Battery cell expansive force testing device and battery cell expansive force testing system

Abstract

The utility model discloses a battery cell expansive force testing device and a battery cell expansive force testing system. The battery cell expansion force testing device comprises a first fixing plate, a second fixing plate, a first pressing plate, a second pressing plate, an adjusting bolt, an elastic piece, a pressure sensor and a temperature sensor, wherein the first fixing plate and the second fixing plate are oppositely arranged; the first pressing plate and the second pressing plate are oppositely arranged and located between the first fixing plate and the second fixing plate. The adjusting bolt penetrates through the second fixing plate and abuts against the second pressing plate. The elastic piece abuts against the first pressing plate and the second pressing plate. The pressure sensor is located between the first pressing plate and the second pressing plate. The temperature sensor is located between the first fixing plate and the first pressing plate. According to the embodiment of the invention, the pressure is applied by adjusting the bolt, so that the accurate pressure control on the battery cell can be realized, and the pressure on the battery cell can be uniform. And the actual performance of the battery cell is visually reflected through the temperature sensor and the pressure sensor. The structure is simple, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of cell testing, in particular to a cell expansion force testing device and a cell expansion force testing system. Background Art

[0002] During the charging and discharging process of the cell, chemical reactions will occur, resulting in the generation of internal pressure in the cell, which will cause changes in the size of the cell and ultimately affect the life and safety performance of the cell. Therefore, it is very necessary to study the internal pressure during the charging and discharging process of the cell.

[0003] The current simple test method is to clamp the cell with an organic glass plate and a dovetail clip for testing. This method can only compare the differences between clamping and pressurizing the cell and not pressurizing the cell, and cannot accurately analyze the influence of pressure on the cell. Moreover, the clamping pressure of the dovetail clip cannot be accurately controlled, and the strength of the organic glass is insufficient, and slight deformation will also occur during the expansion process of the cell. There is also a method of clamping the cell with two metal plates and then controlling the pressure with a torque wrench for testing. This method applies a constant pressure, but during the charging and discharging process of the cell, it is a complex chemical reaction, and its internal pressure is not a constant value. Therefore, this method cannot accurately analyze the influence of pressure on the cell performance.

[0004] In summary, the existing cell test methods cannot accurately analyze the influence of pressure on the cell performance. Summary of the Utility Model

[0005] The purpose of this application is to overcome the above technical deficiencies, and propose a cell expansion force testing device and a cell expansion force testing system to solve the technical problem that the influence of pressure on the cell performance cannot be accurately analyzed in the existing technology.

[0006] To achieve the above technical purpose, this application adopts the following technical solutions:

[0007] In the first aspect, this application provides a cell expansion force testing device, including a first fixing plate, a second fixing plate, a first pressing plate, a second pressing plate, an adjusting bolt, an elastic member, a pressure sensor, and a temperature sensor:

[0008] The first fixing plate and the second fixing plate are oppositely arranged;

[0009] The first pressing plate and the second pressing plate are oppositely arranged and are both located between the first fixing plate and the second fixing plate;

[0010] The adjusting bolt penetrates through the second fixing plate and abuts against the second pressing plate;

[0011] An elastic member, which is respectively in contact with the first pressing plate and the second pressing plate;

[0012] A pressure sensor, which is located between the first pressing plate and the second pressing plate; and

[0013] A temperature sensor, which is located between the first fixing plate and the first pressing plate.

[0014] In some embodiments of the present application, a support column is further included. The support column penetrates through the first pressing plate and the second pressing plate and is respectively in contact with the first fixing plate and the second fixing plate.

[0015] In some embodiments of the present application, a first sinking groove is provided on one side of the first fixing plate facing the second fixing plate, and a second sinking groove is provided on one side of the second fixing plate facing the first fixing plate. Both ends of the support column are respectively embedded in the first sinking groove and the second sinking groove.

[0016] In some embodiments of the present application, a plurality of mounting screws are further included. The first fixing plate has a first through hole, and the second fixing plate has a second through hole. The mounting screws are threadedly connected to the support column through the first through hole on the first fixing plate and are threadedly connected to the support column through the second through hole on the second fixing plate.

