Battery cell thickness measuring device and battery production line

Abstract

The invention discloses a battery cell thickness measuring device and a battery production line. The battery cell thickness measuring device comprises a support; the clamping assembly comprises a first clamping piece and a second clamping piece which are movably arranged on the bracket; the first driving structure comprises a first driving piece arranged on the support, and the first driving piece is provided with an output end which stretches out and draws back in the first direction parallel to the horizontal direction and is used for driving the first clamping piece to move; the second driving structure comprises an abutting part and a second driving part arranged on the support, the second driving part is provided with an output end which stretches out and draws back in the vertical direction and is used for driving the abutting part to ascend and descend, the abutting part is provided with a wide part and a narrow part which are connected through a guide face, and the wide part is located above the narrow part and is used for driving the second clamping part to move; the elastic piece acts on the second clamping piece; and the sensor assembly is used for detecting the thickness of the battery cell. According to the structure, the occupied space in the horizontal direction can be reduced, and meanwhile, the fluctuation of the pressure borne by the battery cell when the battery cell is clamped can be prevented.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell thickness measuring device and a battery production line. Background Art

[0002] After the square shell battery is removed from the package and put on the production line, before the battery cell is cleaned, glued and other processing steps are carried out, the thickness of the battery cell needs to be measured to determine whether the thickness of the battery cell is qualified.

[0003] In the prior art, when measuring the thickness of a battery cell, it is usually necessary to move the battery cell out of the conveying mechanism of the production line and measure the thickness of the battery cell outside the production line. However, this measurement method requires the battery cell to be repeatedly moved out and into the production line, which affects the efficiency of production and processing.

[0004] To this end, the related art proposes a measurement method for measuring the thickness of the battery cell on the conveying mechanism of the production line. Specifically, the battery cell being conveyed is clamped and the thickness of the battery cell is measured by a sensor. Among them, since the battery cell needs to continue to be conveyed after the measurement is completed, it is necessary to set two clamps in the horizontal direction on the frame, and drive the two clamps to clamp the battery cell one by one through two cylinders whose piston rods are extended in the horizontal direction, so that the two clamps can be separated from the battery cell after the battery cell is measured, so as to avoid the two clamps affecting the conveying of the battery cell. However, since the piston rods of the two cylinders are extended and retracted in the horizontal direction, this measurement method requires a large space in the horizontal direction. In addition, according to relevant regulations in the industry, when measuring the thickness of a battery cell, it is necessary to ensure that the pressure to which the battery cell is clamped reaches a preset value. The two clamps are directly driven by a piston rod that extends and retracts horizontally through the cylinder, causing one of the clamps to move back during the clamping of the battery cell due to the failure to balance the driving forces of the two cylinders. As a result, the pressure to which the battery cell is clamped fluctuates and is lower than the preset value, thereby affecting the reliability of the measurement results. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery cell thickness measuring device, which is conducive to reducing the space required in the horizontal direction and, at the same time, is conducive to preventing the pressure on the battery cell when it is clamped from fluctuating when measuring the thickness of the battery cell.

[0006] The present application also proposes a battery production line having the above-mentioned battery cell thickness measuring device.

[0007] According to the first aspect of the present application, the battery cell thickness measuring device comprises: a bracket; a clamping assembly, comprising a first clamping member and a second clamping member movably arranged on the bracket, the second clamping member having an extreme position for clamping the battery cell; a first driving structure, comprising a first driving member arranged on the bracket, the first driving member having an output end that is telescopic along a first direction parallel to a horizontal direction and is used to drive the first clamping member to move; a second driving structure, comprising an abutment portion and a second driving member arranged on the bracket, the second driving member having an output end that is telescopic along a vertical direction and is used to drive the abutment portion to rise and fall, the abutment portion having a wide portion and a narrow portion connected by a guide surface, the wide portion being located above the narrow portion and being used to drive the second clamping member to move to the extreme position; an elastic member, used to drive the second clamping member to disengage from the extreme position; a sensor assembly, used to detect the thickness of the battery cell.

