WO2013146735A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
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- WO2013146735A1 WO2013146735A1 PCT/JP2013/058694 JP2013058694W WO2013146735A1 WO 2013146735 A1 WO2013146735 A1 WO 2013146735A1 JP 2013058694 W JP2013058694 W JP 2013058694W WO 2013146735 A1 WO2013146735 A1 WO 2013146735A1
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- negative electrode
- positive electrode
- current collector
- active material
- positive
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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
- 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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- 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
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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
- 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
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
- 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
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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
- 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
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
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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
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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
- 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 power storage device.
- the secondary battery is a multilayer in which a negative electrode in which a negative electrode active material is applied to a metal foil and a positive electrode in which a positive electrode active material is applied to a metal foil are insulated and laminated between each other with a separator made of a microporous film.
- An electrode assembly having a structure;
- a terminal is connected to each of a positive electrode and a negative electrode constituting an electrode assembly, and electricity is taken out through the terminal.
- the resistance of the metal foil that becomes the path of the electricity is a factor that reduces the output. Therefore, in the secondary battery, it is desired to improve the output by increasing the current collection efficiency from the electrodes.
- the present invention has been made by paying attention to such problems existing in the prior art, and an object thereof is to improve the output by increasing the current collection efficiency from the electrodes.
- an electrode assembly having a multilayer structure in which a positive electrode and a negative electrode are laminated with insulation therebetween, and electricity is exchanged with the positive electrode.
- the positive electrode includes a positive electrode metal thin plate and a positive electrode active material in which a positive electrode active material is applied to the positive electrode metal thin plate.
- a positive electrode current collector that is a portion to which the positive electrode active material is not applied, and the positive electrode current collector is connected to the positive electrode terminal.
- the negative electrode includes a negative electrode metal thin plate, and a negative electrode active material layer in which the negative electrode active material is applied to the negative electrode metal thin plate.
- the negative electrode metal thin plate includes the negative electrode
- a negative electrode current collector that is a portion not coated with an active material is provided, and the negative electrode current collector has a negative electrode connection that is a connection with the negative electrode terminal and extends from one end of the negative electrode
- the width direction is defined as a direction orthogonal to the extending direction of the positive electrode current collector and the negative electrode current collector, and in the width direction,
- a line extending along a direction in which the positive electrode current collector extends through the center of the positive electrode current collector is defined as a first virtual center line, and in the width direction, Extension of the negative electrode current collector through the center of the negative electrode current collector
- the line extending along the direction is defined as the second virtual center line
- the distance between the virtual reference line and the first virtual center line in the width direction is the virtual reference line and the second virtual center line.
- a power storage device having a different distance from the center line is provided.
- an electrode assembly having a multilayer structure in which a positive electrode and a negative electrode are laminated with insulation therebetween, a positive electrode terminal for taking out electricity from the positive electrode
- the positive electrode includes: a positive electrode metal thin plate; and a positive electrode active material layer obtained by applying a positive electrode active material to the positive electrode metal thin plate, and the positive electrode metal.
- the thin plate is provided with a positive electrode current collector that is a portion to which the positive electrode active material is not applied, and the positive electrode current collector has a positive electrode connection that is a connection with the positive electrode terminal and the positive electrode
- the negative electrode includes a negative electrode metal thin plate and a negative electrode active material layer obtained by applying a negative electrode active material to the negative electrode metal thin plate.
- a negative electrode current collector part is provided, and the negative electrode current collector part has a negative electrode connection part that is a connection part with the negative electrode terminal and extends from one end of the negative electrode, and the electrode assembly
- the width direction of the layered portion which is a region where the positive electrode active material layer and the negative electrode active material layer overlap in a three-dimensional shape, is a direction orthogonal to the extending direction of the positive electrode current collector and the negative electrode current collector
- a line extending along the direction in which the positive electrode current collector and the negative electrode current collector extend in the center of the electrode assembly in the width direction of the layered portion is defined as a virtual reference line, and the width direction of the positive electrode current collector Is the direction perpendicular to the direction in which the positive electrode current collector extends, the center of the positive electrode current collector in the width direction of the positive electrode current collector along the direction in which the positive electrode current collector extends.
- the extending line is defined as a first virtual center line, and the negative electrode current collector section
- the negative electrode current collector at the center in the width direction of the negative electrode current collector is along the direction in which the negative electrode current collector extends.
- the line extending in the width direction of the layered portion is defined as the second virtual center line
- the distance between the virtual reference line in the width direction of the layered portion and the first virtual centerline is the virtual reference line in the width direction of the layered portion.
- the second virtual center line thereby providing a power storage device in which the electrode assembly has an asymmetric structure.
- an electrode assembly having a multilayer structure in which a positive electrode and a negative electrode are laminated with insulation therebetween, a positive electrode terminal for taking out electricity from the positive electrode
- the positive electrode includes: a positive electrode metal thin plate; and a positive electrode active material layer obtained by applying a positive electrode active material to the positive electrode metal thin plate, and the positive electrode metal.
- the thin plate is provided with a positive electrode current collector that is a portion to which the positive electrode active material is not applied, and the positive electrode current collector has a positive electrode connection that is a connection with the positive electrode terminal and the positive electrode
- the negative electrode includes a negative electrode metal thin plate and a negative electrode active material layer obtained by applying a negative electrode active material to the negative electrode metal thin plate.
- a negative electrode active material is applied.
- a negative electrode current collector which has a negative electrode connection part which is a connection part with the negative electrode terminal, and extends from one end of the negative electrode.
- the width direction of the layered portion which is a region where the positive electrode active material layer and the negative electrode active material layer overlap in the assembly, is set to a direction orthogonal to the extending direction of the positive electrode current collector and the negative electrode current collector.
- a line extending along the extending direction of the positive electrode current collector and the negative electrode current collector at the center of the electrode assembly in the width direction of the layered portion is defined as a virtual reference line
- the positive electrode current collector is Of the portion of the positive electrode thin metal plate that is configured
- the end located near the virtual reference line is defined as a first end
- An end located near the virtual reference line in the portion is referred to as a second end.
- the distance between the virtual reference line and the first end in the width direction of the layered portion is the distance between the virtual reference line and the second end in the width direction of the layered portion.
- an electrode assembly having a multilayer structure in which a positive electrode and a negative electrode are laminated with insulation therebetween, a positive electrode terminal for taking out electricity from the positive electrode, and from the negative electrode
- the positive electrode includes: a positive electrode metal thin plate; and a positive electrode active material layer obtained by applying a positive electrode active material to the positive electrode metal thin plate, and the positive electrode metal.
- the thin plate is provided with a positive electrode current collector that is a portion to which the positive electrode active material is not applied, and the positive electrode current collector has a positive electrode connection that is a connection with the positive electrode terminal and the positive electrode
- the negative electrode includes a negative electrode metal thin plate and a negative electrode active material layer obtained by applying a negative electrode active material to the negative electrode metal thin plate.
- a negative electrode active material is applied.
- a negative electrode current collector which has a negative electrode connection part which is a connection part with the negative electrode terminal, and extends from one end of the negative electrode.
- the width direction of the layered portion which is a region where the positive electrode active material layer and the negative electrode active material layer overlap in the assembly, is set to a direction orthogonal to the extending direction of the positive electrode current collector and the negative electrode current collector.
- a line extending along a direction in which the positive electrode current collector and the negative electrode current collector extend in the center of the electrode assembly in the width direction of the layered portion is defined as a virtual reference line, and the width of the positive electrode connection portion
- the center of the positive electrode connection in the width direction of the positive current collector extends along the direction in which the positive current collector extends.
