Apparatus for sequentially coating both sides of dry electrode material for secondary battery

Abstract

The apparatus for sequentially coating both surfaces of a dry electrode material for a secondary battery of the present invention, configured as described above, can individually adjust the thickness of an electrode material coated on one side surface of a current collector and on the other side surface thereof, thereby continuously forming a dry electrode sheet having uniform density and thickness, and is minimally affected by vibrations generated by motors during operations, thereby ensuring excellent operation precision.

Description

Double-sided sequential coating device for dry electrode materials for secondary batteries

[0001] The present invention relates to an electrode material coating apparatus for a secondary battery, and more specifically, to a dry electrode material double-sided sequential coating apparatus for a secondary battery that sequentially coats electrode materials on both sides of a continuously transported current collector.

[0002] Unlike primary batteries, which are used once and then discarded, secondary batteries are rechargeable batteries that can be reused repeatedly and possess high output and excellent charge / discharge performance. Accordingly, they are being used importantly in various fields, ranging from mobile IT devices such as smartphones and laptop computers to power sources for electric vehicles and storage devices for storing electricity generated from wind or solar power.

[0003] A secondary battery has a basic composition of a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode and the negative electrode are each manufactured into a secondary battery cell through an electrode process in which an active material, a conductive material, and a binder are dispersed or dissolved in a solvent to prepare a slurry, and the slurry is coated onto a current collector and then dried, followed by an assembly process and an activation process.

[0004] However, wet electrode manufacturing methods using solvents may result in defects such as pinholes or cracks during the drying process. Pinholes or cracks occur as the contained solvent evaporates. In addition, powder flotation occurs due to differences in the solvent evaporation rate, and powder flotation is a cause of degraded electrode quality.

[0005] To solve the aforementioned problems, a dry manufacturing method for producing electrodes without using a solvent is known. The dry manufacturing method is performed by passing an electrode material powder containing an active material, a binder, and a conductive material through a plurality of calender rolls. The electrode material powder that has passed through the calender rolls is laminated and fixed to a current collector as a dry electrode film having a certain thickness.

[0006] In this regard, Korean Published Patent Application No. 10-2022-0052852 (powder for electrodes for manufacturing a dry electrode for a secondary battery, a method for manufacturing the same, a method for manufacturing a dry electrode using the same, a dry electrode, a secondary battery including the same, an energy storage device, and a dry electrode manufacturing device) has been disclosed.

[0007] The disclosed dry electrode manufacturing apparatus comprises: a blender for mixing composite raw materials including an active material, a conductive material, and a binder; a kneader for kneading the mixture to produce a mixture mass in order to fiberize the binder; a grinder for crushing the mixture mass to form a powder for electrodes; a calender for forming the powder for electrodes into a composite film; and a lamination roll for positioning the composite film on at least one surface of a current collector and laminating it.

[0008] The present invention was created to resolve the above problems and aims to provide a double-sided sequential coating device for dry electrode materials for secondary batteries, which allows for the continuous formation of dry electrode sheets with uniform density and thickness by individually adjusting the thickness of the electrode material coated on one side and the other side of the current collector, and has excellent operational precision as it is hardly affected by vibrations generated by the motor during operation.

[0009] The double-sided sequential coating apparatus for a dry electrode material for a secondary battery according to the present invention, as a means of solving the problem for achieving the above objective, comprises: a frame having a plurality of guide rolls that guide the transport of a current collector and providing a lower deck and an upper deck arranged above and below; a first rolling unit mounted on the lower deck that passes the current collector upward and rolls electrode material powder provided from the outside to a certain thickness to coat one side of the current collector; and a second rolling unit installed on the upper deck that passes the current collector that has passed the first rolling unit upward and rolls electrode material powder provided from the outside to a certain thickness to coat the other side of the current collector.

