Floor protection plate and battery housing

Abstract

A floor protection panel comprising: an upper skin (10); a lower skin (20), wherein the lower skin (20) and the upper skin (10) are arranged at intervals; an intermediate layer (30) clamped between the upper skin (10) and the lower skin (20); wherein a thickness of the upper skin (10) is greater than a thickness of the lower skin (20).

Description

Technical FieldThe application relates to the field of battery technology, in particular to a floor protection plate and a battery housing.Prior ArtIn the field of battery technology, it is often necessary to use a ground protection plate to protect the power battery, thereby preventing the power battery from being hit by foreign matter during vehicle operation.In related technologies, the floor protection plate is typically an aluminum alloy plate or steel plate formed by integral die casting.Disclosure of the ApplicationHowever, the floor protection plate formed by integral die casting not only has high manufacturing cost but also has poor shock resistance. Upon exposure to the external impact force, the ground protection panel is often prone to deformation, which may result in damage to the internal battery cells.The application provides a floor protection panel. The floor protection panel includes a scalp, a scalp, and an intermediate layer. The scalp and the subcutaneous are spaced apart, and the intermediate layer is pinched between the scalp and the subcutaneous, the thickness of the scalp being greater than the thickness of the subcutaneous.The application further provides a battery housing. The battery case includes the above-mentioned bottom protection plate.Advantageous EffectsIn the present embodiments, a multilayer structure of the floor protection panel is formed based on the scalp, the intermediate layer and the sub-skin, thereby increasing the strength of the floor protection panel and improving its impact resistance and deformation resistance. Based on the fact that the thickness of the scalp is greater than the thickness of the subcutaneous, it allows, on the one hand, the scalp to better resist deformation in the thickness direction in order to ensure that the floor protection panel can meet the usage requirements. On the other hand, the reduction of the use of materials for the sub-skin is made possible, so that the entire floor protection panel becomes thinner and lighter. Thus, the production cost can be lowered while ensuring that the overall strength of the floor protection panel is in conformity with the standard.Brief Description of the DrawingsFIG. 1 is a three-dimensional schematic diagram of a ground protection panel according to the embodiments of the present application. FIG. 2 is a schematic diagram of an exploded structure of a floor protection panel according to the embodiments of the present application. FIG. 3 is a schematic diagram of a structure of a floor protection panel according to the embodiments of the present application after the floor protection panel is subjected to force deformation. FIG. 4 is a schematic diagram of a structure of a floor protection panel according to the embodiments of the present application after the floor protection panel is subjected to force deformation.Reference Number:10. Scalp; 20th Unter; 30th Zwischenschicht; 40th Puffer portion.DETAILED EMBODIMENTSReferring to FIGS. 1-4, embodiments of the application provide a floor protection panel. The floor protection panel includes a skin 10, a skin 20, and an intermediate layer 30. the skin 20 and the skin 10 are spaced apart. The intermediate layer 30 is clamped between the upper skin 10 and the lower skin 20. The thickness of the upper skin 10 is greater than the thickness of the lower skin 20.In the present embodiments, a multilayer structure of the floor protection panel is formed based on the upper skin 10, the intermediate layer 30, and the lower skin 20, thereby enhancing the strength of the floor protection panel and improving its impact resistance and deformation resistance. On the one hand, based on the fact that the thickness of the skin 10 is greater than that of the skin 20, it allows the skin 10 to better resist deformations in the thickness direction and to ensure that the floor protection panel can meet the usage requirements. On the other hand, it enables the reduction of the use of materials for the under skin 20, so that the entire floor protection panel becomes thinner and lighter. Thus, the production cost can be lowered while ensuring that the overall strength of the floor protection panel is in conformity with the standard.It can be understood that when the floor protection panel is subjected to an external impact force, the impact force first acts on the sub-skin 20. When the under skin 20 can resist deformation