Lithium battery thermal runaway test tool

Abstract

The utility model relates to a lithium battery thermal runaway test tool. Relates to the technical field of battery testing. The heating device specifically comprises a heating base, a heating upper cover and a connecting piece, and the heating base and the heating upper cover are connected through the connecting piece so that the heating upper cover and the heating base can be spliced; a first half groove is formed in the heating base, a second half groove is formed in the heating upper cover, the first half groove and the second half groove are spliced to form a heating channel for inserting a lithium battery, a heating surface is formed on the inner wall of the heating channel, and the heating surface is attached to the outer wall of the lithium battery and used for heating the lithium battery. According to the lithium battery testing device, an integral structure formed by the heating base and the heating upper cover is used for transferring heat, the lithium battery is heated, so that the testing cost is reduced, the heating channel formed by the first half groove and the second half groove is used for limiting the lithium battery, the heating surface of the inner wall of the heating channel is completely attached to the outer wall of the lithium battery, and the testing efficiency is improved. Therefore, the safety of the test is ensured, and the accuracy of the test result is also ensured.

Description

Technical Field

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

[0002] Due to their advantages such as high working voltage, high power density and energy density, long charge and discharge life, no memory effect, and no pollution, lithium-ion batteries are widely used in various electronic components, such as laptop computers, cameras, mobile phones, etc. However, the safety issue of lithium-ion batteries has always been a major problem restricting their further development. The safety issue of batteries ultimately reflects the temperature issue. The ultimate result of any safety issue is that the temperature rises until it gets out of control, resulting in safety accidents. Therefore, obtaining the temperature of lithium-ion battery thermal runaway and predicting the thermal runaway environment of lithium-ion batteries are of great significance for preventing lithium-ion battery thermal runaway.

[0003] Currently, when conducting thermal runaway tests on lithium-ion batteries, the common practice is to use a heating film to stick on the surface of the battery cell, and then place it on a fixed device for testing. The lithium-ion battery is heated through the heating film, and the temperature of the lithium-ion battery is monitored through a thermometer to obtain the temperature of lithium-ion battery thermal runaway. This testing method has the following disadvantages: ① There may be safety accidents during the testing process due to the lack of matching fixtures; ② The excessive loss of the heating film increases the testing cost; ③ The uneven sticking of the heating film may lead to inaccurate test results. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a thermal runaway test tooling for lithium batteries, which can realize the thermal runaway test of lithium batteries, reduce the testing cost, and ensure the accuracy of test results, aiming at the deficiencies of the above-mentioned existing technologies.

[0005] The utility model provides a thermal runaway test tooling for lithium batteries, including a heating base, a heating upper cover and a connecting piece. The connecting piece connects the heating base and the heating upper cover to enable the heating upper cover and the heating base to be joined together. The heating base is provided with a first half groove, and the heating upper cover is provided with a second half groove. The first half groove and the second half groove are joined together to form a heating channel for inserting a lithium battery. The inner wall of the heating channel forms a heating surface, and the heating surface is attached to the outer wall of the lithium battery to heat the lithium battery.

[0006] Furthermore, the heating base is also provided with a wire harness reserved groove for the wire harness of the thermometer to pass through. The wire harness reserved groove is arranged at the bottom of the first half groove and is communicated with the first half groove.

[0007] Further, the heating base includes a base body and a base sleeve provided on the base body. The base sleeve is detachably connected to the base body, and the first half groove is provided on the base sleeve; the heating upper cover includes an upper cover body and an upper cover sleeve provided on the upper cover body. The upper cover sleeve is detachably connected to the upper cover body, and the second half groove is provided on the upper cover sleeve.

[0008] Further, a first installation groove matching the outer contour of the base sleeve is provided on the base body. A first countersunk hole is provided on the base sleeve, and a first threaded hole is provided at the bottom of the first installation groove. The heating base further includes a first countersunk bolt that passes through the first countersunk hole at one end and is screwed into the first threaded hole.

[0009] Further, a second installation groove matching the outer contour of the upper cover sleeve is provided on the upper cover body. A second countersunk hole is provided on the upper cover sleeve, and a second threaded hole is provided at the bottom of the second installation groove. The heating upper cover further includes a second countersunk bolt that passes through the second countersunk hole at one end and is screwed into the second threaded hole.

