A pre-sodiation device for sodium-ion battery anodes

Abstract

This utility model relates to a pre-sodiuming device for the negative electrode of a sodium-ion battery. The negative electrode sheet passes sequentially through a roller, an electrode pressure roller, and a counter roller, and is finally wound onto the electrode sheet winding shaft. A nozzle containing sodium metal powder solution is located above the negative electrode sheet, near one end of the roller. A heating device is located below the negative electrode sheet, in close contact with it, for heating the negative electrode sheet. An infrared thermometer is located above the heating device, near one end of the counter roller. The advantages of this utility model are: the sodium metal powder solution is sprayed onto the electrode sheet through the nozzle, the heating plate heats the electrode sheet to cause the solution to evaporate, and the counter roller applies pressure to the electrode sheet, completing the pre-sodiuming treatment. The rotation of the roller and the counter roller allows unpre-sodiumed electrode sheets to continuously enter below the nozzle, achieving a simple structure and continuous pre-sodiuming operation. The operator can adjust the valve opening using a rotary button on a touch screen, making the flow rate of the sodium metal powder solution adjustable.

Description

Technical Field

[0001] This utility model relates to the field of sodium-ion battery technology, and in particular to a pre-sodiuming device for the negative electrode of a sodium-ion battery. Background Technology

[0002] Sodium-ion batteries have become a highly anticipated new type of energy storage battery due to their advantages such as low cost and abundant sodium resources. The negative electrode is a crucial component of sodium-ion batteries and directly affects their capacity. Because of the irreversible reaction during the initial charge-discharge process that consumes active sodium, the negative electrode suffers from a common problem of low initial coulombic efficiency, reducing the capacity of the sodium-ion battery. To improve the initial coulombic efficiency and increase the capacity of sodium-ion batteries, sodium metal is typically added to the negative electrode for pre-sodiumization. Existing pre-sodiumization devices are used for preparing battery negative electrode materials. These devices include sequentially connected melting, reaction, and cooling sections. They require vacuum treatment and employ both high and low temperature pre-sodiumization processes. These devices are energy-intensive, structurally complex, and difficult to operate, and pose safety hazards at high temperatures, necessitating urgent improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a pre-sodiumification device for the negative electrode of a sodium-ion battery. The device has low energy consumption, simple structure, is easy to operate, and is safe and stable.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] A pre-sodiumification device for a sodium-ion battery negative electrode includes a nozzle 1, a negative electrode sheet 3, a winding spool 4, a heating device 5, rollers 6, an infrared thermometer 8, an electrode pressing roller 9, and an electrode winding shaft 10. The negative electrode sheet 3 passes sequentially through the winding spool 4, the electrode pressing roller 9, and the rollers 6, and is finally wound onto the electrode winding shaft 10. The nozzle 1 contains a sodium metal powder solution 2 and is located above the negative electrode sheet 3, near one end of the winding spool 4. The heating device 5 is located below the negative electrode sheet 3, close to the negative electrode sheet 3, and is used to heat the negative electrode sheet 3. The infrared thermometer 8 is located above the heating device 5, near one end of the rollers 6. The heating device 5 and the infrared thermometer 8 are connected to a control unit.

[0006] The nozzle 1 is equipped with a control valve 7 at its bottom. When the control valve 7 is open, the nozzle 1 sprays sodium metal powder solution 2 onto the negative electrode plate 3. The flow rate of sodium metal powder solution 2 is adjusted by the opening degree of the control valve 7. The control valve 7 is connected to the control unit.

[0007] Control valve 7 is used to regulate the flow rate of sodium metal powder solution 2, and control valve 7 is connected to control unit.

[0008] The spool 4 is used to wind the unsodium-treated negative electrode sheet 3, according to... Figure 1Rotate in the direction indicated by the middle arrow. The length of the spool 4 is greater than the width of the negative electrode 3, and the difference between the length of the spool 4 and the width of the negative electrode 3 is 2 to 20 cm.

[0009] The electrode pressure roller 9 is fixedly installed above the heating device 5 by a bracket. There is a gap between the electrode pressure roller 9 and the heating device 5, which ranges from 0.1 to 10 mm. The negative electrode 3 passes through the gap between the heating device 5 and the pressure roller 9. The pressure roller 9 rotates as the negative electrode 3 moves. The pressure roller 9 is used to prevent the negative electrode 3 from curling during the movement. It can make the negative electrode 3 and the heating device 5 press firmly and fit together, thereby improving the heating effect.

