Battery infiltration device

Abstract

The utility model relates to a battery infiltration device and belongs to the technical field of batteries. The battery infiltration device comprises a centrifugal autorotation device and a magnetic field generating coil, the battery cell is connected to the centrifugal autorotation device and rotates synchronously with the centrifugal autorotation device, and the magnetic field generating coil surrounds the battery cell and generates magnetic lines penetrating through the battery cell in the axial direction of the battery cell; wherein the central axis of the battery cell coincides with the rotating shaft of the centrifugal autorotation device; the centrifugal autorotation device drives the battery cell to rotate, so that the electrolyte in the battery cell is diffused under the action of centrifugal force; when the battery cell rotates, magnetic lines of force are cut, so that eddy current is generated in the battery cell to heat electrolyte in the battery cell, and the infiltration efficiency of the electrolyte is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries and relates to a battery infiltration device. Background Art

[0002] With the rapid development of markets such as electric vehicles and portable electronic devices, as the core energy component, the performance and production efficiency improvement of lithium-ion batteries have become the focus of the industry. During the production process of lithium-ion batteries, the infiltration effect of the electrolyte is directly related to the performance and safety of the batteries. Traditional battery infiltration methods often have problems such as low infiltration efficiency and uneven infiltration, and it is difficult to meet the production requirements of modern high-energy density batteries.

[0003] In the prior art, battery infiltration usually relies on simple static placement or simple mechanical stirring. These methods are difficult to ensure the uniform distribution of the electrolyte inside the battery, especially in the porous electrodes, resulting in inconsistent battery performance and potential safety hazards. For high-energy density lithium-ion batteries, their porous electrode structures are complex and the pore size distributions are uneven, making it more difficult for the electrolyte to infiltrate. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a battery infiltration device. The centrifugal self-rotation device drives the battery cell to rotate, and the centrifugal force is used to quickly and evenly diffuse the electrolyte inside the battery cell; the magnetic field generating coil surrounds the battery cell and generates magnetic lines of force, so that when the battery cell rotates, it can cut the magnetic lines of force to generate eddy currents, thereby heating the electrolyte inside the battery cell, further promoting the infiltration of the electrolyte, and thus improving the infiltration efficiency of the electrolyte.

[0005] To achieve the above purpose, the utility model provides a battery infiltration device, including a centrifugal self-rotation device and a magnetic field generating coil. The battery cell is connected to the centrifugal self-rotation device and rotates synchronously with it. The magnetic field generating coil is sleeved on the battery cell and generates magnetic lines of force that penetrate the battery cell along the axial direction of the battery cell; wherein, the central axis of the battery cell coincides with the rotation axis of the centrifugal self-rotation device; the centrifugal self-rotation device drives the battery cell to rotate, so that the electrolyte in the battery cell diffuses under the action of centrifugal force; when the battery cell rotates, it cuts the magnetic lines of force, generating eddy currents inside the battery cell to heat the electrolyte inside the battery cell.

[0006] Optionally, the magnetic field generating coil is an electromagnetic induction coil through which an alternating current is passed.

[0007] Optionally, the magnetic field generating coil is a permanent magnet coil.

[0008] Optionally, the battery cell is connected to the centrifugal self-rotation device through a support device provided on the centrifugal self-rotation device, and the rotation axis of the support device coincides with the rotation axis of the centrifugal self-rotation device.

[0009] Optionally, a groove matching the shape of the battery cell is provided on the supporting device to fix the battery cell.

[0010] Optionally, the battery cell is connected to the centrifugal self-rotation device through a fixture provided on the centrifugal self-rotation device.

[0011] Optionally, the electromagnetic induction coil includes at least two coil windings, and the at least two coil windings are sleeved on the battery cell in a nested manner with each other.

[0012] Optionally, a liquid injection device is further included. The liquid injection device includes a robotic arm and a liquid injection needle provided at one end of the robotic arm. The liquid injection needle is located above the battery cell.

[0013] Optionally, a temperature detection device and a weight detection device are further included. The temperature detection device is provided on the supporting device to detect the temperature of the battery cell, and the weight detection device is provided on the centrifugal self-rotation device.

