Cover plate assembly, battery assembly and vehicle

Abstract

The invention discloses a cover plate assembly, a battery assembly and a vehicle. The cover plate assembly comprises a base plate, a sealing plate and a reinforcing plate, one side of the base plate is suitable for being connected with a shell of the battery assembly, the other side of the base plate is suitable for being connected with a vehicle body frame to form at least part of a floor of a vehicle, the reinforcing plate is arranged on the side, facing the vehicle body frame, of the base plate, and at least part of the reinforcing plate is suitable for covering a pedal area of a vehicle passenger compartment; the cover plate assembly meets the following conditions: 12 < = ln (rho 2 * d2 * sigma2 / ln (rho 1 * d1 * sigma1)) < = 13; wherein the density of the base plate is rho1, the tensile strength of the base plate is sigma 1, and the thickness of the base plate is d1; the density of the reinforcing plate is rho2, the tensile strength of the reinforcing plate is sigma 2, and the thickness of the reinforcing plate is d2. Thus, by means of the performance design of the base plate and the reinforcing plate and the arrangement of the reinforcing plate in the pedal area of the passenger compartment, the requirement for deformation of the cover plate assembly is met while excessive design is avoided, and therefore the purposes of vehicle light weight and structural strength are achieved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to a cover plate assembly, a battery assembly and a vehicle. Background Art

[0002] New energy vehicles (NEVs) are those powered by unconventional fuels, such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and extended-range electric vehicles. Their electricity is primarily stored in battery packs. Given current battery pack energy density and vehicle range requirements, battery packs typically weigh several hundred kilograms. The addition of battery packs inevitably increases the vehicle's overall mass, requiring further refinement of the existing vehicle structure.

[0003] Related technologies use CTC (Cell to Chassis) technology to integrate battery modules into the vehicle chassis. However, the integration of battery modules and vehicles using CTC technology is still not high enough, and cannot meet the requirements of vehicle lightweighting and structural strength. Summary of the Invention

[0004] The present application aims to provide a cover plate assembly, a battery assembly and a vehicle, which can solve the problem in the prior art that the integration of the battery assembly is not high and cannot take into account both the lightweight and structural strength of the vehicle.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a cover plate assembly, comprising: a base plate, a sealing plate, and a reinforcement plate; one side of the base plate is adapted to be connected to a battery assembly housing, and the other side of the base plate is adapted to be connected to a vehicle body frame to form at least a portion of a vehicle floor; the reinforcement plate is provided on a side of the base plate facing the vehicle body frame, and is adapted to at least partially cover a footrest area of a vehicle passenger compartment; the cover plate assembly satisfies the following conditions: 12≤ln(ρ2×d2×σ2÷ln(ρ1×d1×σ1))≤13;

[0007] The density of the base plate is ρ1, the tensile strength of the base plate is σ1, and the thickness of the base plate is d1; the density of the reinforcing plate is ρ2, the tensile strength of the reinforcing plate is σ2, and the thickness of the reinforcing plate is d2.

[0008] Optionally, the density ρ1 of the base plate satisfies: 1800 kg / m 3 ≤ρ1≤2000kg / m 3 .

[0009] Optionally, the density ρ2 of the reinforcing plate satisfies: 2700 kg / m 3≤ρ2≤7850kg / m 3 .

[0010] Optionally, the tensile strength σ1 of the base plate satisfies: 250MPa≤σ1≤350MPa.

[0011] Optionally, the tensile strength σ2 of the reinforcing plate satisfies: 310 MPa≤σ2≤980 MPa.

[0012] Optionally, the thickness d1 of the base plate satisfies: 0.4 mm ≤ d1 ≤ 0.8 mm; and / or the thickness d2 of the reinforcement plate satisfies: 0.6 mm ≤ d2 ≤ 2.5 mm.

[0013] Optionally, a sealing plate is further included; the sealing plate is arranged on the side of the base plate facing the vehicle body frame, a hollow portion is provided in the sealing plate, and the reinforcing plate is arranged in the hollow portion.

[0014] Optionally, the thickness of the sealing plate is d3, satisfying: 0≤|d3-d2|≤2mm.

[0015] Optionally, the number of the hollow portions is multiple, and the multiple hollow portions are arranged at intervals.

[0016] Optionally, the base plate is provided with a plurality of through holes; the plurality of through holes are arranged at intervals at the circumferential edge of the base plate, and the through holes pass through the sealing plate.

[0017] Optionally, the distance between two adjacent through holes is 60 mm-100 mm; and / or the aperture of the through hole is 6.5 mm-8 mm.

