Testing device for thermal runaway of battery cell
By designing the setting groove and pressure relief channel of the battery cell thermal runaway test device, using pressure sensors to detect the impact of the battery cell under the recoil force, the problem of inaccurate detection in the prior art is solved, and high-precision battery thermal runaway is achieved test.
Patent Information
- Application Number
- CN202420605991.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The existing thermal runaway test device of the battery cell cannot detect the impact of the battery cell under the action of recoil force, resulting in inaccurate detection results.
A thermal runaway test device for battery cells is designed, including the device base and pressure sensor. The cable is simulated by setting grooves and pressure relief channels to ensure that the pressure sensor can detect the battery cells' rebound force with high accuracy. effect.
It realizes high-precision detection of the impact of the battery cell under the action of recoil force, and improves the authenticity and accuracy of the test results.
Smart Images
Figure CN222280799U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery core thermal runaway testing, in particular to a battery core thermal runaway testing device. Background Art
[0002] In order to improve the safety of battery cells, it is necessary to conduct thermal runaway tests on the battery cells to study the impact of thermal runaway on the battery cells. Specifically, in the related art, a sensor is usually set on the side where the pressure relief valve of the battery cell is located (i.e., the end face of the pressure relief end of the battery cell) to detect the pressure relief impact when the battery cell has thermal runaway.
[0003] However, in actual use, when a battery cell experiences thermal runaway, the battery cell will be subjected to a large recoil force during pressure relief, causing the end of the battery cell away from the pressure relief end to collide with other structures near the battery cell, such as but not limited to the wiring harness of the battery pack, CCS (Cells Contact System, integrated busbar), etc. The current thermal runaway test cannot detect the impact of the battery cell under the action of the recoil force. Utility Model Content
[0004] The utility model aims to provide a test device for thermal runaway of a battery cell, which can detect the influence of the battery cell under the action of recoil force.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] A test device for thermal runaway of a battery cell is provided, comprising:
[0007] A device seat, the device seat having a setting surface facing upward in a vertical direction, the setting surface being used for placing a pressure relief end of the power core;
[0008] A setting seat, the setting seat comprising a main body and a plurality of supporting protrusions, the main body having a setting groove penetrating along the vertical direction, the setting groove being used to accommodate a portion of the battery cell away from the setting surface, and the battery cell being slidable relative to the setting groove along the vertical direction, a plurality of the supporting protrusions being arranged at intervals on one side of the main body along the vertical direction and located at the periphery of the setting groove, the supporting protrusions being able to support the main body to be spaced above the setting surface along the vertical direction, and a pressure relief channel communicating with the setting groove is formed between any two adjacent supporting protrusions, the setting surface and the main body; and,
[0009] A pressure sensor is disposed on the device seat corresponding to the setting groove, and the pressure sensor is used to be adjacent to an end of the battery core away from the setting surface.
[0010] As a preferred technical solution of the test device for thermal runaway of the battery cell, along the vertical direction, the pressure relief channel has a size h, 8mm≤h≤13mm.
[0011] As a preferred technical solution of the battery cell thermal runaway test device, the setting seat is made of metal; and / or,
[0012] A heating module is arranged in the setting seat, and the heating module can at least heat the groove wall of the setting groove.
[0013] As a preferred technical solution of the test device for thermal runaway of battery cells, the setting seat is detachable from the device seat body.
[0014] As a preferred technical solution of the test device for thermal runaway of the battery cell, the setting surface is provided with a pressure relief groove, which is connected to the pressure relief channel and can be located correspondingly below the setting groove along the vertical direction.
[0015] As a preferred technical solution of the test device for thermal runaway of the battery cell, the setting surface is also provided with a plurality of limit grooves, the plurality of limit grooves are arranged at intervals and are located on the outer periphery of the pressure relief groove, and the plurality of support protrusions can be matched and connected to the plurality of limit grooves in a one-to-one correspondence.
