WO2013168490A1 - Cell stack - Google Patents

Cell stack Download PDF

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Publication number
WO2013168490A1
WO2013168490A1 PCT/JP2013/059953 JP2013059953W WO2013168490A1 WO 2013168490 A1 WO2013168490 A1 WO 2013168490A1 JP 2013059953 W JP2013059953 W JP 2013059953W WO 2013168490 A1 WO2013168490 A1 WO 2013168490A1
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WO
WIPO (PCT)
Prior art keywords
electrode tab
battery
caulking
positive electrode
battery cell
Prior art date
Application number
PCT/JP2013/059953
Other languages
French (fr)
Japanese (ja)
Inventor
森崎梨恵
小寺裕司
宮川幸樹典
Original Assignee
日立マクセル株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立マクセル株式会社 filed Critical 日立マクセル株式会社
Priority to CN201380012544.3A priority Critical patent/CN104170123A/en
Publication of WO2013168490A1 publication Critical patent/WO2013168490A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a battery laminate in which a plurality of thin plate batteries are stacked.
  • Non-aqueous electrolyte batteries typified by lithium-ion secondary batteries are characterized by high energy density, such as various mobile devices such as cars and motorcycles, personal digital assistants, uninterruptible power supplies (UPS (Uninterruptible Power Supply)), etc. It is used as a power source.
  • UPS Uninterruptible Power Supply
  • a thin plate-like laminated lithium ion secondary battery in which a power generation element is packaged with a flexible laminate sheet is often used.
  • a battery laminate in which a plurality of thin plate-like secondary batteries (battery cells) are stacked via an insulating sheet and these are electrically connected in series is also practically used (for example, Patent Document 1).
  • a plurality of battery cells are stacked so that the front and back are alternately reversed so that the positive electrode tab and the negative electrode tab derived from the battery cell face each other between adjacent battery cells. And the positive electrode tab and negative electrode tab which the adjacent battery cell opposes are electrically connected.
  • the electrode tabs are connected by ultrasonic welding or resistance welding.
  • the work of superimposing a plurality of battery cells and electrically connecting the positive electrode tab and the negative electrode tab of adjacent battery cells is a three-dimensional operation and is difficult to automate. It must be done manually in order. It is generally difficult to perform the ultrasonic welding method or the resistance welding method in a three-dimensional manner, and there is a problem that skill is required and work efficiency is poor.
  • An object of the present invention is to solve the above-described conventional problems, and to provide a battery laminate that is easy in electrical connection of electrode tabs between adjacent battery cells and is excellent in production efficiency.
  • the battery laminate of the present invention is a battery laminate in which a plurality of thin battery cells are stacked.
  • Each of the plurality of battery cells has a positive electrode tab and a negative electrode tab derived from the outer periphery.
  • the positive electrode tab and the negative electrode tab of adjacent battery cells face each other.
  • the positive electrode tab and the negative electrode tab facing each other are electrically connected by caulking a caulking member so that the plurality of battery cells are connected in series.
  • the positive electrode tab and the negative electrode tab are electrically connected using the caulking member.
  • the electrical connection work by the caulking member is easy. Therefore, it is possible to provide a battery stack having excellent production efficiency.
  • FIG. 1A is a perspective view seen from the front side of a battery cell constituting a battery stack according to an embodiment of the present invention
  • FIG. 1B is a perspective view seen from the back side
  • FIG. 2A is a front view of a plate material constituting a battery stack according to an embodiment of the present invention
  • FIG. 2B is a perspective view of the plate material
  • FIG. 3A is a perspective view seen from the front side of a battery cell in which a pair of sides of the laminate sheet is bent in one embodiment of the present invention
  • FIG. 3B is a perspective view seen from the back side.
  • FIG. 4A is a perspective view illustrating a process of fixing the first battery cell to one surface of the first plate member in the manufacture of the battery stack according to the embodiment of the present invention
  • FIG. 4B is a front view thereof
  • FIG. 4C is a side view thereof.
  • FIG. 5 is a perspective view illustrating a process of fixing the second battery cell to the other surface of the first plate member in the manufacture of the battery stack according to the embodiment of the present invention.
  • FIG. 6 is a perspective view showing the first battery cell and the second battery cell fixed to both surfaces of the first plate member in the manufacture of the battery laminate according to the embodiment of the present invention.
  • FIG. 7 is a perspective view of a caulking member used to electrically connect a positive electrode tab and a negative electrode tab that face each other in the manufacture of the battery stack according to the embodiment of the present invention.
