WO2013146513A1 - 積層式電池 - Google Patents
積層式電池 Download PDFInfo
- Publication number
- WO2013146513A1 WO2013146513A1 PCT/JP2013/058014 JP2013058014W WO2013146513A1 WO 2013146513 A1 WO2013146513 A1 WO 2013146513A1 JP 2013058014 W JP2013058014 W JP 2013058014W WO 2013146513 A1 WO2013146513 A1 WO 2013146513A1
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- WIPO (PCT)
- Prior art keywords
- current collecting
- negative electrode
- positive electrode
- alignment
- collecting tab
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- 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
- H01M10/0463—Cells or batteries with horizontal or inclined electrodes
-
- 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
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
-
- 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
- H01M10/052—Li-accumulators
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a stacked battery.
- lithium ion batteries have been used not only for power sources of mobile information terminals such as mobile phones, notebook personal computers, and PDAs, but also for robots, electric vehicles, backup power sources, etc., and further increase in capacity is required. It has become like this. In response to such demands, lithium ion batteries have a high energy density and high capacity, and are therefore widely used as drive power sources as described above.
- Battery types of such lithium ion batteries can be broadly divided into a spiral type in which a spiral electrode body is enclosed in an exterior body, and a laminated electrode body in which a plurality of rectangular electrodes are laminated, and an exterior can or laminate film is welded. And a laminated type (laminated type prismatic lithium ion battery) encapsulated in a laminated outer package produced by doing so.
- the specific structure of the laminated electrode body of the laminated battery is as follows: a sheet-like positive electrode plate with a positive current collector tab extended; and a sheet-like negative electrode with a negative electrode current collector tab extended
- a configuration is such that a necessary number of plates are stacked via a separator. Further, the plurality of stacked positive electrode current collecting tabs and negative electrode current collecting tabs are converged and joined to the positive electrode current collecting terminal and the negative electrode current collecting terminal, respectively, thereby forming a current collecting portion.
- “current collector” is basically a broad concept including current collecting members such as positive and negative current collecting tabs, positive and negative current collecting terminals, and spaces around them. (In particular, when used in a narrow sense, it implies a positive and negative current collecting tab, a positive and negative current collecting terminal, and a joint portion thereof.)
- Patent Documents 1 and 2 it is proposed that the negative electrode current collecting tab is locally formed to have a small cross-sectional area in order to bend and concentrate the negative electrode current collecting tab easily. ing.
- Patent Document 1 discloses that the cross-sectional area of the current collecting tab is reduced to 5 to 90%. It is also known that when a short-circuit current flows, such a small cross-sectional area is melted to function as a fuse, thereby suppressing abnormal heat generation.
- stacking misalignment may occur when the positive electrode plate and the negative electrode plate are stacked via the separator.
- stacking misalignment occurs, the positive electrode plate and the negative electrode plate come into contact with each other and a short circuit is likely to occur.
- the edge of the opposing separator is formed so as to extend more outward than the edge of the negative electrode plate. And it is set as the structure which prevents the short circuit in a negative electrode current collection tab more fully by this. According to this configuration, even if stacking misalignment occurs at the edge on the current collector forming side, the negative electrode plate is unlikely to protrude from the separator, so that it is difficult to determine the stacking misalignment from the outside.
- an object of the present invention is to provide a stacked battery and a method of manufacturing the stacked battery that can easily detect a stacking deviation in a stacked electrode body of the stacked battery.
- the laminated battery according to the present invention is: A stacked battery including a stacked electrode body in which a positive electrode from which a positive current collecting tab extends and a negative electrode from which a negative current collecting tab extends are alternately stacked via a separator, At least one of the positive electrode current collecting tab and the negative electrode current collecting tab has a through-hole for alignment penetrating in the thickness direction, It is a position where the through-hole for alignment is not formed in the extending height position along the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab in which the through-hole for alignment is formed.
- the width in the direction perpendicular to the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab at the through-portion unformed position is 50 mm or more
- the width of the through-hole for alignment in the direction perpendicular to the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab is the positive electrode current collecting tab or the negative electrode current collecting tab at the position where the through portion is not formed. 10% or less, more preferably less than 10%, and further preferably 5% or less of the width in the direction perpendicular to the extending direction.
- the “penetrating portion” is a notch in which the edge of the positive electrode current collecting tab or the negative electrode current collecting tab is partially broken so as to form a step (width narrowing portion), the positive electrode current collecting tab Any of the openings (through holes) drilled inward from the edge of the negative electrode current collecting tab is implied.
- a separator facing the edge (hereinafter also referred to as “current collector side edge”) from which the positive electrode current collecting tab or the negative electrode current collecting tab extends in the positive electrode or the negative electrode.
- the edge of the metal plate (hereinafter also referred to as “the current collector side edge”) is shaped so as to extend largely outward, the alignment through portion and the current collector side of the separator By inspecting the presence / absence of a positional deviation between the edges, the presence / absence of a positional deviation between the positive electrode or the negative electrode and the separator can be detected easily and accurately.
- the width in the direction orthogonal to the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab at the position where the through hole is not formed is 50 mm or more, and the width of the alignment through hole is not the through hole.
- 10% or less of the width of the positive electrode current collecting tab or the negative electrode current collecting tab at the forming position more preferably less than 10%, and even more preferably 5% or less (that is, the positive electrode current collecting tab or the negative electrode current collecting sheet at the position where the through portion is not formed).
- the width obtained by subtracting the width of the through-hole for alignment from the width of the tab is 90% or more of the width of the positive electrode current collecting tab or the negative electrode current collecting tab at the position where the through-hole is not formed, more preferably larger than 90%. 95% or more), even if a through hole is formed in the positive electrode current collecting tab or the negative electrode current collecting tab, the width of the positive electrode current collecting tab or the negative electrode current collecting tab at the through hole forming position is 45 mm or more. Will be secured. It is possible to sufficiently secure the sectional area of the positive electrode current collector tab to the negative electrode current collector tab wants.
- the through-hole for alignment can be used for facilitating the bending of the current collecting tab, such as the small cross-sectional area disclosed in Patent Documents 1 and 2, or can be blown by a short-circuit current.
- the fuse is not intended to function as a fuse, the cross-sectional area at the formation position of the through portion can be increased. Thereby, it can be set as the current collection tab which does not melt
- the positive electrode current collecting tab or the negative electrode current collecting tab in which the alignment through portion is formed is bent and joined to the positive electrode current collecting terminal and the negative electrode current collecting terminal, and is located at a position closer to the laminated electrode body than the bent position. It is desirable that a through-hole for alignment is formed.
- the alignment penetrating portion is formed at a position closer to the laminated electrode body than the folding position of the current collecting tab, and therefore is clearly different from that for facilitating the folding of the current collecting tab. It has become a thing.
- the positive electrode current collecting tab or the negative electrode current collecting tab in which the alignment penetrating portion is formed be bent in advance to form a fold line (fold).
- the current collecting tab when the current collecting tab is bent and the current collecting portion is shaped, the current collecting tab is more easily and surely bent at a predetermined bending position.
- the current collecting tab is erroneously bent at the alignment through portion. Can be more effectively prevented.
- the current collecting tabs may be folded one by one, or two to five, to form a fold line (fold). Further, by performing this folding before laminating the positive electrode, the negative electrode and the separator, a folding line (fold) can be formed in advance.
- the stacked electrode body side edge in the alignment penetrating portion is at the extending height position along the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab. To ⁇ 1 mm (more preferably ⁇ 0.4 mm).
- the laminated electrode body side edge in the alignment through portion substantially coincides with the current collecting side edge of the opposing separator, and therefore the alignment through portion and the current collector of the separator are aligned.
- the presence / absence of positional deviation between the side edges can be inspected almost accurately. That is, by forming a through-hole for alignment around this, it is easy to inspect the stacking deviation in a state where the stacked electrode body is configured.
- the separator is configured in a bag shape, and the positive electrode or the negative electrode is accommodated in the bag-shaped separator.
- the positive electrode, the negative electrode, and the bag-shaped separator are rectangular, the positive electrode is accommodated in the bag-shaped separator, and the through-hole for alignment is formed in the negative electrode current collecting tab, and the negative electrode It is desirable that the three end edges excluding the current collecting side edge are arranged so as to be substantially collinear with the three end edges excluding the current collecting side edge of the bag-shaped separator.
