WO2018105096A1 - フィルム外装電池の製造方法およびフィルム外装電池 - Google Patents
フィルム外装電池の製造方法およびフィルム外装電池 Download PDFInfo
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- WO2018105096A1 WO2018105096A1 PCT/JP2016/086681 JP2016086681W WO2018105096A1 WO 2018105096 A1 WO2018105096 A1 WO 2018105096A1 JP 2016086681 W JP2016086681 W JP 2016086681W WO 2018105096 A1 WO2018105096 A1 WO 2018105096A1
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- tab
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- film
- sealing process
- tab region
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims description 108
- 238000000034 method Methods 0.000 claims description 87
- 230000008569 process Effects 0.000 claims description 85
- 239000005001 laminate film Substances 0.000 claims description 43
- 238000010248 power generation Methods 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 12
- 239000003792 electrolyte Substances 0.000 claims description 5
- 229920003002 synthetic resin Polymers 0.000 claims description 5
- 239000000057 synthetic resin Substances 0.000 claims description 5
- 239000012793 heat-sealing layer Substances 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 4
- 238000005304 joining Methods 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 description 15
- 239000011347 resin Substances 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 230000012447 hatching Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000004840 adhesive resin Substances 0.000 description 4
- 229920006223 adhesive resin Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
-
- 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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
-
- 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
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
-
- 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
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
- H01M50/121—Organic material
-
- 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
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
- H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
-
- 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 method for manufacturing a film-clad battery in which a power generation element is housed together with an electrolyte in an exterior body made of a laminate film having flexibility, and in particular, laminating in a state where an electrode tab protruding from the power generation element is sandwiched.
- the present invention relates to an improvement in a sealing process for heat-sealing a film.
- a film-sheathed battery is known.
- a positive and negative electrode tab made of a thin metal plate is sandwiched between the joining surfaces. Two laminated films are heat-sealed.
- both the part where the laminate films are joined without the electrode tab and the part where the electrode tab is interposed are simultaneously heat-sealed by the same heat block. I am doing so.
- the electrode tab made of metal not only has a large heat capacity itself, but also is deprived of heat by the positive and negative electrode metal current collectors because it is connected to the power generation element inside the exterior body. Therefore, in one side to be heat-sealed, a suitable temperature condition and pressure condition are different between the part where the laminate films are joined without the electrode tab and the part where the electrode tab is interposed. It becomes. Therefore, in the conventional method in which both are heated and pressurized by the same heat block and thermally fused, each part cannot be sealed under optimum conditions, and the sealing quality is low.
- the region overlapping the electrode tab is formed by the heat block for the tab region.
- the tab area sealing process for heat sealing and the non-tab area sealing process for heating and sealing the area that does not overlap with the electrode tab in the above-described seal line by the non-tab area heat block are performed separately. I made it.
- each processing condition for example, temperature, pressure, heating time, etc.
- each processing condition for example, temperature, pressure, heating time, etc.
- Process explanatory drawing which showed the principal part of the battery manufacturing method of one Example.
- Explanatory drawing which shows the tab area
- region The perspective view of the heat block for non-tab area
- Explanatory drawing which shows the non-tab area
- FIG. 1 is a process explanatory view showing the main part of the battery manufacturing method of one embodiment.
- a film-clad battery a film-clad lithium ion secondary battery having a flat shape constituting a power supply pack for driving a vehicle such as an electric vehicle or a hybrid vehicle is targeted.
- the film-clad battery of one example has basically the same configuration as that described in Japanese Patent Application Laid-Open No. 2013-140782, Japanese Patent Application Laid-Open No. 2015-37047, and the like, and is a positive electrode configured in a rectangular sheet shape.
- a power generation element (which is also referred to as an electrode laminate) is formed by laminating a plurality of anodes and a negative electrode via a separator, and the power generation element is accommodated together with an electrolyte in a bag-shaped exterior body made of a laminate film. is there.
- the battery after the power generation element is accommodated in the film-shaped outer package is simply referred to as a “cell” regardless of the manufacturing process.
- step S1 is an electrode lamination process that constitutes the power generation element.
- a positive electrode, a negative electrode, and a separator wound in a roll shape are sequentially stacked while being cut into a rectangular sheet, so that a power generation element, that is, an electrode, in which a plurality of positive electrodes and negative electrodes are stacked via a separator.
