WO2006114993A1

WO2006114993A1 - Electrode laminate and electric device

Info

Publication number: WO2006114993A1
Application number: PCT/JP2006/307099
Authority: WO
Inventors: Kazuaki Utsumi; Hiroshi Yageta
Original assignee: Nec Corporation
Priority date: 2005-04-22
Filing date: 2006-04-04
Publication date: 2006-11-02
Also published as: JPWO2006114993A1; JP5228482B2

Abstract

A film packing battery (1) comprises a plurality of cells (2) connected in series, and packing films (4, 5) for sealing them. The cell (2) is arranged such that a plurality of positive electrodes (21) and negative electrodes (24) are laid alternately in layers through separators (27). The positive electrodes (21) and negative electrodes (24) have metal foils (22, 25) coated with electrode materials (23, 26) such that the ends on either side become uncoated parts (22a, 25a). The positive and negative electrodes are laid by directing the uncoated parts (22a, 25a) to the opposite sides. Adjacent cells (2) are connected electrically while overlapping the uncoated part (22a) of the positive electrode (21) and the uncoated part (25a) of the negative electrode (24) alternately in the laying direction.

Description

Specification

Electrode laminate and electrical device

Technical field

TECHNICAL FIELD [0001] The present invention relates to an electrode laminate used for a chemical battery element, a capacitor element, and the like, and an electric device represented by a battery and a capacitor using the electrode laminate. Background art

[0002] For chemical batteries and capacitors, an electrode laminate in which a plurality of positive plates and a plurality of negative plates are alternately stacked via separators is hermetically sealed with an electrolyte and an exterior material such as metal or film. Hereinafter, the configuration is simply referred to as “sealing”. A positive electrode plate and a negative electrode plate (hereinafter simply referred to as an electrode plate when the positive electrode and the negative electrode are not distinguished from each other) are configured by applying an electrode material on both surfaces of a metal foil. In addition, electrode material is applied from the electrode plate to connect to the lead part for external lead! The metal foil part extends! /

[0003] Among electrical devices such as chemical batteries and capacitors, there is a strong demand for space saving in batteries used as power sources for mobile devices such as mobile phones, notebook computers, digital still cameras, and video cameras. ing. In addition, the development of electric vehicles and hybrid electric vehicles that use motors as a power source is rapidly progressing in response to increasing demands for resource saving and energy saving to protect the global environment. These electric vehicles are equipped with a battery for driving the motor. Batteries mounted on electric vehicles and the like are required to have high energy density and high output density in addition to being lighter and thinner.

In order to satisfy such a requirement, Japanese Patent Application Laid-Open No. 2003-257473 (Patent Document 1) discloses a battery module in which a plurality of single cells are arranged and connected in a plane. The single cell has one positive electrode in which the positive electrode material is applied to the central region on one side of the electrode plate serving as the positive electrode, and one negative electrode in which the negative electrode material is applied to the central region on one side of the electrode plate serving as the negative electrode. The positive electrode and the negative electrode are laminated so that the respective electrode materials face each other through the electrolyte, and the outer peripheral portion is sealed with an insulating material over the entire circumference in a region where the electrode material is not applied. The connection between the single cells is made by adjoining a plurality of single cells in a row so that the polarities of the electrode plates are different from each other, interposing a conductive paste between one electrode plate and the other electrode adjacent to each other. This is done by interposing an insulator between the plates. As a result, a plurality of single cells are connected in series. In the assembly to which the single cells are connected, the lead is connected to the positive electrode on one end side and the negative electrode on the other end side, respectively, and is sealed in the exterior material.

[0005] On the other hand, Japanese Patent Application Laid-Open No. 2003-187781 (Patent Document 2) discloses a battery module in which a plurality of battery elements are connected in series and the whole is sealed with an exterior material. The battery element has a structure in which a positive electrode and a negative electrode are laminated via a solid electrolyte. The positive electrode and the negative electrode have an electrode plate and an electrode material applied to a region excluding one end thereof, and are laminated so that the respective electrode material non-applied portions face in opposite directions. The positive electrode and negative electrode material non-applied portions are collected for each electrode, and their tips are joined together by welding or the like. The plurality of battery elements configured as described above are arranged in such a manner that the electrode material non-applied portion on the positive electrode side and the electrode material non-applied portion on the negative electrode side are arranged adjacent to each other, and these are overlapped and joined in series. Connected to.

[0006] However, the conventional battery module described above has the following problems.

[0007] The battery module disclosed in Patent Document 1 is performed on the end face of the electrode plate of the electrical connection force between the single cells. Therefore, the connection between single cells is a connection in an extremely unstable state that is easy to be separated when bending stress is applied to the battery module. As a result, it is difficult to ensure connection reliability between single cells.

[0008] Note that Patent Document 1 also discloses that at least one electrode plate on the positive electrode side and the negative electrode side is provided with an extending portion, and this extending portion is overlapped on the electrode plate of an adjacent single cell. Yes. According to this configuration, the thickness of the battery module is increased by the thickness of the force extending portion that can solve the above problem, which hinders thinning. The extension part is a part that does not contribute to charging / discharging, so we want to eliminate this increase in thickness if possible. Further, in order to achieve a larger capacity and a higher output with the configuration disclosed in Patent Document 1, a plurality of battery modules are stacked. In this case, since each battery module is sealed with the exterior material, the thickness of the exterior material that extends only by the extension portion is accumulated, which is further disadvantageous for thinning. .

[0009] In addition, as disclosed in Patent Document 1, a single cell in which an electrode plate also serves as a housing is used, an electrode plate in which an electrode material is applied only on one side must be used. You won't get. That Therefore, even if multiple single cells are stacked in order to obtain a large capacity or high voltage, when focusing only on the layered part of the electrode material and the electrode plate, the electrode plate coated with electrode material on both sides is stacked. In comparison with, the volume efficiency is reduced by the amount of overlap of the electrode plates.

[0010] On the other hand, the battery module disclosed in Patent Document 2 can obtain necessary capacity and output by appropriately setting the number of stacked positive electrodes and negative electrodes and the number of battery elements to be connected. However, in the battery module described in Patent Document 2, the electrical connection between the battery elements is made by superimposing the integral parts, which are the parts where the electrode material non-coated parts of the electrode plate are gathered together. Is going by. For this reason, the battery module described in Patent Document 2 has a limitation when viewed from the viewpoint of reducing the overall planar dimensions. In Patent Document 2, an electrode plate coated with electrode material on both sides is used. In that respect, if attention is paid only to the laminated portion of the electrode material and the electrode plate, the volume is larger than that disclosed in Patent Document 1. Efficiency is high. However, for the following reasons, volumetric efficiency loss still existed elsewhere.