[0016] As a preferred technical solution of the test device for thermal runaway of the battery cell, the device base includes a first plate, a second plate and a connecting rod, the first plate has the setting surface, the second plate is located above the setting surface along the vertical direction, the connecting rod is connected between the first plate and the second plate, the pressure sensor is arranged on the second plate, and the pressure sensor is at least partially located on the side of the second plate facing the setting surface.
[0017] As a preferred technical solution of the test device for thermal runaway of battery cells, the first plate is slidably connected to the connecting rod along the vertical direction, and the device base further includes a first locking mechanism, which can lock the first plate and the connecting rod; and / or,
[0018] The second plate is slidably connected to the connecting rod along the vertical direction, and the device base further comprises a second locking mechanism, and the second locking mechanism can lock the second plate and the connecting rod.
[0019] As a preferred technical solution of the test device for thermal runaway of the battery cell, the device base also includes a third plate, which is arranged on the side of the second plate away from the first plate, and the third plate is fixed to the connecting rod, and the third plate is provided with a screw hole passing through along the vertical direction, the second plate is slidably connected to the connecting rod along the vertical direction, and the side of the second plate away from the first plate is rotatably connected with a stud, and the stud is threadedly connected to the screw hole.
[0020] As a preferred technical solution of the test device for thermal runaway of the battery cell, the device base also includes a second locking mechanism, which includes a sleeve and a locking pin. The sleeve is arranged on the side of the third plate away from the second plate, the inner space of the sleeve corresponds to and is connected to the screw hole, the stud part is located in the inner space, the outer periphery of the sleeve is provided with a locking hole connected to the inner space, the locking pin is threadedly connected to the locking hole, and one end of the locking pin can enter the inner space and press against the stud.
[0021] The beneficial effects of the utility model are:
[0022] By providing the device seat with a setting surface for placing the battery cell, and using the pressure sensor adjacent to the end of the battery cell away from the setting surface (i.e., the end of the battery cell away from the pressure relief end), the pressure sensor can be used to check the force applied to the outside by the end of the battery cell away from the pressure relief end under the action of the recoil force. At the same time, the part of the battery cell away from the setting surface is located in the setting groove of the main body, so that the movement direction of the battery cell relative to the setting seat is limited to the vertical direction by the setting groove, and a pressure relief channel connected to the setting groove is formed between any two adjacent supporting protrusions, the setting surface and the main body, so as to simulate the situation in the battery pack where the battery cell bounces up under the action of the recoil force after thermal runaway and pressure relief occurs, and the pressure relief valve of the battery cell is away from the bracket at the pressure relief end of the battery cell, so that the pressure relief gas can also be sprayed into the space around the pressure relief end of the battery cell, so that the result detected by the pressure sensor is more realistic, and the influence of the battery cell under the action of the recoil force can be detected with higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The utility model is further described in detail below based on the drawings and embodiments.
[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the test device for thermal runaway of a battery cell described in the embodiment.
[0025] Figure 2 It is a schematic top view of the test device for thermal runaway of a battery cell described in the embodiment.
[0026] Figure 3It is a schematic diagram of the structural decomposition of the test device for thermal runaway of a battery cell described in an embodiment at a certain angle.
[0027] Figure 4 It is a schematic diagram of the structural decomposition of the test device for thermal runaway of a battery cell described in the embodiment at another angle.
[0028] Figure 5 for Figure 2 AA section view.
[0029] Figure 6 for Figure 5 A schematic cross-sectional structure diagram of the first plate, the second plate, the pressure sensor and the setting seat (the setting surface is provided with a limiting groove and the battery cell is placed thereon) is shown in FIG.
