Pre-tightening force device

Abstract

The utility model discloses a pre-tightening force device, which belongs to the technical field of testing devices and comprises a single battery with a positive pole and a negative pole, a front plate, a rear plate, a fastener, a bottom supporting plate and a measuring module. The lead screw penetrates through the front plate and the rear plate and then is connected with the nut. The bottom supporting plate is arranged between the front plate and the rear plate, the bottom supporting plate, the front plate and the rear plate are enclosed to form a clamping space for placing the battery monomers, the bottom supporting plate is connected with the rear plate, and a gap is reserved between the bottom supporting plate and the front plate; and the measuring module is arranged between the rear plate and the battery monomer. According to the utility model, the technical effect of improving the accuracy and reliability of the test can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing devices, and particularly relates to a pre-tightening force device. Background Art

[0002] Pre-tightening force clamps are widely used in battery charge and discharge tests. During the charge and discharge process, electrons in the battery move actively, and long-term cycling will cause gas to be generated inside the battery, which will in turn cause the battery to expand. The pre-tightening force clamp can limit the pressure when the battery expands. However, since the battery usually expands downward, data deviation often occurs in the current pre-tightening force clamp during the pre-tightening force test, which will reduce the accuracy and reliability of the test.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is the technical problem of poor accuracy and reliability.

[0005] To solve the above technical problems, the utility model provides a pre-tightening force device, which includes: a battery cell having a positive electrode post and a negative electrode post, a front plate, a rear plate, a fastener, a bottom support plate and a measurement module. The fastener includes a lead screw and a nut matching with the lead screw. The lead screw passes through the front plate and the rear plate and is connected to the nut; the bottom support plate is arranged between the front plate and the rear plate. The bottom support plate, the front plate and the rear plate enclose a clamping space for placing the battery cell. The bottom support plate is connected to the rear plate, and there is a gap between the bottom support plate and the front plate; the measurement module is arranged between the rear plate and the battery cell.

[0006] Optionally, the front plate includes a first plate body and a first positioning hole arranged on the first plate body; the rear plate includes a second plate body and a second positioning hole arranged on the second plate body. The lead screw passes through the first positioning hole and the second positioning hole and is connected to the nut.

[0007] Optionally, the first plate body and the second plate body are parallel to each other, and the first positioning hole is directly opposite to the second positioning hole.

[0008] Optionally, the first positioning hole is a counterbore structure. One end of the lead screw is embedded in the counterbore structure, and the other end of the lead screw passes through the second positioning hole and is connected to the nut.

[0009] Optionally, a cross-shaped groove is arranged at one end of the lead screw.

[0010] Optionally, the number of the first positioning holes and the second positioning holes is four respectively. The four first positioning holes and the four second positioning holes are distributed in a one-to-one correspondence. The number of the lead screws is four. After passing through the corresponding first positioning holes and the corresponding second positioning holes, the lead screws are connected to the corresponding nuts.

[0011] Optionally, the positive electrode post and the negative electrode post are located on one side of the battery cell, the bottom support plate is located on the other side of the battery cell, and one side of the battery cell is opposite to the other side of the battery cell.

[0012] Optionally, the measurement module is located at the center of the battery cell. The measurement module includes a pressure sensor. The pre-tightening force device further includes an industrial control device, and the industrial control device is connected to the measurement module.

[0013] Optionally, the numerical range of the distance between the bottom support plate and the front plate is 2 mm to 5 mm.

[0014] Optionally, the numerical range of the pressing force applied by the front plate and the rear plate to the battery cell is 7 N to 10 N.

[0015] Beneficial effects:

[0016] The present utility model provides a pre-tightening force device. The lead screw of the fastener passes through the front plate and the rear plate and is connected to the nut. The bottom support plate is arranged between the front plate and the rear plate. The bottom support plate, the front plate and the rear plate enclose a clamping space for placing the battery cell with the positive electrode post and the negative electrode post. The bottom support plate is connected to the rear plate, and there is a gap between the bottom support plate and the front plate. The measurement module is arranged between the rear plate and the battery cell. In this way, during the charge and discharge test of the battery, the gas generated inside the battery causes the battery to expand, and the bottom of the battery will expand towards the direction close to the bottom support plate. At this time, by rotating the nut in the fastener, the lead screw is driven to move forward, and the pressing force of the front plate and the rear plate on the battery cell is gradually increased. Until reaching the preset pre-tightening state, the bottom support plate will limit and support the bottom of the battery cell, which can control the downward position deviation of the battery cell, realize the normal binding force to clamp and fix the battery cell. At the same time, the measurement module arranged between the rear plate and the battery cell can measure the pressure parameters of the battery cell in the pre-tightening state in real time, which is beneficial to accurately measure the expansion force data during charge and discharge, is easy to operate, has high safety, and then improves the accuracy and reliability of the test. Thus, the technical effect of improving the accuracy and reliability of the test is achieved. Description of the drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 FIG. 4 is a schematic structural diagram of a pre-tightening force device provided by an embodiment of the present invention.

