KR102562764B1 - Apparatus and method for fabricating all solid state secondary battery - Google Patents

Abstract

The disclosed all-solid-state secondary battery manufacturing apparatus applies a first electrode material in the form of a gel formed by adding an electrolyte material to one electrode active material of a positive electrode active material and a negative electrode active material on a first release film, heats it, and laminates it on the first release film. A first electrode layer forming unit forming a solid first electrode layer, a gel-type second electrode material formed by adding an electrolyte material to the other electrode active material of the positive electrode active material and the negative electrode active material is coated on the second release film and heated. The second electrode layer forming unit for forming a solid second electrode layer laminated on the second release film, the first electrode layer laminated on the first release film and the second electrode layer laminated on the second release film face each other and are closely bonded and an electrode layer combining unit for forming a battery cell each having a first electrode layer and a second electrode layer, and a press unit for pressurizing the battery cell to reduce its thickness and increase its density.

Description

Apparatus and method for fabricating all solid state secondary battery}

The present invention relates to an all-solid-state secondary battery manufacturing apparatus and an all-solid-state secondary battery manufacturing method.

Currently, a typical commercially available secondary battery is a lithium ion secondary battery, which includes a flammable liquid electrolyte and may explode when overheated or overcharged. All-solid-state secondary batteries use solid electrolyte materials instead of liquid electrolytes, so they are safe with less risk of explosion and fire. It is advantageous.

The unit battery cell of the all-solid-state secondary battery has a three-layer structure including a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer, or a two-layer structure having a positive electrode active material layer with a solid electrolyte and a negative electrode active material layer with a solid electrolyte added. It may consist of a layered structure. However, since all-solid-state secondary batteries have not yet been commercialized and mass-produced, research and efforts to implement an all-solid-state secondary battery manufacturing apparatus suitable for mass production are also required.

Republic of Korea Patent Publication No. 10-2020-0069215

The present invention is an apparatus for manufacturing an all-solid-state secondary battery starting from a gel-type electrode material and a method for manufacturing an all-solid-state secondary battery, and an apparatus for manufacturing an all-solid-state secondary battery in which productivity is improved through the implementation of an automated process. and a manufacturing method.

In the present invention, a first electrode material in the form of a gel formed by adding an electrolyte material to one electrode active material of a positive electrode active material and a negative electrode active material is coated on a first release film, heated, and laminated on the first release film. A first electrode layer forming unit forming a solid first electrode layer, a gel-type second electrode material formed by adding an electrolyte material to the other electrode active material of the positive electrode active material and the negative electrode active material is coated on the second release film and heated to A second electrode layer forming unit forming a solid second electrode layer laminated on the second release film, the first electrode layer laminated on the first release film and the second electrode layer laminated on the second release film facing each other, Providing an all-solid-state secondary battery manufacturing apparatus comprising an electrode layer bonding unit that closely bonds to form a battery cell having a first electrode layer and a second electrode layer, and a press unit that presses the battery cell to reduce the thickness and increase the density do.

The battery cell discharged through the electrode layer bonding unit is covered with a first release film and a second release film, and the press unit may press the first release film and the second release film together with the battery cell.

The press unit includes a first release film recovery roller that winds and collects the first release film, and a first wedge that separates the battery cell from the first release film by bending the traveling direction of the first release film at an acute angle ( wedge), a second release film recovery roller that winds and collects the second release film, and a second wedge that separates the battery cell from the second release film by bending the traveling direction of the second release film at an acute angle. can do.

The first electrode layer forming unit includes a first slot die coater for applying the first electrode material to a uniform thickness on the first release film, and the second electrode layer forming unit includes the second electrode layer forming unit. It may be provided with a second slot die coater for coating the electrode material in a uniform thickness on the second release film.

The electrode layer coupling unit includes a roller coupler having a pair of rollers, and a first electrode layer laminated on the first release film and a second electrode layer laminated on the second release film are of the roller coupler. It can be tightly coupled while passing between a pair of rollers.

The electrode layer combining unit includes a first electrode layer preheater for heating the first electrode layer before the first electrode layer laminated on the first release film passes through the roller coupler, and a second electrode layer laminated on the second release film. A second electrode layer preheater for heating the second electrode layer before passing through the roller combiner may be further provided.

The press unit includes a plurality of roller presses having a pair of rollers, and the battery cells covered with the first release film and the second release film pass between the pair of rollers of each roller press. It can be pressurized step by step while passing sequentially.

The press unit may further include a battery cell heat treatment device that heats the battery cells that have passed through the plurality of roller presses to a temperature of 40 to 130°C.

The press unit includes a lower press and an upper press that press the battery cell by moving in a direction approaching each other with the battery cell interposed therebetween, and the lower press and the upper press respectively press the battery cell. A heating means for heating the surface to be pressurized in close contact to a temperature of 40 to 130°C may be provided.