[0011] The area of the battery element where the portions where the positive electrode and negative electrode electrode materials are applied are opposed to each other (hereinafter also referred to as a laminated portion). This is a region that does not contribute to connection with adjacent battery elements. Therefore, from the viewpoint of reducing the planar dimensions, it is preferable that the integral flange portion is as close as possible to the laminated portion. On the other hand, the following must also be taken into account when determining the distance to the laminating force unit.

[0012] In the stacked portion, the battery element has a total thickness including the thickness of each substrate, the thickness of the electrode material applied to each substrate, and the thickness of the solid electrolyte between the substrates. On the other hand, the thickness of the integral part has a total thickness of only the substrates of the respective poles. Therefore, the electrode material non-applied portion is collected in a curved shape so as to reduce the overall thickness as it goes from the laminated portion to the integral portion.

[0013] A substrate to which the electrode material is applied is generally a metal foil. Further, if the distance from the laminated portion to the integrated portion is the same, the greater the total number of stacked positive electrodes and negative electrodes, the greater the angle of curvature of the electrode material non-coated portion with respect to the laminated portion. Therefore, for example, the thickness of each of the positive electrode and the negative electrode is 60 m or more, and the total number of laminated sheets When the number is 30 or more, the angle of curvature of the electrode material non-applied portion becomes too large, and the metal foil may break. Therefore, it is necessary to relax the curvature of the non-coated portion of the electrode material to such an extent that the metal foil does not break. For this purpose, it is necessary to separate the integrated part from the laminated part as much as possible, which leads to an increase in the size of the part that does not contribute to charge / discharge. In other words, in the conventional configuration, if the problem of breaking the metal foil is taken into consideration, as a result, downsizing of the planar dimensions is limited.

Disclosure of the invention

[0014] The present invention has been made in view of the conventional problems described above, and is flexible to increase the capacity and output while minimizing the size of the portion that does not contribute to the accumulation of electric energy. An object of the present invention is to provide an electrode laminate and an electric device that can be used.

[0015] In order to achieve the above object, an electrode laminate of the present invention is an electrode laminate in which electric energy is accumulated, and a plurality of positive electrodes and a plurality of negative electrodes are alternately laminated via an electrolyte. A plurality of cells. The positive electrode and the negative electrode have a sheet-like metal member coated with an electrode material so that one end portion is a non-coated portion, and the non-coated portion of the positive electrode and the non-coated portion of the negative electrode protrude toward opposite sides. Are stacked. The plurality of cells are arranged with the non-coated portion of the positive electrode and the non-coated portion of the negative electrode facing each other, and between the cells adjacent to each other, a part of the non-coated portion of the positive electrode of one cell and the non-coated portion of the other cell are arranged. A part of the non-coated portion of the negative electrode and the force are electrically connected in an overlapping manner in the stacking direction of the positive electrode and the negative electrode.

[0016] In the electrode laminate of the present invention configured as described above, the non-coated portions of adjacent cells are alternately overlapped and electrically connected. In this way, by arranging the plurality of cells by alternately overlapping the non-coated portions of adjacent cells, the curvature of the non-coated portion is reduced, so that the cells can be arranged closer to each other. As a result, the limitation on the number of stacked positive and negative electrodes is eased.

[0017] The electrolyte may be an electrolytic solution, a solid electrolyte, or a polymer electrolyte. When the electrolyte is an electrolyte, the electrolyte in one cell belongs to the other cell between the separators impregnated with the electrolyte disposed between the stacked positive and negative electrodes and the cells adjacent to each other It is preferable to further include a sealing material that prevents contact with the battery working member. In addition, between the cells adjacent to each other, the non-coated portion of the positive electrode and the non-coated portion of the negative electrode By having a fixed conductive member in between, and the positive electrode and the negative electrode are electrically connected by the conductive member, the curvature of the non-applied portion is further alleviated.

[0018] The electrical device of the present invention is electrically connected to the non-coated portion of the positive electrode and the non-coated portion of the negative electrode at both ends in the arrangement direction of the plurality of cells of the electrode stacked body of the present invention. A positive electrode tab and a negative electrode tab, and an exterior material that extends the tab and seals the electrode laminate. Thus, by having the electrode laminate of the present invention described above, an electric device is achieved in which cells are arranged closer together and the limitation on the number of stacked positive and negative electrodes is relaxed. .

In the present invention, the “battery acting member” means a member having a potential due to a battery action, such as an electrode material, a sheet-like metal member coated with the electrode material, and an electrolyte. Not included.

[0020] According to the present invention, it is possible to improve the arrangement efficiency of the positive electrode and the negative electrode by connecting a plurality of cells by alternately overlapping the non-coated portions of the positive electrode and the negative electrode adjacent in the stacking direction. Further, the limit of the number of layers of the positive electrode and the negative electrode can be relaxed.

Brief Description of Drawings

FIG. 1 is an exploded perspective view of a film-clad battery that is an electrical device according to an embodiment of the present invention.

2 is a schematic cross-sectional view of the film-clad battery shown in FIG. 1 along the cell arrangement direction.

FIG. 3 is a schematic cross-sectional view along the cell arrangement direction of a film-clad battery according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a connection portion between cells of a film-clad battery, showing a modification of the conductive member used in the present invention.

FIG. 5A is a cross-sectional view of a connection portion between cells of a film-clad battery, showing another example of a conductive member used in the present invention.

FIG. 5B is a cross-sectional view of the film-clad battery cut along the line BB shown in FIG. 5A.

FIG. 5C is a cross-sectional view of the film-clad battery cut along the CC line shown in FIG. 5A.

[FIG. 6] A film-clad battery showing still another modification of the conductive member used in the present invention. It is sectional drawing of the connection part between cells.

FIG. 7 is a view showing a modification of the control terminal used in the present invention.

Explanation of symbols

[0022] 1 film-clad battery

2 cells

3a Positive tab

3b Negative electrode tab

4, 5 Exterior film

6, 26, 36 Conductive member

6a, 39 Control terminal

7, 32, 38 Sealing material

twenty one

22 Metal foil for positive electrode

22a, 25a Unapplied part

23 Cathode active material

24 Negative electrode

25 Metal foil for negative electrode

26 Negative electrode active material

27 Separator

37 Solid electrolyte

BEST MODE FOR CARRYING OUT THE INVENTION

[0023] Referring to FIG. 1 and FIG. 2, the present invention has an electrode laminate including a plurality of positive electrodes 21 and a plurality of negative electrodes 24, and exterior films 4 and 5 that seal the electrode laminate together with an electrolyte. A film-clad battery 1 according to one embodiment is shown. The positive electrode 21 and the negative electrode 24 are alternately laminated so that the electrode laminate can accumulate the electric energy and discharge the accumulated electric energy to the outside. The electrode stack has a plurality of cells 2 (three in this embodiment) arranged in a line and connected in series. In the arrangement direction of the cell 2, the positive electrode tab 3a is connected to the positive electrode 21 of the cell 2 located on one end side, and the other end A negative electrode tab 3b is connected to the negative electrode 24 of the cell 2 located on the side. The positive electrode tab 3a and the negative electrode tab 3b are connected with their tip portions protruding from the outer films 4 and 5, respectively, and are used to electrically connect the film outer battery 1 to an external device.

