Electrode lamination apparatus and method for Electrode lamination

Abstract

The electrode lamination device of the present invention comprises: a first pressing part including one or more first-1 rollers arranged to press a laminate having an electrode and a separator, a first-2 roller having a diameter different from that of the first-1 roller, and a first pressing shaft arranged to transmit a pressing force to each of the first-1 and first-2 rollers; and a first belt arranged to surround the first-1 and first-2 rollers of the first pressing part and arranged to contact the laminate.

Description

Technology Field

[0001] The present invention relates to an electrode lamination apparatus, an electrode lamination method, and a secondary battery manufactured using the same. More specifically, the invention relates to an electrode lamination apparatus and method capable of effectively heating and pressurizing to bond a laminate in which an electrode and a separator are laminated using a combination of a first roller and a second roller having different diameters and a pressure belt made of an elastic material. Background Technology

[0002] The demand for secondary batteries is increasing significantly due to the recent rapid growth of the electric vehicle and energy storage system (ESS) markets. Consequently, mass production and quality improvement of secondary batteries have emerged as critical challenges, and in particular, the quality of the lamination process—the stacking of electrodes and separators—directly affects battery performance and safety.

[0003] The lamination process of electrodes and separators is one of the core processes in secondary battery manufacturing, playing a crucial role in forming the basic structure of the battery by accurately bonding the electrodes and separators. The precision and stability of this process are particularly critical for electric vehicle batteries, which require high capacity and high power characteristics.

[0004] FIG. 1 is a schematic diagram showing the configurations of a general lamination process apparatus (10).

[0005] Referring to FIG. 1, a conventional lamination device (10) includes a heating unit (8) and lamination rollers (6, 7) provided to heat and pressurize a laminate (5) in which an anode (1), a first separator (2), a cathode (3), and a second separator (4) are sequentially stacked and moved along a transport direction (F). After the laminate (5) is heated while passing through the heating unit (8), it is pressed and bonded in a line contact manner by the upper and lower lamination rollers (6, 7).

[0006] However, these conventional lamination processes have the following problems.

[0007] First, there is a high risk of physical damage to the electrode and separator surfaces due to the line-contact compression method. In particular, if compressed at high pressure, the electrode active material may detach or the separator may tear.

[0008] Second, the line contact method makes it difficult to ensure sufficient adhesion quality between the electrode and the separator due to the very short contact area and time. Furthermore, increasing the process speed to improve productivity may further degrade the adhesion quality.

[0009] These problems are causing a decline in battery quality and productivity, posing a serious obstacle, particularly in the production of electric vehicle batteries where high quality is required.

[0010] Therefore, there is an urgent need to develop a new lamination technology that can secure uniform adhesion while minimizing surface damage to the electrode and separator. The problem to be solved

[0011] The present invention aims to solve the problems that occur in the conventional electrode lamination process for secondary batteries.

[0012] Specifically, through one embodiment of the present invention, the purpose is to provide an electrode lamination device and method capable of effectively applying pressure even in a short conveying section by utilizing a combination of a first-1 roller and a first-2 roller.

[0013] In addition, the present invention aims to provide an electrode lamination device and method capable of stable transport while transmitting uniform pressure to a laminate using a first belt and a second belt formed of an elastic material through one embodiment of the present invention.

[0014] In addition, the present invention aims to provide an electrode lamination device and method capable of providing a stable pressure to a laminate between a first pressure part and a second pressure part through one embodiment of the present invention.

[0015] Finally, the present invention aims to provide a method for manufacturing a high-quality secondary battery with improved adhesion quality between the electrode and the separator through one embodiment of the invention. means of solving the problem

[0016] To achieve the aforementioned objective, according to one embodiment of the present invention, an electrode lamination device is provided comprising: a first pressing member including one or more first-1 rollers arranged to press a laminate having an electrode and a separator, a first-2 roller having a diameter different from that of the first-1 roller, and a first pressing shaft arranged to transmit a pressing force to each of the first-1 and first-2 rollers; and a first belt arranged to surround the first-1 and first-2 rollers of the first pressing member and arranged to contact the laminate.

[0017] The first pressure member includes a pair of first-1 rollers, and a first-2 roller is positioned between the pair of first-1 rollers, and the first belt is arranged to surround the pair of first-1 rollers and the first-2 roller together, and the first pressure shaft can be connected to each of the pair of first-1 rollers and the first-2 roller.

