Battery protection base plate, battery pack composite protection structure, and vehicle

Abstract

Battery protection bottom plate, battery pack composite protection structure, and vehicle. The battery protection bottom plate includes an upper fiber-reinforced resin layer, a metal plate, and a lower fiber-reinforced resin layer, and the metal plate is located between the upper fiber-reinforced resin layer and the lower fiber-reinforced resin layer, and the following condition is satisfied: (I) TIFF2025515557000015.tif13150

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure is based on Chinese Patent Application No. 202210609361.0, filed on May 31, 2022, and claims priority to the above-mentioned Chinese patent application, the entire contents of which are incorporated herein by reference.

[0002] Technical Field The present disclosure relates to the technical field of vehicle batteries, and in particular to a battery protection bottom plate, a battery pack composite protection structure, and a vehicle. [Background technology]

[0003] The battery pack of a new energy electric vehicle is usually placed at the bottom of the vehicle. Due to facing complex working conditions, the battery pack is easily impacted by hard objects such as external stones when the vehicle is running. Therefore, it is usually necessary to take certain protective measures at the bottom of the battery pack to prevent the battery pack from being affected by impact, otherwise it will cause problems of surface damage and electrolyte leakage. The existing battery pack bottom protection method mainly protects the bottom of the battery pack by providing a steel plate. In order to prevent the steel plate from being corroded by water vapor and other factors, the anti-corrosion treatment adopts the electrophoresis process. In addition, since the bottom of the steel plate is directly exposed at the bottom of the vehicle body, it is necessary to spray a PVC layer with a thickness ranging from 0.5 mm to 1.2 mm on the side facing the ground of the steel plate, so as to withstand the impact of stones and prevent the electrophoresis layer from being scratched, thereby avoiding affecting the anti-corrosion effect.

[0004] Since flat steel plates have low overall rigidity, they need to be punched. However, it is difficult to punch the high-strength steel plates used in the existing battery pack bottom protection structures, which has the problem of affecting production efficiency. In addition, the existing steel plates have low overall impact resistance, and the steel plates generate high vibrations when impacted. This makes it easy for rivets and other connecting members to be damaged or detached at the location where the steel plate is attached, and the PVC layer on the surface of the steel plate is easy to be detached due to impact, which affects the corrosion resistance of the steel plate. Summary of the Invention [Means for solving the problem]

[0005] In response to the problem that existing battery pack bottom protection structures have insufficient impact resistance and cause poor connection under vibration conditions, the present disclosure provides a battery protection bottom plate, a battery pack composite protection structure, and a vehicle.

[0006] The technical solutions adopted by the present disclosure to solve the above technical problems are as follows:

[0007] In a first aspect, the present disclosure provides a battery protective bottom plate, including an upper fiber-reinforced resin layer, a metal plate, and a lower fiber-reinforced resin layer. The metal plate is located between the upper fiber-reinforced resin layer and the lower fiber-reinforced resin layer. The metal plate, the upper fiber-reinforced resin layer, and the lower fiber-reinforced resin layer satisfy the following conditions:

[0008]

number

[0009] In the formula, d 1 is the thickness of the lower fiber-reinforced resin layer in mm, and d 2 is the thickness of the metal plate in mm, and d 3 is the thickness of the upper fiber-reinforced resin layer in mm, and ρ 1 is g / cm 3 is the density of the lower fiber-reinforced resin layer of the unit, and ρ 2 is g / cm3 is the density of the metal plate in units, and ρ 3 is g / cm 3 is the density of the upper fiber-reinforced resin layer in units, and σ 1 is the tensile strength of the lower fiber-reinforced resin layer in MPa, and σ 2 is the tensile strength of the metal sheet in MPa, and σ 3 is the tensile strength of the upper fiber-reinforced resin layer in MPa.

[0010] In some embodiments, the metal plate, the upper fiber-reinforced resin layer, and the lower fiber-reinforced resin layer satisfy the following conditions:

number

[0011] In some embodiments, the thickness d of the upper fiber-reinforced resin layer 3 is in the range of 0.4 mm to 1.6 mm, and the thickness of the lower fiber-reinforced resin layer d 1 is in the range of 0.6mm to 2mm.

[0012] In some embodiments, the thickness of the metal plate, d 2 is in the range of 0.7mm to 1.6mm.

[0013] In some embodiments, the density of the metal plate ρ 2 is 2.7g / cm 3 ~8.5g / cm 3 The range is.

[0014] In some embodiments, the density ρ of the upper fiber-reinforced resin layer 3 is 1.3g / cm 3 ~1.9g / cm 3 The density of the lower fiber-reinforced resin layer is in the range of ρ 1 is 1.3g / cm 3 ~1.9g / cm 3 The range is.

[0015] In some embodiments, the tensile strength of the metal plate σ 2 is in the range of 590MPa to 1180MPa.

[0016] In some embodiments, the tensile strength σ of the upper fiber-reinforced resin layer 3 is in the range of 240MPa to 380MPa, and the tensile strength σ of the lower fiber-reinforced resin layer 1 is in the range of 240MPa to 380MPa.

[0017] In some embodiments, the battery protective bottom plate further includes a fiber reinforced resin frame. The metal plate and the fiber reinforced resin frame are located between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer. The metal plate is located inside the fiber reinforced resin frame. The top surface of the fiber reinforced resin frame is integrally connected to the upper fiber reinforced resin layer, and the bottom surface of the fiber reinforced resin frame is integrally connected to the lower fiber reinforced resin layer.

[0018] In some embodiments, a plurality of mounting holes are spaced inside the edge of the battery protective base plate, the mounting holes passing sequentially through the upper fiber reinforced resin layer, the fiber reinforced resin frame, and the lower fiber reinforced resin layer.

