Battery piece conveying device

By designing a battery cell conveying device with a flipable conveyor plate and a lifting drive device, the complexity and high cost of removing defective sheets during battery cell transmission in the prior art is solved, and a simple structure, high space utilization and reliability are achieved. The good-performance chip removal function avoids battery fragmentation and improves the recycling of bad films.

CN222248775UActive Publication Date: 2024-12-27TONGWEI SOLAR ENERGY (CHENGDU) CO LID
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Patent Information

Application Number
CN202420843092.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-22
Publication Date
2024-12-27
Estimated Expiration
2034-04-22

AI Technical Summary

Technical Problem

During the manufacturing process of existing battery cells, the method of removing defective sheets during the transmission process of the battery cells is complex, takes up a large space, and is costly, and it is easy to cause battery fragmentation, affecting the recycling and utilization of the removed sheets.

Method used

A battery cell conveying device is designed, using a reversible conveyor plate and lifting drive device, combined with a conveyor belt mechanism, to realize the automatic removal of bad battery cells, avoiding additional suction cup mechanism, simplifying the structure, reducing costs, and improving Space utilization.

Benefits of technology

The chip removal function is realized with a simple structure, small space, low cost and high reliability, avoiding battery fragmentation and improving the recycling efficiency of bad chips.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a battery piece conveying device. The battery piece conveying device comprises a base, a conveying mechanism and a driving mechanism, the conveying plate is provided with an upstream end and a downstream end, the conveying plate is arranged on the base between a conveying position and a sheet removing position in a turnover mode, and the position height of the downstream end, at the sheet removing position, of the conveying plate is lower than the position height of the downstream end, at the conveying position, of the conveying plate; the conveying belt mechanism is arranged on the conveying plate and is suitable for conveying the battery pieces from the upstream end to the downstream end; and the lifting driving device is in transmission connection with the conveying plate. According to the battery piece conveying device, the piece removing function can be achieved, and the battery piece conveying device has the advantages of being simple in structure, small in occupied space, high in space utilization rate, low in cost, high in reliability and the like.
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Description

Technical Field

[0001] The utility model relates to the technical field of solar cell sheet manufacturing, in particular to a cell sheet conveying device. Background Art

[0002] The manufacturing process of photovoltaic cells involves multiple steps. The cells will be quality inspected in each step, and cells that do not meet the requirements or have defects will be removed during the transportation of cells between the steps.

[0003] In the related art, the method for removing defective cells during the transmission process is to suck the cells with a suction cup, move them to the top of the removal box, and place the cells into the receiving box. This method requires the provision of a separate suction cup mechanism and a mechanism for moving the suction cup. The overall structure is complex, occupies a large space, and is costly. In addition, the suction cup easily causes cell fragments, affecting the recycling of the removed cells. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell conveying device, which can realize the cell picking function and has the advantages of simple structure, small space occupation, high space utilization, low cost, high reliability, etc.

[0005] To achieve the above-mentioned purpose, according to an embodiment of the utility model, a battery cell conveying device is proposed, and the battery cell conveying device includes: a base; a conveying plate, the conveying plate has an upstream end and a downstream end, the conveying plate is flipped on the base between a conveying position and a picking position, and the position height of the conveying plate at the downstream end of the picking position is lower than the position height of the conveying plate at the downstream end of the conveying position; a conveyor belt mechanism, the conveyor belt mechanism is arranged on the conveying plate and is suitable for conveying the battery cells from the upstream end to the downstream end; a lifting drive device, and the lifting drive device is transmission-connected to the conveying plate.

[0006] The battery cell conveying device according to the embodiment of the utility model can realize the cell picking function and has the advantages of simple structure, small space occupation, high space utilization, low cost, high reliability, etc.

[0007] In addition, the battery cell conveying device according to the above embodiment of the utility model may also have the following additional technical features:

[0008] According to one embodiment of the utility model, the lifting drive device includes: a piece picking motor; an eccentric wheel, which is connected to the piece picking motor; a connecting rod, which is pivotally connected to the conveying plate and the eccentric wheel respectively and the connecting rod is eccentrically connected to the eccentric wheel.

[0009] According to one embodiment of the utility model, the lifting drive device also includes a position detection device, a position detection feature is provided on the eccentric wheel, the position detection device is electrically connected to the picking motor and is suitable for detecting the position detection feature, and the connecting rod is located at the connection position of the eccentric wheel and the position detection feature is located on the same diameter of the eccentric wheel and are respectively located on both sides of the center of the eccentric wheel.

