Lithium ion battery thickness monitoring device

Abstract

The embodiment of the utility model provides a lithium ion battery thickness monitoring device which comprises a mounting seat, and a displacement sensor is detachably mounted on the mounting seat; spring telescopic rods are detachably installed on the two sides of the installation base respectively and are perpendicular to the side face of the installation base. The displacement sensor is detachable, sensors in different states can be replaced to test thickness changes of different types of batteries, effective data support is provided for restraining force in the charging and discharging process, the installation base and the displacement sensor are fixed through the spring telescopic rod, the universality is high, and the reliability is high. The device is suitable for soft package and square aluminum shell battery cells with different thicknesses, different devices and different types, and is simple in structure and convenient to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery monitoring, in particular to a lithium ion battery thickness monitoring device. BACKGROUND

[0002] In recent years, with the vigorous development of new energy industry and the increasing demand for efficient and sustainable energy solutions, the performance standards and industry specifications of lithium ion batteries as core energy storage components are becoming more stringent and refined. Among them, the thickness of lithium ion battery as a key performance indicator has a direct impact on the energy density, cycle life and safety of the battery. During the battery module Pack packaging process, if the thickness consistency of each single battery is poor, it will directly lead to the accumulation of size deviation, affecting the overall assembly accuracy and performance of the module, and it is difficult to meet the strict requirements of high-end application fields.

[0003] In addition, in the production and quality detection process of lithium ion batteries, charge and discharge test is an indispensable link. In this process, accompanied by complex electrochemical reactions, the embedding and migration of lithium ions between the positive and negative electrodes not only drives the storage and release of energy, but also accompanies the generation of gas, which challenges the physical structure stability of the battery. Specifically, the size of the battery may change in the length and width directions, and the battery may wrinkle due to inconsistent deformation in the thickness direction, which not only affects the electrochemical performance of the battery, but also may shorten its service life.

[0004] In order to alleviate this phenomenon, the industry generally adopts the method of applying restraint force to the battery during formation and capacity test, aiming to guide the stress release direction of the battery during charge and discharge process, so as to control its deformation. However, the existing restraint technology has obvious shortcomings. Specifically, the usual practice is to place a certain number of batteries in a specially designed tray, and by applying pressure to one end of the tray, the transmission of the interlayer plate of the battery makes each battery subject to a certain degree of restraint. However, the limitation of this method is that the pressure sensor is usually only set on one side of the restraint device, lacking direct monitoring of the pressure on each battery, and also failing to monitor the change of battery thickness in real time during the charge and discharge process. The lack of such monitoring mechanism makes it impossible to ensure that the pressure on each battery is uniform and reasonable, and thus it is difficult to ensure the consistency of the battery thickness, ultimately affecting the overall performance and reliability of the battery module. UTILITY MODEL CONTENT

[0005] The embodiment of the present application provides a lithium ion battery thickness monitoring device, which fixes the monitoring device between the adjacent two battery interlayer plates through the spring telescopic rod, monitors the change of the distance between the interlayer plates of the battery during the charge and discharge process through the displacement sensor, realizes the thickness monitoring of the battery, and solves the problem that the prior art cannot directly monitor each battery.

[0006] In one aspect, the embodiment of the present application provides a lithium ion battery thickness monitoring device, comprising a mounting seat, and a displacement sensor detachably mounted on the mounting seat;

[0007] The displacement sensor is electrically connected to a data processor;

[0008] Two sides of the mounting seat are detachably mounted with spring telescopic rods, and the spring telescopic rods are perpendicular to the side surface of the mounting seat.

[0009] In one possible implementation, the mounting seat is provided with a clamping groove on each of the front and rear surfaces, and each clamping groove clamps one displacement sensor.

[0010] In one possible implementation, one end of each screw column is fixedly connected to the two sides of the mounting seat, and one end of the spring telescopic rod is threadedly connected to the corresponding screw column.

[0011] In one possible implementation, the spring telescopic rod comprises a first cylinder body and a second cylinder body which are movably connected, an inner thread is arranged at one end of the inner wall of the first cylinder body, and the first cylinder body is threadedly connected to the corresponding screw column through the inner thread.

[0012] The second cylinder body has a double-layer sleeve structure and is open at one end, the first cylinder body is inserted into the second cylinder body, a first spring is detachably mounted in the first cylinder body, and a second spring is detachably mounted in the second cylinder body.