[0010] Additionally, the first and second rolling units described above include a unit housing that is vertically open and horizontally extended to allow a current collector to pass through, and is equipped with a front support wall and a rear support wall at both longitudinal ends; a plurality of linear guides fixed to the unit housing and extending in a straight line parallel from the front support wall to the rear support wall; a plurality of roll support blocks slidably installed on the linear guides; a plurality of rolling rolls that are mutually parallel and whose ends are rotatably supported on the roll support blocks; a roll drive unit that transmits rotational force to the rolling rolls; and a gap adjustment unit that adjusts the gap of the rolling rolls.

[0011] In addition, the roll drive unit includes a motor that outputs rotational force and a coupling that connects the motor and the rolling roll, and on the side of the frame, a drive unit support structure that is spaced apart from the frame and supports the motor.

[0012] In addition, the above-mentioned drive unit support structure is further provided with a linear guide that supports the motor in a sliding manner.

[0013] In addition, the above-mentioned gap adjustment unit includes: a block pusher installed between each roll support block and between the rear support wall and the roll support block, and a pusher drive unit that drives the block pusher.

[0014] In addition, the block pusher is a hydraulic actuator that operates by hydraulic pressure provided from the outside, and the pusher drive unit is equipped with a hydraulic supply unit that outputs hydraulic pressure and a control valve that is connected to each block pusher and applies the hydraulic pressure of the hydraulic supply unit to the block pusher.

[0015] In addition, a gap sensor is further installed between the roll support blocks to sense the gap between the roll support blocks and transmit the sensing information to the pusher drive unit.

[0016] In addition, each of the above rolling rolls is equipped with a roll heating unit for heating the rolling roll.

[0017] In addition, the roll heating unit comprises: a central heater installed inside the rolling roll, an end heater positioned opposite the central heater, and a heater driver that independently drives the central heater and the end heater.

[0018] In addition, the motor is a water-cooled motor, and a cooling water supply unit that circulates cooling water to the motor is further provided.

[0019] And, the above-mentioned entire unit passes between two rolling rolls adjacent to the front support wall, and the rotational speed of the rolling rolls housed in the unit housing becomes relatively faster as it moves from the rear support wall to the front support wall.

[0020] The double-sided sequential coating device for a dry electrode material for a secondary battery according to the present invention, as described above, can individually adjust the thickness of the electrode material coated on one side and the other side of the current collector, thereby enabling the continuous formation of a dry electrode sheet with uniform density and thickness, and has excellent operational precision as it is hardly affected by vibrations generated by the motor during operation.

[0021] FIG. 1 is a drawing illustrating the overall configuration of a double-sided sequential coating apparatus for a dry electrode material for a secondary battery according to one embodiment of the present invention.

[0022] Figure 2 is a diagram for explaining the principle of a sequential coating method using the coating device illustrated in Figure 1.

[0023] FIG. 3 is a side view showing the first rolling unit of FIG. 2 separately.

[0024] FIG. 4 is a side view showing the second rolling unit of FIG. 2 separately.

[0025] FIG. 5 is a diagram illustrating the sequential coating operation of a coating device according to one embodiment of the present invention.

[0026] FIG. 6 is a plan view showing a rolling roll applicable to the first and second rolling units of FIG. 2.

[0027] Figure 7 is a diagram illustrating the spreading principle of the electrode material formed through the rolling roll of Figure 6.

[0028] FIG. 8 is a diagram illustrating the principle of motor vibration suppression in a coating device according to one embodiment of the present invention.

[0029] FIG. 9 is a plan view showing the arrangement structure of the rolling unit and the rolling roll drive unit of FIG. 8.

[0030] Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the attached drawings.

[0031] FIG. 1 is a drawing illustrating the overall configuration of a double-sided sequential coating apparatus for a dry electrode material for a secondary battery according to an embodiment of the present invention, and FIG. 2 is a drawing for explaining the principle of a sequential coating method using the coating apparatus illustrated in FIG. 1. In addition, FIG. 3 is a side view separately illustrating the first rolling unit of FIG. 2, and FIG. 4 is a side view separately illustrating the second rolling unit of FIG. 2. FIG. 5 is a drawing for explaining the sequential coating operation of the coating apparatus according to an embodiment of the present invention.

