Battery upper cover, battery pack and vehicle

Abstract

The utility model relates to the technical field of power batteries, and provides a battery upper cover, a battery pack and a vehicle. The battery upper cover comprises an upper cover body, the upper cover body is integrally formed by molding a plurality of laminated prepreg layers, the upper cover body comprises a fireproof area and a non-fireproof area surrounding the peripheral edge of the fireproof area, and at least one of the plurality of prepreg layers of the fireproof area is a fireproof prepreg layer. According to the battery upper cover provided by the invention, the non-fireproof area and the fireproof area with a fireproof function can be directly formed during mold pressing integral forming, thermal runaway protection can be carried out on a part of areas, and the forming cost of the battery upper cover is reduced while the fireproof function is ensured; and the safety of the battery pack and the vehicle is improved while the battery pack has good flame burning resistance and structural maintenance performance under a burning condition.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and particularly to a battery upper cover, a battery pack, and a vehicle. Background Art

[0002] New energy vehicles have achieved rapid development in recent years due to their low energy consumption, excellent driving performance, environmental friendliness, high-tech addition, and other advantages. New energy power batteries usually use lithium-ion batteries, and lithium-ion batteries have a risk of thermal runaway under conditions such as overcharging, overheating, and overextrusion. The battery pack will pose a fire hazard, so various aspects of protection for the power battery pack are required.

[0003] In the existing battery pack upper cover, a mica plate is usually adhered to the bottom surface of the upper cover or above the module using double-sided tape. When thermal runaway occurs, the mica plate can play a role in blocking the flame from burning the upper cover and preventing the flame from burning through the upper cover. However, due to the relatively large weight of the mica plate, there is a risk of the double-sided tape failing when burned by the flame, resulting in the mica plate detaching from the battery pack upper cover and affecting the fire protection effect of the upper cover; the mica plate vertically arranged on the upper cover will occupy more internal space of the battery pack, affecting the battery capacity. At the same time, the assembly process of the mica plate is relatively complex, affecting the installation efficiency of the upper cover. Summary of the Utility Model

[0004] To solve the above technical problems, the present disclosure provides a battery upper cover, a battery pack, and a vehicle.

[0005] In a first aspect of the present disclosure, there is provided a battery upper cover, including an upper cover body, the upper cover body is integrally formed by molding multiple prepreg layers stacked on top of each other, and the upper cover body includes a fire protection area and a non-fire protection area surrounding the four peripheral edges of the fire protection area;

[0006] Wherein, at least one layer of the multiple prepreg layers in the fire protection area is a fire protection prepreg layer.

[0007] Optionally, the multiple prepreg layers in the fire protection area include at least one non-fire protection prepreg layer and at least one fire protection prepreg layer, and the non-fire protection prepreg layer and the fire protection prepreg layer are stacked;

[0008] The multiple prepreg layers in the non-fire protection area include at least one non-fire protection prepreg layer.

[0009] Optionally, the thickness of the non-fire protection prepreg layer is greater than or equal to 0.2 mm and less than or equal to 1 mm, and the thickness of the fire protection prepreg layer is greater than or equal to 0.2 mm and less than or equal to 1.5 mm;

[0010] The ratio of the thickness of the fire protection prepreg layer to the thickness of the non-fire protection prepreg layer is greater than or equal to 1.0 and less than or equal to 3;

[0011] The ratio of the thickness of the upper cover body corresponding to the fire prevention area to the thickness of the non-fire prevention prepreg layer is greater than or equal to 2.0 and less than or equal to 30.

[0012] Optionally, the non-fire prevention prepreg layer includes a resin matrix and a glass fiber layer impregnated in the resin matrix;

[0013] The fire prevention prepreg layer includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer impregnated in the resin matrix.

[0014] Optionally, the thickness of the fire prevention prepreg layer is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, and the thickness of the upper cover body corresponding to the fire prevention area is greater than or equal to 0.4 mm and less than or equal to 6 mm.

[0015] Optionally, the upper cover body includes a top plate portion and a side plate portion connected to the edge of the top plate portion. At least a part of the area of the top plate portion forms the fire prevention area, and the area of the top plate portion outside the fire prevention area and the side plate portion form the non-fire prevention area.

[0016] Optionally, the thickness of the upper cover body corresponding to the fire prevention area is equal to the thickness of the upper cover body corresponding to the non-fire prevention area.