- a first virtual connection center line and the negative line The direction in which the negative electrode current collector extends in the center of the negative electrode connector in the width direction of the negative electrode connector when the width direction of the connection is perpendicular to the direction in which the negative electrode current collector extends.
- the distance between the virtual reference line and the first virtual connection center line in the width direction of the layered portion is the width direction of the layered portion.
- a power storage device is provided in which the distance between the virtual reference line and the second virtual connection center line is different, whereby the electrode assembly has an asymmetric structure.
- an electrode assembly having a multilayer structure in which a positive electrode and a negative electrode are laminated with insulation therebetween, a positive electrode terminal for taking out electricity from the positive electrode, and from the negative electrode
- the positive electrode includes: a positive electrode metal thin plate; and a positive electrode active material layer obtained by applying a positive electrode active material to the positive electrode metal thin plate, and the positive electrode metal.
- the thin plate is provided with a positive electrode current collector that is a portion to which the positive electrode active material is not applied, and the positive electrode current collector has a positive electrode connection that is a connection with the positive electrode terminal and the positive electrode
- the negative electrode includes a negative electrode metal thin plate and a negative electrode active material layer obtained by applying a negative electrode active material to the negative electrode metal thin plate.
- a negative electrode active material is applied.
- a negative electrode current collector which has a negative electrode connection part which is a connection part with the negative electrode terminal, and extends from one end of the negative electrode.
- the width direction of the layered portion which is a region where the positive electrode active material layer and the negative electrode active material layer overlap in the assembly, is set to a direction orthogonal to the extending direction of the positive electrode current collector and the negative electrode current collector.
- the line extending along the extending direction of the positive current collector and the negative current collector is defined as a virtual reference line at the center of the electrode assembly in the width direction of the layered portion, and connected to the positive connection portion
- a portion of the positive terminal that is positioned near the virtual reference line is defined as a first terminal end
- a portion of the negative terminal that is connected to the negative electrode connection portion is positioned near the virtual reference line Is defined as the second terminal end, the layer
- the distance between the virtual reference line and the first terminal end in the width direction of the part is different from the distance between the virtual reference line and the second terminal end in the width direction of the layered part.
- the current collector on one of the electrodes is close to the virtual reference line. That is, it becomes close to the center in the width direction of the region where the positive electrode active material layer and the negative electrode active material layer overlap. For this reason, when taking out electricity from the current collector on the electrode side close to the center, it becomes difficult to receive the resistance of the metal foil. Therefore, the current collection efficiency from the electrodes can be increased. As a result, the output can be improved.
- the positive electrode metal thin plate and the negative electrode metal thin plate have different resistances per unit distance, and one of the two distances per unit distance. It is preferable that the distance related to the electrode having a thin metal plate having a high resistance is shorter than the distance related to the other electrode. According to this, the current collector on the electrode side having a thin metal plate with high resistance is close to the center in the width direction of the region where the positive electrode active material layer and the negative electrode active material layer overlap. Therefore, the current collection efficiency from the electrode can be increased. As a result, the output can be improved efficiently.
- the virtual reference line has a width direction of a region where the positive electrode active material and the negative electrode active material overlap in the stacking direction of the electrode assembly.
- the direction perpendicular to the direction in which the current collector and the negative electrode current collector extend is the center of the electrode assembly in the width direction of the region, the positive current collector and the negative current collector extend. It may be a line extending along the direction. According to this, the current collection efficiency from an electrode can be raised suitably. As a result, the output can be improved efficiently.
- the positive electrode current collector and the negative electrode current collector extend in the same direction. According to this, when the current collecting part is drawn out in the same direction, the current collecting part on either electrode side is brought close to the center in the width direction of the region where the positive electrode active material layer and the negative electrode active material layer overlap. be able to. As a result, the current collection efficiency from the electrodes can be increased and the output can be improved.
- the electrode assembly may be configured by alternately stacking a plurality of the positive electrodes and a plurality of the negative electrodes. According to this, in a power storage device having a stacked electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are stacked, it is possible to increase the current collection efficiency from the electrodes and improve the output.
- the power storage device may be a secondary battery. According to this, the current collection efficiency from the electrode of a secondary battery can be improved. As a result, the battery output can be improved.
- the current collection effect from the electrodes can be enhanced to improve the output.
- the disassembled perspective view of the secondary battery of one Embodiment of this invention The perspective view which shows the external appearance of a secondary battery.
- the disassembled perspective view which shows the component of the electrode assembly of a secondary battery.
- Sectional drawing which shows the electrode assembly inserted in the battery case can.
- Sectional drawing which shows the connection state of the current collection part and terminal of a secondary battery.
- the schematic diagram which shows the distance to the current collection part in the electrode of a secondary battery.
- (A)-(c) is explanatory drawing explaining the result of the distance calculation according to the position of the current collection part of a secondary battery. Sectional drawing explaining another example of this invention. Sectional drawing explaining another example of this invention.
- (A)-(d) is explanatory drawing explaining another example of this invention.
- the secondary battery 2 as a power storage device includes an electrode assembly 5 accommodated in a metal battery case 3.
- the battery case 3 includes a rectangular parallelepiped main body member 4 and a rectangular flat lid member 6 that closes the opening 4 a of the main body member 4.
- Both the main body member 4 and the lid member 6 are made of metal (for example, stainless steel or aluminum).
- the secondary battery 2 of the present embodiment is a prismatic battery whose outer shell forms a square shape.
- the secondary battery 2 of this embodiment is a lithium ion battery.
- the positive electrode terminal 7 and the negative electrode terminal 8 for transmitting / receiving electricity to / from the electrode assembly 5 are electrically connected to the electrode assembly 5.
- the positive electrode terminal 7 is a plate-like external terminal 7 a partially exposed to the outside of the battery case 3 and a plate-like shape that is entirely accommodated inside the battery case 3.
- an internal terminal 7b is an internal terminal 7b.
- the negative electrode terminal 8 is, as shown in FIG. 4, a cylindrical external terminal 8 a that is partially exposed to the outside of the battery case 3 and a plate that is entirely accommodated inside the battery case 3. Shaped internal terminal 8b.
- the external terminal 7 a of the positive electrode terminal 7 and the external terminal 8 a of the negative electrode terminal 8 are exposed to the outside of the battery case can 3 through a pair of opening holes 6 a provided in the lid member 6 at a predetermined interval.
- the positive electrode terminal 7 and the negative electrode terminal 8 are each provided with an insulating ring 9 a for insulating them from the battery case can 3.
- the inner surface of the main body member 4 of the battery case can 3 is insulated to insulate between the metal main body member 4 and the electrode assembly 5 housed inside the battery case can 3.
- a sheet 9b is attached. As shown in FIG.
- the inner surface of the lid member 6 of the battery case can 3 is insulated to insulate between the metal lid member 6 and the electrode assembly 5 housed inside the battery case can 3.
- a sheet 9c is attached.
- the electrode assembly 5 includes a positive electrode sheet 10 serving as a positive electrode and a negative electrode sheet 11 serving as a negative electrode.
- the positive electrode sheet 10 has a positive electrode metal foil (aluminum foil in this embodiment) 13 as a positive electrode metal thin plate, and a positive electrode active material layer 14 formed by applying a positive electrode active material on both surfaces thereof.
- the negative electrode sheet 11 has a negative electrode metal foil (a copper foil in the present embodiment) 17 as a negative electrode metal thin plate, and a negative electrode active material layer 18 formed by applying a negative electrode active material on both surfaces thereof.
- the electrode assembly 5 has a multilayer structure in which a positive electrode sheet 10 and a negative electrode sheet 11 are stacked with a separator 12 interposed therebetween.
- the electrode assembly 5 is configured by alternately laminating a plurality of positive electrode sheets 10 and a plurality of negative electrode sheets 11. That is, the electrode assembly 5 is provided with a plurality of sets each including a positive electrode sheet 10, a negative electrode sheet 11, and a separator 12.
