WO2025178165A1 - Apparatus for supplying fixed quantity of electrode material powder - Google Patents

Abstract

The present invention relates to an apparatus for supplying a fixed quantity of an electrode material powder. The apparatus comprises: a hopper, which accommodates electrode material powder provided from the outside and discharges same downward; a first conveyor which is provided below the hopper, and which receives and transfers the electrode material powder discharged from the hopper; a transfer amount adjustment means for adjusting a transfer amount of the electrode material powder transferred through the first conveyor; a second conveyor for receiving and transferring the electrode material powder that passed through the first conveyor; and a pressing unit, which presses the electrode material powder transferred from the second conveyor so as to shape same into a film having a predetermined thickness. The apparatus for supplying a fixed quantity of an electrode material powder, according to the present invention, can adjust, in real time, a supply amount of an electrode material powder, and enables the manufacture of a dry electrode film with a uniform density and thickness by supplying an accurate volume of powder.

Description

Electrode powder quantitative supply device

The present invention relates to a powder quantitative supply device for electrode materials, and more specifically, to a powder quantitative supply device for electrode materials that enables real-time control of the supply amount of the powder and manufacture of a dry electrode film with uniform density and thickness through supply of an accurate volume of powder.

Unlike disposable primary batteries, lithium secondary batteries can be recharged and reused repeatedly. They boast higher output and superior charge-discharge performance compared to other secondary batteries. Consequently, they are widely used in a variety of fields, from mobile IT devices like smartphones and laptops to power sources for electric vehicles and storage devices for power generated by wind and solar power.

Secondary batteries are composed of four major components: a cathode, an anode, an electrolyte, and a separator. The cathode and anode are each manufactured by dispersing or dissolving active materials, conductive materials, and binders in a solvent to create a slurry. This slurry is then coated onto a current collector, followed by an electrode process that includes drying, pressing, slitting, and notching. The resulting electrode is then assembled and activated to form a secondary battery cell.

However, as mentioned above, the wet electrode manufacturing method using a solvent may cause defects such as pinholes or cracks during the drying process.

Pinholes and cracks occur as the solvent evaporates. Additionally, powder floating occurs due to differences in solvent evaporation rates, which degrades electrode quality.

To address the aforementioned issues, a dry manufacturing method for manufacturing electrodes without using solvents is known. This dry manufacturing method involves passing electrode powder containing an active material, a binder, and a conductive material through a calender roll. The electrode powder, having passed through the calender roll, is laminated and fixed to a current collector as a dry electrode film of a certain thickness.

In this regard, Korean Patent Publication No. 10-2022-0052852 (Electrode powder for manufacturing dry electrode for secondary battery, manufacturing method thereof, manufacturing method of dry electrode using same, dry electrode, secondary battery including same, energy storage device, and dry electrode manufacturing device) has been disclosed.

The disclosed dry electrode manufacturing device is a dry electrode manufacturing device, and comprises: a blender for mixing raw materials for a mixture including an active material, a conductive material, and a binder; a kneader for kneading the mixture to form a mixture lump to fiberize the binder; a crusher for crushing the mixture lump to form an electrode powder; a calender for forming the electrode powder into a mixture film; and a lamination roll for positioning and laminating the mixture film on at least one surface of a current collector.

Meanwhile, the uniformity of thickness and density in the composite film described above is crucial. Thickness and density must be uniform throughout, without any local variations. To achieve this uniformity, a quantitative supply of electrode powder, i.e., electrode material powder, is crucial. However, conventional dry electrode manufacturing equipment lacks the technology to quantitatively supply electrode material powder.

The present invention was created to solve the above problems, and the purpose is to provide an electrode powder quantitative supply device that enables real-time control of the supply amount of electrode powder and manufacture of a dry electrode film of uniform density and thickness through supply of an accurate volume of powder.

As a technical solution for achieving the above object, the electrode material powder quantitative supply device of the present invention includes a hopper that receives electrode material powder provided from the outside and discharges it downward; a first conveyor installed at the bottom of the hopper that receives and conveys the electrode material powder discharged from the hopper; a conveyance control means that controls the conveyance of the electrode material powder conveyed through the first conveyor; a second conveyor that receives and conveys the electrode material powder that has passed through the first conveyor; and a pressing unit that pressurizes the electrode material powder conveyed from the second conveyor and forms it into a film shape of a predetermined thickness.