  • FIG. 8A shows a process of electrically connecting opposing electrode tabs of the first battery cell and the second battery cell using the first caulking member in the manufacture of the battery stack according to the embodiment of the present invention.
  • a perspective view and FIG. 8B are the front views.
  • 9A is a perspective view illustrating a process of covering the first caulking member with the first cushion member in the manufacture of the battery stack according to the embodiment of the present invention
  • FIG. 9B is a side view thereof
  • FIG. 9C is a front view thereof. It is.
  • FIG. 10A is a perspective view showing a process of bending an electrode tab to which a first cushion member is attached in the manufacture of a battery laminate according to an embodiment of the present invention
  • FIG. 10B is a side view thereof
  • FIG. 10C is a front view thereof.
  • FIG. 11 is a perspective view illustrating a process of fixing the third battery cell to the first battery cell via the second plate member in the manufacture of the battery stack according to the embodiment of the present invention.
  • FIG. 12 is a perspective view showing first to third battery cells stacked via plate members in the manufacture of a battery stack according to an embodiment of the present invention.
  • FIG. 13A shows a process of electrically connecting opposing electrode tabs of the first battery cell and the third battery cell using the second caulking member in the manufacture of the battery stack according to the embodiment of the present invention.
  • a perspective view and FIG. 13B are the front views.
  • 14A is a perspective view illustrating a process of covering the second caulking member with the second cushion member in the manufacture of the battery stack according to the embodiment of the present invention
  • FIG. 14B is a front view thereof
  • FIG. 14C is a side view thereof.
  • FIG. 15A is a front view showing a process of bending an electrode tab to which a second cushion member is attached
  • FIG. 15B is a side view thereof, in manufacturing the battery stack according to the embodiment of the present invention.
  • FIG. 15A is a front view showing a process of bending an electrode tab to which a second cushion member is attached
  • FIG. 15B is a side view thereof, in manufacturing the battery stack according to the embodiment of the present invention.
  • FIG. 16 is a perspective view of a battery stack according to an embodiment of the present invention.
  • FIG. 17A is a front view of a battery stack according to an embodiment of the present invention, and
  • FIG. 17B is a side view thereof.
  • FIG. 18 is a perspective view of another battery cell constituting the battery stack of the present invention as viewed from the front side.
  • FIG. 19 is a front view of another plate member constituting the battery laminate of the present invention.
  • FIG. 20 is a front view of still another plate material constituting the battery laminate of the present invention.
  • FIG. 21 is a front view of still another plate material constituting the battery stack of the present invention.
  • the battery laminate of the present invention is a battery laminate in which a plurality of thin battery cells are stacked.
  • Each of the plurality of battery cells has a positive electrode tab and a negative electrode tab derived from the outer periphery.
  • the positive electrode tab and the negative electrode tab of adjacent battery cells face each other.
  • the positive electrode tab and the negative electrode tab facing each other are electrically connected by caulking a caulking member so that the plurality of battery cells are connected in series.
  • the positive electrode tab and the negative electrode tab that are electrically connected to each other are bent so that the caulking member approaches the power generation element of the battery cell.
  • a compressible and deformable cushion member covers the caulking member. Thereby, an electrode tab can be protected.
  • the cushion member is fixed to the positive electrode tab or the negative electrode tab.
  • a positive electrode tab or a negative electrode tab can be reinforced with a cushion member.
  • the cushion member is bent together with the positive electrode tab and the negative electrode tab. Thereby, it can prevent that the curvature of the bending part of an electrode tab becomes small. Moreover, since the cushion member covers the bent part of the electrode tab, the possibility that an external force acts on the bent part can be reduced.
  • the cushion member may be fixed to the exterior of the battery cell. Thereby, the reinforcement effect of the cushion member with respect to an electrode tab further improves.
  • a plate material on which the battery cells are fixed directly or indirectly is disposed between the adjacent battery cells.
  • the cushion member may be fixed to the plate material.
  • the caulking member is preferably made of a conductive metal.
  • the wiring and the electrode tab can be electrically connected by connecting the wiring to the caulking member.
  • wiring is caulked to the caulking member and electrically connected. This facilitates the work of connecting the wiring to the electrode tab, which is advantageous in improving the production efficiency of the battery stack.
  • FIG. 1A is a perspective view seen from the front side of the battery cell 10 constituting the battery stack according to one embodiment of the present invention
  • FIG. 1B is a perspective view seen from the back side.
