Auxiliary device for thermal runaway test of secondary battery
By designing a secondary battery thermal runaway test auxiliary device including a clamp, a heating assembly, a temperature measurement assembly and a telescopic fixing assembly, the problem of inaccurate experimental results caused by the instability of the fixation of electric heating wires and thermocouples in the prior art is solved, and the efficient and accurate test results are achieved.
Patent Information
- Application Number
- CN202421332855.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-12
AI Technical Summary
In the current secondary battery thermal runaway test, the fixing method of the electric heating wire and the thermocouple leads to inaccurate experimental results, and errors caused by position changes in parallel tests are difficult to avoid.
An auxiliary device including a clamping plate, a heating assembly, a temperature measuring assembly and a telescopic fixing assembly is designed to ensure that the heating assembly and the temperature measuring assembly are closely fitted with the secondary battery surface through the clamping force adjustment of the clamping plate and the adjustment of the telescopic fixing assembly.
It reduces the pre-test preparation work, ensures consistency of heating and temperature measurement positions, reduces errors caused by position changes, and improves the accuracy and repeatability of the test.
Smart Images
Figure CN222866839U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an auxiliary device in the field of secondary battery thermal runaway test. Background Art
[0002] In the scientific research of fire mechanism and safety performance testing of secondary batteries (such as lithium-ion batteries), it is necessary to conduct thermal runaway tests on secondary batteries. Usually, an accelerated adiabatic calorimeter is used to conduct thermal runaway tests on batteries. The test process requires a lot of preliminary preparation work, including the arrangement of electric heating wires and thermocouples on the surface of the secondary battery. The arrangement of the electric heating wires and thermocouples will directly affect the test results. During the thermal runaway test of the secondary battery, the internal electrolyte evaporates and decomposes, causing the battery to swell, which in turn causes the battery cell to separate from the outer shell, resulting in low temperature measurement of the surface thermocouple, affecting the accuracy of the test results.
[0003] In existing secondary battery thermal runaway tests, aluminum foil tape is usually used to fix the electric heating wire and thermocouple. Not only does it take a lot of time to prepare in the early stage of the experiment, but it is also difficult to avoid errors caused by changes in the positions of the thermocouple and the heating wire in parallel tests. In addition, due to the poor mechanical strength of the aluminum foil tape, the temperature measurement error caused by battery swelling cannot be avoided during the thermal runaway test. Therefore, there is an urgent need in this field for an efficient and accurate experimental auxiliary device that can avoid the above problems. Utility Model Content
[0004] In order to make up for the deficiencies of the above-mentioned prior art, the utility model proposes a secondary battery thermal runaway test auxiliary device.
[0005] The utility model adopts the following technical solutions:
[0006] A secondary battery thermal runaway test auxiliary device comprises two clamping plates, a heating component, a temperature measuring component and a retractable fixing component, wherein the heating component and the temperature measuring component are fixed on the inner surfaces of the two clamping plates, and the retractable fixing component connects the two clamping plates and is used to adjust the clamping force of the two clamping plates, so that when the secondary battery thermal runaway test is carried out, the two clamping plates clamp the secondary battery to be tested with a predetermined clamping force, and the heating component and the temperature measuring component on the inner surfaces of the two clamping plates are both in contact with two opposite surfaces of the secondary battery.
[0007] Preferably, a heating component installation groove and a temperature measuring component installation groove are provided on the inner surface of the clamping plate, the heating component is installed in the heating component installation groove, and the temperature measuring component is installed in the temperature measuring component installation groove.
[0008] Preferably, the heating assembly on the inner surface of each of the splints includes two electric heating plates and a connecting wire, the two electric heating plates are arranged side by side in the heating assembly mounting groove, the middle section of the connecting wire is arranged in the heating assembly mounting groove and is used to connect the two electric heating plates in series, and both ends of the connecting wire extend out of the splint for connecting to an accelerated adiabatic calorimeter used in a secondary battery thermal runaway test.