[0017] In some embodiments of the present application, the second fixing plate has a threaded hole, and the side wall of the adjusting bolt is threadedly connected to the second fixing plate through the threaded hole.

[0018] In some embodiments of the present application, the elastic member includes a spring, and the spring is sleeved outside the support column.

[0019] In some embodiments of the present application, a third sinking groove is provided on one side of the first pressing plate facing the second pressing plate, and a fourth sinking groove is provided on one side of the second pressing plate facing the first pressing plate. Both ends of the spring are respectively embedded in the third sinking groove and the fourth sinking groove.

[0020] In some embodiments of the present application, a third through hole is provided on one side of the first pressing plate facing the second pressing plate, and a fourth through hole is provided on one side of the second pressing plate facing the first pressing plate. The support column passes through the third through hole and the fourth through hole.

[0021] In some embodiments of the present application, a dug-out groove is provided on one side of the first pressing plate facing the first fixing plate, or a dug-out groove is provided on one side of the first fixing plate facing the first pressing plate. The inner contour of the dug-out groove matches the outer contour of the temperature sensor, and the temperature sensor is embedded in the dug-out groove.

[0022] In a second aspect, the present application also provides a battery cell expansion force testing system, including a test battery cell and a battery cell expansion force testing device as described in any embodiment of the first aspect; wherein, the test battery cell is located between the first fixing plate and the first pressing plate of the battery cell expansion force testing device and is in contact with a temperature sensor.

[0023] Compared with the prior art, the beneficial technical effects brought by the technical solution provided by the present application include:

[0024] In the embodiment of the present application, by adjusting the bolts to apply pressure to the second pressing plate and the first pressing plate and then transmitting it to the battery cell, precise pressure control of the battery cell can be achieved, and the pressure received by the battery cell can also be made uniform, which helps to improve the overall performance and safety of the battery pack. Also, by designing the temperature sensor and the pressure sensor, the temperature and pressure data of the battery cell during the test can be uploaded in real time, intuitively reflecting the actual performance of the battery cell. By designing the elastic body, the pressure applied to the battery cell can be automatically adjusted according to the change of the internal pressure of the battery cell, simulating the expansion and contraction of the battery cell during actual use. The structure is simple, the installation and operation are convenient, the compatibility is good, and it is safe and reliable. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the present application, the drawings required for use in the embodiments will be briefly introduced below:

[0026] Figure 1 is a schematic structural diagram of a battery cell expansion force testing device provided by an embodiment of the present application;

[0027] Figure 2 is an exploded view of a battery cell expansion force testing device provided by an embodiment of the present application.

[0028] Reference Numerals:

[0029] 1 - First fixing plate, 2 - Second fixing plate, 3 - First pressing plate, 4 - Second pressing plate, 5 - Adjusting bolt, 6 - Elastic member, 7 - Pressure sensor, 8 - Temperature sensor, 9 - Support column, 10 - Mounting screw, 11 - Test battery cell. Detailed Embodiments

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Those skilled in the art can understand that, in this specification, the term "including" is an open-ended expression, meaning that the stated features exist but other features are not excluded. The orientation terms such as "upper", "lower", "left", and "right" are based on the exemplary directions shown in the drawings. Features defined with "first" and "second" implicitly include one or more of such features. The singular form can also be used for the plural form. The meaning of "a plurality" is two or more. The terms "mounted", "connected", and "coupled" can be a fixed connection, a detachable connection, or an integral connection; they can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components. In addition, "connection" can include wireless connection.

[0032] The purpose of this application is to overcome the above technical deficiencies and provide a cell expansion force testing device and a cell expansion force testing system, so as to solve the technical problem that the influence of pressure on the cell performance cannot be accurately analyzed in the prior art.

[0033] To achieve the above technical purpose, this application adopts the following technical solutions:

[0034] In a first aspect, this application provides a cell expansion force testing device, as Figure 1 and Figure 2 shown, Figure 1 is a schematic structural diagram of a cell expansion force testing device provided by an embodiment of this application; Figure 2 is an exploded view of a cell expansion force testing device provided by an embodiment of this application.

