the bottom wall of the storage cavity and is used to measure the mass of the battery powder in the storage cavity.

[0008] In the above technical solution, a weighing device is arranged on the bottom wall of the storage cavity. In this way, the operator can know the mass of the battery powder stored in the sample storage structure, which is convenient for operation. For example, when the mass of the battery powder in the sample storage structure is sufficient, the first opening and the second opening are closed respectively by using the first switch member and the second switch member to reduce the waste of battery powder.

[0009] In some embodiments, the sample storage structure also includes a controller, and the first switch element, the second switch element and the weighing element are all electrically connected to the controller. The controller is configured to control the first switch element to close the first opening and the second switch element to close the second opening when the mass of the battery powder measured by the weighing element reaches a preset mass.

[0010] In the above technical solution, the first opening and the second opening can be closed in time after the battery powder reaches the preset weight, reducing the waste of battery powder and manpower. Moreover, the negative pressure environment in the storage chamber can be better maintained to reduce the pollution of the battery powder by air.

[0011] In some embodiments, the sample storage structure also includes a display, which is connected to the weighing piece and is used to display the mass of the battery powder.

[0012] In the above technical solution, it is convenient for operators to observe the quality of the battery powder entering the storage cavity in real time.

[0013] In some embodiments, the sampling tube includes a first tube body and a tube head disposed at one end of the first tube body, the first tube body is provided with a sampling port, and along the direction from the first tube body to the tube head, the cross-sectional area of ​​at least part of the tube head gradually decreases.

[0014] In the above technical solution, the sampling tube can be easily inserted into the battery powder, reducing the entry resistance.

[0015] In some embodiments, there are multiple sampling ports, and at least some of the sampling ports are located at different heights of the sampling tube.

[0016] In the above technical solution, sampling of battery powder at different depths can be achieved, reducing the distortion of measurement results caused by inconsistent levels of the upper, middle and lower layers of the powder.

[0017] In some embodiments, the sampling device further comprises a blocking member, which is used to block at least one sampling port.

[0018] In the above technical solution, a blocking piece is provided to selectively close the sampling port, thereby realizing the opening and closing of the sampling port at different heights according to usage requirements, thereby improving the convenience of using the sampling device.

[0019] In some embodiments, the sampling device also includes a stirring tube, which is connected between the sampling tube and the sample storage structure. The stirring tube includes a second tube body, a driving member and a stirring member. At least part of the stirring member is located in the second tube body and extends along the extension direction of the second tube body. The driving member is connected to the second tube body and is used to drive the stirring member to rotate.

[0020] In the above technical solution, a stirring tube is arranged between the sampling tube and the sample storage structure, and the battery powder is stirred by the stirring tube, thereby reducing the problem of distorted measurement results caused by inconsistent levels of battery powder in the upper, middle and lower layers.

[0021] In some embodiments, the stirring member includes a rod body and a stirring portion, and the stirring portion is spirally disposed around the rod body.

[0022] In the above technical solution, the stirring part is set in a spiral winding form, which can improve the stirring effect of the stirring part and further reduce the problem of inconsistent levels of battery powder in the upper, middle and lower layers causing distortion of measurement results.

[0023] In some embodiments, the stirring tube and the sampling tube are detachably connected.

[0024] In the above technical solution, the sampling tube can be replaced according to the specific usage scenario, for example, sampling tubes of different lengths can be replaced for battery powder packages of different heights.

[0025] In some embodiments, the sampling device also includes a connecting tube, which includes a first tube segment and a second tube segment. The first tube segment and the second tube segment are arranged at an angle and connected. The first tube segment is connected to the stirring tube, and the second tube segment is connected to the sample storage structure.

[0026] In the above technical solution, since the connecting pipe has an angle, the feed port of the sample storage structure can be located on the side rather than the bottom, making it convenient for the bottom of the sample storage structure to carry the battery powder.

[0027] In some embodiments, the second tube segment further includes a guide portion for facing the battery powder, and the guide portion is inclined from the tube wall of the second tube segment toward the first opening.

[0028] In the above technical solution, a guide portion is provided to guide the battery powder into the sample storage structure to reduce the residue in the connecting tube.

