Measuring device

Abstract

The utility model provides a measuring device. The measuring device comprises a fixing assembly, a first measuring assembly and a second measuring assembly. The first measuring assembly is arranged on the fixing assembly, the first measuring assembly and a partial area of the fixing assembly are arranged at an interval, so that a battery cell mounting space is formed at the interval, the battery cell mounting space is used for mounting a to-be-measured battery cell, and the first measuring assembly is attached to the large surface of the to-be-measured battery cell so as to be used for measuring the shell expansion force of the to-be-measured battery cell. The second measuring assembly is arranged on the fixing assembly and located on one side, in the first direction, of the battery cell mounting space, and the second measuring assembly and the to-be-measured battery cell are arranged in a spaced mode so as to be used for measuring the thermal runaway impact force of the to-be-measured battery cell; wherein the interval direction between the first measuring assembly and the fixing assembly is a second direction, and the first direction is perpendicular to the second direction. The measuring device not only can measure the change of the air pressure in the shell in the thermal runaway process of the to-be-measured cell, but also can measure the change of the thermal runaway impact force of the to-be-measured cell, so that the measurement is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to battery technology, in particular to a measuring device. BACKGROUND

[0002] Lithium-ion batteries can cause continuous accumulation of heat inside the battery under abnormal conditions, abnormal temperature rise, and then trigger the positive and negative electrodes to heat themselves inside the battery, or directly short circuit, heat cannot be dispersed, and eventually may cause the battery to catch fire or even explode, i.e. battery thermal runaway.

[0003] Battery thermal runaway can cause the internal pressure of the battery to rise, and the explosion-proof valve to burst and spray fire. In related technologies, by testing the internal pressure change of the battery during thermal runaway, it is helpful to evaluate the safety performance of the battery and predict the possible dangers of the battery under abnormal conditions, such as fire or explosion. And by testing the fire impact force of the battery during thermal runaway, it provides a scientific basis for the safety protection of the battery pack cover of the electric vehicle, further improves the safety and reliability of the electric vehicle, and realizes green travel and sustainable development.

[0004] However, in related technologies, the measurement of the internal pressure and the fire impact force during the battery thermal runaway process is troublesome, and it is difficult to simultaneously measure the internal pressure and the fire impact force during the battery thermal runaway process. UTILITY MODEL CONTENT

[0005] The embodiment of the present application provides a measuring device which is convenient to measure.

[0006] The technical scheme of the embodiment of the present application is as follows:

[0007] The embodiment of the present application provides a measuring device, which comprises:

[0008] A fixing assembly;

[0009] A first measuring assembly is arranged on the fixing assembly and is arranged in a spaced manner with a part of the fixing assembly, so that an interval forms a battery cell mounting space, the battery cell mounting space is used for mounting a battery cell to be measured, and the first measuring assembly is attached to a large surface of the battery cell to be measured, so as to measure the shell expansion force of the battery cell to be measured.

[0010] A second measuring assembly is arranged on the fixing assembly and is located on one side of the battery cell mounting space along a first direction, and the second measuring assembly is arranged in a spaced manner with the battery cell to be measured, so as to measure the thermal runaway impact force of the battery cell to be measured; wherein the spacing direction between the first measuring assembly and the fixing assembly is a second direction, and the first direction is perpendicular to the second direction.

[0011] In one embodiment, the second measuring assembly comprises a fireproof member and a first force sensor, the fireproof member is arranged to be spaced apart from the battery under test, and the first force sensor is arranged on the fixing assembly and located on a side of the fireproof member away from the battery mounting space.

[0012] In one embodiment, the fireproof member comprises a test baffle, the test baffle is located on a side of the first force sensor close to the battery mounting space and is attached to the first force sensor; and / or,

[0013] The fireproof member comprises a fireproof cover, at least part of the fireproof cover extends around the circumference of the first force sensor to enclose a fireproof space, and the first force sensor is located in the fireproof space.

[0014] In one embodiment, the fixing assembly comprises a battery fixing plate and a sensor fixing plate, the battery fixing plate and the sensor fixing plate are arranged to be spaced apart and fixed relative to each other along the first direction, the battery mounting space is located at the space between the battery fixing plate and the sensor fixing plate, the second measuring assembly is located on a side of the battery mounting space close to the sensor fixing plate, and the first force sensor is mounted on the sensor fixing plate.

