Soft package cell thickness measuring device

Abstract

The utility model belongs to the technical field of cell thickness measuring devices, and discloses a soft package cell thickness measuring device. The soft package battery cell thickness measuring device comprises a base, a pressing plate and a driving assembly. The base is provided with a horizontal working table, and a to-be-tested cell can be placed on the working table. The pressing plate is oppositely arranged at the initial position above the working table top, and the vertical distance between the initial position and the working table top is S1. The fixed end of the driving assembly is connected with the base, the output end of the driving assembly is connected with the pressing plate, the driving assembly can drive the pressing plate to move in the vertical direction, the position where the pressing plate vertically moves downwards to abut against the surface of the battery cell is the working position, and the vertical distance from the initial position to the working position is S2. The soft package cell thickness measuring device is high in accuracy and high in measuring efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of battery cell thickness measurement devices, and in particular to a device for measuring the thickness of soft-pack battery cells. Background Technology

[0002] Typically, pouch cells are packaged in aluminum-plastic film, which offers significant advantages in terms of size and weight compared to metal or plastic casings. Therefore, pouch cells are increasingly favored by the market due to their high energy density and long cycle life. However, during the actual manufacturing process of pouch cells, prolonged storage or charging can cause bulging, resulting in cell dimensions exceeding the allowable tolerance range. Therefore, the thickness of the cells must be remeasured before shipment to screen out qualified products.

[0003] Currently, the thickness of pouch cells is mainly measured manually. In practice, workers need to use calipers to inspect each product. Manual measurement requires positioning the calipers, repeated measurements, and calculations, which is not only inefficient but also prone to human error.

[0004] Therefore, there is an urgent need to develop a thickness measurement device for pouch cells to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a thickness measuring device for soft-pack battery cells, which has high accuracy and high measurement efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A thickness measurement device for pouch cells, comprising:

[0008] A base is provided on which a horizontal worktable is provided, on which the battery cell to be tested can be placed;

[0009] A pressure plate is positioned at an initial position above the workbench surface, with the initial position being S1 vertically distanced from the workbench surface.

[0010] A driving assembly is provided, with its fixed end connected to the base and its output end connected to the pressure plate. The driving assembly is capable of driving the pressure plate to move vertically. The position where the pressure plate moves vertically downward and abuts against the surface of the battery cell is the working position. The vertical distance from the initial position to the working position is S2.

[0011] As an optional technical solution for a soft-pack battery cell thickness measurement device, the driving assembly includes a driving component and a vertically arranged lead screw. The output end of the driving component is connected to the lead screw, and the pressure plate is rotatably connected to the lead screw. The driving component drives the lead screw to rotate so as to move the pressure plate in the vertical direction.

[0012] As an optional technical solution for a thickness measuring device for soft-pack battery cells, the lead screw is connected to the inner ring of the bearing, the outer ring of the bearing is connected to the pressure plate, and the driving component drives the lead screw to rotate and move in the vertical direction.

[0013] As an optional technical solution for the thickness measurement device of soft-pack battery cells, the drive assembly further includes a bracket, which is fixed to the base, the drive component is fixed to the bracket, and the lead screw is movably inserted through the bracket.

[0014] As an optional technical solution for the thickness measurement device of soft-pack battery cells, the driving assembly further includes a vertically arranged guide rod, one end of which is fixedly connected to the pressure plate, and the other end of which is movably connected to the bracket.

[0015] As an optional technical solution for the thickness measurement device of soft-pack battery cells, the lead screw is located at the center of the pressure plate.

[0016] As an optional technical solution for a soft-pack battery cell thickness measurement device, the number of guide rods is multiple, and the multiple guide rods are evenly spaced along the outer circumference of the lead screw.

[0017] As an optional technical solution for the thickness measurement device of soft-pack battery cells, the driving component is a motor.

[0018] As an optional technical solution for a soft-pack battery cell thickness measuring device, the pitch of the lead screw is L, the angle by which the motor drives the pressure plate to rotate from the initial position to the worktable surface is n1, and the angle by which the motor drives the pressure plate to rotate from the initial position to the working position is n2. Then, S1 = n1 × L, S2 = n2 × L.

[0019] As an optional technical solution for the thickness measurement device of soft-pack battery cells, the thickness measurement device of soft-pack battery cells also includes a pressure sensor, which is embedded in the worktable to measure the pressure of the pressure plate on the worktable and the battery cell.