[0035] A cell expansion force testing device includes a first fixing plate 1, a second fixing plate 2, a first pressing plate 3, a second pressing plate 4, an adjusting bolt 5, an elastic member 6, a pressure sensor 7, and a temperature sensor 8:

[0036] The first fixing plate 1 and the second fixing plate 2, the first fixing plate 1 and the second fixing plate 2 are arranged oppositely;

[0037] The first pressing plate 3 and the second pressing plate 4, the first pressing plate 3 and the second pressing plate 4 are arranged oppositely and are both located between the first fixing plate 1 and the second fixing plate 2;

[0038] The adjusting bolt 5, the adjusting bolt 5 penetrates through the second fixing plate 2 and abuts against the second pressing plate 4;

[0039] The elastic member 6, the elastic member 6 abuts against the first pressing plate 3 and the second pressing plate 4 respectively;

[0040] The pressure sensor 7, the pressure sensor 7 is located between the first pressing plate 3 and the second pressing plate 4; and

[0041] The temperature sensor 8 is located between the first fixing plate 1 and the first pressing plate 3.

[0042] In the embodiment of the present application, by adjusting the bolt 5 to apply pressure to the second pressing plate 4 and the first pressing plate 3 and then transmitting it to the battery cell, precise pressure control of the battery cell can be achieved, and the pressure received by the battery cell can also be made uniform, which helps to improve the overall performance and safety of the battery pack. Also, by designing the temperature sensor 8 and the pressure sensor 7, the temperature and pressure data of the battery cell during the test can be uploaded in real time, intuitively reflecting the actual performance of the battery cell. By designing the elastomer, the pressure applied to the battery cell can be automatically adjusted according to the change of the internal pressure of the battery cell, simulating the expansion and contraction of the battery cell during actual use. The structure is simple, the installation and operation are convenient, the compatibility is good, and it is safe and reliable.

[0043] In some embodiments of the present application, a support column 9 is further included. The support column 9 penetrates through the first pressing plate 3 and the second pressing plate 4 and abuts against the first fixing plate 1 and the second fixing plate 2 respectively.

[0044] In some embodiments of the present application, a first sinking groove is provided on one side of the first fixing plate 1 facing the second fixing plate 2, a second sinking groove is provided on one side of the second fixing plate 2 facing the first fixing plate 1, and both ends of the support column 9 are respectively embedded in the first sinking groove and the second sinking groove.

[0045] In this embodiment, the support column 9 penetrates through the first pressing plate 3 and the second pressing plate 4 and abuts against the fixing plate, which can significantly improve the stability of the entire test device and reduce the measurement error caused by vibration during the test. Both ends of the support column 9 are respectively embedded in the first sinking groove and the second sinking groove, which helps to accurately position the pressing plate and the fixing plate and ensure the assembly accuracy of the test device.

[0046] In some embodiments of the present application, a plurality of mounting screws 10 are further included. The first fixing plate 1 has a first through hole, the second fixing plate 2 has a second through hole, and the mounting screw 10 is threadedly connected to the support column 9 through the first through hole on the first fixing plate 1 and is threadedly connected to the support column 9 through the second through hole on the second fixing plate 2.

[0047] In this embodiment, threaded holes are designed on both end faces of the support rod, and the mounting screw 10 can be used for locking. The use of the mounting screw 10 makes the assembly process more precise, can ensure the accurate alignment between the support column 9 and the fixing plate, and thus improves the assembly accuracy of the entire device.

[0048] In some embodiments of the present application, the second fixing plate 2 has a threaded hole, and the side wall of the adjusting bolt 5 is threadedly connected to the second fixing plate 2 through the threaded hole.

[0049] In this embodiment, the threaded connection allows the user to precisely adjust the pressure applied to the battery cell by rotating the adjusting bolt 5, thereby achieving fine pressure control. The threaded connection has good self-locking characteristics. Once adjusted to the appropriate pressure, the adjusting bolt 5 can maintain its position unchanged, ensuring stable pressure throughout the test process.