[0018] Optionally, the base plate is made of a composite material; the composite material includes: 30wt%-50wt% of resin and 50wt%-70wt% of glass fiber.

[0019] In a second aspect, an embodiment of the present application proposes a battery assembly, comprising a cover plate assembly as described in any one of the above embodiments.

[0020] Optionally, it further includes a shell and a battery cell, wherein the shell is provided with a receiving cavity, the battery cell is arranged in the receiving cavity, and the cover plate assembly is sealed on the cavity opening of the receiving cavity.

[0021] In a third aspect, an embodiment of the present application proposes a vehicle, comprising a cover plate assembly as described in any one of the above embodiments; or, comprising a battery assembly as described in the above embodiments.

[0022] In an embodiment of the present application, a base plate is connected to the battery assembly housing on one side and to the vehicle body frame on the other side to form at least a portion of the vehicle's floor. A reinforcement plate is provided on the side of the base plate facing the vehicle body frame, and the reinforcement plate at least partially covers the footrest area of the vehicle's passenger compartment. The cover plate assembly satisfies the following equation: 12 ≤ ln(ρ2 × d2 × σ2 ÷ ln(ρ1 × d1 × σ1)) ≤ 13. Thus, by designing the performance of the base plate and reinforcement plate, and providing the reinforcement plate in the passenger compartment footrest area, the deformation requirements of the cover plate assembly can be met, preventing damage to the cells within the battery assembly housing that could lead to leakage. Furthermore, overdesign can be avoided, resulting in excessive weight that fails to meet the minimum energy density requirements of the battery assembly, thereby achieving a balance between vehicle lightweighting and structural strength. Furthermore, the cover plate assembly can be connected to the battery assembly housing to seal the battery assembly, and can also be connected to the vehicle body frame to form at least a portion of the vehicle's floor, improving the integration of the battery assembly into the vehicle.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic diagram of the connection between the cover assembly and the vehicle body frame according to an embodiment of the present application;

[0026] Figure 2 is a top view of a cover plate assembly according to an embodiment of the present application;

[0027] Figure 3 is an exploded view of a cover assembly according to an embodiment of the present application.

[0028] Reference numerals:

[0029] 1-cover plate assembly; 2-shell; 3-body frame; 4-base plate; 5-sealing plate; 6-reinforcement plate; 7-hollow portion; 8-through hole; 9-seal; 10-seat; 11-seat crossbeam. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] Below, in conjunction with the accompanying drawings, the cover plate assembly, battery assembly and vehicle provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0035] like Figures 1 to 3As shown, a cover plate assembly 1 according to some embodiments of the present application includes: a base plate 4, a sealing plate 5, and a reinforcement plate 6; one side of the base plate 4 is adapted to be connected to the battery assembly housing 2 of the battery assembly, and the other side of the base plate 4 is adapted to be connected to the vehicle body frame 3 to form at least a portion of the floor of the vehicle, and the reinforcement plate 6 is provided on a side of the base plate 4 facing the vehicle body frame, and the reinforcement plate 6 is adapted to at least partially cover the footrest area of the vehicle passenger compartment;

[0036] The cover plate assembly satisfies the following formula: 12≤ln(ρ2×d2×σ2÷ln(ρ1×d1×σ1))≤13; wherein, the density of the base plate 4 is ρ1, the tensile strength of the base plate 4 is σ1, and the thickness of the base plate 4 is d1; the density of the reinforcing plate 6 is ρ2, the tensile strength of the reinforcing plate 6 is σ2, and the thickness of the reinforcing plate 6 is d2.

[0037] In this embodiment, a base plate 4 is connected to the battery assembly housing 2 on one side and to the vehicle body frame 3 on the other side to form at least a portion of the vehicle's floor. A reinforcement plate 6 is provided on the side of the base plate 4 facing the vehicle body frame. The reinforcement plate 6 at least partially covers the footrest area of the vehicle's passenger compartment. Furthermore, the cover plate assembly is configured to satisfy the condition 12 ≤ ln(ρ2 × d2 × σ2 ÷ ln(ρ1 × d1 × σ1)) ≤ 13. Thus, by designing the performance of the base plate 4 and reinforcement plate 6, and providing the reinforcement plate 6 in the passenger compartment footrest area, the deformation requirements of the cover plate assembly 1 are met, preventing damage to the cells within the battery assembly housing 2, which could lead to leakage. Furthermore, overdesign, which could result in excessive weight that fails to meet the minimum energy density requirements of the battery assembly, is avoided, thereby achieving a balance between vehicle lightweighting and structural strength. Furthermore, the cover plate assembly 1 can be connected to the battery assembly housing 2 to seal the battery assembly, and can also be connected to the vehicle body frame 3 to form at least a portion of the vehicle's floor, improving the integration of the battery assembly into the vehicle.

