Manufacturing device for square battery can pipe body of electric automobile

Abstract

The present invention relates to an apparatus for manufacturing a tube body for a square battery can of an electric vehicle, which can manufacture a precise tube body for a square aluminum battery can only by aluminum extrusion, and more particularly, to an apparatus for manufacturing a square tube body for a battery can of an electric vehicle, which adopts an aluminum alloy 6063 that is more advantageous for manufacturing a battery can, and which has a higher strength than an aluminum alloy 3003. According to the present invention, the strength after heat treatment is significantly increased, and therefore, cutting can be performed even without performing a cold working step, and according to the thickness of the extruded battery can tube, the length of the bearing is adjusted for each part to improve flatness, reduce thickness tolerance, improve surface defects, and provide a planarization mechanism, thereby making it possible to manufacture an extruded tube having a uniformly planarized surface.

Description

Technical Field

[0001] The present invention relates to a tube body manufacturing device for square battery cans, and in particular to a tube body manufacturing device for square battery cans of electric vehicles, which can manufacture precise tube bodies for square aluminum battery cans only by aluminum extrusion.

[0002] In particular, the present invention relates to a device for manufacturing a square battery can tube body for an electric vehicle, which adopts aluminum alloy 6063 which is more advantageous for manufacturing battery cans. Compared with aluminum alloy 3003, the strength of aluminum alloy 6063 is significantly increased after heat treatment, so cutting can be performed even without cold working process.

[0003] In addition, the present invention relates to a device for manufacturing a square battery can tube body for an electric vehicle, which adjusts the bearing length according to the thickness of the extruded battery can tube body and the various parts of the extrusion die, and sets a flattening mechanism at the outlet of the extruded tube body, thereby improving the flatness, reducing the thickness tolerance, and improving surface defects (surface aluminum pickup, molding lines, tearing, etc.). Background Art

[0004] Aluminum is light and easy to cast, can easily form alloys with other metals, is easy to process at room and high temperatures, and has excellent electrical and thermal conductivity. Therefore, aluminum is widely used throughout the industry.

[0005] On the one hand, in order to solve various problems including environmental pollution caused by excessive use of fossil fuels, electric vehicles (EVs), fuel cell vehicles (FCEVs) and hybrid vehicles (HEVs) that combine the characteristics of internal combustion engines and electric vehicles are being developed, and all of these vehicles inevitably require batteries.

[0006] As batteries, nickel batteries, lithium batteries, etc. are mainly used. These batteries have a structure that uses anode components, cathode components, electrolytes, separation membranes and other components to convert electrical energy into chemical energy for storage and then convert the chemical energy into electrical energy for use.

[0007] In such a battery used in a car, a battery can for storing the above-mentioned anode component, cathode component, electrolyte, separation membrane, etc. is an essential component. Such a battery can is made into various structures, including square, cylindrical, etc.

[0008] Various technologies for manufacturing such a battery case have been developed, as shown in Patent Documents 1 to 3.

[0009] The square battery can and its manufacturing method disclosed in patent document 1 are secondary battery cans and their manufacturing method manufactured by extrusion, which are characterized by comprising: a first step of extruding an aluminum extrusion rod with an extrusion die to form a hollow square can with a square cross-sectional shape; a second step of processing an aluminum plate to form a first cover plate and a second cover plate, and the first cover plate and the second cover plate cover the openings formed at both ends of the length direction of the above-mentioned square can; a third step of processing a connecting protrusion for inserting into the inner side of the above-mentioned opening on each of the above-mentioned cover plates, so that the connecting protrusion protrudes from one side of the above-mentioned cover plate and forms a step difference with the edge of the above-mentioned cover plate; and a fourth step of processing a safety exhaust valve hole on one of the above-mentioned cover plates or all of the above-mentioned cover plates or one of the side surfaces in the short axis direction of the square cross-section of the above-mentioned square can, and processing a step portion around the above-mentioned safety exhaust valve hole; and a fifth step of fixing the above-mentioned safety exhaust valve after installing the safety exhaust valve on the above-mentioned step portion to cover the above-mentioned safety exhaust valve hole.

