Test fixture for batteries

Abstract

The application discloses a kind of test tool of battery, belong to battery test technical field.Test tool includes sensor and heating piece, the sensor includes bearing surface, the bearing surface is used to carry the battery to be measured, the sensor is used to test the pressure that bearing surface receives;The heating piece is used to heat the battery to be measured carried on the bearing surface.By using the bearing surface of sensor to carry the battery to be measured, when heating piece initiates the thermal runaway of battery to be measured, sensor can obtain the pressure data generated by battery to be measured to bearing surface, and then simulate the influence on the bottom of battery box when lithium battery thermal runaway, make up the test blank in the prior art, provide data support for the safety design of battery system bottom, and then improve the comprehensiveness and accuracy of thermal runaway test.

Description

Technical Field

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

[0002] With the continuous development of new energy vehicles, the production and use of lithium batteries are becoming increasingly large-scale, and the safety requirements for lithium batteries are also becoming increasingly stringent. Therefore, thermal runaway testing of lithium batteries is usually required. There are three main methods for initiating thermal runaway testing of lithium batteries: heating, nail penetration, and internal short circuit.

[0003] In related technologies, thermal runaway tests involving heating lithium batteries can only simulate the damage caused by thermal runaway to the lithium battery or the top cover of the battery box, resulting in insufficient data collection. Utility Model Content

[0004] This application provides a battery testing fixture to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, a battery testing fixture is provided, comprising:

[0006] A sensor, comprising a bearing surface for supporting a battery under test, wherein the sensor is used to test the pressure exerted on the bearing surface; and,

[0007] A heating element, used to heat the battery under test supported on the bearing surface.

[0008] Optionally, the test fixture further includes a blocking member disposed toward the bearing surface of the sensor, the blocking member being configured to be on the movement path of the battery under test in a thermal runaway state.

[0009] By setting up a blocking component to simulate the top cover of a battery pack, the battery under test can be blocked in the thermal runaway state, causing the battery under test to bounce back onto the sensor's bearing surface. This better simulates the real-world situation and collects the impact force data of the battery under test hitting the sensor a second time, thus further improving the thermal runaway test.

[0010] Optionally, the test fixture further includes a limiting member disposed on the sensor;

[0011] The limiting member includes a limiting hole, the opening of which faces the blocking member, and the limiting hole is used to accommodate the battery under test supported by the bearing surface.

[0012] By setting a limiting component with a limiting hole and setting the opening of the limiting hole to face the blocking component, the movement path of the battery under test is kept within a preset range, thereby guiding the battery under test to hit the blocking component and bounce back, ensuring that the battery under test hits the sensor a second time, thus ensuring the repeatability of the thermal runaway test.

[0013] Optionally, the limiting hole extends along the bearing surface toward the blocking member, and the distance between the blocking member and the end face of the limiting hole is greater than or equal to 5 mm and less than or equal to 70 mm.

[0014] By setting the distance between the blocking member and the end face of the limiting hole within a suitable range, the probability of the battery under test bursting out of the limiting hole is reduced, and the situation of the battery under test in the battery pack can be better simulated to obtain more accurate data.

[0015] Optionally, the limiting member includes:

[0016] Mounting portion, the mounting portion being disposed on the sensor; and,

[0017] A limiting part is provided, which is connected to the mounting part, and at least a portion of the limiting part protrudes from the side of the mounting part facing away from the sensor. The limiting part is provided with the limiting hole.

[0018] By placing the mounting part directly on the sensor, a solid foundation is provided for the limiting component, reducing the probability of displacement or loosening of the limiting component during thermal runaway of the battery under test, thereby ensuring the stability of the testing device.

[0019] By providing clearance holes in the mounting section, space is provided for the wires connected to the heating element, allowing the wires to pass through the mounting section neatly. This effectively reduces the risk of the wires being crushed and damaged due to messy arrangement between the limiting component and the sensor, ensuring the stability of the power supply to the heating element while maintaining the good compactness of the test fixture structure.

[0020] The mounting part is provided with a clearance hole, which communicates with the limiting hole. The test fixture also includes a wire, which passes through the clearance hole to connect with the heating element.

[0021] Optionally, the test fixture further includes a mounting frame, and the blocking member is movably connected to the mounting frame so that the blocking member can move along the bearing surface toward the blocking member.