- a positive electrode tab-like portion 15 made of a part of the positive electrode metal foil 13 is formed on a part of the edge of each positive electrode sheet 10.
- the positive electrode tab-like portion 15 has a positive electrode current collecting portion 16 that is a region where the positive electrode active material layer 14 is not applied.
- the positive electrode current collector 16 is composed of a part of the positive electrode metal foil 13. In the present embodiment, the entire area of the positive electrode tab-like portion 15 is the positive electrode current collector 16.
- the positive electrode current collector 16 is formed at the edge of the positive electrode sheet 10.
- the positive electrode tab-like portions 15, that is, the positive electrode current collector portions 16 are all provided at the same position in each positive electrode sheet 10 and have the same shape.
- a negative electrode tab-like portion 19 made of a part of the negative electrode metal foil 17 is formed on a part of the edge of each negative electrode sheet 11.
- the negative electrode tab-like portion 19 has a negative electrode current collector 20 that is a region where the negative electrode active material layer 18 is not applied.
- the negative electrode current collector 20 is made of a part of the negative electrode metal foil 17.
- the entire area of the negative electrode tab-like portion 19 is the negative electrode current collector 20.
- the negative electrode current collector 20 is formed at the edge of the negative electrode sheet 11.
- the negative electrode tab-like portion 19, that is, the negative electrode current collecting portion 20 is all provided at the same position in each negative electrode sheet 11 and has the same shape.
- region which applied the active material among the positive electrode sheet 10 and the negative electrode sheet 11 is a coating part, and the area
- the positive electrode sheet 10 of the electrode assembly 5 is laminated so that the positive electrode current collectors 16 of the respective positive electrode sheets 10 are arranged side by side along the lamination direction of the positive electrode sheets 10.
- the negative electrode sheet 11 of the electrode assembly 5 is arranged side by side along the stacking direction of the negative electrode sheet 11 at a position where the negative electrode current collector 20 of each negative electrode sheet 11 does not overlap the positive electrode current collector 16. Is laminated.
- the positive electrode current collectors 16 are collected together within the thickness range of the electrode assembly 5 to form a positive electrode current collector group 21.
- the negative electrode current collector 20 is gathered together within the thickness range of the electrode assembly 5 to form a negative electrode current collector group 22.
- the internal terminal 7 b of the positive electrode terminal 7 is electrically joined to the positive electrode current collection group 21.
- the internal terminal 8 b of the negative electrode terminal 8 is electrically connected to the negative electrode current collection group 22.
- the internal terminal 7b of the positive electrode terminal 7 and the internal terminal 8b of the negative electrode terminal 8 are joined to the positive electrode current collection group 21 and the negative electrode current collection group 22 by resistance welding, respectively. Resistance welding is a method in which the objects to be joined are welded by sandwiching a pair of positive and negative electrodes for welding.
- the internal terminal 7b of the positive electrode terminal 7 and each positive electrode current collector 16 of the positive electrode current collector group 21 are connected by resistance welding, and each of the internal terminal 8b of the negative electrode terminal 8 and each of the negative electrode current collector group 22 is connected.
- a negative electrode current collector 20 is connected.
- the portion connecting the internal terminal 7 b of the positive electrode terminal 7 and the positive electrode current collector group 21, that is, each positive electrode current collector 16 is the positive electrode connector S ⁇ b> 1.
- the positive electrode sheet 10 and the negative electrode sheet 11 of the electrode assembly 5 are each formed in a rectangular shape (rectangular shape) when viewed from the front, as shown in FIG.
- the positive electrode sheet 10 and the negative electrode sheet 11 have the same size. That is, the lengths of the positive electrode sheet 10 in the longitudinal direction and the short direction are the same as the lengths of the negative electrode sheet 11 in the longitudinal direction and the short direction, respectively.
- the positive electrode tab-like portion 15 is formed at one edge along the longitudinal direction of the positive electrode sheet 10 so as to extend along the short direction of the positive electrode sheet 10.
- the direction in which the positive electrode tab-like portion 15 extends coincides with the direction in which the positive electrode current collector 16 extends. That is, the positive electrode current collector 16 is formed to extend from one end of the positive electrode sheet 10.
- the positive electrode sheet 10 is coated with a positive electrode active material over the entire region excluding the positive electrode tab-like portion 15, that is, the positive electrode current collector 16.
- the positive electrode active material layer 14 is formed in a rectangular shape in front view. Then, electricity can be taken out from the positive electrode sheet 10 via the positive electrode current collector 16. That is, the electricity taken out from the positive electrode sheet 10 can take a current collection path toward the positive electrode current collector 16 through the positive electrode metal foil 13 at the portion where the positive electrode active material layer 14 is applied.
- the negative electrode tab-like portion 19 is formed on an edge of one side along the longitudinal direction of the negative electrode sheet 11 so as to extend along the short direction of the negative electrode sheet 11.
- the direction in which the negative electrode tab-shaped portion 19 extends coincides with the direction in which the negative electrode current collector 20 extends. That is, the negative electrode current collector 20 is formed so as to extend from one end of the negative electrode sheet 11.
- the negative electrode sheet 11 is coated with a negative electrode active material over the entire region excluding the negative electrode tab-like portion 19, that is, the negative electrode current collector 20.
- the negative electrode active material layer 18 is formed in a rectangular shape in front view. Then, electricity can be taken out from the negative electrode sheet 11 via the negative electrode current collector 20. That is, the electricity taken out from the negative electrode sheet 11 can take a current collection path toward the negative electrode current collector 20 through the negative electrode metal foil 17 at the portion where the negative electrode active material layer 18 is applied.
- the positive electrode sheet 10 and the negative electrode sheet 11 configured as described above are laminated so that the extending directions of the positive electrode current collector 16 and the negative electrode current collector 20 are in the same direction. Is done.
- the electrode assembly 5 formed by laminating the positive electrode sheet 10 and the negative electrode sheet 11 is arranged in the battery case can 3 so that the positive electrode current collector 16 and the negative electrode current collector 20 face the lid member 6 side. Be contained.
- the respective active material layers, that is, the positive electrode active material layer 14 and the negative electrode active material layer 18 face each other across the separator 12.
- a layered portion 25 is formed in the electrode assembly 5 as a region (a layered portion) where the positive electrode active material layer 14 and the negative electrode active material layer 18 overlap.
- the width direction W ⁇ b> 1 of the layered portion 25 is along the direction orthogonal to the extending direction of the positive electrode current collector 16 and the negative electrode current collector 20.
- the width direction W ⁇ b> 1 of the layered portion 25 is along the direction of the surface of the electrode assembly 5.
- the width direction W ⁇ b> 1 of the layered portion 25 is also along the longitudinal direction of the positive electrode sheet 10 and the negative electrode sheet 11.
- the height direction H1 of the layered portion 25 is along the extending direction of the positive electrode current collector 16 and the negative electrode current collector 20 as shown in FIG.
- the height direction H ⁇ b> 1 of the layered portion 25 is also along the short direction of the positive electrode sheet 10 and the negative electrode sheet 11.
- the positive electrode current collector 16 and the negative electrode current collector 20 are arranged in parallel along the width direction W ⁇ b> 1 of the layered part 25. That is, the width direction of the positive electrode sheet 10 and the negative electrode sheet 11 is orthogonal to the direction in which the positive electrode current collector 16 and the negative electrode current collector 20 extend.
- the width direction W2 of the positive electrode current collector 16 is orthogonal to the direction in which the positive electrode current collector 16 extends, and is along the width direction W1 of the layered portion 25.
