Battery box cover, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery box cover, a battery and electric equipment, the battery box cover comprises a cover body structure, the cover body structure comprises a first composite material layer, a heat insulation layer arranged on one side of the first composite material layer and a second composite material layer arranged on one side of the heat insulation layer far away from the first composite material layer; according to the utility model, the structure of the existing battery box cover is improved, so that the thermal runaway resistance of the battery pack box body can be ensured, the thermal insulation layer is effectively prevented from falling off, and the stability of a thermal protection structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box cover, a battery and an electrical equipment. Background Art

[0002] In the fields of electric vehicles and energy storage systems, when a battery pack undergoes thermal runaway due to external stimuli or other factors, it will cause serious personal injuries and property losses. Among them, as a large component in the battery pack structure, the battery box cover accounts for a considerable part of the weight of the entire battery pack, and its structural design is crucial for improving the thermal management efficiency and the ability to resist thermal runaway of the battery pack.

[0003] To improve the resistance of the battery pack to thermal runaway, the invention patent with the publication number of CN117559070A discloses an adiabatic and fireproof composite material battery box cover for lithium batteries and its manufacturing method. The provided battery box cover includes a composite material layer and a mica layer with an integrated structure. The composite material layer on the outer surface is a stacked layer of SMC sheets, and the mica layer on the inner surface is a stacked layer of mica laminated paper. There is a flash at the edge of the battery box cover, and threaded holes are provided on the flash. The inner surface of the battery box cover has a complete mica layer extending to the edge of the cover.

[0004] The above-mentioned battery box cover sets a mica layer on the inner surface of the composite material layer, and by precisely controlling the preheating die temperature and the staged pressurization of the hydraulic press, the material fluidity and compaction degree are ensured. However, due to the strict control requirements for the glue dosage and thickness in this preparation method, the process production is difficult. The above-mentioned battery box cover may still have problems such as uneven glue thickness resulting in warping of the mica layer on the inner surface, or internal cavities with insecure bonding. In actual application during battery packing, the mica board may fall off, resulting in the cover losing its protection against the thermal runaway of the entire pack. Summary of the Utility Model

[0005] To solve the problems existing in the prior art, the first object of the present utility model is to provide a battery box cover, which can effectively avoid the detachment of the heat insulation layer and improve the stability of the thermal protection structure while ensuring the ability of the battery pack box body to resist thermal runaway by improving the structure of the existing battery box cover.

[0006] The second object of the present utility model is to provide a battery having the above-mentioned battery box cover.

[0007] The third object of the present utility model is to provide an electrical equipment having the above-mentioned battery.

[0008] According to the first object of the present utility model, the present utility model provides a battery box cover, including a cover body structure, and the cover body structure includes a first composite material layer, a heat insulation layer provided on one side of the first composite material layer, and a second composite material layer provided on the side of the heat insulation layer away from the first composite material layer.

[0009] Furthermore, the battery box cover provided by the present utility model may further have the following feature: the heat insulation layer is a mica plate.

[0010] Furthermore, the battery box cover provided by the present utility model may further have the following feature: the thicknesses of the first composite material layer and the second composite material layer are both 0.3 mm to 1.2 mm, and the thickness of the heat insulation layer is 0.5 to 2 mm.

[0011] Furthermore, the battery box cover provided by the present utility model may further have the following feature: it further includes a first connection structure, and the first connection structure is disposed around the edge of the cover body structure; the first composite material layer and the second composite material layer are connected through the first connection structure.

[0012] Furthermore, the battery box cover provided by the present utility model may further have the following feature: the first connection structure includes a first flange provided with a plurality of first threaded holes, a second flange provided with a plurality of second threaded holes, and screws sequentially passing through the first threaded holes and the second threaded holes; the first flange is integrally connected to the first composite material layer, and the second flange is integrally connected to the second composite material layer.

[0013] Furthermore, the battery box cover provided by the present utility model may further have the following feature: it further includes a second connection structure; a plurality of through holes are provided on the heat insulation layer, the second connection structure passes through the through holes, and one end thereof is connected to the first composite material layer and the other end is connected to the second composite material layer.

[0014] Furthermore, the battery box cover provided by the present utility model may further have the following feature: the second connection structure is a connecting column formed by polyurethane or epoxy resin.