[0018] The above 1-1 roller may have a larger diameter than the above 1-2 roller.

[0019] The first-1 roller and the first-2 roller may each be provided to be rotatable when the laminated body is driven.

[0020] The first compression shaft includes a first-1 connecting part to which the pair of first-1 rollers are connected, and a first-2 connecting part to which the first-2 rollers are connected, and may be provided with a first driving part for moving the first compression shaft in a direction toward the laminate.

[0021] The above-mentioned first-1 connecting part and the above-mentioned first-2 connecting part are connected to intersect, and the above-mentioned first driving part can be connected to the above-mentioned first-2 connecting part.

[0022] The apparatus further includes a second pressure member positioned to face the first pressure member, wherein the second pressure member may include a pair of second-1 rollers, a second-2 roller positioned between the pair of second-1 rollers, a second pressure shaft connected to each of the pair of second-1 rollers and the second-2 roller, and a second belt arranged to surround the pair of second-1 rollers and the second-2 roller together.

[0023] The first-1 roller of the first pressurizing part is positioned to face the second-1 roller of the second pressurizing part, and the first-2 roller of the first pressurizing part may be positioned to face the second-2 roller of the second pressurizing part.

[0024] The first pressurizing member may be positioned on the upper part of the laminate, and the second pressurizing member may be positioned on the lower part of the laminate.

[0025] The first belt and the second belt may be formed of an elastic material.

[0026] It may further include a control unit provided to control the pressure applied to the laminate by each of the first compression shaft and the second compression shaft.

[0027] It may further include a heating unit located upstream of the first pressurizing unit and configured to heat the laminate in which the electrode and the separator are laminated.

[0028] To achieve the aforementioned objective, according to another embodiment of the present invention, an electrode lamination method is provided comprising: a lamination step of pressing a laminate having an electrode and a separator laminated thereon by means of one or more first-1 rollers and a first-2 roller having a diameter different from that of the first-1 roller; a pressing step in which a first pressing shaft transmits a pressing force to each of the first-1 roller and the first-2 roller; and a conveying step in which the laminate is conveyed by means of a belt provided to surround the first-1 roller and the first-2 roller.

[0029] The above-mentioned pressurizing step pressurizes the laminate using a first pressurizing part provided at the top and a second pressurizing part provided at the bottom based on the laminate, wherein the first pressurizing part transmits a pressurizing force to a pair of the first-1 rollers and the first-2 rollers, and the second pressurizing part transmits a pressurizing force to a pair of the second-1 rollers and the second-2 rollers.

[0030] The first-1 roller of the first pressurizing part and the second-1 roller of the second pressurizing part are arranged to face each other, and in the pressurizing step, the first pressurizing part presses the pair of first-1 rollers and the first-2 rollers toward the laminate, and the second pressurizing part presses the pair of second-1 rollers and the second-2 rollers toward the laminate.

[0031] The above transfer step can transfer the laminate using a first belt surrounding the pair of first-1 rollers and first-2 rollers of the first pressurizing part, and a second belt surrounding the pair of second-1 rollers and second-2 rollers of the second pressurizing part.

[0032] The control unit may further include a control step for controlling the pressure applied to the laminate by each of the first pressurizing unit and the second pressurizing unit.

[0033] Prior to the lamination step, a preheating step of heating the laminate in which the electrode and the separator are laminated may be further included. Effects of the invention

[0034] An electrode lamination apparatus and method according to one embodiment of the present invention can improve upon the problems of the prior art by effectively applying pressure even in short transport sections through a combination of a first-1 roller and a first-2 roller, thereby improving the adhesion between the electrode and the separator. In particular, the first-2 roller can further improve the lamination quality by providing additional pressure in the space between the first-1 roller.

[0035] Furthermore, the electrode lamination apparatus and method of the present invention enable stable transport while transmitting uniform pressure to the laminate through a first belt and a second belt formed of an elastic material. In particular, due to the characteristic of the elastic material that deforms according to external pressure, pressure can be applied over a wider contact area, thereby enabling an efficient lamination process.