[0010] The length of the electrode pressure roller 9 is greater than the width of the negative electrode 3, and the difference between the length of the electrode pressure roller 9 and the negative electrode 3 is 1-10 cm. The rollers 6 can rotate and are used to apply pressure to the negative electrode 3, increasing the electrical contact between the sodium metal and the electrode. The negative electrode 3 passes through the gap between the rollers 6. The length of the rollers 6 is greater than the width of the negative electrode 3, and the difference between the length of the rollers 6 and the width of the negative electrode 3 is 2-20 cm. The electrode winding shaft 10 can rotate and is used to wind and collect the pre-sodiumized negative electrode 3. The length of the electrode winding shaft 10 is greater than the width of the negative electrode 3, and the difference between the length of the electrode winding shaft 10 and the width of the negative electrode 3 is 2-20 cm.

[0011] The side of the negative electrode 3 containing the active material faces upward. The active material includes one or more of the following: hard carbon, soft carbon, artificial graphite, natural graphite, needle coke, petroleum coke, and negative electrode coke.

[0012] Infrared thermometer 8 is used to detect the surface temperature of negative electrode 3, and heating device 5 is used to heat negative electrode 3.

[0013] The heating device includes a heating plate and a heater. The heating plate is in close contact with the negative electrode plate 3, and the heater is used to heat the heating plate.

[0014] The control unit includes a PLC, which includes a CPU, a digital input module, a digital output module, and an analog input module. The analog input module is connected to the infrared thermometer via a port, and the digital output module is connected to the relay group via a port. The normally open contacts of the relay group are connected to the control valve 7 and the coil of the contactor, respectively. The main contacts of the contactor are connected to the heater.

[0015] The control unit also includes a touch screen and a power module. The power module, CPU, digital input module, digital output module, and analog input module are connected through ports, and the touch screen and CPU are connected through a communication port.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Sodium metal powder solution is sprayed onto the electrode through a nozzle, the heating plate heats the electrode to make the solution evaporate, and the rollers apply pressure to the electrode to complete the pre-sodium treatment. The rotation of the roller and the rollers can continuously bring the unsodium treated electrode into the area below the nozzle, realizing a simple structure and continuous pre-sodium treatment operation.

[0018] 2. The system uses control valve 7, which can be adjusted by the operator via a rotary button on the touch screen. This allows for adjustable flow rate of the sodium metal powder solution. The system is simple in structure and easy to operate.

[0019] 3. The analog input module is connected to the infrared thermometer via a port, and the digital output module is connected to relay groups KA1 and KA2 via a port. The normally open contacts of relay groups KA1 and KA2 are connected to the coil of contactor KM1, and the main contacts of contactor KM1 are connected to the heater. The operator can heat the negative electrode plate through the buttons on the touch screen and can view the temperature information detected by the infrared thermometer at any time through the touch screen. The operation is simple and maintenance is convenient.

[0020] 4. This device uses sodium metal powder organic solution, which avoids direct contact between metallic sodium and moisture and air, thus improving safety during storage and operation.

[0021] 5. This device rolls the composite sodium metal electrode, which increases the electrical contact between the sodium metal and the electrode and improves the pre-sodiumization effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the pre-sodiumification device for the negative electrode of a sodium-ion battery.

[0023] Figure 2 This is a top view showing the relative positions of the pressure roller and the negative electrode sheet.

[0024] Figure 3 This is a schematic diagram of the electrical principle of a pre-sodiumification device for the negative electrode of a sodium-ion battery.

