Battery upper cover structure and battery pack

Abstract

The utility model provides a kind of battery upper cover structure and battery pack, the battery upper cover structure includes the fireproof heat insulation layer and support layer of laminated arrangement;The fireproof heat insulation layer includes first fireproof silicone rubber layer, first reinforcing fiber layer, heat insulation silicone rubber layer, second reinforcing fiber layer and second fireproof silicone rubber layer of sequentially laminated arrangement, and the second fireproof silicone rubber layer is close to the support layer setting.The utility model is specifically designed to the battery upper cover structure, so that it has excellent fireproof performance and heat insulation performance, while the overall quality is relatively small, conducive to the lightweight design of battery pack, improve electric vehicle range, also have excellent insulation performance and flame retardant performance, meet the design specification of existing battery pack.

Description

Technical Field

[0001] This utility model belongs to the field of battery cover technology, and relates to a battery cover structure and battery pack. Background Technology

[0002] With the global emphasis on sustainable energy and low-carbon travel, the electric vehicle industry has risen rapidly in the past few years and has become an important development direction in the future transportation sector. However, fires caused by battery pack thermal runaway have always been a major obstacle to the smooth development of electrification. To reduce the threat to the lives and property of occupants from electric vehicle fires, it is necessary to refer to the strictest new national standard for electric vehicle batteries, GB38031-2025 "Safety Requirements for Power Batteries for Electric Vehicles," which requires that after battery pack thermal runaway, "it should not catch fire, explode, or cause harm to occupants with smoke." This places higher demands on the performance of the battery pack cover.

[0003] Therefore, the performance requirements of the battery pack cover include protecting the internal structure of the battery, electrical insulation performance, high airtightness, strong impact resistance, and the ability to block flames and smoke. In addition, the material selection for the battery pack cover needs to meet the conditions of good formability of large parts, good dimensional stability, high strength and toughness, and good flame retardancy.

[0004] However, current battery pack covers can only withstand burn-through temperatures of approximately 550℃ to 750℃, with burn-through times ranging from 15 seconds to 60 seconds. This is insufficient to effectively prevent thermal runaway flame spillage, especially in the case of ternary lithium-ion (NCM) battery packs experiencing thermal runaway. In such cases, ordinary battery pack covers can be punctured by the high-temperature (800℃ to 1300℃) and high-pressure current collector in a very short time. Therefore, there is an urgent need to design a battery cover structure that overcomes the shortcomings of existing technologies to meet practical application requirements. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a battery cover structure and battery pack. In this utility model, through the specific design of the battery cover structure, it has excellent fire resistance and heat insulation performance, while the overall weight is relatively small, which is conducive to the lightweight design of the battery pack, improves the driving range of electric vehicles, and also has excellent insulation and flame retardant performance, which meets the design specifications of existing battery packs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a battery cover structure, which includes a fireproof and heat-insulating layer and a support layer stacked together;

[0008] The fireproof and heat-insulating layer includes a first fireproof silicone rubber layer, a first reinforcing fiber layer, a heat-insulating silicone rubber layer, a second reinforcing fiber layer, and a second fireproof silicone rubber layer stacked in sequence, with the second fireproof silicone rubber layer disposed close to the support layer.

[0009] In this utility model, through the specific design of the battery cover structure, it has excellent fire resistance and heat insulation performance, while the overall weight is relatively small, which is conducive to the lightweight design of the battery pack, improves the driving range of electric vehicles, and also has excellent insulation and flame retardant performance, which meets the design specifications of existing battery packs.

[0010] As a preferred technical solution of this utility model, the thickness of the fireproof and heat-insulating layer is 0.6mm to 4mm, for example, it can be 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0011] As a preferred technical solution of this utility model, the thickness of the first fireproof silicone rubber layer is 0.03mm to 0.2mm, for example, it can be 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0012] Furthermore, the thickness of the second fire-retardant silicone rubber layer is 0.03mm to 0.2mm, for example, it can be 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0013] As a preferred technical solution of this utility model, the thickness of the first reinforcing fiber layer is 0.1mm to 0.5mm, for example, it can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0014] Furthermore, the thickness of the second reinforcing fiber layer is 0.1mm to 0.5mm, for example, it can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0015] As a preferred technical solution of this utility model, the first reinforcing fiber layer is any one of glass fiber layer, carbon fiber layer and basalt fiber layer.

[0016] Furthermore, the second reinforcing fiber layer is any one of a glass fiber layer, a carbon fiber layer, and a basalt fiber layer.