- a laminate is formed.
- the positive electrode is obtained by applying a positive electrode active material as a slurry containing a binder to both surfaces of an aluminum foil serving as a current collector, and drying and rolling to form an active material layer having a predetermined thickness.
- the negative electrode is obtained by applying a negative electrode active material as a slurry containing a binder to both surfaces of a copper foil serving as a current collector, and drying and rolling to form an active material layer having a predetermined thickness.
- the separator has a function of preventing a short circuit between the positive electrode and the negative electrode and at the same time holding the electrolytic solution.
- the separator is a microporous film or a nonwoven fabric of a synthetic resin such as polyethylene (PE) or polypropylene (PP). Consists of.
- positive electrodes, negative electrodes, and separators are fixed with tape in a state where a predetermined number of layers are stacked, and become a power generation element, that is, an electrode stack.
- the ends of the current collectors of the plurality of positive electrodes are overlapped with each other, and an electrode tab that is a positive terminal, that is, a positive electrode tab is ultrasonically welded.
- the ends of the current collectors of the plurality of negative electrodes are overlapped with each other, and an electrode tab that is a negative terminal, that is, a negative electrode tab, is ultrasonically welded.
- the positive electrode tab is made of a strip-like thin aluminum plate
- the negative electrode tab is made of a strip-like thin copper plate. That is, each is comprised from the same kind of metal as an electrical power collector.
- the power generation element configured in this manner is placed in a flexible film-shaped exterior body in a sealing process shown as the next step S2.
- the exterior body is made of, for example, a laminate film having a four-layer structure in which a heat-sealing layer made of polypropylene is laminated inside an aluminum foil and a polyamide resin layer and a polyethylene terephthalate resin layer are laminated on the outside as a protective layer. .
- the thickness of the entire laminate film is, for example, about 0.15 mm.
- the outer package has a two-sheet structure of one laminate film disposed on the lower surface side of the power generation element and another laminate film disposed on the upper surface side.
- the exterior body has a bag-like configuration with an open inlet.
- the positive electrode tab and the negative electrode tab are located on the side facing the side when the one side having the injection port is directed upward, and are led out from the bonding surface of the laminate film. Details of this sealing step will be described later.
- the cell configured in a state where the power generation element is accommodated in the film-shaped outer package in the sealing step is then transferred to the liquid injection step shown as step S3.
- a cell is placed in a decompression chamber, and a liquid injection nozzle of a dispenser is inserted into the inlet of the exterior body under a predetermined pressure reduction to fill (inject) the electrolytic solution.
- the inlet is sealed by thermal fusion as the inlet sealing step (step S4) while maintaining the cell posture.
- the sealing is a so-called temporary sealing, and after charging, which will be described later, the inlet (or the vicinity thereof) is opened in order to vent the gas generated with the charging. Sealing is performed.
- step S5 Next to the inlet sealing process in step S4, as the impregnation process in step S5, the process is left for a predetermined time (for example, several hours to several tens of hours) in order to wait for sufficient penetration of the electrolyte into the power generation element. Thereafter, in step S6, initial charging is performed. And it progresses to next processes, such as an aging process outside a figure.
- a predetermined time for example, several hours to several tens of hours
- step S2 which is the main part of the present invention.
- FIG. 2 shows the cell 1 that has undergone the sealing process, and as described above, the power generation element (electrode laminate) 3 indicated by the phantom line is accommodated in the exterior body 2 made of a laminate film.
- the power generation element 3 includes a positive electrode tab 4 and a negative electrode tab 5 arranged side by side.
- the exterior body 2 includes a first side 7 from which a positive electrode tab 4 and a negative electrode tab 5 (both are collectively referred to as an electrode tab) are derived, and a second side 8 that faces the first side 7;
- On the negative electrode tab 5 side it is configured in a rectangular shape having four sides of a third side 9 connecting the first side 7 and the second side 8 and a fourth side 10 serving as a liquid inlet.
- the three sides 7, 8, and 9 excluding the fourth side 10 serving as the inlet are heat sealed by a pair of heat blocks.
