Test tool

Abstract

The utility model discloses a test tool, which is used for detecting the expansive force of a single battery, and comprises a clamp, the clamp is provided with two clamping plates which are arranged at an interval in a first direction, and the two clamping plates are matched to define a clamping space for clamping the single battery; the flexible pressure sensor is a flexible part, is arranged on the side, facing the clamping space, of the clamping plate, is suitable for being connected between the single battery and the clamping plate in an abutting mode, and is configured to be capable of detecting the pressure of the single battery; and the flexible temperature sensor is a flexible part, is arranged on one side, facing the clamping space, of the clamping plate, is suitable for being connected between the single battery and the clamping plate in an abutting mode, and is configured to be capable of detecting the temperature of the single battery. According to the test tool provided by the utility model, the pressure value and the temperature value of the surface of the single battery can be effectively measured, and the accuracy of the measurement result can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of testing, in particular to a testing tool. Background Art

[0002] The number of new energy electric vehicles is rapidly increasing, and lithium-ion power batteries are also experiencing significant growth. During the charge and discharge process, volume changes and temperature rise in lithium-ion batteries significantly impact the battery's lifespan and safety. Therefore, a comprehensive understanding of the cell's expansion force and temperature during operation is crucial, providing valuable guidance for subsequent cell design and operational configuration.

[0003] Existing battery expansion force detection devices can only detect the maximum expansion force and output feedback, failing to accurately measure the battery's expansion force. Furthermore, temperature data collected during cell testing is often affected by the external environment, resulting in errors in the collected temperature. This inaccurate cell temperature test results make it impossible to accurately evaluate the temperature characteristics of the cell during testing. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a testing fixture that can effectively measure the pressure and temperature values ​​on the surface of a battery cell and effectively improve the accuracy of the measurement results.

[0005] According to the test fixture of the present invention, it is used to detect the expansion force of a battery cell, and the test fixture includes: a clamp, the clamp having two clamping plates arranged at intervals in a first direction, and the two clamping plates cooperate to define a clamping space for clamping the battery cell; a flexible pressure sensor, the flexible pressure sensor is a flexible part, and is provided on the side of the clamping plate facing the clamping space, and is suitable for abutting between the battery cell and the clamping plate, and the flexible pressure sensor is configured to detect the pressure of the battery cell; a flexible temperature sensor, the flexible temperature sensor is a flexible part, and is provided on the side of the clamping plate facing the clamping space, and is suitable for abutting between the battery cell and the clamping plate, and the flexible temperature sensor is configured to detect the temperature of the battery cell.

[0006] According to the test fixture of the present invention, a clamp, a flexible pressure sensor and a flexible temperature sensor are set in the test fixture, the clamp has two clamping plates arranged at intervals in a first direction, the two clamping plates are used to clamp the battery cell, the flexible pressure sensor is a flexible part and is set between the clamping plates and the battery cell and abuts against the battery cell, the flexible pressure sensor is used to detect the pressure of the battery cell, the flexible temperature sensor is a flexible part and is set between the clamping plates and the battery cell and abuts against the battery cell, the flexible temperature sensor is used to detect the temperature of the battery cell, it can effectively measure the pressure value and temperature value on the surface of the battery cell, and can effectively improve the accuracy of the measurement results.

[0007] In some embodiments, the test fixture further includes: a monitor, and the flexible pressure sensor and the flexible temperature sensor are both electrically connected to the monitor via wires.

[0008] In some embodiments, the flexible pressure sensor and the flexible temperature sensor are respectively arranged on opposite sides of the battery cell in the first direction; or, the flexible pressure sensor and the flexible temperature sensor are integrated into an integrated pressure and temperature sensor, and the pressure and temperature sensor is provided on one side of the two clamping plates facing the clamping space.

[0009] In some embodiments, the flexible pressure sensor includes multiple pressure detection parts, and the multiple pressure detection parts are arranged in an array in a plane perpendicular to the first direction; and / or, the flexible temperature sensor includes multiple temperature detection parts, and the multiple temperature detection parts are arranged in an array in a plane perpendicular to the first direction.

[0010] In some embodiments, in a projection plane perpendicular to the first direction, the projection of the flexible pressure sensor and the projection of the flexible temperature sensor are both completely within the projection range of the clamping plate and completely cover the projection of the battery cell.

