Battery cell thermal runaway testing device

Abstract

The utility model relates to the technical field of lithium battery testing, in particular to a battery cell thermal runaway testing device. The cell thermal runaway testing device comprises a clamping plate, a thermocouple and an attachment net. The number of the clamping plates is two, the two clamping plates are oppositely arranged so as to clamp the battery cell, an attachment net is arranged between the battery cell and the clamping plate on at least one side, the melting point of the attachment net is higher than 1000 DEG C, the thermocouple is arranged on the attachment net in a snakelike penetrating mode through meshes in the attachment net, and the temperature measuring end of the thermocouple extends out of the side, facing the battery cell, of the attachment net. The attachment net can be pressed against the surface of the battery cell, so that the temperature measuring end of the thermocouple is attached to the surface of the battery cell, and the temperature of the battery cell is monitored. Therefore, the thermocouple is stably fixed on the surface of the battery cell by using the attachment net, so that the thermocouple is not easy to shift or fall off, and the temperature measurement result of the thermocouple is accurate; meanwhile, the attachment net provided with the thermocouples in a penetrating mode can be repeatedly used in multiple tests, so that the arrangement efficiency of the thermocouples in the testing process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery testing, in particular to a battery core thermal runaway testing device. Background Art

[0002] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. In order to evaluate the safety performance of batteries, researchers usually use thermal runaway testing equipment to conduct safety experiments on battery cells.

[0003] In the thermal runaway test of the battery cell, it is necessary to use a thermocouple to monitor the temperature of the battery cell. Therefore, it is necessary to ensure that the thermocouple is firmly fixed to the surface of the battery cell during the test so that the thermocouple will not shift or fall off, so as to ensure the accuracy of the measurement data. Utility Model Content

[0004] The utility model aims to provide a battery core thermal runaway testing device, so as to stably fix a thermocouple on the surface of the battery core.

[0005] The utility model provides a battery core thermal runaway test device, comprising a clamping plate, an attachment net and a thermocouple;

[0006] The two clamping plates are arranged opposite to each other to clamp the battery core;

[0007] An attachment net is provided between the clamping plate on at least one side and the battery core, the melting point of the attachment net is higher than 1000° C. The thermocouple is serpentinely wound on the attachment net through the mesh of the attachment net, and the temperature measuring end of the thermocouple is in contact with the surface of the battery core.

[0008] Furthermore, a heating plate is provided between the clamping plate and the battery core on at least one side to heat the battery core;

[0009] The attachment net is arranged adjacent to the battery core.

[0010] Furthermore, a heat insulation pad is disposed adjacent to one side of each clamping plate facing the battery core.

[0011] Furthermore, the thermal insulation pad is bonded to the adjacent clamping plates.

[0012] Furthermore, the thermal insulation pad is a thermal insulation cotton pad, an aerogel pad or a mica pad.

[0013] Furthermore, a plurality of the thermocouples are wound around the attachment net, and the temperature measuring ends of the plurality of the thermocouples are distributed at intervals.

[0014] Furthermore, the two clamping plates are fastened together by fasteners.

[0015] Furthermore, the battery cell thermal runaway test device also includes a base, and the two clamps are slidably disposed on the base so as to be able to move closer to or farther away from each other.

[0016] Furthermore, the base is provided with a first driving device and a transmission screw;

[0017] The transmission screw is arranged along the sliding direction of the clamping plates, and the two clamping plates are both screwed to the transmission screw;

[0018] The driving end of the first driving device is connected to the driving screw to drive the driving screw to rotate.

