Device, system and method for measuring thermal runaway jet impact force of battery

Abstract

The embodiment of the invention provides a measuring device, a measuring system and a measuring method for thermal runaway jet impact force of a battery. Wherein the measuring device comprises a mounting platform, a baffle plate, a positioning piece and a sensor, and the mounting platform is provided with a plurality of limiting rods extending along a first direction; the baffle movably sleeves the limiting rod, the mounting platform forms a placement space on one side of the baffle in the first direction, and the central axis of the baffle in the thickness direction of the baffle coincides with the central axis of a pressure release valve of the battery; the number of the positioning pieces is multiple, the multiple positioning pieces are arranged on the limiting rod, and the baffles abut against the positioning pieces; and the sensor is arranged on the baffle and is used for measuring a vector value after the baffle is impacted by the pressure release valve. And the problem that the test precision of the jet impact force is influenced by deflection of the baffle plate in the jet process can be avoided. Therefore, according to the measuring device provided by the embodiment of the invention, the testing accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to a measuring device for the jet impact force of battery thermal runaway, a measuring system having the measuring device, and a measuring method thereof. Background Art

[0002] When a lithium-ion battery undergoes thermal runaway, a large amount of combustible gases such as carbon monoxide, hydrocarbons, and hydrogen are generated inside, which can easily cause the battery to catch fire and explode, resulting in safety accidents in new energy vehicles and energy storage power stations and endangering the safety of the general public. In order to reduce the risk of fire and explosion caused by battery thermal runaway, a pressure relief valve device is usually provided on the battery housing. So that when the lithium-ion battery undergoes thermal runaway and the internal pressure increases to the critical pressure, the pressure relief is automatically activated to prevent the problem of explosion caused by excessive pressure in the battery. However, when the battery goes out of control and ejects, it is very easy for the ejected high-temperature and high-pressure gas and flame to cause adjacent or opposite batteries to undergo thermal runaway, triggering thermal diffusion of the entire battery system or energy storage system. The space inside the battery module becomes smaller and smaller. When the jet impact force is too large and the internal space of the housing is too small, it will further trigger an explosion problem. Therefore, determining the ejection pressure generated during the ejection process of different batteries is of guiding significance for the prevention and control of battery thermal runaway in terms of the set size and position of the pressure relief valve.

[0003] In the related art, a test platform places a baffle at a preset height h above the battery to be measured, and uses a suspension bracket as a support structure to support the baffle; according to the real-time measurement value of the tensile sensor, the minimum value Fmin of the support force of the support structure on the baffle can be obtained. However, this method is prone to eccentricity during the spraying process, affecting the accuracy of force measurement. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an embodiment of the present invention provides a measuring device for the jet impact force of battery thermal runaway. This measuring device has the advantage of improving the accuracy of the test.

[0005] An embodiment of the present invention further provides a measuring system for measuring the jet impact force of battery thermal runaway.

[0006] An embodiment of the present invention further provides a measuring method for measuring the jet impact force of battery thermal runaway.

[0007] The measuring device for the jet impact force of battery thermal runaway in the embodiment of the present invention includes a mounting platform, a baffle, a positioning member, and a sensor.

[0008] The mounting platform has a plurality of limiting rods extending in a first direction; the baffle is movably sleeved on the plurality of limiting rods along the first direction, and the mounting platform forms a placement space for placing the battery to be tested on one side of the baffle along the first direction. The central axis of the baffle along its thickness direction coincides with the central axis of the pressure relief valve of the battery; there are a plurality of positioning members, and the plurality of positioning members are arranged on the plurality of limiting rods, and the baffle abuts against the positioning members; the sensor is arranged on the baffle, and the sensor is used to measure the vector value after the baffle is impacted by the pressure relief valve. It can be understood that the plurality of limiting rods are arranged in parallel and spaced apart along the first direction.

[0009] In the measuring device for the jet impact force during battery thermal runaway according to the embodiment of the present invention, by sleeving the baffle on the limiting rod and making the central axis of the baffle along its thickness direction coincide with the central axis of the pressure relief valve of the battery, it is possible to avoid the problem that the baffle is deflected during the jet impact force impacting the baffle, which affects the test accuracy of the jet impact force. Furthermore, the measuring device for the jet impact force during battery thermal runaway according to the embodiment of the present invention improves the test accuracy.

