Device for detecting moisture of lithium battery pole piece

Abstract

The utility model discloses a lithium battery pole piece moisture detection device, which comprises a shell and a moisture detector, the moisture detector is arranged at the top of the shell, at least one drying bottle is arranged at the top of the shell, a sealing cylinder corresponding to the drying bottle is arranged in the shell, and the moisture detector is arranged at the bottom of the shell. The drying bottles are connected with the corresponding sealing cylinders through air pipes, a reactor is installed in the shell, the sealing cylinders are connected with the reactor through guide pipes, a positive electrode and a negative electrode are arranged in the reactor, the positive electrode and the negative electrode are both connected with the moisture detector, and the moisture detector is connected with the shell. The lithium battery pole piece detection device is characterized in that a slidable placing plate is arranged in the shell, and a fixed seat corresponding to the sealing cylinder is arranged on the placing plate, so that a detected lithium battery pole piece can be separated from the bottom of the detection bottle, and dry gas is directly contacted with the front and back surfaces of the pole piece; the contact area is increased, the drying efficiency is improved, and drying is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a device for detecting moisture in lithium battery pole pieces. Background Art

[0002] At present, in the production and manufacturing process of lithium batteries, it is crucial to ensure that the moisture content of the electrode meets strict standards, because excessive moisture will directly affect the safety, capacity and cycle life of the battery. There are many lithium battery electrode moisture detection devices on the market. During the drying process of the electrode in the test bottle, due to the closed nature and design limitations of the test bottle, one side of the electrode often cannot directly and fully contact the drying gas, resulting in the drying speed of this side being significantly slower than the side directly exposed to the drying gas.

[0003] A search revealed a Chinese invention patent, publication number CN105911115A, which discloses a device and method for detecting moisture in lithium battery electrodes. The device utilizes a sampling station, an electronic scale, multiple test bottles, and a linkage system between a reactor and a tester within a glove box, allowing samples to be taken at multiple locations on the core using a punch to ensure sample uniformity and diversity. Multiple test bottles operate in parallel, directly measuring and calculating the average moisture content of electrodes at different locations on the core. This improves detection accuracy and efficiency, facilitating the adjustment and control of quality standards. However, the patent merely places the electrodes inside the test bottles during the drying process, preventing the bottom of the electrodes from properly contacting the drying gas. This results in a slow and uneven drying process, which can affect the detection results. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects in the prior art and provide a lithium battery electrode moisture detection device, which can separate the lithium battery electrode to be detected from the bottom of the detection bottle, so that the drying gas can directly contact the front and back sides of the electrode, increase the contact area, improve the drying efficiency and make the drying more uniform.

[0005] In order to solve the above technical problems, the technical solution of the utility model is a lithium battery electrode moisture detection device, including a shell and a moisture detector, the moisture detector is installed on the top of the shell, the top of the shell is provided with at least one drying bottle, the interior of the shell is provided with a sealing cylinder corresponding to the drying bottle, the drying bottle and the corresponding sealing cylinder are connected by an air pipe, a reactor is installed inside the shell, the sealing cylinder and the reactor are connected by a conduit, a positive electrode and a negative electrode are provided in the reactor, the positive electrode and the negative electrode are both in contact with the moisture The detector is connected, characterized in that: a slidable placement plate is provided inside the shell, and a fixing seat is provided on the placement plate and is arranged in a one-to-one correspondence with the sealing cylinder. The fixing seat is matched with the corresponding sealing cylinder, and a convex ring that can accelerate drying is fixedly connected to the inside of the fixing seat. The top of the convex ring is suitable for placing the lithium battery pole piece, and an axially penetrating cavity is provided below the lithium battery pole piece in the convex ring, and a plurality of vents are provided on the peripheral wall of the cavity. When the sealing cylinder is sealingly connected to the convex ring, the vent is suitable for connecting the cavity and the sealing cylinder to facilitate the circulation of drying gas.

[0006] Furthermore, a step is provided on the top of the convex ring, and the step is suitable for placing a lithium battery pole piece.

[0007] Furthermore, a sealing groove is provided inside the fixing seat, a sealing gasket is provided inside the sealing groove, and a clamping ring is fixedly connected to the bottom of the sealing cylinder, and the clamping ring cooperates with the sealing groove.

[0008] Furthermore, a hollow plate is fixedly connected to the outer peripheral surface of the sealing cylinder, and the interior of the hollow plate can allow the air pipe to pass through. One end of the hollow plate is connected to a connecting plate, and a cylinder is installed inside the outer shell. The cylinder is located directly below the connecting plate, and the output end of the cylinder is connected to the bottom of the connecting plate.