[0020] The beneficial effects of this utility model are:

[0021] The flexible battery cell thickness measuring device provided by this utility model includes a base, a pressure plate, and a drive assembly. During actual measurement, the vertical distance S1 between the initial position and the worktable is recorded. This is the distance the pressure plate moves from the initial position to contact with the worktable before the battery cell is placed on it. The drive assembly then drives the pressure plate back to the initial position, and the battery cell is placed on the worktable. The drive assembly then drives the pressure plate from the initial position to the working position (when the lower pressure plate abuts against the surface of the battery cell), and the moving distance S2 of the pressure plate is recorded. The thickness of the battery cell is calculated as S1-S2. Compared to manually measuring battery cell thickness with handheld calipers, this flexible battery cell thickness measuring device measures the battery cell thickness by measuring the difference between the two moving distances of the pressure plate. It is simple to operate, highly efficient, and accurate. Furthermore, since the pressure plate abuts against the surface of the battery cell during measurement, the measured battery cell thickness is the average thickness of the battery cell, further improving the accuracy of the measurement results. Attached Figure Description

[0022] Figure 1 This is a first structural schematic diagram of the soft-pack battery cell thickness measuring device provided in this embodiment of the utility model;

[0023] Figure 2 This is a second structural schematic diagram of the soft-pack battery cell thickness measuring device provided in this embodiment of the utility model;

[0024] Figure 3 This is a first assembly drawing of the soft-pack battery cell thickness measuring device and the battery cell provided in this embodiment of the utility model;

[0025] Figure 4 This is a second assembly drawing of the soft-pack battery cell thickness measuring device and the battery cell provided in this embodiment of the utility model.

[0026] In the picture:

[0027] 10. Battery cells;

[0028] 100, base; 110, worktable; 200, pressure plate; 300, drive assembly; 310, bracket; 320, lead screw; 330, guide rod. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] This embodiment provides a thickness measuring device for pouch cells, which has high accuracy and high measurement efficiency.

[0034] Specifically, such as Figures 1 to 4 As shown, the soft-pack battery cell thickness measurement device includes a base 100, a pressure plate 200, and a drive assembly 300. The base 100 has a horizontal worktable 110 on which the battery cell 10 to be tested can be placed. The pressure plate 200 is initially positioned above the worktable 110, with a vertical distance S1 between the initial position and the worktable 110. The fixed end of the drive assembly 300 is connected to the base 100, and the output end of the drive assembly 300 is connected to the pressure plate 200. The drive assembly 300 can drive the pressure plate 200 to move vertically. The position where the pressure plate 200 moves vertically downwards and abuts against the surface of the battery cell 10 is the working position, with a vertical distance S2 between the initial position and the working position.

[0035] It should be noted that the value of S1 can be obtained from the known inherent parameters of the soft-pack battery cell thickness measuring device itself, or, like S2, from the moving distance of the pressure plate 200 (from the initial position to the point of contact with the worktable 110). In this embodiment, the pressure plate 200 is a flat plate, so S1 is the vertical distance from the surface of the pressure plate 200 facing the worktable 110 to the worktable 110 when the pressure plate 200 is in the initial position; S2 is the distance from the surface of the pressure plate 200 facing the worktable 110 to the surface of the battery cell 10 facing the pressure plate 200 when the pressure plate 200 is in the initial position.

[0036] Based on the above design, the base 100 is provided with a horizontal worktable 110, on which the battery cell 10 to be tested can be placed to ensure that the battery cell 10 is placed horizontally. The pressure plate 200 is initially positioned above the worktable 110. The fixed end of the drive assembly 300 is connected to the base 100, and the output end of the drive assembly 300 is connected to the pressure plate 200. The drive assembly 300 can drive the pressure plate 200 to move vertically. The position where the pressure plate 200 moves vertically downward and abuts against the surface of the battery cell 10 is the working position. At this time, the distance between the pressure plate 200 and the worktable 110 is the thickness of the battery cell 10. During actual measurement, the vertical distance S1 between the initial position and the worktable 110 is recorded. That is, without discharging the battery cell 10 onto the worktable 110, the drive assembly 300 drives the pressure plate 200 to move from the initial position to contact with the worktable 110. The drive assembly 300 drives the pressure plate 200 back to the initial position, and then the battery cell 10 is placed on the worktable 110. The drive assembly 300 drives the pressure plate 200 to move from the initial position to the working position (when the lower pressure plate 200 abuts against the surface of the battery cell 10), and the moving distance S2 of the pressure plate 200 is recorded. The thickness of the battery cell 10 is calculated as S1-S2. Compared to manually measuring the thickness of the battery cell 10 with handheld calipers, this soft-pack battery cell thickness measuring device measures the thickness of the battery cell 10 by measuring the difference in the distance of two movements of the pressure plate 200. It is simple to operate, highly efficient and accurate. Furthermore, during measurement, the pressure plate 200 abuts against the surface of the battery cell 10, and the measured thickness of the battery cell 10 is the average thickness of the battery cell 10, further improving the accuracy of the measurement results.

