A flexible clamp pressure maintaining method based on connecting rod self-locking and formation and component distribution equipment

Abstract

This application relates to the field of battery cell manufacturing technology, specifically disclosing a flexible clamp pressure-holding method and a cell formation and capacity-building device based on a self-locking linkage. The method includes: controlling a pressure plate to press down relative to a support member, and controlling a linkage between the pressure plate and the support member to move vertically. After the linkage moves to the vertical position, a flexible clamp located between the pressure plate and the battery cell presses the battery cell firmly. The linkage is configured to maintain the vertical position under the force in the direction of the pressure plate and to release the vertical position under the force in the unlocking direction. In this solution, the thrust applied by the flexible clamp to the pressure plate is directly transmitted to the support member through the vertical linkage, maintaining the stability of the pressure plate during the pressing process, thereby maintaining the stability of the pressing effect under the supporting and limiting effect of the pressure plate on the flexible clamp.

Description

Technical Field

[0001] This application relates to the field of battery cell manufacturing technology, and in particular to a flexible clamp pressure-holding method based on linkage self-locking and a batching and capacity-maintaining device. Background Technology

[0002] The formation and capacity testing process is the process of transforming a battery cell from a semi-finished product into a qualified finished product. Formation involves the first controlled charge and discharge treatment of the battery cell after electrolyte injection and settling. This process activates the electrochemical active materials of the positive and negative electrodes of the battery cell, and at the same time forms a stable and dense solid electrolyte interface film on the surface of the negative electrode, enabling the battery cell to initially possess stable charge and discharge capabilities. Capacity testing, on the other hand, involves accurately testing the key electrical performance parameters of the battery cell, such as actual capacity, internal resistance, and open-circuit voltage, according to industry standard charge and discharge procedures after the formation process. Based on the test results, the battery cells are graded and screened, and those that do not meet the performance standards are eliminated, ensuring that the battery cells entering the subsequent assembly stage have good performance consistency.

[0003] During the formation and capacity testing process, pressing the cell tightly allows the internal positive and negative electrode plates to adhere closely to the separator, reducing the contact resistance inside the cell and ensuring that the electrochemical reaction in the formation process is fully carried out. In addition, the cell will undergo slight volume expansion and contraction during charging and discharging. The pressing force applied to the cell can maintain the stability of the internal structure of the cell and prevent situations such as direct contact between the positive and negative electrode plates due to changes in the cell volume.

[0004] An airbag clamp is a method of flexibly pressurizing battery cells. It works by introducing compressed air into the airbag to inflate it and distribute pressure evenly to the surface of the battery cell. After the airbag is pressurized, the reaction force of the battery cell pushes the airbag away from the battery cell, causing fluctuations in the clamping force of the airbag and affecting the stability of the clamping effect. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a flexible clamp pressure-holding method and a batching and dispensing device based on linkage self-locking to solve the above problems.

[0006] To achieve the above technical objectives, this application provides a flexible clamp pressure-maintaining method based on linkage self-locking, comprising:

[0007] The pressure plate is controlled to press down relative to the support member, and the connecting rod between the pressure plate and the support member is controlled to move into a vertical position;

[0008] After the connecting rod moves to a vertical position, the flexible clamp located between the pressure plate and the battery cell presses the battery cell tightly.

[0009] The linkage is configured to maintain the vertical state under the action of a force in the direction of the pressure plate in the vertical state, and to release the vertical state under the action of a force in the unlocking direction.

[0010] Furthermore, the control of pressing the pressure plate down relative to the support member, and controlling the linkage between the pressure plate and the support member to move vertically, includes:

[0011] The control drive plate is pressed down relative to the support member, and a transmission rod is hinged to the drive plate and the transmission rod is hinged to the connecting rod.

[0012] The downward-pressing drive plate drives the transmission rod to push the connecting rod to move towards the vertical position;

[0013] The connecting rod, which moves toward the vertical position, pushes the pressure plate downward relative to the support member.

[0014] Furthermore, after the connecting rod moves to a vertical position, the flexible clamp located between the pressure plate and the battery cell presses the battery cell tightly, and then the process further includes:

[0015] Control the drive plate to rise relative to the support member;

[0016] The rising drive plate drives the transmission rod to apply a force in the unlocking direction to the connecting rod, thereby causing the connecting rod to move to a non-vertical state;

[0017] The linkage moves the pressure plate upward relative to the support member as it moves to the non-vertical position.

