Light new energy battery box aluminum alloy shell bottom plate with high safety coefficient

Abstract

The light new energy battery box aluminum alloy shell bottom plate with the high safety coefficient comprises a lower bottom plate, a liquid cooling structure is arranged at the upper end of the lower bottom plate, an upper bottom plate is arranged at the upper end of the liquid cooling structure, and the upper bottom plate and the lower bottom plate are the same in structure; the lower bottom plate comprises an aluminum alloy plate, a honeycomb groove plate is arranged at the upper end of the aluminum alloy plate, and a supporting plate is arranged at the upper end of the honeycomb groove plate. The liquid cooling structure comprises a liquid cooling frame, three sets of same liquid cooling channels are arranged on the inner side of the liquid cooling frame, liquid passing water nozzles are arranged in the centers of the front ends of the liquid cooling channels, limiting rectangular protrusions are arranged in the centers of the liquid cooling channels, the liquid passing water nozzles are connected with the liquid cooling frame in a penetrating mode, circulating grooves are formed in the rear ends of the liquid passing water nozzles, and circulating openings are formed in the rear sides of the lower ends of the circulating grooves. The battery box aluminum alloy shell bottom plate has the advantages that the weight is light, the anti-pressure ability is high, the anti-impact effect is good, the temperature change is monitored in real time, danger sensing is conducted in advance, and the safety coefficient is high.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy battery pack bottom plates, and particularly to an aluminum alloy shell bottom plate for a new energy battery box with high lightness and safety factor. Background Art

[0002] With the rapid development of the electric vehicle and energy storage industries, the demand and performance of new energy batteries have been continuously improved. As the core component of electric vehicles and energy storage industries, the safety, endurance, and charging efficiency of the battery system will directly affect the overall performance and service life of electric vehicles and energy storage systems. With the development of new energy vehicles, the existing new energy battery packs are more in need of extreme performance, requiring high safety factor while reducing weight.

[0003] Patent No. CN202323485077.6 discloses a battery pack lower box body, which includes a bottom plate and a liquid cooling plate; the liquid cooling plate is snap-connected to the bottom plate, and the two enclose a closed cavity; a flow channel cavity is arranged inside the liquid cooling plate, and the flow channel cavity is provided with multiple convex structures for flow distribution; the battery pack lower box body further includes: a strengthening component; the strengthening component is arranged in the cavity; the top of the strengthening component is fixedly connected to the liquid cooling plate, and the bottom is fixedly connected to the bottom plate; the provided battery pack lower box body adopts the integrated structural form of the lower box body and the liquid cooling plate, which can enhance the structural strength and stiffness of the lower box body and the battery pack as a whole, and at the same time can improve the heat exchange efficiency of the liquid cooling plate. However, the following problems exist in this lower box body: firstly, the safety factor is not high and the impact resistance effect is poor; secondly, the structural quality is heavy and it cannot effectively reflect the extreme performance of the vehicle. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art. By setting an upper bottom plate and a lower bottom plate, and using the honeycomb groove plate arranged between the upper bottom plate and the lower bottom plate, the upper and lower bottom plates can have strong impact resistance while reducing the overall weight, and the corrugated buffer belt is used to effectively strengthen the collision-sensitive area, solving the problems of low safety factor, poor impact resistance effect, excessive weight, and inability to pursue the extreme performance of the vehicle in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An aluminum alloy shell bottom plate for a new energy battery box with high lightness and safety factor, including a lower bottom plate, a liquid cooling structure is arranged at the upper end of the lower bottom plate, an upper bottom plate is arranged at the upper end of the liquid cooling structure, and the upper bottom plate and the lower bottom plate have the same structure;

[0007] Lower bottom plate, the lower bottom plate includes an aluminum alloy plate, a honeycomb groove plate is arranged at the upper end of the aluminum alloy plate, and a support plate is arranged at the upper end of the honeycomb groove plate;

[0008] Liquid cooling structure, the liquid cooling structure includes a liquid cooling frame, three identical liquid cooling channels are arranged inside the liquid cooling frame, liquid supply nozzles are arranged at the central positions of the front ends of the liquid cooling channels, and a limiting rectangular protrusion is arranged at the central position of the liquid cooling channels. The liquid supply nozzles penetrate and connect the liquid cooling frame, and circulation grooves are arranged at the rear ends of the liquid supply nozzles. A circulation port is arranged at the rear side of the lower end of the circulation groove, the circulation port communicates with a coolant cavity, and a liquid discharge nozzle is arranged at the rear end of the coolant cavity.

