A lithium-ion battery shell plate capable of being rapidly cooled and a preparation method thereof

Abstract

The present invention proposes a lithium-ion battery shell plate that can be quickly cooled and a preparation method thereof. The shell plate includes an aluminum alloy micro-column array plate and an Al2O3 fiber membrane. The aluminum alloy micro-column array plate includes a bottom plate and a plurality of micro-columns arranged in a rectangular array on the bottom plate. A U-shaped channel is provided on the top of the bottom plate between two adjacent micro-columns. The Al2O3 fiber membrane is arranged on the bottom plate, and the Al2O3 fiber membrane covers the U-shaped channel. An electric spark wire cutting machine is used to cut and form an aluminum alloy micro-column array plate. A porous nanofiber membrane is formed by electrospinning and calcination. Multiple layers of porous nanofiber membranes are stacked and pressed to form the required Al2O3 fiber membrane, and then the Al2O3 fiber membrane is embedded in the aluminum alloy micro-column array plate using a mold. The present invention can reduce the influence of the application time on the fire extinguishing and cooling effect, quickly cool the lithium-ion battery that has undergone thermal runaway, effectively prevent re-ignition and save the amount of fire extinguishing agent. Rapid disaster control is achieved to reduce the loss of life and property.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery fire protection, and in particular to a lithium ion battery shell plate capable of being quickly cooled and a preparation method thereof. Background Art

[0002] Lithium-ion battery fire is one of the major hidden dangers of fire, and it remains a challenge to quickly and effectively suppress lithium-ion battery fires. Unlike typical fires, the main cause of lithium-ion battery fires is the exothermic reaction between the internal components of the battery, and these reactions do not require external oxygen. Once thermal runaway occurs, the temperature of the lithium-ion battery will show a rapid increase, and the heat will be fully released within seconds, and its maximum temperature can usually reach above 600°C. The suppression of thermal runaway of lithium-ion batteries can be divided into two parts: extinguishing the open flame and cooling it down. The key to completely extinguishing the open flame and preventing it from reigniting is to cool the battery.

[0003] At present, when lithium-ion batteries catch fire, the only way to control the fire is through external fire extinguishing and cooling. Among them, water and fine water mist show excellent effects in cooling, but the suppression effect of thermal runaway is greatly affected by the timing of water or water mist application. Studies have shown that the suppression effect is best when applied in the early stage of thermal runaway incubation. However, due to the immaturity of early warning of thermal runaway at this stage, fire extinguishing and cooling work usually occurs after thermal runaway occurs, and the surface temperature of the battery has risen rapidly after thermal runaway. According to the boiling heat transfer theory, when water droplets boil and exchange heat on a heating surface with a temperature higher than the boiling point, they will experience nucleate boiling (or bubble boiling), transition boiling and film boiling in sequence as the surface temperature rises. Among them, during nucleate boiling, bubbles are continuously generated, enlarged and detached in time at the vaporization core of the wall, the disturbance near the wall is enhanced, and the heat exchange process is strengthened. Therefore, the temperature and pressure of this boiling state are small, and the heat transfer effect is the strongest. When the temperature reaches the temperature corresponding to the critical heat flux density, the coolant will experience transition boiling and film boiling. The part of the liquid in contact with the wall will instantly boil and vaporize, forming a continuous vapor film layer between the solid and the liquid. The vapor film layer will greatly increase the thermal resistance, and at the same time will generate kinetic energy that causes the contact droplets to rebound, preventing the liquid from fully contacting the surface, thereby greatly reducing the heat transfer efficiency at high temperatures. If the battery surface temperature is too high, the transition boiling and film boiling will increase. At this time, water or water mist cannot quickly reduce the battery temperature after application, and the fire extinguishing and cooling effect is greatly reduced. It often takes a lot of time and fire extinguishing agents to carry out fire extinguishing and cooling work, and the battery may reignite. Therefore, a lithium-ion battery housing that can efficiently cool thermal runaway battery modules and suppress thermal runaway is needed. Summary of the invention

[0004] In order to solve the problems existing in the background technology, the present invention proposes a lithium-ion battery shell plate that can be quickly cooled, including an aluminum alloy micro-column array plate and an Al2O3 fiber membrane. The aluminum alloy micro-column array plate includes a base plate and a plurality of micro-columns arranged in a rectangular array on the base plate, a U-shaped channel is opened on the top of the base plate between two adjacent micro-columns, the Al2O3 fiber membrane is arranged on the base plate, and the Al2O3 fiber membrane covers the U-shaped channel.

