WO2022086278A1 - 전지케이스 성형장치 및 이를 이용한 전지케이스 제조방법 - Google Patents
전지케이스 성형장치 및 이를 이용한 전지케이스 제조방법 Download PDFInfo
- Publication number
- WO2022086278A1 WO2022086278A1 PCT/KR2021/014929 KR2021014929W WO2022086278A1 WO 2022086278 A1 WO2022086278 A1 WO 2022086278A1 KR 2021014929 W KR2021014929 W KR 2021014929W WO 2022086278 A1 WO2022086278 A1 WO 2022086278A1
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- WO
- WIPO (PCT)
- Prior art keywords
- battery case
- punch
- laminate sheet
- elastic separator
- holder
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title description 22
- 238000003825 pressing Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 30
- 238000000465 moulding Methods 0.000 claims description 30
- 239000010687 lubricating oil Substances 0.000 claims description 26
- 239000013013 elastic material Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000004308 accommodation Effects 0.000 abstract 2
- 239000012528 membrane Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 22
- 230000007547 defect Effects 0.000 description 5
- 238000003475 lamination Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
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- 239000002480 mineral oil Substances 0.000 description 4
- 235000010446 mineral oil Nutrition 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
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- 239000010685 fatty oil Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
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- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- -1 liquid paraffin Chemical class 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000004034 viscosity adjusting agent Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
- B29C33/424—Moulding surfaces provided with means for marking or patterning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/68—Release sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/261—Handling means, e.g. transfer means, feeding means
- B29C51/262—Clamping means for the sheets, e.g. clamping frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/28—Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/12—Deep-drawing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0468—Compression means for stacks of electrodes and separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3468—Batteries, accumulators or fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7146—Battery-cases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a battery case molding apparatus and a battery case manufacturing method using the same.
- the battery case molding apparatus including a punch for molding a battery case for a pouch-type battery, when the laminate sheet used as the battery case is pressed with the punch, the elasticity to minimize damage to the surface of the laminate sheet
- a battery case molding apparatus including a separator and a battery case manufacturing method using the same.
- Lithium secondary batteries can be classified into cylindrical secondary batteries or prismatic secondary batteries made of metal materials, pouch-type secondary batteries made of laminate sheets, and the like, depending on the shape and material.
- the pouch-type secondary battery is stacked with a high degree of integration to have high energy density per weight, low manufacturing cost, and easy shape deformation, and thus is used in various devices.
- the pouch-type secondary battery uses a laminate sheet including an outer coating layer, a metal blocking layer, and an inner adhesive layer as a battery case, and an electrode assembly and an electrolyte are embedded in a receiving part formed on the laminate sheet.
- a deep-drawing method of pressing the laminate sheet with a punch is used while the laminate sheet is placed on a die and fixed with a gripper.
- a gripper due to the limitation of softness of the laminate sheet and the frictional force between the punch and the laminate sheet, pin-holes or cracks are formed on the outer surface of the laminate sheet during the deep drawing process. A shape defect occurs.
- Patent Document 1 discloses a battery exterior material comprising an outer layer including a heat resistant resin film, a metal foil layer and an inner layer including a thermoplastic resin film to which a lubricant is added, and the lubricant is attached between the outer layer and the inner layer.
- Patent Document 1 since the lubricant is attached between the outer layer and the inner layer, the slidability of the outer layer with respect to the second mold and the slidability of the inner layer with respect to the first mold are improved, thereby suppressing the occurrence of warpage of the outer periphery of the battery packaging material.
- Patent Document 2 discloses a packaging material for molding comprising a substrate layer as an outer layer, a heat-sealable resin layer as an inner layer, and a metal foil layer disposed between both layers, wherein the heat-sealable resin layer is a single layer or multiple layers.
- a packaging material for molding wherein the innermost layer of the heat-sealable resin layer is made of a resin composition containing a heat-sealable resin, an anti-blocking agent, a slip agent, and a fluoropolymer lubricant.
- Patent Document 2 discloses that the sliding property between the surface of the innermost layer of the heat-sealable resin layer and the surface of the molding die is improved during molding of the packaging material, and the moldability can be improved.
- Patent Document 1 and Patent Document 2 do not recognize the problem that defects occur while the battery exterior material is stretched during the drawing process, and do not suggest a method for solving the problem.
- the present invention is to solve the above problems, and a battery case forming apparatus capable of preventing damage to the laminate sheet by reducing the frictional force caused by the contact between the punch for forming the battery case by pressing the laminate sheet and the laminate sheet And an object of the present invention is to provide a method of forming a battery case using the same.
