A lithium-ion battery adiabatic test device

Abstract

The utility model provides a kind of lithium ion battery adiabatic testing device, it is related to lithium ion battery testing technical field, comprising: box, the upper cover of the box is equipped with cover plate, to form battery accommodating cavity in inside, and the inner wall of the box and the cover plate is equipped with heat insulation layer, the inboard of the heat insulation layer is embedded with heating component;Suction duct, one end is worn in the top of the cover plate and is communicated with the battery accommodating cavity, another end is outwardly extended and is equipped with vacuum valve;Temperature sensor, is applied to the inner wall of the cover plate.Arranged in the suction duct and vacuum valve can be connected to the vacuum pump of outside battery accommodating cavity is evacuated, and because battery accommodating cavity inside is provided with heat insulation layer, effectively improve adiabatic performance;Easy to operate, support simulation adiabatic environment test, low air pressure test, monitor battery temperature, heat battery and other functions;Device volume is small, portable, cost is low, easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery testing technology, and in particular to a lithium-ion battery thermal insulation testing device. Background Technology

[0002] Lithium-ion batteries, as a core component in modern energy storage, have become the preferred power source for electric vehicles, energy storage systems, and portable electronic devices due to their significant advantages such as high specific energy, excellent rate performance, and strong environmental adaptability. However, the potential risk of thermal runaway in lithium-ion batteries remains a key bottleneck restricting their large-scale safe application. When a chain of exothermic reactions is triggered inside the battery due to mechanical, electrical, or thermal abuse, if the heat cannot be dissipated effectively in time, the battery temperature will rise sharply, leading to irreversible reactions such as electrolyte decomposition, separator melting, and short circuits between the positive and negative electrodes. Ultimately, this can result in catastrophic consequences such as battery fire or even explosion. Therefore, accurately assessing the thermal safety of batteries has become an urgent need to ensure the safe operation of lithium-ion batteries throughout their entire life cycle.

[0003] Against this backdrop, battery thermal insulation testing technology has emerged. By constructing a near-insulated experimental environment, it simulates the thermal behavior of batteries under extreme thermal runaway conditions, providing crucial data support for revealing the mechanism of battery thermal runaway and optimizing thermal management strategies. Specifically, the thermal insulation testing device can monitor the temperature change of the battery in an adiabatic environment in real time and simultaneously collect electrochemical parameters such as current and voltage, making it an important means of assessing battery temperature rise and thermal safety.

[0004] Currently, commonly used battery thermal insulation testing equipment mainly includes accelerated calorimeters (ARC) and adiabatic calorimeters (ADC). These devices are widely used and have high data acceptance, but they suffer from drawbacks such as long testing cycles, high equipment costs, large equipment size, complex maintenance, and high professional requirements for operators. Furthermore, it is difficult to simulate a vacuum thermal insulation environment during conventional lithium-ion battery testing.

[0005] Therefore, there is an urgent need to design a thermal insulation testing device that can be operated quickly. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a lithium-ion battery thermal insulation testing device, comprising:

[0007] The housing has a cover plate on top to form a battery housing cavity inside, and the inner walls of both the housing and the cover plate are provided with heat insulation layers, with heating components embedded on the inner side of the heat insulation layers;

[0008] The exhaust pipe has one end inserted through the top of the cover plate and connected to the battery housing cavity, and the other end extends outward and is equipped with a vacuum valve.

[0009] A temperature sensor is installed on the inner wall of the cover plate.

[0010] Preferably, the housing and the cover are fixed together by screws, and a sealing ring is provided at the connection between the housing and the cover.

[0011] Preferably, the interior of the insulation layer is filled with insulation material to form a composite insulation layer.

[0012] Preferably, the heating element is circumferentially embedded in the heat insulation layer on the inner side of the housing.

[0013] Preferably, the heating element is a flexible heating strip.

[0014] Preferably, the power density of the flexible heating belt is 50-200 W / m. 2 .

[0015] Preferably, a vacuum gauge is also installed at the outwardly extending end of the air extraction pipe.

[0016] Preferably, the side wall of the housing is provided with a positive plug and a negative plug, both of which are sealed and waterproof plugs.

[0017] Preferably, the temperature sensor is a multi-channel temperature sensor, and the connecting wires of the multi-channel temperature sensor are led out to the outside through a sealing joint opened on the cover plate.

[0018] Preferably, the side wall of the housing is also provided with a heating interface, which is electrically connected to the heating component.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] 1) Improved thermal insulation performance: By setting up an air extraction pipe and a vacuum valve, an external vacuum pump can be connected to evacuate the battery housing cavity. The operation is convenient and can achieve rapid vacuuming, which improves the testing efficiency while minimizing gas heat conduction. In addition, since a heat insulation layer is set inside the battery housing cavity, the thermal insulation performance is effectively improved, and the thermal conductivity is ≤0.02W / (m·K).