- edge of the negative electrode is located substantially on the same line as the edge of the separator means that one edge is located within a range of about ⁇ 1 mm from the other edge.
- the configuration in which the positive electrode is accommodated in the bag-shaped separator as described above is relatively small compared to the configuration in which the negative electrode is accommodated.
- the three edges excluding the current collecting side edge of the negative electrode are arranged so as to be substantially collinear with the three edges excluding the current collecting side edge of the bag-shaped separator, that is, the negative electrode
- the negative electrode slightly differs from the bag-shaped separator when there is a stacking misalignment at this three edge. Since it sticks out, the stacking deviation can be easily detected from the outside.
- the current collecting side edge of the bag-shaped separator is particularly opposed to the current collecting side edge because the separator cannot be welded at the position of the positive electrode current collecting tab and a short circuit is likely to occur. It is desirable that the negative electrode is shaped so as to extend largely outside the current collecting side edge of the negative electrode, thereby preventing a short circuit as much as possible.
- the current collecting side edge has such a configuration, even if there is a stacking deviation, the current collecting side edge of the negative electrode does not protrude from the current collecting side edge of the bag-shaped separator, and thus the stacking misalignment is difficult to detect. Therefore, as described above, by forming a through-hole for alignment in the negative electrode current collector tab, it is possible to easily detect the presence or absence of stacking misalignment even at the current collector side edge.
- the thickness of the positive electrode current collector tab or the negative electrode current collector tab in which the alignment penetrating portion is formed is 0.03 mm or less.
- the current collecting tab can be easily bent, and the current collecting portion can be easily formed.
- a stacked battery having a high energy density can be obtained.
- the member cost can be reduced.
- the positive electrode current collecting tab or the negative electrode current collecting tab in which the alignment penetrating portion is formed it is desirable that those of the same polarity are arranged at positions overlapping in plan view.
- the laminated battery according to the present invention is A stacked battery including a stacked electrode body in which a positive electrode from which a positive current collecting tab extends and a negative electrode from which a negative current collecting tab extends are alternately stacked via a separator, At least one of the positive electrode and the negative electrode is formed with an alignment extension piece partially extending from an edge.
- the alignment is performed even when the edge of the separator facing the positive electrode or the negative electrode is formed so as to extend largely outward.
- the presence or absence of misalignment between the positive electrode or the negative electrode and the separator can be detected easily and accurately by examining the presence or absence of misalignment between the extension piece for use and the edge of the separator. Can do.
- the alignment extension piece is formed on the current collecting side edge of at least one of the positive electrode and the negative electrode.
- the extension piece for alignment may be formed on any edge of the positive electrode or the negative electrode, but as described above, it faces the edge of the positive electrode or the negative electrode except for the current collecting side edge.
- the tip of the alignment extension piece is ⁇ 1 mm (more preferably ⁇ 0.4 mm) from the edge of the opposing separator at the extension height position along the extension direction of the extension piece. It is desirable to be formed so as to be within the range.
- the leading end of the alignment extension piece substantially coincides with the edge of the opposing separator, and therefore the position between the alignment extension piece and the separator edge.
- the presence or absence of misalignment can be inspected almost accurately. That is, by forming the alignment extension piece so that the tip comes around here, it is easy to inspect the misalignment in a state where the laminated electrode body is configured.
- the width in the direction perpendicular to the extending direction of the extending piece for alignment is desirably 1 to 10 mm.
- the width in the direction orthogonal to the extending direction of the extending piece for alignment is 1 mm or more, it is easy to detect whether there is a positional deviation between the edge of the opposing separator, and On the other hand, if it is 10 mm or less, the extension piece has a width that is not unnecessarily large, and as a result, a portion that is likely to cause a short circuit like the current collecting tab. Can be suppressed as much as possible.
- the separator is configured in a bag shape, and the positive electrode or the negative electrode is accommodated in the bag-shaped separator.
- the positive electrode, the negative electrode, and the bag-shaped separator are rectangular, the positive electrode is accommodated in the bag-shaped separator, and the extension piece for alignment is formed on the current collecting side edge of the negative electrode It is desirable that the three end edges excluding the current collecting side edge of the negative electrode are arranged so as to be substantially collinear with the three end edges excluding the current collecting side edge of the bag-shaped separator. .
- the configuration in which the positive electrode is accommodated in the bag-shaped separator as described above is relatively small compared to the configuration in which the negative electrode is accommodated.
- the three edges excluding the current collecting side edge of the negative electrode are arranged so as to be substantially collinear with the three edges excluding the current collecting side edge of the bag-shaped separator, that is, the negative electrode
- the negative electrode slightly differs from the bag-shaped separator when there is a stacking misalignment at this three edge. Since it sticks out, it is possible to easily detect the stacking error.
- the current collecting side edge of the bag-shaped separator is particularly opposed to the current collecting side edge because the separator cannot be welded at the position of the positive electrode current collecting tab and a short circuit is likely to occur. It is desirable that the negative electrode is shaped so as to extend largely outside the current collecting side edge of the negative electrode, thereby preventing a short circuit as much as possible.
- the current collecting side edge has such a configuration, even if there is a stacking deviation, the current collecting side edge of the negative electrode does not protrude from the current collecting side edge of the bag-shaped separator, and thus the stacking misalignment is difficult to detect. Therefore, by forming the alignment extension piece on the current collecting side edge of the negative electrode as described above, it is possible to easily detect the presence or absence of stacking misalignment also on the current collecting side edge.
- the thickness of the alignment piece for alignment is 0.03 mm or less.
- the alignment extending pieces in the same polarity among the laminated positive electrode or negative electrode are arranged at positions where they overlap each other in plan view.
- a method for manufacturing a stacked battery according to the present invention includes: A method for producing a laminated battery comprising a laminated electrode body production step of producing a laminated electrode body by alternately laminating a positive electrode from which a positive electrode current collecting tab extends and a negative electrode from which a negative electrode current collecting tab extends through a separator. And At least one of the positive electrode current collecting tab and the negative electrode current collecting tab is formed with a through-hole for alignment that penetrates in the thickness direction; It is a position where the through-hole for alignment is not formed in the extending height position along the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab in which the through-hole for alignment is formed.
- the width in the direction perpendicular to the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab at the through-portion unformed position is 50 mm or more
- the width of the through-hole for alignment in the direction perpendicular to the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab is the positive electrode current collecting tab or the negative electrode current collecting tab at the position where the through portion is not formed.
- 10% or less of the width in the direction perpendicular to the extending direction more preferably less than 10%, and even more preferably 5% or less, It is characterized in that the presence or absence of misalignment between the edge of the positive electrode or the negative electrode and the edge of the separator is inspected at the alignment penetrating portion.
- the collector side edge of the separator opposite to the collector side edge of the positive electrode or the negative electrode is shaped so as to extend greatly outward. Even if it exists, the presence or absence of misalignment between the positive electrode or the negative electrode and the separator can be easily determined by inspecting the misalignment between the through-hole for alignment and the current collecting side edge of the separator. It can be detected with high accuracy.
- the width in the direction orthogonal to the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab at the position where the through hole is not formed is 50 mm or more, and the width of the alignment through hole is not the through hole.
- 10% or less of the width of the positive electrode current collecting tab or the negative electrode current collecting tab at the forming position more preferably less than 10%, and even more preferably 5% or less (that is, the positive electrode current collecting tab or the negative electrode current collecting sheet at the position where the through portion is not formed).
- the width obtained by subtracting the width of the through-hole for alignment from the width of the tab is 90% or more of the width of the positive electrode current collecting tab or the negative electrode current collecting tab at the position where the through-hole is not formed, more preferably larger than 90%. 95% or more), even if a through hole is formed in the positive electrode current collecting tab or the negative electrode current collecting tab, the width of the positive electrode current collecting tab or the negative electrode current collecting tab at the through hole forming position is 45 mm or more. Will be secured. It is possible to sufficiently secure the sectional area of the positive electrode current collector tab to the negative electrode current collector tab wants.
