Battery cell thickness gauge

Abstract

The application relates to the technical field of measuring devices, and discloses a battery core thickness gauge, which comprises a mounting portion, at least one guide rod, a sliding frame and a telescopic pressure applying assembly. The guide rod is arranged on the mounting portion, and an air floating bearing is arranged on the guide rod in a sliding mode. The sliding frame is connected with the air floating bearing, and a detection head is arranged at the first end of the guide rod in the axial direction of the guide rod. The driving end of the telescopic pressure applying assembly is connected with the sliding frame, so that the sliding frame can reciprocate along the axial direction of the guide rod, the accuracy of measurement can be improved, and the operation is simplified.

Description

Technical Field

[0001] This application relates to the field of measuring equipment technology, specifically to a battery cell thickness gauge. Background Technology

[0002] During the manufacturing process of soft-pack lithium batteries, uneven internal electrolyte or uneven aluminum-plastic film may occur, resulting in a high defect rate during thickness measurement. Furthermore, the thickness cannot be directly read by vision or measuring mechanisms. It is necessary to first apply a rated vertical pressure to the flat surface of the lithium battery itself, and then complete the measurement after the surface is flat without damaging the battery.

[0003] In related technologies, battery thickness measurement devices often use cylinders connected to rope weights. The measuring platform applies vertical pressure to the surface of the battery cell along the guide rail in the vertical direction, and then measures the thickness of the battery cell through a distance sensor. However, during the measurement process, the rope weights need to be added in combination, and the rope weights will shake during operation, as well as the friction of the rope, resulting in poor measurement accuracy. Utility Model Content

[0004] This application provides a cell thickness gauge that can improve measurement accuracy.

[0005] On the one hand, this application provides a cell thickness gauge, including a mounting part, at least one guide rod, a sliding frame and a telescopic pressure assembly; the specific solution is as follows.

[0006] A guide rod is mounted on the mounting part, and an air bearing is slidably mounted on the guide rod; a sliding frame is connected to the air bearing, and a detection head is provided at the first end of the sliding frame along the axial direction of the guide rod; the driving end of the telescopic pressure assembly is connected to the sliding frame to drive the sliding frame to reciprocate along the axial direction of the guide rod.

[0007] Beneficial effects: The drive end of the telescopic pressure component is connected to the sliding frame, which is slidably connected to the guide rod via an air bearing. The telescopic pressure component directly drives the sliding frame to apply a set pressure to the battery cell under test, thus performing thickness testing. Since the telescopic pressure component directly generates pressure, it improves the stability of the pressure applied to the battery cell, thereby improving the accuracy of thickness measurement. It avoids the use of wobbly components such as linear weights, thus preventing the measuring equipment from shaking or the pressure from being unstable, which could lead to large measurement errors.

[0008] Meanwhile, since the sliding frame and the guide rod are connected by an air bearing, the air bearing can reduce the friction between the sliding frame and the guide rod, thereby further improving the accuracy of pressure application to the battery cell under test and further improving the accuracy of battery cell thickness measurement.

[0009] In one optional embodiment, there are two guide rods arranged in parallel, each guide rod is provided with a plurality of air bearings, the plurality of air bearings on each guide rod are spaced apart, and are all connected to the sliding frame.

[0010] In an optional embodiment, the telescopic pressure assembly is a linear motor, the drive end of which is connected to the side of the sliding frame along a first direction, wherein the first direction is perpendicular to the axial direction of the guide rod.

[0011] In an alternative embodiment, the cell thickness gauge further includes a reset component, one end of which is connected to the sliding frame and the other end of which is connected to the mounting portion, the reset component extending axially along the guide rod.

[0012] In an optional embodiment, the cell thickness gauge further includes a gas distribution plate disposed on the mounting portion. The gas distribution plate is provided with an air inlet and a plurality of air outlets. The air inlet is used to communicate with a gas supply device, and the plurality of air outlets are respectively connected to a plurality of air bearings.

[0013] In an optional embodiment, the gas distribution plate is provided with a limiting part, which can limit the second end of the sliding frame along the axial direction of the guide rod.

