Upper cover of battery box

Abstract

The utility model discloses an upper cover of a battery box. The upper cover comprises a plurality of long glass fiber epoxy resin layers and a mica plate, the long glass fiber epoxy resin layers are sequentially arranged in the thickness direction, the mica plates are arranged between every two adjacent long glass fiber epoxy resin layers, and the long glass fiber epoxy resin layers and the mica plates are stamped into an integrated piece through a mold pressing process. According to the battery box upper cover, the mica plate is directly integrated between the two long glass fiber epoxy resin layers in the process of compression molding of the long glass fiber epoxy resin layers, and the process of connecting the mica plate with the long glass fiber epoxy resin layers is not needed. Only through integral direct compression molding, a molded part is a final finished product, so that the material and labor cost is greatly reduced, and the production time can also be greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of battery boxes, in particular to a battery box upper cover. Background Art

[0002] The existing commercial vehicle battery box uses composite materials or metal materials to make the upper cover through molding. As the requirements for the thermal runaway resistance of power batteries are gradually increasing, simple composite materials or metal upper covers are difficult to meet the performance requirements of thermal runaway resistance. Therefore, the existing technology uses the method of sticking mica boards on the inner top of the formed upper cover parts to improve the fire resistance and thermal shock resistance. However, in order to ensure the firmness and durability of the mica board, this technology often requires the use of a large area of ​​double-sided adhesive to meet the requirements of firmly sticking the mica board, and has high requirements for the environment and proficiency of the sticking operation. Overall, it is costly and difficult to operate.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The utility model provides a battery box upper cover.

[0005] The utility model adopts the following technical solutions:

[0006] The present application provides a battery box upper cover, comprising:

[0007] A plurality of long glass fiber epoxy resin layers, each of the long glass fiber epoxy resin layers is arranged in sequence along the thickness direction;

[0008] A mica board, wherein the mica board is arranged between two adjacent long glass fiber epoxy resin layers;

[0009] Each of the long glass fiber epoxy resin layers and the mica board is stamped into an integral part through a molding process.

[0010] Optionally, it comprises at least three long glass fiber epoxy resin layers, and each of the long glass fiber epoxy resin layers is arranged in sequence along the thickness direction;

[0011] The mica board is arranged between at least the two lowermost long glass fiber epoxy resin layers.

[0012] Optionally, the battery box upper cover comprises at least three long glass fiber epoxy resin layers, and each of the long glass fiber epoxy resin layers is arranged in sequence along the thickness direction;

[0013] The mica board is arranged between every two adjacent long glass fiber epoxy resin layers.

[0014] Optionally, each of the long glass fiber epoxy resin layers includes a main sheet body and a side sheet body arranged at the edge of the main sheet body;

[0015] The mica board is at least arranged between the main sheets of two adjacent long glass fiber epoxy resin layers.

[0016] Optionally, the mica board is located in the middle of the main sheet body, and the area of ​​the mica board is smaller than the area of ​​the main sheet body;

[0017] The length of the mica plate is 2 cm to 4 cm shorter than the length of the main sheet;

[0018] The width of the mica plate is 2 cm to 4 cm smaller than the width of the main plate body.

[0019] Optionally, the mica board between the main sheets between the adjacent long glass fiber epoxy resin layers includes a plurality of sub-sheets, each sub-sheet is located in the same plane, and each sub-sheet is staggered.

[0020] Optionally, the mica board includes a main board and a side board;

[0021] The main board is arranged between main sheet bodies of adjacent long glass fiber epoxy resin layers, and the side board is arranged between side sheet bodies of adjacent long glass fiber epoxy resin layers.

[0022] Optionally, the main board and the side board are connected;

[0023] Alternatively, the main board and the side boards are independent structural members.

[0024] Optionally, the long glass fiber epoxy resin layer is formed into a concave and convex profile by stamping.

[0025] Optionally, a plurality of connection holes are provided at the edge of the integral piece formed by each of the long glass fiber epoxy resin layers.

