Battery bottom protection plate

Abstract

The utility model provides a battery bottom protection plate. The battery bottom protection plate comprises an upper continuous fiber reinforced thermoplastic composite material, an upper thermoplastic adhesive film, a metal plate, a thermoplastic resin frame, a lower thermoplastic adhesive film and a lower continuous fiber reinforced thermoplastic composite material which are fixed and integrally connected through hot pressing. According to the battery bottom protection plate provided by the embodiment of the utility model, the six surfaces of the metal plate are wrapped by the thermoplastic resin layers, particularly, the upper thermoplastic adhesive film and the lower thermoplastic adhesive film are additionally arranged on the upper surface and the lower surface of the metal plate respectively, and the thermoplastic resin frame is additionally arranged on the periphery of the metal plate; compared with a traditional structure, the protection of the resin layer on the metal plate is added, the overall air tightness of the battery bottom protection plate and the corrosion resistance of the metal plate are improved, and the water vapor barrier property of the battery bottom protection plate is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery bottom guard plate technical field, specifically, relate to a battery bottom guard plate. BACKGROUND

[0002] The sealing of new energy automobile battery pack directly influences the safety of the whole vehicle. Therefore, the development and application of the battery bottom guard plate with high air tightness is very important.

[0003] The existing battery bottom guard plate structure is that the fiber reinforced resin composite directly covers the metal plate. Because the fiber and the resin have a certain porosity, and the fiber has a siphon effect on the water in the external environment, the water in the external environment is introduced into the inside of the bottom guard plate, causing the corrosion of the metal plate, resulting in the delamination of the bottom guard plate, and further causing the poor sealing of the battery bottom guard plate, and affecting the overall heat preservation of the battery pack. UTILITY MODEL CONTENT

[0004] To solve the above problems, the purpose of the embodiment of the utility model is to provide a battery bottom guard plate method and device.

[0005] In the first aspect, the utility model provides a battery bottom guard plate which is integrally connected by heat pressing and fixing an upper continuous fiber reinforced thermoplastic composite, an upper thermoplastic adhesive film, a metal plate, a thermoplastic resin frame, a lower thermoplastic adhesive film and a lower continuous fiber reinforced thermoplastic composite.

[0006] Optionally, the upper continuous fiber reinforced thermoplastic composite and the lower continuous fiber reinforced thermoplastic composite each comprise a plurality of layers of cross-laminated unidirectional composite material strips.

[0007] Optionally, the unidirectional composite material strip is a thermoplastic resin impregnated continuous fiber.

[0008] Optionally, the upper thermoplastic adhesive film and the lower thermoplastic adhesive film are one or more films of modified polypropylene, modified polyethylene, modified ethylene-vinyl acetate copolymer, modified polyamide, modified ethylene-vinyl alcohol copolymer and modified polyurethane, and the modified way is maleic anhydride grafting or glycidyl methacrylate grafting; the size of the upper thermoplastic adhesive film and the lower thermoplastic adhesive film is greater than the size of the metal plate (3) and less than or equal to the size of the upper continuous fiber reinforced thermoplastic composite and the lower continuous fiber reinforced thermoplastic composite.

[0009] Optionally, the ratio of the thickness of the thermoplastic resin frame (4) to the thickness of the metal plate (3) is 0.8-1.2.

[0010] Optionally, the material of the thermoplastic resin frame comprises polypropylene, polyethylene, polyamide, polycarbonate, polymethyl methacrylate or modified materials of the above materials.

[0011] Optionally, the thickness of the metal plate is 0.5-2mm; the metal plate is a steel plate, and the outer surface of the steel plate is provided with a zinc plating layer, a zinc-iron alloy plating layer or an electrophoretic paint protective layer.

[0012] Optionally, the non-metal plate area of the battery bottom guard plate has a mounting hole for accommodating a steel bushing and a screw.

