Battery cell thickness measuring mechanism and battery production line

Abstract

The invention discloses a battery cell thickness measuring mechanism and a battery production line. The battery cell thickness measuring mechanism 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 a transmission part, a connecting rod and a second driving piece arranged on the support, the two ends of the connecting rod are hinged to the transmission part and the second clamping piece correspondingly, the second driving piece is provided with an output end which stretches out and draws back in the vertical direction and is used for driving the transmission part to ascend and descend, and the transmission part is used for being matched with the connecting rod to drive the second clamping piece to move in the first direction; and the sensor assembly is arranged on the clamping assembly and 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 mechanism 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 mechanism, which is conducive to reducing the space required in the horizontal direction and, at the same time, is conducive to preventing the pressure fluctuations when the battery cell is clamped 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 mechanism.

[0007] According to the first aspect of the present application, the battery cell thickness measuring mechanism comprises: a bracket; a clamping assembly, comprising a first clamping member and a second clamping member movably arranged on the bracket and used to clamp the battery cell, 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 along the first direction; a second driving structure, comprising a transmission part, a connecting rod and a second driving member arranged on the bracket, the two ends of the connecting rod are respectively hinged to the transmission part and the second clamping member, the second driving member having an output end that is telescopic along a vertical direction and is used to drive the transmission part to rise and fall, and the transmission part is used to cooperate with the connecting rod to drive the second clamping member to move along the first direction; a sensor assembly, arranged on the clamping assembly and used to detect the thickness of the battery cell.

[0008] According to the battery cell thickness measuring mechanism of the embodiment of the present application, at least the following beneficial effects are achieved: when it is necessary to measure the battery cell on the conveying mechanism of the battery production line, the transmission part is driven to descend by the second driving member, so that the transmission part cooperates with the connecting rod to drive the second clamping member to move toward the first clamping member along the first direction, and when the length direction of the connecting rod is parallel to the first direction, the current position of the transmission part is maintained, and the second clamping member is moved to the limit 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 and apply sufficient pressure to the battery cell, so that the pressure on the battery cell when clamped reaches a preset value, and then the thickness of the battery cell is 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 second clamping member is driven to separate from the battery cell by the second driving structure, so that 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 case 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, the length direction of the connecting rod is parallel to the first direction. At this time, although the second clamping member will be affected by the force transmitted by the first clamping member and act on the transmission part through the connecting rod, since the length direction of the connecting rod is parallel to the first direction, the force transmitted by the connecting rod will not generate a component force in the vertical direction, that is, the force transmitted by the connecting rod cannot drive the transmission part to rise or fall, 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, so as to improve the reliability of the measurement results.

[0009] According to some embodiments of the present application, the battery cell thickness measuring mechanism has two groups of the clamping assemblies, the two groups of the clamping assemblies are arranged at intervals along the first direction, the transmission part is arranged between the two second clamping members, the two second clamping members are hinged with the connecting rod, the transmission part is used to cooperate with the connecting rod to simultaneously drive the two second clamping members to approach or move away from each other along the first direction, 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 provided with the sensor assembly.

[0010] According to some embodiments of the present application, the battery cell thickness measuring mechanism also includes a limiting structure, the transmission part has a working position for driving the second clamping member to move to an extreme position for clamping the battery cell, and the limiting structure is used to limit the displacement of the transmission part located at the working position along the first direction.

[0011] 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 transmission portion, and a plug-in hole for plugging the plug-in portion is provided on the support.

[0012] According to some embodiments of the present application, the battery cell thickness measuring mechanism further includes a positioning structure, and the positioning structure is used to limit the stroke of the output end of the second driving member so that the working position is the limit position of the transmission part.

[0013] According to some embodiments of the present application, the positioning structure includes a positioning step provided on the transmission part and connected with the plug-in part, and the positioning step can be abutted against the support when the transmission part moves to the working position.

[0014] According to some embodiments of the present application, a buffer structure is provided on the support corresponding to the transmission part.

[0015] According to some embodiments of the present application, the buffer structure includes an elastic buffer block, which is arranged on the support and offset from the plug hole. Along the vertical direction, one end of the buffer block away from the support is higher than the insertion end of the plug hole.