[0018] Furthermore, the link includes a first link and a second link;

[0019] One end of the first connecting rod is hinged to the support member, and the other end of the first connecting rod is hinged to one end of the second connecting rod;

[0020] The other end of the second connecting rod is hinged to the pressure plate;

[0021] The transmission rod is hinged to either the first connecting rod or the second connecting rod;

[0022] In the vertical state, the first connecting rod and the second connecting rod are connected in a vertical straight line.

[0023] Furthermore, when the connecting rod moves to the vertical state, the transmission rod is in a horizontal state.

[0024] Furthermore, the pressure plate is provided with buffer pillars;

[0025] When the pressure plate is pressed down to the preset position, the drive plate abuts against the buffer post.

[0026] Furthermore, a limit block is provided on the support member;

[0027] When the connecting rod moves to the vertical state, the side of the connecting rod in the horizontal direction abuts against the limiting block.

[0028] Furthermore, the flexible clamp is an airbag;

[0029] The flexible clamp located between the pressure plate and the battery cell presses the battery cell together, including:

[0030] The airbag located between the pressure plate and the battery cell is inflated to compress the battery cell.

[0031] Furthermore, it also includes driving components;

[0032] The drive component is used to control the pressure plate to press down and to control the movement of the connecting rod;

[0033] During the process of the flexible clamp pressing the battery cell, the drive component maintains its output pressure unchanged.

[0034] The second aspect of this application provides a decomposition and capacity-maintaining device for performing the flexible clamp pressure-holding method based on linkage self-locking as described in any of the above claims, and includes: a flexible clamp, a support member, a pressure plate, a linkage, and a device body;

[0035] The main body of the device is equipped with a loading station for placing battery cells;

[0036] The support member is disposed on the main body of the device;

[0037] The pressure plate is vertically and flexibly mounted on the support member;

[0038] The flexible clamp is disposed between the pressure plate and the loading station, and is used to press the battery cell on the loading station;

[0039] The connecting rod hinges the pressure plate to the support member.

[0040] As can be seen from the above technical solutions, this application provides a flexible clamp pressure-holding method and a cell-forming and capacity-determining device based on a self-locking linkage; wherein, the method includes: controlling a pressure plate to press down relative to a support member, and controlling a linkage between the pressure plate and the support member to move to a vertical state; after the linkage moves to the vertical state, a flexible clamp located between the pressure plate and the cell presses the cell tightly; the linkage is configured to maintain the vertical state under the action of a force in the direction of the pressure plate, and to release the vertical state under the action of a force in the unlocking direction.

[0041] After the pressure plate descends to the preset position, the flexible clamp can press the battery cell tightly. During the pressing process, the battery cell generates a reaction force, which is transmitted to the pressure plate through the flexible clamp, causing the connecting rod to be subjected to a force in the direction of the pressure plate. In this solution, the force in the direction of the pressure plate is directly transmitted to the support through the vertical connecting rod, so that the connecting rod can remain in a vertical state, thereby maintaining the stability of the pressure plate during the pressing process, and maintaining the stability of the pressing effect on the battery cell under the support and limiting effect of the pressure plate on the flexible clamp. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A partial structural schematic diagram of the flexible clamping device used in a flexible clamping pressure-holding method based on linkage self-locking provided in an embodiment of this application;

[0044] Figure 2 A schematic diagram of the overall structure of the flexible clamping device used in a flexible clamping pressure-holding method based on linkage self-locking provided in this application embodiment;

[0045] Figure 3 A partial structural schematic diagram of a flexible clamping device used in a flexible clamping pressure-holding method based on linkage self-locking, provided for another embodiment of this application;

[0046] Figure 4 A schematic diagram of the connecting rod of the flexible clamping device in a non-vertical state, which is used in a flexible clamping pressure-holding method based on connecting rod self-locking provided in an embodiment of this application.