[0011] In some embodiments, a second length of any one of the flexible pressure sensor and the flexible temperature sensor in the second direction is greater than or equal to 105 mm and less than or equal to 1600 mm, and a second width of any one of the flexible pressure sensor and the flexible temperature sensor in the third direction is greater than or equal to 15 mm and less than or equal to 620 mm.

[0012] In some embodiments, the clamping plate is a metal plate or an alloy plate, and the thickness of the clamping plate in the first direction is greater than or equal to 8 mm.

[0013] In some embodiments, the first length of the splint in the second direction is greater than or equal to 110 mm and less than or equal to 1700 mm, the first width of the splint in the third direction is greater than or equal to 20 mm and less than or equal to 640 mm, and the first direction, the second direction and the third direction intersect each other.

[0014] In some embodiments, the periphery of the two clamps is provided with a plurality of fastening holes arranged at intervals, and the clamp further comprises: a plurality of fasteners, and the two clamps are fixedly connected by the plurality of fasteners.

[0015] In some embodiments, each of the clamping plates is provided with at least four fastening holes, and the plurality of fastening holes are symmetrically arranged on both side edges of the clamping plate in the width direction.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a test fixture according to an embodiment of the present utility model;

[0018] Figure 2 is a schematic diagram of a clamp according to an embodiment of the present utility model;

[0019] Figure 3 3 is a schematic diagram of a flexible pressure sensor according to an embodiment of the present invention, wherein the battery cell is located on the upper side of the flexible pressure sensor and abuts against the flexible pressure sensor.

[0020] Reference numerals:

[0021] 100. Test tooling;

[0022] 10. Clamp; 11. Clamp; 110. Fastening hole; 111. First clamp; 112. Second clamp; 12. Fastener; 121. Bolt; 122. Nut;

[0023] 20. Flexible pressure sensor;

[0024] 30. Flexible temperature sensor;

[0025] 40. Monitor;

[0026] 50. Wire;

[0027] 200. Battery cell. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] Reference below Figure 1-Figure 3 A test fixture 100 according to an embodiment of the present invention is described.

[0030] like Figure 1-Figure 3 As shown, a testing tool 100 according to an embodiment of the present invention is used to detect the expansion force of a battery cell 200 . The testing tool 100 includes: a fixture 10 , a flexible pressure sensor 20 and a flexible temperature sensor 30 .

[0031] The clamp 10 has a first direction (eg Figure 1 Two clamping plates 11 are spaced apart in the vertical direction (as shown in the figure), and the two clamping plates 11 cooperate to define a clamping space for clamping the battery cell 200; the flexible pressure sensor 20 is a flexible component and is provided on the side of the clamping plate 11 facing the clamping space, and is suitable for abutting between the battery cell 200 and the clamping plate 11, and the flexible pressure sensor 20 is configured to detect the pressure of the battery cell 200; the flexible temperature sensor 30 is a flexible component and is provided on the side of the clamping plate 11 facing the clamping space, and is suitable for abutting between the battery cell 200 and the clamping plate 11, and the flexible temperature sensor 30 is configured to detect the temperature of the battery cell 200.

[0032] For ease of description, the thickness direction of the splint 11 is defined as the first direction, the length direction of the splint 11 is defined as the second direction, and the width direction of the splint 11 is defined as the third direction. The first, second, and third directions intersect with each other. In a specific example, the first, second, and third directions are perpendicular to each other, with the first direction being the up-down direction, the second direction being the left-right direction, and the third direction being the front-back direction.

[0033] It should be noted that flexible components typically have good ductility and flexibility, and can deform when subjected to external forces. When the external force disappears, the flexible component can return to its original shape or maintain its new shape without breaking or damaging. The flexible pressure sensor 20 and the flexible temperature sensor 30 in this application are both flexible components. Furthermore, the flexible component can be a polymer film, which has the advantages of being lightweight, soft, and corrosion-resistant.

[0034] For example Figure 1As shown, the clamp 10 has a first clamping plate 111 and a second clamping plate 112 arranged at intervals in the up and down directions, the first clamping plate 111 is arranged on the upper side of the second clamping plate 112, and the first clamping plate 111 and the second clamping plate 112 are arranged in parallel. Furthermore, the first clamping plate 111 and the second clamping plate 112 can be rectangular plates of the same size.

