Nano-plate and mica composite heat insulation sheet for lithium battery thermal runaway fire prevention
By setting nanoporous insulation plates between mica sheets, the problem of high thermal conductivity of mica sheets is solved, achieving high insulation and low thermal conductivity to prevent thermal runaway fires in lithium-ion batteries, extending battery life and improving safety.
Patent Information
- Application Number
- CN202423137590.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-19
AI Technical Summary
The high thermal conductivity of existing lithium-ion battery mica sheets results in poor thermal insulation performance and an inability to effectively manage thermal runaway between cells.
A nanoporous insulation board is combined with mica sheets and fixed together with an adhesive to form a nano-board mica composite insulation sheet. The excellent thermal insulation properties of the nanoporous insulation board are utilized to reduce the thermal conductivity.
It improves the battery's thermal insulation performance, slows down the propagation of thermal runaway, extends battery life, and enhances safety.
Smart Images
Figure CN223607211U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of composite insulation sheet processing technology, specifically to a nano-plate mica composite insulation sheet for fire prevention in lithium battery thermal runaway. Background Technology
[0002] As an energy carrier capable of converting chemical energy into electrical energy, lithium-ion batteries are widely used in new energy vehicles, energy storage grids, aerospace, and other fields due to their advantages such as high operating voltage, high specific energy, and long cycle life. However, in recent years, fires and explosions involving lithium-ion batteries have become increasingly common, especially in new energy vehicles and energy storage. To meet the demands of operating voltage and power, hundreds of cells are often connected in series and parallel for centralized use. In this situation, if a cell in the battery module experiences thermal runaway, it may lead to thermal runaway of the entire battery module, ultimately causing a fire or explosion of the entire battery system.
[0003] Currently, OEMs primarily use mica sheets to prevent battery thermal runaway. This is because mica sheets are resistant to high-temperature flame impact, and they are highly insulating, acid and alkali resistant, easy to process, and inexpensive, making them highly favored by OEMs. Currently, OEMs mainly use single-layer or multi-layer composite mica sheets. Although mica sheets have many advantages, their high thermal conductivity and poor insulation performance lead to poor thermal runaway management between battery cells. To address this issue, we have designed a high-temperature resistant, low-thermal-conductivity, highly insulating, and easily processable nano-mica composite insulation sheet. Utility Model Content
[0004] The purpose of this invention is to provide a nano-mica composite insulation sheet, which solves the problem in the background art that the mica sheet itself has a high thermal conductivity and poor thermal insulation performance, resulting in poor thermal runaway management between battery cells.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a nano-plate mica composite insulation sheet for fire prevention in lithium battery thermal runaway, comprising a composite component, characterized in that: the composite component includes a first mica sheet, one side of the first mica sheet is coated with a first adhesive, a nano-microporous insulation board is fixedly connected to the side of the first mica sheet by the first adhesive, a second adhesive is coated on the side of the nano-microporous insulation board away from the first adhesive, a second mica sheet is fixedly connected to the side of the nano-microporous insulation board away from the first adhesive by the second adhesive, and adhesive tape is attached to the edge of the composite component.
[0006] Preferably, the thickness of both the first mica sheet and the second mica sheet is 0.1 mm to 0.5 mm.
[0007] Preferably, both the first mica sheet and the second mica sheet are phlogopite mica sheets.
[0008] As a preference, the adhesives of the first adhesive and the second adhesive can use heat-absorbing glue, fire-retardant glue or expandable glue above 200 DEG C.
[0009] As a preference, the thickness of the nano-microporous heat insulation plate is 0.5mm-5mm.
[0010] As a preference, the adhesive tape can use PI adhesive tape, acetic acid cloth adhesive tape or PET adhesive tape.
[0011] As a preference, the width of the adhesive tape is greater than the thickness of the composite assembly, and the adhesive tape is used to encapsulate the composite assembly edge completely by a taping machine.