[0047] In the diagram: 10, driving component; 11, driving plate; 12, transmission rod; 13, output block; 14, second limiting block; 20, pressure plate; 30, support component; 31, limiting block; 40, connecting rod; 41, first connecting rod; 42, second connecting rod; 50, second driving component; 100, main body of the device; 110, loading station. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0049] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0051] Please see Figure 1 and Figure 2 This application provides a flexible clamping pressure-holding method based on linkage self-locking, which can be executed by a flexible clamping device. The structure of the flexible clamping device can be as follows: Figure 2 As shown, it includes a device body 100 and a drive member 10 disposed on the device body 100. A loading station 110 is provided on the device body 100. The loading station 110 can load battery cells. After the battery cell is loaded, the drive member 10 can drive the pressure plate 20 to descend, thereby bringing a flexible clamp (e.g., an airbag) closer to the battery cell and pressing it firmly. The flexible clamp can be disposed below the pressure plate 20, allowing it to move up and down with the pressure plate 20. Correspondingly, during battery cell loading and unloading, the drive member 10 drives the pressure plate 20 to rise, moving the flexible clamp away from the battery cell to facilitate battery cell loading and unloading.

[0052] Specifically, the flexible clamp pressure-holding method provided in this embodiment includes a pressing process and a pressure-releasing process.

[0053] The pressing process may include the following steps:

[0054] S1. Control the pressure plate 20 to press down relative to the support member 30, and control the connecting rod 40 between the pressure plate 20 and the support member 30 to move in a vertical state;

[0055] The support member 30 can be fixed to the main body 100 of the device or integrated with the main body 100 of the device. The lifting and lowering of the pressure plate 20 can be controlled by the drive member 10, which can be a cylinder, and the drive member 10 can drive the pressure plate 20 downward by direct or indirect driving. The connecting rod 40 can include multiple rods that are hinged to each other; during the pressing of the pressure plate 20, the rods will rotate. The movement of the connecting rod 40 to the vertical state means that at least two rods move to the vertical state and are connected in a straight line. At this time, the force in the direction of the pressure plate 20 is an upward thrust, which will be transmitted to the support member 30 through the vertical connecting rod, so that the pressure plate 20 cannot be pushed by the upward thrust.

[0056] In this embodiment, when the pressure plate 20 is pressed down to the preset position, the connecting rod 40 moves to the vertical state.

[0057] S2, after the connecting rod 40 moves to the vertical position, the flexible clamp located between the pressure plate 20 and the battery cell presses the battery cell tightly.

[0058] In this embodiment, during the process of the flexible clamp pressing the battery cell, the reaction force of the battery cell will exert a pushing force on the pressure plate 20 through the flexible clamp, so that the connecting rod 40 is subjected to a force in the direction of the pressure plate 20.

[0059] Specifically, in one implementation, the flexible clamp can be configured to press down along with the pressure plate 20. That is, during the pressing process of the pressure plate 20, the flexible clamp gradually approaches the battery cell, and when the pressure plate 20 is pressed down to a preset position, the flexible clamp presses the battery cell firmly. In another implementation, the flexible clamp can also be an airbag; after the pressure plate 20 is pressed down to the preset position, the aforementioned flexible clamp pressing the battery cell can be achieved by inflating the airbag located between the pressure plate 20 and the battery cell, thus pressing the battery cell firmly. In general, the preset position in this embodiment is the position of the pressure plate 20 during the pressing process of the battery cell.

[0060] In this embodiment, the connecting rod 40 is configured to maintain a vertical state under the force in the direction of the pressure plate 20 in the vertical state, and to release the vertical state under the force in the unlocking direction.

[0061] Specifically, during the process of the flexible clamp pressing the battery cell, the battery cell will generate an upward reaction force on the flexible clamp, which is the force in the direction of the pressure plate 20 mentioned above. This thrust will be transmitted to the support member 30 through the vertical connecting rod 40. The vertical connecting rod 40 will not generate a horizontal component force and deform, so it can remain in a vertical state and provide a stable pressure holding support effect for the pressure plate 20.

[0062] In this embodiment, the unlocking direction intersects with the vertical direction, specifically referring to the direction that can generate a horizontal component force. Specifically, when the link 40 is subjected to a force that can generate a horizontal component force, and this force is greater than the unlocking threshold of the link, the link 40 will move to a non-vertical state to release the vertical state.

[0063] After the cell is pressed and the required processes are completed, such as the formation and capacity testing process, the pressing process described above is considered complete, and the pressure release process begins.

