Manufacturing method of integrated liquid-cooled steel battery case and battery case thereof

Abstract

The application discloses a manufacturing method of a steel battery box integrated with liquid cooling, and the manufacturing method comprises the following steps: S1, cutting a square steel through a punching die to obtain a designed outer dimension and length, and cutting a plurality of punching notches along the length direction of the square steel; S2, bending the square steel along the punching notches to form a closed frame; S3, processing a sealing surface mounting hole on the closed frame through a hot melting drilling device; S4, opening a mold according to a liquid cooling design structure to suck plastic a liquid cooling bottom plate and a flow channel PP plate on the liquid cooling bottom plate; S5, punching an aluminum plate according to a size requirement; S6, hot-pressing the flow channel PP plate and the aluminum plate to form a shape, and welding a water nozzle at a hole position of the aluminum plate; S7, gluing the liquid cooling bottom plate and the closed frame together; and S8, gluing a honeycomb composite plate and the liquid cooling bottom plate together, and connecting the honeycomb composite plate and the liquid cooling bottom plate to the closed frame through bolts. The application provides a manufacturing method of a steel battery box integrated with liquid cooling, and the battery box has the characteristics of low cost and light weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of integrated liquid-cooled steel battery box. BACKGROUND

[0002] Traditional sheet metal steel box is gradually replaced by aluminum profile box because of its heavy weight, high cost of developing stamping die, poor air tightness and other problems; but with the reduction of energy density subsidy and the emergence of new technologies and new structures such as integration, steel box is once again concerned by the industry; and reasonable setting of the battery box can effectively reduce the material cost and process cost, and achieve the purpose of low cost and light weight. SUMMARY

[0003] The present application provides a manufacturing method of an integrated liquid-cooled steel battery box and a battery box with low cost and light weight.

[0004] Technical scheme: In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0005] A manufacturing method of an integrated liquid-cooled steel battery box, the manufacturing method comprises the following steps:

[0006] S1: cutting a square steel through a punching die to obtain a designed outer dimension and length, and punching a plurality of cutting holes along the length direction of the square steel;

[0007] S2: bending along the cutting holes of the square steel, combining to form a closed frame, and fixing with rivets, and connecting the four corners and the front and back surfaces of the closed frame through arc welding;

[0008] S3: processing a sealing surface mounting hole on the closed frame by using a hot melt drilling equipment;

[0009] S4: opening a mold to suck plastic a liquid cooling bottom plate and a flow channel PP plate on the liquid cooling bottom plate according to a liquid cooling design structure;

[0010] S5: punching an aluminum plate according to the size requirement, and processing a microstructure through laser;

[0011] S6: hot pressing the flow channel PP plate and the aluminum plate, and welding a water nozzle at the hole position of the aluminum plate;

[0012] S7: gluing the liquid cooling bottom plate and the closed frame together;

[0013] S8: gluing the honeycomb composite plate and the liquid cooling bottom plate together, and connecting them on the closed frame through bolts.

[0014] Further, the closed frame is combined to form a zigzag shape at the joint, and the flange at the joint is fixed by using rivets.

[0015] Further, the cold liquid bottom plate is located in the closed frame, and the edge of the cold liquid bottom plate is attached to the surface of the closed frame; the honeycomb composite board is connected to the bottom surface of the closed frame; the cold liquid bottom plate and the honeycomb composite board sandwich the closed frame, and the closed frame is sleeved around the cold liquid bottom plate.

[0016] Further, the frame body is made of hollow square steel by bending and splicing; the fitting notch is punched on the bending part of the frame body; the inner side edge is arranged on one side edge of the fitting notch; the tab and the inner recess are arranged on the inner wall of the fitting notch; when the fitting notch is bent and spliced, the tab is correspondingly spliced in the inner recess; the inner side edge is bent and attached to the side wall of the square steel; the mounting hole is arranged on the surface and the bottom surface of the frame body.

[0017] Further, the cold liquid bottom plate is a groove-shaped box; the groove-shaped box is embedded in the frame body; the integral fixing ring is fixed on the edge of the groove-shaped box; a plurality of corresponding holes are arranged on the fixing ring; and the corresponding holes are coaxially arranged with the mounting holes.