[0012] Compared with the prior art, the above technical scheme has the following technical effects:
[0013] The utility model discloses a nano-microporous heat insulation plate is arranged between two mica sheets, and the mica sheet and the nano-microporous heat insulation plate are fixedly connected by using adhesive, utilizes the excellent heat insulation characteristic of nano-microporous heat insulation plate, solved the problem of mica sheet's own high thermal conductivity, poor heat insulation performance. DRAWINGS
[0014] Figure 1 It is the cross section schematic view of the utility model;
[0015] Figure 2 It is the structure schematic view of the utility model;
[0016] Figure 3 It is the cold face temperature test graph of the utility model.
[0017] Mark explanation: 1, first mica sheet;2, first adhesive;3, nano-microporous heat insulation plate;4, second adhesive;5, second mica sheet;6, adhesive tape. CONCRETE IMPLEMENTING METHOD
[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.
[0019] It is to be understood that the structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technology.
[0020] Please refer to Figures 1-2 The utility model provides a technical scheme: a kind of nanometer plate mica composite heat insulation sheet for lithium battery thermal runaway fire prevention, it include composite component, composite component includes first mica sheet 1, first mica sheet 1 one side is coated with first adhesive 2, the side surface of first mica sheet 1 is fixedly connected with nanometer microporous heat insulation plate 3 by first adhesive 2, the side away from first adhesive 2 of nanometer microporous heat insulation plate 3 is coated with second adhesive 4, the side away from first adhesive 2 of nanometer microporous heat insulation plate 3 is fixedly connected with second mica sheet 5 by second adhesive 4, the edge of composite component is pasted with adhesive tape 6.
[0021] The thickness of the first mica sheet 1 and the second mica sheet 5 is 0.1mm~0.5mm.
[0022] The first mica sheet 1 and the second mica sheet 5 are both gold mica sheets.
[0023] The adhesive of the first adhesive 2 and the second adhesive 4 can use heat-absorbing glue, fire-retardant glue or expandable glue above 200℃.
[0024] The thickness of the nanometer microporous heat insulation plate 3 is 0.5mm~5mm.
[0025] The adhesive tape 6 can use PI adhesive tape, acetic acid cloth adhesive tape or PET adhesive tape.
[0026] The width of the adhesive tape 6 is greater than the thickness of the composite component, and the adhesive tape 6 encapsulates the edge of the composite component completely by using a tape sticking machine.
[0027] Structural principle: first, a nanometer microporous heat insulation plate 3 with a thickness of 1mm~10mm is used, first adhesive 2 and second adhesive 4 are coated on the upper and lower surfaces of the nanometer microporous heat insulation plate 3 respectively, then first mica sheet 1 and second mica sheet 5 with a thickness of 0.1mm~0.5mm are respectively adhered and fixed on the corresponding first adhesive 2 and second adhesive 4 to form a composite component, and finally the adhesive tape 6 is pasted on the edge of the formed composite component by using a tape sticking machine to encapsulate the edge of the composite component.
[0028] The utility model discloses in practical application, the staff is pasted double -sided adhesive tape back glue on one side of nanometer board mica composite heat insulating sheet, and according to the demand of compression performance, adds the foam on the other side, then installs nanometer board mica composite heat insulating sheet between two batteries, can effectively reduce the temperature of battery in the process of charge and discharge, prevents the overheating phenomenon, thereby prolongs the service life of battery and promotes its security. When the battery heat runaway occurs, nanometer board mica composite heat insulating sheet can prevent heat from spreading to the surrounding battery, slow down the propagation speed of heat runaway, compared with traditional single or multilayer composite mica sheet, has the advantages of high temperature resistance, low thermal conductivity, high insulation, easy processing.
[0029] The thermal conductivity coefficient of the conventional mica sheet at normal temperature is 0.35-0.4 W / (mK), and the thermal conductivity coefficient of the nanometer board mica composite heat insulating sheet of the application at normal temperature is 0.031 W / (mK), as shown in Table 1.
[0030] Table 1
[0031]
[0032] The thermal conductivity coefficient of the nanometer board mica composite heat insulating sheet of the application measured under high temperature condition of 400 DEG C is 0.04958 W / (mK), which shows that it still has good heat insulation performance under high temperature condition, as shown in Table 2.