[0019] In some examples, the upper fiber reinforced resin layer, the fiber reinforced resin frame, and the lower fiber reinforced resin layer are each independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

[0020] In some embodiments, the upper fiber reinforced resin layer, the fiber reinforced resin frame, and the lower fiber reinforced resin layer are each a glass fiber reinforced resin member, the glass fiber reinforced resin member containing a glass fiber content in the range of 50% to 70%, and the glass fiber having an alkali content of less than 0.8%.

[0021] In some examples, the upper fiber reinforced resin layer includes multiple layers of a first fiber reinforced prepreg laminated together, the fiber reinforced resin frame includes multiple layers of a second fiber reinforced prepreg laminated together, and the lower fiber reinforced resin layer includes multiple layers of a third fiber reinforced prepreg laminated together.

[0022] In some embodiments, the metal plate is a steel plate, and the zinc-plated layer, zinc-plated iron alloy layer, or electrophoretic paint protective layer is disposed on an outer surface of the steel plate.

[0023] In another aspect, the present disclosure further provides a battery pack composite protection structure, including a battery pack and a battery protection bottom plate as described above, wherein the battery protection bottom plate is disposed below the battery pack, and a buffer area is formed between the battery pack and the battery protection bottom plate.

[0024] In some embodiments, the buffer region is filled with a buffer layer, the buffer layer being selected from a honeycomb material or a rigid foam material.

[0025] In another aspect, the present disclosure provides a vehicle including a battery protection base plate or a battery pack composite protection structure as described above.

[0026] In the battery protection bottom plate according to the present disclosure, the upper fiber-reinforced resin layer and the lower fiber-reinforced resin layer are combined on the front and rear surfaces of the metal plate, so that on the one hand, the upper fiber-reinforced resin layer and the lower fiber-reinforced resin layer can improve the corrosion resistance of the metal plate. In addition, the lower fiber-reinforced resin layer can withstand the impact of stones or the like on the bottom of the battery protection bottom plate, thereby avoiding the problem of corrosion of the impacted part. On the other hand, after the upper fiber-reinforced resin layer and the lower fiber-reinforced resin layer are combined with the metal plate, the rigidity and strength of the metal plate are effectively improved, and the metal plate has higher impact resistance, so that there is no need to additionally punch the metal plate, thereby improving production efficiency.

[0027] Furthermore, in order to improve the impact resistance of the battery protection bottom plate, the thickness d 3 and the thickness of the lower fiber-reinforced resin layer d1 and the thickness of the metal plate, d 2 and the density of the metal plate, ρ 2 and the density ρ of the upper fiber-reinforced resin layer 3 and the density ρ of the lower fiber-reinforced resin layer 1 and the tensile strength of the metal plate σ 2 and the tensile strength σ of the upper fiber-reinforced resin layer 3 and the tensile strength σ of the lower fiber-reinforced resin layer 1 There is a clear correlation between the thickness of the upper fiber-reinforced resin layer d 3 and the thickness of the lower fiber-reinforced resin layer d 1 and the thickness of the metal plate, d 2 and the density of the metal plate, ρ 2 and the density ρ of the upper fiber-reinforced resin layer 3 and the density ρ of the lower fiber-reinforced resin layer 1 and the tensile strength of the metal plate σ 2 and the tensile strength σ of the upper fiber-reinforced resin layer 3 and the tensile strength σ of the lower fiber-reinforced resin layer 1 But,

number

[0028] [Figure 1] 1 is a schematic structural diagram of a battery protection bottom plate according to an embodiment of the present disclosure; [Diagram 2] FIG. 2 is a schematic structural diagram of different first fiber reinforced prepreg unidirectional tapes in an upper fiber reinforced resin layer according to one embodiment of the present disclosure. [Diagram 3] FIG. 2 is a schematic structural diagram of different first fiber fabric reinforced prepregs in an upper fiber reinforced resin layer according to one embodiment of the present disclosure. [Figure 4]1 is a schematic structural diagram of a battery pack composite protective structure according to an embodiment of the present disclosure; [Diagram 5] FIG. 5 is a schematic enlarged view of a portion A in FIG. [Figure 6] 1 is a schematic cross-sectional view of the bottom of a battery pack composite protective structure according to an embodiment of the present disclosure. FIG. [Figure 7] 1 is a schematic cross-sectional view of the bottom of a battery pack composite protective structure according to another embodiment of the present disclosure. FIG. [Figure 8] 13 is a schematic cross-sectional view of the bottom of a battery pack composite protective structure according to yet another embodiment of the present disclosure. FIG. [Figure 9] 1 is a schematic diagram of a vehicle according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] In order to make the technical problems, technical solutions and beneficial effects of the present disclosure clearer, the present disclosure will be described in more detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to illustrate the present disclosure, and are not intended to limit the present disclosure.

[0030] In the description of this disclosure, it should be understood that the orientations or positions indicated by terms such as "upper", "lower", "top", "bottom", "inside" and "outside" are based on the orientations or positions shown in the accompanying drawings, and do not indicate or imply that the devices or elements referred to have a particular orientation or are required to be constructed and operated in a particular orientation, but are merely intended to facilitate and simplify the description of the disclosure, and therefore cannot be construed as limiting the disclosure. In the description of this disclosure, unless otherwise specified, "plurality" means two or more.

