Single-unit manufacturing equipment with gloss meter and manufacturing method using the equipment

Abstract

This invention relates to a single-unit manufacturing apparatus having a gloss meter and a manufacturing method using the apparatus, and more particularly to a single-unit manufacturing apparatus comprising: a first diaphragm supply unit configured to supply a first diaphragm; a negative electrode supply unit configured to position a negative electrode at the upper surface of the first diaphragm; a second diaphragm supply unit configured to supply a second diaphragm, the second diaphragm being configured to cover the upper surface of the negative electrode; a positive electrode supply unit configured to position a positive electrode at the upper surface of the second diaphragm; a pressing unit configured to press the first diaphragm, the negative electrode, the second diaphragm, and the positive electrode; and a gloss meter positioned below the first diaphragm, and a manufacturing method using the apparatus.

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 2021-0042352, filed on March 31, 2021, and Korean Patent Application No. 2022-0009455, filed on January 21, 2022, the entire patent applications of which are incorporated herein by reference.

[0002] This invention relates to a single-unit manufacturing apparatus with a gloss meter and a manufacturing method using the apparatus, and more particularly to a single-unit manufacturing apparatus with a gloss meter and a manufacturing method using the apparatus, which are capable of immediately checking for abnormalities in a single unit, and further rapidly inspecting a single unit, thereby reducing defective products and improving production efficiency. Background Technology

[0003] With the recent development of alternative energy sources due to air pollution and energy depletion caused by fossil fuel use, the demand for rechargeable batteries capable of storing generated electrical energy has increased. Rechargeable batteries are widely used in daily life. For example, they are used in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Due to the increased use of mobile devices, their ever-increasing complexity, and the development of electric vehicles, the required capacity of secondary batteries, which serve as the energy source for various electronic devices inevitably used in modern society, has increased. To meet user needs, multiple battery cells are incorporated into small devices, while battery modules comprising multiple electrically connected battery cells or battery packs containing multiple battery modules are used in vehicles.

[0005] When secondary batteries are used in devices that require high capacity and high voltage (such as electric vehicles), they are used in the form of battery modules or battery packs, which are configured to have a structure in which multiple battery cells are arranged.

[0006] Meanwhile, when manufacturing a single unit constituting the electrode assembly, a lamination process is performed, which involves simultaneously applying pressure and heat to bring the positive electrode, negative electrode, and separator constituting the single unit into close contact with each other and to bond these components together. At this time, if the pressure and heat are too high, the separator may deform; or if the pressure and heat are insufficient, the adhesion between the components of the single unit may be low, thus potentially resulting in a defect in the single unit.

[0007] Related to this, Figure 1 This is a three-dimensional diagram of a traditional single-unit manufacturing equipment. (Refer to...) Figure 1Conventional single-unit manufacturing equipment includes a supply roller 20 configured to supply electrodes 11 and 13 and diaphragms 12 and 14 such that the electrodes 11 and 13 and diaphragms 12 and 14 are stacked alternately, a first cutter 30 for cutting electrodes 11 and 13, a laminator 40 configured to thermally fuse electrodes 11 and 13 and diaphragms 12 and 14 to manufacture a basic unit sheet, and a second cutter 50 configured to cut the basic unit sheet to a predetermined size to form a single unit 10.

[0008] After manufacturing individual unit 10, a defect determination process is performed to check whether the individual unit is abnormal. However, if the diaphragm supplied during manufacturing processes such as fusion or cutting is abnormal, it is possible that all individual units produced on the same production line will be determined to be defective, potentially leading to the discard of multiple individual units. Furthermore, the time required to obtain the determination result may reduce production efficiency.

[0009] (Existing technical documents)

[0010] (Patent Document 1) Korean Patent Application Publication No. 2019-0000589 Summary of the Invention

[0011] Technical issues

[0012] The present invention was made in view of the above problems, and one object of the present invention is to provide a single cell manufacturing apparatus with a gloss meter that can immediately check whether a cut single cell is abnormal and perform feedback, thereby reducing the number of discarded single cells, and a manufacturing method using the apparatus.

