CN221123658U - Expansion force testing tool - Google Patents

Abstract

The utility model relates to the technical field of battery cell testing, and discloses an expansion force testing tool. The expansion force testing tool comprises a base, a pressing assembly, a pressure sensor and a force application shell, wherein the pressing assembly can move along a preset direction, a placement position for accommodating a battery cell to be tested is formed between the pressing assembly and the base, the pressure sensor is arranged on the pressing assembly and used for detecting the expansion force of the battery cell to be tested, the force application shell is accommodated in the placement position, the large surface of the force application shell is abutted to the large surface of the battery cell to be tested, an injection port is formed in the force application shell and used for injecting gas or liquid into the force application shell. The pretightening force of the force application shell on the battery cell to be tested can be accurately controlled by adjusting the amount of gas or liquid filled into the force application shell, so that the actual stress state of the battery cell to be tested in the battery module is simulated, and accurate test data are measured.

Description

Expansion force testing tool

Technical Field

The utility model relates to the technical field of battery cell testing, in particular to an expansion force testing tool.

Background

In recent years, with the rapid development of new energy industry, batteries are increasingly used as energy supply components in various devices, and accordingly, higher requirements are also put on the performance of the battery cells. Therefore, the expansion force of the battery cell is one of the very important factors for representing the performance of the battery cell, and the expansion force of the battery cell is generally tested by a special tool.

In the prior art, the battery cell expansion force testing tool is generally in a mode of combining a clamping plate and a pressure sensor, the battery cell is clamped by the two clamping plates to provide clamping pretightening force for the battery cell, and the expansion deformation of the battery cell can increase the stress of the pressure sensor, so that the expansion condition of the battery cell during charge and discharge circulation is tested. When the pretightening force needs to be changed, different pretightening forces are applied to the battery cells in a mode of driving the movable clamping plate to move by screwing the screw rod which is abutted to the movable clamping plate. However, the method of adjusting the force application by screwing the screw has limitation on the adjustment of the pretightening force, and through practical tests, the method can only adjust the pretightening force to 12000N to the maximum extent, and cannot be achieved after exceeding 12000N, so that the method cannot simulate the practical stress condition of the battery cell in the battery module, and cannot explore the influence of the initial pretightening force on the expansion force of the battery cell in a larger range.

Therefore, it is desirable to provide an expansion force testing tool to solve the above-mentioned problems.

Disclosure of utility model

The utility model aims to provide an expansion force testing tool which can simulate the actual stress state of a battery cell in a battery module and explore the influence of initial pretightening force on the expansion force of the battery cell in a larger range, so that more complete test data can be obtained.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

Expansion force test fixture includes:

The pressing assembly can move along a preset direction, and a placement position for accommodating a battery cell to be tested is formed between the pressing assembly and the base;

The pressure sensor is used for detecting the expansion force of the battery cell to be detected; and

The application of force casing holds in place the position, just the big face of application of force casing with the big face butt of test electric core, be equipped with the filling port on the application of force casing, the filling port is used for injecting gas or liquid in the application of force casing.

As an alternative, the base includes a first end plate, a second end plate, and a guide rod, where the first end plate and the second end plate are disposed opposite to each other, the guide rod is connected between the first end plate and the second end plate, the pressing assembly is disposed between the first end plate and the second end plate, and the placement position is formed between the first end plate and the pressing assembly.

As an alternative, the number of the guide rods is set to be plural, and a plurality of the guide rods are connected between edges of the first end plate and the second end plate.

As an alternative, the guide rod is detachably connected to the first end plate and the second end plate by a fastener.

As an alternative scheme, the pressure applying component comprises a first pressing plate and a second pressing plate, the first pressing plate is located between the second pressing plate and the first end plate, the first pressing plate and the first end plate form the placing position, the pressure sensor is connected with the second pressing plate and is abutted to the first pressing plate, and the second pressing plate is used for pushing the first pressing plate to move.

As an alternative, the first pressing plate and/or the second pressing plate are/is sleeved on the guide rod in a sliding way.

As an alternative scheme, a first sliding piece is arranged on the first pressing plate, and the first pressing plate is sleeved on the guide rod in a sliding way through the first sliding piece; and/or

The second pressing plate is provided with a second sliding part, and the second pressing plate is sleeved on the guide rod in a sliding way through the second sliding part.

