Battery upper cover, battery pack, and vehicle

Abstract

The present disclosure 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 compression-molded as one piece from a plurality of prepreg layers arranged in a stacked manner, and the upper cover body comprises a fireproof zone and a non-fireproof zone surrounding the peripheral edge of the fireproof zone. At least one of the plurality of prepreg layers in the fireproof zone is a fireproof prepreg layer.

Description

Battery cover, battery pack and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420289129.8 and application date of February 7, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present disclosure relates to the technical field of power batteries, and in particular to a battery cover, a battery pack, and a vehicle. Background Art

[0004] New energy vehicles have experienced rapid growth in recent years, thanks to their low energy consumption, excellent driving performance, environmental friendliness, and advanced technology. New energy power batteries typically utilize lithium-ion batteries, which pose a risk of thermal runaway under conditions such as overcharging, overheating, and excessive compression. This can lead to fire hazards in the battery pack, necessitating comprehensive protection of the power battery pack.

[0005] The existing battery pack cover usually has a mica board attached to the bottom surface of the cover or above the module using double-sided tape. In the event of thermal runaway, the mica board can prevent the flame from burning the cover and prevent the flame from burning through the cover. However, due to the heavy weight of the mica board, there is a risk of failure of the double-sided tape when burned by the flame, causing the mica board to detach from the battery pack cover, affecting the fireproof effect of the cover; the mica board vertically arranged on the cover will occupy more internal space of the battery pack, affecting the battery capacity. At the same time, the assembly process of the mica board is relatively complicated, affecting the installation efficiency of the cover. Summary of the Invention

[0006] In order to solve the above technical problems, the present disclosure provides a battery cover, a battery pack and a vehicle.

[0007] A first aspect of the present disclosure provides a battery upper cover, comprising an upper cover body, the upper cover body being integrally formed by molding multiple layers of stacked prepreg layers, the upper cover body comprising a fireproof area and a non-fireproof area surrounding the edges of the fireproof area;

[0008] Wherein, at least one of the multiple prepreg layers in the fire protection zone is a fire-resistant prepreg layer.

[0009] Optionally, the multiple 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;

[0010] The multiple prepreg layers in the non-fireproof zone include at least one non-fireproof prepreg layer.

[0011] Optionally, 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;

[0012] 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;

[0013] 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.

[0014] Optionally, the non-fireproof prepreg layer includes a resin matrix and a glass fiber layer impregnated in the resin matrix;

[0015] The fireproof prepreg layer includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer impregnated in the resin matrix.

[0016] Optionally, 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.

[0017] 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 portion of the top plate portion is formed as the fire protection zone, and the area of ​​the top plate portion outside the fire protection zone and the side plate portion are formed as the non-fire protection zone.

[0018] Optionally, 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.

[0019] Optionally, the thickness of the upper cover body corresponding to the fire protection zone is not equal to the thickness of the upper cover body corresponding to the non-fire protection zone, and the connection between the fire protection zone and the non-fire protection zone is connected with a smooth transition of rounded corners.

[0020] A second aspect of the present disclosure provides a battery upper cover, comprising an upper cover body, wherein the upper cover body is integrally formed by compression molding of multiple stacked prepreg layers, wherein at least one layer of the multiple prepreg layers is a fireproof prepreg layer.

[0021] Optionally, the multilayer prepreg layer includes 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.

[0022] Optionally, 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.

[0023] Optionally, the non-fireproof prepreg layer includes a resin matrix and a glass fiber layer impregnated in the resin matrix; the fireproof prepreg layer includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer impregnated in the resin matrix.

[0024] A third aspect of the present disclosure provides a battery pack, comprising a case, a battery module and a battery cover as described above, wherein the battery cover is arranged on the case, and a storage space is formed between the battery cover and the case, and the battery module is arranged in the storage space.

[0025] A fourth aspect of the present disclosure provides a vehicle comprising the battery pack as described above.