[0014] In an optional embodiment, the cell thickness gauge further includes a magnetic grating base ruler and a magnetic grating head. The magnetic grating head is disposed on the mounting part, and the magnetic grating base ruler is disposed on the sliding frame. The magnetic grating head cooperates with the magnetic grating base ruler to measure the displacement of the sliding frame.

[0015] In an optional embodiment, the cell thickness gauge further includes a reset sensor and a sensing head. The reset sensor is disposed on the mounting portion, and the sensing head is disposed on the sliding frame. When the sliding frame is in its initial position, the reset sensor can detect the sensing head.

[0016] In an optional embodiment, the cell thickness gauge further includes a protective box, the mounting part being one side inside the protective box, the protective box having an opening, the sliding frame including a frame body and the detection head, the detection head being located outside the protective box, and a portion of the frame body penetrating through the opening and connected to the detection head.

[0017] In an optional embodiment, the cell thickness gauge further includes a mounting frame and a testing platform, the mounting part being connected to the mounting frame, and the testing platform being used to place the cell to be tested. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a front view of a cell thickness gauge according to an embodiment of this application;

[0020] Figure 2 This is a front view of a battery cell thickness gauge according to an embodiment of this application, with a portion of the protective box removed.

[0021] Figure 3 A partial front view of the protective box of another cell thickness gauge according to an embodiment of this application is provided;

[0022] Figure 4 A partial front view of the protective box of another cell thickness gauge according to an embodiment of this application is provided;

[0023] Figure 5 This is a front view of the frame body of a cell thickness gauge according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] X, first direction;

[0026] 1. Mounting section; 2. Guide rod; 3. Air bearing; 4. Sliding frame; 5. Telescopic pressure assembly; 6. Reset component; 7. Air distribution plate; 8. Magnetic grating base scale; 9. Magnetic grating head; 10. Reset sensor; 11. Sensor head; 12. Protective box; 13. Fixing frame; 14. Testing table;

[0027] 401. Detection head; 402. Frame body; 501. Drive end; 701. Air inlet; 702. Air outlet; 703. Limiting part; 1201. Opening. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. The terms "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where an acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality can be, for example, a difference between the two equal items being less than or equal to 5% of either one. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In related technologies, during the manufacturing process of soft-pack lithium batteries, there may be uneven internal electrolyte or uneven aluminum-plastic film. The defect rate is high during thickness measurement, and it cannot be directly read by vision or measurement mechanism. It is necessary to apply a rated vertical pressure to the flat surface of the lithium battery itself first, and then complete the measurement after the surface is flat without damaging the battery.

[0031] In related technologies, battery thickness measurement devices often use cylinders connected to rope weights. The measuring platform applies vertical pressure to the surface of the battery cell along the guide rail in the vertical direction, and then measures the thickness of the battery cell through a distance sensor. However, during the measurement process, the rope weights need to be added in combination, and the rope weights will shake during operation, as well as the friction of the rope, resulting in poor measurement accuracy.

[0032] To address the aforementioned technical problems, this application provides a cell thickness gauge that can improve measurement accuracy.

[0033] The following is combined Figures 1 to 5 This describes an embodiment of the present application.

[0034] According to embodiments of this application, in one aspect, a cell thickness gauge is provided, such as... Figures 1 to 2 and Figure 4 As shown, it includes a mounting part 1, at least one guide rod 2, a sliding frame 4, and a telescopic pressure application assembly 5; the specific scheme is as follows.

[0035] like Figure 2 As shown, the mounting part 1 can be a mounting plate, a mounting bracket, or a housing, etc. Of course, it is not limited to the above-mentioned components, and can also be other types of components, as long as they can be used to fix the guide rod 2 and the telescopic pressure assembly 5.

[0036] like Figure 4 As shown, the guide rod 2 is a hollow steel or alloy tube with a smooth surface, or it can be a rod made of other materials. The two ends of the guide rod 2 are mounted on the mounting part 1 by means of installation and bolts. An air bearing 3 is slidably mounted on the guide rod 2. Specifically, the air bearing 3 is also called an air bearing or a gas bearing, which refers to a sliding bearing that uses gas as a lubricant. The most commonly used gas lubricant is air, but nitrogen, argon, hydrogen, helium, or carbon dioxide can also be used as needed.