- the width direction W3 of the negative electrode current collector 20 is orthogonal to the direction in which the negative electrode current collector 20 extends, and is along the width direction W1 of the layered part 25.
- the virtual reference line F1 is the width direction when the longitudinal direction of the electrode assembly 5, that is, the width direction W1 of the layered portion 25 is a direction orthogonal to the extending direction of the positive electrode current collector 16 and the negative electrode current collector 20 This is a line extending along the extending direction of the positive electrode current collector 16 and the negative electrode current collector 20 at the center of the electrode assembly 5 at W1.
- the first virtual center line F2 is defined by the positive electrode current collector 16 in the width direction W2 when the width direction W2 of the positive electrode current collector 16 is perpendicular to the direction in which the positive electrode current collector 16 extends. It is a line extending along the direction in which the current collector 16 extends.
- the second virtual center line F3 has a negative electrode current collector 20 centered in the width direction W3 when the width direction W3 of the negative electrode current collector 20 is a direction orthogonal to the direction in which the negative electrode current collector 20 extends. It is a line extending along the direction in which the current collector 20 extends.
- the positive electrode current collector 16 and the negative electrode current collector 20 of the electrode assembly 5 of the present embodiment define the virtual reference line F1, the first virtual center line F2, and the second virtual center line F3 as described above. Are arranged at asymmetric positions around the virtual reference line F1. That is, the positive electrode current collector 16 and the negative electrode current collector 20 are disposed at asymmetric positions around the virtual reference line F1 when the electrode assembly 5 is viewed from the front along the stacking direction.
- the distance in the width direction W1 and the width direction W2 between the virtual reference line F1 and the first virtual center line F2 is the distance X1 as the first center distance.
- the positive electrode sheet 10 is formed.
- the negative electrode current collector 20 has the negative electrode sheet 11 so that the distance in the width direction W1 and the width direction W3 between the virtual reference line F1 and the second virtual center line F3 is the distance Y1 as the second center distance. Is formed.
- the positive electrode current collector 16 and the negative electrode current collector 20 are formed in the same size. That is, the size of the positive electrode current collector 16 in the width direction W2 is the same as the size of the negative electrode current collector 20 in the width direction W2. For this reason, in the electrode assembly 5 of this embodiment, the positive electrode current collector 16 (the positive electrode current collector group 21) is more in the electrode assembly 5 than the negative electrode current collector 20 (the negative electrode current collector group 22).
- the positive electrode current collector 16 (the positive electrode current collector group 21) is more in the electrode assembly 5 than the negative electrode current collector 20 (the negative electrode current collector group 22).
- the distance in W1 and the width direction W2 is represented by X2.
- the distance between the end surface 17a as the second end of the negative electrode metal foil 17 of the negative electrode current collector 20 and the virtual reference line F1 is Represented by Y2.
- the distance X2 and the distance Y2 are different. Specifically, the distance X2 is shorter than the distance Y2.
- the end face 13 a of the positive electrode metal foil 13 is located near the virtual reference line F ⁇ b> 1 among the end faces of the positive electrode metal foil 13 constituting the positive electrode current collector 16, and the width direction of the positive electrode current collector 16 It is an end surface along the direction orthogonal to W2, that is, the direction in which the positive electrode current collector 20 extends.
- the end surface 17a of the negative electrode metal foil 17 is located closer to the virtual reference line F1 in the end surface of the negative electrode metal foil 17 constituting the negative electrode current collector 20, and the width direction of the negative electrode current collector 20 It is an end surface along the direction orthogonal to W3, that is, the direction in which the negative electrode current collector 20 extends.
- the internal terminal 7b of the positive electrode terminal 7 and the positive electrode current collector 16 are connected by a positive electrode connection portion S1 extending across the width direction W2 of the positive electrode current collector 16 as shown in FIG.
- the first virtual center line F2 defines the center of the positive electrode connection portion S1 in the width direction W2 when the width direction W2 of the positive electrode connection portion S1 is a direction orthogonal to the direction in which the positive electrode current collector portion 16 extends.
- the first virtual connection center line extending along the direction in which the positive electrode current collector 16 extends.
- the distance X1 between the virtual reference line F1 and the first virtual center line F2 can be restated as the first inter-connection distance.
- the internal terminal 8b of the negative electrode terminal 8 and the negative electrode current collector 20 are connected by a negative electrode connection part S2 extending across the width direction W3 of the negative electrode current collector 20 as shown in FIG.
- the second virtual center line F3 defines the center of the negative electrode connection portion S2 in the width direction W3 when the width direction W3 of the negative electrode connection portion S2 is a direction orthogonal to the direction in which the negative electrode current collector 20 extends.
- the second virtual connection center line extending along the direction in which the negative electrode current collector 20 extends.
- the distance Y1 between the virtual reference line F1 and the second virtual center line F3 can be restated as the second inter-connection distance.
- the internal terminal 7b of the positive electrode terminal 7 is connected to the positive electrode current collector 16 so as to be flush with the end surface 13a of the positive electrode metal foil 13 as shown in FIG. Terminal end surface 7c as a first terminal end.
- the distance X2 between the virtual reference line F1 and the end face 13a of the positive electrode metal foil 13 is the distance between the virtual reference line F1 and the terminal end face 7c located closer to the virtual reference line F1 in the positive electrode terminal 7.
- the internal terminal 8b of the negative electrode terminal 8 is connected to the negative electrode current collector 20 so as to be flush with the end surface 17a of the negative electrode metal foil 17 as shown in FIG. Terminal end face 8c as a second terminal end.
- the distance Y2 between the virtual reference line F1 and the end face 17a of the negative electrode metal foil 17 is the distance between the virtual reference line F1 and the terminal end face 8c located closer to the virtual reference line F1 in the negative electrode terminal 8.
- the secondary battery 2 of the present embodiment has the electrode assembly 5 having an asymmetric structure in the internal space of the battery case 3.
- the distances X1 and X2 related to the positive electrode current collector 16 (the positive electrode current collector group 21) extending from the electrode assembly 5 are set as the negative electrode current collector.
- the positive electrode current collector 16 is disposed closer to the virtual reference line F1 by being shorter than the distances Y1 and Y2 related to 20 (the negative electrode current collector group 22).
- the output of the secondary battery 2 can be increased by improving the current collection efficiency from the electrode assembly 5.
- the current collection efficiency is dependent on the resistance of the metal foil which comprises an electrode.
- the resistance of the metal foil is proportional to the electrical path to the current collector to which the terminal is connected, that is, the length of the current collector path. That is, the longer the current collection path, the lower the current collection efficiency due to the influence of the resistance of the metal foil. Therefore, it is desirable for the electrode to form a current collecting portion at a position where the current collecting path can be minimized.
- FIG. 6 and FIGS. 7A to 7C show examples in which the length of the current collecting path is calculated when the current collecting portions T1, T2, and T3 are formed at different positions with respect to the electrodes.
- the active material layer is divided into a plurality of regions, and as shown in FIGS. 7 (a) to (c), the middle of each region is in contact with the current collector. The distance to the point is calculated. In this embodiment, the total distance obtained by adding the distances is calculated as the length of the current collection path.
- the active material layer is divided into three sections in the vertical direction and five sections in the horizontal direction, and the distance is calculated in 15 regions.
- the distance between the midpoints of the regions adjacent in the horizontal direction is set as [1]
- the distance between the midpoints of the regions adjacent in the vertical direction is set as [1].
- FIG. 7A shows a calculation example when the current collector T1 is formed in the region [A3].
- each distance from each area [A1] to [A5], [B1] to [B5], [C1] to [C5] to the area [A3] where the current collector T1 is formed is shown in FIG. As shown in (a).