[0018] Further, the groove-shaped box is formed by suction forming a flow channel bottom plate on the bottom surface; a plurality of convex edges are formed on the flow channel bottom plate; a plurality of liquid flow channels are formed between the convex edges; the plurality of liquid flow channels are arranged in communication with each other; one end of the convex edge in the middle of the flow channel bottom plate is connected with the inner wall of the groove-shaped box to separate a plurality of liquid flow channels on both sides; a flow passage is arranged between the other end of the convex edge in the middle of the flow channel bottom plate and the inner wall of the groove-shaped box; a plurality of the convex edges are covered with the closed base plate, and the closed base plate is arranged in a closed manner; the liquid inlet and the liquid outlet are arranged on one side of the closed base plate; and the liquid inlet and the liquid outlet are distributed on both sides of the convex edge in the middle.

[0019] Further, the frame body is glued with the honeycomb composite board; the honeycomb composite board is supported on the cold liquid bottom plate; a plurality of embedding holes are arranged around the edge of the honeycomb composite board; and the embedding holes are arranged corresponding to the mounting holes.

[0020] Further, the liquid inlet is provided with an adjusting structure; the adjusting structure comprises a magnetic attraction structure and a matching ring block; the matching ring block is arranged in the liquid inlet; a plurality of adjusting elastic sheets are arranged on the inner wall of the matching ring block; the magnetic attraction structure is sleeved on the liquid inlet; the magnetic ring of the magnetic attraction structure drives the matching ring block to reciprocate along the liquid inlet direction, and the plurality of adjusting elastic sheets correspondingly swing to adjust the liquid quantity.

[0021] Beneficial effects: the battery box in the application has the excellent characteristics of lightweight and low cost; the beneficial effects include but are not limited to the following:

[0022] 1) Compared with the traditional liquid cooling structure of upper and lower aluminum plates, this type of liquid cooling base plate saves the high cost of molds and the investment in brazing equipment, resulting in lower development costs and lighter weight. The heat-conducting surface in contact with the battery cell is made of aluminum plate, which utilizes the high thermal conductivity of aluminum plate to ensure efficient heat conduction between the battery cell and the plate. Other parts use PP material with high thermal conductivity to reduce cooling efficiency loss. At the same time, the overall molding of PP material can better ensure the airtightness of the enclosure.

[0023] 2) Adjusting the elastic plate causes the liquid to accelerate and impact the liquid distribution convex edge. The pressurized liquid can promote the flow of liquid in several liquid channels and avoid stagnation in the liquid channels. After the mating ring block and the adjusting elastic plate are released, the elastic element causes the mating ring block to reset. The magnetic ring will drive the mating ring block to move again next time. Through this intermittent pressurization, the flow of liquid can be promoted and the cooling effect of liquid on the internal components of the battery box can be increased. Attached Figure Description

[0024] Appendix Figure 1 For the manufacturing process flowchart;

[0025] Appendix Figure 2 This is a structural diagram of the battery casing;

[0026] Appendix Figure 3 To match the gap structure diagram;

[0027] Appendix Figure 4 This is a structural diagram of a trough-shaped box.

[0028] Appendix Figure 5 This is a structural diagram of a honeycomb composite panel;

[0029] Appendix Figure 6 To adjust the structure diagram;

[0030] Appendix Figure 7 To match the ring block structure diagram. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] As attached Figures 1-7 A method for manufacturing an integrated liquid-cooled steel battery casing, the method comprising:

[0033] S1: The square steel is punched out to the designed external dimensions and length using a punching die, and multiple punching cuts are made along the length of the square steel.

[0034] S2: Bend along the punched cut of the square steel to form a closed frame around it, and fix it with rivets. The four corners of the closed frame and the front and back sides are connected by arc welding.

[0035] S3: The sealing surface mounting hole is processed on the spliced and welded closed frame by using a hot melt drilling device;

[0036] S4: The liquid cooling bottom plate and the flow channel PP plate on the liquid cooling bottom plate are sucked out by opening mold according to the liquid cooling design structure;

[0037] S5: The aluminum plate is punched according to the size requirement, and the microstructure is processed by laser;

[0038] S6: The flow channel PP plate and the aluminum plate are hot-pressed, and the water nozzle is welded at the hole position of the aluminum plate;

[0039] S7: The liquid cooling bottom plate and the closed frame are glued together;

[0040] S8: The honeycomb composite plate 41 and the liquid cooling bottom plate are glued together and connected by bolts on the closed frame. The closed frame is combined with the honeycomb composite plate and the liquid cooling bottom plate, and is glued, and then is fixed together by bolts, so as to ensure the fastening after manufacturing, avoid loosening, achieve the cooling effect, and achieve the purposes of low cost and light weight.