[0013] In one possible implementation, a first protruding column is fixedly mounted on one end of the inner wall of the first cylinder body close to the screw column, and the first protruding column is inserted into the gap of the first spring.

[0014] A second protruding column is fixedly mounted on one end of the inner wall of the second cylinder body away from the first cylinder body, and the second protruding column is inserted into the gap of the second spring.

[0015] In one possible implementation, a U-shaped groove is arranged on the outer periphery of the second cylinder body, two ends of the U-shaped groove are provided with sliding grooves perpendicular to the U-shaped groove, the U-shaped groove and the sliding grooves are in communication with the inside and outside of the second cylinder body, and the sliding grooves are distributed along the axial direction of the second cylinder body.

[0016] A sliding block is fixedly mounted on one end of the outer periphery of the first cylinder body away from the screw column, and the sliding block is located in the sliding groove or the U-shaped groove.

[0017] In one possible implementation, an anti-skid pad is fixedly mounted on one end of the spring telescopic rod away from the mounting seat.

[0018] In one possible implementation, the clamping groove has a T-shaped structure.

[0019] In a feasible implementation, the resolution of the displacement sensor is 0.001 mm.

[0020] In another aspect, the embodiment of the present application provides another lithium ion battery thickness monitoring device, comprising a mounting seat, wherein a displacement sensor is detachably mounted on the mounting seat;

[0021] The displacement sensor is connected to a data processor through a data transmission line.

[0022] The two sides of the mounting seat are detachably mounted with spring telescopic rods, and the spring telescopic rods are perpendicular to the side surface of the mounting seat.

[0023] The lithium ion battery thickness monitoring device provided by the embodiment of the present application is detachable, and different types of sensors can be replaced to test the thickness changes of different types of batteries, thereby providing effective data support for the restraint force in the charging and discharging process. The mounting seat and the displacement sensor are fixed through the spring telescopic rods, which has strong versatility and is suitable for different thicknesses, different equipment, different types of soft packages and square aluminum shell battery cells, and has simple structure and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the lithium ion battery thickness monitoring device provided by an embodiment of the present application;

[0025] Figure 2 is Figure 1 a structural schematic diagram of the mounting seat in the embodiment.

[0026] MARKED FOR EXPLANATION:

[0027] 1-mounting seat; 2-displacement sensor; 3-spring telescopic rod; 4-clamping groove; 5-stud; 6-anti-skid pad;

[0028] 7-data processor; 8-data transmission line;

[0029] 31-first cylinder; 32-second cylinder; 33-first spring; 34-second spring; 35-first protruding column; 36-second protruding column; 37-U-shaped groove; 38-sliding groove; 39-sliding block. DETAILED DESCRIPTION

[0030] In order to enable personnel in the technical field to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0031] Figure 1 is a structural schematic diagram of a lithium ion battery thickness monitoring device provided by an embodiment of the present application; Figure 2 is Figure 1 is a structural schematic diagram of a mounting seat. Referring to Figure 1 and Figure 2 , the present embodiment provides a lithium ion battery thickness monitoring device, which comprises a mounting seat 1, and a displacement sensor 2 is detachably mounted on the mounting seat 1;

[0032] Two sides of the mounting seat 1 are respectively detachably mounted with spring telescopic rods 3, and the spring telescopic rods 3 are perpendicular to the side surface of the mounting seat 1.

[0033] It is easy to understand that, in use, the device is fixed between two adjacent cell layer plates, at this time, both spring telescopic rods 3 are in a contracted state, and the displacement sensor 2 is powered on to work, so as to collect the change of the spacing between the two adjacent cell layer plates during the charging and discharging process, and to monitor the thickness change of the cell under different charging and discharging states in real time.

[0034] In some specific examples, the resolution of the displacement signal monitored by the displacement sensor 2 is 0.001 mm.

[0035] In the above embodiment, the displacement sensor 2 is detachable, and different types of sensors can be replaced to test the thickness change of different types of batteries, thereby providing effective data support for the restraint force during the charging and discharging process. The mounting seat 1 and the displacement sensor 2 are fixed through the spring telescopic rods 3, which has strong versatility and is suitable for different thicknesses, different equipment, different types of soft packages and square aluminum shell cells, and has a simple structure and convenient operation.

[0036] In some examples, the front and rear surfaces of the mounting seat 1 are both provided with clamping grooves 4, and each clamping groove 4 clamps one displacement sensor 2.