[0050] In some embodiments of the present application, the elastic member 6 includes a spring, and the spring is sleeved outside the support column 9.

[0051] In this embodiment, the spring can evenly transfer the pressure from the pressing plate to the battery cell, ensuring that the pressure received by the battery cell during the test is uniform and avoiding local overpressure. The elastic characteristics of the spring allow it to stretch and contract as the battery cell expands and contracts during charge and discharge, thereby maintaining a constant pressure on the battery cell.

[0052] In some embodiments of the present application, a third sinking groove is provided on the side of the first pressing plate 3 facing the second pressing plate 4, a fourth sinking groove is provided on the side of the second pressing plate 4 facing the first pressing plate 3, and both ends of the spring are respectively embedded in the third sinking groove and the fourth sinking groove.

[0053] In this embodiment, the design of the sinking groove can accurately position both ends of the spring, ensuring that the spring is correctly installed between the pressing plates without displacement. Both ends of the spring are embedded in the sinking groove, increasing the stability of the entire test device and reducing the vibration that may occur during the test process.

[0054] In some embodiments of the present application, a third through hole is provided on the side of the first pressing plate 3 facing the second pressing plate 4, a fourth through hole is provided on the side of the second pressing plate 4 facing the first pressing plate 3, and the support column 9 passes through the third through hole and the fourth through hole.

[0055] In some embodiments of the present application, a dug-out groove is provided on the side of the first pressing plate 3 facing the first fixing plate 1, or a dug-out groove is provided on the side of the first fixing plate 1 facing the first pressing plate 3. The inner contour of the dug-out groove matches the outer contour of the temperature sensor 8, and the temperature sensor 8 is embedded in the dug-out groove.

[0056] In this embodiment, the dug-out groove design ensures that the temperature sensor 8 is in close contact with the surface of the battery cell, so as to accurately monitor the temperature change of the battery cell during the test. After the temperature sensor 8 is embedded in the dug-out groove, it is flush with the surfaces of the first pressing plate 3 and the first fixing plate 1, avoiding applying additional pressure to the battery cell and interfering with the accuracy of the test results.

[0057] Second aspect, the present application also provides a cell expansion force test system, including a test cell 11 and a cell expansion force test device as described in any embodiment of the first aspect; wherein, the test cell 11 is located between the first fixing plate 1 and the first pressing plate 3 of the cell expansion force test device, and is in contact with the temperature sensor 8.

[0058] In this embodiment, when assembling the test device, first fix the support rod on the first fixing plate 1 with the mounting screw 10 positioned by the circular first counterbore on the first fixing plate 1, and then put on the first pressing plate 3 through the through hole of the support rod; a temperature sensor 8 is installed on the first pressing plate 3, and the surface of the sensor is flush with the surface of the first pressing plate 3 to ensure that the temperature sensor 8 will not affect the force on the cell during the test; a spring is sleeved on the support rod; the second pressing plate 4 is sleeved on the support rod and is flush with the upper end of the spring; a pressure sensor 7 is installed between the first pressing plate 3 and the second pressing plate 4; the circular second counterbore of the second fixing plate 2 is positioned with the support rod and locked with the mounting screw 10; then an adjusting screw is installed on the second fixing plate 2. When conducting the test, place the cell between the first fixing plate 1 and the first pressing plate 3; turn the adjusting bolt 5 to apply a certain pressure to the second pressing plate 4, which is transmitted to the first pressing plate 3 through the spring, and then the test cell 11 is pressed through the first pressing plate 3; the temperature sensor 8 and the pressure sensor 7 can upload the temperature and pressure data in real time, and the spring is an elastic body. When the internal pressure of the test cell 11 changes, it will apply pressure to the first pressing plate 3, and the pressure sensor 7 will then feedback the current pressure value in real time.

[0059] This test device is simple to install and operate, and can monitor the pressure and temperature changes of the cell during the test in real time; at the same time, different initial pressures can be set to study the cell test, providing key information for the subsequent formation of the cell into a battery pack.