[0038] Specifically, if Figure 1 As shown, the floor refers to a component located inside the vehicle, which is mainly used to support seats 10, seat crossbars 11, and passengers stepping on the passenger compartment and heavy objects falling from it, while also bearing the loads, vibrations, impacts, and torque generated during vehicle movement. When the battery assembly is integrated on the floor of the vehicle, the floors in different areas have different functional requirements. The part of the floor formed by the cover assembly 1 is mainly used to support passengers stepping on the passenger compartment and heavy objects falling from it. A reinforcing plate 6 is provided in the area corresponding to the area touched by the feet of passengers in the passenger compartment to prevent deformation of the cover assembly 1 caused by passengers stepping on the passenger compartment and heavy objects falling from it. It is understandable that the area of the reinforcing plate 6 needs to cover the area that can be touched by the feet of passengers in the passenger compartment.

[0039] In some embodiments, as Figure 1 As shown, the vehicle has a main driver's seat, a co-pilot seat and a back row of seats, and the passenger compartment includes the main driver's seat, the co-pilot seat and the back row of seats. A reinforcing plate 6 can be set in the footrest area corresponding to the main driver's seat and the co-pilot seat, and a reinforcing plate 6 can also be set in the footrest area corresponding to the back row of seats.

[0040] In other embodiments, the cover plate assembly 1 is divided into different functional components, specifically: the base plate 4 is primarily used to seal the battery assembly housing 2 of the battery assembly and to form part of the vehicle floor; the sealing plate 5 is used to seal the battery assembly housing 2 of the battery assembly and the base plate 4; and the reinforcing plate 6 is used to strengthen the structural strength of a portion of the cover plate assembly 1 to resist occupants stepping on it and heavy objects falling. This application designs a solution based on functional requirements, while meeting the structural strength of the cover plate assembly 1 while reducing the cost and weight of the cover plate assembly 1.

[0041] In other embodiments, the base plate 4 can be a continuous, unspliced, complete plate. The battery assembly housing 2 has a receiving cavity, and the area of the base plate 4 must completely cover the opening of the receiving cavity; this ensures the sealing performance and overall strength of the base plate 4. Similarly, the sealing plate 5 can be a continuous, unspliced, complete plate. This ensures the sealing performance and overall strength of the sealing plate 5. Furthermore, the outer contour of the sealing plate 5 must be consistent with that of the base plate 4 to facilitate installation of both.

[0042] In some embodiments, the base plate 4 can be made of a composite material, and the density ρ1 of the base plate 4 can be tested in accordance with GB / T 1033.1 Plastics—Determination of Density of Non-Cellular Plastics—Part 1. The reinforcement plate 6 can be made of a metal material, and the density ρ2 of the reinforcement plate 6 can be tested in accordance with ASTM B311 Standard Test Method for Density and Porosity of Rigid Mass Component Materials.

[0043] In some other embodiments, the tensile strength σ1 of the base plate 4 can be tested in accordance with ASTM D3039 Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials. The tensile strength σ2 of the reinforcement plate 6 can be tested in accordance with GB / T228.1 Tensile Test Methods for Metallic Materials.

[0044] In other embodiments, the energy density testing method of a battery assembly includes:

[0045] 1. At room temperature (25°C ± 2°C), discharge the battery to less than 3A at a current of not less than 1 / 3C and leave it for 30 minutes. C is the ratio of the charge and discharge current to the nominal capacity of the battery. 1C is equivalent to discharging the battery completely in 1 hour, and 1 / 3C is equivalent to discharging the battery completely in 3 hours.

[0046] 2. Charge the cells in the battery pack at a current of not less than 1 / 3C for 8 hours and let them rest for 30 minutes;

[0047] 3. Repeat step 1 to calculate the discharge energy E (in Wh);

[0048] 4. Repeat steps 2-3 several times and take the average value of the discharge energy E;

[0049] 5. Use an electronic scale to measure the overall mass M (in kg) of the battery assembly after discharge.

[0050] 6. Calculate the energy density of the battery assembly according to the energy density formula; where energy density (Wh / kg) = average discharge energy E / total mass M of the battery assembly.

[0051] In some further embodiments, the battery assembly is a vehicle-mounted battery assembly, and the deformation testing method of the vehicle-mounted battery assembly includes:

[0052] 1. Discharge or charge the cells in the battery assembly at a current of not less than 1 / 3C, and then leave them for a certain period of time.