  • the battery cell 10 has a substantially rectangular shape in plan view, and has a thin plate shape that is thinner than the vertical and horizontal dimensions of the substantially rectangular shape.
  • a thin plate-shaped power generation element (not shown) having a substantially rectangular plan view shape is enclosed in an exterior made of a laminate sheet 13 together with an electrolytic solution.
  • the power generation element includes a positive electrode in which a positive electrode mixture layer including a positive electrode active material is applied and formed on both surfaces of a predetermined region of the positive electrode current collector, and a negative electrode mixture layer including a negative electrode active material on both surfaces of the predetermined region of the negative electrode current collector Is an electrode laminate in which negative electrodes formed by coating are alternately laminated via separators.
  • the type of the battery is not particularly limited, but a secondary battery, particularly a lithium ion secondary battery is preferable.
  • the laminate sheet 13 is thinner than the power generation element and has flexibility.
  • the laminate sheet 13 may be a flexible multilayer sheet in which a heat-fusible resin layer (for example, a modified polyolefin layer) is laminated on the surface of the base layer made of aluminum or the like on the side facing the power generation element. Good.
  • a heat-fusible resin layer for example, a modified polyolefin layer
  • One rectangular laminate sheet 13 is folded in two at the lower side (one short side) 14z so as to sandwich the power generation element, and is superposed along the three sides 14x, 14s, 14s other than the lower side 14z to be heat-sealed. It is sealed by etc.
  • a positive electrode tab 11p and a negative electrode tab 11n are led out from an upper side (the other short side) 14x facing the lower side 14z.
  • the positive electrode tab 11p and the negative electrode tab 11n have a strip shape and extend along a direction perpendicular to the upper side 14x (that is, a direction parallel to a pair of side sides (long sides) 14s adjacent to the upper side 14x). Yes.
  • the positive electrode tab 11p is made of, for example, an aluminum thin plate, and is electrically connected to a plurality of positive electrode current collectors (not shown) constituting the power generation element.
  • the negative electrode tab 11n is made of, for example, a copper thin plate, a nickel-plated copper thin plate, or a copper / nickel clad material, and is electrically connected to a plurality of negative electrode current collectors (not shown) constituting the power generation element. It is connected to the.
  • the positive electrode tab 11p and the negative electrode tab 11n may be collectively referred to as “electrode tabs”.
  • a rectangular region 16 corresponding to the power generation element is a sealing region of the laminate sheet 13 along the three sides 14 x, 14 s, 14 s of the battery cell 10. Protrusively.
  • the back surface of the battery cell 10 is substantially flat.
  • the surface on the side where the rectangular projecting region 16 is formed by the power generation element shown in FIG. 1A is called the “front” of the battery cell 10 and is shown in FIG. 1B.
  • the surface on the side that is substantially flat is called the “back surface” of the battery cell 10.
  • a direction connecting the front surface and the back surface is referred to as a “thickness direction”.
  • FIG. 2A is a front view of the plate member 20 constituting the battery stack according to the embodiment of the present invention
  • FIG. 2B is a perspective view of the plate member 20.
  • the plate material 20 has a substantially rectangular shape as a whole.
  • the upper short side of the plate member 20 is formed in a step shape by forming a notch 21 that cuts off one end thereof.
  • a convex portion 22 protruding upward is formed at the other end of the upper short side of the plate member 20.
  • the plate member 20 is made of a hard material that can be regarded as a substantially rigid body.
  • it is preferably made of an insulating resin material such as polycarbonate or a metal material having excellent thermal conductivity such as copper or aluminum.
  • the thickness of the plate member 20 varies depending on the material of the plate member 20 and the like, but is preferably 0.3 mm or more, more preferably 0.5 mm or more, and particularly preferably 0.8 mm or more.
  • the upper limit of the thickness of the plate member 20 can be appropriately set in consideration of the overall thickness of the battery stack, etc., but is preferably 1.5 mm or less, and more preferably 1.2 mm or less.
  • the size of the plate member 20 viewed from the front is preferably equal to or slightly larger than the size of the battery cell 10 viewed from the front (not including the positive electrode tab 11p and the negative electrode tab 11n).
  • the plurality of battery cells 10 and the plurality of plate members 20 described above are stacked such that the battery cells 10 and the plate members 20 are alternately arranged and fixed to each other. And integrated.
  • the plurality of battery cells 10 are stacked by alternately inverting the front and back so that the positive electrode tab 11p and the negative electrode tab 11n face each other between the adjacent battery cells 10.
  • plate material 20 is laminated
  • the plurality of battery cells 10 constituting the battery stack have the same shape, and the plurality of plate members 20 constituting the battery stack have the same shape.