[0014] Optionally, the centrifugal self-rotation device is a magnetic levitation drive device. The centrifugal self-rotation device includes a stator and a rotor. The stator is provided on the base of the centrifugal self-rotation device, the supporting device is provided on the rotor, and the rotor drives the battery cell to rotate synchronously through the supporting device; wherein, an electromagnetic shielding device is provided between the supporting device and the rotor.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The present utility model drives the battery cell to rotate through the centrifugal self-rotation device, and uses centrifugal force to quickly and evenly diffuse the electrolyte inside the battery cell. Compared with the traditional static or simple mechanical stirring method, the infiltration efficiency of the electrolyte is significantly improved. The magnetic field generating coil surrounds the battery cell and generates magnetic lines of force, so that when the battery cell rotates, it can cut the magnetic lines of force and generate eddy currents, thereby heating the electrolyte inside the battery cell. Through the above heating method, not only the viscosity of the electrolyte is reduced, but also the infiltration of the electrolyte is further promoted, realizing the simultaneous heating and infiltration, and improving the infiltration efficiency of the electrolyte.

[0017] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following description. Description of the Drawings

[0018] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail preferably with reference to the accompanying drawings, where:

[0019] Figure 1 is a structural schematic diagram of the battery infiltration device provided by the present utility model.Figure 1 ;

[0020] Figure 2 Structural schematic of the battery infiltration device provided by the present utility model Figure 2 ;

[0021] Figure 3 Structural schematic of the battery infiltration device provided by the present utility model Figure 3 ;

[0022] Figure 4 Structural schematic of the battery infiltration device provided by the present utility model Figure 4 ;

[0023] Figure 5 Structural schematic of the battery infiltration device provided by the present utility model Figure 5 ;

[0024] Figure 6 Structural schematic of the battery infiltration device provided by the present utility model Figure 6 .

[0025] Reference numerals: 100 - battery cell; 200 - electromagnetic induction coil; 300 - support device; 400 - centrifugal self - rotation device; 500 - liquid injection device; 600 - fixture; 700 - mover; 800 - stator; 900 - electromagnetic shielding device; 1000 - permanent magnet coil. Specific embodiments

[0026] The following specific examples illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0027] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well - known structures and their descriptions in the drawings may be omitted.

[0028] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The present utility model provides a battery infiltration device, which realizes the efficient and uniform infiltration of the electrolyte in the battery cell through the technologies of centrifugal self-rotation and magnetic field induction heating. The following will describe the specific embodiments of the present utility model in detail.

[0030] The battery infiltration device of the present utility model mainly includes a centrifugal self-rotation device 400 and a magnetic field generating coil. The battery cell 100 is connected to the centrifugal self-rotation device 400 and rotates synchronously with it. The magnetic field generating coil is sleeved on the battery cell 100 to generate magnetic lines of force that penetrate the battery cell 100 along the axial direction of the battery cell 100. In particular, the central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotation device 400. This design ensures the stability of the battery cell 100 during rotation and also enables the electrolyte to spread more evenly under the action of centrifugal force.

[0031] The centrifugal self-rotation device 400 drives the battery cell 100 to rotate, and the centrifugal force is used to promote the rapid diffusion of the electrolyte in the battery cell 100. During this process, the penetration depth of the electrolyte in the porous electrode of the battery cell 100 is significantly increased, thereby improving the infiltration efficiency. At the same time, when the battery cell 100 rotates, it will cut the magnetic lines of force. According to the principle of electromagnetic induction, eddy currents will be generated inside the battery cell 100, thereby heating the electrolyte in the battery cell 100. The heating of the electrolyte reduces its viscosity and further promotes the infiltration effect of the electrolyte. The dual effects of centrifugal self-rotation and electromagnetic induction heating enable the electrolyte to infiltrate the battery cell 100 more quickly, improving the production efficiency.

[0032] Optionally, the magnetic field generating coil can be an electromagnetic induction coil 200 through which an alternating current is passed, or a permanent magnet coil 1000 can be selected.

[0033] To better fix the battery cell 100 and ensure its synchronous rotation with the centrifugal self-rotation device 400, the battery cell 100 is connected to the centrifugal self-rotation device 400 through the support device 300. The support device 300 is provided with a groove matching the outer shape of the battery cell 100 to firmly fix the battery cell 100. At the same time, the rotation axis of the support device 300 coincides with the rotation axis of the centrifugal self-rotation device 400, ensuring the stability and consistency of rotation.

[0034] Optionally, the battery cell 100 can also be connected through a fixture 600 provided on the centrifugal self-rotation device 400. The design of the fixture 600 makes the installation and disassembly of the battery cell 100 more convenient, and also ensures the stability of the battery cell 100 during rotation.

[0035] Optionally, when the electromagnetic induction coil 200 is adopted, the coil can include at least two coil windings, and these coil windings are nested and superimposed on each other to enhance the generation of magnetic lines of force and the heating effect of the battery cell 100.

