Battery pack heat insulation structure of ceramic nanofiber

Abstract

The utility model discloses a ceramic nanofiber battery pack heat insulation structure, and relates to the technical field of battery pack heat insulation, and the ceramic nanofiber battery pack heat insulation structure comprises a fireproof film which is located at the bottom and is in contact with a battery pack, and a steel wire reinforcing layer for improving impact resistance and enhancing bearing capacity is fixedly arranged at the upper part of the fireproof film; the upper portion of the steel wire reinforcing layer is fixedly provided with a heat insulation plate which can stabilize the working environment and reduce temperature fluctuation, the upper portion of the heat insulation plate is fixedly provided with a triangular supporting frame which can enhance structural stability, stabilize heat insulation materials and form a heat insulation space, and the upper portion of the triangular supporting frame is fixedly provided with a vacuum heat insulation bag which is low in heat conductivity and effectively obstructs heat radiation. A partition plate for improving safety and optimizing heat management is fixedly arranged on the upper portion of the vacuum heat insulation bag, and a heat conduction plate capable of optimizing heat management and preventing thermal runaway is fixedly arranged on the upper portion of the partition plate. According to the invention, better fire prevention and heat insulation can be achieved, and the requirements on flame retardance, heat insulation, strength, temperature resistance and the like of the new energy automobile in use can be met.

Description

Technical Field

[0001] The present application relates to the field of battery pack insulation technology, and in particular to a ceramic nanofiber battery pack insulation structure. Background Art

[0002] With the proposal of the carbon neutrality goal, new energy vehicles have developed rapidly due to their carbon neutrality properties. At the same time, due to the advancement of their technology, more and more consumers choose to buy new energy vehicles. The battery of a new energy vehicle is one of the important vehicle components of a new energy vehicle, but the safety problems brought by the batteries used in new energy vehicles have gradually been exposed. Batteries are prone to spontaneous combustion, especially lithium-ion batteries. The spontaneous combustion of batteries poses a serious threat to life and property, and will also affect the further development and popularization of new energy vehicles. In order to solve the problem of battery spontaneous combustion, major automobile manufacturers and battery manufacturers have also carried out a lot of research work. Although certain research results have been achieved, the problem of battery spontaneous combustion has not been completely solved, especially the spontaneous combustion of lithium-ion batteries. After statistical research on the spontaneous combustion cases of lithium-ion batteries, it was found that in most cases when lithium-ion batteries spontaneously combust, a small piece of lithium-ion battery monomer with abnormal performance spontaneously combusts or thermally runs away, which in turn causes the surrounding normal battery monomers to burn, and then causes battery combustion in a larger range. As disclosed in Publication No. CN202220674994.5, the thermal insulation pad and battery pack have the following deficiencies:

[0003] The device achieves the effect of fireproofing and heat insulation by providing a connecting cavity that runs through the thickness of the insulation board and covering the wall of the connecting cavity with a fire extinguishing coating. However, the fireproofing effect of the insulation board is not very ideal, and relying solely on the insulation board and the fire extinguishing coating for fireproofing and heat insulation cannot achieve a good effect, and cannot meet the requirements of new energy vehicles for flame retardancy, heat insulation, strength, temperature resistance, etc. when in use scenarios. Summary of the invention

[0004] In order to achieve better fireproofing and heat insulation, and to meet the requirements of flame retardancy, heat insulation, strength, temperature resistance, etc. for new energy vehicles during use, the present application provides a ceramic nanofiber battery pack insulation structure.

[0005] The present application provides a ceramic nanofiber battery pack insulation structure that adopts the following technical solution:

[0006] A ceramic nanofiber battery pack insulation structure, comprising a fireproof film located at the bottom and in contact with the battery pack, a fireproof film made of ceramic nanofiber material, a steel wire reinforcement layer for improving impact resistance and load-bearing capacity fixedly disposed on the upper portion of the fireproof film, a heat insulation board for stabilizing the working environment and reducing temperature fluctuations fixedly disposed on the upper portion of the steel wire reinforcement layer, a triangular support frame for enhancing structural stability and stabilizing the heat-insulating material and forming a heat-insulating space fixedly disposed on the upper portion of the heat insulation board, a vacuum insulation bag for effectively blocking heat radiation fixedly disposed on the upper portion of the triangular support frame, a partition for improving safety and optimizing thermal management fixedly disposed on the upper portion of the vacuum insulation bag, and a heat conductive plate for optimizing thermal management and preventing thermal runaway fixedly disposed on the upper portion of the partition.