[0037] Optionally, the drive assembly 300 includes a drive element and a vertically arranged lead screw 320. The output end of the drive element is connected to the lead screw 320, and the pressure plate 200 is rotatably connected to the lead screw 320. The drive element drives the lead screw 320 to rotate, thereby moving the pressure plate 200 in the vertical direction. This soft-pack battery cell thickness measuring device converts rotation into linear motion of the pressure plate 200 through the lead screw 320, resulting in a simple driving principle and convenient operation.

[0038] Furthermore, the lead screw 320 is connected to the inner ring of the bearing, and the outer ring of the bearing is connected to the pressure plate 200. The driving component drives the lead screw 320 to rotate and move in the vertical direction. The pressure plate 200 and the lead screw 320 are connected by the bearing, which reduces the friction at the connection between the lead screw 320 and the pressure plate 200.

[0039] Furthermore, the drive assembly 300 of the soft-pack battery cell thickness measuring device also includes a bracket 310, which is fixed to the base 100. The drive component is fixed to the bracket 310, and the lead screw 320 is movably inserted through the bracket 310. That is, the lead screw 320 rotates and moves vertically relative to the bracket 310. The bracket 310 is used to fix the drive component and support the lead screw 320, thereby increasing the rotational stability of the lead screw 320 and improving the stability of the pressure plate 200 during movement.

[0040] To ensure that the pressure plate 200 moves vertically and thus ensures the accuracy of the S2 value, the drive assembly 300 of the soft-pack battery cell thickness measuring device also includes a vertically arranged guide rod 330. One end of the guide rod 330 is fixedly connected to the pressure plate 200, and the other end of the guide rod 330 is movably connected to the bracket 310, providing guidance for the vertical movement of the pressure plate 200.

[0041] In this embodiment, the lead screw 320 is located at the center of the pressure plate 200, which improves the stability of the pressure plate 200 during movement.

[0042] Furthermore, there are multiple guide rods 330, which are evenly spaced along the outer circumference of the lead screw 320. For example, the number of guide rods 330 can be two, three, four, or six.

[0043] In this embodiment, there are four guide rods 330, which are located at the four corners of the pressure plate 200.

[0044] Optionally, the driving component is a motor, which is simple to operate. Of course, in other embodiments, the lead screw 320 can be driven to rotate in other ways.

[0045] It should be noted that the values ​​of S1 and S2 can be obtained by setting a scale on the bracket 310, which allows for a simple and clear reading of the values ​​of S1 and S2, or by calculation.

[0046] If the values ​​of S1 and S2 are calculated, then the pitch of the lead screw 320 needs to be known as L, the angle of rotation of the motor-driven pressure plate 200 from its initial position to its contact with the worktable surface 110 needs to be recorded as n1, and the angle of rotation of the motor-driven pressure plate 200 from its initial position to its working position needs to be recorded as n2. Therefore, S1 = n1 × L, S2 = n2 × L, and the thickness of the battery cell 10 is S1 - S2 = n1 × L - n2 × L. This soft-pack battery cell thickness measuring device obtains high-precision data through the motor's rotation angle and the lead screw 320's pitch, improving the accuracy of the battery cell 10 thickness measurement data. The working principles of the motor and lead screw 320 are existing technologies in this field and will not be described in detail here.

[0047] Since the battery cell 10 has a soft-pack casing, to avoid damage from the pressure plate 200 and to ensure consistency in the thickness measurement of different battery cells 10, the battery cell 10 needs to be measured within a certain pressure range (usually 50N-100N). Therefore, the soft-pack battery cell thickness measuring device also includes a pressure sensor, which is embedded in the worktable 110 to measure the pressure of the pressure plate 200 on the worktable 110 and the battery cell 10. The measurement principle of the pressure sensor is prior art in this field and will not be described in detail here.