[0015] In one embodiment, part of the sensor fixing plate is through-penetrated to form a through-hole, the second measuring assembly further comprises a fixing rod and a fastener, the fixing rod has a first end and a second end, the first end is connected to the first force sensor, the second end passes through the through-hole and extends to a side of the sensor fixing plate away from the first force sensor, the fastener has a size greater than the opening size of the through-hole, and the fastener is sleeved on the second end to fasten the fixing rod and the sensor fixing plate.

[0016] In one embodiment, the second measuring assembly further comprises a fixing sleeve, opposite ends of the fixing sleeve are connected to the fixing rod and the first force sensor respectively, the fixing sleeve is located on a side of the sensor fixing plate close to the first force sensor, the fixing sleeve has a size greater than the opening size of the through-hole, and the fixing sleeve cooperates with the fastener to limit the movement of the fixing rod and the first force sensor.

[0017] In one embodiment, the first measuring assembly comprises a force transmission member and a second force sensor, one end of the force transmission member is arranged to be spaced apart from part of the fixing assembly to form the battery mounting space therebetween, and the second force sensor is located at the other end of the force transmission member and arranged on the fixing assembly to measure the shell expansion force of the battery under test.

[0018] In one embodiment, the fixing assembly comprises a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are spaced apart and fixed relative to each other along the second direction, the second force sensor is arranged on the second clamping plate and located on a side of the second clamping plate close to the first clamping plate, and the force transmission member is arranged between the first clamping plate and the second force sensor.

[0019] In one embodiment, the force transmission member comprises a third clamping plate and a force transmission rod, one end of the force transmission rod is in abutment with the second force sensor, the third clamping plate is arranged at an end of the force transmission rod away from the second force sensor, and the third clamping plate is spaced apart from the first clamping plate to form the cell mounting space.

[0020] In one embodiment, the fixing assembly further comprises a guide rail seat and a bearing, the guide rail seat is connected to at least one of the first clamping plate and the second clamping plate, the bearing is arranged on the guide rail seat, and the force transmission rod is slidably arranged in the bearing.

[0021] The embodiments of the present application have the following beneficial effects:

[0022] The embodiments of the present application provide a measuring device, which comprises a fixing assembly, a first measuring assembly and a second measuring assembly. The first measuring assembly is arranged on the fixing assembly and spaced apart from a part of the fixing assembly to form a cell mounting space at the spacing, the cell mounting space is used for mounting a to-be-measured cell, and the first measuring assembly is attached to a large surface of the to-be-measured cell to measure the shell expansion force of the to-be-measured cell. The second measuring assembly is arranged on the fixing assembly and located on one side of the cell mounting space along a first direction, and the second measuring assembly is spaced apart from the to-be-measured cell to measure the thermal runaway impact force of the to-be-measured cell. Thus, during the thermal runaway test of the cell, since the first measuring assembly is attached to the large surface of the to-be-measured cell, the first measuring assembly can better measure the shell expansion force of the to-be-measured cell caused by the gas generated due to thermal runaway, and thus can better measure the internal pressure change of the to-be-measured cell during thermal runaway. In addition, the second measuring assembly can be spaced apart from the to-be-measured cell in another direction, so as to better measure the thermal runaway impact force of the to-be-measured cell caused by the fire generated due to thermal runaway. It can be seen that, by using the measuring device of the present application, not only the internal gas pressure change of the to-be-measured cell during thermal runaway can be measured, but also the thermal runaway impact force change of the to-be-measured cell can be measured, so that the measurement is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of a measuring device provided by an embodiment of the present application;

[0024] Figure 2 is Figure 1A schematic diagram of the structure of the second measuring component is shown in the figure; fasteners are not shown.

[0025] Figure 3 for Figure 1 A magnified view of point A from another perspective.

[0026] Explanation of reference numerals in the attached figures

[0027] 10. Fixing component; 11. Cell fixing plate; 12. Sensor fixing plate; 12a. Through hole; 13. First clamping plate; 14. Second clamping plate; 15. Guide rail seat; 16. Bearing; 20. First measuring component; 20a. Cell mounting space; 21. Force transmission component; 211. Third clamping plate; 212. Force transmission rod; 22. Second force sensor; 30. Second measuring component; 31. Fireproof component; 311. Test baffle; 312. Fireproof cover; 312a. Fireproof space; 32. First force sensor; 33. Fixing rod; 331. First end; 332. Second end; 34. Fixing sleeve; 40. Cell under test. Detailed Implementation

[0028] In this application, the orientation or positional relationship of "first direction" and "second direction" is based on the appendix. Figure 1 The orientation or positional relationship shown is for illustrative purposes only and is not intended to 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, it should not be construed as a limitation of this application.