[0013] Optionally, the opening spacing of the mounting hole is 20-150mm, and the hole edge of the mounting hole is 2-40mm away from the edge of the battery bottom guard plate.

[0014] Optionally, the steel bushing 7 protrudes the screw mounting surface of the battery bottom guard plate by 0.05-0.55mm.

[0015] Optionally, the battery bottom guard plate further comprises a foamed silica gel sealing gasket bonded to the mounting surface of the battery bottom guard plate.

[0016] In the scheme provided in the above embodiment of the utility model, the six surfaces of the metal plate are all wrapped by the thermoplastic resin layer, especially, the upper thermoplastic adhesive film and the lower thermoplastic adhesive film are additionally arranged on the upper surface and the lower surface of the metal plate, compared with the traditional structure, the protection of the resin layer to the metal plate is increased, the overall air tightness of the battery bottom guard plate and the corrosion resistance of the metal plate are improved, and the water vapor barrier property of the battery bottom guard plate is also better.

[0017] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Figure 1 The structure schematic diagram of the battery bottom guard plate provided by the embodiment of the utility model is shown;

[0020] Figure 2 The connection specific structure schematic diagram of the battery bottom guard plate provided by the embodiment of the utility model is shown.

[0021] Icon:

[0022] 1-Upper continuous fiber reinforced thermoplastic composite, 2-Upper thermoplastic film, 3-Metal plate, 4-Thermoplastic resin frame, 5-Lower thermoplastic film, 6-Lower continuous fiber reinforced thermoplastic composite, 7-Steel bushing, 8-Screw, 9-Foamed silica gel sealing pad, 10-Battery bottom guard plate. DETAILED DESCRIPTION

[0023] In the description of the present application, 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" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0025] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The embodiment of the present application provides a battery bottom guard plate for being installed in a new energy automobile. Figure 1As shown, the battery bottom guard plate at least includes: upper continuous fiber reinforced thermoplastic composite 1, upper thermoplastic adhesive film 2, metal plate 3, thermoplastic resin frame 4, lower thermoplastic adhesive film 5 and lower continuous fiber reinforced thermoplastic composite 6. The six layers of materials are fixedly connected to form an integral structure, and specifically, the six layers of materials can be fixed as an integral structure by means of hot pressing and cooling. For example, the layers of materials can be laid from bottom to top in the order of lower continuous fiber reinforced thermoplastic composite 6, lower thermoplastic adhesive film 5, thermoplastic resin frame 4, metal plate 3, upper thermoplastic adhesive film 2 and upper continuous fiber reinforced thermoplastic composite 1, and the whole is placed into a continuous Teflon compound machine for hot pressing, and then cooled and drawn out by a traction roller to form a composite plate, and finally cut to form the required battery bottom guard plate. The heating temperature can be 230 DEG C, the cooling temperature can be 5-10 DEG C, the height of the battery bottom guard plate can be set to 2.6 mm, and the speed is 1.5 m / min.

[0027] The battery bottom guard plate provided by the utility model, the six surfaces of the metal plate 3 are all wrapped by the thermoplastic resin layer, and in particular, the upper thermoplastic adhesive film 2 and the lower thermoplastic adhesive film 5 are additionally arranged on the upper surface and the lower surface of the metal plate 3, so that the protection of the resin layer on the metal plate 3 is increased compared with the traditional structure, the overall air tightness of the battery bottom guard plate and the corrosion resistance of the metal plate 3 are improved, and the water vapor barrier property of the battery bottom guard plate is better.

[0028] Optionally, the upper continuous fiber reinforced thermoplastic composite 1 and the lower continuous fiber reinforced thermoplastic composite 6 both comprise a plurality of layers of cross-laminated unidirectional composite material strips.