Additionally, the hopper is equipped with a vibrator that induces discharge of electrode powder.

The above first conveyor comprises a drive roll that rotates by receiving power from a drive unit, a driven roll arranged corresponding to the drive roll, and a discharge belt that is supported by the drive roll and the driven roll and rotates, and a plurality of powder receiving grooves for receiving electrode powder discharged from a hopper are formed on the surface of the discharge belt.

The above powder receiving groove extends in the width direction of the conveying belt, has a constant pitch interval, and provides a space of the same volume.

The above-mentioned transport amount control means controls the transport amount of electrode powder by removing the upper part of the electrode powder during transport, and includes a blade that can be raised and lowered on a transport belt, and a height control unit that raises and lowers the blade to control the gap between the blades with respect to the transport belt.

At the end of the first conveyor, a first brushing unit is provided to shake off the electrode powder in the powder receiving groove and drop the electrode powder onto the second conveyor.

The above second conveyor is equipped with a drive roll that rotates by receiving rotational force from a drive unit, a driven roll arranged corresponding to the drive roll, and a conveying belt that is wound around the drive roll and the driven roll and rotates, and a rough portion is formed on the surface of the conveying belt to prevent slipping of the electrode powder.

The above pressing unit includes a pair of pressure rolls spaced apart at a certain interval and passing and pressing electrode powder.

The electrode material powder quantitative supply device of the present invention, which is constructed as described above, not only enables real-time control of the supply amount of electrode material powder, but also enables the production of a dry electrode film of uniform density and thickness through the supply of an accurate volume of powder.

In addition, since a certain amount of powder can be continuously supplied in the longitudinal direction, an electrode film of a certain thickness in the longitudinal direction can be manufactured.

Figure 1 is a perspective view of an electrode material powder quantitative supply device according to one embodiment of the present invention.

Fig. 2 is a drawing for explaining the overall configuration and operation method of the quantitative supply device shown in Fig. 1.

Figure 3 is a drawing for explaining the interlocking method of the first and second brushes of Figure 2.

Figure 4 is a drawing showing the detailed configuration of the hopper shown in Figure 2.

Figure 5 is a block diagram for explaining the operation of the hopper of Figure 4.

Figure 6 is a drawing showing the configuration of the scraper illustrated in Figure 2.

FIG. 7a and FIG. 7b are drawings for explaining a method for controlling the supply amount of electrode material powder through the scraper of FIG. 6.

Fig. 8 is a drawing for explaining the operation of the first brushing unit of Fig. 2.

Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the attached drawings.

FIG. 1 is a perspective view of an electrode powder quantitative supply device (10) according to one embodiment of the present invention, and FIG. 2 is a drawing for explaining the overall configuration and operation method of the quantitative supply device. In addition, FIG. 3 is a drawing for explaining the interlocking method of the first and second brushes of FIG. 2. In addition, FIG. 4 is a drawing for illustrating a detailed configuration of the hopper illustrated in FIG. 2, and FIG. 5 is a block diagram for explaining the operation of the hopper of FIG. 4. In addition, FIG. 6 is a drawing showing the configuration of the scraper illustrated in FIG. 2, and FIGS. 7a and 7b are drawings for explaining a method for controlling the supply amount of electrode powder through the scraper of FIG. 6. In addition, FIG. 8 is a drawing for explaining the operation of the first brushing unit (37) of FIG. 2.

As shown, the electrode material powder quantitative supply device (10) according to the present embodiment has a support structure (11), a hopper (13), a first conveyor (30), a transfer amount control means, a second conveyor (40), and a pressing unit.

The support structure (11) includes two vertical fixing plates (11a) having a certain thickness. The vertical fixing plates (11a) are spaced apart from each other in parallel, and accommodate the above-mentioned hopper, first and second conveyors, and the transport amount control means therebetween, and provide support.