As an alternative, the expansion force testing tool further includes an adjusting component, where the adjusting component includes:

the screw rod sleeve is fixed at one end of the base far away from the placement position;

the screw rod is arranged in the screw rod sleeve in a penetrating mode and is in threaded connection with the screw rod sleeve, one end of the screw rod is abutted to one side, far away from the placement position, of the pressing assembly, and the pressing assembly can be driven to move along the preset direction by screwing the screw rod.

As an alternative scheme, one end of the screw rod, which is far away from the pressing assembly, is provided with a screwing part, and the cross section shape of the screwing part is polygonal.

As an alternative scheme, one end of the screw rod, which is close to the pressing component, is provided with an abutting boss, and the screw rod is abutted to the pressing component through the abutting boss.

As an alternative, the force application housing is made of a material having toughness and elasticity.

The beneficial effects of the utility model are as follows:

When the expansion force testing tool provided by the utility model is used, firstly, the cell to be tested and the force application shell are jointly placed at the placement position between the pressure application assembly and the base, the large surface of the force application shell is abutted against the large surface of the cell to be tested, then, the pressure application assembly is moved along the preset direction, so that the pressure application assembly and the base jointly clamp the cell to be tested and the force application shell, then, a certain amount of gas or liquid is injected into the force application shell through the injection port until the force applied by the force application shell to the cell to be tested is equal to the first preset pretightening force, the injection port is stopped and sealed, then, the cell to be tested is charged and discharged, the expansion force of the cell can be transmitted to the pressure sensor through the pressure application assembly, and the pressure sensor detects the expansion force of the cell in real time. When the pretightening force needs to be changed, gas or liquid is continuously injected into the force application shell through the injection opening until the force applied by the force application shell to the battery cell to be tested is equal to the second pretightening force, and then the expansion force test is carried out on the battery cell to be tested, so that the battery cell to be tested is pushed. The pre-tightening force applied to the battery cell to be tested by the force application shell can be accurately controlled by adjusting the amount of gas or liquid filled into the force application shell, so that the actual stress state of the battery cell to be tested in the battery module is simulated, the influence of the initial pre-tightening force on the expansion force in a larger range is explored, more accurate test data can be obtained, and the method has important guiding significance on the design of the battery module.

Drawings

For a more obvious and understandable description of embodiments of the utility model or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the utility model, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of an expansion force testing tool according to an embodiment of the present utility model at a first view angle;

FIG. 2 is an exploded view of an expansion force testing tool provided by an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of an expansion force testing tool according to an embodiment of the present utility model at a second view angle.

In the figure:

10. A base; 11. a first end plate; 111. a first mounting hole; 12. a second end plate; 13. a guide rod; 131. a second mounting hole; 14. a fastener; 15. a placement bit;

20. a pressing assembly; 21. a first platen; 22. a second pressing plate;

30. A pressure sensor; 40. a force application housing; 41. an injection port; 50. a cell to be tested;

60. An adjustment assembly; 61. a screw rod sleeve; 62. a screw rod; 621. a screwing part; 622. and abutting against the boss.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides an expansion force testing tool for measuring the expansion force of a single to-be-tested battery cell 50 in the charge-discharge cycle process, so as to know the expansion force change rule of the whole life cycle of the to-be-tested battery cell 50. The battery cell 50 to be tested is a square shell battery cell, and two surfaces with the largest area are large surfaces of the battery cell 50 to be tested.

Specifically, as shown in fig. 1 and 2, the expansion force testing tool includes a base 10, a pressing assembly 20, a pressure sensor 30 and a force application housing 40, wherein the pressing assembly 20 can move along a preset direction, and a placement position 15 for accommodating a cell 50 to be tested is formed between the pressing assembly 20 and the base 10; the pressure sensor 30 is disposed on the pressure applying assembly 20, the pressure sensor 30 is communicatively connected with the control device, so as to detect the expansion force of the to-be-measured cell 50, the force applying housing 40 is accommodated in the placement position 15, the large surface of the force applying housing 40 is abutted to the large surface of the to-be-measured cell 50, the force applying housing 40 is provided with an injection port 41, and the injection port 41 is used for injecting gas or liquid into the force applying housing 40. In this embodiment, the force application housing 40 is a housing of a square battery cell, and in other embodiments, the force application housing 40 may be any other housing capable of achieving the desired function, which is not limited herein. For ease of understanding, a preset direction is defined as the X-axis direction. It should be noted that, the pressure sensor 30 and the corresponding control device belong to the prior art, and any one of the pressure sensor 30, the control device and the corresponding electrical connection circuit capable of realizing the above functions in the prior art is adopted in the present application, which is not described herein.