[0030] In the figure:
[0031] 1. Test device; 10. Device seat; 101. First plate; 101a. Setting surface; 101b. Pressure relief groove; 101c. Limiting groove; 102. Second plate; 1020. Second locking mechanism; 1020a. Sleeve; 1020b. Locking hole; 1021. Stud; 103. Connecting rod; 104. Third plate; 1040. Screw hole; 105. Fourth plate; 11. Setting seat; 110. Main body; 110a. Setting groove; 111. Supporting protrusion; 112. Pressure relief channel; 12. Pressure sensor;
[0032] 2. Battery cell; 20. Pressure relief terminal. DETAILED DESCRIPTION
[0033] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0036] like Figures 1 to 3 As shown, the utility model provides a test device 1 for thermal runaway of a battery cell, comprising a device body 10, a setting seat 11 and a pressure sensor 12. The device body 10 has a setting surface 101a facing upward along a vertical direction L, and the setting surface 101a is used to place the pressure relief end 20 of the battery cell 2. The setting seat 11 comprises a main body 110 and a plurality of supporting protrusions 111. The main body 110 has a setting groove 110a penetrating along the vertical direction L, and the setting groove 110a is used to accommodate a portion of the battery cell 2 away from the setting surface 101a, and the battery cell 2 can slide relative to the setting groove 110a along the vertical direction L. The plurality of supporting protrusions 111 are arranged at intervals on the main body 110 along the vertical direction L. On one side in the vertical direction L and located on the outer periphery of the setting groove 110a, the support protrusion 111 can support the main body 110 to be located above the setting surface 101a along the vertical direction L, and a pressure relief channel 112 connected to the setting groove 110a is formed between any two adjacent support protrusions 111, the setting surface 101a and the main body 110. The pressure sensor 12 is arranged on the device base 10 corresponding to the setting groove 110a, and the pressure sensor 12 is used to be close to the end of the battery cell 2 away from the setting surface 101a.
[0037] The vertical direction L refers to the direction parallel to the gravity direction when the test device 1 is in the posture for testing, and the upper and lower parts along the vertical direction L refer to the upper and lower parts along the gravity direction at this time, respectively. Figure 1 and Figure 2 The vertical direction L is shown by an arrow.
[0038] By making the device seat 10 have a setting surface 101a for placing the battery cell 2, and making the pressure sensor 12 close to the end of the battery cell 2 away from the setting surface 101a (that is, the end of the battery cell 2 away from the pressure relief end 20), the pressure sensor 12 can be used to check the force applied to the outside by the end of the battery cell 2 away from the pressure relief end 20 under the action of the recoil force, and at the same time, the part of the battery cell 2 away from the setting surface 101a is located in the setting groove 110a of the main body 110, so that the movement direction of the battery cell 2 relative to the setting seat 11 is limited to the vertical direction L by the setting groove 110a. Furthermore, a pressure relief channel 112 connected to the setting groove 110a is formed between any two adjacent supporting protrusions 111, the setting surface 101a and the main body 110 to simulate the situation in the battery pack where, after the battery cell 2 has thermal runaway and the pressure is released, it bounces up under the action of the recoil force, so that the pressure relief valve of the battery cell 2 is away from the bracket at the pressure relief end 20 of the battery cell 2, so that the pressure relief gas can also be sprayed into the space around the pressure relief end 20 of the battery cell 2, so that the result detected by the pressure sensor 12 is more true, and the influence of the battery cell 2 under the action of the recoil force can be detected with higher accuracy.
[0039] Optionally, the setting seat 11 can be detached from the device base 10, so that on the one hand, the operator can detach the setting seat 11 from the device base 10, place the end of the battery cell 2 away from the pressure relief end 20 in the setting groove 110a, and then set the setting seat 11 and the battery cell 2 as a whole in the device base 10, so that there is no need to reserve a large operating space in the device base 10, and the setting operation of the battery cell 2 can be completed when the setting seat 11 is set in the device base 10, thereby reducing the difficulty of operating the thermal runaway test of the battery cell 2. On the other hand, by replacing the setting seat 11 with different sizes of the setting groove 110a, the setting seat 11 can be used to limit the battery cells 2 of different sizes, thereby making the test device 1 applicable to thermal runaway tests of more battery cells 2 of different sizes. Among them, the setting seat 11 can be detachably set on the device base 10 by setting and connecting methods including but not limited to placement, magnetic connection, threaded connection, and snap connection.