The hopper (13) receives electrode powder (100) provided from the outside and discharges it downward through the outlet (13c). The outlet is inclined at an angle θ with respect to the horizontal floor surface. The angle may be 5 to 15 degrees. The hopper (13) may have a funnel shape. In this case, the angle between the hoppers may be designed to be less than 90 degrees, for example, 50 to 80 degrees. If the angle between the hoppers is 90 degrees or more, a problem may occur in which the electrode powders clump together and cannot descend, and if the angle between the hoppers is too small, the hopper cannot be filled with the required amount of electrode powder.

The space (13a) of the hopper (13) is a space formed by a vertical fixed plate (11a) and two inclined plates (13b). The inclined plates (13b) are plate-shaped members having an angle of approximately 60 degrees and correspond to each other. Ultimately, the hopper (13) is an element formed by a portion of the vertical fixed plate (11a) and the inclined plates (13b).

In addition, an observation window (12) is provided in the portion of the vertical fixing plate (11a) that covers the space portion (13a). The observation window (12) is a transparent window that shows the remaining amount of electrode powder (100) contained in the space portion (13a) to the outside. The operator can check the remaining amount of electrode powder (100) at any time through the observation window (12).

And, one or more level sensors (15) are installed on the hopper inner inclined plate (13b) or the vertical fixed plate (11a) forming the space (13a) that forms the hopper. The level sensor (15) senses the remaining amount of electrode powder (100) and transmits the sensing information to the controller (21). The worker can also check the remaining amount of electrode powder (100) provided in real time from the controller (21) by wirelessly connecting with a smartphone.

In addition, a vibrator (17) is mounted on the two-sided inclined plates (13b) to induce discharge of the electrode powder (100). The vibrator (17) applies vibration energy to the hopper (13) to facilitate discharge of the electrode powder (100). For example, when the electrode powder (100) is clumped together and does not flow down easily, the vibration is strengthened to induce discharge. The vibrator (17) is also controlled by the controller (21).

A pressurizing unit (19) is installed on the upper part of the hopper (13). The pressurizing unit (19) is supported on the upper part of the inclined plate (13b) and the vertical fixing plate (11a) and seals the space (13a). The pressurizing unit (19) regulates the pressure inside the space (13a) so that the electrode powder (100) is discharged at a constant pressure.

The outlet of the hopper from which the electrode powder is discharged can be formed to have the same gap as the discharge belt, and the outlet of the hopper can be formed to have the same slope as the discharge belt.

The electrode powder (100) falls downward due to the action of gravity and is loaded onto the first conveyor (30), more precisely, onto the discharge belt of the first conveyor. When the amount of electrode powder (100) in the space (13a) is large, the total weight is heavy and it is discharged with a relatively large pressure (compared to when there is not much remaining amount). In other words, there is bound to be a difference between the pressure pressing the first conveyor (30) when there is not much remaining electrode powder (100) and the pressure pressing the first conveyor when there is a relatively large remaining amount of electrode powder (100).

The pressurizing unit (19) serves to reduce this pressure difference. That is, it increases the pressure inside the space (13a) in accordance with the gradual decrease in the remaining amount of electrode powder (100) within the space (13a). As the pressure in the space increases, the increased pressure pushes the electrode powder (100) downward, so that the force applied to the first conveyor is ultimately constant. The pressurizing unit (19) is also controlled by the controller (21).

The above pressurizing unit (19) can provide pressure to the electrode powder without directly contacting the electrode powder in a non-contact manner. In this case, the pressurizing unit (19) can control the pressure of the electrode powder by supplying air at a certain pressure toward the hopper. By providing pressure to the electrode powder in a non-contact manner, the agglomeration of the electrode powder can be prevented. Meanwhile, the pressurizing unit can also provide pressure by directly contacting the electrode powder.

The first conveyor (30) is installed at the bottom of the hopper (13) and receives the electrode powder discharged from the hopper and transports it in the direction of arrow a.

The first conveyor (30) includes a driving unit (31), a driving roll (32), a driven roll (33), and a discharge belt (35).

The driving unit (31) is fixed to the outside of a vertical fixing plate (11a) on one side and outputs rotational force. The driving unit (31) includes a servo motor (31a) and a reducer (31b). The servo motor (31a) is operated by a controller (21). The rotational speed of the servo motor (31a) is controlled by the controller (21).