caused by the impact force, the floor protection panel can be prevented from deforming due to external impact force. When the under skin 20 deforms due to excessive impact force, the under skin 20 may consume part of the energy of the impact force, thereby reducing the impact force on the intermediate layer 30 and the upper skin 10, so that the intermediate layer 30 and the upper skin 10 are less susceptible to the deformations. By forming a multilayer structure of the floor protection panel, the external impact force can be gradually alleviated, resulting in less deformation of the innermost scalp 10. And the general deformation resistance of the bottom protection plate is strong to prevent damage to the battery cells.Further, since the thickness of the upper skin 10 is larger than the thickness of the lower skin 20, the intermediate layer 30 may be located at a lower position, so that the intermediate layer 30 can quickly influence deformation resistance against the external impact force, thereby ensuring the Z-direction deformation resistance effect. Based on the structural design of the dissimilar thickness and fully utilizing the mechanical properties of the scalp 10, the intermediate layer 30, and the subcutaneous 20, the dissimilar thickness floor protection panel has a better protection effect than the floor protection panel having a structure of the same thickness.In some embodiments, both the upper skin 10 and the lower skin 20 are resin layers, and the mesh fiber structures are embedded in the resin layers. Embedding a mesh fiber structure in the resin layer may allow forming a continuous fiber-reinforced resin-base composite layer. By setting both the upper skin 10 and the lower skin 20 as the continuous fiber-reinforced resin-base composite material layers and sandwiching the intermediate layer 30 between the upper skin 10 and the lower skin 20, the multilayer structure of the floor protection panel can be formed to improve the energy absorbing effect of the floor protection panel. As a result, the floor protection panel has good deformation resistance in both the horizontal direction and the thickness direction, thereby ensuring that the floor protection panel has good strength as well as properties of wear resistance and insulation and corrosion protection.By using the continuous fiber-reinforced resin-base composite layers as the upper skin 10 and the lower skin 20, the upper skin 10 and the lower skin 20 can have a density of up to 2150 kg / m 3( kilograms per cubic meter) and have excellent tensile strength. When the floor protection plate deforms due to exposure to force, the upper skin 10 and the lower skin 20 may exhibit good deformation resistance in the XY direction (horizontal plane direction) and also may exhibit good deformation resistance in the Z-axis direction (thickness direction) to prevent damage to the battery cells.It can be understood that when the ground protection panel is deformed by external force collision, the action force can be transmitted in one direction from the subcutaneous 20 to the scalp 10. The action force can be distributed in the XY direction by the mesh fiber structure, thereby reducing the deformation in the Z direction. Due to the greater thickness of the skin 10, the skin 10 can better resist deformation in the Z direction.As shown in FIGS. 3 and 4, the upper skin 10, the intermediate layer 30, and the lower skin 20 form a multilayer structure of the floor protection panel, whereby the floor protection panel more conforms to the impact resistance principle. When the under skin 20 is subjected to an impact, the force can be dispersed in the XY direction in the under skin 20 by the mesh fiber structure, and the intermediate intermediate middle layer 30 has a larger force range when subjected to the force. Based on the high strength and low toughness of the intermediate layer 30 itself, the force in the XY direction can be rapidly dispersed, whereby the deformation occurs in a larger area of the intermediate layer 30, but with less deformation in the Z direction. When the force is transmitted to the skin 10, the net fiber structure in the thickened skin 10 can retain the intermediate layer 30 to resist deformation of the entire bottom protection panel in the Z direction. As a result, the deformation of the entire bottom protection plate in the Z direction becomes less, whereby the internal structure of the battery pack can be protected. And since the thickness of the upper skin 10 is larger than the thickness of the lower skin 20, the intermediate layer 30 may be at the lower position, so that the intermediate layer 30 can quickly influence deformation resistance against the external impact force, thereby ensuring the Z-direction deformation resistance effect. Based on the structural design