[0010] According to an embodiment of the present invention, the battery cell conveying device further comprises a chip picking box, and when the conveying plate is at the chip picking position, the conveyor belt mechanism is suitable for conveying the battery cells to the chip picking box.

[0011] According to an embodiment of the utility model, there is a downstream mechanism downstream of the battery cell conveying device, and when the conveying plate is in the conveying position, the conveyor belt mechanism is suitable for conveying the battery cells to the downstream mechanism, and the chip removal box is arranged below the downstream mechanism.

[0012] According to an embodiment of the utility model, a buffer pad is provided on the inner wall of the chip removal box.

[0013] According to one embodiment of the utility model, the conveyor plate is rotatably disposed on the base through a rotating shaft, and the conveyor belt mechanism includes: a conveyor belt transmission wheel, the conveyor belt transmission wheel is disposed on the rotating shaft; a conveyor belt driven wheel, the conveyor belt driven wheel is rotatably disposed on the conveyor plate; a conveyor belt, the conveyor belt is sleeved on the conveyor belt transmission wheel and the conveyor belt driven wheel; a conveyor belt driving device, the conveyor belt driving device is transmission-connected to the conveyor belt transmission wheel.

[0014] According to one embodiment of the utility model, the conveyor belt driving device includes: a conveying motor, which is arranged on the base; a driving driving wheel, which is connected to the conveying motor; a driving transmission wheel, which is arranged on the rotating shaft and rotates together with the conveyor belt transmission wheel; and a transmission belt, which is respectively sleeved on the driving driving wheel and the driving transmission wheel.

[0015] According to an embodiment of the utility model, the driven wheel of the conveyor belt is installed on the conveying plate through a driven wheel bracket, and the driven wheel bracket is movably arranged on the conveying plate along the length direction of the conveying plate.

[0016] According to an embodiment of the utility model, a battery cell sensor for detecting whether there are battery cells on the conveyor belt mechanism is provided on the conveyor plate, and the battery cell sensor is electrically connected to the lifting drive device.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a battery cell conveying device according to an embodiment of the utility model.

[0020] Figure 2 It is a structural schematic diagram of a battery cell conveying device according to an embodiment of the utility model.

[0021] Figure 3 It is a structural schematic diagram of a battery cell conveying device and a downstream mechanism according to an embodiment of the utility model.

[0022] Figure 4 It is a structural schematic diagram of a battery cell conveying device according to an embodiment of the utility model.

[0023] Figure 5 It is a structural schematic diagram of a battery cell conveying device according to an embodiment of the utility model.

[0024] Figure numerals: battery cell conveying device 1, base 10, conveying plate 20, connecting rod seat 21, conveyor belt mechanism 30, conveyor belt drive wheel 31, conveyor belt driven wheel 32, conveyor belt 33, conveying motor 34, driving active wheel 35, driving transmission wheel 36, transmission belt 37, driven wheel bracket 38, lifting drive device 40, film picking motor 41, eccentric wheel 42, connecting rod 43, position detection device 44, position detection feature 45, film picking material box 50, rotating shaft 60, battery cell sensor 70, downstream mechanism 2. DETAILED DESCRIPTION

[0025] The embodiments of the present invention 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 invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The following describes a battery cell conveying device 1 according to an embodiment of the present utility model with reference to the accompanying drawings.

[0029] like Figure 1-Figure 5 As shown, the cell conveying device 1 according to the embodiment of the utility model includes a base 10 , a conveying plate 20 , a conveying belt mechanism 30 and a lifting drive device 40 .

[0030] The conveying plate 20 has an upstream end and a downstream end. The conveying plate 20 is flippably arranged on the base 10 between the conveying position and the chip picking position. The position height of the downstream end of the conveying plate 20 at the chip picking position is lower than the position height of the downstream end of the conveying plate 20 at the conveying position. The conveyor belt mechanism 30 is arranged on the conveying plate 20 and is suitable for conveying the battery cells from the upstream end to the downstream end. The lifting drive device 40 is transmission-connected to the conveying plate 20.

[0031] Specifically, the up-down direction and the front-back direction are shown by arrows in the figure and are only for the convenience of description, and are not limitations on the actual setting direction.

[0032] The figure shows an embodiment in which the front end of the conveying plate 20 is the upstream end and the rear end of the conveying plate 20 is the downstream end.

[0033] Figure 1The middle conveying plate 20 is located at the conveying position, Figure 2 The middle conveying plate 20 is located between the conveying position and the sheet removing position.