[0010] Patent document 2 discloses a method for manufacturing an electric vehicle battery shell, comprising: a first step of preparing an aluminum plate having a thickness suitable for the battery shell, and processing the battery shell and the connecting parts on both sides that are expanded to a specified size through a blanking process so that the hanging piece on one side is combined with the hanging groove on the opposite side when the battery shell is formed; a step 1-1 of preparing an aluminum plate having a thickness suitable for an auxiliary plate of the battery shell, and preparing it by cutting off the auxiliary plate through a blanking process; a second step of forming two protrusions on the long side by a stamping die when the battery shell plate processed by the blanking process of the above-mentioned first step is formed into a battery shell through a forming process; a temporary bending step of forming two protrusions on the long side by a stamping die after the battery shell plate processed by the blanking process of the first step is formed into a battery shell through a forming process; The steps of: when the battery case is unfolded and formed into a battery case, temporarily bending the battery case plate material with two protrusions formed on the long side through shaping processing until the hanging piece is matched with the hanging groove formed on the connecting part of the short side; in the above-mentioned temporary bending state, applying pressure in the stamping die so that the hanging grooves and the hanging pieces formed on both sides of the connecting part are precisely combined with each other, and at the same time, the corners of the battery case form a right angle; and the auxiliary plate manufactured by step 1-1 is tightly attached to the inner surface of the short sides of the battery case manufactured by the above-mentioned steps, and the auxiliary plate is integrally attached to the inner surface of the short sides on both sides by spot welding or a strong adhesive to close the gap between the hanging groove and the hanging piece formed at the connecting part.

[0011] Patent document 3 discloses a method for manufacturing an electric vehicle battery shell, comprising: a first step of preparing an aluminum plate, and preparing a battery shell plate that is expanded to a specified size through a blanking process; a step 1-1 of preparing an aluminum plate having a thickness suitable for an auxiliary plate of the battery shell, and preparing it by cutting the auxiliary plate through a blanking process; a step of bending the battery shell plate prepared by the above steps through a shaping process to make the corners of the battery shell at right angles; a welding step of welding the connecting parts on both sides of the battery shell manufactured by the above steps; and a step of attaching the auxiliary plate manufactured by step 1-1 to the inner surface of the short side and bonding the auxiliary plate with spot welding or a strong adhesive.

[0012] As described above, a variety of technologies for manufacturing battery shells have been developed. Among such battery shells, the reason for manufacturing a square battery can in the shape of a square cylinder, in particular, using aluminum extruded material is that if a difference in thickness is given between the long side and the short side and the long side is thinner, more electrolyte can be put in, thereby increasing the battery capacity. Therefore, it is possible to manufacture a square battery can by making the thickness of the long side thinner. In addition, when aluminum is used, its heat dissipation is better than that of stainless steel, so it has the advantage of longer battery life.

[0013] However, if aluminum rolled material is used, the thickness difference cannot be given, so the thickness of the parts requiring strength cannot be increased. If necessary, additional stacking and adhering of plates may be performed. When high-strength rolled material is used, cracks may occur during bending, causing electrolyte leakage, and there is a risk of vehicle fire.

[0014] Aluminum extruded materials such as aluminum alloy 1050 or alloy 3003 are sometimes extruded and then drawn. However, there is no patent related to the manufacturing method of the extrusion die or the flattening mechanism for ensuring precise shape and size. In the case of subsequent processing such as drawing after extrusion, material loss is large, and the subsequent process is very troublesome and the cost is increased. In the case of drawing, additional drawing and washing processes are required after extrusion, which is not easy to cope with the supply quantity of electric vehicle batteries that need to be mass-produced. In the case of manufacturing based on extrusion operation, this inconvenience can be eliminated.

[0015] In addition, in the existing square battery can manufacturing technology, aluminum battery square cans use aluminum alloy 3003 as the raw material. Since it is a non-heat-treatable alloy, when it is manufactured based on extrusion operations, if its thickness does not change through subsequent cold working processes (rolling, drawing, rotary forging, etc.), the physical properties (strength and hardness) cannot be improved. Therefore, cutting processing cannot be performed only through extrusion, and there is a disadvantage of poor pressure resistance when used as a battery can, and there is a problem that the strength becomes even lower during heat treatment. .