[0053] 2. Measure the voltage and insulation resistance of the battery cells in the battery assembly to determine whether the battery cells in the battery assembly are normal; then take a photo of the appearance of the battery assembly.

[0054] 3. Connect the cells in the battery assembly to a computer, which records the voltage and temperature data of the cells in the battery assembly during the deformation test;

[0055] 4. The deformation test of the battery assembly uses the following parameters to impact the battery assembly:

[0056] ① Impact tooling: a hemispherical impact head of a certain diameter and mass;

[0057] ② Height of impact on battery assembly: Set the vertical distance between the upper surface of the cover assembly 1 in the battery assembly and the lower surface of the roof to L, and the hemispherical impact head is located at 2L / 3 from the upper surface of the cover assembly 1;

[0058] 5. After the impact test is completed, measure the insulation resistance of the battery cell and the depth of the indentation at the impact point in the cover assembly 1. The insulation resistance indicates whether the internal performance of the battery cell is normal; the depth of the indentation in the cover assembly 1 is used to indicate the deformation of the battery assembly.

[0059] It should be noted that when the deformation measured is ≤4mm, the test is considered passed; when the deformation measured is greater than 4mm, the test is considered unqualified. The minimum energy density of the battery assembly is set at 125Wh / kg. When the energy density measured is ≥125Wh / kg, the test is considered passed; when the energy density measured is less than 125Wh / kg, the test is considered unqualified.

[0060] It can be understood that A=ln(ρ2×d2×σ2÷ln(ρ1×d1×σ1)) formula (2) is set.

[0061] In some embodiments, cover plate assemblies of different specifications are selected to assemble into different battery assemblies, and the density ρ1, tensile strength σ1, thickness d1 of the base plate 4 and the density ρ2, tensile strength σ2, thickness d2 of the reinforcing plate 6 in the corresponding battery assembly are substituted into formula (2) to calculate different A values. The different battery assemblies are tested according to the above-mentioned deformation and energy density test methods. The specific test results are shown in Table 1 below.

[0062] Table 1: Test results of battery components

[0063]

[0064] As can be seen from the data in the above table, the A values in Comparative Examples 1 to 4 are all outside the range of 12-13. Although the deformation test results of the battery assemblies in Comparative Examples 1 to 4 are qualified, the minimum energy density test results are unqualified. In contrast, the A values in Comparative Examples 5 to 7 are all outside the range of 12-13. Although the minimum energy density test results of the battery assemblies in Comparative Examples 5 to 7 are qualified, the deformation test results are unqualified.

[0065] Further, as shown in Comparative Example 3 and Example 2, the density ρ2, tensile strength σ2, density ρ1, tensile strength σ1, and thickness d1 in Comparative Example 3 and the density ρ2, tensile strength σ2, density ρ1, tensile strength σ1, and thickness d1 in Example 2 are all the same. The difference is that the thickness d2 of the reinforcing plate 6 in Comparative Example 3 is greater than the thickness d2 of the reinforcing plate 6 in Example 2. Although the deformation test result of the battery assembly in Comparative Example 3 is qualified, it will affect the overall quality of the battery assembly, thereby causing the minimum energy density test result of the battery assembly to be unqualified; and the thickness d2 of the reinforcing plate 6 in Example 2 is moderate, so the minimum energy density test result and the deformation test result of the battery assembly in Example 4 are both qualified.

[0066] As shown in Comparative Example 6 and Example 2, the density ρ2, tensile strength σ2, density ρ1, tensile strength σ1, and thickness d1 in Comparative Example 6 are the same as those in Example 2. The difference is that the thickness d2 of the reinforcing plate 6 in Comparative Example 6 is smaller than the thickness d2 of the reinforcing plate 6 in Example 2. Although the battery assembly in Comparative Example 6 passed the minimum energy density test, the excessively small thickness d2 of the reinforcing plate 6 in Comparative Example 6 resulted in poor deformation resistance of the middle cover plate assembly 1 of the battery assembly, resulting in an unqualified deformation test result. In contrast, the thickness d2 of the reinforcing plate 6 in Example 2 was moderate, so the battery assembly in Example 5 passed both the minimum energy density test result and the deformation test result.

[0067] It should be noted that the values of A in Table 1 are rounded to two decimal places.

[0068] Optionally, the density ρ1 of the base plate 4 satisfies: 1800 kg / m 3 ≤ρ1≤2000kg / m 3 .

[0069] In the embodiment of the present application, the density ρ1 of the base plate 4 is set so as to meet the range requirements of formula (1), while avoiding the density ρ1 of the base plate 4 being too large to meet the minimum energy density requirements of the battery assembly and too small to meet the deformation requirements of the cover plate assembly 1.