[0015] Furthermore, the battery box cover provided by the present utility model may further have the following feature: a plurality of through holes are provided in the middle and the outer periphery of the heat insulation layer.

[0016] According to the purpose of the second aspect of the present utility model, the present utility model further provides a battery, including the battery box cover as described above.

[0017] According to the purpose of the third aspect of the present utility model, the present utility model further provides an electrical equipment, including the battery as described above.

[0018] The beneficial effects of the present utility model are as follows:

[0019] 1. In this application, by separately arranging a first composite material layer and a second composite material layer on both sides of the heat insulation layer, a stable multi-layer structure can be formed. This structure can evenly disperse external forces, reduce structural damage caused by uneven local stress, prevent the heat insulation layer from falling off, and while ensuring the heat runaway resistance of the battery box cover, effectively improve the overall stability and durability of the battery box cover.

[0020] 2. In this application, by arranging a continuous first connection structure at the edge of the cover body structure, it can ensure that the first composite material layer and the second composite material layer are closely attached to form a closed sealing ring, thereby guaranteeing the structural stability of the battery box cover.

[0021] 3. In this application, by arranging a through hole penetrating the heat insulation layer and a second connection structure connecting the first composite material layer and the second composite material layer, the stability of the battery box cover in the vertical direction is increased, thereby maintaining the sealing performance and structural integrity of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model. In these drawings, like reference numerals are used to represent like elements. The drawings in the following description are some embodiments of the present utility model, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic structural diagram of the present utility model;

[0024] Figure 2 is an exploded view of the present utility model;

[0025] Figure 3 is a cross-sectional view of the present utility model;

[0026] Figure 4 is a schematic structural diagram of the heat insulation layer of the present utility model.

[0027] In the figure:

[0028] 1. Cover body structure; 11. First composite material layer; 12. Heat insulation layer; 13. Second composite material layer; 2. First connection structure; 21. First flange edge; 22. Second flange edge; 3. Through hole; 4. Connecting column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0030] The present utility model provides a battery box cover, and the specific structure is as follows:

[0031] A battery box cover, as Figure 1 and Figure 2 shown, includes a cover body structure 1. The cover body structure 1 includes a first composite material layer 11, a heat insulation layer 12 provided on one side of the first composite material layer 11, and a second composite material layer 13 provided on the side of the heat insulation layer 12 away from the first composite material layer 11. In use, by providing the first composite material layer 11 and the second composite material layer 13 on both sides of the heat insulation layer 12 respectively, a stable multi-layer structure can be formed. This structure can evenly disperse external forces, reduce structural damage caused by uneven local stress, prevent the heat insulation layer 12 from falling off, and while ensuring the battery box cover's ability to resist thermal runaway, effectively improve the overall stability and durability of the battery box cover.

[0032] In some embodiments, the heat insulation layer 12 is a mica plate, which can effectively prevent the spread of heat generated by electric arcs or short circuits. Compared with other heat insulation materials, and the mica plate has a lower density, which helps to reduce the overall weight of the battery box.

[0033] In some embodiments, the materials selected for the first composite material layer 11 and the second composite material layer 13 are thermosetting materials, preferably polyurethane and / or epoxy resin, which can provide sufficient support and impact resistance for the battery box cover, protect the heat insulation layer 12 located between them from falling off, and since thermosetting materials only melt into a glassy state at high temperatures and do not catch fire and burn into powder, they have excellent flame retardant and isolation effects. The composite material layer prepared with the above materials can effectively prevent the influence of the external environment on the battery.

[0034] In some embodiments, the thicknesses of the first composite material layer 11 and the second composite material layer 13 are both 0.3 mm to 1.2 mm, preferably 0.5 mm, and the thickness of the heat insulation layer 12 is 0.5 to 2 mm, preferably 0.7 mm. Since the heat insulation layer 12 is sandwiched between the first composite material layer 11 and the second composite material layer 13, this structure can better provide structural support, so the conventional thickness settings of the first composite material layer 11, the second composite material layer 13 and the heat insulation layer 12 can be reduced (the thickness of the conventional composite material layer is above 1.2 mm, the thickness of the heat insulation layer 12 is above 2 mm, and usually an additional adhesive thickness is also included), thereby reducing the weight of the battery box cover, meeting the lightweight requirements of the battery box cover, and improving the space utilization rate in electrical equipment such as electric vehicles.