[0009] As a preference, memory alloy embedded eyes are evenly arranged on the surface of the aluminum alloy plate. The honeycomb groove plate includes evenly arranged honeycomb rings. A memory alloy block is arranged at the central position of the honeycomb ring. The memory alloy block is a regular hexagon block, and the support plate is a rectangular aluminum alloy metal plate.

[0010] As a preference, a temperature measurement sensor network is embedded on the outer side of the liquid cooling frame, and the liquid cooling frame is arranged inside between the upper bottom plate and the lower bottom plate. A titanium alloy corrugated buffer belt is arranged on the outer side of the temperature measurement sensor network.

[0011] As a preference, the inner side of the limiting rectangular protrusion is an aluminum alloy support rectangular block. Integrated PVDF piezoelectric film layers with a thickness of 50 μm are arranged on the front, rear, left and right surfaces of the aluminum alloy support rectangular block. A waterproof isolation layer is arranged on the outer side of the integrated PVDF piezoelectric film layer, and the waterproof isolation layer is a nano-aluminum oxide coating.

[0012] As a preference, the liquid supply nozzle is a vertical cylinder, and a reinforcement block is arranged at the rear end of the liquid supply nozzle. The inside of the reinforcement block is hollow and the reinforcement block communicates with the liquid supply nozzle. The rear end of the reinforcement block is fixedly connected to the liquid cooling frame, and the front end of the reinforcement block is exactly flush with the front ends of the upper bottom plate and the lower bottom plate.

[0013] As a preference, the lower end of the circulation groove is hermetically connected to the support plate, and the liquid cooling frame is integrally formed and connected to the lower bottom plate. A coolant cavity is arranged between the lower bottom plate and the liquid cooling channel.

[0014] As a preference, alarm sensor blocks are evenly and fixedly connected to the left side of the liquid cooling frame, and two identical alarm sensor blocks are fixedly connected to the left side of the rear end of the liquid cooling frame. The height of the alarm sensor blocks protrudes above the upper end of the upper bottom plate.

[0015] As a preference, an aluminum alloy plate is arranged at the upper end of the upper bottom plate, and a support plate is arranged at the lower end of the upper bottom plate. The upper bottom plate and the lower bottom plate are placed symmetrically.

[0016] As a preference, a nano-precipitation layer is arranged on the surface of the aluminum alloy plate. An anodic oxidation layer is arranged above the nano-precipitation layer, and an epoxy resin layer is arranged above the anodic oxidation layer.

[0017] As another preference, the nano-precipitation layer comprises 5052 / 5182 aluminum alloy, 0.18-0.25 wt% of scandium (Sc), 0.08-0.12 wt% of zirconium (Zr), and the size of the nano-precipitation layer is less than 30 nm. The thickness of the anodic oxidation layer is 20-30 μm, and the epoxy resin layer is graphene-modified epoxy resin with a thickness of 5-8 μm.

[0018] Advantages of the present invention:

[0019] (1) In the present invention, by providing the honeycomb groove plate and using the honeycomb ring to reduce the weight of the whole aluminum alloy plate, and then using the shape memory alloy block, when the local deformation of the aluminum alloy bottom plate of the battery pack exceeds 3%, the shape recovery is triggered, realizing self-repair of the structure while ensuring lighter overall mass and stronger impact resistance.

[0020] (2) In the present invention, based on 5052 / 5182 aluminum alloy, by adding 0.18-0.25 wt% of scandium (Sc) and 0.08-0.12 wt% of zirconium (Zr), the tensile strength can be increased to more than 420 MPa, and the upper and lower bottom plate substrates are optimized to ensure the overall compressive and tensile resistance.

[0021] (3) In the present invention, by providing the liquid cooling frame and arranging the temperature measuring sensor network in the liquid cooling frame, it is convenient to monitor the temperature change of the liquid cooling channel in real time. Then, the limiting rectangular protrusion can not only ensure the impact resistance of the liquid cooling channel, but also the arranged integrated PVDF piezoelectric film layer can collect the vibration spectrum to identify the collision risk, and connecting to a computer can predict and prevent dangers in advance.

[0022] In summary, the aluminum alloy housing bottom plate has the advantages of light weight, strong compressive ability, good impact resistance effect, real-time monitoring of temperature change, early danger perception, and high safety factor, and is especially suitable for the technical field of the bottom plate of new energy battery packs. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the structure of the limiting rectangular protrusion in the present invention.