[0033] Table 2
[0034]
[0035] The steps of testing the cold surface temperature of the nanometer mica composite board are as follows:
[0036] 1. Measure the initial thickness of the sample and record it, clean the heating table and thick aluminum plate surface, make it clean, arrange the heating table temperature measuring line, turn on the temperature recorder, heating table, press, heat the heating table to 600±15 DEG C, and the temperature acquisition rate of the temperature recorder is 15S / time;
[0037] 2. After the temperature of the heating table is balanced, quickly place the sample on the heating table, arrange the sample cold surface temperature measuring line, and press the sample with thick aluminum block at the same time, and the press continuously applies 0.7±0.04 MPa stress to the sample, and keeps for 25 min after reaching the stress;
[0038] 3. Turn off all instruments after 25 min, take down the sample, measure the thickness of the sample, and calculate the thickness retention rate.
[0039] Please refer to Figure 3 , the test results show that the cold surface temperature is only 147 DEG C after 25 min, and the cold and hot surface temperature difference reaches 453 DEG C, and the nanometer board mica composite heat insulating sheet of the application has very good heat insulation effect.
[0040] The embodiments of the present application have been described in detail with reference to the drawings. It should be noted that the implementation manners not shown or described in the drawings or the specification are known to those skilled in the art, and are not described in detail. In addition, the definition of each component described above is not limited to the specific structure, shape or manner mentioned in the embodiments, and those skilled in the art can make simple changes or replacements.
[0041] Those skilled in the art can understand that the features described in various embodiments and / or claims of the present application can be combined or / and combined, even if such combination or combination is not explicitly described in the present application. In particular, the features described in various embodiments and / or claims of the present application can be combined and / or combined without departing from the spirit and teachings of the present application. All these combinations and / or combinations fall within the scope of the present application.
[0042] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only for specific embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A nano-plate mica composite heat insulation sheet for preventing thermal runaway of a lithium battery, comprising a composite assembly, characterized in that: The composite assembly comprises a first mica sheet (1), one side of the first mica sheet (1) is coated with a first adhesive (2), the side of the first mica sheet (1) is fixedly connected with a nano-microporous heat insulation plate (3) through the first adhesive (2), the side of the nano-microporous heat insulation plate (3) away from the first adhesive (2) is coated with a second adhesive (4), the side of the nano-microporous heat insulation plate (3) away from the first adhesive (2) is fixedly connected with a second mica sheet (5) through the second adhesive (4), and the edge of the composite assembly is attached with adhesive tape (6).
2. The nano-plate mica composite heat insulation sheet for preventing thermal runaway of lithium batteries according to claim 1, characterized in that: The thickness of the first mica sheet (1) and the second mica sheet (5) is 0.1mm-0.5mm.
3. The nano-plate mica composite heat insulation sheet for preventing thermal runaway of lithium batteries according to claim 1, characterized in that: The first mica sheet (1) and the second mica sheet (5) are both gold mica sheets.
4. The nano-plate mica composite heat insulation sheet for preventing thermal runaway of lithium batteries according to claim 1, characterized in that: The adhesives of the first adhesive (2) and the second adhesive (4) can use heat-absorbing glue, fire-retardant glue or expandable glue above 200℃.
5. The nano-plate mica composite heat insulation sheet for preventing thermal runaway of lithium batteries according to claim 1, characterized in that: The thickness of the nano-microporous heat insulation plate (3) is 0.5mm-5mm.
6. The nano-plate mica composite heat insulation sheet for preventing thermal runaway of lithium batteries according to claim 1, characterized in that: The adhesive tape (6) can use PI adhesive tape, acetic acid cloth adhesive tape or PET adhesive tape.
7. The nano-plate mica composite insulation sheet for preventing thermal runaway of lithium batteries according to claim 6, characterized in that: The width of the adhesive tape (6) is greater than the thickness of the composite assembly, and the adhesive tape (6) encapsulates the edge of the composite assembly completely through a tape attaching machine.