of the dissimilar thickness and fully utilizing the mechanical properties of the scalp 10, the intermediate layer 30, and the subcutaneous 20, the dissimilar thickness floor protection panel has a better protection effect than the floor protection panel having a structure of the same thickness.Here, the multilayer structure of the floor protection panel formed by the upper skin 10, the intermediate layer 30, and the lower skin 20 is a flat panel structure, so that the floor protection panel has no style and no lifting point, thereby avoiding vehicle tilting and control loss in the case of a floor collision.In some embodiments, the resin layer includes one or more of a polyvinyl chloride layer, a polypropylene layer, a polyurethane layer, a polyamide layer, a polycarbonate layer, a polyethylene plastic layer, and a polyphenylene ether layer. When the resin layer is set to plural ones, the plural layers are stacked. And / or, the net fiber structure comprises one or more of a fiberglass layer, a continuous aramid fiber layer, a basalt fiber layer, and a carbon fiber layer. When the network fiber structure is set to plural ones, the plural layers are stacked.It can be understood that the continuous fiber-reinforced resin base composite material layer includes the resin layer and the mesh fiber structure embedded in the resin layer. The net fiber structure is embedded in the resin layer to reinforce the structure of the resin layer, whereby the upper skin 10 and the lower skin 20 have good tensile strength.Here, the net fiber structure includes one or more of a glass fiber layer, a continuous aramid fiber layer, a basalt fiber layer, and a carbon fiber layer. For the net fiber structure of the upper skin 10 and the lower skin 20, the same fiber layers or the different fiber layers may be selected. When there are a plurality of network fiber structures in the scalp 10, the same fiber layers or the different fiber layers may be selected for the plurality of network fiber structures in the scalp 10, and the plurality of network fiber structures are stacked layer by layer in sequence. When there are multiple fiber layers in the sub skin 20, the same fiber layers or the different fiber layers may be selected for the multiple fiber layers in the sub skin 20, and the multiple mesh fiber structures are stacked layer by layer in sequence.Here, the resin layer includes one or more of a polyvinyl chloride layer, polypropylene layer, polyurethane layer, polyamide layer, polycarbonate layer, polyethylene resin layer, and polyphenylene ether layer. For the resin layers of the upper skin 10 and the lower skin 20, the same resin layers or the different resin layers may be selected. When there are a plurality of resin layers in the scalp 10, the same resin layers or the different resin layers may be selected for the plurality of resin layers in the scalp 10, and the plurality of resin layers are stacked layer by layer in sequence. When there are a plurality of resin layers in the sub skin 20, the same resin layers or the different resin layers may be selected for the plurality of resin layers in the sub skin 20, and the plurality of resin layers are stacked layer by layer in sequence.Based on the selection of the material for the scalp 10 and the subcutaneous 20, the scalp 10 and subcutaneous 20 may both have excellent tensile strength and a density of up to 2150 kg / m 3. Both the upper skin 10 and the lower skin 20 have good deformation resistance in the XY direction and can resist deformation in the Z direction, while also having properties of wear resistance and insulation and corrosion protection. As a result, the upper skin 10 and the lower skin 20 are lighter and can be made thinner, which is conducive to the light and thin design of the floor protection panel.For example, when the resin layer is the polyvinyl chloride layer and the network fiber structure is the glass fiber layer, the glass fiber layer may be directly embedded in the polyvinyl chloride layer to form the continuous fiber-reinforced resin-base composite layer as the upper skin 10 and the lower skin 20.For example, when the resin layer is polyvinyl chloride and polypropylene layers stacked on each other and the network fiber structure is the glass fiber layer, a glass fiber layer may be embedded in both the polyvinyl chloride layer and the polypropylene layer to form the continuous fiber-reinforced resin composite material layer as the scalp 10 and the subcutaneous 20. Alternatively, a glass fiber layer may be embedded between the polyvinyl chloride layer and the polypropylene layer to form the continuous fiber-reinforced resin composite material layer as the skin 10 and the skin 20.For example, when the resin layer is the polyvinyl chloride layer and the network fiber structure is the glass