[0041] The closed frame is combined to form a zigzag line, and the flange of the combined part is fixed by using a rivet, so as to reduce the welding process and save the processing cost.

[0042] The middle part of the liquid cooling bottom plate is in the closed frame, and the edge of the liquid cooling bottom plate is pressed on the surface of the closed frame. The honeycomb composite plate 41 is connected to the bottom surface of the closed frame. The liquid cooling bottom plate and the honeycomb composite plate 41 sandwich the closed frame, and the closed frame is sleeved around the liquid cooling bottom plate, and is glued together, and then is fixed together by bolts, so as to play a fastening role, ensure the integrity of the battery box body, and avoid loosening.

[0043] The closed frame is a ring-shaped rectangular frame body 1; the frame body 1 is made by bending and splicing hollow square steel; the frame body 1 is punched with a matching notch 11 at the bending position; the matching notch 11 is a curved line in cross section; an inner side edge 12 is arranged at one side edge of the matching notch 11; a tab 111 and an inner recess 112 are arranged on the inner wall of the matching notch 11, and the inner side edge 12 is arranged close to the inner recess 112; when the matching notch 11 is bent and spliced, the tab 111 is correspondingly spliced in the inner recess 112; the inner side edge 12 is bent and attached to the side wall of the square steel; the inner side edge 12 is fixed on the square steel by rivets; mounting holes 13 are arranged on the surface and the bottom surface of the frame body 1, and the inner edges of the mounting holes 13 are protruded into the frame body 1 to form threaded pipe holes 14. The protrusions and recesses of the tabs at the positions of the matching notches and the inner recesses are matched after bending, so that the outer side does not need to be welded, and the inner side edge is fixed by rivet pull riveting connection, which saves the welding process, can increase the horizontal direction extrusion strength, better ensure the size accuracy, and also reduce the process cost; the mounting holes on the frame body and the embedded holes on the honeycomb composite board are directly machined with screw threads on the edge by a hot melting drilling process, which saves the traditional process route of first drilling holes, then drilling hexagonal holes, and then pulling rivet nuts, greatly reducing the material cost and process cost.

[0044] The cold liquid bottom plate is a groove-shaped box 2; the groove-shaped box 2 is correspondingly embedded in the frame body 1, and the side wall of the groove-shaped box 2 and the inner wall of the frame body 1 are glued together; the groove-shaped box 2 is integrally provided with a fixed ring plate 21 at the edge, and the fixed ring plate 21 is attached to the surface of the frame body 1; a plurality of corresponding holes 22 are arranged through the fixed ring plate 21; a plurality of corresponding holes 22 are coaxially arranged with the mounting holes 13; the corners of the groove-shaped box 2 are chamfered at the positions of the inner side edges 12. The cold liquid bottom plate is embedded in the frame body, and the side wall and the inner wall of the frame body are glued together, and the top is fixed by the fixed ring plate after gluing, forming an integral box structure to ensure the integrity.