[0031] As shown in Fig. 1, an embodiment of the present disclosure provides a battery protection bottom plate 1 including an upper fiber-reinforced resin layer 11, a metal plate 12, and a lower fiber-reinforced resin layer 14. The metal plate 12 is located between the upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14. The metal plate 12, the upper fiber-reinforced resin layer 11, and the lower fiber-reinforced resin layer 14 satisfy the following conditions:

[0032]

number

[0033] In the formula, d 1 is the thickness of the lower fiber-reinforced resin layer 14 in mm, and d 2 is the thickness of the metal plate 12 in mm, and d 3 is the thickness of the upper fiber-reinforced resin layer 11 in mm, and ρ 1 is g / cm 3 is the density of the lower fiber-reinforced resin layer 14 per unit, and ρ 2 is g / cm 3 is the density of the metal plate 12 in units, and ρ 3 is g / cm 3 is the density of the upper fiber-reinforced resin layer 11 in units of 1 is the tensile strength of the lower fiber-reinforced resin layer 14 in MPa, and σ 2 is the tensile strength of the metal plate 12 in MPa, and σ 3 is the tensile strength of the upper fiber reinforced resin layer 11 in MPa.

[0034] The upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14 are compounded on the front and rear surfaces of the metal plate 12, so that on the one hand, the upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14 can improve the corrosion resistance of the metal plate 12. In addition, the lower fiber-reinforced resin layer 14 can withstand the impact of stones or the like on the bottom of the battery protection bottom plate 1, thereby avoiding the problem of corrosion of the impacted part. On the other hand, after the upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14 are compounded with the metal plate 12, the rigidity and strength of the metal plate 12 are effectively improved, and the metal plate has higher impact resistance, so that there is no need to additionally punch the metal plate 12, thereby improving production efficiency.

[0035] Furthermore, from the viewpoint of improving the impact resistance of the battery protection bottom plate 1, the thickness d 3 and the thickness d of the lower fiber-reinforced resin layer 14 1 and the thickness d of the metal plate 12 2 and the density ρ of the metal plate 12 2 and the density ρ of the upper fiber reinforced resin layer 11 3 and the density ρ of the lower fiber-reinforced resin layer 14 1 and the tensile strength σ of the metal plate 12 2 and the tensile strength σ of the upper fiber reinforced resin layer 11 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 Specifically, there is a clear correlation between the thickness d of the upper fiber-reinforced resin layer 11 and 3 and the thickness d of the lower fiber-reinforced resin layer 14 1 and the thickness d of the metal plate 12 2 and the density ρ of the metal plate 12 2 and the density ρ of the upper fiber reinforced resin layer 11 3 and the density ρ of the lower fiber-reinforced resin layer 14 1 and the tensile strength σ of the metal plate 12 2 and the tensile strength σ of the upper fiber reinforced resin layer 11 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 But,

number

[0036] In some embodiments, the metal plate 12, the upper fiber-reinforced resin layer 11, and the lower fiber-reinforced resin layer 14 satisfy the following conditions:

number

[0037] By defining the above relationship, the effects of the material selection of the metal plate 12, the upper fiber-reinforced resin layer 11, and the lower fiber-reinforced resin layer 14 on the impact resistance of the battery pack 3 can be synthesized, which is beneficial to improving the service life of the battery pack 3.

[0038] In some embodiments, the thickness d of the upper fiber-reinforced resin layer 11 3 is in the range of 0.4 mm to 1.6 mm, and the thickness d 1 is in the range of 0.6mm to 2mm.

[0039] Specifically, the thickness d of the upper fiber-reinforced resin layer 11 3 The thickness d of the lower fiber-reinforced resin layer 14 may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, etc. 1 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, etc.

[0040] Thickness d of the upper fiber-reinforced resin layer 11 3 and the thickness d of the lower fiber-reinforced resin layer 14 1The thickness d of the upper fiber-reinforced resin layer 11 affects the protective effect on the metal plate 12 and the improving effect on the mechanical properties of the metal plate 12. 3 and the thickness d of the lower fiber-reinforced resin layer 14 1 When the amount of the fluorine-containing compound falls within the above range, the fluorine-containing compound can be prevented from falling off the surface of the metal plate 12 under high-energy impact, and the corrosion prevention and strength-improving effects on the metal plate 12 can be effectively maintained.

[0041] In some embodiments, the thickness d of the metal plate 12 2 is in the range of 0.7mm to 1.6mm.

[0042] Specifically, the thickness d of the metal plate 12 2 can be 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc.

[0043] Thickness d of metal plate 12 2 affects the overall mechanical strength of the battery protection bottom plate 1. When the tensile strength of the metal plate 12 is constant, its protection strength increases gradually with the increase in the thickness of the metal plate 12, but its material cost also increases gradually, and the minimum ground clearance of the bottom of the vehicle 100 is reduced. 2 When is within the above range, the overall mechanical strength of the battery protection bottom plate 1 can be ensured, the cost can be effectively controlled, the distance from the ground can be ensured, and the lightweight control of the vehicle 100 can be facilitated.

[0044] In some embodiments, the density ρ of the metal plate 12 2 is 2.7g / cm 3 ~8.5g / cm 3 The range is.

[0045] Specifically, the density ρ of the metal plate 12 2 is 2.7g / cm 3 , 3.1g / cm 3 , 3.5g / cm 3 , 4.2g / cm 3 , 4.8g / cm3 , 5.3g / cm 3 , 5.7g / cm 3 , 6.0g / cm 3 , 6.7g / cm 3 , 7.5g / cm 3 , 7.6g / cm 3 , 7.8g / cm 3 , 8.0g / cm 3 , 8.1g / cm 3 , 8.2g / cm 3 , 8.3g / cm 3 , 8.4g / cm 3 , 8.5g / cm 3 etc.