[0013] Another object of the present invention is to provide a single-cell manufacturing apparatus with a gloss meter that can quickly determine whether a single cell is defective, thereby improving the efficiency of the production process, and a manufacturing method using the apparatus.

[0014] Technical solution

[0015] To achieve the above objectives, the single-unit manufacturing apparatus with a gloss meter according to the present invention includes a first diaphragm supply unit (100) configured to supply a first diaphragm (110), a negative electrode supply unit (200) configured to position a negative electrode (210) at the upper surface of the first diaphragm (110), a second diaphragm supply unit (300) configured to supply a second diaphragm (310) (the second diaphragm (310) is configured to cover the upper surface of the negative electrode (210), a positive electrode supply unit (400) configured to position a positive electrode (410) at the upper surface of the second diaphragm (310), a pressing unit (500) configured to press the first diaphragm (110), the negative electrode (210), the second diaphragm (310), and the positive electrode (410), and a gloss meter (600) positioned below the first diaphragm (110).

[0016] Furthermore, in the single-unit manufacturing apparatus according to the present invention, the first diaphragm supply unit (100) may include a first diaphragm supply roller (120) wound with a first diaphragm (110) and a first guide roller (130) configured to guide the conveyance of the first diaphragm (110).

[0017] Furthermore, in the single-unit manufacturing apparatus according to the present invention, the negative electrode supply unit (200) may include a negative electrode supply roller (220) wound with a negative electrode (210), a first cutting unit (230) configured to cut the negative electrode (210) at predetermined intervals, and a first vision camera (240) configured to check the placement position of the negative electrode (210).

[0018] Furthermore, in the single-unit manufacturing apparatus according to the present invention, the second diaphragm supply unit (300) may include a second diaphragm supply roller (320) wound with a second diaphragm (310) and a second guide roller (330) configured to guide the conveyance of the second diaphragm (310).

[0019] Furthermore, in the single-unit manufacturing apparatus according to the present invention, the positive electrode supply unit (400) may include a positive electrode supply roller (420) wound with a positive electrode (410), a second cutting unit (430) configured to cut the positive electrode (410) at predetermined intervals, and a second vision camera (440) configured to check the placement position of the positive electrode (410).

[0020] Furthermore, in the single-unit manufacturing apparatus according to the invention, the pressing unit (500) may include a pair of pressing rollers (510) configured to press a stack of a first diaphragm (110), a negative electrode (210), a second diaphragm (310) and a positive electrode (410) stacked in the described order with a predetermined pressure, and a third cutting unit (520) configured to cut the first diaphragm (110) and the second diaphragm (310) at predetermined intervals.

[0021] Moreover, in the single-unit manufacturing apparatus according to the invention, the gloss meter (600) can be positioned behind a pair of pressing rollers (510).

[0022] Furthermore, in the single-unit manufacturing apparatus according to the present invention, the first diaphragm (110) may include SRS composed of inorganic particles.

[0023] Additionally, the single-cell manufacturing method according to the present invention includes the steps of supplying a first separator (110) and placing a negative electrode (210) on the upper surface of the first separator (110) (S1), supplying a second separator (310) to the upper surface of the negative electrode (210) and placing a positive electrode (410) on the upper surface of the second separator (310) (S2), pressing the first separator (110), the negative electrode (210), the second separator (310) and the positive electrode (410) to form a stack (S3), and cutting the stack at predetermined intervals to prepare a single cell (S4), wherein, after step S3, a step of measuring the gloss of the first separator (110) is further performed.

[0024] Furthermore, in the manufacturing method according to the present invention, a step of measuring gloss can be performed after step S4.