[0009] Preferably, the temperature measuring component on the inner surface of each of the clamping plates is located between the two electric heating plates, and the temperature measuring component comprises a thermocouple and a thermocouple shell tube, the thermocouple shell tube is installed in the temperature measuring component installation groove, one side of the thermocouple shell tube is a plane to fit with the surface of the secondary battery, the main body of the thermocouple is installed in the thermocouple shell tube, and the end of the thermocouple extends out of the clamping plate for connection to an accelerated adiabatic calorimeter used in a secondary battery thermal runaway test.
[0010] Preferably, the retractable fixing assembly is a retractable fixing bolt, including a bolt, a buckle, a spring and a nut, the bolt passes through the two clamps, the buckle is sleeved on the bolt, the spring is sleeved on the bolt and connected to the buckle, and the nut is sleeved on the bolt and connected to the spring to adjust the length of the spring and thus adjust the tightness of the inner surfaces of the two clamps clamping the secondary battery.
[0011] Preferably, there are four retractable fixing components, which are distributed at the four corners of the splint.
[0012] Preferably, both of the two clamps have a fixing bolt limiting groove, one end of the bolt is detachably mounted in the fixing bolt limiting groove of one of the clamps, the other end of the bolt passes through the two clamps and extends out of the other clamp, and the buckle sleeve is arranged on a section of the bolt extending out of the other clamp and is detachably mounted in the fixing bolt limiting groove on the other clamp.
[0013] Preferably, the fixing bolt limiting groove is cross-shaped, one end of the bolt is a first cross-shaped positioning pin matching the cross shape of the fixing bolt limiting groove, one end of the buckle is a second cross-shaped positioning pin matching the cross shape of the fixing bolt limiting groove, and the other end of the buckle is a fixing groove for fixing the spring.
[0014] Preferably, the clamping plate is made of thermally inert material.
[0015] The beneficial effects of the utility model compared with the prior art include: the secondary battery thermal runaway test auxiliary device of the utility model includes a splint, a heating component, a temperature measuring component and a retractable fixing component. Through their mutual connection and coordination, the workload of arranging the heating component and the temperature measuring component in the early stage of the secondary battery thermal runaway test is reduced, and the consistency of the secondary battery heating position and the temperature measuring position in parallel tests can be ensured, reducing the test error caused by changes in the heating and temperature measuring positions. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the front of the secondary battery thermal runaway test auxiliary device according to a preferred embodiment of the utility model;
[0017] Figure 2 It is a schematic diagram of the back of the secondary battery thermal runaway test auxiliary device according to a preferred embodiment of the utility model;
[0018] Figure 3 This is an exploded schematic diagram of a secondary battery thermal runaway test auxiliary device according to a preferred embodiment of the utility model;
[0019] Figure 4 A schematic diagram of the inner surface of a splint according to a preferred embodiment of the utility model;
[0020] Figure 5 A schematic diagram of the outside of a splint according to a preferred embodiment of the utility model;
[0021] Figure 6 A schematic diagram of a heating assembly according to a preferred embodiment of the present invention;
[0022] Figure 7 This is a schematic diagram of a temperature measurement component according to a preferred embodiment of the present utility model;
[0023] Figure 8 It is a schematic diagram of a retractable fixing assembly according to a preferred embodiment of the utility model. DETAILED DESCRIPTION
[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is further described below with reference to the accompanying drawings and in combination with preferred embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.
[0025] It should be noted that the directional terms such as left, right, up, down, top, and bottom in this embodiment are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.