- thin strip-shaped seal lines 11, 12, and 13 constituted by heat fusion using a heat block are shown by hatching. These three seal lines 11, 12, and 13 basically extend in a straight line, and form a continuous seal line by crossing each other at the end.
- the seal line 12 on the second side 8 and the seal line 13 on the third side 9 are obtained by bonding the laminate films together.
- the seal line 11 on the first side 7 is set continuously so as to form a straight line across the positive electrode tab 4 and the negative electrode tab 5, and the two laminated films are formed on the positive electrode tab. 4 and the negative electrode tab 5 are joined together.
- the seal line 11 on the first side 7 has two regions 11a where the electrode tabs 4 and 5 and the laminate film overlap (referred to as tab regions) 11a, and the electrode tabs 4 and 5 overlap.
- 3b (hereinafter referred to as a non-tab region) 11b to which the laminate films are joined together, and these constitute a single elongated strip-shaped seal line 11 continuously.
- a synthetic resin layer called “adhesive resin” is provided in advance in a band shape corresponding to a portion where the seal line 11 crosses. In the tab region 11 a, this synthetic resin is provided.
- a heat-sealing layer of a laminate film is bonded on the layer.
- two strip-shaped polypropylene films are attached to the surface of the electrode tabs 4 and 5 so as to sandwich the electrode tabs 4 and 5 from both sides of the electrode tabs 4 and 5, and are shown in FIG. 2.
- the leading resin 15 is formed, and the sealing wire 11 crosses over the leading resin 15.
- the sealing process of the tab area 11a (tab area sealing process) and the sealing process of the non-tab area 11b (non-tab area sealing process) are respectively a tab area heat block or a non-tab area described later. It is carried out individually using a heat block.
- FIG. 3 shows an example of a specific process sequence for sealing the three seal lines 11, 12, and 13 described above.
- the first step (a) the two tab regions 11a overlapping with the positive electrode tab 4 and the negative electrode tab 5 are sealed.
- This uses a pair of tab area heat blocks configured to include two tab areas 11a, and a pressure suitable for bonding the laminate film to the electrode tabs 4 and 5 (specifically, the front surface resin 15) It is performed by heating while pressurizing with temperature.
- sealing processing is performed on three non-tab regions 11b that do not overlap the electrode tabs 4 and 5 in the seal wire 11. This is performed by using a pair of non-tab region heat blocks configured to include three non-tab regions 11b and heating while applying pressure at a pressure and temperature suitable for joining the laminate films.
- the seal line 11 along the first side 7 across the electrode tabs 4 and 5 is completed in a sealed state.
- the sealing process of the seal line 12 along the second side 8 is performed. This is performed by using a pair of heat blocks having a shape corresponding to the seal wire 12 and heating while applying pressure with a pressure and temperature suitable for joining the laminate films. Since the seal line 12 and the seal line 11 do not intersect, the sealing process of the non-tab region 11b in the step (b) and the sealing process of the seal line 12 in the step (c) are performed on one cell 1. It is also possible to carry out substantially simultaneously.
- the sealing process is performed on the seal line 13 along the third side 9 which is the bottom side during the injection. This is performed by using a pair of heat blocks having a shape corresponding to the seal line 13 and heating while applying pressure with a pressure and temperature suitable for joining the laminate films. Note that both end portions of the seal wire 13 extend to positions intersecting with the end portions of the seal wire 11 and the seal wire 12, whereby the exterior body 2, that is, the laminate film is configured in a bag shape.
- Each of the heat blocks used in each process has a basic configuration in which a rod-shaped electric heater (not shown) is built in a steel main body having an elongated rectangular parallelepiped shape.
- FIG. 4 is an explanatory view of the sealing process of the tab region 11a in the step (a).
- two laminated films 20 are sandwiched from both sides along with the electrode tabs 4 and 5 along the seal line 11.
- a pair of tab area heat blocks 21 are used.
- (A) in the figure shows a state in which the pair of tab area heat blocks 21 are open to each other, and
- FIG. 5 is a perspective view showing a schematic shape of the heat block 21 for the tab area.
- the pair of tab area heat blocks 21 basically have a symmetrical shape, and correspond to the two tab areas 11a with respect to the reference plane 22 set so as not to contact the surface of the laminate film 20.
- Two processed parts 23 and 24 are formed in a protruding shape.