[0019] Furthermore, a second driving device is provided on the base;

[0020] The second driving devices are provided in two sets, and the driving ends of the two second driving devices are connected to the two clamping plates one by one, so as to drive the two clamping plates to move closer to each other or away from each other.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The battery cell thermal runaway test device provided by the utility model comprises a clamp, a thermocouple and an attachment net. There are two clamps arranged opposite to each other, and the battery cell to be tested can be placed between the two clamps, and the two clamps are used to clamp the battery cell; the surface with the largest area among the multiple surfaces of the battery cell is the large surface of the battery cell, and when the battery cell is clamped between the two clamps, the large surface of the battery cell is opposite to the two clamps, so that the two clamps are used to simulate the actual application scenario of the battery cell in the battery module, that is, the two sides of the battery cell with the large surface are blocked and constrained in the battery module. An attachment net is provided between the battery cell and at least one side of the clamp, and a plurality of mesh holes are provided on the attachment net, and the thermocouple is snake-shapedly inserted on the attachment net through the mesh holes on the attachment net, and the temperature measuring end of the thermocouple extends from the attachment net toward one side of the battery cell. When the two clamps clamp the battery cell, the attachment net can be pressed against the surface of the battery cell, so that the temperature measuring end of the thermocouple is in contact with the surface of the battery cell to monitor the temperature of the battery cell. Therefore, the thermocouple can be stably fixed on the surface of the battery cell by using the attachment net, so that the thermocouple will not shift or fall off when the temperature of the battery cell is monitored, thereby ensuring the accuracy of the temperature measurement result of the thermocouple; at the same time, the attachment net with the thermocouple does not need to be disassembled after completing a test, and can be reused in multiple tests, thereby improving the efficiency of the arrangement of the thermocouples during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a battery cell thermal runaway testing device provided in an embodiment of the utility model.

[0025] Reference numerals:

[0026] 1- clamping plate, 2- heat insulation pad, 3- heating plate, 4- attachment net, 5- battery cell, 6- fastener. DETAILED DESCRIPTION

[0027] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0028] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0029] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Refer to the following Figure 1 A battery cell thermal runaway testing device according to some embodiments of the present invention is described.

[0033] The utility model provides a battery core thermal runaway test device, such as Figure 1 As shown, the battery cell thermal runaway test device includes a clamp 1, a thermocouple and an attachment net 4.

[0034] There are two clamps 1 arranged opposite to each other, and the battery cell 5 to be tested can be placed between the two clamps 1, and the battery cell 5 is clamped by the two clamps 1; the surface with the largest area among the multiple surfaces of the battery cell 5 is the large surface of the battery cell 5, and when the battery cell 5 is clamped between the two clamps 1, the large surface of the battery cell 5 is opposite to the two clamps 1, so that the two clamps 1 are used to simulate the actual application scenario of the battery cell 5 in the battery module, that is, the two sides of the large surface of the battery cell 5 are blocked and constrained in the battery module.

[0035] An attachment net 4 is provided between the battery cell 5 and at least one side of the clamping plate 1, and a plurality of mesh holes are provided on the attachment net 4. The thermocouple is serpentinely inserted into the attachment net 4 through the mesh holes on the attachment net 4, that is, the thermocouple is inserted back and forth multiple times on both sides of the attachment net 4 through the plurality of mesh holes on the attachment net 4; the temperature measuring end of the thermocouple extends from the attachment net 4 toward one side of the battery cell 5. When the two clamping plates 1 clamp the battery cell 5, the attachment net 4 can be pressed against the surface of the battery cell 5, so that the temperature measuring end of the thermocouple is in contact with the surface of the battery cell 5, so as to monitor the temperature of the battery cell 5. Thus, the thermocouple is stably fixed on the surface of the battery cell 5 by using the attachment net 4, so that the thermocouple will not shift or fall off when the temperature of the battery cell 5 is monitored, thereby ensuring that the temperature measurement result of the thermocouple is accurate; at the same time, the attachment net 4 with the thermocouple does not need to be disassembled after completing a test, and can be reused in multiple tests, thereby improving the efficiency of the arrangement of the thermocouple during the test; at the same time, the melting point of the attachment net is higher than 1000°C, so that when the battery cell has thermal runaway during the test, the attachment net will not melt and cause the thermocouple to shift.