[0029] The unidirectional composite material strip is a UD (uni-directional) strip, and as the name implies, it is a material strip formed by arranging all reinforcing phase fibers in the same direction. In the embodiment of the utility model, the upper continuous fiber reinforced thermoplastic composite 1 and the lower continuous fiber reinforced thermoplastic composite 6 located at the top layer and the bottom layer respectively are both laminated by a plurality of layers of UD strips. Specifically, the plurality of layers of UD strips are cross-laminated and overlapped on the horizontal surface at an angle of 0 DEG or 90 DEG to form the upper continuous fiber reinforced thermoplastic composite 1 or the lower continuous fiber reinforced thermoplastic composite 6.

[0030] Optionally, the unidirectional composite material strip (UD strip) is a thermoplastic resin impregnated continuous fiber, that is, the unidirectional composite material strip is made of a thermoplastic resin impregnated continuous fiber.

[0031] Optionally, the upper thermoplastic film 2 and the lower thermoplastic film 5 are one or more films selected from modified polypropylene, modified polyethylene, modified ethylene-vinyl acetate copolymer, modified polyamide, modified ethylene-vinyl alcohol copolymer, and modified polyurethane, wherein the modification is performed by maleic anhydride grafting or glycidyl methacrylate grafting. For example, the upper thermoplastic film 2 and the lower thermoplastic film 5 can be maleic anhydride-grafted polyolefin films with a thickness of 0.05 to 0.3 mm. Furthermore, the dimensions of the upper thermoplastic film 2 and the lower thermoplastic film 5 are larger than the dimensions of the metal plate 3, and smaller than or equal to the dimensions of the upper continuous fiber reinforced thermoplastic composite 1 and the lower continuous fiber reinforced thermoplastic composite 6.

[0032] Optionally, the thermoplastic resin frame 4 is used to surround the metal plate 3, and the ratio of the thickness of the thermoplastic resin frame 4 to the thickness of the metal plate 3 is 0.8 to 1.2. It is understood that the thermoplastic resin frame 4 does not contain fibers and is a thermoplastic resin extruded sheet. Compared with fiber-reinforced thermoplastic resin materials, thermoplastic resin has better water vapor barrier properties. Further, the material of the thermoplastic resin frame 4 may include: polypropylene, polyethylene, polyamide, polycarbonate, polymethyl methacrylate, or modified materials of the above. Preferably, the material of the thermoplastic resin frame 4 is polypropylene.

[0033] Optionally, the thickness of the metal plate 3 is 0.5 to 2 mm; the metal plate 3 may include a steel plate, an aluminum plate, or a copper plate. In this embodiment of the present invention, when the metal plate 3 is a steel plate, a zinc plating layer can be plated on the surface of the steel plate, that is, the metal plate 3 is a galvanized steel plate, wherein the amount of zinc plating layer on the surface of the steel plate is 40 to 160 g / m².

[0034] In existing technology, the battery underbody protection plate has holes directly drilled in the non-metallic area, and is directly connected to the vehicle chassis under a certain locking torque. However, since the battery pack is at the bottom of the vehicle, this connection method is not airtight enough, which can cause mud and sand to enter the battery pack. Over time, a large amount of mud and sand will accumulate inside the battery underbody protection plate, reducing the ground clearance of the battery underbody protection plate and increasing the risk of the battery underbody protection plate being scratched.

[0035] To solve this problem, the present invention relates to a battery bottom protective plate ( Figure 2 The non-metallic plate area (represented by reference numeral 10 in the attached drawing) has mounting holes, such as... Figure 2 As shown, the battery underbody plate is bolted to the vehicle chassis by accommodating the steel bushing 7 and screws 8 through mounting holes. This avoids directly connecting the battery underbody plate to the vehicle chassis using tightening torque, further improving the airtightness of the connection, preventing mud and sand from entering the battery pack, better maintaining the ground clearance of the battery underbody plate, reducing the risk of scratches, and making the overall system lighter. Specifically, the steel bushing 7 can be a C-shaped steel bushing, with a nickel-plated surface and a plating thickness of 10–20 μm.