  • the names of the members are “first”, “second”, “third”,... And suffixes of alphabets such as “a”, “b”, “c”,...
  • the seal portion of the laminate sheet 13 along the pair of side sides 14 s and 14 s is bent at a substantially right angle toward the protruding region 16.
  • the width W10 of the battery cell 10 shown in FIG. 1A is slightly larger than the width W20 of the plate member 20 shown in FIG.
  • the width W10 ′ of the battery cell 10 becomes smaller than the width W20 of the plate member 20 by bending the pair of side sides 14s and 14s.
  • the width W10 (see FIG. 1A) of the battery cell 10 in which the pair of side sides 14s, 14s is not bent is the same as or smaller than the width W20 (see FIG. 2A) of the plate member 20, FIG. As shown in FIG. 3B, it is not necessary to bend the pair of side sides 14s, 14s of the battery cell 10.
  • the first battery cell 10a and the first plate member 20a are joined.
  • the front surface of the first battery cell 10a that is, the top surface of the protruding region 16 (see FIG. 3A) is fixed to the first plate member 20a.
  • the positive electrode tab 11p of the first battery cell 10a faces the convex portion 22 of the first plate member 20a.
  • the positive electrode tab 11p and the negative electrode tab 11n protruding from the upper side 14x of the first battery cell 10a extend above the convex portion 22 of the first plate member 20a.
  • the first plate member 20a slightly protrudes from the lower side 14z and the pair of side sides 14s, 14s of the first battery cell 10a.
  • plate material 20 For example, a double-sided adhesive tape and an adhesive agent can be used.
  • the method of fixing with a double-sided pressure-sensitive adhesive tape is preferable because the stacking process of the battery stack 1 can be performed easily and quickly.
  • the 2nd battery cell 10b is fixed to the surface on the opposite side to the surface where the 1st battery cell 10a of the 1st board
  • the second battery cell 10b is fixed to the first plate member 20a so that the positive electrode tab 11p and the negative electrode tab 11n of the second battery cell 10b face the negative electrode tab 11n and the positive electrode tab 11p of the first battery cell 10a, respectively. Is done. That is, the top surface of the protruding region 16 of the second battery cell 10b is fixed to the first plate member 20a.
  • FIG. 6 shows a state where the first battery cell 10a is fixed to one surface of the first plate member 20a and the second battery cell 10b is fixed to the other surface.
  • the negative electrode tab 11n of the first battery cell 10a and the positive electrode tab 11p of the second battery cell 10b face each other, and the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the second battery cell 10b are in contact with the first plate member 20a. Are opposed to each other with the convex portion 22 therebetween.
  • FIG. 7 is a perspective view of the caulking member 30 used in the present embodiment.
  • a substantially rectangular metal plate is bent at a substantially right angle at the center thereof.
  • a plurality of crown-shaped (or snap-shaped) shapes are formed on the surfaces of the first piece 31 on one side and the second piece 32 on the other side facing each other (the valley folding side of the caulking member 30) with respect to the bending position. ) Is protruding.
  • a substantially cylindrical wiring terminal 35 for connecting wiring is formed so as to protrude.
  • the positive electrode tab 11p and the negative electrode tab 11n are overlapped and inserted on the valley fold side of the caulking member 30, and the caulking member 30 is plastically deformed so that the first piece 31 and the second piece 32 overlap the positive electrode tab 11p and the negative electrode tab 11n. Then, it is folded in half and crimped to the positive electrode tab 11p and the negative electrode tab 11n.
  • the protrusion 33 penetrates the positive electrode tab 11p and the negative electrode tab 11n, breaks the oxide film on these surfaces, and the positive electrode tab 11p, the negative electrode tab 11n, and these and the caulking member 30 are electrically connected.
  • the material of the caulking member 30 is not particularly limited, but is preferably a conductive metal material. For example, a material obtained by applying nickel plating or tin plating to copper or brass can be used.
  • FIGS. 8A and 8B show a state where the negative electrode tab 11n of the first battery cell 10a and the positive electrode tab 11p of the second battery cell 10b are electrically connected by the first caulking member 30a.
  • a voltage monitoring wiring may be connected to the wiring terminal 35 of the first caulking member 30a.
  • the method for connecting the wiring terminal 35 and the wiring is not particularly limited, and a method using caulking, a method using solder, or the like can be adopted. However, the method using caulking is preferable because the connecting operation is easy. That is, with the terminal of the voltage monitoring wiring inserted into the wiring terminal 35 having a hollow cylindrical shape, the wiring terminal 35 is compressed in the diameter direction to be plastically deformed.