[0036] Preferably, the attachment net 4 is made of 304 stainless steel with a melting point of 1400°C to 1450°C, so that the attachment net 4 has good high temperature resistance to ensure that the attachment net will not melt due to high temperature during the battery cell thermal runaway test, causing the thermocouple to shift.

[0037] In this embodiment, preferably, a plurality of thermocouples are provided on the attachment net 4, the temperature measuring ends of the plurality of thermocouples all extend toward the direction of the battery core 5, and the temperature measuring ends of the plurality of thermocouples are spaced apart on the surface of the battery core 5, thereby realizing multi-point monitoring of the temperature of the battery core 5.

[0038] In one embodiment of the utility model, preferably, the battery cell thermal runaway test device further comprises a heating plate 3, at least one side of the battery cell 5 is provided with a heating plate 3, the heating plate 3 is clamped between the battery cell 5 and the clamping plate 1, and when one side of the battery cell 5 is provided with both a heating plate 3 and an attachment net 4, the attachment net 4 is arranged adjacent to the battery cell 5, that is, the attachment net 4 is located between the heating plate 3 and the battery cell 5, so as to ensure that the temperature measuring end of the thermocouple on the attachment net 4 can be attached to the surface of the battery cell 5. The heating plate 3 is used to heat the battery cell 5 to provide a heat source for thermal runaway of the battery cell 5 during the test process.

[0039] In one embodiment of the utility model, preferably, the battery cell thermal runaway test device further comprises a thermal insulation pad 2, and the thermal insulation pad 2 is disposed adjacent to the side of the two clamping plates 1 facing the battery cell 5, that is, for the thermal insulation pad 2, the heating plate 3 and the attachment net 4 on the same side, the heating plate 3 and the attachment net 4 are both located on the side of the thermal insulation pad 2 facing the battery cell 5. For example, Figure 1 In the figure, an attachment net 4 is provided on both sides of the battery cell 5, a heating plate 3 is provided on the left side of the battery cell 5, and on the left side of the battery cell 5, a clamping plate 1, a thermal insulation pad 2, a heating plate 3 and an attachment net 4 are arranged from left to right in sequence, and on the right side of the battery cell 5, a clamping plate 1, a thermal insulation pad 2 and an attachment net 4 are arranged from right to left in sequence.

[0040] When the battery cell 5 is actually used in a battery module, mica sheets are provided on both sides of the battery cell 5 for heat insulation. Therefore, by providing the heat insulation pad 2, the actual application scenario of the battery cell 5 in the battery module can be simulated.

[0041] In this embodiment, preferably, the thermal insulation pad 2 is a thermal insulation cotton pad, an aerogel pad or a mica pad. The thermal insulation cotton pad is compressible and can well simulate the scene where the battery cell 5 is fully covered in the battery module.

[0042] In this embodiment, preferably, the thermal insulation pad 2 is bonded to the adjacent clamping plate 1, so that the clamping plate 1 and the thermal insulation pad 2 are connected as a whole, making it more convenient to assemble the test device during testing.

[0043] In one embodiment of the utility model, two clamps 1 are fastened together by fasteners 6, so that the two clamps 1 can clamp the battery cell 5, thermal insulation pad 2, heating plate 3 and attachment net 4 located therebetween, and the clamping force can be adjusted.

[0044] Specifically, the two clamping plates 1 are provided with a plurality of connection holes at intervals in the circumferential direction, and the plurality of connection holes of the two clamping plates 1 are arranged opposite to each other in a one-to-one correspondence, and each group of two opposite connection holes is provided with a fastener 6, so that the two clamping plates 1 are connected by the fastener 6, so that the two clamping plates 1 clamp the components therebetween. The fastener 6 includes a fastening bolt and a fastening nut, the fastening bolt is passed through the two clamping plates 1, and the fastening nut is screwed on the fastening bolt, so that the two clamping plates 1 are limited between the nut of the fastening bolt and the fastening nut, and the clamping force between the two clamping plates 1 can be adjusted by adjusting the fastening nut.