[0064] The decompression process may include the following steps:

[0065] S3. Control the pressure plate 20 to rise relative to the support member 30, and drive the connecting rod 40 to move to a non-vertical state.

[0066] The drive unit 10 can drive the pressure plate 20 to rise directly or indirectly. After the pressure release process is completed, the battery cell on the loading station 110 can be removed and a new battery cell can be installed to perform the pressing process for the next battery cell.

[0067] In this embodiment, during the process of the flexible clamp pressing the battery cell, the pressure plate 20 is supported by the vertical connecting rod 40 and can be kept in a preset position, providing stable support for the flexible clamp and realizing full pressure maintenance of the flexible clamp during the battery cell pressing process, reducing the fluctuation of the pressing force.

[0068] In one embodiment, the drive unit 10 can be directly connected to the pressure plate 20, such as... Figure 3 As shown. The driving component 10 acts as a cylinder, with its output end connected to the pressure plate 20 to directly drive the pressure plate 20 to rise and fall. When the connecting rod 40 moves to the vertical position, the entire assembly forms a vertical straight line. To prevent the driving component 10 from failing to pull the pressure plate 20 upward, a second driving component 50 can be provided in this embodiment. The second driving component 50 can provide horizontal support for the connecting rod 40 when it moves to the vertical position. At the same time, when the pressure plate 20 needs to rise, the output end of the second driving component 50 extends to push the connecting rod 40 to a non-vertical position, thereby enabling the driving component 10 to pull the pressure plate 20.

[0069] In one embodiment, the drive member 10 drives the pressure plate 20 indirectly. Specifically, the output end of the drive member 10 is connected to the drive plate 11, meaning that after the drive member 10 is started, it can directly drive the drive plate 11 to rise and fall. One end of the transmission rod 12 is hinged to the drive plate 11. The other end of the transmission rod 12 is hinged to the connecting rod 40.

[0070] Step S1 above includes:

[0071] S11, the control drive plate 11 is pressed down relative to the support member 30, and a transmission rod 12 is hinged on the drive plate 11, and the transmission rod 12 is hinged to the connecting rod 40.

[0072] S12, the downward-pressing drive plate 11 drives the transmission rod 12 to push the connecting rod 40 to move in a vertical position;

[0073] S13, The connecting rod 40, which moves to a vertical position, pushes the pressure plate 20 downward relative to the support member 30.

[0074] Specifically, in this embodiment, the driving member 10 drives the pressure plate 20 to rise and fall through the driving plate 11, the transmission rod 12 and the connecting rod 40. In this way, the driving plate 11 can output horizontal driving force to the connecting rod 40 through the transmission rod 12 without the need to set up a second driving member 50.

[0075] Correspondingly, step S3 includes:

[0076] S31, The control drive board 11 rises relative to the support member 30;

[0077] S32, The rising drive plate 11 drives the transmission rod 12 to pull the connecting rod 40, so as to drive the connecting rod 40 to move in a non-vertical state;

[0078] S32, the non-vertical motion linkage 40 pulls the pressure plate 20 upward relative to the support member 30.

[0079] For a more specific embodiment, please refer to Figure 1 and Figure 4 The connecting rod 40 includes a first connecting rod 41 and a second connecting rod 42; one end of the first connecting rod 41 is hinged to the support member 30, and the other end of the first connecting rod 41 is hinged to one end of the second connecting rod 42; the other end of the second connecting rod 42 is hinged to the pressure plate 20; the transmission rod 12 is hinged to the first connecting rod 41 or the second connecting rod 42; in the vertical state, the first connecting rod 41 and the second connecting rod 42 are connected in a vertical state.

[0080] In this embodiment, two connecting rods 40 can be provided, symmetrically arranged on both sides of the drive plate 11. The transmission rod 12 can be located inside the connecting rod 40. For example... Figure 1 As shown, when the connecting rod 40 moves to the vertical position, the transmission rod 12 is in a horizontal position. At this time, the transmission rod 12 can provide horizontal support for the inner side of the connecting rod 40, improving the stability of the connecting rod 40 in the vertical position. During the upward movement of the drive plate 11, the transmission rod 12 can pull the connecting rod 40 inward, causing the first connecting rod 41 and the second connecting rod 42 to be pulled inward and released from the vertical position. During the downward movement of the drive plate 11, the transmission rod 12 pushes the connecting rod 40 outward, causing the first connecting rod 41 and the second connecting rod 42 to be pushed outward and move towards the vertical position.