[0036] In addition, the present invention allows for uniform pressure to be applied to the upper and lower surfaces of a laminate by arranging the rollers of the first and second pressure units to face each other, and enables stable transmission of pressure through a structure in which the connecting portions of the first and second pressure shafts are connected to intersect.

[0037] In addition, the secondary battery manufactured using the electrode lamination device and method of the present invention includes an electrode assembly of uniform quality and has improved adhesion between the electrode and the separator, so durability and reliability can be significantly improved. Brief explanation of the drawing

[0038] Figure 1 is a schematic diagram showing the configurations of a typical lamination process apparatus. FIG. 2 is a configuration diagram showing the configurations of an electrode lamination device according to one embodiment of the present invention. FIG. 3 is a conceptual diagram showing the configurations of an electrode lamination device according to one embodiment of the present invention. FIG. 4 is a flowchart of an electrode lamination method according to one embodiment of the present invention. FIG. 5 is a plan view showing a secondary battery according to one embodiment of the present invention. Specific details for implementing the invention

[0039] Hereinafter, an electrode lamination device (100) and an electrode lamination method (200) according to one embodiment of the present invention will be described in detail with reference to the attached drawings.

[0040] Additionally, identical or corresponding components are assigned the same or similar reference numbers regardless of drawing symbols, and redundant descriptions thereof are omitted; furthermore, for the convenience of explanation, the size and shape of each illustrated component may be exaggerated or reduced.

[0041] FIG. 2 is a configuration diagram showing the configurations of an electrode lamination device (100) according to one embodiment of the present invention. FIG. 3 is a conceptual diagram showing the configurations of an electrode lamination device (100) according to one embodiment of the present invention.

[0042] Referring to FIGS. 2 and FIGS. 3, an electrode lamination device (100) according to one embodiment of the present invention includes a first pressurizing part (110a) and a first belt (121).

[0043] First, when defining the directions in the electrode lamination device (100) of the present invention, the transport direction of the laminate (5) can be defined as the X-axis direction, the width direction of the laminate (5) as the Y-axis direction, and the stacking direction in which the components of the laminate (5) are stacked as the Z-axis direction. Here, the laminate (5) can be formed by sequentially stacking an anode (1), a first separator (2), a cathode (3), and a second separator (4).

[0044] A first pressurizing unit (110a) is provided to heat and pressurize a laminate (5) having electrodes and a separator layer stacked thereon so that the electrodes and the separator layer of the laminate (5) are joined (thermally fused) to each other. To this end, the first pressurizing unit (110a) includes one or more first-1 rollers (111a) provided to pressurize the laminate (5) having electrodes and a separator layer stacked thereon, and a first-2 roller (112a) having a different diameter from the first-1 roller (111a).

[0045] Specifically, a first compression shaft (114) is connected to each of the first-1 roller (111a) and the first-2 roller (112a) to transmit a pressing force. Here, the first-1 roller (111a) may have a diameter that is relatively 2 to 4 times larger than that of the first-2 roller (112a). That is, the first-1 roller (111a) has a larger diameter than the first-2 roller (112a). Each of the first-1 roller (111a) and the first-2 roller (112a) may be configured to maintain a temperature at which the anode (1) of the laminate (5) and the first separator (2), or the first separator (2) and the cathode (3), or the cathode (3) and the second separator (4) can be heat-fused. To this end, each of the first-1 roller (111a) and the first-2 roller (112a) may have a heater (not shown) and a temperature sensor (not shown) built in.

[0046] The present invention may further include a first drive unit (160a) to which a pneumatic cylinder, a hydraulic cylinder, or a servo motor is applied for the movement of the first compression shaft (114) in the vertical direction (Z-axis direction). By the force generated from this first drive unit (160a), the first compression shaft (114) can transmit a pressure in the range of 0.5 MPa to 2 MPa to the laminate (5).

[0047] The first belt (121) is provided to surround the first-1 roller (111a) and the first-2 roller (112a) of the first pressure unit (110a) and is arranged to come into contact with the laminate (5). The first belt (121) stably conveys the laminate (5) while ensuring that uniform pressure is transmitted to the laminate (5) during the lamination process.