[0010] Further, a first connecting plate is provided on the heating base, and a second connecting plate is provided on the heating upper cover. A through hole is provided on the first connecting plate. The connecting member includes a screw member provided on the second connecting plate and a limit nut screwed onto the screw member. One end of the screw member passes through the through hole and is screwed onto the limit nut.

[0011] Further, the top of the screw member is rotatably connected to the second connecting plate. A screw inlet and outlet groove communicating the through hole with the outside is further provided on the first connecting plate. The screw inlet and outlet groove is used for the middle part of the screw member to enter and exit the through hole, and the limit nut is screwed onto the bottom of the screw member.

[0012] Further, at least two insertion posts are provided on the heating base, and at least two insertion slots are provided on the heating upper cover. When the heating upper cover and the heating base are assembled, at least two of the insertion posts are respectively inserted into at least two of the insertion slots.

[0013] Further, a plurality of the first half grooves are provided on the heating base, and a plurality of the second half grooves are provided on the heating upper cover. One of the first half grooves and one of the second half grooves are assembled to form the heating channel for inserting a lithium battery.

[0014] Further, the length of the heating channel is less than or equal to the length of the lithium battery.

[0015] The lithium battery thermal runaway test tool of the present utility model has the following beneficial effects:

[0016] (1) This test tooling conducts heat transfer through the overall structure formed by the heating base and the heating upper cover to achieve heating of the lithium battery. The heating base and the heating upper cover can be reused multiple times, thereby reducing the test cost. Moreover, the heating channel formed by the first half groove and the second half groove limits the lithium battery, enabling the heating surface on the inner wall of the heating channel to be completely attached to the outer wall of the lithium battery, thus ensuring both the safety of the test and the accuracy of the test results;

[0017] (2) A wire harness reserved groove is also provided on the heating base of this test tooling. The wire harness reserved groove is arranged at the bottom of the first half groove and is connected to the first half groove. When detecting the temperature of the lithium battery through a thermometer, when the patch of the thermometer is attached to the positive electrode, negative electrode, and the surface located in the heating channel of the lithium battery, the wire harness reserved groove provides a routing path for the wire harness of the thermometer. Therefore, when conducting a thermal runaway test on the lithium battery, the routing of the thermometer is more regular, and further, the practicality of this test tooling is stronger;

[0018] (3) Multiple first half grooves are provided on the heating base of this test tooling, and multiple second half grooves are provided on the heating upper cover. Therefore, when the heating upper cover and the heating base are assembled, multiple heating channels for inserting the lithium batteries are formed, enabling this test tooling to simultaneously conduct thermal runaway tests on multiple lithium batteries, greatly improving the test efficiency;

[0019] (4) A first connecting plate is provided on the heating base of this test tooling, and through holes are provided on the first connecting plate. A second connecting plate is provided on the heating upper cover. The connecting member includes a screw member and a limit nut. After one end of the screw member passes through the through hole on the first connecting plate, it is screwed with the limit nut to achieve the fixed connection between the heating upper cover and the heating base, making the use of this test tooling simpler and more convenient;

[0020] (5) At least two insertion columns are provided on the heating base of this test tooling, and at least two insertion slots are provided on the heating upper cover. Through the cooperation of the at least two insertion columns and the at least two insertion slots, the covering position of the heating upper cover on the heating base is positioned, facilitating the alignment of the screw member on the second connecting plate with the through hole on the first connecting plate, further making the use of this test tooling simpler, more convenient, and easier to implement;

[0021] (6) The base sleeve of this test tooling is detachably connected to the base body, and the upper cover sleeve is detachably connected to the upper cover base. Therefore, this test tooling can replace the base sleeve with different first half groove sizes and the upper cover sleeve with different second half groove sizes according to lithium batteries of different sizes, enabling this test tooling to be applicable to thermal runaway tests of lithium batteries of various sizes, enhancing the practicality of this test tooling, and reducing the test cost. Description of the Drawings

[0022] The accompanying drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model. In these drawings, like reference numerals are used to represent like elements.

[0023] Figure 1 It is a schematic structural diagram of a lithium battery thermal runaway test tooling according to an embodiment of the present utility model;

[0024] Figure 2 It is an explosion diagram when a lithium battery thermal runaway test tooling according to an embodiment of the present utility model conducts a thermal runaway test on a lithium battery;

[0025] Figure 3 It is an explosion diagram of a heating base of a lithium battery thermal runaway test tooling according to an embodiment of the present utility model;

[0026] Figure 4 It is a schematic structural diagram of a heating main body of a lithium battery thermal runaway test tooling according to an embodiment of the present utility model;

[0027] Figure 5 It is a schematic structural diagram of a heating sleeve of a lithium battery thermal runaway test tooling according to an embodiment of the present utility model;

[0028] Figure 6 It is an explosion diagram of a heating upper cover of a lithium battery thermal runaway test tooling according to an embodiment of the present utility model.