[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 mechanism 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 mechanisms 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 mechanism 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 in which a battery cell thickness measuring mechanism according to an embodiment of the present application does not clamp a battery cell;

[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 in which a cell thickness measuring mechanism of an embodiment of the present application clamps a 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 and a second clamping member 220;

[0032] A first driving member 310;

[0033] Transmission part 410, plug-in part 411, positioning step 412, connecting rod 420, second driving member 430;

[0034] Support 500, plug hole 510, buffer block 520;

[0035] Sensor 610, first matching portion 620, second matching portion 630;

[0036] Frame 700 and conveying mechanism 800 . DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Reference Figures 1 to 6 According to an embodiment of the present application, the battery cell thickness measuring mechanism includes a bracket 100, a clamping assembly, a first driving structure, a second driving structure and a sensor assembly.

[0043] Specifically, the bracket 100 is used to be fixed on the frame 700 of the battery production line, and 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 800 of the battery production line, and the second clamping member 220 has an extreme position for clamping the battery cell a, and the first driving structure includes a first driving member 310 arranged on the bracket 100 in a horizontal direction, and the first driving member 310 has 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. The movable output end, the second driving structure includes a transmission part 410, a connecting rod 420 and a second driving member 430 arranged on the bracket 100 in a vertical direction, the two ends of the connecting rod 420 are respectively hinged to the transmission part 410 and the second clamping member 220, that is, one end of the connecting rod 420 is hinged to the transmission part 410, and the other end of the connecting rod 420 is hinged to the second clamping member 220, the second driving member 430 has an output end that is telescopic in the vertical direction and is used to drive the transmission part 410 to rise and fall, the transmission part 410 is used to cooperate with the connecting rod 420 to drive the second clamping member 220 to move relative to the bracket 100 along the first direction, and the sensor assembly is arranged on the clamping assembly and is used to detect the thickness of the battery cell a.

[0044] It should be noted that the first direction mentioned above is the X direction in the drawings.

[0045] When it is necessary to measure the battery cell a on the conveying mechanism 800 of the battery production line, the transmission part 410 is driven to descend by the second driving member 430, so that the transmission part 410 cooperates with the connecting rod 420 to drive the second clamping member 220 to move along the first direction toward the first clamping member 210. When the length direction of the connecting rod 420 is parallel to the first direction, the current position of the transmission part 410 is maintained. At this time, the second clamping member 220 moves to the extreme position for clamping the battery cell a. In addition, the first driving member 310 drives the first clamping member 210 along the first direction. The first direction moves 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 sufficient pressure to the battery cell a, so that the pressure applied to the battery cell a when clamped reaches a preset value, and then the thickness of the battery cell a is measured by the sensor assembly. After the measurement is completed, the first clamping member 210 is driven to separate from the battery cell a by the first driving structure, and the second clamping member 220 is driven to separate from the battery cell a by the second driving structure, so that the conveying mechanism 800 of the battery production line can continue to convey the battery cell a.

[0046] Among them, since the output end of the second driving member 430 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.

[0047] In addition, when the second clamping member 220 moves to the extreme position for clamping the battery cell a, the length direction of the connecting rod 420 is parallel to the first direction. At this time, although the second clamping member 220 will be affected by the force transmitted by the first clamping member 210 and act on the transmission part 410 through the connecting rod 420, since the length direction of the connecting rod 420 is parallel to the first direction, the force transmitted by the connecting rod 420 will not generate a component force in the vertical direction, that is, the force transmitted by the connecting rod 420 cannot drive the transmission part 410 to rise or fall, 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, so as to improve the reliability of the measurement results.

[0048] Reference Figure 1 , Figure 3 and Figure 5 In some embodiments, the battery thickness measuring mechanism 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 transmission part 410 is arranged between the two second clamping members 220, the two second clamping members 220 are hinged with connecting rods 420, the transmission part 410 is used to cooperate with the connecting rod 420 to simultaneously drive the two second clamping members 220 to approach or move away from each other along the first direction, 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. When in use, the thickness of two battery cells a can be measured at the same time, which is conducive to improving the measurement efficiency. Specifically, when it is necessary to clamp the battery cell a, the transmission part 410 is driven to descend by the second driving member 430, so that the transmission part 410 cooperates with the connecting rod 420 to simultaneously drive the two second clamping members 220 to move away from each other along the first direction. 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 transmission part 410 is driven to rise by the second driving member 430, so that the transmission part 410 cooperates with the connecting rod 420 to simultaneously drive the two second clamping members 220 to approach each other along the first direction, so that the second clamping members 220 are separated from the battery cell a. At this time, the first driving member 310 is cooperated to drive the first clamping member 210 to separate from the battery cell a, and the battery cell a can continue to be transported.