[0010] Therefore, the measuring device for the jet impact force during battery thermal runaway according to the embodiment of the present invention improves the test accuracy.

[0011] In some embodiments, the baffle includes a baffle body and a plurality of linear bearings, and the plurality of linear bearings are sleeved on the corresponding limiting rods one by one.

[0012] In some embodiments, the linear bearing includes a cylinder body and a plurality of balls, and the plurality of balls are arranged on the inner peripheral wall of the cylinder body at intervals along the circumferential direction of the cylinder body, and the plurality of balls are in rolling cooperation with the limiting rod.

[0013] In some embodiments, the measuring device for the jet impact force during battery thermal runaway further includes a first limiting member. The mounting platform includes a positioning bottom plate and a plurality of the limiting rods inserted into the bottom plate. The limiting rod has a first end and a second end oppositely arranged along the first direction. The first end is connected to the positioning bottom plate, and the first limiting member is arranged on the second end of the limiting rod.

[0014] In some embodiments, the measuring device for the jet impact force during battery thermal runaway further includes an extension section. At least one end of the limiting rod is provided with an extension connection portion, and the extension section is detachably connected to the extension connection portion.

[0015] In some embodiments, the positioning member is movably arranged on the limiting rod.

[0016] In some embodiments, the positioning member includes an adjusting nut, the limiting rod has a threaded section, the positioning nut is in threaded engagement with the threaded section, and the linear bearing is in clearance fit with the threaded section.

[0017] In some embodiments, the measuring device for the jet impact force of battery thermal runaway further includes a temperature sensing layer or a temperature sensor, and the temperature sensing layer or the temperature sensor is disposed on a side of the baffle plate close to the pressure relief valve.

[0018] In some embodiments, the sensor is an acceleration sensor, and the sensor is used to measure the acceleration of the baffle plate after being impacted by the pressure relief valve.

[0019] The measuring system for measuring the jet impact force of battery thermal runaway according to an embodiment of the present invention includes a battery and the measuring device according to any one of the above, the battery to be measured is placed in a placement space of the battery to be measured, and the pressure relief valve of the battery to be measured is disposed opposite to the baffle plate along a first direction.

[0020] The method for measuring the jet impact force of battery thermal runaway according to an embodiment of the present invention uses the measuring system described above, and the steps are as follows: placing the baffle plate at a preset height h above the battery to be measured, aligning the central axis of the baffle plate with the central axis of the pressure relief valve of the battery, obtaining the resistance received by the baffle plate when moving along the first direction, heating the battery until the pressure relief valve of the battery opens, according to force balance, obtaining the vector value of the baffle plate when being impacted by the jet impact force through the sensor, and calculating the maximum jet impact force F received by the baffle plate according to the vector value. Description of the Drawings

[0021] Figure 1 is a perspective view of the measuring device for the jet impact force of battery thermal runaway according to an embodiment of the present invention.

[0022] Figure 2 is a front view of the baffle plate according to an embodiment of the present invention.

[0023] Figure 3 is a perspective view of the limiting rod according to an embodiment of the present invention.

[0024] Figure 4 is a schematic diagram of acceleration measurement during the thermal runaway jet injection process of the battery according to an embodiment of the present invention.

[0025] Reference Signs:

[0026] Measuring device 100; Battery to be measured 200;

[0027] Installation platform 1; Positioning bottom plate 11; Limiting rod 12; Extended connecting portion 121;

[0028] Baffle 2; baffle body 21; linear bearing 22;

[0029] Positioning member 3;

[0030] Sensor 4;

[0031] First limiting member 5; temperature sensing layer 6. Specific embodiments

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0033] Reference will be made below to Figures 1-3 Describe the measuring device 100, measuring system and measuring method for the jet impact force of battery thermal runaway in the embodiments of the present invention.

[0034] The measuring device 100 for the jet impact force of battery thermal runaway in the embodiments of the present invention includes a mounting platform 1, a baffle 2, a positioning member 3 and a sensor 4.