[0046] Density ρ of metal plate 12 2 can be adjusted by selecting the material and specific model of the metal plate 12, and is related to the weight and mechanical strength of the metal plate 12. 2 When the thickness is within the above range, the metal plate has good mechanical strength, which is beneficial for controlling the weight of the vehicle 100.

[0047] In some embodiments, the density ρ of the upper fiber-reinforced resin layer 11 3 is 1.3g / cm 3 ~1.9g / cm 3 and the density ρ of the lower fiber-reinforced resin layer 14 is in the range 1 is 1.3g / cm 3 ~1.9g / cm 3 The range is.

[0048] Specifically, the density ρ of the upper fiber reinforced resin layer 11 3 and the density ρ of the lower fiber-reinforced resin layer 14 1 are each independently 1.3 g / cm 3 , 1.4g / cm 3 , 1.5g / cm 3 , 1.6g / cm 3 , 1.7g / cm 3 , 1.8g / cm 3 , 1.9g / cm 3 and the like.

[0049] Density ρ of the upper fiber-reinforced resin layer 11 3 and the density ρ of the lower fiber-reinforced resin layer 14 1 is related to the resin and reinforcing fiber materials selected and is affected by the reinforcing fiber content. 3 and the density ρ of the lower fiber-reinforced resin layer 14 1 When the thickness of the upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14 are in the above range, the reinforcing fibers are sufficiently present, which is beneficial for improving the tensile strength of the upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14.

[0050] In some embodiments, the tensile strength σ of the metal plate 12 2 is in the range of 590MPa to 1180MPa.

[0051] Specifically, the tensile strength σ of the metal plate 12 2 can be 590 MPa, 600 MPa, 650 MPa, 700 MPa, 750 MPa, 800 MPa, 850 MPa, 900 MPa, 950 MPa, 1000 MPa, 1180 MPa, etc.

[0052] Tensile strength σ of metal plate 12 2 can be tested according to GB / T 228.1-2010 Metallic materials---Tensile testing---Part 1: Method of test at room temperature. Tensile strength σ 2 If the tensile strength σ of the metal plate 12 is higher, the metal plate 12 can withstand a higher impact without irreversible deformation. 2 The higher the tensile strength σ of the metal plate 12, the lower the breaking elongation. 2 When it is within the above range, the impact strength and crack resistance of the metal plate 12 can be effectively ensured.

[0053] In some embodiments, the tensile strength σ of the upper fiber-reinforced resin layer 11 3 is in the range of 240 MPa to 380 MPa, and the tensile strength σ 1is in the range of 240MPa to 380MPa.

[0054] Specifically, the tensile strength σ of the upper fiber reinforced resin layer 11 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 may each independently be selected from 240 MPa, 280 MPa, 290 MPa, 300 MPa, 310 MPa, 320 MPa, 330 MPa, 340 MPa, 350 MPa, 360 MPa, 370 MPa, 380 MPa, and the like.

[0055] Tensile strength σ of upper fiber-reinforced resin layer 11 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 can be tested according to GB / T 1447-2005 Fiber-reinforced plastics composites---Determination of tensile properties. Type I samples are suitable for fiber-reinforced thermoplastic plates, and the samples are manufactured according to the Type I samples specified in the national standard for testing. The tensile strength σ of the upper fiber-reinforced resin layer 11 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 Improving the tensile strength σ of the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14 is beneficial for increasing the deformation resistance of the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14. However, 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 When the tensile strength σ of the upper fiber reinforced resin layer 11 is increased, the adhesion of the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14 to the metal plate 12 is affected, and impact peeling may occur. 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 When is within the above range, the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14 can effectively withstand an external impact without peeling off or falling off.

[0056] The above nine parameters are interrelated and inseparable from the viewpoint of improving the battery pack 3 to avoid delamination and resist rivet fatigue damage. For example, the thickness d 3 , thickness d of metal plate 12 2 , or the thickness d of the lower fiber-reinforced resin layer 14 1 As the density ρ of the metal plate 12 increases, 2 , the density ρ of the upper fiber-reinforced resin layer 11 3 , or the density ρ of the lower fiber-reinforced resin layer 14 1 When the value of the tensile strength of the metal plate 12 is increased, the impact resistance of the battery protection bottom plate 1 is improved. 2 , the tensile strength σ of the upper fiber-reinforced resin layer 11 3 , and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 However, this leads to a corresponding increase in the total mass and thickness of the battery protection bottom plate 1, which is not beneficial to meet the lightweight requirement of the vehicle 100 and control the cost, and leads to a reduction in the minimum ground clearance of the vehicle 100. 2 As the tensile strength σ of the metal plate 12 increases, its deformation resistance increases, but the metal plate becomes more likely to break when deformed. 2 is the tensile strength σ of the upper fiber reinforced resin layer 11 3 and the tensile strength σ of the lower fiber-reinforced resin layer 14 1 If the temperature and humidity are not sufficiently consistent, asynchronous vibrations are likely to occur, which makes peeling more likely to occur. Therefore, the influence of each factor on the protection performance and vibration isolation performance of the battery pack 3 is

number

[0057] As shown in FIG. 1, in some embodiments, the battery protection bottom plate 1 further includes a fiber reinforced resin frame 13. The metal plate 12 and the fiber reinforced resin frame 13 are located between the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14. The metal plate 12 is located inside the fiber reinforced resin frame 13. The top surface of the fiber reinforced resin frame 13 is integrally connected to the upper fiber reinforced resin layer 11, and the bottom surface of the fiber reinforced resin frame 13 is integrally connected to the lower fiber reinforced resin layer 14.

