CN219523264U

CN219523264U - Heat-insulating fireproof composite board for lithium battery

Info

Publication number: CN219523264U
Application number: CN202320332911.9U
Authority: CN
Inventors: 潘渡江; 卢智虎; 吴学领; 李俊
Original assignee: Hubei Ping'an Electric Technology Co ltd
Current assignee: Hubei Ping'an Electric Technology Co ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-08-15
Anticipated expiration: 2033-02-28

Abstract

The utility model relates to the technical field of new energy electric automobile parts and provides a lithium battery heat-insulating fireproof composite board, which comprises a mica layer, an aerogel layer and a sealing bag, wherein the aerogel layer is filled in the sealing bag, and the sealing bag is used for isolating the aerogel layer from the outside; the number of the mica layers is two, and the mica layers are oppositely arranged outside the sealing bag. This thermal-insulated fire prevention composite sheet of lithium cell has better thermal-insulated performance for using individual layer mica board to reduce whole board weight, make the mechanical properties of whole board better, fill up aerogel layer in the envelope simultaneously, make aerogel layer keep apart with the external world, thereby avoid the aerogel layer to pollute the production line when compounding, influence combined machining, can reduce the cost of labor, set up the envelope into PET film bag or PI film bag, can stabilize the cladding in the outside of aerogel layer, and prevent that the powder from falling on the aerogel layer in the course of the processing, but the insulating thermal-insulated performance and the mechanical properties of improvement whole board of a small margin simultaneously.

Description

Heat-insulating fireproof composite board for lithium battery

Technical Field

The utility model relates to the technical field of new energy electric automobile parts, in particular to a heat-insulating fireproof composite board for a lithium battery.

Background

The core component of the new energy electric automobile in development in the market at present is a lithium battery pack, a great amount of heat can be emitted by the lithium battery in the working process, and high temperature can be generated under extreme conditions, so that potential safety hazards are caused to vehicles and human bodies, and a mica plate using mica as a material is often assembled on the surface of the lithium battery. The mica plate has the main characteristics of super high temperature resistance and excellent insulating property. The electric automobile can generate high temperature when in abnormal operation, and the high temperature resistance of the mica plate can effectively prevent the high temperature from directly acting on a vehicle cab and a rear seat, so that the escape time of personnel in the automobile is enough.

The mica plate has better high temperature resistance, but has poor heat insulation performance, in order to ensure the heat insulation effect in the prior art, aerogel is often adopted to replace the mica plate, for example, a square cell power battery pack with a publication number of CN111224034A (see paragraphs 0032-0045) discloses that a heat protection plate is arranged between the cells, and the heat protection plate is an aerogel plate so as to improve the heat insulation effect between the cells.

Although the aerogel plate is better and less in density than mica plate heat insulation effect, but the high temperature resistance of aerogel plate is relatively poor, only can insulate against heat, can not prevent fires, and the aerogel plate falls powder easily, and if dust is too much in the battery package in the in-process of equipment, then can lead to the cleanliness not up to standard in the battery package.

Disclosure of Invention

In view of the above, the utility model provides a heat-insulating fireproof composite board for a lithium battery, which is characterized in that an envelope is arranged outside an aerogel layer to prevent dust falling off from the aerogel layer into a production line and a battery pack, and a mica layer is arranged outside the envelope, so that the fire resistance of the whole board is improved.

The technical scheme of the utility model is realized as follows: the utility model provides a heat-insulating fireproof composite board of a lithium battery, which comprises a mica layer, an aerogel layer and a sealing bag, wherein,

the aerogel layer is filled in the envelope, and the envelope is used for isolating the aerogel layer from the outside;

the number of the mica layers is two, and the mica layers are oppositely arranged outside the sealing bag.

On the basis of the technical scheme, the adhesive layer is preferably arranged between the mica layer and the sealing bag and used for bonding the mica layer and the sealing bag.

On the basis of the technical scheme, preferably, the aerogel layer is one of an inorganic aerogel plate, an organic aerogel plate, a mixed aerogel plate and a composite aerogel plate.

Further preferably, the adhesive layer is glue or double-sided adhesive.

Further preferably, the thickness of the adhesive layer is 0.03-1mm.

On the basis of the technical scheme, preferably, the sealing bag is a PET film bag or a PI film bag.

On the basis of the technical scheme, the single-layer thickness of the sealing bag is preferably 0.01-0.05mm.

On the basis of the technical scheme, the thickness of the aerogel layer is preferably 0.5-2.5mm.