[0029] In the figure: 1. Heating base; 11. Base main body; 111. First installation groove; 112. First threaded hole; 113. First connecting plate; 1131. Through hole; 1132. Screw rod access groove; 114. Insertion column; 12. Base sleeve; 121. First half groove; 122. Wiring harness reserved groove; 123. First counterbore; 13. First countersunk head bolt; 2. Heating upper cover; 21. Upper cover main body; 211. Second installation groove; 212. Second threaded hole; 213. Second connecting plate; 214. Insertion slot; 22. Upper cover sleeve; 221. Second half groove; 222. Second counterbore; 23. Second countersunk head bolt; 3. Connector; 31. Screw rod part; 32. Limit nut; 4. Lithium battery; 5. Heating channel. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0031] Please refer to Figures 1 to 6, A thermal runaway test tool for an embodiment of the present utility model includes a heating base 1, a heating upper cover 2, and a connecting member 3. The connecting member 3 connects the heating base 1 and the heating upper cover 2 to enable the heating upper cover 2 and the heating base 1 to be joined together. The heating base 1 is provided with a first half groove 121, and the heating upper cover 2 is provided with a second half groove 221. The first half groove 121 and the second half groove 221 are joined together to form a heating channel 5 for inserting a lithium battery 4. The inner wall of the heating channel 5 forms a heating surface, and the heating surface is in contact with the outer wall of the lithium battery 4 to heat the lithium battery 4.

[0032] In this application, the test tool includes a heating base 1, a heating upper cover 2, and a connecting member 3. The connecting member 3 connects the heating base 1 and the heating upper cover 2, so that the heating base 1 and the heating upper cover 2 are joined together to form an integral structure. A first half groove 121 is provided on the heating base 1, and a second half groove 221 is provided on the heating upper cover 2. When the heating base 1 and the heating upper cover 2 are joined together to form an integral structure, the first half groove 121 and the second half groove 221 are joined together to form a heating channel 5.

[0033] The inner wall of the heating channel 5 forms a heating surface. When performing a thermal runaway test on the lithium battery 4, first insert the lithium battery 4 into the heating channel 5, so that the outer wall of the lithium battery 4 is in contact with the heating surface on the inner wall of the heating channel 5, thereby limiting the lithium battery 4 through the heating channel 5. Then heat the integral structure formed by the heating base 1 and the heating upper cover 2, so that the heat in the heating base 1 and the heating upper cover 2 is transferred to the lithium battery 4 through the heating surface, thereby heating the lithium battery 4. Then monitor the temperature of the lithium battery 4 through a thermometer to obtain the temperature when the lithium battery 4 undergoes thermal runaway, thereby realizing the thermal runaway test of the lithium battery 4.

[0034] Since in actual production, there are various shapes of lithium batteries 4, such as cylindrical lithium batteries, square lithium batteries, etc. In this application, when the test tool performs a thermal runaway test on the lithium battery 4, it is necessary to insert the lithium battery 4 into the heating channel 5 formed by the joining of the first half groove 121 and the second half groove 221. Therefore, the heating channel 5 needs to be adapted to the outer contour of the lithium battery 4. That is, in this application, the first half groove 121 on the heating base 1 and the second half groove 221 on the heating upper cover 2 can be designed according to the shape of the lithium battery 4.

[0035] For example, when performing a thermal runaway test on a cylindrical lithium battery 4, the first half groove 121 and the second half groove 221 can be semi-cylindrical grooves, so that the first half groove 121 and the second half groove 221 are joined together to form a complete cylindrical heating channel 5 for inserting the cylindrical lithium battery 4. When performing a thermal runaway test on a square lithium battery 4, the first half groove 121 and the second half groove 221 can be semi-rectangular grooves, so that the first half groove 121 and the second half groove 221 are joined together to form a complete rectangular heating channel 5 for inserting the square lithium battery 4.