[0022] By setting up a mounting bracket to support the blocking component, and the movable connection between the blocking component and the mounting bracket, the operator can flexibly adjust the distance between the blocking component and the battery under test according to different types and sizes of battery packs, thereby accurately simulating the gap between the top cover and the internal cells of various battery packs. This expands the application range of the test fixture in the embodiments of this application while improving the accuracy of the test data.

[0023] Optionally, the mounting bracket includes:

[0024] The base plate, wherein the sensor is mounted on the base plate; and,

[0025] A support rod extends along the bearing surface toward the blocking member and is disposed on the base plate, and the blocking member is movably connected to the support rod.

[0026] By setting up a base plate, a stable and reliable support platform is provided for the entire test fixture, eliminating the need to install sensors in other specific locations and reducing the environmental requirements of the test fixture.

[0027] Optionally, the mounting bracket further includes locking fasteners that connect the support rod and the blocking member respectively, for locking or unlocking the relative position of the blocking member and the support rod.

[0028] By setting a locking fastener connecting the support rod and the blocking component, the blocking component can be fixed in place when adjusted to the appropriate position. This reduces the probability of the blocking component shaking or shifting when it is impacted by the battery under test, making it easier to conduct multiple tests and improving the stability of the test fixture.

[0029] Optionally, the blocking member includes a baffle and a screw, the screw being connected to the side of the baffle facing away from the base plate, and the locking element includes:

[0030] A positioning plate, wherein the positioning plate is connected to the end of the support rod opposite to the base plate, and the screw passes through the positioning plate and is movably connected to the positioning plate; and,

[0031] Multiple first bolts are threadedly connected to the screw, and at least one first bolt is located on the side of the positioning plate facing the baffle, and at least one first bolt is located on the side of the positioning plate facing away from the baffle.

[0032] By setting two first bolts that are threadedly connected to the screw of the blocking component, and placing the two first bolts at the two ends of the positioning plate respectively, the user can fix the blocking component by tightening the two first bolts and using the huge preload between the first bolts. This reduces the probability of the blocking component shifting when it is impacted and improves the stability of the test fixture.

[0033] Optionally, the blocking member further includes a second bolt, the baffle includes a connecting groove, and the screw includes:

[0034] The main body is movably connected to the positioning plate, and the first bolt is disposed on the main body; and,

[0035] A protrusion is connected to one end of the main body facing the baffle, and the protrusion is fixedly connected to the connecting groove;

[0036] The second bolt is screwed to the main body, and the second bolt abuts against the side of the baffle facing the positioning plate.

[0037] The screw is threaded to the connecting groove on the baffle, achieving the first layer of fixation. Then, the second bolt on the screw abuts against the baffle, forming a strong preload. This ensures a tight surface contact between the baffle, the protrusion, and the second bolt, reducing the probability of the blocking component loosening or separating under the severe impact of the battery under test, and improving the stability of the testing fixture.

[0038] Optionally, the test fixture further includes a pad, which is disposed on the sensor, and the side of the pad facing away from the bearing surface is used to support the battery under test.

[0039] By placing the pad on the sensor's bearing surface, the bearing surface is prevented from being directly impacted by the battery under test, reducing the probability of the sensor deforming or being damaged.

[0040] This invention uses a sensor's bearing surface to support the battery under test. When the heating element induces thermal runaway in the battery under test, the sensor can acquire the pressure data generated by the battery under test on the bearing surface, thereby simulating the impact of lithium battery thermal runaway on the bottom of the battery box. This fills the testing gap in the prior art, provides data support for the safety design of the bottom of the battery system, and improves the comprehensiveness and accuracy of thermal runaway testing.

[0041] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0044] Figure 1 This is a schematic diagram of the structure of the test fixture provided in an exemplary embodiment of this disclosure;

[0045] Figure 2 yes Figure 1 Another structural schematic diagram of the test fixture;

[0046] Figure 3 yes Figure 2 AA cross-sectional view of the test fixture;

[0047] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0048] Figure 5 yes Figure 3 Enlarged diagram of part B.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Testing fixtures;

[0051] 11. Sensor; 111. Bearing surface;

[0052] 12. Heating element;

[0053] 13. Blocking component; 131. Baffle; 132. Screw; 1321. Main body; 1322. Protrusion; 133. Second bolt;

[0054] 14. Limiting component; 141. Limiting hole; 142. Mounting part; 1421. Clearance hole; 143. Limiting part;

[0055] 15. Mounting bracket; 151. Base plate; 152. Support rod; 153. Locking fastener; 1531. Positioning plate; 1532. First bolt;

[0056] 16. Gaskets;

[0057] 2. Battery to be tested. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0059] This application provides a battery testing fixture 1, please refer to [link / reference]. Figures 1 to 4The test fixture 1 includes a sensor 11 and a heating element 12. The sensor 11 includes a bearing surface 111, which is used to support the battery 2 under test. The sensor 11 is used to test the pressure on the bearing surface 111. The heating element 12 is used to heat the battery 2 under test supported on the bearing surface 111.