[0017] As a preferred technical solution of this utility model, the thickness of the heat-insulating silicone rubber layer is 0.2mm to 3mm, for example, it can be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0018] As a preferred technical solution of this utility model, the support layer is a metal layer or a composite material layer.

[0019] As a preferred technical solution of this utility model, the thickness of the support layer is 0.5mm to 4mm, for example, it can be 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0020] As a preferred technical solution of this utility model, an adhesive layer is provided between the fireproof and heat-insulating layer and the supporting layer.

[0021] As a preferred technical solution of this utility model, the thickness of the adhesive layer is 0.03mm to 0.2mm, for example, it can be 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0022] Secondly, this utility model provides a battery pack, which includes the battery cover structure described in the first aspect.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] In this utility model, through the specific design of the battery cover structure, it has excellent fire resistance and heat insulation performance, while the overall weight is relatively small, which is conducive to the lightweight design of the battery pack, improves the driving range of electric vehicles, and also has excellent insulation and flame retardant performance, which meets the existing battery pack design specifications.

[0025] The battery cover structure in this utility model can withstand prolonged burning by flames above 1300°C. After thermal runaway of the NCM battery pack, it can resist the impact of high-pressure flames and molten metal particles, preventing high-pressure flames and ejected materials from penetrating the battery pack and entering the passenger compartment.

[0026] The battery cover structure in this utility model can establish a heat insulation barrier between the power battery pack and the passenger compartment, which can delay the spread of high temperature to the passenger compartment in the event of thermal runaway of the battery pack, thus ensuring escape time.

[0027] The fireproof and heat-insulating layer of the battery cover structure in this invention is composed of multiple layers of fabric and silicone rubber, and has excellent insulation properties. Attached Figure Description

[0028] Figure 1 A schematic diagram of a battery cover structure provided for a specific embodiment of the present utility model;

[0029] Figure 2 A schematic diagram of the fireproof and heat-insulating layer in a battery cover structure provided for a specific embodiment of this utility model;

[0030] Among them, 1-fireproof and heat-insulating layer; 2-adhesive layer; 3-supporting layer; 4-first fireproof silicone rubber layer; 5-first reinforcing fiber layer; 6-heat-insulating silicone rubber layer; 7-second reinforcing fiber layer; 8-second fireproof silicone rubber layer. Detailed Implementation

[0031] It should be understood that in the description of this utility model, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] In one specific embodiment, the present invention provides a battery cover structure, such as... Figure 1 As shown, the battery cover structure includes a fireproof and heat-insulating layer 1 and a supporting layer 3 stacked together; as Figure 2 As shown, the fireproof and heat-insulating layer 1 includes a first fireproof silicone rubber layer 4, a first reinforcing fiber layer 5, a heat-insulating silicone rubber layer 6, a second reinforcing fiber layer 7, and a second fireproof silicone rubber layer 8 stacked in sequence, with the second fireproof silicone rubber layer 8 disposed close to the support layer 3.

[0035] It should be noted that the battery cover structure in this utility model includes a fireproof and heat-insulating layer 1 and a supporting layer 3 stacked from bottom to top, as well as specific arrangements to cooperate with the fireproof and heat-insulating layer 1. All of these are indispensable, so that the specific design of the battery cover structure can give it excellent fireproof and heat-insulating performance while keeping the overall weight relatively small. This is conducive to the lightweight design of the battery pack, improves the driving range of electric vehicles, and also has excellent insulation and flame-retardant performance, which meets the design specifications of existing battery packs.

[0036] In one embodiment, the thickness of the fireproof and heat-insulating layer 1 is 0.6mm to 4mm, for example, it can be 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0037] In this invention, the thickness of the fireproof and heat-insulating layer 1 is designed to be 0.6mm to 4mm. This is because within this range, the thickness can be adjusted to ensure that the top cover is not burned through after thermal runaway of different batteries. If it is below this range, the top cover of the battery may be burned through. If it is above this range, the weight of the battery pack will increase.

[0038] In one embodiment, the thickness of the first fire-retardant silicone rubber layer 4 is 0.03mm to 0.2mm, for example, it can be 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0039] In one embodiment, the thickness of the second fire-retardant silicone rubber layer 8 is 0.03mm to 0.2mm, for example, it can be 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0040] In this invention, the thickness of the first fireproof silicone rubber layer 4 is 0.03mm to 0.2mm and the thickness of the second fireproof silicone rubber layer 8 are 0.03mm to 0.2mm. This is because within this range, the fireproof and heat-insulating layer can be guaranteed to have good fireproof performance. If the thickness is lower than this range, the fireproof performance of the fireproof and heat-insulating layer will decrease. If the thickness is higher than this range, it will increase the overall thickness and weight of the battery cover.

