Fireproof box cover, battery pack and vehicle

Abstract

The utility model relates to a fireproof box cover, a battery pack and a vehicle. The fireproof box cover comprises a first fiber layer, a metal plate, a fireproof film and a second fiber layer, the first fiber layer, the metal plate and the second fiber layer are arranged in sequence, and the fireproof film is attached to the metal plate and located between the metal plate and the second fiber layer. The first fiber layer, the metal plate, the fireproof film and the second fiber layer are of an integrated structure. The fireproof box cover disclosed by the utility model is good in shape follow-up degree, the fireproof performance of the box cover is improved through the fireproof film, flame retardance and heat resistance are effectively realized, the spreading of thermal runaway in a battery pack is avoided, the safety of the battery pack is enhanced, the weight of the box cover is also favorably reduced, and fire-retardant plates such as mica plates do not need to be additionally arranged on the box cover.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle battery boxes, and in particular to a fireproof cover, a battery pack and a vehicle. Background Art

[0002] The battery pack usually uses the upper shell of the battery pack to block the spread of fire when the battery pack has a thermal runaway. For example, mica plates with heat insulation characteristics are used, and the mica plates are pasted on the inner side of the upper shell of the battery pack. However, due to the shape limitation of the upper shell, the mica plates cannot be pasted on the upper shell as a whole piece and need to be pasted in pieces, resulting in poor fire and heat resistance effects, and unable to effectively slow down or prevent the outward spread of the thermal runaway of the battery pack, resulting in low safety of the battery pack, and it is difficult to construct with mica plate products and cannot be shaped. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. For this reason, an embodiment of the utility model provides a fireproof cover with good conformability, improved fireproof performance, effective flame retardancy and heat resistance, avoiding the spread of thermal runaway inside the battery pack, enhancing the safety of the battery pack, and also being beneficial to reducing the weight of the cover.

[0004] An embodiment of the utility model provides a battery pack.

[0005] An embodiment of the utility model provides a vehicle.

[0006] A fireproof cover according to an embodiment of the utility model includes a first fiber layer, a metal plate, a fireproof film and a second fiber layer. The first fiber layer, the metal plate and the second fiber layer are arranged in sequence. The fireproof film is attached to the metal plate and is located between the metal plate and the second fiber layer. The first fiber layer, the metal plate, the fireproof film and the second fiber layer are an integral structure.

[0007] The fireproof cover according to an embodiment of the utility model includes a fireproof film inside it, which can improve the fireproof performance of the cover, effectively retard flame and heat, avoid the spread of thermal runaway inside the battery pack, enhance the safety of the battery pack, and also be beneficial to reducing the weight of the cover, without adding fireproof plates such as mica plates to the cover. While the fireproof cover according to an embodiment of the utility model realizes preventing thermal runaway, each of the first fiber layer, the metal plate, the fireproof film and the second fiber layer can be deformed, can be deformed according to the design requirements, has a high conformability, and is convenient for the processing and manufacturing of the cover. Moreover, the first fiber layer, the metal plate, the fireproof film and the second fiber layer are integrally formed, which can avoid subsequent secondary processing and improve the processing and manufacturing efficiency of the cover.

[0008] In some embodiments, a plurality of through holes are provided on the metal plate.

[0009] In some embodiments, the fireproof film is a silicone film.

[0010] In some embodiments, the metal plate is a steel plate.

[0011] In some embodiments, the thickness of the steel plate is 0.6 - 0.8 mm, and the thickness of the fireproof film is 0.8 - 1.2 mm.

[0012] In some embodiments, both the first fiber layer and the second fiber layer are prepregs.

[0013] In some embodiments, the fireproof box cover further includes a cooling layer. The cooling layer is provided on a side of the second fiber layer facing away from the metal plate. A plurality of columns of cooling channels are formed in the cooling layer, and adjacent two columns of the cooling channels are communicated with each other. The cooling channels are opposite to the battery modules in the battery pack, and the cooling channels at one end of the plurality of columns of cooling channels are used to connect to a liquid cooling system.

[0014] In some embodiments, at least a part of the cooling channels is serpentine.

[0015] The battery pack according to an embodiment of the present invention includes the fireproof box cover according to any one of the embodiments.

[0016] The battery pack according to an embodiment of the present invention has good fireproof performance, effectively prevents combustion and heat transfer, avoids the spread of thermal runaway, and has good safety.