[0005] Preferably, the cross section of the microcolumn is square, the width of the microcolumn is 300µm-500µm, the height of the microcolumn and the distance between two adjacent microcolumns are equal to the width of the microcolumn, and the longitudinal cross section of the U-shaped channel is semicircular, and the diameter of the semicircle is 300µm-500µm;

[0006] The thickness of the Al2O3 fiber membrane is 90-110µm, and the average pore size of the Al2O3 fiber membrane is 3-5µm;

[0007] The bottom plate has a thickness of 1-1.2 mm.

[0008] A method for preparing a lithium-ion battery housing plate that can be quickly cooled comprises the following steps:

[0009] S1, using an electric spark wire cutting machine to cut the aluminum alloy workpiece according to the required micro-column parameters by programming and controlling the electrode wire to make an aluminum alloy micro-column array plate;

[0010] S2. Using aluminum source, catalyst, pore-forming agent and spinning aid as materials, a nanofiber membrane is prepared by electrospinning, the nanofiber membrane is calcined to form a porous nanofiber membrane, and a multi-layer porous nanofiber membrane is stacked and pressed to form an Al2O3 fiber membrane with a desired thickness and pore size;

[0011] S3. Use a mold to embed the prepared Al2O3 fiber membrane into the aluminum alloy micro-column array plate at a desired depth, where the desired depth is the micro-column height, and then sinter at a high temperature to solidify the Al2O3 fiber membrane to obtain a battery shell plate.

[0012] Preferably, the microcolumn parameters described in step S1 include the number of microcolumns in the array, the width of the microcolumns, the height of the microcolumns, the depth of the U-shaped channel, and the spacing between two adjacent microcolumns. The diameter of the electrode wire is the same as the diameter of the U-shaped channel. The current, voltage and processing compensation required for processing are adjusted before cutting. After adjustment, the electrode wire starts to cut the aluminum alloy workpiece.

[0013] Preferably, the mold described in step S3 is a plate-like structure with an array of square holes, the number and distribution positions of the square holes in the array of square holes correspond one-to-one to the multiple microcolumns in the aluminum alloy microcolumn array plate, the cross-section of the square holes in the array of square holes is square, the aperture of the square hole is larger than the width of the microcolumn, and correspondingly, the spacing between two adjacent square holes is smaller than the spacing between two adjacent microcolumns, and the thickness of the mold is equal to the height of the microcolumn;

[0014] The specific steps of embedding the Al2O3 fiber membrane into the aluminum alloy micro-pillar array plate are as follows: laying the prepared Al2O3 fiber membrane flat on the top of the array micro-pillars in the aluminum alloy micro-pillar array plate, aligning the array square holes of the mold with the array micro-pillars, and then pressing down the mold to allow the micro-pillars to enter the square holes.

[0015] Preferably, the mold is made of antistatic plastic material, the mold is prepared by a precision CNC milling machine, and the milling machine drill bit is a Lello triangle-shaped drill bit.

[0016] Preferably, the diameter of the square hole is 10-30 μm larger than the width of the microcolumn, and correspondingly, the distance between two adjacent square holes is 20-60 μm smaller than the distance between two adjacent microcolumns.

[0017] The beneficial effects of the present invention are as follows: when the outer shell plate of the present invention is used to make a lithium-ion battery outer shell, when the battery temperature is higher than the normal operating temperature, external forced air cooling is started, and the U-shaped channel can be used as an air cooling channel to make the cooling gas flow more smoothly; when the battery module needs to be used, the top surfaces of the micro-columns on the battery shells of two adjacent batteries are in contact, and the micro-columns of the two battery shells are spaced apart to form an air circulation channel, which can also be used as an air cooling channel to improve the smoothness of the cooling gas.