[0026] By adopting the above technical solution, the utility model has the following beneficial effects:

[0027] The battery box cover provided by the present application directly integrates the mica board between the two long glass fiber epoxy resin layers in the process of compression molding of the long glass fiber epoxy resin layer, and there is no need to connect the mica board to the long glass fiber epoxy resin layer. The whole body only needs to be directly molded, and the molded part is the final product, which greatly reduces material and labor costs and can also greatly shorten production time.

[0028] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are part of this application and are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0030] Figure 1 A schematic diagram of an exploded structure in which only the main sheet of the battery box upper cover provided in the first embodiment of the present application is provided with a mica board is shown;

[0031] Figure 2 A schematic diagram of the exploded structure of the mica board of the battery box upper cover provided in the first embodiment of the present application, including a main board and a side board, is shown;

[0032] Figure 3 It shows a schematic structural diagram of a battery box in a first direction provided by the second embodiment of the present application;

[0033] Figure 4 A schematic structural diagram of the battery box in the second direction provided in the second embodiment of the present application is shown.

[0034] In the figure: long glass fiber epoxy resin layer 1, main sheet body 11, side sheet body 12, mica board 2, main board 21, side plate 22, concave and convex pressing 3, connecting hole 4, battery box upper cover 100, bottom plate 200, end plate 300.

[0035] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] See also Figure 1 to Figure 2 As shown, an embodiment of the present application provides a battery box cover, including a plurality of long glass fiber epoxy resin layers 1 and a mica board 2. Each of the long glass fiber epoxy resin layers 1 is arranged in sequence along the thickness direction, and the mica board 2 is arranged between two adjacent long glass fiber epoxy resin layers 1, and each of the long glass fiber epoxy resin layers 1 and the mica board 2 are stamped into an integral part through a molding process. In the battery box cover of the present application, the mica board 2 is directly integrated between the two long glass fiber epoxy resin layers 1 in the process of molding the long glass fiber epoxy resin layer 1, and there is no need to connect the mica board 2 to the long glass fiber epoxy resin layer 1. The whole body only needs to be directly molded, and the molded part is both the final finished product, which greatly reduces material and labor costs, and can also greatly shorten the production time.

[0041] Among them, the long glass fiber epoxy resin layer 1 is formed by molding the long glass fiber epoxy resin prepreg in the stamping molding process with the mica board 2. Glass fiber epoxy resin has a small specific gravity and high specific strength. The specific gravity is 1.6-2.0, which is lighter than the lightest metal aluminum, and the specific strength is higher than that of high-grade alloy steel. The corrosion resistance of glass fiber epoxy resin is the most outstanding among glass fiber reinforced thermosetting plastics (GFRP). It is very stable in media such as acid, alkali, organic solvents, and seawater, and its corrosion resistance exceeds that of stainless steel. It is also a good electrical insulation material. Its resistivity and breakdown voltage strength have reached the standards of electrical insulation materials. It is also not affected by electromagnetic effects, does not reflect electromagnetic waves, and has good microwave transmittance. In addition, it also has the properties of heat preservation, heat insulation, sound insulation, vibration reduction, etc. In addition, the curing shrinkage rate of glass fiber epoxy resin is low, which is beneficial to the production process, can be cured at low pressure, has very low volatile matter, and has good mechanical properties and chemical resistance after curing, and good electrical insulation properties.

[0042] The mica board 2 has excellent high temperature resistant insulation performance, with a maximum temperature resistance of up to 1000°C, and has a good cost performance ratio among high temperature resistant insulation materials. The mica board 2 also has excellent electrical insulation performance, and the voltage breakdown index of ordinary mica board 2 is as high as 20KV / mm. The mica board 2 is made of mica paper and organic silica gel water by heating and pressing, and has thermoplastic properties and can be molded with long glass fiber epoxy resin prepreg instrument.

[0043] During the lamination process before molding, the mica board 2 is laid on the prepreg layer and added between the layer 1 and the layer 2 to form a sandwich composite layer. A layer of prepreg is then laid on the upper layer of the sandwich composite layer to form a pretreatment assembly, which is then formed as a whole through a molding process.