[0037] The number of guide rods 2 can be one or more; when there are multiple guide rods 2, the multiple guide rods 2 are arranged in parallel. Specifically, the number of air bearings 3 is 2 to 4, preferably 2.

[0038] like Figure 2 As shown, the sliding frame 4 is connected to the air bearing 3 by bolts. The first end of the sliding frame 4 along the axial direction of the guide rod 2 is provided with a detection head 401. Specifically, the detection head 401 is used to contact and apply pressure to the battery cell under test. The sliding frame 4 is a metal frame, such as a frame welded from triangular iron or an iron frame cast in one piece. Its shape is not limited and can be designed according to requirements.

[0039] like Figure 2 As shown, the telescopic pressure application component 5 is a device with telescopic function and the ability to control the applied pressure, such as a telescopic cylinder. The drive end 501 of the telescopic pressure application component 5 is connected to the sliding frame 4 by bolts or by a combination of a locking block and a locking slot, so as to drive the sliding frame 4 to slide back and forth along the axial direction of the guide rod 2.

[0040] In actual use, the sliding frame 4 is driven to move towards the cell to be tested by the drive end 501 of the telescopic pressure component 5, and pressure is applied to the cell to be tested. After the applied pressure reaches the set value, the cell thickness is measured.

[0041] In this embodiment, the drive end 501 of the telescopic pressure component 5 is connected to the sliding frame 4. The sliding frame 4 is slidably connected to the guide rod 2 via the air bearing 3. The telescopic pressure component 5 directly drives the sliding frame 4 to apply a set pressure to the battery cell under test, thereby performing a thickness test on the battery cell. Since the telescopic pressure component 5 directly generates pressure, it improves the stability of the pressure applied to the battery cell by the equipment, thereby improving the accuracy of the thickness measurement. It avoids the use of components that can sway, such as linear weights, thus avoiding shaking of the measuring equipment or unstable pressure, which could lead to large measurement errors.

[0042] Meanwhile, since the sliding frame 4 and the guide rod 2 are connected by the air bearing 3, the air bearing 3 can reduce the friction between the sliding frame 4 and the guide rod 2, thereby further improving the accuracy of the pressure applied to the battery cell under test and further improving the accuracy of the battery cell thickness measurement.

[0043] In one embodiment, such as Figure 4 As shown, there are two guide rods 2, which are arranged in parallel. Each guide rod 2 is equipped with multiple air bearings 3, which are spaced apart and connected to the sliding frame 4 by bolts.

[0044] In this embodiment, such as Figure 4 As shown, the sliding frame 4 and each guide rod 2 are slidably connected by multiple spaced air bearings 3, which can limit the sliding frame 4 in multiple directions, making the sliding frame 4 more stable along the sliding direction, reducing the amount of shaking of the sliding frame 4, and thus improving the accuracy of the pressure applied by the sliding frame 4 to the battery cell under test.

[0045] In one embodiment, such as Figure 2 As shown, the telescopic pressure application component 5 is a linear motor. The drive end 501 of the linear motor is connected to the side of the sliding frame 4 along the first direction X via a snap-fit ​​connection or a bolt connection. For example... Figure 2 As shown, the first direction X is perpendicular to the axis of guide rod 2; specifically, one solution is as follows: Figure 2 and Figure 5 As shown, a groove is provided on the sliding frame 4 near the drive end 501, and a through hole is provided on the side wall of the groove. The bolt is screwed to the drive end 501 through the through hole.

[0046] Another option (not shown in the figure) is: the driving end 501 of the linear motor is provided with a locking block, the sliding frame 4 is provided with a locking groove, and the locking block is installed in the locking groove in a direction perpendicular to the first direction X and the axial direction of the guide rod 2.

[0047] Specifically, the linear motor is a stepper linear motor.

[0048] In practical use, as the linear motor drives the sliding frame 4 to move towards the battery cell under test, the control signal of the linear motor, such as the current magnitude, can be controlled to control the moving speed. For example, a large current can be used first to make the sliding frame 4 move quickly closer to the battery cell under test, and then a small current can be used to make the detection head 401 on the sliding frame 4 slowly contact the battery cell under test, thereby optimizing the contact effect.