[0017] Optionally, the thickness of the upper cover body corresponding to the fire prevention area is not equal to the thickness of the upper cover body corresponding to the non-fire prevention area, and the connection between the fire prevention area and the non-fire prevention area is smoothly connected with a rounded corner.

[0018] The second aspect of the present disclosure provides a battery pack, including a box body, a battery module, and the battery upper cover as described in any one of the above. The battery upper cover covers the box body, and a receiving space is formed between the battery upper cover and the box body, and the battery module is disposed in the receiving space.

[0019] The third aspect of the present disclosure provides a vehicle, including the battery pack as described above.

[0020] The technical solution provided by the present disclosure has the following advantages compared with the prior art:

[0021] The battery upper cover, battery pack, and vehicle provided by the present disclosure include an upper cover body. The upper cover body is integrally formed by molding multiple prepreg layers stacked on top of each other. After molding, the upper cover body includes a fireproof area and a non-fireproof area surrounding the four peripheral edges of the fireproof area. The fireproof area corresponds to the battery module to provide thermal runaway protection when the battery module experiences thermal runaway. Among them, at least one of the multiple prepreg layers in the fireproof area is a fireproof prepreg layer. That is to say, the fireproof prepreg layer has a fireproof function, so that the fireproof area molded from the fireproof prepreg layer has a fireproof function. With such a setting, when the battery upper cover is integrally formed by molding, a fireproof area with a fireproof function can be directly formed, and a non-fireproof area is formed at the four peripheral edge positions of the fireproof area. At the same time, by setting multiple prepreg layers, the battery upper cover can have a certain structural strength. In specific implementation, at least part of the area is formed into a fireproof area, and thermal runaway protection can be carried out for some areas, reducing the molding cost of the battery upper cover while ensuring the fireproof function. Compared with the protection methods using mica plates or other separate fireproof materials, the number of components can be simplified, the original assembly process can be eliminated, while having good flame burning resistance and structural retention performance under fire, the risk of mica plate detachment is avoided, the safety of the battery pack and the vehicle is improved, and space can be saved to increase the battery power, thereby improving the overall vehicle cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic structural diagram of the battery upper cover according to an embodiment of the present utility model;

[0025] Figure 2 Schematic diagram showing the connection between the fireproof area and the non-fireproof area according to an embodiment of the present utility model;

[0026] Figure 3 Schematic structural diagram of the fireproof prepreg layer according to an embodiment of the present utility model;

[0027] Figure 4 Schematic structural diagram of the fireproof prepreg layer according to another embodiment of the present utility model;

[0028] Figure 5 Schematic structural diagram of the fireproof prepreg layer according to still another embodiment of the present utility model.

[0029] Reference Numerals:

[0030] 1. Upper cover body; 11. Top plate portion; 12. Side plate portion; 13. Fire prevention area; 14. Non-fire prevention area;

[0031] 2. Prepreg layer; 21. Non-fire prevention prepreg layer; 22. Fire prevention prepreg layer; 23. Glass fiber layer. Detailed Embodiment

[0032] In order to more clearly understand the above-mentioned objects, features, and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0033] In the following description, many specific details are set forth to facilitate a thorough understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0034] The battery upper cover, battery pack, and vehicle of the present disclosure will be described in detail below through specific embodiments:

[0035] Referring to Figures 1 to 5 As shown, a battery upper cover provided by an embodiment of the present utility model includes an upper cover body 1. The upper cover body 1 is integrally formed by compression molding of multiple prepreg layers 2 stacked on top of each other. The formed upper cover body 1 includes a fire prevention area 13 and a non-fire prevention area 14 surrounding the four peripheral edges of the fire prevention area 13. The fire prevention area 13 corresponds to the battery module to provide thermal runaway protection when the battery module experiences thermal runaway through the fire prevention area 13.

[0036] Specifically, the upper cover body 1 is compression molded using thermosetting prepreg (Propreg Compression Molding, abbreviated as PCM), which is convenient for processing.

[0037] Among them, at least one layer of the multiple prepreg layers 2 in the fire prevention area 13 is a fire prevention prepreg layer 22. That is to say, the fire prevention prepreg layer 22 has a fire prevention function, so that the fire prevention area 13 formed by compression molding of the fire prevention prepreg layer 22 has a fire prevention function.