[0032] As described above, the double-sided sequential coating device (10) according to the present embodiment includes a frame (15), a first rolling unit (20), and a second rolling unit (30). The frame (15) is a support structure fixed on the ground and has a plurality of guide rolls (15d). A current collector (101) provided from the unwinder unit (11) passes through the first rolling unit (20) and the second rolling unit (30) in sequence while supported by the guide rolls (15d), and then is wound onto the winder unit (13).

[0033] The current collector (101) is a material that is continuously supplied with a certain width, and receives electrode material (103) on both sides while passing upward through the first rolling unit (20) and the second rolling unit (30). In particular, electrode material is delivered to one side while passing through the first rolling unit (20), and electrode material is delivered to the other side while passing through the second rolling unit (30). Coating of electrode material (103) on both sides of the current collector (101) proceeds sequentially.

[0034] As the electrode material coating proceeds sequentially on one side and the other side, the thickness of the electrode material coated on one side and the electrode material laminated on the other side can be individually controlled. In other words, not only is it possible to control the total thickness, but individual thicknesses can also be adjusted. The result of coating the electrode material (103) on both sides of the current collector (101) is an electrode sheet (100). The electrode material (103) is formed by rolling the electrode material powder (P) supplied through the hopper (28).

[0035] In particular, the frame (15) has a lower deck (15a) and an upper deck (15b) arranged vertically. A first rolling unit (20) is installed horizontally on the lower deck (15a), and a second rolling unit (30) is mounted horizontally on the upper deck (15b). The first rolling unit (20) passes the current collector (101) upward while mounted on the lower deck (15a), and rolls the electrode material powder supplied from the hopper (28) to a certain thickness to coat one side of the current collector.

[0036] Additionally, the second rolling unit (30) is installed on the upper deck (15b) and passes the current collector that has passed through the first rolling unit (20) upward, and rolls the electrode material powder provided from the hopper (28) to a certain thickness to coat the other side of the current collector. The configuration of the first rolling unit (20) and the second rolling unit (30) is the same, except that the installation direction is opposite. That is, the first rolling unit (20) rolls the electrode material powder while moving it in the direction of arrow A, while the second rolling unit (30) rolls the electrode material powder while guiding it in the direction of arrow B.

[0037] A part of the first rolling unit (20) is illustrated in FIG. 3. As illustrated, the first rolling unit (20) includes a unit housing (21), a linear guide (21a), a roll support block (22), a rolling roll (25 in FIG. 2), a roll drive unit, and a gap adjustment unit.

[0038] The unit housing (21) is a structure fixed on the lower deck (15a) and is open vertically as shown in FIG. 8. It is also horizontally extended and has a front support wall (21d) and a rear support wall (21c) at both ends in the longitudinal direction. The roll support block (22) and the block pusher (24) are accommodated between the front support wall (21d) and the rear support wall (21c).

[0039] Additionally, the unit housing (21) is provided with a linear guide (21a). The linear guide (21a) is a straight member that supports the roll support block (22) so as to be slidably, and extends in a straight line parallel from the front support wall (21d) to the rear support wall (21c). Two linear guides (21a) are spaced apart and maintain a horizontal position. The roll support block (22) is capable of sliding movement while supported by the linear guide (21a). The roll support block (22) is a block-shaped member that is slidably installed on both linear guides (21a). The roll support blocks (22) form a pair of two and have a rolling roll (25) between them.