[0045] The groove-shaped box 2 bottom surface is formed by blow molding to form a flow channel bottom plate 3, which is made of PP material; a plurality of convex edges 31 are formed on the flow channel bottom plate 3; a plurality of liquid flow channels 32 are formed between the convex edges 31; a plurality of liquid flow channels 32 are arranged in communication with each other; a plurality of convex edges 31 are provided with an outer convex edge 311 protruding from the middle; one end of the convex edge 31 in the middle of the flow channel bottom plate 3 is connected with the inner wall of the groove-shaped box 2 and is separated from a plurality of liquid flow channels 32 on both sides; a flow passage 33 is arranged between the other end of the convex edge 31 in the middle of the flow channel bottom plate 3 and the inner wall of the groove-shaped box 2; a plurality of liquid flow channels 32 are connected through the flow passage 33; a plurality of convex edges 31 are covered with a closed base plate 34, and are closed; the closed base plate is made of aluminum plate and is processed into microstructure by laser; then it is connected with the flow channel bottom plate by hot pressing to form a complete cold liquid bottom plate structure; compared with the traditional upper and lower aluminum plate liquid cooling structure, this cold liquid bottom plate saves the high mold cost and the investment of brazing equipment, has low development cost and lighter weight, uses aluminum plate on the heat conduction surface in contact with the battery cell, uses the high thermal conductivity of the aluminum plate to ensure efficient heat conduction between the battery cell and the aluminum plate, uses the high thermal conductivity of the PP material at other positions to reduce the cooling efficiency loss, and the overall molding of the PP material can also better ensure the air tightness of the box. The closed base plate 34 is provided with a liquid inlet pipe 341 and a liquid outlet pipe 342 on one side; the liquid inlet pipe 341 and the liquid outlet pipe 342 are arranged on both sides of the convex edge 31 in the middle, and the liquid inlet pipe 341 and the liquid outlet pipe 342 are arranged away from the flow passage 33. Through the shunt of the convex edge, the liquid is dispersed and flows, improving the cooling effect.

[0046] A plurality of liquid flow channels 32 are provided with a liquid distribution convex edge 35 at one end; the liquid distribution convex edge 35 is perpendicular to a plurality of convex edges 31; the liquid inlet pipe 341 and the liquid outlet pipe 342 are arranged on the side away from the convex edge 31 corresponding to the liquid distribution convex edge 35; a plurality of liquid flow channels 32 are in communication with the outside through the liquid inlet pipe 341 and the liquid outlet pipe 342. The cooling liquid flows into the liquid inlet pipe and is sprayed onto the liquid distribution convex edge. After the liquid is shunted, it flows through a plurality of liquid flow channels, and then converges and flows out through the liquid outlet pipe. Through the flow of the cooling liquid, the components of the battery box can be cooled.

[0047] The frame body 1 is glued with a honeycomb composite plate 41 on the bottom surface; the honeycomb composite plate 41 is supported on the cold liquid bottom plate 3; a plurality of embedded holes 4 are arranged around the edge of the honeycomb composite plate 41; and a plurality of mounting holes 13 are arranged corresponding to the embedded holes 4. After the honeycomb composite plate and the cold liquid bottom plate are glued on the frame body, the edges of the honeycomb composite plate, the frame body and the cold liquid bottom plate are fixed together through bolts, so as to improve the fastening degree and avoid easy separation. The bottom guard plate is made of a honeycomb composite plate, which is equivalent to a traditional steel guard plate. The high mold development cost is saved, the weight is lightened, the rigidity is better, the energy absorption, sound insulation, heat insulation and fire resistance are good, the load-bearing electrical performance of the cold liquid bottom plate is improved, and the bottom anti-scratching effect is good.

[0048] The liquid inlet 341 is provided with an adjusting structure 5; the adjusting structure 5 includes a magnetic attraction structure 51 and a matching ring block 52; the matching ring block 52 is arranged in the liquid inlet 341; a plurality of adjusting elastic sheets 53 are arranged around the inner wall of the matching ring block 52; the adjusting elastic sheet is a composite structure, and a plurality of elastic sheet structure composite layers are arranged in layers; the lengths of the adjusting elastic sheets on one end are unevenly arranged, so as to cut the flowing liquid; the heights of the adjusting elastic sheets between adjacent adjusting elastic sheets are staggered; the distances between the adjusting elastic sheets are unevenly arranged, so as to change the liquid flow and flow direction during reciprocating movement of the adjusting elastic sheets, thereby playing a role of adjusting and increasing pressure; the magnetic attraction structure 51 is sleeved on the liquid inlet 341; the magnetic ring 511 of the magnetic attraction structure 51 drives the matching ring block 52 to reciprocate in the liquid inlet direction, and the plurality of adjusting elastic sheets 53 are correspondingly swung and adjusted in the liquid inlet amount; the magnetic ring and the matching ring block are magnetically attracted, the magnetic ring drives the matching ring block to move, the matching ring block drives the adjusting elastic sheet to move, the liquid passes through the plurality of adjusting elastic sheets, the liquid flow promotes the bending of the adjusting elastic sheet, in the process that the matching ring block drives the adjusting elastic sheet to move, the plurality of adjusting elastic sheets move downward to push the liquid, so as to increase the pressure; when the matching ring block and the magnetic ring are separated, the matching ring block and the adjusting elastic sheet are released, and the pressure is reduced; after the liquid inlet amount is instantaneously reduced, the normal liquid inlet is restored; in this way, the liquid inlet amount is adjusted, the pressure is intermittently increased, and the liquid flow is promoted; when the water flow passes through the adjusting elastic sheet, the adjusting elastic sheet is composed of a plurality of elastic sheet structures, in the reciprocating movement process of the adjusting elastic sheet, the forces acting on the plurality of elastic sheet structures are uneven, then the plurality of elastic sheet structures are correspondingly separated or attached, the adjusting elastic sheet is correspondingly vibrated and swung, the pressure is increased, and the liquid flow is promoted.