- the through-hole for alignment can be used for facilitating the bending of the current collecting tab, such as the small cross-sectional area disclosed in Patent Documents 1 and 2, or can be blown by a short-circuit current. Since it is not intended to function as a fuse to be used, a current collecting tab that does not melt at the through-hole forming position even when a large current is passed by increasing the cross-sectional area at the through-hole forming position. Can do. Therefore, it is also possible to configure a stacked battery including a large stacked electrode body that can be charged and discharged with a large current.
- “completion of the laminated electrode body” does not include a step of focusing the positive electrode current collecting tab and the negative electrode current collecting tab of the laminated electrode body and connecting them to the positive electrode current collecting terminal and the negative electrode current collecting terminal, respectively. To do.
- the inspection for the presence or absence of the positional deviation is performed by detecting the alignment penetrating portion with a laser from one side or the other side.
- the positive electrode current collecting tab or the negative electrode current collecting tab in which the alignment through portion is formed is bent and joined to the positive electrode current collecting terminal and the negative electrode current collecting terminal, and is located at a position closer to the laminated electrode body than the bent position. It is desirable that a through-hole for alignment is formed.
- the alignment penetrating portion is formed at a position closer to the laminated electrode body than the folding position of the current collecting tab, and therefore is clearly different from that for facilitating the folding of the current collecting tab. It has become a thing.
- a fold line be formed in advance on the positive electrode current collecting tab or the negative electrode current collecting tab in which the alignment penetrating portion is formed.
- the current collecting tab when the current collecting tab is bent to shape the current collecting portion, the current collecting tab can be easily and surely bent at a predetermined bending position, for example, it may be mistakenly bent at the alignment through portion. Can be more effectively prevented.
- the current collecting tabs may be folded one by one, or two to five, to form a fold line (fold). Further, by performing this folding before laminating the positive electrode, the negative electrode and the separator, a folding line (fold) can be formed in advance.
- the stacked electrode body side edge in the alignment penetrating portion is disposed at the height-extended position along the extending direction of the positive electrode current collecting tab or the negative electrode current collecting tab. To ⁇ 1 mm (more preferably ⁇ 0.4 mm).
- the laminated electrode body side edge in the alignment through portion can be substantially matched with the current collecting side edge of the opposing separator.
- the presence / absence of a positional deviation from the electrical side edge can be inspected almost accurately. That is, by forming a through-hole for alignment around this, it is easy to inspect the stacking deviation in a state where the stacked electrode body is configured.
- the separator is formed in a bag shape, and the positive electrode or the negative electrode is accommodated in the bag-shaped separator.
- the positive electrode, the negative electrode, and the bag-shaped separator into a square shape, housing the positive electrode in the bag-shaped separator, forming the alignment through-hole in the negative electrode current collecting tab, It is desirable that the three end edges excluding the current collecting side edge of the negative electrode be disposed substantially on the same line as the three end edges excluding the current collecting side edge of the bag-shaped separator.
- edge of the negative electrode is located substantially on the same line as the edge of the separator means that one edge is located within a range of about ⁇ 1 mm from the other edge.
- the configuration in which the positive electrode is accommodated in the bag-shaped separator as described above is relatively small compared to the configuration in which the negative electrode is accommodated.
- the three edges excluding the current collecting side edge of the negative electrode are arranged so as to be substantially collinear with the three edges excluding the current collecting side edge of the bag-shaped separator, that is, the negative electrode
- the negative electrode slightly differs from the bag-shaped separator when there is a stacking misalignment at this three edge. Since it sticks out, it is possible to easily detect the stacking error.
- the current collecting side edge of the bag-shaped separator is particularly opposed to the current collecting side edge because the separator cannot be welded at the position of the positive electrode current collecting tab and a short circuit is likely to occur. It is desirable that the negative electrode is shaped so as to extend largely outside the current collecting side edge of the negative electrode, thereby preventing a short circuit as much as possible.
- the current collecting side edge has such a configuration, even if there is a stacking deviation, the current collecting side edge of the negative electrode does not protrude from the current collecting side edge of the bag-shaped separator, and thus the stacking misalignment is difficult to detect. Therefore, as described above, by forming a through-hole for alignment in the negative electrode current collector tab, it is possible to easily detect the presence or absence of stacking misalignment even at the current collector side edge.
- the thickness of the positive electrode current collector tab or the negative electrode current collector tab in which the alignment penetrating portion is formed is 0.03 mm or less.
- the current collecting tab can be easily bent, and the current collecting portion can be easily formed.
- a stacked battery having a high energy density can be obtained.
- the member cost can be reduced.
- the positive electrode current collecting tab or the negative electrode current collecting tab in which the alignment penetrating portion is formed it is desirable to arrange the same polarity ones at positions overlapping each other in plan view.
- a method for manufacturing a stacked battery according to the present invention includes: A method for producing a laminated battery comprising a laminated electrode body production step of producing a laminated electrode body by alternately laminating a positive electrode from which a positive electrode current collecting tab extends and a negative electrode from which a negative electrode current collecting tab extends through a separator. And At least one of the positive electrode and the negative electrode is formed with an extension piece for alignment partially extending from an edge, It is characterized by inspecting the presence or absence of misalignment between the edge of the positive electrode or the negative electrode and the edge of the separator with the extension piece for alignment.
- the alignment is performed even when the edge of the separator facing the positive electrode or the negative electrode is formed so as to extend largely outward.
- the alignment is performed even when the edge of the separator facing the positive electrode or the negative electrode is formed so as to extend largely outward.
- the inspection for the presence or absence of the positional deviation is performed by detecting the alignment extension piece with a laser from one side or the other side.
- the extension piece for alignment may be formed on any edge of the positive electrode or the negative electrode.
- the current collecting side edge of the separator on the current collecting side edge is outside. If there is a stacking misalignment, it is difficult to detect any misalignment. Therefore, it is possible to detect the misalignment easily and accurately by forming an extension piece for alignment. it can.
- the tip of the extension piece for alignment is ⁇ 1 mm (more preferably ⁇ 0.4 mm) from the edge of the opposing separator at the extension height position along the extension direction of the extension piece. It is desirable to form so as to be within the range.
- the leading end of the alignment extension piece can be substantially coincident with the edge of the opposing separator, and therefore, the alignment extension piece and the edge of the separator are disposed between each other.
- the presence or absence of positional deviation can be inspected almost accurately. That is, by forming the alignment extension piece so that the tip comes around here, it is easy to inspect the misalignment in a state where the laminated electrode body is configured.
- the width in the direction perpendicular to the extending direction of the extending piece for alignment is desirably 1 to 10 mm.
- the width in the direction orthogonal to the extending direction of the extending piece for alignment is 1 mm or more, it is easy to detect whether there is a positional deviation between the edge of the opposing separator, and On the other hand, if it is 10 mm or less, the extension piece has a width that is not unnecessarily large, and as a result, a portion that is likely to cause a short circuit like the current collecting tab. Can be suppressed as much as possible.
- the separator is formed in a bag shape, and the positive electrode or the negative electrode is accommodated in the bag-shaped separator.
- the positive electrode, the negative electrode, and the bag-shaped separator are formed into a square shape, the positive electrode is accommodated in the bag-shaped separator, and the alignment extension piece is disposed on the current collecting side edge of the negative electrode. It is desirable to form and arrange so that the three edges excluding the current collecting side edge of the negative electrode are located substantially on the same line as the three edges excluding the current collecting side edge of the bag-shaped separator.
- the configuration in which the positive electrode is accommodated in the bag-shaped separator as described above is relatively small compared to the configuration in which the negative electrode is accommodated.
- the three edges excluding the current collecting side edge of the negative electrode are arranged so as to be substantially collinear with the three edges excluding the current collecting side edge of the bag-shaped separator, that is, the negative electrode
- the negative electrode slightly differs from the bag-shaped separator when there is a stacking misalignment at this three edge. Since it sticks out, the stacking deviation can be easily detected from the outside.
- the current collecting side edge of the bag-shaped separator is particularly opposed to the current collecting side edge because the separator cannot be welded at the position of the positive electrode current collecting tab and a short circuit is likely to occur. It is desirable that the negative electrode is shaped so as to extend largely outside the current collecting side edge of the negative electrode, thereby preventing a short circuit as much as possible.