[0007] By adopting the above technical solutions, the fireproof film has a low thermal conductivity, a lighter and thinner material, and a better fireproof and heat-insulating effect. The steel wire reinforcement layer can reduce vibration damage and enhance overall protection. The insulation board can protect the battery life and improve safety. The triangular support frame can disperse the pressure and reduce the single-point force squeezing the insulation space. The vacuum insulation bag can effectively reduce the thermal conductivity because its interior is close to a vacuum state, and the heat conduction plate can quickly export the uncontrolled heat.

[0008] Preferably, a honeycomb panel is provided inside the vacuum insulation bag for supporting and enhancing the thermal insulation performance and dispersing thermal stress.

[0009] By adopting the above technical solution, stress can be effectively dispersed, and it can serve as a supporting structure for the vacuum insulation bag to prevent it from being deformed or damaged by external pressure or impact.

[0010] Preferably, the partition is provided with a plurality of grids arranged in an array and used to divide the temperature into zones, reduce the heat transfer path and prevent the runaway diffusion of heat.

[0011] By adopting the above technical solution, the grid-shaped partition design can modularize the internal space and better realize the zoning control of temperature.

[0012] Preferably, a heat pipe groove is provided on the surface of the heat conducting plate.

[0013] By adopting the above technical solution, the flat heat pipe can be better fixedly connected to the heat conducting plate.

[0014] Preferably, a vacuum port is fixedly provided on one side of the vacuum insulation bag and passes through the partition and the heat conducting plate.

[0015] By adopting the above technical solution, the vacuum insulation bag can be vacuumed without affecting the structure.

[0016] Preferably, a flat heat pipe with good thermal conductivity and capable of making the temperature distribution more uniform is fixedly arranged inside the heat pipe groove.

[0017] By adopting the above technical solution, the heat pipe has a wide operating temperature range and can work normally in the range of -40℃~100℃, which enables the battery pack to maintain good heat dissipation performance even in extreme climatic conditions.

[0018] Preferably, a connecting opening is fixedly provided between each honeycomb groove in the honeycomb panel to connect each honeycomb groove.

[0019] By adopting the above technical solution, a lightweight design can be further performed and heat concentration can be reduced.

[0020] Preferably, the fireproof film is surrounded by raised baffles that cover and fix the steel wire reinforcement layer, the insulation board, the vacuum insulation bag, the honeycomb board, the partition board, and the heat conduction board.

[0021] By adopting the above technical solution, the raised baffles around the fireproof membrane can make the entire structure form a whole and provide better fireproof performance for the entire structure.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] By setting a ceramic nanofiber fireproof film as the first layer close to the battery pack, because the ceramic nanofiber material has low thermal conductivity, high temperature resistance and good fire resistance, plus a steel wire reinforcement layer to provide support for the overall strength, and the squares set on the triangular support frame and the partition provide heat dissipation space, the temperature resistance effect is achieved, and the cooperation of the vacuum insulation bag and the honeycomb panel increases the overall insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an exploded front view of the present application;

[0025] Figure 2 It is a layered rear view of this application;

[0026] Figure 3 It is an overall schematic diagram of this application;

[0027] Figure 4 A side sectional view of the present application;

[0028] Figure 5 This is an enlarged view of the interior of the vacuum insulation bag of this application.

[0029] Figure numerals: 1. fireproof film; 2. steel wire reinforcement layer; 3. insulation board; 4. triangular support frame; 5. vacuum insulation bag; 6. honeycomb panel; 7. partition; 8. heat conduction plate; 9. flat heat pipe; 10. vacuum port; 11. grid; 12. connecting port; 13. heat pipe groove. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0031] The embodiment of the present application discloses a ceramic nanofiber battery pack insulation structure.

[0032] Example 1

[0033] Reference Figure 1-Figure 5 A ceramic nanofiber battery pack insulation structure includes a ceramic fiber fireproof film 1 laid between the bottom of the cabin and the battery pack, and the ceramic fiber fireproof film 1 is provided with raised baffles around it, and the height of the raised baffles is the same as the height of the steel wire reinforcement layer 2, the height of the insulation board 3, the height of the vacuum insulation bag 5, the height of the honeycomb board 6, the height of the partition 7, and the height of the heat conduction board 8, and the raised baffles can completely cover the steel wire reinforcement layer 2, the insulation board 3, the vacuum insulation bag 5, the honeycomb board 6, the partition 7, and the heat conduction board 8. The board 8 is covered and fixed, and the upper surface of the ceramic fiber fireproof film 1 is fixedly arranged with the steel wire reinforcement layer 2, and the steel wire reinforcement layer 2 can improve the overall impact resistance and enhance the load-bearing capacity, and the upper surface of the steel wire reinforcement layer 2 is fixedly arranged with the insulation board 3, and the insulation board 3 has the function of stabilizing the working environment and reducing temperature fluctuations, and the upper surface of the insulation board 3 is fixedly arranged with the triangular support frame 4, and the triangular support frame 4 has the function of enhancing structural stability and stabilizing the insulation material and forming an insulation space (such as Figure 4 as shown).