[0049] The liquid in the liquid inlet 341 is injected into the liquid flow channel 32 from top to bottom; the inner wall of the liquid inlet 341 is surrounded by a containing groove 343; the matching ring block 52 is in the containing groove 343, and the matching ring block 52 is arranged at the top end of the containing groove 343; the matching ring block 52 is coaxially arranged with the liquid inlet 341; the elastic member 54 is fixedly clamped between the bottom of the matching ring block 52 and the bottom of the containing groove 343. Since the liquid inlet is arranged opposite to the position of the liquid distribution convex rib, the liquid after being pressurized can be well dispersed on the liquid distribution convex rib, promoting the liquid to flow into several liquid flow channels. Since it is not a single channel, there will be some liquid flow channels with large flow and some liquid flow channels with small flow, and the position of the liquid flow channel with small flow has poor cooling effect. The sudden pressurization can promote the flow of liquid in the liquid flow channel and avoid the liquid from staying in the liquid flow channel, thereby affecting the refrigeration effect.

[0050] The cross section of the adjusting elastic sheet 53 is triangular, and the adjusting elastic sheet 53 is an elastic structure; the acute angle end of the adjusting elastic sheet 53 is arranged to approach the middle part of the matching ring block 52, and the adjusting elastic sheet 53 is arranged in a ring-shaped manner; the gap between the approaching ends of the adjusting elastic sheets 53 gradually increases; the bottom of the adjusting elastic sheet 53 and the inner wall of the matching ring block 52 are provided with a supporting block 55, and the supporting block 55 is an elastic structure; the liquid in the liquid inlet 341 drives the adjusting elastic sheet 53 to be extruded on the supporting block 55. The liquid pushes away the adjusting elastic sheets, and then flows into the liquid flow channel through the movable interval flow channel. When the adjusting elastic sheet moves up and down, the adjusting elastic sheet and the supporting block will have a rebound effect, so the flow of the liquid through the adjusting elastic sheet will change, thereby adjusting the liquid amount and achieving the effect of pressurization, promoting the flow of the liquid.

[0051] The magnetic attraction traction structure 51 comprises a magnetic ring 511 and a telescopic rod 512; a plurality of telescopic rods 512 are slidably arranged around the liquid inlet pipe 341; the driving device on the side wall of the cold liquid cavity is drivingly connected with one end of the telescopic rod 512; the magnetic ring 511 is fixed on the other end of the telescopic rod 512; the magnetic ring 511 is arranged corresponding to the position of the matching ring block 52; the magnetic ring 511 is slidably arranged on the liquid inlet pipe 341; the matching ring block 52 is a magnetic structure; the magnetic ring 511 and the matching ring block 52 are arranged to be attracted to each other; the active interval 344 is formed between the containing groove 343 and the liquid inlet pipe 341; the telescopic rod 512 drives the matching ring block 52 to move in the active interval 344 through the magnetic ring 511, and the matching ring block 52 is compressed by the elastic member 54; the magnetic ring 511 and the matching ring block 52 are separated, and the elastic member 54 drives the matching ring block 52 to reset; a plurality of adjusting elastic sheets 53 limit the liquid inlet amount. The magnetic ring drives a plurality of adjusting elastic sheets to move through the matching ring block, the adjusting elastic sheets move along the liquid flow direction, and then the adjusting elastic sheets can extrude the flowing liquid, thereby playing a role of pressure boosting, promoting the liquid to impact on the liquid distribution convex rib at high speed, thereby promoting the liquid to disperse in the liquid flow channel, and the liquid after pressure boosting can promote the liquid flow in a plurality of liquid flow channels, avoiding the liquid flow channel from being stagnant. After the matching ring block and the adjusting elastic sheet are released, the elastic member promotes the matching ring block to reset, and the matching ring block is driven to move by the magnetic ring again next time; through such intermittent pressure boosting, the liquid flow is promoted, and the cooling effect of the liquid on the internal components of the battery box is increased.