fiber and carbon fiber layers stacked on each other, the stacked glass fiber and carbon fiber layers may be embedded in the polyvinyl chloride layer to form the continuous fiber-reinforced resin composite material layer as the scalp 10 and the subcutaneous 20.For example, when the resin layer is the polyvinyl chloride and polypropylene layers stacked on each other and the network fiber structure is the glass fiber and carbon fiber layers stacked on each other, the glass fiber and carbon fiber layers stacked on each other may be embedded in both the polyvinyl chloride layer and the polypropylene layer to form the continuous fiber-reinforced resin composite material layer as the upper skin 10 and the lower skin 20. Alternatively, the glass fiber and carbon fiber layers stacked on each other may be sandwiched between the polyvinyl chloride layer and the polypropylene layer to form the continuous fiber-reinforced resin composite material layer as the upper skin 10 and the lower skin 20.In some embodiments, the thickness of the scalp 10 is 2 to 3 times the thickness of the subcutaneous 20 and / or the thickness of the scalp 10 is 1.2 millimeters to 3 millimeters.By making the thickness of the skin 10 2 to 3 times the thickness of the skin 20, it is ensured that the skin 10 has good Z-direction deformation resistance. At the same time, an increase in the weight and cost of the floor protection panel due to an excessive thickness of the skin 10 can be prevented.It can be understood that when the thickness of the skin 10 is only 1.5 times the thickness of the skin 20, the deformation resistance of the skin 10 in the Z direction cannot satisfy the usage requirements, resulting in a certain safety risk of the battery pack. When the thickness of the skin 10 is 4 times the thickness of the skin 20, the material and weight of the skin 10 are relatively large, resulting in an increase in the overall weight, cost and thickness of the floor protection panel and thus not conducive to the light and thin and low cost design of the floor protection panel.For example, the thickness of the scalp 10 is 1.2 millimeters, 1.8 millimeters, 2 millimeters, 2.4 millimeters, 3 millimeters, or any value between both arbitrary values. The thickness of the under skin 20 is 0.4 millimeter, 0.6 millimeter, 1 millimeter, 1.5 millimeter, or any value between both arbitrary values.In some embodiments, the intermediate layer 30 is a steel plate and has a thickness of 0.8 millimeters to 1.2 millimeters.Using the steel plate as the intermediate layer 30, the steel plate can transmit the action force of the sub skin 20 in its own XY direction to resist deformation in the Z direction to some extent and provide a protection effect for the battery cell.For example, the thickness of the intermediate layer 30 is 0.8 millimeter, 1 millimeter, 1.2 millimeter, or any value between both arbitrary values. When the thickness of the intermediate layer 30 is less than 0.8 millimeter, the deformation resistance of the steel plate in the Z direction may not satisfy the usage requirements, which leads to a certain safety risk for the battery pack. If the thickness of the intermediate layer 30 is greater than 1.2 millimeters, the weight of the steel plate is relatively large, resulting in an increase in the overall weight, cost, and thickness of the floor protection panel, which is not conducive to the light and thin and low cost design of the floor protection panel.For example, the intermediate layer 30 may take DP780 steel plate, DP980 steel plate, DP1180 steel plate, DP1310 steel plate, DP1470 steel plate, HC1200 / 1500MS steel plate, or HC1350 / 1700MS steel plate. As a result, the intermediate layer 30 can have a tensile strength of 800 MPa to 1700 MPa (megapascals) and a yield strength of 800 MPa to 1500 MPa, and has advantages of low toughness, high wear resistance, and high rigidity. Thus, the intermediate layer 30 can well resist a stitch and a deformation in the Z direction.It can be understood that when the sub skin 20 is subjected to an impact, the force in the XY direction can be dispersed through the mesh fiber structure in the sub skin 20, and the intermediate intermediate middle layer 30 has a larger force range when subjected to the force. Based on the high strength and low toughness of the steel plate itself, the force can be rapidly dispersed in the XY direction of the steel plate, and the deformation can occur in a larger area of the steel plate, thereby decreasing the deformation of the steel plate in the Z direction. When the force is transmitted from the steel plate to the scalp 10, the net fiber structure in the thickened scalp 10 can hold the steel plate to resist deformation of the entire floor protection plate in the Z direction. As a result, the deformation of the entire bottom