  • the wiring can be connected to the wiring terminal 35 by caulking the wiring terminal 35 together with the voltage monitoring wiring.
  • the voltage monitoring wiring for example, it is possible to monitor the voltage of each of the plurality of battery cells constituting the battery stack.
  • the first caulking member 30 a may not include the wiring terminal 35.
  • the first caulking member 30a is covered with the first cushion member 40a.
  • the first cushion member 40a is flexible and has a characteristic that it easily compresses and deforms when a pressing force is applied and immediately returns to the initial state when the pressing force is released.
  • a flexible porous material what is called sponge can be used.
  • urethane foam, polyethylene foam, rubber sponge and the like can be used.
  • the first cushion member 40a is insulative because the first caulking member 30a comes into contact with surrounding members (for example, other caulking members adjacent to each other in the stacking direction, the inner wall of the container that stores the battery stack, etc.). It is advantageous to prevent short circuit.
  • the first cushion member 40a before being attached to the first caulking member 30a has, for example, a rectangular shape (or a strip shape).
  • the first cushion member 40a is brought into contact with the upper end of the first caulking member 30a, bent so as to overlap both surfaces of the first caulking member 30a, and fixed to the first caulking member 30a.
  • the electrode terminal 35 of the first caulking member 30a is also preferably covered with the first cushion member 40a.
  • the first cushion member 40a preferably extends to and is fixed to the electrode tabs 11p and 11n.
  • the first cushion member 40a may further extend to the laminate sheet 13 or the plate material 20 of the battery cell 10 and be fixed thereto.
  • the method for fixing the first cushion member 40a is not particularly limited, and for example, a double-sided pressure-sensitive adhesive tape or an adhesive can be applied to the surface of the first cushion member 40a that is in contact with the first caulking member 30a.
  • a double-sided pressure-sensitive adhesive tape or an adhesive can be applied to the surface of the first cushion member 40a that is in contact with the first caulking member 30a.
  • the method of fixing with a double-sided pressure-sensitive adhesive tape is preferable because the battery stack can be easily and quickly laminated.
  • the electrode tabs 11p and 11n to which the first cushion member 40a is attached are bent.
  • the first cushion member 40a is also fixed to the bent portions of the electrode tabs 11p and 11n, the first cushion member 40a is also bent together with the electrode tabs 11p and 11n.
  • the upper end of the first cushion member 40a attached to the bent electrode tabs 11p and 11n is substantially the same height as or lower than the upper end of the convex portion 22 of the first plate member 20a.
  • the third battery cell 10c is joined to the first battery cell 10a via the second plate member 20b.
  • plate material 20b is fixed to the 1st battery cell 10a so that the convex part 22 of the 2nd board
  • the third battery cell 10c is fixed to the second plate member 20b so that the surface of the third battery cell 10c opposite to the protruding region 16 faces the second plate member 20b.
  • FIG. 12 shows a state in which the second battery cell 10b, the first plate member 20a, the first battery cell 10a, the second plate member 20b, and the third battery cell 10c are joined in this order.
  • the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the third battery cell 10c are opposed to each other, and the first cushion member 40a and the positive electrode tab 11p of the third battery cell 10c are the convex portion 22 of the second plate member 20b. It is opposed across the.
  • the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the third battery cell 10c facing each other are electrically connected to each other by caulking a second caulking member 30b (see FIG. 7).
  • . 13A and 13B show a state where the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the third battery cell 10c are electrically connected by the second caulking member 30b.
  • the connection method using the second caulking member 30b is the same as that using the first caulking member 30a shown in FIGS. 8A and 8B. Although illustration is omitted, the voltage monitoring wiring may be connected to the wiring terminal 35 of the second caulking member 30b as in FIGS. 8A and 8B.
  • the second caulking member 30b is covered with the second cushion member 40b in the same manner as described in FIGS. 9A, 9B, and 9C.
  • the electrode tabs 11p and 11n to which the second cushion member 40b is attached are bent in the same manner as described in FIGS. 10A, 10B, and 10C.
  • the battery cells 10 are stacked via the plate material 20, and (2) the electrodes facing each other through the notches 21 (see FIG. 2A) of the plate material 20 between adjacent battery cells.
  • the tabs 11p and 11n are electrically connected using the caulking member 30, (3) the caulking member 30 is covered with the cushion member 40, and (4) the electrode tabs 11p and 11n caulked by the caulking member 30 are bent. Repeat the process as many times as necessary.