A speed at which the lower press and the upper press move in a direction closer to each other may be higher than a speed before a point at which the battery cell is pressed by the lower press and the upper press than a speed thereafter.

The press unit may further include a battery cell preheater for heating the battery cells before the battery cells enter between the lower press and the upper press.

The first electrode layer forming unit includes a first near-infrared ray (NIR) heater for heating the gel-type first electrode material to a temperature of 40 to 120 ° C by irradiating near-infrared rays (NIR),

The second electrode layer forming unit may include a second near-infrared heater for heating the gel-type second electrode material to a temperature of 40 to 120° C. by irradiating near-infrared rays.

In addition, the present invention, a first electrode material in the form of a gel formed by adding an electrolyte material to one of the positive electrode active material and the negative electrode active material is coated on a first release film, heated, and laminated on the first release film. A first electrode layer forming step of forming a solid first electrode layer, a second electrode material in the form of a gel formed by adding an electrolyte material to the other electrode active material of the positive electrode active material and the negative electrode active material is coated on the second release film and heated Forming a second electrode layer of forming a solid second electrode layer laminated on the second release film, the first electrode layer laminated on the first release film and the second electrode layer laminated on the second release film facing each other An all-solid-state secondary battery manufacturing method comprising an electrode layer bonding step of forming a battery cell having a first electrode layer and a second electrode layer one by one by closely bonding the same, and a press step of pressurizing the battery cell to reduce the thickness and increase the density. to provide.

The pressing step may include a battery cell preheating step of heating the battery cell prior to pressing the battery cell.

According to the present invention, it is possible to manufacture an all-solid-state secondary battery through an automated process starting from a gel-type electrode material. Here, the all-solid-state secondary battery produced by the all-solid-state secondary battery manufacturing apparatus of the present invention is a two-layer unit battery cell secondary battery having a cathode layer containing an electrolyte material and a cathode layer containing an electrolyte material. Thus, the productivity of the all-solid-state secondary battery is improved.

1 is a block diagram of an apparatus for manufacturing an all-solid-state secondary battery of the present invention.
2 is a configuration diagram of an embodiment of the first electrode layer forming unit of FIG. 1 , and FIG. 3 is a configuration diagram of an embodiment of the second electrode layer forming unit of FIG. 1 .
4 is a configuration diagram of an embodiment of an electrode layer combiner and a press unit of FIG. 1 .
Figure 5 is a configuration diagram of another embodiment of the press unit of Figure 1;

Hereinafter, an all-solid-state secondary battery manufacturing apparatus and an all-solid-state secondary battery manufacturing method according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. Terminologies used in this specification are terms used to appropriately express preferred embodiments of the present invention, which may vary according to the intention of a user or operator or conventions in the field to which the present invention belongs. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

1 is a block diagram of an all-solid-state secondary battery manufacturing apparatus of the present invention, FIG. 2 is a configuration diagram of an embodiment of a first electrode layer forming unit of FIG. 1, and FIG. 3 is a block diagram of a second electrode layer forming unit of FIG. 1 It is a configuration diagram of an embodiment, and FIG. 4 is a configuration diagram of an embodiment of an electrode layer combiner and a press unit of FIG. 1 . 1 to 4, an all-solid-state secondary battery manufacturing apparatus 200 according to an embodiment of the present invention includes a first electrode layer 192 in a solid state that can be bent, and an image of the first electrode layer 192. An apparatus for manufacturing an all-solid-state secondary battery having a two-layer unit battery cell 197 having a bendable solid second electrode layer 196 stacked on one of the side and the lower side through an automated production process am. The first electrode layer 192 may include a positive active material and an electrolyte material and the second electrode layer 196 may include a negative active material and an electrolyte material, or vice versa.

The all-solid-state secondary battery manufacturing apparatus 200 includes a first electrode layer forming unit 201, a second electrode layer forming unit 221, an electrode layer bonding unit 240, and a press unit 250. The first electrode layer forming unit 201 forms a first electrode material 190 in the form of a gel formed by adding an electrolyte material 193 to one electrode active material 191 of a positive electrode active material and a negative electrode active material to a first release film 216 is coated on and heated to form a solid first electrode layer 192 laminated on a first release film 216, a first release film supply roller 202, a first slot die coater 203 ), a first near-infrared heater 205, a pair of rolling mills 207 and 210, and a first electrode layer recovery roller 214.

In the illustrated embodiment, the electrode active material 191 may be a positive electrode active material in a gel form. The electrolyte material 193 may be in a powder form. The powder-type electrolyte material 193 may be added and mixed with the gel-type cathode active material 191 to form the gel-type first electrode material 190 as a whole. The first release film supply roller 202 unwinds the wound first release film 216 and supplies the first release film 216 to run parallel to the Y-axis.