[0041] It should be noted that the first fire-retardant silicone rubber layer 4 and the second fire-retardant silicone rubber layer 8 in this utility model can be made of the same material, or they can have slight differences in additives. The material and thickness of the two can be selected independently, and those skilled in the art can make adaptive adjustments according to the actual situation. The raw materials of the fire-retardant silicone rubber layer include silicone oil, methyl vinyl silicone rubber, silica, aluminum hydroxide, ceramic fillers, etc.

[0042] In one embodiment, the thickness of the first reinforcing fiber layer 5 is 0.1 mm to 0.5 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0043] In one embodiment, the thickness of the second reinforcing fiber layer 7 is 0.1 mm to 0.5 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0044] In this invention, the thickness of the first reinforcing fiber layer 5 is 0.1mm to 0.5mm and the thickness of the second reinforcing fiber layer 7 is 0.1mm to 0.5mm. This is because within this range, the fireproof and heat-insulating layer can still have high strength when the battery pack experiences thermal runaway. If it is below this range, the fireproof and heat-insulating layer may crack when the battery pack experiences thermal runaway. If it is above this range, it will increase the overall thickness and weight of the battery cover.

[0045] It should be noted that the materials of the first reinforcing fiber layer 5 and the second reinforcing fiber layer 7 in this utility model can be exactly the same or different. The materials and thickness values ​​of the two can be selected independently, and those skilled in the art can make adaptive adjustments according to the actual situation.

[0046] In one embodiment, the first reinforcing fiber layer 5 is any one of a glass fiber layer, a carbon fiber layer, and a basalt fiber layer.

[0047] It should be noted that the first reinforcing fiber layer 5 in this utility model can be a glass fiber layer, a carbon fiber layer, a basalt fiber layer, or a glass fiber layer plus a carbon fiber layer. Glass fiber layer can be preferred because it has a high cost-performance ratio. For very demanding working conditions, carbon fiber layer can be selected, and for less demanding working conditions, basalt fiber layer can be selected.

[0048] In one embodiment, the second reinforcing fiber layer 7 is any one of a glass fiber layer, a carbon fiber layer, and a basalt fiber layer.

[0049] It should be noted that the first reinforcing fiber layer 5 in this utility model can be a glass fiber layer, a carbon fiber layer, a basalt fiber layer, a glass fiber layer plus a carbon fiber layer, or a glass fiber layer plus a basalt fiber layer. Glass fiber layer can be preferred because it has a high cost-performance ratio. For very demanding working conditions, carbon fiber layer can be selected, and for less demanding working conditions, basalt fiber layer can be selected.

[0050] In one embodiment, the thickness of the heat-insulating silicone rubber layer 6 is 0.2mm to 3mm, for example, it can be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0051] The thickness of the heat-insulating silicone rubber layer 6 in this invention is 0.2mm to 3mm. This is because within this range, the fireproof and heat-insulating layer has excellent heat insulation performance when the battery pack experiences thermal runaway, ensuring that the support layer 3 is not melted or burned through. If the thickness is below this range, the support layer 3 may be melted or burned through. If the thickness is above this range, the overall thickness and weight of the battery cover will increase, as will the cost.

[0052] In one embodiment, the support layer 3 is a metal layer or a composite material layer.

[0053] It should be noted that the metal layer in this invention can be composed of steel, aluminum alloy, etc., and the composite material layer can be composed of SMC composite material (a type of fiberglass), PCM composite material (paraffin wax, fatty acids, water and salt, metal alloy components, graphite and expanded perlite, etc.), RTM-derived composite material (glass fiber, carbon fiber, aramid fiber, epoxy resin, unsaturated polyester resin and vinyl ester, etc.), nylon (PA), glass fiber (GF), polypropylene (PP), etc. Those skilled in the art can make appropriate selections according to the actual situation.

[0054] In one embodiment, the thickness of the support layer 3 is 0.5mm to 4mm, for example, it can be 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0055] In this invention, the thickness of the support layer 3 is 0.5mm to 4mm. This is because within this range, the battery cover can be guaranteed to have good strength to protect the battery pack. If it is less than this range, the battery cover may deform or break under special circumstances such as impact. If it is more than this range, it will increase the overall thickness and weight of the battery pack, which is not conducive to lightweighting and will also increase the cost.

