Preparation device of sodium ion button cell negative electrode sodium sheet

Abstract

The utility model discloses a preparation device of a sodium ion button battery cathode sodium sheet, which relates to the technical field of battery preparation and comprises a base, a flattening mechanism used for flattening a sodium block and a rolling mechanism capable of preventing the sodium sheet from burring are arranged at the top of the base, and the rolling mechanism comprises two side plates symmetrically arranged at the top of the base. A fixed rotating roller is rotatably arranged between the side plates, a first motor is fixedly arranged on the side walls of the side plates, the output end of the first motor is in transmission connection with the end of the fixed rotating roller, a movable rotating roller is movably arranged between the side plates, and the movable rotating roller is arranged above the fixed rotating roller. The device is simple in structure and convenient to operate, uniform distribution of current in the battery is facilitated, the charging and discharging efficiency is improved, the cycle life is prolonged, the distance between the movable rotating roller and the fixed rotating roller is conveniently adjusted by arranging the adjustable movable rotating roller, the flexibility of the device is enhanced, and the rolling mechanism is beneficial to further flattening a sodium sheet, removing burrs on the surface and improving the quality of the sodium sheet.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a device for preparing sodium negative electrode sodium sheet for sodium-ion button batteries. Background Technology

[0002] Sodium-ion batteries are secondary batteries that store and release energy by using sodium ions to intercalate between the positive and negative electrodes. They have advantages such as abundant raw materials, low cost, and high safety, and are considered an important alternative technology for future new energy vehicles and energy storage.

[0003] In the early stages of research and development and production of sodium-ion battery materials, it is often necessary to measure the electrochemical performance by assembling button cells. Button cells have become the preferred testing method for initial battery research. A key objective of button cell research is to obtain reliable data on the performance of the battery and its components, enabling predictions of the materials' performance within a reasonable range. The main materials used in sodium-ion button cells include: sodium ion material, electrolyte, separator, button cell structural components, and sodium sheet; the sodium sheet, acting as the negative electrode in the sodium-ion button cell, stores and releases sodium ions from the positive electrode.

[0004] However, the production process of sodium-ion button batteries currently faces a series of problems that urgently need to be solved. Among them, the preparation of the sodium sheet is particularly critical. In traditional laboratory production, sodium sheets are first manually flattened from sodium blocks and then punched using a die, often resulting in uncontrollable thickness. This uneven thickness directly affects the battery's performance and stability. On the one hand, sodium sheets of different thicknesses lead to uneven current distribution inside the battery, thus affecting the battery's charge-discharge efficiency and cycle life; on the other hand, inconsistent thickness also makes battery assembly difficult, increasing production costs and complexity.

[0005] Furthermore, surface burrs can occur during the stamping process. These burrs not only affect the appearance quality of the sodium sheet, but more seriously, during battery assembly, they may puncture the separator, causing short circuits and other safety issues, significantly reducing the success rate of battery manufacturing. Simultaneously, surface burrs can also lead to poor contact between the sodium sheet and other battery components, affecting battery performance. Utility Model Content

[0006] The purpose of this invention is to provide a device for preparing sodium sheet negative electrode for sodium-ion button batteries, so as to solve the problem that the sodium sheet thickness is uneven during the production of sodium-ion button batteries, which easily leads to uneven current distribution inside the battery and affects the charging and discharging efficiency and cycle life of the battery.

[0007] An apparatus for preparing sodium sheet negative electrode for sodium-ion button batteries includes a base. The top of the base is provided with a flattening mechanism for flattening sodium blocks and a rolling mechanism for preventing burrs on the sodium sheet. The rolling mechanism includes two side plates symmetrically arranged on the top of the base. A fixed roller is rotatably arranged between the side plates. A first motor is fixedly arranged on the side wall of the side plate. The output end of the first motor is drivenly connected to the end of the fixed roller. A movable roller is movably arranged between the side plates and is located above the fixed roller. A conveyor belt is rotatably arranged between the side walls of the side plates. The rotation shaft of the conveyor belt is connected to the rotation shaft of the fixed roller by a belt.

