Filtering device for preheating lithium battery modules

Abstract

This utility model relates to the field of lithium battery module technology, specifically to a filter device for preheating lithium battery modules. It includes a tube body and a filter screen for covering and sealing the interior of the tube body. The filter screen is slidably connected to the inner wall of the tube body along the tube body's axial direction. An elastic support member is provided on the filter screen facing away from the input end of the tube body. One end of the elastic support member abuts against the filter screen, and the other end abuts against the inner wall of the output end of the tube body. A marking rod is rotatably connected to the outer wall of the tube body, and the plane of its rotation trajectory is parallel to the axis of the tube body. A linkage component is provided between the marking rod and the filter screen. When the filter screen slides inside the tube body, the linkage component drives the marking rod to rotate outside the tube body. This solves the problem in existing technologies where filter screens are usually located inside pipes, making it difficult to visually determine the degree of clogging of the filter pores and control the cleaning or replacement time.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery module technology, specifically to a filter device for preheating lithium battery modules. Background Technology

[0002] In cold environments, the performance of lithium battery modules degrades significantly. To ensure normal startup and efficient operation, preheating of the lithium battery modules at low temperatures is often necessary. The preheating process is typically achieved by circulating a heating medium (such as silicone oil) through the battery module or its heat exchange structure.

[0003] In the prior art, in order to ensure the cleanliness of the heating medium and protect downstream components, a filter device, such as a fixed filter screen, is often installed in the pipeline of the preheating circulation system (such as the oil pump inlet or the front end of the heater) to intercept solid impurities carried in the medium (such as particles falling off the inner wall of the pipeline, debris of sealing material, etc.).

[0004] However, as the system continues to operate, intercepted solid impurities accumulate on the filter screen, easily clogging its pores. Once clogging occurs, the flow resistance of the circulating medium increases sharply, and the flow rate and volume decrease significantly, leading to a decline in preheating efficiency, or even failure to achieve the expected heating effect. At this point, the preheating process must be interrupted to clean or replace the filter screen. However, since the filter screen is usually located inside the pipe, it is difficult to visually determine the degree of clogging and to control the timing of cleaning or replacement. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a filter device for preheating lithium battery modules, so as to solve the problem that the filter screen of the prior art is usually set inside the pipe, making it difficult to visually judge the degree of blockage of the filter pores and making it difficult to control the cleaning or replacement time.

[0006] This utility model is achieved through the following technical solution:

[0007] A filter device for preheating a lithium battery module includes a tube body and a filter screen for covering and sealing the inside of the tube body. The filter screen is slidably connected to the inner wall of the tube body along the axial direction of the tube body. An elastic support member is provided on the filter screen in the direction away from the input end of the tube body.

[0008] One end of the elastic support abuts against the filter screen, and the other end abuts against the inner wall of the tube output end;

[0009] A marking rod is rotatably connected to the outer wall of the tube, and the plane of the rotation trajectory is parallel to the axis of the tube.

[0010] A linkage component is provided between the marker rod and the filter screen. When the filter screen slides inside the tube, the linkage component drives the marker rod to rotate outside the tube.

[0011] Furthermore, an inner tube is provided inside the tube, and the outer wall of the inner tube is attached to the inner wall of the tube.

[0012] The filter screen covers and blocks the opening of the inner tube, and is detachably fixed to the inner tube.

[0013] Furthermore, a coaxial annular protrusion is provided on the inner wall of the tube output end, and the elastic support is a compression spring.

[0014] One end of the compression spring abuts against the output end of the inner tube, and the other end abuts against the annular protrusion.

[0015] Furthermore, a groove extending axially toward the tube body is provided on the outer wall of the inner tube, and the linkage component includes a gear and a rack disposed in the groove;

[0016] The axis of the gear is perpendicular to the axis of the tube body. One end of the gear facing away from the inner tube extends through the inner wall of the tube body and is fixedly connected to one end of the marking rod.

[0017] The rack meshes with the gear, extends axially toward the tube body, and is fixedly connected to the inner tube.

[0018] Furthermore, a groove is provided on the inner wall of the tube, and one end of the groove extends axially through the input end of the tube.

[0019] The outer wall of the inner tube is provided with a protruding strip that matches the sliding groove. The protruding strip is embedded in the sliding groove and slides in fit.