[0048] The first pressure unit (110a) comprises a pair of first-1 rollers (111a), and a first-2 roller (112a) is positioned between the pair of first-1 rollers (111a), and the first belt (121) is arranged to surround the pair of first-1 rollers (111a) and the first-2 roller (112a) together. This arrangement structure enables uniform pressure to be transmitted to the laminate (5) through the first belt (121). Additionally, the first pressure unit (110a) is provided above the laminate (5). The first-2 roller (112a) is positioned between adjacent first-1 rollers (111a) to apply additional pressure and heat to the laminate (5).

[0049] The present invention may further include a second pressure member (110b) positioned to face the first pressure member (110a). The second pressure member (110b) is provided at the bottom relative to the laminate (5). Specifically, the second pressure member (110b) may include a pair of second-1 rollers (111b) and second-2 rollers (112b). For example, the second-2 roller (112b) may be positioned between the pair of second-1 rollers (111b), and the second belt (122) may be arranged to surround the pair of second-1 rollers (111b) and the second-2 roller (112b) together. The second-2 roller (112b) may be positioned between adjacent second-1 rollers (111b) to apply additional pressure and heat to the laminate (5).

[0050] The first-1 roller (111a) and the first-2 roller (112a) are each provided to be rotatable when the laminate (5) is driven. Likewise, the second-1 roller (111b) and the second-2 roller (112b) may also each be provided to be rotatable when the laminate (5) is driven.

[0051] The first-2 roller (112a) is provided between the pair of first-1 rollers (111a). That is, the first-2 roller (112a) can improve the lamination quality by providing additional pressure in the space between the first-1 rollers (111a). The second-2 roller (112b) is provided between the pair of second-1 rollers (111b). That is, the second-2 roller (112b) can improve the lamination quality by providing additional pressure in the space between the second-1 rollers (111b).

[0052] Accordingly, the present invention can effectively apply heat and pressure to the laminate (5) over a short transport section through a pair of upper rollers (111) and lower rollers (112) by means of this configuration, thereby improving the adhesion between the electrode and the separator.

[0053] The pair of first-1 rollers (111a) and the pair of second-1 rollers (111b) are arranged to face each other. Additionally, the first-2 roller (112a) of the first pressing part (110a) is arranged to face the second-2 roller (112b) of the second pressing part (110b). The first pressing part (110a) is arranged to press the pair of first-1 rollers (111a) toward the laminate (5), and the second pressing part (110b) is arranged to press the pair of second-1 rollers (111b) toward the laminate (5).

[0054] More specifically, the first pressure shaft (114) of the first pressure member (110a) includes a first-1 connecting part (114a) to which the pair of first-1 rollers (111a) are connected, and a first-2 connecting part (114b) to which the first-2 rollers (112a) are connected. The second pressure shaft (115) of the second pressure member (110b) includes a second-1 connecting part (115a) to which the pair of second-1 rollers (111b) are connected, and a second-2 connecting part (115b) to which the second-2 rollers (112b) are connected. For example, a bearing (not shown) supporting the rotation of the rollers may be provided at the end of each connecting part.

[0055] The first-1 connecting part (114a) and the first-2 connecting part (114b) of the first compression shaft (114) are connected to intersect, and the first driving part (160a) is connected to the first-2 connecting part (114b) of the first compression shaft (114). Likewise, the second-1 connecting part (115a) and the second-2 connecting part (115b) of the second compression shaft (115) of the second compression part (110b) are connected to intersect, and the second driving part (160b) is connected to the second-2 connecting part (115b) of the second compression shaft.

[0056] For example, each of the first compression shaft (114) and the second compression shaft (115) may include a ball screw structure linked to the servo motor of each of the first drive unit (160a) and the second drive unit (160b).

[0057] Accordingly, the present invention enables a stable lamination process by allowing the first compression shaft (114) to effectively transmit pressure to the first-1 roller (111a) and the first-2 roller (112a) and the second compression shaft (115) to effectively transmit pressure to the second-1 roller (111b) and the second-2 roller (112b) through this configuration.

[0058] Additionally, the electrode lamination device (100) further includes a first driving unit (160a) for moving the first pressure shaft (114) in a direction toward the laminate (5), and a second driving unit (160b) for moving the second pressure shaft (115) of the second pressure unit (110b) in a direction toward the laminate (5). The vertical position (Z-axis direction) of each of the first driving unit (160a) and the second driving unit (160b) can be adjusted by a control unit (150) for the first pressure shaft (114) and the second pressure shaft (115), respectively.

