A test fixture

Abstract

The application discloses a test fixture, comprising a base, a clamp and a pressure sensor, the clamp is used for clamping a battery and is in sliding connection with the base, and the sliding direction is parallel to the clamping direction of the battery; the pressure sensor is connected with the base and protrudes from the base towards the clamp, and the clamp is in contact with the pressure sensor along the sliding direction. Compared with the prior art, the application keeps the sliding direction of the clamp parallel to the clamping direction of the battery, fixes the pressure sensor on the base and protrudes the pressure sensor towards the clamp, so that the force generated by the battery expansion is directly transmitted to the pressure sensor, and the measurement accuracy is improved; meanwhile, due to the fixed connection between the pressure sensor and the base, when different sizes of batteries are replaced or the battery is measured at multiple points, multiple pressure sensors can be arranged on the base without increasing additional supports and external connecting members.

Description

Technical Field

[0001] This application relates to the field of fixture technology, and in particular to a test fixture. Background Technology

[0002] As the energy density of electrochemical energy storage devices such as lithium-ion batteries and solid-state batteries continues to increase, the volume expansion of battery cells during charge-discharge cycles, gas evolution, temperature rise, or aging is receiving increasing attention. In order to evaluate the mechanical behavior of batteries under different operating conditions and to predict safety and lifespan, the industry generally uses clamping force / pressure sensors to quantitatively measure battery expansion force.

[0003] Existing measuring devices typically mount sensors as independent components on fixtures or support frames. When it is necessary to measure larger batteries or multiple locations simultaneously, the number of sensors and their mounting components must be multiplied, resulting in an increase in overall volume and weight, which is not conducive to bench integration and movement. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this application provides a test fixture that can achieve high-density, multi-point, and stable expansion force measurement without significantly increasing the size and weight of the device.

[0005] To achieve the above objectives, this application adopts the following technical solution: A test fixture includes a base, a clamp, and a pressure sensor. The clamp is used to hold a battery and is slidably connected to the base, with the sliding direction parallel to the holding direction of the battery. The pressure sensor is connected to the base and protrudes from the base in a direction close to the clamp, and the clamp contacts the pressure sensor along the sliding direction.

[0006] In one embodiment, the base protrudes to one side of the clamp to form a guide post, the guide post extends along the sliding direction, and the clamp is slidably connected to the guide post.

[0007] In one embodiment, the clamp includes a first clamping plate and a second clamping plate, which are arranged opposite to each other to form a clamping space for clamping the battery. The first clamping plate is pressed against the pressure sensor and slidably connected to the guide post. The second clamping plate can be selectively close to or away from the first clamping plate.

[0008] In one embodiment, the fixture includes a plurality of measuring elements for assisting in leveling the second clamping plate. The plurality of measuring elements are connected to the first clamping plate or the second clamping plate, and the plurality of measuring elements are used to measure the parallelism at different positions of the first clamping plate and the second clamping plate.

[0009] In one embodiment, the clamp includes a locking member that passes through the second clamping plate and is connected to the guide post to restrict the movement of the second clamping plate.

[0010] In one embodiment, the locking member is connected to the second clamping plate and movably connected to the guide post to adjust the distance between the first clamping plate and the second clamping plate.

[0011] In one embodiment, a plurality of measuring elements are arranged sequentially at intervals along the length of the fixture.

[0012] In one embodiment, the plurality of measuring elements are divided into two groups, and the two groups of measuring elements are symmetrically arranged on opposite sides of the clamp along the width direction of the clamp.

[0013] In one embodiment, the clamp includes a fixing member for securing the measuring element to the first clamp or the second clamp.

[0014] In one embodiment, the fixing member has a clamping hole and a clamping groove. The measuring member passes through the clamping hole, and the clamping groove communicates with the clamping hole. The clamping groove extends through the fixing member in the radial direction of the clamping hole. The width of the clamping groove can be selectively reduced or increased to clamp or release the measuring member through the clamping hole.