[0044] In some possible implementations, the battery box upper cover 100 includes at least three long glass fiber epoxy resin layers 1, each of which is arranged in sequence along the thickness direction. Arranging at least three layers of long glass fiber epoxy resin layers 1 can superimpose the beneficial effects of the long glass fiber epoxy resin layers 1. The mica board 2 is arranged between at least the two lowest long glass fiber epoxy resin layers 1, wherein the lower side refers to the side of the upper cover close to the battery cell after the battery cell is installed in the battery box, and the mica board 2 is arranged on the side closer to the battery cell, which can better play the role of fire resistance and heat shock resistance in the case of thermal runaway of the battery cell, so that the thermal runaway resistance performance of the battery box upper cover 100 is better.

[0045] In some possible implementations, the battery box cover 100 includes at least three long glass fiber epoxy resin layers 1, and each of the long glass fiber epoxy resin layers 1 is arranged in sequence along the thickness direction. The mica board 2 is arranged between each two adjacent long glass fiber epoxy resin layers 1. Providing at least three layers of long glass fiber epoxy resin layers 1 can superimpose the beneficial effects of the long glass fiber epoxy resin layers 1. The mica board 2 is arranged between any two layers of long glass fiber epoxy resin layers 1 for molding to ensure that the battery box cover 100 has a stable structure.

[0046] In some possible implementations, each of the long glass fiber epoxy resin layers 1 includes a main sheet 11 and a side sheet 12 disposed at the edge of the main sheet 11, and the mica board 2 is disposed at least between the main sheets 11 of two adjacent long glass fiber epoxy resin layers 1. The battery pack in the battery box has a pressure relief valve, which is located on the end face of the battery pack close to the main sheet 11. When the battery cell has thermal runaway, fire will be emitted from the pressure relief valve. Therefore, arranging the mica board 2 at the main sheet 11 position has the best effect on improving the fire resistance of the battery box, and is also the most necessary.

[0047] In some possible implementation schemes, the mica board 2 is located in the middle of the main sheet 11, and the area of ​​the mica board 2 is smaller than the area of ​​the main sheet 11. The length of the mica board 2 is 2cm to 4cm smaller than the length of the main sheet 11, and the width of the mica board 2 is 2cm to 4cm smaller than the width of the main sheet 11. The mica board 2 must be coated in two layers of long glass fiber epoxy resin layers 1 to ensure that the overall structure of the entire battery box cover 100 is stable and there will be no faults or layer peeling. Therefore, the area of ​​the mica board 2 is smaller than the area of ​​the main sheet 11, and the mica board 2 is located in the middle of the main sheet 11. The two layers of long glass fiber epoxy resin layers 1 located above and below the mica board 2 can be stably connected together during the molding process. After the battery box cover 100 is molded, the distance between each edge of the mica board 2 and the edge of the adjacent main sheet 11 is 1cm to 2cm.

[0048] Preferably, the length of the mica board 2 is 3 cm smaller than the length of the main sheet 11, and the width of the mica board 2 is 3 cm smaller than the width of the main sheet 11. When the battery box upper cover 100 is molded, the distance between each edge of the mica board 2 and the edge of the adjacent main sheet 11 is 1.3 cm.

[0049] In some possible implementations, the mica board 2 between the main sheets 11 between the adjacent long glass fiber epoxy resin layers 1 includes a plurality of sub-sheets, each of which is located in the same plane and is staggered. The mica sheet can be a whole sheet or a plurality of sub-sheets staggered. If the plurality of sub-sheets are staggered and the adjacent sub-sheets are overlapped at the staggered positions, the plurality of sub-sheets can be pressed into a whole during the molding process. In this way, some large pieces of mica sheet scraps can also be used, saving costs.

[0050] In some possible implementations, the mica board 2 includes a main board 21 and a side board 22. The main board 21 is disposed between the main sheets 11 of adjacent long glass fiber epoxy resin layers 1, and the side board 22 is disposed between the side sheets 12 of adjacent long glass fiber epoxy resin layers 1. The mica board 2 is disposed between the main sheets 11 and the side sheets 12, which comprehensively improves the fire resistance and thermal shock resistance, so that the upper cover is improved to the optimal fireproof effect.