When in use, the cell 50 to be tested and the force application housing 40 are firstly placed at the placement position 15 between the pressure application assembly 20 and the base 10, the large surface of the force application housing 40 is abutted against the large surface of the cell 50 to be tested, then the pressure application assembly 20 is moved along the preset direction, the pressure application assembly 20 and the base 10 clamp the cell 50 to be tested and the force application housing 40 together, then a certain amount of gas or liquid (such as water) is injected into the force application housing 40 through the injection opening 41 until the force applied by the force application housing 40 to the cell 50 to be tested is equal to the first preset pretightening force, the injection opening 41 is stopped and sealed, then the cell 50 to be tested is subjected to a charge-discharge cycle process, the expansion force of the cell 50 to be tested can be transmitted to the pressure sensor 30 through the pressure application assembly 20, and the pressure sensor 30 detects the expansion force and the change condition of the cell 50 to be tested in real time. When the pretightening force needs to be changed, gas or liquid is continuously injected into the force application shell 40 through the injection opening 41 until the force applied by the force application shell 40 to the to-be-tested battery cell 50 is equal to the second preset pretightening force, the injection is stopped, the injection opening 41 is sealed, then the to-be-tested battery cell 50 is subjected to a charge-discharge circulation process, the pressure sensor 30 detects the expansion force of the to-be-tested battery cell 50 in real time, and the test process of the rest pretightening force is similar. When gas or liquid is injected into the force application housing 40, the force applied by the force application housing 40 to the battery cell 50 to be tested can be directly measured by the pressure sensor 30, and after the pressure value measured by the pressure sensor 30 is equal to the preset pretightening force, the injection is stopped, and then the pressure sensor 30 can be reset to zero before the expansion force test is performed.

In summary, by adjusting the amount of the gas or the liquid filled into the force application housing 40, the force application housing 40 can precisely control the pretightening force applied to the battery cell 50 to be tested, and the pretightening force applied to the battery cell 50 to be tested by this method can be adjusted within the range of 0-50000N, so as to simulate the actual stress state of the battery cell 50 to be tested in the battery module, explore the influence of the initial pretightening force on the expansion force in a larger range, further obtain more accurate test data, and have important guiding significance on the design of the battery module. Secondly, through practical use tests, in the prior art, the pre-tightening force of the pressing assembly 20 to the battery cell 50 to be tested is adjusted by screwing the screw rod abutting against the pressing assembly 20, after the screw rod is loosened, the pre-tightening force can be obviously reduced, the fluctuation is large, for example, the pre-tightening force is adjusted to 100N by screwing the screw rod, but after the screw rod is loosened, the pre-tightening force can only reach 80N, in the embodiment, the pre-tightening force of the battery cell 50 to be tested is adjusted by filling gas or liquid into the force application shell 40, after the injection is stopped, the pre-tightening force is reduced by about a few newtons, the fluctuation is small, and the test result is more accurate.

Alternatively, force-applying housing 40 is made of a material that is both flexible and resilient. The flexible material enables the force application housing 40 to deform greatly and not to fail easily, and the force application housing 40 can deform in different degrees along with different amounts of gas or liquid, so that different initial pretightening forces are applied to the battery cell 50 to be tested, and the range of the initial pretightening force provided by the force application housing 40 to the battery cell 50 to be tested is ensured. The material also has elasticity, so that the force application shell 40 can automatically recover to the original state after pressure release, thereby ensuring the service life of the force application shell 40. Illustratively, the force housing 40 may be made of aluminum, stainless steel, titanium alloy, magnesium alloy, aluminum alloy, or slightly harder rubber. As shown in fig. 1 and 2, the base 10 includes a first end plate 11, a second end plate 12, and a guide bar 13, the first end plate 11 and the second end plate 12 are disposed opposite to each other, and the first end plate 11 and the second end plate 12 are square plates, the guide bar 13 is connected between the first end plate 11 and the second end plate 12, the pressing assembly 20 is disposed between the first end plate 11 and the second end plate 12, and a placement position 15 is formed between the first end plate 11 and the pressing assembly 20. By the arrangement, the whole structure of the base 10 is simple and stable, and the manufacturing cost is low.