[0026] The technical solution provided by the present disclosure has the following advantages compared with the existing technology:

[0027] The battery cover, battery pack and vehicle provided by the present disclosure include a cover body, which is formed as a whole by molding multiple layers of prepreg layers stacked together. At least one layer of the multiple layers of prepreg is a fireproof prepreg layer, that is, the fireproof prepreg layer has a fireproof function, so that the battery cover molded by the fireproof prepreg layer has a fireproof function. At the same time, by arranging multiple layers of prepreg layers, the battery cover can have a certain structural strength. In specific implementation, at least part of the area of ​​the battery cover is formed as a fireproof zone, and thermal runaway protection can be performed on this part of the area, while ensuring the fireproof function and reducing the molding cost of the battery cover. Compared with the protection method of mica board or other separate fireproof materials, it can simplify the number of parts and eliminate the original assembly process. While having good flame resistance and structural retention performance under fire, it avoids the risk of mica board detachment, improves the safety of the battery pack and the vehicle, and can also save space to increase battery power, thereby improving the cruising range of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0029] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic structural diagram of a battery cover according to an embodiment of the present disclosure;

[0031] FIG2 is a schematic diagram showing the connection between the fire protection zone and the non-fire protection zone according to an embodiment of the present disclosure;

[0032] FIG3 is a schematic structural diagram of a fireproof prepreg layer according to an embodiment of the present disclosure;

[0033] FIG4 is a schematic structural diagram of a fireproof prepreg layer according to another embodiment of the present disclosure;

[0034] FIG5 is a schematic structural diagram of a fireproof prepreg layer according to another embodiment of the present disclosure.

[0035] Figure numerals: 1. Upper cover body; 11. Top plate; 12. Side plate; 13. Fireproof area; 14. Non-fireproof area; 2. Prepreg layer; 21. Non-fireproof prepreg layer; 22. Fireproof prepreg layer; 23. Glass fiber layer. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0038] The battery cover, battery pack and vehicle disclosed in the present invention are described in detail below through specific embodiments:

[0039] 1 to 5 , a first embodiment of the present disclosure provides a battery top cover, including a top cover body 1. The top cover body 1 is integrally molded from a plurality of stacked prepreg layers 2. The molded top cover body 1 includes a fireproof zone 13 and a non-fireproof zone 14 surrounding the edges of the fireproof zone 13. The fireproof zone 13 is arranged corresponding to the battery module so that thermal runaway protection can be performed through the fireproof zone 13 when thermal runaway occurs in the battery module.

[0040] Specifically, the upper cover body 1 is formed by thermosetting prepreg compression molding (PCM for short), which is easy to process.

[0041] Among them, at least one layer of the multi-layer prepreg layer 2 of the fireproof zone 13 is a fireproof prepreg layer 22. That is, the fireproof prepreg layer 22 has a fireproof function, so that the fireproof zone 13 molded by the fireproof prepreg layer 22 has a fireproof function.

[0042] This arrangement allows the battery cover to be directly formed during the integral molding process, creating a fireproof zone 13 with fire protection capabilities, and a non-fireproof zone 14 surrounding the fireproof zone 13. Furthermore, the provision of multiple prepreg layers 2 provides the battery cover with a certain degree of structural strength. In practice, at least a portion of the upper cover body 1 forms the fireproof zone 13, enabling thermal runaway protection in this area. This ensures fire protection while reducing the cost of forming the battery cover.

[0043] Compared with the protection method of mica board or other separate fireproof materials, the battery cover provided by the embodiment of the present disclosure can simplify the number of parts and eliminate the original assembly process. While having good flame resistance and structural retention performance in the event of fire, it avoids the risk of mica board detachment, improves the safety of the battery pack and the vehicle, and can also save space to increase battery power, thereby improving the cruising range of the entire vehicle.

[0044] 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.

[0045] In some embodiments, the multilayer prepreg layer 2 of the fire protection zone 13 includes at least one non-fire protection prepreg layer 21 and at least one fire protection prepreg layer 22. That is, the non-fire protection prepreg layer 21 can be provided with one or more layers, and the fire protection prepreg layer 22 can also be provided with one or more layers. According to the thickness of different battery covers and the requirements of fire protection performance, one or more layers of non-fire protection prepreg layers 21 are combined with one or more layers of fire protection prepreg layers 22 in a set stacking sequence, and finally formed into a fire protection zone 13 through molding.

[0046] The multilayer prepreg layer 2 of the non-fireproof zone 14 includes at least one non-fireproof prepreg layer 21, that is, the non-fireproof prepreg layer 21 can be provided with one or more layers according to actual needs, and is integrally formed into the non-fireproof zone 14 by molding.