[0024] The exterior films 4 and 5 have a planar dimension larger than that of the electrode laminate, and surround the electrode laminate from both sides in the thickness direction (the laminate direction of the positive electrode 21 and the negative electrode 24). is doing. As a result, the exterior films 4 and 5 overlap each other around the electrode laminate, and the overlapping opposing surfaces are heat-sealed to seal the electrode laminate. One exterior film 4 has a cup portion 4a formed in the central region in order to form a space surrounding the electrode laminate. The exterior films 4 and 5 are heat-sealed over the entire circumference of the cup portion 4a. The cup portion 4a can be processed by deep drawing. In this embodiment, the force of forming the cup portion 4a only on one of the exterior films 4 may be formed on each of the exterior films 4 and 5, or the flexibility of the exterior films 4 and 5 without forming the cup portion. You can use to surround the electrode stack.

[0025] As the exterior films 4 and 5, a laminate film can be preferably used. As the laminate film constituting the exterior films 4 and 5, various films can be used as long as they have flexibility and can seal the electrode laminate together with the electrolyte. Typically, a heat-sealing layer made of heat-fusible resin, a strong non-breathing layer such as a metal thin film, and a protective layer made of a film of polyester or nylon such as polyethylene terephthalate are laminated in this order. Is mentioned. The exterior films 4 and 5 are provided with a protective layer as needed as long as they have at least a heat-sealing layer and a non-air-permeable layer. When sealing the electrode laminate, the electrode laminate is surrounded with the heat-sealing layer facing each other.

[0026] As the metal thin film constituting the non-breathing layer, for example, a foil of Al, Ti, Ti alloy, Fe, stainless steel, Mg alloy or the like having a thickness of 10 to: LOO / zm can be used. As the resin constituting the heat-sealing layer, for example, polypropylene, polyethylene, these acid-modified products, polyester such as polyethylene terephthalate, polyethylene terephthalate, polyamide, ethylene acetate butyl copolymer, ionomer, etc. can be used. .

In addition to the metal thin film, an inorganic insulator such as silicon oxide or acid aluminum can be used as the gas-impermeable layer as long as it has gas permeability. This embodiment Thus, when storing multiple cells 2 connected in series in one exterior body, electrolytes with different potentials will be stored. Even if the electrolytic solution and the non-venting layer come into contact with each other, it is possible to prevent a short circuit between the cells. In the case of a nonaqueous electrolyte battery, a non-venting layer is necessary, but in other cases, the non-venting layer is not necessarily required.

[0028] The thickness of the heat-sealing layer is preferably 10 to 200 µm, and more preferably 30 to LOO µm, for good sealing of the electrode laminate.

[0029] As described above, the electrode stack includes three cells 2 connected in series. Cell 2 is described in detail below with reference to FIG.

[0030] Cell 2 includes a plurality of positive electrodes 21 and a plurality of negative electrodes 24, with separators 27 interposed between each positive electrode 21 and each negative electrode 24, and negative electrode 24 positioned on the uppermost surface and the lowermost surface. In addition, it has a structure in which layers are alternately stacked.

[0031] The positive electrode 21 has a positive electrode metal foil 22 that is a sheet-like metal member, and a positive electrode active material 23 applied to both surfaces thereof. The positive electrode active material 23 is applied to a region excluding one end portion of the positive electrode metal foil 22, and one end portion of the positive electrode 21 where the positive electrode active material 23 is not applied is an uncoated portion 22a. The negative electrode 24 has a negative electrode metal foil 25 that is a sheet-like metal member, and a negative electrode active material 26 applied to both surfaces thereof. The negative electrode active material 26 is applied to a region excluding one end portion of the negative electrode metal foil 25, and the negative electrode active material 26 of the negative electrode 24 is applied, and one end portion becomes an uncoated portion 25a. The

[0032] In each cell 2, the positive electrode 21 and the negative electrode 24 have their respective non-coated portions 22a and 25a facing away from each other, and the positive electrode active material 23 and the negative electrode active material 26 are interposed via the separator 27. They are stacked so as to face each other. Therefore, in each cell 2, the non-coated portion 22a of the positive electrode 21 protrudes from one end of the electrode laminate portion where the positive electrode active material 23 and the negative electrode active material 26 are laminated via the separator 27, and the other end force is also The non-coated part 25a of the negative electrode 24 is projected.

In FIG. 2, the positive electrode 21 and the separator 27, and the negative electrode 24 and the separator 27 are shown as being spaced apart from each other. It is. Fig. 2 simply shows an example of the connection structure of each cell 2 and the laminated structure of each cell 2. The number of cells 2 and the number of positive electrodes 21 and negative electrodes 24 in each cell 2 are not limited to those shown in FIG.

[0034] Of each cell 2, two cells 2 located at both ends are gathered in the laminating direction on one side, and the non-coated portions 22a of the positive electrode 21 are collectively connected to the positive electrode tab 3a on the other side. In this case, the non-coated portions 25a of the negative electrode 24 are gathered in the stacking direction and collectively connected to the negative electrode tab 3b. The connection between the non-coated portion 22a of the positive electrode 21 and the positive electrode tab 3a and the connection between the non-coated portion 25a of the negative electrode 24 and the negative electrode tab 3b can be performed by, for example, ultrasonic welding.

[0035] The cell 2 includes the non-applied portion 22a of the positive electrode 21 and the negative electrode 24 in relation to the adjacent two cells 2 so that the non-applied portion 22a of the positive electrode 21 and the non-applied portion 25a of the negative electrode 24 face the same direction. They are arranged in a row with the non-application part 25a facing each other. Between two adjacent cells 2, the non-applied part 25 a of the negative electrode 24 of the other cell 2 enters between the non-applied part 22 a of the positive electrode 21 of one cell 2. That is, between two adjacent cells, a part of the non-coated part 22a of the positive electrode 21 of one cell and a part of the non-coated part 25a of the negative electrode 24 of the other cell 2 are connected to the positive electrode 21 and the negative electrode. 24 and are stacked alternately in the stacking direction.