[0025] In addition, the manufacturing method according to the invention may further include the step (S5) of determining that a single unit is normal when the measured gloss is within a predetermined range, and determining that a single unit is defective when the measured gloss deviates from the predetermined range.

[0026] Furthermore, in the manufacturing method according to the present invention, the normal range and defective range of gloss can be set according to the adhesive force between the first diaphragm (110) and the negative electrode (210) and the permeability between the first diaphragm and the negative electrode (210).

[0027] In addition, the present invention provides a single unit manufactured by a single unit manufacturing method.

[0028] Beneficial effects

[0029] As is clear from the above description, the single-unit manufacturing apparatus with a gloss meter according to the present invention and the manufacturing method using the apparatus have the following advantages: by measuring the gloss of the inorganic particle layer of the diaphragm with a gloss meter, and determining whether the single unit is defective, the measurement can be performed very conveniently and the inspection can be performed quickly.

[0030] Furthermore, the single-unit manufacturing apparatus with a gloss meter according to the present invention and the manufacturing method using the apparatus have the following advantages: when a single unit being manufactured is defective, rapid measures can be taken, thereby reducing the number of units discarded due to manufacturing defects and thus reducing manufacturing costs. Attached Figure Description

[0031] Figure 1 This is a three-dimensional diagram of a traditional single-unit manufacturing equipment.

[0032] Figure 2 This is a perspective view of a single-unit manufacturing apparatus according to a preferred embodiment of the present invention.

[0033] Figure 3 yes Figure 2 The front view of the single-unit manufacturing equipment shown.

[0034] Figure 4 This is a flowchart illustrating a single-unit manufacturing method according to a preferred embodiment of the present invention.

[0035] Figure 5 This is a cross-sectional view of a single unit according to a preferred embodiment of the present invention.

[0036] Figure 6 This is a graph showing the measurement results of gloss on multiple samples.

[0037] Figure 7 This is a graph showing the measurement results of the adhesion force between the negative electrode and the diaphragm for each of the multiple samples.

[0038] Figure 8 This is a graph showing the measurement results of the permeability of multiple samples. Detailed Implementation

[0039] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement these preferred embodiments. However, in describing the operational principles of the preferred embodiments of the present invention, detailed descriptions of known functions and configurations incorporated herein may obscure the subject matter of the invention.

[0040] Furthermore, the same reference numerals will be used in all the accompanying drawings to indicate parts that perform similar functions or operations. Where one part is described throughout the specification as being connected to another part, this one part may be directly connected to the other part, or indirectly connected to the other part via another part. Additionally, including an element does not imply the exclusion of other elements, but rather means that, unless otherwise specified, such elements may be further included.

[0041] In the following description, a single-unit manufacturing apparatus with a gloss meter according to the present invention and a manufacturing method using the apparatus will be described with reference to the accompanying drawings.

[0042] Figure 2 This is a perspective view of a single-unit manufacturing apparatus according to a preferred embodiment of the present invention, and Figure 3 yes Figure 2 The front view of the single-unit manufacturing equipment shown.

[0043] Reference Figure 2 and Figure 3 According to a preferred embodiment of the present invention, a single-unit manufacturing apparatus includes a first diaphragm supply unit 100, a negative electrode supply unit 200, a second diaphragm supply unit 300, a positive electrode supply unit 400, a pressing unit 500, and a gloss meter 600.

[0044] When the first diaphragm supply unit 100 is described in detail, the first diaphragm supply unit includes a first diaphragm 110 configured to be supplied to a single-unit manufacturing equipment, a first diaphragm supply roller 120 wound with the first diaphragm 110, and a first guide roller 130 configured to guide the first diaphragm 110 to convey the first diaphragm 110 in a horizontal direction.