[0070] For example, the density ρ1 of the base plate 4 can be set to: 1800 kg / m 3 、1850kg / m 3 、1900kg / m 3 、1950kg / m 3 , 2000kg / m 3 Any value or a range between any two values.

[0071] Optionally, the density ρ2 of the reinforcing plate 6 satisfies: 2700 kg / m 3 ≤ρ2≤7850kg / m 3 .

[0072] In the embodiment of the present application, by setting the density ρ2 of the reinforcing plate 6, the range requirements of formula (1) can be met, while avoiding the density ρ2 of the reinforcing plate 6 being too large, resulting in failure to meet the minimum energy density requirements of the battery assembly, and being too small, resulting in failure to meet the deformation requirements of the cover assembly 1.

[0073] For example, the density ρ2 of the reinforcing plate 6 can be set to: 2700 kg / m 3 、3700kg / m 34700kg / m 3 5700kg / m 3 、6700kg / m 3 , 7700kg / m 3 、7850kg / m 3 Any value or a range between any two values.

[0074] In some embodiments, the reinforcement plate 6 in the present application can be made of a metal material, specifically aluminum, steel, titanium, or other lightweight, high-strength metal materials. Of course, the reinforcement plate 6 can also be made of a non-metallic material, specifically carbon fiber, high-performance para-aramid fiber, or other lightweight, high-strength non-metallic materials.

[0075] Optionally, the tensile strength σ1 of the base plate 4 satisfies: 250 MPa≤σ1≤350 MPa.

[0076] In the embodiment of the present application, by setting the tensile strength σ1 of the base plate 4, the range requirements in formula (1) can be met, so that the battery assembly meets the minimum energy density requirements and deformation requirements.

[0077] For example, the tensile strength σ1 of the base plate 4 can be set to any value such as 250 MPa, 275 MPa, 300 MPa, 325 MPa, 350 MPa, or a range between any two values.

[0078] Optionally, the tensile strength σ2 of the reinforcing plate 6 satisfies: 310 MPa≤σ2≤980 MPa.

[0079] In the embodiment of the present application, by setting the tensile strength σ2 of the reinforcing plate 6, the range requirements of formula (1) can be met, so that the battery assembly meets the minimum energy density requirements and deformation requirements.

[0080] For example, the tensile strength σ2 of the reinforcing plate 6 can be set to any value such as 310 MPa, 400 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 980 MPa, or a range between any two values.

[0081] Optionally, a sealing plate 5 is further included. The sealing plate 5 is arranged on the side of the base plate 4 facing the vehicle body frame 3 . A hollow portion 7 is provided in the sealing plate 5 , and the reinforcing plate 6 is provided in the hollow portion 7 .

[0082] In the embodiment of the present application, the sealing plate 5 is disposed on the side of the base plate 4 facing the vehicle body frame 3, a hollow portion 7 is defined in the sealing plate 5, and the reinforcing plate 6 is disposed within the hollow portion 7. Thus, by disposing the reinforcing plate 6 within the hollow portion 7, the overall weight of the cover plate assembly 1 is reduced while also reinforcing a local area of the floor panel to meet the floor panel's usage requirements and structural strength requirements.

[0083] In specific applications, such as Figures 1 to 3 As shown, a seal 9 is provided between the sealing plate 5 and the vehicle body frame 3, and the sealing plate 5 is sealed to the vehicle body frame 3 via the seal 9. For example, the seal 9 may be a sealing foam continuously provided along the circumference of the sealing plate 5 to ensure sealing between the battery assembly and the vehicle body frame 3.

[0084] In some embodiments, in the areas of the sealing plate 5 corresponding to the driver's seat and the passenger seat, the sealing plate 5 is provided with two sub-hollow portions spaced apart along the width direction of the vehicle body, and the reinforcing plate 6 can be disposed in the two sub-hollow portions. This allows the overall mass of the cover plate assembly 1 to be further reduced while still meeting the deformation resistance requirements of the cover plate assembly 1.

[0085] It should be noted that the sealing plate 5 must also meet the V-0 flame retardancy requirements of the UL94 Flame Retardancy Test Method and Standard. The V-0 flame retardancy requirements are as follows: the sample is subjected to two 10-second combustion tests, and the flame must be extinguished within 30 seconds, with no burning material falling.

[0086] Optionally, the thickness d1 of the base plate 4 satisfies: 0.4 mm≤d1≤0.8 mm; preferably, the thickness d1 of the base plate 4 is 0.4 mm.