[0036] Between adjacent two cells 2, between the overlapping portions of the non-applied portion 22a of the positive electrode 21 and the non-applied portion 25a of the negative electrode 24, a block-shaped or bar-shaped conductive member is provided. 6 is arranged. The non-coating portions 22a and 25a are electrically connected by these conductive members 6, whereby a plurality of cells 2 are connected in series.

[0037] Each cell 2 holds an electrolytic solution as an electrolyte. When a plurality of cells 2 are connected in series, if the electrolyte can freely flow between the cells 2, the cells 2 are not in a normal series connection state such as a short circuit. Therefore, a sealing material 7 is provided between the adjacent cells 2 so that the electrolyte in one cell 2 does not come into contact with the members constituting the other cell 2 between the two adjacent cells 2. It has been. Specifically, in the sealing material 7, between the two adjacent cells 2, the non-applied portions 22a and 25a and the conductive member 6 connected thereto are not exposed to the electrolyte storage portion of the adjacent cell 2. As described above, the gaps between the non-coated portions 21a of the positive electrode 21 and the gaps between the non-coated portions 24a of the overlapping negative electrodes 24 are filled. As a result, the electrolyte is individually held for each cell 2. [0038] Materials such as positive electrode 21, negative electrode 24, and electrolyte solution are laminated

In the present embodiment, for example, according to the type of the film-clad battery 1, it is appropriately selected. The type of film-clad battery 1 is not particularly limited Lithium ion secondary battery, lithium metal primary or secondary battery, non-aqueous electrolyte battery such as lithium polymer battery, nickel metal hydride battery, nickel cadmium battery, lead acid battery, etc. There are various chemical batteries such as water-based batteries.

[0039] For example, in the case of a lithium ion secondary battery, the positive electrode 21 is an aluminum foil having a thickness of 3 to 50 m using a lithium-manganese composite oxide, lithium cobalt oxide or the like as the positive electrode active material 23 and the metal foil 22 for the positive electrode. Can be used. For the negative electrode 24, a carbon material that can be doped and dedoped with lithium as the negative electrode active material 26, and a copper foil with a thickness of 3 to 50 m can be used as the metal foil 25 for the negative electrode. In this case, an electrolytic solution containing a lithium salt can be used as the electrolytic solution. The conductive member 6 can be made of a metal that can be bonded to both aluminum and copper, for example, nickel that can be ultrasonically welded to aluminum and copper. Also, iron, stainless steel, copper, nickel-plated or tin-plated V, etc. Methods for connecting the conductive member 6 to the positive electrode metal foil 22 or negative electrode metal foil 25 include contact, welding, force squeezing, screwing, fitting, sandwiching, soldering, and using a conductive adhesive. This method can be used.

[0040] Furthermore, when an aluminum foil is used for the positive electrode metal foil 22, an aluminum plate can be used for the positive electrode tab 3a. When a copper foil is used for the negative electrode metal foil 25, a negative electrode tab is used. A copper plate can be used for 3b. When the negative electrode tab 3b is formed of a copper plate, the surface thereof may be plated with nickel.

[0041] The separator 27 and the sealing material 7 are appropriately selected in accordance with the required function regardless of the type of the film-clad battery 1. As the separator 27, a sheet-like member that can be impregnated with an electrolytic solution, such as a microporous film (microporous film), a nonwoven fabric, or a woven fabric made of thermoplastic resin such as polyolefin can be used. .

[0042] As the sealing material 7, various materials capable of blocking the electrolytic solution can be used. However, the sealing material 7 prevents the electrolytic solution of one cell 2 from being in electrical contact with the battery operating member belonging to the other adjacent cell 2, and the electrolytic solution does not leak between the cells. Thus, the ability to adhere well to the non-applied portions 22a and 25a is required. Considering this, it is preferable to use a metal-adhesive resin for the sealing material 7. Examples of the metal-adhesive resin include acid-modified polyethylene such as acid-modified polyethylene and acid-modified polypropylene, ethylene acetate butyl copolymer, and ionomer, in addition to acrylate polymer, metal acrylate polymer, and urethane. Polar polymers such as polymer, epoxy polymer, polyester, polyamide, and polyvinylidene fluoride polymer. Further, the sealing material 7 can be formed of a hot melt adhesive or can be formed by pouring a two-component curable adhesive. In the figure, the sealing material 7 has a columnar shape that is long in the stacking direction, but it may be a flat plate or a film with the main surface facing in the stacking direction. In addition, in order to improve the adhesion to the sealing material 7 on the entire surface or a portion where the sealing material 7 is adhered to at least one of the positive electrode metal foil 22 and the negative electrode metal foil 25, or in the vicinity thereof. The surface treatment may be performed. Such surface treatments include chromium-based treatment, zirconium-based treatment, phosphoric acid-based treatment, oxide film treatment, hydroxide film treatment and other film-based treatments, partially aminated phenolic resin-based treatments, and silane coupling. And organic treatments such as chemicals and titanate coupling agents, and surface roughening by chemical etching or polishing.

[0043] As described above, in the film-clad battery 1 of the present embodiment, between the two cells 2 connected in series, the positive electrode 21 of one cell 2 and the negative electrode 24 of the other cell 2 are not connected to each other. The coating parts 22a and 25a are alternately overlapped and connected with the conductive member 6 interposed therebetween. As a result, the positive electrode 21 of one cell 2 and the negative electrode 24 of the other cell 2 can be connected in a state where the curvature of the non-applied portions 22a and 25a is greatly relaxed.

[0044] Therefore, in the arrangement direction of the cells 2, the root of the non-applied part 22a of the positive electrode 21 (boundary with the applied part of the positive electrode active material 23) is also connected to the non-applied part 25a of the negative electrode 24 (conductive member). 6) and the base of the non-coated portion 25a of the negative electrode 24 (boundary with the coated portion of the negative electrode active material 26) force is also connected to the non-coated portion 22a of the positive electrode 21 (conductive member). The distance B up to the connecting portion with 6) can be greatly reduced as compared with the conventional case where the metal foil for positive electrode 22 and the metal foil for negative electrode 25 are not broken. In addition, the dimension C in the arrangement direction of the cells 2 in the area where the non-coated part 22a of the positive electrode 21 and the non-coated part 25a of the negative electrode 24 overlap is the minimum dimension required to connect the cells 2 to each other. It can be. As a result, the negative electrode 24 is not applied from the base of the non-applied portion 22a of the positive electrode 21 in the relationship between the positive electrode 21 and the negative electrode 24 connected to each other, which is a portion that does not contribute to charge / discharge of the electrode laminate. The distance L to the root of part 25a can be greatly reduced compared to the conventional method. As a result, the planar dimensions of the electrode laminate without reducing the performance as the film-clad battery 1 can be reduced. Furthermore, the effect of greatly reducing the planar dimensions of the parts that do not contribute to charging / discharging can be said at all the connections between adjacent cells 2, so a larger number of cells 2 are connected in series to obtain a higher voltage. This is more effective when connected electrode stacks are used.