- a battery case forming apparatus for achieving this object includes a punch for forming a battery case by pressing a laminate sheet, a die formed with a receiving part having a size corresponding to an electrode assembly receiving part molded by the punch, and the laminate It may include a holder for fixing the outer periphery of the sheet, and an elastic separator positioned under the punch to prevent the punch from directly contacting the laminate sheet.
- the elastic separator may be fixed to the holder.
- the elastic separator may be fixed to a lower portion of the side surfaces of the holder.
- the bottom surface of the punch may be parallel to the upper surface of the elastic separator.
- a liquid lubricant may be added to a space formed by the elastic separator and the holder.
- At least a portion of the lower surface of the punch may be formed with a groove.
- a pad may be disposed under the receiving part of the die.
- the pad may be made of an elastic material and may have a convexly protruding central portion.
- the central portion of the pad protruding by the pressing of the punch may be compressed so that the overall thickness of the pad may be uniform.
- the elastic separator may be a watertight elastic separator.
- the present invention provides a method for forming a battery case using the battery case forming apparatus.
- the method for forming the battery case includes the steps of (a) disposing a laminate sheet on the upper part of a die, (b) fixing the laminate sheet to the die using a holder to which an elastic separator is attached, and ( c) using a punch to press the elastic separator and the laminate sheet.
- the method may further include adding a liquid lubricant into the space formed by the elastic separator and the holder.
- step (c) the pad disposed under the receiving part of the die may be compressed and pressed until it becomes flat.
- the liquid lubricant may move to the edge of the lower surface of the punch.
- the region in which the laminate sheet is stretched by the pressing in step (c) may be a side surface of the electrode assembly accommodating part and a bottom outer periphery of the electrode assembly accommodating part.
- the present invention also provides a battery case manufactured using the battery case molding apparatus, wherein the thickness of the thinnest part of the battery case may be 70% or more of the thickest part.
- the electrode assembly receiving part is formed with an elastic separator interposed between the laminate sheet and the punch, the punch prevents direct contact with the laminate sheet, thereby preventing the punch surface and the laminate sheet surface It is possible to minimize the stick-slip effect that occurs in
- the friction force between the punch and the laminate sheet can be reduced by adding a liquid lubricant.
- liquid lubricant and the elastic separator due to the addition of the liquid lubricant and the elastic separator, it is possible to expand the stretched area of the laminate sheet, and thus, it is possible to prevent the laminate sheet from being thinly stretched excessively locally.
- the depth of the electrode assembly housing portion can be formed more deeply, increasing the capacity and energy density of the battery cell. can be improved
- FIG. 1 is a cross-sectional view of an apparatus for manufacturing a battery case according to a first embodiment of the present invention.
- FIG. 2 is an exploded perspective view of an apparatus for manufacturing a battery case according to a first embodiment of the present invention.
- FIG 3 is a cross-sectional view of an apparatus for manufacturing a battery case according to a second embodiment of the present invention.
- FIG. 4 is a cross-sectional view of an apparatus for manufacturing a battery case according to a third embodiment of the present invention.
- FIG. 5 is an exploded perspective view of an apparatus for manufacturing a battery case according to a third embodiment of the present invention.
- FIG. 6 is a vertical cross-sectional view of a battery case manufactured by the battery case molding apparatus according to the present invention.
- FIG. 7 is a vertical cross-sectional view of the center of the punch according to the present invention.
- FIG. 8 is a sequence diagram illustrating a battery case manufacturing process according to the present invention.
- FIG. 1 is a front view of an apparatus for manufacturing a battery case according to a first embodiment of the present invention
- FIG. 2 is an exploded perspective view of the apparatus for manufacturing a battery case according to a first embodiment of the present invention.
- the battery case manufacturing apparatus 100 includes a punch 110 for forming a battery case by pressing the laminate sheet 101 , and receiving a size corresponding to the electrode assembly receiving part molded by the punch.
- the die 120 on which the part 121 is formed, the holder 130 for fixing the outer periphery of the laminate sheet 101, and the punch 110 to prevent the punch 110 from directly contacting the laminate sheet 101 It includes an elastic separator 140 positioned under the.
- the laminate sheet 101 is disposed on the die 120 in which the receiving part 121 of the size corresponding to the electrode assembly receiving part is formed, and the laminate sheet 101 ) in a state in which the outer periphery is fixed to the die using the holder 130 , the laminate sheet 101 is pressed with the punch 110 to form the electrode assembly receiving portion.
- an elastic separator 140 is disposed between the laminate sheet and the punch.