[0029] In some embodiments, the sampling device further includes a cleaning structure, wherein the cleaning structure has a liquid storage chamber and a water inlet pipe connected to the liquid storage chamber, and the liquid storage chamber is connected between the second opening and the negative pressure structure.

[0030] In the above technical solution, a cleaning structure is provided to clean the sample storage structure, the sampling tube and other parts that have been in contact with the battery powder, thereby reducing the risk of the battery powder being contaminated by objects such as the powder retained last time.

[0031] In some embodiments, the cleaning structure has a third opening and a third switch element, the third opening is connected to the liquid storage chamber, the liquid storage chamber is connected to the negative pressure structure through the third opening, and the third switch element is used to open or close the third opening.

[0032] In the above technical solution, a third switch member is provided, and during cleaning, the third switch member closes the third opening, thereby reducing the flow of cleaning liquid to the negative pressure structure.

[0033] In some embodiments, the negative pressure structure includes a negative pressure chamber and a negative pressure providing member, the negative pressure chamber is connected to the liquid storage chamber, and the negative pressure providing member is connected to the negative pressure chamber.

[0034] In the above technical solution, a relatively stable negative pressure is formed by providing a negative pressure chamber, and the possibility of the cleaning liquid in the liquid storage chamber entering the negative pressure structure can be further reduced.

[0035] In some embodiments, at least a portion of the wall surface of the sampling device for contacting the battery powder is provided with an anti-adhesion layer.

[0036] In the above technical solution, an anti-adhesion layer is provided to reduce the residual battery powder during negative pressure sampling and reduce the waste of battery powder.

[0037] In some embodiments, at least a portion of the outer surface of the sampling tube is provided with a smooth layer.

[0038] In the above technical solution, it is convenient for the sampling tube to easily enter the battery powder.

[0039] In a second aspect, an embodiment of the present application further provides a battery production system, comprising the above-mentioned sampling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a battery production system provided in some embodiments of the present application;

[0042] Figure 2 A schematic diagram of the structure of a sampling device provided in some embodiments of the present application;

[0043] Figure 3 Another schematic diagram of the structure of the sampling device provided in some embodiments of the present application;

[0044] Figure 4A schematic diagram of a sample storage structure in a sampling device provided in some embodiments of the present application;

[0045] Figure 5 A schematic diagram of a portion of the structure of a sample storage structure in a sampling device provided in some embodiments of the present application;

[0046] Figure 6 Another structural schematic diagram of a sample storage structure in a sampling device provided in some embodiments of the present application;

[0047] Figure 7 A schematic diagram of the structure of a sampling tube in a sampling device provided in some embodiments of the present application;

[0048] Figure 8 Another schematic diagram of the structure of a sampling tube in a sampling device provided in some embodiments of the present application;

[0049] Fig. 9 A schematic diagram of a portion of the structure of a stirring tube in a sampling device provided in some embodiments of the present application;

[0050] Fig.10 A schematic structural diagram of a stirring member of a stirring tube in a sampling device provided in some embodiments of the present application.

[0051] The reference numerals of the specific embodiments are as follows:

[0052] 100. Battery production system; 200. Sampling device; 300. Testing device;

[0053] 1. Sampling tube; 11. Sampling port; 12. First tube body; 13. Tube head; 14. Blocking piece;

[0054] 2. Sample storage structure; 21. Storage cavity; 22. First opening; 23. Second opening; 24. First switch element; 25. Second switch element; 26. Weighing element; 27. Controller; 28. Display; 29. ​​Bottom wall of the storage cavity;

[0055] 3. Negative pressure structure; 31. Negative pressure chamber; 32. Negative pressure providing component;

[0056] 4. stirring tube; 41. second tube body; 42. driving member; 43. stirring member; 431. rod body; 432. stirring part;

[0057] 5. connecting pipe; 51. first pipe section; 52. second pipe section; 53. guide part;

[0058] 6. Cleaning structure; 61. Liquid storage chamber; 62. Water inlet pipe. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0061] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0062] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0065] The term “plurality” used in this application refers to two or more (including two).

[0066] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0067] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0068] The raw materials used in the production of battery cells (such as lithium iron phosphate, ternary powder, and graphite) are all in the form of powders, which need to be sampled and tested before use, such as testing parameters such as moisture content and particle size. When sampling, the powder is usually taken out using a sampling tube and placed in a special bag, which is then sent for testing.