[0046] Further, since the adjacent cells 2 can be connected in a state where the curvature of the non-applied portions 22a and 25a is greatly relaxed as described above, the positive electrode 21 and the negative electrode 24 Even when the number of laminated layers is further increased, the positive electrode metal foil 22 and the negative electrode metal foil 25 are unlikely to break. In particular, in the present embodiment, since the conductive member 6 is interposed between the non-applied portion 22a of the positive electrode 21 and the non-applied portion 25a of the negative electrode 24 that overlap each other, the non-applied portions 22a and 25a are hardly curved. be able to. If the thickness of the conductive member 6 in the laminating direction is made equal to the distance between the positive electrode metal foil 22 and the negative electrode metal foil 25 facing each other with the separator 27 therebetween, the non-coated portion 22a and the negative electrode 24 of the positive electrode 21 It is possible to connect the cell 2 without bending the non-application part 25a. Specifically, this means that the thickness of the conductive member 6, the thickness of one separator 27, the coating thickness of the positive electrode active material 23 for one side of the positive electrode metal foil 22, and the negative electrode metal foil The thickness of the negative electrode active material 26 for one side of 25 is the same as the total thickness. In this case, the maximum number of stacked layers of the positive electrode 21 and the negative electrode 24 is not particularly limited as long as it is within a practical range. Here, since the separator 27 is impregnated with the electrolytic solution, the above-mentioned “opposite the separator 27 in between” is synonymous with “opposite the electrolyte in between!”. . Further, “the thickness of one separator 27” is synonymous with “the thickness of the electrolyte disposed between the positive electrode and the negative electrode”.

[0047] Furthermore, the film-clad battery 1 of the present embodiment has a control terminal 6a electrically connected to the connecting portion between the positive electrode 21 and the negative electrode 24 between the adjacent cells 2. A member similar to the conductive member 6 can be used for the control terminal 6a. The control terminal 6a is joined to the non-coated part 25a of the negative electrode 24 at the uppermost position in the laminating direction, and the tip thereof is outside the exterior film 4. Protruding to

[0048] In a battery in which a plurality of cells 2 are connected, in order to effectively exhibit the performance of each cell 2, it is desirable that the voltage of each cell 2 is equal. However, depending on the performance variation of each cell 2 itself and the charge / discharge conditions, the voltage may vary from cell 2 to cell 2.

Therefore, by providing the control terminal 6a as in the present embodiment, the control terminal 6a, the positive electrode tab 3a, and the negative electrode tab 3b can be obtained even in the film-clad battery 1 in which a plurality of cells 2 are sealed. Can be used to check the voltage of each cell 2. If the voltages of the cells 2 are different, the cells 2 can be individually charged or discharged so that the voltages of the cells 2 are equal. As a result, the performance of the film-clad battery 1 can be maintained satisfactorily. However, if individual control for each cell 2 is not required, the control terminal 6a may not be provided.

[0050] In the present embodiment, the force conductive member 6 in which the conductive member 6 is disposed between the non-application portions 22a and 25a in the connection portion between the cells 2 is not necessarily required. As described above, in the connection part between the cells 2, the non-application part 22a of the positive electrode 21 and the non-application part 25a of the negative electrode 24 are alternately arranged in the stacking direction. When the conductive member 6 is not disposed, the non-coated portion 22a of the positive electrode 21 and the non-coated portion 25a of the negative electrode 24 are gathered in the stacking direction and directly joined at the connection portion of the cells 2 and the like. In this state, the non-coated portion 25a of the negative electrode 24 of the adjacent cell 2 is interposed between the non-coated portions 22a of the positive electrode 21 adjacent in the stacking direction, and the non-coated portion of the negative electrode 24 adjacent in the stacking direction is not. The non-application part 22a of the positive electrode 21 of the adjacent cell 2 is interposed between the application parts 25a.

[0051] As a result, in the region where the non-applied portion 22a of the positive electrode 21 and the non-applied portion 25a of the negative electrode 24 are joined, the lower surface force of the lowermost non-applied portion 22a in the stacking direction is also the highest non-coated portion. The distance to the upper surface of the cloth portion 22a and the distance from the lower surface of the lowermost non-application portion 25a to the upper surface of the uppermost non-application portion 25a are the same as the conventional non-application portions 22a, This is about twice as much as when 25a are collected and joined. Therefore, even when the non-coated portion 22a of the positive electrode 21 and the non-coated portion 25a of the negative electrode 24 are directly joined without the conductive member 6, the bending of the non-coated portions 22a and 25a is reduced compared to the conventional case, The planar dimension of the part that does not contribute to charge / discharge can be reduced. [0052] Even when the conductive member 6 is not provided, the control terminal 6a may be provided as described above to charge / discharge each cell 2 individually.

FIG. 3 shows a schematic cross-sectional view similar to FIG. 2, of a film-clad battery according to another embodiment of the present invention. 3, parts similar to those in FIG. 2 are given the same reference numerals as those in FIG. 2, and descriptions thereof are omitted.

[0054] The film-clad battery of this embodiment is different from the above-described embodiment in that a solid electrolyte 37 is used as an electrolyte instead of an electrolyte. As the solid electrolyte 37, various kinds of solid electrolytes can be used as long as they do not contain a free solvent but can conduct ions. For example, an oxide-based inorganic compound such as j8 alumina and a polymer bridge such as polyethylene oxide can be used. Examples include bridges and non-cross-linked ones. In the same way as the separator 27 (see FIG. 2), the solid electrolyte 37 includes a region where the positive electrode active material 23 of the positive electrode 21 is applied and a negative electrode 24 so that the positive electrode active material 23 and the negative electrode active material 26 do not directly contact each other. The negative electrode active material is larger than the region where the negative electrode active material is applied and has a planar dimension.

[0055] By using the solid electrolyte 37 in this manner, the movement of ions is limited only between the positive electrode 21 and the negative electrode 24 facing each other with the solid electrolyte 37 interposed therebetween, and the movement of ions between the cells 2 is eliminated. Therefore, the sealing material 7 as shown in FIG. 2 is not necessary. Since the sealing material 7 is not required, the structure of the film-clad battery is simplified. Furthermore, the distance A and the distance B shown in FIG. As a result, it is possible to further reduce the planar dimensions of the electrode laminate, and hence the film exterior battery, while maintaining the configuration of the portion that contributes to charging and discharging.