[0058] The fiber reinforced resin frame 13 is disposed around the metal plate 12 as a frame connection transition member for the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14. This can effectively offset the influence of the thickness of the metal plate 12 on the frame connection between the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14, ensure the strength of the frame of the battery protection bottom plate 1, make it easier to use the frame of the battery protection bottom plate 1 as the mounting structure of the battery protection bottom plate to the battery, and improve the impact resistance of the battery protection bottom plate.

[0059] As shown in FIG. 5, in some embodiments, a plurality of mounting holes 15 are spaced apart inside the edge of the battery protection bottom plate 1, and the mounting holes 15 pass through the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13, and the lower fiber reinforced resin layer 14 in that order.

[0060] The mounting holes 15 are configured to mount and fasten the battery protection bottom plate 1 to the bottom of the battery pack 3. The mounting holes 15 are provided on the inside of the edge of the battery protection bottom plate 1, and penetrate the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13, and the lower fiber reinforced resin layer 14 in order, which can prevent the mounting holes 15 from penetrating the metal plate 12 and avoid the corrosion problem caused by the exposure of the metal plate 12 at the mounting holes 15. In addition, the fiber reinforced resin frame 13 is beneficial to improving the overall thickness and tensile shear strength of the mounting position, and has sufficient mounting stability.

[0061] A plurality of mounting holes 15 are provided around the periphery of the metal plate 12 to evenly distribute top gravity and bottom impact forces on the metal plate 12 .

[0062] Specifically, a connecting member is provided for passing through the mounting hole 15 during mounting to fix the battery protection bottom plate 1 to the bottom of the battery pack 3. The connecting member is a rivet, a screw, or a bolt.

[0063] In different embodiments, the resins of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are each independently selected from thermosetting and / or thermoplastic materials. Examples may include, but are not limited to, epoxy resins, phenolic plastics, phenols, cyanate esters, imides (e.g., polyimides, bismaleimides (BMI), and polyetherimides), polypropylenes, polyesters, benzoxazines, polybenzimidazoles, polybenzothiazoles, polyamides, polyamideimides, polysulfones, polyethersulfones, polycarbonates, polyethylene terephthalates, and polyetherketones (e.g., polyetherketones (PEK), polyetheretherketones (PEEK), and polyetherketoneketones (PEKK)), and combinations thereof.

[0064] In different embodiments, the fibers of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are each independently selected from glass fibers, aramid fibers, carbon fibers, graphite fibers, boron fibers, aromatic polyamide fibers, and mixtures thereof.

[0065] The fibers of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 may be embedded in the resin in the form of chopped fibers, long cut fibers, nonwoven fabric, unidirectional reinforcing fiber substrate, woven fabric, etc.

[0066] In some embodiments, the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are each independently selected from a glass fiber reinforced polyamide resin member or a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

[0067] In some embodiments, the fiber-reinforced resin layer, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are made of the same resin material, which can ensure the material affinity between different layers, thereby ensuring the degree of integration of the combination between different layers and improving the overall strength.

[0068] In some embodiments, the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13, and the lower fiber reinforced resin layer 14 are each glass fiber reinforced resin members, and the glass fiber reinforced resin members contain glass fiber at a content in the range of 50% to 70%, which is beneficial for improving the material strength of the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13, and the lower fiber reinforced resin layer 14.

[0069] In some embodiments, the alkali content of the glass fibers is less than 0.8%.

[0070] When the alkali content of the glass fiber is less than 0.8%, the aging resistance of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 is improved, and the performance degradation of the materials after long-term use is slowed down.

[0071] In some embodiments, the glass fibers are selected from E-glass fibers or S-glass fibers.

[0072] In some embodiments, the upper fiber reinforced resin layer 11 comprises multiple layers of a first fiber reinforced prepreg laminated together, the fiber reinforced resin frame 13 comprises multiple layers of a second fiber reinforced prepreg laminated together, and the lower fiber reinforced resin layer 14 comprises multiple layers of a third fiber reinforced prepreg laminated together.

[0073] 2, the upper fiber reinforced resin layer 11 includes a plurality of layers of first fiber reinforced prepreg unidirectional tapes 111 laminated together. The fiber arrangement directions of two adjacent layers of the first fiber reinforced prepreg unidirectional tapes 111 are offset by about 90°, and the allowable ply angle deviation range of the two adjacent layers of the first fiber reinforced prepreg unidirectional tapes 111 is ±20°.

[0074] The fibers of each first fiber reinforced prepreg unidirectional tape 111 are arranged in one direction, and when tension is applied along the fiber stretching direction, the fibers of the first fiber reinforced prepreg unidirectional tape 111 can effectively withstand the tension. By shifting the fiber arrangement directions of adjacent first fiber reinforced prepreg unidirectional tapes by about 90°, the stress uniformity of the upper fiber reinforced resin layer 11 in each direction is improved.

[0075] The fiber reinforced resin frame 13 includes a plurality of layers of second fiber reinforced prepreg unidirectional tapes stacked together. The fibers of each second fiber reinforced prepreg unidirectional tape are arranged in one direction. The fiber arrangement directions of two adjacent layers of the second fiber reinforced prepreg unidirectional tape are offset by about 90°, and the allowable ply angle deviation range of two adjacent layers of the second fiber reinforced prepreg unidirectional tape is ±20°.

[0076] The lower fiber reinforced resin layer 14 includes a plurality of layers of third fiber reinforced prepreg unidirectional tapes laminated together. The fibers of each third fiber reinforced prepreg unidirectional tape are arranged in one direction. The fiber arrangement directions of two adjacent layers of the third fiber reinforced prepreg unidirectional tape are offset by about 90°, and the allowable ply angle deviation range of two adjacent layers of the third fiber reinforced prepreg unidirectional tape is ±20°.