[0087] In the embodiment of the present application, by setting the thickness d1 of the base plate 4, the cover plate assembly 1 will not be too heavy due to the thickness d1 of the base plate 4 being too large, thereby failing to meet the minimum energy density requirement of the battery assembly; at the same time, it will avoid the thickness d1 of the base plate 4 being too small to meet the deformation requirement of the cover plate assembly 1.

[0088] For example, the thickness d1 of the base plate 4 can be set to any value such as 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or a range between any two values.

[0089] Optionally, the thickness d2 of the reinforcing plate 6 satisfies: 0.6 mm ≤ d2 ≤ 2.5 mm.

[0090] In the embodiment of the present application, by setting the thickness d2 of the reinforcing plate 6, the cover plate assembly 1 will not be too heavy due to the thickness d2 of the reinforcing plate 6 being too large, thereby failing to meet the minimum energy density requirement of the battery assembly; at the same time, it is avoided that the thickness d2 of the reinforcing plate 6 is too small and fails to meet the deformation requirement of the cover plate assembly 1.

[0091] Exemplarily, the thickness d2 of the reinforcing plate 6 can be set to any value such as 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.5 mm, or a range between any two values.

[0092] In some embodiments, the thickness d1 of the base plate 4 and the thickness d2 of the reinforcement plate 6 can be measured using a measuring tool such as a vernier caliper or a thickness gauge.

[0093] Optionally, the thickness of the sealing plate 5 is d3, which satisfies: 0≤|d3-d2|≤2mm. Preferably, |d3-d2|=0.

[0094] In the embodiment of the present application, by setting the full difference between the thickness d3 of the sealing plate 5 and the thickness d2 of the reinforcing plate 6 within a certain range, it is possible to avoid an excessively large thickness difference between the sealing plate 5 and the reinforcing plate 6, which would result in failure to meet the flatness requirements of the floor.

[0095] It should be noted that the thickness d3 of the sealing plate 5 is measured in the same manner as the thickness d1 of the base plate 4 and the thickness d2 of the reinforcing plate 6 .

[0096] Alternatively, as Figure 3 As shown, there are multiple hollow parts 7, and the multiple hollow parts 7 are arranged at intervals.

[0097] In an embodiment of the present application, a plurality of hollow portions 7 are arranged at intervals, and a reinforcing plate 6 is arranged in the hollow portions 7. In this way, the reinforcing plates 6 are arranged at intervals in the passenger compartment in different areas along the length direction of the vehicle body, so as to meet the anti-deformation ability of the cover assembly 1 and reduce the overall mass of the cover assembly 1.

[0098] In some embodiments, as Figure 3 As shown, the distance W between the edge of the hollow portion 7 and the outer edge of the sealing plate 5 needs to satisfy: W>70mm. This ensures a wide enough overlap between the vehicle body frame 3 and the sealing plate 5 to ensure sealing between the sealing plate 5 and the vehicle body frame 3.

[0099] Optionally, the base plate 4 is provided with a plurality of through holes 8 ; the plurality of through holes 8 are arranged at intervals at the circumferential edge of the base plate 4 , and the through holes 8 pass through the sealing plate 5 .

[0100] In an embodiment of the present application, a plurality of through holes 8 are arranged at intervals at the circumferential edge of the base plate 4, and the through holes 8 pass through the sealing plate, so that the fasteners can pass through the sealing plate 5, the base plate 4 and the shell 2 of the battery assembly in sequence.

[0101] In some embodiments, a plurality of through holes 8 are provided at the circumferential edge of the sealing plate 5, and the through holes 8 of the sealing plate 5 communicate with the through holes 8 of the base plate 4. When installing the cover plate assembly 1 and the battery assembly housing 2, fasteners such as bolts can be used to sequentially penetrate the sealing plate 5, the base plate 4, and the battery assembly housing 2 to seal and connect them, thereby facilitating assembly of the cover plate assembly 1.

[0102] Optionally, the distance between two adjacent through holes 8 is 60 mm-100 mm.

[0103] In an embodiment of the present application, the distance between two adjacent through holes 8 is set to 60mm-100mm, so as to ensure that there are enough fasteners passing through the through holes 8 to connect with the shell 2 of the battery assembly, thereby improving the connection strength between the cover assembly 1 and the shell 2 of the battery assembly.

[0104] For example, the distance between two adjacent through holes 8 can be set to any value such as 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, or a range between any two values.

[0105] Optionally, the through hole 8 has a diameter of 6.5 mm to 8 mm.

[0106] In the embodiment of the present application, the aperture size of the through hole 8 is set to 6.5mm-8mm, so that a sufficiently small fastener can pass through the through hole 8 to connect with the shell 2 of the battery assembly, so as to avoid a large gap between the fastener and the through hole 8, thereby destroying the sealing between the cover assembly 1 and the shell 2 of the battery assembly.