[0060] The heating element 12 is used to heat the battery under test 2, thereby inducing thermal runaway of the battery under test 2 and simulating the thermal runaway behavior during actual use. The sensor 11 can acquire the pressure data at the bottom of the battery under test 2 when thermal runaway occurs, predict the impact that the bottom of the battery box may suffer, and thus make more targeted improvements to the lithium battery or battery box structure. The sensor 11 can be a pressure sensor 11, used only to acquire pressure data; or it can be a temperature and pressure integrated sensor 11, which tests the impact of thermal runaway on temperature while testing pressure, thus obtaining more comprehensive data.

[0061] This invention uses the bearing surface 111 of the sensor 11 to support the battery under test 2. When the heating element causes thermal runaway of the battery under test 2, the sensor 11 can acquire the pressure data generated by the battery under test 2 on the bearing surface 111, thereby simulating the impact of lithium battery thermal runaway on the bottom of the battery box, filling the testing gap in the prior art, providing data support for the safety design of the bottom of the battery system, and thus improving the comprehensiveness and accuracy of thermal runaway testing.

[0062] In some alternative embodiments, the heating element 12 is bonded to the surface of the battery under test 2. Furthermore, a thermally conductive adhesive is provided between the heating element 12 and the battery under test 2, so that the heat from the heating element 12 can be more evenly directed to the battery under test 2, and heat loss during heat transfer can be reduced.

[0063] In some embodiments, please refer to Figures 1 to 4 The test fixture 1 also includes a blocking member 13, which is positioned toward the bearing surface 111 of the sensor 11 and is configured to be on the movement path of the battery under test 2 when it is in a thermal runaway state.

[0064] Inside the enclosed battery pack, a thermally runaway cell, after impacting the top cover, will rebound under the reaction force of the top cover and crash into the bottom of the battery pack again. This secondary impact can also easily damage the bottom of the battery pack.

[0065] Therefore, in this embodiment of the present invention, by setting the blocking member 13 to simulate the top cover of the battery pack, the battery under test 2 in the thermal runaway state can be blocked, so that the battery under test 2 bounces back onto the bearing surface 111 of the sensor 11, thereby better simulating the real situation and collecting the impact force data of the battery under test 2 hitting the sensor 11 a second time, so as to further improve the thermal runaway test.

[0066] In some embodiments, please refer to Figures 1 to 4 The test fixture 1 also includes a limiting member 14, which is disposed on the sensor 11. The limiting member 14 includes a limiting hole 141, the opening of which faces the blocking member 13. The limiting hole 141 is used to accommodate the battery under test 2 supported by the bearing surface 111.

[0067] By setting a limiting member 14 with a limiting hole 141, and setting the opening of the limiting hole 141 to face the blocking member 13, the movement path of the battery under test 2 is kept within a preset range. This guides the battery under test 2 to impact the blocking member 13 and rebound, ensuring that the battery under test 2 impacts the sensor 11 a second time, thus guaranteeing the repeatability of the thermal runaway test. Furthermore, the limiting block effectively prevents the battery under test 2 from moving laterally during thermal runaway, avoiding it from flying out of the test area, ensuring the safety of the test personnel, and improving the safety during the thermal runaway test process.

[0068] In some embodiments, the limiting hole 141 extends along the bearing surface 111 toward the blocking member 13, and the distance between the blocking member 13 and the end face of the limiting hole 141 is greater than or equal to 5 mm and less than or equal to 70 mm.

[0069] If the distance between the blocking member 13 and the end face of the limiting hole 141 is less than 5mm, this distance is too small, severely limiting the upward movement of the battery under test 2 during thermal runaway. This causes the battery to collide with the blocking member 13 prematurely before it can fully accelerate and release energy. The impact force is suppressed by the extremely short acceleration distance, which cannot accurately reflect the actual situation of the battery under test 2 in practical applications. If the distance between the blocking member 13 and the end face of the limiting hole 141 is greater than 70mm, the battery under test 2 is likely to break through the limiting hole 141, causing the battery under test 2 to be unable to complete the secondary impact on the bearing surface 111.