[0015] The beneficial effects of this application are as follows: This application provides a test fixture, including a base, a clamp, and a pressure sensor. The clamp is used to hold a battery and is slidably connected to the base, with the sliding direction parallel to the battery's clamping direction. The pressure sensor is connected to the base and protrudes from the base towards the clamp, and the clamp contacts the pressure sensor along the sliding direction. Compared with the prior art, this application improves the measurement accuracy by keeping the sliding direction of the clamp parallel to the battery clamping direction and fixing the pressure sensor to the base and protruding towards the clamp, allowing the force generated by the battery expansion to be directly transmitted to the pressure sensor. Simultaneously, due to the fixed connection between the sensor and the base, multiple pressure sensors can be arranged on the base without adding additional supports and external connectors when replacing batteries of different sizes or performing multi-point measurements on the battery. This achieves multi-point measurement without significantly increasing the size and weight of the device, solving the technical problems of large size and inaccurate measurement in existing measuring fixtures. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a test fixture according to this application is shown; Figure 2 A cross-sectional schematic diagram of a test fixture according to this application is shown; Figure 3A front view schematic diagram of a test fixture according to this application is shown; Figure 4 It shows Figure 3 Enlarged view of point A in the image; Figure 5 An exploded view of a test fixture according to this application is shown; Figure 6 Another structural schematic diagram of a test fixture according to this application is shown; Figure 7 A structural schematic diagram of a fastener according to this application is shown; Attached label: 1, base; 2. Fixture; 21. First clamping plate; 22. Second clamping plate; 23. Measuring piece; 24. Locking piece; 25. Fixing piece; 251. Clamping groove; 252. Clamping hole; 26. Abutment block; 3. Pressure sensor; 4. Guide post; 10. Battery. Detailed Implementation

[0017] In this application, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0018] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] See Figure 1 and Figure 2This application provides a test fixture 2, including a base 1, a fixture 2 and a pressure sensor 3. The fixture 2 is used to hold a battery 10 and is slidably connected to the base 1, and the sliding direction is parallel to the holding direction of the battery 10. The pressure sensor 3 is connected to the base 1 and protrudes from the base 1 in a direction close to the fixture 2. The fixture 2 contacts the pressure sensor 3 along the sliding direction.

[0021] In practical applications, the base 1 is an integral load-bearing component with its own guide component to achieve linear sliding of the clamp 2 relative to the base 1. The clamp 2 is used to hold the battery 10, and the sliding direction of the clamp 2 is parallel to the clamping direction of the battery 10, thereby ensuring that the force transmission path is consistent with the main expansion direction of the battery 10. As a clamping component for holding the battery 10, the clamp 2 is slidably connected to the base 1 through the guide component, and a pressure plate is provided on the other side to contact the battery 10. The pressure sensor 3 is fixed to the mounting position of the base 1 and protrudes from the mounting plane of the base 1 in the direction close to the clamp 2, so that the force-bearing surface of the pressure sensor 3 is within the reachable stroke range of the clamp 2. During assembly, the clamp 2 moves in the sliding direction towards the pressure sensor 3 until it contacts the pressure sensor 3. When the battery 10 is clamped, as the battery 10 expands under charging and discharging conditions, the expansion force pushes the clamp 2 to press against the pressure sensor 3 in the sliding direction, transmitting the expansion force of the battery 10 to the pressure sensor 3. The pressure sensor 3 thus obtains a measurement signal corresponding to the expansion force of the battery 10.

[0022] Compared to existing technologies, this application improves measurement accuracy by keeping the sliding direction of the clamp 2 parallel to the clamping direction of the battery 10 and fixing the pressure sensor 3 to the base 1 and making it protrude towards the clamp 2. This allows the force generated by the expansion of the battery 10 to be directly transmitted to the pressure sensor 3. At the same time, due to the fixed connection between the pressure sensor 3 and the base 1, multiple pressure sensors 3 can be arranged on the base 1 without adding additional supports and external connectors when replacing batteries 10 of different sizes or performing multi-point measurements on the battery 10. This achieves multi-point measurement without significantly increasing the size and weight of the device, solving the technical problems of large size and inaccurate measurement of existing measuring clamps 2.

[0023] See Figure 3 and Figure 4 The base 1 protrudes to the side facing the clamp 2 to form a guide post 4, which extends along the sliding direction, and the clamp 2 is slidably connected to the guide post 4.

[0024] In practical applications, the guiding component can be a guide post 4, preferably a linear shaft that is perpendicular to or parallel to the mounting reference surface of the base 1 and the clamping direction of the battery 10. The guide post 4 is fixedly connected to the base 1 and extends along the sliding direction of the clamp 2 until the clamp 2 can be slidably connected to the guide post 4, ensuring that the clamp 2 only moves along the measurement direction under the action of the expansion force of the battery 10, thereby improving the accuracy of force transmission.