- the lamination sheet is pressed with a punch in a state where the elastic separator 140 is disposed between the laminate sheet 101 and the punch 110, the lamination sheet surface and the punch surface do not directly contact. Accordingly, it is possible to prevent the conventional problems in that the surface of the punch is not smooth or that foreign substances are introduced between the punch and the lamination sheet and the lamination sheet is scratched.
- the x-axis direction width w1 of the punch 110 is smaller than the x-axis direction spacing w2 of the die, and the x-axis direction spacing w2 of the die is smaller than the x-axis direction spacing w3 of the holder. .
- FIG 3 is a cross-sectional view of an apparatus for manufacturing a battery case according to a second embodiment of the present invention.
- the battery case forming apparatus 200 includes a punch 210 for forming the battery case by pressing the laminate sheet 201 , and a receiving part 221 having a size corresponding to the electrode assembly receiving part molded by the punch. ) formed in the die 220, the holder 230 for fixing the outer periphery of the laminate sheet 201, and the punch 210 in the lower part of the punch 210 to prevent direct contact with the laminate sheet 201 and an elastic separator 240 positioned thereon.
- the elastic separator 240 is fixed to the holder 230 .
- the laminate sheet may be fixed by disposing the holder 230 to which the elastic separator 240 is fixed on the laminate sheet 201 .
- the elastic separator 240 is fixed to the holder 230, when the laminate sheet 201 is pressed with the punch 210, the state in which the elastic separator 240 is fixed to the holder is stably maintained.
- the elastic separator 240 may be attached to the lower surface of the holder 230 , or may be fixed to a lower portion of the side surfaces of the holder 230 .
- the fixing force to the laminate sheet 201 may be higher due to the minutely protruding portion generated when the elastic separator 240 and the holder 230 are combined. there is.
- the elastic separator 240 is fixed to the lower portion of the side surfaces of the holder 230 , in particular, when the elastic separator 240 is fixed while being inserted into a groove formed in the lower portion of the side surfaces of the holder 230 , the elastic separator 240 is fixed. ) and the holder 230 has a stronger bonding force, which is why the elastic separator 240 is coupled even if it is excessively elongated, which is more advantageous when the depth of the accommodating part is deep.
- the bottom surface of the punch is positioned parallel to the upper surface of the elastic separator.
- the elastic separator and the laminate sheet are positioned in parallel. Therefore, when the punch presses the elastic separator, the entire area of the punch may apply a uniform pressure to the entire area of the elastic separator and the laminate sheet.
- the force applied by the punch is applied to the elastic separator and the laminate sheet in the same size and direction, and the deformed form of the laminate sheet is regarded as the same as the deformed form of the elastic separator.
- FIG. 4 is a cross-sectional view of an apparatus for manufacturing a battery case according to a third embodiment of the present invention
- FIG. 5 is an exploded perspective view of the apparatus for manufacturing a battery case according to a third embodiment of the present invention.
- the battery case forming apparatus 300 includes a punch 310 for forming the battery case by pressing the laminate sheet 301 , and receiving a size corresponding to the electrode assembly receiving part molded by the punch.
- the elastic separator 340 is fixed to the holder 330 . Accordingly, the elastic separator becomes the lower surface, and a space is formed with the inner surface of the holder 330 as a side wall, and a liquid lubricant 350 is added to the space. Since the elastic separator is a watertight elastic separator, the liquid lubricant cannot flow through the elastic separator and can only move within the space.
- the liquid lubricant has an effect of remarkably reducing the frictional force between the punch and the elastic separator, and can very smoothly slide between the surface of the elastic separator and the surface of the punch.
- the area to be stretched by the punch is widened, so that the average elongation of the stretched area may be lowered.
- the thickness of the laminate sheet in the stretched state may be about 70% or more of the thickness of the laminate sheet before stretching.
- liquid lubricant for example, hydrocarbons such as liquid paraffin, oils and fats, grease, mineral vegetable oil, emulsified oil, anti-emulsifier, pour point depressant, viscosity modifier, defoaming agent, pure mineral oil, mineral oil including pure mineral oil or additives , at least one selected from the group consisting of a fatty oil including animal oil and vegetable oil, a mixed oil mixed with mineral oil and fatty oil, and a synthetic oil may be used.
- hydrocarbons such as liquid paraffin, oils and fats, grease, mineral vegetable oil, emulsified oil, anti-emulsifier, pour point depressant, viscosity modifier, defoaming agent, pure mineral oil, mineral oil including pure mineral oil or additives , at least one selected from the group consisting of a fatty oil including animal oil and vegetable oil, a mixed oil mixed with mineral oil and fatty oil, and a synthetic oil may be used.