[0045] Here, an insulating film exhibiting high ion permeability and mechanical strength is used as the first diaphragm 110. The first diaphragm typically has a pore size of 0.01 μm to 10 μm and a thickness of 5 μm to 300 μm. As the first diaphragm, for example, sheets or nonwoven fabrics made of olefin-based polymers such as polypropylene, glass fibers, or polyethylene exhibiting chemical resistance and hydrophobicity are used. Furthermore, the first diaphragm can be a safety-reinforced diaphragm (SRS diaphragm).

[0046] SRS membranes are manufactured by setting inorganic particles and binder polymers as active layer components on an olefin-based membrane substrate. Therefore, SRS membranes have a uniform porous structure due to the porous structure included in the membrane substrate and the interstitial volume between the inorganic particles, which are one of the active layer components.

[0047] When using an SRS separator, it has the advantage of suppressing the increase in battery thickness due to expansion during formation, compared to using a conventional separator. The SRS separator can also be used as the electrolyte when a polymer capable of gelling upon impregnation with a liquid electrolyte solution is used as the binder polymer component.

[0048] In addition, by adjusting the content of inorganic particles and binder polymers, which are components of the active layer in the separator, the SRS separator can exhibit excellent adhesive properties, thereby facilitating battery assembly processes.

[0049] There are no particular limitations on the inorganic particles used here, as long as they are electrochemically stable. Preferably, the inorganic particles are not oxidized and / or reduced within the battery's operating voltage range (e.g., 0V to 5V based on Li / Li+). When using inorganic particles with ion-transporting capabilities, it is more preferable that the inorganic particles have the highest possible ionic conductivity, as this can improve the ionic conductivity in the electrochemical device, thereby enhancing battery performance.

[0050] The negative electrode supply unit 200 includes a negative electrode 210 configured to be disposed on the upper surface of the first diaphragm 110, a negative electrode supply roller 220 wound with the negative electrode 210, a first cutting unit 230 configured to cut the negative electrode 210 at predetermined intervals, and a first vision camera 240 configured to inspect the negative electrode 210 that has been cut and disposed on the upper surface of the first diaphragm 110.

[0051] Here, the negative electrode is manufactured by applying the negative electrode active material to the negative electrode current collector and drying the negative electrode active material. The negative electrode has a known structure, so its detailed description will be omitted.

[0052] The first cutting unit 230 cuts the negative electrode to obtain a single cell with a predetermined size, and the first vision camera 240 determines whether the cut negative electrode is accurately placed in the desired position.

[0053] As an example, the first vision camera 240 processes the image acquired through image acquisition performed by the camera to verify whether the negative electrode 210 disposed on the first diaphragm 110 is within a predetermined displacement range. The structure and operating principle of the vision camera are known, therefore a more detailed description thereof will be omitted.

[0054] The second diaphragm supply unit 300 includes a second diaphragm 310 configured to be supplied to cover the upper surface of the negative electrode 210, a second diaphragm supply roller 320 wound with the second diaphragm 310, and a second guide roller 330 configured to guide the second diaphragm 310 to convey the second diaphragm 310 in a horizontal direction.

[0055] Here, the second diaphragm 310 can be a commonly known diaphragm or an SRS diaphragm, similar to the first diaphragm 110.

[0056] The positive electrode supply unit 400 includes a positive electrode 410 configured to be disposed on the upper surface of the second diaphragm 310, a positive electrode supply roller 420 wound with the positive electrode 410, a second cutting unit 430 configured to cut the positive electrode 410 at predetermined intervals, and a second vision camera 440 configured to inspect the cut positive electrode 410 disposed on the upper surface of the second diaphragm 310.

[0057] Here, the positive electrode is manufactured by applying a mixture of positive electrode active material, conductive agent, and binder to the positive electrode current collector and then drying the mixture. Fillers are further added as needed. These are known structures, therefore detailed descriptions will be omitted.

[0058] The second cutting unit 430 cuts the coiled positive electrode to obtain a single unit with a predetermined size. Except for the different mounting positions of the second vision camera 440 and the first vision camera 240, the second vision camera 440 operates identically to the first vision camera 240. The second vision camera checks whether the positive electrode 410, positioned on the second diaphragm 310, is within a predetermined displacement range.

