An extrusion forming device for battery bottom plate processing

Abstract

The utility model relates to the field of machining discloses a kind of extrusion forming devices for battery bottom plate processing, including control system, extrusion mechanism and auxiliary mechanism.Extrusion mechanism adopts by guide pillar and connect upper crossbeam and lower crossbeam prestressed frame type rack, main oil cylinder drives upper die mounting plate and upper die core along guide pillar and makes up and down movement, and lower die core is cooperated to realize main downward extrusion, fixed in lower die.The multiple auxiliary mechanisms are arranged around extrusion mechanism by screw thread connection, each auxiliary mechanism includes slider driven by auxiliary motor, realizes horizontal motion by ball screw and linear guide rail, slider end is equipped with auxiliary die core, and its both sides are equipped with inclined wedge locking mechanism.The utility model cooperates by main downward extrusion and circumferential lateral auxiliary extrusion, effectively solve the technical problem of material filling not full in complex structure square battery bottom plate one-time forming, with the advantages of high forming quality, stable structure, convenient operation.

Description

Technical Field

[0001] This utility model relates to the field of machining, and in particular to an extrusion molding device for processing battery base plates. Background Technology

[0002] The battery base plate is the core structural and functional component at the bottom of the battery pack system in new energy vehicles. On the one hand, it serves as the mounting base and load-bearing chassis for the entire battery pack, supporting and fixing internal components such as cell modules and battery management systems. It must also possess extremely high mechanical strength to withstand vibrations, impacts, and bottom collisions during vehicle operation. On the other hand, its side facing the inside of the battery pack is usually designed with complex structures such as precisely distributed reinforcing ribs, mounting bosses, and cooling channels to achieve multiple functions such as lightweight structure, precise module positioning, and efficient thermal management. It is a key component that directly affects the safety, energy density, and service life of the battery pack.

[0003] Currently, the manufacturing process of battery base plates for new energy vehicles typically employs a traditional unidirectional pressing molding process. Existing extrusion molding equipment generally consists of a vertical press, an upper die mechanism, and a lower die mechanism. The upper die is driven downward by a main hydraulic cylinder to close with the lower die fixed on the lower crossbeam, applying a single vertical pressure to the metal blank placed between them to form the metal.

[0004] However, existing technologies have the following significant drawbacks in practical applications: Since battery base plates usually have complex side structures, including features such as deep cavities, reinforcing ribs and cooling channels, it is difficult to fully fill the material into all corners of the mold cavity by relying solely on unidirectional pressure in the vertical direction. This can easily lead to quality problems such as incomplete filling, insufficient rib height, and poor structural density, which seriously affect the mechanical strength and heat dissipation performance of the battery base plate. Utility Model Content

[0005] This utility model provides an extrusion molding device for processing battery base plates, which solves the problem that the material cannot be fully filled into the deep cavities and ribs on the side of complex battery base plates, resulting in incomplete product structure and poor density.

[0006] The technical solution adopted by this utility model to solve its technical problem is an extrusion molding device for processing battery base plates, comprising: Control system, extrusion mechanism, and auxiliary mechanisms; The extrusion mechanism constitutes the three-dimensional pressure frame and main forming unit of the device. Its main body is a prestressed frame frame made of high-strength alloy structural steel. This frame is securely connected to the upper and lower crossbeams as a whole by four vertically arranged guide columns. The two ends of the guide columns are locked and fixed to the upper and lower crossbeams by precision threads and pre-tightened with nuts.

[0007] The upper crossbeam serves as the power input for the main downward extrusion, and a main hydraulic cylinder is fixedly connected to its center via a flange. The piston rod of the main hydraulic cylinder extends vertically downward, and its end is threaded to the center of the upper mold mounting plate. The upper mold mounting plate is a rectangular thick steel plate, with linear bearings at its four corners that mate with guide pillars. The upper mold core is detachably fixed to the lower surface of the upper mold mounting plate using hexagonal socket head cap screws. The lower crossbeam is fixed to the base plane of the entire device, and the lower mold body is bolted to its upper part. The lower mold body is a large rectangular block, with the lower mold core embedded and fixed within the upper surface cavity of the lower mold body. For smooth demolding, an ejection system is installed inside the lower mold body. Specifically, multiple ejector rods vertically penetrate the lower mold body and the lower mold core, with their lower ends fixed to an ejector plate. The ejector plate is driven by an ejector cylinder located at the center of the lower crossbeam.