[0008] The battery cell thickness measuring device according to the embodiment of the present application has at least the following beneficial effects: when it is necessary to measure the battery cells on the conveying mechanism of the battery production line, the abutting portion is driven to descend by the second driving member, so that the abutting portion changes from abutting against the second clamping member at the narrow portion to abutting against the second clamping member at the wide portion, thereby driving the second clamping member to move toward the first clamping member along the first direction to the extreme position for clamping the battery cell; in addition, the first driving member drives the first clamping member to move toward the second clamping member along the first direction, and finally the first clamping member and the second clamping member clamp the battery cell. The battery cell is clamped and sufficient pressure is applied to the battery cell so that the pressure on the battery cell when it is clamped reaches a preset value. The thickness of the battery cell is then measured by the sensor assembly. After the measurement is completed, the first clamping member is driven to separate from the battery cell by the first driving structure, and the abutting portion is driven to rise by the second driving structure. At this time, under the action of the elastic member, the abutting portion changes from a wide portion abutting against the second clamping member to a narrow portion abutting against the second clamping member, so that the second clamping member is separated from the battery cell under the action of the elastic member, and the conveying mechanism of the battery production line can continue to convey the battery cell. Among them, since the output end of the second driving member is telescopic in the vertical direction, compared with the situation in which the piston rods of the two cylinders in the related art are telescopic in the horizontal direction, it is beneficial to reduce the space required in the horizontal direction. In addition, when the second clamping member moves to the extreme position for clamping the battery cell, although the second clamping member will be subjected to the force transmitted by the first clamping member and transmitted to the abutment portion, since the direction of the force transmitted to the abutment portion by the second clamping member is parallel to the first direction, the force transmitted to the abutment portion by the second clamping member cannot drive the abutment portion to rise, so that the second clamping member can be relatively stably maintained in the extreme position for clamping the battery cell, which is beneficial to prevent the pressure on the battery cell when it is clamped from fluctuating, thereby improving the reliability of the measurement results.

[0009] According to some embodiments of the present application, the battery cell thickness measuring device has two groups of the clamping assemblies, the two groups of the clamping assemblies are arranged at intervals along the first direction, the abutment portion is arranged between the two second clamping members, the wide portion can simultaneously drive the two second clamping members to move away from each other along the first direction and to their respective extreme positions, the bracket is provided with two first driving structures corresponding to the two first clamping members one by one, and the two groups of the clamping assemblies are both provided with the sensor assembly.

[0010] According to some embodiments of the present application, the elastic member is a spring, one end of the elastic member is connected to one of the second clamping members, and the other end of the elastic member is connected to another second clamping member.

[0011] According to some embodiments of the present application, the battery cell thickness measuring device further includes a limiting structure, the abutment portion has a working position for driving the second clamping member to move to the extreme position, and the limiting structure is used to limit the abutment portion located at the working position from deviating along the first direction.

[0012] According to some embodiments of the present application, the limiting structure includes a support, a plug-in portion is provided at the bottom of the abutting portion, and a plug-in hole for plugging the plug-in portion is provided on the support.

[0013] According to some embodiments of the present application, a buffer structure is provided on the support corresponding to the abutting portion.

[0014] According to some embodiments of the present application, the buffer structure includes an elastic buffer block, which is arranged on the support and is offset from the plug-in hole.

[0015] According to some embodiments of the present application, the buffer block is detachably connected to the support.

[0016] According to the second aspect of the present application, a battery production line includes:

[0017] A frame, on which the battery cell thickness measuring device according to any one of claims 1 to 8 is arranged;

[0018] A conveying mechanism is arranged on the frame and is used to convey the battery cells.

[0019] According to some embodiments of the present application, at least two battery cell thickness measuring devices are arranged on the rack along the conveying direction of the battery cells.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a structural schematic diagram of a battery cell thickness measuring device according to an embodiment of the present application;

[0023] Figure 2 is a structural schematic diagram of a support according to an embodiment of the present application;

[0024] Figure 3 This is a schematic diagram of a state of a battery cell thickness measuring device according to an embodiment of the present application when the battery cell is not clamped;

[0025] Figure 4 yes Figure 3 A partial enlarged schematic diagram in the middle;

[0026] Figure 5 This is a schematic diagram of a state of a battery cell thickness measuring device of an embodiment of the present application when clamping a battery cell;

[0027] Figure 6 It is a partial structural schematic diagram of a battery production line according to an embodiment of the present application.