[0040] A rolling roll (25) can rotate by receiving rotational force from a roll drive unit while its rotational shaft is supported by a roll support block (22). A plurality of rolling rolls (25) are parallel to each other while supported by the roll support block (22). The roll drive unit transmits rotational force to each rolling roll (25). As shown in FIG. 8, the roll drive unit includes a motor (45) and a coupling (47). The motor (45) corresponds one-to-one with each rolling roll (25). The rotational force of the motor (45) is transmitted to the rolling roll (25) through the coupling (47). The motor (45) rotates the rolling rolls (25) at different speeds. This will be explained later.

[0041] The gap adjustment unit adjusts the gap of the rolling rolls (25). The gap adjustment unit includes a block pusher (24) and a pusher drive unit. The block pusher (24) is a hydraulic actuator operated by hydraulic pressure provided from the outside. The block pusher (24) is installed between adjacent roll support blocks (22). Additionally, the block pusher (24) is also installed between the rear support wall (21c) and the roll support block (22).

[0042] The block pusher (24) installed between the roll support blocks (22) widens the gap between the roll support blocks (22) under the action of hydraulic pressure. When the gap of the block pusher (24) widens, the gap of the rolling rolls (25) naturally widens as well. In addition, the block pusher (24) (hereinafter referred to as the rear block pusher) installed between the rear support wall (21c) and the roll support block (22) presses the roll support block (22) in the direction of arrow F1.

[0043] After first adjusting the spacing between the roll support blocks (22), when the rear block pusher (24) is activated, the rearmost roll support block (22) moves in the direction of arrow F1, maintaining the spacing of all roll support blocks (22).

[0044] The pusher drive unit includes a hydraulic supply unit (27) and a plurality of control valves (26). The hydraulic supply unit (27) is a hydraulic generation module including a hydraulic pump and a hydraulic fluid tank. As long as the hydraulic supply unit can generate hydraulic pressure, it can be implemented in various ways.

[0045] Additionally, the control valve (26) is a proportional control valve and is connected to each block pusher (24) and transmits hydraulic pressure to the block pusher (24). The block pusher (24) operates by the transmitted hydraulic pressure to move the roll support block (22). Each block pusher (24) can be controlled independently through the control valve (26).

[0046] In addition, a gap sensor (23) is provided between each roll support block (22). The gap sensor (23) senses the gap between adjacent roll support blocks (22) and transmits the sensing information to the pusher drive unit. The pusher drive unit can precisely control the gap of the roll support blocks (22) based on the gap data received from the gap sensor (23).

[0047] Meanwhile, the second rolling unit (30) has the configuration shown in FIG. 4. The second rolling unit (30) has the same configuration as the first rolling unit (20), only the installation direction is opposite. However, in order to make the description of the invention clearer, the second rolling unit (30) will be described.

[0048] As illustrated in FIG. 4, the second rolling unit (30) comprises a unit housing (31), a linear guide (31a), a roll support block (32), a rolling roll (35 in FIG. 2), a roll driving unit, and a gap adjustment unit.

[0049] The unit housing (31) is a structure fixed on the upper deck (15b) and is open vertically to allow the collector (101) to pass through. The unit housing (31) extends horizontally and is provided with a front support wall (31d) and a rear support wall (31c) at both ends in the longitudinal direction. The roll support block (32) and the block pusher (34) are installed sequentially between the front support wall (31d) and the rear support wall (31c).

[0050] Likewise, a linear guide (31a) is mounted on the unit housing (31). The linear guide (31a) is a straight member that supports the roll support block (32) so as to be slidably, and extends in a straight line parallel from the front support wall (31d) to the rear support wall (31c). Two linear guides (31a) are spaced apart and maintain a horizontal position. The roll support block (32) is capable of sliding movement while supported by the linear guide (31a). The roll support block (32) is a block-shaped member that is slidably installed on both linear guides (31a). The roll support blocks (32) form a pair of two and have a rolling roll (35) between them.

[0051] The rolling roll (35) can rotate by receiving rotational force from the roll drive unit while the rotational axes at both ends are supported by the roll support blocks (32). The rolling rolls (35) are mutually parallel while supported by the roll support blocks (32).

