Battery pack multilayer composite protection plate

Abstract

The utility model relates to power battery structural member technical field especially relates to a kind of battery pack multilayer composite protective plate, including fireproof coating, fibre resin composite layer, PVC anti stone strike coating, metal layer and buffer layer sequentially from outside to inside setting. The utility model design is scientific and reasonable, fireproof coating uses high-temperature-resistant ceramicized silicone rubber material, can form heat shield barrier above 300 DEG C high temperature, prevent heat runaway smoke spread to passenger cabin;Fibre resin composite layer uses aramid fibre-polypropylene composite material, improves puncture resistance, prevents stone impact damage;And the composite material is made by specific process, and physical combination effect is good;PVC anti stone strike coating is formed by PVC anti stone strike coating, and stone strike can be effectively resisted. Metal layer uses high-strength manganese steel material, and strength is guaranteed;Buffer layer uses closed-cell polyurethane foam material, and buffering effect is good;Each layer is connected by epoxy resin adhesive, and interlayer peel strength is high.

Description

Technical Field

[0001] This utility model relates to the field of power battery structural components, and in particular to a multi-layer composite protective plate for a battery pack. Background Technology

[0002] Driven by the goal of carbon neutrality, the global new energy vehicle industry is developing rapidly. As the core component of electric vehicles, the performance of the battery pack—its carrier—directly affects the safety, range, and environmental adaptability of the entire vehicle. Compared with traditional fuel vehicles, electric vehicle battery systems must meet multiple stringent requirements, including lightweighting, high strength, and corrosion resistance. The battery pack's weight accounts for approximately 10% to 20% of the total battery pack weight, making lightweight design crucial for improving energy density.

[0003] Currently, mainstream battery packs use aluminum alloys and other metal materials for their casings to balance lightweight design and processing performance. However, aluminum alloys have significant inherent drawbacks: their low hardness makes them susceptible to deformation or breakage from impacts by flying stones or foreign objects during vehicle operation, potentially leading to short circuits, thermal runaway, or even explosions in the battery modules. Therefore, a protective plate needs to be installed at the bottom of the battery pack.

[0004] Existing protective plates installed at the bottom of battery packs are mostly single-layer metal materials, which cannot simultaneously meet the comprehensive requirements of impact resistance, heat insulation and lightweighting. At the same time, metal protective plates are prone to surface corrosion, increasing maintenance costs and reducing protection reliability. Summary of the Invention

[0005] The purpose of this utility model is to overcome the above-mentioned problems existing in the traditional technology and provide a multi-layer composite protective plate for battery packs.

[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution: A multi-layer composite protective plate for a battery pack includes, from the outside to the inside, a fire-retardant coating, a fiber resin composite layer, a PVC stone-impact resistant coating, a metal layer, and a buffer layer.

[0007] Furthermore, in the aforementioned multi-layer composite protective plate for the battery pack, the thickness of the fire-retardant coating is 0.1–0.5 mm, and it is made of high-temperature resistant ceramicized silicone rubber material.

[0008] Furthermore, in the aforementioned multi-layer composite protective plate for the battery pack, the thickness of the fiber resin composite layer is 0.5–1.0 mm, and it is made of aramid fiber-polypropylene composite material.

[0009] Furthermore, in the aforementioned multi-layer composite protective plate of the battery pack, the aramid fiber-polypropylene composite material is formed by hot pressing aramid fabric, PP film, and PP fiber fabric sequentially. The hot pressing is performed using a double steel belt press at a pressure of 0.5–0.7 MPa and a temperature of 160–180°C, slightly higher than the melting point of PP. The heat and pressure are maintained for 5–10 minutes, allowing the PP film to melt and penetrate into the pores of the aramid fibers through capillary action, forming a physical bond.

[0010] Furthermore, in the aforementioned multi-layer composite protective plate for the battery pack, the PVC anti-stone-impact coating is formed by applying PVC anti-stone-impact paint to the outer surface of the metal layer.

[0011] Furthermore, in the aforementioned multi-layer composite protective plate for the battery pack, the thickness of the metal layer is 0.6–1.2 mm, and it is made of high-strength manganese steel.

[0012] Furthermore, in the aforementioned multi-layer composite protective plate for the battery pack, the thickness of the buffer layer is 4mm to 8mm, and it is made of closed-cell polyurethane foam material.

[0013] Furthermore, in the aforementioned multi-layer composite protective plate for the battery pack, the layers are connected by epoxy resin adhesive. The adhesive layer formed by the epoxy resin adhesive has a thickness of 0.1–0.3 mm, ensuring an interlayer peel strength >50 N / mm. 2 .