[0069] In this process, when the powder is transferred from the sampling tube to the special bag and when the special bag is sealed, the powder is very likely to be contaminated by moisture, oxygen and magnetic substances in the air, thus affecting the test results.

[0070] In view of this, the present application provides a sampling device, which arranges a detachable sample storage structure between the sampling tube and the negative pressure structure, and uses the sample storage structure to store and transport battery powder. That is, the storage is completed during the sampling process, and then the sample storage structure is sealed and disassembled for testing. In this way, the contamination of the battery powder by air can be reduced and the accuracy of the test results can be improved.

[0071] Figure 1 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0072] like Figure 1 As shown, the battery production system 100 includes a sampling device 200, which is used for sampling battery powder.

[0073] Exemplarily, the battery production system 100 further includes a detection device 300, which is used to detect the particle size and moisture content of the battery powder.

[0074] Optionally, the detection device 300 includes a Karl Fischer tester and a laser particle size tester.

[0075] Figure 2 A schematic diagram of the structure of a sampling device provided in some embodiments of the present application, Figure 3 Another schematic diagram of the structure of the sampling device provided in some embodiments of the present application.

[0076] like Figure 2 and Figure 3 As shown, the present application also provides a sampling device 200 for sampling battery powder, and the sampling device 200 includes a sampling tube 1, a sample storage structure 2 and a negative pressure structure 3. The sampling tube 1 is provided with a sampling port 11. The sample storage structure 2 has a storage cavity 21, and the storage cavity 21 is used to store battery powder. Among them, the sampling tube 1 and the negative pressure structure 3 are both detachably connected to the sample storage structure 2, and the sample storage structure 2 also includes a first opening 22, a second opening 23, a first switch 24 and a second switch 25. The first opening 22 and the second opening 23 are both connected to the storage cavity 21. The first opening 22 is connected to the sampling tube 1, and the second opening 23 is connected to the negative pressure structure 3. The first switch 24 is used to open or close the first opening 22, and the second switch 25 is used to open or close the second opening 23. The negative pressure structure 3 is used to make the storage cavity 21 and the sampling tube 1 in a negative pressure state through the second opening 23.

[0077] The number of the sampling ports 11 in the embodiment of the present application may be one or more, and the plurality of sampling ports 11 may be arranged at intervals along the circumferential direction of the sampling tube 1 .

[0078] The storage chamber 21 of the embodiment of the present application may be directly connected to the sampling tube 1 or may be indirectly connected through other components.

[0079] The negative pressure structure 3 in the embodiment of the present application may be a mechanism capable of providing negative pressure, such as a vacuum pump or a jet pump.

[0080] The sampling tube 1 and the negative pressure structure 3 of the embodiment of the present application are both detachably connected to the sample storage structure 2. The sampling tube 1 can be directly detachably connected to the sample storage structure 2, or the sampling tube 1 can be connected to other components, and other components are detachably connected to the sample storage structure 2, or other detachably connected situations are used. Similarly, the negative pressure structure 3 can be directly detachably connected to the sample storage structure 2, and the negative pressure structure 3 can be connected to other components, and other components are detachably connected to the sample storage structure 2, or other detachably connected situations are used.

[0081] Specifically, the detachable connection refers to a connection method that can be repeatedly installed and removed, such as a threaded connection or a snap connection or other methods. Among them, the snap connection can be achieved by a snap buckle and a snap groove.

[0082] Exemplarily, the first opening 22 and the second opening 23 are located on opposite sides of the storage cavity 21 .

[0083] The first switch element 24 and the second switch element 25 of the embodiment of the present application can be solenoid valves; they can also be manual switches, such as plug plates. The sample storage structure 2 is also provided with a slot at the first opening 22 or the second opening 23. The first opening 22 or the second opening 23 can be closed by inserting the plug plate into the slot.

[0084] The sample storage structure 2 of the embodiment of the present application may be made of fluorinated materials to facilitate it being in a negative pressure state.

[0085] When the sampling device 200 of the embodiment of the present application is in use, the sampling tube 1 is inserted into the battery powder, and the battery powder is sucked into the storage cavity 21 through the sampling port 11 by using negative pressure. Then the first switch member 24 closes the first opening 22, and the second switch member 25 closes the second opening 23. The sample storage structure 2 is then removed from the other parts of the sampling device 200 and transported to the detection position.