[0049] In some of the embodiments, the battery cell thickness measuring mechanism of the present application also includes a limiting structure, and the transmission part 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 transmission part 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.

[0050] Reference Figures 1 to 5In some embodiments, the limiting structure includes a support 500, a plug-in portion 411 is provided at the bottom of the transmission portion 410, and a plug-in hole 510 for plugging the plug-in portion 411 is provided on the support 500, and the structure is simple and easy to implement. Specifically, the support 500 can be provided on the bracket 100 of the battery cell thickness measuring mechanism, or on the rack 700 of the battery production line, which is not limited here.

[0051] In some of the embodiments, the battery cell thickness measuring mechanism of the present application also includes a positioning structure, which is used to limit the stroke of the output end of the second driving member 430 so that the working position of the transmission part 410 is the extreme position of the transmission part 410, to ensure that the second driving member 430 can stably drive the transmission part 410 to descend to the working position, so that the second clamping member 220 can stably move to the extreme position for clamping the battery cell a when clamping the battery cell a.

[0052] Reference Figure 4 In some embodiments, the positioning structure includes a positioning step 412 disposed on the transmission part 410 and connected to the plug-in part 411. The positioning step 412 can be abutted against the support 500 when the transmission part 410 moves to the working position. The structure is simple and easy to implement.

[0053] In some of the embodiments, a buffer structure is provided on the support 500 corresponding to the transmission part 410, which is beneficial to reducing the impact force on the support 500 when the transmission part 410 descends to the working position, and is beneficial to improving the stability of the relevant structure during operation.

[0054] Reference Figure 2 and Figure 4 In some embodiments, the buffer structure includes an elastic buffer block 520, which is arranged on the support 500 and offset from the plug hole 510. In the vertical direction, the end of the buffer block 520 away from the support 500 is higher than the insertion end of the plug hole 510, so that the transmission part 410 can be abutted against the buffer block 520 before the positioning step 412 is abutted against the support 500.

[0055] Specifically, the buffer block 520 is made of elastomeric rubber. Of course, the buffer block 520 can also be made of rubber or silicone rubber, which is not limited here.

[0056] In some embodiments, the buffer block 520 is detachably mounted on the support 500, so as to facilitate replacement of a failed buffer block 520. Specifically, the buffer block 520 is detachably mounted on the support 500 by means of screws or an adhesive layer.

[0057] It should be noted that, in some other embodiments, the buffer structure may also be a spring disposed on the support 500, which is not limited here.

[0058] It should be noted that, in some other embodiments, the plug hole 510 may also be disposed at the bottom of the transmission portion 410 , which is not limited herein. In this case, the plug portion 411 and the positioning step 412 are disposed on the support 500 .

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Reference Figure 1 , Figure 3 and Figure 5 In some embodiments, the sensor assembly includes a sensor 610, a first matching portion 620 and a second matching portion 630, wherein the first matching portion 620 is arranged on the side (non-clamping surface) of the first clamping member 210, and the second matching portion 630 is arranged on the side (non-clamping surface) of the second clamping member 220 corresponding to the first matching portion 620, and the sensor 610 is arranged on the first matching portion 620, and its structure is simple and easy to implement.

[0063] Specifically, the sensor 610 is a contact displacement sensor or a non-contact displacement sensor.

[0064] When the sensor 610 is a contact displacement sensor, the sensor 610 has a retractable contact. When the contact of the sensor 610 just contacts the second matching portion 630, 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 610 retracts is L2, and the thickness of the battery cell a is T, then T=L1-L2.

[0065] 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.

[0066] 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.

[0067] When the sensor 610 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 620 and the second matching portion 630, wherein the distance S2 from the first matching portion 620 to the clamping surface of the first clamping member 210 and the distance S3 from the second matching portion 630 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.