The first slot die coater 203 applies the first electrode material 190 to a uniform thickness on the first release film 216 supplied from the first release film supply roller 202 . The first slot die coater 203 is regularly provided for a predetermined time so that the first electrode material 190 applied in a uniform thickness on the first release film 216 is spaced apart at regular intervals to form a sheet. One can stop the leakage of the electrode material 190.

The first near-infrared heater 205 irradiates near-infrared rays (NIR) to the first electrode material 190 in gel form applied on the first release film 216 to form the first electrode material 190. Heat to a temperature of 40 to 120 ° C. Through this, the sheet-like first electrode material 190 is molded into a solid first electrode layer 192 in the shape of a gum that can be bent. The near-infrared heater 205 includes a near-infrared lamp 206 that converts electrical energy into near-infrared rays and projects them. By irradiation with near-infrared rays, the sheet-like first electrode material 190 is heated and cured earlier than the surface facing the near-infrared lamp 206 . Accordingly, molding defects in which only the surface of the first electrode layer 192 is hardened into a solid state and the inside of the first electrode layer 192 remains in a gel form are suppressed.

A pair of rolling mills 207 and 210 roll the first electrode layer 192 step by step in order to thin the thickness and increase the density of the first electrode layer 192 formed by passing through the near-infrared heater 205, They are arranged in a line along the path of the first electrode layer 192 . Each of the rolling mills 207 and 210 has upper rollers 208 and 211 and lower rollers 209 and 212 disposed above and below. The first electrode layer 192 is rolled while passing between the upper rollers 208 and 211 and the lower rollers 209 and 212 . The distance between the upper roller 208 and the lower roller 209 of the first rolling mill 207 disposed relatively upstream along the traveling direction of the first release film 216 is relatively lower than the second rolling mill disposed downstream. The first electrode layer 192 is rolled step by step as it is slightly larger than the gap between the upper roller 211 and the lower roller 212 of 210. The diameter of each of the rollers 208, 209, 211, and 212 of the rolling mills 207 and 210 may be, for example, 50 to 60 mm. However, the number of rolling mills 207 and 210 provided in the first electrode layer forming unit 201 is not limited to one pair and may be three or more or only one.

The first electrode layer recovery roller 214 winds and recovers the first electrode layer 192 passing through the pair of rolling mills 207 and 210 and the first release film 216 attaching and supporting the first electrode layer 216 in a roll form. . The first electrode layer roll (R1) wound around the first electrode layer recovery roller 214 in a roll form is disposed outside the first electrode layer 192 and the first electrode layer 192, thereby forming the first electrode layer 192. It is provided with the 1st release film 216 which adheres and supports. The guide roller 213 guides the first electrode layer 192 and the first release film 216 attaching and supporting the first electrode layer 216 toward the first electrode layer collecting roller 214 .

The second electrode layer forming unit 221 forms the second electrode material 194 in the form of a gel formed by adding the electrolyte material 193 to the other electrode active material 195 of the positive electrode active material and the negative electrode active material in a second release form. A unit for forming a solid second electrode layer 196 laminated on a second release film 236 by coating and heating the film 236, and is similar in configuration to the above-described first electrode layer forming unit 201, A second release film supply roller 222, a second slot die coater 223, a second near-infrared heater 225, a pair of rolling mills 227 and 230, and a second electrode layer recovery roller 234 are provided.

In the illustrated embodiment, the electrode active material 195 may be a negative electrode active material in a gel form. The electrolyte material 193 may be in a powder form. The powder-type electrolyte material 193 may be added and mixed with the gel-type negative active material 195 to form the gel-type second electrode material 194 as a whole. The second release film supply roller 222 unwinds the wound second release film 236 and supplies the rolled second release film 236 so as to proceed in parallel with the Y-axis.

The second slot die coater 223 applies the second electrode material 194 to a uniform thickness on the second release film 236 supplied from the second release film supply roller 222 . The second slot die coater 223 is regularly provided for a predetermined time so that the second electrode material 194 applied in a uniform thickness on the second release film 236 is spaced apart at regular intervals to form a sheet. The leakage of the two-electrode material 194 can be stopped.

The second near-infrared heater 225 radiates near-infrared rays to the gel-type second electrode material 194 applied to the second release film 236 to heat the second electrode material 194 to a temperature of 40 to 120°C. do. Through this, the sheet-shaped second electrode material 194 is molded into a solid second electrode layer 196 in the shape of a gum that can be bent. The near-infrared heater 225 includes a near-infrared lamp 226 that converts electrical energy into near-infrared rays and projects them. By irradiation with near-infrared rays, the sheet-like second electrode material 194 is heated and cured earlier than the surface facing the near-infrared lamp 226 . Accordingly, molding defects in which only the surface of the second electrode layer 196 is hardened into a solid state and the inside remains in a gel form are suppressed.