[0056] In one embodiment, an adhesive layer 2 is provided between the fireproof and heat-insulating layer 1 and the support layer 3.

[0057] It should be noted that the adhesive layer 2 in this utility model can be formed by double-sided tape or adhesive, and the adhesive can be acrylic adhesive, silicone adhesive, etc.

[0058] In one embodiment, the thickness of the adhesive layer 2 is 0.03 mm to 0.2 mm, for example, it can be 0.03 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0059] The thickness of the adhesive layer 2 in this invention is 0.03mm to 0.2mm. This is because within this range, the fireproof and heat-insulating layer and the supporting layer 3 can be guaranteed not to fall off. If it is less than this range, the fireproof and heat-insulating layer and the supporting layer 3 may delaminate. If it is more than this range, it will increase the thickness of the battery pack cover and increase the cost.

[0060] In another specific embodiment, the present invention provides a battery pack, the battery pack including the battery cover structure described above.

[0061] It should be noted that the battery pack in this utility model may include battery cells, modules, housing, top cover, thermal management system, electrical components, and sealing materials. The battery cells consist of a positive electrode, a negative electrode, and a separator. The positive electrode material can be ternary lithium battery or lithium iron phosphate battery, and the negative electrode material can be graphite or silicon carbide. The module material can be a metal frame (aluminum alloy) and an insulating film (polycarbonate / polypropylene). The housing and top cover are fitted together, and the housing material can be metal. The thermal management system is mainly used for heat dissipation or heating of the battery pack and can adopt liquid cooling or air cooling modes. The material can be a liquid cooling plate or thermally conductive adhesive. The electrical components can be made of copper busbars or insulating plastic (polyurethane + glass fiber / polybutylene terephthalate + glass fiber). The sealing material can be fire-retardant silicone rubber or epoxy resin.

[0062] Example 1

[0063] This embodiment provides a battery top cover structure, wherein:

[0064] The battery cover structure includes a fireproof and heat-insulating layer 1 and a support layer 3 stacked together; the fireproof and heat-insulating layer 1 includes a first fireproof silicone rubber layer 4, a first reinforcing fiber layer 5, a heat-insulating silicone rubber layer 6, a second reinforcing fiber layer 7 and a second fireproof silicone rubber layer 8 stacked together in sequence, with the second fireproof silicone rubber layer 8 disposed close to the support layer 3.

[0065] The thickness of the fireproof and heat-insulating layer 1 is 1mm, the thickness of the first fireproof silicone rubber layer 4 is 0.1mm, and the thickness of the second fireproof silicone rubber layer 8 is 0.1mm.

[0066] The thickness of the first reinforcing fiber layer 5 is 0.2 mm, and the thickness of the second reinforcing fiber layer 7 is 0.2 mm; the first reinforcing fiber layer 5 is a glass fiber layer, and the second reinforcing fiber layer 7 is a glass fiber layer.

[0067] The thickness of the heat-insulating silicone rubber layer 6 is 0.8 mm, and the support layer 3 is a metal layer with a thickness of 1 mm.

[0068] An adhesive layer 2 is provided between the fireproof and heat-insulating layer 1 and the supporting layer 3, and the thickness of the adhesive layer 2 is 0.05mm.

[0069] Example 2

[0070] This embodiment provides a battery top cover structure, wherein:

[0071] The battery cover structure includes a fireproof and heat-insulating layer 1 and a support layer 3 stacked together; the fireproof and heat-insulating layer 1 includes a first fireproof silicone rubber layer 4, a first reinforcing fiber layer 5, a heat-insulating silicone rubber layer 6, a second reinforcing fiber layer 7 and a second fireproof silicone rubber layer 8 stacked together in sequence, with the second fireproof silicone rubber layer 8 disposed close to the support layer 3.

[0072] The thickness of the fireproof and heat-insulating layer 1 is 2mm, the thickness of the first fireproof silicone rubber layer 4 is 0.1mm, and the thickness of the second fireproof silicone rubber layer 8 is 0.1mm.

[0073] The thickness of the first reinforcing fiber layer 5 is 0.3 mm, and the thickness of the second reinforcing fiber layer 7 is 0.3 mm; the first reinforcing fiber layer 5 is a carbon fiber layer, and the second reinforcing fiber layer 7 is a carbon fiber layer.

[0074] The thickness of the heat-insulating silicone rubber layer 6 is 1.5mm, and the support layer 3 is a metal layer with a thickness of 2.5mm.