[0034] The downstream of the cell conveying device 1 may be provided with a downstream mechanism 2 for receiving the cell. The downstream mechanism 2 may be a subsequent conveying device or a production device for performing the next process.

[0035] The battery cell conveying device 1 needs to cooperate with a defective cell detection device for detecting whether a battery cell is a defective cell.

[0036] When no defective cells are detected, the conveying plate 20 remains at the conveying position, and the battery cells are normally conveyed to the downstream mechanism 2 through the battery cell conveying device 1 to continue conveying or proceed to the next process.

[0037] After detecting the defective slice, a signal is sent to the lifting drive device 40. When the defective slice reaches the cell conveying device 1, the lifting drive device 40 drives the conveying plate 20 to flip to the said ejection position so that the defective slice is conveyed to the bottom of the downstream mechanism 2 along the conveying plate 20, so that the defective slice deviates from the original conveying route, so as to remove the defective slice from the original conveying route and realize the removal of the defective slice. The removed defective slice can be collected by a container or conveyed to other processes for processing. After that, the lifting drive device 40 drives the conveying plate 20 back to the conveying position again to ensure the normal conveyance of other cells.

[0038] According to the battery cell conveying device 1 of the embodiment of the utility model, by setting the conveying plate 20, the conveying belt mechanism 30 is set on the conveying plate 20, and the conveying belt mechanism 30 can be used to convey the battery cells, and by setting the conveying plate 20 to be flippable and setting the lifting drive device 40, the lifting drive device 40 can be used to drive the conveying plate 20 to flip between the conveying position and the picking position, so that the conveying plate 20 is kept in the conveying position when the battery cells are normally conveyed, so that the battery cells can be normally conveyed to the downstream mechanism of the battery cell conveying device 1, and the conveying plate 20 is flipped to the picking position when the defective sheet passes, so that the defective sheet deviates from the original conveying route, and the defective sheet is removed. Compared with the method of using suction cups for removal in the related art, there is no need to set up additional suction cups and suction cup moving devices, and the original mechanism of the conveying device is fully utilized to realize the removal of defective sheets, which can make the overall structure simpler, reduce the occupied space, and reduce the overall cost, and can avoid the use of suction cups to cause battery cell fragments, which is convenient for ensuring the integrity of the removed sheet and improving the reliability of the picked sheet.

[0039] Furthermore, by making the position height of the downstream end of the conveying plate 20 at the film picking position lower than the position height of the downstream end of the conveying plate 20 at the conveying position, defective films can be conveyed to the bottom of the original conveying route during film picking, thereby making full use of the space below the downstream mechanism 2 and avoiding occupying additional space above the downstream mechanism 2, thereby further improving the utilization rate of the space and making the structure more compact.

[0040] Therefore, the cell conveying device 1 according to the embodiment of the utility model can realize the cell picking function, and has the advantages of simple structure, small space occupation, high space utilization, low cost, high reliability, etc.

[0041] The following describes a battery cell conveying device 1 according to a specific embodiment of the present utility model with reference to the accompanying drawings.

[0042] In some specific embodiments of the present invention, Figure 1-Figure 5 As shown, the cell conveying device 1 according to the embodiment of the utility model includes a base 10 , a conveying plate 20 , a conveying belt mechanism 30 and a lifting drive device 40 .

[0043] Specifically, Figure 1-Figure 5 As shown, the lifting drive device 40 includes a sheet picking motor 41, an eccentric wheel 42 and a connecting rod 43. The eccentric wheel 42 is connected to the sheet picking motor 41. The connecting rod 43 is pivotally connected to the conveying plate 20 and the eccentric wheel 42 respectively, and the connecting rod 43 is eccentrically connected to the eccentric wheel 42. Specifically, a connecting rod seat 21 is provided on the conveying plate 20, and the connecting rod 43 is pivotally connected to the connecting rod seat 21. In this way, the rotation of the film picking motor 41 can drive the eccentric wheel 42 to rotate, thereby driving one end of the connecting rod 43 to make a circular motion and driving the other end of the connecting rod 43 to rise and fall, thereby realizing the flipping of the conveying plate 20. Moreover, since the film picking motor 41 only needs to rotate half a circle to complete the switching of the conveying plate 20 between the film picking position and the conveying position, the position switching speed of the conveying plate 20 can be increased, so that the conveying plate 20 can be quickly flipped to the said film picking position when a defective film arrives, and can quickly return to the conveying position after the film is picked, so that the battery cell conveying device 1 can quickly complete the film picking and reduce the impact of the film picking process on the normal conveying of the battery cells.