[0059] The pressing unit 500 provided for the lamination process includes a pair of pressing rollers 510 configured to press a stack of a first diaphragm 110, a negative electrode 210, a second diaphragm 310 and a positive electrode 410 stacked from below in an up-down direction with a predetermined pressure, and a third cutting unit 520 configured to cut the first diaphragm 110 and the second diaphragm 310 at predetermined intervals.

[0060] Here, a pair of pressing rollers 510 press the first diaphragm 110, the negative electrode 210, the second diaphragm 310, and the positive electrode 410, causing these components to adhere to each other. A heating wire configured to heat the pressing rollers to a predetermined temperature can be installed on the pressing rollers.

[0061] Simultaneously, the third cutting unit 520 cuts the stack consisting of the first separator 110, the negative electrode 210, the second separator 310, and the positive electrode 410 stacked in the described order to obtain a single unit with a predetermined size.

[0062] The gloss meter 600 is preferably positioned behind a pair of pressing rollers 510, and more preferably provided below the first diaphragm 110, while being positioned near the third cutting unit 520 behind it, to measure the gloss of a surface of the first diaphragm 110 (i.e., the underside of the first diaphragm 110).

[0063] Traditionally, there are problems with measuring the adhesion and permeability of the negative electrode, diaphragm, and positive electrode that make up a single unit to determine whether the single unit is defective. This measurement is difficult and requires a lot of measurement time.

[0064] In contrast, in this invention, the gloss of the first diaphragm 110 is measured to determine whether a single cell is defective, thereby allowing the measurement to be performed very conveniently and quickly.

[0065] In other words, the size of the inorganic particle layer of the diaphragm changes during the pressing process due to pressure and heat, which affects the diaphragm's permeability and adhesion. Consequently, measuring the gloss of the inorganic particles determines the degree of deformation of the inorganic particle layer, ultimately allowing for the examination of changes in the diaphragm's permeability and adhesion.

[0066] Of course, in order to predict the permeability and adhesion of the membrane from the gloss of inorganic particles, it is obviously necessary to obtain the relationship between the gloss of inorganic particles and the permeability and adhesion of the membrane in advance.

[0067] Figure 4 This is a flowchart illustrating a single-unit manufacturing method according to a preferred embodiment of the present invention, and Figure 5 This is a cross-sectional view of a single unit according to a preferred embodiment of the present invention.

[0068] Reference Figure 4 The single-cell manufacturing method using the above-described manufacturing equipment includes the following steps: (S1) placing a negative electrode 210 on the upper surface of the first diaphragm 110 while supplying the first diaphragm 110; (S2) placing a positive electrode 410 on the upper surface of the second diaphragm 310 while supplying the second diaphragm 310 to the upper surface of the negative electrode 210; (S3) pressing the first diaphragm 110, the negative electrode 210, the second diaphragm 310, and the positive electrode 410 to form a stack; (S4) cutting the stack at predetermined intervals to prepare a single cell; and (S5) measuring the gloss of the first diaphragm 110 and determining that the single cell is normal when the measured value is within a predetermined range and that the single cell is defective when the measured value deviates from the predetermined range.

[0069] First, the step (S1) of placing the negative electrode 210 on the upper surface of the first diaphragm 110 while supplying the first diaphragm 110 is the step of supplying the first diaphragm 110 wound with the first diaphragm supply roller 120 and simultaneously placing the negative electrode 210 cut at predetermined intervals on the upper surface of the first diaphragm 110.

[0070] Here, the first diaphragm 110 is conveyed and supplied in the horizontal direction by the first guide roller 130.

[0071] At this point, it is preferable to further perform the step of checking, via the first vision camera 240, whether the negative electrode 210 supplied to the upper surface of the first diaphragm 110 is positioned at a predetermined location.