[0035] The mounting platform 1 has a plurality of limiting rods 12 extending in a first direction (for example, Figure 1 The up and down direction shown in the figure). The baffle 2 is movably sleeved on the plurality of limiting rods 12 along the first direction. The mounting platform forms a placement space for placing the battery 200 to be measured on one side of the baffle 2 along the first direction. The central axis of the baffle 2 along its thickness direction coincides with the central axis of the pressure relief valve of the battery. There are a plurality of positioning members 3, and the plurality of positioning members 3 are arranged on the plurality of limiting rods 12. The baffle 2 abuts against the positioning members 3. The sensor 4 is arranged on the baffle 2, and the sensor 4 is used to measure the vector value after the baffle 2 is impacted by the pressure relief valve. It can be understood that the plurality of limiting rods 12 are arranged parallel and spaced apart along the first direction.

[0036] For the measuring device 100 for the jet impact force of battery thermal runaway in the embodiments of the present invention, by sleeving the baffle 2 on the limiting rod 12 and making the central axis of the baffle 2 along its thickness direction coincide with the central axis of the pressure relief valve of the battery, it is possible to avoid the problem that the baffle 2 is deflected during the jet impact force impacting the baffle 2, which affects the test accuracy of the jet impact force. Furthermore, the measuring device 100 for the jet impact force of battery thermal runaway in the embodiments of the present invention improves the test accuracy.

[0037] Therefore, the measuring device 100 for the jet impact force of battery thermal runaway in the embodiments of the present invention improves the test accuracy.

[0038] Specifically, the vector value can be the impact force, acceleration, displacement, etc. received by the baffle 2.

[0039] Such as Figure 1As shown, the baffle 2 includes a baffle body 21 and a plurality of linear bearings 22, and the plurality of linear bearings 22 are sleeved on the corresponding limit rods one by one. It can be understood that there are a plurality of linear bearings 22, and the plurality of linear bearings 22 are sleeved on the limit rods 12 one by one correspondingly, and the plurality of linear bearings 22 are all connected to the baffle 2.

[0040] In the measuring device 100 for the jet impact force of battery thermal runaway according to the embodiment of the present invention, by dividing the baffle 2 into a baffle body 21 and a plurality of linear bearings 22, the plurality of linear bearings 22 are slidably sleeved on the limit rods 12 one by one correspondingly. Furthermore, the frictional resistance between the baffle 2 and the limit rods 12 is reduced, so that the influence of the frictional resistance on the test can be reduced. Thus, the measuring device 100 can further improve the accuracy of the test.

[0041] Optionally, there may be four limit rods 12, and the four are arranged in a square or rectangular shape.

[0042] The linear bearing 22 includes a cylinder body and a plurality of balls, and the plurality of balls are arranged on the inner peripheral wall of the cylinder body at intervals along the circumferential direction of the cylinder body, and the plurality of balls are in rolling fit with the limit rods 12.

[0043] In the measuring device 100 for the jet impact force of battery thermal runaway according to the embodiment of the present invention, by including a cylinder body and a plurality of balls in the linear bearing 22 and making the plurality of balls in rolling fit with the limit rods 12, the frictional resistance between the linear bearing 22 and the limit rods 12 during movement can be further reduced. Thus, the measuring device 100 can further improve the accuracy of the test.

[0044] The measuring device 100 for the jet impact force of battery thermal runaway according to the embodiment of the present invention further includes an extension section (not shown). The mounting platform 1 includes a positioning bottom plate 11 and a plurality of limit rods 12 inserted into the bottom plate. At least one end of each limit rod 12 is provided with an extended connection portion 121, and the extension section is detachably connected to the extended connection portion 121.

[0045] In the measuring device 100 for the jet impact force of battery thermal runaway according to the embodiment of the present invention, by providing the extension section, the moving stroke range of the baffle 2 when being impacted can be adjusted. Furthermore, the applicability of the measuring device 100 is improved.

[0046] As Figure 1 As shown, the measuring device 100 for the jet impact force of battery thermal runaway according to the embodiment of the present invention further includes a first limiting member 5. The limit rod 12 has a first end and a second end oppositely arranged along a first direction. The first end is connected to the positioning bottom plate 11, and the first limiting member 5 is arranged on the second end of the limit rod 12.