[0044] More specifically, Figure 1-Figure 3 and Figure 5As shown, the lifting drive device 40 also includes a position detection device 44, a position detection feature 45 is provided on the eccentric wheel 42, the position detection device 44 is electrically connected to the film picking motor 41 and is suitable for detecting the position detection feature 45, and the connection position of the connecting rod 43 at the eccentric wheel 42 and the position detection feature 45 are located on the same diameter of the eccentric wheel 42 and are respectively located on both sides of the center of the eccentric wheel 42. Specifically, the position detection feature 45 can be a groove. In this way, the position detection feature 45 can be detected by the position detection device 44 when the connecting rod 43 rotates to the highest position, so that the film picking motor 41 can be stopped in time, so that the conveying plate 20 can be kept in the conveying position, and the accuracy and reliability of the conveying plate 20 returning to the conveying position are improved to avoid affecting the normal conveying of the battery cells.

[0045] Advantageously, if Figure 3 As shown, the cell conveying device 1 further comprises a cell picking box 50. When the conveying plate 20 is at the cell picking position, the conveyor belt mechanism 30 is adapted to convey the cells to the cell picking box 50. In this way, the cell picking box 50 can be used to collect the rejected cells, facilitating the recycling of the cells.

[0046] More advantageously, if Figure 3 As shown, the downstream of the cell conveying device 1 is provided with a downstream mechanism 2, and when the conveying plate 20 is in the conveying position, the conveyor belt mechanism 30 is suitable for conveying the cell to the downstream mechanism 2, and the cell removal box 50 is arranged below the downstream mechanism 2. In this way, the space below the downstream mechanism 2 can be fully utilized, further improving the space utilization rate.

[0047] Specifically, the downstream mechanism 2 can be a conveying device, and the conveying plate 20 is kept horizontal and flush with the downstream mechanism 2 at the conveying position, so that the battery cell can maintain horizontal movement during normal conveying, which is convenient for conveying the battery cell. The conveying plate 20 extends downward from front to back at the rejection position. The rejection box 50 extends downward from front to back. This makes it easy to feed defective sheets into the rejection box 50.

[0048] Optionally, a buffer pad is provided on the inner wall of the chip picking box 50. In this way, the buffer pad can be used to buffer the battery cells fed into the chip picking box 50, so as to prevent the battery cells from colliding with the chip picking box 50 and causing fragments.

[0049] Figure 1-Figure 5 The battery sheet conveying device 1 according to some examples of the utility model is shown. Figure 1-Figure 5As shown, the conveyor plate 20 is rotatably arranged on the base 10 through the rotating shaft 60, and the conveyor belt mechanism 30 includes a conveyor belt driving wheel 31, a conveyor belt driven wheel 32, a conveyor belt 33 and a conveyor belt driving device. The conveyor belt driving wheel 31 is arranged on the rotating shaft 60. The conveyor belt driven wheel 32 is rotatably arranged on the conveyor plate 20. The conveyor belt 33 is sleeved on the conveyor belt driving wheel 31 and the conveyor belt driven wheel 32. The conveyor belt driving device is connected to the conveyor belt driving wheel 31. Specifically, the rotating shaft 60 is located at the upstream end of the conveyor plate 20, and the conveyor belt driven wheel 32 is located at the downstream end of the conveyor plate 20. In this way, the conveyor belt driving device can be used to drive the conveyor belt driving wheel 31 to rotate, and the conveyor belt driving wheel 31 can be used to drive the conveyor belt driven wheel 32 and the conveyor belt 33 to move, thereby driving the battery cells on the conveyor belt 33 to move, so as to realize the transportation of the battery cells.

[0050] Specifically, Figure 1-Figure 5 As shown, the conveyor belt driving device includes a conveyor motor 34, a driving driving wheel 35, a driving transmission wheel 36 and a transmission belt 37. The conveyor motor 34 is arranged on the base 10. The driving driving wheel 35 is connected to the conveyor motor 34. The driving transmission wheel 36 is arranged on the rotating shaft 60 and rotates together with the conveyor belt transmission wheel 31. The transmission belt 37 is respectively sleeved on the driving driving wheel 35 and the driving transmission wheel 36. In this way, the conveyor motor 34 can drive the driving driving wheel 35 to rotate, and the driving driving wheel 35 can drive the driving transmission wheel 36 and the transmission belt 37 to move, thereby driving the conveyor belt transmission wheel 31 to rotate, realizing the driving of the conveyor belt 33, and the space below the conveyor plate 20 can be fully utilized to further improve the space utilization rate.

