New energy automobile battery pack bottom guard plate

Abstract

The utility model discloses a new energy automobile battery package bottom fender, belong to new energy automobile battery technical field, and its technical scheme main points include fender, including fender body, the fender body is by carbon fiber reinforced polyether ether ketone composite material integrated moulding, the outer surface of fender body has first protective coating and second protective coating in proper order, the top of fender body is fixedly connected with sealed convex ring, the first protective coating is nanometer ceramic coating, the thickness of nanometer ceramic coating is 50 150um, second protective coating is evenly coated in the surface of first protective coating, and the second protective coating is polyurea elastomer coating, has solved the existing part new energy automobile battery package metal bottom fender heavy, easy to be corroded, and the single protection structure is single, and most are single -layer coating or no special protective coating design, leading to the weak wear resistance, anti -stone, anticorrosion performance, and the fender edge sealing performance is poor, and the problem of easy to enter water and dust.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle battery technology, and in particular to a bottom protective plate for a new energy vehicle battery pack. Background Technology

[0002] The bottom guard plate of a new energy vehicle battery pack is a rigid protective structure installed at the bottom of the battery pack. Its core function is to provide bottom protection for the battery pack. It is one of the key safety components of the new energy vehicle battery system and is directly related to the safety, durability and overall vehicle reliability of the battery pack.

[0003] In traditional new energy vehicle designs, battery underbody protection plates are typically made of steel plates. The main reason for this is to ensure the strength and durability of the battery underbody protection plate, thereby protecting the battery pack from damage caused by the external environment. However, this approach also leads to an increase in the curb weight of new energy vehicles, because metal materials such as steel plates are relatively heavy. Metal underbody protection plates increase the overall weight of the vehicle, which in turn affects the vehicle's energy consumption and range. Metal materials are prone to corrosion when exposed to humid environments for a long time, which may shorten the service life of the underbody protection plate. In the field of new energy vehicles, lightweight design of battery underbody protection plates is particularly critical, because it not only relates to the vehicle's performance but also directly affects the safety and lifespan of the battery pack.

[0004] The existing patent (publication number: CN223285126U) discloses a bottom protection plate for a battery pack of a new energy vehicle. This application can reduce the weight of the bottom protection plate while maintaining sufficient strength and rigidity, and has excellent corrosion resistance. It can not only better ensure safety, but also improve the overall performance and economy of the vehicle.

[0005] To address the aforementioned issues, existing patents have provided solutions. However, the existing metal bottom guard plates for some new energy vehicle battery packs are heavy, easily corroded, and have a simple protective structure, often consisting of a single-layer coating or no dedicated protective coating design. This results in weak wear resistance, stone impact resistance, and corrosion resistance, as well as poor sealing performance at the edges of the guard plates, making them prone to water and dust ingress.

[0006] To address this, a bottom protection plate for new energy vehicle battery packs is proposed. Utility Model Content

[0007] The purpose of this utility model is to provide a bottom guard plate for new energy vehicle battery packs, which can solve the problems of existing metal bottom guard plates for new energy vehicle battery packs being heavy, easily corroded, and having a simple protective structure, mostly with a single-layer coating or no special protective coating design, resulting in weak wear resistance, stone impact resistance, corrosion resistance, poor sealing performance at the edge of the guard plate, and easy water and dust ingress.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a bottom guard plate for a new energy vehicle battery pack, comprising a guard plate body, wherein the guard plate body is integrally formed from carbon fiber reinforced polyether ether ketone composite material, and the outer surface of the guard plate body is sequentially coated with a first protective coating and a second protective coating, and a sealing protrusion ring is fixedly connected to the top of the guard plate body.

[0009] Preferably, the first protective coating is a nano-ceramic coating, and the thickness of the nano-ceramic coating is 50-150 μm.

[0010] Preferably, the second protective coating is uniformly coated on the surface of the first protective coating. The second protective coating is a polyurea elastomer coating with a thickness of 200-400 μm and a Shore hardness of D55-D65.

[0011] Preferably, a plurality of buffer bosses are fixedly connected to the top of the protective plate body. The buffer bosses are made of polyurethane elastic material and are connected to the protective plate body by hot pressing.

[0012] Preferably, the protective plate body has a plurality of weight-reducing holes, and the inner wall of the weight-reducing holes is coated with a protective layer of the same material as the first protective coating.

[0013] Preferably, the thickness of the protective plate body is 10mm, the height of the sealing protrusion ring and the buffer protrusion is 6mm, and the material of the sealing protrusion ring is EPDM rubber.

[0014] Preferably, a silane coupling agent treatment layer is provided between the first protective coating and the protective plate body, and the thickness of the silane coupling agent treatment layer is 5-10 μm.