[0036] To further improve the infiltration efficiency, the present utility model further includes a liquid injection device 500. The liquid injection device 500 is composed of a robotic arm and a liquid injection needle. One end of the robotic arm is provided with the liquid injection needle, and the liquid injection needle is located above the battery cell 100. During the infiltration process, the liquid injection device 500 can accurately inject the electrolyte into the battery cell 100, and cooperate with centrifugal self-rotation and electromagnetic induction heating to achieve rapid infiltration of the electrolyte.

[0037] In addition, the present utility model is also equipped with a temperature detection device and a weight detection device. The temperature detection device is arranged on the support device 300 to monitor the temperature of the battery cell 100 in real time to ensure the safety of the heating process. The weight detection device is arranged on the centrifugal self-rotation device 400 to detect the weight change of the battery cell 100 during the infiltration process, so as to judge whether the infiltration is sufficient.

[0038] It is particularly worth mentioning that the centrifugal self-rotation device 400 can also adopt a magnetic levitation drive device. This device includes a stator 800 and a rotor 700. The stator 800 is arranged on the base of the centrifugal self-rotation device 400, and the support device 300 is arranged on the rotor 700. The rotor 700 drives the battery cell 100 to rotate synchronously through the support device 300, realizing a rotation mode of non-contact and low friction. At the same time, an electromagnetic shielding device 900 is also arranged between the support device 300 and the rotor 700 to effectively prevent the influence of electromagnetic interference on the performance of the battery cell 100.

[0039] To better understand the technical solution of the present utility model, the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Embodiments 1 to 6 respectively show the specific implementation manners of the present utility model in different application scenarios. Through these embodiments, the technical features and application effects of the present utility model can be more comprehensively understood.

[0040] Embodiment 1:

[0041] Figure 1 The structural schematic of the battery infiltration device provided by the present utility model Figure 1 . As Figure 1 shown, the battery infiltration device includes a centrifugal self-rotation device 400 and an electromagnetic induction coil 200. The battery cell 100 is connected to the centrifugal self-rotation device 400 and rotates synchronously with it. The electromagnetic induction coil 200 through which an alternating current is passed is sleeved on the battery cell 100 and generates magnetic force lines that axially penetrate the battery cell 100 along the battery cell 100. The battery cell 100 is connected to the centrifugal self-rotation device 400 through a support device 300. The support device 300 is provided with a groove matching the outer shape of the battery cell 100 to fix the battery cell 100. The rotation axis of the support device 300 coincides with the rotation axis of the centrifugal self-rotation device 400. The central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotation device 400. The centrifugal self-rotation device 400 drives the battery cell 100 to rotate, so that the electrolyte in the battery cell 100 diffuses under the action of centrifugal force. When the battery cell 100 rotates, it cuts the magnetic force lines, generating eddy currents inside the battery cell 100 to heat the electrolyte in the battery cell 100.

[0042] Embodiment 2:

[0043] Figure 2 The structural schematic of the battery infiltration device provided by the present utility model Figure 2 . As Figure 2As shown in the figure, the battery soaking device includes a centrifugal self-rotating device 400 and an electromagnetic induction coil 200. The battery cell 100 is connected to the centrifugal self-rotating device 400 and rotates synchronously with it. The electromagnetic induction coil 200 through which an alternating current is passed is sleeved on the battery cell 100 and generates magnetic lines of force that penetrate the battery cell 100 along the axial direction of the battery cell 100. The battery soaking device further includes a liquid injection device 500. The liquid injection device 500 includes a robotic arm. One end of the robotic arm is provided with a liquid injection needle head, and the liquid injection needle head is arranged above the battery cell 100. The electrolyte can be added to the battery cell 100 through the liquid injection device 500. The battery cell 100 is connected to the centrifugal self-rotating device 400 through a support device 300. The support device 300 is provided with a groove matching the outer shape of the battery cell 100 to fix the battery cell 100. The rotation axis of the support device 300 coincides with the rotation axis of the centrifugal self-rotating device 400. The central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotating device 400. The centrifugal self-rotating device 400 drives the battery cell 100 to rotate, so that the electrolyte in the battery cell 100 diffuses under the action of centrifugal force. When the battery cell 100 rotates, it cuts the magnetic lines of force, generating eddy currents inside the battery cell 100 to heat the electrolyte in the battery cell 100.