[0072] The step (S2) of placing the positive electrode 410 on the upper surface of the second diaphragm 310 while supplying the second diaphragm 310 to the upper surface of the negative electrode 210 is to place the second diaphragm 310 wound with the second diaphragm supply roller 320 on the upper surface of the negative electrode 210 and to place the positive electrode 410 cut by the second cutting unit 430 at predetermined intervals on the upper surface of the placed second diaphragm 310.

[0073] Here, the second diaphragm 310 is conveyed and supplied in the horizontal direction by the second guide roller 330, and the positive electrode 410, cut at predetermined intervals, is placed in the same vertical position as the negative electrode 210.

[0074] At this point, it is preferable to further perform the step of checking, via the second vision camera 440, whether the positive electrode 410 supplied to the upper surface of the second diaphragm 310 is positioned at a predetermined location.

[0075] The step (S3) of pressing the first diaphragm 110, negative electrode 210, second diaphragm 310 and positive electrode 410 to form a stack is to use a pressing roller 510 to press the stack consisting of the first diaphragm 110, negative electrode 210, second diaphragm 310 and positive electrode 410 stacked from below in the described order so that these components are in close contact with each other and are bonded together.

[0076] At this point, it is preferable to heat the stack to a predetermined temperature to increase the adhesion of the stack.

[0077] The step (S4) of cutting the stack at predetermined intervals to prepare a single unit is to use the third cutting unit 520 to cut the first diaphragm 110 and the second diaphragm 310 of the stack obtained in step S3 to obtain a single unit.

[0078] Finally, step S5 is to determine whether the individual unit obtained in step S4 is defective. Specifically, the gloss of the first diaphragm 110 is measured. When the measured value is within a predetermined range, i.e., within a reference value based on a predetermined relationship between gloss, permeability, and adhesion, the individual unit is determined to be normal. When the measured value deviates from the predetermined range, the individual unit is determined to be defective.

[0079] When the measured gloss is within the predetermined range, the single unit is determined to be normal, and the manufacturing process of the single unit continues. If a defect is determined in a single unit, the manufacturing process is interrupted, and measures such as root cause analysis are taken.

[0080] Meanwhile, a single unit is not necessarily measured after being cut by the third cutting unit 520. For example, after measuring gloss, the stack can only be cut to form a single unit if the measured value is within the normal range; however, considering the possibility of the stack being pressed during the cutting process, it is more preferable to measure the gloss after the cutting process.

[0081] Figure 5 This is a cross-sectional view of a single cell according to a preferred embodiment of the present invention. In the single cell obtained by the above method, the first separator 110, the negative electrode 210, the second separator 310 and the positive electrode 410 are stacked in the order described, and multiple single cells can be stacked to form a battery cell.

[0082] The invention will be described below with reference to the following examples. These examples are provided merely to facilitate understanding of the invention and should not be construed as limiting the scope of the invention.

[0083] Example

[0084] use Figure 3 The device shown is manufactured as a single unit consisting of a first diaphragm, a negative electrode, a second diaphragm, and a positive electrode stacked from below in the described order.

[0085] Here, the positive electrode is prepared by coating the opposing surfaces of a thin aluminum foil with a positive electrode mixture comprising a nickel-manganese-cobalt based positive electrode active material, a binder, and a conductive agent, and then drying the positive electrode mixture. The separator is prepared by coating the opposing surfaces of a membrane substrate with a porous structure made of polypropylene with a coating slurry comprising Al2O3 inorganic particles and a PVDF binder, and then drying the coating slurry.

[0086] Alternatively, a negative electrode is prepared by coating the opposing surfaces of a thin copper foil with a negative electrode mixture comprising a graphite-based negative electrode active material, a binder, and a conductive agent, and then drying the negative electrode mixture.