[0077] The fiber arrangement of the fiber reinforced resin frame 13 and the lower fiber reinforced resin layer 14 is similar to that of the upper fiber reinforced resin layer 11, and the details will not be repeated.

[0078] As shown in FIG. 3, in another embodiment, the upper fiber-reinforced resin layer 11 includes multiple layers of first fiber-fabric reinforced prepregs 112 laminated together, with the fibers of each first fiber-fabric reinforced prepreg 112 forming a staggered fabric.

[0079] The fibre reinforced resin frame 13 includes a plurality of layers of second fibre fabric reinforced prepregs laminated together, the fibres of each second fibre fabric reinforced prepreg forming a staggered weave.

[0080] The lower fiber reinforced resin layer 14 includes a plurality of layers of third fiber fabric reinforced prepregs laminated together, with the fibers of each third fiber fabric reinforced prepreg forming a staggered fabric.

[0081] In some embodiments, metal plate 12 is selected from iron and its alloys, aluminum and its alloys, magnesium and its alloys, copper and its alloys, titanium and its alloys, or nickel and its alloys.

[0082] In some embodiments, metal sheet 12 is a steel sheet, and a zinc-plated layer, a zinc-plated iron alloy layer, or an electrophoretic paint protective layer is disposed on the outer surface of the steel sheet.

[0083] Compared with other metal materials, the steel plate used as the metal plate 12 has better tensile strength and elongation, can meet the requirements of impact resistance, and is beneficial to improving the protective effect for the battery pack 3.

[0084] The zinc-plated layer, zinc-plated iron alloy layer, or electrophoretic paint protective layer is disposed on the outer surface of the steel plate to improve the corrosion resistance of the steel plate. When the upper fiber-reinforced resin layer 11 or the lower fiber-reinforced resin layer 14 is damaged, the zinc-plated layer or zinc-plated iron alloy layer corrodes before the steel plate due to the galvanic effect formed by the zinc-plated layer or zinc-plated iron alloy layer and the steel plate, thereby providing a protective effect for the steel plate. The electrophoretic paint protective layer has good adhesion and can effectively isolate the steel plate from the external environment.

[0085] 4, another embodiment of the present disclosure provides a battery pack composite protection structure 10, including the above-mentioned battery pack 3 and a battery protection bottom plate 1. The battery protection bottom plate 1 is disposed below the battery pack 3, and a buffer area 4 is formed between the battery pack 3 and the battery protection bottom plate 1.

[0086] By adopting the above-mentioned battery protection bottom plate 1, the battery pack composite protective structure 10 effectively ensures the protective strength of the battery protection bottom plate 1 and the stable connection of the battery protection bottom plate 1 to the battery pack 3 while ensuring a thinner overall thickness.

[0087] In some embodiments, the battery pack 3 includes a tray 31 and a battery disposed on the tray 31 .

[0088] In different embodiments, the buffer area 4 may be provided between the battery pack 3 and the battery protection bottom plate 1 in different ways.

[0089] 6, in one embodiment, a groove is provided inward on the bottom surface of the tray 31 to form a buffer area 4, and the battery protection bottom plate 1 has a flat plate shape. The battery protection bottom plate 1 covers the buffer area 4.

[0090] 7, in one embodiment, the frame of the battery protection bottom plate 1 is connected to the bottom surface of the tray 31, and a groove is provided inside the bottom surface of the tray 31. The battery protection bottom plate 1 protrudes away from the tray 31, forming a buffer area 4 between the tray 31 and the battery protection bottom plate 1.

[0091] 8, in one embodiment, the frame of the battery protection bottom plate 1 is connected to the bottom surface of the tray 31, and the bottom surface of the tray 31 is a flat surface. The battery protection bottom plate 1 protrudes away from the tray 31 to form a buffer area 4 between the tray 31 and the battery protection bottom plate 1.

[0092] In some embodiments, the buffer region 4 is filled with a buffer layer 2, which is selected from a honeycomb material or a rigid foam material.

[0093] The honeycomb material or hard foam material can absorb the crushing deformation space of the battery protection bottom plate 1 under strong external impact, cushion and absorb part of the energy of the strong external impact, prevent the compression deformation of the battery protection bottom plate 1 from impacting the internal battery core of the battery pack 3, and thereby further protect the battery pack 3.

[0094] In some embodiments, the honeycomb material is selected from a PP honeycomb material or an aluminum honeycomb material, and the rigid foam material is selected from a PU rigid foam material, a PET rigid foam material, a PMI rigid foam material, a PVC rigid foam material, a PET rigid foam material, a MPP rigid foam material, a PLA rigid foam material, a PI rigid foam material, or an EPTU rigid foam material.

[0095] Another embodiment of the present disclosure provides a vehicle 100, as shown in FIG. 9, including a battery protection bottom plate 1 or a battery pack composite protection structure 10 as described above.

[0096] The present disclosure will now be further described with reference to examples. The formula in Table 1 below is

number

[0097] Example 1 This embodiment is used to describe a battery pack composite protection structure according to the present disclosure, which includes a battery pack, a buffer layer, and a battery protection bottom plate. The battery protection bottom plate includes a metal plate, an upper fiber reinforced resin layer, a fiber reinforced resin frame, and a lower fiber reinforced resin layer. The metal plate is a galvanized steel plate. The metal plate is located between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer. The metal plate is located inside the fiber reinforced resin frame. The upper surface of the fiber reinforced resin frame is integrally connected to the upper fiber reinforced resin layer, and the bottom surface of the fiber reinforced resin frame is integrally connected to the lower fiber reinforced resin layer. The battery protection bottom plate is disposed below the battery pack, and a buffer area is formed between the battery pack and the battery protection bottom plate. The buffer area is filled with a buffer layer, and the frame of the battery protection bottom plate is attached to the bottom frame of the battery pack by a rivet.