- the current collecting side edge has such a configuration, even if there is a stacking deviation, the current collecting side edge of the negative electrode does not protrude from the current collecting side edge of the bag-shaped separator, and thus the stacking misalignment is difficult to detect. Therefore, by forming the alignment extension piece on the current collecting side edge of the negative electrode as described above, it is possible to easily detect the presence or absence of stacking misalignment also on the current collecting side edge.
- the thickness of the alignment piece for alignment is 0.03 mm or less.
- the extended pieces for alignment in the same polarity in a position overlapping in plan view.
- the present invention it is possible to easily detect the stacking deviation in the stacked electrode body of the stacked battery.
- the figure (a) is a top view of a positive electrode
- the figure (b) is a perspective view of a separator
- the figure (c) is a positive electrode arrange
- a negative electrode mixture slurry was prepared by mixing 98% by mass of graphite as a negative electrode active material, 1% by mass of carboxymethyl cellulose (CMC), 1% by mass of styrene butadiene rubber (SBR), and water.
- the negative electrode plate 2 having the negative electrode active material layer 2a on both surfaces was produced.
- the width L9 60 mm from the end (the right end of the upper side in FIG. 2) on the side opposite to the positive electrode current collecting tab 11 forming side end of the positive electrode plate 1 on one side extending in the width direction of the negative electrode plate 2.
- An active material uncoated portion having a length of L10 20 mm was extended to form a negative electrode current collecting tab 12.
- the plurality (19 sheets) of the bag-like separators 3 and the plurality (20 sheets) of the negative electrode plates 2 were alternately laminated.
- the positive electrode current collecting tabs 11 and the negative electrode current collecting tabs 12 were arranged at positions overlapping each other in plan view.
- the negative electrode plate 2 was positioned at both ends in the stacking direction, and the insulating sheets 5 made of polypropylene (PP) having the same dimensions and the same shape as the separator 3a were respectively arranged on both outer sides thereof.
- PP polypropylene
- the laminated electrode body 10 is laid down so that the bending direction of the tip end portions of the positive and negative current collecting tabs 11 and 12 is directed downward, and from above at a detection position C11 shown in FIG.
- the current collecting side edges of the positive electrode plate 1 and the negative electrode plate 2 are detected.
- the presence or absence of misalignment between the bag-like separator 3 and the current collecting side edge was detected.
- whether or not the edge of the negative electrode plate 2 protrudes from the edge of the bag-like separator 3 is inspected by a laser.
- FIG. 6 which schematically shows the following description and the situation after the shaping / connecting process of the current collector, the positive electrode side (the positive current collector tab 11 and the positive current collector terminal 15 are basically arranged. ), The same is done on the negative electrode side at the same time.
- the laminated electrode body 10 is in a horizontal position similar to that in the case of the above-described inspection, and the laminated positive electrode current collecting tab 11 is placed on the bending direction side (lower side) of the distal end portion which is one side in the laminating direction of the laminated electrode body 10. It was focused as if it were close. Subsequently, the excessive part in the site
- the positive electrode current collector tab 11 and the negative electrode current collector tab 12 are provided with a positive electrode current collector terminal 15 made of an aluminum plate having a width of 60 mm and a thickness of 0.4 mm and a negative electrode current collector made of a copper plate having a width of 60 mm and a thickness of 0.4 mm. Terminal 16 was joined.
- FIG. 1 A positive electrode current collector terminal 15 made of an aluminum plate having a width of 60 mm and a thickness of 0.4 mm and a negative electrode current collector made of a copper plate having a width of 60 mm and a thickness of 0.4 mm. Terminal 16 was joined.
- FIG. 6 shows a state after the portion extending from the converging portion B11 of the positive electrode current collecting tab 11 to the tip side is bent in the fifth step described later, but in the stage up to the fourth step described later.
- the portion of the positive electrode current collecting tab 11 extending from the converging part B11 to the tip side is in a state of extending straight in the extending direction of the positive electrode current collecting tab 11, that is, rightward in FIG.
- Reference numerals 15S and 16S shown in FIG. 6, FIG. 7 and other drawings indicate widths on the positive and negative electrode current collecting terminals 15 and 16 to ensure hermeticity when heat-sealing an outer package 18 described later.
- a resin sealing material glue material molded so as to be fixed in a band shape along the direction is indicated.
- a side surface (upper side surface) of the positive electrode current collecting tab 11 which is one side surface in a joint portion (hereinafter also referred to as “positive electrode current collecting joint portion”) F11 between the positive electrode current collecting tab 11 and the positive electrode current collecting terminal 15.
- a 61 mm ⁇ 10 mm ⁇ 35 ⁇ m thick polyimide insulating tape is attached to the left side in FIG. 6 to form the inner insulating layer 44N, and the side of the positive current collector terminal 15 that is the other side (lower side; right side in FIG. 6) 61 mm ⁇ 10 mm ⁇ 70 ⁇ m thick polyimide insulating tape was attached to the surface) to form an outer insulating layer 44E.
- the insulating tape of the inner insulating layer 44N is pasted so as to cover from the vicinity of the converging portion B11 of the positive electrode current collecting tab 11 to slightly outside the tip, and the positive and negative electrode plates 1, 2 in the insulating tape of the outer insulating layer 44E.
- the side (the base end portion side of the positive electrode lead 11) is attached so as to slightly overlap the tip edge portion of one side surface (that is, the lower surface of the lower insulating sheet 5 in FIG. 6) in the stacking direction of the stacked electrode body 10,
- the current collector draw-out side was attached so as to overlap the positive electrode current collector terminal 15 and the end of the resin sealing material (glue material) 15S.
- the metal part of the side surface (upper side surface) of the positive electrode current collecting tab 11 which is one side surface in the positive electrode current collecting joint portion F11 is almost entirely covered with the inner insulating layer 44N. Further, the side surface (lower side surface) of the positive electrode current collector terminal 15 which is the other side surface is between the insulating sheet 5 of the laminated electrode body 10 and the resin sealing material (glue material) 15S of the positive electrode current collector terminal 15 by the outer insulating layer 44E. The entire surface was covered so that the metal part was not exposed.
- the positive and negative electrode plates 1, 2 are more positive than the positive electrode current collector joint portion F 11 so that the positive electrode current collector joint portion F 11 is substantially parallel to the lamination direction (vertical direction in FIG. 6) of the laminated electrode body 10.
- the side portion base end portion of the positive electrode current collecting tab 11
- it was bent inward (upward in FIG. 6) as indicated by an arrow A11.
- an insulating tape 46 made of polyimide having a size of 61 mm ⁇ 6 mm ⁇ thickness 35 ⁇ m is placed between the positive electrode current collector terminal 15 and the laminated electrode body 10 in the direction toward the front end of the positive electrode current collector junction F11 (in FIG.
- the positive electrode current collecting tab 11 was held in a predetermined bent state and positioned.
- the current collecting part is effectively saved in space.
- the laminated electrode body 10 is inserted into an exterior body 18 composed of a laminate film 17 formed so that the electrode body can be installed in advance, and the positive electrode current collector terminal 15 and the negative electrode current collector terminal 16 are externally provided.
- One side excluding the side where the positive electrode current collector terminal 15 and the negative electrode current collector terminal 16 are located was left so as to protrude from the body 18 to the outside, and heat fusion was performed.
- LiPF 6 is 1M (moles) in a mixed solvent in which ethylene carbonate (EC) and methyl ethyl carbonate (MEC) are mixed at a volume ratio of 30:70 from one side where the outer package 18 is not thermally welded.
- the electrolytic solution dissolved at a rate of 1 / liter) was injected.
- one side of the exterior body 18 that was not thermally welded was thermally welded to produce a battery A1.
- a positive electrode plate 30 was produced in the same manner as in the case of the positive electrode plate 1 in the battery A1 of the first embodiment except that the notched through portion 31S was formed.
- a negative electrode plate 40 was produced in the same manner as in the case of the negative electrode plate 2 in the battery A1 of the first embodiment except that the notch-shaped through portion 41S was formed.