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0031] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application.

[0032] One embodiment of this application provides a measuring device; please refer to [link / reference]. Figure 1The measuring device comprises a fixing assembly 10, a first measuring assembly 20 and a second measuring assembly 30.

[0033] The first measuring assembly 20 is arranged on the fixing assembly 10 and is spaced apart from a part of the fixing assembly 10 to form an electrode assembly mounting space 20a for mounting the battery electrode assembly 40 to be measured, and the first measuring assembly 20 is attached to a large surface of the battery electrode assembly 40 to be measured for measuring the shell expansion force of the battery electrode assembly 40 to be measured.

[0034] The second measuring assembly 30 is arranged on the fixing assembly 10 and is located on one side of the electrode assembly mounting space 20a along a first direction, and the second measuring assembly 30 is spaced apart from the battery electrode assembly 40 to be measured for measuring the thermal runaway impact force of the battery electrode assembly 40 to be measured; wherein the spacing direction between the first measuring assembly 20 and the fixing assembly 10 is a second direction, and the first direction is perpendicular to the second direction.

[0035] Specifically, the measuring device is used for measuring the battery electrode assembly, which can measure the shell expansion force of the battery electrode assembly 40 to be measured during the thermal runaway process to measure the internal gas pressure of the battery electrode assembly 40 to be measured, and can measure the impact force change of the battery electrode assembly 40 to be measured during the thermal runaway process.

[0036] The fixing assembly 10 can be used to fix the first measuring assembly 20 and the second fixing assembly 10.

[0037] The first measuring assembly 20 is used to measure the shell expansion force of the battery electrode assembly 40 to be measured during the thermal runaway process. The electrode assembly mounting space 20a is formed by the first measuring assembly 20 and a part of the fixing assembly 10 to mount and fix the battery electrode assembly 40 to be measured.

[0038] In fact, during the thermal runaway process, the large surface side of the battery electrode assembly 40 to be measured expands under the action of the internal gas pressure, and the side surface side of the battery electrode assembly 40 to be measured is thermal runaway and spouts fire, thereby forming a thermal runaway impact force on the battery shell. Therefore, the first measuring assembly 20 is attached to the large surface of the battery electrode assembly 40 to be measured to facilitate the measurement of the internal gas pressure of the battery electrode assembly 40 to be measured. The second measuring assembly 30 is arranged on the other side (i.e. the side surface side) of the electrode assembly mounting space 20a, which can facilitate the measurement of the thermal runaway impact force of the battery electrode assembly 40 to be measured.

[0039] The spacing direction between the first measuring assembly 20 and the fixing assembly 10 is a second direction, wherein the second direction is the direction of the large surface side of the battery electrode assembly 40 to be measured.

[0040] The second measuring assembly 30 is located on one side of the electrode assembly mounting space 20a along a first direction, wherein the first direction is the direction of the side surface side of the battery electrode assembly 40 to be measured.

[0041] It should be noted that the second measurement assembly 30 is spaced apart from the battery cell 40 to be measured, and the spacing distance therebetween can be set according to actual requirements. For example, the spacing distance between the second measurement assembly 30 and the battery cell 40 to be measured is the actual spacing between the side surface of the battery cell and the battery shell.

[0042] In the measurement device of the embodiments of the present application, the first measurement assembly 20 is arranged on the fixing assembly 10 and is spaced apart from part of the area of the fixing assembly 10, so that the space formed thereby forms a battery cell mounting space 20a for mounting the battery cell 40 to be measured. The first measurement assembly 20 is attached to the large surface of the battery cell 40 to be measured, so as to measure the shell expansion force of the battery cell 40 to be measured. The second measurement assembly 30 is arranged on the fixing assembly 10 and is located on one side of the battery cell mounting space 20a along the first direction. The second measurement assembly 30 is spaced apart from the battery cell 40 to be measured, so as to measure the thermal runaway impact force of the battery cell 40 to be measured. Thus, during the thermal runaway test of the battery cell, since the first measurement assembly 20 is attached to the large surface of the battery cell 40 to be measured, the first measurement assembly 20 can better measure the shell expansion force formed by the battery cell 40 to be measured due to the gas generated by thermal runaway, and thus can better measure the internal pressure change of the battery cell 40 to be measured during thermal runaway. Moreover, the second measurement assembly 30 can be spaced apart from the battery cell 40 to be measured in another direction, so as to better measure the thermal runaway impact force generated by the battery cell 40 to be measured due to thermal runaway fire. Thus, it can be seen that, by using the measurement device of the present application, not only the internal gas pressure change of the battery cell 40 to be measured during thermal runaway can be measured, but also the change of the thermal runaway impact force of the battery cell 40 to be measured can be measured, so that the measurement can be more convenient.