[0070] Therefore, in this embodiment of the utility model, the distance between the blocking member 13 and the end face of the limiting hole 141 is set to be greater than or equal to 5mm and less than or equal to 70mm. For example, it can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, etc., to reduce the probability of the battery under test 2 punching out of the limiting hole 141, and to better simulate the situation of the battery under test 2 in the battery pack, so as to obtain more accurate data.

[0071] In some embodiments, please refer to Figures 1 to 4 The limiting member 14 includes a mounting part 142 and a limiting part 143. The mounting part 142 is disposed on the sensor 11. The limiting part 143 is connected to the mounting part 142, and at least a portion of the limiting part 143 protrudes from the side of the mounting part 142 facing away from the sensor 11. The limiting part 143 is provided with a limiting hole 141.

[0072] By directly mounting the mounting portion 142 onto the sensor 11, a solid foundation is provided for the limiting member 14, reducing the probability of displacement or loosening of the limiting member 14 during thermal runaway of the battery under test 2, thereby ensuring the stability of the testing device. The limiting portion 143 protruding from the mounting portion 142 can be used to form a limiting hole 141, ensuring that the limiting hole 141 has sufficient depth to install the battery under test 2, achieving a better limiting effect.

[0073] The mounting part 142 and the limiting part 143 can be integrally formed, or they can be connected by welding, snap-fitting, bonding or other methods. This utility model embodiment does not limit this.

[0074] In some embodiments, please refer to Figures 1 to 4 The heating element 12 is disposed within the limiting hole 141, or the heating element 12 is disposed between the limiting element 14 and the sensor 11; the mounting part 142 is provided with a clearance hole 1421, and the test fixture 1 also includes a wire, which passes through the clearance hole 1421 to connect with the heating element 12.

[0075] By providing clearance holes 1421 in the mounting part 142, space is provided for the wires connected to the heating element 12, so that the wires can be neatly passed out from the mounting part 142. This effectively reduces the risk of the wires being squeezed and damaged due to messy arrangement between the limiting member 14 and the sensor 11, ensuring the stability of the power supply to the heating element 12 while maintaining the good compactness of the test fixture 1.

[0076] In some alternative implementations, there are multiple clearance holes 1421, allowing wires to pass through from multiple directions, thereby facilitating wire arrangement and improving the environmental adaptability of the test fixture 1.

[0077] In some embodiments, please refer to Figures 1 to 4 The test fixture 1 also includes a mounting bracket 15, and a blocking member 13 is movably connected to the mounting bracket 15 so that the blocking member 13 can move along the bearing surface 111 toward the blocking member 13.

[0078] By setting up a mounting bracket 15 to support the blocking member 13, and the movable connection between the blocking member 13 and the mounting bracket 15, the operator can flexibly adjust the distance between the blocking member 13 and the battery under test 2 according to different types and sizes of battery packs, thereby accurately simulating the gap between the top cover and the internal cells of various battery packs, expanding the application range of the test fixture 1 in this application embodiment, and improving the accuracy of test data.

[0079] In some embodiments, please refer to Figures 1 to 4The mounting bracket 15 includes a base plate 151 and a support rod 152. The sensor 11 is disposed on the base plate 151. The support rod 152 extends along the bearing surface 111 toward the blocking member 13 and is disposed on the base plate 151. The blocking member 13 is movably connected to the support rod 152.

[0080] By setting the base plate 151, a stable and reliable bearing platform is provided for the entire test fixture 1, eliminating the need to install the sensor 11 in other specific locations and reducing the environmental requirements of the test fixture 1. The support rod 152 provides a precise guide track for the blocking component 13, reducing the probability of the blocking component 13 deviating and improving the accuracy of the test results.

[0081] There are several ways in which the blocking member 13 and the support rod 152 can be movably connected. For example, the support rod 152 can be inserted through the end of the blocking member 13, so that the blocking member 13 can slide on the support rod 152; or a slide rail can be provided on the support rod 152, and a corresponding slider can be provided on the blocking member 13, so that the blocking member 13 and the support rod 152 can be movably connected by the slider sliding on the slide rail.