- One processed portion 23 corresponding to the positive electrode tab 4 has a protruding amount corresponding to the thickness of the positive electrode tab 4, and the other processed portion 24 corresponding to the negative electrode tab 5 is protruded amount corresponding to the thickness of the negative electrode tab 5.
- the protruding amounts of the two are different from each other.
- the thicknesses of the positive electrode tab 4 and the negative electrode tab 5 themselves are about 0.4 mm and 0.2 mm, respectively, and the thicknesses including the tip resin 15 are 0.7 mm and 0. It is about 4 mm.
- the processed portion 23 is more specifically, a main processed surface 23a that pressurizes and heats the laminate film 20 that overlaps the positive electrode tab 4, and a minute amount from the main processed surface 23a at both ends of the main processed surface 23a.
- an auxiliary processing surface 23b provided in a protruding state.
- the main processing surface 23a has a width that is slightly larger than the width of the metal positive electrode tab 4, and the auxiliary processing surface 23b is formed of the tip resin 15 that protrudes laterally from the metal positive electrode tab 4.
- the processed portion 24 is also the same, and the main processed surface 24a that pressurizes and heats the laminate film 20 that overlaps the negative electrode tab 5, and a state in which a minute amount protrudes from the main processed surface 24a at both ends of the main processed surface 24a. And an auxiliary machining surface 24b provided.
- the main processing surface 24a has a width that is slightly larger than the width of the metal negative electrode tab 5, and the auxiliary processing surface 24b is formed of the tip resin 15 that protrudes laterally from the metal negative electrode tab 5. It is provided at a position overlapping the overhanging portion 15a (see FIG. (B)).
- the tab region 11a is sealed by pressing and heating the laminate film 20 from both sides together with the electrode tabs 4 and 5 using the tab region heat block 21 described above. Do. Thereby, the laminate film 20 is joined to the surface of the metal electrode tabs 4 and 5 via the tip resin 15. Further, as a result of pressurization of the entire leading resin 15 by the main processed surfaces 23a and 24a, a part of the softened leading resin 15 extends sideways as an overhanging portion 15a, and the leading edge of the overhanging portion 15a is a laminate film. 20 and the auxiliary processing surfaces 23b and 24b.
- the sealing process of the tab region 11a is that the heat capacity of the electrode tabs 4 and 5 is large, and that heat is transferred to the current collector of the internal power generation element 3 through the metal electrode tabs 4 and 5,
- pressurization / heating is performed at a relatively high processing temperature, for example, about 230 ° C., for a relatively long time, for example, about 6 seconds.
- the pressure at the time of processing is also set to be relatively high. For example, a pressure of about 7 MPa is applied to the heat block 21 for the tab area.
- FIG. 7 is an explanatory view of the sealing process of the non-tab region 11b in the step (b) of FIG. 3, where a pair of non-tab regions 20 sandwiching the two laminated films 20 from both sides along the seal line 11 are illustrated.
- a tab area heat block 31 is used.
- (A) of a figure shows the state where a pair of non-tab area
- (B) of a figure is the state which is pressurizing and heating with a pair of non-tab area
- FIG. 8 is a perspective view showing a schematic shape of the heat block 31 for the non-tab region.
- the pair of non-tab region heat blocks 31 basically have a symmetrical shape, and each of the three non-tab regions 11b has a reference surface 32 set so as not to contact the surface of the laminate film 20.
- Three corresponding processing parts 33, 34, and 35 are formed in a protruding shape. These three processed parts 33, 34, and 35 all have the same amount of protrusion.
- the processed portions 33, 34, and 35 are more specifically, main processed surfaces 33a, 34a, and 35a for pressurizing and heating the laminate films 20, and main ends at the main processed surfaces 33a, 34a, and 35a.
- Auxiliary processing surfaces 33b, 34b, and 35b provided in a state of being retracted by a small amount from the processing surfaces 33a, 34a, and 35a.
- the main processed surfaces 33a, 34a, and 35a are provided in the non-tab region 11b in a range that does not overlap the overhanging portion 15a of the tip resin 15, and the auxiliary processed surfaces 33b, 34b, and 35b are formed of the metal electrode tab 4. , 5 is provided at a position that overlaps the leading edge of the protruding portion 15a of the adhesive resin 15 protruding sideways (that is, the boundary between the bonded portions of the two laminated films 20).