[0036] In the prior art, the lithium battery 4 is heated by attaching a heating film to its surface. Since the thermal runaway test of the lithium battery 4 usually needs to be carried out multiple times, and this kind of heating film is generally disposable and needs to be replaced after each test, which results in a large loss of the heating film and increases the test cost. Moreover, when the lithium battery 4 is heated by attaching the heating film, the attachment of the heating film may be uneven during the thermal runaway test, resulting in inaccurate test results.

[0037] In this application, the test tooling transfers heat through the overall structure formed by the heating base 1 and the heating upper cover 2 to achieve the heating of the lithium battery 4. The heating base 1 and the heating upper cover 2 can be reused multiple times, thus reducing the test cost. Also, when this test tooling conducts a thermal runaway test on the lithium battery 4, the first half groove 121 provided on the heating base 1 and the second half groove 221 provided on the heating upper cover 2 form a heating channel 5 to limit the lithium battery 4, and the heating surface on the inner wall of the heating channel 5 is completely attached to the outer wall of the lithium battery 4, so that the heating base 1 and the heating upper cover 2 heat the lithium battery 4 evenly, ensuring both the safety of the test and the accuracy of the test results.

[0038] It can be foreseen that in this application, the heating base 1 and the heating upper cover 2 are made of materials with good thermal conductivity, so that when heating the overall structure formed by the heating base 1 and the heating upper cover 2, the heating base 1 and the heating upper cover 2 can better transfer heat to the lithium battery 4 inserted in the heating channel 5. Specifically, in actual implementation, the heating base 1 and the heating upper cover 2 can be made of graphene polymer heating plates.

[0039] When the thermometer monitors the temperature of the lithium battery 4, usually the patches of the thermometer are attached to the surface, the positive electrode and the negative electrode of the lithium battery 4 for temperature monitoring at multiple positions. Therefore, in this embodiment, the length of the heating channel 5 is less than or equal to the length of the lithium battery 4. When the lithium battery 4 is inserted into the heating channel 5 and limited by the heating channel 5, the positive electrode and the negative electrode at both ends of the lithium battery 4 are exposed, which is convenient for attaching the patches of the thermometer to the surface, the positive electrode and the negative electrode of the lithium battery 4 for temperature monitoring at multiple positions, and further enhances the practicability of this test tooling.

[0040] As mentioned above, when the thermometer monitors the temperature of the lithium battery 4, usually the patch of the thermometer is attached to the surface, the positive electrode and the negative electrode of the lithium battery 4 to monitor the temperature at multiple positions. Therefore, in this embodiment, a wire harness reserved groove 122 is further provided on the heating base 1. The wire harness reserved groove 122 is arranged at the bottom of the first half groove 121 and is communicated with the first half groove 121. When detecting the temperature of the lithium battery 4 through the thermometer, the patch of the thermometer is attached to the positive electrode, the negative electrode and the surface located in the heating channel 5 of the lithium battery 4, so that the patches are dispersed on the lithium battery 4, and further the thermometer can monitor the temperatures at the top, bottom and middle of the lithium battery 4 respectively, ensuring the accuracy of the test results.

[0041] The wire harness reserved groove 122 located at the bottom of the first half groove 121 can supply the wire harness of the thermometer to route when the patches of the thermometer are respectively attached to the positive electrode, the negative electrode and the surface located in the heating channel 5 of the lithium battery 4, so that when performing the thermal runaway test on the lithium battery 4, the routing of the thermometer is more regular, and further the practicability of this test tooling is stronger.

[0042] In this embodiment, there are multiple first half grooves 121 provided on the heating base 1, and multiple second half grooves 221 provided on the heating upper cover 2. One first half groove 121 and one second half groove 221 are combined to form a heating channel 5 for inserting one lithium battery 4. In this application, there are multiple first half grooves 121 provided on the heating base 1, and multiple second half grooves 221 provided on the heating upper cover 2.

[0043] When the heating upper cover 2 and the heating base 1 are connected by the connecting member 3 and combined into an integral structure, each first half groove 121 on the heating base 1 is combined with the corresponding second half groove 221 on the heating upper cover 2 to form a heating channel 5, so that multiple heating channels 5 are formed between the heating base 1 and the heating upper cover 2, which can respectively supply multiple lithium batteries 4 to be inserted. Therefore, this test tooling can perform the thermal runaway test on multiple lithium batteries 4 at the same time, and further greatly improves the test efficiency, making the practicability of this test tooling stronger.