[0086] The sampling device 200 of the embodiment of the present application sets a detachable sample storage structure 2 between the sampling tube 1 and the negative pressure structure 3, and uses the sample storage structure 2 to store and transport battery powder, that is, the storage is completed during the sampling process, and then the first switch component 24 and the second switch component 25 are used to seal and disassemble the sample storage structure 2 for detection. In this way, the contamination of the battery powder by air can be reduced, and the accuracy of the battery powder detection results can be improved.

[0087] Figure 4 A schematic structural diagram of a sample storage structure in a sampling device provided in some embodiments of the present application.

[0088] See also Figure 4In some embodiments, the sample storage structure 2 also includes a weighing piece 26, which is disposed below the bottom wall 29 of the storage cavity. The weighing piece 26 is connected to the bottom wall 29 of the storage cavity and is used to measure the mass of the battery powder in the storage cavity 21.

[0089] The weighing element 26 in the embodiment of the present application may be a weight sensor, or a pressure sensor or other component capable of measuring the mass of battery powder.

[0090] By setting a weighing element 26 on the bottom wall 29 of the storage cavity, the operator can know the mass of the battery powder stored in the sample storage structure 2, which facilitates the operation. For example, when the mass of the battery powder in the sample storage structure 2 is sufficient, the first opening 22 and the second opening 23 are closed respectively by using the first switch element 24 and the second switch element 25 to reduce the waste of battery powder.

[0091] Figure 5 A partial structural schematic diagram of a sample storage structure in a sampling device provided in some embodiments of the present application.

[0092] See also Figure 5 In some embodiments, the sample storage structure 2 also includes a controller 27, and the first switch element 24, the second switch element 25 and the weighing element 26 are all electrically connected to the controller 27. The controller 27 is configured to control the first switch element 24 to close the first opening 22 and the second switch element 25 to close the second opening 23 when the mass of the battery powder measured by the weighing element 26 reaches a preset mass.

[0093] The first switch element 24 and the second switch element 25 in the embodiment of the present application are both electric switches, for example, they can be solenoid valves, electric valves, electric ball valves, etc.

[0094] The preset quality of the embodiment of the present application depends on the actual application scenario.

[0095] With this arrangement, the first opening 22 and the second opening 23 can be closed in time after the battery powder reaches a preset weight, reducing the waste of battery powder and manpower. Moreover, the negative pressure environment in the storage chamber 21 can be better maintained, reducing the pollution of the battery powder by air.

[0096] Figure 6 Another structural schematic diagram of the sample storage structure in the sampling device provided in some embodiments of the present application.

[0097] See also Figure 6 In some embodiments, the sample storage structure 2 further includes a display 28, which is connected to the weighing element 26 and is used to display the mass of the battery powder.

[0098] The display 28 of the embodiment of the present application can be arranged on the side wall of the sample storage structure 2, or on the top wall of the sample storage structure 2, or at other locations.

[0099] A display 28 is provided to facilitate operators to observe the quality of the battery powder entering the storage cavity 21 in real time.

[0100] Optionally, the display 28 is integrated with the controller 27 so that an operator can operate the controller 27 , such as adjusting a preset quality, etc., and the operation is displayed on the display 28 . Figure 7 A schematic diagram of the structure of a sampling tube in a sampling device provided in some embodiments of the present application.

[0101] See also Figure 7 In some embodiments, the sampling tube 1 includes a first tube body 12 and a tube head 13 arranged at one end of the first tube body 12. The first tube body 12 is provided with a sampling port 11. Along the direction from the first tube body 12 to the tube head 13, the cross-sectional area of ​​at least part of the tube head 13 gradually decreases.

[0102] At least part of the tube head 13 in the embodiment of the present application refers to at least a portion of the tube head 13 in the direction from the first tube body 12 to the tube head 13 .

[0103] The pipe head 13 of the embodiment of the present application may be in a cone shape, a truncated cone shape or other shapes.

[0104] Such arrangement can facilitate the insertion of the sampling tube 1 into the battery powder and reduce the entry resistance.

[0105] In some embodiments, there are multiple sampling ports 11 , and at least some of the sampling ports 11 are located at different heights of the sampling tube 1 .