- a laminated electrode body was produced in the same manner as in the laminated electrode body 10 in the battery A1 of the first embodiment except that the positive electrode plate 30 and the negative electrode plate 40 were used (not shown). The presence or absence was inspected in the same manner as in the first embodiment.
- the base end side edge 41 ⁇ / b> C of the penetrating portion 41 ⁇ / b> S in the negative electrode current collecting tab 41 is displaced so as to protrude by a slight distance L ⁇ b> 25 outside the current collecting side end edge 3 ⁇ / b> C of the bag-like separator 3.
- the distance L25 displaced outward is less than 1 mm (or less than 0.4 mm)
- the base end side edge of the through portions 31S and 41S in the positive electrode current collecting tab 31 or the negative electrode current collecting tab 41 is 1 mm or more (or 0.4 mm) outside the current collecting side edge 3C of the bag-like separator 3. If it is detected that there is a protrusion, it is determined that there is a positional shift at the current collecting side edge.
- the base end side edge 41 ⁇ / b> C of the penetrating portion 41 ⁇ / b> S in the negative electrode current collection tab 41 is slightly inside the current collection side edge 3 ⁇ / b> C of the bag-like separator 3.
- the other distance parallel to the current collecting side edge of the negative electrode plate 40 (depending on the size of the distance L26 shifted inwardly) is obtained. What is necessary is just to test
- the other (opposite) edge parallel to the current collecting side edge of the positive electrode plate 30 is housed inside the opposite edge of the bag-like separator 3, Since the end edge is almost entirely thermally welded and sealed at the fusion part 4, the positive electrode plate 30 does not protrude outward from the end edge of the bag-like separator 3. It is considered that there is almost no need to inspect whether the positive electrode plate 30 is misaligned.
- a battery A2 was produced in the same manner as the battery A1 of the first embodiment except that the laminated electrode body produced and inspected as described above was used.
- the alignment penetrating portions 31S and 41S in the battery A2 of the second embodiment may function substantially the same as the alignment penetrating portions 11S and 12S in the battery A1 of the first embodiment. it can.
- the positive and negative electrode current collecting tabs 31, 41 has a shape that protrudes inward in the width direction, and there is a tendency that this protruding portion tends to be an obstacle.
- this protruding portion is likely to cause current flow in the positive and negative current collecting tabs 31 and 41.
- a larger area of a portion that can be a path is secured.
- a positive electrode plate 50 was produced in the same manner as in the case of the plate 30.
- a negative electrode plate 60 was produced in the same manner as for the plate 2.
- a laminated electrode body is produced in the same manner as the laminated electrode body in the battery A2 of the second embodiment except that the positive electrode plate 50 and the negative electrode plate 60 are used (not shown), and the alignment extending piece 51P is used. , 61P was used, and the presence or absence of stacking misalignment in the stacked electrode body was examined in the same manner as in the stacked electrode body in the battery A2 of the second embodiment.
- a battery A3 was produced in the same manner as the battery A2 of the second embodiment except that the laminated electrode body produced and inspected as described above was used.
- the alignment extending pieces 51P and 61P in the battery A3 of the third embodiment are positioned at the through-holes 11S and 12S for alignment in the battery A1 of the first embodiment or the battery A2 of the second embodiment. It can function almost the same as the through-holes 31S and 41S for alignment.
- the extension pieces 51P and 61P for alignment are positive and negative as compared with the configuration of the battery A1 of the first embodiment or the battery A2 of the second embodiment. Since the current collector tabs 51 and 61 are configured to extend independently from the positive and negative electrode plates 50 and 60 separately, the positive and negative current collector tabs 51 and 61 are formed in a rectangular shape without being partially lost. There is an advantage that you can.
- the alignment through portions 11S, 12S, 31S, 41S and the alignment extending pieces 51P, 61P are the positive plates 1, 30, 50 and the negative plate.
- the alignment penetrating part or the alignment extension piece may be formed only on one of the positive electrode and the negative electrode.
- it is desirable to form both the positive electrode and the negative electrode because it is possible to more thoroughly inspect the presence of misalignment.
- the alignment extending pieces 51P and 61P are formed on the current collecting side edges of the positive electrode plate 50 and the negative electrode plate 60, respectively. May be formed on the edge of the positive and negative electrode plates other than the current collecting side edge.
- the presence or absence of misalignment at the edge can be easily detected by forming it so as to be aligned with the edge of the corresponding separator.
- the electrode plate positive electrode plate or negative electrode plate
- the through-holes 11S, 12S, 31S, 41S for alignment are stepped at the edges of the positive and negative current collecting tabs 11, 12, 31, 41.
- a current collecting tab (a positive current collecting tab or a negative current collecting tab) is used. It is good also as an opening (through-hole) drilled inside 71 edge.
- the current collecting tab 71 has a rectangular shape, and the current collecting tab starts from the inner edge portion (the right edge portion in FIG. 15) of both side edge portions extending in the extending height direction of the current collecting tab 71.
- the base side edge of the penetrating part 71S is the same as the case of the penetrating parts 11S, 12S, 31S, and 41S that are notched in the first and second embodiments.
- the stacking deviation can be inspected.
- the through portions 11S, 12S, 31S, and 41S that are notches in the first and second embodiments there is an advantage that the vicinity of the formation position of the through portion 71S is less likely to be damaged, but the ease of formation There is a tendency to be slightly inferior in terms of (workability).
- the inspection of the stacking deviation of the stacked electrode body 10 is performed by connecting and fixing the stacked electrode body 10 with the insulating tape 26, and shaping and connecting the current collector.
- the insulating tape It may be performed in a stage before fixing with a fixing means such as. In other words, it is difficult to correct the misalignment after entering the current shaping / connecting process of the current collector, but if it is in the previous stage, the misalignment of the stack will be at any one or more times. Inspection can be performed.
- the stacking misalignment may be inspected even after the current collector shaping / connecting process is started.
- the presence or absence of a positional shift at the current collecting side edge of the accommodated electrode plate may be inspected.
- the exterior body 18 composed of the laminate film 17 is used as the exterior body.
- any exterior body other than the laminate exterior body is used.
- a battery can etc. can also be used.
- a laminate outer body for example, if the positive and negative electrode plates protrude from the separator, there is a risk of causing a short circuit by breaking through the insulating layer of the laminate outer body and contacting the metal layer.
- the effect of the present invention in which such protrusions of the positive and negative electrode plates can be easily detected by the alignment penetrating part or the extending piece is exhibited.
- laminate material for example, Aluminum, aluminum alloy, stainless steel, etc. as the metal layer Polyethylene, polypropylene, etc. as the inner layer (inside the battery) Nylon, polyethylene terephthalate (PET), PET / nylon laminated film, etc. as the outer layer (battery outer side) What is comprised using each is mentioned.
- the positive electrode active material is not limited to the above-described lithium cobaltate, and lithium composite oxide containing cobalt, nickel, or manganese such as cobalt-nickel-manganese, aluminum-nickel-manganese, aluminum-nickel-cobalt, etc. Or a spinel type lithium manganate may be used.
- a negative electrode active material in addition to graphite such as natural graphite and artificial graphite, graphite, coke, tin oxide, metal lithium, silicon, and a mixture thereof can be used to insert and desorb lithium ions. It doesn't matter.
- the concentration of the supporting salt is not particularly limited, but is preferably 0.8 to 1.8 mol per liter of the electrolyte.
- the solvent species include carbonate solvents such as propylene carbonate (PC), ⁇ -butyrolactone (GBL), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), and diethyl carbonate (DEC). More preferably, a combination of a cyclic carbonate and a chain carbonate is desirable.
- PC propylene carbonate
- GBL ⁇ -butyrolactone
- EMC ethyl methyl carbonate
- DMC dimethyl carbonate
- DEC diethyl carbonate
- DEC diethyl carbonate
- the present invention can be applied to a wide range of applications, and is particularly suitable as a power source for high output applications such as power mounted on a robot or an electric vehicle, a backup power source, etc. Can be applied to.