- the auxiliary processing surfaces 23b, 24b of the tab region heat block 21 and the auxiliary processing surfaces 33b, 34b, 35b of the non-tab region heat block 31 used in the sealing process of the tab region 11a are described above. It is comprised so that it may mutually overlap on the front-end edge of the overhang
- the non-tab region 11b is sealed by using the non-tab region heat block 31 and bonding the two laminated films 20 that do not overlap the electrode tabs 4 and 5 together. Pressurize and heat from both sides. Thereby, the two laminate films 20 are joined to each other. Further, the vicinity of the leading edge of the overhanging portion 15a of the adhesive resin 15 already fused by the sealing process of the tab region 11a is pressed and heated again by the auxiliary processing surfaces 33b, 34b, and 35b together with the laminate film 20. That is, the pressurization / heating region by the tab region heat block 21 and the pressurization / heating region by the non-tab region heat block 31 are slightly overlapped, and this overlap region is the leading edge of the overhanging portion 15a. Located on the top.
- the auxiliary processing surfaces 23b and 24b of the tab region heat block 21 have a width of about 2 mm
- the auxiliary processing surfaces 33b, 34b and 35b of the non-tab region heat block 31 have a width of about 1 mm.
- the two overlap each other by the width of the auxiliary processing surfaces 33b, 34b, 35b of the non-tab region heat block 31 (that is, about 1 mm).
- auxiliary processing surfaces 23b and 24b of the tab region heat block 21 slightly protrude from the main processing surfaces 23a and 24a, and the auxiliary processing surfaces 33b, 34b and 35b of the non-tab region heat block 31 are main processing surfaces 33a and 34a. , 35a slightly receding from the electrode tabs 4 and 5 so that the portion of the two laminated films 20 simply overlaps between the two laminated films 20 and the overhanging of the leading resin 15 is performed. A level difference from the portion where the portion 15a is interposed is absorbed.
- the non-tab region 11b is sealed in a relatively low processing temperature, for example, about 200 ° C., considering that there is no heat absorption by the electrode tabs 4 and 5 and the laminate films 20 are heat-sealed relatively easily. And pressurizing and heating for a relatively short time, for example, about 1 to 2 seconds.
- the pressure during processing is also set to be relatively low. For example, a pressure of about 1 MPa is applied to the heat block 31 for the non-tab region.
- step (c) and step (d) in FIG. 3 are the joining of the two laminate films 20 similarly to the non-tab region 11b, the sealing is performed under the same processing conditions as the sealing process of the non-tab region 11b. Stop processing is performed.
- the sealing process of the seal line 12 in the step (c) can be performed substantially simultaneously with the sealing process of the non-tab region 11b.
- the optimum processing conditions for the tab region 11a and the non-tab region 11b for the seal wire 11 crossing the electrode tabs 4 and 5, respectively.
- high sealing quality as a whole can be obtained. That is, if the tab region 11a and the non-tab region 11b are simultaneously pressurized and heated by the heat block and thermally fused as in the conventional case, the processing conditions such as temperature, pressure, and time cannot be individually set. Therefore, the sealing process must be performed under the processing conditions that are a compromise between the two, and the sealing quality is likely to deteriorate.
- the electrode tabs 4 and 4 are formed between the processing surface corresponding to the tab region 11a and the processing surface corresponding to the non-tab region 11b as a heat block.
- a heat block having a step corresponding to the thickness of 5 will be used, even if the step is set appropriately, the thickness change accompanying the softening / melting of the resin layer at the time of processing is different from the tab region 11a. Since it differs from the non-tab region 11b, the substantial pressure receiving area fluctuates in the middle of processing, and an appropriate pressure cannot be maintained. In the above embodiment, such a change in pressure due to a substantial change in pressure receiving area can also be suppressed.
- the tab region 11a is sealed first and the non-tab region 11b is sealed next in the order of steps (a) and (b) in FIG. It is also possible to reverse.
- FIGS. 10 to 13 show a second embodiment in which the non-tab region 11b is first sealed and the tab region 11a is then sealed.
- FIG. 10 is an explanatory diagram of the sealing process of the non-tab region 11b performed first, and FIG. 10A shows a state where the pair of non-tab region heat blocks 31 are open to each other.