  • FIG. 16 is a perspective view of the battery stack 1 according to the present embodiment thus obtained
  • FIG. 17A is a front view of the battery stack 1
  • FIG. 17B is a side view of the battery stack 1.
  • seven battery cells 10a to 10g are stacked and integrated through six plate members 20a to 20f.
  • the seven battery cells 10a to 10g are connected in series by caulking the caulking member 30 to the positive electrode tab 11p and the negative electrode tab 11n facing each other of the adjacent battery cells 10 via the plate member 20.
  • Each caulking member 30 is covered with a cushion member 40.
  • the positive electrode tab 11p and the negative electrode tab 11n that are caulked by the caulking member 30 are bent so that the caulking member 30 approaches the protruding region 16.
  • the cushion member 40 is accommodated in a gap between the heat seal portions of the laminate sheet 13 along the upper side 14x, which is formed by the protruding regions 16 of the two adjacent battery cells 10.
  • Wiring for charging / discharging the battery stack 1 is connected to the positive electrode tab 11p and the negative electrode tab 11n at both ends of the seven battery cells 10a to 10g connected in series.
  • the wiring connection method is not particularly limited. Although illustration is omitted, for example, similarly to the above, the caulking member 30 can be attached to each of the positive electrode tab 11p and the negative electrode tab 11n, and the wiring can be caulked to the wiring terminal 35 of the caulking member 30.
  • the caulking member 30 may be covered with the cushion member 40, and the positive electrode tab 11p and the negative electrode tab 11n caulked by the caulking member 30 may be bent.
  • the battery stack 1 provided with the wiring is used by being stored in a container having a storage space surrounded by an inner wall having a substantially rectangular parallelepiped shape, for example.
  • the electrode tabs of opposite polarities facing each other in adjacent battery cells are electrically connected by caulking the caulking member 30.
  • the operation of caulking the caulking member 30 can be easily performed using, for example, a predetermined tool. Accordingly, the working efficiency is better than the conventional ultrasonic welding method and resistance welding method, which is advantageous for improving the production efficiency.
  • the caulking member 30 includes the wiring terminal 35, in order to connect the wiring to the electrode tab, it is only necessary to crimp the wiring terminal 35 together with the wiring. As described above, since the wiring can be connected by the caulking method, the wiring for charging / discharging the battery stack 1 and the wiring for monitoring the voltage of each battery cell are connected to the electrode tab. Is also very simple.
  • the electrode tab can be protected by covering the caulking member 30 with the cushion member 40. That is, the external force does not directly act on the caulking member 30, and the cushion member 40 relieves the external force. Therefore, the external force acting on the electrode tab is also alleviated and the electrode tab is protected.
  • the cushion member 40 prevents the caulking member 30 from coming into direct contact with the inner wall of the container. As a result, even if the battery stack 1 collides against the inner wall of the container due to vibration or impact applied to the container containing the battery stack 1, the external force acting on the electrode tab to which the caulking member 30 is attached is cushioned. The member 40 relaxes.
  • the cushion member 40 When the cushion member 40 has insulation, the insulation of the caulking member 30 with respect to the surrounding members is improved. That is, the cushion member 40 prevents the caulking members 30 adjacent in the stacking direction of the battery cells 10 from being in electrical contact with each other. Further, when the battery stack 1 is stored in a container, the cushion member 40 prevents the caulking member 30 from being in electrical contact with the inner wall of the container.
  • the caulking member 30 and the cushion member 40 covering the caulking member 30 do not protrude above the convex portion 22 of the plate member 20 when viewed along the stacking direction of the battery cells 10. (See FIG. 17A). Accordingly, since the battery stack 1 can be stored in a container having a smaller internal volume, the container can be reduced in size. In addition, the possibility of external force acting on the electrode tab even when vibration or impact is applied to the container in which the battery stack 1 is stored can reduce the damage on the electrode tab. Furthermore, the possibility that a short circuit accident will occur due to the caulking member 30 coming into contact with the inner wall of the container in which the battery stack 1 is stored is reduced.
  • the electrode tab can be reinforced by the cushion member 40.
  • the cushion member 40 relieves the compression and bending due to the impact from the outside, or the tension through the wiring connected to the caulking member 30, it is possible to prevent the electrode tab from being damaged.