[0047] In a specific implementation, as shown in FIG3 , 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 the same side 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 four layers of non-fireproof prepreg layers 21 are arranged on the same side of the fireproof prepreg layer 22.

[0048] 4 , the fireproof zone 13 is formed by compression 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 compression molding four layers of non-fireproof prepreg layers 21 and one layer of fireproof prepreg layer 22, with the fireproof prepreg layer 22 being located between three of the non-fireproof prepreg layers 21 and the remaining non-fireproof prepreg layer 21.

[0049] As shown in Figure 5, 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 cross-stacked 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, with each fireproof prepreg layer 22 located between two of the non-fireproof prepreg layers 21.

[0050] It should be noted that the non-fireproof prepreg layer 21 and the fireproof prepreg layer 22 that form the fireproof zone 13 and the non-fireproof zone 14 can also be arranged in other ways and quantities. The present disclosure does not limit this. As long as the fireproof zone 13 and the non-fireproof zone 14 can be molded on the battery cover to achieve thermal runaway protection of the battery cover, it will be sufficient.

[0051] 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, ensuring the structural strength of the battery cover while preventing the battery cover from being too thick and occupying too much space. 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, ensuring that the fireproof prepreg layer 22 is relatively thick and has good fire protection capabilities.

[0052] 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 prepared fireproof prepreg layer 22 is greater than or equal to the thickness of the non-fireproof prepreg layer 21. On the other hand, the thickness of the fireproof prepreg layer 22 can be appropriately increased according to the requirements of the battery cover for fireproof performance, thereby ensuring 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 be no more than 3. On the one hand, it avoids the difference between the two being too large, resulting in poor structural stability of the molded structure. On the other hand, it avoids the thickness of the fireproof prepreg layer 22 being too thick, resulting in a thicker overall thickness of the molded battery cover.

[0053] 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 a relatively close thickness, and a certain difference is allowed. Such a setting can avoid the formation of a large thickness difference at the connection between the fireproof zone 13 and the non-fireproof zone 14.

[0054] Furthermore, the ratio of the thickness of the upper cover body 1 corresponding to the fireproof zone 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. In other words, the thickness of the upper cover body 1 corresponding to the fireproof zone 13 is greater than or equal to 0.4 mm and less than or equal to 30 mm. This configuration ensures that the fireproof zone 13 is compression-molded from at least one layer of non-fireproof prepreg layer 21 and one layer of fireproof prepreg layer 22, thereby ensuring that the fireproof zone 13 has sufficient structural strength. At the same time, the thickness of the upper cover body 1 corresponding to the fireproof zone 13 should not be too large to avoid occupying too much space.

[0055] 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.

[0056] It can be understood that the fire protection zone 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 non-fireproof prepreg layer 21 and fireproof prepreg layer 22 is between 4 and 6 layers, which can ensure that the battery cover has a certain structural strength while having thermal runaway protection function. Compared with the thickness of the cover body 1 corresponding to the fire protection zone 13, the mica board protection method can be reduced by 0.2 to 1 mm, which can avoid the battery cover from occupying too much space due to being too thick. The saved space can be used to increase the battery power, thereby improving the vehicle's cruising range.

[0057] 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 zone 13 to the thickness of the non-fireproof prepreg layer 21 are to ensure that the fireproof zone 13 of the upper cover body 1 has a higher structural strength and better fireproof function, while not being too thick and occupying too much space. When the above conditions are met, the battery cover can meet the usage requirements.

[0058] 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 zone 13 can also be of other thicknesses. This disclosure does not limit this and can be specifically set according to actual needs.

[0059] 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, the non-fireproof prepreg layer 21 can be formed by impregnating the glass fiber layer 23 in the resin matrix. 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.

[0060] It is understood that the glass fiber layer 23 is impregnated in a matrix of ceramic-based silicone rubber and a resin matrix to form a fire-resistant prepreg layer 22. In a specific implementation, the ceramic-based silicone rubber can be evenly mixed with the resin matrix to ensure the fireproof performance of the fire-resistant prepreg layer 22.

[0061] It is understood that ceramic-based silicone rubber can be ceramicized under high-temperature flames and converted into a high-strength fire-resistant layer. When a battery module experiences thermal runaway, the ceramic-based silicone rubber can be converted into a high-temperature fire-resistant layer, thereby providing thermal runaway protection for the battery module.