[0034] The upper surface of the triangular support frame 4 is fixedly provided with the vacuum insulation bag 5, and the vacuum insulation bag 5 has a low thermal conductivity and can effectively block thermal radiation, and the interior of the vacuum insulation bag 5 is provided with a honeycomb panel 6 for support, and the honeycomb panel 6 can enhance the thermal insulation performance and disperse the thermal stress, and each honeycomb groove in the honeycomb panel 6 is fixedly penetrated with a connecting port 12, and each connecting port 12 can connect each honeycomb groove, thereby achieving a design that reduces thermal stress concentration and is lightweight (such as Figure 5 As shown), a vacuum port 10 is fixedly provided on one side of the vacuum insulation bag 5, and the vacuum port 10 is fixedly penetrated with one side of the partition 7 and the heat conducting plate 8, and the upper surface of the vacuum insulation bag 5 is fixedly provided with the partition 7, and the partition 7 has the function of improving safety and optimizing thermal management, and a plurality of squares 11 are opened on the partition 7, and the plurality of squares 11 are arranged in an array, and the plurality of squares 11 are used to realize zoned temperature control, and can reduce the path of heat transfer and prevent the runaway diffusion of heat.

[0035] The upper surface of the partition 7 is fixedly arranged with the heat conducting plate 8, and the heat conducting plate 8 has the function of optimizing thermal management and preventing thermal runaway, and a heat pipe groove 13 is opened on the surface of the heat conducting plate 8, and the heat pipe groove 13 passes through the heat conducting plate 8, and the inner surface of the heat pipe groove 13 is fixedly connected with the flat heat pipe 9, and then the flat heat pipe 9 is fixedly passed through the heat conducting plate 8 like the heat pipe groove 13, and the flat heat pipe 9 not only has good thermal conductivity, but also can make the temperature distribution more uniform, and the shape and size can be customized according to needs.

[0036] The fireproof film 1 made of ceramic fiber material has a high melting point and excellent thermal stability, as well as high strength and toughness, and also has excellent fire retardant properties. It can effectively prevent the spread of fire when a fire occurs in the battery pack. When the temperature inside the battery pack rises abnormally, the ceramic nanofiber membrane can quickly dissipate or isolate the heat to prevent the battery from thermal runaway, explosion and other safety accidents, thereby protecting the safety of the vehicle and passengers. Therefore, the fireproof film 1 made of ceramic fiber material can significantly improve the thermal insulation performance, mechanical strength and safety of the battery, and also has the advantages of lightweight design and environmental protection and pollution-free.

[0037] The steel wire reinforcement layer 2 can significantly improve the overall impact resistance and increase the load-bearing capacity, and can also assist in heat dissipation and absorb part of the vibration energy generated by the vibration and impact generated during vehicle driving, thereby reducing damage to the internal structure of the battery pack, extending the service life of the battery pack, and maintaining the stability of the structure.

[0038] The heat insulation board 3 can provide a stable working environment and effectively isolate the external high temperature environment to prevent heat from being transferred to the inside of the battery module, thereby keeping the battery within a suitable operating temperature range, which helps to reduce problems such as unstable performance or shortened life of the battery due to excessively high or low temperature.

[0039] The triangular support frame 4 can significantly improve the overall structural stability, thermal insulation effect, safety and adaptability, and can stabilize the thermal insulation material so that the thermal insulation material can better exert its thermal insulation performance, while forming an insulating space, thereby blocking the transfer of heat and improving the overall thermal insulation effect.