- liquid lubricant by using the liquid lubricant, excessive stretching in localized areas of the laminate sheet can be prevented.
- the electrode assembly accommodating part 410 is concavely formed in the battery case 400 , and the electrode assembly accommodating part 410 includes a bottom 411 of the electrode assembly accommodating part and a side surface 412 of the electrode assembly accommodating part. ) can be composed of
- the stretching area is extended not only to the main stretching region E1 but also to the additional stretching region E2. That is, the region in which the laminate sheet is stretched may be a portion that becomes the outer periphery of the side surface 412 of the electrode assembly receiving unit and the bottom 411 of the electrode assembly receiving unit.
- the thickness reduction rate of the battery case can be reduced even after the battery case is molded, and it is possible to prevent the battery case from being weakened locally.
- the thickness of the thinnest part may maintain a thickness of 70% or more of the thickest part.
- a pad 360 is disposed under the receiving part 321 of the die 320 .
- the pad 360 may be made of a material having elasticity so as to be contracted by the punch 310 .
- the pad 360 may have a rectangular shape in plan view, a central portion protruding convexly, and a thickness decreasing toward the outer periphery. Accordingly, in the process of forming the laminate sheet by pressing with the punch 310, the protruding center portion of the pad first comes into contact with the laminate sheet moving downward by the punch. After that, when the punch is continuously pressed downward, the central portion of the protruding pad is compressed and the overall thickness of the pad becomes uniform. Accordingly, the bottom of the electrode assembly accommodating part may have a flat shape.
- FIG. 7 is a vertical cross-sectional view of the center of the punch according to the present invention.
- grooves 411 and 511 are formed on the lower surfaces of the punch 410 and the punch 510 , respectively.
- the groove 411 formed in the punch 410 is formed so that the center of the lower surface of the punch is concave, and the groove 511 formed in the punch 510 is formed so that the lower surface of the punch is concave as a whole.
- a space is formed on the lower surface of the punch by the groove formed in this way.
- FIG. 8 is a view showing a battery case forming method according to the present invention from left to right, from top to bottom.
- the battery case forming method according to the present invention comprises the steps of disposing a laminate sheet 301 on an upper portion of a die 320, and using a holder 330 to which an elastic separator 340 is attached to a die ( The step of fixing to the 320, and the step of pressing the elastic separator 340 and the laminate sheet 301 using the punch (310).
- a liquid lubricant 350 is added into the space formed by the elastic separator 340 and the holder 330 . do. Since the elastic separator according to the present invention is a watertight elastic separator, the liquid lubricant does not flow out of the elastic separator.
- the pad 360 disposed under the receiving portion of the die 320 is pressed until it is compressed and flat.
- the pad 360 has a shape in which the center protrudes and the thickness becomes thinner toward the outer periphery, and the laminate sheet 301 first comes into contact with the protruding center of the pad 360 .
- the liquid lubricant 350 not only moves to the edge of the lower surface of the punch 310 , but also moves along the side of the punch 310 . Accordingly, the liquid lubricant 350 may exist not only on the lower surface of the punch 310 and the surface of the elastic separator 340 , but also between the side surface of the punch 310 and the surface of the elastic separator 340 , between the punch and the elastic separator. It has the effect of lowering the frictional force of As the pressure increases, the liquid lubricant 350 spreads more widely due to capillary action.
- a pad having a convex center is disposed below the receiving portion of the die, so that the liquid lubricant can easily move to the main stretch area and the additional stretch area of the laminate sheet. Therefore, by minimizing the frictional force between the surface of the elastic separator and the surface of the punch, it is possible to secure a wide additional stretch area of the laminate sheet, and to manufacture a battery case with little reduction in local thickness.
- the present invention provides an apparatus for forming a battery case including a punch for molding a battery case for a pouch-type battery. It relates to a battery case molding apparatus including a separator and a battery case manufacturing method using the same, which can be used in industry.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
Claims (16)
- 라미네이트 시트를 가압하여 전지케이스를 성형하는 펀치;상기 펀치에 의해 성형되는 전극조립체 수납부와 대응되는 크기의 수용부가 형성된 다이;상기 라미네이트 시트의 외주변을 고정하기 위한 홀더; 및상기 펀치가 상기 라미네이트 시트와 직접 접촉하는 것을 방지하기 위해 상기 펀치의 하부에 위치하는 탄성 분리막;을 포함하는 전지케이스 성형장치.
- 제1항에 있어서,상기 탄성 분리막은 상기 홀더에 고정되어 있는 전지케이스 성형장치.