[0062] It should be noted that the fireproof material can also be other materials besides ceramic-based silicone rubber, and the present disclosure does not limit this. As long as it can be integrated into the prepreg layer 2 to form a fireproof prepreg layer 22, so that the battery cover can be protected from thermal runaway.

[0063] In some embodiments, the upper cover body 1 includes a top plate portion 11 and a side plate portion 12 connected to the edge of the top plate portion 11, at least a portion of the top plate portion 11 is formed as a fire protection zone 13, and the area of ​​the top plate portion 11 outside the fire protection zone 13 and the side plate portion 12 are formed as a non-fire protection zone 14.

[0064] As shown in Figure 1 , the side panels 12 are positioned on the edges of the top panel 11 on both sides and can be placed over the battery pack housing. This strengthens the seal between the battery cover and the housing, ensuring the performance of the battery modules housed within. In a specific implementation, at least the area of ​​the top panel 11 corresponding to the battery modules forms a fireproof zone 13, while the remaining area forms a non-fireproof zone 14, thereby reducing costs.

[0065] Of course, the fire protection zone 13 can also be set at a location where flames are likely to occur. This disclosure does not limit this, as long as thermal runaway protection of the battery cover can be achieved.

[0066] In a specific implementation, the fireproof zone 13 and the non-fireproof zone 14 are both formed by compression molding of the stacked multi-layer prepreg layers 2, wherein at least one layer of the multi-layer prepreg layers 2 corresponding to the fireproof zone 13 is a fireproof prepreg layer. In a specific implementation, at least one layer of fireproof prepreg layer 22 is provided corresponding to the pre-designed fireproof zone 13, and at least one layer of non-fireproof prepreg layer 21 is provided in the non-fireproof zone 14. After the non-fireproof prepreg layer 21 and the fireproof prepreg layer 22 are stacked, they are molded into a battery cover having the fireproof zone 13 and the non-fireproof zone 14, so that the battery cover has a fireproof function, and there is no need to additionally stick mica boards for fire protection, which simplifies the assembly process and reduces production costs.

[0067] In some embodiments, the thickness of the upper cover body 1 corresponding to the fireproof zone 13 is equal to the thickness of the upper cover body 1 corresponding to the non-fireproof zone 14. In specific implementation, the thickness, quantity, and arrangement of the non-fireproof prepreg layers 21 and the fireproof prepreg layers 22 are not limited in this disclosure, as long as the thickness of the upper cover body 1 corresponding to the fireproof zone 13 and the thickness of the upper cover body 1 corresponding to the non-fireproof zone 14 can be equal through reasonable arrangement.

[0068] Of course, in other embodiments, as shown in FIG. 2 , the thickness of the upper cover body 1 corresponding to the fireproof zone 13 is not equal to the thickness of the upper cover body 1 corresponding to the non-fireproof zone 14, and a thickness step is formed between the upper cover body 1 corresponding to the fireproof zone 13 and the upper cover body 1 corresponding to the non-fireproof zone 14. Therefore, the connection between the fireproof zone 13 and the non-fireproof zone 14 is smoothly connected by a rounded corner. Specifically, the rounded corner transition can be integrally formed during the molding process. In a specific implementation, the radius of the rounded corner is between 1 mm and 20 mm.

[0069] The battery cover provided by the embodiment of the present disclosure has the following advantages:

[0070] (1) The upper cover of the battery can be formed by integral molding, which simplifies the number of parts and eliminates the assembly process of the original mica board or other separate fireproof materials;

[0071] (2) Due to its integrated advantages, the total thickness of the battery cover can be reduced by 0.2 to 1 mm compared to the mica board protection method, which can save space to increase battery power and thus improve the vehicle's range;

[0072] (3) The battery cover has the advantages of being lightweight and low-cost;

[0073] (4) The battery cover has good flame resistance and structural retention performance in the event of fire, avoiding the risk of mica board detachment in the mica board protection method, and improving the safety of power batteries and vehicles.

[0074] A second embodiment of the present disclosure provides a battery cover, including a cover body. The cover body is integrally molded from multiple stacked prepreg layers, at least one of which is a fireproof prepreg layer. Unlike the first embodiment, the cover body of the second embodiment may not include a non-fireproof zone. In other words, the entire cover body of the second embodiment may be a fireproof zone.