[0016] In addition, the square aluminum battery can has thicknesses of 0.6mm, 0.8mm, and 1.1mm in the product size of 105.76*24.64mm. When manufacturing the tube body of this battery can, it is impossible to ensure that the thickness tolerance is within 0.07mm by using the existing bending manufacturing method of rolled plates. The extrusion + rolling process is very difficult, and there is a problem that the size and tolerance can hardly be met by extrusion alone.

[0017] In particular, it is known that an extrusion die is composed of a bridge die, a die, and a backing, and the amount of aluminum is distributed through the end holes of the bridge die. The general method is to adjust the pressure applied to the die and the flow by only adjusting the size and position of the end holes. However, in the case of the final product of the invention, i.e., a square battery can, the thickness of each side is very thin and varies according to the position. For a product shape with a thickness tolerance within a very small range, it is difficult to control the flow of aluminum. Therefore, it cannot be manufactured using the end holes and die shapes of a general mold.

[0018] Therefore, there is a need for an extrusion die manufacturing technology that can adjust the end hole shape, bearing length (Bearing Length), and gauge length (Gauge Length) to meet the product size.

[0019] Furthermore, in order to prevent further deformation of the extruded material passing through the die during extrusion, in most cases, the existing extrusion device is provided with an auxiliary table having only a bottom plate at the outlet, and has a device with an adjustable height to adjust the flatness of the product, and a device having a plurality of grooves for inserting carbon blocks at its rear end. In most cases, carbon blocks are placed on top of the auxiliary table for extrusion, but during extrusion, the carbon blocks are shaken and the flatness and straightness of the extruded material are often deteriorated. At this time, although the operator readjusts the position of the carbon blocks to prevent product deformation and ensure smooth extrusion, since the carbon blocks have very good heat conduction, most of them rise to a temperature similar to the outlet temperature of the extruded material during extrusion. When adjusting the carbon blocks that have moved out of position during the extrusion process, there is a problem of burns.

[0020] [Prior technical literature]

[0021] [Patent Literature]

[0022] (Patent Document 0001) Korean Patent Publication No. 10-2022-0017646

[0023] (Patent Document 0002) Korean Patent Publication No. 10-2022-0056345

[0024] (Patent Document 0003) Korean Patent Publication No. 10-2022-0101792 Summary of the invention

[0025] Technical issues to be solved

[0026] The present invention is developed to solve the above-mentioned problems of the prior art, and its purpose is to provide a device for manufacturing a tube body of a square battery can of an electric vehicle, which can manufacture a precise tube body for a square aluminum battery can only by aluminum extrusion.

[0027] In particular, the purpose of the present invention is to provide an electric vehicle square battery can tube manufacturing device using aluminum alloy 6063. Compared with aluminum alloy 3003, the strength of aluminum alloy 6063 is significantly increased after heat treatment. Therefore, even without cold working process, cutting processing can be performed, which is more beneficial to the manufacture of battery cans.

[0028] In particular, the purpose of the present invention is to provide a manufacturing device for a square battery can tube body of an electric vehicle, which adjusts the bearing length at each part according to the thickness of the extruded battery can tube body to improve the flatness and reduce the thickness tolerance, thereby improving surface defects such as surface pickup, mold lines, and tearing.

[0029] Problem Solution

[0030] In order to solve the problems mentioned above, the electric vehicle square battery can tube body manufacturing device based on the present invention is a device for manufacturing square can bodies for battery cans used in electric vehicle batteries, characterized in that it includes: an extrusion die, which is a combination of a bridge die and a pressing die, the bridge die has an end hole for adjusting the flow rate so as to extrude the extruded billet into a square tube body, the pressing die adjusts the bearing length and the bearing length is adjusted to be inclined so that less deformation occurs during extrusion and the dimensional accuracy near the curvature is improved; and a flattening mechanism, which is arranged at the outlet of the above-mentioned extrusion die, pressurizes the upper and lower surfaces of the extruded tube body extruded and output by the extrusion die to maintain flatness and prevent dimensional deformation, the above-mentioned flattening mechanism includes: a bottom block, which supports the bottom surface of the extruded tube body output from the extrusion die and flattens it; and an upper block, which presses the upper surface of the extruded tube body output from the extrusion die and flattens it; and a weight block, which is placed on the upper part of the above-mentioned upper block.