[0017] The vehicle according to an embodiment of the present invention includes the battery pack. Description of the Drawings

[0018] Figure 1 is one of the structural schematic diagrams of the fireproof box cover according to an embodiment of the present invention;

[0019] Figure 2 is the structural schematic diagram of the metal plate according to an embodiment of the present invention;

[0020] Figure 3 is the other structural schematic diagram of the fireproof box cover according to an embodiment of the present invention;

[0021] Reference Signs:

[0022] Box cover 100, first fiber layer 1, metal plate 2, through hole 21, fireproof film 3, second fiber layer 4, cooling layer 5, cooling channel 51. Detailed Description of the Embodiments

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0024] The battery pack of the embodiment of the present utility model includes a fireproof box cover 100, a box body and a battery module. The box cover 100 is detachably connected to the box body, and the battery module is located inside the box body.

[0025] As Figures 1 to 3 shown, the fireproof box cover 100 of the present utility model includes a first fiber layer 1, a metal plate 2, a fireproof film 3 and a second fiber layer 4. The first fiber layer 1, the metal plate 2 and the second fiber layer 4 are arranged in sequence. The fireproof film 3 is attached to the metal plate 2 and is located between the metal plate 2 and the second fiber layer 4. The first fiber layer 1, the metal plate 2, the fireproof film 3 and the second fiber layer 4 are an integral structure.

[0026] The production process of the fireproof box cover 100 of the embodiment of the present utility model is as follows:

[0027] Step 1: Attach the fireproof film 3 to the metal plate 2, and then sequentially place the first fiber layer 1, the metal plate 2, and the second fiber layer 4 in a preforming mold for preforming the box cover 100 to form a preform.

[0028] Step 2: Sequentially place the preform of the first fiber layer 1, the preform of the metal plate 2, and the preform of the second fiber layer 4 in an injection mold, and then inject resin into the injection mold. The temperature of the injection mold is 70 - 180 °C, and the vacuum degree is not greater than -0.085 MPa.

[0029] Step 3: Heat the injection mold for 3 - 5 min, and then open the injection mold for demolding.

[0030] Step 4: Cut off the waste edges on the box cover 100 to complete the production process.

[0031] The fireproof box cover 100 of the embodiment of the present utility model includes a fireproof film 3 inside it, which can improve the fireproof performance of the box cover 100, effectively retard fire and heat, prevent the spread of thermal runaway inside the battery pack, enhance the safety of the battery pack, and also help reduce the weight of the box cover 100 without adding fireproof plates such as mica plates to the box cover 100. While the fireproof box cover 100 of the embodiment of the present utility model realizes preventing thermal runaway, each of the first fiber layer 1, the metal plate 2, the fireproof film 3 and the second fiber layer 4 can be deformed, can be deformed according to design requirements, has a high conformability, and is convenient for processing and manufacturing the box cover 100. Moreover, the first fiber layer 1, the metal plate 2, the fireproof film 3 and the second fiber layer 4 are integrally formed, which can avoid subsequent secondary processing and improve the processing and manufacturing efficiency of the box cover 100.

[0032] In the embodiment of the present utility model, the fireproof box cover 100 uses the first fiber layer 1 and the second fiber layer 4 as the outer plates of the fireproof box cover 100, covering the metal plate 2 and the fireproof film 3. The first fiber layer 1 and the second fiber layer 4 have the advantages of good corrosion resistance, high heat resistance, and high mechanical strength, and can ensure the mechanical properties of the fireproof box cover 100.

[0033] Therefore, the fireproof box cover 100 of the embodiment of the present utility model has good conformity, light weight, good fireproof, flame retardant and heat insulation properties, and can avoid the spread of thermal runaway in the battery pack.

[0034] In some embodiments, both the first fiber layer 1 and the second fiber layer 4 are fiber fabric layers. For example, fiber felt.

[0035] In some embodiments, a plurality of through holes 21 are provided on the metal plate 2. In step 2, when injecting resin, the resin can flow into the through holes 21, increasing the contact area between the resin and the metal plate 2, increasing the integration of the metal plate 2 and the first fiber layer 1 and the second fiber layer 4, and increasing the strength of the box cover 100.

[0036] In some embodiments, the metal plate 2 is a steel plate. The steel plate has high strength and low cost, which is beneficial to improving the strength of the box cover 100, reducing the manufacturing cost of the box cover 100, and reducing the manufacturing cost of the battery pack.

[0037] In some embodiments, the fireproof film 3 is an organic silicone film, which has high weather resistance and high fireproof grade characteristics, good fireproof and flame retardant effects, and has initial adhesion, which is convenient for attaching to the metal plate 2.