Note that the conductive member 6 and the control terminal 6a are not necessarily provided, as in the above-described embodiment. In addition, the number of cells 2 in the electrode stack and the number of positive electrodes 21 and negative electrodes 24 in each cell are not limited to those shown in the figure, as in the above-described embodiment.

In the present embodiment, the solid electrolyte 37 is used as the electrolyte, but a polymer electrolyte can be used instead of the solid electrolyte 37. As the polymer electrolyte, various polymers can be used as long as they contain a solvent in a polymer matrix and the liquid does not bleed out. For example, an ion-conducting solvent can be used inside a cross-linked polyethylene oxide. But Examples thereof include a mixture of a crosslinked or non-crosslinked polyvinylidene fluoride polymer and an electrolytic solution.

As described above, when the solid electrolyte 37 or the polymer electrolyte is used as the electrolyte as in the present embodiment, the sealing material is unnecessary. However, in the present invention, when a liquid electrolyte is an electrolyte that can exude, such as a composite of a solid electrolyte and a liquid electrolyte, or a composite of a polymer electrolyte and a liquid electrolyte, such an electrolyte is an “electrolyte”. Included in the concept.

Next, modified examples applicable to each of the above-described embodiments will be shown. In each embodiment, the force in which the conductive member 6 is interposed between all the non-applied portions of the positive electrode metal foil 22 and the negative electrode metal foil 25 facing each other. A configuration may be adopted in which the connection and the connection by the conductive member 6 are alternately repeated. In such a configuration, for example, an electrode pair in which one positive electrode metal foil 22 and one negative electrode metal foil 25 are welded at their non-applied portion is prepared in advance, and the electrode pair is formed on the welded portion. It is possible to repeatedly form the conductive member 6 and further place the welded portion of another electrode pair thereon. In this case, the thickness of the positive electrode 21, the thickness of the negative electrode 24, and the thickness of the electrolyte (the separator 27 impregnated with the electrolytic solution or the solid electrolyte 37) between the positive electrode 21 and the negative electrode 24 facing each other in the stacking direction. It is preferable to use the conductive member 6 having a thickness (hereinafter referred to as “unit stacking cycle thickness” t) which is twice the thickness of the thickness.

[0060] In addition, in the above-described embodiment, the conductive member has a structure in which a plurality of conductive members having a predetermined thickness are stacked through the non-applied portion of the electrode metal foil. The following configuration is also conceivable.

The first example is a configuration in which one conductive member continuous in the electrode stacking direction is used, and the positive electrode and the negative electrode are alternately connected to the conductive member at intervals. Figure 4 shows a specific example. In FIG. 4, the conductive member 26 has a wave shape so as to sew between the non-coated portion of the positive electrode metal foil 22 of one cell and the non-coated portion of the other cell negative electrode metal foil 25 adjacent thereto. It is made of a metal sheet that is bent and extends in the stacking direction of the positive electrode metal foil 22 and the negative electrode metal foil 25. The conductive member 26 is bent so that portions parallel to the in-plane direction of the positive electrode metal foil 22 and the negative electrode metal foil 25 are formed. As a result, on both sides of the conductive member 26, The concave portions 26a into which the non-coated portions of the positive electrode metal foil 22 of one cell enter and the concave portions 26b into which the non-coated portions of the negative electrode metal foil 25 of the other cell enter are alternately formed. The non-applied portion is welded to the conductive member 26 in the recesses 26a and 26b of the conductive member 26, whereby the positive electrode metal foil 22 and the negative electrode metal foil 25 are electrically connected to the conductive member 26. In this case, it is preferable that the period of the waveform of the conductive member 26 is a unit lamination period thickness.

FIG. 4 shows the case where the electrolyte is an electrolytic solution. However, when the electrolyte is a solid electrolyte or a polymer electrolyte, the sealing material 7 is not necessary.

[0063] The second example is an example in which the above-described metal sheet is a composite metal sheet in which two different types of metal layers are laminated. Specific examples thereof will be described with reference to FIGS. 5A to 5C. In FIGS. 5B and 5C, the conductive member is shown as a single layer for simplification!

[0064] As shown in FIG. 5A, the conductive member 36 is between the non-applied portion of the positive electrode metal foil 22 of one cell and the non-applied portion of the negative electrode metal foil 25 of the other cell adjacent thereto. The metal sheet is bent in a wave shape and is bent in a wave shape so as to extend in the stacking direction of the positive electrode metal foil 22 and the negative electrode metal foil 25. The metal sheet used for the conductive member 36 is a composite metal sheet in which a first metal layer 36a and a second metal layer 36b are laminated in a state where they can conduct each other.

[0065] The first metal layer 36a and the second metal layer 36b also have different metal forces. The conductive member 36 has the first metal layer 36a directed to the side where the positive electrode metal foil 22 of one cell is connected, and the second metal layer 36b is connected to the negative electrode metal foil 25 of the other cell. It is arranged toward the side. The bending shape of the conductive member 36 and the electrical connection between the metal foils 22 and 25 and the conductive member 36 are the same as in the example shown in FIG.

As shown in FIGS. 5B and 5C, the sealing material 32 is disposed between the conductive member 36 and the exterior film 35 so as to surround the entire outer periphery of the conductive member 36. The outer surface of the sealing material 32 is bonded to the exterior film 35 over the entire periphery, and the inner surface of the sealing material 32 is bonded to the conductive member 36 over the entire periphery. As a result, a liquid-tight partition is formed by the conductive member 36 and the sealing material 32. As a result, even when the electrolyte is an electrolytic solution, mutual inflow of the electrolytic solution between adjacent cells is prevented. As the material of the sealing material 32, various materials as described above can be used as long as they can block the electrolytic solution. [0067] As described above, the sealing member 32 is provided between the conductive member 36 and the exterior film 35 so as to surround the periphery of the conductive member 36, thereby being disposed between the overlapping metal foils described above. It is not necessary to provide each layer individually as in the case of the sealing material 7 (see Fig. 2). As a result, the number of parts and the number of manufacturing steps can be reduced. The configuration of the sealing material 32 shown in FIG. 5B can also be applied to each example described above.

[0068] When the electrolyte is a solid electrolyte or a polymer electrolyte, it is not necessary to provide a sealing material. However, as described above, an electrolyte from which a liquid electrolyte can bleed is considered as an electrolytic solution.

[0069] In the above configuration, as the "battery action member" in the present invention, the first metal layer 36a is a battery action member belonging to the cell on the side to which the positive electrode metal foil 22 is connected. The metal layer 36b is a battery operation part belonging to the cell on the side to which the negative electrode metal foil 25 is connected.