[0008] Each auxiliary mechanism comprises an independent auxiliary frame, which is securely fixed to the four sides of the lower crossbeam via mounting flanges and bolts at its bottom. The auxiliary frame integrates a precision linear drive unit. This unit is powered by an auxiliary motor, which drives a precision ball screw via a coupling. A matching nut seat is fitted onto the screw, rigidly connecting it to the slider. The auxiliary frame also features a high-precision linear guide rail, with the slider slidingly engaged with it. An auxiliary die core is bolted to the end of the slider closest to the center of the extrusion mechanism. To ensure the slider remains stable and does not retract during the powerful downward extrusion process, symmetrical wedge blocks are arranged on both sides of the slider's horizontal plane.

[0009] The beneficial effects of this utility model are as follows: It provides an extrusion molding device for battery base plate processing. Through the synergistic effect of main downward extrusion and circumferential multi-directional lateral auxiliary extrusion, it ensures that square battery base plates with complex ribs and deep cavity structures can be completely filled and molded in one go, which significantly improves the structural integrity and dimensional accuracy of the product. The independent lateral auxiliary extrusion unit, combined with the inclined wedge mechanical self-locking mechanism, effectively prevents pressure back during the extrusion process and ensures molding stability. The split mold design and automatic ejection system make mold maintenance and product demolding more convenient and efficient. The overall device has a reasonable structure, a high degree of automation, and is suitable for large-scale production. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the extrusion molding device for processing battery base plates according to this utility model; Figure 2 This is a front view of the extrusion molding apparatus for processing battery base plates according to this utility model; Figure 3 This is a schematic diagram of the extrusion mechanism of the extrusion molding device for processing battery base plates according to this utility model; Figure 4This is a schematic diagram of the auxiliary mechanism of the extrusion molding device for processing battery base plates according to this utility model.

[0011] Explanation of reference numerals in the attached figures: 100. Control system; 200. Extrusion mechanism; 210. Main hydraulic cylinder; 220. Upper crossbeam; 230. Upper mold mounting plate; 240. Upper mold core; 250. Ejection cylinder; 260. Lower crossbeam; 270. Lower mold body; 280. Lower mold core; 290. Ejection plate; 2100. Guide pillar; 300, Auxiliary mechanism; 310, Auxiliary motor; 320, Auxiliary frame; 330, Slider; 331, Auxiliary mold core; 332, Wedge block. Detailed Implementation