[0035] In a specific example, for example Figure 1 As shown, the flexible pressure sensor 20 is arranged on the upper side of the second clamping plate 112 and abuts against the upper surface of the second clamping plate 112, and the flexible temperature sensor 30 is arranged on the lower side of the first clamping plate 111 and abuts against the lower surface of the first clamping plate 111. When performing measurements, the battery cell 200 can be arranged between the flexible pressure sensor 20 and the flexible temperature sensor 30, with the lower surface of the battery cell 200 abutting the flexible pressure sensor 20 and the upper surface of the battery cell 200 abutting the flexible temperature sensor 30.

[0036] In this embodiment, when measuring the pressure and temperature values ​​on the surface of a battery cell 200, an external force is applied to the two clamps 11 until the preload of the clamp 10 is reached. This allows the clamps 11 to secure the battery cell 200, and the surface of the battery cell 200 abuts the flexible pressure sensor 20 and the flexible temperature sensor 30. The battery cell 200 is then charged and discharged, during which its volume and temperature change.

[0037] The flexible pressure sensor 20 adheres well to the surface of the battery cell 200 during the charge and discharge process, ensuring good contact even when the battery cell 200 deforms. This allows the flexible pressure sensor 20 to accurately measure the pressure on the surface of the battery cell 200. The flexible temperature sensor 30 also adapts well to changes in the surface of the battery cell 200 during the charge and discharge process. Furthermore, the flexible temperature sensor 30 has excellent thermal conductivity, allowing it to accurately measure the surface temperature of the battery cell 200.

[0038] According to the test jig 100 of the embodiment of the present invention, a clamp 10, a flexible pressure sensor 20 and a flexible temperature sensor 30 are set in the test jig 100, the clamp 10 has two clamps 11 arranged at intervals in a first direction, the two clamps 11 are used to clamp the battery cell 200, the flexible pressure sensor 20 is a flexible part and is arranged between the clamp 11 and the battery cell 200 and abuts against the battery cell 200, the flexible pressure sensor 20 is used to detect the pressure of the battery cell 200, the flexible temperature sensor 30 is a flexible part and is arranged between the clamp 11 and the battery cell 200 and abuts against the battery cell 200, the flexible temperature sensor 30 is used to detect the temperature of the battery cell 200, and can effectively measure the pressure value and temperature value on the surface of the battery cell 200, and can effectively improve the accuracy of the measurement results.

[0039] In one embodiment of the present invention, Figure 1 As shown, the test fixture 100 further includes: a monitor 40, and the flexible pressure sensor 20 and the flexible temperature sensor 30 are both electrically connected to the monitor 40 via a wire 50. For example Figure 1 As shown, there may be two wires 50 , one end of one wire 50 being connected to the flexible pressure sensor 20 and the other end being connected to the monitor 40 . Another wire 50 may have one end being connected to the flexible temperature sensor 30 and the other end being connected to the monitor 40 .

[0040] When measuring the pressure and temperature values ​​on the surface of the battery cell 200, the flexible pressure sensor 20 can measure the pressure value on the surface of the battery cell 200 and transmit the data to the monitor 40 via the wire 50. The flexible temperature sensor 30 can measure the temperature value on the surface of the battery cell 200 and transmit the data to the monitor 40 via the wire 50. The monitor 40 can not only display the pressure and temperature on the surface of the battery cell 200 in real time, but also record and analyze the data, which can play a positive role in the subsequent design and testing of the battery cell 200.

[0041] In this embodiment, a monitor 40 is set in the test fixture 100, and the flexible pressure sensor 20 and the flexible temperature sensor 30 are electrically connected to the monitor 40 through a wire 50. This can not only display the pressure and temperature on the surface of the battery cell 200 in real time, but also record and analyze the data, thereby effectively optimizing the subsequent design and testing of the battery cell 200, thereby effectively improving work efficiency.

[0042] In one embodiment of the present invention, Figure 1As shown, the flexible pressure sensor 20 and the flexible temperature sensor 30 are respectively arranged on two opposite sides of the battery cell 200 in the first direction; or, the flexible pressure sensor 20 and the flexible temperature sensor 30 are integrated into an integrated pressure and temperature sensor, and a pressure and temperature sensor is provided on one side of the two clamping plates 11 facing the clamping space.