[0040] Preferably, the setting seat 11 can be placed on the device base 10. In other words, the setting seat 11 and the device base 10 do not need to be fixed by an additional connecting structure, so that the setting process of the setting seat 11 is simple, which can simplify the operating steps of using the test device 1 to perform a thermal runaway test on the battery cell 2.
[0041] like Figures 3 to 6As shown, along the vertical direction L, the pressure relief channel 112 has a size h. It can be understood that the larger the size h is, the smaller the portion of the battery cell 2 that can enter the interior of the setting groove 110a, and the worse the stability of the limiting effect of the setting groove 110a of the main body 110 on the battery cell 2. If the size h is too small, it will cause the pressure relief channel 112 to be able to provide too little pressure relief flow per unit time, and the difference between the pressure relief condition of the battery cell 2 during the test and the actual pressure relief condition will increase. Therefore, the size h should not be too large or too small. Based on this, optionally, the size h can satisfy: 8mm≤h≤13mm. For example, the size h can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12.5mm or 13mm, etc.
[0042] Optionally, the setting seat 11 can be made of metal, for example, the setting seat 11 can be made of materials including but not limited to stainless steel, copper, and aluminum, so that the setting seat 11 can withstand the high-temperature gas ejected when the battery cell 2 is depressurized, and the setting seat 11 is not prone to react quickly with the electrolyte ejected from the battery cell 2 to produce greater corrosion, and the setting seat 11 has a longer service life.
[0043] Preferably, the setting seat 11 can be made of a metal material with a higher density, such as stainless steel, copper, iron, etc., so that the setting seat 11 can have a larger deadweight without changing its volume, so that it can maintain a relatively stable relative position with the device seat 10 during the pressure relief process of the battery cell 2, so as to avoid the displacement of the setting seat 11 causing the battery cell 2 and the pressure sensor 12 to be offset, thereby causing a large error in the test result.
[0044] Optionally, a heating module (not shown in the figure) is provided in the setting seat 11, and the heating module can heat the groove wall of the setting groove 110a at least by means including but not limited to resistance heating, induction heating, arc heating, electron beam heating, infrared heating and dielectric heating, so that an overheated environment can be formed in the setting groove 110a to induce the battery cell 2 in the setting groove 110a to enter a state of thermal runaway. In addition, since the heating module is arranged inside the setting seat 11, on the one hand, during the process of thermal runaway of the battery cell 2, the heating module will not be directly affected by the pressure relief of the battery cell 2, which can extend the service life of the heating module. On the other hand, the heating module can be set with the setting seat 11 sleeved on the outer periphery of the battery cell 2, without the need to perform an additional step of attaching the heating module to the surface of the battery cell 2, which can simplify the operating steps of using the test device 1 to perform a thermal runaway test of the battery cell 2.
[0045] Preferably, as described in the above technical solution, the setting seat 11 is made of metal, so that the setting seat 11 has better thermal conductivity and can more efficiently conduct heat to the groove wall of the setting groove 110a, so as to more efficiently heat the battery cell 2 in the setting groove 110a.
[0046] In other embodiments, the battery cell 2 may be induced to enter a thermal runaway state by attaching a heating film to the surface of the battery cell 2 before the test, connecting wires to the positive and negative electrodes of the battery cell 2 to connect the battery cell 2 to a short circuit or an overcharge circuit, etc.