[0026] See also Figures 1 to 8, is a secondary battery thermal runaway test auxiliary device according to a specific embodiment of the utility model, comprising two clamping plates 10 for clamping a secondary battery 50 (such as a lithium-ion battery), a heating component 20, a temperature measuring component 30 and a retractable fixing component 40, wherein the inner surfaces of the two clamping plates 10 (from the perspective of the figure, in this example, the inner surfaces of the two clamping plates 10 refer to the top surface of the lower clamping plate 10 and the bottom surface of the upper clamping plate 10) are fixed with the heating component 20 and the temperature measuring component 30, and the retractable fixing component 40 connects the two clamping plates 10 and is used to adjust the clamping force of the two clamping plates 10, so that when the secondary battery 50 is tested, the heating component 20 and the temperature measuring component 30 are fixed to the inner surfaces of the two clamping plates 10. During the battery thermal runaway test, the secondary battery 50 to be tested is placed between the two clamps 10. The two clamps 10 clamp the secondary battery 50 with a predetermined clamping force under the action of the retractable fixing component 40, and the heating component 20 and the temperature measuring component 30 on the inner surfaces of the two clamps 10 are both in contact with the two opposite surfaces of the secondary battery 50 (from the perspective of the figure, in this example, the top and bottom surfaces of the secondary battery 50). The heating component 20 is used to perform programmed temperature increase heating on the secondary battery 50 during the thermal runaway test, and the temperature measuring component 30 is used to collect the temperature of the secondary battery 50 during the thermal runaway test.
[0027] In a preferred embodiment, a heating component mounting groove 11 and a temperature measuring component mounting groove 12 are provided on the inner surface of the clamping plate 10, the heating component 20 is installed in the heating component mounting groove 11, and the temperature measuring component 30 is installed in the temperature measuring component mounting groove 12, so as to realize fast and accurate positioning and fast installation of the heating component 20 and the temperature measuring component 30.
[0028] In a preferred embodiment, further reference is made to Figure 6 The heating assembly 20 on the inner surface of each of the clamping plates 10 includes two electric heating plates 21 and a connecting line 22, the two electric heating plates 21 are arranged side by side in the heating assembly installation groove 11, the middle section of the connecting line 22 is arranged in the heating assembly installation groove 11 and connects the two electric heating plates 21 in series, and both ends of the connecting line 22 extend out of the clamping plate 10 for connecting to an accelerated adiabatic calorimeter used in a secondary battery thermal runaway test. The two electric heating plates 21 connected in series on each clamping plate 10 are connected to the accelerated adiabatic calorimeter through the connecting line 22 for uniformly heating the secondary battery 50 during a programmed temperature rise process. The resistance and power of the electric heating plates 21 used in this embodiment meet the heating control specification requirements specified by the accelerated adiabatic calorimeter in the secondary battery thermal runaway test.
[0029] In a preferred embodiment, further reference is made to Figure 7The temperature measuring assembly 30 on the inner surface of each of the clamping plates 10 is located between the two electric heating plates 21, and the temperature measuring assembly 30 includes a thermocouple 31 and a thermocouple shell tube 32. The thermocouple shell tube 32 is used to protect the thermocouple 31. The thermocouple shell tube 32 is installed in the temperature measuring assembly installation groove 12. One side of the thermocouple shell tube 32 is a plane (in this example, the thermocouple shell tube 32 is a hollow metal tube with a plane on one side) to closely contact and fit with the surface of the secondary battery 50. The main body of the thermocouple 31 is installed in the thermocouple shell tube 32, and the end of the thermocouple 31 extends out of the clamping plate 10 for connecting to an accelerated adiabatic calorimeter used in a secondary battery thermal runaway test, and is used to collect the surface temperature of both sides of the secondary battery 50. The specifications and parameters of the thermocouple 31 meet the test requirements of the secondary battery thermal runaway test.
[0030] In a preferred embodiment, further reference is made to Figure 8 The retractable fixing assembly 40 is a retractable fixing bolt, including a bolt 41, a buckle 42, a spring 43 and a nut 44. The bolt 41 passes through the two clamps 10. The buckle 42 is sleeved on the bolt 41. The spring 43 is sleeved on the bolt 41 and connected to the buckle 42. The nut 44 is sleeved on the bolt 41 and connected to the spring 43 to adjust the length of the spring 43 to adjust the tightness of the inner surface of the two clamps clamping the secondary battery, that is, to adjust the clamping force of the two clamps 10. In the secondary battery thermal runaway test, the cooperation of the spring 43, the buckle 42 and the nut 44 plays a role in stress compensation and buffering, so as to achieve uniform stress on the secondary battery 50. The degree of tightening ensures that the heating assembly 20 and the temperature measuring assembly 30 are closely fitted with the secondary battery 50 to be tested, and also ensures the corresponding functions of the clamp 10, the heating assembly 20 and the temperature measuring assembly 30 in the complete thermal runaway state, so as to improve the accuracy and safety of the test.