[0021] 2) Multifunctional integration: It supports the simulation of thermal insulation environment and low pressure environment through vacuuming and heat insulation layer. It also integrates temperature sensor and heating component to support monitoring battery temperature and heating battery during battery testing, meeting the needs of multi-scenario testing.

[0022] 3) Cost savings: The device is small in size, portable, low in cost, and easy to operate. Attached Figure Description

[0023] Fig. 1A schematic diagram of the overall structure of a lithium-ion battery thermal insulation testing device is shown in a preferred embodiment of this utility model.

[0024] Fig. 2 This is a schematic diagram of the internal structure of the box in a preferred embodiment of the present invention;

[0025] Fig. 3 This is a schematic diagram of the internal structure of the cover plate in a preferred embodiment of the present invention.

[0026] In the attached image:

[0027] 1. Housing; 2. Cover plate; 3. Insulation layer; 4. Heating component; 5. Evacuation pipe; 6. Vacuum valve; 7. Temperature sensor; 8. Sealing ring; 9. Vacuum gauge; 10. Positive plug; 11. Negative plug; 12. Sealing joint; 13. Heating interface; 14. Screws. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0029] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a lithium-ion battery thermal insulation testing device is provided, such as... Figs. 1 to 3 As shown, it includes:

[0030] The box body 1 has a cover plate 2 on its top to form a battery housing cavity inside. Both the inner walls of the box body 1 and the cover plate 2 are provided with heat insulation layer 3, and a heating element 4 is embedded in the inner side of the heat insulation layer 3.

[0031] The exhaust pipe 5 has one end inserted through the top of the cover plate 2 and connected to the battery housing cavity, and the other end extends outward and is equipped with a vacuum valve 6.

[0032] Temperature sensor 7 is installed on the inner wall of cover plate 2.

[0033] Specifically, in this embodiment, the aforementioned housing 1 and cover 2 are preferably made of materials such as carbon fiber, epoxy resin, plexiglass, aluminum alloy, and steel. By setting up an extraction pipe 5 and a vacuum valve 6, an external vacuum pump can be connected to evacuate the battery housing cavity. Furthermore, because a heat insulation layer 3 is installed inside the battery housing cavity, gas heat conduction is minimized, effectively improving the insulation performance and simulating an adiabatic environment. Moreover, by embedding a heating component 4 and a temperature sensor 7, the lithium-ion battery adiabatic testing device of this invention integrates temperature monitoring and heating functions, and can replace accelerated calorimeters (ARC) and high-temperature chambers to complete battery thermal testing. It can quickly detect the temperature rise of the battery under adiabatic conditions, providing important data for battery thermal simulation, battery / battery pack design, heat dissipation design, and safety assessment.

[0034] In a preferred embodiment of the present invention, the box body 1 and the cover plate 2 are connected and fixed by screws 14, and a sealing ring 8 is provided at the connection between the box body 1 and the cover plate 2.

[0035] In a preferred embodiment of the present invention, the interior of the insulation layer 3 is filled with insulation material to form a composite insulation layer.

[0036] Specifically, in this embodiment, the above-mentioned heat insulation materials include, but are not limited to, aerogel, heat insulation silicone, heat insulation cotton, etc., and the thickness of the heat insulation layer 3 is ≥5mm. The multi-layer composite structure effectively blocks the conduction of environmental heat.

[0037] In a preferred embodiment of the present invention, the heating component 4 is circumferentially embedded in the heat insulation layer 3 on the inner side of the housing 1.

[0038] In a preferred embodiment of this invention, the heating component 4 is a flexible heating strip.

[0039] In a preferred embodiment of this invention, the power density of the flexible heating belt is 50-200 W / m². 2 .

[0040] In a preferred embodiment of the present invention, a vacuum gauge 9 is also installed at the outwardly extending end of the evacuation pipe 5 for real-time monitoring of the vacuum level inside the battery housing cavity.

[0041] In a preferred embodiment of the present invention, a positive plug 10 and a negative plug 11 are embedded in the side wall of the housing 1. Both the positive plug 10 and the negative plug 11 are sealed and waterproof plugs used to connect the internal battery electrode leads.

[0042] In a preferred embodiment of this utility model, the temperature sensor 7 is a multi-channel temperature sensor, including but not limited to thermistors, thermocouples or PT100, etc., and the connecting wire harness of the multi-channel temperature sensor is led out to the outside through the sealing joint 12 opened on the cover plate 2.

[0043] In a preferred embodiment of the present invention, a heating interface 13 is also embedded in the side wall of the housing 1, which is electrically connected to the heating component 4 so that the battery can be heated by the heating component 4 through an external power source.

[0044] Example 1

[0045] The specific heat capacity of a lithium-ion battery can be tested using the thermal insulation testing device of this invention. The specific testing procedure is as follows:

[0046] Two test batteries are stacked in the housing 1, the temperature sensor 7 is fixed on the outer surface of the battery, the flexible heating strip is placed between the two batteries, and the cover plate 2 and the housing 1 are connected and fixed by screws 14.