- (B) has shown the state which is pressurized and heated with a pair of heat block 31 for non-tab area
- the sealing process of the non-tab region 11b is relatively similar to the above-described embodiment, considering that there is no heat absorption by the electrode tabs 4 and 5, and the laminate films 20 are relatively easily heat-sealed.
- Pressurization and heating is performed at a low processing temperature, for example, about 200 ° C., for a relatively short time, for example, about 1 to 2 seconds.
- the pressure during processing is also set to be relatively low. For example, a pressure of about 1 MPa is applied to the heat block 31 for the non-tab region.
- auxiliary processing surfaces 33b, 34b, and 35b included in the non-tab region heat block 31 are the leading edges (that is, two laminates) of the protruding portion 15a of the front resin 15 that protrudes laterally from the metal electrode tabs 4 and 5. A portion overlapping the boundary between the joint portions of the films 20 is pressed and heated.
- FIG. 12 is an explanatory diagram of the sealing process of the tab region 11a performed after the non-tab region 11b is sealed.
- FIG. 12A shows a state in which the pair of tab region heat blocks 21 are open to each other.
- (B) of the figure shows a state where pressure and heating are performed by a pair of tab region heat blocks 21. That is, the tab region 11a is sealed using the tab region heat block 21 having the above-described configuration. Thereby, the sealing process of the tab area 11a shown by hatching in FIG. 13 is completed.
- the heat capacity of the electrode tabs 4 and 5 is large, and the current collection of the internal power generation element 3 is performed via the metal electrode tabs 4 and 5, as in the above-described embodiment.
- pressurization / heating is performed at a relatively high processing temperature, for example, about 230 ° C., for a relatively long time, for example, about 6 seconds.
- the pressure at the time of processing is also set to be relatively high. For example, a pressure of about 7 MPa is applied to the heat block 21 for the tab area.
- the auxiliary processing surfaces 23b and 24b included in the heat block 21 for the tab area pressurize and heat a portion overlapping the tip edge of the protruding portion 15a of the adhesive resin 15 protruding sideways from the metal electrode tabs 4 and 5.
- the regions pressed and heated by the auxiliary processing surfaces 23b and 24b are the regions pressed and heated by the auxiliary processing surfaces 33b, 34b and 35b of the non-tab region heat block 31.
- the seal line 11 is configured such that the tab region 11a and the non-tab region 11b are continuously connected with each other by overlapping partially.
- the non-tab region 11b having a relatively low heating temperature is first sealed.
- the heat-sealing layer in the tab region 11a is not unnecessarily heated.
- the sealing process for the non-tab region 11b shown in FIGS. 10 and 11 can be performed substantially simultaneously with the sealing process for the seal line 12 in step (c) of FIG.
- FIGS. 14 and 15 show a third embodiment in which the sealing process of the non-tab region 11b is performed at the same time as the sealing process of the seal line 13 along the third side 9 which is the bottom side at the time of liquid injection.
- a pair of L-shaped heat blocks 41 having a configuration as shown in FIG. 15 is used when sealing the non-tab region 11b.
- a linear first heat block part 41A along the first side 7 and a linear second heat block part 41B along the third side 9 are at an angle of 90 °. It is integrally formed in a continuous shape.
- the first heat block portion 41A has basically the same configuration as the non-tab region heat block 31 described above, and includes three processing portions 33, 34, and 35 corresponding to the non-tab region 11b. Moreover, the 2nd heat block part 41B is provided with the process part 42 which followed the linear form.
- Such an L-shaped heat block 41 simultaneously seals the non-tab region 11b and the seal line 13 in the seal line 11 as shown by hatching in FIG.
- the cycle time can be shortened by performing the sealing process of the non-tab region 11b simultaneously with the sealing process of the seal line 13 or the seal line 12 on the other side. In other words, it is possible to minimize an increase in cycle time associated with separately performing the sealing process of the tab region 11a and the sealing process of the non-tab region 11b.
- the processing time required to individually seal only the tab region 11a is generally required to simultaneously seal the tab region 11a and the non-tab region 11b with the same heat block as before. It becomes shorter than processing time. Accordingly, it is possible to shorten the cycle time of the entire sealing process as compared with the past.