[0031] Preferably, the flattening mechanism comprises: a horizontal bracket having a block fixing groove formed on the upper surface, on which the bottom block is detachably fixed; two vertical brackets respectively assembled to the two ends of the horizontal bracket, on which facing surfaces of the two vertical brackets are formed block guide grooves, in which the ends of the upper block can be lifted and lowered; and a plurality of lifting guide rods penetrating the guide grooves and fixed to the two ends of the upper block, wherein the guide grooves penetrate the vertical brackets and are formed long up and down.

[0032] Preferably, the extruded tube has a square cross-section, and the long width portion is relatively thinner than the short width portion.

[0033] Preferably, the end hole of the above-mentioned bridge mold has a "concave" shape.

[0034] Preferably, the length of the bearing surface of the extrusion die has a tapered portion symmetrically centered on the center of the long width portion of the extruded tube body. Since the aluminum flows faster in the straight portion, the bearing length of the straight portion is longer. Since the aluminum flows slower in the curved portion, the bearing length of the curved portion may vary depending on the thickness of the product, but it is preferred that the bearing length of the curved portion be made to be 50 to 98% of that of the straight portion.

[0035] Since the thickness of the short width portion of the extruded material is different from each other, it is preferable that the bearing length of the extrusion die is manufactured to differ by 50 to 98% for each portion.

[0036] The extruded tube body is preferably manufactured so that the gauge length of the long width portion is thinner than the actual product thickness and the gauge length of the short width portion is the same as the actual product thickness in consideration of the amount of deformation of the extrusion die during extrusion.

[0037] Effects of the Invention

[0038] The electric vehicle square battery can tube manufacturing device based on the present invention adjusts the aluminum flow and material volume by changing the shape of the end holes of the bridge die constituting the extrusion die, which has the effect of ensuring uniform pressure and speed.

[0039] Furthermore, by adjusting the bearing length and gauge distance of the die of the present invention, the bending amount of the extrusion die can be adjusted, which has the effect of ensuring uniform thickness.

[0040] The flattening mechanism arranged at the outlet of the extruder after passing through the die applies pressure to the upper and lower surfaces of the extruded tube body through a plurality of block components constituting the flattening mechanism, thereby preventing bulging or concavity of the extruded tube body.

[0041] That is, the present invention sets a weight block so that the contact area between the bottom block and the top block is uniform during extrusion, thereby applying appropriate pressure to the extruded tube body, thereby preventing bulging and concavity.

[0042] Furthermore, in the present invention, a horizontal support and a vertical support constituting the flattening mechanism are provided, and the upper block and the lower module are assembled by these structures, thereby enabling the flattening mechanism to be easily and detachably provided.

[0043] In addition, the bracket can prevent the upper block and the lower module from shaking, thereby preventing the blocks from shaking when the extruded tube passes through, which has the effect of preventing the quality of the extruded tube from being reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1It is a partial cross-sectional view of the extrusion die constituting the electric vehicle square battery can tube manufacturing device based on the present invention.

[0045] Figure 2 It is a front view of the bearing portion of the extrusion die constituting the electric vehicle square battery can tube manufacturing device based on the present invention.

[0046] Figure 3 It is a three-dimensional view of the flattening mechanism that constitutes the electric vehicle square battery can tube manufacturing device based on the present invention.

[0047] Figure 4 It is an assembly sequence diagram of the flattening mechanism that constitutes the electric vehicle square battery can tube manufacturing device based on the present invention.

[0048] Among them, the figure numbers are as follows: 10. Extrusion die; 11. Bearing surface; 11f. Flat portion; 11t. Conical portion; 20. Flattening mechanism; 21. Bottom block; 22. Upper block; 22v. Vertical bracket; 23. Weight block; 24. Export auxiliary table; 25. Horizontal bracket; 25b. Block fixing groove; 26. Vertical bracket; 26b. Block guide groove; 26h. Guide groove; 27. Lifting guide rod; 28. Guide column; 100. Tube body. DETAILED DESCRIPTION

[0049] The present invention can be implemented with various modifications, and specific embodiments are shown in the drawings and described in detail. However, this does not mean that the present invention is intended to be limited to a specific embodiment, and it should be understood that all modifications, equivalents and substitutes belonging to the concept and technical scope of the present invention are included.

[0050] When describing the various drawings, similar reference numerals are used for similar components. When describing the present invention, if it is determined that the detailed description of the related known technology may make the gist of the present invention unclear, the detailed description will be omitted.