[0081] In one embodiment, a buffer post 21 is provided on the pressure plate 20; when the pressure plate 20 is pressed down to a preset position, the drive plate 11 abuts against the buffer post 21.

[0082] The buffer post 21 provides positioning support for the downward-pressing drive plate 11 and absorbs impact force through its elastic structure. Furthermore, when the pressure plate 20 is pressed down to the preset position, the pressure plate 20 is directly connected to the drive plate 11 through the buffer post 21, which further improves the positional stability of the pressure plate 20.

[0083] In one embodiment, the buffer post 21 may include a screw threadedly connected to the pressure plate 20, and a rubber pad is provided above the screw.

[0084] In one embodiment, a limiting block 31 is provided on the support member 30; when the connecting rod 40 moves to the vertical state, the side of the connecting rod 40 abuts against the limiting block 31 in the horizontal direction.

[0085] Specifically, with the transmission rod 12 in place, the limiting block 31 is located on the outside of the connecting rod 40, that is, on the side of the connecting rod 40 facing away from the transmission rod 12. The limiting block 31 can provide a limit for the connecting rod 40 during its vertical movement, preventing excessive movement of the connecting rod 40; furthermore, the limiting block 31 can share the horizontal component force on the connecting rod 40, thereby improving the stability of the pressure plate 20 during the process of the airbag pressing the battery cell.

[0086] In one embodiment, the output end of the drive unit 10 is provided with an output block 13; a second limiting block 14 is fixedly provided on the drive plate 11; the top and bottom ends of the output block 13 respectively abut against the drive plate 11 and the second limiting block 14.

[0087] In this embodiment, the second limiting block 14 can be welded and fixed to the drive plate 11. Through the output block 13 and the second limiting block 14, the output block 13 can transmit upward and downward forces to the drive plate 11 in a pushing manner, thereby improving the effectiveness and stability of the lifting process.

[0088] In one implementation, the second limiting block 14 can be a hollow structure in the middle, so that the top and bottom of the output block 13 both abut against the second limiting block 14. In other words, in this case, the top of the output block 13 abuts against the drive plate 11 through the second limiting block 14, so that the output block 13 can drive the drive plate 11 to move by pushing when it is raised or lowered.

[0089] In one embodiment, during step S2, as the flexible clamp presses the battery cell, the drive unit 10 maintains its output pressure unchanged to further enhance the pressure holding effect on the pressure plate 20.

[0090] Specifically, during the pressure holding process, the horizontal component of the force from the connecting rod 40 is transmitted to the drive plate 11 via the transmission rod 12. Maintaining a constant output pressure with the drive component 10 improves the stability of the positions of the output block 13 and the drive plate 11, ensuring that the horizontal component is canceled out.

[0091] In the embodiments provided in this application, a second aspect provides a batching and capacity-maintaining device for performing the flexible clamping pressure-holding method based on linkage self-locking in any of the above embodiments. Specifically, the device includes: a flexible clamp, a support member 30, a pressure plate 20, a connecting rod 40, and a device body 100; the device body 100 is provided with a loading station 110 for placing battery cells; the support member 30 is disposed on the device body 100; the pressure plate 20 is movably disposed on the support member 30; the flexible clamp is disposed between the pressure plate 20 and the loading station 110 for pressing the battery cells on the loading station 110; the connecting rod 40 hinges the pressure plate 20 and the support member 30.

[0092] In the formation and capacity testing equipment provided in this embodiment, the flexible clamp can be an airbag. The airbag can be positioned below the pressure plate 20 and can rise and fall with the pressure plate 20. After the pressure plate 20 is pressed down to a preset position, the airbag begins to inflate to compress the battery cell. Furthermore, after the pressure plate 20 is pressed down to the preset position, the connecting rod 40 can remain vertical, providing stable support for the pressure plate 20, achieving pressure maintenance throughout the process of the airbag compressing the battery cell, and reducing fluctuations in the compression force.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for maintaining pressure in a flexible clamp based on linkage self-locking, characterized in that, include: The pressure plate (20) is pressed down relative to the support member (30), and the connecting rod (40) between the pressure plate (20) and the support member (30) is controlled to move in a vertical state; After the connecting rod (40) moves to the vertical position, the flexible clamp located between the pressure plate (20) and the battery cell will press the battery cell tightly; The link (40) is configured to maintain the vertical state under the action of a force in the direction of the pressure plate (20) in the vertical state, and to release the vertical state under the action of a force in the unlocking direction.