[0038] With such a setting, when the battery upper cover is integrally molded by compression molding, a fireproof area 13 with a fireproof function can be directly formed, and a non-fireproof area 14 is formed at the four peripheral edge positions of the fireproof area 13. At the same time, by arranging multiple prepreg layers 2, the battery upper cover can have a certain structural strength. Specifically, at least part of the area of the upper cover body 1 is formed into a fireproof area 13, which can provide thermal runaway protection for part of the area, reducing the molding cost of the battery upper cover while ensuring the fireproof function.

[0039] The battery upper cover provided by the embodiments of the present disclosure, compared with the protection methods using mica plates or other separate fireproof materials, can simplify the number of components, eliminate the original assembly process, have good flame burning resistance and structural retention performance under fire, avoid the risk of mica plate detachment, improve the safety of the battery pack and the vehicle, and can also save space to increase the battery power, thereby improving the overall vehicle cruising range.

[0040] It should be noted that the upper cover body 1 of the battery upper cover, that is, the main structure of the battery upper cover, can be additionally processed with structures such as screw holes for connecting with the box body of the battery pack.

[0041] In some embodiments, the multiple prepreg layers 2 of the fireproof area 13 include at least one non-fireproof prepreg layer 21 and at least one fireproof prepreg layer 22. That is to say, the non-fireproof prepreg layer 21 can be arranged in one or more layers, and the fireproof prepreg layer 22 can also be arranged in one or more layers. According to the requirements of the thickness and fireproof performance of different battery upper covers, one or more non-fireproof prepreg layers 21 and one or more fireproof prepreg layers 22 are combined in a set stacking order and finally integrally molded into the fireproof area 13 by compression molding.

[0042] The multiple prepreg layers 2 of the non-fireproof area 14 include at least one non-fireproof prepreg layer 21, that is, the non-fireproof prepreg layer 21 can be arranged in one or more layers according to actual needs and integrally molded into the non-fireproof area 14 by compression molding.

[0043] Specifically, referring to Figure 3 As shown, the fireproof area 13 is formed by compression molding multiple non-fireproof prepreg layers 21 and one fireproof prepreg layer 22, and the multiple non-fireproof prepreg layers 21 can be arranged on the same side of the fireproof prepreg layer 22. Exemplarily, the fireproof area 13 is formed by compression molding four non-fireproof prepreg layers 21 and one fireproof prepreg layer 22, and the four non-fireproof prepreg layers 21 are arranged on the same side of the fireproof prepreg layer 22.

[0044] Referring to Figure 4As shown, the fireproof zone 13 is formed by molding multiple layers of non-fireproof prepreg layers 21 and one layer of fireproof prepreg layer 22. The multiple layers of non-fireproof prepreg layers 21 can be arranged on both sides of the fireproof prepreg layer 22. Exemplarily, the fireproof zone 13 is formed by molding four layers of non-fireproof prepreg layers 21 and one layer of fireproof prepreg layer 22, and the fireproof prepreg layer 22 is located between three of the non-fireproof prepreg layers 21 and the remaining one non-fireproof prepreg layer 21.

[0045] Referring to Figure 5 As shown, the fireproof zone 13 is formed by molding multiple layers of non-fireproof prepreg layers 21 and multiple layers of fireproof prepreg layers 22. The multiple layers of non-fireproof prepreg layers 21 and the multiple layers of fireproof prepreg layers 22 can be arranged in a cross-laminated manner in sequence. Exemplarily, the fireproof zone 13 is formed by molding five layers of non-fireproof prepreg layers 21 and two layers of fireproof prepreg layers 22, and each fireproof prepreg layer 22 is located between two of the non-fireproof prepreg layers 21.

[0046] It should be noted that the non-fireproof prepreg layers 21 and the fireproof prepreg layers 22 forming the fireproof zone 13 and the non-fireproof zone 14 can also be arranged and numbered in other ways. The present disclosure does not limit this, as long as the fireproof zone 13 and the non-fireproof zone 14 can be formed by molding on the battery cover to achieve thermal runaway protection of the battery cover.

[0047] In some embodiments, the thickness of the non-fireproof prepreg layer 21 is greater than or equal to 0.2 mm and less than or equal to 1 mm, which can avoid occupying too much space due to the excessive thickness of the battery cover while ensuring the structural strength of the battery cover. The thickness of the fireproof prepreg layer 22 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so as to ensure that the fireproof prepreg layer 22 has a relatively thick thickness, thereby ensuring that the fireproof prepreg layer 22 has good fireproof ability.