[0037] In the above embodiment, the clamping grooves 4 greatly improve the installation convenience of the displacement sensor 2. Users do not need complex fixing steps or additional installation tools, but only need to simply align the displacement sensor 2 with the clamping grooves 4 and press gently, so as to realize stable installation. This not only saves installation time, but also reduces the operation difficulty, so that non-professionals can easily operate.

[0038] Secondly, the design of the clamping grooves 4 also enhances the stability and reliability of the displacement sensor 2. Due to the close fit between the clamping grooves 4 and the displacement sensor 2, the displacement sensor 2 is not easy to loosen or displace during work, thereby ensuring the accuracy and consistency of the measurement data. This is particularly important for application scenarios that require long-term and high-precision monitoring of battery thickness.

[0039] In addition, by providing the clamping grooves 4 on both the front and rear surfaces of the mounting base 1, we also provide users with more installation options. Users can flexibly choose to install the displacement sensor 2 on the front side or the rear side according to actual needs and the layout of the battery module, or even install it on both sides at the same time to achieve more comprehensive monitoring. This design not only improves the flexibility of the device, but also provides users with a more personalized user experience.

[0040] In some examples, one end of each of the mounting base 1 is fixedly connected to one end of a corresponding threaded stud 5, and one end of the spring telescopic rod 3 is threadedly connected to the corresponding threaded stud 5.

[0041] It is easy to understand that the threaded stud 5 is provided with external threads, and one end of the spring telescopic rod 3 is provided with internal threads, which can be threadedly connected.

[0042] In the above embodiment, the threaded connection method is not only simple and easy to implement, but also has excellent stability and reliability. Users only need to screw the threaded stud 5 into the spring telescopic rod 3 to achieve firm installation without the need for additional fixing tools or steps.

[0043] In addition, another significant advantage of threaded connection is its adjustability. Users can easily adjust the distance between the spring telescopic rod 3 and the mounting base 1 according to actual needs and the distance between the cell layer plates to ensure that the spring telescopic rod 3 is tightly attached to the cell layer plates. This design not only improves the adaptability and flexibility of the device, but also provides users with a more convenient installation and debugging experience.

[0044] In some examples, the spring telescopic rod 3 includes a first cylinder 31 and a second cylinder 32 connected movably, the inner wall of the first cylinder 31 is provided with internal threads at one end, and the first cylinder 31 is threadedly connected to the corresponding threaded stud 5 through the internal threads;

[0045] The second cylinder 32 has a double-sleeve structure and is open at one end, the first cylinder 31 is inserted into the second cylinder 32, the first spring 33 is detachably installed inside the first cylinder 31, and the second spring 34 is detachably installed inside the second cylinder 32.

[0046] It should be noted that the second spring 34 is arranged between the double sleeves of the second cylinder 32, one end of the second spring 34 facing the first cylinder 31 is in contact with the end face of the first cylinder 31, and one end of the first spring 33 facing the second cylinder 32 is in contact with the end face of the inner sleeve of the second cylinder 32.

[0047] Specifically, the spring telescopic rod 3 is composed of a first cylinder 31 and a second cylinder 32 connected movably. The inner wall of the first cylinder 31 is provided with internal threads at one end, which enables the first cylinder 31 to be threadedly connected with the corresponding stud 5. This connection is stable and reliable, ensuring the secure installation of the spring telescopic rod 3 on the mounting base 1.

[0048] The second cylinder 32 adopts a double-layer sleeve structure and is open at one end, so that the first cylinder 31 can be smoothly inserted. This double-layer sleeve design not only increases the strength and stability of the second cylinder 32, but also provides convenience for the installation and removal of the internal spring.

[0049] Inside the first cylinder 31, a first spring 33 is detachably installed. The design of this spring enables the first cylinder 31 to produce elastic deformation when subjected to external force, thereby adapting to different spacings between the cell layer plates. At the same time, the detachability of the first spring 33 also facilitates users to replace or adjust according to actual needs.

[0050] Inside the second cylinder 32, a second spring 34 is also detachably installed. This spring works together with the first spring 33 to further enhance the elasticity and adaptability of the spring telescopic rod 3. When the spacing between the cell layer plates changes, the two springs can work cooperatively to ensure that the spring telescopic rod 3 always closely fits the cell layer plates.