  • the cushion member 40 may be further extended and fixed to the laminate sheet 13 or the plate material 20 of the battery cell 10. Thereby, said reinforcement effect with respect to the electrode tab of the cushion member 40 further improves. Therefore, for example, even if a tension is applied to the wiring connected to the caulking member 30, the cushion member 40 resists the tension, so that the electrode tab can be prevented from being damaged.
  • the cushion member 40 may have a layer made of a material having a high tensile strength. Thereby, since the cushion member 40 opposes the tension
  • the structure of the caulking member for electrically connecting the positive electrode tab 11p and the negative electrode tab 11n is not limited to the above embodiment.
  • the method for connecting the wiring to the electrode tab may be any method other than the method by caulking described in the above embodiment, for example, any method such as soldering or welding.
  • the electrode tab crimped by the caulking member 30 is bent, but the bending may be omitted. In this case, it is preferable to increase the upward protrusion amount of the convex portion 22 so that the caulking member 30 and the cushion member 40 covering the same do not protrude upward from the convex portion 22 of the plate member 20.
  • the method of covering the caulking member 30 with the cushion member 40 is not limited to the above embodiment.
  • the cushion member 40 may be attached so that most (preferably all) of the caulking member 30 is not exposed.
  • the method of folding the cushion member 40 in contact with the upper end of the caulking member 30 as in the above embodiment the method of bending the cushion member 40 in contact with the side of the caulking member 30 is formed in a bag shape in advance.
  • Arbitrary methods such as a method of covering the caulking member 30 with the cushion member 40, can be adopted.
  • the cushion member 40 that covers the caulking member 30 may be omitted.
  • the battery cell 10 of the present invention is not limited to the configuration shown in FIGS. 1A and 1B, and may be any thin battery cell.
  • the battery cell 10 is a three-side sealed battery cell in which one laminate sheet 13 is folded in two at the lower side 14z and the laminate sheet 13 is sealed along three sides except the lower side 14z.
  • a battery cell 10 of a four-sided seal type in which a power generation element is sandwiched between two rectangular laminate sheets 13 having the same size and sealed along four sides including the lower side 14 z may be used.
  • the positive electrode tab 11p and the negative electrode tab 11n are derived from the common short side 14x.
  • the positive electrode tab 11p and the negative electrode tab 11n are derived from one of the pair of side sides (long sides) 14s. May be.
  • the positive electrode tab 11p and the negative electrode tab 11n may be derived from different sides.
  • the planar view shape of the plate member 20 is not limited to the above embodiment.
  • the notch 21 may be formed in the center part except the both ends of the upper short side.
  • the two notches 21 may be formed in the part except the both ends and center part of an upper short side.
  • the two notches 21 may be formed in the both ends except the center part of an upper short side.
  • the battery cell 10 may be directly fixed to the plate member 20, or may be attached to the plate member 20 via a compressible buffer member, an insulating sheet having insulation properties, a heat transfer plate having excellent heat transfer characteristics, or the like. It may be fixed indirectly.
  • Adjacent battery cells 10 may be joined without using the plate material 20.
  • the number of battery cells 10 and the number of plate members 20 constituting the battery stack 1 are not limited to the above embodiment, and can be arbitrarily set.
  • the method for manufacturing the battery stack 1 is not limited to the above embodiment.
  • New battery cells may be sequentially stacked on the same side, or may be alternately stacked on the opposite side. Each time a new battery cell is stacked, the caulking member and the cushion member may be attached, or after all the necessary battery cells are stacked, the caulking member and the cushion member may be attached.
  • the field of application of the present invention is not particularly limited, and is widely used as a battery laminate used for power sources of various mobile devices such as automobiles, motorcycles, and electrically assisted bicycles, personal digital assistants, and uninterruptible power supplies (UPS). be able to.
  • it can be preferably used as a battery laminate mounted on various mobile devices that are susceptible to shock and vibration.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

A plurality of thin-board-like cells (10) are stacked such that each of the positive electrode tabs (11p) and each of the negative electrode tabs (11n) of the adjacent cells (10) face each other. Each of the positive electrode tabs (11p) and each of the negative electrode tabs (11n) facing each other are electrically connected to each other by swaging a swaging member (30) such that the cells (10) are connected in series.

Description

電池積層体Battery stack
　本発明は複数の薄板状の電池が積み重ねられてなる電池積層体に関する。 The present invention relates to a battery laminate in which a plurality of thin plate batteries are stacked.