[0048] Specifically, the ratio of the thickness of the fireproof prepreg layer 22 to the thickness of the non-fireproof prepreg layer 21 is greater than or equal to 1.0 and less than or equal to 3. That is, the thickness of the fireproof prepreg layer 22 is not less than the thickness of the non-fireproof prepreg layer 21. On the one hand, compared with the non-fireproof prepreg layer 21, the fireproof prepreg layer 22 can be prepared by directly adding ceramic-based silicone rubber to the resin matrix used to form the non-fireproof prepreg layer 21, so that the thickness of the obtained fireproof prepreg layer 22 is greater than or equal to the thickness of the non-fireproof prepreg layer 21. On the other hand, according to the fireproof performance requirements of the battery cover, the thickness of the fireproof prepreg layer 22 can be appropriately increased to ensure that the battery cover has good fireproof ability. Secondly, the thickness of the fireproof prepreg layer 22 should not be too large. The ratio of the thickness of the fireproof prepreg layer 22 to the thickness of the non-fireproof prepreg layer 21 needs to not exceed 3. On the one hand, it can avoid the poor structural stability of the molded structure due to the too large difference between the two. On the other hand, it can avoid the overall thickness of the molded battery cover being too thick due to the relatively thick thickness of the fireproof prepreg layer 22.

[0049] In a specific implementation, the thickness of the non-fireproof prepreg layer 21 and the thickness of the fireproof prepreg layer 22 can be set to be relatively close, and a certain difference is allowed. Such a setting can avoid forming a large thickness difference at the connection between the fireproof area 13 and the non-fireproof area 14.

[0050] Furthermore, the ratio of the thickness of the upper cover body 1 corresponding to the fireproof area 13 to the thickness of the non-fireproof prepreg layer 21 is greater than or equal to 2.0 and less than or equal to 30, that is, the thickness of the upper cover body 1 corresponding to the fireproof area 13 is greater than or equal to 0.4 mm and less than or equal to 30 mm. Such a setting ensures that the fireproof area 13 is at least formed by molding one layer of non-fireproof prepreg layer 21 and one layer of fireproof prepreg layer 22, so as to ensure that the fireproof area 13 has sufficient structural strength; at the same time, the thickness of the upper cover body 1 corresponding to the fireproof area 13 should not be too large to avoid occupying too much space.

[0051] In some embodiments, the thickness of the fireproof prepreg layer 22 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, and the thickness of the upper cover body 1 corresponding to the fireproof area 13 is greater than or equal to 0.4 mm and less than or equal to 6 mm.

[0052] It can be understood that the fireproof area 13 is formed by molding at least one layer of non-fireproof prepreg layer 21 and at least one layer of fireproof prepreg layer 22. At the same time, the total number of layers of the non-fireproof prepreg layer 21 and the fireproof prepreg layer 22 is between 4 and 6, which can ensure that the battery upper cover has a certain structural strength and a thermal runaway protection function. Compared with the mica board protection method, the thickness of the upper cover body 1 corresponding to the fireproof area 13 can be reduced by 0.2 to 1 mm, which can avoid occupying too much space due to the excessive thickness of the battery upper cover. The saved space can be used to increase the battery power, thereby improving the vehicle's cruising range.

[0053] It should be noted that the ratio of the thickness of the fireproof prepreg layer 22 to the thickness of the non-fireproof prepreg layer 21 and the ratio of the thickness of the upper cover body 1 corresponding to the fireproof area 13 to the thickness of the non-fireproof prepreg layer 21 are preferably such that the fireproof area 13 of the upper cover body 1 has high structural strength and good fireproof function, and at the same time is not too thick to occupy too much space. When the above conditions are met, the battery upper cover can meet the use requirements.

[0054] Of course, it should be noted that the non-fireproof prepreg layer 21, the fireproof prepreg layer 2, and the upper cover body 1 corresponding to the fireproof area 13 can also be other thicknesses, and the present disclosure does not limit this, and can be specifically set according to actual needs.

