High-strength corrosion-resistant power battery tray

Abstract

The utility model relates to the technical field of production of power battery components of new energy vehicles, in particular to a high-strength corrosion-resistant power battery tray. A high-strength corrosion-resistant power battery tray comprises an outer frame, two longitudinal beams are arranged in the middle of the outer frame, the two ends of each longitudinal beam make contact with the outer frame, a liquid cooling plate is fixedly installed on the outer frame through rivets, and a bottom protection plate is fixed to the outer side of the liquid cooling plate. Stainless steel has excellent cost performance, compared with an aluminum alloy and a composite material, the raw material cost is lower, compared with a high-pressure casting and composite material forming process, the steel rolling forming process is lower in equipment and maintenance cost, and the overall production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of production of power battery components for new energy vehicles, in particular to a high-strength, corrosion-resistant power battery tray. Background Art

[0002] Aluminum alloys are widely used in battery cases of new energy vehicles due to their advantages such as light weight, good thermal conductivity and high corrosion resistance. However, aluminum alloys do not have an advantage in strength, the material cost is high, welding is difficult, and the process requirements are high. Therefore, steel roll-pressed cases came into being. High-strength steel materials commonly used in steel roll-pressed cases have high strength, high toughness, high production efficiency, and lower costs compared to aluminum cases, making them more suitable for cost-sensitive applications. However, high-strength steel has a high density, which will increase the weight of the battery case to a certain extent, which will affect the range of new energy vehicles. The corrosion resistance of steel materials themselves is difficult to meet the application requirements of battery cases, and surface treatment processes need to be added. Products after surface treatment are at risk of bumps and scratches during subsequent production and handling, which increases the difficulty of process control and makes it difficult to guarantee the impact of scratches and bumps on long-term use.

[0003] Aluminum alloy extrusion profiles and high pressure casting have the following disadvantages:

[0004] Processing and joining challenges: Although aluminum alloys have good mechanical properties and lightweight characteristics, their joining (especially welding) technology is relatively complex and difficult, which may limit design flexibility and increase manufacturing difficulties.

[0005] Cost issue: The raw material cost of aluminum alloy materials and their high-pressure casting and extrusion processes is relatively high. In addition, for high-pressure casting parts, expensive molds and equipment are required, which increases production costs.

[0006] High-strength steel rolling technology has the following disadvantages:

[0007] 1. Weight issue: Although high-strength steel has excellent strength and cost-effectiveness, its density is greater than that of aluminum alloy and composite materials, which means that when achieving the same strength, the battery box using high-strength steel will be heavier, affecting the energy efficiency of the vehicle.

[0008] 2. Limited design flexibility: Although roll forming technology can improve production efficiency and material utilization, it may not be as flexible as other advanced forming technologies when dealing with complex cross-sections and sections with non-uniform wall thickness.

[0009] 3. Corrosion problem: High-strength steel is more susceptible to corrosion than aluminum alloys and some composite materials. Although this can be reduced through surface treatment and other means, this adds additional processing steps and costs.

[0010] Composite material molding has the following disadvantages:

[0011] 1. High cost: Composite materials, especially carbon fiber reinforced plastics, have very high costs for both raw materials and molding processes, which directly affects the overall cost of the battery case.

[0012] 2. Production efficiency and maintainability issues: The molding process of composite materials (such as RTM, VARI) is more complicated and time-consuming than metal molding, which limits its application in large-scale production. At the same time, once damaged, composite materials are more difficult to repair than metals and may need to be completely replaced, increasing maintenance costs.

[0013] 3. Recycling and environmental issues: The recycling and reuse of composite materials is more challenging than that of metals, especially carbon fiber reinforced composite materials, whose recycling technology is still in the development stage, which poses a challenge to achieving the environmental protection and sustainability goals of battery boxes.

[0014] In view of the above-mentioned defects, the designer actively conducts research and innovation in order to create a high-strength, corrosion-resistant power battery tray to make it more valuable for industrial use. Summary of the invention

[0015] In order to solve the above technical problems, the purpose of the utility model is to provide a high-strength and corrosion-resistant power battery tray.