[0051] Advantageously, if Figure 1-Figure 5 As shown, the conveyor belt driven wheel 32 is installed on the conveyor plate 20 through the driven wheel bracket 38, and the driven wheel bracket 38 is movably arranged on the conveyor plate 20 along the length direction of the conveyor plate 20. This makes it easy to keep the conveyor belt 33 tight and improve the reliability of the battery cell conveying.

[0052] More specifically, Figure 4 As shown, the conveyor plate 20 is provided with a cell sensor 70 for detecting whether there are cells on the conveyor belt mechanism 30, and the cell sensor 70 is electrically connected to the lifting drive device 40. In this way, after the bad cell detection device detects a bad cell, a signal can be sent to the cell conveying device 1. When the cell sensor 70 detects a cell, it is determined that the bad cell is on the conveyor belt mechanism 30, and the lifting drive device 40 descends to drive the conveyor plate 20 to flip to the rejection position, which is convenient for judging the flipping timing of the conveyor plate 20, so that the conveyor plate 20 can timely reject the bad cell and reset it in time, further reducing the impact on the normal conveying process of the cell.

[0053] Other structures and operations of the cell conveying device 1 according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention 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 invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery sheet conveying device, characterized in that: include: Pedestal; A conveying plate, the conveying plate having an upstream end and a downstream end, the conveying plate being flippably arranged on the base between a conveying position and a piece picking position, the position height of the conveying plate at the downstream end of the piece picking position being lower than the position height of the conveying plate at the downstream end of the conveying position; A conveyor belt mechanism, the conveyor belt mechanism is disposed on the conveyor plate and is suitable for conveying the battery sheet from the upstream end to the downstream end; A lifting drive device is drivingly connected to the conveying plate.

2. The battery sheet conveying device according to claim 1, characterized in that: The lifting drive device comprises: Flake removal motor; An eccentric wheel, wherein the eccentric wheel is connected to the sheet picking motor; A connecting rod is pivotally connected to the conveying plate and the eccentric wheel respectively and the connecting rod is eccentrically connected to the eccentric wheel.

3. The battery sheet conveying device according to claim 2, characterized in that: The lifting drive device also includes a position detection device. The eccentric wheel is provided with a position detection feature. The position detection device is electrically connected to the picking motor and is suitable for detecting the position detection feature. The connecting rod is located at the connection position of the eccentric wheel and the position detection feature is located on the same diameter of the eccentric wheel and is respectively located on both sides of the center of the eccentric wheel.

4. The battery sheet conveying device according to claim 1, characterized in that: It also includes a chip picking box, and when the conveying plate is at the chip picking position, the conveyor belt mechanism is suitable for conveying the battery cells to the chip picking box.

5. The battery sheet conveying device according to claim 4, characterized in that: A downstream mechanism is provided downstream of the battery cell conveying device. When the conveying plate is at the conveying position, the conveyor belt mechanism is suitable for conveying the battery cells to the downstream mechanism. The cell removal box is arranged below the downstream mechanism.

6. The battery sheet conveying device according to claim 4, characterized in that: The inner wall of the chip picking box is provided with a buffer pad.

7. The battery sheet conveying device according to claim 1, characterized in that: The conveyor plate is rotatably arranged on the base through a rotating shaft, and the conveyor belt mechanism includes: A conveyor belt drive wheel, wherein the conveyor belt drive wheel is arranged on the rotating shaft; A conveyor belt driven wheel, the conveyor belt driven wheel is rotatably arranged on the conveyor plate; A conveyor belt, wherein the conveyor belt is sleeved on the conveyor belt driving wheel and the conveyor belt driven wheel; A conveyor belt driving device is connected to the conveyor belt driving wheel.

8. The battery sheet conveying device according to claim 7, characterized in that: The conveyor belt driving device comprises: A conveying motor, wherein the conveying motor is arranged on the base; A driving wheel connected to the conveying motor; A driving transmission wheel, which is arranged on the rotating shaft and rotates together with the conveyor belt transmission wheel; A transmission belt is respectively sleeved on the driving active wheel and the driving transmission wheel.

9. The battery sheet conveying device according to claim 7, characterized in that: The conveyor belt driven wheel is installed on the conveying plate through a driven wheel bracket, and the driven wheel bracket is movably arranged on the conveying plate along the length direction of the conveying plate.

10. The battery sheet conveying device according to claim 1, characterized in that: The conveying plate is provided with a battery cell sensor for detecting whether there are battery cells on the conveying belt mechanism, and the battery cell sensor is electrically connected to the lifting drive device.