[0098] Thickness of the upper fiber-reinforced resin layer d 3 The thickness of the lower fiber-reinforced resin layer d is 1.6 mm. 1 is 1.6 mm. The thickness of the metal plate, d 2 The density of the metal plate is ρ 2 is 7.9g / cm 3 The density of the upper fiber-reinforced resin layer is ρ 3 is 1.7g / cm 3 The density of the lower fiber-reinforced resin layer is ρ 1 is 1.7g / cm 3 The tensile strength of the metal plate is σ 2 The tensile strength of the upper fiber-reinforced resin layer is 780 MPa. 3 The tensile strength of the lower fiber-reinforced resin layer is 360 MPa. 1 is 360MPa.

[0099] Examples 2 to 27 Examples 2 to 27 are used to explain a battery pack composite protective structure according to the present disclosure, which includes most of the structure of Example 1 but differs in the following respects.

[0100] The upper fiber-reinforced resin layer, metal plate, and lower fiber-reinforced resin layer provided in each of Examples 2-27 in Table 1 are used.

[0101] Comparison 1-7 Comparative Examples 1 to 7 are used to comparatively explain the battery pack composite protective structure according to the present disclosure, which includes most of the structure of Example 1 but differs in the following points.

[0102] The upper fiber-reinforced resin layer, the metal plate, and the lower fiber-reinforced resin layer provided in each of Comparative Examples 1 to 7 in Table 1 are used.

[0103] Performance Testing The performance of the composite protective structures for battery packs according to the above-mentioned examples and comparative examples was tested as follows.

[0104] 1. To simulate the working conditions in which the bottom of the entire vehicle is impacted by a foreign object, a ball was used as the impact head to impact the battery protection bottom plate of each battery pack composite protection structure. The ball had a diameter of 25 mm, a weight of 10 kg, an impact energy of 300 J, and an impact speed of 8.5 m / s. The center point of the battery protection bottom plate and four points around the center point were selected as the impact points to deliver five impacts.

[0105] The amount of dent deformation of the battery pack tray at each impact point was measured, and the impact point with the maximum amount of dent deformation was selected and indicated as the amount of dent deformation of the battery pack tray. In general, the amount of dent caused by an energy impact of 300 J must be 3 mm or less.

[0106] 2. The battery pack composite protective structure was attached to a vibration table and subjected to a 30W mileage simulation vibration. The rivet attachment condition after vibration and whether the battery protection bottom plate had peeled off were confirmed. 30w mileage simulation vibration test: According to the requirements of GB / T 2423.43, the test object was mounted on a vibration table, and the torque at each mounting point was tested and recorded. The vibration test was carried out in three directions. For the test process, please refer to GB / T 2423.56, and the specific test conditions are as follows:

[0107] First, random vibration was performed in the Z direction for 21 hours (under the random vibration conditions shown in Table 2), and then vibration was performed in the Z direction for 1 hour at a fixed frequency (fixed frequency vibration conditions: fixed frequency 24 Hz, fixed frequency amplitude 1 g).

[0108] Next, random vibration was performed in the Y direction for 21 hours (under the random vibration conditions shown in Table 2), and then vibration was performed in the Y direction for 1 hour at a constant frequency (fixed frequency vibration conditions: fixed frequency 24 Hz, fixed frequency amplitude 1 g).

[0109] Furthermore, random vibration was performed in the X direction for 21 hours (under the random vibration conditions shown in Table 2), and then vibration was performed in the X direction for 1 hour at a constant frequency (fixed frequency vibration conditions: fixed frequency 24 Hz, fixed frequency amplitude 1 g).

[0110] PSD stands for power spectral density, which represents the power spectral density of vibration at a certain frequency. The rms value represents the total acceleration of the vibration, which provides feedback on the vibration strength. [Table 2]

[0111] The test results obtained are shown in Table 3. [Table 3]

[0112] As can be seen from the test results in Table 3, the thickness d 3 , the thickness of the lower fiber-reinforced resin layer d 1 , thickness of metal plate d 2 , density of metal plate ρ 2 , density of the upper fiber-reinforced resin layer ρ 3 , density of the lower fiber-reinforced resin layer ρ 1 , tensile strength of metal plate σ 2 , tensile strength of the upper fiber-reinforced resin layer σ 3 , and the tensile strength of the lower fiber-reinforced resin layer σ 1have interrelated effects on improving the impact resistance of the battery pack and the mounting stability of the battery protection bottom plate. When they are met, the resulting battery pack composite protection structure can meet the application requirements under long-term impact conditions.

[0113] The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure. [Explanation of symbols]

[0114] 100 vehicles 10 Battery pack composite protective structure 1 Battery protection bottom plate 11 Upper fiber-reinforced resin layer 110 First fiber reinforced prepreg 111 First fiber reinforced prepreg unidirectional tape 112 First fiber woven reinforced prepreg 12 metal plate 13 Fiber-reinforced resin frame 14 Lower fiber-reinforced resin layer 15 Mounting hole 2 Buffer layer 3 Battery pack 31 Tray 4 Buffer area

Claims

1. The present invention relates to a composite material having an upper fiber-reinforced resin layer (11), a metal plate (12), and a lower fiber-reinforced resin layer (14), wherein the metal plate (12) is located between the upper fiber-reinforced resin layer (11) and the lower fiber-reinforced resin layer (14), and the metal plate (12), the upper fiber-reinforced resin layer (11), and the lower fiber-reinforced resin layer (14) satisfy the following conditions: [0010] In the formula, d １ is the thickness of the lower fiber-reinforced resin layer (14) in mm, and d ２ is the thickness of the metal plate (12) in mm, and d ３ is the thickness of the upper fiber-reinforced resin layer (11) in mm, and ρ １ is g / cm ３ is the density of the lower fiber-reinforced resin layer (14) in units of ２ is g / cm ３ is the density of the metal plate (12) in units, and ρ ３ is g / cm ３ is the density of the upper fiber-reinforced resin layer (11) in units of １ is the tensile strength of the lower fiber-reinforced resin layer (14) in MPa, and σ ２ is the tensile strength of the metal plate (12) in MPa, and σ ３ is the tensile strength of the upper fiber reinforced resin layer (11) in MPa; The battery protection bottom plate (1) meets the above requirements.