A pair of rolling mills 227 and 230 roll the second electrode layer 196 step by step in order to thin the thickness and increase the density of the second electrode layer 196 formed by passing through the near-infrared heater 225, They are arranged in a line along the path of the second electrode layer 196 . Each of the rolling mills 227 and 230 has upper rollers 228 and 231 and lower rollers 229 and 232 disposed above and below. The second electrode layer 196 is rolled while passing between the upper rollers 228 and 231 and the lower rollers 229 and 232 . The distance between the upper roller 228 and the lower roller 229 of the first rolling mill 227 disposed relatively upstream along the moving direction of the second release film 236 is relatively lower than the second rolling mill disposed downstream. The second electrode layer 196 is rolled step by step as it is slightly larger than the gap between the upper roller 231 and the lower roller 232 of 230. The diameter of each of the rollers 228, 229, 231, and 232 of the rolling mills 227 and 230 may be, for example, 50 to 60 mm. However, the number of rolling mills 227 and 230 provided in the second electrode layer forming unit 221 is not limited to one pair and may be three or more or only one.

The second electrode layer recovery roller 234 winds and recovers the second electrode layer 196 passing through the pair of rolling mills 227 and 230 and the second release film 236 attaching and supporting the second electrode layer 236 in a roll form. . The second electrode layer roll R2 wound around the second electrode layer recovery roller 234 in a roll form is disposed outside the second electrode layer 196 and the second electrode layer 196, thereby forming the second electrode layer 196. It is provided with the 2nd release film 236 which adheres and supports. The guide roller 233 guides the second electrode layer 196 and the second release film 236 attaching and supporting the second electrode layer 196 toward the second electrode layer collecting roller 234 .

The electrode layer coupling unit 240 causes the first electrode layer 192 stacked on the first release film 216 and the second electrode layer 196 stacked on the second release film 236 to face each other and closely bonded to each other to form a first electrode layer 192 stacked on the first release film 216. This is a unit for forming a battery cell 197 including the electrode layer 192 and the second electrode layer 196 one by one. The electrode layer coupling unit 240 includes a first electrode layer supply roller 238 for supplying a first release film 216 to which the first electrode layer 192 is attached and supported, and a second electrode layer 196 to which the second electrode layer 196 is attached and supported. The second electrode layer supply roller 239 for supplying the release film 236, and the first release film covering the lower and upper surfaces of the battery cell 197 to which the first electrode layer 192 and the second electrode layer 196 are combined 216) and a battery cell recovery roller 268 that recovers the second release film 236, and may be provided in a roll-to-roll facility.

The first electrode layer roll R1 (see FIG. 2) is separated from the first electrode layer recovery roller 214 (see FIG. 2), mounted on the first electrode layer supply roller 238, and the second electrode layer recovery roller ( 234) (see FIG. 3), the second electrode layer roll R2 (see FIG. 3) is separated and mounted on the second electrode layer supply roller 239, and then the first electrode layer supply roller 238 and the second electrode layer By simultaneously rotating the supply roller 239, the first release film 216 to which the first electrode layer 192 is attached and supported and the second release film 236 to which the second electrode layer 196 is attached and supported are bonded to the electrode layer. It can be fed at the same rate towards unit 240.

The electrode layer bonding unit 240 includes a roller combiner 245 , a first electrode layer preheater 241 , and a second electrode layer preheater 243 . The roller coupler 245 includes an upper roller 246 and a lower roller 247 disposed above and below. While the first electrode layer 192 stacked on the first release film 216 and the second electrode layer 196 stacked on the second release film 236 pass between the pair of rollers 246 and 247 The battery cell 197 is formed by pressing the upper surface of the first electrode layer 192 and the lower surface of the second electrode layer 196 in close contact. The battery cell 197 formed while passing between the pair of rollers 246 and 247 is covered with the first release film 216 and the second release film 236 . In other words, in the battery cell 197 moving to the battery cell recovery roller 268, the lower surface of the first electrode layer 192 is attached to the first release film 216 and the upper surface of the second electrode layer 196 is attached to the first release film 216. Since it is attached to the second release film 236 and proceeds in an unexposed state, contamination of the battery cell 197 is prevented. The first release film 216 and the second release film 236 also pass between the pair of rollers 246 and 247 and are pressed together with the first electrode layer 192 and the second electrode layer 196 .

The pair of rollers 246 and 247 may have a diameter of, for example, 50 to 60 mm. In addition, a heater for heating the surface temperature of the pair of rollers 246 and 247 to a temperature of 40 to 130 ° C. so that the first and second electrode layers 192 and 196 can be more easily combined and compressed. (not shown) may be embedded in the pair of rollers 246 and 247.