[0015] Preferably, the interior of the protective plate body has several mounting holes.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This application utilizes a carbon fiber reinforced polyetheretherketone composite material for integral molding, achieving both high strength and lightweight design. This addresses the issues of heavy weight and easy corrosion in existing metal bottom protection plates of some new energy vehicle battery packs. A dual-layer protective coating of nano-ceramic and polyurea elastomer, combined with a silane coupling agent treatment layer, synergistically enhances wear resistance, stone impact resistance, and corrosion resistance, overcoming the shortcomings of traditional single-layer or no protective coatings. EPDM rubber sealing protrusions strengthen the seal and prevent water and dust ingress. Polyurethane buffer bosses provide shock absorption and reduce impact damage to the battery pack. The weight-reducing hole design balances lightweight design and corrosion resistance, while mounting holes ensure stable assembly. All structures work together to achieve comprehensive protection of the battery pack bottom, lightweight support, and reliable assembly. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of the bottom protective plate of the new energy vehicle battery pack of this utility model;

[0019] Figure 2 This utility model Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 This is a cross-sectional view of the protective plate body in this utility model.

[0021] In the figure, 1 is the protective plate body; 2 is the buffer boss; 3 is the sealing protrusion ring; 4 is the mounting hole; 5 is the weight reduction hole; 6 is the first protective coating; 7 is the second protective coating; and 8 is the silane coupling agent treatment layer. Detailed Implementation

[0022] 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 protection scope of the present utility model.

[0023] Please see Figure 1-3 The present invention provides the following technical solution:

[0024] A bottom guard plate for a new energy vehicle battery pack includes a guard plate body 1, which is integrally formed from carbon fiber reinforced polyether ether ketone composite material. The outer surface of the guard plate body 1 is sequentially coated with a first protective coating 6 and a second protective coating 7. A sealing protrusion ring 3 is fixedly connected to the top of the guard plate body 1.

[0025] In this embodiment: the protective plate body 1 is integrally molded from carbon fiber reinforced polyetheretherketone composite material, providing core support for the bottom of the battery pack with its high strength and lightweight characteristics. Its top 6mm high-sealing raised ring 3 made of EPDM rubber fits tightly against the battery pack shell after assembly, achieving a reliable seal and preventing rainwater and mud intrusion. The outer surface of the protective plate body 1 is treated with a 5-10μm silane coupling agent layer 8 to ensure the first protective coating 6 adheres firmly, providing corrosion resistance and wear resistance. The second protective coating 7 absorbs impact energy, forming a synergistic protection system. The polyurethane elastic layer is then bonded via hot-pressing. The elastic material buffer boss 2, when the vehicle encounters a minor impact, utilizes the elasticity of polyurethane to convert mechanical vibration energy into heat energy for dissipation, preventing rigid impact from being directly transmitted to the battery pack. The weight reduction hole 5 achieves lightweighting and has a protective inner wall. The mounting hole 4 ensures stable assembly, realizing comprehensive protection of the bottom of the battery pack, lightweight support, and reliable assembly. This solves the problems of heavy metal bottom guard plates of some existing new energy vehicle battery packs, easy corrosion, simple protective structure, mostly single-layer coating or no special protective coating design, resulting in weak wear resistance, stone impact resistance, corrosion resistance, poor sealing performance of the guard plate edges, and easy water and dust ingress.

[0026] Specifically, such as Figure 3 As shown, the first protective coating 6 is a nano-ceramic coating with a thickness of 50-150 μm.

[0027] Specifically, such as Figure 3 As shown, the second protective coating 7 is uniformly coated on the surface of the first protective coating 6. The second protective coating 7 is a polyurea elastomer coating with a thickness of 200-400μm and a Shore hardness of D55-D65.

[0028] In this embodiment, a 50-150μm nano-ceramic coating forms a dense, wear-resistant, and corrosion-resistant barrier, while a 200-400μm polyurea elastomer coating with a Shore hardness of D55-D65 is uniformly applied to its surface. The two work together to achieve hard protection plus soft buffering, significantly improving the guard plate's resistance to stone impacts, impact resistance, and weather resistance, and preventing damage to the substrate.

[0029] Specifically, such as Figure 2 As shown, several buffer bosses 2 are fixedly connected to the top of the protective plate body 1. The buffer bosses 2 are made of polyurethane elastic material and are connected to the protective plate body 1 by hot pressing.

[0030] Specifically, such as Figure 2 As shown, the protective plate body 1 has several weight reduction holes 5, and the inner wall of the weight reduction holes 5 is coated with a protective layer of the same material as the first protective coating 6.

[0031] In this embodiment: the polyurethane elastic material buffer boss 2 is fixed by hot pressing composite. After the protective plate body 1 is installed, the buffer boss 2 contacts the bottom of the battery pack, which efficiently absorbs the vibration and impact energy and reduces the rigid transmission of the impact to the battery pack. The weight reduction hole 5 achieves lightweighting while ensuring structural strength. Its inner wall protective layer of the same material ensures corrosion protection without dead corners on the entire surface.

[0032] Specifically, such as Figure 2 As shown, the thickness of the protective plate body 1 is 10mm, the height of the sealing protrusion 3 and the buffer protrusion 2 are both 6mm, and the material of the sealing protrusion 3 is EPDM rubber.

[0033] Specifically, such as Figure 2 As shown, a silane coupling agent treatment layer 8 is provided between the first protective coating 6 and the protective plate body 1, and the thickness of the silane coupling agent treatment layer 8 is 5-10μm.