[0044] Specifically, in this embodiment, a first connecting plate 113 is provided on the heating base 1, and a through hole 1131 is provided on the first connecting plate 113. A second connecting plate 213 is provided on the heating upper cover 2. The connecting member 3 includes a screw member 31 and a limit nut 32. The screw member 31 is arranged on the second connecting plate 213. When the heating upper cover 2 is covered on the heating base 1, one end of the screw member 31 arranged on the second connecting plate 213 passes through the through hole 1131 on the first connecting plate 113 and is screwed with the limit nut 32 until the limit nut 32 abuts against the first connecting plate 113, so as to realize the fixed connection between the heating upper cover 2 and the heating base 1 and make the heating upper cover 2 and the heating base 1 combined into an integral structure.

[0045] On the contrary, by screwing the limit nut 32 with one end of the screw member 31 passing through the through hole 1131 in the direction away from the first connecting plate 113 until the limit nut 32 is screwed off from the screw member 31, the heating upper cover 2 can be separated from the heating base 1, and the screw member 31 can be withdrawn from the through hole 1131, thereby realizing the disassembly of the heating upper cover 2 on the heating base 1, and further making the use of this test tooling simpler and more convenient.

[0046] Furthermore, in this embodiment, the top of the screw member 31 is rotatably connected to the second connecting plate 213. A screw inlet and outlet groove 1132 is provided on the first connecting plate 113, and the screw inlet and outlet groove 1132 communicates the through hole 1131 with the outside, so that the middle part of the screw member 31 can enter and exit the through hole 1131 through the screw inlet and outlet groove 1132, and the limit nut 32 is screwed on the bottom of the screw member 31.

[0047] When the heating upper cover 2 is closed on the heating base 1, by rotating the screw member 31 on the second connecting plate 213, the middle part of the screw member 31 enters the through hole 1131 from the screw inlet and outlet groove 1132, and then the limit nut 32 at the bottom of the screw member 31 is screwed with the screw member 31 until the limit nut 32 abuts against the first connecting plate 113, thereby fixedly connecting the heating upper cover 2 and the heating base 1.

[0048] On the contrary, by screwing the limit nut 32 with one end of the screw member 31 passing through the through hole 1131 in the direction away from the first connecting plate 113, so that the limit nut 32 no longer abuts against the first connecting plate 113, and then by rotating the screw member 31 on the second connecting plate 213, the middle part of the screw member 31 is moved out of the through hole 1131 from the screw inlet and outlet groove 1132, the heating upper cover 2 can be separated from the heating base 1, so that it is not necessary to screw the limit nut 32 off from the screw member 31 to realize the disassembly of the heating upper cover 2 on the heating base 1, and further making the use of this test tooling simpler and more convenient and easier to implement.

[0049] Specifically, in actual implementation, a rotating groove can be provided on the second connecting plate 213, and rotating holes are provided on both side walls of the rotating groove. Both ends of the top of the screw member 31 are provided with rotating rods. The two rotating rods at the top of the screw member 31 are respectively rotationally matched with the two rotating holes in the rotating groove, thereby realizing the rotational connection between the screw member 31 and the second connecting plate 213.

[0050] Further, in this embodiment, at least two insertion posts 114 are provided on the heating base 1, and at least two insertion slots 214 are provided on the heating upper cover 2. When the heating upper cover 2 is closed on the heating base 1, at least two insertion posts 114 on the heating base 1 are respectively inserted into at least two insertion slots 214 on the heating upper cover 2. Thus, through the cooperation of at least two insertion posts 114 and at least two insertion slots 214, the closing position of the heating upper cover 2 on the heating base 1 is positioned, which further facilitates the alignment of the screw member 31 on the second connecting plate 213 with the through hole 1131 on the first connecting plate 113, making the use of this test tooling simpler, more convenient, and easier to implement.

[0051] Since there are various sizes of lithium batteries 4, if a set of test tooling is only applicable to lithium batteries 4 of one size, it will result in poor practicality of the test tooling, thereby increasing the test cost. Therefore, in this embodiment, the heating base 1 includes a base main body 11 and a base sleeve 12. The base sleeve 12 is detachably connected to the base main body 11. The first half groove 121 and the wire harness routing groove are provided on the base sleeve 12. The heating upper cover 2 includes an upper cover main body 21 and an upper cover sleeve 22. The upper cover sleeve 22 is detachably connected to the upper cover base. The second half groove 221 is provided on the upper cover sleeve 22.