[0026] Figure 3 It is a schematic diagram of the structure of the honeycomb groove plate in the present invention.

[0027] Figure 4 This is a schematic structural diagram of the honeycomb ring in the present invention.

[0028] Figure 5 This is a schematic structural diagram of the titanium alloy corrugated buffer belt in the present invention.

[0029] Figure 6 This is a schematic structural diagram of the waterproof isolation layer in the present invention.

[0030] Figure 7 This is a schematic structural diagram of the liquid injection nozzle in the present invention.

[0031] Table 1 is a data detection comparison table between the traditional structure and the present invention. Detailed implementation manners

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] Embodiment 1

[0034] As Figures 1 to 7 shown, the present invention provides an aluminum alloy housing bottom plate for a new energy battery box with high lightness and safety factor, including a lower bottom plate 1. A liquid cooling structure 2 is provided at the upper end of the lower bottom plate 1, and an upper bottom plate 3 is provided at the upper end of the liquid cooling structure 2. The upper bottom plate 3 and the lower bottom plate 1 have the same structure;

[0035] The lower bottom plate 1 includes an aluminum alloy plate 11. A honeycomb groove plate 12 is provided at the upper end of the aluminum alloy plate 11, and a support plate 13 is provided at the upper end of the honeycomb groove plate 12;

[0036] The liquid cooling structure 2 includes a liquid cooling frame 21. Three identical liquid cooling channels 22 are provided inside the liquid cooling frame 21. A liquid injection nozzle 23 is provided at the center position of the front end of each liquid cooling channel 22. A limiting rectangular protrusion 24 is provided at the center position of the liquid cooling channel 22. The liquid injection nozzle 23 penetrates and connects the liquid cooling frame 21, and a circulation groove 25 is provided at the rear end of each liquid injection nozzle 23. A circulation port 26 is provided at the rear side of the lower end of the circulation groove 25. The circulation port 26 communicates with a coolant cavity 27. An outlet liquid nozzle is provided at the rear end of the coolant cavity 27.

[0037] Furthermore, memory alloy embedded eyes 110 are evenly arranged on the surface of the aluminum alloy plate 11. The honeycomb groove plate 12 includes evenly arranged honeycomb rings 121. A memory alloy block 122 is arranged at the central position of the honeycomb ring 121. The memory alloy block 122 is a regular hexagonal block. The support plate 13 is a rectangular aluminum alloy metal plate. The memory alloy embedded eyes 110 are provided to facilitate the placement of the memory alloy blocks 122, ensuring that the entire aluminum alloy plate 11 has stronger anti-deformation ability. Then, the honeycomb rings 121 arranged can not only ensure the compressive ability of the entire aluminum alloy plate 11, but also make the overall quality lighter. When installed on a new energy vehicle body, it can ensure that the overall load is smaller, improving the performance of new energy vehicles faster. Moreover, each honeycomb ring 121 has a fractal design, which can increase its energy absorption and stress dispersion ability, extending the service life of the entire aluminum alloy plate 11.

[0038] Furthermore, a temperature measurement sensor network 211 is embedded on the outer side of the liquid cooling frame 21, and the liquid cooling frame 21 is arranged on the inner side between the upper bottom plate 3 and the lower bottom plate 1. A titanium alloy corrugated buffer belt 212 is arranged on the outer side of the temperature measurement sensor network 211. The temperature measurement sensor network 211 is distributed on the liquid cooling frame 21. Placing the liquid cooling frame 21 between the upper bottom plate 3 and the lower bottom plate 1 can not only effectively monitor the temperature change of the entire housing bottom plate, but also reduce impact. The temperature measurement sensor network 211 can monitor the strain and temperature field distribution in real time, improving the use safety of the housing bottom plate. Then, the titanium alloy corrugated buffer belt 212 is arranged, and the thickness of the titanium alloy corrugated buffer belt is controlled within 0.3 - 0.5 mm, thereby realizing the three-stage dissipation of the side impact energy, ensuring the side anti-impact ability, and improving the service life of the overall battery box housing bottom plate.