[0043] In an embodiment, referring to Figure 1 and Figure 2 , the second measurement assembly 30 includes a fireproof member 31 and a first force sensor 32. The fireproof member 31 is spaced apart from the battery cell 40 to be measured, and the first force sensor 32 is arranged on the fixing assembly 10 and is located on the side of the fireproof member 31 away from the battery cell mounting space 20a. Thus, while achieving a good fireproof effect, the thermal runaway impact force can be measured conveniently.

[0044] Specifically, the fireproof member 31 is a structure having a good fireproof effect. It can be partially located between the battery cell 40 to be measured and the first force sensor 32, or all regions thereof can be located between the battery cell 40 to be measured and the first force sensor 32. Thus, the influence of the thermal runaway fire of the battery cell 40 to be measured on the first force sensor 32 can be reduced, so as to ensure the measurement effect of the first force sensor 32 as much as possible.

[0045] In fact, during the thermal runaway of the battery under test 40, the impact force formed by the thermal runaway fire of the battery under test 40 acts on the fireproof part 31, and then is transmitted to the first force sensor 32 through the fireproof part 31. Therefore, the fireproof effect can be achieved, and the thermal runaway impact force can be measured by the first force sensor 32.

[0046] It should be noted that the specific structure of the fireproof part 31 can be set according to the actual situation.

[0047] For example, referring to Figure 1 and Figure 2 , the fireproof part 31 includes a test baffle 311, which is located on the side of the first force sensor 32 close to the battery mounting space 20a and is attached to the first force sensor 32. By setting the test baffle 311, on the one hand, the first force sensor 32 can be attached to facilitate the transmission of the thermal runaway impact force to the first force sensor 32. On the other hand, the first force sensor 32 and the battery under test 40 can be better separated to achieve better fireproof effect.

[0048] It should be noted that the specific size of the test baffle 311 can be set according to the actual situation.

[0049] For example, in the projection plane parallel to the side of the battery under test 40, the projection of the first force sensor 32 is located within the projection range of the test baffle 311. Therefore, the fireproof effect of the test baffle 311 can be further improved.

[0050] For example, the fireproof part 31 includes a fireproof cover 312, at least part of the area of the fireproof cover 312 extends around the circumference of the first force sensor 32 to enclose a fireproof space 312a, and the first force sensor 32 is located in the fireproof space 312a. Therefore, the fireproof effect of the first force sensor 32 in the circumferential direction can be improved.

[0051] Specifically, the fireproof cover 312 can only extend around the circumference of the first force sensor 32 in part of the area to prevent the thermal runaway fire of the battery under test 40 from acting on the first force sensor 32 from the circumferential direction. Of course, the fireproof cover 312 can also extend around the circumference of the first force sensor 32 in all areas.

[0052] It should be noted that regardless of the setting of the fireproof cover 312, the fireproof part 31 will have at least part of the area between the battery under test 40 and the first force sensor 32 to reduce the thermal runaway fire of the battery under test 40 from acting on the first force sensor 32 from the first direction.

[0053] For example, the fireproof part 31 includes both the fireproof cover 312 and the test baffle 311, so that the protection of the first force sensor 32 can be achieved from the circumferential direction and the first direction.

[0054] For example, the fireproof member 31 only includes the fireproof cover 312, and the fireproof space 312a of the fireproof cover 312 only has an opening away from one side of the battery cell mounting space 20a. Thus, the protection of the first force sensor 32 can also be achieved by only the fireproof cover 312.

[0055] The fireproof space 312a is formed by the fireproof cover 312, which is used to accommodate the first force sensor 32.

[0056] It should be noted that in some embodiments, the fireproof space 312a can also be filled with fireproof material to further improve the fireproof effect of the first force sensor 32.