[0025] See again Figure 3 The clamp 2 includes a first clamping plate 21 and a second clamping plate 22. The first clamping plate 21 and the second clamping plate 22 are arranged opposite to each other and form a clamping space for clamping the battery 10. The first clamping plate 21 is pressed against the pressure sensor 3 and is slidably connected to the guide post 4. The second clamping plate 22 can selectively move closer to or further away from the first clamping plate 21.

[0026] In practical applications, the clamp 2 consists of a first clamping plate 21 and a second clamping plate 22 arranged opposite to each other, forming a clamping space for accommodating the battery 10. The first clamping plate 21 serves as the force transmission end, with its back side (the side facing away from the battery 10) aligned with the pressure sensor 3 on the base 1. The first clamping plate 21 is also slidably connected to the guide post 4 of the base 1 through a guide hole, so that when subjected to the expansion force of the battery 10, it moves along the direction of the guide post 4 and directly transmits the force to the pressure sensor 3.

[0027] The second clamping plate 22 is configured as an adjustable end that can selectively move closer to or further away from the first clamping plate 21. Specifically, after assembling the first clamping plate 21, the battery 10 is placed on the first clamping plate 21, and then the second clamping plate 22 is pressed onto the battery 10. The battery 10 is clamped by the weight of the second clamping plate 22. It is understood that the second clamping plate 22 and the first clamping plate 21 are preferably aligned. Alignment helps the two clamping plates maintain parallel contact, and the surface of the battery 10 is subjected to more even pressure. Specifically, a guide component can also be provided on the first clamping plate 21. The guide components on the second clamping plate 22 and the first clamping plate 21 are slidably connected to achieve the effect of the second clamping plate 22 moving relative to the first clamping plate 21, while ensuring that the second clamping plate 22 and the first clamping plate 21 are aligned.

[0028] To ensure that battery 10 is subjected to uniform pressure, please refer again. Figure 3 The clamp 2 includes a plurality of measuring elements 23 for assisting in leveling the second clamping plate 22. The plurality of measuring elements 23 are connected to the first clamping plate 21 or the second clamping plate 22. The plurality of measuring elements 23 are used to measure the parallelism at different positions of the first clamping plate 21 and the second clamping plate 22.

[0029] In practical applications, multiple measuring elements 23 are arranged in the relative areas of the first clamping plate 21 and the second clamping plate 22 to collect and indicate the relative parallelism of the two clamping plates at different positions. The data from multiple measuring elements 23 are used to determine the relative parallelism and to remind the operator to make minor adjustments to the second clamping plate 22 until the readings of all measuring elements 23 at each measuring point are consistent. For example, eight measuring elements 23 are symmetrically arranged along the four corners and center of the second clamping plate 22, with a preset value. When the data collected by a measuring element 23 differs from the preset value, the operator should make minor adjustments to the position of the second clamping plate 22 at that location until the value of the measuring element 23 matches the preset value. When the values ​​of all eight measuring elements 23 are consistent, it ensures that the pressure on all parts of the battery 10 is consistent, guaranteeing the consistency and repeatability of multi-point measurements.

[0030] This embodiment, by arranging multiple measuring elements 23 at different positions on the first clamping plate 21 and the second clamping plate 22, enables multi-point, real-time, and quantitative detection of the parallelism between the first clamping plate 21 and the second clamping plate 22, solving the problems of local misalignment, torsional errors, and corner warping caused by traditional single-point or visual leveling.

[0031] It is understandable that the measuring component 23 can be a structure such as a displacement sensor, a parallelism ruler, or a level.

[0032] See Figure 5 The clamp 2 includes a locking member 24, which passes through the second clamping plate 22 and is connected to the guide post 4 to fix the second clamping plate 22.

[0033] In practical applications, the locking element 24 is used to rigidly fix the clamping state after the second clamping plate 22 has been leveled and positioned. Specifically, the locking element 24 is arranged along the axial direction of the guide post 4, and is preferably a detachable mechanical fastening component, such as a screw or bolt. The guide post 4 has a corresponding mating structure, such as a threaded groove, and the second clamping plate 22 has a through hole or guide hole coaxial with the locking element 24. The locking element 24 passes through the through hole and is threadedly connected to the guide post 4 to achieve a fixed connection between the base 1 and the second clamping plate 22, preventing the second clamping plate 22 from shifting during the measurement process.