protection plate in the Z direction becomes less, whereby the internal structure of the battery pack can be protected. Further, since the thickness of the upper skin 10 is larger than the thickness of the lower skin 20, the steel plate may be located at a lower position, so that the steel plate can quickly deal with deformation resistance against the external impact force, thereby ensuring the Z-direction deformation resistance effect.In some embodiments, there is an adhesive layer between the intermediate layer 30 and the scalp 10 and / or an adhesive layer between the intermediate layer 30 and the subcutaneous 20.Based on the intermediate layer 30 being the steel plate and the skin 10 and the skin 20 being the continuous fiber-reinforced resin composite material layers, due to the good polarity properties and easy adhesion of polymer materials, a reliable bond can be formed between the skin 10, the intermediate layer 30, and the skin 20 by bonding, thereby ensuring the structural stability of the floor protection panel.For example, in adhering the skin 10, the intermediate layer 30, and the skin 20, an adhesive may be applied between the skin 10 and the intermediate layer 30, and an adhesive may be applied between the skin 20 and the intermediate layer 30. Then, the adhesive area of the adhesive between the skin 10, the intermediate layer 30, and the skin 20 is increased by hot pressing, and after the bonding is completed, the adhesive is cured to form an adhesive layer.For example, in adhering the upper skin 10, the intermediate layer 30, and the lower skin 20, a solid film may be placed between the upper skin 10 and the intermediate layer 30, and a solid film may be placed between the lower skin 20 and the intermediate layer 30. Then, the solid film is softened by hot pressing to adhere the upper skin 10, the intermediate layer 30, and the lower skin 20. After the bonding is completed, the curing is performed again to form an adhesive layer.The upper skin 10 and the lower skin 20 are bonded to the upper and lower sides of the intermediate layer 30 by bonding and hot pressing, so that the molded floor protection panel does not require surface treatment, while ensuring that the floor protection panel has very good strength and rigidity and has advantages of light weight and low cost.As shown in FIGS. 1 and 2, in some embodiments, a buffer portion 40 is provided on a side of the scalp 10 opposite to the intermediate layer 30. The buffer portion 40 may support the battery cell and may provide a certain buffer effect during assembly of the battery pack and after assembly of the battery pack in the vehicle. For example, during assembly of the battery pack, the buffer portion 40 may support the tray to facilitate welding and fastening of the tray, and the buffer portion 40 may play a buffer effect during tray welding. When the vehicle runs on a rough road, the buffer portion 40 may cause a buffer action on the battery cell to prevent damage to the battery cell.At this time, the buffer portion 40 may be set in the shape of a cylinder, a rectangular parallelepiped, a prism, an elliptic cylinder, etc. to ensure that the buffer portion 40 can play a buffer effect.The buffer portion 40 may be bonded to the skin 10 by bonding.In some embodiments, the number of the buffer portions 40 is set to plural ones, and the plural buffer portions 40 are spacedly distributed on the upper skin 10. The plurality of buffer portions 40 may be distributed in an array or randomly on the upper surface of the scalp 10. For example, the number of buffer portions 40 is set to 24, and the 24 buffer portions 40 can be uniformly distributed on the upper surface of the scalp 10 in a 4*6 pattern. For example, the number of buffer portions 40 is set to 18, and the 18 buffer portions 40 can be randomly distributed on the upper surface of the scalp 10.In some embodiments, the buffer portion 40 includes one or more of an organic silicone buffer portion, a polyurethane buffer portion, an ethylene vinyl acetate buffer portion, a polypropylene buffer portion, and an ethylene propylene diene monomer rubber buffer portion. The thickness of the buffer section 40 is 5 millimeters to 20 millimeters.When the number of buffer portions 40 is set to plural, the materials of plural buffer portions 40 may be the same or different. Based on the selection of organic silicone, polyurethane, ethylene vinyl acetate, polypropylene, or ethylene propylene diene monomer rubber as the buffer portion 40, the buffer portion 40 can play a good shock absorbing and buffering effect to ensure the safety of the battery pack.For example, the thickness of the buffer portion 40 is 5 millimeters, 10 millimeters, 15 millimeters, or 20 millimeters, or any value between both arbitrary values. If the thickness of the