[0057] In an embodiment, referring to Figure 1 The fixing assembly 10 includes a battery cell fixing plate 11 and a sensor fixing plate 12. The battery cell fixing plate 11 and the sensor fixing plate 12 are spaced apart and fixed relative to each other along the first direction. The battery cell mounting space 20a is located at the interval between the battery cell fixing plate 11 and the sensor fixing plate 12. The second measurement assembly 30 is located on the side of the battery cell mounting space 20a close to the sensor fixing plate 12. The first force sensor 32 is installed on the sensor fixing plate 12. Thus, the installation stability of the first force sensor 32 can be improved, thereby facilitating measurement.

[0058] Specifically, the battery cell mounting space 20a is located between the battery cell fixing plate 11 and the sensor fixing plate 12. The battery cell to be measured 40 is placed on the battery cell fixing plate 11.

[0059] The sensor fixing plate 12 is used for installing and fixing the first force sensor 32. The battery cell fixing plate 11 and the sensor fixing plate 12 are respectively located on opposite sides of the battery cell to be measured 40 along the first direction (i.e., the side surface side).

[0060] It should be noted that the specific way in which the battery cell fixing plate 11 and the sensor fixing plate 12 are kept relatively fixed is not limited.

[0061] For example, the fixing assembly 10 includes at least one first support rod. The opposite ends of the first support rod are respectively connected to the battery cell fixing plate 11 and the sensor fixing plate 12, so that the battery cell fixing plate 11 and the sensor fixing plate 12 are relatively fixed. Thus, the relative fixed positional relationship between the two can be maintained.

[0062] That is, the battery cell fixing plate 11 and the sensor fixing plate 12 are connected together by the first support rod. The fixing assembly 10 can be fixedly connected to the battery cell fixing plate 11 and the sensor fixing plate 12 by only one first support rod, or can be fixedly connected to the battery cell fixing plate 11 and the sensor fixing plate 12 by multiple first support rods.

[0063] It should be noted that the connection mode of the first support rod and the cell fixing plate 11 and the connection mode of the sensor fixing plate 12 can be a non-detachable connection mode such as welding to improve the connection stability. Alternatively, a movable connection mode such as clamping and fastening connection can be used to facilitate adjustment of the relative position relationship between the cell fixing plate 11 and the sensor fixing plate 12 before the cell test. In fact, regardless of the connection mode, the cell fixing plate 11 and the sensor fixing plate 12 should be relatively fixed during the cell test.

[0064] In other embodiments, the cell fixing plate 11 and the sensor fixing plate 12 can also not be connected, but only maintain a relative fixed position relationship.

[0065] The mounting mode of the first force sensor 32 on the sensor fixing plate 12 is not limited, as long as it can play the role of fixing the first force sensor 32. Various connection modes such as fastening connection, clamping, and bolting can be used.

[0066] For example, referring to Figure 1 and Figure 2 , a part of the sensor fixing plate 12 is penetrated to form a through hole 12a, and the second measurement assembly 30 further includes a fixing rod 33 and a fastener. The fixing rod 33 has a first end 331 connected with the first force sensor 32 and a second end 332 penetrating through the through hole 12a and extending to the side of the sensor fixing plate 12 away from the first force sensor 32. The fastener has a size larger than the opening size of the through hole 12a, and the fastener is sleeved on the second end 332 to fasten the fixing rod 33 and the sensor fixing plate 12. In this way, the first force sensor 32 can be easily disassembled and installed, and the installation stability of the first force sensor 32 can be improved.

[0067] Specifically, the through hole 12a can be passed through by the fixing rod 33 but not by the first force sensor 32. In this way, the first force sensor 32 can be limited on the side of the sensor fixing plate 12 close to the cell mounting space 20a. At the same time, by arranging the fastener on the side of the sensor fixing plate 12 away from the cell mounting space 20a, the fixing rod 33 is fastened to the sensor fixing plate 12 by the fastener, so that the fixation of the first force sensor 32 can be achieved.

[0068] It should be noted that the specific shape of the through hole 12a is not limited. It can be a circular hole, a strip-shaped hole, etc.

[0069] For example, the through hole 12a includes a first sub-hole and a second sub-hole in communication with each other, wherein the first sub-hole is a strip-shaped hole, and the fixing rod 33 is arranged in the first sub-hole. The second sub-hole is a circular hole for passing the signal transmission line of the first force sensor 32.