[0019] Figure 2 FIG. 8 is a schematic structural diagram of a clamping space in a pre-tightening force device provided by an embodiment of the present invention. Detailed Embodiments

[0020] The following details the embodiments of the present application. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0021] To enable those skilled in the art of the present technology to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0022] In the embodiments of the present application, "at least one" means one or more; "a plurality" means two or more. In the description of the present application, words such as "first", "second", "third", etc. are only used for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor as indicating or implying order.

[0023] In this specification, the reference to "an embodiment" or "some embodiments" etc. means that in one or more embodiments of the present application, the specific features, structures or characteristics described in connection with the embodiment are included. Thus, the terms "include", "comprise", "have" and their variants in this specification all mean "include but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0024] It should be noted that in the embodiments of the present utility model, when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. Also, in the embodiments of the present application, "connection" can also be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present utility model are only for illustrative purposes and are not intended to limit the present utility model.

[0025] A pre-tightening force device provided by an embodiment of the present utility model is shown in Figures 1 to 2 as follows. Figure 1 It is a schematic structural diagram of a pre-tightening force device provided by an embodiment of the present utility model. Figure 2 It is a schematic structural diagram of a clamping space 51 in a pre-tightening force device provided by an embodiment of the present utility model. A pre-tightening force device provided by an embodiment of the present utility model includes a battery cell 1, a front plate 2, a rear plate 3, a fastener 4, a bottom support plate 5 and a measurement module. The battery cell 1 includes a positive electrode post 11 and a negative electrode post 12. The fastener 4 includes a lead screw 41 and a nut 42. The nut 42 is matched with the lead screw 41. The lead screw 41 passes through the front plate 2 and the rear plate 3 and is connected to the nut 42. The bottom support plate 5 is disposed between the front plate 2 and the rear plate 3. The bottom support plate 5, the front plate 2 and the rear plate 3 enclose a clamping space 51 for placing the battery cell 1. The bottom support plate 5 is connected to the rear plate 3, and there is a gap between the bottom support plate 5 and the front plate 2. The measurement module is disposed between the rear plate 3 and the battery cell 1.

[0026] Among them, the inside of the clamping space 51 has a space for accommodating the battery cell 1. There is a gap between the bottom support plate 5 and the front plate 2, so that the front plate 2 and the rear plate 3 can approach each other. During assembly, the battery cell 1 can be placed between the front plate 2 and the rear plate 3. The battery cell 1 is located on the bottom support plate 5, so that the battery cell 1 is clamped between the front plate 2 and the rear plate 3. After the lead screw 41 of the fastener 4 passes through the front plate 2 and the rear plate 3, the position of the lead screw 41 is adjusted by rotating the nut 42 to realize the adjustment of the pressing force of the front plate 2 and the rear plate 3 on the battery cell 1. The bottom support plate 5 limits and supports the bottom of the battery cell 1 to prevent the battery cell 1 from shifting downward excessively. The measurement module is closely attached to the battery cell 1, and the pressure data of the battery cell 1 in the pre-tightening state is fed back in real time through the measurement module.

[0027] In this embodiment, the screw rod 41 of the fastener 4 passes through the front plate 2 and the rear plate 3 and is connected to the nut 42. The bottom support plate 5 is arranged between the front plate 2 and the rear plate 3. The bottom support plate 5, the front plate 2 and the rear plate 3 enclose a clamping space 51 for placing the battery cell 1 having the positive electrode post 11 and the negative electrode post 12. The bottom support plate 5 is connected to the rear plate 3, and a gap is left between the bottom support plate 5 and the front plate 2. The measuring module is arranged between the rear plate 3 and the battery cell 1. In the battery charge and discharge test, the gas generated inside the battery causes the battery to expand, so that the bottom of the battery will expand towards the direction close to the bottom support plate 5. At this time, by rotating the nut 42 in the fastener 4, the screw rod 41 is driven to move forward, gradually increasing the pressing force of the front plate 2 and the rear plate 3 on the battery cell 1. Until the preset pre-tightening state is reached, the bottom support plate 5 will limit and support the bottom of the battery cell 1, which can control the downward position deviation of the battery cell 1, realize the normal binding force to clamp and fix the battery cell 1. At the same time, through the measuring module arranged between the rear plate 3 and the battery cell 1, the pressure parameters of the battery cell 1 in the pre-tightening state can be measured in real time, which is beneficial to accurately measure the expansion force data during charge and discharge, is easy to operate, has high safety, and then improves the accuracy and reliability of the test. Thus, the technical effect of improving the accuracy and reliability of the test is achieved.