[0039] Furthermore, the inner side of the limiting rectangular protrusion 24 is an aluminum alloy support rectangular block 241. Integrated PVDF piezoelectric film layers 242 with a thickness of 50 μm are arranged on the front, back, left, and right surfaces of the aluminum alloy support rectangular block 241. A waterproof isolation layer 243 is arranged on the outer side of the integrated PVDF piezoelectric film layer 242. The waterproof isolation layer 243 is a nano-aluminum oxide coating. The integrated PVDF piezoelectric film layer 242 uses vibration spectrum characteristics to identify the collision risk by using the vibration spectrum characteristics, ensuring a higher overall safety factor.

[0040] Furthermore, the liquid supply nozzle 23 is a vertical cylinder, and a reinforcing block 231 is provided at the rear end of the liquid supply nozzle 23. The inside of the reinforcing block 231 is hollow, and the reinforcing block 231 communicates with the liquid supply nozzle 23. The rear end of the reinforcing block 231 is fixedly connected to the liquid cooling frame 21, and the front end of the reinforcing block 231 is exactly flush with the front ends of the upper bottom plate 3 and the lower bottom plate 1. Setting the liquid supply nozzle 23 as a vertical cylinder can well save the occupied space of the bottom plate of the whole housing, thereby saving the height of the battery box and facilitating the exterior design of the new energy vehicle to better conform to aerodynamics. Then the function of the reinforcing block 231 is to seal and connect the liquid supply nozzle 23 to ensure that the whole liquid cooling channel 22 can be more sealed and space-saving.

[0041] Furthermore, the lower end of the circulation groove 25 is hermetically connected to the support plate 13, and the liquid cooling frame 21 is integrally formed with the lower bottom plate 1. A coolant cavity 27 is provided between the lower bottom plate 1 and the liquid cooling channel 22. The setting of the circulation groove 25 facilitates the circulation of the coolant, thereby ensuring the liquid cooling effect of the bottom plate of the whole battery box housing and ensuring that the temperature of the whole battery box is controllable during operation. Moreover, by setting the coolant cavity 27 at the lower end of the liquid cooling channel 22 and the upper end of the lower bottom plate 1, such an operation not only has a low mold opening cost, but also the liquid cooling frame 21 and the lower bottom plate 1 are integrally formed with good sealing effect, and there is no need to drill holes in the position of the internal structural ribs of the liquid cooling frame 21, thus affecting the integrity of the structure of the whole liquid cooling frame 21.

[0042] Furthermore, alarm sensor blocks 213 are uniformly and fixedly connected to the left side of the liquid cooling frame 21, and two identical alarm sensor blocks 213 are fixedly connected to the left side of the rear end of the liquid cooling frame 21. The height of the alarm sensor blocks 213 protrudes above the upper bottom plate 3. The alarm sensor blocks 213 are for facilitating the passage of lines through the alarm sensor blocks 213, preventing the lines from being exposed outside and directly breaking after being impacted, so that the alarm operation cannot be carried out. The alarm sensor blocks 213 are connected to the temperature measurement sensor network 211 and are also electrically connected to the limit rectangular protrusion 24, and can effectively collect vibration spectra and temperature change curves, facilitating comparative monitoring, with high efficiency, real-time performance and high safety factor;

[0043] An initial warning and a secondary power-off program are set in the alarm sensor blocks 213. When the temperature detection is greater than 65 °C during the initial warning, the sound and light alarm module is triggered. Among them, the sound and light alarm module is connected to the main system of the new energy vehicle. The secondary power-off program is to automatically cut off the battery circuit when the temperature gradient suddenly exceeds 20 °C.

[0044] Furthermore, an aluminum alloy plate 11 is provided at the upper end of the upper bottom plate 3, and a support plate 13 is provided at the lower end of the upper bottom plate 3. The upper bottom plate 3 and the lower bottom plate 1 are placed symmetrically. Both the upper and lower bottom plates adopt the structural distribution of the aluminum alloy plate 11, the honeycomb groove plate 12, and the support plate 13, and then are symmetrically arranged to ensure that the shape memory alloy embedded eyes 110 can all be exposed on the outside, facilitating the embedding of the shape memory alloy block 122 and saving the process cost.

[0045] Furthermore, a nano-precipitation layer 111 is provided on the surface of the aluminum alloy plate 11. An anodic oxidation layer 112 is provided on the upper end of the nano-precipitation layer 111, and an epoxy resin layer 113 is provided on the upper end of the anodic oxidation layer 112. Setting a coating on the upper end of the aluminum alloy plate 11 can improve the overall tensile strength and ensure the corrosion resistance of the matrix alloy.