[0009] Furthermore, when the sealing cylinder is sealingly connected to the convex ring, the sealing cylinder has a lower section located below the lithium battery pole piece on the convex ring, and the air pipe is connected to the lower section of the sealing cylinder.

[0010] Furthermore, a slide rail is fixedly connected to the interior of the shell, the placement plate is slidably connected to the interior of the slide rail, a weighing device is installed on the placement plate, and one end of the placement plate is fixedly connected to a cover plate, which is located outside the shell.

[0011] Furthermore, a mounting plate is fixedly connected to the interior of the shell, a cleaning roller is rotatably installed between the mounting plate and the inner wall of the shell, two symmetrically arranged gears are fixedly sleeved on the cleaning roller, and two symmetrically arranged racks are fixedly connected to the placement plate, the gears are located above the corresponding racks, and the gears are meshed with the racks.

[0012] By adopting the above technical solution, the utility model has the following beneficial effects:

[0013] 1. The electrode can be fixed on the step by the setting of the convex ring. At the same time, the interior of the convex ring is hollow and can communicate with the interior of the sealing cylinder to directly contact the drying gas, thereby increasing the contact area and making the drying more uniform, thereby improving the drying efficiency and detection accuracy.

[0014] 2. The setting of the sealing groove can ensure that the internal dry gas will not leak after the fixing seat and the sealing cylinder are connected, thereby ensuring the detection efficiency.

[0015] 3. Through the setting of the cylinder, when testing is required, the sealing cylinder and the fixing seat can be directly connected by electronic control without manual operation.

[0016] 4. Through the setting of the sliding placement plate, when testing is required, you only need to place the electrode on the fixed seat and then push the placement plate into the interior of the equipment, which reduces human contact and avoids affecting the accuracy of the test.

[0017] 5. Through the setting of the cleaning roller, when placing the electrode, the dirtier side is placed on top. When the placement plate is pushed in, the rack will drive the rotation of the gear, thereby realizing the rotation of the cleaning roller. The surface of the cleaning roller is a flexible material, which can clean the surface of the electrode without damaging the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the left side of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model on the right side;

[0020] Figure 3 This is a schematic diagram of the internal structure of the shell of the utility model;

[0021] Figure 4 This is a schematic diagram of the pull-out structure of the placement plate of the utility model;

[0022] Figure 5 This is a schematic diagram of the sealing cylinder lifting structure of the utility model;

[0023] Figure 6 This is a schematic diagram of the overall structure of the fixing seat of the utility model;

[0024] Figure 7 This is a schematic diagram of the overall structure of the sealing cylinder of the present utility model.

[0025] In the figure: 1. Housing; 2. Moisture detector; 3. Cover; 4. Scale; 5. Slide rail; 6. Placement plate; 7. Rack; 8. Mounting plate; 9. Cleaning roller; 10. Gear; 11. Fixing seat; 12. Sealing cylinder; 13. Sealing groove; 14. Convex ring; 15. Vent; 16. Snap ring; 17. Hollow plate; 18. Connecting plate; 19. Cylinder; 20. Air pipe; 21. Drying bottle; 22. Conduit; 23. Reactor; 24. Positive electrode; 25. Negative electrode. DETAILED DESCRIPTION

[0026] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 As shown, a device for detecting moisture in a lithium battery electrode comprises a housing 1 and a moisture detector 2. The moisture detector 2 is mounted on the top of the housing 1. At least one drying bottle 21 is provided on the top of the housing 1. A sealing cylinder 12 corresponding to the drying bottle 21 is provided inside the housing 1. The drying bottle 21 and the corresponding sealing cylinder 12 are connected via an air pipe 20. A reactor 23 is mounted inside the housing 1. The sealing cylinder 12 and the reactor 23 are connected via a conduit 22. A positive electrode 24 and a negative electrode 25 are provided in the reactor 23. The positive electrode 24 and the negative electrode 25 are both connected to the moisture detector 2. The outer shell 1 is connected with a slidable placement plate 6, and the placement plate 6 is provided with a fixing seat 11 which is arranged in a one-to-one correspondence with the sealing cylinder 12. The fixing seat 11 is matched with the corresponding sealing cylinder 12. The interior of the fixing seat 11 is fixedly connected with a convex ring 14 which can accelerate drying. The top of the convex ring 14 is suitable for placing the lithium battery pole piece. The convex ring 14 is provided with an axially penetrating cavity below the lithium battery pole piece, and a plurality of vents 15 are provided on the peripheral wall of the cavity. When the sealing cylinder 12 is sealed and connected to the convex ring 14, the vent 15 is suitable for connecting the cavity and the sealing cylinder 12 to facilitate the circulation of drying gas.