[0031] In a preferred embodiment, there are four retractable fixing components 10 , which are distributed at the four corners of the clamping plate 10 .
[0032] In a preferred embodiment, both of the two splints 10 have a fixing bolt limiting groove 13, one end of the bolt 41 is detachably mounted in the fixing bolt limiting groove 13 of one of the splints (in this case, the lower splint 10), the other end of the bolt 41 passes through the two splints 10 from the fixing bolt limiting groove 13 and extends out of the other splint (in this case, the upper splint 10), the buckle 42 is sleeved on a section of the bolt 41 extending out of the other splint (in this case, the upper splint 10) and is detachably mounted in the fixing bolt limiting groove 13 on the other splint (in this case, the upper splint 10).
[0033] In a preferred embodiment, the fixing bolt limiting groove 13 is cross-shaped, and a hole is set at the center position for the bolt 41 to pass through to fix the splint 10, one end of the bolt 41 is a first cross-shaped positioning pin 45 matching the cross shape of the fixing bolt limiting groove 13, the first cross-shaped positioning pin 45 is installed in the fixing bolt limiting groove 13 of the splint 10, and is used to fix the retractable fixing assembly 40 on the splint 10 below, one end of the buckle 42 is a second cross-shaped positioning pin 421 matching the cross shape of the fixing bolt limiting groove 13, the second cross-shaped positioning pin 421 is installed in the fixing bolt limiting groove 13 of the upper splint 10, the other end of the buckle 42 is a fixing groove 422 for fixing the spring 43, and the spring 43 is installed on the outside of the fixing groove 422 of the buckle 42 when it is mounted on the bolt 41.
[0034] In a preferred embodiment, the splint 10 is made of a thermally inert material (such as mica), which can avoid temperature measurement errors caused by battery swelling during the thermal runaway test and test errors caused by heat absorption by non-thermally inert materials, further improving the efficiency and accuracy of the secondary battery thermal runaway test.
[0035] In the embodiment of the utility model, when conducting a thermal runaway test of a secondary battery, the upper and lower surfaces of the secondary battery 50 are clamped by the two clamping plates 10 on which the heating component 20 and the temperature measuring component 30 have been installed, the plane of the thermocouple shell tube 32 in the temperature measuring component 30 is in close contact with the center of the secondary battery 50, and the electric heating plate 31 of the temperature measuring component 30 is in close contact with the surface of the secondary battery 50, so that the secondary battery 50 is heated evenly and the temperature is measured accurately during the thermal runaway test, and the heating method, heating position and temperature measuring position can be kept completely consistent in multiple parallel experiments, thereby reducing test errors and improving the accuracy and repeatability of the test.
[0036] Furthermore, in the embodiment of the utility model, four retractable fixing components 40 are used to fasten the two clamping plates 10 that clamp the secondary battery 50, and the bolts 41 and the positioning pins on the buckle 42 cooperate with the fixing bolt limit groove 13 of the clamping plate 10 to realize the rapid and accurate installation of the heating component 20 and the temperature measuring component 30 in the preliminary preparation work of the thermal runaway experiment of the secondary battery 50; and the retractable fixing component 40 can fasten the secondary battery 50 through the clamping plate 10 to prevent the surface temperature collection of the secondary battery 50 from causing errors due to swelling during the thermal runaway test; further, the spring 43 plays a role of stress compensation and buffering under the cooperation of the buckle 42 and the nut 44, thereby realizing that the secondary battery 50 is uniformly stressed in the thermal runaway test of the secondary battery, maintaining the close fit between the heating component 20 and the temperature measuring component 30 and the secondary battery 50, and ensuring that the clamping plate 10, the heating component 20 and the temperature measuring component 30 play their corresponding roles in the complete thermal runaway state, so as to improve the accuracy and safety of the test.