The first electrode layer preheater 241 heats the first electrode layer 192 before the first electrode layer 192 laminated on the first release film 216 passes through the roller combiner 245, and the first electrode layer 192 is heated. It is disposed between the electrode layer supply roller 238 and the roller combiner 245, and in the second electrode layer preheater 243, the first electrode layer 196 laminated on the second release film 236 passes through the roller combiner 245. By heating the second electrode layer 196 before processing, the second electrode layer is disposed between the supplying roller 239 and the roller combiner 245. The first electrode layer preheater 241 and the second electrode layer preheater 243 may each include radiant heat sources 242 and 244 that emit radiant heat. The heating temperature of the radiant heat sources 242 and 244 may be 40 to 150°C. Through the preheating of the first electrode layer preheater 241 and the second electrode layer preheater 243, bonding strength and bonding quality between the first and second electrode layers 192 and 196 may be improved.

The press unit 250 is a unit that presses the battery cell 197 that has passed through the electrode layer bonding unit 240 to reduce its thickness and increase its density, and combines the electrode layers in a roll-to-roll facility equipped with the electrode layer bonding unit 240. It may be provided downstream of unit 240. The press unit 250 includes first to fifth roller presses including upper rollers 252, 255, 258, 261, and 264 and lower rollers 253, 256, 259, 262, and 265 disposed up and down. ) (251, 254, 257, 260, 263).

The battery cells 197 covered with the first release film 216 and the second release film 236 are the upper rollers 252, 255, 251, 254, 257, 260, 263 of the first to fifth roller presses 258, 261, 264 and the lower roller (253, 256, 259, 262, 265) while sequentially passing between the pressurized step by step. As in the case of the roller combiner 245, the first release film 216 and the second release film 236 are also provided with the upper roller 252 of the first to fifth roller presses 251, 254, 257, 260, and 263. , 255, 258, 261, 264 and the lower rollers (253, 256, 259, 262, 265) and press together with the battery cell (197).

Upper rollers 252, 255, 258, 261, and 264 of the roller presses 251, 254, 257, 260, and 263 disposed relatively upstream along the moving direction of the first and second release films 216 and 236 and the lower rollers 253, 256, 259, 262, 265, the upper rollers 252, 255, 258, 261 of the roller presses 251, 254, 257, 260, 263 disposed relatively downstream 264) and the lower rollers 253, 256, 259, 262, and 265, the battery cell 197 is rolled in stages.

As in the case of the roller combiner 245, the upper rollers 252, 255, 258, 261, and 264 of the roller presses 251, 254, 257, 260, and 263 and the lower rollers 253, 256, 259, and 262, 265) may be, for example, 50 to 60 mm. In addition, the upper rollers 252, 255, 258, 261, and 264 and the lower rollers allow the battery cell 197 to be more easily compressed and deformed and the bonding force between the first electrode layer 192 and the second electrode layer 196 to be stronger. A heater (not shown) for heating the surfaces of the rollers 253, 256, 259, 262, and 265 to a temperature of 40 to 130° C. may be embedded in the pair of rollers 246 and 247.

In a preferred embodiment, the compression rate of the battery cell 197 compressed by the roller combiner 245 and the first to fifth roller presses 251, 254, 257, 260, and 263, respectively, is Among the through fifth roller presses 251 , 254 , 257 , 260 , and 263 , the compression rate of those disposed relatively upstream is greater than or equal to that of those disposed relatively downstream. For example, the battery cell 197 when the sum of the thicknesses of the first electrode layer 192 and the second electrode layer 196 before entering the roller coupler 245 has a compression rate of 0%, and the fifth roller If the thickness of the battery cell 197 passing through the press 263 is the battery cell 197 when the compression ratio is 100%, the compression ratio of the battery cell 197 by the roller coupler 245 is 40%, the first The compression ratio of the battery cell 197 by the first roller press 251 is 30%, the compression ratio of the battery cell 197 by the second roller press 254 is 10%, and the compression ratio of the battery cell 197 by the third roller press 257 The compression rate of the battery cell 197 is 10%, the compression rate of the battery cell 197 by the fourth roller press 260 is 5%, and the compression rate of the battery cell 197 by the fifth roller press 263 is may be 5%.

The battery cells 197 that have passed through the press unit 250 are wound around the battery cell recovery roller 268 in a roll form while being covered by the first release film 216 and the second release film 236 and recovered. . The battery cell roll R3 wound around the battery cell recovery roller 268 in a roll form includes a battery cell 197 having a first electrode layer 192 and a second electrode layer 196, and the battery cell 197 The first release film 216 disposed relatively inside and attaching and supporting the first electrode layer 192, and disposed relatively outside the battery cell 197 and attaching and supporting the second electrode layer 196 A second release film 236 is provided.