The drive roll (32) is supported at both ends so as to be axially rotatably supported on a vertical fixed plate (11a) and rotates by receiving rotational force from a reducer.

In addition, the driven roll (33) corresponds to the drive roll (32) and is placed at a relatively lower altitude than the drive roll (32). The straight line connecting the drive roll (32) and the driven roll (33) is equal to the inclination angle θ of the outlet (13c) of the hopper (13). In addition, a driven roll gear (34) is mounted on one end of the driven roll (33). The driven roll gear (34) is located on the outside of the vertical fixing plate (11a), rotates simultaneously with the driven roll (33), and meshes with the brush gear (38) described later.

The take-out belt (35) is a belt that is supported by a driven roll, a driving roll, and a driven roll and moves in a circular motion. The take-out belt (35) moves in a circular motion while being straddled by the driving roll (32) and the driven roll (33) and transports the electrode powder (100) in the direction of arrow a. The electrode powder (100) transported by the first conveyor (30) moves to the second conveyor (40) and then passes through the pressing section (50) and is rolled into a film shape.

In particular, a powder receiving groove (35b) is formed on the surface of the discharge belt (35). The powder receiving groove (35b) is a groove that receives electrode powder discharged from the hopper (13). The powder receiving groove (35b) extends in the width direction of the discharge belt (35) and has a constant pitch interval.

The electrode powder (100) discharged from the hopper (13) is transported in a state accommodated in the powder receiving grooves (35b). The volume of all powder receiving grooves (35b) is the same. Therefore, as illustrated in Fig. 7a, if each powder receiving groove (35b) is completely filled with the electrode powder (100), the volume of the electrode powder (100) can be calculated through calculation with the rotation speed of the discharge belt (35). Naturally, the faster the rotation speed of the discharge belt (35), the larger the discharge volume of the electrode powder (100).

The powder receiving grooves (35b) are formed with the same size and at the same intervals in the longitudinal direction of the discharge belt (35). Accordingly, the same capacity of electrode powder can be moved in the longitudinal direction of the discharge belt. Consequently, an electrode film with the same thickness can be formed in the longitudinal direction.

Another method for controlling the amount of electrode powder (100) transported per unit time is to control the height of the electrode powder (100) (H in FIG. 7b). Under the condition that the rotation speed of the transport belt is the same, the higher the height (H) of the electrode powder (100) from the protrusion (35c) of the transport belt (35), the greater the amount transported. The height (H) is controlled by a scraper (25), which is a height control part described later.

Ultimately, when the rotation speed of the transport belt (35) and the loading height (H) of the electrode powder (100) are simultaneously adjusted, the transport amount of the electrode powder (100) can be freely adjusted.

Meanwhile, the transport amount control means controls the transport amount of electrode powder transported through the first conveyor (30). That is, the upper part of the electrode powder coming out from the lower part of the hopper (13) on the discharge belt (35) is removed to control the transport amount of the electrode powder.

The transport amount control means has a blade (25e) and a height control unit, as shown in Fig. 6. The height control unit also includes a height control motor (25a), a screw rod (25b), and a carrier (25c).

The height adjustment motor (25a) is a thermomotor operated by the controller (21). The height adjustment motor (25a) is mounted on the outer lower part of the hopper's inclined plate (13b). The height adjustment motor (25a) operates by receiving a control signal from the controller (21) to rotate the screw rod (25b) in both directions.

The screw rod (25b) is a lead screw with a male thread formed thereon and engages with the carrier (25c). The carrier (25c) moves linearly by the axial rotation of the screw rod (25b). In addition, the carrier (25c) is engaged with the blade (25e). Depending on the linear movement of the carrier (25c), the blade (25e) can descend in the direction of arrow d or rise in the opposite direction.