[0052] The roll drive unit transmits rotational force to each rolling roll (35). The roll drive unit includes a motor (45) and a coupling (47). The motor (45) corresponds one-to-one with each rolling roll (35). The rotational force of the motor (45) is transmitted to the rolling roll (35) through the coupling (47). The motor (45) rotates the rolling roll (35) at different speeds. This will be explained later.

[0053] The gap adjustment unit adjusts the gap of the rolling rolls (35). The gap adjustment unit includes a block pusher (24) and a pusher drive unit.

[0054] The block pusher (34) is a hydraulic actuator operated by hydraulic pressure provided from the outside. The block pusher (34) is installed between adjacent roll support blocks (32). Additionally, the block pusher (34) is also installed between the rear support wall (31c) and the roll support block (32).

[0055] The block pusher (34) installed between the roll support blocks (32) widens the gap between the roll support blocks (32) under the action of hydraulic pressure. When the gap of the block pusher (34) widens, the gap of the rolling rolls (35) naturally widens as well. In addition, the block pusher (34) (hereinafter referred to as the rear block pusher) installed between the rear support wall (31c) and the roll support block (32) presses the roll support block (22) in the direction of arrow F2.

[0056] After first adjusting the spacing between the roll support blocks (32), when the rear block pusher (34) is activated, the rearmost roll support block (32) moves in the direction of arrow F2, maintaining the spacing of all roll support blocks (32).

[0057] The pusher drive unit includes a hydraulic supply unit (27) and a plurality of control valves (26). The hydraulic supply unit (27) is a hydraulic generation module including a hydraulic pump and a hydraulic fluid tank. The control valve (36) is a proportional control type valve, is connected to each block pusher (34), and transmits hydraulic pressure to the block pusher (34). The block pusher (34) operates by the transmitted hydraulic pressure to move the roll support block (32). Each block pusher (34) can be controlled independently through the control valve (36).

[0058] In addition, a gap sensor (33) is installed between each roll support block (32). The gap sensor (33) senses the gap between adjacent roll support blocks (32) and transmits the sensing information to the pusher drive unit. The pusher drive unit can precisely control the gap of the roll support blocks (32) based on the gap data received from the gap sensor (33).

[0059] Meanwhile, as shown in FIG. 2, hoppers (28, 38) are respectively installed on the upper rear side of the first rolling unit (20) and the second rolling unit (30). The hopper (28) installed in the first rolling unit (20) is installed above two rolling rolls (25) adjacent to the rear support wall (21c) and supplies electrode material powder (P) downward. The supplied powder passes sequentially between the rolling rolls (25), enters between two rolling rolls (25) adjacent to the front support wall (21d), and is coated on one side of the current collector (101).

[0060] In order for the electrode material to move from the rear to the front, the rotational speed of the rolling roll (25) increases as it moves from the rear to the front. That is, the rolling roll (25) closest to the rear support wall (21c) rotates the slowest, and as it moves forward, it becomes faster, and the rolling roll (25) closest to the front support wall (21d) rotates the fastest. The rotational speed of the rolling roll (25) that rotates the fastest is less than twice the rotational speed of the rolling roll that rotates the slowest. That is, it rotates quickly at less than twice the speed. Because the speeds of the rolling rolls (25) differ as described above, the powder introduced through the hopper can pass between the rolling rolls and move forward to be coated on one side of the current collector (101). For reference, it is a known fact that a current collector passing through two rollers rotating at different speeds is conveyed by adhering to the outer surface of the relatively faster roller.

[0061] The hopper (38) applied to the second rolling unit (30) is installed above two rolling rolls (35) adjacent to the rear support wall (31c) and supplies electrode material powder (P) downward. The supplied powder passes sequentially between the rolling rolls (35), enters between two rolling rolls (35) adjacent to the front support wall (31d), and is coated on the other side of the current collector (101).