[0028] Reference numerals:

[0029] Battery cell a;

[0030] Bracket 100;

[0031] A first clamping member 210, a second clamping member 220, and a connecting portion 221;

[0032] A first driving member 310;

[0033] Abutment portion 410, guide surface 411, wide portion 412, narrow portion 413, plug-in portion 414, second driving member 420;

[0034] Elastic member 500;

[0035] Support 600, plug hole 610, buffer block 620;

[0036] Sensor 710, first matching portion 720, second matching portion 730;

[0037] Frame 800 and conveying mechanism 900 . DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that if orientation descriptions are involved, the orientations or positional relationships indicated, such as up, down, front, back, left, and right, are based on the orientations or positional relationships shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0040] In the description of this application, if the words "some", "greater than", "less than", "exceed", "above", "below", "within" etc. appear, "some" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number, and "above", "below", "within", etc. are understood to include the number.

[0041] In the description of this application, if the words "first", "second", etc. appear, they are only used to distinguish technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0043] Reference Figures 1 to 6 According to an embodiment of the present application, a battery cell thickness measuring device includes a bracket 100, a clamping assembly, a first driving structure, a second driving structure, an elastic member 500 and a sensor assembly.

[0044] Specifically, the bracket 100 is used to be fixed on the frame 800 of the battery production line, the clamping assembly includes a first clamping member 210 and a second clamping member 220 movably arranged on the bracket 100 and used to clamp the battery cell a, the first clamping member 210 and the second clamping member 220 are used to cooperate with each other to clamp the battery cell a on the conveying mechanism 900 of the battery production line, the second clamping member 220 has an extreme position for clamping the battery cell a, the first driving structure includes a first driving member 310 arranged on the bracket 100 in a horizontal direction, the first driving member 310 has an output end that is telescopic in a first direction parallel to the horizontal direction and is used to drive the first clamping member 210 to move relative to the bracket 100 in the first direction, and the second driving structure includes an abutment portion 410 and a vertical direction. A second driving member 420 is arranged on the bracket 100, and the second driving member 420 has an output end that can be extended and retracted in the vertical direction and is used to drive the abutting portion 410 to rise and fall. The abutting portion 410 abuts against the second clamping member 220 and has a wide portion 412 and a narrow portion 413 connected by a guide surface 411, that is, the wide portion 412 and the narrow portion have a guide surface 411 for transition and guidance. The wide portion 412 is located above the narrow portion 413 and is used to drive the second clamping member 220 to move relative to the bracket 100 along the first direction to the extreme position for clamping the battery cell a. The elastic member 500 acts on the second clamping member 220 and is used to drive the second clamping member 220 to disengage from the extreme position for clamping the battery cell a. The sensor component is arranged on the clamping component and is used to detect the thickness of the battery cell a.

[0045] It should be noted that the first direction mentioned above is the X direction in the drawings.

[0046] When it is necessary to measure the battery cell a on the conveying mechanism of the battery production line, the second driving member 420 drives the abutting portion 410 to descend, so that the abutting portion 410 changes from the narrow portion 413 abutting against the second clamping member 220 to the wide portion 412 abutting against the second clamping member 220, thereby driving the second clamping member 220 to move along the first direction toward the first clamping member 210 to the extreme position for clamping the battery cell a. In addition, the first driving member 310 drives the first clamping member 210 to move along the first direction toward the second clamping member 220, and finally the first clamping member 210 and the second clamping member 220 clamp the battery cell a and apply force to the battery cell a. Sufficient pressure is applied to make the pressure on battery cell a when it is clamped reach a preset value, and then the thickness of battery cell a is measured by the sensor assembly. After the measurement is completed, the first driving structure drives the first clamping member 210 to separate from the battery cell a, and the second driving structure drives the abutting portion 410 to rise. At this time, under the action of the elastic member 500, the abutting portion 410 changes from being abutted against the second clamping member 220 by the wide portion 412 to being abutted against the second clamping member 220 by the narrow portion 413, so that the second clamping member 220 is separated from the battery cell a under the action of the elastic member 500, thereby enabling the conveying mechanism of the battery production line to continue to convey the battery cell a.

[0047] Among them, since the output end of the second driving member 420 is extended and retracted in the vertical direction, compared with the situation in the related art where the piston rods of the two cylinders are extended and retracted in the horizontal direction, it is beneficial to reduce the space required to be occupied in the horizontal direction.