[0049] During the contact between the detection head 401 and the battery cell under test on the sliding frame 4, the trend of current change can be controlled to control the pressure change pattern of the detection head 401 on the battery cell under test, thereby facilitating the adjustment of the pressure process, optimizing the pressure deformation of the battery cell under test, and further improving the accuracy of thickness detection.

[0050] In this embodiment, a linear motor drives the sliding frame 4 to reciprocate, thereby controlling the moving speed of the linear motor and the pressure applied to the sliding frame 4. This allows for accurate control of the pressure applied to the battery cell under test by the sliding frame 4, thereby improving the accuracy of the pressure applied to the battery cell under test and thus improving the accuracy of the battery cell thickness measurement.

[0051] In one embodiment, such as Figure 2 As shown, the cell thickness gauge also includes a reset component 6. One end of the reset component 6 is connected to the sliding frame 4 via a hook, and the other end of the reset component 6 is connected to the mounting part 1 via a hook. The reset component 6 extends along the axial direction of the guide rod 2. Specifically, the reset component 6 is a part with a certain elastic extension, such as a spring or an elastic rubber band, preferably a spring.

[0052] Specifically, such as Figure 2 As shown, a clearance groove is provided in the middle of the sliding frame 4, and a column is provided at one end of the clearance groove. The hook at the first end of the reset component 6 is connected to the column, and the second end of the reset component 6 passes through the clearance groove and is connected to the column fixed on the bracket of the mounting part 1.

[0053] In this embodiment, by providing a reset component 6, the sliding frame 4 can be reset to its initial position in the event of a sudden power outage, preventing collisions and damage to the testing equipment.

[0054] In one embodiment, such as Figure 4 As shown, the cell thickness gauge also includes a gas distribution plate 7, which is mounted on the mounting part 1. The gas distribution plate 7 is provided with an air inlet 701 and multiple air outlets 702. The air inlet 701 is used to connect the input pipe to the gas supply equipment, and the multiple air outlets 702 are respectively connected to the output pipe and connected to multiple air bearings 3.

[0055] Specifically, the gas distribution plate 7 is provided with a distribution cavity. The air inlet 701 and multiple air outlets 702 are all connected to the distribution cavity. The air inlet 701 is connected to the multiple air outlets 702 through the distribution cavity, so that the gas can be evenly distributed to ensure the consistency of the working state of each air bearing 3.

[0056] In one embodiment, such as Figure 2 As shown, the air distribution plate 7 is provided with a limiting part 703. The limiting part 703 can limit the second end of the sliding frame 4 along the axial direction of the guide rod 2. Specifically, the air distribution plate 7 is set at the initial position of the second end of the sliding frame 4. The limiting part 703 is a plate body. By contacting the sliding frame 4, it limits the sliding frame 4. Preferably, the limiting part 703 is provided with an elastic pad to prevent the sliding frame 4 from directly impacting the limiting part 703.

[0057] In this embodiment, by providing a limiting part 703 on the air distribution plate 7, the initial position of the sliding frame 4 is limited. Combined with the reset part 6, the sliding frame 4 can be pre-limited along its sliding direction to prevent the sliding frame 4 from floating up and down.

[0058] In one embodiment, such as Figure 3 As shown, the cell thickness gauge also includes a magnetic grating base ruler 8 and a magnetic grating head 9. The magnetic grating head 9 is fixedly mounted on the mounting part 1 by bolts, and the magnetic grating base ruler 8 is fixedly mounted on the sliding frame 4 by bolts. The magnetic grating head 9 cooperates with the magnetic grating base ruler 8 to measure the displacement of the sliding frame 4.

[0059] In specific usage, before measurement begins, the measurement value of the magnetic grating head 9 is the first value (i.e., the detection head 401 is in the initial position). After the detection head 401 completes the pressure application to the battery cell under test, the magnetic grating base 8 descends with the sliding frame 4, and the measurement value of the magnetic grating head 9 is the second value (i.e., the position of the detection head 401 after the set pressure value is applied to the battery cell under test). The measurement displacement of the detection head 401 can be obtained by the difference between the first value and the second value. By performing a difference calculation between the measurement displacement and the total distance (the distance between the detection head 401 and the detection stage 14 when it is in the initial position, and the detection stage 14 is used to place the battery cell under test), the thickness of the battery cell under test can be obtained.