The blade (25e) is a plate-shaped member that is raised and lowered by a height adjustment motor (25a). The electrode powder (100) that is carried on the discharge belt (35) and exits the hopper (13) passes through the lower part of the blade (25e). The height (H in FIG. 7b) can be adjusted by adjusting the position of the blade (25e). FIG. 6 shows a state in which the blade (25e) is lowered to the maximum extent so that the lower part of the blade (25e) almost touches the protrusion (35c). The blade (25e) can be manufactured from an elastically deformable material such as silicone or rubber. In some cases, it can also be manufactured from a metal plate.

As described above, Fig. 7a shows the appearance of the discharge belt (35) passing through the lower part of the blade (25e) with the lower part of the blade (25e) as close as possible to the protrusion (35c). The electrode powder (100) is removed as much as possible and is accommodated only in the powder accommodation groove (35b).

Also, Fig. 7b shows the appearance of the discharge belt (35) that passes through the lower part of the blade (25e) while the blade (25e) is raised to a height H. As shown, the upper surface of the electrode powder (100) is raised from the protrusion (35c) to a height H.

Drawing reference numeral 27 in Fig. 2 is a sagging prevention unit. The sagging prevention unit (27) prevents the discharge belt (35) from sagging downward due to the weight of the electrode powder (100). The configuration of the sagging prevention unit may vary as long as it can perform this role. The sagging prevention unit (27) in the present embodiment is composed of a plurality of support rolls (27a). The support rolls (27a) support the discharge belt (35) in a state where they are packed as densely as possible. The support rolls (27a) reduce friction with the discharge belt (35), thereby preventing damage to the discharge belt.

In contrast, the sagging prevention member may support the export belt (35) in the shape of a rigid plate.

A first brushing unit (37) is provided at the end of the first conveyor (30). The first brushing unit (37) sweeps away the electrode powder (100) within the powder receiving groove (35b) so that the electrode powder falls to the second conveyor (40) without any residue. When the discharge belt (35) winds around the driven roll (33), most of the electrode powder (100) falls due to gravity and moves to the second conveyor (40). However, the electrode powder within the powder receiving groove (35b) may remain within the powder receiving groove (35b) due to its own clumping properties. The first brushing unit (37) sweeps away the remaining electrode powder from the powder receiving groove (35b).

The first brushing unit (37) includes a brush shaft (37a), a bristles (37b), and a brush gear (38). The brush shaft (37a) is a shaft with both ends rotatably installed on a vertical fixing plate (11a), and one end is fixed to the brush gear (38). The brush gear (38) meshes with the driven roller gear (34), so that the brush shaft (37a) rotates simultaneously when the first conveyor (30) is in operation.

The bristle (37b) is, so to speak, a brush hair fixed to the brush shaft (37a). As shown in Fig. 8, when the brush shaft (37a) rotates, the bristle (37b) reaches the inside of the powder receiving groove (35b) and shakes off the remaining electrode material powder (100) within the powder receiving groove. The bristle (37b) can be manufactured from various materials.

Meanwhile, the second conveyor (40) serves to transport the electrode powder delivered from the first conveyor (30) to the pressing section (50).

The second conveyor (40) is equipped with a driving unit (41), a driving roll (42), a driven roll (43), and a transfer belt (45).

The driving unit (41) has a servo motor (41a) and a reducer (41b). The servo motor (41a) receives a control signal from the controller (21) and outputs rotational force. The rotational force of the servo motor (41a) is transmitted to the driving roll (42) through the reducer (41b).

The drive roll (42) rotates by receiving rotational force from the drive unit (41). Both ends of the drive roll (42) are supported so as to be able to rotate about an axis on a vertical fixing plate (11a).

In addition, the driven roll (43) is arranged corresponding to the drive roll (42), and like the drive roll, both ends are supported so as to be axially rotatably on a vertical fixing plate (11a). The driven roll (43) is located at a lower height than the drive roll (42).

In addition, a driven roll gear (44) is mounted on one end of the driven roll (43). The driven roll gear (44) is located on the outside of one side of the vertical fixed plate (11a), rotates simultaneously with the driven roll (43), and meshes with the brush gear (48) described later.