[0107] For example, the aperture size of the through hole 8 can be set to: 6.5 mm, 6.8 mm, 7.1 mm, 7.4 mm, 7.7 mm, 8.0 mm, or any other value or a range between any two values.

[0108] Optionally, the base plate 4 is made of a composite material; the composite material includes: 30wt%-50wt% of resin and 50wt%-70wt% of glass fiber.

[0109] In the embodiments of the present application, because composite materials have excellent tensile strength and low density, the use of a composite base plate 4 can balance deformation resistance and weight, thereby meeting the minimum energy density and deformation requirements of the battery assembly. Furthermore, because glass fiber and resin have excellent insulation properties, the use of a glass fiber and resin base plate 4 can also isolate the battery cells within the battery assembly from the metal reinforcement plate 6 and the vehicle body frame 3 when sealing the battery assembly housing 2, thereby preventing leakage from the cells from being conducted to the reinforcement plate 6 and the vehicle body frame 3, endangering personal safety. Furthermore, the glass fiber and resin base plate 4 also has the advantage of low cost.

[0110] For example, the resin content can be set to any value such as 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, or a range between any two values.

[0111] For example, the glass fiber content can be set to any value such as 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, or a range between any two values.

[0112] In some embodiments, the resin may include a thermosetting resin or a thermoplastic resin. Thermosetting resins may include polyurethane, epoxy resin, polyester resin, and vinyl ester resins, while thermoplastic resins may include polypropylene, polyethylene, and polyvinyl chloride. The glass fiber may include long fibers, short fibers, or a mixture of long and short fibers.

[0113] In some other embodiments, the density of the composite material may be 1.8 g / cm 3 , the tensile strength of glass fiber can be 300MPa.

[0114] In a second aspect, an embodiment of the present application proposes a battery assembly, comprising a cover plate assembly 1 as in any one of the above embodiments.

[0115] In this embodiment, a base plate 4 is connected to the battery assembly housing 2 on one side and to the vehicle body frame 3 on the other side to form at least a portion of the vehicle's floor. A reinforcement plate 6 is provided on the side of the base plate 4 facing the vehicle body frame. The reinforcement plate 6 at least partially covers the footrest area of the vehicle's passenger compartment. Furthermore, the cover plate assembly is configured to satisfy the condition 12 ≤ ln(ρ2 × d2 × σ2 ÷ ln(ρ1 × d1 × σ1)) ≤ 13. Thus, by designing the performance of the base plate 4 and reinforcement plate 6, and providing the reinforcement plate 6 in the passenger compartment footrest area, the deformation requirements of the cover plate assembly 1 are met, preventing damage to the cells within the battery assembly housing 2, which could lead to leakage. Furthermore, overdesign, which could result in excessive weight that fails to meet the minimum energy density requirements of the battery assembly, is avoided, thereby achieving a balance between vehicle lightweighting and structural strength. Furthermore, the cover plate assembly 1 can be connected to the battery assembly housing 2 to seal the battery assembly, and can also be connected to the vehicle body frame 3 to form at least a portion of the vehicle's floor, improving the integration of the battery assembly into the vehicle.

[0116] In some embodiments, as Figure 1 As shown, the battery assembly includes a housing 2, battery cells, and a cover assembly 1. The housing 2 of the battery assembly has a receiving cavity, within which the battery cells are disposed. The cover assembly 1 seals the opening of the cavity. Generally, the battery assembly can be a battery pack, in which the housing 2 is a battery tray. The battery tray has a receiving cavity and is sealed and connected to the cover assembly 1, within which the battery cells are disposed. Alternatively, the housing 2 of the battery assembly can be used solely to accommodate the battery cells, with the cover assembly 1 secured to the battery cells.

[0117] In a third aspect, an embodiment of the present application proposes a vehicle, comprising a cover plate assembly 1 as in any one of the above embodiments; or, comprising a battery assembly as in the above embodiments.