- 제2항에 있어서,상기 탄성 분리막은 상기 홀더의 측면 중 하부에 고정되어 있는 전지케이스 성형장치.
- 제1항에 있어서,상기 펀치가 상기 전지케이스를 성형하기 전에, 상기 펀치의 밑면은 상기 탄성 분리막의 상면과 평행한 전지케이스 성형장치.
- 제2항에 있어서,상기 탄성 분리막과 상기 홀더로 형성된 공간 내에 액체 윤활제가 부가된 전지케이스 성형장치.
- 제1항에 있어서,상기 펀치의 하면 중 적어도 일부에는 홈이 형성된 전지케이스 성형장치.
- 제1항에 있어서,상기 다이의 수용부 하부에는 패드가 배치되어 있는 전지케이스 성형장치.
- 제7항에 있어서,상기 패드는 탄성이 있는 재질로서 중심부가 볼록하게 돌출된 전지케이스 성형장치.
- 제7항에 있어서,상기 패드는 상기 펀치의 가압에 의해 돌출된 중심부가 압축되어 패드의 전체적인 두께가 균일해지는 전지케이스 성형장치.
- 제1항에 있어서,상기 탄성 분리막은 수밀성 탄성 분리막인 전지케이스 성형장치.
- 제1항 내지 제10항 중 어느 한 항에 따른 전지케이스 성형장치를 이용한 전지케이스의 성형방법으로서,(a) 다이의 상부에 라미네이트 시트를 배치하는 단계;(b) 탄성 분리막이 부착된 홀더를 이용하여 상기 라미네이트 시트를 상기 다이에 고정하는 단계; 및(c) 펀치를 이용하여 상기 탄성 분리막과 상기 라미네이트 시트를 가압하는 단계;를 포함하는 전지케이스의 성형방법.
- 제11항에 있어서,상기 (b)단계와 상기 (c)단계 사이에, 상기 탄성 분리막과 상기 홀더로 형성된 공간 내에 액체 윤활제를 부가하는 단계를 더 포함하는 전지케이스의 성형방법.
- 제11항에 있어서,상기 (c)단계는, 상기 다이의 수용부 하부에 배치된 패드가 압축되어 평평해질 때까지 가압하는 전지케이스의 성형방법.
- 제13항에 있어서,상기 패드가 압축되기 시작하면, 상기 액체 윤활제는 상기 펀치 하면의 가장자리로 이동하는 전지케이스의 성형방법.
- 제11항에 있어서,상기 (c)단계의 가압에 의해서 상기 라미네이트 시트가 연신되는 영역은 전극조립체 수납부의 측면 및 상기 전극조립체 수납부의 바닥 외주부가 되는 부분인 전지케이스의 성형방법.
- 제1항 내지 제10항 중 어느 한 항에 따른 전지케이스 성형장치를 이용하여 제조된 전지케이스에서,가장 두께가 얇은 부분의 두께는 가장 두께가 두꺼운 부분의 70% 이상인 전지케이스.
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US17/924,597 US20230187738A1 (en) | 2020-10-22 | 2021-10-22 | Battery Case Shaping Apparatus and Battery Case Manufacturing Method Using the Same |
EP21883345.7A EP4108416A4 (en) | 2020-10-22 | 2021-10-22 | DEVICE FOR SHAPING A BATTERY CASE AND METHOD FOR PRODUCING A BATTERY CASE THEREFROM |
CN202180022196.2A CN115362054A (zh) | 2020-10-22 | 2021-10-22 | 电池壳体成形设备及使用该电池壳体成形设备的电池壳体制造方法 |
JP2022560926A JP7464333B2 (ja) | 2020-10-22 | 2021-10-22 | 電池ケース成形装置及びこれを用いた電池ケース製造方法 |
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KR1020200137864A KR20220053414A (ko) | 2020-10-22 | 2020-10-22 | 전지케이스 성형장치 및 이를 이용한 전지케이스 제조방법 |
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KR (1) | KR20220053414A (ko) |
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- 2021-10-22 CN CN202180022196.2A patent/CN115362054A/zh active Pending
- 2021-10-22 EP EP21883345.7A patent/EP4108416A4/en active Pending
- 2021-10-22 US US17/924,597 patent/US20230187738A1/en active Pending
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JP7464333B2 (ja) | 2024-04-09 |
KR20220053414A (ko) | 2022-04-29 |
EP4108416A1 (en) | 2022-12-28 |
JP2023521691A (ja) | 2023-05-25 |
US20230187738A1 (en) | 2023-06-15 |
EP4108416A4 (en) | 2023-09-27 |
CN115362054A (zh) | 2022-11-18 |
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