[0045] In one embodiment of the utility model, preferably, the battery cell thermal runaway test device further comprises a base, and two clamps 1 are arranged opposite to each other and are respectively slidably connected to the base, so that the two clamps 1 can slide to approach or move away from each other. Before or after the test, the two clamps 1 can be moved away from each other to facilitate loading or removing the battery cell 5, the attachment net 4, the thermal insulation pad 2 and the heating plate 3 between the two clamps 1; during the test, the two clamps 1 can be moved closer to each other so that the two clamps 1 clamp the battery cell 5, the attachment net 4, the thermal insulation pad 2 and the heating plate 3 in the middle.

[0046] Regarding a method of driving the sliding of the two clamping plates 1, preferably, a first driving device and a transmission screw are provided on the base, the transmission screw is provided on one side of the two clamping plates 1 along the sliding direction of the clamping plates 1, and the two clamping plates 1 are respectively screwed to the transmission screw through nut seats; the first driving device is fixed to the base, and the driving end of the first driving device is connected to the transmission screw, so that the transmission screw can rotate around its own axis under the drive of the first driving device. Therefore, by driving the transmission screw to rotate clockwise or counterclockwise by the first driving device, the two clamping plates 1 can be moved closer to or away from each other.

[0047] Regarding another way of driving the sliding of the two splints 1, preferably, a second driving device is provided on the base, and the second driving device is set in two units, the driving end of one driving device is connected to one splint 1, and the driving end of the other driving device is connected to the other splint 1, and the two driving devices can drive the splints 1 connected thereto to slide, so as to make the two splints 1 approach each other or move away from each other; for example, the second driving device is a driving cylinder.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery cell thermal runaway test device, characterized in that: Includes splint, attachment mesh and thermocouple; The two clamping plates are arranged opposite to each other to clamp the battery core; An attachment net is provided between the clamping plate on at least one side and the battery core, the melting point of the attachment net is higher than 1000° C. The thermocouple is serpentinely wound on the attachment net through the mesh of the attachment net, and the temperature measuring end of the thermocouple is in contact with the surface of the battery core.

2. The battery cell thermal runaway test device according to claim 1, characterized in that: A heating plate is provided between the clamping plate on at least one side and the battery core to heat the battery core; The attachment net is arranged adjacent to the battery core.

3. The battery cell thermal runaway test device according to claim 1, characterized in that: A heat insulation pad is disposed adjacent to one side of each clamping plate facing the battery core.

4. The battery cell thermal runaway test device according to claim 3, characterized in that: The heat insulation pad is bonded to the adjacent clamping plates.

5. The battery cell thermal runaway test device according to claim 3, characterized in that: The thermal insulation pad is a thermal insulation cotton pad, an aerogel pad or a mica pad.

6. The battery cell thermal runaway test device according to claim 1, characterized in that: A plurality of the thermocouples are wound around the attachment net, and the temperature measuring ends of the plurality of the thermocouples are distributed at intervals.

7. The battery cell thermal runaway test device according to claim 1, characterized in that: The two clamping plates are fastened and connected via fasteners.

8. The battery cell thermal runaway test device according to claim 1, characterized in that: It also includes a base, and the two clamping plates are slidably arranged on the base so as to be able to approach or move away from each other.

9. The battery cell thermal runaway test device according to claim 8, characterized in that: The base is provided with a first driving device and a transmission screw; The transmission screw is arranged along the sliding direction of the clamping plates, and the two clamping plates are both screwed to the transmission screw; The driving end of the first driving device is connected to the driving screw to drive the driving screw to rotate.

10. The battery cell thermal runaway test device according to claim 8, characterized in that: A second driving device is provided on the base; The second driving devices are provided in two sets, and the driving ends of the two second driving devices are connected to the two clamping plates one by one, so as to drive the two clamping plates to move closer to each other or away from each other.

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