[0036] Optionally, the opening distance of the mounting hole can be 20-150mm, and the distance between the hole edge of the mounting hole and the edge of the battery bottom guard plate can be 2-40mm.

[0037] Optionally, the steel bushing 7 protrudes the screw mounting surface of the battery bottom guard plate by 0.05-0.55mm. It can be understood that the steel bushing 7 protrudes the upper surface of the battery bottom guard plate 10 (i.e. the upper surface of the upper continuous fiber reinforced thermoplastic composite 1) by 0.05-0.55mm, which can meet the installation torque requirement (5.5 newton force per meter) of the screw 8, and avoid cracks on the surface of the battery bottom guard plate 10 during installation.

[0038] Optionally, as shown in Figure 2 Optionally, the battery bottom guard plate further comprises: a foamed silica gel sealing pad 9 bonded to the mounting surface of the battery bottom guard plate. It can be understood that the mounting surface of the battery bottom guard plate is the lower surface of the battery bottom guard plate 10 (i.e. the lower surface of the lower continuous fiber reinforced thermoplastic composite 6). The thickness of the foamed silica gel sealing pad 9 can be 2-5mm, the density can be 0.5-1.5kg / m3, and the hardness can be 25-35HA.

[0039] The battery bottom guard plate and the box assembly gap of the embodiment of the utility model are sealed by foamed silica gel, the hole position of the surrounding non-metal plate region is reasonable, the high barrier battery bottom guard plate and the foamed silica gel sealing pad 9 can be closely attached, and the air tightness can meet the IP67 level requirement. Further, the good sealing property of the battery bottom guard plate also improves the overall heat preservation property of the battery pack, reduces the condensate condensation of the liquid cooling plate, and further ensures the sealing and waterproof, and prevents short circuit accidents caused by water ingress.

[0040] The utility model will be further illustrated by specific examples, the following embodiments are the preferred implementation of the present application, but the implementation of the present application is not limited by the following examples.

[0041] Example one:

[0042] The thickness of the upper continuous fiber reinforced thermoplastic composite 1 is 0.8mm; the thickness of the upper thermoplastic adhesive film 2 is 0.1mm; the thickness of the metal plate 3 is 0.7mm; the thickness of the thermoplastic resin frame 4 is 0.7mm; the thickness of the lower thermoplastic adhesive film 5 is 0.1mm; and the thickness of the lower continuous fiber reinforced thermoplastic composite 6 is 1mm.

[0043] The laid various materials are put into the continuous iron fluorine dragon compound machine for hot pressing, then cooled, and finally cut. The heating temperature is 230 DEG C, the cooling temperature is 5 DEG C, the height is set to 2.6mm, and the speed is 1.5m / min. After cooling, the composite plate is drawn out through the traction roller, and then cut to the required size.

[0044] Example two:

[0045] From top to bottom in turn includes: the thickness of 0.8mm upper continuous fiber reinforced thermoplastic composite 1, the thickness of 0.1mm upper thermoplastic adhesive film 2, the thickness of 1mm metal plate 3, the thickness of 1mm thermoplastic resin frame 4, the thickness of 0.1mm lower thermoplastic adhesive film 5, the thickness of 1mm lower continuous fiber reinforced thermoplastic composite 6.

[0046] The above laid various materials are put into a continuous iron fluorine compound machine and hot-pressed, then cooled, and finally cut, the heating temperature is 230 DEG C, the cooling temperature is 5 DEG C, the height is set to 2.8mm, and the speed is 1.5m / min. After cooling, the composite board is drawn out through the traction roller, and then cut to the required size.

[0047] Example three:

[0048] As Figure 2 The battery bottom guard plate includes: a model M5x16 internal hexagonal disc head screw 8, a C-shaped steel bushing 7 with an outer diameter of 10±0.1mm, an inner diameter of 7+0.2 / 0mm, and a height of 2.8±0.05mm, a battery bottom guard plate 10 with a thickness of 2.6mm, and a foamed silica gel sealing gasket 9 with a thickness of 2.5mm.