[0051] In the present invention, the bearing length is adjusted at each position according to the thickness of the battery can tube to improve the flatness and reduce the thickness tolerance, thereby improving the surface defects such as surface pickup, mold lines, and drawing.

[0052] The electric vehicle square battery can tube manufacturing device based on the present invention is a device for manufacturing a square tube body for a battery can for an electric vehicle battery, which comprises: an extrusion die 10, for extruding an extruded blank into a square tube body; and a flattening mechanism 20, which is arranged at the outlet of the above-mentioned extrusion die, and pressurizes the upper and lower surfaces of the extruded tube body extruded and output by the extrusion die to maintain flatness and prevent dimensional deformation.

[0053] The above-mentioned extrusion die 10 is composed of a bridge die and a die pressing combination. The bridge die has an end hole of a specific shape for adjusting the flow rate so as to extrude the extruded billet into a square tube body. In order to reduce deformation during extrusion and especially improve the dimensional accuracy near the curvature, the die adjusts the bearing length, and the bearing length is adjusted to be inclined.

[0054] As described above, the bridge die is provided with an end hole, and the end hole is formed in a "concave" shape, thereby making it easy to adjust the flow amount of the extruded material, thereby improving the quality of the extruded product.

[0055] Considering the amount of deformation of the extrusion die during extrusion, it is preferred that the gauge length of the long width portion of the extruded tube be manufactured to be thinner than the actual product thickness, and the gauge length of the short width portion be manufactured to be the same as the actual product thickness.

[0056] The extruded tube body manufactured by the electric vehicle square battery can tube body manufacturing device based on the present invention is a tube body with a square cross-section, the long width portion L is relatively thinner than the short width portion S, the thickness on one side of the short width portion is 0.8 mm, the thickness on the other side is 1.1 mm, and the thickness of the long width portion is 0.55 or 0.525 mm.

[0057] When extruding this kind of extruded tube, when the blank is pressurized by the mandrel, the extrusion die is also under pressure. Even if the die is thick, the gauge part (opening) of the pressure die may be deformed outward when passing through a narrow interval. Therefore, it is necessary to control the size of the gauge part (the spacing of the openings).

[0058] Although the outer contour size of the extrusion die is not a big problem, the thickness varies according to the position of the core, so it is important to optimally set the core thickness and position. In the present invention, the gauge length size of the thicker part of the short width portion on both sides of the extruded tube body, that is, the long width portion of the portion not 0.8mm and 1.1mm, that is, the 0.6mm (existing) thickness corresponding portion is controlled. This is because it is also very thin in the thickness size that can be achieved during extrusion, and deformation may cause changes in its shape and product size. Therefore, this part is a very important part. For this reason, the gauge length size of the wide width portion is set to 0.525mm to ensure dimensional uniformity.

[0059] Furthermore, in order to ensure precise dimensions, the bearing length and shape of the above extrusion die need to be adjustable.

[0060] That is, in the above-mentioned extrusion die, the bearing length refers to the part of the die and aluminum friction that forms a certain length along the thickness direction of the die in the bridge die and the die of the extrusion die. When the bearing length is not optimized, the pressure becomes higher or lower during extrusion, so that the molding of the product cannot be carried out smoothly, and the temperature may become higher or lower during extrusion. Therefore, it is one of the very important basic elements in the extrusion die that may affect the surface quality and physical properties of the product. The gauge size is the distance between the bearings of the bridge die and the die. When the gauge size is not optimized, the extruded material tends to one side or cannot be extruded during extrusion. Therefore, it is one of the very important basic elements in the extrusion die.

[0061] Therefore, it is preferred that the bearing surface of the extrusion die has a tapered portion symmetrically centered on the center of the long width portion of the extruded tube. Since the aluminum in the straight portion flows quickly, the bearing length of the straight portion is set to be longer. Since the aluminum in the curved portion flows slowly, although the length of the curved portion may vary depending on the product thickness, it is preferred that the bearing length of the curved portion be set to 50 to 98% of that of the straight portion.

[0062] Since the thickness of the short width portion of the extruded material is different from one another, it is preferred that the length of the extrusion die bearing is manufactured to differ by 50 to 98% for each location.