[0082] In some embodiments, please refer to Figures 1 to 4 The mounting bracket 15 also includes a locking element 153, which is connected to the support rod 152 and the blocking member 13 respectively, for locking or unlocking the relative position of the blocking member 13 and the support rod 152.

[0083] By setting a locking fastener 153 connecting the support rod 152 and the blocking member 13, the blocking member 13 can be fixed by the locking fastener 153 when it is adjusted to a suitable position, reducing the probability of the blocking member 13 shaking or shifting when it is hit by the battery under test 2, facilitating multiple tests and improving the stability of the test fixture 1.

[0084] The locking fastener 153 can be a bolt threaded onto the blocking member 13. By rotating the bolt until it abuts against the support rod 152, the relative fixation between the blocking member 13 and the support rod 152 can be achieved. Alternatively, the locking fastener 153 can be a pin that passes through the blocking member 13, and the support rod 152 has multiple holes spaced apart. The relative fixation between the blocking member 13 and the support rod 152 can be achieved by the cooperation of the pin and the holes.

[0085] In some embodiments, please refer to Figures 1 to 5The blocking member 13 includes a baffle 131 and a screw 132. The screw 132 is connected to the side of the baffle 131 away from the bottom plate 151. The locking member 153 includes a positioning plate 1531 and a plurality of first bolts 1532. The positioning plate 1531 is connected to the end of the support rod 152 away from the bottom plate 151. The screw 132 passes through the positioning plate 1531 and is movably connected to the positioning plate 1531. The plurality of first bolts 1532 are threadedly connected to the screw 132 respectively, and at least one first bolt 1532 is provided on the side of the positioning plate 1531 facing the baffle 131, and at least one first bolt 1532 is provided on the side of the positioning plate 1531 away from the baffle 131.

[0086] Specifically, after the blocking member 13 moves to the appropriate position, firstly, the first bolt 1532 on the side of the positioning plate 1531 facing the baffle 131 is turned so that the first bolt 1532 abuts against the positioning plate 1531. Then, the first bolt 1532 on the side of the positioning plate 1531 facing away from the baffle 131 is turned so that the first bolt 1532 also abuts against the positioning plate 1531. The blocking member 13 can be fixed by the interaction force between the two first bolts 1532. Furthermore, the size of the controllable screw 132 is slightly smaller than that of the positioning plate 1531.

[0087] By setting two first bolts 1532 threadedly connected to the screw 132 of the blocking member 13, and positioning the two first bolts 1532 at opposite ends of the positioning plate 1531, the user can fix the blocking member 13 through the large preload between the two first bolts 1532 by tightening them. This reduces the probability of the blocking member 13 shifting when impacted, thus improving the stability of the test fixture 1. Furthermore, the threaded connection between the first bolts 1532 and the screw 132 allows for fine-tuning of the screw 132's position, resulting in more accurate test data.

[0088] In some embodiments, please refer to Figures 1 to 5 The blocking member 13 also includes a second bolt 133, the baffle 131 includes a connecting groove, the screw 132 includes a main body 1321 and a protrusion 1322, the main body 1321 is movably connected to the positioning plate 1531, the first bolt 1532 is disposed on the main body 1321; the protrusion 1322 is connected to one end of the main body 1321 facing the baffle 131, and the protrusion 1322 is fixedly connected to the connecting groove; wherein, the second bolt 133 is screwed to the main body 1321, and the second bolt 133 abuts against the side of the baffle 131 facing the positioning plate 1531.

[0089] The first layer of fixation is achieved by threading the protrusion 1322 on the screw 132 to the connecting groove on the baffle 131. Then, the second bolt 133 on the screw 132 abuts against the baffle 131, forming a strong pre-tightening force. This results in a tight surface contact between the baffle 131, the protrusion 1322, and the second bolt 133, reducing the probability that the blocking component 13 may loosen or separate under the severe impact of the battery 2 under test, and improving the stability of the test fixture 1.

[0090] In some embodiments, please refer to Figures 1 to 5 The test fixture 1 also includes a pad 16, which is disposed on the sensor 11. The side of the pad 16 facing away from the bearing surface 111 is used to support the battery 2 under test.

[0091] By placing the pad 16 on the bearing surface 111 of the sensor 11, the bearing surface 111 is prevented from receiving direct impact from the battery 2 under test, thereby reducing the probability of deformation or damage to the sensor 11.