[0038] In some embodiments, the thickness of the steel plate is 0.6 - 0.8 mm, and the thickness of the fireproof film 3 is 0.8 - 1.2 mm. For example, the thickness of the steel plate is 0.6 mm, 0.7 mm or 0.8 mm, and the thickness of the fireproof film 3 is 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm or 1.2 mm.

[0039] In some embodiments, both the first fiber layer 1 and the second fiber layer 4 are prepregs. In the process of manufacturing the box cover 100, after step 1, the preforms of the first fiber layer 1 and the preforms of the second fiber layer 4 are impregnated with resin, then heated and pre-cured, and then step 2 is carried out to mold the preform of the first fiber layer 1, the preform of the metal plate 2 with the organic silicone film attached, and the preforms of the second fiber layer 4 into an integral structure. The prepreg is made by impregnating a continuous fiber fabric with a resin matrix under strictly controlled conditions, making the combined strength of the resin matrix and the first fiber layer 1 and the second fiber layer 4 and the metal plate 2 with the organic silicone film attached, that is, improving the strength of the fireproof box cover 100.

[0040] In some embodiments, the fireproof box cover 100 further includes a cooling layer 5. The cooling layer 5 is provided on the side of the second fiber layer 4 away from the metal plate 2, and the cooling layer 5 is located on the side of the box cover 100 adjacent to the battery module in the battery pack. A plurality of columns of cooling channels 51 are formed in the cooling layer 5. Two adjacent columns of cooling channels 51 are communicated with each other. The cooling channels 51 face the battery module in the battery pack, and the cooling channels 51 at one end of the plurality of columns of cooling channels 51 are connected to a liquid cooling system. The coolant flowing in the cooling channels 51 can exchange heat with the heat in the battery pack, cool down the inside of the battery pack, reduce the possibility of thermal runaway, and improve the safety of the battery pack.

[0041] In some embodiments, at least a part of the cooling channels 51 is serpentine. The serpentine cooling channels 51 have a longer length, which can increase the surface area of the cooling channels 51, increase the heat exchange area between the coolant and the heat in the battery pack, thereby improving the heat exchange effect, further cooling down the inside of the battery pack, further reducing the possibility of thermal runaway, and further improving the safety of the battery pack.

[0042] The vehicle according to the embodiment of the present utility model includes a battery pack.

[0043] Thus, the battery pack of the vehicle according to the embodiment of the present utility model has good safety.

[0044] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0048] In the present utility model, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0049] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A fireproof box cover (100), characterized in that: The invention comprises a first fiber layer (1), a metal plate (2), a fireproof film (3) and a second fiber layer (4); the first fiber layer (1), the metal plate (2) and the second fiber layer (4) are arranged in sequence; the fireproof film (3) is attached to the metal plate (2) and is located between the metal plate (2) and the second fiber layer (4); the first fiber layer (1), the metal plate (2), the fireproof film (3) and the second fiber layer (4) are an integrated structure.

2. The fireproof box cover (100) according to claim 1, characterized in that: The metal plate (2) is provided with a plurality of through holes.

3. The fireproof box cover (100) according to claim 1, characterized in that: The fireproof film (3) is an organic silica gel film.

4. The fireproof box cover (100) according to claim 1, characterized in that: The metal plate (2) is a steel plate.

5. The fireproof box cover (100) according to claim 4, characterized in that: The thickness of the steel plate is 0.6-0.8 mm, and the thickness of the fireproof film (3) is 0.8-1.2 mm.

6. The fireproof box cover (100) according to claim 1, characterized in that: The first fiber layer (1) and the second fiber layer (4) are both prepregs.

7. The fireproof box cover (100) according to claim 1, characterized in that: The invention further comprises a cooling layer (5), wherein the cooling layer (5) is arranged on the side of the second fiber layer (4) away from the metal plate (2), and a plurality of cooling channels (51) are provided on the cooling layer (5), and two adjacent columns of the cooling channels (51) are connected, and the cooling channels (51) are used to be opposite to the battery modules in the battery pack, and the cooling channels (51) located at one end of the plurality of cooling channels (51) are used to connect to the liquid cooling system.

8. The fireproof box cover (100) according to claim 7, characterized in that: At least a portion of the cooling channel (51) is serpentine.

9. A battery pack, characterized in that: The invention comprises the fireproof box cover (100) according to any one of claims 1 to 8.

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

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