- Positive electrode 11 Positive electrode current collecting tab
- Positioning penetration part 3 Bag-shaped separator 3a: Separator
- L3 Width of positive electrode current collection tab at a position where no penetration part is formed
- L12 Width of alignment penetration part
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Description
正極集電タブが延出する正極と負極集電タブが延出する負極とがセパレータを介して交互に積層された積層電極体を備える積層式電池であって、
前記正極集電タブおよび前記負極集電タブのうちの少なくとも一方に、厚さ方向に貫通する位置合せ用の貫通部が形成され、
前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブの延出方向に沿った延出高さ位置において前記位置合せ用の貫通部が形成されていない位置である貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が50mm以上であり、
前記位置合せ用の貫通部の、前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が、前記貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅の10%以下、より好適には10%未満、さらに好適には5%以下であることを特徴とする。
なおこの場合、集電タブは1枚ずつ、あるいは2~5枚ずつ折り曲げて折り曲げ線(折り目)を形成すればよい。また、この折り曲げは、正極、負極およびセパレータを積層する前に行うことで、予め折り曲げ線(折り目)を形成することができる。
正極集電タブが延出する正極と負極集電タブが延出する負極とがセパレータを介して交互に積層された積層電極体を備える積層式電池であって、
前記正極および前記負極のうちの少なくとも一方に、端縁から部分的に延出する位置合せ用の延出片が形成されていることを特徴とする。
正極集電タブが延出する正極と負極集電タブが延出する負極とをセパレータを介し交互に積層して積層電極体を作製する積層電極体作製工程を有する積層式電池の製造方法であって、
前記正極集電タブおよび前記負極集電タブのうちの少なくとも一方に、厚さ方向に貫通する位置合せ用の貫通部を形成し、
前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブの延出方向に沿った延出高さ位置において前記位置合せ用の貫通部が形成されていない位置である貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が50mm以上であり、
前記位置合せ用の貫通部の、前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が、前記貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅の10%以下、より好適には10%未満、さらに好適には5%以下であり、
前記位置合せ用の貫通部で前記正極または前記負極の端縁と前記セパレータの端縁との間の位置ズレの有無を検査するようにすることを特徴とする。
なおこの場合、集電タブは1枚ずつ、あるいは2~5枚ずつ折り曲げて折り曲げ線(折り目)を形成すればよい。また、この折り曲げは、正極、負極およびセパレータを積層する前に行うことで、予め折り曲げ線(折り目)を形成することができる。
正極集電タブが延出する正極と負極集電タブが延出する負極とをセパレータを介し交互に積層して積層電極体を作製する積層電極体作製工程を有する積層式電池の製造方法であって、
前記正極および前記負極のうちの少なくとも一方に、端縁から部分的に延出する位置合せ用の延出片を形成し、
前記位置合せ用の延出片で前記正極または前記負極の端縁と前記セパレータの端縁との間の位置ズレの有無を検査するようにすることを特徴とする。
宜変更して実施することが可能なものである。
〔正極の作製〕
正極活物質としてのLiCoO2を90質量%と、導電剤としてのカーボンブラックを5質量%と、結着剤としてのポリフッ化ビニリデンを5質量%と、溶剤としてのN-メチル-2-ピロリドン(NMP)溶液とを混合して正極用スラリーを調製した。この正極用スラリーを、正極集電体としてのアルミニウム箔(厚み:15μm)の両面に塗布した。その後、加熱することにより溶剤を除去し、ローラーで厚み0.1mmにまで圧縮した後、図1(a)に示すように、幅L1=174mm、高さL2=174mmになるように切断して、両面に正極活物質層1aを有する正極板1を作製した。この際、正極板1における幅L1方向に延びる一辺の一方端部(図1(a)では上辺の左端部)から幅L3=60mm、高さL4=20mmの活物質未塗布部を延出させて正極集電タブ11とした。
負極活物質としての黒鉛を98質量%と、カルボキシメチルセルロース(CMC)を1質量%と、スチレンブタジエンゴム(SBR)を1質量%と、水とを混合することにより負極合剤スラリーを調製した。この負極用スラリーを負極集電体としての銅箔(厚み:10μm)の両面に塗布した。その後、加熱することにより溶剤として用いた水を除去し、ローラーで厚み0.08mmにまで圧縮した後、図2に示すように、幅L7=180mm、高さL8=180mmになるように切断して、両面に負極活物質層2aを有する負極板2を作製した。この際、負極板2の幅方向に延びる一辺において上記正極板1の正極集電タブ11形成側端部と反対側となる端部(図2では上辺の右端部)から幅L9=60mm、高さL10=20mmの活物質未塗布部を延出させて負極集電タブ12とした。
図1(b)に示すように、幅L5=180mmおよび高さL6=182mmを有する2枚の方形状のポリプロピレン(PP)製のセパレータ3a(厚み30μm)の間に正極板1を配置した後、図1(c)に示すように、セパレータ3aの全周縁部における正極集電タブ11が突出する部分以外の部分を融着部4で熱溶着して、正極板1が内部に収納・配置された袋状セパレータ3を作製した。
上記正極板1が内部に配置された袋状セパレータ3を19枚、負極板2を20枚調製し、図1(c)および図2に示すように、正負極集電タブ11、12(正極集電タブ11および負極集電タブ12)をそれぞれ数枚(5枚程度)ずつ重ねて貫通部11S、12Sの基端側端(正負極活物質層1a、2a側端;図1(c)および図2では下端)よりも0.4mmだけ先端側の位置で、この位置よりも先端側に延出する部分を、一方面側(図1(c)および図2では手前側又は奥側)へ折り曲げ、これにより、正負極集電タブ11、12の延出方向に直交する方向に沿って延びる折り曲げ線11F、12Fをそれぞれ形成した。
ついで、以下の手順に従い、図6に示すように、上記積層電極体10における正負極集電タブ11、12の整形(集束、切断、折り曲げ等)および正負極集電端子(正極集電端子および負極集電端子)15、16との接続を行った。なお、以下の記述、ならびにこの集電部の整形・接続工程が終了した後の状況を摸式的に示す図6においては、基本的に正極側(正極集電タブ11および正極集電端子15)の場合を示すが、これと同時に負極側においても同様に行っている。
積層電極体10を上述の検査の場合と同様の横臥体勢とし、積層された正極集電タブ11を、積層電極体10の積層方向における一方側である先端部の折り曲げ方向側(下側)に寄せるようにして集束した。ついで、この正極集電タブ11の集束部B11から先端側へ延びる部位における余剰部を切断して先端を揃えた。
ついで、正極集電タブ11の集束部B11から先端側へ延びる部位に下方から正極集電端子15の一方端部を重ねるように配置し、この状態で超音波溶接を行い、図7に示すように、正極集電タブ11および負極集電タブ12の先端部に、幅60mm、厚み0.4mmのアルミニウム板よりなる正極集電端子15ならびに幅60mm、厚み0.4mmの銅板よりなる負極集電端子16を接合した。なお、図6では、後述の第5ステップで正極集電タブ11の集束部B11から先端側へ延びる部位が折り曲げられた後の状況が示されているが、後述の第4ステップまでの段階では、正極集電タブ11の集束部B11から先端側へ延びる部位は正極集電タブ11の延出方向すなわち図6では右方へ真っ直ぐに延出した状況となっている。
図6に示すように、正極集電タブ11と正極集電端子15との接合部(以下、「正極集電接合部」とも称す)F11における一方側面である正極集電タブ11側面(上側面;図6では左側面)に61mm×10mm×厚み35μmのポリイミド製の絶縁テープを付着して内側絶縁層44Nを形成し、他方側面である正極集電端子15側面(下側面;図6では右側面)に61mm× 10 mm×厚み70μmのポリイミド製の絶縁テープを付着して外側絶縁層44Eを形成した。
ついで、正極集電端子15において正極集電接合部F11よりも先端側に突出する部分を、側面視鉤形状(L形状)となるように下方(図6では右方)へ折り曲げた。
図6に示すように、正極集電接合部F11が積層電極体10の積層方向(図6では上下方向)に略平行となるように、正極集電接合部F11よりも正負極板1、2側部(正極集電タブ11の基端部)で、矢印A11に示すように内側(図6では上側)へ折り曲げた。ついで、正極集電端子15と積層電極体10との間に架設するように、61mm×6mm×厚み35μmのポリイミド製の絶縁テープ46を正極集電接合部F11の先端側方向(図6では上方)から付着し、これにより、正極集電タブ11を所定の折り曲げ状態に保持して位置決めした。