- the sum of the distances between the respective areas is [A1] + [A2] +. + [A5] + [B1] + [B2] + .. + [B5] + [C1] + [C2] + .. + [C5] ⁇ 26.4
- FIG. 7B is a calculation example when the current collector T2 is formed in the region [A1].
- each distance from each area [A1] to [A5], [B1] to [B5], [C1] to [C5] to the area [A1] where the current collector T2 is formed is shown in FIG. As shown in (b).
- the sum of the distances between the respective areas is [A1] + [A2] +. + [A5] + [B1] + [B2] + .. + [B5] + [C1] + [C2] + .. + [C5] ⁇ 37.1
- FIG. 7C shows a calculation example when the current collector T3 is formed in the region [A2].
- each distance from each area [A1] to [A5], [B1] to [B5], [C1] to [C5] to area [A2] where current collector T3 is formed is shown in FIG. As shown in (c).
- the sum of the distances between the respective areas is [A1] + [A2] +. + [A5] + [B1] + [B2] + .. + [B5] + [C1] + [C2] + . + [C5] ⁇ 29.1.
- the length of the current collecting path in the case of the current collecting part T1 is [26.4]
- the length of the current collecting path in the case of the current collecting part T2 is [37.1]
- the length of the current collecting path is [29.1]. Therefore, in this calculation example, the length of the current collecting path in the case of the current collecting part T1 is the shortest, and the length of the current collecting path in the case of the current collecting part T2 is the longest. That is, it can be seen that when the current collector is arranged in the center of the electrode, the length of the current collection path is the shortest and the current collection efficiency is the best. Moreover, it turns out that current collection efficiency improves, so that a current collection part is provided in the position near the center of an electrode.
- the positive electrode metal foil 13 is an aluminum foil and the negative electrode metal foil 17 is a copper foil as in the present embodiment
- these metal foils have different electrical conductivities.
- the electrical conductivity of aluminum and the electrical conductivity of copper are compared, the electrical conductivity of aluminum is lower than that of copper. That is, in the case of an aluminum foil and a copper foil having the same thickness, the aluminum foil has a higher resistance per unit distance. The unit distance is a distance on the current collecting path from the metal foil toward the current collecting unit.
- the positive electrode using an aluminum foil as the positive electrode metal foil 13 is more resistant than the negative electrode using a copper foil as the negative metal foil 17. Becomes larger.
- the electrode assembly 5 according to the present embodiment is based on the above-described calculation example. As shown in FIG. It is arranged at the center, that is, closer to the virtual reference line F1. Thereby, in the electrode assembly 5 of this embodiment, the current collection efficiency from the electrode assembly 5 can be improved as a result by improving the current collection efficiency on the positive electrode side.
- the secondary battery 2 having the electrode assembly 5 of the present embodiment can improve its battery output. Further, according to the configuration of the secondary battery 2 of the present embodiment, when the same battery output is to be obtained, the amount of active material layer applied is small due to the increased current collection efficiency, and as a result, the secondary battery The physique (size) of the battery 2 can be reduced. Further, in a vehicle equipped with the secondary battery 2 of the present embodiment, the running performance (acceleration performance, fuel consumption, etc.) of the vehicle can be improved by improving the battery output.
- the positive electrode current collector 16 is disposed close to the virtual reference line F1. For this reason, when taking out electricity from the positive electrode current collection part 16 arrange
- the positive electrode metal foil 13 made of aluminum foil has a higher resistance per unit distance than the negative electrode metal foil 17 made of copper foil. For this reason, the current collection efficiency from the positive electrode (positive electrode sheet 10) can be increased by arranging the positive electrode current collector 16 close to the virtual reference line F1. As a result, battery output can be improved efficiently.
- the virtual reference line F1 is defined in the width direction W1 of the layered portion 25 when the width direction W1 of the layered portion 25 is a direction orthogonal to the extending direction of the positive electrode current collector 16 and the negative electrode current collector 20. This is a line extending along the direction in which the positive electrode current collector 16 and the negative electrode current collector 20 extend in the center of the electrode assembly 5.
- the positive electrode current collector 16 is disposed close to the virtual reference line F1. As a result, the current collection efficiency from the positive electrode (positive electrode sheet 10) can be increased and the battery output can be improved.
- the electrode assembly 5 is configured by laminating a plurality of positive electrode sheets 10 and a plurality of negative electrode sheets 11. For this reason, in the secondary battery 2 having the stacked electrode assembly 5, the current collection efficiency from the electrode (the positive electrode in the embodiment) can be increased and the battery output can be improved.
- the running performance (acceleration performance and fuel consumption) of the vehicle can be improved by increasing the current collection efficiency.
- the negative electrode current collector 20 may be disposed near the virtual reference line F1. That is, the distance Y1 between the virtual reference line F1 and the second virtual center line F3 and the distance Y2 between the virtual reference line F1 and the end surface 17a of the negative electrode metal foil 17 are set as the virtual reference line F1 and the first virtual center. The distance X1 between the line F2 and the distance X2 between the virtual reference line F1 and the end face 13a of the positive electrode metal foil 13 may be shorter. Even in this case, the secondary battery 2 includes the electrode assembly 5 having an asymmetric structure. The resistance of the metal foil decreases as the thickness of the metal foil increases.
- the negative electrode current collector 20 may be disposed near the virtual reference line F1.
- the positive electrode current collector 16 may be formed so that the virtual reference line F1 and the first virtual center line F2 coincide. In this case, the positive electrode current collector 16 is disposed in the center when the electrode assembly 5 is viewed from the front along the stacking direction. Similarly, the negative electrode current collector 20 may be formed so that the virtual reference line F1 and the second virtual center line F3 coincide.
- the positive electrode terminal 7 may be disposed immediately above the positive electrode current collector 16. That is, the connection configuration between the positive electrode current collector 16 and the positive electrode terminal 7 may be the same as the connection configuration between the negative electrode current collector 20 and the negative electrode terminal 8.
- the connection configuration of the above embodiment may be used, or the connection configuration of this another example may be used.
- the overcurrent protection circuit 28 may be arranged using the space 27.
- the overcurrent protection circuit 28 is interposed between the external terminal 7a and the internal terminal 7b, and the external terminal 7a and the internal terminal 7b are electrically connected via the overcurrent protection circuit 28. According to this, the space in the battery case can 3 can be used effectively, and the dead space in the battery case can 3 can be reduced. The same applies to the case where the negative electrode current collector 20 is disposed near the virtual reference line F1.
- Insulation sheet 9c attached to the inner surface of the battery case 3 if there is sufficient clearance between the inner surface of the battery case 3 and the outer surface of the electrode assembly 5 to satisfy the insulation. May be omitted.
- FIGS. 10A to 10D are diagrams schematically showing an electrode assembly 5 according to another example of the present invention.
- the positive electrode current collector 16 and the negative electrode current collector 20 are arranged at symmetrical positions around the virtual reference line F1. That is, the distance X1 between the virtual reference line F1 and the first virtual center line F2 is the same as the distance Y1 between the virtual reference line F1 and the second virtual center line F3.
- the connection structure of the positive electrode terminal 7 to the positive electrode current collector 16 is different from the connection structure of the negative electrode terminal 8 to the negative electrode current collector 20.
- the negative electrode terminal 8 is connected so as to be away from the virtual reference line F1, and the length of the negative electrode connection portion S2 in the width direction W3 is compared with the length of the positive electrode connection portion S1 in the width direction W2. It is shortened.
- the distance X3 between the first virtual connection center line F4 passing through the center of the positive electrode connection part S1 and the virtual reference line F1 is equal to the second virtual connection center line F5 passing through the center of the negative electrode connection part S2 and the virtual reference line F1. It is shorter than the distance Y3.