[0048] The following is the actual measurement process of cell 10:

[0049] First, position the pressure plate 200 in its initial position, set the preset pressure F of the battery cell 10, and read the pitch L of the lead screw 320.

[0050] First, without placing the battery cell 10 on the worktable 110, the motor drives the lead screw 320 to rotate and move the pressure plate 200 downward. When the pressure plate 200 is about to contact the worktable 110, it decelerates until the pressure plate 200 contacts the worktable 110 and the pressure sensor shows that the preset pressure F has been reached. Then the motor stops rotating and the rotation angle n1 of the motor is recorded.

[0051] After completion, the motor is reversed to drive the lead screw 320 to rotate in the opposite direction, which in turn drives the pressure plate 200 back to the initial position.

[0052] Then, place the battery cell 10 on the worktable 110. The motor drives the lead screw 320 to rotate again to move the pressure plate 200 downward. When the pressure plate 200 is about to contact the surface of the battery cell 10, it decelerates until the pressure plate 200 contacts the battery cell 10 and the pressure sensor displays the preset pressure F. The motor stops rotating and the rotation angle n2 of the motor is recorded.

[0053] After completion, the motor is reversed to drive the lead screw 320 to rotate in the opposite direction, causing the pressure plate 200 to return to its initial position. The battery cell 10 is then removed, and the thickness measurement of the battery cell 10 is completed.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A thickness measuring device for pouch cells, characterized in that, include: A base (100) is provided with a horizontal work surface (110) on which the battery cell (10) to be tested can be placed; A pressure plate (200) is positioned at an initial position above the workbench (110), and the vertical distance between the initial position and the workbench (110) is S1. A drive assembly (300) is provided, with its fixed end connected to the base (100) and its output end connected to the pressure plate (200). The drive assembly (300) is capable of driving the pressure plate (200) to move vertically. The position of the pressure plate (200) when it moves vertically downward and abuts against the surface of the battery cell (10) is the working position. The vertical distance from the initial position to the working position is S2.

2. The thickness measuring device for soft-pack battery cells according to claim 1, characterized in that, The drive assembly (300) includes a drive member and a vertically arranged lead screw (320). The output end of the drive member is connected to the lead screw (320). The pressure plate (200) is rotatably connected to the lead screw (320). The drive member drives the lead screw (320) to rotate so as to move the pressure plate (200) in the vertical direction.

3. The thickness measuring device for soft-pack battery cells according to claim 2, characterized in that, The lead screw (320) is connected to the inner ring of the bearing, the outer ring of the bearing is connected to the pressure plate (200), and the driving member drives the lead screw (320) to rotate and move in the vertical direction.

4. The thickness measuring device for soft-pack battery cells according to claim 3, characterized in that, The drive assembly (300) further includes a bracket (310), which is fixed to the base (100), the drive component is fixed to the bracket (310), and the lead screw (320) is movably inserted through the bracket (310).

5. The thickness measuring device for soft-pack battery cells according to claim 4, characterized in that, The drive assembly (300) further includes a vertically arranged guide rod (330), one end of which is fixedly connected to the pressure plate (200), and the other end of which is movably connected to the bracket (310).

6. The thickness measuring device for soft-pack battery cells according to claim 5, characterized in that, The lead screw (320) is located at the center of the pressure plate (200).

7. The thickness measuring device for soft-pack battery cells according to claim 6, characterized in that, The number of guide rods (330) is multiple, and the multiple guide rods (330) are evenly spaced along the outer circumference of the lead screw (320).

8. The thickness measuring device for soft-pack battery cells according to claim 2, characterized in that, The driving component is a motor.

9. The thickness measuring device for soft-pack battery cells according to claim 8, characterized in that, The pitch of the lead screw (320) is L, the angle by which the motor drives the pressure plate (200) to rotate from the initial position to abut against the worktable (110) is n1, and the angle by which the motor drives the pressure plate (200) to rotate from the initial position to the working position is n2. Then S1 = n1 × L, S2 = n2 × L.

10. The thickness measuring device for pouch cells according to claim 9, characterized in that, The soft-pack battery cell thickness measuring device also includes a pressure sensor, which is embedded in the worktable (110) to measure the pressure of the pressure plate (200) on the worktable (110) and the battery cell (10).

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