[0106] The multiple sampling ports 11 of the embodiment of the present application can be arranged along the extension direction of the first tube body 12, or can be arranged in a spiral arrangement at intervals on the first tube body 12, or in other situations. The different heights of the sampling tube 1 refer to different positions in the extension direction, and the sampling ports 11 at different positions in the extension direction extend into the battery powder to different depths.

[0107] This arrangement can achieve sampling of battery powder at different depths and reduce the distortion of measurement results caused by inconsistent levels of the upper, middle and lower layers of the powder.

[0108] Figure 8 Another schematic diagram of the structure of the sampling tube in the sampling device provided in some embodiments of the present application.

[0109] See also Figure 8 In some embodiments, the sampling device 200 further includes a blocking member 14 , and the blocking member 14 is used to block at least one sampling port 11 .

[0110] One blocking member 14 in the embodiment of the present application can block one sampling port 11 or simultaneously block multiple sampling ports 11. The sampling device 200 can include one blocking member 14 or multiple blocking members 14.

[0111] The blocking member 14 in the embodiment of the present application may be an adhesive sheet, and the adhesive sheet is attached to the sampling port 11 to seal the sampling port 11 .

[0112] The blocking member 14 in the embodiment of the present application may be an automatic switch member such as a solenoid valve, and each blocking member 14 enables one or more sampling ports 11 to be opened or closed.

[0113] The blocking member 14 can be provided to selectively close the sampling port 11 , so that the sampling port 11 at different heights can be opened and closed according to usage requirements, thereby improving the convenience of using the sampling device 200 .

[0114] Fig. 9 A partial structural schematic diagram of a stirring tube in a sampling device provided in some embodiments of the present application.

[0115] See also Figure 2 , Figure 3 and Fig. 9 In some embodiments, the sampling device 200 also includes a stirring tube 4, which is connected between the sampling tube 1 and the sample storage structure 2. The stirring tube 4 includes a second tube body 41, a driving member 42 and a stirring member 43. At least part of the stirring member 43 is located in the second tube body 41 and extends along the extension direction of the second tube body 41. The driving member 42 is connected to the second tube body 41 and is used to drive the stirring member 43 to rotate.

[0116] The driving member 42 of the embodiment of the present application can be a motor or other mechanism capable of driving the stirring tube 4 to rotate. The driving member 42 can be located inside the second tube body 41 or outside the second tube body 41. The stirring member 43 can be located entirely inside the second tube body 41 or partially extend outside the second tube body 41, for example, extend into the sampling tube 1.

[0117] The stirring member 43 in the embodiment of the present application may include a rod body and a plurality of stirring support rods, wherein the plurality of stirring support rods are arranged at intervals along the length direction of the rod body, and the stirring support rods and the rod body form an angle of, for example, 90°.

[0118] Optionally, the stirring member 43 is entirely located inside the second tube body 41 .

[0119] The stirring tube 4 of the embodiment of the present application can be integrally formed with the sampling tube 1, or can be separately arranged and connected, for example, by using a connecting ring, and the stirring tube 4 and the sampling tube 1 are respectively threadedly connected or interference fit with the connecting ring.

[0120] By arranging a stirring tube 4 between the sampling tube 1 and the sample storage structure 2, the battery powder is stirred by the stirring tube 4, thereby reducing the problem of distorted measurement results caused by inconsistent levels of battery powder in the upper, middle and lower layers.

[0121] Fig.10 A schematic structural diagram of a stirring member of a stirring tube in a sampling device provided in some embodiments of the present application.

[0122] See also Fig.10 In some embodiments, the stirring member 43 includes a rod body 431 and a stirring portion 432 , and the stirring portion 432 is spirally wrapped around the rod body 431 .

[0123] The stirring portion 432 of the embodiment of the present application is continuous and connected to the rod body 431 in a spiral manner.

[0124] The stirring portion 432 is configured in a spiral form, which can improve the stirring effect of the stirring portion 432 and further reduce the problem of inconsistent levels of battery powder in the upper, middle and lower layers causing distortion of the measurement results.

[0125] In some embodiments, the stirring tube 4 and the sampling tube 1 are detachably connected.