[0034] See again Figure 5 The locking element 24 is connected to the second clamping plate 22 and is movably connected to the guide post 4 to adjust the distance between the first clamping plate 21 and the second clamping plate 22.

[0035] In practical applications, the locking member 24 is fixedly connected to the second clamping plate 22 and forms a movable connection with the guide post 4 that can rotate relative to each other or slide back and forth, thereby realizing the adjustable and lockable function of the distance between the first clamping plate 21 and the second clamping plate 22 in the axial direction of the guide post 4.

[0036] Specifically, in one embodiment, a threaded groove may be provided in the guide post 4. The locking member 24 is rotatably connected to the second clamping plate 22 and threadedly connected to the guide post 4. By rotating the locking member 24, the locking member 24 moves relative to the guide post 4 in a straight line, thereby driving the second clamping plate 22 to move in a straight line, thus adjusting the distance between the second clamping plate 22 and the first clamping plate 21. With this configuration, the locking member 24 can both adjust the distance between the first clamping plate 21 and the second clamping plate 22 to adjust the parallelism of the second clamping plate 22, and also lock the second clamping plate 22 to prevent it from moving during measurement.

[0037] In one embodiment, the number of locking elements 24 should be no less than the number of measuring elements 23, and the positions of the locking elements 24 should correspond to the positions of the measuring elements 23. The locking elements 24 should be located adjacent to the measuring elements 23, so that the values ​​of the measuring elements 23 will change as the locking elements 24 are adjusted. For example, locking elements 24 are provided on both sides of the measuring elements 23. The multiple measuring elements 23 measure the parallelism of the second clamping plate 22 and the first clamping plate 21 at multiple positions. When the measured value at a certain point deviates from the preset value, the locking element 24 at that point is adjusted. The locking element 24 drives the second clamping plate 22 to move, thereby adjusting the parallelism of the second clamping plate 22 so that the measured values ​​at all points of the second clamping plate 22 meet the preset value, thereby ensuring that the battery 10 is subjected to uniform pressure.

[0038] See again Figure 5 To ensure accurate positioning of the battery 10 on the first clamping plate 21, multiple abutment blocks 26 are provided on one side of the battery 10. The abutment blocks 26 are fixedly or detachably connected to the first clamping plate 21. The abutment surface of the abutment block 26 is perpendicular to the plane of the clamp 2. The battery 10 is in contact with the abutment surface of the abutment block 26 to ensure that the battery 10 is parallel to the first clamping plate 21 along its length direction, preventing the battery 10 from being horizontally deflected, which would affect the accuracy of the measurement data.

[0039] See Figure 6 Multiple measuring elements 23 are arranged at intervals along the length of the clamp 2. In practical applications, multiple measuring elements 23 are arranged along the length of the clamp 2 and distributed at preset intervals to synchronously monitor the stress state of the first clamping plate 21 and the second clamping plate 22 at different length positions. The multi-point, sequentially spaced measurement scheme solves the problem that single-point measurement is difficult to reflect the parallelism error, bending deflection, and uneven load within the entire length of the clamp 2.

[0040] See again Figure 6 Multiple measuring elements 23 are divided into two groups, and the two groups of measuring elements 23 are symmetrically arranged on opposite sides of the clamp 2 along the width direction of the clamp 2.

[0041] In practical applications, each set of measuring elements 23 includes multiple measuring elements 23 spaced apart along the length of the clamp 2. Specifically, a measurement installation baseline is set on each side of the second clamping plate 22 along the width direction. The first set of measuring elements 23 is installed on the left baseline, and the second set of measuring elements 23 is installed on the right baseline. The number, model, and axial (length direction of the clamp 2) position of each measuring element 23 in the two sets correspond one-to-one, and their center distance is consistent with the central axis of the relative reference plane to form geometric symmetry about the central axis of the clamp 2. The two sets of symmetrically arranged measuring elements 23 establish a paired mirror measurement structure in the width direction, solving the technical problem that traditional single-sided or asymmetrical measuring points cannot accurately identify lateral tilt, lateral load, and clamp torsion.

[0042] See again Figure 6 The clamp 2 includes a fixing member 25, which is used to fix the measuring member 23 to the first clamping plate 21 or the second clamping plate 22.