[0052] The above is only the preferred embodiment of the present application, and is not used to limit the present application. Those skilled in the art can make some improvements and changes without departing from the above principles of the present application, and these improvements and changes are also considered to be within the protection scope of the present application.

Claims

1. A method for manufacturing an integrated liquid-cooled steel battery case, characterized in that, Includes a battery box, the battery box includes a coolant bottom plate, the coolant bottom plate is a trough-shaped box (2); the trough-shaped box (2) is correspondingly embedded inside the frame body (1); The bottom surface of the trough-shaped box (2) is vacuum-formed to form a flow channel bottom plate (3); a plurality of protruding ridges (31) are formed on the flow channel bottom plate (3); liquid flow channels (32) are formed between the plurality of protruding ridges (31); the plurality of liquid flow channels (32) are interconnected; one end of the protruding ridge (31) in the middle of the flow channel bottom plate (3) is connected to the inner wall of the trough-shaped box (2) and separated from the plurality of liquid flow channels (32) on both sides; a flow port (33) is provided between the other end of the protruding ridge (31) in the middle of the flow channel bottom plate (3) and the inner wall of the trough-shaped box (2); a sealing substrate (34) is glued to the surface of the plurality of protruding ridges (31), and an inlet pipe (341) and an outlet pipe (342) are respectively provided on one side of the sealing substrate (34); the inlet pipe (341) and the outlet pipe (342) are distributed on both sides of the protruding ridge (31) in the middle; An adjustment structure (5) is provided at the liquid inlet (341); the adjustment structure (5) includes a magnetic traction structure (51) and a mating ring block (52); the mating ring block (52) is disposed inside the liquid inlet (341); a plurality of adjustment elastic plates (53) are arranged around the inner wall of the mating ring block (52); the magnetic traction structure (51) is looped around the liquid inlet (341); the magnetic ring (511) of the magnetic traction structure (51) drives the mating ring block (52) to reciprocate along the liquid inlet direction, and the plurality of adjustment elastic plates (53) swing accordingly to adjust the liquid inlet volume; Liquid is injected from top to bottom into the liquid flow channel (32) through the inlet port (341); a receiving groove (343) is provided around the inner wall of the inlet port (341); the mating ring block (52) is located in the receiving groove (343) and is located at the top of the receiving groove (343); the mating ring block (52) is coaxially arranged with the inlet port (341); an elastic element (54) is fixedly clamped between the bottom of the mating ring block (52) and the bottom of the receiving groove (343). The magnetic traction structure (51) includes a magnetic ring (511) and a telescopic rod (512); a plurality of the telescopic rods (512) are slidably arranged around the liquid inlet (341); a driving device on the side wall of the cold liquid base plate is drivenly connected to one end of the telescopic rod (512); a magnetic ring (511) is fixed on the other end of the telescopic rod (512); the magnetic ring (511) is arranged corresponding to the position of the mating ring block (52); the magnetic ring (511) is slidably arranged around the liquid inlet (341); the mating ring block (52) is a magnetic structure; the magnetic ring (511) is slidably arranged around the liquid inlet (341); the mating ring block (52) is a magnetic structure; the magnetic ring (511) is slidably arranged around the liquid inlet (341) and a magnetic rod (512 ... The magnetic ring (511) and the corresponding mating ring block (52) are mutually attracted; the receiving groove (343) and the liquid inlet (341) form an active range (344); the telescopic rod (512) drives the mating ring block (52) to move within the active range (344) through the magnetic ring (511), and the mating ring block (52) is compressed by the elastic element (54), the magnetic ring (511) disengages from the mating ring block (52), and the elastic element (54) drives the mating ring block (52) to reset; a plurality of the adjusting elastic plates (53) limit the liquid inlet volume; The magnetic ring (511) drives several adjusting elastic plates (53) to move by cooperating with the ring block (52). The several adjusting elastic plates (53) move along the liquid flow direction, thereby squeezing the liquid that flows through, thus playing a pressurizing role. The pressurized liquid can promote the liquid flow in several liquid channels (32) and avoid the stagnation phenomenon in the liquid channels (32). After the mating ring block (52) and the adjusting elastic piece (53) are released, the elastic element (54) causes the mating ring block (52) to reset, and the magnetic ring (511) will drive the mating ring block (52) to move again next time. The cross-section of several of the adjustable elastic plates (53) is triangular, and the adjustable elastic plates (53) are elastic structures; the acute angle end of several of the adjustable elastic plates (53) is set close to the middle of the mating ring block (52), and the several adjustable elastic plates (53) are circumferentially spliced ​​together, and the gap between the ends of several adjustable elastic plates (53) that are close to each other gradually increases; a support block (55) is provided between the bottom of the adjustable elastic plate (53) and the inner wall of the mating ring block (52), and the support block (55) is an elastic structure; the liquid flow in the liquid inlet (341) drives the adjustable elastic plate (53) to squeeze against the support block (55); when the liquid pushes open several adjustable elastic plates (53), flows into the liquid flow channel (32) through the active area (344), at this time the adjustable elastic plate (53) and the support block (55) have a rebound effect, so that the flow rate of the liquid through the adjustable elastic plate (53) changes; The manufacturing method of the aforementioned battery box is as follows: S1: The square steel is punched out to the designed external dimensions and length using a punching die, and multiple punching cuts are made along the length of the square steel. S2: Bend along the punched cut of the square steel to form a closed frame around it, and fix it with rivets. The four corners of the closed frame and the front and back sides are connected by arc welding. S3: Use a hot melt drilling machine to machine the sealing surface mounting holes on the spliced ​​and welded closed frame; S4: Based on the liquid cooling design structure, mold and vacuum form the liquid cooling base plate and the flow channel PP plate on the liquid cooling base plate; S5: Aluminum plates are punched out according to size requirements and then processed into microstructures by laser processing; S6: Hot-press the PP plate and aluminum plate of the flow channel into shape, and weld the water nozzle at the opening position of the aluminum plate; S7: Glue the liquid-cooled base plate and the closed frame together; S8: Adhere the honeycomb composite panel (41) and the liquid-cooled base plate together and connect them to the closed frame with bolts.