[0020] Furthermore, when the elastic support is in its naturally extended state, the free end of the marker rod points towards the input end of the tube, and the marker rod is parallel to the axis of the tube.

[0021] When the convex strip abuts against the end wall of the groove facing away from the input end of the tube, the free end of the marker rod points to the output end of the tube, and the marker rod is parallel to the axis of the tube.

[0022] Furthermore, a placement groove adapted to the shape of the filter screen is provided on the outer wall of the open end of the inner tube, and the placement groove is in communication with the interior of the inner tube.

[0023] The filter screen is inserted into the placement groove and covers and seals the opening of the inner tube.

[0024] Furthermore, an inspection port is provided on the outer wall of the tube to connect the inner and outer sides of the tube, and the inspection port is located on the movement trajectory of the placement groove;

[0025] The filter screen is smaller than the inspection port. The tube body is provided with a seal at the inspection port for sealing the inspection port and is fixedly connected in a detachable manner.

[0026] Furthermore, threaded holes are provided on both ends of the inspection port along the circumference of the pipe body, and two bolts corresponding to the two threaded holes are provided at both ends of the seal.

[0027] The threaded end of the bolt passes through the seal and is inserted into the threaded hole for connection via threaded engagement.

[0028] Furthermore, notches are provided on both sides of the opening of the placement slot.

[0029] The beneficial effects of this utility model are as follows:

[0030] This lithium battery module preheating filter device works by sliding a filter screen to a tube body and using an elastic support to provide elastic support for the filter screen. As the degree of blockage in the filter screen gradually increases, the thrust exerted by the heating medium on the filter screen also gradually increases, causing the filter screen to slide and press against the elastic support, thus sensing the degree of blockage. Simultaneously, a marker rod is installed outside the tube body, and a linkage component transfers the kinetic energy of the sliding filter screen to the marker rod, causing the marker rod to rotate synchronously outside the tube body, providing feedback on the degree of blockage in the filter screen. Technical personnel can easily determine the degree of blockage by visually observing the position or rotation angle of the marker rod.

[0031] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0033] Figure 2 This is a top view of an embodiment of the present utility model;

[0034] Figure 3 Bit Figure 2 Sectional view of AA (State 1);

[0035] Figure 4 Bit Figure 2 Sectional view of AA (State 2);

[0036] Figure 5 Bit Figure 2 Sectional view of BB;

[0037] Figure 6 This is an exploded view of an embodiment of the present utility model;

[0038] Figure 7 This is a three-dimensional structural diagram of the inner tube in an embodiment of the present utility model;

[0039] Figure 8 This is a three-dimensional structural diagram of the gear and marking rod in an embodiment of this utility model.

[0040] In the diagram: 1. Pipe body; 11. Annular ridge; 12. Slide groove; 13. Inspection port; 14. Threaded hole; 2. Filter screen; 3. Compression spring; 4. Marker rod; 5. Inner tube; 51. Groove; 52. Raised strip; 53. Placement slot; 531. Notch; 6. Gear; 7. Rack; 8. Seal; 81. Bolt. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0046] Please see Figure 1-8 This utility model provides a technical solution: a filter device for preheating lithium battery modules, including a tube body 1 and a filter screen 2 for covering and sealing the inside of the tube body 1. The filter screen 2 is slidably connected to the inner wall of the tube body 1 along the axial direction of the tube body 1. An elastic support member is provided on the filter screen 2 in the direction away from the input end of the tube body 1.

[0047] One end of the elastic support abuts against the filter screen 2, and the other end abuts against the inner wall of the output end of the tube body 1;

[0048] The outer wall of the tube 1 is rotatably connected to a marking rod 4, and the plane of the rotation trajectory is parallel to the axis of the tube 1.

[0049] A linkage component is provided between the marker rod 4 and the filter screen 2. When the filter screen 2 slides inside the tube body 1, the linkage component drives the marker rod 4 to rotate outside the tube body 1.