- a distance X4 between the terminal end surface 7c of the positive electrode terminal 7 and the virtual reference line F1 is shorter than a distance Y4 between the terminal end surface 8c of the negative electrode terminal 8 and the virtual reference line F1.
- the current collection efficiency of the electrode assembly 5 can be improved. That is, even when the positive electrode current collector 16 and the negative electrode current collector 20 are arranged at symmetrical positions, the current collection efficiency differs depending on the connection position between the current collector and the terminal. The same applies to the case where the relationship between the positive electrode current collector 16 and the negative electrode current collector 20 is reversed.
- the negative electrode current collector 20 is disposed closer to the virtual reference line F1 than the positive electrode current collector 16. That is, the distance Y1 between the virtual reference line F1 and the second virtual center line F3 is shorter than the distance X1 between the virtual reference line F1 and the first virtual center line F2.
- the connection structure of the positive electrode terminal 7 to the positive electrode current collector 16 is different from the connection structure of the negative electrode terminal 8 to the negative electrode current collector 20.
- the negative electrode terminal 8 is connected so as to be away from the virtual reference line F1, and the length of the negative electrode connection portion S2 in the width direction W3 is compared with the length of the positive electrode connection portion S1 in the width direction W2. It is shortened.
- the distance X3 between the first virtual connection center line F4 passing through the center of the positive electrode connection part S1 and the virtual reference line F1 is equal to the second virtual connection center line F5 passing through the center of the negative electrode connection part S2 and the virtual reference line F1. It is shorter than the distance Y3.
- a distance X4 between the terminal end surface 7c of the positive electrode terminal 7 and the virtual reference line F1 is shorter than a distance Y4 between the terminal end surface 8c of the negative electrode terminal 8 and the virtual reference line F1. Even if comprised in this way, while being able to improve the current collection efficiency of the positive electrode side, the current collection efficiency of the electrode assembly 5 can be improved.
- the current collection efficiency differs depending on the connection position between the current collector and the terminal. The same applies to the case where the relationship between the positive electrode current collector 16 and the negative electrode current collector 20 is reversed.
- both the positive electrode current collector 16 and the negative electrode current collector 20 are arranged near the virtual reference line F1, and the positive electrode current collector 16 is centered on the virtual reference line F1.
- the negative electrode current collector 20 is disposed at a symmetrical position. That is, the distance X1 between the virtual reference line F1 and the first virtual center line F2 is the same as the distance Y1 between the virtual reference line F1 and the second virtual center line F3.
- the connection structure of the positive electrode terminal 7 to the positive electrode current collector 16 is different from the connection structure of the negative electrode terminal 8 to the negative electrode current collector 20.
- the negative electrode terminal 8 is connected so as to be away from the virtual reference line F1, and the length of the negative electrode connection portion S2 in the width direction W3 is compared with the length of the positive electrode connection portion S1 in the width direction W2. It is shortened.
- the distance X3 between the first virtual connection center line F4 passing through the center of the positive electrode connection part S1 and the virtual reference line F1 is equal to the second virtual connection center line F5 passing through the center of the negative electrode connection part S2 and the virtual reference line F1. It is shorter than the distance Y3.
- a distance X4 between the terminal end surface 7c of the positive electrode terminal 7 and the virtual reference line F1 is shorter than a distance Y4 between the terminal end surface 8c of the negative electrode terminal 8 and the virtual reference line F1.
- the position of the terminal end face 7c exists on the virtual reference line F1.
- the current collection efficiency on the positive electrode side can be improved, and the current collection efficiency of the electrode assembly 5 can be improved. That is, even if the positive electrode current collector 16 and the negative electrode current collector 20 are arranged at symmetrical positions, the current collection efficiency varies depending on the connection position between the current collector and the terminal. The same applies to the case where the relationship between the positive electrode current collector 16 and the negative electrode current collector 20 is reversed.
- the sizes of the positive electrode sheet 10 and the negative electrode sheet 11 are different. Specifically, the size of the positive electrode sheet 10 is made smaller than the size of the negative electrode sheet 11.
- the layered portion 25 is formed at a position where the positive electrode active material layer 14 of the positive electrode sheet 10 and the negative electrode active material layer 18 of the negative electrode sheet 11 face each other.
- the position of the virtual reference line F1 passing through the center of the layered portion 25 is different from the position of the virtual reference line V passing through the center of the negative electrode sheet 11 having a size larger than that of the positive electrode sheet 10.
- the positive electrode current collector 16 and the negative electrode current collector 20 are arranged with reference to a virtual reference line F1 passing through the center of the layered portion 25. That is, in another example of FIG. 10D, the distance X1 between the virtual reference line F1 and the first virtual center line F2 is larger than the distance Y1 between the virtual reference line F1 and the second virtual center line F3.
- the positive electrode current collector 16 and the negative electrode current collector 20 are arranged so as to be shorter. Even in such a configuration, the current collection efficiency on the positive electrode side can be improved, and the current collection efficiency of the electrode assembly 5 can be improved.
- the current collection efficiency differs depending on the position of the current collector.
- the current collection efficiency varies depending on the connection position of the current collector and the terminal.
- the virtual reference line F1 is defined based on the case where the electrode assembly 5 is viewed from the front along the stacking direction, but the electrode assembly 5 is along the direction orthogonal to the stacking direction as shown in FIG.
- the reference line Fx (corresponding to the virtual reference line F1) may be determined based on the side view.
- the width of the region where the positive electrode active material layer 14 and the negative electrode active material layer 18 overlap (a portion forming a layer) is the thickness of the electrode assembly 5 along the stacking direction of the electrode assemblies 5.
- the arrangement of the positive electrode current collector 16 and the negative electrode current collector 20 may be set similarly to the above embodiment.
- the electrode assembly 5 when the electrode assembly 5 is viewed from the side, the distance between the positive electrode current collector 16 (positive electrode connection part S1) and the reference line Fx, and the negative electrode current collector 20 (negative electrode connection part S2) and the reference line Fx. Any of the distances between them may be shortened.
- the shapes of the positive electrode sheet 10, the negative electrode sheet 11, and the separator 12 may be changed.
- the positive electrode sheet 10, the negative electrode sheet 11, and the separator 12 may be square in a front view.
- the bonding mode between the positive electrode current collector 16 (positive electrode current collecting group 21) and the positive electrode terminal 7 and the bonding mode between the negative electrode current collector 20 (negative electrode current collecting group 22) and the negative electrode terminal 8 are the above-described embodiments. It is not limited to this configuration and may be changed arbitrarily.
- the positive electrode current collector 16 or the negative electrode current collector 20 may be individually joined to the positive electrode terminal 7 or the negative electrode terminal 8 without forming the current collection group.
- the present invention may be applied not only to the laminated secondary battery 2 as in the above embodiment, but also to a wound secondary battery obtained by winding and laminating a belt-like positive electrode sheet and a belt-like negative electrode sheet.
- the positive electrode sheet and the negative electrode sheet are insulated by interposing a separator therebetween.
- the positive electrode tab-shaped portion 15 positive electrode current collecting portion 16
- the negative electrode tab-shaped portion 19 negative electrode current collecting portion 20
- the entire area of the positive electrode tab-like portion 15 may not be the positive electrode current collector 16. That is, the positive electrode tab-like portion 15 may have a coated portion that is a region where the positive electrode active material is applied and an uncoated portion that is a region where the positive electrode active material is not applied.
- the entire area of the negative electrode tab-shaped portion 19 may not be the negative electrode current collector portion 20. That is, the negative electrode tab-like portion 19 may have a coated portion that is a region where the negative electrode active material is applied and an uncoated portion that is a region where the negative electrode active material is not applied.
- the coating part of the positive electrode tab-shaped part 15 and the negative electrode tab-shaped part 19 is formed in the outer side (edge part side) rather than an uncoated part.