Meanwhile, the press unit 250 performs the first to fifth roller presses 251 , 254 , 257 , 260 , and 263 sequentially before the battery cells 197 are wound around the battery cell recovery roller 268 . A battery cell heat treatment unit 266 for heating the battery cells 197 to a temperature of 40 to 130° C. may be further provided. The battery cell heat treatment device 266 may include a radiant heat source 267 that emits radiant heat. Due to the heating through the battery cell heat treatment machine 266, the electrode cell 197 and the first release film 216 and the second release film 236 covering the electrode cell 197 are well bent even with a small force, and the battery cell recovery roller Defects in the recovery operation of the battery cell 197 by 268 are prevented, and as a result, the quality of the battery cell 197 can be improved.

Figure 5 is a configuration diagram of another embodiment of the press unit of Figure 1; 4 and 5, the press unit 270 shown in FIG. 5 separates the battery cell roll R3 from the battery cell recovery roller 268 and additionally pressurizes the battery cell 197. It may be used to separate and laminate the first and second release films 216 and 236 . Alternatively, when the roll-to-roll equipment of FIG. 4 does not have the press unit 250, the battery cell roll R3 that is not sufficiently compressed is separated from the battery cell recovery roller 268 and pressurized, and the battery cells 197 are removed. It may be used to separate and laminate the first and second release films 216 and 236 .

The press unit 270 presses the battery cell 197 to reduce its thickness and increase its density. The press unit 270 includes a battery cell supply roller 271, a first release film recovery roller 280, a first wedge 281, a second release film recovery roller 282, and a second wedge 283. , a lower press 275, an upper press 277, a battery cell preheater 272, and a battery cell tray 285 are provided. The battery cell supply roller 271 supplies the battery cells 197 whose top and bottom are covered by the first release film 216 and the second release film 236 . The battery cell roll R3 is separated from the battery cell recovery roller 268 (see FIG. 4 ), mounted on the battery cell supply roller 271, and battery cells are supplied in the direction in which the battery cell roll R3 is unwound. The battery cell 197 covered by the first release film 216 and the second release film 236 may be supplied by rotating the roller 271 .

The first release film collecting roller 280 winds and collects the first release film 216 that attaches and supports the battery cell 197 . The first wedge 281 separates the first release film 216 from the battery cell 197 by bending the traveling direction of the first release film 216 at an acute angle. The second release film collecting roller 282 winds and collects the second release film 236 that attaches and supports the battery cell 197 . The second wedge 283 separates the second release film 236 from the battery cell 197 by bending the traveling direction of the second release film 236 at an acute angle. The second wedge 283 is disposed upstream of the first wedge 281 along the traveling direction of the battery cell 197, so that the second release film 236 is placed on the battery cell 197 before the first release film 216. separated from

The lower press 275 and the upper press 277 pressurize the battery cell 197 by moving in a direction closer to each other with the battery cell 197 interposed therebetween. Specifically, the lower press 275 has a lower core 276 projecting upward, and the upper press 277 has an upper core 278 projecting downward. The upper surface 276u of the lower core 276 contacts and supports the first release film 216 to which the battery cell 197 is attached so that the first release film 216 is not pushed downward.

When the upper press 277 descends toward the lower press 275, the lower side 278b of the upper core 278 presses the second release film 236 covering the battery cell 197 in close contact with the lower side 278b. The upper surface 276u of the core 276 presses the first release film 216 in close contact. Due to this, the battery cell 197 raised between the first release film 216 and the second release film 236 is pressed. In a state where the battery cell 197 is accurately aligned with the lower core 276 and the upper core 278, the upper press 277 descends, presses the battery cell 197 closely, and raises the first release film again. 216 and the second release film 236 may intermittently progress in a direction parallel to the Y-axis. The compression force of the lower press 275 and the upper press 277 may be up to 2500 kg.

The lower press 275 and the upper press 277 heat the temperature of the upper side surface 276u of the lower core and the lower side surface 278b of the upper core, which press the battery cell 197 in close contact, to a temperature of 40 to 130 ° C, respectively. A heating means may be provided. On the other hand, depending on the components constituting the first electrode layer 192 and the second electrode layer 196, compression at a heated temperature may have a bad effect. In this case, the heating means may be stopped.

The speed at which the lower press 275 and the upper press 277 move in a direction closer to each other is the speed before the battery cell 197 starts to be pressed by the lower press 275 and the upper press 277. is faster than the rate after In other words, while being pressed by the lower press 275 and the upper press 277, the battery cell 197 is pressed at a slow speed.