[0048] In addition, when the second clamping member 220 moves to the extreme position for clamping the battery cell a, although the second clamping member 220 will be subjected to the force transmitted by the first clamping member 210 and transmitted to the abutment portion 410, since the direction of the force transmitted by the second clamping member 220 to the abutment portion 410 is parallel to the first direction, the force transmitted by the second clamping member 220 to the abutment portion 410 cannot drive the abutment portion 410 to rise, so that the second clamping member 220 can be relatively stably maintained in the extreme position for clamping the battery cell a (that is, it will not easily retreat), which is beneficial to prevent the pressure on the battery cell a when it is clamped from fluctuating, thereby improving the reliability of the measurement results.

[0049] Reference Figure 1 , Figure 3 and Figure 5 In some embodiments, the battery cell thickness measuring device of the present application has two groups of clamping components, the two groups of clamping components are arranged at intervals along the first direction, the abutment portion 410 is arranged between the two second clamping members 220, the wide portion 412 can simultaneously drive the two second clamping members 220 to move away from each other along the first direction and to their respective extreme positions for clamping the battery cell a, and the bracket 100 is provided with two first driving structures corresponding to the two first clamping members 210, and the two groups of clamping components are provided with sensor components. Specifically, when it is necessary to clamp the battery cell a, the abutment portion 410 is driven down by the second driving member 420, so that the wide portion 412 simultaneously drives the two second clamping members 220 to move away from each other along the first direction and to their respective extreme positions for clamping the battery cell a. At this time, the first clamping member 210 driven by the first driving member 310 can clamp the two battery cells a at the same time and measure the thickness through the sensor assembly. After the measurement is completed, the abutment portion 410 is driven to rise by the second driving member 420. Since the second clamping member 220 is acted upon by the elastic member 500, the abutment portion 410 changes from being abutted against the two second clamping members 220 by the wide portion 412 to being abutted against the two second clamping members 220 by the narrow portion 413, thereby separating the second clamping member 220 from the battery cell a under the action of the elastic member 500. At this time, the first driving member 310 is cooperated to drive the first clamping member 210 to separate from the battery cell a, so that the battery cell a can continue to be transported.

[0050] Reference Figures 3 to 5 In some embodiments, the elastic member 500 is a spring, one end of the elastic member 500 is connected to one of the second clamping members 220 , and the other end of the elastic member 500 is connected to another second clamping member 220 .

[0051] Specifically, the elastic member 500 is a tension spring, and accordingly, the second clamping member 220 is provided with a connecting portion 221 for connecting the tension spring, and the connecting portion 221 is provided with a hanging hole for hanging a hook of the tension spring, so as to facilitate the assembly of the elastic member 500 and facilitate replacement of the elastic member 500 when it fails.

[0052] It should be noted that, in some other embodiments, the elastic member 500 may also be a rubber band or other elastic structures, which is not limited here.

[0053] It should be noted that in some other embodiments, the elastic member 500 may also be connected between the second clamping member 220 and the bracket 100 , which is not limited here. Specifically, an elastic member 500 is connected between each second clamping member 220 and the bracket 100 .

[0054] It should be noted that when only one set of clamping components is provided, the elastic member 500 is connected between the second clamping member 220 and the bracket 100. At this time, the elastic member 500 can be a spring, or a rubber band or other elastic structure, which is not limited here.

[0055] In some of the embodiments, the battery cell thickness measuring device of the present application also includes a limiting structure, and the abutment portion 410 has a working position for driving the second clamping member 220 to move to an extreme position for clamping the battery cell a. The limiting structure is used to limit the abutment portion 410 located at the working position from being offset along the first direction, which helps to further prevent the pressure on the battery cell a from fluctuating when it is clamped.

[0056] Reference Figures 1 to 5 In some embodiments, the limiting structure includes a support 600, a plug-in portion 414 is provided at the bottom of the abutment portion 410, and a plug-in hole 610 for plugging the plug-in portion 414 is provided on the support 600, and the structure is simple and easy to implement. Specifically, the support 600 can be provided on the bracket 100 of the battery cell thickness measuring device, or on the rack 800 of the battery production line, which is not limited here.