2. The metal plate (12), the upper fiber-reinforced resin layer (11), and the lower fiber-reinforced resin layer (14) are formed under the following conditions: [0025] The battery protective bottom plate (1) according to claim 1,

3. The thickness d of the upper fiber reinforced resin layer (11) ３ is in the range of 0.4 mm to 1.6 mm, and the thickness d １ The battery protective sole plate (1) according to claim 1 or 2, wherein the thickness is in the range of 0.6 mm to 2 mm.

4. The thickness d of the metal plate (12) ２ The battery protective sole plate (1) according to any one of claims 1 to 3, wherein the thickness of the protective sole plate (1) is in the range of 0.7 mm to 1.6 mm.

5. The density ρ of the metal plate (12) ２ , but 2.7 g / cm ３ ~8.5g / cm ３ The battery protective sole plate (1) according to any one of claims 1 to 4, wherein

6. The density ρ of the upper fiber reinforced resin layer (11) ３ , but 1.3 g / cm ３ ~1.9g / cm ３ and the density ρ of the lower fiber reinforced resin layer (14) is in the range of １ , but 1.3 g / cm ３ ~1.9g / cm ３ 6. The battery protective sole plate (1) according to any one of claims 1 to 5, wherein

7. The tensile strength σ of the metal plate (12) ２ The battery protective sole plate (1) according to any one of claims 1 to 6, wherein the stress is in the range of 590 MPa to 1180 MPa.

8. The tensile strength σ of the upper fiber reinforced resin layer (11) ３ is in the range of 240 MPa to 380 MPa, and the tensile strength σ of the lower fiber reinforced resin layer (14) １ The battery protective sole plate (1) according to any one of claims 1 to 7, wherein the stress is in the range of 240 MPa to 380 MPa.

9. 9. The battery protection bottom plate (1) according to claim 1, further comprising a fiber-reinforced resin frame (13), wherein the metal plate (12) and the fiber-reinforced resin frame (13) are positioned between the upper fiber-reinforced resin layer (11) and the lower fiber-reinforced resin layer (14), the metal plate (12) is positioned inside the fiber-reinforced resin frame (13), an upper surface of the fiber-reinforced resin frame (13) is integrally connected to the upper fiber-reinforced resin layer (11), and a bottom surface of the fiber-reinforced resin frame (13) is integrally connected to the lower fiber-reinforced resin layer (14).

10. 10. The battery protection base plate (1) of claim 9, wherein a plurality of mounting holes (15) are spaced apart on the inside of the edge of the battery protection base plate (1), and the mounting holes (15) pass through the upper fiber-reinforced resin layer (11), the fiber-reinforced resin frame (13), and the lower fiber-reinforced resin layer (14) in that order.

11. 11. The battery protective bottom plate (1) according to claim 9 or 10, wherein the upper fiber-reinforced resin layer (11), the fiber-reinforced resin frame (13), and the lower fiber-reinforced resin layer (14) are each independently selected from a glass fiber-reinforced polyamide resin member, a glass fiber-reinforced polypropylene resin member, a glass fiber-reinforced polyethylene resin member, a glass fiber-reinforced polycarbonate resin member, or a glass fiber-reinforced polystyrene resin member.

12. The battery protective bottom plate (1) according to any one of claims 9 to 11, wherein the upper fiber-reinforced resin layer (11), the fiber-reinforced resin frame (13), and the lower fiber-reinforced resin layer (14) are each a glass fiber-reinforced resin member, the glass fiber-reinforced resin member contains glass fiber at a content in the range of 50% to 70%, and the glass fiber has an alkali content of less than 0.8%.

13. The upper fiber-reinforced resin layer (11) comprises a plurality of layers of a first fiber-reinforced prepreg (110) laminated together, The fiber-reinforced resin frame (13) comprises a plurality of layers of a second fiber-reinforced prepreg laminated together, 13. The battery protective soleplate (1) according to any one of claims 9 to 12, wherein the lower fibre reinforced resin layer (14) comprises a plurality of layers of a third fibre reinforced prepreg laminated together.

14. 14. The battery protection bottom plate (1) according to any one of claims 1 to 13, wherein the metal plate (12) is a steel plate, and a zinc-plated layer, a zinc-plated iron alloy layer, or an electrophoretic paint protection layer is disposed on the outer surface of the steel plate.

15. A battery pack composite protective structure (10) comprising a battery pack (3) and a battery protective bottom plate (1) according to any one of claims 1 to 14, the battery protective bottom plate (1) being disposed below the battery pack (3), and a buffer area (4) being formed between the battery pack (3) and the battery protective bottom plate (1).

16. 16. The battery pack composite protective structure (10) according to claim 15, wherein the buffer area (4) is filled with a buffer layer (2), and the buffer layer (2) is selected from a honeycomb material or a rigid foam material.

17. A vehicle comprising a battery protection base plate (1) according to any one of claims 1 to 14 or a battery pack composite protection structure (10) according to claim 15 or 16.

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