[0060] In this embodiment, such as Figure 3 As shown, the magnetic grating head 9 works in conjunction with the magnetic grating base ruler 8 to accurately measure the displacement of the detection head 401, thereby obtaining the thickness of the battery cell under test and improving detection accuracy.

[0061] In one embodiment, such as Figure 3As shown, the cell thickness gauge also includes a reset sensor 10 and a sensing head 11. Specifically, the sensing head 11 is a bent patch. The reset sensor 10 is fixedly mounted on the mounting part 1 by bolts, and the sensing head 11 is fixedly mounted on the sliding frame 4 by adhesive bonding or bolt connection. When the sliding frame 4 is in the initial position, the reset sensor 10 can detect the sensing head 11.

[0062] In this embodiment, by setting a reset sensor 10 and a sensing head 11, the reset information of the sliding frame 4 can be obtained and instructions can be given to the operator.

[0063] In one embodiment, such as Figures 1 to 3 As shown, the cell thickness gauge also includes a protective box 12. The mounting part 1 is a side inside the protective box 12. The protective box 12 is provided with an opening 1201. The sliding frame 4 includes a frame body 402 and a detection head 401. The detection head 401 is located outside the protective box 12. A part of the frame body 402 passes through the opening 1201 on the protective box 12 and is fixedly connected to the detection head 401 by bolts.

[0064] Specifically, the protective box 12 can be a metal box or a plastic box, and the side of the protective box 12 that serves as the mounting part 1 can be a plate of a certain thickness.

[0065] In this embodiment, by setting up a protective box 12, the guide rod 2, the telescopic pressure assembly 5, and a part of the sliding frame 4 can be isolated from the outside world, reducing the impact of external dust on the air bearing 3 and other components.

[0066] In one embodiment, such as Figure 1 As shown, the cell thickness gauge also includes a fixed frame 13 and a testing platform 14. The mounting part 1 is connected to the fixed frame 13, and the testing platform 14 is used to place the cell to be tested.

[0067] Specifically, the fixing frame 13 is a frame made of metal plate or other parts, which has good resistance to deformation. The testing table 14 is a marble tabletop. The testing table 14 can be installed on the fixing frame 13 or on other tabletops.

[0068] The technical solution in this application will be fully described below with reference to an embodiment.

[0069] According to embodiments of this application, in one aspect, a cell thickness gauge is provided, such as... Figures 1 to 2 and Figure 4 As shown, it includes an installation part 1, at least one guide rod 2, a sliding frame 4, a telescopic pressure assembly 5, a reset component 6, a gas distribution plate 7, a magnetic grating base ruler 8, a magnetic grating head 9, a reset sensor 10, a sensing head 11, a protective box 12, a fixing frame 13, and a testing table 14; the specific scheme is as follows.

[0070] like Figure 2 As shown, the mounting part 1 can be a mounting plate, a mounting bracket, or a housing, etc. Of course, it is not limited to the above-mentioned components, and can also be other types of components, as long as they can be used to fix the guide rod 2 and the telescopic pressure assembly 5.

[0071] like Figure 4 As shown, the guide rod 2 is a hollow steel or alloy tube with a smooth surface, or it can be a rod made of other materials. The two ends of the guide rod 2 are mounted on the mounting part 1 by means of installation and bolts. An air bearing 3 is slidably mounted on the guide rod 2. Specifically, the air bearing 3 is also called an air bearing or a gas bearing, which refers to a sliding bearing that uses gas as a lubricant. The most commonly used gas lubricant is air, but nitrogen, argon, hydrogen, helium, or carbon dioxide can also be used as needed.

[0072] The number of guide rods 2 can be one or more; when there are multiple guide rods 2, the multiple guide rods 2 are arranged in parallel. Specifically, the number of air bearings 3 is 2 to 4, preferably 2.

[0073] like Figure 2 As shown, the sliding frame 4 is connected to the air bearing 3 by bolts. The first end of the sliding frame 4 along the axial direction of the guide rod 2 is provided with a detection head 401. Specifically, the detection head 401 is used to contact and apply pressure to the battery cell under test. The sliding frame 4 is a metal frame, such as a frame welded from triangular iron or an iron frame cast in one piece. Its shape is not limited and can be designed according to requirements.