The conveying belt (45) is a member that is wound around a driving roll (42) and a driven roll (43) and performs circular motion. In addition, a protruding portion (45a) is formed on the surface of the conveying belt (45). The protruding portion (45a) prevents the electrode powder from slipping. For example, it prevents the electrode powder from falling out in the width direction of the conveying belt (45). The shape of the protruding portion (45a) can be varied as much as possible as long as it can perform this role. Since the protruding portion (45a) functions to stably move the electrode powder, the depth of the protruding portion (45a) can be smaller than that of the powder receiving groove (35b) and can be formed more densely. The take-out belt (35) and the conveying belt (45) can be made of a material in which polyurethane protrusions are attached to a plastic material such as nylon. However, it is natural that the above-mentioned export belt (35) and transport belt (45) are made of various materials.

In addition, by adjusting the speed of the discharge belt (35) and the conveying belt (45), the supply amount of electrode powder can be controlled. For example, if the speed of the conveying belt is set slower than that of the discharge belt, the electrode powder accumulated on the conveying belt increases, and accordingly, a larger amount of electrode powder can be conveyed in the direction of the first and second pressure rolls.

That is, the quantitative supply of electrode material powder can be controlled by adjusting the height of the blade (25e) and by varying the speed of the discharge belt (35) and the conveying belt (45).

The second conveyor (40) transports the electrode powder delivered from the first conveyor (30) in the direction of arrow e and delivers it to the pressing unit (50). The second conveyor (40) is inclined at an angle of approximately 10 degrees with respect to the horizontal floor surface.

In addition, a second brushing unit (47) is provided at the end of the second conveyor (40). The second brushing unit (47) serves to brush away the remaining electrode powder attached to the conveying belt (45). When the conveying belt (45) winds around the driven roll (43), most of the electrode powder falls due to gravity, but some of the electrode powder may remain on the conveying belt (45). This brushing unit brushes away the remaining electrode powder.

The structure of the second brushing unit (47) is the same as that of the first brushing unit. That is, the second brushing unit (47) has a brush shaft (47a), a brush gear (48), and a bristles (47b). The brush shaft (47a) is a shaft that is rotatably supported on a vertical fixing plate (11a) and has a brush gear (48) at one end. The brush gear (48) receives rotational force from the driven roller gear (44). The bristles (47b) are hairs fixed to the brush shaft (47a) and brush off residues attached to the uneven portion (45a) of the conveying belt (45) downward.

Meanwhile, the pressing unit (50) pressurizes the electrode powder delivered from the second conveyor and forms the electrode powder into a film of a certain thickness.

The pressing unit (50) includes a first pressure roll (51), a first roll driving unit (52), a second pressure roll (55), and a second roll driving unit (56).

The first pressure roll (51) and the second pressure roll (55) are arranged parallel and spaced apart from each other by a certain distance. The gap between the first pressure roll (51) and the second pressure roll (55) is adjustable. In addition, the first pressure roll (51) is operated by the first roll driving unit (52), and the second pressure roll (55) is operated by the second roll driving unit (56). The first roll driving unit (52) and the second roll driving unit (56) operate independently. The first pressure roll and the second pressure roll have opposite rotation directions.

The ratio of the rotation speeds of the first and second pressure rolls (51, 55) can be combined in various ways. In this case, when the speed of the first pressure roll (51) is 1, it is preferable to adjust the speed of the second pressure roll (55) to 1 or higher, for example, 1.2 to 2. When the speed of the second pressure roll is faster than that of the first pressure roll, the electrode material powder (100) is separated from the first pressure roll and adheres to the second pressure roll, allowing it to move along the second pressure roll.

The first pressure roll and the second pressure roll may each be made of a special steel material with chrome plating on the surface.

The first pressure roll (51) and the second pressure roll (55) pass the electrode material powder (100) delivered from the second conveyor (40) through them and form it into a film of a certain thickness. The film-shaped electrode material (70) that has passed through the first and second pressure rolls (51, 55) can be pressed into a thinner thickness through a subsequent process.

Above, the present invention has been described in detail through specific examples, but the present invention is not limited to the above examples, and various modifications are possible by a person of ordinary skill within the scope of the technical idea of the present invention.

Not only is it possible to control the real-time supply amount of electrode powder, but it is also possible to manufacture a dry electrode film with uniform density and thickness through supplying an accurate volume of powder, making it industrially applicable.