[0126] The detachable connection in the embodiment of the present application means that the stirring tube 4 and the sampling tube 1 can be repeatedly detached and installed. For example, the two can be directly connected in the form of threaded connection or plug-in matching, or the detachable connection can be achieved through other components.

[0127] The stirring tube 4 and the sampling tube 1 are configured to be detachably connected, so that the sampling tube 1 can be replaced according to the specific usage scenario, for example, sampling tubes 1 of different lengths can be replaced for battery powder packages of different heights.

[0128] Please continue reading Figure 2 and Figure 3 In some embodiments, the sampling device 200 also includes a connecting tube 5, which includes a first tube segment 51 and a second tube segment 52. The first tube segment 51 and the second tube segment 52 are arranged at an angle and connected. The first tube segment 51 is connected to the stirring tube 4, and the second tube segment 52 is connected to the sample storage structure 2.

[0129] The first pipe section 51 and the second pipe section 52 of the embodiment of the present application can be arranged at an acute angle, an obtuse angle or a right angle. Optionally, the first pipe section 51 and the second pipe section 52 are arranged vertically.

[0130] The first pipe section 51 and the stirring pipe 4 in the embodiment of the present application can be integrally formed, or can be separately provided and connected, for example, the two are threadedly connected or indirectly connected by other connecting components.

[0131] The second pipe section 52 and the sample storage structure 2 of the embodiment of the present application can be detachably connected by means of threaded connection or snap connection.

[0132] A connecting pipe 5 is provided. Since the connecting pipe 5 has an angle, the feed port of the sample storage structure 2 can be located on the side rather than the bottom, so that the bottom of the sample storage structure 2 can be conveniently loaded with battery powder.

[0133] In some embodiments, the second tube segment 52 further includes a guide portion 53 for facing the battery powder, and the guide portion 53 is inclined from the tube wall of the second tube segment 52 toward the first opening 22 .

[0134] The guide portion 53 of the embodiment of the present application is in direct contact with the battery powder. The surface of the guide portion 53 facing the battery powder can be an inclined plane or a curved surface.

[0135] The guide portion 53 of the embodiment of the present application may or may not be offset against the portion of the sample storage structure 2 surrounding the first opening 22 .

[0136] A guide portion 53 is provided to guide the battery powder into the sample storage structure 2 to reduce the residue in the connecting tube 5 .

[0137] In some embodiments, the sampling device 200 further includes a cleaning structure 6 , which has a liquid storage chamber 61 and a water inlet pipe 62 connected to the liquid storage chamber 61 , and the liquid storage chamber 61 is connected between the second opening 23 and the negative pressure structure 3 .

[0138] Exemplarily, two opposite sides of the liquid storage chamber 61 are respectively connected to the second opening 23 and the negative pressure structure 3 .

[0139] The cleaning structure 6 and the sample storage structure 2 of the embodiment of the present application can be detachably connected by means of threaded connection or snap connection.

[0140] A cleaning structure 6 is provided to clean the sample storage structure 2 and the sampling tube 1 and other parts that have been in contact with the battery powder, thereby reducing the risk of the battery powder being contaminated by objects such as powder retained from the previous time.

[0141] In some embodiments, the cleaning structure 6 has a third opening and a third switch. The third opening is connected to the liquid storage chamber 61. The liquid storage chamber 61 is connected to the negative pressure structure 3 through the third opening. The third switch is used to open or close the third opening.

[0142] The third switch element in the embodiment of the present application may be a solenoid valve, an electric valve, or an electric ball valve.

[0143] A third switch member is provided to close the third opening during cleaning, thereby reducing the flow of cleaning liquid to the negative pressure structure 3 .

[0144] In some embodiments, the negative pressure structure 3 includes a negative pressure chamber 31 and a negative pressure providing member 32 . The negative pressure chamber 31 is connected to the liquid storage chamber 61 , and the negative pressure providing member 32 is connected to the negative pressure chamber 31 .

[0145] The negative pressure providing member 32 of the embodiment of the present application provides negative pressure to the negative pressure chamber 31 through its own pipeline.

[0146] By providing the negative pressure chamber 31 , a relatively stable negative pressure is formed, and the possibility of the cleaning liquid in the liquid storage chamber 61 entering the negative pressure structure 3 can be further reduced.