[0070] As the first metal layer 36a, A or Ti is preferable. The second metal layer 36b is preferably Ni, Cu, Fe, or stainless steel. Each metal layer 36a, 36b need not be composed of a single metal, for example, the second metal layer 36b can be composed of Ni-plated Cu or Ni-plated Fe. . Further, a surface treatment for improving the adhesion to the sealing material 32 may be applied to the entire surface of the conductive member 36 or in the vicinity of the bonding portion with the sealing material 32. Such surface treatments include chromium-based treatment, zirconium-based treatment, phosphoric acid-based treatment, oxide film treatment, hydroxide film treatment and other film-based treatments, partially aminated phenolic resin-based treatments, silane coupling agents, titanates. And organic treatments such as coupling agents.

[0071] The method of laminating the first metal layer 36a and the second metal layer 36b is not particularly limited as long as the two metal layers 36a and 36b are laminated so that they can conduct, and a clad method, welding, and a conductive adhesive are used. Adhesion, crimping, force squeezing, and squeezing can be used. Alternatively, an assembly in which the first metal layer 36a bent in a wave shape is connected to the non-coated portion of the positive electrode metal foil 22 in one cell and the second metal foil 36b bent in a wave shape in the negative electrode of the other cell. Alternatively, the assembly connected to the non-coated portion of the metal foil 25 may be made separately, and the metal layers 36a and 36b may be joined together by corrugating the corrugations. [0072] The first metal layer 36a and the second metal layer 36b are electrically connected even if they are brought into contact with each other. In order to obtain a better conduction state, it is preferable to metal bond metal layers to each other by a clad method or welding. In this case, the place where the metal is bonded need not be the entire surface to be contacted, and may be partially formed at the upper end or the lower end in FIG. 5A.

[0073] As shown in Fig. 4 and Figs. 5A to 5C, when the conductive member 26.32 made of a metal sheet is used, the conductive members 26, 32 and the positive and negative electrode metal foils 22, 25 The connection method is not particularly limited. As a connection method, for example, both may be simply brought into contact, or resistance welding, laser welding, ultrasonic welding, force squeeze, fitting, pinching, or a method using a conductive adhesive may be used. Can be mentioned.

The thickness of the metal sheet used for the conductive members 26 and 32 is not particularly limited. However, like the conductive member 32 shown in FIG. 5A, the coating thickness of the positive electrode active material on one side of the positive electrode metal foil 22 and the coating thickness of the negative electrode active material on one side of the negative electrode metal foil 25 The thickness of the electrolyte (the thickness of the separator in the case of an electrolytic solution) between the overlapping positive electrode Z and negative electrode is preferably set equal to the sum. Accordingly, when the conductive member 32 is compressed from above and below after the conductive member 32 is disposed between adjacent cells, the interval between the positive electrode and the negative electrode can be maintained at an appropriate interval and can be firmly sandwiched. As a result, it is possible to prevent the positive electrode and the negative electrode from coming off from the conductive member 32, and to reduce the contact resistance.

[0075] In a third example, a metal foil is used instead of a block-like or bar-like member as the conductive member, and the space around the connecting portion between the positive electrode and the negative electrode is filled with a sealing material. As the metal foil in this case, a metal foil for positive electrode and a metal foil for negative electrode can be used.

A specific example is shown in FIG. In the configuration shown in FIG. 6, as the positive electrode metal foil 22 and the negative electrode metal foil 25, those in which the non-coated portions are further extended than those shown in the respective embodiments described above are used. The extended non-coated part is bent in the middle of the stacking direction of the positive electrode 21 and the negative electrode 24, and the height thereof is the distance between the positive electrode metal foil 22 and the negative electrode metal foil 25 in the stacking direction. Furthermore, it is folded back in the extending direction of the non-coated part at the same height.

[0077] A portion where the non-applied portion of the positive electrode metal foil 22 and the non-applied portion of the negative electrode metal foil 25 formed by this folding are welded is welded. Also, by bending the non-applied part The formed space is filled with a sealing material 38 that also functions as a spacer. The sealing material 38 includes a first portion 38a having a unit lamination period thickness, and a second portion having a thickness equal to the interval between the positive electrode metal foil 22 and the negative electrode metal foil 25 facing each other with the electrolyte therebetween. A block-shaped or bar-shaped member having an L-shaped cross section. The sealing material 38 is disposed so that the second portion 38b is located in a space formed by bending the non-application portion. As a result, the distance between the welded portions of the positive electrode 21 and the negative electrode 24 is maintained, and electrical contact between the electrolytic solution and the battery operating member between adjacent cells is prevented.

[0078] The bent shape of the non-application portion can be formed in advance. However, from the viewpoint of simplicity in manufacturing, before folding the non-application part, the sealing material 38 is placed in a predetermined position of the non-application part with the second portion 38b facing the extending direction of the non-application part. In this state, it is preferable to form the non-coated portion by bending it so as to lie over the second portion 38b. Further, as the sealing material 38, in addition to using a block-shaped or bar-shaped one formed in advance, a sealing material in a fluid state after welding of the non-applied parts is provided with a space around the non-applied parts. It can also be formed by pouring and curing.

[0079] FIG. 6 shows the case where the electrolyte is an electrolytic solution. However, when the electrolyte is a solid electrolyte or a polymer electrolyte, the sealing material 38 does not need a blocking function of the electrolytic solution. It can be made into the shape which has the part 38b.

The fourth example is a configuration combining the configuration shown in FIG. 4 and the configuration shown in FIG. In other words, the concave and convex portion of the conductive member bent in a wave shape is embedded with a sealing material having an L-shaped cross section.

[0081] With respect to the control terminal, as long as it is connected to the connection portion between the positive electrode 21 and the negative electrode 24 and is pulled out by the external film 5 force, the connection position and the pull-out position are arbitrary. An example is shown in Fig. 7. In the example shown in FIG. 7, the control terminal 39 is composed of a strip-shaped metal plate, and is welded to a portion where the positive electrode metal foil 22 and the negative electrode metal foil 25 are overlapped and connected to each other, and the exterior film 4, It is pulled out of the film-clad battery via 5 heat-sealing parts.

With respect to the exterior material, in the above-described embodiment, two exterior films 4, 5 are used as the exterior material. However, it is possible to have a configuration in which the electrode stack is sealed by folding the outer film into two, sandwiching the electrode stack, and heat-sealing the three open sides. Good. Furthermore, as the exterior material, a rigid container such as a metal container made of only a film or a plastic container may be used.