[0018] At the same time, the shell plate structure described in the present invention can increase the specific surface area of ​​the single battery or battery module, so that the battery is fully in contact with the air or air-cooled medium, so that the heat dissipation effect is better, and it is also conducive to the full contact between the fire extinguishing medium such as the coolant and the thermal runaway battery. When the battery monomer or battery module is arranged in contact, the contact area between the batteries can be reduced, thereby relatively reducing the transfer of heat, and the Al2O3 fiber membrane with low thermal conductivity can inhibit the spread of thermal runaway to a certain extent.

[0019] The lithium-ion battery shell manufactured by the shell plate of the present invention still has a good heat conduction effect at high temperature and can effectively suppress the propagation of thermal runaway. When the lithium-ion battery shell is cooled by cooling droplets such as water or water mist, the lithium-ion battery shell can separate the cooling droplets from the evaporation film layer formed by evaporation, avoid the generation of transition boiling and film boiling that affect heat transfer, ensure that the cooling droplets fully infiltrate the shell surface, improve the cooling efficiency of the cooling droplets, thereby reducing the fire extinguishing cooling time and saving the amount of fire extinguishing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a side schematic diagram of the shell plate structure of the present invention;

[0021] Figure 2 It is a three-dimensional schematic diagram of the shell plate structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the mold structure of the present invention;

[0023] Figure 4 This is a disassembled diagram of the battery module housing structure of the present invention;

[0024] Figure 5 This is a data comparison diagram of the housing of the present invention and a traditional aluminum alloy housing;

[0025] Figure 6 A schematic diagram of an air flow channel formed by two shell plate structures in close contact in the present invention;

[0026] Figure 7 It is a bottom-up stereoscopic schematic diagram of a power battery box base of an electric vehicle according to the present invention;

[0027] Figure 8 This is a bottom view of the power battery box base of the electric vehicle according to the present invention;

[0028] Fig. 9 The figure is a schematic diagram of the body floor structure of the electric vehicle according to the present invention.

[0029] Numbers in the figure: 1-aluminum alloy micro-column array plate, 2-Al2O3 fiber membrane, 3-U-shaped channel, 4-square hole, 5-mold, 6-upper cover, 7-base frame, 8-end plate, 9-air circulation channel, 10-base bottom plate, 11-base body, 12-battery module, 13-node plate, 14-screw hole, 15-mounting hole, 16-base plate, 17-micro-column. DETAILED DESCRIPTION

[0030] In order to make the present invention clearer and more understandable, the technical solution of the present invention is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the given embodiment is only one implementation method and does not represent all embodiments.

[0031] Combined with Figure 1-9A lithium-ion battery shell plate that can be quickly cooled down includes an aluminum alloy micro-column array plate 1 and an Al2O3 fiber membrane 2. The aluminum alloy micro-column array plate 1 is used to act as a thermal bridge and plays a major role in heat transfer. The aluminum alloy micro-column array plate 1 includes a bottom plate 16 and a plurality of micro-columns 17 arranged in a rectangular array on the bottom plate 16. A U-shaped channel 3 is provided on the top of the bottom plate 16 between two adjacent micro-columns 17. The U-shaped channel 3 is used to discharge steam generated by instantaneous boiling when cooling droplets contact the hot surface of a thermal runaway battery shell. The U-shaped channel 3 can also be used as a cold air channel. The Al2O3 fiber membrane 2 is arranged on the bottom plate 16, and the Al2O3 fiber membrane 2 covers the U-shaped channel 3. The array micro-columns provide support for the Al2O3 fiber membrane 2. The Al2O3 fiber membrane 2 is resistant to high temperatures, has a low thermal conductivity, and can be recycled. The Al2O3 fiber membrane 2 is used to absorb and diffuse cooling droplets.

[0032] Specifically, the cross section of the microcolumn 17 is square, the width of the microcolumn 17 is 300µm-500µm, the height of the microcolumn 17 and the distance between two adjacent microcolumns 17 are equal to the width of the microcolumn 17, and the longitudinal cross section of the U-shaped channel 3 is semicircular, and the diameter of the semicircle is 300µm-500µm;

[0033] The thickness of the Al2O3 fiber membrane 2 is 90-110µm, and the average pore size of the Al2O3 fiber membrane 2 is 3-5µm;

[0034] The bottom plate 16 has a thickness of 1-1.2 mm.