2. The manufacturing method of an integrated liquid-cooled steel battery box according to claim 1, characterized in that: The closed frame joints are spliced ​​to form a zigzag shape; and rivets are used to fix the flanges at the joints.

3. The manufacturing method of an integrated liquid-cooled steel battery box according to claim 2, characterized in that: The middle part of the cold liquid base plate is located inside the closed frame, and the edge of the cold liquid base plate is pressed against the surface of the closed frame; the honeycomb composite plate (41) is connected to the bottom surface of the closed frame; the cold liquid base plate and the honeycomb composite plate (41) enclose the closed frame, and the closed frame is wrapped around the periphery of the cold liquid base plate.

4. The battery case of the integrated liquid-cooled steel battery case according to claim 1, characterized in that: The battery box also includes a frame (1), which is made of hollow square steel bent and assembled; the frame (1) has a notch (11) punched at the bend; an inner side (12) is provided on one side edge of the notch (11); a protrusion (111) and an inner groove (112) are provided on the inner wall of the notch (11); when the notch (11) is bent and assembled, the protrusion (111) is correspondingly assembled in the inner groove (112); the inner side (12) is bent and pressed against the side wall of the square steel; mounting holes (13) are correspondingly opened on the surface and bottom of the frame (1).

5. The battery case of the integrated liquid-cooled steel battery case according to claim 1, characterized in that: The grooved box (2) has an integral fixing ring (21) fixed on its edge; the fixing ring (21) has several corresponding holes (22) through it; the several corresponding holes (22) are coaxially arranged with the mounting holes (13).

6. The battery case of the integrated liquid-cooled steel battery case according to claim 4, characterized in that: The frame (1) has a honeycomb composite panel (41) glued to its bottom surface; the honeycomb composite panel (41) is supported on a cold liquid base plate; the honeycomb composite panel (41) has several fitting holes (4) around its edge; the several fitting holes (4) correspond to several mounting holes (13).

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