[0051] In some possible implementation schemes, the main board 21 and the side panel 22 may have two initial states. The first state is that the main board 21 and the side panel 22 are connected. Compared with the second setting mode, this setting mode has no gap between the main board 21 and the side panel 22, and the fire prevention effect is better. The second state is that the main board 21 and the side panel 22 are independent structural parts. Compared with the first setting mode, this setting mode is more convenient for the operation of the molding process of the battery box cover 100, and the production cost can be greatly reduced. The above two setting modes can be selected according to the specific conditions such as the production process, production equipment, the use environment of the battery box, and the specific structure of the battery box.

[0052] In some possible implementations, the long glass fiber epoxy resin layer 1 is punched to form a concave-convex profile 3. The setting of the concave-convex profile 3 can increase the overall structural strength of the battery box upper cover 100 and reduce the resonance of the battery box.

[0053] In some possible embodiments, the edge of the integral piece formed by each of the long glass fiber epoxy resin layers 1 is provided with a plurality of connection holes 4. The connection holes 4 are used to connect the battery box cover 100 with the bottom plate 200 and the end plate 300 of the battery box, and the connector passes through the connection holes 4 to connect with the bottom plate 200 or the end plate 300.

[0054] Embodiment 2

[0055] See also Figures 1 to 4 As shown, an embodiment of the present application provides a battery box, which includes a bottom plate 200, the battery box upper cover 100 described in Embodiment 1, and two end plates 300. The upper cover is connected to the bottom plate 200, and a port is formed between the upper cover and the bottom plate 200. The two end plates 300 are both connected to the bottom plate 200 and the upper cover, and the two end plates 300 cover the corresponding ports respectively. The battery box of this embodiment uses the battery box upper cover 100 of Embodiment 1, which greatly shortens the production time of the overall battery box, and also reduces the use of materials and labor costs.

[0056] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A battery box cover, characterized in that: include: A plurality of long glass fiber epoxy resin layers, each of the long glass fiber epoxy resin layers is arranged in sequence along the thickness direction; A mica board, wherein the mica board is arranged between two adjacent long glass fiber epoxy resin layers; Each of the long glass fiber epoxy resin layers and the mica board is stamped into an integral part through a molding process.

2. The battery box upper cover according to claim 1, characterized in that: It comprises at least three long glass fiber epoxy resin layers, each of which is arranged in sequence along the thickness direction; The mica board is arranged between at least the two lowermost long glass fiber epoxy resin layers.

3. The battery box upper cover according to claim 1, characterized in that: It comprises at least three long glass fiber epoxy resin layers, each of which is arranged in sequence along the thickness direction; The mica board is arranged between every two adjacent long glass fiber epoxy resin layers.

4. The battery box upper cover according to claim 1, characterized in that: Each of the long glass fiber epoxy resin layers comprises a main sheet body and a side sheet body arranged at the edge of the main sheet body; The mica board is at least arranged between the main sheets of two adjacent long glass fiber epoxy resin layers.

5. The battery box upper cover according to claim 4, characterized in that: The mica board is located in the middle of the main sheet, and the area of ​​the mica board is smaller than the area of ​​the main sheet; The length of the mica plate is 2 cm to 4 cm shorter than the length of the main sheet; The width of the mica plate is 2 cm to 4 cm smaller than the width of the main plate body.

6. The battery box upper cover according to claim 4, characterized in that: The mica board between the main sheets between the adjacent long glass fiber epoxy resin layers comprises a plurality of sub-sheets, each sub-sheet is located in the same plane and each sub-sheet is staggered.

7. The battery box upper cover according to claim 4, characterized in that: The mica board includes a main board and a side board; The main board is arranged between main sheet bodies of adjacent long glass fiber epoxy resin layers, and the side board is arranged between side sheet bodies of adjacent long glass fiber epoxy resin layers.

8. The battery box upper cover according to claim 7, characterized in that: The main board is connected to the side board; Alternatively, the main board and the side boards are independent structural members.

9. The battery box upper cover according to any one of claims 1 to 8, characterized in that: The long glass fiber epoxy resin layer is formed into a concave and convex profile by punching.

10. The battery box upper cover according to any one of claims 1 to 8, characterized in that: The edge of each integral piece formed by the long glass fiber epoxy resin layer is provided with a plurality of connection holes.

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