[0035] According to boiling heat transfer theory, the micro-columns 17 and the U-shaped channel 3 can work together to provide a vaporization core point for the nucleate boiling of the cooling liquid droplets. The vaporization core point is the location where bubbles can be generated on the heating surface. The heating area of ​​the liquid on the top surface of the micro-columns 17 and in the intervals between the micro-columns 17 in the present invention is much larger than the heating area of ​​the same amount of liquid on a smooth flat surface. In addition, it is easier for gas to remain between the micro-columns 17 and in the U-shaped channel, and the residual gas naturally becomes the core for generating bubbles. This ensures that when the cooling liquid acts on the shell structure made of the shell plate of the invention, it is easier to cause nucleate boiling with strong heat transfer, further strengthening boiling heat transfer.

[0036] A method for preparing a lithium-ion battery housing plate that can be quickly cooled comprises the following steps:

[0037] S1, using an electric spark wire cutting machine to cut the aluminum alloy workpiece according to the required micro-column 17 parameters by programming and controlling the electrode wire to make an aluminum alloy micro-column array plate 1;

[0038] S2, using aluminum source, catalyst, pore-forming agent and spinning aid as materials, preparing nanofiber membrane by electrospinning method, forming porous nanofiber membrane by calcining, and forming Al2O3 fiber membrane 2 with required thickness and pore size by stacking and pressing multiple layers of porous nanofiber membranes;

[0039] S3, using a mold 5 to embed the prepared Al2O3 fiber membrane 2 into the aluminum alloy micro-pillar array plate 1 at a desired depth, where the desired depth is the height of the micro-pillars 17, and then sintering at a high temperature to solidify the Al2O3 fiber membrane 2 to obtain a battery housing plate.

[0040] Specifically, the parameters of the microcolumns 17 described in step S1 include the number of microcolumns in the array, the width of the microcolumns 17, the height of the microcolumns 17, the depth of the U-shaped channel 3, and the spacing between two adjacent microcolumns 17. The depth of the U-shaped channel 3 is the radius of the U-shaped channel 3, that is, the diameter of the electrode wire is the same as the diameter of the U-shaped channel 3. The electrode wire can be selected from molybdenum wire. Before cutting, the current, voltage and processing compensation required for processing are adjusted. After adjustment, the electrode wire starts to cut the aluminum alloy workpiece. After the aluminum alloy workpiece is cut continuously for several times in one direction, a row of U-shaped channels 3 is obtained. The workpiece is then rotated 90° and the average continuous cutting is repeated several times. The number of cutting times and depth are determined according to the actual required microcolumn parameters. Each time the electrode wire cuts, it is cut vertically downward from the top surface of the aluminum alloy workpiece.

[0041] Specifically, the mold 5 described in step S3 is a plate-like structure with an array of square holes. The number and distribution positions of the square holes 4 in the array of square holes correspond one-to-one to the multiple micropillars 17 in the aluminum alloy micropillar array plate 1. The cross-section of the square holes 4 in the array of square holes is square. The aperture of the square hole 4 is larger than the width of the micropillar 17. Correspondingly, the spacing between two adjacent square holes 4 is smaller than the spacing between two adjacent micropillars 17, ensuring that the micropillar 17 can just penetrate the square hole 4. The thickness of the mold 5 is equal to the height of the micropillar 17.

[0042] The specific steps of embedding the Al2O3 fiber membrane 2 into the aluminum alloy microcolumn array plate 1 are as follows: lay the prepared Al2O3 fiber membrane 2 flat on the top of the array microcolumns in the aluminum alloy microcolumn array plate 1, align the array square holes of the mold 5 with the array microcolumns, and then press down the mold 5 to allow the microcolumns 17 to enter the square holes 4.