In the above description, the electrode stack is described as a plurality of cells 2 connected in series, but another view can be taken. That is, a plurality of positive electrode groups, in which a plurality of positive electrodes 21 are arranged in a line in an in-plane direction facing the non-coated portion 22a with the non-coated portion 22a facing the same side, and a plurality of negative electrodes 24 are arranged. With the non-applied part 25a facing the same side, multiple negative electrode groups arranged in a line in the in-plane direction facing the non-applied part 25a should be considered alternately stacked via an electrolyte. Chisaru

[0084] The positive electrode group and the negative electrode group are arranged so that the positive electrode active material 23 and the negative electrode active material 26 face each other, and the non-coated portion 22a of the positive electrode 21 and the non-coated portion 25a of the negative electrode 24 are opposite to each other. They are stacked alternately so that they face each other. The electrolyte (the separator 27 impregnated with the electrolytic solution or the solid electrolyte 37) is disposed in a region between the positive electrode group and the negative electrode group where each positive electrode active material 23 and each negative electrode active material 26 face each other. That is, each positive electrode active material 23 and each negative electrode active material 26 are opposed to each other via the electrolyte. The non-applied portions 22a and 25a of the positive electrode 21 and the negative electrode 24 have a length that can overlap with the non-applied portions 22a and 25a of the counter electrode opposite to each other through the electrolyte. And a part of the non-application part 25a of the negative electrode 24 are alternately connected in the stacking direction and are electrically connected. When the conductive member 6 is provided, the non-application portions 22a and 25a are connected via the conductive member 6. When the electrolyte is an electrolytic solution, the sealing material 7 is provided so as to cover the connection part between the non-application parts 22a and 25a. Thus, even if the electrode laminate is considered to be a laminate of a positive electrode group having a plurality of positive electrodes 21 and a negative electrode group having a plurality of negative electrodes 24 via an electrolyte, the effects thereof are the same as those described above. The form is the same.

In the above-described embodiment, the chemical battery is described as an example of the electric device. However, the present invention is an electrode that accumulates electric energy inside, such as a capacitor such as an electric double layer capacitor or an electrolytic capacitor. The present invention can be applied to various electric devices in which the laminate is sealed with an exterior material.

Claims

The scope of the claims

[1] An electrode laminate for accumulating electrician energy,

Each has a plurality of cells in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked via an electrolyte,

The positive electrode and the negative electrode have a sheet-like metal member coated with an electrode material so that one end thereof is a non-coated portion, and the non-coated portion of the positive electrode and the non-coated portion of the negative electrode are opposite to each other. It is laminated to protrude toward

The plurality of cells are arranged such that the non-coated portion of the positive electrode and the non-coated portion of the negative electrode face each other,

Between the cells adjacent to each other among the plurality of cells, a part of the non-coated part of the positive electrode of one cell and a part of the non-coated part of the negative electrode of the other cell are stacked. An electrode stack that is alternately connected in the direction and electrically connected.

[2] The electrolyte is an electrolytic solution, and is disposed between the stacked positive electrode and negative electrode, the separator impregnated with the electrolytic solution, and the electrolysis of one cell between the cells adjacent to each other. 2. The electrode laminate according to claim 1, further comprising a sealing material that prevents the liquid from contacting a battery acting member belonging to the other cell.

[3] The electrode laminate according to claim 2, wherein the sealing material is made of a metal adhesive resin.

[4] The electrode stack according to claim 1, wherein the electrolyte is a solid electrolyte or a polymer electrolyte.

[5] Between the cells adjacent to each other, a conductive member is provided between overlapping portions of the non-coated portion of the positive electrode and the non-coated portion of the negative electrode, and the positive electrode and the negative electrode are formed by the conductive member. 2. The electrode laminate according to claim 1, wherein are electrically connected.

[6] The electric conductor according to claim 5, wherein the conductive member is a member having a thickness equivalent to a distance between the sheet-like metal members of the positive electrode and the negative electrode facing each other with the electrolyte interposed therebetween. Polar laminate.

[7] The conductive member is a metal sheet that is bent in a wave shape and extends in the stacking direction of the positive electrode and the negative electrode. The non-coated portion of the positive electrode and the non-coated portion of the negative electrode are formed of the metal sheet. It enters into the recess formed by being bent into a wave shape and contacts the conductive member. The electrode laminate according to claim 5, which is continued.

[8] The metal sheet is a composite metal sheet in which first and second metal layers having different metal forces are laminated,

A part of the non-coated portion of the positive electrode of the one cell is electrically connected to the first metal layer,

A part of the non-coated portion of the negative electrode of the other cell is electrically connected to the second metal layer,

The electrolyte is an electrolyte solution; and

A sealing material disposed between the cells adjacent to each other so as to surround the outer periphery of the composite metal sheet so that the electrolyte solution of one cell does not come into contact with the battery action member belonging to the other cell! The electrode laminate according to claim 7, further comprising:

[9] An electrode laminate for accumulating electric energy,

A plurality of positive electrodes each having a sheet-like metal member coated with a positive electrode material so that one end portion thereof becomes a non-coated portion, and the non-coated portion of the positive electrode material facing the same side, A plurality of positive electrode groups arranged in a row in the in-plane direction,

A plurality of negative electrodes each having a sheet-like metal member coated with a negative electrode material so that one end thereof is a non-coated portion, and the non-coated portion of the negative electrode material facing the same side. A plurality of negative electrode groups arranged in a line in the in-plane direction facing,

Have

The positive electrode group and the negative electrode group are alternately stacked such that the positive electrode material and the negative electrode material face each other through an electrolyte, and the non-coated portion faces the opposite side between the positive electrode and the negative electrode. And

The non-coated portion of the positive electrode and the negative electrode has a length that can overlap with the non-coated portion of the counter electrode opposite to the electrode, and a part of the non-coated portion of the positive electrode and the non-coated portion of the negative electrode An electrode laminate in which a part of the electrode laminate is electrically connected in an overlapping manner in the stacking direction.

10. The electrode laminate according to claim 9, wherein the electrolyte is an electrolytic solution, and a sealing material is provided so as to cover a connection portion between the non-coated portion of the positive electrode and the non-coated portion of the negative electrode. .

[11] The non-coated portion of the positive electrode and the non-coated portion of the negative electrode adjacent to each other in the stacking direction are a conductive member The electrode laminate according to claim 9, wherein the electrode laminate is connected via a!

[12] The electrode laminate according to claim 1 or 9,

A positive electrode and a negative electrode tab electrically connected to the non-applied part of the positive electrode and the non-applied part of the negative electrode, respectively, at both ends of the electrode stack in the arrangement direction of the plurality of cells;

An exterior material that extends the tab and seals the electrode stack;

Having an electrical device.

13. The electric device according to claim 12, further comprising a terminal that is electrically connected to a connection portion between the cells adjacent to each other and that protrudes to the outside of the exterior material.

14. The electric device according to claim 12, wherein the exterior material is a film.