[0075] Specifically, the upper cover body is molded using thermosetting prepreg (Propreg Compression Molding, PCM) for ease of processing. At least one of the multiple prepreg layers is a fireproof prepreg layer. It is understood that the fireproof prepreg layer has a fireproof function, thereby making the upper cover body molded from the fireproof prepreg layer also fireproof.

[0076] With such a configuration, the battery cover can directly have a fireproof function when it is molded as a whole. At the same time, by providing multiple layers of prepreg layers, the battery cover can have a certain structural strength.

[0077] Compared with the protection method of mica board or other separate fireproof materials, the battery cover provided by the embodiment of the present disclosure can simplify the number of parts and eliminate the original assembly process. While having good flame resistance and structural retention performance in the event of fire, it avoids the risk of mica board detachment, improves the safety of the battery pack and the vehicle, and can also save space to increase battery power, thereby improving the cruising range of the entire vehicle.

[0078] It should be noted that the upper cover body 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 connection with the box body of the battery pack.

[0079] In some embodiments, the multi-layer prepreg layer includes at least one non-fireproof prepreg layer and at least one fireproof prepreg layer, that is, the non-fireproof prepreg layer can be provided as one or more layers, and the fireproof prepreg layer can also be provided as one or more layers. According to the thickness and fireproof performance requirements of different battery covers, one or more non-fireproof prepreg layers are combined with one or more fireproof prepreg layers in a set stacking order, and finally formed into a battery cover through molding.

[0080] Of course, in some other embodiments, the multiple prepreg layers may all be fireproof prepreg layers.

[0081] In some embodiments, the multi-layer prepreg layer includes multiple layers of non-fireproof prepreg layers and one layer of fireproof prepreg layer. The multiple layers of non-fireproof prepreg layers can be arranged on the same side of the fireproof prepreg layer, or they can be arranged on both sides of the fireproof prepreg layer.

[0082] As an example, the multiple layers of prepreg layers may include four non-fireproof prepreg layers and one fireproof prepreg layer, wherein the four non-fireproof prepreg layers are arranged on the same side of the fireproof prepreg layer.

[0083] As another example, the multi-layer prepreg layer includes four non-fireproof prepreg layers and one fireproof prepreg layer, and the fireproof prepreg layer is located between three of the non-fireproof prepreg layers and the remaining one non-fireproof prepreg layer.

[0084] In some embodiments, the multilayer prepreg layer includes multiple layers of non-fireproof prepreg layers and multiple layers of fireproof prepreg layers, and the multiple layers of non-fireproof prepreg layers and the multiple layers of fireproof prepreg layers can be cross-stacked in sequence. As an example, each fireproof prepreg layer is located between two layers of non-fireproof prepreg layers.

[0085] It should be noted that the non-fireproof prepreg layers and the fireproof prepreg layers may also be arranged in other ways and quantities, which is not limited in the present disclosure, as long as the thermal runaway protection requirements of the battery cover can be achieved.

[0086] In some embodiments, 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, ensuring the structural strength of the battery cover while preventing the battery cover from being too thick and occupying too much space. 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, ensuring that the fireproof prepreg layer 22 is relatively thick, thereby ensuring that the fireproof prepreg layer 22 has good fire protection capabilities.

[0087] Specifically, 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. That is, the thickness of the fireproof prepreg layer is not less than the thickness of the non-fireproof prepreg layer. On the one hand, compared with the non-fireproof prepreg layer, the fireproof prepreg layer can be prepared by directly adding ceramic-based silicone rubber to the resin matrix used to form the non-fireproof prepreg layer, so that the thickness of the prepared fireproof prepreg layer is greater than or equal to the thickness of the non-fireproof prepreg layer. On the other hand, the thickness of the fireproof prepreg layer can be appropriately increased according to the requirements of the battery cover for fireproof performance, thereby ensuring that the battery cover has good fireproof ability. Secondly, the thickness of the fireproof prepreg layer should not be too large. The ratio of the thickness of the fireproof prepreg layer to the thickness of the non-fireproof prepreg layer needs to be no more than 3. On the one hand, it avoids the difference between the two being too large, resulting in poor structural stability of the compression molding, and on the other hand, it avoids the thickness of the fireproof prepreg layer being too thick, resulting in a thicker overall thickness of the formed battery cover.