- the positive electrode active material layer 14 may be formed only on one side of the positive electrode metal foil 13.
- the negative electrode active material layer 18 may be formed only on one surface of the negative electrode metal foil 17.
- the positive electrode metal foil 13 may be an aluminum alloy foil.
- the negative electrode metal foil 17 may be a copper alloy foil.
- the vehicle on which the secondary battery 2 of the above embodiment is mounted may be an automobile or an industrial vehicle.
- the configuration of the above embodiment may be applied to another power storage device such as an electric double layer capacitor.
- the secondary battery 2 is not limited to a lithium ion secondary battery, and may be another type of secondary battery. In short, any ion may be used as long as ions move between the positive electrode active material layer and the negative electrode active material layer and transfer charge.
- the distances X1, X2, Y1, and Y2 are defined as the distances between specific lines. However, these distances X1, X2, Y1, and Y2 are defined as the distances between specific surfaces. May be. Specifically, when the width direction W1 of the layered portion 25 is a direction orthogonal to the direction in which the positive electrode current collector 16 and the negative electrode current collector 20 extend, it passes through the center of the layered portion 25 in the width direction W1.
- the virtual reference plane is used instead of the virtual reference line F1.
- the first virtual center plane passing through the center of the positive electrode current collector 16 in the width direction W2 is the first virtual center plane. Used in place of the virtual center line F2.
- the second virtual center plane passing through the center of the negative electrode current collector 20 in the width direction W3 is the second virtual center plane. Used in place of the virtual center line F3.
- the distance between the virtual reference plane and the first virtual central plane is X1, and the distance between the virtual reference plane and the second virtual central plane is Y1.
- first end portion distance is X2.
- second end distance between the virtual reference plane and the end face 17a is Y2.
- Each surface defined here may be a surface along the stacking direction of the electrode assembly 5.
- the distance between the first virtual connection center plane passing through the center of the positive electrode connection portion S1 and the virtual reference plane is X1
- the second virtual connection center plane and virtual reference plane passing through the center of the negative electrode connection portion S2 It is good also considering the distance between as Y1.
- the distance between the terminal end face 7c and the virtual reference plane may be X2
- the distance between the terminal end face 8c and the virtual reference plane may be Y2.
- the distances X3, X4, Y3, and Y4 in the different examples of FIGS. 10A to 10C may be defined as the distances between specific surfaces.
- distances X1 and Y1 in another example of FIG. 10D may be defined as distances between specific surfaces. Each surface defined here may be a surface along the stacking direction of the electrode assembly 5.
- first virtual connection center line F5 ... first 2 virtual connection center lines
- S1... Positive electrode connection portion S2... Negative electrode connection portion, W1, W2, W3... Width direction, X1, X2, X3, X4 ... distance, Y1, Y2, Y3, Y4.
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Abstract
Description
Claims (10)
- 正極電極と負極電極を両者の間を絶縁して積層した多層構造である電極組立体と、前記正極電極と電気を授受する正極端子と、前記負極電極と電気を授受する負極端子と、を備えた蓄電装置において、
前記正極電極は、正極用金属薄板と、前記正極用金属薄板に正極用活物質が塗布された正極活物質層とを備え、前記正極用金属薄板には前記正極用活物質が塗布されていない部分である正極集電部が設けられており、前記正極集電部は、前記正極端子との接続部である正極接続部を有するとともに前記正極電極の一端から延在しており、
前記負極電極は、負極用金属薄板と、前記負極用金属薄板に負極用活物質が塗布された負極活物質層とを備え、前記負極用金属薄板には前記負極用活物質が塗布されていない部分である負極集電部が設けられており、前記負極集電部は、前記負極端子との接続部である負極接続部を有するとともに前記負極電極の一端から延在しており、
前記電極組立体を積層方向から正面視したとき、幅方向を、前記正極集電部及び前記負極集電部の延在する方向に直交する方向と規定し、
前記幅方向において、前記正極活物質層と前記負極活物質層とが重なる領域である層状部の中央を通り、かつ前記正極集電部及び前記負極集電部の延在する方向に沿って延びる線を仮想基準線と規定し、
前記幅方向において、前記正極集電部の中央を通り、かつ前記正極集電部の延在する方向に沿って延びる線を第1仮想中央線と規定し、かつ、
前記幅方向において、前記負極集電部の中央を通り、かつ前記負極集電部の延在する方向に沿って延びる線を第2仮想中央線と規定した場合、
前記幅方向において、前記仮想基準線と前記第1仮想中央線との間の距離は、前記仮想基準線と前記第2仮想中央線との間の距離と異なっていることを特徴とする蓄電装置。 - 正極電極と負極電極を両者の間を絶縁して積層した多層構造である電極組立体と、前記正極電極からの電気を取り出す正極端子と、前記負極電極からの電気を取り出す負極端子と、を備えた蓄電装置において、
前記正極電極は、正極用金属薄板と、前記正極用金属薄板に正極用活物質を塗布した正極活物質層とを備え、前記正極用金属薄板には前記正極用活物質が塗布されていない部分である正極集電部が設けられており、前記正極集電部は、前記正極端子との接続部である正極接続部を有するとともに前記正極電極の一端から延在しており、