[0037] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For technicians in the technical field to which the present invention belongs, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.
Claims
1. A secondary battery thermal runaway test auxiliary device, characterized in that: It includes two clamping plates, a heating component, a temperature measuring component and a retractable fixing component, wherein the heating component and the temperature measuring component are fixed on the inner surfaces of the two clamping plates, and the retractable fixing component connects the two clamping plates and is used to adjust the clamping force of the two clamping plates, so that when a secondary battery thermal runaway test is carried out, the two clamping plates clamp the secondary battery to be tested with a predetermined clamping force, and the heating component and the temperature measuring component on the inner surfaces of the two clamping plates are both in contact with two opposite surfaces of the secondary battery.
2. The secondary battery thermal runaway test auxiliary device according to claim 1, characterized in that: A heating component installation groove and a temperature measuring component installation groove are arranged on the inner surface of the clamping plate, the heating component is installed in the heating component installation groove, and the temperature measuring component is installed in the temperature measuring component installation groove.
3. The secondary battery thermal runaway test auxiliary device according to claim 2, characterized in that: The heating assembly on the inner surface of each of the splints includes two electric heating plates and a connecting wire. The two electric heating plates are arranged side by side in the heating assembly installation groove. The middle section of the connecting wire is arranged in the heating assembly installation groove and is used to connect the two electric heating plates in series. Both ends of the connecting wire extend out of the splint for connecting to an accelerated adiabatic calorimeter used in a secondary battery thermal runaway test.
4. The secondary battery thermal runaway test auxiliary device according to claim 3, characterized in that: The temperature measuring component on the inner surface of each of the clamping plates is located between the two electric heating plates. The temperature measuring component includes a thermocouple and a thermocouple shell tube. The thermocouple shell tube is installed in the temperature measuring component installation groove. One side of the thermocouple shell tube is a plane to fit with the surface of the secondary battery. The main body of the thermocouple is installed in the thermocouple shell tube. The end of the thermocouple extends out of the clamping plate for connection to an accelerated adiabatic calorimeter used in a secondary battery thermal runaway test.
5. The secondary battery thermal runaway test auxiliary device according to claim 1, characterized in that: The retractable fixing assembly is a retractable fixing bolt, including a bolt, a buckle, a spring and a nut. The bolt passes through the two clamps, the buckle is sleeved on the bolt, the spring is sleeved on the bolt and connected to the buckle, and the nut is sleeved on the bolt and connected to the spring to adjust the length of the spring and adjust the tightness of the inner surfaces of the two clamps to clamp the secondary battery.
6. The secondary battery thermal runaway test auxiliary device according to claim 5, characterized in that: There are four retractable fixing components, which are distributed at the four corners of the clamping plate.
7. The secondary battery thermal runaway test auxiliary device according to claim 5 or 6, characterized in that: Both of the two clamps are provided with a fixing bolt limiting groove, one end of the bolt is detachably mounted in the fixing bolt limiting groove of one of the clamps, the other end of the bolt passes through the two clamps and extends out of the other clamp, and the buckle sleeve is arranged on a section of the bolt extending out of the other clamp and is detachably mounted in the fixing bolt limiting groove on the other clamp.
8. The secondary battery thermal runaway test auxiliary device according to claim 7, characterized in that: The fixing bolt limiting groove is cross-shaped, one end of the bolt is a first cross-shaped positioning pin matching the cross shape of the fixing bolt limiting groove, one end of the buckle is a second cross-shaped positioning pin matching the cross shape of the fixing bolt limiting groove, and the other end of the buckle is a fixing groove for fixing the spring.
9. The secondary battery thermal runaway test auxiliary device according to claim 1, characterized in that: The clamping plate is made of thermally inert material.