[0043] For example, the flexible pressure sensor 20 is arranged on the lower side of the battery cell 200 and abuts against the lower surface of the battery cell 200, and the flexible temperature sensor 30 is arranged on the upper side of the battery cell 200 and abuts against the upper surface of the battery cell 200; for another example, the flexible pressure sensor 20 is arranged on the upper side of the battery cell 200 and abuts against the upper surface of the battery cell 200, and the flexible temperature sensor 30 is arranged on the lower side of the battery cell 200 and abuts against the lower surface of the battery cell 200.

[0044] In a specific example, for example Figure 1 As shown, the flexible pressure sensor 20 is disposed on the lower side of the battery cell 200 and abuts against the lower surface of the battery cell 200, and the flexible temperature sensor 30 is disposed on the upper side of the battery cell 200 and abuts against the upper surface of the battery cell 200. The flexible pressure sensor 20 can accurately measure the pressure value on the lower surface of the battery cell 200, and the flexible temperature sensor 30 can accurately measure the temperature value on the upper surface of the battery cell 200.

[0045] In this embodiment, by arranging the flexible pressure sensor 20 and the flexible temperature sensor 30 on opposite sides of the battery cell 200 in the first direction, interference between the flexible pressure sensor 20 and the flexible temperature sensor 30 can be effectively avoided, thereby effectively improving the accuracy of the measurement result.

[0046] For example, there are two pressure and temperature sensors, one of which is disposed on the upper surface of the battery cell 200 and in contact with the upper surface of the battery cell 200, and the other is disposed on the lower surface of the battery cell 200 and in contact with the lower surface of the battery cell 200. Thus, the two pressure and temperature sensors can simultaneously and accurately measure the temperature and pressure values ​​of the upper and lower surfaces of the battery cell 200.

[0047] This embodiment integrates the flexible pressure sensor 20 and the flexible temperature sensor 30 into an integrated pressure and temperature sensor, and a pressure and temperature sensor is provided on the side of the two clamping plates 11 facing the clamping space. This not only effectively reduces the number of sensors, but also effectively improves the comprehensiveness of the measurement results, thereby providing a more scientific basis for the design and testing of the battery cell 200.

[0048] In one embodiment of the present invention, Figure 1-Figure 3As shown, the flexible pressure sensor 20 includes a plurality of pressure detection parts, which are arranged in an array in a plane perpendicular to the first direction; and / or, the flexible temperature sensor 30 includes a plurality of temperature detection parts, which are arranged in an array in a plane perpendicular to the first direction.

[0049] For example, the multiple pressure detection parts of the flexible pressure sensor 20 are arranged in an array in a plane perpendicular to the up-down direction; for another example, the multiple temperature detection parts of the flexible temperature sensor 30 are arranged in an array in a plane perpendicular to the up-down direction; for another example, the multiple pressure detection parts of the flexible pressure sensor 20 are arranged in an array in a plane perpendicular to the up-down direction and the multiple temperature detection parts of the flexible temperature sensor 30 are arranged in an array in a plane perpendicular to the up-down direction.

[0050] In a specific example, for example Figure 2 and Figure 3 As shown, the flexible pressure sensor 20 is positioned on the underside of the battery cell 200, with its multiple pressure detection components arranged in an array within a plane perpendicular to the vertical direction. The flexible temperature sensor 30 is positioned on the upper side of the battery cell 200, with its multiple temperature detection components arranged in an array within a plane perpendicular to the vertical direction. As a result, the multiple pressure detection components can effectively detect pressure values ​​at various locations on the surface of the battery cell 200, and the multiple temperature detection components can effectively detect temperature values ​​at various locations on the surface of the battery cell 200.

[0051] This embodiment can further improve the comprehensiveness of the measurement data by providing multiple pressure detection parts in the flexible pressure sensor 20, and the multiple pressure detection parts are arranged in an array in a plane perpendicular to the first direction, and / or providing multiple temperature detection parts in the flexible temperature sensor 30, and the multiple temperature detection parts are arranged in an array in a plane perpendicular to the first direction, thereby effectively ensuring the reliability of the measurement results.