[0049] A numerical control (CNC, Computer Numerical Control) engraving machine is used to engrave a mounting hole with a diameter of 10mm in the non-metal area of the 2.6mm high-barrier battery bottom guard plate 10, the position of the mounting hole is reasonably arranged, the hole spacing is 85mm, and the hole edge is 2.5mm away from the outer contour edge of the battery bottom guard plate 10. The C-shaped steel bushing 7 is pressed into the hole of the high-barrier battery bottom guard plate 10 by using a special tool, one side of the steel bushing 7 protrudes from the high-barrier battery bottom guard plate 10 and is flush with the mounting surface of the high-barrier battery bottom guard plate 10 and the foamed silica gel sealing gasket 9. The back glue of the foamed silica gel sealing gasket 9 is torn open and adhered to the mounting surface of the battery bottom guard plate 10. The M5x16 internal hexagonal disc head screw 8 is used to tightly connect the battery bottom guard plate 10 and the foamed silica gel gasket 9, and the locking torque is 5.5N.m.

[0050] The above only describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacement technical solutions within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery undertray characterized by, It comprises: The upper continuous fiber reinforced thermoplastic composite (1), the upper thermoplastic adhesive film (2), the metal plate (3), the thermoplastic resin frame (4), the lower thermoplastic adhesive film (5) and the lower continuous fiber reinforced thermoplastic composite (6) are fixed and connected integrally by hot pressing; The material of the thermoplastic resin frame (4) comprises polypropylene, polyethylene, polyamide, polycarbonate, polymethyl methacrylate or modified materials of the above materials, and the thermoplastic resin frame (4) is a thermoplastic resin extruded plate.

2. The battery under-shield of claim 1, wherein, The upper continuous fiber reinforced thermoplastic composite (1) and the lower continuous fiber reinforced thermoplastic composite (6) each comprise a plurality of layers of cross-laminated unidirectional prepreg tapes.

3. The battery undertray of claim 2, wherein, The unidirectional prepreg tape is a thermoplastic resin impregnated continuous fiber.

4. The battery under-shield of claim 1, wherein, The upper thermoplastic adhesive film (2) and the lower thermoplastic adhesive film (5) are one or more films of modified polypropylene, modified polyethylene, modified ethylene-vinyl acetate copolymer, modified polyamide, modified ethylene-vinyl alcohol copolymer, and modified polyurethane, and the modification is maleic anhydride grafting or glycidyl methacrylate grafting; the size of the upper thermoplastic adhesive film (2) and the lower thermoplastic adhesive film (5) is greater than or equal to the size of the metal plate (3) and less than or equal to the size of the upper continuous fiber reinforced thermoplastic composite (1) and the lower continuous fiber reinforced thermoplastic composite (6).

5. The battery undertray of claim 1, wherein, The ratio of the thickness of the thermoplastic resin frame (4) to the thickness of the metal plate (3) is 0.8-1.

2.

6. The battery undertray of claim 1, wherein, The thickness of the metal plate (3) is 0.5-2 mm; the metal plate (3) is a steel plate, and the outer surface of the steel plate is provided with a zinc plating layer, a zinc alloy plating layer or an electrophoretic paint protective layer.

7. The battery undertray of claim 1, wherein, The non-metal plate area of the battery bottom guard plate has a mounting hole for accommodating a steel bushing (7) and a screw (8).

8. The battery undertray of claim 7, wherein, The opening spacing of the mounting hole is 20-150 mm, and the distance from the hole edge of the mounting hole to the edge of the battery bottom guard plate is 2-40 mm.

9. The battery undertray of claim 7, wherein, The steel bushing (7) protrudes 0.05-0.55 mm from the screw mounting surface of the battery bottom guard plate.

10. The battery undertray of claim 1, wherein, It also comprises: A foamed silica gel sealing gasket (9) is bonded to the mounting surface of the battery bottom guard plate.

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