[0029] like Figure 2 As shown, a step is provided on the top of the convex ring 14, and the step is suitable for placing the lithium battery pole piece.

[0030] In this embodiment, the reactor 23 contains a reaction reagent, which can undergo an electrolysis reaction with water to generate electricity, which is transferred to the moisture detector 2 through the positive electrode 24 and the negative electrode 25. The reaction reagent is a prior art, which refers to the reaction reagent disclosed in CN105911115A.

[0031] like Figure 1 As shown, a sealing groove 13 is provided inside the fixing seat 11 , a sealing gasket is provided inside the sealing groove 13 , and a snap ring 16 is fixedly connected to the bottom of the sealing cylinder 12 , and the snap ring 16 cooperates with the sealing groove 13 .

[0032] like Figure 1 As shown, a hollow plate 17 is fixedly connected to the outer peripheral surface of the sealing cylinder 12, and the interior of the hollow plate 17 can allow the air pipe 20 to pass through. One end of the hollow plate 17 is connected to a connecting plate 18, and a cylinder 19 is installed inside the outer shell 1. The cylinder 19 is located directly below the connecting plate 18, and the output end of the cylinder 19 is connected to the bottom of the connecting plate 18.

[0033] like Figure 1 As shown, when the sealing cylinder 12 is sealed and connected to the convex ring 14 , the sealing cylinder 12 has a lower section located below the lithium battery electrode on the convex ring 14 , and the air pipe 20 is connected to the lower section of the sealing cylinder 12 .

[0034] The working principle of the present invention is as follows: when detection is required, the entire process is to place the electrode on the fixing seat 11, and achieve sealing through the cooperation of the fixing seat 11 and the sealing cylinder 12, and pass the dry gas from the air pipe 20 directly into the interior of the sealing cylinder 12 through the drying cylinder to dry the electrode. After drying, the moisture enters the interior of the reactor 23 through the conduit 22 to react with the reagent to generate electricity through electrolysis, and finally transport it to the moisture detector 2 through the wire. This part is all existing technology and will not be described in detail here.

[0035] After placing the electrode on the convex ring 14, the cylinder 19 is started by the button on the outer shell 1. The cylinder 19 drives the connecting plate 18 to move downward, and the connecting plate 18 drives the hollow plate 17 and the sealing cylinder 12 to move. The retaining ring 16 at the bottom of the sealing cylinder 12 will be stuck in the inside of the sealing groove 13 and cooperate with the sealing gasket to achieve the sealing of the entire dry environment, which reduces the overall human intervention and sends the electrode into the sealed detection environment in an automated manner. At the same time, the sealing effect is improved, and the overall accuracy of the detection is improved.

[0036] When the electrode is placed on the convex ring 14, the limit is achieved by the step. Since the convex ring 14 is hollow and has a number of vents 15 that communicate with the inner cavity of the sealing tube 12, the front and back sides of the electrode can directly contact the drying gas, and the air pipe 20 is connected to the lower half of the sealing tube 12. The drying gas will first contact the back side of the electrode with a smaller contact area, which increases the contact area between the electrode and the drying gas. The drying rate on both sides is the same, the drying is faster and more comprehensive, and the detection speed is accelerated and the detection accuracy is improved.

[0037] Example 2

[0038] like Figure 1 As shown, this embodiment further includes the following structure on the basis of embodiment one: a slide rail 5 is fixedly connected to the inside of the shell 1, a placement plate 6 is slidably connected to the inside of the slide rail 5, a weighing device 4 is installed on the placement plate 6, and one end of the placement plate 6 is fixedly connected to a cover plate 3, and the cover plate 3 is located outside the shell 1.

[0039] like Figure 1 As shown, a mounting plate 8 is fixedly connected to the interior of the housing 1, and a cleaning roller 9 is rotatably installed between the mounting plate 8 and the inner wall of the housing 1. Two symmetrically arranged gears 10 are fixedly sleeved on the cleaning roller 9, and two symmetrically arranged racks 7 are fixedly connected to the placement plate 6. The gears 10 are located above the corresponding racks 7, and the gears 10 are meshed with the racks 7.

[0040] The working principle of the present invention is as follows: the placement plate 6 is pulled out of the interior of the shell 1, and the cut electrode is placed on the placement plate 6. Subsequent operations only require pushing the placement plate 6 into the interior of the shell 1. No excessive human intervention is required, which avoids contamination of the electrode and improves the degree of automation and detection accuracy.