[0047] In some battery packs, a pressure relief groove 101b may be set on a bracket connected to the pressure relief end 20 corresponding to the pressure relief valve of the battery cell 2. In order to simulate the actual pressure relief situation when the battery cell 2 thermally runs away under this setting, optionally, a pressure relief groove 101b is opened on the setting surface 101a, and the pressure relief groove 101b is connected to the pressure relief channel 112 and can be located correspondingly below the setting groove 110a along the vertical direction L.
[0048] Preferably, the setting surface 101a may also be provided with a plurality of limiting grooves 101c, and the plurality of limiting grooves 101c are arranged at intervals and located on the outer periphery of the pressure relief groove 101b, and the plurality of supporting protrusions 111 can be matched and connected to the plurality of limiting grooves 101c in a one-to-one correspondence, so that when the setting seat 11 is placed on the device seat body 10, the relative position of the pressure relief groove 101b and the setting groove 110a can be limited by the one-to-one matching and connection between the plurality of supporting protrusions 111 and the plurality of limiting grooves 101c, thereby limiting the relative position of the pressure relief groove 101b of the battery cell 2 during the test, so as to improve the consistency of the test conditions during each test.
[0049] More preferably, when the multiple supporting protrusions 111 are connected to the multiple limiting grooves 101c in a one-to-one correspondence, the central axis of the pressure relief groove 101b coincides with the central axis of the setting groove 110a, thereby making it easy to make the central axis of the battery cell 2 roughly coincide with the central axis of the pressure relief groove 101b, and further making it easy to align the pressure relief valve of the battery cell 2 with the pressure relief groove 101b.
[0050] Optionally, the device base 10 includes a first plate 101, a second plate 102 and a connecting rod 103, the first plate 101 has a setting surface 101a, the second plate 102 is spaced above the setting surface 101a along the vertical direction L, the connecting rod 103 is connected between the first plate 101 and the second plate 102, the pressure sensor 12 is arranged on the second plate 102, and the pressure sensor 12 is at least partially located on the side of the second plate 102 facing the setting surface 101a, so that the battery cell 2 and the setting seat 11 can be supported by the first plate 101, and the pressure sensor 12 can be supported by the second plate 102.
[0051] Preferably, there can be multiple connecting rods 103, and the multiple connecting rods 103 are arranged at intervals, so that the number of connection positions of the connecting rods 103 to the first plate 101 and the second plate 102 can be increased by increasing the number of connecting rods 103, thereby improving the overall structural stability of the device base 10.
[0052] Optionally, the spacing between the first plate 101 and the second plate 102 can be adjusted so that, on the one hand, the device base 10 can be suitable for testing a variety of battery cells 2 with different height dimensions along the vertical direction L, and on the other hand, it can facilitate the adjustment of the relative position of the pressure sensor 12 and the battery cell 2 along the vertical direction L, so that before the test starts, the pressure sensor 12 is in a state where it is just docked at the end of the battery cell 2 away from the pressure relief end 20 and no relative pressure force is generated between the pressure sensor 12 and the battery cell 2.
[0053] In order to make the distance between the first plate 101 and the second plate 102 adjustable, in an optional example, the first plate 101 is slidably connected to the connecting rod 103 along the vertical direction L, so that the distance between the first plate 101 and the second plate 102 can be adjusted by sliding the first plate 101 relative to the connecting rod 103 along the vertical direction L.
[0054] Furthermore, the device base 10 may also include a first locking mechanism (not shown in the figure), which can lock the first plate 101 and the connecting rod 103 so that the relative position of the first plate 101 and the connecting rod 103 can be kept stable at least during the test, so as to avoid the displacement of the first plate 101 relative to the connecting rod 103 and affect the authenticity of the test results.
[0055] Exemplarily, the first locking mechanism can be a protruding structure that can be fastened to the connecting rod 103, and the protruding structure can abut against the bottom of the first plate 101 along the vertical direction L to lock the first plate 101 and the connecting rod 103. Alternatively, the first locking mechanism can be a threaded pin threadedly connected to the first plate 101, and the threaded pin can abut against the connecting rod 103 to lock the first plate 101 and the connecting rod 103.