[0068] When the sensor 610 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 620 and the second mating portion 630 is calculated using the reflection time of the ultrasonic wave and the propagation speed of the ultrasonic wave in the air.

[0069] It should be noted that how to use the sensor 610 to measure the thickness of the battery cell a is not an improvement of the present application. The above measurement method is only an exemplary description. Other measurement methods can also be used in actual measurement, which will not be repeated here.

[0070] It should be noted that, in some other embodiments, the sensor 610 may also be disposed on the second matching portion 630 , which is not limited herein.

[0071] In some of the embodiments, the first driving member 310 and the second driving member 430 are cylinders.

[0072] It should be noted that, in some other embodiments, the first driving member 310 and the second driving member 430 may be hydraulic cylinders or electric push rods, or other types of linear driving devices, which are not limited here.

[0073] Reference Figure 6 According to the battery production line of the embodiment of the present application, it includes a rack 700 and a conveying mechanism 800, the rack 700 is provided with the above-mentioned battery cell thickness measuring mechanism, and the conveying mechanism 800 is arranged on the rack 700 and is used to convey the battery cell a.

[0074] 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 mechanism, the battery production line of the embodiment of the present application has all the technical effects of the above-mentioned battery cell thickness measuring mechanism.

[0075] Reference Figure 6In some of the embodiments, at least two battery cell thickness measuring mechanisms are provided on the rack 700 along the conveying direction of the battery cell a, which is beneficial to further improve the measurement efficiency.

[0076] 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.

[0077] 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 mechanism, characterized in that: include: Bracket; A clamping assembly, comprising a first clamping member and a second clamping member movably disposed on the bracket and used for clamping the battery core, 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 the horizontal direction and is used to drive the first clamping member to move along the first direction; The second driving structure comprises a transmission part, a connecting rod and a second driving member arranged on the bracket, the two ends of the connecting rod are respectively hinged to the transmission part and the second clamping member, the second driving member has an output end that is telescopic in the vertical direction and is used to drive the transmission part to move up and down, and the transmission part is used to cooperate with the connecting rod to drive the second clamping member to move along the first direction; The sensor component is arranged on the clamping component and is used to detect the thickness of the battery core.

2. The battery cell thickness measuring mechanism according to claim 1, characterized in that: The battery cell thickness measuring mechanism has two groups of the clamping assemblies, the two groups of the clamping assemblies are arranged at intervals along the first direction, the transmission part is arranged between the two second clamping members, the two second clamping members are hinged with the connecting rod, the transmission part is used to cooperate with the connecting rod to simultaneously drive the two second clamping members to approach or move away from each other along the first direction, 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.

3. The battery thickness measuring mechanism according to claim 1 or 2, characterized in that: The battery cell thickness measuring mechanism further includes a limiting structure, the transmission part has a working position for driving the second clamping member to move to an extreme position for clamping the battery cell, and the limiting structure is used to limit the displacement of the transmission part located at the working position along the first direction.

4. The battery cell thickness measuring mechanism according to claim 3, characterized in that: The limiting structure comprises a support, a plug-in portion is arranged at the bottom of the transmission portion, and a plug-in hole for plugging the plug-in portion is arranged on the support.

5. The battery cell thickness measuring mechanism according to claim 4, characterized in that: The battery cell thickness measuring mechanism further includes a positioning structure, and the positioning structure is used to limit the stroke of the output end of the second driving member so that the working position is the limit position of the transmission part.

6. The battery cell thickness measuring mechanism according to claim 5, characterized in that: The positioning structure comprises a positioning step which is arranged on the transmission part and connected with the plug-in part, and the positioning step can be abutted against the support when the transmission part moves to the working position.

7. The battery cell thickness measuring mechanism according to claim 6, characterized in that: A buffer structure is arranged on the support corresponding to the transmission part.

8. The battery cell thickness measuring mechanism according to claim 7, characterized in that: The buffer structure comprises an elastic buffer block, which is arranged on the support and staggered with the plug hole. In the vertical direction, one end of the buffer block away from the support is higher than the insertion end of the plug hole.

9. A battery production line, characterized in that: include: A frame, on which the battery cell thickness measuring mechanism 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 mechanisms are arranged on the frame along the conveying direction of the battery cells.

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