[0074] like Figure 2 As shown, the telescopic pressure application component 5 is a device with telescopic function and the ability to control the applied pressure, such as a telescopic cylinder. The drive end 501 of the telescopic pressure application component 5 is connected to the sliding frame 4 by bolts or by a combination of a locking block and a locking slot, so as to drive the sliding frame 4 to slide back and forth along the axial direction of the guide rod 2.

[0075] More specifically, such as Figure 4 As shown, there are two guide rods 2, which are arranged in parallel. Each guide rod 2 is equipped with multiple air bearings 3, which are spaced apart and connected to the sliding frame 4 by bolts.

[0076] Specifically, the number of air bearings 3 is 2 to 4, preferably 2.

[0077] like Figure 2 As shown, the telescopic pressure application component 5 is a linear motor. The drive end 501 of the linear motor is connected to the side of the sliding frame 4 along the first direction X via a snap-fit ​​connection or a bolt connection. For example... Figure 2 As shown, the first direction X is perpendicular to the axis of guide rod 2; specifically, one solution is as follows: Figure 2 and Figure 5 As shown, a groove is provided on the sliding frame 4 near the drive end 501, and a through hole is provided on the side wall of the groove. The bolt is screwed to the drive end 501 through the through hole.

[0078] Specifically, the linear motor is a stepper linear motor.

[0079] like Figure 2 As shown, one end of the reset component 6 is connected to the sliding frame 4 via a hook, and the other end of the reset component 6 is connected to the mounting part 1 via a hook. The reset component 6 extends along the axial direction of the guide rod 2. Specifically, the reset component 6 is a part with a certain elastic extension, such as a spring, an elastic rubber band, etc., preferably a spring.

[0080] Specifically, such as Figure 2 As shown, a clearance groove is provided in the middle of the sliding frame 4, and a column is provided at one end of the clearance groove. The hook at the first end of the reset component 6 is connected to the column, and the second end of the reset component 6 passes through the clearance groove and is connected to the column fixed on the bracket of the mounting part 1.

[0081] like Figure 4 As shown, the air distribution plate 7 is installed on the mounting part 1. The air distribution plate 7 is provided with an air inlet 701 and multiple air outlets 702. The air inlet 701 is used to connect the input pipe to the air supply equipment, and the multiple air outlets 702 are respectively connected to the output pipe and connected to multiple air bearings 3.

[0082] Specifically, the gas distribution plate 7 is provided with a distribution cavity. The air inlet 701 and multiple air outlets 702 are all connected to the distribution cavity. The air inlet 701 is connected to the multiple air outlets 702 through the distribution cavity, so that the gas can be evenly distributed to ensure the consistency of the working state of each air bearing 3.

[0083] like Figure 2 As shown, the air distribution plate 7 is provided with a limiting part 703. The limiting part 703 can limit the second end of the sliding frame 4 along the axial direction of the guide rod 2. Specifically, the air distribution plate 7 is set at the initial position of the second end of the sliding frame 4. The limiting part 703 is a plate body. By contacting the sliding frame 4, it limits the sliding frame 4. Preferably, the limiting part 703 is provided with an elastic pad to prevent the sliding frame 4 from directly impacting the limiting part 703.

[0084] like Figure 3 As shown, the magnetic grating head 9 is fixedly mounted on the mounting part 1 by bolts, and the magnetic grating base ruler 8 is fixedly mounted on the sliding frame 4 by bolts. The magnetic grating head 9 and the magnetic grating base ruler 8 cooperate to measure the displacement of the sliding frame 4.

[0085] like Figure 3 As shown, specifically, the sensor head 11 is a bent patch; the reset sensor 10 is fixedly mounted on the mounting part 1 by bolts, and the sensor head 11 is fixedly mounted on the sliding frame 4 by adhesive or bolt connection. When the sliding frame 4 is in the initial position, the reset sensor 10 can detect the sensor head 11.