[0035] In some embodiments, such as Figure 1 and Figure 3 shown, the battery box cover further includes a first connection structure 2, and the first connection structure 2 is disposed around the edge of the cover body structure 1; the first composite material layer 11 and the second composite material layer 13 are connected through the first connection structure 2. By providing the continuous first connection structure 2 at the edge of the cover body structure 1, it can be ensured that the first composite material layer 11 and the second composite material layer 13 are closely attached to form a closed sealing ring, thereby ensuring the structural stability of the battery box cover.

[0036] In a specific embodiment, the first connection structure 2 includes a first flange 21 provided with a plurality of first threaded holes, a second flange 22 provided with a plurality of second threaded holes, and screws sequentially passing through the first threaded holes and the second threaded holes; the first flange 21 is integrally connected to the first composite material layer 11, and the second flange 22 is integrally connected to the second composite material layer 13. This connection method can withstand greater tensile and compressive forces, further ensuring the stability and safety of the battery box cover under various use conditions.

[0037] In some embodiments, such as Figure 3 and Figure 4 shown, the battery box cover further includes a second connection structure; a plurality of through holes 3 are provided on the heat insulation layer 12, the second connection structure passes through the through holes 3, and one end is connected to the first composite material layer 11 and the other end is connected to the second composite material layer 13. The second connection structure directly binds the two composite material layers together through the through holes 3, increasing the stability of the battery box cover in the vertical direction, thereby maintaining the sealing performance and structural integrity of the battery box.

[0038] In some embodiments, the second connecting structure is a connecting column 4 formed of polyurethane or epoxy resin (or other bonding materials). During preparation, polyurethane or epoxy resin is coated at the openings of the through holes 3, and the connecting column 4 with high strength and good toughness can be formed after curing. They can withstand large external forces without being easily broken, ensuring stable connection of the battery box cover under various dynamic loads and ensuring that the heat insulation layer is sandwiched between the two composite material layers without delamination.

[0039] In some embodiments, several through holes 3 are provided in the middle and outer periphery of the heat insulation layer 12, which can form a more uniform stress distribution and avoid deformation or rupture in a local area due to excessive stress.

[0040] The present utility model also provides a battery, including the battery box cover as described above.

[0041] The present utility model also provides an electrical equipment, including the battery as described above.

[0042] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0043] In the description of the present invention, it should be noted that 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 sequence between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0044] In the description of the present invention, it should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In the description of the present invention, unless otherwise stated, the meaning of "several" is two or more.

[0045] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present utility model are only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A battery box cover, characterized in that: The cover structure (1) comprises a first composite material layer (11), a heat insulating layer (12) arranged on one side of the first composite material layer (11), and a second composite material layer (13) arranged on a side of the heat insulating layer (12) away from the first composite material layer (11).

2. The battery box cover according to claim 1, characterized in that: The heat insulation layer (12) is a mica board.

3. The battery box cover according to claim 1, characterized in that: The thickness of the first composite material layer (11) and the second composite material layer (13) are both 0.3 mm to 1.2 mm, and the thickness of the heat insulation layer (12) is 0.5 to 2 mm.

4. The battery box cover according to claim 1, characterized in that: It also comprises a first connection structure (2), the first connection structure (2) being arranged around the edge of the cover structure (1); the first composite material layer (11) and the second composite material layer (13) being connected via the first connection structure (2).

5. The battery box cover according to claim 4, characterized in that: The first connection structure (2) comprises a first flange (21) provided with a plurality of first threaded holes, a second flange (22) provided with a plurality of second threaded holes, and screws passing through the first threaded holes and the second threaded holes in sequence; the first flange (21) is integrally connected to the first composite material layer (11), and the second flange (22) is integrally connected to the second composite material layer (13).

6. The battery box cover according to claim 1, characterized in that: It also comprises a second connection structure; the heat insulation layer (12) is provided with a plurality of through holes (3); the second connection structure is passed through the through holes (3), and one end of the second connection structure is connected to the first composite material layer (11) and the other end is connected to the second composite material layer (13).

7. The battery box cover according to claim 6, characterized in that: The second connection structure is a connection column (4) formed of polyurethane or epoxy resin.

8. The battery box cover according to claim 6, characterized in that: A plurality of through holes (3) are provided in the middle and on the periphery of the heat insulation layer (12).

9. A battery, characterized in that: Comprising a battery box cover as described in any one of claims 1-8.

10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.

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