[0052] In one embodiment of the present invention, Figure 1-Figure 3 As shown, in the projection plane perpendicular to the first direction, the projection of the flexible pressure sensor 20 and the projection of the flexible temperature sensor 30 are both completely located within the projection range of the clamping plate 11 and completely cover the projection of the battery cell 200 .

[0053] In a specific example, for example Figure 1-Figure 3 As shown, the two clamps 11 have exactly the same size. In the projection plane perpendicular to the up and down directions, the projection of the flexible pressure sensor 20 and the projection of the flexible temperature sensor 30 are both completely within the projection range of the clamp 11, that is, the projection area of ​​the flexible pressure sensor 20 and the projection area of ​​the flexible temperature sensor 30 are smaller than the projection area of ​​the clamp 11.

[0054] In a projection plane perpendicular to the up and down directions, the projection of the battery cell 200 is completely located within the projection range of the flexible pressure sensor 20 and the projection of the battery cell 200 is completely located within the projection range of the flexible temperature sensor 30. That is, the projection area of ​​the flexible pressure sensor 20 and the projection area of ​​the flexible temperature sensor 30 are larger than the projection area of ​​the battery cell 200.

[0055] In this embodiment, the projection of the flexible pressure sensor 20 and the projection of the flexible temperature sensor 30 are completely set within the projection range of the splint 11 in the projection plane perpendicular to the first direction, and both completely cover the projection of the battery cell 200. This enables the flexible pressure sensor 20 and the flexible temperature sensor 30 to be tightly attached to the surface of the battery cell 200, effectively avoiding the phenomenon of local non-fitting between the sensor and the surface of the battery cell 200, thereby effectively realizing comprehensive detection of the pressure and temperature on the surface of the battery cell 200, and effectively ensuring the integrity of the measurement results.

[0056] In one embodiment of the present invention, Figure 1-Figure 3 As shown, any one of the flexible pressure sensor 20 and the flexible temperature sensor 30 is in the second direction (eg Figure 1-Figure 3 The second length in the left-right direction shown in FIG is greater than or equal to 105 mm and less than or equal to 1600 mm, and any one of the flexible pressure sensor 20 and the flexible temperature sensor 30 is greater than or equal to 105 mm in the third direction (for example, Figure 2 and Figure 3 The second width in the front-to-back direction (shown in ) is greater than or equal to 15 mm and less than or equal to 620 mm.

[0057] For example Figure 2 and Figure 3 As shown, the second length L2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the left-right direction is greater than or equal to 105 mm and less than or equal to 1600 mm, and the second width D2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the front-to-back direction is greater than or equal to 15 mm and less than or equal to 620 mm. For example, the second length L2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the left-to-right direction can be 200 mm, 400 mm, 600 mm, 800 mm, 1000 mm, 1200 mm, 1400 mm, and 1600 mm. For example, the second width D2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the front-to-back direction can be 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, and 600 mm.

[0058] Preferably, the second length L2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the left-right direction is greater than or equal to 285 mm and less than or equal to 1310 mm, and the second width D2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the front-to-back direction is greater than or equal to 85 mm and less than or equal to 310 mm. For example, the second length L2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the left-to-right direction can be 300 mm, 500 mm, 700 mm, 900 mm, 1100 mm, and 1300 mm. For example, the second width D2 of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the front-to-back direction can be 100 mm, 150 mm, 200 mm, 250 mm, and 300 mm.

[0059] In this embodiment, by setting the second length of any one of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the second direction to be greater than or equal to 105 mm and less than or equal to 1600 mm, and setting the second width of any one of the flexible pressure sensor 20 and the flexible temperature sensor 30 in the third direction to be greater than or equal to 15 mm and less than or equal to 620 mm, the sizes of the pressure sensor and the flexible temperature sensor 30 can be changed to adapt to the testing requirements of battery cells 200 of different sizes, thereby effectively achieving the measurement of battery cells 200 of different sizes, and effectively increasing the versatility and flexibility of the test tool 100.