[0086] like Figures 1 to 3 As shown, the mounting part 1 is a side of the protective box 12. The protective box 12 is provided with an opening 1201. The sliding frame 4 includes a frame body 402 and a detection head 401. The detection head 401 is located outside the protective box 12. A part of the frame body 402 passes through the opening 1201 on the protective box 12 and is fixedly connected to the detection head 401 by bolts.

[0087] Specifically, the protective box 12 can be a metal box or a plastic box, and the side of the protective box 12 that serves as the mounting part 1 can be a plate of a certain thickness.

[0088] like Figure 1 As shown, the mounting part 1 is connected to the fixing frame 13, and the testing table 14 is used to place the battery cell to be tested. Specifically, the fixing frame 13 is a frame made of metal plate or other parts, which has good resistance to deformation. The testing table 14 is a marble tabletop. The testing table 14 can be installed on the fixing frame 13 or on other tabletops.

[0089] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A cell thickness gauge, characterized in that, include: Installation section (1); At least one guide rod (2) is provided on the mounting part (1), and an air bearing (3) is slidably provided on the guide rod (2); A sliding frame (4) is connected to the air bearing (3), and a detection head (401) is provided at the first end of the sliding frame (4) along the axial direction of the guide rod (2); Telescopic pressure assembly (5), the drive end (501) of the telescopic pressure assembly (5) is connected to the sliding frame (4) to drive the sliding frame (4) to slide back and forth along the axial direction of the guide rod (2).

2. The cell thickness gauge according to claim 1, characterized in that, There are two guide rods (2), which are arranged in parallel. Each guide rod (2) is provided with multiple air bearings (3). The multiple air bearings (3) on each guide rod (2) are spaced apart and are all connected to the sliding frame (4).

3. The cell thickness gauge according to claim 1, characterized in that, The telescopic pressure assembly (5) is a linear motor, and the drive end (501) of the linear motor is connected to the side of the sliding frame (4) along the first direction (X), wherein the first direction (X) is perpendicular to the axis of the guide rod (2).

4. The cell thickness gauge according to any one of claims 1 to 3, characterized in that, It also includes a reset component (6), one end of which is connected to the sliding frame (4), and the other end of which is connected to the mounting part (1). The reset component (6) extends along the axial direction of the guide rod (2).

5. The cell thickness gauge according to any one of claims 1 to 3, characterized in that, It also includes an air distribution plate (7), which is disposed on the mounting part (1). The air distribution plate (7) is provided with an air inlet (701) and a plurality of air outlets (702). The air inlet (701) is used to communicate with the air supply equipment, and the plurality of air outlets (702) are respectively connected to the plurality of air bearings (3).

6. The cell thickness gauge according to claim 5, characterized in that, The air distribution plate (7) is provided with a limiting part (703), which can limit the second end of the sliding frame (4) along the axial direction of the guide rod (2).

7. The cell thickness gauge according to any one of claims 1 to 3, characterized in that, It also includes a magnetic grating base scale (8) and a magnetic grating head (9). The magnetic grating head (9) is disposed on the mounting part (1), and the magnetic grating base scale (8) is disposed on the sliding frame (4). The magnetic grating head (9) cooperates with the magnetic grating base scale (8) to measure the displacement of the sliding frame (4).

8. The cell thickness gauge according to any one of claims 1 to 3, characterized in that, It also includes a reset sensor (10) and a sensing head (11). The reset sensor (10) is disposed on the mounting part (1), and the sensing head (11) is disposed on the sliding frame (4). When the sliding frame (4) is in the initial position state, the reset sensor (10) can detect the sensing head (11).

9. The cell thickness gauge according to any one of claims 1 to 3, characterized in that, It also includes a protective box (12), the mounting part (1) is a side inside the protective box (12), the protective box (12) is provided with an opening (1201), the sliding frame (4) includes a frame body (402) and the detection head (401), the detection head (401) is located outside the protective box (12), and a part of the frame body (402) passes through the opening (1201) and is connected to the detection head (401).

10. The cell thickness gauge according to any one of claims 1 to 3, characterized in that, It also includes a mounting bracket (13) and a testing platform (14), wherein the mounting part (1) is connected to the mounting bracket (13) and the testing platform (14) is used to place the battery cell to be tested.

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