[0059] The first belt (121) and the second belt (122) are respectively provided to surround the pair of first-1 rollers (111a) and first-2 rollers (112a) and the pair of second-1 rollers (111b) and second-2 rollers (112b). Specifically, the first belt (121) and the second belt (122) are formed of an elastic material so as to be able to transmit uniform pressure to the laminate (5). In addition, the present invention enables efficient pressure transmission by allowing the laminate (5) to be pressed over a wider contact area through the first belt (121) which contains an elastic material that deforms according to external pressure. For example, the elastic material may be synthetic rubber, and more specifically, may be a silicone rubber material.

[0060] The first belt (121) and the second belt (122) may be configured such that the positions of the first-1 roller (111a), the first-2 roller (112a), the second-1 roller (111b), and the second-2 roller (112b) are adjustable to maintain uniform tension in the width direction.

[0061] The electrode lamination device (100) further includes a control unit (150) configured to control the pressure applied to the laminate (5) by each of the first compression shaft (114) and the second compression shaft (115). The control unit (150) can maintain optimal lamination conditions by monitoring the pressure in real time.

[0062] Meanwhile, the control unit (150) may be configured to include a processing unit such as a microchip. Specifically, the control unit (150) may be implemented as a microcontroller unit (MCU) including a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), etc. Such an MCU can efficiently process complex control algorithms by employing a high-performance 32-bit or 64-bit architecture.

[0063] The electrode lamination device (100) further includes a heating unit (140) located upstream of the first pressurizing unit (110a) and configured to heat a laminate (5) in which the electrode and the separator are laminated. The heating unit (140) can improve lamination efficiency by preheating the laminate (5).

[0064] For example, the heating unit (140) may use a near-infrared lamp as a light source. For example, in the preheating step, the surface temperature of the laminate (5) may be preheated to 60 to 80 degrees Celsius. This is to minimize thermal shock in the lamination process and to form a uniform heat distribution.

[0065] Accordingly, the present invention can precisely control the pressure and temperature applied to the laminate (5) through this configuration, thereby improving the adhesion quality between the electrode and the separator.

[0066] FIG. 4 is a flowchart of an electrode lamination method (200) according to one embodiment of the present invention.

[0067] Referring to FIG. 4, an electrode lamination method (200) according to one embodiment of the present invention includes a lamination step (M01), a pressurizing step (M02), and a transfer step (M03).

[0068] The lamination step (M01) is a step of pressing a laminate (5) in which electrodes and separators are laminated by one or more first-1 rollers (111a) and first-2 rollers (112a) having a diameter different from that of the first-1 rollers (111a). In the lamination step (M01), the transfer speed of the laminate (5) can be maintained to ensure sufficient time for the electrodes and separators to be bonded.

[0069] The pressurization step (M02) is a step in which the first pressurization shaft (114) transmits pressurization force and heat to each of the first-1 roller (111a) and the first-2 roller (112a). At this time, in the pressurization step (M02), the first pressurization part (110a) and the second pressurization part (110b) can press toward the laminate (5) with synchronized movement.

[0070] Specifically, the pressurizing step (M02) pressurizes the laminate (5) using a first pressurizing part (110a) provided on the upper side and a second pressurizing part (110b) provided on the lower side based on the laminate (5). At this time, the first pressurizing part (110a) transmits a downward pressurizing force to a pair of first-1 rollers (111a) and first-2 rollers (112a), and the second pressurizing part (110b) transmits an upward pressurizing force to a pair of second-1 rollers (111b) and second-2 rollers (112b).

[0071] The first-1 roller (111a) of the first pressing part (110a) and the second-1 roller (111b) of the second pressing part (110b) are arranged to face each other. In the pressing step (M02), the first pressing part (110a) presses the pair of first-1 rollers (111a) and the first-2 roller (112a) toward the laminate (5), and the second pressing part (110b) presses the pair of second-1 rollers (111b) and the second-2 roller (112b) toward the laminate (5).