[0016] The utility model discloses a high-strength corrosion-resistant power battery tray, comprising an outer frame, two longitudinal beams in the middle of the outer frame, two ends of the longitudinal beams in contact with the outer frame, a liquid cooling plate fixedly mounted on the outer frame by rivets, and a bottom guard plate fixed on the outer side of the liquid cooling plate.

[0017] This high-strength, corrosion-resistant power battery tray uses a splicing method to weld the outer frame and longitudinal beams together. The outer frame and longitudinal beams are made of QN1701, QN1803, QN1804, QNI906 or QN2109 stainless steel materials. It has the characteristics of light weight and high strength. The liquid cooling plate provides cooling for the power battery.

[0018] Furthermore, a crossbeam perpendicular to the longitudinal beam is arranged inside the outer frame.

[0019] The crossbeams are installed inside the outer frame to provide strength support for the entire pallet.

[0020] Furthermore, the staggered positions of the longitudinal beams and the transverse beams have openings that cooperate with each other for fitting together.

[0021] The longitudinal beams and transverse beams are staggered to improve the structural stability after installation.

[0022] Furthermore, the outer frame is composed of end beams at both ends and side beams on both sides, and the end beams and the side beams are welded at a 45° angle at the joints.

[0023] The outer frame is welded by end beams and side beams, so the overall strength is guaranteed.

[0024] Furthermore, both ends of the cross beam are vertically welded to the inner sides of the side beams.

[0025] The joining position of the cross beam and the side beam is vertical, and the structure is more solid after welding.

[0026] Furthermore, a lifting lug beam is welded on the outer side of the side beam, and a plurality of lifting lug sleeves are arranged on the lifting lug beam.

[0027] The side wall and the lifting ear beam are fixed by welding, and the setting of the lifting ear sleeve facilitates the entire transportation and installation in the later stage.

[0028] By means of the above scheme, the present invention has at least the following advantages:

[0029] 1. Compared with high-strength steel roll-pressed box, it eliminates the need for additional surface treatment, reducing the cost and environmental impact of this process. It can withstand harsh environmental conditions without being easily damaged, reducing maintenance requirements and costs.

[0030] 2. Compared with aluminum profile box, the connection is more flexible, the raw material cost is lower, the strength is higher, and it can achieve cost reduction and efficiency improvement.

[0031] 3. Compared with composite material boxes, it has a higher recycling rate and recycling value, is easier to recycle and reuse, and is in line with environmental protection and sustainability goals.

[0032] It also has the following advantages:

[0033] 1. Cost-effectiveness: Stainless steel has excellent cost-effectiveness and its raw material cost is lower than that of aluminum alloys and composite materials. Compared with high-pressure casting and composite material forming processes, the steel roll forming process has lower equipment and maintenance costs, which helps to reduce the overall production cost. This solves the problem of high cost of aluminum alloys and composite materials in the existing technology.

[0034] 2. Flexibility in processing and connection: The steel roll forming process combined with welding can effectively process battery boxes of various shapes and sizes, providing higher design flexibility than aluminum alloy welding and composite material forming. In addition, the welding and mechanical connection technology of stainless steel is mature and easy to implement, which solves the problem of difficulty in processing and connecting aluminum alloys.

[0035] 3. Balance between weight and strength: Although stainless steel has a higher density than aluminum alloy, it can achieve high strength and good toughness, allowing the design of thinner battery box walls, thereby reducing weight. This balance solves the problem of high-strength steel material weight to a certain extent, while maintaining the strength and crash resistance of the structure.

[0036] 4. Corrosion resistance and maintainability: Stainless steel has excellent corrosion resistance and can withstand harsh environmental conditions without being easily damaged, reducing maintenance needs and costs. This solves the corrosion problem that may occur when using high-strength steel.