[0008] Preferably, the side plate has a slot in its side wall, a lead screw is rotatably mounted in the slot on the side plate near the flattening mechanism, a connecting block is threaded onto the lead screw, a guide rod is fixedly mounted in the slot on the side plate away from the flattening mechanism, a guide block is slidably mounted on the guide rod, an adjusting block is fixedly mounted between the side wall of the guide block and the connecting block, the movable roller is rotatably mounted at the bottom of the adjusting block, a second motor is mounted on the top of the side plate, the output end of the second motor is drivenly connected to the end of the lead screw, and a fixing block is fixedly mounted between the side walls of the side plate.

[0009] Preferably, the flattening mechanism includes a placement platform located on top of the base, a placement groove on the top of the placement platform, a support frame on the side wall of the placement platform, a hydraulic rod on the top of the support frame, and a pressure plate fixedly attached to the output end of the hydraulic rod. The size of the pressure plate is adapted to the size of the placement groove.

[0010] Preferably, the side plate has scale lines on its side wall.

[0011] The advantages of this utility model are as follows: The sodium sheet preparation device for the negative electrode of sodium-ion button battery in this utility model, by setting a flattening mechanism, uses a pressure plate to flatten the sodium block, ensuring that the sodium block can be flattened evenly, which helps to evenly distribute the current inside the battery, improves the charging and discharging efficiency and cycle life. By setting an adjustable moving roller, it is easy to adjust the distance between the moving roller and the fixed roller, which can adapt to more needs and enhance the flexibility of the device. The rolling mechanism helps to further flatten the sodium sheet and remove surface burrs, improving the quality of the sodium sheet. Attached Figure Description

[0012] Figure 1 , 2 These are schematic diagrams of the structure of this utility model from different perspectives.

[0013] Figure 3 This is a schematic diagram of the structure of this utility model without the side panels installed.

[0014] Figure 4 The charge-discharge curves of sodium sheet button batteries prepared by conventional methods and those prepared by this device are compared.

[0015] Among them, 100 is the base; 200 is the flattening mechanism; 201 is the support frame; 202 is the placement platform; 203 is the placement groove; 204 is the hydraulic rod; 205 is the pressure plate; 300 is the roller pressing mechanism; 301 is the side plate; 302 is the first motor; 303 is the fixed roller; 304 is the moving roller; 305 is the fixing block; 306 is the adjusting block; 307 is the second motor; 308 is the slot; 309 is the belt; 310 is the conveyor belt; 311 is the guide rod; 312 is the guide block; 313 is the lead screw; and 314 is the connecting block. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] like Figures 1 to 4 As shown, an apparatus for preparing sodium sheet negative electrode for sodium-ion button batteries includes a base 100. The top of the base 100 is provided with a flattening mechanism 200 for flattening sodium blocks and a rolling mechanism 300 for preventing burrs on the sodium sheet. The rolling mechanism 300 includes two side plates 301 symmetrically arranged on the top of the base 100. A fixed roller 303 is rotatably arranged between the side plates 301. A first motor 302 is fixedly arranged on the side wall of the side plate 301. The output end of the first motor 302 is connected to the end of the fixed roller 303. A movable roller 304 is movably arranged between the side plates 301. The movable roller 304 is arranged above the fixed roller 303. A conveyor belt 310 is rotatably arranged between the side walls of the side plates 301. The rotation shaft of the conveyor belt 310 is connected to the rotation shaft of the fixed roller 303 by a belt 309.

[0018] The flattened sodium sheet is laid flat on one side using aluminum foil and on the other side using polyethylene film. The aluminum foil and polyethylene film reduce the contact between the sodium sheet surface and the outside environment, protecting the sodium sheet surface from oxidation. At the same time, the aluminum foil has high conductivity and corrosion resistance, and can also support and fix the sodium sheet. When the polyethylene film and aluminum foil are used together, the impact force on the sodium sheet can be reduced during cushioning, effectively preventing the formation of burrs. The distance between the moving roller 304 and the fixed roller 303 is adjusted, and the flattened sodium sheet is placed on the conveyor belt 310. The first motor 302 is started. Since the rotation shaft of the fixed roller 303 is connected to the rotation shaft of the conveyor belt 310 through the belt 309, the rotation of the fixed roller 303 will drive the conveyor belt 310 to rotate further, so that the flattened sodium sheet is fed between the two rollers, and then rolled together with the moving roller 304. The rolling process helps to further flatten the sodium sheet and remove surface burrs, improving the quality of the sodium sheet.