[0047] The measuring device 100 for the jet impact force of battery thermal runaway in the embodiment of the present invention limits the stroke of the baffle 2 through the first limiting member 5. Thus, the measuring device 100 can prevent the abnormal flying out of the baffle 2 during the spraying process when the baffle 2 is impacted. Furthermore, the measuring device 100 improves the safety of the test process.

[0048] Optionally, the measuring device 100 for the jet impact force of battery thermal runaway in the embodiment of the present invention further includes a second limiting member, and the second limiting member is arranged at one end of the limiting rod 12 opposite to the first limiting member 5. For example, Figure 1 As shown in, the first limiting member 5 can be arranged at the upper end of the limiting rod 12.

[0049] Furthermore, the first limiting member 5 and the second limiting member can be adjusting nuts, and the adjusting nuts are movably arranged at one end of the limiting rod 12.

[0050] As Figure 1 shown, the positioning member 3 is movably arranged on the limiting rod 12. Furthermore, the position of the positioning member 3 can adjust the distance between the baffle 2 and the explosion-proof valve of the battery cell, so as to flexibly adjust the spraying distance, improving the diversity and applicability of the test.

[0051] As Figure 1 shown, the positioning member 3 includes an adjusting nut, the limiting rod 12 has a threaded section, the positioning nut is in threaded cooperation with the threaded section, and the linear bearing 22 is in clearance fit with the threaded section.

[0052] The measuring device 100 for the jet impact force of battery thermal runaway in the embodiment of the present invention threads the adjusting nut with the threaded section of the limiting rod 12. Thus, the measuring device 100 has the advantage of high adjustment convenience. In addition, the setting of the threaded adjustment structure also helps to achieve continuous height adjustment, improving the convenience of using the measuring device 100.

[0053] In addition, the linear bearing 22 is in clearance fit with the threaded section, which can further reduce the influence of frictional resistance on the test. Thus, the measuring device 100 can further improve the accuracy of the test.

[0054] As Figure 2 shown, the measuring device 100 for the jet impact force of battery thermal runaway in the embodiment of the present invention further includes a temperature-sensitive layer 6 or a temperature sensor 4, and the temperature-sensitive layer 6 or the temperature sensor 4 is arranged on one side of the baffle body 21 close to the pressure relief valve.

[0055] The measuring device 100 for the jet impact force of battery thermal runaway according to the embodiments of the present invention can measure the actual jet area through the provided temperature sensing layer 6 or temperature sensor 4, avoiding using the area of the baffle 2 as the jet area of the battery cell thermal runaway during calculation, which has a large difference from the actual situation. Therefore, it is also necessary to know the jet impact force and jet area during the thermal runaway of the battery cell to determine the safety protection design area and design structure. Thus, it helps to further improve the accuracy of the test.

[0056] Optionally, the temperature sensing layer 6 can be a temperature sensing sticker attached to the baffle body 21, and the measurement of the actual jet area is achieved by pasting the temperature sensing sticker.

[0057] The sensor 4 is an acceleration sensor 4. Thus, the measuring device 100 can directly measure the acceleration curve of the movement of the baffle 2, and calculating the impact force from the acceleration has the advantage of high accuracy.

[0058] The measuring system for measuring the jet impact force of battery thermal runaway according to the embodiments of the present invention includes a battery under test 200 and a measuring device 100 according to any one of the above. The battery under test 200 is placed in the placement space of the battery under test 200, and the pressure relief valve of the battery under test 200 is arranged opposite to the baffle 2 in the first direction.

[0059] Therefore, the measuring system for the jet impact force of battery thermal runaway according to the embodiments of the present invention improves the accuracy of the test.

[0060] The measuring method for measuring the jet impact force of battery thermal runaway according to the embodiments of the present invention is as follows: using the measuring system described above, the steps are as follows: placing the baffle 2 at a preset height h above the battery to be measured, aligning the central axis of the baffle 2 with the central axis of the pressure relief valve of the battery, obtaining the resistance received by the baffle 2 during the movement in the first direction, heating the battery until the pressure relief valve of the battery opens, and according to the force balance, obtaining the vector value of the baffle 2 under the jet impact force through the sensor 4, and calculating the maximum jet impact force F received by the baffle 2 according to the vector value. Therefore, the measuring method for the jet impact force of battery thermal runaway according to the embodiments of the present invention improves the accuracy of the test.