[0055] In some embodiments, the non-fireproof prepreg layer 21 includes a resin matrix and a glass fiber layer 23 impregnated in the resin matrix. That is to say, impregnating the glass fiber layer 23 in the resin matrix can form the non-fireproof prepreg layer 21. The fireproof prepreg layer 22 includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer 23 impregnated in the resin matrix.

[0056] It can be understood that impregnating the glass fiber layer 23 in a matrix mixed with ceramic-based silicone rubber and a resin matrix can form the fireproof prepreg layer 22. In specific implementation, the ceramic-based silicone rubber can be uniformly mixed with the resin matrix to ensure the fireproof performance of the fireproof prepreg layer 22.

[0057] It can be understood that the ceramic-based silicone rubber can be ceramized and converted into a high-strength refractory layer under high-temperature flame burning. When the battery module has a thermal runaway, the ceramic-based silicone rubber can be converted into a high-temperature refractory layer, thereby playing a role in protecting the battery module from thermal runaway.

[0058] It should be noted that the fireproof material can also be other materials other than ceramic-based silicone rubber. The present disclosure does not limit this, as long as it can be integrated into the prepreg layer 2 to form the fireproof prepreg layer 22, so that the battery upper cover can be protected from thermal runaway.

[0059] In some embodiments, the upper cover body 1 includes a top plate portion 11 and side plate portions 12 connected to the edges of the top plate portion 11. At least part of the area of the top plate portion 11 is formed as a fireproof area 13, and the area of the top plate portion 11 outside the fireproof area 13 and the side plate portions 12 are formed as non-fireproof areas 14.

[0060] Refer to Figure 1 As shown, the side plate portions 12 are provided on the edges on both sides of the top plate portion 11 and can cover the box body of the battery pack. In this way, the sealing effect between the battery upper cover and the box body can be strengthened, and the performance of the battery module arranged between the battery upper cover and the box body can be ensured. In specific implementation, at least the area of the top plate portion 11 corresponding to the battery module forms the fireproof area 13, and the remaining areas form the non-fireproof areas 14, so as to reduce costs.

[0061] Of course, the fireproof area 13 can also be correspondingly arranged at positions where flames are likely to occur. The present disclosure does not limit this, as long as the thermal runaway protection of the battery upper cover can be achieved.

[0062] In specific implementation, both the fire prevention area 13 and the non-fire prevention area 14 are integrally formed by compression molding of multiple prepreg layers 2 arranged in a stacked manner. Among them, at least one layer of the multiple prepreg layers 2 corresponding to the fire prevention area 13 is a fireproof prepreg layer. In specific implementation, at least one fireproof prepreg layer 22 is correspondingly arranged in the pre-designed fire prevention area 13, and at least one non-fireproof prepreg layer 21 is arranged in the non-fire prevention area 14. After the non-fireproof prepreg layer 21 and the fireproof prepreg layer 22 are arranged in a stacked manner, they are integrally formed by compression molding into a battery upper cover with a fire prevention area 13 and a non-fire prevention area 14, so that the battery upper cover has a fire prevention function, eliminating the need for additional pasting of mica plates for fire prevention, simplifying the assembly process, and reducing the production cost.

[0063] In some embodiments, the thickness of the upper cover body 1 corresponding to the fire prevention area 13 is equal to the thickness of the upper cover body 1 corresponding to the non-fire prevention area 14. In specific implementation, the thickness, quantity, arrangement method, etc. of the non-fireproof prepreg layer 21 and the fireproof prepreg layer 22 are not limited in this disclosure, as long as the thickness of the upper cover body 1 corresponding to the fire prevention area 13 can be made equal to the thickness of the upper cover body 1 corresponding to the non-fire prevention area 14 through reasonable arrangement.

[0064] Of course, in some other embodiments, referring to Figure 2 As shown, the thickness of the upper cover body 1 corresponding to the fire prevention area 13 is not equal to the thickness of the upper cover body 1 corresponding to the non-fire prevention area 14, and a thickness step difference is formed between the upper cover body 1 corresponding to the fire prevention area 13 and the upper cover body 1 corresponding to the non-fire prevention area 14. Therefore, the connection between the fire prevention area 13 and the non-fire prevention area 14 is smoothly connected with a rounded corner. Specifically, the rounded corner transition can be integrally formed during compression molding. In specific implementation, the radius of the rounded corner is between 1 mm and 20 mm.

