A secondary impurity removal device for carbon nanotube conductive agent

Abstract

This invention discloses a two-stage impurity removal device for carbon nanotube conductive agents, belonging to the field of chemical equipment technology. The device includes a first impurity removal unit and a second impurity removal unit. The first impurity removal unit includes a first barrel with a first inlet and a first outlet. A magnetic suction rod is installed inside the first barrel, and the magnetic suction rod is connected to an external motor via a rotating shaft. Driven by the motor, the magnetic suction rod rotates and stirs, causing magnetic metallic impurities such as iron in the conductive agent inside the first barrel to adhere to the magnetic suction rod. The second impurity removal unit includes a second barrel with a second inlet and a second outlet. An electromagnetic coil is installed outside the second barrel. The conductive agent, after primary impurity removal in the first barrel, is introduced into the second barrel and undergoes secondary adsorption by the electromagnetic coil. The conductive agent after secondary impurity removal is then discharged from the second outlet in the second barrel.

Description

Technical Field

[0001] The invention relates to a secondary impurity removal device for a carbon nanotube conductive agent, belonging to the technical field of chemical equipment. Background Art

[0002] Lithium-ion batteries are secondary batteries that rely on the intercalation and deintercalation of lithium ions between the positive and negative electrodes for charging and discharging. They are composed of positive electrodes, negative electrodes, separators, and electrolytes. Conductive agents are extremely important auxiliary materials that can improve the conductivity of the positive electrode and maintain the stability of the conductivity of the negative electrode material during the charge and discharge cycle. In order to ensure that the electrode has good charge and discharge performance, a certain amount of conductive agent needs to be added when making the electrode sheet.

[0003] The addition of conductive agent can not only improve the performance of the electrode and promote the infiltration of the electrolyte into the electrode, but also effectively increase the migration rate of lithium ions in the electrode material, thereby improving the charge and discharge efficiency of the electrode and the life of the lithium battery. Due to the excellent structure and performance of carbon nanotubes, carbon nanotube conductive agents are very popular; however, since iron and other metal alloy catalysts are used in the preparation process of carbon nanotubes, the presence of iron metal will cause self-discharge of lithium batteries, shortening their service life and increasing safety hazards. Therefore, it is necessary to design a carbon nanotube conductive agent impurity removal device. Summary of the invention

[0004] In order to solve the above-mentioned problems, the present invention provides a carbon nanotube conductive agent impurity removal device, which has a simple structure, high efficiency, and is easy to use and disassemble. The material will not be blocked or stuck when passing through the device. In addition, the device has a low cost and greatly improves the economic benefits. The technical solution is as follows:

[0005] A secondary impurity removal device for a carbon nanotube conductive agent, the device comprising: a first impurity removal unit and a second impurity removal unit, wherein the first impurity removal unit comprises a first barrel body, a first sample inlet and a first sample outlet are provided on the first barrel body, a magnetic rod is provided in the first barrel body, and the magnetic rod is connected to an external motor through a rotating shaft, and is driven by the motor to rotate and stir, so that magnetic metal impurities such as iron in the conductive agent in the first barrel body adhere to the magnetic rod, thereby performing primary impurity removal; the second impurity removal unit comprises a second barrel body, a second sample inlet and a second sample outlet are provided on the second barrel body, an electromagnetic coil is provided on the outer wall of the second barrel body, and the conductive agent after primary impurity removal by the first barrel body is introduced into the second barrel body through a conveying pump, and is subjected to secondary adsorption by the electromagnetic coil of the second barrel body to form secondary impurity removal, and the conductive agent after secondary impurity removal is discharged from the second sample outlet in the second barrel body, and is connected to a conductive agent finished product receiving storage tank through a pipeline.

[0006] According to the impurity removal device of the present invention, the first sample inlet is arranged at one side of the lower part of the first barrel body, and the first sample outlet is arranged at the upper part of the first barrel body.

[0007] According to the impurity removal device of the present invention, the second sample inlet is arranged at the lower part of the second barrel body, and the second sample outlet is arranged at the upper part of the second barrel body.