[0092] In some alternative embodiments, the gasket 16 is made of hard materials such as stainless steel or titanium alloy, thereby improving the protection of the sensor 11 by the gasket 16, preventing corrosion, and reducing the impact force generated by the gasket 16 on the battery under test 2, thus ensuring the accuracy of the test.

[0093] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery testing fixture (1), characterized in that, include: Sensor (11), the sensor (11) including a bearing surface (111) for bearing the battery (2) under test, the sensor (11) for testing the pressure on the bearing surface (111); and, A heating element (12) is used to heat the battery under test (2) supported on the bearing surface (111).

2. The test fixture (1) according to claim 1, characterized in that, The test fixture (1) also includes a blocking member (13) which is disposed toward the bearing surface (111) of the sensor (11) and is configured to be on the movement path of the battery under test (2) in a thermal runaway state.

3. The test fixture (1) according to claim 2, characterized in that, The test fixture (1) also includes a limiting member (14), which is disposed on the sensor (11); The limiting member (14) includes a limiting hole (141), the opening of which faces the blocking member (13), and the limiting hole (141) is used to accommodate the battery under test (2) supported by the bearing surface (111).

4. The test fixture (1) according to claim 3, characterized in that, The limiting hole (141) extends along the bearing surface (111) toward the blocking member (13), and the distance between the end face of the blocking member (13) and the limiting hole (141) is greater than or equal to 5 mm and less than or equal to 70 mm.

5. The test fixture (1) according to claim 3, characterized in that, The limiting member (14) includes: Mounting part (142), said mounting part (142) is disposed on the sensor (11); and, A limiting part (143) is connected to the mounting part (142), and at least a portion of the limiting part (143) protrudes from the mounting part (142) on the side facing away from the sensor (11), and the limiting part (143) is provided with the limiting hole (141).

6. The test fixture (1) according to claim 5, characterized in that, The heating element (12) is disposed in the limiting hole (141), or the heating element (12) is disposed between the limiting element (14) and the sensor (11); The mounting part (142) is provided with a clearance hole (1421), which is connected to the limiting hole (141). The test fixture (1) also includes a wire, which passes through the clearance hole (1421) to connect with the heating element (12).

7. The test fixture (1) according to any one of claims 2 to 6, characterized in that, The test fixture (1) also includes a mounting frame (15), and the blocking member (13) is movably connected to the mounting frame (15) so that the blocking member (13) can move along the bearing surface (111) toward the blocking member (13).

8. The test fixture (1) according to claim 7, characterized in that, The mounting bracket (15) includes: Base plate (151), the sensor (11) is disposed on the base plate (151); and, A support rod (152) is provided on the base plate (151) extending along the bearing surface (111) toward the blocking member (13), and the blocking member (13) is movably connected to the support rod (152).

9. The test fixture (1) according to claim 8, characterized in that, The mounting bracket (15) further includes a locking device (153) that connects the support rod (152) and the blocking member (13) to lock or unlock the relative position of the blocking member (13) and the support rod (152).

10. The test fixture (1) according to claim 9, characterized in that, The blocking member (13) includes a baffle (131) and a screw (132), the screw (132) being connected to the side of the baffle (131) facing away from the base plate (151), and the locking member (153) including: A positioning plate (1531) is connected to one end of the support rod (152) away from the base plate (151), and a screw (132) passes through the positioning plate (1531) and is movably connected to it; and, A plurality of first bolts (1532) are threadedly connected to the screw (132), and at least one first bolt (1532) is disposed on the side of the positioning plate (1531) facing the baffle (131), and at least one first bolt (1532) is disposed on the side of the positioning plate (1531) facing away from the baffle (131).

11. The test fixture (1) according to claim 10, characterized in that, The blocking member (13) further includes a second bolt (133), the baffle (131) includes a connecting groove, and the screw (132) includes: The main body (1321) is movably connected to the positioning plate (1531), and the first bolt (1532) is disposed on the main body (1321); and, A protrusion (1322) is connected to one end of the main body (1321) facing the baffle (131), and the protrusion (1322) is fixedly connected to the connecting groove; The second bolt (133) is screwed to the main body (1321), and the second bolt (133) abuts against the side of the baffle (131) facing the positioning plate (1531).

12. The test fixture (1) according to any one of claims 1 to 6, characterized in that, The test fixture (1) also includes a pad (16), which is disposed on the sensor (11). The side of the pad (16) facing away from the bearing surface (111) is used to support the battery (2) under test.

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