[0043] Specifically, the mold 5 is made of antistatic plastic material, and the mold 5 is prepared by a precision CNC milling machine, and the drill bit of the milling machine is a drill bit in the shape of a Lello triangle.

[0044] Specifically, the diameter of the square hole 4 is 10-30 μm larger than the width of the microcolumn. Correspondingly, the distance between two adjacent square holes 4 is 20-60 μm smaller than the distance between two adjacent microcolumns 17 .

[0045] The prepared lithium-ion battery shell plate is welded by laser welding technology to form a lithium-ion battery shell, wherein the side of the shell plate with the array micro-columns faces outward, and the bottom of the bottom plate 16 faces inward and is close to the internal battery cell.

[0046] The battery shell structure prepared by using the shell plate of the present invention has a cooling method that: when thermal runaway occurs, water or fine water mist is applied externally to extinguish the fire and cool down. After the droplets contact the shell structure, the aluminum alloy micro-column array plate 1 changes the roughness of the battery shell surface. Compared with the smooth and flat surface, the diffusion of droplets will be affected by the friction provided by the array micro-columns themselves, which reduces the diffusion radius and thus reduces the kinetic energy accumulated by the droplet rebound. At the same time, the Al2O3 fiber membrane 2 will provide wicking force to absorb and diffuse the droplets and confine the liquid within the fiber membrane.

[0047] The steam generated by the evaporation of the droplets is discharged in time through the U-shaped channel 3. The steam in the U-shaped channel 3 will generate upward pressure to ensure that the liquid in the Al2O3 fiber membrane 2 will not be immersed in the U-shaped channel 3. While ensuring the unobstructed flow of the U-shaped channel 3, the liquid will be better confined in the Al2O3 fiber membrane 2 and fully contact and exchange heat with the micro-column 17.

[0048] As a result, the various structural parts of the battery shell plate work together to separate the cooling droplets from the steam film layer formed by evaporation, avoid the generation of transition boiling and film boiling that affect heat transfer, ensure that the liquid fully infiltrates the surface of the shell, improve the cooling efficiency of the droplets, thereby reducing the fire extinguishing cooling time and saving the amount of fire extinguishing agent.

[0049] Furthermore, the battery housing structure prepared using the housing plate of the present invention can produce an additional effect that is beneficial to the thermal management of the battery.

[0050] When multiple battery shells are arranged in contact with each other, the tops of the micro-pillars 17 of two adjacent shells are in contact with each other, and the intervals between the micro-pillars 17 will form multiple air circulation channels 9. When the battery temperature is higher than the normal operating temperature, the external forced air cooling is started, and the air circulation channels 9 can be used as air cooling channels to make the cooling gas flow smoother;

[0051] The battery shell structure increases the specific surface area of ​​the single battery or battery module, so that the shell is fully in contact with the air or air-cooled medium, etc., making the heat dissipation effect better. When the battery cells or battery modules are arranged in contact, the contact area between the batteries can be reduced, thereby relatively reducing the heat transfer, and the Al2O3 fiber membrane 2 with low thermal conductivity can inhibit the propagation of thermal runaway to a certain extent.

[0052] It should be noted that when the present invention is used to make a single battery housing, the cooling effect of applying a fire extinguishing agent is the best; when used to make a module housing, the internal battery cell needs to be in direct contact with the inner wall of the housing (the inner wall of the housing is the bottom end of the bottom plate 16) to improve the heat conduction efficiency.

[0053] The application of the present invention can increase the Leidenfrost point on the battery surface to above the peak temperature point of thermal runaway of the battery, effectively avoiding transition boiling and film boiling, and ensuring that it can still be cooled efficiently at high temperatures, thereby reducing the influence of the timing of coolant application on the cooling effect.

[0054] Specifically, refer to Figure 4 The present invention provides a battery module housing, including an upper cover 6, an end plate 8 and a bottom frame 7. The upper cover 6 is in an inverted U shape, and there are two end plates 8. The two end plates 8 are respectively connected to the two ends of the upper cover 6, and the bottom frame 7 is connected to the bottom of the upper cover 6. The disassembly diagram of the battery module housing is shown in FIG. Figure 4 , which can be used as the shell of various types of battery modules, preferably soft-pack batteries, wherein the upper cover 6 and the two side end plates 8 all use the shell plate structure provided by the present invention. In order to facilitate vertical placement, the bottom frame 7 uses ordinary smooth aluminum alloy.