[0087] Simultaneously, in the lamination process of a single unit consisting of a first separator, a negative electrode, a second separator, and a positive electrode stacked in the described order, pressing is performed using a pair of pressing rollers in the range of 300 kgf to 350 kgf. Subsequently, cutting is performed at predetermined intervals to prepare multiple single units.

[0088] <Experimental Example>

[0089] Gloss measurement

[0090] With the first diaphragm and the negative electrode in close contact with each other, the second diaphragm and the positive electrode are peeled off from each prepared single unit to prepare a sample for measurement, and the gloss of the first diaphragm is measured.

[0091] Measure a total of three points on the same sample, such as the middle and opposite edges of the sample. Use a BYK gloss meter (model AG-4563) as the gloss meter, and perform the measurement at 60° for standard gloss.

[0092] Permeability measurement

[0093] Permeability was measured on the same sample used to measure gloss. Here, the permeability measurement object is the first membrane in a state where the negative electrode has been separated from the first membrane. In order to remove Al2O3 inorganic particles and PVDF binder, washing and drying with acetone were performed, and the measurement was performed using a permeability measuring instrument (EG01-55-1MR from Asahi Seiko Co., Ltd.)

[0094] Measurement of adhesive force

[0095] The adhesion between the negative electrode and the separator was measured on the same sample used to measure gloss, according to ASTM D3330. Specifically, double-sided adhesive tape was attached to a glass slide, and the negative electrode surface of the prepared sample was attached to the tape. Subsequently, the force required to separate the negative electrode and the separator from each other was measured using a universal testing machine (UTM) at a speed of 100 mm / min via a 90° peel method.

[0096] Figure 6 This is a graph showing the measurement results of glossiness for multiple samples. Figure 7 This is a graph showing the measurement results of the adhesion between the negative electrode and the membrane for multiple samples, and Figure 8 This is a graph showing the measurement results of the permeability of multiple samples.

[0097] First, the gloss measurement results show that the minimum average value of gloss ranges from 5.9 GU to 8.5 GU for groups 1 to 4, and the average value of gloss for group 5 is 4.2 GU.

[0098] Meanwhile, the measurement results of the adhesion between the negative electrode and the separator showed that the average adhesion between the first to fourth groups was 13.9 gf / 20 mm to 33.0 gf / 20 mm, while the fifth group had an average adhesion of 4.1 gf / 20 mm.

[0099] In addition, the permeability measurement results (the time required for 100cc of gas to pass through a sample with a diameter of 5cm) showed that Group 5 had an average permeability of 68.7s / 100cc, which was much lower than the average permeability of Groups 1 to 4, which was 73.8 to 78.6s / 100cc.

[0100] Considering that the required adhesion and penetration under the example conditions are above 10gf / 20mm and above 70s / 100cc respectively, the sample corresponding to Group 5 is a defective product.

[0101] Even if only the gloss of the membrane of a single manufactured unit is measured without measuring the adhesion between the negative electrode and the membrane or the permeability of the membrane, as described above, it is possible to determine whether the sample has defects.

[0102] Of course, the required adhesion or permeability may vary depending on changes in the physical properties of the negative electrode, diaphragm, and positive electrode. However, with the relationship between gloss, permeability, and adhesion prepared in advance, it is possible to determine whether a single cell is normal or defective simply by measuring gloss.

[0103] Those skilled in the art will understand that, based on the above description, various applications and modifications are possible within the scope of this invention.

[0104] (Refer to the labeling explanation)