[0025] In the diagram: 1- Nozzle; 2- Sodium metal powder solution; 3- Negative electrode sheet; 4- Roller; 5- Heating device; 6- Roller pair; 7- Valve; 8- Infrared thermometer; 9- Electrode sheet pressure roller; 10- Electrode sheet winding shaft; 11- Connecting line; 12- Heater control console. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0027] The following embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0028] 【Example 1】

[0029] See Figure 1 , Figure 2 A pre-sodiumification device for a sodium-ion battery negative electrode includes a nozzle 1, a negative electrode sheet 3, a winding spool 4, a heating device 5, rollers 6, an infrared thermometer 8, an electrode pressure roller 9, and an electrode winding shaft 10. The negative electrode sheet 3 passes sequentially through the winding spool 4, the electrode pressure roller 9, and the rollers 6, and is finally wound onto the electrode winding shaft 10. The electrode pressure roller 9 is fixedly mounted above the heating device 5 by a bracket, and a gap of 0.1-10 mm is left between the electrode pressure roller 9 and the heating device 5. The negative electrode sheet 3 passes through the gap between the heating device 5 and the electrode pressure roller 9. The electrode pressure roller 9 supports the negative electrode sheet 3 and rotates as the negative electrode sheet 3 moves. The electrode pressure roller 9 helps to tighten the negative electrode sheet 3 more firmly with the heating device 5. The electrodes are tightly bonded, which improves the heating effect and prevents the negative electrode sheet 3 from curling during movement. The length of the electrode pressing roller 9 is 1-10 cm greater than the width of the negative electrode sheet 3. The side of the negative electrode sheet 3 with the active material faces upward. The active material includes one or more of the following: hard carbon, soft carbon, artificial graphite, natural graphite, needle coke, petroleum coke, and negative electrode coke. A control valve 7 is installed at the bottom of the nozzle 1. The nozzle 1 is used to hold sodium metal powder solution 2. The spraying of sodium metal powder solution 2 is controlled by the control valve 7. When the control valve 7 is open, sodium metal powder solution 2 can be sprayed onto the negative electrode sheet 3. The flow rate of sodium metal powder solution 2 is controlled by the size of the opening of the control valve 7. The control valve 7 is connected to the control unit.

[0030] The nozzle is located above the negative electrode sheet 3, near one end of the reel 4. The heating device 5 is located below the negative electrode sheet 3, in close contact with it. The heating device includes a heating plate and a heater. The heating plate is in close contact with the negative electrode sheet 3, and the heater is used to heat the heating plate. The infrared thermometer 8 is located above the heating device 5, near one end of the roller 6. The infrared thermometer 8 is used to detect the surface temperature of the negative electrode sheet 3. The heater control console 12 is equipped with a contactor KM1. The contactor KM1 is used to heat the negative electrode sheet 3 by engaging / disengaging it. The reel 4 is used to wind the unsodium-treated negative electrode sheet 3. The roller 6 can rotate to apply pressure to the negative electrode sheet 3, increasing the electrical contact between the sodium metal and the electrode sheet. The electrode winding shaft 10 can rotate to wind and collect the pre-sodium-treated negative electrode sheet 3.

[0031] See Figure 3The control unit includes a PLC, which comprises a CPU, digital input modules, digital output modules, and analog input modules. The analog input modules are connected to the infrared thermometer via ports, and the digital output modules are connected to relay groups KA1 and KA2 via ports. The normally open contacts of relay groups KA1 and KA2 are connected to the coils of control valve 7 and contactor KM1, respectively. The main contacts of contactor KM1 are connected to the heater. The control unit also includes a touch screen and a power module. The CPU, digital input modules, digital output modules, and analog input modules are connected via ports, and the touch screen is connected to the CPU via a communication port. The power module provides operating power to the PLC and the touch screen.

[0032] Work process:

[0033] During pre-sodiumization, the roller 4, the counter roller 6, and the electrode winding shaft 10 are arranged according to... Figure 1 Rotating in the direction indicated by the middle arrow, the negative electrode 3 moves from one end to the other. Sodium metal powder solution 2 is sprayed onto the negative electrode 3 through nozzle 1. Heating device 5 heats the electrode to evaporate the solvent. Pressure roller 9 keeps the electrode tightly against heating device 5, enhancing the heating effect and preventing the electrode from curling during movement. Infrared thermometer 8 detects the surface temperature of the negative electrode. Roller 6 applies pressure to the electrode to complete the pre-sodium treatment. The pre-sodium treated negative electrode 3 is wound onto electrode winding shaft 10 for winding and collection. The rotation of winding shaft 4, roller 6, and electrode winding shaft 10 allows untreated electrodes to continuously enter below nozzle 1, continuously performing the above pre-sodium treatment operation. This allows sodium metal particles to directly and physically combine with the electrode, pre-embedding the missing active sodium in the electrode, thereby achieving the purpose of pre-sodium treatment. This device is simple and efficient, operates at a relatively low temperature, has a wide range of applications, and can continuously perform pre-sodium treatment operations.