[0061] Furthermore, for the measuring method for measuring the jet impact force of battery thermal runaway according to the embodiments of the present invention, obtaining the actual mass M of the baffle 2 and the mass M1 of the sensor 4, placing the baffle 2 at a preset height h above the battery to be measured, aligning the central axis of the baffle 2 with the central axis of the pressure relief valve of the battery; heating the battery until the pressure relief valve of the battery opens and generating a jet generation step of the battery thermal runaway jet, calculating the acceleration a of the maximum jet impact force F received by the baffle 2, and calculating the jet impact force F according to the acceleration a, where F=(M + M1)(a + g). The schematic diagram of the measured acceleration is as Figure 4 shown.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0064] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or in communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0066] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A measuring device for the jet impact force of battery thermal runaway, characterized in that, Comprising: An installation platform having a plurality of limiting rods extending in a first direction; A baffle movably sleeved on the plurality of limiting rods along the first direction, and a placement space is formed on one side of the installation platform along the first direction of the baffle; Positioning members, there are a plurality of the positioning members, the plurality of positioning members are arranged on the plurality of limiting rods, and the baffle abuts against the positioning members; and A sensor arranged on the baffle, and the sensor is used for measuring the vector value after the baffle is impacted by a pressure relief valve.

2. The measuring device for the jet impact force of battery thermal runaway according to claim 1, wherein The baffle includes a baffle body and a plurality of linear bearings, and the plurality of linear bearings are sleeved on the corresponding limiting rods one by one.

3. The measuring device for the jet impact force of battery thermal runaway according to claim 2, wherein The linear bearing includes a cylinder body and a plurality of balls, and the plurality of balls are arranged on the inner peripheral wall of the cylinder body at intervals along the circumferential direction of the cylinder body, and the plurality of balls are in rolling fit with the limiting rod.

4. The measuring device for the jet impact force of battery thermal runaway according to claim 1, wherein It further includes a first limiting member, the installation platform includes a positioning bottom plate and a plurality of the limiting rods inserted on the bottom plate, the limiting rods have a first end and a second end arranged oppositely along the first direction, the first end is connected to the positioning bottom plate, and the first limiting member is arranged on the second end of the limiting rod.

5. The measuring device for the jet impact force of battery thermal runaway according to claim 4, characterized in that, It further includes an extension section, at least one end of the limiting rod is provided with an extended connecting portion, and the extension section is detachably connected to the extended connecting portion.

6. The measuring device for the jet impact force of battery thermal runaway according to claim 2, wherein The positioning member is movably arranged on the limiting rod.

7. The measuring device for the jet impact force of battery thermal runaway according to claim 6, characterized in that, The positioning member includes an adjusting nut, the limiting rod has a threaded section, the positioning nut is in threaded fit with the threaded section, and the linear bearing is in clearance fit with the threaded section.

8. The measuring device for the jet impact force of battery thermal runaway according to claim 1, characterized in that, It further includes a temperature sensing layer or a temperature sensor, and the temperature sensing layer or the temperature sensor is arranged on the side of the baffle close to the pressure relief valve; And / or, the sensor is an acceleration sensor, and the sensor is used for measuring the acceleration of the baffle after being impacted by the pressure relief valve.

9. A measurement system for measuring the impact force of a battery thermal runaway jet, characterized in that Comprising a battery and the measuring device according to any one of claims 1-8, the battery to be measured is placed in the placement space, and the pressure relief valve of the battery to be measured is arranged oppositely to the baffle along the first direction.

10. A measurement method for measuring the impact force of the jet during battery thermal runaway, characterized in that, Using the measuring system according to claim 9, the steps are as follows: Place the baffle at a preset height h above the battery to be measured, align the central axis of the baffle with the central axis of the pressure relief valve of the battery, obtain the resistance suffered by the baffle when moving along the first direction, heat the battery until the pressure relief valve of the battery opens, according to force balance, obtain the vector value of the baffle when being impacted by the jet impact force according to the sensor, and calculate the maximum jet impact force F suffered by the baffle according to the vector value.

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