[0037] 5. Sustainability and environmental protection: Stainless steel has a very high recycling rate and recycling value, and is easy to recycle and reuse, which is consistent with environmental protection and sustainability goals. This solves the environmental challenges involved in composite material recycling and high-strength steel surface treatment.

[0038] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a structural schematic diagram of the utility model;

[0041] Figure 2 The utility model Figure 1 Schematic diagram of the reverse structure;

[0042] In the figure, 1, outer frame, 2, longitudinal beam, 3, liquid cooling plate, 4, bottom guard plate, 5, cross beam, 6, end beam, 7, side beam, 8, lifting ear beam, 9, lifting ear sleeve. DETAILED DESCRIPTION

[0043] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] See also Figure 1 and Figure 2 Two parallel longitudinal beams 2 are installed in the outer frame 1 of this high-strength and corrosion-resistant power battery tray. The longitudinal beams 2 play a supporting role to make the entire tray structure firm. The liquid cooling plate 3 is fixed to the outer frame 1 and the longitudinal beams 2 by rivets to achieve fixed installation. The bottom guard plate 4 on the outside of the liquid cooling plate 3 is fixed by the rivet nuts reserved on the frame to achieve fixed installation of the tray structure.

[0045] The longitudinal beam 2 in the outer frame 1 is perpendicular to the cross beam 5, dividing the structure inside the outer frame 1 into multiple areas, which are used to place power batteries or electronic control systems.

[0046] The staggered positions of the longitudinal beams 2 and the transverse beams 5 engage with each other, which improves the overall mechanical structural strength after installation.

[0047] The outer frame 1 is formed by welding two sets of end beams 6 and side beams 7, with an angle of 45° at the welding position. After welding, the structure is stable.

[0048] The end of the cross beam 4 is in a vertical position at the position where it is released from the side beam 7, and is then welded and fixed, thereby increasing the mechanical strength of the entire device.

[0049] The outer side of the side connection 7 is a lifting eye beam 8, and a plurality of lifting eye sleeves 8 on the lifting eye beam 8 are used to connect with the bottom of the vehicle to facilitate subsequent installation.

[0050] The working principle of the utility model is as follows:

[0051] This high-strength and corrosion-resistant power battery tray has a liquid cooling plate 3 made of aluminum alloy stamping and brazing, and the outer frame 1, longitudinal beam 2, cross beam 5, and lug beam 8 are all made of QN1701, QN1803, QN1804, QNI906 or QN2109 stainless steel, which ensures the overall strength while also achieving the purpose of corrosion resistance.

[0052] The outer frame 1 , the longitudinal beam 2 , the cross beam 5 , and the lug beam 8 are all mechanically formed by rolling and then processed by laser cutting.

[0053] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0054] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0055] Finally: The above description is only a preferred implementation mode of the present utility model and is not intended to limit the present utility model. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A high-strength, corrosion-resistant power battery tray, comprising an outer frame (1), characterized in that: Two longitudinal beams (2) are provided in the middle of the outer frame (1), and both ends of the longitudinal beams (2) are in contact with the outer frame (1). The liquid cooling plate (3) is fixedly mounted on the outer frame (1) by means of rivets, and a bottom guard plate (4) is fixed on the outer side of the liquid cooling plate (3). A cross beam (5) is provided inside the outer frame (1) and is perpendicular to the longitudinal beam (2); The longitudinal beams (2) and the cross beams (5) are provided with openings at the intersecting positions thereof for fitting together; The outer frame (1) is composed of end beams (6) at both ends and side beams (7) at both sides, and the end beams (6) and side beams (7) are welded at a 45° angle at the joints. The two ends of the cross beam (5) are vertically welded to the inner side of the side beam (7); A lifting lug beam (8) is welded on the outer side of the side beam (7), and a plurality of lifting lug sleeves (9) are arranged on the lifting lug beam (8); The liquid cooling plate (3) is made of aluminum alloy by stamping and brazing, and the outer frame (1), longitudinal beam (2), cross beam (5) and hanging ear beam (8) are all made of QN1701, QN1803, QN1804, QNI906 or QN2109 stainless steel.

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