- the sealing process of the tab region 11a with respect to the positive electrode tab 4 and the sealing process of the tab region 11a with respect to the negative electrode tab 5 are simultaneously performed on the seal line 11 on the first side 7. These two sealing processes may be performed as separate processes using separate heat blocks. As described above, the positive electrode tab 4 and the negative electrode tab 5 are different in thickness and material. However, if each is performed in a separate process, sealing can be performed under suitable processing conditions.
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Abstract
Description
Claims (9)
- 複数の正極および負極をセパレータを介して積層してなる発電要素が、熱融着層を備えたラミネートフィルムからなる外装体の中に電解液とともに収容され、上記発電要素の電極タブが上記ラミネートフィルムの接合面から導出されてなるフィルム外装電池の製造方法であって、
少なくとも1つの電極タブが配置された上記外装体の一辺において、上記電極タブを横切って連続的に設定されるシール線の中で、電極タブと重なった領域をタブ領域用ヒートブロックによって加熱封止するタブ領域封止加工と、
上記のシール線の中で、電極タブと重ならない領域を非タブ領域用ヒートブロックによって加熱封止する非タブ領域封止加工と、
を個別に行う、フィルム外装電池の製造方法。 - 上記タブ領域封止加工を行った後に、上記非タブ領域封止加工を行う、請求項1に記載のフィルム外装電池の製造方法。
- 上記非タブ領域封止加工を行った後に、上記タブ領域封止加工を行う、請求項1に記載のフィルム外装電池の製造方法。
- 上記非タブ領域封止加工に比較して、上記タブ領域封止加工を相対的に高い温度で行う、請求項1~3のいずれかに記載のフィルム外装電池の製造方法。
- 上記非タブ領域封止加工に比較して、上記タブ領域封止加工を相対的に高い加圧力でもって行う、請求項1~4のいずれかに記載のフィルム外装電池の製造方法。
- 上記非タブ領域封止加工を、電極タブが配置されていない他の辺の封止加工と同時に行う、請求項1~5のいずれかに記載のフィルム外装電池の製造方法。
- 上記電極タブは、上記シール線が横切る部位に、予め合成樹脂層を備えており、
上記非タブ領域封止加工の加工領域と上記タブ領域封止加工の加工領域とが、上記電極タブから側方へ張り出した上記合成樹脂層の張り出し部の上で、互いにオーバラップしている、請求項1~6のいずれかに記載のフィルム外装電池の製造方法。 - 上記タブ領域用ヒートブロックには、上記張り出し部に対応した補助加工面が上記電極タブに対応した主加工面から微小量突出して設けられており、
上記非タブ領域用ヒートブロックには、上記張り出し部に対応した補助加工面が上記ラミネートフィルムに対応した主加工面から微小量後退して設けられている、請求項7に記載のフィルム外装電池の製造方法。 - 請求項1~8のいずれかに記載の製造方法によって外装体の封止を行った、フィルム外装電池。
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PCT/JP2016/086681 WO2018105096A1 (ja) | 2016-12-09 | 2016-12-09 | フィルム外装電池の製造方法およびフィルム外装電池 |
US16/467,509 US10847779B2 (en) | 2016-12-09 | 2016-12-09 | Film-covered battery production method and film-covered battery |
CN201680091378.4A CN110199403B (zh) | 2016-12-09 | 2016-12-09 | 膜封装电池的制造方法和膜封装电池 |
KR1020197017716A KR102148928B1 (ko) | 2016-12-09 | 2016-12-09 | 필름 외장 전지의 제조 방법 및 필름 외장 전지 |
JP2018555409A JP6678768B2 (ja) | 2016-12-09 | 2016-12-09 | フィルム外装電池の製造方法およびフィルム外装電池 |
EP16923255.0A EP3553842A4 (en) | 2016-12-09 | 2016-12-09 | MANUFACTURE OF FILM-COATED BATTERY AND FILM-COATED BATTERY |
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JP2018142478A (ja) * | 2017-02-28 | 2018-09-13 | オートモーティブエナジーサプライ株式会社 | 二次電池 |
JP2019008954A (ja) * | 2017-06-23 | 2019-01-17 | 日産自動車株式会社 | ヒートブロック |
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