[0056] In another optional example, the second plate 102 is slidably connected to the connecting rod 103 along the vertical direction L, so that the distance between the first plate 101 and the second plate 102 can be adjusted by sliding the second plate 102 along the vertical direction L relative to the connecting rod 103 .
[0057] Optionally, the device base 10 also includes a third plate 104, which is arranged on a side of the second plate 102 away from the first plate 101, and the third plate 104 is fixed to the connecting rod 103, and the third plate 104 is provided with a screw hole 1040 that passes through along the vertical direction L, and the second plate 102 can be slidably connected to the connecting rod 103 along the vertical direction L, and the side of the second plate 102 away from the first plate 101 can be rotatably connected with a stud 1021, and the stud 1021 is threadedly connected to the screw hole 1040, so that the relative position of the stud 1021 and the screw hole 1040 in the vertical direction L can be fine-tuned by rotating the stud 1021, thereby achieving fine-tuning of the spacing between the second plate 102 and the first plate 101, so that it is easier to adjust the pressure sensor 12 to a state where it just rests on the end of the battery cell 2 away from the pressure relief end 20 and no relative pressing force is generated between the battery cell 2 before the test.
[0058] Furthermore, the device base 10 may also include a second locking mechanism 1020, which can lock the second plate 102 and the connecting rod 103 so that the relative position of the second plate 102 and the connecting rod 103 can remain stable at least during the test, so as to avoid the displacement of the second plate 102 relative to the connecting rod 103 and affect the authenticity of the test results.
[0059] Exemplarily, the second locking mechanism 1020 can be a protruding structure that can be fastened to the connecting rod 103, and the protruding structure can abut against the bottom of the second plate 102 along the vertical direction L to lock the second plate 102 and the connecting rod 103. Alternatively, the second locking mechanism 1020 can be a threaded pin threadedly connected to the second plate 102, and the threaded pin can abut against the connecting rod 103 to lock the second plate 102 and the connecting rod 103.
[0060] When, as described in the aforementioned technical solution, the device base 10 also includes a third plate 104 and a stud 1021, illustratively, the second locking mechanism 1020 may include a sleeve 1020a and a locking pin (not shown in the figure), the sleeve 1020a is arranged on the side of the third plate 104 away from the second plate 102, the inner space of the sleeve 1020a is correspondingly connected to the screw hole 1040, the stud 1021 is partially located in the inner space, the outer periphery of the sleeve 1020a is provided with a locking hole 1020b connected to the inner space, the locking pin is threadedly connected to the locking hole 1020b, and one end of the locking pin can enter the inner space and press against the stud 1021, so that the sleeve 1020a and the screw are locked by cooperating with the locking pin and the locking hole 1020b, so as to achieve locking of the second plate 102 and the connecting rod 103.
[0061] In another optional example, the first plate 101 and the second plate 102 can be slidably connected to the connecting rod 103 along the vertical direction L, so that the distance between the first plate 101 and the second plate 102 can be adjusted by sliding the first plate 101 and the second plate 102 along the vertical direction L relative to the connecting rod 103 respectively.
[0062] Preferably, the spacing between the first plate 101 and the second plate 102 is roughly adjusted by sliding the first plate 101 relative to the connecting rod 103 along the vertical direction L, and the spacing between the first plate 101 and the second plate 102 is finely adjusted by sliding the second plate 102 relative to the connecting rod 103 along the vertical direction L.
[0063] At this time, regarding other specific structures of the device base 10, please refer to the description in the aforementioned technical solution that the first plate 101 is slidably connected to the connecting rod 103 along the vertical direction L, and the second plate 102 is slidably connected to the connecting rod 103 along the vertical direction L, and will not be repeated here.