[0062] In order for the electrode material to move from the rear to the front, the rotational speed of the rolling roll (35) increases as it moves from the rear to the front. That is, the rolling roll (35) closest to the rear support wall (31c) rotates the slowest, and as it moves forward, it becomes faster, and the rolling roll (35) closest to the front support wall (31d) rotates the fastest. The rotational speed of the rolling roll (35) rotating the fastest is less than or equal to twice the rotational speed of the rolling roll rotating the slowest.

[0063] The rotational speed of the fastest rotating rolling rolls (25, 35) in the first rolling unit (20) and the second rolling unit (30) is the same.

[0064] FIG. 6 is a plan view showing a rolling roll applicable to the first and second rolling units of FIG. 2, and FIG. 7 is a drawing to explain the principle of spreading an electrode material formed through the rolling roll of FIG. 6.

[0065] Meanwhile, in the first and second rolling units (20, 30), a groove (25a, 35a) may be formed on the outer surface of the second rolling roll (25, 35) installed from the rear, as shown in FIG. 7.

[0066] The grooves (25a, 35a) are grooves formed on the outer surface of the rolling rolls (25, 35), having a certain width and extending in the circumferential direction. When a rolling roll with grooves (25a, 35a) is applied in this way, a plurality of grooves (103a) remain on the cross-section of the electrode material (103), as shown in FIG. 7. The grooves (103a) are filled as the electrode material (103) passes through the rolling rolls in sequence, causing the electrode material (103) to spread more uniformly. If there are no grooves (103a), the spreading ability of the electrode material (103) in the width direction is unfavorable, and the density may become uneven.

[0067] FIG. 8 is a drawing for explaining the principle of motor vibration suppression in a coating device according to an embodiment of the present invention, and FIG. 9 is a plan view showing the arrangement structure of the rolling unit and the rolling roll drive unit of FIG. 8. To avoid making the drawing too complex, the first rolling unit (20) is omitted in FIG. 8. However, the first rolling unit (20) also receives rotational force through another motor (45) and coupling (47).

[0068] As described above, a drive unit support structure (51) is installed on the side of the frame (15). The drive unit support structure (51) is spaced apart from the frame (15) and serves to support the roll drive unit. Since the drive unit support structure (51) is spaced apart from the first and second rolling units (20, 30), vibrations generated in the roll drive unit, that is, vibrations generated from the motor (45), hardly pass to the first and second rolling units (20, 30). The generated vibrations are transmitted to the ground through the drive unit support structure (51).

[0069] A linear guide (51a) is installed on the upper side of the drive unit support structure (51). The linear guide (51a) is a guide rail that supports the motor (45) so that it can slide. The linear guide (51a) is parallel to the linear guide (31a) of the second rolling unit. The motor (45) can move along the longitudinal direction of the linear guide (51a) while supported by the linear guide (51a). For example, it moves together with the rolling roll when the block pusher (24, 34) moves. The motor (45) is a water-cooled motor and is connected to the cooling water supply unit (53) through the circulation pipe (55). The cooling water supplied from the cooling water supply unit (53) circulates through the circulation pipe and cools the motor (45).

[0070] Additionally, as illustrated in FIG. 8, each rolling roll is equipped with a roll heating unit (41) for heating the rolling roll. The roll heating unit (41) includes a central heater (41a), an end heater (41b), and a heater driver (41c).

[0071] The central heater (41a) is a linear heating element installed inside the rolling roll (25, 35). The central heater (41a) intensively heats the central part of the outer surface of the rolling roll. Additionally, the end heater (41b) is a heating element located on the opposite side of the central heater (41a). The end heater (41b) intensively heats both ends of the rolling roll. By applying the central heater (41a) and the end heater (41b) separately in this way, the heating temperature of the rolling roll can be partially controlled.