[0060] In one embodiment of the present invention, Figure 1 As shown, the clamping plate 11 is a metal plate or alloy plate, and the thickness of the clamping plate 11 in the first direction is greater than or equal to 8 mm. For example, the thickness H of the clamping plate 11 in the vertical direction can be 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, and 13 mm. Metal plates or alloy plates have the advantages of low cost, high strength, resistance to deformation, and corrosion resistance. Metal plates or alloy plates are also easy to process.

[0061] This embodiment utilizes a metal or alloy plate as the clamping plate 11, with a thickness in the first direction of 8 mm or greater. This effectively increases the structural strength of the clamping plate 11, ensuring that the clamping plate 11 is not easily deformed during testing. This allows the flexible pressure sensor 20 and the flexible temperature sensor 30 to adhere closely to the surface of the battery cell 200, thereby effectively ensuring the accuracy of the measurement results. Furthermore, the metal or alloy plate has a simple structure and is easy to process, effectively reducing costs.

[0062] In one embodiment of the present invention, Figure 1 and Figure 2As shown, the first length of the splint 11 in the second direction is greater than or equal to 110 mm and less than or equal to 1700 mm, the first width of the splint 11 in the third direction is greater than or equal to 20 mm and less than or equal to 640 mm, and the first direction, the second direction and the third direction intersect with each other.

[0063] For example, the first length L1 of the clamping plate 11 in the left-right direction may be 200 mm, 400 mm, 600 mm, 800 mm, 1000 mm, 1200 mm, 1400 mm, and 1600 mm. For example, the first width D1 of the clamping plate 11 in the front-to-back direction may be 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, and 600 mm. In a specific example, the first direction, the second direction, and the third direction are perpendicular to each other, and the first direction is the up-down direction, the second direction is the left-to-right direction, and the third direction is the front-to-back direction.

[0064] Preferably, the first length L1 of the splint 11 in the left-right direction is greater than or equal to 290 mm and less than or equal to 1320 mm, and the first width D1 of the splint 11 in the front-back direction is greater than or equal to 90 mm and less than or equal to 320 mm. For example, the first length L1 of the splint 11 in the left-right direction can be 300 mm, 500 mm, 700 mm, 900 mm, 1100 mm, and 1300 mm. For example, the first width D1 of the splint 11 in the front-back direction can be 100 mm, 150 mm, 200 mm, 250 mm, and 300 mm.

[0065] This embodiment sets the first length of the splint 11 in the second direction to be greater than or equal to 110 mm and less than or equal to 1700 mm, and sets the first width of the splint 11 in the third direction to be greater than or equal to 20 mm and less than or equal to 640 mm. The size of the splint 11 can be changed to accommodate pressure sensors and flexible temperature sensors 30 of different sizes, thereby meeting the measurement requirements of battery cells 200 of different sizes, thereby effectively ensuring that the splint 11 can completely cover the battery cell 200, and further effectively ensuring the reliability of the measurement results.

[0066] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the periphery of the two clamping plates 11 is provided with a plurality of fastening holes 110 arranged at intervals, and the clamp 10 further comprises: a plurality of fasteners 12, and the two clamping plates 11 are fixedly connected by the plurality of fasteners 12. Figure 2As shown, the fastening holes 110 can be holes for bolts 121, and the fasteners 12 can be bolts 121 and nuts 122. When clamping the two clamping plates 11, the fasteners 12 are placed in the fastening holes 110. By tightening the fasteners 12, the clamping plates 11 can clamp the battery cells 200. Furthermore, the fasteners 12 can be tightened according to the preload force required by the test. In addition, the number and position of the fastening holes 110 used can be selected according to the test requirements to ensure that the clamping plates 11 can better clamp the battery cells 200.

[0067] This embodiment provides multiple fastening holes 110 spaced apart around the periphery of both clamps 11, and multiple fasteners 12 are provided in the clamp 10. The two clamps 11 are fixedly connected by the multiple fasteners 12. This effectively ensures uniform force on the clamps 11, preventing deformation of the clamps 11 due to localized excessive force, thereby effectively protecting the clamps 11 and effectively improving the stability of the clamps 11 when clamping the battery cells 200. Furthermore, the operation process of clamping the battery cells 200 is effectively simplified, effectively improving operational convenience.