[0012] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0013] like Figures 1 to 4 As shown in the figure, this utility model provides an extrusion molding device for processing battery base plates, which realizes one-time efficient and precise molding of complex square battery base plates. This device effectively solves the technical problems of poor material flow and incomplete filling of ribs and deep cavities in traditional processes through the synergistic effect of a unique main downward extrusion and circumferential lateral auxiliary extrusion. The entire device mainly includes a control system 100, an extrusion mechanism 200 as the core molding unit, and an auxiliary mechanism 300 that realizes the lateral auxiliary extrusion function. The components are connected by precise mechanical connections and power transmission, forming a rigid and coordinated organic whole. In one specific embodiment, the extrusion mechanism 200 constitutes the three-dimensional pressure frame and main forming unit of the device. Its main body is a prestressed frame frame made of high-strength alloy structural steel. This frame is securely connected to the upper crossbeam 220 and lower crossbeam 260 as a whole by four vertically arranged guide pillars 2100. The two ends of the guide pillars 2100 are locked and fixed to the upper crossbeam 220 and lower crossbeam 260 by precision threads and pre-tightened with nuts, ensuring that the entire frame maintains extremely high stability and rigidity even under enormous working pressure, providing a solid guarantee for the precise mold closing of the upper mold core 240 and lower mold core 280. In one specific embodiment, the upper crossbeam 220 serves as the power input end for the main downward extrusion, and a main hydraulic cylinder 210 is fixedly connected to its center via a flange. The piston rod of the main hydraulic cylinder 210 extends vertically downward, and its end is connected to the center of the upper mold mounting plate 230 via a thread. The upper mold mounting plate 230 is a rectangular thick steel plate, with linear bearings at its four corners that mate with the guide pillars 2100, ensuring that it can make precise up-and-down reciprocating movements along the guide pillars 2100 under the drive of the main hydraulic cylinder 210, without any deflection or jamming. The upper mold core 240 is detachably fixed to the lower surface of the upper mold mounting plate 230 by hexagonal socket head cap screws. The working surface of the upper mold core 240 is precision machined according to the front features of the target battery base plate product, and may include structures such as planes, shallow grooves, or positioning protrusions. The lower crossbeam 260 is fixed to the base plane of the entire device, and the lower mold body 270 is fixedly mounted on its upper part by bolts. The lower mold body 270 is a large rectangular block made of hot-work die steel and heat-treated to achieve high hardness and wear resistance. The lower mold core 280 is embedded and fixed within the upper surface cavity of the lower mold body 270, and its profile forms the main shape of the back of the battery base plate, including complex structures such as reinforcing ribs, mounting bosses, and cooling channel grooves. This separate design of the upper mold core 240 and the lower mold core 280 greatly facilitates mold processing, heat treatment, and subsequent maintenance and replacement. For smooth demolding, an ejection system is provided inside the lower mold body 270. Specifically, multiple ejector pins vertically penetrate the lower mold body 270 and the lower mold core 280, with their lower ends fixed to the ejector plate 290. The ejector plate 290 is driven by an ejector cylinder 250 located at the center of the lower crossbeam 260. When the molding process is completed and the upper mold is opened, the ejector cylinder 250 is activated, pushing the ejector plate 290 and the ejector rod upward to smoothly and evenly eject the molded battery base plate product from the lower mold core 280, thus completing the demolding. In one specific embodiment, to achieve lateral assisted extrusion, multiple auxiliary mechanisms 300 are evenly arranged around the extrusion mechanism 200 via threaded connections. Each auxiliary mechanism 300 includes an independent auxiliary frame 320, which is securely fixed to the sides of the lower crossbeam 260 via mounting flanges and bolts at its bottom, ensuring no displacement or vibration during operation. The auxiliary frame 320 integrates a precision linear drive unit. This unit is powered by an auxiliary motor 310, which drives a precision ball screw via a coupling. A nut seat is fitted onto the screw, and this nut seat is rigidly connected to the slider 330. The auxiliary frame 320 also features a high-precision linear guide rail, with the slider 330 slidingly engaging with it. An auxiliary die core 331 is bolted to the end of the slider 330 closest to the center of the extrusion mechanism 200. The working end face shape of the auxiliary mold core 331 complements the shape of the deep cavity or high rib on the side of the battery base plate. Its function is to push the material from the side into the hard-to-fill area of ​​the mold cavity while the main downward extrusion is underway. To ensure that the slider 330 remains stable and does not retract during the powerful main downward extrusion process, symmetrical wedges 332 are arranged on both sides of the horizontal plane of the slider 330. When the slider 330 advances to the working end point, the wedges 332 fit tightly with the corresponding wedge-shaped surface on the workpiece, generating a mechanical self-locking effect, thereby firmly locking the slider 330 in the current position and bearing the reverse pressure from the main forming direction; The working process of this utility model is as follows: The working process of an extrusion molding device for battery base plate processing is divided into a mold closing stage, a collaborative extrusion stage, and a demolding stage. Mold Closing Stage: The square aluminum alloy blank, heated to a plastic state, is accurately placed by a robotic arm into the center positioning area of ​​the upper surface of the lower mold core 280. At this time, the piston rod of the main hydraulic cylinder 210 is in a fully retracted state, causing the upper mold mounting plate 230 and the upper mold core 240 to stop at the upper limit position. All auxiliary motors 310 are in standby mode, driving the slider 330 and auxiliary mold core 331 to return to the initial position away from the mold center. The piston rod of the ejector cylinder 250 retracts, causing the ejector plate 290 and ejector rod to be in the lower position; Collaborative extrusion stage: The control system 100 issues a command, and the piston rod of the main cylinder 210 begins to extend downward. The piston rod, through a threaded connection at its end, drives the upper die mounting plate 230 to move linearly downward along the four guide pillars 2100. The upper die core 240, fixed to the bottom surface of the upper die mounting plate 230, moves downward synchronously. After the upper die core 240 contacts the blank, it continues to descend, closing with the lower die core 280 fixed to the lower die body 270, applying vertical main forming pressure to the blank placed between them for preliminary shaping. All auxiliary mechanisms 300 arranged around the device start synchronously. Each auxiliary motor 310 receives a signal and begins to rotate, driving the precision ball screw through a coupling. The slider 330, rigidly connected to the screw nut, moves precisely in a straight line horizontally towards the center of the extrusion mechanism 200 under the constraint of the linear guide rail. The auxiliary mold core 331, fixed to the end of the slider 330, advances synchronously, contacting the blank from the side and extruding the plastic material into the deep cavity and high-rib area designed on the side of the battery base plate. After the slider 330 reaches the preset end position, the symmetrically arranged wedge blocks 332 on both sides of its horizontal plane fit tightly with the corresponding wedge groove surface on the auxiliary frame 320, forming an interference fit. After extrusion, the control system 100 first instructs all auxiliary motors 310 to rotate in the opposite direction, driving the ball screw to move the slider 330 and the auxiliary mold core 331 horizontally outward back to the initial position. The wedge blocks 332 then disengage from the locking state of the wedge groove surface. Subsequently, the piston rod of the main cylinder 210 begins to retract, driving the upper mold core 240 to move upward along the guide post 2100 through the upper mold mounting plate 230, separating from the lower mold core 280; Demolding Stage: After the upper mold core 240 is fully reset, the control system 100 sends an action command to the ejector cylinder 250. The piston rod of the ejector cylinder 250 extends upward, pushing the ejector plate 290 upward. Multiple ejector rods fixed to the ejector plate 290 rise synchronously. These ejector rods penetrate the pre-drilled channels on the lower mold body 270 and the lower mold core 280, ultimately acting on the lower surface of the formed battery base plate product, smoothly and evenly ejecting it from the cavity of the lower mold core 280. The robotic arm then removes the product, completing the entire work cycle. Finally, the piston rod of the ejector cylinder 250 retracts, resetting the ejection system and preparing for the next work cycle. The above-disclosed embodiments are merely specific examples of this utility model. However, the embodiments of this utility model are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. An extrusion molding apparatus for processing battery base plates, comprising a control system (100) and an extrusion mechanism (200), characterized in that: It also includes an auxiliary mechanism (300) disposed on the extrusion mechanism (200). The extrusion mechanism (200) includes an upper crossbeam (220) and a lower crossbeam (260) connected by a guide post (2100). A main hydraulic cylinder (210) is provided at the center of the upper crossbeam (220). The piston rod of the main hydraulic cylinder (210) is connected downward to the upper mold mounting plate (230). An upper mold core (240) is installed at the bottom of the upper mold mounting plate (230). A lower mold body (27) is installed on the upper part of the lower crossbeam (260). 0), the lower mold body (270) is provided with a lower mold core (280); the auxiliary mechanism (300) is provided in multiple ways and arranged around the extrusion mechanism (200), each auxiliary mechanism (300) includes an auxiliary frame (320) fixed on the lower crossbeam (260), the auxiliary frame (320) is provided with a slider (330) driven by an auxiliary motor (310), the slider (330) is equipped with an auxiliary mold core (331), and the slider (330) is provided with inclined wedges (332) on both sides.

2. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The number of guide posts (2100) is four, which are vertically distributed between the upper crossbeam (220) and the lower crossbeam (260).

3. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The upper mold mounting plate (230) is provided with linear bearings at its four corners that cooperate with the guide pillars (2100).

4. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The auxiliary frame (320) is fixed to the four sides of the lower crossbeam (260) by the mounting flange at the bottom and bolts.

5. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The auxiliary frame (320) is equipped with a precision ball screw and a linear guide rail. The slider (330) is rigidly connected to the nut seat of the ball screw and slides with the linear guide rail.

6. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The wedge blocks (332) are symmetrically arranged on both sides of the horizontal plane of the slider (330).

7. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The lower mold body (270) is equipped with an ejection system, including an ejection cylinder (250), an ejection plate (290), and multiple ejector rods.

8. The extrusion molding apparatus for processing battery base plates according to claim 7, characterized in that: The ejector cylinder (250) is located at the center of the lower crossbeam (260), and its piston rod is connected upward to the ejector plate (290).

9. The extrusion molding apparatus for processing battery base plates according to claim 8, characterized in that: The ejector pin vertically penetrates the lower mold body (270) and the lower mold core (280), and its lower end is fixed on the ejector plate (290).

10. The extrusion molding apparatus for processing battery base plates according to claim 1, characterized in that: The upper mold core (240) is detachably fixed to the lower surface of the upper mold mounting plate (230) by means of hexagon socket screws.

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