[0060] Compared with the prior art, the beneficial technical effects brought by the technical solution provided by the present application include:

[0061] In the embodiment of the present application, by adjusting the bolt 5 to apply pressure to the second pressing plate 4 and the first pressing plate 3, and then transmitting it to the cell, precise pressure control of the cell can be achieved, and the pressure received by the cell can also be made uniform, which helps to improve the overall performance and safety of the battery pack. Also, by designing the temperature sensor 8 and the pressure sensor 7, the temperature and pressure data of the cell during the test can be uploaded in real time, intuitively reflecting the actual performance of the cell. By designing the elastic body, the pressure applied to the cell can be automatically adjusted according to the change of the internal pressure of the cell, simulating the expansion and contraction of the cell during actual use. The structure is simple, the installation and operation are convenient, the compatibility is good, and it is safe and reliable.

[0062] Those skilled in the art can understand that the various operations, methods, steps, measures, and solutions in the processes discussed in this application can be alternated, changed, rearranged, decomposed, combined, or deleted.

[0063] The specific implementation manners of the present application described above do not limit the protection scope of the present application. Any other corresponding changes and deformations made according to the technical concept of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A testing device for the swelling force of an electric cell, characterized in that Comprising: A first fixing plate and a second fixing plate, the first fixing plate and the second fixing plate being oppositely arranged; A first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate being oppositely arranged and both located between the first fixing plate and the second fixing plate; An adjusting bolt, the adjusting bolt passing through the second fixing plate and abutting against the second pressing plate; An elastic member, the elastic member abutting against the first pressing plate and the second pressing plate respectively; A pressure sensor, the pressure sensor being located between the first pressing plate and the second pressing plate; And A temperature sensor, the temperature sensor being located between the first fixing plate and the first pressing plate.

2. The cell swelling force testing device according to claim 1, wherein, Further comprising support columns, the support columns passing through the first pressing plate and the second pressing plate and respectively abutting against the first fixing plate and the second fixing plate.

3. The cell expansion force testing device according to claim 2, wherein On one side of the first fixing plate facing the second fixing plate, a first sunk groove is provided, on one side of the second fixing plate facing the first fixing plate, a second sunk groove is provided, and two ends of the support column are respectively embedded in the first sunk groove and the second sunk groove.

4. The cell expansion force testing device according to claim 2, wherein, Further comprising a plurality of mounting screws, the first fixing plate having a first through hole, the second fixing plate having a second through hole, the mounting screws being threadedly connected to the support column through the first through hole on the first fixing plate and being threadedly connected to the support column through the second through hole on the second fixing plate.

5. The cell expansion force testing device according to claim 1, wherein, The second fixing plate has a threaded hole, and the side wall of the adjusting bolt is threadedly connected to the second fixing plate through the threaded hole.

6. The cell expansion force testing device according to claim 1, wherein, The elastic member includes a spring, and the spring is sleeved outside the support column.

7. The cell expansion force testing device according to claim 6, characterized in that, On one side of the first pressing plate facing the second pressing plate, a third sunk groove is provided, on one side of the second pressing plate facing the first pressing plate, a fourth sunk groove is provided, and two ends of the spring are respectively embedded in the third sunk groove and the fourth sunk groove.

8. The cell expansion force testing device according to claim 7, wherein, On one side of the first pressing plate facing the second pressing plate, a third through hole is provided, on one side of the second pressing plate facing the first pressing plate, a fourth through hole is provided, and the support column passes through the third through hole and the fourth through hole.

9. The cell expansion force testing device according to claim 1, wherein, On one side of the first pressing plate facing the first fixing plate, a dug-out groove is provided, or on one side of the first fixing plate facing the first pressing plate, a dug-out groove is provided, the inner contour of the dug-out groove matching the outer contour of the temperature sensor, and the temperature sensor being embedded in the dug-out groove.

10. A battery cell expansion force test system, characterized in that, Comprising a test battery cell and a battery cell expansion force testing device according to any one of claims 1-9; wherein, the test battery cell is located between the first fixing plate and the first pressing plate of the battery cell expansion force testing device and is in contact with the temperature sensor.

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