[0064] Optionally, the device base 10 may further include a fourth plate 105 , which is disposed on a side of the first plate 101 away from the second plate 102 , and the fourth plate 105 is fixed to the connecting rod 103 , so that the connecting rod 103 can be fixed by the fourth plate 105 .
[0065] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0066] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.
[0067] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0068] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.
Claims
1. A test device for thermal runaway of a battery cell, characterized in that: include: A device seat, the device seat having a setting surface facing upward in a vertical direction, the setting surface being used for placing a pressure relief end of the power core; A setting seat, the setting seat comprising a main body and a plurality of supporting protrusions, the main body having a setting groove penetrating along the vertical direction, the setting groove being used to accommodate a portion of the battery cell away from the setting surface, and the battery cell being slidable relative to the setting groove along the vertical direction, a plurality of the supporting protrusions being arranged at intervals on one side of the main body along the vertical direction and located at the periphery of the setting groove, the supporting protrusions being able to support the main body to be spaced above the setting surface along the vertical direction, and a pressure relief channel communicating with the setting groove is formed between any two adjacent supporting protrusions, the setting surface and the main body; and, A pressure sensor is disposed on the device seat corresponding to the setting groove, and the pressure sensor is used to be adjacent to an end of the battery core away from the setting surface.
2. The battery cell thermal runaway test device according to claim 1, characterized in that: Along the vertical direction, the pressure relief channel has a dimension h, 8mm≤h≤13mm.
3. The battery cell thermal runaway test device according to claim 1, characterized in that: The setting seat is made of metal; and / or, A heating module is arranged in the setting seat, and the heating module can at least heat the groove wall of the setting groove.
4. The battery cell thermal runaway test device according to claim 1, characterized in that: The setting seat is detachable from the device seat body.
5. The battery cell thermal runaway test device according to claim 1, characterized in that: The setting surface is provided with a pressure relief groove, which is communicated with the pressure relief channel and can be located correspondingly below the setting groove along the vertical direction.
6. The battery cell thermal runaway test device according to claim 5, characterized in that: The setting surface is also provided with a plurality of limiting grooves, which are arranged at intervals and located at the outer periphery of the pressure relief groove, and the plurality of supporting protrusions can be matched and connected to the plurality of limiting grooves in a one-to-one correspondence.
7. The battery cell thermal runaway test device according to any one of claims 1 to 6, characterized in that: The device base includes a first plate, a second plate and a connecting rod, the first plate has the setting surface, the second plate is located above the setting surface along the vertical direction, the connecting rod is connected between the first plate and the second plate, the pressure sensor is arranged on the second plate, and the pressure sensor is at least partially located on the side of the second plate facing the setting surface.
8. The battery cell thermal runaway test device according to claim 7, characterized in that: The first plate is slidably connected to the connecting rod along the vertical direction, and the device base further comprises a first locking mechanism, and the first locking mechanism can lock the first plate and the connecting rod; and / or, The second plate is slidably connected to the connecting rod along the vertical direction, and the device base further comprises a second locking mechanism, and the second locking mechanism can lock the second plate and the connecting rod.
9. The battery cell thermal runaway test device according to claim 7, characterized in that: The device base also includes a third plate, which is arranged on a side of the second plate away from the first plate, and the third plate is fixed to the connecting rod. The third plate is provided with a screw hole passing through along the vertical direction, the second plate is slidably connected to the connecting rod along the vertical direction, and the side of the second plate away from the first plate is rotatably connected with a stud, and the stud is threadedly connected to the screw hole.
10. The battery cell thermal runaway test device according to claim 9, characterized in that: The device base also includes a second locking mechanism, which includes a sleeve and a locking pin. The sleeve is arranged on a side of the third plate away from the second plate, the inner space of the sleeve is correspondingly connected to the screw hole, the stud is partially located in the inner space, the outer periphery of the sleeve is provided with a locking hole connected to the inner space, the locking pin is threadedly connected to the locking hole, and one end of the locking pin can enter the inner space and press against the stud.