[0044] Embodiment III:

[0045] Figure 3 Structural schematic of the battery soaking device provided by the present utility model Figure 3 As Figure 3 shown in the figure, the battery soaking device includes a centrifugal self-rotating device 400 and an electromagnetic induction coil 200. The battery cell 100 is connected to the centrifugal self-rotating device 400 and rotates synchronously with it. The electromagnetic induction coil 200 through which an alternating current is passed is sleeved on the battery cell 100 and generates magnetic lines of force that penetrate the battery cell 100 along the axial direction of the battery cell 100. The electromagnetic induction coil 200 includes at least two coil windings, and the at least two coil windings are nested with each other. The coil windings are nested with each other to enhance the generation of magnetic lines of force and the heating effect of the battery cell 100. The battery cell 100 is connected to the centrifugal self-rotating device 400 through a support device 300. The support device 300 is provided with a groove matching the outer shape of the battery cell 100 to fix the battery cell 100. The rotation axis of the support device 300 coincides with the rotation axis of the centrifugal self-rotating device 400. The central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotating device 400. The centrifugal self-rotating device 400 drives the battery cell 100 to rotate, so that the electrolyte in the battery cell 100 diffuses under the action of centrifugal force. When the battery cell 100 rotates, it cuts the magnetic lines of force, generating eddy currents inside the battery cell 100 to heat the electrolyte in the battery cell 100.

[0046] Embodiment IV:

[0047] Figure 4 Structural schematic of the battery soaking device provided by the present utility model Figure 4 As Figure 4As shown, the battery soaking device includes a centrifugal self-rotation device 400 and an electromagnetic induction coil 200. The battery cell 100 is connected to the centrifugal self-rotation device 400 and rotates synchronously with it. The electromagnetic induction coil 200 through which an alternating current is passed is sleeved on the battery cell 100 and generates magnetic lines of force that penetrate the battery cell 100 along the axial direction of the battery cell 100. The battery cell 100 can also be connected through a fixture 600 provided on the centrifugal self-rotation device 400. The design of the fixture 600 makes the installation and disassembly of the battery cell 100 more convenient, and at the same time ensures the stability of the battery cell 100 during rotation. The central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotation device 400. The centrifugal self-rotation device 400 drives the battery cell 100 to rotate, so that the electrolyte in the battery cell 100 diffuses under the action of centrifugal force. When the battery cell 100 rotates, it cuts the magnetic lines of force, generating eddy currents inside the battery cell 100 to heat the electrolyte in the battery cell 100. The battery soaking device is also provided with a temperature detection device and a weight detection device. The temperature detection device is arranged on the support device 300 and is used to monitor the temperature of the battery cell 100 in real time to ensure the safety of the heating process. The weight detection device is arranged on the centrifugal self-rotation device 400 and is used to detect the weight change of the battery cell 100 during the soaking process, so as to judge whether the soaking is sufficient.

[0048] Embodiment Five:

[0049] Figure 5 Structural schematic of the battery soaking device provided by the present utility model Figure 5 As Figure 5As shown in the figure, the battery soaking device includes a centrifugal self-rotating device 400 and an electromagnetic induction coil 200. The battery cell 100 is connected to the centrifugal self-rotating device 400 and rotates synchronously with it. The electromagnetic induction coil 200 through which an alternating current is passed is sleeved on the battery cell 100 and generates magnetic lines of force that penetrate the battery cell 100 along the axial direction of the battery cell 100. The centrifugal self-rotating device 400 can be a magnetic levitation driving device. The magnetic levitation driving device includes a stator 800 and a rotor 700. The stator 800 is arranged on the operation platform for battery soaking, while the support device 300 is arranged on the rotor 700. The rotor 700 drives the battery cell 100 to rotate synchronously through the support device 300, realizing a non-contact and low-friction rotation mode. At the same time, an electromagnetic shielding device 900 is also arranged between the support device 300 and the rotor 700 to effectively prevent the influence of electromagnetic interference on the performance of the battery cell 100. The battery cell 100 is connected to the centrifugal self-rotating device 400 through the support device 300. The support device 300 is provided with a groove matching the outer shape of the battery cell 100 to fix the battery cell 100. The rotation axis of the support device 300 coincides with the rotation axis of the centrifugal self-rotating device 400. The central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotating device 400. The centrifugal self-rotating device 400 drives the battery cell 100 to rotate, causing the electrolyte in the battery cell 100 to diffuse under the action of centrifugal force. When the battery cell 100 rotates, it cuts the magnetic lines of force, generating eddy currents inside the battery cell 100, thereby heating the electrolyte in the battery cell 100.