[0047] Start the vacuum pump and pump to -0.095 kPa (relative vacuum) through vacuum valve 6;

[0048] At this time, the interior of the box 1 is kept in a near-vacuum state, which reduces the impact of air convection on temperature, and the insulation layer 3 can prevent heat dissipation. The interior of the box 1 is considered to be in a near-insulated state.

[0049] The flexible heating element is powered by a constant current source connected to heating interface 13. The output voltage (5V) and current (0.5A) are set, and the battery surface temperature is collected until the upper limit temperature (e.g., 55℃) is reached. The specific heat capacity of the battery can be calculated using parameters such as heating power, temperature rise, and heating time. C = Pt / mΔT, P = UI, and m is the sum of the masses of the two batteries.

[0050] Example 2

[0051] The lithium-ion battery thermal insulation testing device of this invention can be used for thermal insulation testing. The specific testing procedure is as follows:

[0052] Place the test battery into the housing 1, connect the positive and negative electrodes of the battery to the positive plug 10 and the negative plug 11 respectively, fix the temperature sensor 7 on the surface of the battery, and connect and fix the cover plate 2 and the housing 1 with screws 14.

[0053] Start the vacuum pump and pump to -0.095 kPa (relative vacuum) through vacuum valve 6;

[0054] At this time, the interior of the box 1 is kept in a near-vacuum state, which reduces the impact of air convection on temperature, and the insulation layer 3 can prevent heat dissipation. The interior of the box 1 is considered to be in a near-insulated state.

[0055] By using external equipment to test the battery under different rates and operating conditions, and by collecting temperature data through a multi-channel temperature sensor 7, it is possible to test parameters such as temperature rise when the battery is in a near-adiabatic state. Based on the specific heat capacity data, key parameters such as heat generation and heat dissipation power can be calculated.

[0056] Example 3

[0057] The lithium-ion battery thermal insulation testing device of this invention can be used for high-temperature testing. The specific testing procedure is as follows:

[0058] Place the test battery into the housing 1, connect the positive and negative electrodes of the battery to the positive plug 10 and the negative plug 11 respectively, fix the temperature sensor 7 on the surface of the battery, and connect and fix the cover plate 2 and the housing 1 with screws 14.

[0059] The heating interface 13 and the sealing joint 12 are connected to the automatic control system respectively, which are used to supply power for heating and sense the battery temperature. By setting the target temperature, the automatic closed-loop control can raise the temperature of the cavity to 35℃, 45℃, 55℃, 65℃ and other temperatures to conduct high-temperature working condition tests and simulate a high-temperature test chamber.

[0060] Example 4

[0061] The lithium-ion battery thermal insulation testing device of this invention can be used to conduct low-pressure tests. The specific testing procedure is as follows:

[0062] Place the test battery into the housing 1, connect the positive and negative electrodes of the battery to the positive plug 10 and the negative plug 11 respectively, fix the temperature sensor 7 on the surface of the battery, and connect and fix the cover plate 2 and the housing 1 with screws 14.

[0063] Start the vacuum pump and pump to the target vacuum level of -0.046 kPa (relative vacuum level, simulating an altitude of 5000 meters) through vacuum valve 6;

[0064] By using external equipment to test the battery under different rates and operating conditions, and by collecting temperature data through a multi-channel temperature sensor 7, the battery's electrical performance and thermal characteristics under low air pressure / high altitude conditions can be tested.

[0065] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A lithium-ion battery thermal insulation testing device, characterized in that, include: The housing has a cover plate on top to form a battery housing cavity inside, and the inner walls of both the housing and the cover plate are provided with heat insulation layers, with heating components embedded on the inner side of the heat insulation layers; The exhaust pipe has one end inserted through the top of the cover plate and connected to the battery housing cavity, and the other end extends outward and is equipped with a vacuum valve. A temperature sensor is installed on the inner wall of the cover plate.

2. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, The box body and the cover plate are connected and fixed by screws, and a sealing ring is provided at the connection between the box body and the cover plate.

3. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, The interior of the insulation layer is filled with insulation material to form a composite insulation layer.

4. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, The heating element is circumferentially embedded in the heat insulation layer on the inner side of the box.

5. The lithium-ion battery thermal insulation testing device according to claim 1 or 4, characterized in that, The heating element is a flexible heating strip.

6. The lithium-ion battery thermal insulation testing device according to claim 5, characterized in that, The power density of the flexible heating belt is 50-200W / m. 2 .

7. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, A vacuum gauge is also installed at the outward-extending end of the extraction pipe.

8. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, The side wall of the enclosure is fitted with a positive plug and a negative plug, both of which are sealed and waterproof.

9. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, The temperature sensor is a multi-channel temperature sensor, and the connecting wires of the multi-channel temperature sensor are led out to the outside through a sealed connector opened on the cover plate.

10. The lithium-ion battery thermal insulation testing device according to claim 1, characterized in that, The side wall of the housing is also equipped with a heating interface, which is electrically connected to the heating component.

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