[0068] In one embodiment of the present invention, Figure 2 As shown, each splint 11 is provided with at least four fastening holes 110, and the plurality of fastening holes 110 are symmetrically arranged on both sides of the width direction of the splint 11. For example, the number of fastening holes 110 provided on each splint 11 can be four, six, eight, ten, twelve, fourteen, or more, and the plurality of fastening holes 110 of each splint 11 are symmetrically arranged on both sides of the splint 11 in the front-to-back direction.

[0069] In a specific example, for example Figure 2 As shown, four fastening holes 110 are provided at intervals along the front edge of each splint 11, and four fastening holes 110 are provided at intervals along the rear edge of each splint 11. The fastening holes 110 on the front and rear edges of each splint 11 are symmetrically arranged, and the fastening holes 110 of the two splints 11 are correspondingly arranged in the vertical direction.

[0070] This embodiment provides at least four fastening holes 110 on each clamp 11, and multiple fastening holes 110 are symmetrically arranged on the two side edges of the clamp 11 in the width direction. This can effectively avoid insufficient clamping force of the clamp 11 on the battery cell 200 due to insufficient number of fastening holes 110, thereby effectively avoiding loosening and displacement of the battery cell 200 during the test, and thus effectively ensuring the stability of the test process and the reliability of the measurement results.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0072] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0073] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0075] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A test fixture for detecting the expansion force of a battery cell, characterized in that: include: A clamp having two clamping plates spaced apart in a first direction, wherein the two clamping plates cooperate to define a clamping space for clamping a battery cell; a flexible pressure sensor, the flexible pressure sensor being a flexible member and being disposed on a side of the clamping plate facing the clamping space and being adapted to abut between the battery cell and the clamping plate, the flexible pressure sensor being configured to detect pressure of the battery cell; The flexible temperature sensor is a flexible member and is provided on a side of the clamping plate facing the clamping space and is suitable for abutting between the battery cell and the clamping plate. The flexible temperature sensor is configured to detect the temperature of the battery cell.

2. The test fixture according to claim 1, characterized in that: Also includes: The flexible pressure sensor and the flexible temperature sensor are both electrically connected to the monitor through wires.

3. The test fixture according to claim 1, characterized in that: The flexible pressure sensor and the flexible temperature sensor are respectively arranged on two opposite sides of the battery cell in the first direction; or, The flexible pressure sensor and the flexible temperature sensor are integrated into an integrated pressure and temperature sensor, and the pressure and temperature sensor is provided on one side of the two clamping plates facing the clamping space.

4. The test fixture according to claim 1, characterized in that: The flexible pressure sensor includes a plurality of pressure detection portions, and the plurality of pressure detection portions are arranged in an array in a plane perpendicular to the first direction; and / or, The flexible temperature sensor includes a plurality of temperature detection portions, and the plurality of temperature detection portions are arranged in an array in a plane perpendicular to the first direction.

5. The test tool according to any one of claims 1 to 4, characterized in that: In a projection plane perpendicular to the first direction, the projection of the flexible pressure sensor and the projection of the flexible temperature sensor are both completely located within the projection range of the clamping plate and completely cover the projection of the battery cell.

6. The test fixture according to claim 5, characterized in that: A second length of either the flexible pressure sensor or the flexible temperature sensor in the second direction is greater than or equal to 105 mm and less than or equal to 1600 mm, and a second width of either the flexible pressure sensor or the flexible temperature sensor in the third direction is greater than or equal to 15 mm and less than or equal to 620 mm.

7. The test fixture according to claim 1, characterized in that: The clamping plate is a metal plate or an alloy plate, and the thickness of the clamping plate in the first direction is greater than or equal to 8 mm.

8. The test fixture according to claim 1, characterized in that: The first length of the splint in the second direction is greater than or equal to 110 mm and less than or equal to 1700 mm, the first width of the splint in the third direction is greater than or equal to 20 mm and less than or equal to 640 mm, and the first direction, the second direction and the third direction intersect with each other.

9. The test fixture according to claim 1, characterized in that: The peripheries of the two clamps are each provided with a plurality of fastening holes arranged at intervals, and the clamp further comprises: a plurality of fasteners, and the two clamps are fixedly connected by the plurality of fasteners.

10. The test fixture according to claim 9, characterized in that: Each of the clamping plates is provided with at least four fastening holes, and the plurality of fastening holes are symmetrically arranged on both side edges of the clamping plate in the width direction.

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