[0070] In an embodiment, referring to Figure 1 and Figure 2 The second measuring assembly 30 further comprises a fixing sleeve 34, two opposite ends of the fixing sleeve 34 are connected with the fixing rod 33 and the first force sensor 32 respectively, the fixing sleeve 34 is located on the side of the sensor fixing plate 12 close to the first force sensor 32, the size of the fixing sleeve 34 is greater than the opening size of the through hole 12a, and the fixing sleeve 34 cooperates with the fastener to limit the movement of the fixing rod 33 and the first force sensor 32. In this way, the installation stability of the fixing rod 33 and the first force sensor 32 can be further improved.

[0071] Specifically, the through hole 12a can allow the fixing rod 33 to pass through, but cannot allow the fixing sleeve 34 to pass through. In this way, when the fixing sleeve 34 abuts against the side of the sensor fixing plate 12 close to the first force sensor 32, the fixing sleeve 34 can limit the fixing rod 33 and the first force sensor 32 from moving further away from the side of the battery under test 40. At the same time, the fastener is sleeved on the fixing rod 33 from the side of the sensor fixing plate 12 away from the first force sensor 32, so that the fastener can limit the movement of the fixing rod 33 towards the side close to the battery under test 40. In this way, the fixing sleeve 34 cooperates with the fastener to fix the fixing rod 33 and the first force sensor 32 on the sensor fixing plate 12, thereby further improving the installation stability of the fixing rod 33 and the first force sensor 32.

[0072] In an embodiment, referring to Figure 1 and Figure 3 The first measuring assembly 20 comprises a force transmission member 21 and a second force sensor 22, one end of the force transmission member 21 is arranged in a spaced manner with a part of the fixing assembly 10, so that the space forms a battery mounting space 20a, and the second force sensor 22 is located at the other end of the force transmission member 21 and arranged on the fixing assembly 10, for measuring the shell expansion force of the battery under test 40. In this way, the influence of temperature on the measurement data of the second force sensor 22 can be reduced, and the measurement accuracy can be improved.

[0073] Specifically, when the to-be-tested battery cell 40 generates gas due to thermal runaway, the force transmission member 21 can move towards the side close to the second force sensor 22 to apply a pushing force on the second force sensor 22. The greater the internal pressure during the thermal runaway of the to-be-tested battery cell 40, the greater the pushing force transmitted by the force transmission member 21 to the second force sensor 22, and the greater the value detected by the second force sensor 22. Thus, a better measurement effect can be achieved. Meanwhile, since the second force sensor 22 is not directly attached to the to-be-tested battery cell 40 but is separated from the to-be-tested battery cell 40 by the force transmission member 21 to transmit force, the high-temperature area of the to-be-tested battery cell 40 during thermal runaway can avoid direct contact with the second force sensor 22, thereby reducing the influence of temperature on the measurement data of the second force sensor 22 and avoiding the measurement data drifting with temperature as much as possible, and thus the measurement accuracy can be improved.

[0074] It should be noted that the measurement by the second force sensor 22 can achieve the purpose of real-time monitoring, can timely discover and handle potential safety hazards, and can improve the safety of the battery.

[0075] In an embodiment, referring to Figure 1 and Figure 3 , the fixing assembly 10 includes a first clamping plate 13 and a second clamping plate 14, the first clamping plate 13 and the second clamping plate 14 are spaced apart along the second direction and are relatively fixed, the second force sensor 22 is arranged on the second clamping plate 14 and located on the side of the second clamping plate 14 close to the first clamping plate 13, and the force transmission member 21 is arranged between the first clamping plate 13 and the second force sensor 22. Thus, the installation stability of the second force sensor 22 can be improved.

[0076] It should be noted that the specific manner in which the first clamping plate 13 and the second clamping plate 14 remain relatively fixed is not limited.

[0077] For example, the fixing assembly 10 includes at least one second support rod, opposite ends of the second support rod are connected with the first clamping plate 13 and the second clamping plate 14 respectively, so that the first clamping plate 13 and the second clamping plate 14 are relatively fixed. Thus, the relative fixed positional relationship between the two can be conveniently maintained.

[0078] It should be noted that the connection manner of the second support rod with the first clamping plate 13 and the second clamping plate 14 can be a non-detachable connection manner such as welding, so as to improve the connection stability. Alternatively, a movable connection manner such as clamping and fastening connection can be adopted, so as to adjust the relative positional relationship between the first clamping plate 13 and the second clamping plate 14 before the battery cell is tested. In fact, regardless of the connection manner, the first clamping plate 13 and the second clamping plate 14 should remain relatively fixed during the testing of the battery cell.