[0034] This invention employs a nozzle to spray sodium metal powder solution onto an electrode sheet, a heating plate to heat the electrode sheet and evaporate the solvent, and rollers to apply pressure to the electrode sheet, completing the pre-sodiumization treatment. The rotation of the rollers and the spool continuously feeds unsodiumized electrode sheets under the nozzle, achieving a simple and continuous pre-sodiumization operation. A control valve 7 is used, and the operator can adjust its opening degree via a rotary button on a touchscreen, allowing for adjustable flow of the sodium metal powder solution. The structure is simple and easy to operate. The analog input module is connected to an infrared thermometer via a port, and the digital output module is connected to relay groups KA1 and KA2 via a port. The normally open contacts of relay groups KA1 and KA2 are connected to the coil of contactor KM1, and the main contacts of contactor KM1 are connected to the heater. The operator can heat the negative electrode plate through the buttons on the touch screen and can view the temperature information detected by the infrared thermometer at any time through the touch screen. The operation is simple and easy to maintain. The device uses sodium metal powder organic solution, which avoids direct contact between metallic sodium and moisture and air, improving safety during storage and operation. The device rolls the composite sodium metal electrode plate, which can increase the electrical contact between sodium metal and the electrode plate and improve the pre-sodiumization effect.

Claims

1. A pre-sodiumification device for a sodium-ion battery negative electrode, characterized in that, The device includes a nozzle, a negative electrode sheet, a reel, a heating device, rollers, an infrared thermometer, an electrode pressure roller, and an electrode winding shaft. The negative electrode sheet passes sequentially through the reel, the electrode pressure roller, and the rollers before finally winding onto the electrode winding shaft. The nozzle contains a sodium metal powder solution and is located above the negative electrode sheet, near one end of the reel. The heating device is located below the negative electrode sheet, in close contact with it, and is used to heat the negative electrode sheet. The infrared thermometer is located above the heating device, near one end of the rollers. The heating device and the infrared thermometer are connected to a control unit.

2. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The nozzle is equipped with a control valve at its bottom, which is connected to the control unit.

3. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The spool is used to wind the unsodium-treated negative electrode sheet. The length of the spool is greater than the width of the negative electrode sheet, and the difference between the length of the spool and the width of the negative electrode sheet is 2~20cm.

4. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The electrode pressure roller is fixedly installed above the heating device by a bracket. There is a gap between the electrode pressure roller and the heating device, which ranges from 0.1 to 10 mm. The electrode pressure roller is used to support the negative electrode and rotates as the negative electrode moves.

5. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The length of the electrode pressure roller is greater than the width of the negative electrode sheet, and the difference between the length of the electrode pressure roller and the negative electrode sheet is 1~10cm. The length of the roller is greater than the width of the negative electrode sheet, and the difference between the length of the roller and the width of the negative electrode sheet is 2~20cm. The length of the electrode winding shaft is greater than the width of the negative electrode sheet, and the difference between the length of the electrode winding shaft and the width of the negative electrode sheet is 2~20cm.

6. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The negative electrode sheet has the side with the active material facing upwards. The active material includes one or more of the following: hard carbon, soft carbon, artificial graphite, natural graphite, needle coke, petroleum coke, and negative electrode coke.

7. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The infrared thermometer is used to detect the surface temperature of the negative electrode sheet, and the heating device is used to heat the negative electrode sheet.

8. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The heating device includes a heating plate and a heater. The heating plate is in close contact with the negative electrode plate, and the heater is used to heat the heating plate.

9. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 1, characterized in that, The control unit includes a PLC, which includes a CPU, a digital input module, a digital output module, and an analog input module. The analog input module is connected to the infrared thermometer via a port, and the digital output module is connected to a relay group via a port. The normally open contacts of the relay group are connected to the coils of the control valve and the contactor, respectively, and the main contacts of the contactor are connected to the heater.

10. The pre-sodiumification device for a sodium-ion battery negative electrode according to claim 9, characterized in that, The control unit also includes a touch screen and a power module. The power module, CPU, digital input module, digital output module, and analog input module are connected via ports, and the touch screen and CPU are connected via a communication port.

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