[0057] In some of the embodiments, a buffer structure is provided on the support 600 corresponding to the abutment portion 410, which is beneficial to reducing the impact force generated by the abutment portion 410 hitting the support 600 when it descends, and is beneficial to improving the stability of the relevant structure during operation.

[0058] Reference Figure 2 and Figure 4 In some of the embodiments, the buffer structure includes an elastic buffer block 620, which is disposed on the support 600 and offset from the plug hole 610. When the abutting portion 410 descends, it can abut against the buffer block 620, thereby achieving a buffering effect.

[0059] Specifically, the buffer block 620 is made of elastomeric rubber. Of course, the buffer block 620 can also be made of rubber or silicone rubber, which is not limited here.

[0060] In some of the embodiments, the buffer block 620 is detachably connected to the support 600 to facilitate replacement of a failed buffer block 620 .

[0061] Specifically, the buffer block 620 is detachably disposed on the support 600 by means of screws or an adhesive layer.

[0062] It should be noted that, in some other embodiments, the buffer structure may also be a spring disposed on the support 600, which is not limited here.

[0063] It should be noted that, in some other embodiments, the plug hole 610 may also be disposed at the bottom of the abutment portion 410 , which is not limited herein. In this case, the plug portion 414 is disposed on the support 600 .

[0064] In some of the embodiments, a guide column and a guide sleeve extending along the first direction are provided on the bracket 100 corresponding to the first clamping member 210 , so as to improve the stability of the first clamping member 210 during operation.

[0065] In some of the embodiments, a guide rail extending along the first direction is provided on the bracket 100 corresponding to the second clamping member 220, and a slider slidably connected to the guide rail is provided on the second clamping member 220, thereby facilitating improving the stability of the second clamping member 220 during operation.

[0066] It should be noted that, in some other embodiments, the first clamping member 210 may also be guided by mutually cooperating guide rails and sliders, and the second clamping member 220 may also be guided by mutually cooperating guide pillars and guide sleeves, which is not limited here.

[0067] Reference Figure 1 , Figure 3 and Figure 5 In some embodiments, the sensor assembly includes a sensor 710, a first matching portion 720 and a second matching portion 730, wherein the first matching portion 720 is arranged on the side (non-clamping surface) of the first clamping member 210, and the second matching portion 730 is arranged on the side (non-clamping surface) of the second clamping member 220 corresponding to the first matching portion 720, and the sensor 710 is arranged on the first matching portion 720, and its structure is simple and easy to implement.

[0068] Specifically, the sensor 710 is a contact displacement sensor or a non-contact displacement sensor.

[0069] When the sensor 710 is a contact displacement sensor, the sensor 710 has a retractable contact. When the contact of the sensor 710 just contacts the second matching portion 730, the distance between the clamping surface of the first clamping member 210 and the clamping surface of the second clamping member 220 is a preset value L1, and L1 is greater than the thickness of the battery cell a. After the first clamping member 210 and the second clamping member 220 clamp the battery cell a, the distance that the contact of the sensor 710 retracts is L2, and the thickness of the battery cell a is T, then T=L1-L2.

[0070] The contact displacement sensor may be a resistive, capacitive, piezoelectric, or other type. Of course, other types may also be used, which are not limited here.

[0071] The non-contact displacement sensor may specifically be a laser displacement sensor or an ultrasonic displacement sensor. Of course, other types may also be used, which are not limited here.

[0072] When the sensor 710 is a laser displacement sensor, after the first clamping member 210 and the second clamping member 220 clamp the battery cell a, the reflection time of the laser beam and the speed of light are used to calculate the distance S1 between the first matching portion 720 and the second matching portion 730, wherein the distance S2 from the first matching portion 720 to the clamping surface of the first clamping member 210 and the distance S3 from the second matching portion 730 to the clamping surface of the second clamping member 220 are preset values, and the thickness of the battery cell a is T, then T=S1-S2-S3.

[0073] When the sensor 710 is an ultrasonic displacement sensor, the measurement method is similar to that of a laser displacement sensor. The difference is that after the first clamping member 210 and the second clamping member 220 clamp the battery cell a, the distance between the first mating portion 720 and the second mating portion 730 is calculated using the reflection time of the ultrasonic wave and the propagation speed of the ultrasonic wave in the air.