On the basis of the technical scheme, the thickness of the mica layer is preferably 0.2-2mm.

Compared with the prior art, the lithium battery heat-insulating fireproof composite board has the following beneficial effects:

(1) Through setting up the aerogel layer to set up the envelope outside the aerogel layer, for using the better thermal-insulated performance of individual layer mica board, and reduce whole board weight, make the mechanical properties of whole board better, fill the aerogel layer in the envelope simultaneously, make the aerogel layer keep apart with the external world, thereby avoid the aerogel layer pollution production line when compounding, influence compound processing, can reduce the cost of labor;

(2) The sealing bag is arranged to be a PET film bag or a PI film bag, so that the sealing bag can be stably coated outside the aerogel layer, the aerogel layer is prevented from powder falling in the processing process, and meanwhile, the insulation and heat insulation performance and mechanical performance of the whole plate can be improved by a small margin.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a lithium battery heat-insulating fire-proof composite board of the present utility model;

fig. 2 is a schematic layer structure of the heat-insulating fire-proof composite board for lithium battery of the utility model.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1-2, the lithium battery heat-insulating fireproof composite board is arranged on the surface of battery pack cells, can be particularly arranged among the battery pack cells, has the thickness of 1-5mm in consideration of the overall energy density and space of the battery pack, and is capable of avoiding poor heat-insulating performance caused by over-thinness or larger occupied space of the battery pack caused by over-thickness and influencing the energy density of the battery pack, and is particularly composed of a mica layer 1, an aerogel layer 2 and a sealing bag 3.

The mica layer 1 is made of mica materials, is a high-temperature resistant and insulating material with excellent performance, is formed by stacking a piece of thin mica paper together and pressing the mica paper at high temperature and high pressure for a period of time, and can be a mica plate or a mica tape, and if the mica plate is a mica plate, the mica plate is formed by laminating mica paper and organic silica gel, and is a hard material; if the mica tape is formed by laminating mica paper, glass fiber cloth and glue, the mica tape is a flexible material.

The aerogel layer 2 is selected as an aerogel plate, is in a solid substance form, has ultralow density of about 3 kilograms per cubic meter, and has small scattering of visible light when passing through the aerogel plate because of the very small nanometer level of particles in the aerogel layer, and is just like sunlight passes through air. Because the aerogel is more than 80% of air generally, the aerogel has a very good heat insulation effect, the thick aerogel of an inch is equivalent to the heat insulation function of 20 to 30 pieces of common glass, the aerogel has certain elasticity, can improve the vibration resistance of a battery pack, has the advantage of good heat insulation performance, avoids the mutual influence after the electric core works and heats, improves the working safety and stability of the electric core, and simultaneously adopts the aerogel to insulate heat, so that the whole weight of the battery pack can be reduced, but in the forming process of the composite board, the aerogel layer 2 can generate powder falling, pollute a production line, cause certain trouble to the cleaning of the production line and the compounding process, and simultaneously consume manpower.

The aerogel layer 2 is used as the main heat insulation material of the whole board, and the thickness of the aerogel layer 2 is about one half of that of the whole board, namely, the thickness of the aerogel layer 2 is in the range of 0.5-2.5mm.

The envelope 3 is whole to be the pocket form setting, inside cavity can pack aerogel layer 2 in envelope 3 for aerogel layer 2 keeps apart with the external world, thereby avoid aerogel layer 2 to pollute the production line when compounding, influence compound processing, can reduce the cost of labor, in specific production process, aerogel layer 2 is at first sealed in envelope 3, and empty the air in the envelope 3, carry out the banding, make the unable loss of powder on the aerogel layer 2, send into compound production line by the aerogel layer 2 of envelope 3 parcel again, can solve the problem that aerogel layer 2 falls the powder on the compound line.

The number of the mica layers 1 is two, after the air gel layer 2 is coated by the sealing bag 3, the two mica layers 1 are compounded on two sides in the thickness direction of the sealing bag 3, namely, the two sides are fixed with the sealing bag 3, so that an integral composite board is formed, and in actual production, the thickness of the mica layers 1 is controlled to be 0.2-2mm.

It should be noted that, when the whole plate is formed, the dimension thereof should be manufactured according to actual needs so as to avoid the subsequent processing operations such as cutting, etc., the whole length dimension thereof is in the range of 0 to 2500mm, the width is in the range of 0 to 1500mm, the thickness is in the range of 1-5mm, the external structure thereof can be in a flat plate shape, and 3D characteristics with various shapes can also be pressed by a die so as to adapt to the space in the battery pack and fully fit the outside of each battery cell.