[0050] In this design, filter screen 2 is slidably connected to tube body 1, and elastic support is used to provide elastic support for filter screen 2. As the degree of blockage in the filter pores of filter screen 2 gradually increases, the thrust applied to filter screen 2 by the heating medium also gradually increases, causing filter screen 2 to slide and squeeze the elastic support to sense the degree of blockage in the filter pores. Simultaneously, a marker rod 4 is installed outside tube body 1, and a linkage component transfers the kinetic energy of the sliding filter screen 2 to the marker rod 4, causing the marker rod 4 to rotate synchronously with the outside of tube body 1, providing feedback on the degree of blockage in the filter pores. Technical personnel can easily and conveniently determine the degree of blockage in the filter pores simply by visually observing the position or rotation angle of the marker rod 4.

[0051] The filter screen 2 is made of a rigid material (metal or rigid plastic, optional), possessing a certain strength and heat resistance. It maintains structural stability within the tube body 1, ensuring that the outer contour of the filter screen 2 remains tightly fitted to the inner wall of the tube body 1 as it slides within the tube body 1, thus continuously performing filtration. Examples include 316L stainless steel or polyetheretherketone (PEEK) plastic.

[0052] One end of the tube body 1 facing away from the filter screen 2 is defined as the input end of the heating medium, and the other end is defined as the output end of the heating medium. The heating medium flows in the tube body 1 from the input end to the output end in a single direction, so as to block and capture solid impurities.

[0053] In use, the pipe body 1 is fixedly installed on the circulation pipeline (using a flange or welding), making this device a necessary link in the circulation of the heating medium (such as the oil pump inlet or the front end of the heater). The oil pump drives the heating medium to circulate. When the heating medium flows through the filter screen 2, the filter screen 2 obstructs and captures solid impurities. At the same time, the heating medium applies a thrust to the filter screen 2, causing it to slide. The elastic support is compressed and contracts to store energy, and through the linkage component, it drives the marker rod 4 to rotate, providing feedback on the degree of blockage of the filter holes on the filter screen 2 outside the pipe body 1. The principle is as follows:

[0054] When a small amount of solid impurities are captured on filter screen 2 (such as when filter screen 2 has just been cleaned or replaced), a large number of filter holes are unobstructed, and the heating medium can pass through smoothly. The thrust exerted by the heating medium on filter screen 2 is smaller, resulting in a smaller sliding distance of filter screen 2 and a smaller rotation angle of the marker rod 4.

[0055] When a large amount of solid impurities are captured on the filter screen 2 (such as after the filter screen 2 has been used for a period of time), a large number of filter holes become blocked, making it difficult for the heating medium to pass through. As a result, the heating medium exerts a greater thrust on the filter screen 2, causing the filter screen 2 to slide a greater distance and the marker rod 4 to rotate a greater angle.

[0056] Simultaneously, the operating status of the circulation system can also be obtained. For example, when the oil pump is working, it provides the power for the circulating flow of the heating medium. Part of the power of the heating medium is converted into a thrust on the filter screen 2 and stored in the elastic support, causing the marker rod 4 to rotate. When the oil pump stops working, the power disappears, the thrust of the heating medium on the filter screen 2 disappears, and the elastic support extends freely, pushing the filter screen 2 and the marker rod 4 back to their original positions.

[0057] In this embodiment: an inner tube 5 is provided inside the tube body 1, and the outer wall of the inner tube 5 is attached to the inner wall of the tube body 1;

[0058] The filter screen 2 covers and blocks the opening of the inner tube 5, and is detachably fixed to the inner tube 5.

[0059] In this design, the inner tube 5 serves as the support structure for the filter screen 2. By replacing the filter screen 2 in contact with the tube body 1 / elastic support, the probability of the filter screen 2 being squeezed and damaged / weared is reduced.

[0060] The filter screen 2 and the inner tube 5 are connected by a detachable fixing method (such as screw fixing, adhesive bonding, etc.), so that the filter screen 2 can be removed for cleaning / replacement. There is no need to replace the entire inner tube 5 and filter screen 2, which reduces the cost of use and maintenance.

[0061] In this embodiment: a coaxial annular protrusion 11 is provided on the inner wall of the output end of the tube body 1, and the elastic support is a compression spring 3;

[0062] One end of the compression spring 3 abuts against the output end of the inner tube 5, and the other end abuts against the annular protrusion 11.