[0019] In this embodiment, the side plate 301 has a slot 308 on its side wall. A lead screw 313 is rotatably installed in the slot 308 on the side plate 301 near the flattening mechanism 200. A connecting block 314 is threaded onto the lead screw 313. A guide rod 311 is fixedly installed in the slot 308 on the side plate 301 away from the flattening mechanism 200. A guide block 312 is slidably installed on the guide rod 311. An adjusting block 306 is fixed between the side wall of the guide block 312 and the side wall of the connecting block 314. The movable roller 304 is rotatably installed at the bottom of the adjusting block 306. A second motor 307 is installed at the top of the side plate 301. The output end of the second motor 307 is connected to the end of the lead screw 313. A fixing block 305 is fixed between the side walls of the side plate 301.

[0020] According to the required thickness of the sodium sheet, the distance between the moving roller 304 and the fixed roller 303 is adjusted by starting the second motor 307. The second motor 307 drives the lead screw 313 to rotate, causing the connecting block 314 to move on the lead screw 313. Then, the moving roller 304 is moved up and down by the adjusting block 306. The guide rod 311 and the guide block 312 ensure the stable movement of the moving roller 304 and facilitate flexible settings according to different requirements.

[0021] In this embodiment, the flattening mechanism 200 includes a placement platform 202 located on the top of the base 100. The top of the placement platform 202 is provided with a placement groove 203. The side wall of the placement platform 202 is provided with a support frame 201. The top of the support frame 201 is provided with a hydraulic rod 204. The output end of the hydraulic rod 204 is fixedly provided with a pressure plate 205. The size of the pressure plate 205 is adapted to the size of the placement groove 203.

[0022] Place the sodium block in the placement slot 203 of the placement platform 202 on the top of the base 100, activate the hydraulic rod 204 on the top of the support frame 201, and lower the pressure plate 205 driven by its output end to flatten the sodium block. The size of the pressure plate 205 is adapted to the size of the placement slot 203 to ensure that the sodium block can be flattened evenly, thereby initially solving the problem of uneven sodium sheet thickness.

[0023] In this embodiment, the side wall of the side plate 301 is provided with scale lines.

[0024] The scale lines are set to help determine the distance the moving roller 304 moves, thereby enhancing the flexibility and convenience of the device.

[0025] Example 1:

[0026] The sodium block is placed in the flattening mechanism and flattened using the pressure plate 205;

[0027] The flattened sodium block is laid flat on one side using aluminum oxide foil and on the other side using polyethylene film.

[0028] Adjust the distance between the movable roller 304 and the fixed roller 303, and place the flat sodium sheet into the rolling mechanism for rolling.

[0029] A certain number of sodium tablets were punched using a punching machine with a diameter of 16mm and set aside for later use.

[0030] Sodium-ion cathode material is used, and after homogenization, coating, drying, and die-cutting, it is ready for use.

[0031] The polyethylene film was removed using plastic tweezers, and the sodium sheet and sodium electrode positive material were used to assemble the electrode. The consistency of the test data was then compared.

[0032] Comparative Example 1:

[0033] Use a sheet-like object to flatten the sodium block;

[0034] A certain number of sodium tablets were punched using a punching machine with a diameter of 16mm and set aside for later use.

[0035] Sodium-ion cathode material is used, and after homogenization, coating, drying, and die-cutting, it is ready for use.

[0036] The coin cell was assembled using sodium sheet and sodium-ion battery positive electrode material, and the consistency of the test data was compared.

[0037] The following is a comparison of test data for sodium-ion coin cells prepared by conventional methods and those prepared by this device.

[0038]

[0039] As shown in the table above, the success rate of button batteries made using the traditional method to prepare sodium sheets is 50%, and the range of discharge capacity within the same batch is 5.6 mAh / g, indicating poor consistency. In contrast, the success rate of button batteries made using this device to prepare sodium sheets is 100%, and the range of discharge capacity within the same batch is less than 1 mAh / g, indicating good consistency.