In the above embodiment, the adhesive layer 4 is further included, the adhesive layer 4 is disposed between the mica layer 1 and the sealing bag 3, and is used for bonding the mica layer 1 and the sealing bag 3, specifically, when the sealing bag 3 and the mica layer 1 are composited, the adhesive layer 4 is disposed on two sides of the sealing bag 3, the two mica layers 1 are composited on the sealing bag 3 in a pressing manner, and after bonding and compositing, the whole board can be drilled, molded and the like.

It should be noted that, the adhesive layer 4 may be glue or double sided adhesive, and double sided adhesive is preferably selected for composite processing, in the actual process, the adhesive layer 4 is required to have better viscosity, the peeling force with the mica layer 1 is more than or equal to 3N/25mm, so as to ensure the stability of the composite board, meanwhile, the thickness of the adhesive layer 4 should be in the range of 0.03-1mm considering that the thickness of the whole board is not too large, when the thickness requirement of the whole board is smaller, the thickness adaptability of the adhesive layer 4 is reduced, otherwise, when the thickness of the whole board is larger, the thickness adaptability of the adhesive layer 4 is increased.

In this embodiment, the aerogel layer 2 is one of an inorganic aerogel plate, an organic aerogel plate, a mixed aerogel plate and a composite aerogel plate, and although the aerogel layer 2 has a large number of optional materials, the manufacturing process is small, and the aerogel layer is made into sponge square plates, so that the powder falling problem is difficult to avoid, and the sealing bag 3 provided in the scheme can effectively avoid the problem.

As a preferred embodiment, the sealing bag 3 is a PET film bag or a PI film bag, the PET film is a packaging film with relatively comprehensive performance, the mechanical performance is excellent, the toughness is the best of all thermoplastic plastics, the tensile strength and the impact strength are much higher than those of the common film, the stiffness is good, the size is stable, and meanwhile, the sealing bag has certain heat insulation performance, so that the heat insulation effect and the mechanical performance of the whole plate can be improved to a small extent; PI film, namely polyimide film, is the best film type insulating material in the world, by pyromellitic dianhydride (PMDA) and diamine group diphenyl ether (ODA) in the strong polar solvent through condensation polymerization and tape casting and film forming and imidization, it has excellent high and low temperature resistance, electrical insulation, cohesiveness, radiation resistance, dielectric resistance, can be used for a long time in the temperature range of-269-280 ℃, can reach 400 ℃ in short time, can improve the insulation and heat insulation performance of the whole board by a small margin by using PI film bag.

Considering the cost of the whole plate and the thickness of the whole plate, the single-layer thickness of the envelope 3 should be set within 0.01-0.05mm, and the thickness is specifically selected according to practical situations.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The utility model provides a lithium cell thermal-insulated fire prevention composite sheet, its characterized in that includes mica layer (1): also comprises an aerogel layer (2) and a sealing bag (3), wherein,

the aerogel layer (2) is filled in the sealing bag (3), and the sealing bag (3) is used for isolating the aerogel layer (2) from the outside;

the number of the mica layers (1) is two, and the mica layers are oppositely arranged outside the sealing bag (3).

2. The lithium battery heat-insulating fire-preventing composite board according to claim 1, wherein: still include glue film (4), glue film (4) set up between mica layer (1) and envelope (3) for bond mica layer (1) and envelope (3).

3. The lithium battery heat-insulating fire-preventing composite board according to claim 1, wherein: the aerogel layer (2) is one of an inorganic aerogel plate, an organic aerogel plate, a mixed aerogel plate and a composite aerogel plate.

4. The lithium battery heat-insulating fire-preventing composite board according to claim 2, wherein: the adhesive layer (4) is glue or double-sided adhesive.

5. The lithium battery heat-insulating fire-preventing composite board according to claim 2, wherein: the thickness of the adhesive layer (4) is 0.03-1mm.

6. The lithium battery heat-insulating fire-preventing composite board according to claim 1, wherein: the sealing bag (3) is a PET film bag or a PI film bag.

7. The lithium battery heat-insulating fire-preventing composite board according to claim 1, wherein: the single-layer thickness of the envelope (3) is 0.01-0.05mm.

8. The lithium battery heat-insulating fire-preventing composite board according to claim 1, wherein: the thickness of the aerogel layer (2) is 0.5-2.5mm.

9. The lithium battery heat-insulating fire-preventing composite board according to claim 1, wherein: the thickness of the mica layer (1) is 0.2-2mm.