[0055] The size of the module shell depends on the size of the internal battery cell. Taking the soft-pack battery as an example, the soft-pack battery is arranged horizontally so that the side with a larger area of ​​the soft-pack battery is in full contact with the side wall of the upper cover 6 to improve the heat exchange efficiency.

[0056] When a lithium-ion battery experiences thermal runaway, a cooling liquid is applied externally to extinguish the fire and reduce the temperature. The coolant is preferably water or fine water mist. The coolant droplets cool the internal battery cells by cooling the battery casing, thereby suppressing thermal runaway.

[0057] Compare the cooling performance of the battery module housing with that of the traditional aluminum alloy housing and the battery thermal runaway suppression test data for reference Figure 5 The battery module housing provided by the present invention has significant improvements in cooling rate, cooling time and amount of fire extinguishing agent used.

[0058] refer to Figure 7 , Figure 8 and Fig. 9 The present invention also provides an electric vehicle power battery box and its matching body bottom plate in view of the characteristics of electric vehicle fire accidents in recent years. Due to the flexible location of electric vehicles, it is impossible to set up a fixed automatic fire extinguishing device. After thermal runaway occurs, the temperature will rise sharply in a short period of time and the propagation speed is relatively fast. It takes a certain amount of time for firefighters to arrive at the scene, resulting in the battery box temperature being too high when water or fine water mist is applied. When the droplets contact the high-temperature surface, excessive boiling and film boiling occur, causing the cooling efficiency to decrease, the cooling time to become longer, and the amount of fire extinguishing agent used to increase.

[0059] The traditional electric vehicle power battery box is placed inside the vehicle body floor, and has no direct contact with the outside world. The fire extinguishing agent applied from the outside world cannot directly contact the battery box. To address the above problems, an electric vehicle power battery box and its matching vehicle body floor are provided. The specific implementation scheme is as follows:

[0060] See also Figure 7 and Figure 8 A power battery box base comprises a base body 11, a base bottom plate 10, a battery module 12 in the battery box, a node plate 13 connected by bolts and screw holes 14. The bottom surface of the base body 11 is connected to the top surface of the base bottom plate 10. The battery module 12 is installed on the top surface of the base body 11. The bottom surface of the base bottom plate 10 adopts the shell plate structure described in the present invention. The surrounding wall of the base body 11 is provided with a node plate 13, and the node plate 13 is provided with screw holes 14.

[0061] See also Fig. 9 , a body floor of an electric vehicle used in conjunction with a power battery box base, comprising a floor assembly 16 and a battery box mounting hole 15, and a screw hole 14 is also provided on the floor assembly 16 around the battery box mounting hole 15, and the screw holes 14 on the floor assembly 16 correspond to the screw holes 14 on the power battery box base. The battery box of the floor assembly 16 of the electric vehicle is cut with a mounting hole 15 of the same size as the battery box base, and the power battery box base is fixed to the mounting hole 15 by bolts and nuts, and then welded and reinforced after being fixed. The power battery box base and the body floor of the car form a whole, and the bottom surface of the power battery box base is in direct contact with the air, that is, the bottom surface of the base bottom plate 10 is not covered by the body floor. When the lithium-ion battery in the battery box has thermal runaway, the fire can be extinguished and cooled by using a water gun or a fire extinguisher to apply cooling liquid to the battery box position at the bottom of the electric vehicle, and the fire extinguishing and cooling effect is good and the efficiency is fast. The cooling liquid is preferably water or fine water mist.