[0040] pass Figure 4 As can be seen, the charge-discharge curves of button batteries made using traditional methods to prepare sodium sheets exhibit fluctuations, with voltage showing sudden increases or decreases; while the charge-discharge curves of button batteries made using the sodium sheets prepared by this invention are smooth with no obvious voltage fluctuations.

[0041] In summary, the sodium sheet prepared by this device improves the stability of button cell manufacturing and enhances the consistency of button cell test data.

[0042] Working process and principle: When using this device, the sodium block is placed in the placement slot 203 of the placement platform 202 on the top of the base 100. Then, the hydraulic rod 204 on the top of the support frame 201 is activated, causing the pressure plate 205 driven by its output end to descend and flatten the sodium block, ensuring that the sodium block can be flattened evenly, thus initially solving the problem of uneven sodium sheet thickness. After flattening, the flattened sodium block is laid flat on one side with aluminum foil and on the other side with polyethylene film. The flattened sodium sheet is placed on the conveyor belt 310. According to the required thickness of the sodium sheet, the second motor 307 is activated. The second motor 307 drives the lead screw 313 to rotate, so that the connecting block 314 is on the lead screw 313. The moving roller 304 moves up and down via the adjusting block 306, adjusting the distance between the moving roller 304 and the fixed roller 303. After the distance between the moving roller 304 and the fixed roller 303 is adjusted, the first motor 302 is started. Since the rotating shaft of the fixed roller 303 is connected to the rotating shaft of the conveyor belt 310 via the belt 309, the rotation of the fixed roller 303 will drive the conveyor belt 310 to rotate further, so that the flat sodium sheet is fed between the two rollers, and then together with the moving roller 304, the sodium sheet is rolled. The rolling process helps to further flatten the sodium sheet and remove surface burrs, improving the quality of the sodium sheet.

[0043] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A device for preparing a sodium sheet negative electrode for a sodium-ion button cell, characterized in that: The base (100) is provided with a flattening mechanism (200) for flattening sodium blocks and a roller pressing mechanism (300) capable of preventing sodium sheets from forming burrs, the roller pressing mechanism (300) comprises two symmetrical side plates (301) provided on the top of the base (100), a fixed rotating roller (303) is rotatably arranged between the side plates (301), a first motor (302) is fixedly arranged on the side wall of the side plate (301), the output end of the first motor (302) is in transmission connection with the end of the fixed rotating roller (303), a movable rotating roller (304) is movably arranged between the side plates (301), the movable rotating roller (304) is arranged above the fixed rotating roller (303), a conveying belt (310) is rotatably arranged between the side walls of the side plates (301), and the rotating shaft of the conveying belt (310) is connected with the rotating shaft of the fixed rotating roller (303) through a belt (309).

2. The device for preparing a sodium sheet negative electrode of a sodium-ion button cell according to claim 1, characterized in that: A slot (308) is formed in the side wall of the side plate (301), a lead screw (313) is rotatably arranged in the slot (308) on the side of the side plate (301) close to the flattening mechanism (200), a connecting block (314) is threadedly connected on the lead screw (313), a guide rod (311) is fixedly arranged in the slot (308) on the side of the side plate (301) away from the flattening mechanism (200), a guide block (312) is slidably arranged on the guide rod (311), an adjusting block (306) is fixedly arranged between the side wall of the guide block (312) and the connecting block (314), the movable rotating roller (304) is rotatably arranged at the bottom of the adjusting block (306), a second motor (307) is arranged on the top of the side plate (301), the output end of the second motor (307) is in transmission connection with the end of the lead screw (313), and a fixed block (305) is fixedly arranged between the side walls of the side plates (301).

3. The device for preparing a sodium sheet negative electrode of a sodium-ion button cell according to claim 1, characterized in that: The flattening mechanism (200) comprises a placing table (202) arranged on the top of the base (100), the top of the placing table (202) is provided with a placing groove (203), the side wall of the placing table (202) is provided with a support frame (201), the top of the support frame (201) is provided with a hydraulic rod (204), the output end of the hydraulic rod (204) is fixedly provided with a pressing plate (205), and the size of the pressing plate (205) is matched with the size of the placing groove (203).

4. The device for preparing a sodium sheet negative electrode of a sodium-ion button cell according to claim 2, characterized in that: The side wall of the side plate (301) is provided with a scale line.

Images