[0028] As an implementation manner, the front plate 2 includes a first plate body 21 and a first positioning hole 22, and the first positioning hole 22 is arranged on the first plate body 21. The rear plate 3 includes a second plate body 31 and a second positioning hole 32, and the second positioning hole 32 is arranged on the second plate body 31. The screw rod 41 passes through the first positioning hole 22 and the second positioning hole 32 and is connected to the nut 42. In the battery charge and discharge test, as the gas is generated inside the battery and the battery expands, the bottom of the battery cell 1 has a tendency to expand towards the bottom support plate 5. At this time, by rotating the nut 42 in the fastener 4, the screw rod 41 moves forward along the first positioning hole 22 and the second positioning hole 32, pushing the front plate 2 closer to the battery cell 1. At the same time, the bottom support plate 5 provides support from below, jointly forming a clamping force on the battery cell 1. Through the first positioning hole 22 and the second positioning hole 32, the screw rod 41 will move stably along a fixed direction, ensuring the uniform application of the pre-tightening force.

[0029] In some implementation manners, the first plate body 21 and the second plate body 31 are parallel to each other, and the first positioning hole 22 is directly opposite to the second positioning hole 32. By keeping the first plate body 21 and the second plate body 31 parallel and the first positioning hole 22 directly opposite to the second positioning hole 32, the screw rod 41 can move along a predetermined straight-line trajectory under the action of rotating the nut 42, avoiding the uneven pre-tightening force caused by offset or distortion, making the adjustment of the pre-tightening force more precisely controllable, and being beneficial to improving the accuracy and reliability of the test.

[0030] In some embodiments, the first positioning hole 22 is a counterbore structure. One end of the lead screw 41 can be embedded inside the counterbore structure, and the other end of the lead screw 41 can be threadedly connected to the nut 42 after passing through the second positioning hole 32. When one end of the lead screw 41 is embedded in the counterbore structure, it enables the lead screw 41 to better disperse stress when subjected to a pre-tightening force, avoiding damage caused by local stress concentration. At the same time, embedding the lead screw 41 in the counterbore also increases the stability of the lead screw 41, making the application of the pre-tightening force more uniform and lasting.

[0031] In some embodiments, a cross-shaped groove 411 is provided at one end of the lead screw 41. The cross-shaped groove 411 makes the adjustment of the fastener 4 simpler and quicker. The operator can use a standard tool such as a cross screwdriver to rotate the lead screw 41 to accurately and quickly adjust the magnitude of the pre-tightening force, which is beneficial for saving time and labor costs.

[0032] In some embodiments, the number of the first positioning holes 22 and the second positioning holes 32 is four respectively. The four first positioning holes 22 and the four second positioning holes 32 are distributed in a one-to-one correspondence. The number of lead screws 41 is four. The lead screws 41 pass through the corresponding first positioning holes 22 and the corresponding second positioning holes 32 and are connected to the corresponding nuts 42. The four first positioning holes 22 and the four second positioning holes 32 can be respectively distributed in the included angle area. By applying the pre-tightening force to the battery cell 1 at multiple points simultaneously, the clamping effect is more uniform and firm. At the same time, the multi-point fixing method effectively prevents the position offset or deformation problems of the battery cell 1 caused by expansion during the charge and discharge process, which is beneficial for improving the accuracy and reliability of the test.

[0033] In some embodiments, the positive electrode post 11 and the negative electrode post 12 are located on one side of the battery cell 1, and the bottom support plate 5 is located on the other side of the battery cell 1. One side of the battery cell 1 is opposite to the other side of the battery cell 1. During the charge and discharge test of the battery, the generation of gas inside the battery causes the battery cell 1 to expand, especially in the bottom area of the battery cell 1. Since the positive electrode post 11 and the negative electrode post 12 are located on one side of the battery cell 1, while the bottom support plate 5 is located on the opposite side, the bottom support plate 5 can directly and effectively resist the expansion force at the bottom of the battery cell 1, that is, the bottom support plate 5 not only provides stable support but also can limit the downward position offset of the battery cell 1, ensuring the stability of the battery cell 1 during the test.