[0040] The vacuum insulation bag 5, the honeycomb panel 6, and the connecting port 12 that connects the honeycomb grooves in the honeycomb panel 6 can significantly improve the thermal insulation performance. The key reason why the vacuum insulation bag 5 can effectively insulate is that its interior is close to a vacuum state, which makes the thermal conductivity of the gas much lower than that of conventional air, thereby significantly reducing the transfer of heat. In addition to reducing heat conduction, the vacuum insulation bag 5 can also block heat radiation to a certain extent, creating a more stable thermal environment inside the battery pack, and the honeycomb panel 6 can assist in improving thermal insulation performance, improving structural stability, optimizing space utilization, and improving safety, etc., and through the connecting port 12, it brings about the effect of enhancing heat dissipation performance and optimizing temperature distribution.

[0041] The heat conducting plate 8 and the flat heat pipe 9 can achieve the effects of efficient heat dissipation and temperature balance, prevent thermal runaway and reduce the diffusion speed and range of thermal runaway, and the flat heat pipe 9 can bring many advantages such as efficient heat dissipation, good temperature balance performance, improved safety, and strong adaptability.

[0042] Dividing the partition 7 into a plurality of grids 11 can achieve zoned temperature control, thereby improving the efficiency of heat dissipation.

[0043] The implementation principle of a ceramic nanofiber battery pack insulation structure in an embodiment of the present application is as follows: by laying the structure between the battery pack and the cabin, the battery pack is insulated. At this time, the fireproof film 1 made of the first layer of ceramic nanofiber material can perform the insulation of the first layer, and can prevent the spread of fire when a fire is caused by thermal runaway, thereby buying time for escape. The second layer of steel wire reinforcement layer 2 can assist in heat dissipation and provide support for the stability of the overall structure. The insulation board 3 located on the third layer can provide a stable environment for the battery, thereby enhancing the service life of the battery. The triangular support frame 4 can form an insulating space to block the transfer of heat to the battery. The vacuum insulation bag 5 can reduce the transfer of heat and reduce heat conduction. The heat conducting plate 8 and the flat heat pipe 9 can quickly export the runaway heat to balance the temperature.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A ceramic nanofiber battery pack insulation structure, characterized in that: The invention comprises a fireproof film (1) made of ceramic nanofiber material and located at the bottom and in contact with the battery pack; a steel wire reinforcement layer (2) for improving impact resistance and load-bearing capacity is fixedly provided on the upper part of the fireproof film (1); a heat insulation board (3) for providing a stable working environment and reducing temperature fluctuations is fixedly provided on the upper part of the steel wire reinforcement layer (2); a triangular support frame (4) for enhancing structural stability and stabilizing the heat insulation material and forming a heat insulation space is fixedly provided on the upper part of the heat insulation board (3); a vacuum insulation bag (5) for effectively blocking heat radiation is fixedly provided on the upper part of the triangular support frame (4); a partition (7) for improving safety and optimizing heat management is fixedly provided on the upper part of the vacuum insulation bag (5); and a heat conduction plate (8) for optimizing heat management and preventing thermal runaway is fixedly provided on the upper part of the partition (7).

2. The thermal insulation structure of a battery pack of ceramic nanofibers according to claim 1, characterized in that: The vacuum insulation bag (5) is provided with a honeycomb panel (6) inside for supporting and enhancing the thermal insulation performance and dispersing thermal stress.

3. The thermal insulation structure of a battery pack of ceramic nanofibers according to claim 1, characterized in that: The partition (7) is provided with a plurality of grids (11) arranged in an array and used to divide the temperature into zones, reduce the path of heat transfer and prevent runaway heat diffusion.

4. The thermal insulation structure of a battery pack of ceramic nanofibers according to claim 1, characterized in that: The surface of the heat conducting plate (8) is provided with a heat pipe groove (13) extending therethrough.

5. The thermal insulation structure of a ceramic nanofiber battery pack according to claim 1, characterized in that: A vacuum port (10) is fixedly provided on one side of the vacuum insulation bag (5) and passes through the partition plate (7) and the heat conducting plate (8).

6. The thermal insulation structure of a battery pack of ceramic nanofibers according to claim 4, characterized in that: A flat heat pipe (9) having good thermal conductivity and capable of making the temperature distribution more uniform is fixedly arranged inside the heat pipe groove (13) and runs through it.

7. The thermal insulation structure of a battery pack of ceramic nanofibers according to claim 2, characterized in that: A connecting port (12) is fixedly provided between each honeycomb groove in the honeycomb plate (6) to connect each honeycomb groove.

8. The ceramic nanofiber battery pack insulation structure according to claim 1, characterized in that: The fireproof film (1) is provided with raised baffles around it, which cover and fix the steel wire reinforcement layer (2), the insulation board (3), the vacuum insulation bag (5), the honeycomb board (6), the partition board (7), and the heat conduction board (8).

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