[0008] According to the impurity removal device of the present invention, in the first impurity removal unit, the magnetic attraction rod can be set as a magnetic attraction rod composed of multiple magnetic rods, and the multiple magnetic rods can be stacked in two stages to form a whole, which is driven by the rotating shaft of the motor to rotate and stir in the first impurity removal unit to absorb impurities.

[0009] According to the impurity removal device of the present invention, the plurality of magnetic bars in the magnetic attraction bar are connected as a whole by means of, for example, a bracket.

[0010] According to the impurity removal device of the present invention, the plurality of magnetic bars in the magnetic attraction bar can form a multi-layer structure by a multi-stage bracket and be connected as a whole.

[0011] According to the impurity removal device of the present invention, in one embodiment, the plurality of magnetic bars in the magnetic attraction bar can be formed into two layers by a secondary bracket and connected as a whole.

[0012] According to the impurity removal device of the present invention, the combination of the multiple magnetic bars in the magnetic attraction bar can be freely arranged to adapt to the first barrel body of the first impurity removal unit, and evenly stir in the barrel body to maximize impurity removal and adsorption.

[0013] According to the impurity removal device of the present invention, the plurality of magnetic bars in the magnetic attraction bar can be permanent magnets; in one embodiment, the plurality of magnetic bars can also be configured as other forms of magnetic attraction bars.

[0014] According to the impurity removal device of the present invention, before starting impurity removal, the configured conductive agent needs to be transported by a delivery pump and introduced into the first sample inlet, and the conductive agent is rotated and stirred by a magnetic rod in the first barrel of the first impurity removal unit to perform primary impurity removal.

[0015] According to the impurity removal device of the present invention, after the first-level impurity removal, the conductive agent discharged from the first sample outlet of the first impurity removal unit is passed into the second impurity removal unit, and the outer wall of the second impurity removal unit is provided with an electromagnetic coil, which can adsorb the metal impurities in the conductive agent again, thereby performing the second-level impurity removal.

[0016] According to the device of the present invention, the conductive agents of the first impurity removal unit and the second impurity removal unit are both transported by a transport pump.

[0017] According to the impurity removal device of the present invention, a water cooling unit can be further provided outside the first impurity removal unit and the second impurity removal unit to remove heat generated by the long-term operation of the first impurity removal unit and the second impurity removal unit.

[0018] According to the impurity removal device of the present invention, a first impurity removal unit and a second impurity removal unit are used to perform secondary impurity removal, the process is simple, and the efficiency is greatly improved. After the carbon nanotube conductive paste passes through the impurity removal device of the present invention, the impurity metal content is reduced to an extremely low content, thereby achieving the purpose of conductive agent impurity removal.

[0019] The beneficial effects of the present invention are:

[0020] The impurity removal device of the present invention uses the first impurity removal unit and the second impurity removal unit to perform secondary demagnetization, which can remove 99.99% of the magnetic metal impurities in the carbon nanotube conductive paste, thereby achieving the purpose of metal impurity removal of the carbon nanotube conductive agent.

[0021] The impurity removal device of the present invention has not only a simple structure and convenient loading and unloading, but also has the advantages of low cost and convenient cleaning and replacement. It is an economical and applicable carbon nanotube conductive agent impurity removal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only schematic illustrations of some embodiments of the present invention. For ordinary technicians in this field, within the scope of the present invention, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 is a front view of a first impurity removal unit of the impurity removal device of the present invention;

[0024] Figure 2 is a top view of a first impurity removal unit of the impurity removal device of the present invention;

[0025] Figure 3 A front view of a second impurity removal unit of the impurity removal device of the present invention;

[0026] Among them: 1. the first sample inlet; 2. the first sample outlet; 3. the rotating shaft; 4. the magnetic rod; 5. the cooling unit; 6. the cooling water inlet; 7. the cooling water outlet; 8. the electromagnetic coil. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1:

[0029] This embodiment provides a secondary impurity removal device for a carbon nanotube conductive agent, such as Figure 1 and Figure 2 As shown, the device includes: a first impurity removal unit and a second impurity removal unit, wherein the first impurity removal unit includes a first barrel body, a first sample inlet 1 and a first sample outlet 2 are provided on the first barrel body, a magnetic rod 4 is provided in the first barrel body, and the magnetic rod 4 is connected to an external motor through a rotating shaft 3, and the motor drives the magnetic rod 4 to rotate and stir, so that magnetic metal impurities such as iron in the conductive agent in the first barrel body are adhered to the magnetic rod, thereby performing primary impurity removal. Figure 2 It is a top view of the internal structure of the first impurity removal unit of the impurity removal device of the present invention, showing the distribution of the magnetic attraction rods 4 inside the first impurity removal unit.

[0030] like Figure 3 As shown, the second impurity removal unit includes a second barrel body, on which a second sample inlet and a second sample outlet are provided, an electromagnetic coil 8 is provided on the outer wall of the second barrel body, and the conductive agent after primary impurity removal through the first barrel body is passed into the second barrel body, and is subjected to secondary adsorption by the electromagnetic coil in the second barrel body to form secondary impurity removal, and the conductive agent after the secondary impurity removal is discharged from the second sample outlet in the second barrel body.

[0031] According to the impurity removal device of this embodiment, the first sample inlet is arranged at one side of the lower portion of the first barrel body, and the first sample outlet is arranged at the upper portion of the first barrel body.

[0032] According to the impurity removal device of this embodiment, the second sample inlet is arranged at the lower part of the second barrel body, and the second sample outlet is arranged at the upper part of the second barrel body.

[0033] According to the impurity removal device of this embodiment, in the first impurity removal unit, the magnetic attraction rod can be set to be a magnetic attraction rod composed of multiple magnetic rods, and the multiple magnetic rods can be stacked in two stages to form a whole, which is driven by the rotating shaft of the motor to rotate and stir in the first impurity removal unit to absorb impurities.

[0034] According to the impurity removal device of this embodiment, the multiple magnetic bars in the magnetic attraction bar are connected as a whole by means of, for example, a bracket.

[0035] According to the impurity removal device of this embodiment, the plurality of magnetic bars in the magnetic attraction bar can form a multi-layer structure by a multi-stage bracket and be connected as a whole.

[0036] According to the impurity removal device of this embodiment, in one implementation, the plurality of magnetic bars in the magnetic attraction bar can be formed into two layers by a secondary bracket and connected as a whole.

[0037] According to the impurity removal device of this embodiment, the combination of the multiple magnetic bars in the magnetic attraction bar can be freely arranged to adapt to the first barrel body of the first impurity removal unit, and evenly stir in the barrel body to maximize impurity removal and adsorption.

[0038] According to the impurity removal device of this embodiment, the plurality of magnetic bars in the magnetic attraction bar can be permanent magnets; in one implementation manner, the plurality of magnetic bars can also be configured as other forms of magnetic attraction bars.

[0039] According to the impurity removal device of this embodiment, before starting impurity removal, the configured conductive agent needs to be introduced into the first sample inlet 1 through a delivery pump, and the conductive agent is rotated and stirred by the magnetic rod 4 in the first barrel of the first impurity removal unit to perform primary impurity removal.

[0040] According to the impurity removal device of this embodiment, after the first-level impurity removal, the conductive agent discharged from the first sample outlet 2 of the first impurity removal unit is introduced into the second impurity removal unit through a conveying pump, and the outer wall of the second impurity removal unit is provided with an electromagnetic coil 8, which can adsorb metal impurities in the conductive agent again, so as to perform the second-level impurity removal. After the second-level impurity removal, the conductive agent discharged from the second sample outlet of the second impurity removal unit is conveyed to the conductive agent finished product receiving tank through a pipeline.

[0041] According to the impurity removal device of this embodiment, a water cooling unit 5 can also be arranged outside the first impurity removal unit and the second impurity removal unit to remove the heat generated by the long-term operation of the second impurity removal unit; in one embodiment, the cooling unit 6 is a water cooling unit, which is connected to a cooling water pipe covering the outside of the second impurity removal unit through a pipeline, and is provided with a cooling water inlet 6 and a cooling water outlet 7.