[0074] It should be noted that how to use the sensor 710 to measure the thickness of the battery cell a is not an improvement of the present application. The above measurement method is only an example. Other measurement methods can also be used in actual measurement, which will not be repeated here.

[0075] It should be noted that, in some other embodiments, the sensor 710 may also be disposed on the second matching portion 730 , which is not limited here.

[0076] In some of the embodiments, the first driving member 310 and the second driving member 420 are cylinders.

[0077] It should be noted that, in some other embodiments, the first driving member 310 and the second driving member 420 may be hydraulic cylinders or electric push rods, or other types of linear driving devices, which are not limited here.

[0078] Reference Figure 6 According to the battery production line of the embodiment of the present application, it includes a rack 800 and a conveying mechanism 900, the rack 800 is provided with the above-mentioned battery cell thickness measuring device, and the conveying mechanism 900 is arranged on the rack 800 and is used to convey the battery cell a.

[0079] It can be understood that, since the battery production line of the embodiment of the present application includes the above-mentioned battery cell thickness measuring device, the battery production line of the embodiment of the present application has all the technical effects of the above-mentioned battery cell thickness measuring device.

[0080] Reference Figure 6 In some of the embodiments, at least two battery cell thickness measuring devices are provided on the rack 800 along the conveying direction of the battery cell a, which is beneficial to further improve the measurement efficiency.

[0081] In the description of this specification, if the description involves reference terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" and "some examples", it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell thickness measuring device, characterized in that: include: Bracket; A clamping assembly, comprising a first clamping member and a second clamping member movably arranged on the bracket, wherein the second clamping member has an extreme position for clamping the battery core; A first driving structure comprises a first driving member arranged on the bracket, wherein the first driving member has an output end which is telescopic along a first direction parallel to a horizontal direction and is used for driving the first clamping member to move; The second driving structure comprises an abutting portion and a second driving member arranged on the bracket, the second driving member has an output end that is telescopic in the vertical direction and is used to drive the abutting portion to move up and down, the abutting portion has a wide portion and a narrow portion connected by a guide surface, the wide portion is located above the narrow portion and is used to drive the second clamping member to move to the extreme position; an elastic member, used for driving the second clamping member to leave the extreme position; Sensor assembly, used to detect the thickness of the battery cell.

2. The battery cell thickness measuring device according to claim 1, characterized in that: The battery cell thickness measuring device has two groups of clamping assemblies, which are arranged at intervals along the first direction, and the abutment portion is arranged between the two second clamping members. The wide portion can simultaneously drive the two second clamping members to move away from each other along the first direction and to their respective extreme positions. The bracket is provided with two first driving structures corresponding to the two first clamping members one by one, and the two groups of clamping assemblies are both provided with the sensor assembly.

3. The battery thickness measuring device according to claim 2, characterized in that: The elastic member is a spring, one end of the elastic member is connected to one of the second clamping members, and the other end of the elastic member is connected to another second clamping member.

4. The battery cell thickness measuring device according to any one of claims 1 to 3, characterized in that: The battery cell thickness measuring device further includes a limiting structure, the abutting portion has a working position for driving the second clamping member to move to the extreme position, and the limiting structure is used to limit the abutting portion located at the working position from deviating along the first direction.

5. The battery thickness measuring device according to claim 4, characterized in that: The limiting structure comprises a support, a plug-in portion is arranged at the bottom of the abutting portion, and a plug-in hole for plugging the plug-in portion is arranged on the support.

6. The battery cell thickness measuring device according to claim 5, characterized in that: A buffer structure is arranged on the support corresponding to the abutting portion.

7. The battery cell thickness measuring device according to claim 6, characterized in that: The buffer structure comprises an elastic buffer block, which is arranged on the support and staggered with the plug hole.

8. The battery cell thickness measuring device according to claim 7, characterized in that: The buffer block is detachably connected to the support.

9. A battery production line, characterized in that: include: A frame, on which the battery cell thickness measuring device according to any one of claims 1 to 8 is arranged; A conveying mechanism is arranged on the frame and is used to convey the battery cells.

10. The battery production line according to claim 9, characterized in that: At least two battery cell thickness measuring devices are arranged on the frame along the conveying direction of the battery cells.

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