[0052] In this application, multiple base sleeves 12 and multiple upper cover sleeves 22 can be provided. The first half grooves 121 on the multiple base sleeves 12 are respectively adapted to lithium batteries 4 of different sizes, and the second half grooves 221 on the multiple upper cover sleeves 22 are also respectively adapted to lithium batteries 4 of different sizes. Thus, through the detachable connection between the base sleeve 12 and the base main body 11, and the detachable connection between the upper cover sleeve 22 and the upper cover main body 21, this test tooling can replace the base sleeve 12 with different first half groove 121 sizes and the upper cover sleeve 22 with different second half groove 221 sizes according to lithium batteries 4 of different sizes, so that the heating channel 5 formed by the combination of the first half groove 121 and the second half groove 221 is adapted to lithium batteries 4 of different sizes. Furthermore, this test tooling can be applicable to the thermal runaway tests of lithium batteries 4 of various sizes, enhancing the practicality of this test tooling and reducing the test cost.

[0053] Specifically, in this embodiment, a first installation groove 111 is provided on the base main body 11, and the first installation groove 111 matches the outer contour of the base sleeve 12. A first countersunk hole 123 is provided on the base sleeve 12, and a first threaded hole 112 is provided at the bottom of the first installation groove 111. The heating base 1 further includes a first countersunk bolt 13. When the base sleeve 12 is installed in the first installation groove 111, after the first countersunk bolt 13 penetrates through the first countersunk hole 123 at one end of the top of the base sleeve 12, it is screwed with the first threaded hole 112, thereby realizing the fixed installation of the base sleeve 12 on the base main body 11.

[0054] Conversely, by screwing out the first countersunk bolt 13 from the first threaded hole 112, the base sleeve 12 can be removed from the first mounting groove 111, thereby realizing the disassembly of the base sleeve 12 on the base body 11. It can be foreseen that when this test fixture conducts a thermal runaway test on lithium batteries 4 of different sizes, only the base sleeve 12 is replaced. The base body 11 is unique, and the size of the first mounting groove 111 on the base body 11 is fixed. Therefore, for different base sleeves 12, only the sizes of the first half grooves 121 are different, and the outer dimensions are the same. Thus, the first mounting groove 111 on the base body 11 can be suitable for the installation of different base sleeves 12.

[0055] Similarly, in this embodiment, a second mounting groove 211 is provided on the upper cover body 21, and the second mounting groove 211 matches the outer contour of the upper cover sleeve 22. A second countersunk hole 222 is provided on the upper cover sleeve 22, and a second threaded hole 212 is provided at the bottom of the second mounting groove 211. The heating upper cover 2 further includes a second countersunk bolt 23. When the upper cover sleeve 22 is installed in the second mounting groove 211, after the second countersunk bolt 23 penetrates through the second countersunk hole 222 at one end of the top of the upper cover sleeve 22, it is screwed into the second threaded hole 212, thereby realizing the fixed installation of the upper cover sleeve 22 on the upper cover body 21.

[0056] Conversely, by screwing out the second countersunk bolt 23 from the second threaded hole 212, the upper cover sleeve 22 can be removed from the second mounting groove 211, thereby realizing the disassembly of the upper cover sleeve 22 on the upper cover body 21. It can be foreseen that when this test fixture conducts a thermal runaway test on lithium batteries 4 of different sizes, only the upper cover sleeve 22 is replaced. The upper cover body 21 is unique, and the size of the second mounting groove 211 on the upper cover body 21 is fixed. Therefore, for different upper cover sleeves 22, only the sizes of the second half grooves 221 are different, and the outer dimensions are the same. Thus, the second mounting groove 211 on the upper cover body 21 can be suitable for the installation of different upper cover sleeves 22.

[0057] In this application, the reason for providing the first countersunk hole 123 on the base sleeve 12 and screwing the first countersunk bolt 13 through the first countersunk hole 123 and then screwing it into the first threaded hole 112 to realize the fixed installation of the base sleeve 12 on the base body 11, and providing the second countersunk hole 222 on the upper cover sleeve 22 and screwing the second countersunk bolt 23 through the second countersunk hole 222 and then screwing it into the second threaded hole 212 to realize the fixed installation of the upper cover sleeve 22 on the upper cover body 21 is to prevent the bolts from protruding from the tops of the base sleeve 12 and the upper cover sleeve 22, which may affect the fitting of the heating upper cover 2 and the heating base 1.