[0014] The beneficial effects of this utility model are: The multi-layer composite protective plate of the battery pack provided by this utility model has a scientific and reasonable design. The fireproof coating uses high-temperature resistant ceramicized silicone rubber material, which can form a heat insulation barrier at temperatures above 300℃ to prevent thermal runaway smoke from spreading to the passenger compartment. The fiber resin composite layer uses aramid fiber-polypropylene composite material to improve puncture resistance and prevent damage from stone impacts. Moreover, this composite material is made through a specific process, resulting in good physical bonding. The PVC anti-stone-impact coating is formed by applying PVC anti-stone-impact paint, which can effectively resist stone impacts. The metal layer uses high-strength manganese steel material, ensuring strength. The buffer layer uses closed-cell polyurethane foam material, providing excellent cushioning. The layers are connected by epoxy resin adhesive, resulting in high interlayer peel strength.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall composition of this utility model; In the attached diagram, the components represented by each number are as follows: 1-Fireproof coating, 2-Fiber resin composite layer, 3-PVC stone chip resistant coating, 4-Metal layer, 5-Buffer layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] like Figure 1 As shown, this embodiment provides a multi-layer composite protective plate for a battery pack. The multi-layer composite protective plate for a battery pack includes a fireproof coating 1, a fiber resin composite layer 2, a PVC stone-impact resistant coating 3, a metal layer 4, and a buffer layer 5 arranged sequentially from the outside to the inside.

[0020] In this embodiment, the thickness of the fireproof coating 1 is 0.1 to 0.5 mm, and it is made of high-temperature resistant ceramicized silicone rubber material.

[0021] In this embodiment, the thickness of the fiber resin composite layer 2 is 0.5 to 1.0 mm, and it is made of aramid fiber-polypropylene composite material.

[0022] In this embodiment, the aramid fiber-polypropylene composite material is formed by hot pressing aramid fabric, PP film, and PP fiber fabric in sequence. The hot pressing is carried out using a double steel belt press with a pressure of 0.5-0.7 MPa and a temperature of 160-180°C, which is slightly higher than the melting point of PP. The heat and pressure are maintained for 5-10 minutes, so that the PP film melts and penetrates into the pores of the aramid fiber through capillary action to form a physical bond.

[0023] In this embodiment, the PVC anti-stone impact coating 3 is formed by coating the outer surface of the metal layer with PVC anti-stone impact paint.

[0024] In this embodiment, the thickness of the metal layer 4 is 0.6 to 1.2 mm, and it is made of high-strength manganese steel.

[0025] In this embodiment, the thickness of the buffer layer is 4mm to 8mm, and it is made of closed-cell polyurethane foam material.

[0026] In this embodiment, the layers of the multilayer composite protective plate of the battery pack are connected by epoxy resin adhesive. The thickness of the adhesive layer formed by the epoxy resin adhesive is 0.1-0.3 mm, ensuring that the interlayer peel strength is >50 N / mm. 2 .

[0027] One specific application of this embodiment is as follows: This protective panel achieves comprehensive protection from high-temperature insulation to mechanical impact protection through a multi-layered synergistic mechanism of "fireproofing, impact resistance, buffering, and structural support," while also considering the requirements of lightweighting and durability. The fireproof coating uses high-temperature resistant ceramicized silicone rubber material, which can form a thermal barrier at temperatures above 300°C to prevent thermal runaway smoke from spreading to the passenger compartment; the fiber resin composite layer uses aramid fiber-polypropylene composite material to improve puncture resistance and prevent damage from stone impacts; moreover, this composite material is manufactured through a specific process, resulting in good physical bonding; the PVC anti-stone-impact coating is formed by applying PVC anti-stone-impact paint, which can effectively resist stone impacts. The metal layer uses high-strength manganese steel material, ensuring strength; the buffer layer uses closed-cell polyurethane foam material, providing excellent buffering effect; and the layers are connected by epoxy resin adhesive, resulting in high interlayer peel strength.

[0028] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to specific implementation methods. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-layer composite protective plate for a battery pack, characterized in that, The battery pack's multi-layer composite protective panel includes, from the outside to the inside, a fire-retardant coating, a fiber resin composite layer, a PVC stone-impact resistant coating, a metal layer, and a buffer layer. The fireproof coating has a thickness of 0.1 to 0.5 mm and is made of high-temperature resistant ceramicized silicone rubber material. The thickness of the fiber-resin composite layer is 0.5–1.0 mm, and it is made of aramid fiber-polypropylene composite material; The thickness of the metal layer is 0.6–1.2 mm, and it is made of high-strength manganese steel. The thickness of the buffer layer is 4mm to 8mm, and it is made of closed-cell polyurethane foam.

2. The multi-layer composite protective plate for a battery pack according to claim 1, characterized in that, The aramid fiber-polypropylene composite material is formed by hot pressing aramid fabric, PP film, and PP fiber fabric in sequence.

3. The multi-layer composite protective plate for a battery pack according to claim 2, characterized in that, The PVC anti-stone-impact coating is formed by applying PVC anti-stone-impact paint to the outer surface of the metal layer.

4. The multi-layer composite protective plate for a battery pack according to claim 3, characterized in that, The layers of the multi-layer composite protective plate of the battery pack are connected by epoxy resin adhesive. The thickness of the adhesive layer formed by the epoxy resin adhesive is 0.1 to 0.3 mm, ensuring that the interlayer peel strength is >50 N / mm.

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