[0063] In addition, if the gauge length is adjusted to ensure a certain thickness, the product shape and thickness of each part are adjusted within the range of 50-99% with respect to the bearing length to ensure the final size and surface condition of the product. At this time, if the bearing surface length is set to be longer, although the product size is uniform, there are the following problems: the friction surface becomes longer during extrusion and the surface temperature of the extruded material increases, resulting in surface coarsening or surface aluminum pickup; the extrusion pressure increases during extrusion, thereby increasing the burden on the extruder, which can shorten the life of the extruder and its parts, and the temperature of the hydraulic oil increases and the extruder shuts down.

[0064] On the contrary, if the length of the bearing surface is shortened, it will be easier to extrude, but if the melting temperature is not ensured during extrusion, the physical properties may deteriorate. In particular, the speed of aluminum is increased during extrusion, so not only will the speed difference cause the product surface to bend, but there is also a problem that the cross-sectional dimensions of the product will change significantly according to the length of the extruded material before and after.

[0065] Therefore, in the present invention, a tapered portion 11t is provided in different intervals where the thickness of the compressed tube body is 0.6 mm, 0.8 mm and 1.1 mm respectively to adjust the flow of aluminum, thereby preventing the phenomenon of leaning to one side or a step difference when the thickness changes.

[0066] That is, Figure 2As shown, the tapered portion 11t is formed so that the bearing surface 11 of the extrusion die 10 is symmetrically formed with the center of the long width portion L of the extruded tube body as the center.

[0067] In the case of the extruded tube of the above example, a tapered portion 11t is formed from a position 30 mm from the center of the long width portion L of the extruded tube to the short width portions on both sides where the bearing length changes.

[0068] In addition, the bearing length of the four corners also has an important influence on the formation of the corners. The speed and shape of the corners are determined by where to where and how long the bearing is formed. Therefore, the bearing length of the corner is adjusted so that extrusion can be performed at the same speed in the overall product shape.

[0069] That is, in order to optimize the bearing length according to the position, the bearing length is adjusted by 0.1 to 0.2 mm. For the long side, the bearing length from the center to the 42mm point is 2.8 mm, and the bearing length from the center to the 30mm point is changed to 2.7 mm. Then, a cone is made for the starting part of the bending, that is, the 19.5mm point. The bearing length is set to 2.1 mm for the part from the beginning of the thickness change to 3.54 mm. A cone is made again for the part from the end of the bending to the 2.74mm point. The bearing lengths of 3.3 mm and 4.5 mm are made from the middle of the short side to the 2.745mm point respectively to ensure the final product size.

[0070] The tapered portion 11t of the bearing formed as above serves as a requirement for adjusting the flow rate at a location with a sharp thickness change, and can prevent the following problems that may occur in a mold that is not provided with a tapered portion: damage to the mold due to higher loads at corners or bends during extrusion; damage to the core of the male mold due to the inability of the flow to find a normal position; color difference caused by thickness changes, etc.

[0071] As described above, the electric vehicle square battery can tube manufacturing device of the present invention having the extrusion die as described above is also provided with the above-mentioned flattening mechanism at the die outlet to flatten the long width portion L of the extruded tube.

[0072] like Figure 3 As shown, the flattening mechanism 20 includes: a bottom block 21, which supports the bottom surface of the extruded tube output from the extrusion die for flattening; an upper block 22, which presses the upper surface of the extruded tube output from the extrusion die for flattening; and a weight block 23, which is placed on the upper part of the upper block.

[0073] The extruded tube body is flattened while passing between the bottom block and the top block, thereby preventing not only bulging but also concavity.

[0074] The above-mentioned flattening mechanism 20 can minimize the bulging and concave phenomena only if the above-mentioned bottom block and the upper block can be used efficiently. In order to efficiently use the upper block and the bottom block, the above-mentioned flattening mechanism 20 includes: a horizontal bracket 25, on the upper surface of which a block fixing groove 25b is formed, and the above-mentioned bottom block is detachably fixed on the block fixing groove 25b; two vertical brackets 26, which are respectively assembled to the two ends of the above-mentioned horizontal bracket, and block guide grooves 26b are formed on the surfaces facing each other, and the ends of the above-mentioned upper block can be inserted into the block guide grooves 26b in a lifting manner; and a plurality of lifting guide rods 27, which pass through the guide grooves 26h and are fixed to the two ends of the upper block, and the guide grooves 26h pass through the above-mentioned vertical brackets and are formed long from top to bottom.