[0088] In some embodiments, the non-fireproof prepreg layer includes a resin matrix and a glass fiber layer impregnated in the resin matrix. That is, the glass fiber layer is impregnated in the resin matrix to form a non-fireproof prepreg layer, and the fireproof prepreg layer includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer impregnated in the resin matrix.

[0089] It is understood that the glass fiber layer can be impregnated in a matrix of ceramic-based silicone rubber and a resin matrix to form a fire-resistant prepreg layer. In a specific implementation, the ceramic-based silicone rubber can be evenly mixed with the resin matrix to ensure the fire-resistant performance of the fire-resistant prepreg layer.

[0090] It is understood that ceramic-based silicone rubber can be ceramicized under high-temperature flames and converted into a high-strength fire-resistant layer. When a battery module experiences thermal runaway, the ceramic-based silicone rubber can be converted into a high-temperature fire-resistant layer, thereby providing thermal runaway protection for the battery module.

[0091] It should be noted that the fireproof material can also be other materials besides ceramic-based silicone rubber, and the present disclosure does not limit this. As long as it can be integrated into the prepreg layer to form a fireproof prepreg layer, so that the battery cover can be protected from thermal runaway.

[0092] Still other embodiments of the present disclosure provide a battery pack comprising a case, a battery module, and a battery cover as described above, wherein the battery cover is disposed on the case, a receiving space is formed between the battery cover and the case, and the battery module is disposed in the receiving space.

[0093] The battery pack provided in the embodiment of the present disclosure includes the battery cover of any of the above embodiments, and thus has the beneficial effects of the battery cover of any of the above embodiments, which will not be described in detail here.

[0094] It can be understood that the battery module is arranged in the accommodation space, and the battery cover can not only play a role in thermal runaway protection, but also seal and structurally protect the battery module, thereby ensuring the normal use of the battery module and thus ensuring the performance of the vehicle.

[0095] Other embodiments of the present disclosure provide a vehicle comprising a battery pack according to any of the above embodiments.

[0096] The vehicle provided in the embodiment of the present disclosure includes the battery pack of any of the above embodiments, and thus has the beneficial effects of the battery pack of any of the above embodiments, which will not be described in detail here.

[0097] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0098] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover, comprising a cover body, the cover body being integrally formed by compression molding of multiple stacked prepreg layers, the cover body comprising a fireproof zone and a non-fireproof zone surrounding the fireproof zone; in, At least one of the multiple prepreg layers in the fire protection zone is a fire protection prepreg layer.

2. The battery cover according to claim 1, wherein: 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, wherein: 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 2 or 3, wherein: The non-fireproof prepreg layer includes a resin matrix and a glass fiber layer impregnated in the resin matrix; The fireproof prepreg layer includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer impregnated in the resin matrix.

5. The battery cover according to any one of claims 1 to 4, wherein: 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.

6. The battery cover according to any one of claims 1 to 5, wherein: 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 fire protection zone, and the area of the top plate portion located outside the fire protection zone and the side plate portion are formed as the non-fire protection zone.

7. The battery cover according to claim 6, wherein: 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.

8. The battery cover according to claim 6 or 7, wherein: 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 smoothly connected with a rounded corner.

9. A battery upper cover, comprising an upper cover body, wherein the upper cover body is integrally formed by compression molding of multiple stacked prepreg layers, wherein at least one layer of the multiple prepreg layers is a fireproof prepreg layer.

10. The battery cover according to claim 9, characterized in that: The multilayer prepreg layer includes 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.

11. The battery cover according to claim 10, 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.

12. The battery cover according to claim 10 or 11, characterized in that: The non-fireproof prepreg layer includes a resin matrix and a glass fiber layer impregnated in the resin matrix; The fireproof prepreg layer includes a resin matrix added with ceramic-based silicone rubber and a glass fiber layer impregnated in the resin matrix.

13. A battery pack comprising a case, a battery module and a battery cover according to any one of claims 1 to 12, wherein the battery cover is arranged on the case, a receiving space is formed between the battery cover and the case, and the battery module is arranged in the receiving space.

14. A vehicle comprising the battery pack according to claim 13.

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