[0051] In addition, this double-layer sleeve structure and double-spring design also enable the spring telescopic rod 3 to disperse stress and reduce the risk of damage when subjected to a larger external force. At the same time, due to the detachability of the two springs, users can flexibly adjust according to actual factors such as the weight and spacing of the cell layer plates to meet the application needs in different scenarios.

[0052] In some examples, a first protruding column 35 is fixedly installed on the inner wall of the first cylinder 31 near the end of the stud 5, and the first protruding column 35 is inserted into the gap of the first spring 33;

[0053] A second protruding column 36 is fixedly installed on the inner wall of the second cylinder 32 away from the first cylinder 31, and the second protruding column 36 is inserted into the gap of the second spring 34.

[0054] It is worth noting that the ends of the first spring 33 and the second spring 34 are open structures. When installing the first spring 33 and the second spring 34, the first spring 33 is placed into the first cylinder 31 until the end of the first spring 33 contacts the first protruding column 35. Then, the first spring 33 is rotated until the first protruding column 35 is inserted into the gap of the first spring 33, and the inner end of the first spring 33 contacts the outer end of the stud 5. Similarly, the second spring 34 is installed. When disassembling the first spring 33 and the second spring 34, the first spring 33 and the second spring 34 are rotated in the opposite direction until they are separated from the first protruding column 35 and the second protruding column 36. Then, the first spring 33 and the second spring 34 can be pulled out.

[0055] Specifically, the inner wall of the first cylinder 31 near one end of the stud 5 is fixedly installed with a first protruding column 35. This protruding column is ingeniously inserted into the gap of the first spring 33, playing a positioning and supporting role. It ensures that the first spring 33 does not deviate or fall off during installation and use, thereby ensuring the reliability and stability of the spring telescopic rod 3.

[0056] Similarly, the inner wall of the second cylinder 32 away from one end of the first cylinder 31 is also fixedly installed with a second protruding column 36. This protruding column is also inserted into the gap of the second spring 34, playing a similar positioning and supporting role. Through the fixed installation of the second protruding column 36, the second spring 34 can also maintain a stable position and form during installation and use, further enhancing the overall stability of the spring telescopic rod 3.

[0057] In addition, the design of the first protruding column 35 and the second protruding column 36 also allows the spring telescopic rod 3 to more evenly distribute stress when subjected to external forces. This reduces the risk of damage to the spring telescopic rod 3 due to stress concentration during long-term use, prolonging its service life.

[0058] More importantly, this design also improves the compactness and functionality of the spring telescopic rod 3. Due to the fixed installation of the first protruding column 35 and the second protruding column 36, the overall structure of the spring telescopic rod 3 is more compact and stable, and is easy to install and maintain. At the same time, this design also facilitates users to replace or adjust the spring to meet the application requirements in different scenarios.

[0059] In some examples, a U-shaped groove 37 is opened on the outer periphery of the second cylinder 32, and perpendicular to the U-shaped groove 37, two sliding grooves 38 are opened at both ends of the U-shaped groove 37. The U-shaped groove 37 and the sliding grooves 38 are in communication with the inside and outside of the second cylinder 32, and the sliding grooves 38 are distributed along the axial direction of the second cylinder 32.

[0060] The outer periphery of the first cylinder body 31 is fixedly installed with a sliding block 39 at one end away from the stud 5, and the sliding block 39 is located in the sliding groove 38 or the U-shaped groove 37.

[0061] It is easy to understand that when connecting the first cylinder body 31 and the corresponding second cylinder body 32, the sliding block 39 of the first cylinder body 31 is moved along the sliding groove 38 of the open end of the second cylinder body 32 until it enters the other sliding groove 38 after passing around the U-shaped groove 37. Under the action of no external force, the sliding block 39 cannot be reversed out of the second cylinder body 32 along its entry path, so that the disassembly and assembly of the first cylinder body 31 and the second cylinder body 32 can be easily realized. The sliding groove 38 near the closed end of the second cylinder body 32 has a certain length, which can meet the extension and retraction requirements of the spring telescopic rod 3.