[0075] The flattening mechanism 20 constructed as above, after fixing the horizontal bracket 25 on the exit auxiliary platform 24, inserting and fixing the vertical bracket 26 into the grooves formed on both sides of the horizontal bracket 25, and then tightening the bolts on the horizontal bracket to combine the vertical bracket and the horizontal bracket.

[0076] After the bottom block 21 is arranged to fit into the block fixing groove 25 b formed on the upper portion of the horizontal bracket 25 , a plurality of guide posts 28 are inserted and fixed to both sides of the bottom block.

[0077] Afterwards, after the head of the extruded tube body passes through the bottom block 21, the upper block 22 is inserted into the block guide groove 26b aligned with the vertical bracket, and a weight block 23 is placed on the upper part of the upper block so that the upper block is stationary and the whole block bears the load evenly, thus completing the configuration of the flattening mechanism.

[0078] Afterwards, the height of the outlet auxiliary table 24 is adjusted up and down to prevent bulging and concavity from occurring. Thus, the contact areas of the blocks during extrusion are uniform, and appropriate pressure is provided by the weight block to prevent bulging and concavity.

[0079] The flattening mechanism 20 constructed as above can be simply set up in a detachable manner on the outlet auxiliary table, so the setting is very simple, and the blocks will not shake, thereby preventing the shaking phenomenon when the extruded tube passes through. Even if extrusion is performed to multiple end holes, they will not interfere with each other, and because it has the effect of supporting the product, it will not affect the quality of the extruded tube.

Claims

1. A device for manufacturing a square battery can tube body for electric vehicles, which is a device for manufacturing a square tube body for a battery can, wherein the battery can is used for batteries of electric vehicles, and is characterized in that: include: The extrusion die (10) is a combination of a bridge die and a die, wherein the bridge die has an end hole for adjusting the flow rate so as to extrude the extruded blank into a square tube, and the die adjusts the bearing length and the bearing length is adjusted to be inclined so as to reduce deformation during extrusion and improve the dimensional accuracy near the curvature; and a flattening mechanism (20) is provided at the outlet of the extrusion die, and pressurizes the upper and lower surfaces of the extruded tube output by the extrusion die to maintain flatness and prevent dimensional deformation. The flattening mechanism (20) comprises: a bottom block (21) for supporting the bottom surface of the extruded tube output from the extrusion die for flattening; an upper block (22) for pressing the upper surface of the extruded tube output from the extrusion die for flattening; and a weight block (23) placed on the upper part of the upper block.

2. The electric vehicle square battery can tube manufacturing device as claimed in claim 1, It is characterized in that The above-mentioned flattening mechanism (20) comprises: A horizontal bracket (25) is formed with a block fixing groove (25b) on the upper surface, and the bottom block is detachably fixed on the block fixing groove (25b); Two vertical brackets (26) are respectively assembled to the two ends of the horizontal bracket, and block guide grooves (26b) are formed on the facing surfaces of the two vertical brackets (26), and the ends of the upper block can be inserted into the block guide grooves (26b) in a liftable manner; and A plurality of lifting guide rods (27) penetrate the guide groove (26h) and are fixed to both ends of the upper block. The guide groove (26h) penetrates the vertical bracket and is formed long vertically.

3. The electric vehicle square battery can tube manufacturing device according to claim 1, It is characterized in that The extruded tube is a tube having a square cross section, wherein the long width portion (L) is relatively thinner than the short width portion (S). The bearing surface (11) of the extrusion die (10) has a tapered portion (11t) which is symmetrical with the center of the long width portion (L) of the extruded tube body as the center.

4. The electric vehicle square battery can tube manufacturing device according to claim 1, It is characterized in that The extruded tube is a tube having a square cross section, wherein the long width portion (L) is relatively thinner than the short width portion (S). The gauge length of the long width portion of the extrusion die (10) is relatively thinner than that of the actual finished product, and the gauge length of the short width portion is the same as the thickness of the actual finished product.

5. The electric vehicle square battery can tube manufacturing device as claimed in claim 4, It is characterized in that The lengths of the bearing surfaces corresponding to the corners of the extruded tube of the extrusion die are adjusted by 0.1 mm to 0.2 mm.

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