The battery cell preheater 272 attaches and supports the battery cell 197 and advances the battery before the first and second release films 216 and 236 enter and pass between the lower press 275 and the upper press 277. Heat the cell 197. The battery cell preheater 272 may include a radiant heat source 273 that emits radiant heat. The heating temperature of the radiant heat source 273 may be 40 to 150°C. The quality of pressing the battery cell 197 may be improved through preheating of the battery cell preheater 272 . Meanwhile, depending on the components constituting the first electrode layer 192 and the second electrode layer 196, being compressed at a heated temperature may have a negative effect. In this case, the battery cell preheater 272 stops operating. It can be. Alternatively, a cooling unit may be further provided to operate the battery cell preheater 272 and cool the preheated battery cells 197 to room temperature by bringing the lower press 275 and the upper press 277 into close contact with each other. .

The battery passed between the lower press 275 and the upper press 277 while the traveling direction of the second release film 236 covering the upper side of the battery cell 197 is changed by the second wedge 283. from cell 197 first. The first release film 216 that continuously covers the lower side of the battery cell 197 from being exposed is separated from the battery cell 197 while the traveling direction is changed by the first wedge 281 . The battery cell 197 from which both the first release film 216 and the second release film 236 are separated may be stacked on the battery cell tray 285 . The first release film 216 and the second release film 236 separated from the battery cell 197 are wound around the first release film recovery roller 280 and the second release film recovery roller 282 as described above. is recovered

Meanwhile, in the press unit of the present invention, the battery cell 197 in a state in which it is not attached to the first and second release films 216 and 236 is attached to the upper side surface 276u of the lower core 276 of the lower press 275. ) and lower the upper press 277 toward the lower press 277 to compress the battery cell 197. In this case, the press unit includes a battery cell supply roller 271, a first release film recovery roller 280, a first wedge 281, a second release film recovery roller 282, and a second wedge 283. may not

The press unit 270 described above with reference to FIG. 5 may be provided in the roll-to-roll facility of FIG. 4 instead of the press unit 250 provided in the roll-to-roll facility of FIG. 4 . In this case, the battery cell supply roller 271 and the battery cell recovery roller 268 shown in FIG. 4 may not be provided.

On the other hand, in the method for manufacturing an all-solid-state secondary battery according to the present invention, the first electrode material 190 in the form of a gel formed by adding an electrolyte material 193 to one electrode active material 191 of a positive electrode active material and a negative electrode active material A first electrode layer forming step of forming a solid first electrode layer 192 laminated on the first release film 216 by applying and heating the first release film 216, the other one of the positive electrode active material and the negative electrode active material The second electrode material 194 in the form of a gel formed by adding the electrolyte material 193 to the electrode active material 195 is coated on the second release film 236, heated, and laminated on the second release film 236. Forming a second electrode layer 196 in a solid state, the first electrode layer 192 laminated on the first release film 216 and the second electrode layer laminated on the second release film 236 An electrode layer bonding step of forming a battery cell 197 having a first electrode layer 192 and a second electrode layer 196 one by one by making the electrodes 196 face each other and closely bonding, and the thickness of the battery cell 197 is reduced. and a press step of pressing to reduce and increase density. The pressing step may include a battery cell preheating step of heating the battery cell 197 prior to pressurization.

The first electrode layer forming step is performed by the first electrode layer forming unit 201, the second electrode layer forming step is performed by the second electrode layer forming unit 221, and the electrode layer bonding step is the electrode layer bonding step. It is performed by the unit 240, and the press step may be performed by the press units 250 and 270.

According to the all-solid-state secondary battery manufacturing apparatus 200 and the all-solid-state secondary battery manufacturing method described above, starting from the gel type electrode materials 190 and 194 through an automated process, the all-solid-state secondary battery, more specifically The battery cell 197 can be manufactured as. Thus, the productivity of the all-solid-state secondary battery is improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

190, 194: electrode material 192, 196: electrode layer
197: battery cell 200: all-solid-state secondary battery manufacturing device
201, 221: electrode layer forming unit 203, 223: slot die coater
205, 225: near-infrared heater 216, 236: release film
240: electrode layer bonding unit 250: press unit

Claims (14)