図8に示すように、あらかじめ電極体が設置できるように成形したラミネートフィルム17で構成した外装体18に、上記積層電極体10を挿入し、正極集電端子15および負極集電端子16が外装体18より外部に突出するようにして、正極集電端子15および負極集電端子16がある辺を除く1辺を残し、熱融着した。
上記外装体18の熱溶着していない1辺から、エチレンカーボネート(EC)とメチルエチルカーボネート(MEC)とが体積比で30:70の割合で混合された混合溶媒に、LiPF6が1M(モル/リットル)の割合で溶解された電解液を注入した。最後に外装体18における熱溶着していない1辺を熱溶着して、電池A1を作製した。
〔正極の作製〕
図9に示すように、正極集電タブ31を幅L15=74mm、高さL16=25mmとし、正極集電タブ31の延出高さL16方向に延びる両側縁部のうちの内側縁部(図9では右側縁部)において、下端からL17=5mmの高さ位置より上方に、当該側端縁から矩形状に凹入するように切り欠いて、高さL18=3mm、幅L19=2mmの矩形の切欠状の貫通部31Sを形成する以外は、上記第1実施形態の電池A1における正極板1の場合と同様にして、正極板30を作製した。
図10に示すように、負極集電タブ41を幅L20=74mm、高さL21=25mmとし、負極集電タブ41の延出高さL21方向に延びる両側縁部のうちの内側縁部(図10では左側縁部)において、下端からL22=2mmの高さ位置より上方に、当該側端縁から矩形状に凹入するように切り欠いて、高さL23=3mm、幅L24=2mmの矩形の切欠状の貫通部41Sを形成する以外は、上記第1実施形態の電池A1における負極板2の場合と同様にして、負極板40を作製した。
上記正極板30および負極板40を用いる以外は上記第1実施形態の電池A1における積層電極体10の場合と同様にして積層電極体を作製し(図示省略)、この積層電極体における積層ズレの有無を上記第1実施形態の場合と同様にして検査した。
〔正極の作製〕
図13に示すように、正極集電タブ51を幅L27=74mm、高さL28=25mmの矩形とし、正極集電タブ51から幅方向における内側(図13では右側)にやや間隔L29≒2mmをおいて、正極集電タブ51と同方向へ幅L30=2mm、高さL31=5mmの矩形状の延出片51Pが延出する形状とする以外は、上記第2実施形態の電池A2における正極板30の場合と同様にして、正極板50を作製した。
図14に示すように、負極集電タブ61を幅L32=74mm、高さL33=25mmの矩形とし、負極集電タブ61から幅方向における内側(図14では左側)にやや間隔L34≒2mmをおいて、負極集電タブ61と同方向へ幅L35=2mm、高さL36=2mmの矩形状の延出片61Pが延出する形状とする以外は、上記第2実施形態の電池A2における負極板2の場合と同様にして、負極板60を作製した。
上記正極板50および負極板60を用いる以外は上記第2実施形態の電池A2における積層電極体の場合と同様にして積層電極体を作製し(図示省略)、上記位置合せ用の延出片51P、61Pを用いる以外は上記第2実施形態の電池A2における積層電極体の場合と同様にして、積層電極体における積層ズレの有無を検査した。
(1)上記第1ないし第3実施形態においては、位置合せ用の貫通部11S、12S、31S、41Sないし位置合せ用の延出片51P、61Pが、正極板1、30、50および負極板2、40、60の両方に形成されていたが、位置合せ用の貫通部ないし位置合せ用の延出片は正極および負極のいずれか一方のみに形成するようにしてもよい。ただし、正極および負極の両方に形成するほうが積層ズレの有無をより十全に検査できて望ましい。また、上述の通り、セパレータの端縁が負極の端縁よりも外側へ大きく延出するように成形される場合にはこれら両端縁の位置で位置ズレを検知し難くなることから、この場合に少なくとも負極の当該端縁に位置合せ用の貫通部ないし位置合せ用の延出片を形成することが望ましい。
金属層としてアルミニウム、アルミニウム合金、ステンレス等を、
内層(電池内側)としてポリエチレン、ポリプロピレン等を、
外層(電池外側)としてナイロン、ポリエチレンテレフタレート(PET)、PET/ナイロンの積層膜等を、
それぞれ用いて構成されるものが挙げられる。
11:正極集電タブ
11S:位置合せ用の貫通部
3:袋状セパレータ
3a:セパレータ
L3:正極集電タブの貫通部未形成位置における幅
L12:位置合せ用の貫通部の幅
Claims (34)
- 正極集電タブが延出する正極と負極集電タブが延出する負極とがセパレータを介して交互に積層された積層電極体を備える積層式電池であって、
前記正極集電タブおよび前記負極集電タブのうちの少なくとも一方に、厚さ方向に貫通する位置合せ用の貫通部が形成され、
前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブの延出方向に沿った延出高さ位置において前記位置合せ用の貫通部が形成されていない位置である貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が50mm以上であり、
前記位置合せ用の貫通部の、前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が、前記貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅の10%以下であることを特徴とする積層式電池。 - 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブが折り曲げて正極集電端子および負極集電端子に接合され、この折り曲げ位置よりも前記積層電極体側の位置に前記位置合せ用の貫通部が形成されている、請求項1に記載の積層式電池。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブに、予め折り曲げられて折り曲げ線が形成されている、請求項2に記載の積層式電池。
- 前記位置合せ用の貫通部における前記積層電極体側端縁が、前記正極集電タブまたは前記負極集電タブの延出方向に沿った延出高さ位置において、対向するセパレータの集電側端縁から±1mmの範囲内に形成されている、請求項1から請求項3のいずれかに記載の積層式電池。
- 前記セパレータが袋状に構成され、この袋状のセパレータ内に前記正極または前記負極が収容されている、請求項1から請求項4のいずれかに記載の積層式電池。
- 前記正極、前記負極および前記袋状のセパレータが方形状であり、前記正極が前記袋状のセパレータの内部に収容され、前記負極集電タブに前記位置合せ用の貫通部が形成され、前記負極の集電側端縁を除く3端縁が前記袋状のセパレータの集電側端縁を除く3端縁と実質的に同一線上に位置するように配置されている、請求項5に記載の積層式電池。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブの厚みが0.03mm以下である、請求項1から請求項6のいずれかに記載の積層式電池。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブのうち、同極性のもの同士が、平面視で重なる位置に配置されている、請求項1から請求項7のいずれかに記載の積層式電池。
- 正極集電タブが延出する正極と負極集電タブが延出する負極とがセパレータを介して交互に積層された積層電極体を備える積層式電池であって、
前記正極および前記負極のうちの少なくとも一方に、端縁から部分的に延出する位置合せ用の延出片が形成されていることを特徴とする積層式電池。 - 前記位置合せ用の延出片が、前記正極および前記負極のうちの少なくとも一方における集電側端縁に形成されている、請求項9に記載の積層式電池。
- 前記位置合せ用の延出片の先端が、該延出片の延出方向に沿った延出高さ位置において、対向するセパレータの端縁から±1mmの範囲内にくるように形成されている、請求項9または請求項10に記載の積層式電池。
- 前記位置合せ用の延出片の延出方向に直交する方向の幅が1~10mmである、請求項9から請求項11のいずれかに記載の積層式電池。
- 前記セパレータが袋状に構成され、この袋状のセパレータ内に前記正極または前記負極が収容されている、請求項9から請求項12のいずれかに記載の積層式電池。
- 前記正極、前記負極および前記袋状のセパレータが方形状であり、前記正極が前記袋状のセパレータの内部に収容され、前記負極の集電側端縁に前記位置合せ用の延出片が形成され、前記負極の集電側端縁を除く3端縁が前記袋状のセパレータの集電側端縁を除く3端縁と実質的に同一線上に位置するように配置されている、請求項13に記載の積層式電池。
- 積層された前記正極または前記負極のうち、同極性のものにおける位置合せ用の延出片同士が、平面視で重なる位置に配置されている、請求項9から請求項14のいずれかに記載の積層式電池。
- 正極集電タブが延出する正極と負極集電タブが延出する負極とをセパレータを介し交互に積層して積層電極体を作製する積層電極体作製工程を有する積層式電池の製造方法であって、
前記正極集電タブおよび前記負極集電タブのうちの少なくとも一方に、厚さ方向に貫通する位置合せ用の貫通部を形成し、