[0105] 100: First diaphragm supply unit

[0106] 110: First diaphragm

[0107] 120: First diaphragm supply roller

[0108] 130: First guide roller

[0109] 200: Negative electrode supply unit

[0110] 210: Negative electrode

[0111] 220: Negative electrode supply roller

[0112] 230: First Cutting Unit

[0113] 240: First-person view camera

[0114] 300: Second diaphragm supply unit

[0115] 310: Second diaphragm

[0116] 320: Second diaphragm supply roller

[0117] 330: Second guide roller

[0118] 400: Positive electrode supply unit

[0119] 410: Positive electrode

[0120] 420: Positive electrode supply roller

[0121] 430: Second cutting unit

[0122] 440: Second Vision Camera

[0123] 500: Pressing unit

[0124] 510: Pressing roller

[0125] 520: Third Cutting Unit

[0126] 600: Gloss meter

Claims

1. A single-unit manufacturing device, comprising: A first diaphragm supply unit, configured to supply a first diaphragm; A negative electrode supply unit, the negative electrode supply unit being configured to position a negative electrode on the upper surface of the first diaphragm; A second diaphragm supply unit is configured to supply a second diaphragm, the second diaphragm being configured to cover the upper surface of the negative electrode; A positive electrode supply unit, the positive electrode supply unit being configured to position a positive electrode on the upper surface of the second diaphragm; The pressing unit is configured to press the first diaphragm, the negative electrode, the second diaphragm, and the positive electrode; and A gloss meter, which is positioned below the first diaphragm.

2. The single-unit manufacturing apparatus according to claim 1, wherein the first diaphragm supply unit comprises: A first diaphragm supply roller, on which the first diaphragm is wound; and A first guide roller is configured to guide the conveyance of the first diaphragm.

3. The single-unit manufacturing apparatus according to claim 1, wherein the negative electrode supply unit comprises: A negative electrode supply roller, on which the negative electrode is wound; A first cutting unit, configured to cut the negative electrode at predetermined intervals; and A first vision camera is configured to inspect the placement location of the negative electrode.

4. The single-unit manufacturing apparatus of claim 1, wherein the second diaphragm supply unit comprises: A second diaphragm supply roller, on which the second diaphragm is wound; and The second guide roller is configured to guide the conveyance of the second diaphragm.

5. The single-unit manufacturing apparatus according to claim 1, wherein the positive electrode supply unit comprises: A positive electrode supply roller, on which the positive electrode is wound; A second cutting unit, configured to cut the positive electrode at predetermined intervals; and A second vision camera is configured to inspect the placement position of the positive electrode.

6. The single-unit manufacturing apparatus according to claim 1, wherein the pressing unit comprises: A pair of pressing rollers configured to press a stack consisting of the first diaphragm, the negative electrode, the second diaphragm, and the positive electrode stacked sequentially, at a predetermined pressure; and A third cutting unit is configured to cut the first diaphragm and the second diaphragm at predetermined intervals.

7. The single-unit manufacturing apparatus of claim 6, wherein the gloss meter is positioned behind the pair of pressure rollers.

8. The single-unit manufacturing apparatus of claim 1, wherein the first diaphragm comprises an SRS composed of inorganic particles.

9. A single-cell manufacturing method using a single-cell manufacturing apparatus according to any one of claims 1 to 8, the single-cell manufacturing method comprising: The step of supplying the first diaphragm and placing the negative electrode on the upper surface of the first diaphragm (S1); Step (S2) of supplying the second diaphragm to the upper surface of the negative electrode and placing the positive electrode on the upper surface of the second diaphragm; Step (S3) of pressing the first diaphragm, the negative electrode, the second diaphragm, and the positive electrode to form a stack; and Step (S4) of cutting the stack at predetermined intervals to prepare a single unit, wherein After step S3, the gloss of the first diaphragm is further measured.

10. The single-unit manufacturing method according to claim 9, wherein the step of measuring gloss is performed after step S4.

11. The single-unit manufacturing method according to claim 9, further comprising the step (S5) of determining that the single unit is normal when the measured gloss is within a predetermined range and determining that the single unit is defective when the measured gloss deviates from the predetermined range.

12. The single-unit manufacturing method according to claim 11, wherein the normal range and the defective range of gloss are set according to the adhesive force between the first diaphragm and the negative electrode and the permeability between the first diaphragm and the negative electrode.

13. A single unit manufactured by the single unit manufacturing method according to claim 9.

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