[0046] Furthermore, the nano-precipitation layer 111 includes 5052 / 5182 aluminum alloy, 0.18 - 0.25 wt% of scandium (Sc), zirconium (Zr) accounting for 0.08 - 0.12 wt%, and the size of the nano-precipitation layer is less than 30 nm. The thickness of the anodic oxidation layer 112 is 20 - 30 μm, and the epoxy resin layer 113 is graphene-modified epoxy resin with a thickness of 5 - 8 μm. Based on the 5052 / 5182 aluminum alloy, adding Sc (0.18 - 0.25 wt%) and Zr (0.08 - 0.12 wt%) forms Al3(Sc,Zr) nano-precipitation phase (size < 30 nm), and the tensile strength can be increased to more than 420 MPa. The anodic oxidation layer 112 (20 - 30 μm) + graphene-modified epoxy resin (5 - 8 μm) can increase the salt spray corrosion resistance time of the matrix alloy to more than 2000 hours; the improved data comparison table is as follows:

[0047] Index Traditional structure The present invention Quality (equal strength) Reference value Reduce by 41% Flexural rigidity (3000 N·m) Reference value Increase by 60% Thermal runaway propagation time ≤ 8 minutes ≥ 18 minutes Corrosion resistance (salt spray test) 1000 hours > 2000 hours

[0048] Table 1

[0049] Working process: First, place the shape memory alloy block 122 in the middle of the honeycomb ring 121, and then fixedly connect the aluminum alloy plate and the support plate 13 at the upper and lower ends respectively. The shape memory alloy block 122 adopts a hexagonal structure to ensure strong compressive capacity and form an impact-resistant structure with the honeycomb ring 121. The overall quality is light, the bending stiffness is large, and when the local deformation of the shape memory alloy block 122 exceeds 3%, it can trigger shape recovery, realizing structural self-repair and having a longer service life;

[0050] Then, a liquid-cooled frame 21 is provided thereon, and a temperature measurement sensor network 211 is arranged outside the liquid-cooled frame 21 to monitor the temperature change in real time. Then, a titanium alloy corrugated buffer belt 212 is arranged outside the temperature measurement sensor network 211 to ensure strong impact resistance on the side of the entire liquid-cooled frame 21. The setting of the liquid-cooled channel 22 can not only save the mold opening cost but also ensure strong overall sealing performance, so that the coolant cavity 27 is arranged at the lower end of the liquid-cooled channel 22 and the upper end of the lower bottom plate 1. Then, the entire liquid-cooled frame 21 and the lower bottom plate 1 are integrally formed, and a circulation groove 25 is used for the circulating flow of the coolant, and the cooling effect of the entire liquid-cooled channel 22 is good.

[0051] The provided limiting rectangular protrusion 24 can not only prevent the liquid-cooled channel 22 from deforming and causing a deterioration in the cooling effect but also collect the internal vibration spectrum to improve the overall safety factor. The aluminum alloy housing bottom plate of the entire battery box is light in weight and has high-strength impact resistance. The fractal design of the honeycomb ring 121 can increase the energy recovery and stress dispersion capabilities, and the overall safety factor is higher, making it more suitable for being placed in the field of high-performance new energy electric vehicles.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "front and back", "left and right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0053] Of course, in this technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of one element can be one, while in other embodiments, the number of this element can be multiple. The term "one" should not be construed as a limitation on the number.

[0054] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art under the technical disclosure of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An aluminum alloy housing bottom plate for a new energy battery box with high lightness and high safety factor, characterized in that: It includes a lower bottom plate (1), a liquid cooling structure (2) is provided at the upper end of the lower bottom plate (1), an upper bottom plate (3) is provided at the upper end of the liquid cooling structure (2), and the upper bottom plate (3) and the lower bottom plate (1) have the same structure; The lower bottom plate (1), the lower bottom plate (1) includes an aluminum alloy plate (11), a honeycomb groove plate (12) is provided at the upper end of the aluminum alloy plate (11), and a support plate (13) is provided at the upper end of the honeycomb groove plate (12); The liquid cooling structure (2), the liquid cooling structure (2) includes a liquid cooling frame (21), three identical liquid cooling channels (22) are provided inside the liquid cooling frame (21), a liquid passing nozzle (23) is provided at the center position of the front end of each liquid cooling channel (22), and a limiting rectangular protrusion (24) is provided at the center position of the liquid cooling channel (22). The liquid passing nozzle (23) penetrates and connects to the liquid cooling frame (21), and a circulation groove (25) is provided at the rear end of each liquid passing nozzle (23). A circulation port (26) is provided at the rear side of the lower end of the circulation groove (25), the circulation port (26) communicates with a coolant cavity (27), and a liquid outlet nozzle is provided at the rear end of the coolant cavity (27).