Alternatively, the number of the guide rods 13 is set to be plural, and a plurality of guide rods 13 are connected between the edges of the first and second end plates 11 and 12, thereby securing structural stability of the base 10. In this embodiment, the number of the guide rods 13 is four, one ends of the four guide rods 13 are respectively connected to four corner positions of the first end plate 11, and the other ends are respectively connected to four corner positions of the second end plate 12, so as to realize a stable connection between the first end plate 11 and the second end plate 12. The guide rod 13 has reasonable space distribution, can reserve a middle space for bearing the arrangement of the battery cell 50 to be tested, the force application shell 40 and other components, and has a compact overall structure. In other embodiments, the number of the guide rods 13 may be flexibly set according to actual requirements, which is not specifically limited herein.

Preferably, the guide bar 13 is detachably connected to the first end plate 11 and the second end plate 12 by fasteners 14. By adopting detachable connection, the guide rod 13 is easy to detach, and later maintenance and replacement of parts are facilitated. Wherein the fasteners 14 are bolts. Specifically, as shown in fig. 2, four corners of the first end plate 11 and the second end plate 12 are respectively provided with a first mounting hole 111, the first mounting hole 111 is a stepped hole, the stepped hole is a smooth hole or a portion with a smaller stepped hole diameter is a threaded hole, two ends of the guide rod 13 are respectively provided with a second mounting hole 131, the second mounting holes 131 are threaded holes, and the fastener 14 sequentially penetrates through the first mounting hole 111 and the second mounting hole 131 and is abutted to a stepped surface of the first mounting hole 111 so as to connect the first end plate 11 to one end of the guide rod 13, and the second end plate 12 is connected to the other end of the guide rod 13.

Further, referring to fig. 1 and 2, the pressing assembly 20 includes a first pressing plate 21 and a second pressing plate 22, the first pressing plate 21 is located between the second pressing plate 22 and the first end plate 11, the first pressing plate 21 and the second pressing plate 22 are square plates, a placement position 15 is formed between the first pressing plate 21 and the first end plate 11, the pressure sensor 30 is connected to the second pressing plate 22 and abuts against the first pressing plate 21, and the second pressing plate 22 is used for pushing the first pressing plate 21 to move. By pushing the second pressing plate 22 to move along the preset direction, the first pressing plate 21 can be driven to move along the preset direction towards the direction close to the first end plate 11, so that the first end plate 11 and the first pressing plate 21 can clamp the to-be-tested battery cell 50 and the force application housing 40. The pressure sensor 30 can be in direct contact with the first pressing plate 21, the to-be-measured cell 50 can apply an acting force to the force application shell 40 after being expanded, the force application shell 40 applies an acting force to the first pressing plate 21 and pushes the first pressing plate 21 to generate displacement, and the first pressing plate 21 is propped against the pressure sensor 30, so that the pressure sensor 30 can measure the pressure and the change of the to-be-measured cell 50 acting on the first pressing plate 21 after being expanded, and the expansion force and the change condition of the to-be-measured cell 50 can be obtained.

Preferably, as shown in fig. 1, the first end plate 11, the first pressing plate 21, the second pressing plate 22 and the second end plate 12 are arranged in parallel, so that the stress of the to-be-tested battery cell 50 located at the placement position 15 is uniform, the accuracy of performance test of the to-be-tested battery cell 50 is improved, and local extrusion of the to-be-tested battery cell 50 caused by excessive local stress can be avoided.

As shown in fig. 1, the first pressing plate 21 and the second pressing plate 22 are both slidably sleeved on the guide rod 13. By the arrangement, the sliding of the first pressing plate 21 and the second pressing plate 22 can be guided, so that the first pressing plate 21 and the second pressing plate 22 can only slide along the extending direction (preset direction) of the guide rod 13, and the operation is convenient.

Specifically, a first sliding member (not shown) is disposed on the first pressing plate 21, the first pressing plate 21 is slidably sleeved on the guide rod 13 through the first sliding member, a second sliding member (not shown) is disposed on the second pressing plate 22, and the second pressing plate 22 is slidably sleeved on the guide rod 13 through the second sliding member. The first sliding piece and the second sliding piece are both guide sleeves or linear bearings. With the adoption of the arrangement, friction can be reduced, so that the first pressing plate 21 and the second pressing plate 22 slide more smoothly and stably relative to the guide rod 13, the accuracy of measurement of the pressure sensor 30 is improved, and the service life of the expansion force testing tool is prolonged.