前記負極電極は、負極用金属薄板と、前記負極用金属薄板に負極用活物質を塗布した負極活物質層とを備え、前記負極用金属薄板には前記負極用活物質が塗布されていない部分である負極集電部が設けられており、前記負極集電部は、前記負極端子との接続部である負極接続部を有するとともに前記負極電極の一端から延在しており、
前記電極組立体において前記正極活物質層と前記負極活物質層とが重なる領域である層状部の幅方向を前記正極集電部及び前記負極集電部の延在する方向に直交する方向としたときに、前記層状部の幅方向における電極組立体の中央を前記正極集電部及び前記負極集電部の延在する方向に沿って延びる線を仮想基準線と規定し、
前記正極集電部の幅方向を前記正極集電部の延在する方向に直交する方向としたときに、前記正極集電部の幅方向における前記正極集電部の中央を前記正極集電部の延在する方向に沿って延びる線を第1仮想中央線と規定し、かつ、
前記負極集電部の幅方向を前記負極集電部の延在する方向に直交する方向としたときに、前記負極集電部の幅方向における前記負極集電部の中央を前記負極集電部の延在する方向に沿って延びる線を第2仮想中央線と規定した場合、
前記層状部の幅方向における前記仮想基準線と前記第1仮想中央線との間の距離は、前記層状部の幅方向における前記仮想基準線と前記第2仮想中央線との間の距離と異なっており、それにより前記電極組立体が非対称構造を有することを特徴とする蓄電装置。 - 正極電極と負極電極を両者の間を絶縁して積層した多層構造を有する電極組立体と、前記正極電極からの電気を取り出す正極端子と、前記負極電極からの電気を取り出す負極端子と、を備えた蓄電装置において、
前記正極電極は、正極用金属薄板と、前記正極用金属薄板に正極用活物質を塗布した正極活物質層とを備え、前記正極用金属薄板には前記正極用活物質が塗布されていない部分である正極集電部が設けられており、前記正極集電部は、前記正極端子との接続部である正極接続部を有するとともに前記正極電極の一端から延在しており、
前記負極電極は、負極用金属薄板と、前記負極用金属薄板に負極用活物質を塗布した負極活物質層とを備え、前記負極用金属薄板には前記負極用活物質が塗布されていない部分である負極集電部が設けられており、前記負極集電部は、前記負極端子との接続部である負極接続部を有するとともに前記負極電極の一端から延在しており、
前記電極組立体において前記正極活物質層と前記負極活物質層とが重なる領域である層状部の幅方向を前記正極集電部及び前記負極集電部の延在する方向に直交する方向としたときに、前記層状部の幅方向における前記電極組立体の中央を前記正極集電部及び前記負極集電部の延在する方向に沿って延びる線を仮想基準線と規定し、
前記正極集電部を構成している前記正極用金属薄板の部分のうち前記仮想基準線寄りに位置する端部を第1端部と規定し、かつ、
前記負極集電部を構成している前記負極用金属薄板の部分のうち前記仮想基準線寄りに位置する端部を第2端部と規定した場合、
前記層状部の幅方向における前記仮想基準線と前記第1端部との間の距離は、前記層状部の幅方向における前記仮想基準線と前記第2端部との間の距離と異なっており、それにより前記電極組立体が非対称構造を有することを特徴とする蓄電装置。 - 正極電極と負極電極を両者の間を絶縁して積層した多層構造を有する電極組立体と、前記正極電極からの電気を取り出す正極端子と、前記負極電極からの電気を取り出す負極端子と、を備えた蓄電装置において、
前記正極電極は、正極用金属薄板と、前記正極用金属薄板に正極用活物質を塗布した正極活物質層とを備え、前記正極用金属薄板には前記正極用活物質が塗布されていない部分である正極集電部が設けられており、前記正極集電部は、前記正極端子との接続部である正極接続部を有するとともに前記正極電極の一端から延在しており、
前記負極電極は、負極用金属薄板と、前記負極用金属薄板に負極用活物質を塗布した負極活物質層とを備え、前記負極用金属薄板には前記負極用活物質が塗布されていない部分である負極集電部が設けられており、前記負極集電部は、前記負極端子との接続部である負極接続部を有するとともに前記負極電極の一端から延在しており、
前記電極組立体において前記正極活物質層と前記負極活物質層とが重なる領域である層状部の幅方向を前記正極集電部及び前記負極集電部の延在する方向に直交する方向としたときに、前記層状部の幅方向における前記電極組立体の中央を前記正極集電部及び前記負極集電部の延在する方向に沿って延びる線を仮想基準線と規定し、
前記正極接続部の幅方向を前記正極集電部の延在する方向に直交する方向としたときに、前記正極接続部の幅方向における前記正極接続部の中央を前記正極集電部の延在する方向に沿って延びる線を第1仮想接続中央線と規定し、かつ、
前記負極接続部の幅方向を前記負極集電部の延在する方向に直交する方向としたときに、前記負極接続部の幅方向における前記負極接続部の中央を前記負極集電部の延在する方向に沿って延びる線を第2仮想接続中央線と規定した場合、
前記層状部の幅方向における前記仮想基準線と前記第1仮想接続中央線との間の距離は、前記層状部の幅方向における前記仮想基準線と前記第2仮想接続中央線との間の距離と異なっており、それにより前記電極組立体が非対称構造を有することを特徴とする蓄電装置。 - 正極電極と負極電極を両者の間を絶縁して積層した多層構造を有する電極組立体と、前記正極電極からの電気を取り出す正極端子と、前記負極電極からの電気を取り出す負極端子と、を備えた蓄電装置において、
前記正極電極は、正極用金属薄板と、前記正極用金属薄板に正極用活物質を塗布した正極活物質層とを備え、前記正極用金属薄板には前記正極用活物質が塗布されていない部分である正極集電部が設けられており、前記正極集電部は、前記正極端子との接続部である正極接続部を有するとともに前記正極電極の一端から延在しており、
前記負極電極は、負極用金属薄板と、前記負極用金属薄板に負極用活物質を塗布した負極活物質層とを備え、前記負極用金属薄板には前記負極用活物質が塗布されていない部分である負極集電部が設けられており、前記負極集電部は、前記負極端子との接続部である負極接続部を有するとともに前記負極電極の一端から延在しており、
前記電極組立体において前記正極活物質層と前記負極活物質層とが重なる領域である層状部の幅方向を前記正極集電部及び前記負極集電部の延在する方向に直交する方向としたときに、前記層状部の幅方向における前記電極組立体の中央を前記正極集電部及び前記負極集電部の延在する方向に沿って延びる線を仮想基準線と規定し、
前記正極接続部に接続された前記正極端子のうち前記仮想基準線寄りに位置する部分を第1端子端部と規定し、かつ、
前記負極接続部に接続された前記負極端子のうち前記仮想基準線寄りに位置する部分を第2端子端部と規定した場合、
前記層状部の幅方向における前記仮想基準線と前記第1端子端部との間の距離は、前記層状部の幅方向における前記仮想基準線と前記第2端子端部との間の距離と異なっており、それにより前記電極組立体が非対称構造を有することを特徴とする蓄電装置。 - 前記正極用金属薄板と前記負極用金属薄板は単位距離当りの抵抗が異なっており、2つの前記距離のうち、単位距離当りの抵抗が大きい金属薄板を有する電極に関する距離が、もう一方の電極に関する距離よりも短いことを特徴とする請求項1~請求項5のうち何れか一項に記載の蓄電装置。
- 前記仮想基準線は、前記電極組立体の積層方向において前記正極活物質層と前記負極活物質層とが重なる領域の幅方向を前記正極集電部及び前記負極集電部の延在する方向に直交する方向としたときに、前記領域の幅方向における電極組立体の中央を前記正極集電部及び前記負極集電部の延在する方向に沿って延びる線であることを特徴とする請求項1~請求項6のうち何れか一項に記載の蓄電装置。
- 前記正極集電部と前記負極集電部は、同一方向に延在していることを特徴とする請求項1~請求項7のうち何れか一項に記載の蓄電装置。
- 前記電極組立体は、複数の前記正極電極と複数の前記負極電極とを交互に積層して構成されていることを特徴とする請求項1~請求項8のうち何れか一項に記載の蓄電装置。
- 前記蓄電装置は、二次電池であることを特徴とする請求項1~請求項9のうち何れか一項に記載の蓄電装置。
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WO2014013992A1 (ja) * | 2012-07-17 | 2014-01-23 | 新神戸電機株式会社 | 二次電池の集電構造及び二次電池 |
JP5962530B2 (ja) * | 2013-02-06 | 2016-08-03 | トヨタ自動車株式会社 | 電池 |
JP5900538B2 (ja) | 2014-03-27 | 2016-04-06 | 株式会社豊田自動織機 | 蓄電装置 |
JP2018028963A (ja) * | 2014-12-26 | 2018-02-22 | 日立オートモティブシステムズ株式会社 | 角形二次電池 |
CN105990584A (zh) * | 2015-01-30 | 2016-10-05 | 松下蓄电池(沈阳)有限公司 | 铅蓄电池用板栅、极板、极板群和铅蓄电池 |
JP6451835B2 (ja) * | 2015-04-14 | 2019-01-16 | 株式会社村田製作所 | 蓄電デバイス |
JP6406440B2 (ja) * | 2015-04-15 | 2018-10-17 | 株式会社村田製作所 | 蓄電デバイス |
WO2016167156A1 (ja) | 2015-04-16 | 2016-10-20 | 株式会社村田製作所 | 積層蓄電デバイス |
KR102668193B1 (ko) * | 2016-01-04 | 2024-05-23 | 삼성에스디아이 주식회사 | 캡 조립체 및 이를 포함하는 이차 전지 |
KR102152069B1 (ko) * | 2016-03-31 | 2020-09-04 | 가부시키가이샤 도요다 지도숏키 | 축전 장치 |
JP7011044B2 (ja) * | 2018-03-28 | 2022-02-10 | 株式会社東芝 | 電池、電池パック、蓄電装置、車両及び飛翔体 |
JP7463930B2 (ja) * | 2020-09-30 | 2024-04-09 | トヨタ自動車株式会社 | 電池 |
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