前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブの延出方向に沿った延出高さ位置において前記位置合せ用の貫通部が形成されていない位置である貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が50mm以上であり、
前記位置合せ用の貫通部の、前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅が、前記貫通部未形成位置における前記正極集電タブまたは前記負極集電タブの延出方向に直交する方向の幅の10%以下であり、
前記位置合せ用の貫通部で前記正極または前記負極の端縁と前記セパレータの端縁との間の位置ズレの有無を検査するようにすることを特徴とする積層式電池の製造方法。 - 前記位置ズレの有無の検査を、前記積層電極体作製工程における前記積層電極体の完成後に行う、請求項16に記載の積層式電池の製造方法。
- 前記位置ズレの有無の検査を、一方面側または他方面側からレーザで前記位置合せ用の貫通部を検出することにより行う、請求項16または請求項17に記載の積層式電池の製造方法。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブが折り曲げて正極集電端子および負極集電端子に接合され、この折り曲げ位置よりも前記積層電極体側の位置に前記位置合せ用の貫通部が形成されている、請求項16から請求項18のいずれかに記載の積層式電池の製造方法。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブに、予め折り曲げて折り曲げ線を形成しておく、請求項19に記載の積層式電池の製造方法。
- 前記位置合せ用の貫通部における前記積層電極体側端縁を、前記正極集電タブまたは前記負極集電タブの延出方向に沿った延出高さ位置において、対向するセパレータの集電側端縁から±1mmの範囲内に形成する、請求項16から請求項20のいずれかに記載の積層式電池の製造方法。
- 前記セパレータを袋状に構成し、この袋状のセパレータ内に前記正極または前記負極を収容する、請求項16から請求項21のいずれかに記載の積層式電池の製造方法。
- 前記正極、前記負極および前記袋状のセパレータを方形状に成形し、前記正極を前記袋状のセパレータの内部に収容し、前記負極集電タブに前記位置合せ用の貫通部を形成し、前記負極の集電側端縁を除く3端縁が前記袋状のセパレータの集電側端縁を除く3端縁と実質的に同一線上に位置するように配置する、請求項22に記載の積層式電池の製造方法。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブの厚みが0.03mm以下である、請求項16から請求項23のいずれかに記載の積層式電池の製造方法。
- 前記位置合せ用の貫通部が形成された前記正極集電タブまたは前記負極集電タブのうち、同極性のもの同士を、平面視で重なる位置に配置する、請求項16から請求項24のいずれかに記載の積層式電池の製造方法。
- 正極集電タブが延出する正極と負極集電タブが延出する負極とをセパレータを介し交互に積層して積層電極体を作製する積層電極体作製工程を有する積層式電池の製造方法であって、
前記正極および前記負極のうちの少なくとも一方に、端縁から部分的に延出する位置合せ用の延出片を形成し、
前記位置合せ用の延出片で前記正極または前記負極の端縁と前記セパレータの端縁との間の位置ズレの有無を検査するようにすることを特徴とする積層式電池の製造方法。 - 前記位置ズレの有無の検査を、前記積層電極体作製工程における前記積層電極体の完成後に行う、請求項26に記載の積層式電池の製造方法。
- 前記位置ズレの有無の検査を、一方面側または他方面側からレーザで前記位置合せ用の延出片を検出することにより行う、請求項26または請求項27に記載の積層式電池の製造方法。
- 前記位置合せ用の延出片を、前記正極および前記負極のうちの少なくとも一方における集電側端縁に形成する、請求項26から請求項28のいずれかに記載の積層式電池の製造方法。
- 前記位置合せ用の延出片の先端を、該延出片の延出方向に沿った延出高さ位置において、対向するセパレータの端縁から±1mmの範囲内にくるように形成する、請求項26から請求項29のいずれかに記載の積層式電池の製造方法。
- 前記位置合せ用の延出片の延出方向に直交する方向の幅が1~10mmである、請求項26から請求項30のいずれかに記載の積層式電池の製造方法。
- 前記セパレータを袋状に構成し、この袋状のセパレータ内に前記正極または前記負極を収容する、請求項26から請求項31のいずれかに記載の積層式電池の製造方法。
- 前記正極、前記負極および前記袋状のセパレータを方形状に成形し、前記正極を前記袋状のセパレータの内部に収容し、前記負極の集電側端縁に前記位置合せ用の延出片を形成し、前記負極の集電側端縁を除く3端縁が前記袋状のセパレータの集電側端縁を除く3端縁と実質的に同一線上に位置するように配置する、請求項32に記載の積層式電池の製造方法。
- 積層された前記正極または前記負極のうち、同極性のものにおける位置合せ用の延出片同士を、平面視で重なる位置に配置する、請求項26から請求項33のいずれかに記載の積層式電池の製造方法。
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| WO (1) | WO2013146513A1 (ja) |
Cited By (11)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015137060A1 (ja) * | 2014-03-13 | 2015-09-17 | 株式会社 豊田自動織機 | 蓄電装置 |
| JP2015176664A (ja) * | 2014-03-13 | 2015-10-05 | 株式会社豊田自動織機 | 蓄電装置 |
| US9871243B2 (en) | 2014-03-13 | 2018-01-16 | Kabushiki Kaisha Toyota Jidoshokki | Electric accumulation device |
| WO2015145551A1 (ja) * | 2014-03-24 | 2015-10-01 | 日産自動車株式会社 | 電気デバイスのセパレータ接合方法および電気デバイスのセパレータ接合装置 |
| JP2015232934A (ja) * | 2014-06-09 | 2015-12-24 | 株式会社豊田自動織機 | 蓄電装置 |
| CN107887560A (zh) * | 2016-09-30 | 2018-04-06 | 三洋电机株式会社 | 非水电解质二次电池 |
| JP2018170097A (ja) * | 2017-03-29 | 2018-11-01 | 株式会社豊田自動織機 | 電極組立体の製造方法 |
| JP2018190508A (ja) * | 2017-04-28 | 2018-11-29 | 株式会社豊田自動織機 | 蓄電装置の検査方法 |
| JP2019061878A (ja) * | 2017-09-27 | 2019-04-18 | Tdk株式会社 | 電気化学デバイス |
| JP2020170635A (ja) * | 2019-04-03 | 2020-10-15 | 積水化学工業株式会社 | 蓄電素子の製造方法 |
| JP2022528478A (ja) * | 2019-09-27 | 2022-06-10 | エルジー エナジー ソリューション リミテッド | 電極タブに陥凹部が形成された電極組立体、これを積層するためのガイド部材及びこれを用いたスタック型電池の製造方法 |
| JP7391447B2 (ja) | 2019-09-27 | 2023-12-05 | エルジー エナジー ソリューション リミテッド | 電極タブに陥凹部が形成された電極組立体、これを積層するためのガイド部材及びこれを用いたスタック型電池の製造方法 |
| JP2023530203A (ja) * | 2021-05-07 | 2023-07-13 | 寧徳時代新能源科技股▲分▼有限公司 | 電極アセンブリ、電池、装置及び電極アセンブリの製造方法 |
| JP7522298B2 (ja) | 2021-05-07 | 2024-07-24 | 寧徳時代新能源科技股▲分▼有限公司 | 電極アセンブリ、電池、装置及び電極アセンブリの製造方法 |
| JP2024003420A (ja) * | 2022-06-27 | 2024-01-15 | トヨタ自動車株式会社 | 電池および電池モジュール |
| JP7528989B2 (ja) | 2022-06-27 | 2024-08-06 | トヨタ自動車株式会社 | 電池および電池モジュール |
| JP2024150582A (ja) * | 2022-06-27 | 2024-10-23 | トヨタ自動車株式会社 | 電池および電池モジュール |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104205464B (zh) | 2016-11-02 |
| JPWO2013146513A1 (ja) | 2015-12-14 |
| CN104205464A (zh) | 2014-12-10 |
| JP6158789B2 (ja) | 2017-07-05 |
| US20150037658A1 (en) | 2015-02-05 |
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