[0063] In this design, the axis of the compression spring 3 is parallel to the axis of the tube 1, and the compression spring 3 provides axial support to the inner tube 5. The compression spring 3 can be made of Inconel X750 material, which has excellent resistance to stress relaxation, is resistant to coolant corrosion, can withstand high temperatures of 700℃ continuously, maintains constant stress, and can continuously provide support during the preheating process, meeting the usage requirements of the lithium battery module preheating system environment.

[0064] The inner diameter of the annular protrusion 11 is smaller than the outer diameter of the compression spring 3, which can prevent the compression spring 3 from moving out and falling off, thus providing stable support. In addition, the compression spring 3 is a mature existing technology with a high degree of standardization. It is only necessary to select the existing specifications that meet the usage requirements (by placing compression springs 3 of different specifications into the tube 1 and conducting a preheating test to select the specifications that meet the requirements), without the need to design the elasticity, parameters, etc. of the compression spring 3 separately, so it will not be described in detail here.

[0065] The relevant experiments are shown below:

[0066] Test equipment and conditions: The heating medium is 50% ethylene glycol aqueous solution (simulating lithium battery coolant), variable frequency oil pump (flow range 0.5-5L / min, accuracy ±0.1L / min), standard test dust (ISO 12103-A4, particle size 0-80μm), spring pressure sensor (range 0-50N, accuracy ±0.5%), angle meter (resolution 0.1°), 80℃ (constant temperature control), and filter screen 2 can be selected as HMC-50 (316L skeleton + PEEK filter membrane, filter pore size 50±4μm).

[0067] Experimental steps:

[0068] 1. Initial stage: Clean the filter screen 2 to ensure that the filter holes are 100% unobstructed, and reset the marker rod 4 to 0° (the marker rod 4 is parallel to the tube body 1 and the free end points to the input end); record the initial preload force F0 of the compression spring 3 = 5N (the spring free length is compressed by 10%).

[0069] 2. Staged loading test: Test dust is injected in stages, and data is recorded after each stage has been running stably for 10 minutes;

[0070]

[0071] 3. Critical state determination: When the marker rod 4 rotates to 180°, the elastic force increases by 300% compared to the initial value (F / F0=4), the flow rate decreases by ≥75%, and the marker rod 4 indicates that the filter screen needs to be cleaned / replaced.

[0072] 4. Reset Verification: After removing and cleaning the filter screen 2, reinstall it and confirm that the marker rod 4 is reset to 0° and the elastic force is restored to F0 = 5N.

[0073] In this embodiment: a groove 51 extending axially toward the tube body 1 is provided on the outer wall of the inner tube 5, and the linkage component includes a gear 6 and a rack 7 disposed in the groove 51;

[0074] The axis of the gear 6 is perpendicular to the axis of the tube body 1. One end of the gear 6 facing away from the inner tube 5 passes through the inner wall of the tube body 1 and extends out of the tube body 1, and is fixedly connected to one end of the marking rod 4.

[0075] The rack 7 meshes with the gear 6, and the rack 7 extends axially toward the tube body 1 and is fixedly connected to the inner tube 5.

[0076] In this design, a rotating shaft is coaxially fixedly connected to one end of gear 6 facing away from inner tube 5. The other end of the rotating shaft facing away from gear 6 extends through the inner wall of tube 1 and is fixedly connected to marking rod 4 (marking rod 4 is perpendicular to the rotating shaft). The two end faces of gear 6 are respectively attached to a plane of groove 51 along the radial direction of inner tube 5 and the inner wall of tube 1, which can restrict the axial movement of gear 6 and keep gear 6 and rack 7 in a stable meshing state.

[0077] The outer circular surface of the inner tube 5 facing away from the elastic support is in close contact with the inner circular surface of the tube body 1, which can restrict the heating medium from passing through the contact surface between the inner tube 5 and the tube body 1.

[0078] In this embodiment: a groove 12 is provided on the inner wall of the tube body 1, and one end of the groove 12 extends axially toward the tube body 1 and passes through the input end of the tube body 1;

[0079] The outer wall of the inner tube 5 is provided with a protrusion 52 that is adapted to the sliding groove 12. The protrusion 52 is embedded in the sliding groove 12 and slides in fit.

[0080] In this design, one end of the slide 12 passes through the input end of the pipe body 1, allowing the inner pipe 5 and the filter screen 2 to be slid out of the pipe body 1 as a whole for easy cleaning and replacement, and also for easy placement and installation of elastic support components (compression spring 3).