[0062] In the above embodiment, the outer periphery of the sliding block 39 is in contact with the inner wall of the sliding groove 38 and the U-shaped groove 37, and the sliding block 39 can move along the sliding groove 38 and the U-shaped groove 37. Through the cooperation of the three, the replacement of the first spring 33 and the second spring 34 inside the first cylinder body 31 and the second cylinder body 32 can be easily realized, and the operation difficulty is low. During use, the spring telescopic rod 3 is subjected to the radial force applied by the cell layer plate, which cannot make the sliding block 39 pass around the U-shaped groove 37 and separate from the sliding groove 38, and there is no problem of separation of the first cylinder body 31 and the second cylinder body 32 during use.

[0063] In some examples, the spring telescopic rod 3 is fixedly installed with an anti-skid pad 6 at one end away from the mounting seat 1.

[0064] Specifically, the anti-skid pad 6 is mainly used to increase the friction between the spring telescopic rod 3 and the cell layer plate, so as to prevent the device from sliding or falling off due to the expansion or contraction of the cell during the charging and discharging process of the battery. This design not only ensures that the monitoring device can be stably fixed between the cell layer plates, but also improves the accuracy and reliability of the measurement.

[0065] The material of the anti-skid pad 6 is usually selected to have high friction coefficient and wear resistance, such as rubber, silicone or special synthetic materials. These materials not only have good anti-skid performance, but also can maintain stable physical and chemical properties during long-term use, and are not easy to age or deform.

[0066] In addition, the design of the anti-skid pad 6 can also be customized according to the surface material and shape of the cell layer plate. For example, for the cell layer plate with a relatively smooth surface, an anti-skid pad 6 with stronger adhesion can be selected; and for the cell layer plate with irregular shape or surface protrusions, an anti-skid pad 6 with corresponding grooves or adaptive shape can be designed to ensure its close fit with the cell layer plate.

[0067] The fixed installation mode of the non-slip mat 6 also needs to consider its stability and easy replacement features. Generally, the non-slip mat 6 can be fixed at the end of the spring telescopic rod 3 by adhesives, threaded connections, or buckles, etc. These fixing methods not only ensure that the non-slip mat 6 will not fall off or displace during use, but also facilitate the user to replace or adjust when needed.

[0068] Referring to Figure 2 As shown in some examples, the clamping groove 4 is a T-shaped structure.

[0069] It is easy to understand that since the displacement sensor 2 is clamped with the clamping groove 4, the shape of the displacement sensor 2 is also T-shaped. If the displacement sensor 2 does not meet the above conditions, a clamping seat can be fixedly installed on the back of the displacement sensor 2 to insert the horizontal part of the T-shaped structure, and the displacement sensor 2 is located in the vertical part of the T-shaped structure or protrudes from the T-shaped structure.

[0070] In the above embodiment, when the displacement sensor 2 is inserted into the clamping groove 4 of the T-shaped structure, the friction between the displacement sensor 2 and the clamping groove 4 is large, thereby achieving the fixation of the displacement sensor 2. The disassembly is relatively convenient. Since the force direction of the device during use mainly comes from the axial direction of the spring telescopic rod 3, there is no force perpendicular to the spring telescopic rod 3, and the displacement sensor 2 has no risk of falling off.

[0071] In some examples, the displacement sensor 2 is electrically connected to the data processor 7.

[0072] It is easy to understand that the displacement sensor 2 is electrically connected to the data processor 7 through a cable or wireless signal transmission. The displacement sensor 2 is responsible for real-time monitoring of the thickness change of the lithium ion battery and converting these changes into electrical signals. The electrical signals are then transmitted to the data processor 7 for further processing and analysis.

[0073] In the above embodiment, the cooperation between the displacement sensor 2 and the data processor 7 is the key to the normal operation of the lithium ion battery thickness monitoring device. When the displacement sensor 2 detects the thickness change of the lithium ion battery, it will immediately convert these changes into electrical signals and transmit them to the data processor 7. The data processor 7 will quickly process and analyze these signals to obtain accurate monitoring results. This cooperation not only improves the accuracy and reliability of the monitoring, but also enables the user to timely understand the status of the lithium ion battery and take appropriate measures to ensure the safety and stability of the battery.

[0074] On the other hand, the embodiment of the present application provides another lithium ion battery thickness monitoring device, which comprises a mounting seat 1, and a displacement sensor 2 is detachably mounted on the mounting seat 1.

[0075] The displacement sensor 2 is connected to a data processor 7 through a data transmission line 8.

[0076] The mounting seat 1 is detachably mounted with spring telescopic rods 3 on both sides, and the spring telescopic rods 3 are perpendicular to the side surface of the mounting seat 1.