[0118] In this embodiment, a base plate 4 is connected to the battery assembly housing 2 on one side and to the vehicle body frame 3 on the other side to form at least a portion of the vehicle's floor. A reinforcement plate 6 is provided on the side of the base plate 4 facing the vehicle body frame. The reinforcement plate 6 at least partially covers the footrest area of the vehicle's passenger compartment. Furthermore, the cover plate assembly is configured to satisfy the condition 12 ≤ ln(ρ2 × d2 × σ2 ÷ ln(ρ1 × d1 × σ1)) ≤ 13. Thus, by designing the performance of the base plate 4 and reinforcement plate 6, and providing the reinforcement plate 6 in the passenger compartment footrest area, the deformation requirements of the cover plate assembly 1 are met, preventing damage to the cells within the battery assembly housing 2, which could lead to leakage. Furthermore, overdesign, which could result in excessive weight that fails to meet the minimum energy density requirements of the battery assembly, is avoided, thereby achieving a balance between vehicle lightweighting and structural strength. Furthermore, the cover plate assembly 1 can be connected to the battery assembly housing 2 to seal the battery assembly, and can also be connected to the vehicle body frame 3 to form at least a portion of the vehicle's floor, improving the integration of the battery assembly into the vehicle.

[0119] In some embodiments, as Figure 1 As shown, the vehicle includes a body frame 3, a seat cross member 11, and seats 10. The body frame 3 is sealed to the sealing plate 5 in the cover assembly 1. The seat cross member 11 is positioned on the body frame 3 corresponding to the sealing plate 5, and the seats 10 are mounted on the seat cross member 11. Reinforcement plates 6 are installed in front of each row of seats 10, each corresponding to a footrest area, to prevent deformation of the cover assembly 1 caused by occupants stepping on it or heavy objects falling from the passenger compartment.

[0120] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0121] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and purpose of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly includes: a base plate and a reinforcement plate; One side of the base plate is adapted to be connected to the housing of the battery assembly, and the other side of the base plate is adapted to be connected to the vehicle body frame to form at least a portion of the floor of the vehicle. The reinforcement plate is provided on a side of the base plate facing the vehicle body frame, and the reinforcement plate is adapted to at least partially cover the footrest area of the vehicle passenger compartment. The cover plate assembly satisfies: 12≤ln(ρ2×d2×σ2÷ln(ρ1×d1×σ1))≤13; The density of the base plate is ρ1, the tensile strength of the base plate is σ1, and the thickness of the base plate is d1; the density of the reinforcing plate is ρ2, the tensile strength of the reinforcing plate is σ2, and the thickness of the reinforcing plate is d2.

2. The cover plate assembly according to claim 1, wherein: The density ρ1 of the base plate meets the following requirements: 1800 kg / m 3 ≤ρ1≤2000kg / m 3 ; and / or, the density ρ2 of the reinforcing plate satisfies: 2700kg / m 3 ≤ρ2≤7850kg / m 3 .

3. The cover plate assembly according to claim 1, wherein: The tensile strength σ1 of the base plate satisfies: 250 MPa≤σ1≤350 MPa; and / or the tensile strength σ2 of the reinforcement plate satisfies: 310 MPa≤σ2≤980 MPa.

4. The cover plate assembly according to claim 1, wherein: The thickness d1 of the base plate satisfies: 0.4 mm ≤ d1 ≤ 0.8 mm; and / or the thickness d2 of the reinforcing plate satisfies: 0.6 mm ≤ d2 ≤ 2.5 mm.

5. The cover plate assembly according to claim 1, wherein: It also includes a sealing plate; the sealing plate is arranged on the side of the base plate facing the vehicle body frame, the sealing plate is provided with a hollow portion, and the reinforcing plate is arranged in the hollow portion.

6. The cover plate assembly according to claim 5, wherein: The thickness of the sealing plate is d3, which satisfies: 0≤|d3-d2|≤2mm.

7. The cover plate assembly according to claim 5, wherein: The hollow portions are provided in plurality, and the plurality of hollow portions are arranged at intervals.

8. The cover plate assembly according to claim 5, wherein: The base plate is provided with a plurality of through holes; the plurality of through holes are arranged at intervals at the circumferential edge of the base plate, and the through holes penetrate the sealing plate.

9. The cover plate assembly according to claim 8, wherein: The distance between two adjacent through holes is 60 mm to 100 mm; and / or the aperture of the through hole is 6.5 mm to 8 mm.

10. The cover plate assembly according to any one of claims 1 to 9, characterized in that: The base plate is made of a composite material; the composite material comprises: 30wt%-50wt% of resin and 50wt%-70wt% of glass fiber.

11. A battery assembly, characterized in that: The invention comprises the cover plate assembly according to any one of claims 1 to 10.

12. The battery assembly according to claim 11, wherein: It also includes a shell and a battery cell. The shell is provided with a receiving cavity, the battery cell is arranged in the receiving cavity, and the cover plate assembly is sealed on the cavity opening of the receiving cavity.

13. A vehicle, characterized in that: It comprises the cover plate assembly according to any one of claims 1 to 10; or, it comprises the battery assembly according to claim 11 or 12.

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