A first electrode material in the form of a gel formed by adding an electrolyte material to one of the positive electrode active material and the negative electrode active material is coated on the first release film moving in a roll-to-roll manner and heated to form the first release film. a first electrode layer forming unit for forming a stacked solid first electrode layer; The second electrode material in the form of a gel formed by adding an electrolyte material to the other electrode active material of the positive electrode active material and the negative electrode active material is coated on a second release film that is moved in a roll-to-roll manner, heated, and laminated on the second release film. a second electrode layer forming unit that forms a solid second electrode layer; A battery having one first electrode layer and one second electrode layer by moving the first electrode layer laminated on the first release film and the second electrode layer laminated on the second release film in a roll-to-roll manner so as to face each other and closely bonded to each other. an electrode layer combining unit forming a cell; and a press unit which pressurizes the battery cell to reduce the thickness and increase the density while moving the battery cell in a roll-to-roll manner.
The battery cell discharged through the electrode layer coupling unit is covered with a first release film and a second release film,
The press unit presses the first release film and the second release film together with the battery cell,
The press unit includes a plurality of roller presses having a pair of rollers sequentially from upstream to downstream near the electrode layer coupling unit, and the battery cell covered with the first release film and the second release film All-solid-state secondary battery manufacturing apparatus, characterized in that the interval between the rollers having a pair of roller presses gradually decreases from the upstream to the downstream so that the rollers are sequentially passed between the pair of rollers of each roller press and are pressed step by step. . delete According to claim 1,
The press unit includes a first release film recovery roller that winds and collects the first release film, and a first wedge that separates the battery cell from the first release film by bending the traveling direction of the first release film at an acute angle ( wedge), a second release film recovery roller that winds and collects the second release film, and a second wedge that separates the battery cell from the second release film by bending the traveling direction of the second release film at an acute angle. All-solid-state secondary battery manufacturing apparatus characterized in that to do. According to claim 1,
The first electrode layer forming unit includes a first slot die coater for applying the first electrode material to a uniform thickness on the first release film, and the second electrode layer forming unit includes the second electrode layer forming unit. All-solid-state secondary battery manufacturing apparatus characterized by comprising a second slot die coater for applying the electrode material to a uniform thickness on the second release film. According to claim 1,
The electrode layer combining unit includes a roller combiner having a pair of rollers,
All-solid-state secondary battery manufacturing apparatus, characterized in that the first electrode layer laminated on the first release film and the second electrode layer laminated on the second release film are closely coupled while passing between a pair of rollers of the roller coupler. According to claim 5,
The electrode layer combining unit includes a first electrode layer preheater for heating the first electrode layer before the first electrode layer laminated on the first release film passes through the roller coupler, and a second electrode layer laminated on the second release film. All-solid-state secondary battery manufacturing apparatus characterized in that it further comprises a second electrode layer preheater for heating the second electrode layer before passing through the roller combiner. delete According to claim 1,
The press unit further comprises a battery cell heat treatment device for heating the battery cells that have passed through the plurality of roller presses to a temperature of 40 to 130 ° C. According to claim 1,
The press unit includes a lower press and an upper press that press the battery cells by moving in a direction closer to each other with the battery cells interposed therebetween,
The lower press and the upper press each have a heating means for heating a surface on which the battery cell is pressed in close contact to a temperature of 40 to 130 ° C. All-solid-state secondary battery manufacturing apparatus. According to claim 9,
The speed at which the lower press and the upper press move in a direction closer to each other is an all-solid secondary, characterized in that the speed before the point at which the battery cell starts to be pressed by the lower press and the upper press is faster than the speed thereafter battery manufacturing device. According to claim 9,
The press unit further comprises a battery cell preheater for heating the battery cells before the battery cells enter between the lower press and the upper press. According to claim 1,
The first electrode layer forming unit includes a first near-infrared ray (NIR) heater for heating the gel-type first electrode material to a temperature of 40 to 120 ° C by irradiating near-infrared rays (NIR),
The second electrode layer forming unit comprises a second near-infrared heater for heating the second electrode material in the form of a gel to a temperature of 40 to 120 ° C. by irradiating near-infrared rays. A first electrode material in the form of a gel formed by adding an electrolyte material to one of the positive electrode active material and the negative electrode active material is coated on the first release film that is transported in a roll-to-roll manner and heated to form the first electrode material. a first electrode layer forming step of forming a stacked solid first electrode layer; The second electrode material in the form of a gel formed by adding an electrolyte material to the other electrode active material of the positive electrode active material and the negative electrode active material is coated on a second release film that is transported in a roll-to-roll manner, heated, and laminated on the second release film. a second electrode layer forming step of forming a solid second electrode layer; The first electrode layer laminated on the first release film and the second electrode layer laminated on the second release film are transported in a roll-to-roll manner so that they face each other and closely bonded to each other to form a battery cell having a first electrode layer and a second electrode layer one by one. Electrode layer bonding step to form a; And, a press step of pressurizing the battery cell transported in a roll-to-roll method to reduce the thickness and increase the density;
The pressing step is performed by pressing a plurality of roller presses having a pair of rollers sequentially while the battery cells sequentially pass from upstream to downstream, and the battery cells are compressed by the pair of rollers. The compression rate of is a method for manufacturing an all-solid-state secondary battery, characterized in that the compression rate after passing through the roller press disposed relatively upstream is equal to or greater than the compression rate after passing through the roller press disposed relatively downstream. According to claim 13,
The press step is an all-solid-state secondary battery manufacturing method characterized in that it comprises a battery cell preheating step of heating prior to pressing the battery cell.