[0050] Embodiment Six:

[0051] Figure 6 Structural schematic of the battery soaking device provided by the present utility model Figure 6 . As Figure 6 shown in the figure, the battery soaking device includes a centrifugal self-rotating device 400 and a permanent magnet coil 1000. The battery cell 100 is connected to the centrifugal self-rotating device 400 and rotates synchronously with it. The permanent magnet coil 1000 is sleeved on the battery cell 100 and generates magnetic lines of force that penetrate the battery cell 100 along the axial direction of the battery cell 100. The battery cell 100 is connected to the centrifugal self-rotating device 400 through the support device 300. The support device 300 is provided with a groove matching the outer shape of the battery cell 100 to fix the battery cell 100. The rotation axis of the support device 300 coincides with the rotation axis of the centrifugal self-rotating device 400. The central axis of the battery cell 100 coincides with the rotation axis of the centrifugal self-rotating device 400. The centrifugal self-rotating device 400 drives the battery cell 100 to rotate. On the one hand, the electrolyte in the battery cell 100 diffuses under the action of centrifugal force. On the other hand, the battery cell 100 cuts the constant magnetic lines of force through centrifugal self-rotation movement, thereby generating an alternating current, that is, eddy current, and further generating an electromagnetic induction heating effect. The greater the centrifugal speed, the greater the diffusion soaking rate driven by centrifugal force, the greater the electromagnetic induction heating effect, and the higher the battery soaking rate and soaking uniformity. By adjusting the centrifugal speed, the centrifugal diffusion soaking and electromagnetic induction heating effect can be regulated simultaneously, thus simplifying the regulation steps.

[0052] The battery infiltration device of the present utility model combines centrifugal self-rotation and magnetic field induction heating technologies to achieve efficient and uniform infiltration of the electrolyte. This device not only improves the infiltration efficiency and production efficiency but also ensures the safety and stability of the infiltration process. At the same time, the configuration of the liquid injection device, temperature detection device, and weight detection device further enhances the accuracy and controllability of infiltration.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present utility model.

Claims

1. A battery soaking device, characterized in that: It includes a centrifugal self-rotation device (400) and a magnetic field generating coil. The battery cell (100) is connected to the centrifugal self-rotation device (400) and rotates synchronously with it. The magnetic field generating coil is sleeved on the battery cell (100) and generates magnetic force lines that axially penetrate the battery cell (100) along the axis of the battery cell (100). Among them, the central axis of the battery cell (100) coincides with the rotation axis of the centrifugal self-rotation device (400); the centrifugal self-rotation device (400) drives the battery cell (100) to rotate, so that the electrolyte in the battery cell (100) diffuses under the action of centrifugal force; when the battery cell (100) rotates, it cuts the magnetic force lines, generating eddy currents inside the battery cell (100) to heat the electrolyte in the battery cell (100).

2. The battery soaking device according to claim 1, wherein: The magnetic field generating coil is an electromagnetic induction coil (200) through which an alternating current is passed.

3. The battery soaking device according to claim 1, wherein: The magnetic field generating coil is a permanent magnet coil (1000).

4. A battery soaking device according to claim 2 or 3, characterized in that: The battery cell (100) is connected to the centrifugal self-rotation device (400) through a support device (300) provided on the centrifugal self-rotation device (400), and the rotation axis of the support device (300) coincides with the rotation axis of the centrifugal self-rotation device (400).

5. The battery soaking device according to claim 4, characterized in that: A groove matching the outer shape of the battery cell (100) is provided on the support device (300) to fix the battery cell (100).

6. A battery soaking device according to claim 2 or 3, characterized in that: The battery cell (100) is connected to the centrifugal self-rotation device (400) through a fixture (600) provided on the centrifugal self-rotation device (400).

7. A battery soaking device according to claim 2, characterized in that: The electromagnetic induction coil (200) includes at least two coil windings, and at least two coil windings are sleeved on the battery cell (100) in a nested manner.

8. A battery soaking device according to any one of claims 1 to 3, 5 or 7, characterized in that: It further includes a liquid injection device (500). The liquid injection device (500) includes a robotic arm and a liquid injection needle provided at one end of the robotic arm. The liquid injection needle is located above the battery cell (100).

9. The battery soaking device according to claim 4, characterized in that: It further includes a temperature detection device and a weight detection device. The temperature detection device is provided on the support device (300) to detect the temperature of the battery cell (100), and the weight detection device is provided on the centrifugal self-rotation device (400).

10. A battery soaking device according to claim 4, characterized in that: The centrifugal self-rotation device (400) is a magnetic levitation drive device, including a stator (800) and a rotor (700); the support device (300) is provided on the rotor (700), and the rotor (700) drives the battery cell (100) to rotate synchronously through the support device (300); among them, an electromagnetic shielding device (900) is provided between the support device (300) and the rotor (700).

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