[0062] The above embodiments are only to illustrate the basic principles and characteristics of the present invention, but are not limited to the above embodiments. It should be understood that for ordinary technicians in this field, various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and these changes and modifications fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium-ion battery housing plate that can be rapidly cooled, characterized in that: The invention comprises an aluminum alloy micro-column array plate (1) and an Al2O3 fiber membrane (2), wherein the aluminum alloy micro-column array plate (1) comprises a base plate (16) and a plurality of micro-columns (17) arranged in a rectangular array on the base plate (16), a U-shaped channel (3) is provided on the top of the base plate (16) between two adjacent micro-columns (17), and the Al2O3 fiber membrane (2) is arranged on the base plate (16), and the Al2O3 fiber membrane (2) covers the U-shaped channel (3); The method for preparing a lithium-ion battery housing plate comprises the following steps: S1, using an electric spark wire cutting machine to cut the aluminum alloy workpiece according to the required micro-column (17) parameters by programming and controlling the electrode wire to produce an aluminum alloy micro-column array plate (1); S2, using aluminum source, catalyst, pore-forming agent and spinning aid as materials, preparing nanofiber membrane by electrospinning method, forming porous nanofiber membrane by calcining, and forming Al2O3 fiber membrane (2) with desired thickness and pore size by stacking and pressing multiple layers of porous nanofiber membranes; S3. Using a mold (5), the prepared Al2O3 fiber membrane (2) is embedded into the aluminum alloy micro-pillar array plate (1) at a desired depth, where the desired depth is the height of the micro-pillars (17), and then sintered at a high temperature to solidify the Al2O3 fiber membrane (2) to obtain a battery housing plate.

2. A lithium-ion battery housing plate capable of being rapidly cooled according to claim 1, characterized in that: The cross section of the microcolumn (17) is square, the width of the microcolumn (17) is 300µm-500µm, the height of the microcolumn (17) and the distance between two adjacent microcolumns (17) are equal to the width of the microcolumn (17), and the longitudinal cross section of the U-shaped channel (3) is semicircular, and the diameter of the semicircle is 300µm-500µm; The thickness of the Al2O3 fiber membrane (2) is 90-110 µm, and the average pore size of the Al2O3 fiber membrane (2) is 3-5 µm; The bottom plate (16) has a thickness of 1-1.2 mm.

3. The lithium-ion battery housing plate capable of being rapidly cooled according to claim 1, characterized in that: The parameters of the micro-columns (17) described in step S1 include the number of micro-columns in the array, the width of the micro-columns (17), the height of the micro-columns (17), the depth of the U-shaped channel (3), and the spacing between two adjacent micro-columns (17). The diameter of the electrode wire is the same as the diameter of the U-shaped channel (3). Before cutting, the current, voltage and processing compensation required for processing are adjusted. After adjustment, the electrode wire starts to cut the aluminum alloy workpiece.

4. The lithium-ion battery housing plate capable of being rapidly cooled according to claim 1, characterized in that: The mold (5) described in step S3 is a plate-like structure having an array of square holes, the number and distribution positions of the square holes (4) in the array of square holes correspond one-to-one to the plurality of micropillars (17) in the aluminum alloy micropillar array plate (1), the cross-section of the square holes (4) in the array of square holes is square, the aperture of the square hole (4) is larger than the width of the micropillar (17), and correspondingly, the spacing between two adjacent square holes (4) is smaller than the spacing between two adjacent micropillars (17), and the thickness of the mold (5) is equal to the height of the micropillar (17); The specific steps of embedding the Al2O3 fiber membrane (2) into the aluminum alloy micro-pillar array plate (1) are as follows: laying the prepared Al2O3 fiber membrane (2) flat on the top of the array micro-pillars in the aluminum alloy micro-pillar array plate (1), aligning the array square holes of the mold (5) with the array micro-pillars, and then pressing down the mold (5) to allow the micro-pillars (17) to enter the square holes (4).

5. A lithium-ion battery housing plate capable of being rapidly cooled according to claim 4, characterized in that: The mold (5) is made of antistatic plastic material. The mold (5) is prepared by a precision CNC milling machine, and the drill bit of the milling machine is a drill bit in the shape of a Lello triangle.

6. A lithium-ion battery housing plate capable of being rapidly cooled according to claim 4, characterized in that: The aperture of the square hole (4) is 10-30 µm larger than the width of the microcolumn. Correspondingly, the distance between two adjacent square holes (4) is 20-60 µm smaller than the distance between two adjacent microcolumns (17).

Images