[0147] Optionally, a partition net is provided in the negative pressure chamber 31 , and the entire outer edge of the partition net is connected to the cavity wall of the negative pressure chamber 31 , and the partition net is used to prevent battery powder from entering the negative pressure structure 3 .

[0148] In some embodiments, at least a portion of the wall surface of the sampling device 200 that contacts the battery powder is provided with an anti-adhesion layer.

[0149] Exemplarily, at least a portion of the tube wall of the sampling tube 1 , the tube wall of the stirring tube 4 , the tube wall of the connecting tube 5 , and the inner surface of the sample storage structure 2 is provided with an anti-adhesion layer.

[0150] The anti-adhesion layer in the embodiment of the present application may be a silane coating, a polytetrafluoroethylene coating, or a polyvinyl acetate coating.

[0151] Providing an anti-adhesion layer can reduce the residue of battery powder during negative pressure sampling and reduce the waste of battery powder.

[0152] In some embodiments, at least a portion of the outer surface of the sampling tube 1 is provided with a smooth layer.

[0153] The smooth layer in the embodiment of the present application is made of a smooth and low-resistance material, such as a polytetrafluoroethylene (PTFE) coating, a polyethylene coating, or a polymethyl methacrylate (PMMA) coating.

[0154] A smooth layer is provided to facilitate the sampling tube 1 to easily enter the battery powder.

[0155] The embodiment of the present application further provides a battery production system 100 , including the above-mentioned sampling device 200 .

[0156] See also Figure 2-Figure 10The embodiment of the present application provides a sampling device 200 for sampling battery powder. The sampling device 200 includes a sampling tube 1, a sample storage structure 2 and a negative pressure structure 3. The sampling tube 1 is provided with a sampling port 11. The sample storage structure 2 has a storage cavity 21, and the storage cavity 21 is used to store battery powder. Among them, the sampling tube 1 and the negative pressure structure 3 are both detachably connected to the sample storage structure 2. The sample storage structure 2 also includes a first opening 22, a second opening 23, a first switch 24 and a second switch 25. The first opening 22 and the second opening 23 are both connected to the storage cavity 21. The first opening 22 is connected to the sampling tube 1, and the second opening 23 is connected to the negative pressure structure 3. The first switch 24 is used to open or close the first opening 22, and the second switch 25 is used to open or close the second opening 23. The negative pressure structure 3 is used to put the storage cavity 21 and the sampling tube 1 in a negative pressure state through the second opening 23. The sample storage structure 2 further includes a weighing element 26, which is disposed below the bottom wall 29 of the storage cavity. The weighing element 26 is connected to the bottom wall 29 of the storage cavity and is used to measure the mass of the battery powder in the storage cavity 21. The sample storage structure 2 further includes a controller 27, and the first switch element 24, the second switch element 25 and the weighing element 26 are all electrically connected to the controller 27. The controller 27 is configured to control the first switch element 24 to close the first opening 22 and the second switch element 25 to close the second opening 23 when the mass of the battery powder measured by the weighing element 26 reaches a preset mass. The sample storage structure 2 further includes a display 28, which is connected to the weighing element 26 and is used to display the mass of the battery powder. The sampling tube 1 includes a first tube body 12 and a tube head 13 disposed at one end of the first tube body 12. The first tube body 12 is provided with a sampling port 11. Along the direction from the first tube body 12 to the tube head 13, the cross-sectional area of ​​at least part of the tube head 13 gradually decreases. The number of sampling ports 11 is multiple, and at least some of the sampling ports 11 are located at different heights of the sampling tube 1. The sampling device 200 also includes a stirring tube 4, which is connected between the sampling tube 1 and the sample storage structure 2. The stirring tube 4 includes a second tube body 41, a driving member 42 and a stirring member 43. At least part of the stirring member 43 is located in the second tube body 41 and extends along the extension direction of the second tube body 41. The driving member 42 is connected to the second tube body 41 and is used to drive the stirring member 43 to rotate. The sampling device 200 also includes a cleaning structure 6, which has a liquid storage chamber 61 and a water inlet pipe 62 connected to the liquid storage chamber 61. The liquid storage chamber 61 is connected between the second opening 23 and the negative pressure structure 3.