[0077] In the above embodiment, the displacement sensor 2 is detachable, and different state sensors can be replaced to test the thickness change of different types of batteries, to provide effective data support for the restraint force in the charging and discharging process. The mounting seat 1 and the displacement sensor 2 are fixed through the spring telescopic rods 3, which has strong versatility and is suitable for soft packages, square aluminum shell battery cells with different thicknesses, different equipment and different types. Moreover, the structure is simple and the operation is convenient. The data transmission line 8 accurately transmits the data collected by the displacement sensor 2 to the data processor 7, and the data processor 7 processes and analyzes the data signal, so that the thickness change value of the lithium ion battery can be obtained.

[0078] It is easy to understand that, on the basis of the several embodiments provided in the present application, the skilled in the art can combine, split, recombine, etc. to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

[0079] The above specific embodiments further explain the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific embodiment of the present application, and is not used to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A lithium-ion battery thickness monitoring device, characterized by, The utility model provides a displacement sensor mounting seat, including mounting seat (1), detachable mounting displacement sensor (2) on mounting seat (1), The displacement sensor (2) is electrically connected to a data processor (7); Two sides of the mounting seat (1) are detachably mounted with spring telescopic rods (3) respectively, and the spring telescopic rods (3) are perpendicular to the side surfaces of the mounting seat (1).

2. The lithium-ion battery thickness monitoring device of claim 1, wherein, The mounting seat (1) is provided with clamping grooves (4) on the front and back surfaces, and each clamping groove (4) clamps one displacement sensor (2).

3. The lithium-ion battery thickness monitoring device of claim 1, wherein, One end of each screw post (5) is fixedly connected to the two sides of the mounting seat (1), and one end of each spring telescopic rod (3) is screwed with the corresponding screw post (5).

4. The lithium-ion battery thickness monitoring device of claim 3, wherein, The spring telescopic rod (3) comprises a first cylinder (31) and a second cylinder (32) connected movably, the inner wall of the first cylinder (31) is provided with internal threads at one end, and the first cylinder (31) is screwed with the corresponding screw post (5) through the internal threads; The second cylinder (32) is a double-layer sleeve structure and is open at one end, the first cylinder (31) is inserted into the second cylinder (32), a first spring (33) is detachably mounted in the first cylinder (31), and a second spring (34) is detachably mounted in the second cylinder (32).

5. The lithium-ion battery thickness monitoring device of claim 4, wherein, A first protruding column (35) is fixedly mounted on the inner wall of the first cylinder (31) at one end close to the screw post (5), and the first protruding column (35) is inserted into the gap of the first spring (33); A second protruding column (36) is fixedly mounted on the inner wall of the second cylinder (32) at one end away from the first cylinder (31), and the second protruding column (36) is inserted into the gap of the second spring (34).

6. The lithium-ion battery thickness monitoring device of claim 4, wherein, A U-shaped groove (37) is formed in the outer periphery of the second cylinder (32), two ends of the U-shaped groove (37) are provided with sliding grooves (38) perpendicular to the U-shaped groove (37), the U-shaped groove (37) and the sliding grooves (38) are in communication with the inside and outside of the second cylinder (32), and the sliding grooves (38) are distributed along the axial direction of the second cylinder (32); A sliding block (39) is fixedly mounted on the outer periphery of the first cylinder (31) at one end away from the screw post (5), and the sliding block (39) is located in the sliding groove (38) or the U-shaped groove (37).

7. The lithium-ion battery thickness monitoring device of any one of claims 1-6, wherein, A non-slip pad (6) is fixedly mounted on one end of the spring telescopic rod (3) away from the mounting seat (1).

8. The lithium-ion battery thickness monitoring device of claim 2, wherein, The clamping groove (4) has a T-shaped structure.

9. The lithium-ion battery thickness monitoring device of any one of claims 1-3, wherein, The resolution of the displacement sensor (2) is 0.001 mm.

10. A lithium-ion battery thickness monitoring device, characterized by, The utility model provides a displacement sensor mounting seat, including mounting seat (1), detachable mounting displacement sensor (2) on mounting seat (1), The displacement sensor (2) is connected to a data processor (7) through a data transmission line (8); Two sides of the mounting seat (1) are detachably mounted with spring telescopic rods (3) respectively, and the spring telescopic rods (3) are perpendicular to the side surfaces of the mounting seat (1).

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