buffer portion 40 is less than 5 millimeters, the shock absorbing and buffering action of the buffer portion 40 deteriorates, which may lead to inability to protect the battery cell. When the thickness of the buffer portion 40 is greater than 20 millimeters, the space occupied by the buffer portion 40 in the thickness direction is greater, which affects the thickness of the entire structure of the battery pack and is not conducive to the light and thin design of the floor protection panel.Therefore, there is no need to use molds during the production phase, which can save tool cost, simplify the process flow, and reduce process cost. At the same time, the weight of the floor protection panel becomes lighter, which corresponds to the design concept of lightweighting of the vehicle and is conducive to increasing the reach of the entire vehicle. The multilayer structural design of the bottom protection plate gives it good shock resistance, the external force can be dispersed in the XY direction, and the deformation in the Z direction can be reduced, thereby achieving the protection effect of the battery pack.On the other hand, the present embodiments further provide a battery case. The battery housing includes a bottom protection plate.In the present embodiments, a multilayer structure of the floor protection panel is formed based on the upper skin 10, the intermediate layer 30, and the lower skin 20, thereby enhancing the strength of the floor protection panel and improving its impact resistance and deformation resistance. Based on the fact that the thickness of the skin 10 is greater than the thickness of the skin 20, it allows, on the one hand, the skin 10 to better resist deformation in the thickness direction in order to ensure that the floor protection panel can meet the usage requirements. On the other hand, the reduction in the use of materials for the under skin 20 is made possible, so that the entire floor protection panel becomes thinner and lighter. Thus, the production cost can be lowered while ensuring that the overall strength of the floor protection panel is in conformity with the standard.

Claims

A ground protection panel, comprising: an upper skin (10); a lower skin (20), wherein the lower skin (20) and the upper skin (10) are spaced apart; an intermediate layer (30) sandwiched between the upper skin (10) and the lower skin (20); wherein a thickness of the upper skin (10) is greater than a thickness of the lower skin (20).The floor protection panel according to claim 1, wherein the thickness of the skin (10) is 2 to 3 times the thickness of the skin (20) and / or the thickness of the skin (10) is 1.2 millimeters to 3 millimeters.The floor protection panel according to claim 1 or 2, wherein the upper skin (10) and the lower skin (20) are each a resin layer, wherein a mesh fiber structure is embedded in the resin layer.The floor protection panel of claim 3, wherein the resin layer comprises one or more of a polyvinyl chloride layer, a polypropylene layer, a polyurethane layer, a polyamide layer, a polycarbonate layer, a polyethylene plastic layer, and a polyphenylene ether layer, and / or the network fiber structure comprises one or more of a glass fiber layer, a continuous aramid fiber layer, a basalt fiber layer, and a carbon fiber layer.The floor protection panel according to claim 4, wherein when the resin layer is set to plural ones, the plural layers are stacked; and / or when the mesh fiber structure is set to plural ones, the plural layers are stacked.The floor protection panel according to any one of claims 1-5, wherein the intermediate layer (30) is a steel plate, and a thickness of the intermediate layer (30) is 0.8 millimeter to 1.2 millimeter.Floor protection panel according to any of claims 1-6, wherein an adhesive layer is located between the intermediate layer (30) and the scalp (10) and / or an adhesive layer is located between the intermediate layer (30) and the scalp (20).The floor protection panel according to any one of claims 1-7, wherein a buffer portion (40) is provided on a side of the upper skin (10) facing away from the intermediate layer (30), the number of the buffer portion (40) is set to plural ones, and the plural buffer portions (40) are spacedly distributed on the upper skin (10).The floor protection panel of claim 8, wherein the buffer portion (40) comprises one or more of an organic silicone buffer portion, a polyurethane buffer portion, an ethylene vinyl acetate buffer portion, a polypropylene buffer portion, and an ethylene propylene diene monomer rubber buffer portion.The floor protection panel according to claim 8 or 9, wherein a thickness of the buffer portion (40) is 5 millimeters to 20 millimeters.A battery housing comprising a ground protection panel according to any of claims 1-10.

Images