Further, as shown in fig. 2, the expansion force testing tool further includes an adjusting component 60, the adjusting component 60 includes a screw sleeve 61 and a screw rod 62, the screw rod sleeve 61 is fixed on the second end plate 12, the screw rod 62 is threaded through the screw rod sleeve 61 and is connected with the screw rod sleeve 61 in a threaded manner, one end of the screw rod 62 abuts against the second pressing plate 22, and screwing of the screw rod 62 can drive the pressing component 20 to move along a preset direction. An operator can drive the second pressing plate 22 to move along a preset direction by rotating the screw rod 62, and the second pressing plate 22 pushes the first pressing plate 21 to move along the preset direction by the pressure sensor 30, so that the distance between the first pressing plate 21 and the first end plate 11 is adjusted, and the pressure applied by the first pressing plate 21 to the force application shell 40 is further adjusted. The adjusting assembly 60 is simple in structure and convenient and quick to operate.

It should be noted that, when the first pressing plate 21 and the first end plate 11 jointly clamp the to-be-tested cell 50 and the force application housing 40, and when no gas or liquid is injected into the force application housing 40, the force application housing 40 applies a pretightening force to the to-be-tested cell 50 equal to the pressure applied by the first pressing plate 21 to the force application housing 40, and since the pretightening force of the force application housing 40 to the to-be-tested cell 50 is adjusted by injecting different amounts of gas or liquid into the force application housing 40 in the present embodiment, the pressure value is not limited when the pressure of the first pressing plate 21 to the force application housing 40 is adjusted by screwing the screw 62. For example, in the first case, when the screw rod 62 is screwed, the screw rod 62 may be screwed to the tightest, so that the pressure of the first pressing plate 21 on the force application housing 40 reaches the upper limit value regulated by the screw rod 62, at this time, the pre-tightening force applied by the force application housing 40 to the battery cell 50 to be tested is equal to the upper limit value, and the difference between the pre-tightening force and the pre-tightening force is compensated by charging gas or liquid into the force application housing 40, and in this process, the magnitude and the difference of the pre-tightening force are monitored in real time by the pressure sensor 30. In the second case, the screw 62 may be screwed to a state where the first pressing plate 21 does not exert pressure on the urging housing 40, and the pretensioning force is achieved by filling the urging housing 40 with gas or liquid. The two cases are two extreme cases, and in the other cases, the screw rod 62 may be screwed to any pressure value between zero and the upper limit value of the pressure of the first pressing plate 21 on the force application housing 40, and the difference between the actual pre-tightening force and the preset pre-tightening force is compensated by filling gas or liquid into the force application housing 40, which is not described herein.

Preferably, as shown in fig. 3, one end of the screw rod 62 far away from the second pressing plate 22 is provided with a screwing part 621, and the cross section of the screwing part 621 is polygonal, so that an operator can screw the screwing part 621 to rotate the screw rod 62 through a tool such as a wrench, the difficulty of rotation of the screw rod 62 is reduced, and the operation is more convenient. Specifically, the cross-sectional shape of the screwing portion 621 may be a quadrangle, a pentagon, a hexagon, or other polygons, and may be flexibly set according to actual needs, which is not particularly limited herein.

As shown in fig. 2, an abutment boss 622 is provided at an end of the screw 62 near the second platen 22, and the screw 62 abuts against the second platen 22 through the abutment boss 622. The contact boss 622 can increase the contact area between the screw rod 62 and the second pressing plate 22, reduce the pressure at the contact position between the screw rod 62 and the second pressing plate 22, and prevent the second pressing plate 22 from being damaged by the screw rod 62 after long-term use.

The working process of the expansion force testing tool is described in detail with reference to fig. 1 and 2:

Firstly, the to-be-measured cell 50 and the force application housing 40 are put into the placement position 15 between the first end plate 11 and the first pressing plate 21, the large surface of the force application housing 40 is abutted against the large surface of the to-be-measured cell 50, the screw rod 62 is rotated, the second pressing plate 22 and the first pressing plate 21 are driven to move along the preset direction, and the first end plate 11 and the first pressing plate 21 jointly clamp the to-be-measured cell 50 and the force application housing 40. After that, a certain amount of gas or liquid is injected into the force application housing 40 through the injection opening 41 until the force applied by the force application housing 40 to the cell 50 to be tested is equal to the preset pretightening force, the injection is stopped and the injection opening 41 is sealed, then the cell 50 to be tested is subjected to a charging and discharging process, after the cell 50 to be tested is expanded, the force is applied to the first pressing plate 21 through the force application housing 40, the first pressing plate 21 is pushed to generate displacement, and the first pressing plate 21 is pressed against the pressure sensor 30, so that the pressure sensor 30 can measure the pressure and the change of the first pressing plate 21 acted on the cell 50 to be tested after the cell 50 to be tested is expanded, and the expansion force and the change condition of the cell 50 to be tested can be obtained. The pretightening force of the force application housing 40 to the cell 50 to be tested is changed by controlling the amount of gas or liquid injected into the force application housing 40, and the corresponding expansion force test is completed, which is not described herein.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (11)

1. Expansion force test fixture, its characterized in that includes:

The device comprises a base (10) and a pressing assembly (20), wherein the pressing assembly (20) can move along a preset direction, and a placement position (15) for accommodating a cell (50) to be tested is formed between the pressing assembly (20) and the base (10);

a pressure sensor (30) for detecting an expansion force of the cell (50) to be measured; and

The force application shell (40) is accommodated in the placement position (15), the large surface of the force application shell (40) is in contact with the large surface of the battery cell (50) to be tested, an injection opening (41) is formed in the force application shell (40), and the injection opening (41) is used for injecting gas or liquid into the force application shell (40).

2. The expansion force testing tool according to claim 1, wherein the base (10) comprises a first end plate (11), a second end plate (12) and a guide rod (13), the first end plate (11) and the second end plate (12) are oppositely arranged, the guide rod (13) is connected between the first end plate (11) and the second end plate (12), the pressing assembly (20) is located between the first end plate (11) and the second end plate (12), and the placement position (15) is formed between the first end plate (11) and the pressing assembly (20).

3. Expansion force testing fixture according to claim 2, characterized in that the number of guide rods (13) is plural, a plurality of guide rods (13) being connected between the edges of the first end plate (11) and the second end plate (12).

4. Expansion force testing fixture according to claim 2, characterized in that the guide rod (13) is detachably connected to the first end plate (11) and the second end plate (12) by means of fasteners (14).

5. The expansion force testing tool according to claim 2, wherein the pressing assembly (20) comprises a first pressing plate (21) and a second pressing plate (22), the first pressing plate (21) is located between the second pressing plate (22) and the first end plate (11), the placement position (15) is formed between the first pressing plate (21) and the first end plate (11), the pressure sensor (30) is connected to the second pressing plate (22) and abuts against the first pressing plate (21), and the second pressing plate (22) is used for pushing the first pressing plate (21) to move.

6. Expansion force testing tool according to claim 5, characterized in that the first pressure plate (21) and/or the second pressure plate (22) are/is slidably sleeved on the guide rod (13).

7. The expansion force testing tool according to claim 6, wherein a first sliding piece is arranged on the first pressing plate (21), and the first pressing plate (21) is sleeved on the guide rod (13) in a sliding way through the first sliding piece; and/or

The second pressing plate (22) is provided with a second sliding part, and the second pressing plate (22) is sleeved on the guide rod (13) in a sliding way through the second sliding part.

8. The expansion force testing tool according to any one of claims 1-7, further comprising an adjustment assembly (60), the adjustment assembly (60) comprising:

A screw rod sleeve (61), wherein the screw rod sleeve (61) is fixed at one end of the base (10) far away from the placement position (15);

The screw rod (62), screw rod (62) wear to locate screw rod cover (61) and with screw rod cover (61) threaded connection, one end butt of screw rod (62) in one side that is kept away from of pressure applying component (20) place position (15), screw rod (62) can drive pressure applying component (20) are followed preset direction removes.

9. The expansion force testing tool according to claim 8, wherein a screwing portion (621) is provided at an end of the screw rod (62) away from the pressing assembly (20), and a cross-sectional shape of the screwing portion (621) is polygonal.

10. The expansion force testing tool according to claim 8, wherein an end of the screw rod (62) close to the pressing assembly (20) is provided with an abutting boss (622), and the screw rod (62) abuts against the pressing assembly (20) through the abutting boss (622).

11. The expansion force testing fixture according to any one of claims 1 to 7, wherein the force application housing (40) is made of a material having toughness and elasticity.