[0157] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sampling device for sampling battery powder, characterized in that: include: A sampling tube, wherein the sampling tube is provided with a sampling port; A sample storage structure, comprising a storage cavity, wherein the storage cavity is used to store the battery powder; Negative pressure structure; In which, the sampling tube and the negative pressure structure are both detachably connected to the sample storage structure, and the sample storage structure also includes a first opening, a second opening, a first switch component and a second switch component, the first opening and the second opening are both connected to the storage cavity, the first opening is connected to the sampling tube, and the second opening is connected to the negative pressure structure, the first switch component is used to open or close the first opening, and the second switch component is used to open or close the second opening, and the negative pressure structure is used to put the storage cavity and the sampling tube in a negative pressure state through the second opening.

2. The sampling device according to claim 1, characterized in that: The sample storage structure also includes a weighing piece, which is arranged below the bottom wall of the storage cavity. The weighing piece is connected to the bottom wall of the storage cavity and is used to measure the mass of the battery powder in the storage cavity.

3. The sampling device according to claim 2, characterized in that: The sample storage structure also includes a controller, and the first switch element, the second switch element and the weighing element are all electrically connected to the controller. The controller is configured to control the first switch element to close the first opening and the second switch element to close the second opening when the mass of the battery powder measured by the weighing element reaches a preset mass.

4. The sampling device according to claim 2, characterized in that: The sample storage structure also includes a display, which is connected to the weighing piece and is used to display the mass of the battery powder.

5. The sampling device according to any one of claims 1 to 4, characterized in that: The sampling tube includes a first tube body and a tube head arranged at one end of the first tube body. The first tube body is provided with the sampling port. Along the direction from the first tube body to the tube head, the cross-sectional area of ​​at least part of the tube head gradually decreases.

6. The sampling device according to claim 5, characterized in that: There are multiple sampling ports, and at least some of the sampling ports are located at different heights of the sampling tube.

7. The sampling device according to claim 6, characterized in that: The sampling device further comprises a blocking member, and the blocking member is used for blocking at least one of the sampling ports.

8. The sampling device according to any one of claims 1 to 4, characterized in that: The sampling device also includes a stirring tube, which is connected between the sampling tube and the sample storage structure. The stirring tube includes a second tube body, a driving member and a stirring member. At least a portion of the stirring member is located in the second tube body and extends along the extension direction of the second tube body. The driving member is connected to the second tube body and is used to drive the stirring member to rotate.

9. The sampling device according to claim 8, characterized in that: The stirring member comprises a rod body and a stirring portion, and the stirring portion is spirally arranged around the rod body.

10. The sampling device according to claim 8, characterized in that: The stirring tube and the sampling tube are detachably connected.

11. The sampling device according to claim 8, characterized in that: The sampling device also includes a connecting pipe, which includes a first pipe section and a second pipe section. The first pipe section and the second pipe section are arranged at an angle and connected. The first pipe section is connected to the stirring pipe, and the second pipe section is connected to the sample storage structure.

12. The sampling device according to claim 11, characterized in that: The second pipe section further includes a guide portion for facing the battery powder, and the guide portion is inclined from the pipe wall of the second pipe section toward the first opening.

13. The sampling device according to any one of claims 1 to 4, characterized in that: The sampling device further comprises a cleaning structure, wherein the cleaning structure comprises a liquid storage cavity and a water inlet pipe connected to the liquid storage cavity, and the liquid storage cavity is connected between the second opening and the negative pressure structure.

14. The sampling device according to claim 13, characterized in that: The cleaning structure has a third opening and a third switch element. The third opening is connected to the liquid storage chamber. The liquid storage chamber is connected to the negative pressure structure through the third opening. The third switch element is used to open or close the third opening.

15. The sampling device according to claim 13, characterized in that: The negative pressure structure comprises a negative pressure chamber and a negative pressure providing member, the negative pressure chamber is connected to the liquid storage chamber, and the negative pressure providing member is connected to the negative pressure chamber.

16. The sampling device according to claim 1, characterized in that At least a portion of the wall surface of the sampling device for contacting the battery powder is provided with an anti-adhesion layer.

17. The sampling device according to claim 1, characterized in that At least part of the outer surface of the sampling tube is provided with a smooth layer.

18. A battery production system, characterized in that: Comprising a sampling device as described in any one of claims 1-17.

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