[0079] In other embodiments, the first and second clamping plates 13 and 14 can also not be connected, but only maintain a relatively fixed positional relationship.

[0080] In an embodiment, referring to Figure 1 and Figure 3 The force transmission member 21 includes a third clamping plate 211 and a force transmission rod 212, one end of the force transmission rod 212 abuts against the second force sensor 22, and the third clamping plate 211 is arranged at the end of the force transmission rod 212 away from the second force sensor 22, and the third clamping plate 211 is spaced apart from the first clamping plate 13 to form the cell mounting space 20a. Thus, by arranging the third clamping plate 211, the third clamping plate 211 can be conveniently attached to the to-be-tested cell 40, and the change in air pressure in the cell can be better reflected. At the same time, by arranging the force transmission rod 212 to abut against the second force sensor 22, force transmission can be facilitated.

[0081] Specifically, according to the force balance relationship, the following equation is obtained: the reading of the second force sensor 22 = the internal pressure acting area S x the thermal runaway internal pressure p.

[0082] During the cell thermal runaway test, the second force sensor 22 can collect the axial force value of the force transmission rod 212 in real time, and by combining the above equation, the real-time air pressure change in the cell shell during thermal runaway (i.e., the thermal runaway internal pressure p = the reading of the second force sensor 22 / the internal pressure acting area S) can be obtained.

[0083] Therefore, by attaching the third clamping plate 211 to the to-be-tested cell 40, the contact area between the third clamping plate 211 and the to-be-tested cell 40 can be increased, and the test result can be more accurate.

[0084] It should be noted that the specific size of the third clamping plate 211 can be set according to actual conditions.

[0085] For example, the cross-sectional size of the third clamping plate 211 is greater than or equal to the cross-sectional size of the to-be-tested cell 40. That is, the to-be-tested cell 40 is within the coverage range of the third clamping plate 211, and the internal pressure acting area is the size of the large face of the cell shell, thereby further improving the accuracy of the measurement.

[0086] In addition, the connection mode of the third clamping plate 211 and the force transmission rod 212 is not limited.

[0087] For example, the force transmission member 21 further includes a fixing flange arranged on the third clamping plate 211, and one end of the force transmission rod 212 close to the third clamping plate 211 is connected to the fixing flange. Thus, the connection stability of the third clamping plate 211 and the force transmission rod 212 can be improved.

[0088] In an embodiment, referring to Figure 1 and Figure 3The fixing assembly 10 further comprises a guide rail base 15 connected with at least one of the first clamping plate 13 and the second clamping plate 14, and a bearing 16 arranged on the guide rail base 15, and the force transmission rod 212 is slidably arranged in the bearing 16. In this way, the sliding of the force transmission rod 212 can be better guided, and the risk of the force transmission rod 212 being skewed can be reduced.

[0089] Specifically, the guide rail base 15 can be fixedly connected with only the first clamping plate 13, or fixedly connected with only the second clamping plate 14, or fixedly connected with both the first clamping plate 13 and the second clamping plate 14.

[0090] By arranging the bearing 16, the frictional force applied by the guide rail base 15 to the force transmission rod 212 can be reduced, and the measurement accuracy of the second force sensor 22 can be further improved.

[0091] In an embodiment, the fixing assembly 10 comprises at least one second support rod, and opposite ends of the second support rod are connected with the first clamping plate 13 and the second clamping plate 14 respectively, so that the first clamping plate 13 and the second clamping plate 14 are fixed relative to each other.

[0092] The third clamping plate 211 has at least one through hole, and the second support rod is correspondingly arranged in the through hole, so that the third clamping plate 211 is slidably arranged on the second support rod. In this way, by arranging the second support rod, the movement of the third clamping plate 211 can be guided in the thermal runaway test of the battery cell, and the problem that the force transmission rod 212 is bent and skewed due to its own gravity and then causes the test data of the second force sensor 22 to be inaccurate can be avoided as much as possible.

[0093] Specifically, the third clamping plate 211 can have only one through hole, or can have a plurality of through holes, and one second support rod is arranged in each through hole.

[0094] It should be noted that the second support rod is not fixed in the through hole, but can slide relative to the through hole. In this way, the third clamping plate 211 can slide relative to the second support rod. During the thermal runaway test of the battery cell, the second support rod can guide the third clamping plate 211 to slide, so as to transmit the force to the second force sensor 22. At the same time, the second support rod will not greatly affect the force transmission effect of the force transmission member 21, and the accuracy of the measurement data of the second force sensor 22 can be improved.