[0065] The battery upper cover provided by the embodiments of this disclosure has the following advantages:

[0066] (1) The upper cover body of the battery upper cover can be integrally formed by compression molding, simplifying the number of components and eliminating the assembly process of the original mica plate or other separate fireproof materials;

[0067] (2) Due to the integration advantage, the total thickness of this battery upper cover can be reduced by 0.2 to 1 mm compared with the mica plate protection method, saving space to increase the battery power, and thus improving the vehicle's cruising range;

[0068] (3) This battery upper cover has the advantages of light weight and low cost;

[0069] (4) This battery upper cover has good flame burning resistance and structural retention performance under fire, avoiding the risk of mica plate detachment in the mica plate protection method and improving the safety of power batteries and vehicles.

[0070] Some other embodiments of the present disclosure provide a battery pack, including a box body, a battery module, and a battery upper cover as described in any one of the above. The battery upper cover is disposed on the box body, and an accommodation space is formed between the battery upper cover and the box body. The battery module is disposed in the accommodation space.

[0071] The battery pack provided by the embodiments of the present disclosure includes the battery upper cover of any one of the above embodiments, and thus has the beneficial effects of the battery upper cover of any one of the above embodiments, which will not be elaborated herein.

[0072] It can be understood that the battery module is disposed in the accommodation space. The battery upper cover can not only play a role in thermal runaway protection, but also seal and structurally protect the battery module, ensuring the normal use of the battery module and further ensuring the use performance of the vehicle.

[0073] Some other embodiments of the present disclosure provide a vehicle, including the battery pack as described in any one of the above embodiments.

[0074] The vehicle provided by the embodiments of the present disclosure includes the battery pack of any one of the above embodiments, and thus has the beneficial effects of the battery pack of any one of the above embodiments, which will not be elaborated herein.

[0075] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article, or device comprising the element.

[0076] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover, characterized in that: The upper cover body is formed by molding a plurality of prepreg layers stacked in layers, and the upper cover body includes a fireproof area and a non-fireproof area surrounding the edges of the fireproof area. Wherein, at least one of the multiple prepreg layers in the fire protection zone is a fire-resistant prepreg layer.

2. The battery cover according to claim 1, characterized in that: The multiple layers of prepreg layers in the fireproof zone include at least one non-fireproof prepreg layer and at least one fireproof prepreg layer, and the non-fireproof prepreg layer and the fireproof prepreg layer are stacked; The multiple prepreg layers in the non-fireproof zone include at least one non-fireproof prepreg layer.

3. The battery cover according to claim 2, characterized in that: The thickness of the non-fireproof prepreg layer is greater than or equal to 0.2 mm and less than or equal to 1 mm, and the thickness of the fireproof prepreg layer is greater than or equal to 0.2 mm and less than or equal to 1.5 mm; The ratio of the thickness of the fireproof prepreg layer to the thickness of the non-fireproof prepreg layer is greater than or equal to 1.0 and less than or equal to 3; The ratio of the thickness of the upper cover body corresponding to the fire protection zone to the thickness of the non-fire protection prepreg layer is greater than or equal to 2.0 and less than or equal to 30.

4. The battery cover according to claim 1, characterized in that: The thickness of the fireproof prepreg layer is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, and the thickness of the upper cover body corresponding to the fireproof zone is greater than or equal to 0.4 mm and less than or equal to 6 mm.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The upper cover body includes a top plate portion and a side plate portion connected to the edge of the top plate portion, at least a portion of the top plate portion is formed as the fireproof zone, and the area of ​​the top plate portion outside the fireproof zone and the side plate portion are formed as the non-fireproof zone.

6. The battery cover according to claim 5, characterized in that: The thickness of the upper cover body corresponding to the fire protection zone is equal to the thickness of the upper cover body corresponding to the non-fire protection zone.

7. The battery cover according to claim 5, characterized in that: The thickness of the upper cover body corresponding to the fireproof area is not equal to the thickness of the upper cover body corresponding to the non-fireproof area, and the connection between the fireproof area and the non-fireproof area is connected with a rounded corner for smooth transition.

8. A battery pack, characterized in that: It comprises a box body, a battery module and a battery cover as claimed in any one of claims 1 to 7, wherein the battery cover is arranged on the box body, a receiving space is formed between the battery cover and the box body, and the battery module is arranged in the receiving space.

9. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 8.

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