[0081] The protrusion 52 is embedded in the slide groove 12, which can restrict the inner tube 5 from rotating around the axis of the inner tube 5 in the tube body 1. The inner tube 5 can only slide along the axial direction, so that the gear 6 and the rack 7 can mesh stably.

[0082] In this embodiment: when the elastic support is in its naturally extended state, the free end of the marker rod 4 points to the input end of the tube body 1, and the marker rod 4 is parallel to the axis of the tube body 1;

[0083] When the protrusion 52 abuts against the end wall of the groove 12 facing away from the input end of the tube body 1, the free end of the marker rod 4 points to the output end of the tube body 1, and the marker rod 4 is parallel to the axis of the tube body 1.

[0084] In this scheme, initially (state one, such as...) Figure 3 As shown), when the oil pump is off and no preheating is being performed, the elastic support naturally extends, causing the marker rod 4 to point to the input end of the pipe body 1 and be parallel to the axis of the pipe body 1. This allows for a direct visual identification of the relative position of the marker rod 4 and the pipe body 1, and provides an analysis of the preheating system's operating status.

[0085] When the protruding strip 52 abuts against the end wall of the groove 12 facing away from the input end of the tube body 1 (state two, such as...) Figure 4 As shown, the inner tube 5 and filter screen 2 can no longer slide, increasing the deformation of the elastic support. The degree of blockage of the filter holes on the filter screen 2 at this time is defined as the maximum safety limit, reminding relevant technicians to clean and replace the filter screen 2 in time.

[0086] In this embodiment: a placement groove 53 adapted to the shape of the filter screen 2 is provided on the outer wall of the opening end of the inner tube 5, and the placement groove 53 is connected to the interior of the inner tube 5;

[0087] The filter screen 2 is inserted into the placement groove 53, and the filter screen 2 covers and seals the opening of the inner tube 5.

[0088] In this design, the filter screen 2 is embedded in the placement groove 53 with an interference fit, which restricts the heating medium from passing through the contact surface between the two, making the filter holes on the filter screen 2 the only channel for the heating medium.

[0089] When the filter screen 2 is fully embedded in the placement groove 53, the outer surface of the filter screen 2 facing away from the inner tube 5 abuts against the inner wall of the tube body 1, which can reduce the probability of the filter screen 2 vibrating and moving out under the impact of the heating medium, and continuously and stably carry out the collection and filtration work.

[0090] In this embodiment: an inspection port 13 is provided on the outer wall of the pipe body 1, which connects the inner and outer sides of the pipe body 1. The inspection port 13 is located on the movement trajectory of the placement groove 53.

[0091] The filter screen 2 is smaller than the inspection port 13. The tube body 1 is provided with a seal 8 at the inspection port 13 for sealing the inspection port 13 and is fixedly connected by a detachable method.

[0092] In this embodiment: threaded holes 14 are provided on both ends of the inspection port 13 along the circumferential direction of the pipe body 1, and two bolts 81 corresponding to the two threaded holes 14 are provided at both ends of the sealing strip 8;

[0093] The threaded end of the bolt 81 passes through the seal 8 and is inserted into the threaded hole 14 for connection via threaded engagement.

[0094] In this solution, in state two, the inspection port 13 is opposite to the placement slot 53, and the filter screen 2 can be taken out through the inspection port 13 without having to remove the entire device, making the operation simple and convenient.

[0095] Elastic strips (such as rubber strips, silicone strips, etc.) are provided on the contact surfaces of the seal 8 and the inspection port 13. By squeezing the seal 8 and the pipe body 1, the elastic strips are deformed and tightly fitted to the seal 8 and the pipe body 1 respectively, so as to achieve the purpose of sealing and keep the entire preheating system closed.

[0096] Two bolts 81 are used to fix and lock the two ends of the seal 8 to the pipe body 1, covering and sealing the pipe body 1, so that the two ends of the pipe body 1 serve as the only input / output channels.

[0097] In this embodiment, notches 531 are provided on both sides of the opening of the placement groove 53.