[0043] In practical applications, the fixture 2 is equipped with a fixing member 25 for mounting the measuring element 23. The fixing member 25 is used to reliably fix the measuring element 23 to the first clamping plate 21 or the second clamping plate 22. Here, we will describe an example where the measuring element 23 is mounted on the second clamping plate 22. The fixing member 25 can be fixedly connected to the second clamping plate 22 or detachably connected. The measuring element 23 can be fixedly connected to the fixing member 25 by clamping, locking, or snapping, preventing the measuring element 23 from shaking during testing and affecting the accuracy of the measurement data. It is understood that if the measuring element 23 is mounted on the first clamping plate 21, the above method can be used as a reference.

[0044] See Figure 6 and Figure 7 The fixing member 25 has a clamping hole 252 and a clamping groove 251. The measuring member 23 passes through the clamping hole 252. The clamping groove 251 communicates with the clamping hole 252 and passes through the fixing member 25 along the radial direction of the clamping hole 252. The width of the clamping groove 251 can be selectively reduced or increased so that the clamping hole 252 clamps or releases the measuring member 23.

[0045] In practical applications, the fixing component 25 can be detachably connected to the measuring component 23 to achieve a fixing function. Specifically, the fixing component 25 adopts a slotted elastic clamping structure. The fixing component 25 has a clamping hole 252 that matches the outer diameter of the measuring component 23, and the measuring component 23 is axially inserted into the clamping hole 252. The fixing component 25 has a through clamping groove 251 radially extending from the outer edge of the clamping hole 252, so that the clamping hole 252 is connected to the outside to form an elastically retractable "C-shaped" clamping ring. An adjustable mechanism is provided at the clamping groove 251 to change the groove width. The adjustable mechanism can be a screw, bolt, or other structure. Threaded holes are provided on both sides of the clamping groove 251. The bolt passes through the threaded holes on both sides. When the bolt is tightened, it forces the groove to close, and the clamping hole 252 contracts radially to clamp the measuring component 23. When it is loosened, the groove opens and the hole diameter returns to normal to facilitate the release of the measuring component 23. By adjusting the width of the clamping groove 251, the clamping hole 252 can be expanded or contracted, allowing the measuring part 23 to be quickly installed and fixed or its position finely adjusted, reducing the tedious steps of repeated assembly and disassembly.

[0046] It should be noted that in other embodiments, the fixing member 25 can also fix the measuring member 23 in other ways, such as snap-fit ​​or plug-in, and this application does not limit this.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0049] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A test fixture, characterized in that, include: Base; A clamp for holding the battery is slidably connected to the base, and the sliding direction is parallel to the holding direction of the battery; A pressure sensor is connected to the base and protrudes from the base toward the clamp, the clamp being in contact with the pressure sensor along the sliding direction.

2. The test fixture according to claim 1, characterized in that, The base protrudes to one side of the clamp to form a guide post, the guide post extends along the sliding direction, and the clamp is slidably connected to the guide post.

3. The test fixture according to claim 2, characterized in that, The clamp includes a first clamping plate and a second clamping plate, which are arranged opposite to each other to form a clamping space for holding the battery. The first clamping plate is pressed against the pressure sensor and slidably connected to the guide post. The second clamping plate can selectively move closer to or further away from the first clamping plate.

4. The test fixture according to claim 3, characterized in that, The fixture includes a plurality of measuring elements for assisting in leveling the second clamping plate. The plurality of measuring elements are connected to the first clamping plate or the second clamping plate and are used to measure the parallelism of the first clamping plate and the second clamping plate at different positions.

5. The test fixture according to claim 3, characterized in that, The clamp includes a locking element that passes through the second clamping plate and is connected to the guide post to restrict the movement of the second clamping plate.

6. The test fixture according to claim 5, characterized in that, The locking member is connected to the second clamping plate and movably connected to the guide post to adjust the distance between the first clamping plate and the second clamping plate.

7. The test fixture according to claim 4, characterized in that, Along the length of the fixture, a plurality of measuring elements are arranged at intervals.

8. The test fixture according to claim 4, characterized in that, The multiple measuring elements are divided into two groups, and the two groups of measuring elements are symmetrically arranged on opposite sides of the clamp along the width direction of the clamp.

9. The test fixture according to claim 4, characterized in that, The clamp includes a fixing member for securing the measuring element to the first clamp or the second clamp.

10. The test fixture according to claim 9, characterized in that, The fixing member has a clamping hole and a clamping groove. The measuring member passes through the clamping hole. The clamping groove communicates with the clamping hole and extends through the fixing member in the radial direction of the clamping hole. The width of the clamping groove can be selectively reduced or increased to clamp or release the measuring member through the clamping hole.

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