Claims (13)

A hopper that receives electrode powder provided from outside and discharges it downward; A first conveyor installed at the bottom of the hopper and receiving and transporting electrode powder discharged from the hopper; A conveyance control means for controlling the conveyance amount of electrode powder conveyed through the first conveyor; A second conveyor arranged below the first conveyor to receive and transport the electrode powder transported through the first conveyor; A pressing unit is included that pressurizes the electrode powder delivered from the second conveyor and forms it into a film of a certain thickness. Electrode material powder quantitative supply device. In the first paragraph, The above hopper is equipped with a vibrator that induces discharge of electrode powder. Electrode material powder quantitative supply device. In the first paragraph, The above first conveyor; It has a drive roll that rotates by receiving power from a drive unit, a driven roll arranged corresponding to the drive roll, and a delivery belt that is supported by the drive roll and the driven roll and performs a circular motion. On the surface of the above-mentioned discharge belt, a number of powder receiving grooves are formed to receive electrode powder discharged from the hopper. Electrode material powder quantitative supply device. In the third paragraph, The above powder receiving groove extends in the width direction of the discharge belt and has a constant pitch interval, providing a space of the same volume. Electrode material powder quantitative supply device. In paragraph 4, The above-mentioned transport amount control means controls the transport amount of electrode powder by removing the upper part of the electrode powder during transport. A blade that can be raised and lowered on the export belt, Including a height adjustment unit that moves the blade up and down to adjust the gap between the blades with respect to the take-out belt. Electrode material powder quantitative supply device. In paragraph 4, At the end of the above first conveyor, Equipped with a first brushing unit that shakes off the electrode powder in the powder receiving groove and drops the electrode powder onto the second conveyor. Electrode material powder quantitative supply device. In the first paragraph, The above second conveyor; It has a drive roll that rotates by receiving rotational power from a drive unit, a driven roll arranged corresponding to the drive roll, and a conveying belt that is wound around the drive roll and the driven roll and performs circular motion. On the surface of the conveyor belt, a roughened portion is formed to prevent slipping of the electrode powder. Electrode material powder quantitative supply device. In the first paragraph, The above pressing part, Comprising a pair of pressurized rolls spaced apart at a certain interval and passing and pressing electrode powder, Electrode material powder quantitative supply device. In the first paragraph, Further comprising a pressurizing unit for applying a constant pressure to the electrode powder accommodated in the above hopper. Electrode material powder quantitative supply device. In the first paragraph, The above hopper is characterized in that it is composed of an inclined plate and a vertical fixing plate having a downwardly inclined shape in the shape of a funnel, and a level sensor for sensing the height of the electrode powder filled in the hopper is arranged on the inclined plate or the vertical fixing plate inside the hopper. Electrode material powder quantitative supply device. In the first paragraph, On the opposite side of the above-mentioned export belt that does not come into contact with the hopper, an anti-sagging part composed of a number of support rolls is further provided. Electrode material powder quantitative supply device. A hopper having a narrow, inclined shape at the bottom for receiving electrode powder provided from the outside and having an outlet for discharging the electrode powder in an inclined manner; A first conveyor installed at the bottom of a hopper, having substantially the same slope as the outlet of the hopper, and receiving and transporting electrode powder discharged from the outlet of the hopper, wherein powder receiving grooves of the same height are formed at regular intervals in the front, back, left, and right directions and a circulating discharge belt is mounted; A conveyance control means for controlling the conveyance amount of electrode powder conveyed through the first conveyor; A second conveyor having a circulating conveyance belt installed thereon, which is arranged at an angle below the first conveyor and receives and conveys electrode powder that is conveyed and falls through the first conveyor; A pressing unit including a first pressing roll and a second pressing roll having a gap formed therein to pressurize the electrode powder delivered and falling from the second conveyor and form it into a film of a certain thickness, Electrode material powder quantitative supply device. In Article 12, The second pressure roll is characterized in that it rotates at a faster speed than the first pressure roll, so that the film-shaped electrode powder that has passed through the first and second pressure rolls is moved while being attached to the second pressure roll. Electrode material powder quantitative supply device.