[0075] An adhesive layer 2 is provided between the fireproof and heat-insulating layer 1 and the supporting layer 3. The thickness of the adhesive layer 2 is 0.1mm.

[0076] Example 3

[0077] This embodiment provides a battery top cover structure, wherein:

[0078] The battery cover structure includes a fireproof and heat-insulating layer 1 and a support layer 3 stacked together; the fireproof and heat-insulating layer 1 includes a first fireproof silicone rubber layer 4, a first reinforcing fiber layer 5, a heat-insulating silicone rubber layer 6, a second reinforcing fiber layer 7 and a second fireproof silicone rubber layer 8 stacked together in sequence, with the second fireproof silicone rubber layer 8 disposed close to the support layer 3.

[0079] The thickness of the fireproof and heat-insulating layer 1 is 4mm, the thickness of the first fireproof silicone rubber layer 4 is 0.2mm, and the thickness of the second fireproof silicone rubber layer 8 is 0.2mm.

[0080] The thickness of the first reinforcing fiber layer 5 is 0.5 mm, and the thickness of the second reinforcing fiber layer 7 is 0.5 mm; the first reinforcing fiber layer 5 is a basalt fiber layer, and the second reinforcing fiber layer 7 is a basalt fiber layer.

[0081] The thickness of the heat-insulating silicone rubber layer 6 is 3mm, and the support layer 3 is a composite material layer with a thickness of 4mm.

[0082] An adhesive layer 2 with a thickness of 0.2 mm is provided between the fireproof and heat-insulating layer 1 and the supporting layer 3.

[0083] The battery cover structure in the above embodiments was subjected to fire resistance and heat insulation tests. The test methods included laboratory simulation tests and real battery pack thermal runaway tests.

[0084] The test results show that the battery cover structure in Examples 1-3 provides a significant improvement in the protection against thermal runaway of the battery pack. This is because the present invention combines the fireproof and heat-insulating layer 1 and the supporting layer 3. The excellent fireproof and heat-insulating properties of the fireproof and heat-insulating layer 1 effectively protect the supporting layer 3, so that when the battery pack experiences thermal runaway, the battery cover as a whole still has excellent strength to block the spread of flames and temperature, thus achieving excellent technical results.

[0085] In summary, this utility model, through the specific design of the battery cover structure, enables it to possess excellent fire resistance and heat insulation performance while maintaining a relatively small overall weight. This facilitates lightweight battery pack design, improves the driving range of electric vehicles, and also provides excellent insulation and flame retardant performance, complying with existing battery pack design specifications.

[0086] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A battery cover structure, characterized in that, The battery cover structure includes a fireproof and heat-insulating layer and a supporting layer stacked together; The fireproof and heat-insulating layer includes a first fireproof silicone rubber layer, a first reinforcing fiber layer, a heat-insulating silicone rubber layer, a second reinforcing fiber layer, and a second fireproof silicone rubber layer stacked in sequence, with the second fireproof silicone rubber layer disposed close to the support layer.

2. The battery cover structure according to claim 1, characterized in that, The thickness of the fireproof and heat-insulating layer is 0.6mm to 4mm.

3. The battery cover structure according to claim 1, characterized in that, The thickness of the first fire-retardant silicone rubber layer is 0.03mm to 0.2mm; The thickness of the second fire-retardant silicone rubber layer is 0.03mm to 0.2mm.

4. The battery cover structure according to claim 1, characterized in that, The thickness of the first reinforcing fiber layer is 0.1 mm to 0.5 mm; The thickness of the second reinforcing fiber layer is 0.1 mm to 0.5 mm.

5. The battery cover structure according to claim 1, characterized in that, The first reinforcing fiber layer is any one of glass fiber layer, carbon fiber layer and basalt fiber layer; The second reinforcing fiber layer is any one of glass fiber layer, carbon fiber layer and basalt fiber layer.

6. The battery cover structure according to claim 1, characterized in that, The thickness of the heat-insulating silicone rubber layer is 0.2mm to 3mm.

7. The battery cover structure according to claim 1, characterized in that, The support layer is a metal layer or a composite material layer.

8. The battery cover structure according to claim 1, characterized in that, The thickness of the support layer is 0.5mm to 4mm.

9. The battery cover structure according to claim 1, characterized in that, An adhesive layer is provided between the fireproof and heat-insulating layer and the supporting layer, and the thickness of the adhesive layer is 0.03mm to 0.2mm.

10. A battery pack, characterized in that, The battery pack includes the battery cover structure as described in any one of claims 1-9.

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