[0034] In some embodiments, the measurement module is located at the center of the battery cell 1. The measurement module includes a pressure sensor. The pre-tightening device further includes an industrial control device, and the industrial control device is connected to the measurement module. The battery cell 1 can be in a rectangular shape, and the center of the battery cell 1 is the geometric center position of the battery cell 1. By placing the measurement module at the center of the battery cell 1, the measurement error caused by position deviation can be minimized.

[0035] Those skilled in the art can understand that in a pre-tightening force device provided in an embodiment of the present invention, there are no restrictions on the specific structures of the measurement module and the industrial control device. It only needs to be realized that the pressure sensor of the measurement module can sense and transmit the pressure change of the battery cell 1 in the pre-tightened state in real time. The data collected by the pressure sensor will be processed and analyzed by the industrial control device, providing a reliable basis for evaluating the battery expansion force, facilitating the accurate measurement of the expansion force data during charge and discharge, which is beneficial to enhancing the data accuracy and real-time performance during the test and improving the reliability of the test.

[0036] In some embodiments, the numerical range of the distance between the bottom support plate 5 and the front plate 2 is 2 mm to 5 mm. By controlling the distance between the bottom support plate 5 and the front plate 2 within the range of 2 mm to 5 mm, the movement of the battery cell 1 can be restricted. At the same time, it can avoid the situation that the bottom of the battery cell 1 cannot be effectively positioned due to too large a distance, or avoid weakening the clamping effect due to too small a distance, which is beneficial to achieving a more uniform and stable pre-tightening force application.

[0037] In some embodiments, the numerical range of the pressing force applied by the front plate 2 and the rear plate 3 to the battery cell 1 is 7 N to 10 N. By controlling the pressing force within the range of 7 N to 10 N, it can not only effectively restrict the position deviation and deformation of the battery cell 1 during charge and discharge, but also avoid the situation of battery damage caused by too large a pressing force or ineffective clamping due to insufficient pressing force, which is beneficial to achieving more accurate and reliable test results.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A preload device, characterized in that: The preload device comprises: a battery cell having a positive pole and a negative pole, a front plate, a rear plate, a fastener, a bottom support plate and a measuring module, wherein the fastener comprises a screw and a nut matching the screw, wherein the screw passes through the front plate and the rear plate and is connected to the nut; the bottom support plate is arranged between the front plate and the rear plate, and the bottom support plate, the front plate and the rear plate together form a clamping space for placing the battery cell, the bottom support plate is connected to the rear plate, and a gap is left between the bottom support plate and the front plate; the measuring module is arranged between the rear plate and the battery cell.

2. The preload device according to claim 1, characterized in that: The front plate includes a first plate body and a first positioning hole arranged in the first plate body; the rear plate includes a second plate body and a second positioning hole arranged in the second plate body, and the screw rod passes through the first positioning hole and the second positioning hole and then is connected to the nut.

3. The preload device according to claim 2, characterized in that: The first plate body and the second plate body are parallel, and the first positioning hole is opposite to the second positioning hole.

4. The preload device according to claim 2, characterized in that: The first positioning hole is a countersunk hole structure, one end of the screw rod is embedded in the countersunk hole structure, and the other end of the screw rod passes through the second positioning hole and is connected to the nut.

5. The preload device according to claim 4, characterized in that: A cross groove is arranged at one end of the screw rod.

6. The preload device according to claim 2, characterized in that: The number of the first positioning holes and the number of the second positioning holes are four respectively, and the four first positioning holes and the four second positioning holes are distributed in one-to-one correspondence. The number of the screw rods is four, and the screw rods pass through the corresponding first positioning holes and the corresponding second positioning holes and then are connected with the corresponding nuts.

7. The preload device according to claim 1, characterized in that: The positive electrode column and the negative electrode column are located on one side of the battery cell, and the bottom support plate is located on the other side of the battery cell. One side of the battery cell is opposite to the other side of the battery cell.

8. The preload device according to claim 1, characterized in that: The measuring module is located at the center of the battery cell, and the measuring module includes a pressure sensor; the preload force device also includes an industrial control device, and the industrial control device is connected to the measuring module.

9. The preload device according to claim 1, characterized in that: The distance between the bottom support plate and the front plate ranges from 2 mm to 5 mm.

10. The preload device according to claim 1, characterized in that: The compression force applied by the front plate and the rear plate to the battery cell has a value ranging from 7N to 10N.

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