[0072] The transfer step (M03) is a step of transferring the laminate (5) by means of a first belt (121) provided to surround the first-1 roller (111a) and the first-2 roller (112a). Specifically, the transfer step (M03) transfers the laminate (5) using a first belt (121) surrounding the pair of first-1 rollers (111a) and first-2 rollers (112a) of the first pressurizing unit (110a), and a second belt (122) surrounding the pair of second-1 rollers (111b) and second-2 rollers (112b) of the second pressurizing unit (110b).

[0073] The first belt (121) and the second belt (122) are formed of an elastic material, allowing for stable transport while transmitting uniform pressure to the laminate (5).

[0074] The electrode lamination method (200) of the present invention may further include a control step in which the control unit (150) controls the pressure applied to the laminate (5) by each of the first pressurizing unit (110a) and the second pressurizing unit (110b).

[0075] Additionally, the electrode lamination method (200) of the present invention may further include a preheating step of heating the laminate (5) in which the electrode and the separator are laminated, prior to the lamination step (M01).

[0076] The above-mentioned pressurizing step (M02) is characterized in that the first driving unit (160a) moves the first pressurizing shaft (114), which is connected to the first-1 roller (111a) and the first-2 roller (112a) of the first pressurizing unit (110a), in a direction closer to the laminate (5), and the second driving unit (160b) moves the second pressurizing shaft (115), which is connected to the second-1 roller (111b) and the second-2 roller (112b) of the second pressurizing unit (110b), in a direction closer to the laminate (5).

[0077] Therefore, the present invention can apply uniform pressure to the laminate through a belt surrounding the roller by means of this configuration, thereby improving the adhesion quality between the electrode and the separator.

[0078] The control unit (150) may further include a control step for adjusting the pressure by detecting a change in the thickness of the laminate (5) in real time. To this end, the present invention may include a thickness measuring sensor (not shown) for measuring the thickness of the laminate (5).

[0079] FIG. 5 is a plan view showing a secondary battery (300) according to one embodiment of the present invention.

[0080] Referring to FIG. 5, the present invention provides a secondary battery (300) comprising an electrode assembly (320) manufactured by an electrode lamination device (100) for a secondary battery and a method (200) for an electrode lamination device for a secondary battery. By including an electrode assembly (320) manufactured by stacking a laminate (5) manufactured by the electrode lamination device (100) for a secondary battery and the method (200) for an electrode lamination device for a secondary battery according to the present invention, the secondary battery (300) can provide a high-quality secondary battery with improved durability and reliability.

[0081] Specifically, the secondary battery (300) includes an electrode assembly (320), an electrolyte (not shown), and a pouch (360). As shown in FIG. 5, a positive lead (331) protrudes outward from the top of the pouch (360), and a negative lead (333) protrudes outward from the bottom. The lead portion (330) can electrically connect the electrode assembly (320) and an external circuit.

[0082] The pouch (360) is provided to accommodate the electrode assembly (320). The pouch (360) can protect the electrode assembly (320) from the external environment and serve to maintain the electrolyte stably.

[0083] A protective film (340) is provided between the pouch (360) and the lead portion (330). The protective film (340) can ensure electrical insulation between the lead portion (330) and the pouch (360). A receiving portion (362) for accommodating an electrode assembly (320) is formed in the pouch (360).

[0084] The preferred embodiments of the present invention described above are disclosed for illustrative purposes only, and those skilled in the art with ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims. Explanation of the symbols

[0085] 1: Positive electrode 2: First separator 3: Cathode 4: Second separator 5: Laminate 6, 7: Lamination rollers (upper and lower) 8: Heating part 10: Lamination device 100: Electrode lamination device 110a: First pressurizing part 110b: Second pressurizing part 111, 111a, 111b: Upper roller, 1-1 roller, 2-1 roller 112, 112a, 112b: : Lower roller, 1st-2nd roller, 2nd-2nd roller 114: 1st compression shaft 114a: 1-1 Connection 114b: 1st-2nd connection 115: Second compression shaft 115a: 2-1 Connection 115b: 2-2 Connection 121: 1st Belt 122: 2nd Belt 140: Heating part 150: Control unit 160a: First driving unit 160b: Second drive unit