[0041] When the placement plate 6 is pushed into the interior of the shell 1, it will drive the rack 7 to move, and the movement of the rack 7 will drive the rotation of the gear 10. The gear 10 will drive the cleaning roller 9 to rotate in the active process. The cleaning roller 9 cleans the top surface of the pole piece during the movement of the pole piece to prevent impurities on its surface from affecting the accuracy of the overall detection. It should be noted that the surface of the cleaning roller 9 is made of flexible material, which can achieve the cleaning effect but will not damage the surface of the pole piece. The cleaning roller 9 can only clean one side of the pole piece. Therefore, the dirtier side can be placed on the top surface, or the cleaning of both sides can be achieved by pulling and placing the plate 6 twice and replacing the front and back of the pole piece.

[0042] The weighing device 4 can be used to detect the weight of the lithium battery pole piece before removing the moisture. After removing the moisture, it can be weighed again. The comparison between the two can intuitively reflect the weight of the lithium battery pole piece originally containing moisture.

[0043] The above specific embodiments further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for detecting moisture in a lithium battery electrode, comprising a housing (1) and a moisture detector (2), wherein the moisture detector (2) is mounted on the top of the housing (1), at least one drying bottle (21) is provided on the top of the housing (1), a sealing cylinder (12) corresponding to the drying bottle (21) is provided inside the housing (1), the drying bottle (21) and the corresponding sealing cylinder (12) are connected via an air pipe (20), a reactor (23) is mounted inside the housing (1), the sealing cylinder (12) and the reactor (23) are connected via a conduit (22), a positive electrode (24) and a negative electrode (25) are provided in the reactor (23), and the positive electrode (24) and the negative electrode (25) are both connected to the moisture detector (2), characterized in that: A slidable placement plate (6) is provided inside the housing (1), and a fixing seat (11) corresponding to the sealing cylinder (12) is provided on the placement plate (6), and the fixing seat (11) is matched with the corresponding sealing cylinder (12). A convex ring (14) for accelerating drying is fixedly connected inside the fixing seat (11), and the top of the convex ring (14) is suitable for placing a lithium battery pole piece. An axially penetrating cavity is provided inside the convex ring (14) below the lithium battery pole piece, and a plurality of vents (15) are opened on the peripheral wall of the cavity. When the sealing cylinder (12) is sealed and connected to the convex ring (14), the vents (15) are suitable for connecting the cavity and the sealing cylinder (12) to facilitate the circulation of drying gas.

2. The lithium battery electrode moisture detection device according to claim 1, characterized in that: The top of the convex ring (14) is provided with a step, and the step is suitable for placing a lithium battery pole piece.

3. The lithium battery electrode moisture detection device according to claim 1, characterized in that: A sealing groove (13) is provided inside the fixing seat (11), a sealing gasket is provided inside the sealing groove (13), and a snap ring (16) is fixedly connected to the bottom of the sealing cylinder (12), and the snap ring (16) cooperates with the sealing groove (13).

4. The lithium battery electrode moisture detection device according to claim 1, characterized in that: A hollow plate (17) is fixedly connected to the outer peripheral surface of the sealing cylinder (12), and the interior of the hollow plate (17) allows the air pipe (20) to pass through. One end of the hollow plate (17) is connected to a connecting plate (18). A cylinder (19) is installed inside the housing (1), and the cylinder (19) is located directly below the connecting plate (18). The output end of the cylinder (19) is connected to the bottom of the connecting plate (18).

5. The lithium battery electrode moisture detection device according to claim 1, characterized in that: When the sealing cylinder (12) is sealed and connected to the convex ring (14), the sealing cylinder (12) has a lower section located below the lithium battery pole piece on the convex ring (14), and the air pipe (20) is connected to the lower section of the sealing cylinder (12).

6. The lithium battery electrode moisture detection device according to claim 1, characterized in that: The interior of the housing (1) is fixedly connected to a slide rail (5), the placement plate (6) is slidably connected to the interior of the slide rail (5), a weighing device (4) is mounted on the placement plate (6), one end of the placement plate (6) is fixedly connected to a cover plate (3), and the cover plate (3) is located outside the housing (1).

7. The lithium battery electrode moisture detection device according to claim 1, characterized in that: The interior of the housing (1) is fixedly connected to a mounting plate (8), a cleaning roller (9) is rotatably mounted between the mounting plate (8) and the inner wall of the housing (1), two symmetrically arranged gears (10) are fixedly sleeved on the cleaning roller (9), and two symmetrically arranged racks (7) are fixedly connected to the placement plate (6), the gears (10) are located above the corresponding racks (7), and the gears (10) are meshed with the racks (7).

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