[0058] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0059] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A lithium battery thermal runaway test tool, characterized in that: The invention comprises a heating base (1), a heating upper cover (2) and a connecting piece (3), wherein the connecting piece (3) connects the heating base (1) and the heating upper cover (2) so as to enable the heating upper cover (2) to be assembled with the heating base (1); the heating base (1) is provided with a first half groove (121), the heating upper cover (2) is provided with a second half groove (221), the first half groove (121) and the second half groove (221) are assembled to form a heating channel (5) for inserting a lithium battery (4), the inner wall of the heating channel (5) forms a heating surface, and the heating surface is in contact with the outer wall of the lithium battery (4) so ​​as to heat the lithium battery (4).

2. A lithium battery thermal runaway test tool as claimed in claim 1, characterized in that: The heating base (1) is also provided with a wire harness reserved groove (122) for routing a wire harness of a temperature measuring instrument; the wire harness reserved groove (122) is provided at the bottom of the first half groove (121) and is in communication with the first half groove (121).

3. A lithium battery thermal runaway test tool as claimed in claim 1, characterized in that: The heating base (1) comprises a base body (11) and a base sleeve (12) arranged on the base body (11), the base sleeve (12) being detachably connected to the base body (11), and the first half groove (121) being arranged on the base sleeve (12); the heating upper cover (2) comprises an upper cover body (21) and an upper cover sleeve (22) arranged on the upper cover body (21), the upper cover sleeve (22) being detachably connected to the upper cover body (21), and the second half groove (221) being arranged on the upper cover sleeve (22).

4. A lithium battery thermal runaway test tool as claimed in claim 3, characterized in that: The base body (11) is provided with a first mounting groove (111) matching the outer contour of the base sleeve (12), the base sleeve (12) is provided with a first countersunk hole (123), the bottom of the first mounting groove (111) is provided with a first threaded hole (112), and the heating base (1) further comprises a first countersunk bolt (13) with one end passing through the first countersunk hole (123) and being screwed to the first threaded hole (112).

5. A lithium battery thermal runaway test tool as claimed in claim 3, characterized in that: The upper cover body (21) is provided with a second mounting groove (211) matching the outer contour of the upper cover sleeve (22), the upper cover sleeve (22) is provided with a second countersunk hole (222), the bottom of the second mounting groove (211) is provided with a second threaded hole (212), and the heating upper cover (2) further comprises a second countersunk bolt (23) with one end passing through the second countersunk hole (222) and being screwed to the second threaded hole (212).

6. A lithium battery thermal runaway test tool as claimed in claim 1, characterized in that: The heating base (1) is provided with a first connecting plate (113), the heating upper cover (2) is provided with a second connecting plate (213), the first connecting plate (113) is provided with a through hole (1131), the connecting member (3) comprises a screw member (31) provided on the second connecting plate (213), and a limiting nut (32) screwed to the screw member (31), one end of the screw member (31) passes through the through hole (1131) and is screwed to the limiting nut (32).

7. A lithium battery thermal runaway test tool as claimed in claim 6, characterized in that: The top of the screw member (31) is rotatably connected to the second connecting plate (213); the first connecting plate (113) is also provided with a screw entry and exit groove (1132) for connecting the through hole (1131) with the outside; the screw entry and exit groove (1132) is used for allowing the middle part of the screw member (31) to enter and exit the through hole (1131); and the limiting nut (32) is screwed to the bottom of the screw member (31).

8. A lithium battery thermal runaway test fixture as claimed in claim 1, characterized in that: The heating base (1) is provided with at least two plugging posts (114), and the heating upper cover (2) is provided with at least two plugging slots (214); when the heating upper cover (2) and the heating base (1) are assembled, at least two of the plugging posts (114) are respectively plugged into at least two of the plugging slots (214).

9. A lithium battery thermal runaway test tool as claimed in claim 1, characterized in that: The first half grooves (121) are multiple and are arranged on the heating base (1); the second half grooves (221) are multiple and are arranged on the heating upper cover (2); a first half groove (121) and a second half groove (221) are combined to form the heating channel (5) for plugging a lithium battery (4).

10. A lithium battery thermal runaway test tool as claimed in claim 1, characterized in that: The length of the heating channel (5) is less than or equal to the length of the lithium battery (4).

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