[0098] In this design, notch 531 is used to place clamps, such as needle-nose pliers or tweezers. By inserting the two clamping ends of the needle-nose pliers into the two notches 531 respectively, the filter screen 2 can be clamped and pulled out for cleaning.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A filter device for preheating a lithium battery module, comprising a tube (1) and a filter screen (2) for covering and sealing the inside of the tube (1), characterized in that: The filter screen (2) is slidably connected to the inner wall of the tube body (1) along the axial direction of the tube body (1), and an elastic support is provided on the filter screen (2) in the direction away from the input end of the tube body (1); One end of the elastic support abuts against the filter screen (2), and the other end abuts against the inner wall of the output end of the tube (1); The outer wall of the tube (1) is rotatably connected to a marking rod (4), and the plane of the rotation trajectory is parallel to the axis of the tube (1); A linkage component is provided between the marker rod (4) and the filter screen (2). When the filter screen (2) slides inside the tube (1), the linkage component drives the marker rod (4) to rotate outside the tube (1).

2. The filtration device for preheating lithium battery modules according to claim 1, characterized in that: The tube body (1) is provided with an inner tube (5), and the outer wall of the inner tube (5) is attached to the inner wall of the tube body (1); The filter screen (2) covers and blocks the opening of the inner tube (5) and is detachably fixed to the inner tube (5).

3. The filtration device for preheating lithium battery modules according to claim 2, characterized in that: The inner wall of the output end of the tube (1) is provided with a coaxial annular protrusion (11), and the elastic support is a compression spring (3). One end of the compression spring (3) abuts against the output end of the inner tube (5), and the other end abuts against the annular protrusion (11).

4. The filtration device for preheating lithium battery modules according to claim 2, characterized in that: The inner tube (5) has a groove (51) extending axially toward the tube body (1) on its outer wall. The linkage assembly includes a gear (6) and a rack (7) disposed in the groove (51). The axis of the gear (6) is perpendicular to the axis of the tube (1). One end of the gear (6) facing away from the inner tube (5) passes through the inner wall of the tube (1) and extends out of the tube (1), and is fixedly connected to one end of the marking rod (4). The rack (7) meshes with the gear (6), the rack (7) extends axially toward the tube body (1), and is fixedly connected to the inner tube (5).

5. The filter device for preheating lithium battery modules according to claim 2, characterized in that: A groove (12) is provided on the inner wall of the tube (1), and one end of the groove (12) extends axially toward the tube (1) and passes through the input end of the tube (1); The outer wall of the inner tube (5) is provided with a protrusion (52) that is adapted to the sliding groove (12). The protrusion (52) is embedded in the sliding groove (12) and slides in fit.

6. The filtration device for preheating lithium battery modules according to claim 5, characterized in that: When the elastic support is in its natural extended state, the free end of the marker rod (4) points to the input end of the tube body (1), and the marker rod (4) is parallel to the axis of the tube body (1); When the protrusion (52) abuts against the end wall of the groove (12) facing away from the input end of the tube body (1), the free end of the marker rod (4) points to the output end of the tube body (1), and the marker rod (4) is parallel to the axis of the tube body (1).

7. The filtration device for preheating lithium battery modules according to claim 6, characterized in that: The outer wall of the opening end of the inner tube (5) is provided with a placement groove (53) that matches the shape of the filter screen (2), and the placement groove (53) is connected to the interior of the inner tube (5). The filter screen (2) is inserted into the placement groove (53) and the filter screen (2) covers and seals the opening of the inner tube (5).

8. The filtration device for preheating lithium battery modules according to claim 7, characterized in that: The outer wall of the tube (1) is provided with an inspection port (13) that connects the inner and outer sides of the tube (1), and the inspection port (13) is located on the movement trajectory of the placement groove (53); The filter screen (2) is smaller than the size of the inspection port (13). The tube body (1) is provided with a seal (8) at the inspection port (13) for sealing the inspection port (13) and is fixedly connected by a detachable method.

9. The filter device for preheating lithium battery modules according to claim 8, characterized in that: The inspection port (13) has threaded holes (14) on both ends of the pipe body (1) along the circumferential direction. The seal (8) has two bolts (81) at both ends that correspond one-to-one with the two threaded holes (14). The threaded end of the bolt (81) passes through the seal (8) and is inserted into the threaded hole (14) for connection through threaded engagement.

10. The filter device for preheating lithium battery modules according to claim 7, characterized in that: The placement groove (53) has notches (531) on both sides of the opening opposite to each other.

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