[0034] Specifically, such as Figure 2 As shown, the interior of the protective plate body 1 has several mounting holes 4.

[0035] In this embodiment: the 10mm thick protective plate body 1 takes into account both strength and adaptability, the 6mm high EPDM rubber sealing protrusion ring 3 strengthens the sealing protection, the 5-10μm silane coupling agent treatment layer 8 improves the bonding strength between the coating and the protective plate body 1, and the mounting hole 4 provides a reliable guarantee for the stable assembly of the protective plate body 1. All features work together to optimize the overall practical performance of the protective plate body 1.

[0036] Working principle: The protective plate body 1 is integrally molded from carbon fiber reinforced polyetheretherketone composite material. Leveraging the synergistic characteristics of this composite material's high strength and lightweight properties, it provides core structural support for the bottom of the battery pack. Simultaneously, the EPDM rubber sealing protrusion ring 3, fixedly connected to the top of the protective plate body 1, fits tightly against the battery pack shell at a height of 6mm after the protective plate body 1 is connected to the vehicle body. Utilizing the excellent elasticity and sealing performance of EPDM rubber, it prevents rainwater, mud, and other impurities from intruding and contacting the battery pack, achieving reliable sealing protection. The outer surface of the protective plate body 1 is sealed with a 5-1mm thick... A 0μm silane coupling agent treatment layer 8 strengthens the interfacial bonding force, ensuring a stable connection between the first protective coating 6 and the protective plate body 1 without detachment. This first protective coating 6 is a 50-150μm thick nano-ceramic coating, which, through a dense physical barrier structure, isolates the corrosive medium from direct contact with the protective plate body 1, exhibiting excellent corrosion resistance and wear resistance. The second protective coating 7, uniformly coated on its surface, is a 200-400μm thick polyurea elastomer coating with a Shore hardness of D55-D65. It absorbs the energy generated by the impact and bumps of road stones due to its elastic properties, and combines with the nano-ceramic coating... The layers form a synergistic protection system of hard protection and soft buffer, significantly improving the guard plate's resistance to stone chips and impacts. The top of the guard plate body 1 features a polyurethane elastic material buffer boss 2, which is thermo-pressed and composite-connected. When the vehicle encounters a minor impact, the elasticity of the polyurethane converts the mechanical vibration energy into heat energy for dissipation, preventing the rigid impact from being directly transmitted to the battery pack. Several weight-reducing holes 5 on the guard plate body 1 achieve lightweight design while ensuring structural strength. The inner wall of these holes is coated with a protective layer of the same material as the first protective coating 6, ensuring that the weight-reducing holes 5 are not corroded. Combined with a 10mm thick... The protective plate body 1 achieves a balance between strength and lightweight. Several mounting holes 4 inside the protective plate body 1 provide assembly points for the fixed installation of the protective plate and the vehicle body, ensuring that the entire protective plate is firmly installed at the bottom of the vehicle. The various structures work together to ultimately achieve comprehensive protection, lightweight support and reliable assembly of the bottom of the battery pack. This solves the problems of existing metal bottom protective plates for some new energy vehicle battery packs being heavy, easily corroded, and having a single protective structure, mostly with a single-layer coating or no special protective coating design, resulting in weak wear resistance, stone impact resistance and corrosion resistance, poor sealing performance of the protective plate edges, and easy water and dust ingress.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bottom protective plate for a new energy vehicle battery pack, comprising a protective plate body (1), characterized in that: The protective plate body (1) is integrally formed from carbon fiber reinforced polyether ether ketone composite material. The outer surface of the protective plate body (1) is coated with a first protective coating (6) and a second protective coating (7) in sequence. A sealing protrusion ring (3) is fixedly connected to the top of the protective plate body (1).

2. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: The first protective coating (6) is a nano-ceramic coating with a thickness of 50-150 μm.

3. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: The second protective coating (7) is uniformly coated on the surface of the first protective coating (6). The second protective coating (7) is a polyurea elastomer coating with a thickness of 200-400 μm and a Shore hardness of D55-D65.

4. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: The top of the protective plate body (1) is fixedly connected with several buffer bosses (2), which are made of polyurethane elastic material. The buffer bosses (2) are connected to the protective plate body (1) by hot pressing.

5. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: The protective plate body (1) has several weight-reducing holes (5), and the inner wall of the weight-reducing holes (5) is coated with a protective layer of the same material as the first protective coating (6).

6. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: The thickness of the protective plate body (1) is 10mm, the height of the sealing protrusion ring (3) and the buffer protrusion (2) is 6mm, and the material of the sealing protrusion ring (3) is EPDM rubber.

7. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: A silane coupling agent treatment layer (8) is provided between the first protective coating (6) and the protective plate body (1), and the thickness of the silane coupling agent treatment layer (8) is 5-10 μm.

8. The bottom protective plate for a new energy vehicle battery pack according to claim 1, characterized in that: The interior of the protective plate body (1) has several mounting holes (4).

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