Claims

Claim 1 An electrode lamination device characterized by comprising: a first pressing part including one or more first-1 rollers arranged to press a laminate having an electrode and a separator, a first-2 roller having a diameter different from that of the first-1 roller, and a first pressing shaft arranged to transmit a pressing force to each of the first-1 and first-2 rollers; and a first belt arranged to surround the first-1 and first-2 rollers of the first pressing part and arranged to contact the laminate. Claim 2 In claim 1, the first pressing part comprises a pair of first-1 rollers, the first-2 roller is disposed between the pair of first-1 rollers, the first belt is arranged to surround the pair of first-1 rollers and the first-2 roller together, and the first pressing shaft is connected to each of the pair of first-1 rollers and the first-2 roller, forming an electrode lamination device. Claim 3 In claim 1, the electrode lamination device wherein the 1-1 roller has a larger diameter than the 1-2 roller. Claim 4 In paragraph 2, the first-1 roller and the first-2 roller are each an electrode lamination device rotatably provided during the operation of the laminate. Claim 5 In paragraph 2, the electrode lamination device comprises a first compression shaft including a first-1 connecting part to which a pair of first-1 rollers are connected, and a first-2 connecting part to which the first-2 rollers are connected, and a first driving part for moving the first compression shaft in a direction toward the laminate. Claim 6 In claim 5, the first-1 connecting part and the first-2 connecting part are connected to intersect, and the first driving part is an electrode lamination device connected to the first-2 connecting part. Claim 7 An electrode lamination device according to claim 2, further comprising a second pressure member positioned to face the first pressure member, wherein the second pressure member comprises a pair of second-1 rollers, a second-2 roller positioned between the pair of second-1 rollers, a second pressure shaft connected to each of the pair of second-1 rollers and the second-2 roller, and a second belt arranged to surround the pair of second-1 rollers and the second-2 roller together. Claim 8 An electrode lamination device according to claim 7, wherein the first-1 roller of the first pressurizing part is arranged to face the second-1 roller of the second pressurizing part, and the first-2 roller of the first pressurizing part is arranged to face the second-2 roller of the second pressurizing part. Claim 9 In claim 7, the electrode lamination device wherein the first pressurizing part is disposed on the upper part of the laminate and the second pressurizing part is disposed on the lower part of the laminate. Claim 10 In claim 7, the first belt and the second belt are electrode lamination devices formed of an elastic material. Claim 11 An electrode lamination device according to claim 7, further comprising a control unit provided to control the pressure applied to the laminate by each of the first compression shaft and the second compression shaft. Claim 12 An electrode lamination device according to claim 1, further comprising a heating unit located upstream of the first pressurizing unit and configured to heat the laminate in which the electrode and the separator are laminated. Claim 13 A lamination step of pressing a laminate in which an electrode and a separator are laminated by one or more first-1 rollers and a first-2 roller having a diameter different from that of the first-1 roller; a pressing step in which a first pressing shaft transmits a pressing force to each of the first-1 roller and the first-2 roller; and a conveying step in which the laminate is conveyed by a belt provided to surround the first-1 roller and the first-2 roller; characterized by comprising: an electrode lamination method. Claim 14 In claim 13, the above-mentioned pressing step presses the laminate using a first pressing part provided at the top and a second pressing part provided at the bottom based on the laminate, wherein the first pressing part transmits a pressing force to a pair of the first-1 rollers and the first-2 rollers, and the second pressing part transmits a pressing force to a pair of the second-1 rollers and the second-2 rollers. Claim 15 An electrode lamination method according to claim 14, wherein the first-1 roller of the first pressurizing part and the second-1 roller of the second pressurizing part are arranged to face each other, and in the pressurizing step, the first pressurizing part presses the pair of first-1 rollers and the first-2 rollers toward the laminate, and the second pressurizing part presses the pair of second-1 rollers and the second-2 rollers toward the laminate. Claim 16 In claim 14, the above transfer step is characterized by transferring the laminate using a first belt surrounding the pair of first-1 rollers and the first-2 rollers of the first pressurizing part, and a second belt surrounding the pair of second-1 rollers and the second-2 rollers of the second pressurizing part. Claim 17 An electrode lamination method according to claim 14, further comprising a control step in which a control unit controls the pressure applied to the laminate by each of the first pressurizing unit and the second pressurizing unit. Claim 18 An electrode lamination method according to claim 13, further comprising a preheating step of heating the laminate in which the electrode and the separator are laminated before the lamination step.

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