[0042] According to the impurity removal device of this embodiment, in one implementation manner, the electromagnetic coil 8 and the cooling water pipe of the cooling unit are independently arranged respectively, and the cooling water pipe can be arranged outside the electromagnetic coil 8 .

[0043] According to the impurity removal device of this embodiment, a first impurity removal unit and a second impurity removal unit are used to perform secondary impurity removal. The process is simple and the efficiency is greatly improved. After the carbon nanotube conductive paste passes through the impurity removal device of the present invention, the impurity metal content is reduced to an extremely low content, thereby achieving the purpose of conductive agent impurity removal.

[0044] According to the impurity removal device of the present invention, the first impurity removal unit and the second impurity removal unit are used to perform secondary impurity removal, so that 99.99% of the magnetic metal impurities in the carbon nanotube conductive paste are removed, thereby achieving the purpose of metal impurity removal of the carbon nanotube conductive agent.

[0045] The device of this patent invention has a simple structure, is easy to load and unload, has a low cost, and is easy to clean and replace. It is a more suitable device for removing impurities from carbon nanotube conductive agents.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A secondary impurity removal device for a carbon nanotube conductive agent, characterized in that: The secondary impurity removal device is composed of a first impurity removal unit, a second impurity removal unit and a water cooling unit; The first impurity removal unit comprises a first barrel, a first sample inlet, a first sample outlet, a magnetic rod, a rotating shaft and a motor. The first barrel is provided with a first sample inlet and a first sample outlet, the first sample inlet is provided at one side of the lower part of the first barrel, the first sample outlet is provided at the upper part of the first barrel, a magnetic rod is provided in the first barrel, and the magnetic rod is connected to an external motor through a rotating shaft, and is driven by the motor to rotate and stir, so that magnetic metal impurities in the conductive agent in the first barrel are adhered to the magnetic rod, and primary impurity removal is performed; The second impurity removal unit comprises a second barrel, a second sample inlet, a second sample outlet, an electromagnetic coil and a delivery pump. The second barrel is provided with a second sample inlet and a second sample outlet, the second sample inlet is provided at the lower part of the second barrel, the second sample outlet is provided at the upper part of the second barrel, an electromagnetic coil is provided on the outer wall of the second barrel, and the conductive agent after primary impurity removal in the first barrel is introduced into the second barrel through the delivery pump, and is secondary adsorbed by the electromagnetic coil of the second barrel to form secondary impurity removal, and the conductive agent after secondary impurity removal is discharged from the second sample outlet in the second barrel; The water cooling unit includes a cooling water inlet, a cooling water outlet and a cooling water pipe. The water cooling unit is arranged outside the first impurity removal unit and the second impurity removal unit to remove the heat generated by the long-term operation of the first impurity removal unit and the second impurity removal unit.

2. The device according to claim 1, characterized in that In the first impurity removal unit, the magnetic attraction rod can be configured as a magnetic attraction rod composed of multiple magnetic rods, and the multiple magnetic rods are connected as a whole by a bracket and driven by the rotating shaft of the motor to rotate and stir in the first impurity removal unit to absorb impurities.

3. The device according to claim 1, characterized in that The plurality of magnetic bars in the magnetic attraction bar can form a multi-layer structure by a multi-stage bracket and be connected as a whole.

4. The device according to claim 1, characterized in that The plurality of magnetic rods in the magnetic attraction rod can be formed into two layers by a secondary bracket and connected into a whole.

5. The device according to claim 1, characterized in that The plurality of magnetic bars in the magnetic attraction bar can be permanent magnets.

6. The device according to claim 1, characterized in that Before starting the impurity removal, the configured conductive agent is introduced into the first sample inlet, and the conductive agent is rotated and stirred by the magnetic rod in the first barrel of the first impurity removal unit; after the first-level impurity removal, the conductive agent is discharged from the first sample outlet of the first impurity removal unit and introduced into the second impurity removal unit for secondary impurity removal.

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