[0072] Additionally, a temperature sensor (43) is placed inside the rolling roll. The temperature sensor (43) detects the heating temperature of the central heater and the end heater and transmits the detected information to the heater driver (41c). The central heater (41a) and the end heater (41b) generate heat through the power transmitted via the heater driver (41c). By heating the rolling rolls (25, 35) in this way, the rolling of the current collector can be carried out more efficiently.

[0073] Although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention.

[0074] A coating device for dry electrode materials for secondary batteries, which can individually control the thickness of the electrode material coated on one side and the other side of the entire current collector to continuously manufacture dry electrode sheets with uniform density and thickness, is industrially applicable.

Claims

1. A frame having a plurality of guide rollers that guide the transport of the entire house, and providing a lower deck and an upper deck arranged above and below; A first rolling unit mounted on a lower deck that passes the current collector upward and rolls electrode powder provided from the outside to a certain thickness to coat one side of the current collector; and A double-sided sequential coating device for a dry electrode material for a secondary battery, characterized by including a second rolling unit installed on the upper deck, which passes the current collector that has passed through the first rolling unit upward, and rolls the electrode material powder provided from the outside to a certain thickness to coat the other side of the current collector.

2. In Paragraph 1, The above first and second rolling units are, A unit housing that is vertically open and horizontally extended to allow the entire house to pass through, and is equipped with a front support wall and a rear support wall at both longitudinal ends, and A plurality of linear guides fixed to the unit housing and extending in a straight line parallel from the front support wall to the rear support wall, and A plurality of roll support blocks slidably installed on the above linear guide, and A plurality of mutually parallel rolling rolls, each end of which is rotatably supported on a roll support block, and A roll drive unit that transmits rotational force to a rolling roll, and A double-sided sequential coating device for a dry electrode material for a secondary battery, characterized by including a gap adjustment unit for adjusting the gap of the above-mentioned rolling rolls.

3. In Paragraph 2, The above-mentioned roll drive unit is, It includes a motor that outputs rotational force and a coupling that connects the motor and the rolling roll, A double-sided sequential coating device for a dry electrode material for a secondary battery, characterized by including a drive unit support structure on the side of the above-mentioned frame that is spaced apart from the frame and supports a motor.

4. In Paragraph 3, The above drive unit support structure includes, A double-sided sequential coating device for a dry electrode material for a secondary battery, characterized by further being equipped with a linear guide that supports the motor in a sliding manner.

5. In Paragraph 2, The above spacing adjustment unit is, Block pushers installed between each roll support block and between the rear support wall and the roll support block, and A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized by including a pusher drive unit that drives a block pusher.

6. In Paragraph 5, The above block pusher is, It is a hydraulic actuator operated by hydraulic pressure supplied from the outside, and The pusher drive unit is, A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized by having a hydraulic supply unit that outputs hydraulic pressure and a control valve connected to each block pusher and applying the hydraulic pressure of the hydraulic supply unit to the block pusher.

7. In Paragraph 5, Between the above roll support blocks, A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized by the additional installation of a gap sensor that senses the gap of the roll support block and transmits the sensing information to the pusher drive unit.

8. In Paragraph 2, A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized in that each of the above-mentioned rolling rolls is equipped with a rolling heating unit for heating the rolling rolls.

9. In Paragraph 8, The above-mentioned roll heating unit; A central heater installed inside the rolling roll, and End heaters positioned on the opposite side with the central heater in the center, and A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized by including a heater driver that independently drives a central heater and end heaters.

10. In Paragraph 3, The above motor is a water-cooled motor, and A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized by further being equipped with a cooling water supply unit that circulates cooling water to the motor.

11. In Paragraph 2, The above-mentioned collector passes between two rolling rolls adjacent to the front support wall, and A double-sided sequential coating device for dry electrode materials for secondary batteries, characterized in that the rotational speed of the rolling roll housed in the unit housing becomes relatively faster as it moves from the rear support wall to the front support wall.

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