2. The method for maintaining pressure in a flexible clamp based on linkage self-locking according to claim 1, characterized in that, The control plate (20) presses down relative to the support member (30), and controls the connecting rod (40) between the plate (20) and the support member (30) to move vertically, including: The control drive plate (11) is pressed down relative to the support member (30), and a transmission rod (12) is hinged on the drive plate (11) and the transmission rod (12) is hinged to the connecting rod (40). The downward-pressing drive plate (11) drives the transmission rod (12) to push the connecting rod (40) to move towards the vertical position; The connecting rod (40), which moves toward the vertical position, pushes the pressure plate (20) downward relative to the support (30).

3. The flexible clamp pressure-holding method based on linkage self-locking according to claim 2, characterized in that, After the connecting rod (40) moves to a vertical position, the flexible clamp located between the pressure plate (20) and the battery cell presses the battery cell tightly, and then the following is also included: Control the drive plate (11) to rise relative to the support member (30); The rising drive plate (11) drives the transmission rod (12) to apply a force in the unlocking direction to the connecting rod (40), so as to drive the connecting rod (40) to move in a non-vertical state; The connecting rod (40), which is moving to the non-vertical state, pulls the pressure plate (20) upward relative to the support member (30).

4. The flexible clamp pressure-holding method based on linkage self-locking according to claim 2 or 3, characterized in that, The link (40) includes a first link (41) and a second link (42). One end of the first connecting rod (41) is hinged to the support member (30), and the other end of the first connecting rod (41) is hinged to one end of the second connecting rod (42); The other end of the second link (42) is hinged to the pressure plate (20); The transmission rod (12) is hinged to the first connecting rod (41) or the second connecting rod (42). In the vertical state, the first connecting rod (41) and the second connecting rod (42) are connected in a vertical straight line.

5. The flexible clamp pressure-holding method based on linkage self-locking according to claim 4, characterized in that, When the connecting rod (40) moves to the vertical state, the transmission rod (12) is in the horizontal state.

6. The flexible clamp pressure-holding method based on linkage self-locking according to claim 2, characterized in that, The pressure plate (20) is provided with a buffer column (21); When the pressure plate (20) is pressed down to the preset position, the drive plate (11) abuts against the buffer column (21).

7. The flexible clamp pressure-holding method based on linkage self-locking according to claim 1 or 6, characterized in that, A limit block (31) is provided on the support member (30); When the connecting rod (40) moves to the vertical state, the side of the connecting rod (40) in the horizontal direction abuts against the limiting block (31).

8. The method for maintaining pressure in a flexible clamp based on linkage self-locking according to claim 2, characterized in that, The flexible clamp is an airbag; The flexible clamp located between the pressure plate (20) and the battery cell presses the battery cell together, including: The airbag located between the pressure plate (20) and the battery cell is inflated to press the battery cell tightly.

9. The method for maintaining pressure in a flexible clamp based on linkage self-locking according to claim 1, characterized in that, It also includes a drive unit (10); The drive component is used to control the pressure plate (20) to press down and to control the movement of the connecting rod (40); During the process of the flexible clamp pressing the battery cell, the drive unit (10) maintains its output pressure unchanged.

10. A chemical composition and capacity testing device, characterized in that, The device is used to perform the flexible clamp pressure holding method based on linkage self-locking as described in any one of claims 1 to 9, and includes: a flexible clamp, a support (30), a pressure plate (20), a linkage (40), and a device body (100). The main body (100) of the device is provided with a loading station (110) for placing battery cells. The support member (30) is disposed on the main body (100) of the device; The pressure plate (20) is vertically mounted on the support member (30); The flexible clamp is disposed between the pressure plate (20) and the loading station (110) for pressing the battery cell on the loading station (110); The connecting rod (40) is hinged to the pressure plate (20) and the support member (30).

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