2. The aluminum alloy housing bottom plate of a new energy battery box with a light weight and high safety factor according to claim 1, characterized in that, Memory alloy embedded eyes (110) are evenly provided on the surface of the aluminum alloy plate (11). The honeycomb groove plate (12) includes evenly arranged honeycomb rings (121), a memory alloy block (122) is provided at the center position of the honeycomb ring (121), the memory alloy block (122) is a regular hexagon block, and the support plate (13) is an aluminum alloy metal rectangular plate.

3. The aluminum alloy housing bottom plate of a new energy battery box with high lightness and high safety factor according to claim 1, characterized in that, A temperature measurement sensor network (211) is embedded on the outer side of the liquid cooling frame (21), and the liquid cooling frame (21) is arranged on the inner side between the upper bottom plate (3) and the lower bottom plate (1). A titanium alloy corrugated buffer belt (212) is provided on the outer side of the temperature measurement sensor network (211).

4. The aluminum alloy housing bottom plate of a new energy battery box with high lightness and high safety factor according to claim 1, characterized in that, The inner side of the limiting rectangular protrusion (24) is an aluminum alloy support rectangular block (241). Integrated PVDF piezoelectric film layers (242) with a thickness of 50 μm are provided on the front, rear, left, and right surfaces of the aluminum alloy support rectangular block (241). A waterproof isolation layer (243) is provided on the outer side of the integrated PVDF piezoelectric film layer (242), and the waterproof isolation layer (243) is a nano-aluminum oxide coating.

5. A bottom plate of an aluminum alloy housing for a new energy battery box with high lightness and high safety factor according to claim 1, characterized in that The liquid passing nozzle (23) is a vertical cylinder, and a reinforcing block (231) is provided at the rear end of the liquid passing nozzle (23). The inside of the reinforcing block (231) is hollow and communicates with the liquid passing nozzle (23). The rear end of the reinforcing block (231) is fixedly connected to the liquid cooling frame (21), and the front end of the reinforcing block (231) is exactly flush with the front ends of the upper bottom plate (3) and the lower bottom plate (1).

6. The aluminum alloy housing bottom plate of the new energy battery box with high lightness and high safety factor according to claim 1, wherein The lower end of the circulation groove (25) is hermetically connected to the support plate (13), and the liquid cooling frame (21) is integrally formed and connected to the lower bottom plate (1). A coolant cavity (27) is provided between the lower bottom plate (1) and the liquid cooling channel (22).

7. A bottom plate of an aluminum alloy housing for a new energy battery box with high lightness and safety factor, characterized in that, An alarm sensor block (213) is fixedly connected to the left side of the liquid-cooled frame (21) evenly, and two identical alarm sensor blocks (213) are fixedly connected to the left side of the rear end of the liquid-cooled frame (21). The height of the alarm sensor block (213) protrudes above the upper bottom plate (3).

8. The aluminum alloy housing bottom plate of a new energy battery box with high lightness and high safety factor according to claim 1, characterized in that, An aluminum alloy plate (11) is provided on the upper end of the upper bottom plate (3), and a support plate (13) is provided on the lower end of the upper bottom plate (3). The upper bottom plate (3) and the lower bottom plate (1) are placed symmetrically.

9. The aluminum alloy housing bottom plate of a new energy battery box with high lightness and high safety factor according to claim 1, characterized in that, A nano-precipitation layer (111) is provided on the surface of the aluminum alloy plate (11). An anodic oxidation layer (112) is provided on the upper end of the nano-precipitation layer (111). An epoxy resin layer (113) is provided on the upper end of the anodic oxidation layer (112).

10. The aluminum alloy housing bottom plate of a new energy battery box with high lightness and high safety factor according to claim 9, characterized in that, The nano-precipitation layer (111) comprises 5052 / 5182 aluminum alloy, 0.18 - 0.25 wt% of scandium (Sc), zirconium (Zr) accounting for 0.08 - 0.12 wt%, and the size of the nano-precipitation layer is less than 30 nm. The thickness of the anodic oxidation layer (112) is 20 - 30 μm. The epoxy resin layer (113) is graphene-modified epoxy resin with a thickness of 5 - 8 μm.

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