[0095] In the description of the application, the description of the terms "in an embodiment", "in some embodiments", "in a specific embodiment", or "exemplary" and the like means that the specific feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearance of the above-mentioned terms in various places in the specification is not necessarily intended to refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the different embodiments or examples described in the application and the features of the different embodiments or examples can be combined with each other, if not mutually exclusive.

[0096] The above only describes the preferred embodiments of the application and is not intended to limit the application. The application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application is included in the protection scope of the application.

Claims

1. A measuring device, characterized in that include: Fixed components; A first measuring component is disposed on the fixed component and spaced apart from a portion of the fixed component to form a cell mounting space. The cell mounting space is used to install the cell under test. The first measuring component is in contact with the large surface of the cell under test to measure the shell expansion force of the cell under test. The second measuring component is disposed on the fixed component and located on one side of the cell mounting space along the first direction. The second measuring component is spaced apart from the cell under test to measure the thermal runaway impact force of the cell under test. The first measuring component is spaced apart from the fixed component in the second direction, and the first direction is perpendicular to the second direction.

2. The measuring device of claim 1, wherein, The second measuring component includes a fireproof component and a first force sensor. The fireproof component is spaced apart from the battery cell under test. The first force sensor is mounted on the fixing component and is located on the side of the fireproof component away from the battery cell mounting space.

3. The measuring device of claim 2, wherein, The fireproof component includes a test baffle, which is located on the side of the first force sensor near the cell mounting space and is in contact with the first force sensor; and / or, The fireproof component includes a fireproof cover, at least a portion of which extends circumferentially around the first force sensor to enclose a fireproof space, wherein the first force sensor is located within the fireproof space.

4. The measuring device of claim 2, wherein, The fixing assembly includes a cell fixing plate and a sensor fixing plate. The cell fixing plate and the sensor fixing plate are spaced apart along the first direction and fixed relative to each other. The cell mounting space is located at the interval between the cell fixing plate and the sensor fixing plate. The second measuring assembly is located on the side of the cell mounting space close to the sensor fixing plate. The first force sensor is mounted on the sensor fixing plate.

5. The measuring device of claim 4, wherein, A portion of the sensor mounting plate is penetrated to form a through hole. The second measuring component also includes a fixing rod and a fastener. The fixing rod has a first end and a second end. The first end is connected to the first force sensor. The second end passes through the through hole and extends to the side of the sensor mounting plate opposite to the first force sensor. The fastener is larger than the opening size of the through hole and is fitted onto the second end to securely connect the fixing rod to the sensor mounting plate.

6. The measuring device of claim 5, wherein, The second measuring component further includes a fixing sleeve, the two ends of which are respectively connected to the fixing rod and the first force sensor. The fixing sleeve is located on the side of the sensor fixing plate closer to the first force sensor. The size of the fixing sleeve is larger than the opening size of the through hole. The fixing sleeve cooperates with the fastener to restrict the movement of the fixing rod and the first force sensor.

7. The measuring device according to any one of claims 1 to 6, characterized in that The first measuring assembly comprises a force transmission member and a second force sensor, one end of the force transmission member is arranged in a spaced manner with a partial area of the fixing assembly so that a space is formed between the two for mounting the battery cell, and the second force sensor is arranged on the other end of the force transmission member and on the fixing assembly for measuring the shell expansion force of the battery cell to be measured.

8. The measuring device of claim 7, wherein, The fixing assembly comprises a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are arranged in a spaced manner and fixed oppositely along the second direction, the second force sensor is arranged on the second clamping plate and located on the side of the second clamping plate close to the first clamping plate, and the force transmission member is arranged between the first clamping plate and the second force sensor.

9. The measuring device of claim 8, wherein, The force transmission member comprises a third clamping plate and a force transmission rod, one end of the force transmission rod is in abutment with the second force sensor, the third clamping plate is arranged on the end of the force transmission rod away from the second force sensor, and the third clamping plate is spaced from the first clamping plate to form the battery cell mounting space.

10. The measuring device of claim 9, wherein, The fixing assembly further comprises a guide rail seat and a bearing, the guide rail seat is connected with at least one of the first clamping plate and the second clamping plate, the bearing is arranged on the guide rail seat, and the force transmission rod is slidably arranged in the bearing.

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