　リチウムイオン二次電池に代表される非水電解質電池は、エネルギー密度が高いという特徴から、自動車やバイク等の各種移動機器、携帯情報端末、無停電電源装置（ＵＰＳ（Uninterruptible Power Supply））等の電源として利用されている。このような用途において、エネルギー密度を更に向上させるため、可撓性を有するラミネートシートで発電要素を外装した薄板状のラミネート形リチウムイオン二次電池が多く使用されている。更に、所望する電池容量を得るために、複数の薄板状の二次電池（電池セル）を絶縁シートを介して積み重ねてこれらを直列に電気的に接続した電池積層体も実用されている（例えば特許文献１参照）。 Non-aqueous electrolyte batteries typified by lithium-ion secondary batteries are characterized by high energy density, such as various mobile devices such as cars and motorcycles, personal digital assistants, uninterruptible power supplies (UPS (Uninterruptible Power Supply)), etc. It is used as a power source. In such applications, in order to further improve the energy density, a thin plate-like laminated lithium ion secondary battery in which a power generation element is packaged with a flexible laminate sheet is often used. Furthermore, in order to obtain a desired battery capacity, a battery laminate in which a plurality of thin plate-like secondary batteries (battery cells) are stacked via an insulating sheet and these are electrically connected in series is also practically used (for example, Patent Document 1).
　この電池積層体では、電池セルから導出された正極タブと負極タブとが隣り合う電池セル間で互いに対向するように、複数の電池セルがその表裏が交互に反転するように重ねられる。そして、隣り合う電池セルの対向する正極タブと負極タブとが電気的に接続される。電極タブの接続は、超音波溶接法又は抵抗溶接法により行われるのが一般的である。 In this battery stack, a plurality of battery cells are stacked so that the front and back are alternately reversed so that the positive electrode tab and the negative electrode tab derived from the battery cell face each other between adjacent battery cells. And the positive electrode tab and negative electrode tab which the adjacent battery cell opposes are electrically connected. In general, the electrode tabs are connected by ultrasonic welding or resistance welding.
特許第４４９９９７７号明細書Patent No. 4499977
　複数の電池セルを重ね合わせて、隣り合う電池セルの正極タブと負極タブとを電気的に接続する作業は、立体的な作業であるので自動化が難しく、作業者は各接続箇所を１つずつ順に手作業で行う必要がある。超音波溶接法又は抵抗溶接法を立体的に順次行うことは、一般に難しく、熟練を要し、また作業効率が悪いという課題がある。 The work of superimposing a plurality of battery cells and electrically connecting the positive electrode tab and the negative electrode tab of adjacent battery cells is a three-dimensional operation and is difficult to automate. It must be done manually in order. It is generally difficult to perform the ultrasonic welding method or the resistance welding method in a three-dimensional manner, and there is a problem that skill is required and work efficiency is poor.
　本発明は、上記の従来の課題を解決し、隣り合う電池セル間の電極タブの電気的接続が容易であり、生産効率に優れた電池積層体を提供することを目的とする。 An object of the present invention is to solve the above-described conventional problems, and to provide a battery laminate that is easy in electrical connection of electrode tabs between adjacent battery cells and is excellent in production efficiency.
　本発明の電池積層体は、複数の薄板状の電池セルが積み重ねられた電池積層体である。前記複数の電池セルのそれぞれは、外周辺から導出された正極タブ及び負極タブを有する。隣り合う電池セルの前記正極タブと前記負極タブとが互いに対向する。前記複数の電池セルが直列に接続されるように、互いに対向する前記正極タブと前記負極タブとがかしめ部材をかしめることにより電気的に接続されている。 The battery laminate of the present invention is a battery laminate in which a plurality of thin battery cells are stacked. Each of the plurality of battery cells has a positive electrode tab and a negative electrode tab derived from the outer periphery. The positive electrode tab and the negative electrode tab of adjacent battery cells face each other. The positive electrode tab and the negative electrode tab facing each other are electrically connected by caulking a caulking member so that the plurality of battery cells are connected in series.
　本発明によれば、かしめ部材を用いて正極タブと負極タブとが電気的に接続される。かしめ部材による電気的接続作業は容易である。従って、生産効率に優れた電池積層体を提供することができる。 According to the present invention, the positive electrode tab and the negative electrode tab are electrically connected using the caulking member. The electrical connection work by the caulking member is easy. Therefore, it is possible to provide a battery stack having excellent production efficiency.
図１Ａは、本発明の一実施形態にかかる電池積層体を構成する電池セルの正面側から見た斜視図、図１Ｂは、その背面側から見た斜視図である。FIG. 1A is a perspective view seen from the front side of a battery cell constituting a battery stack according to an embodiment of the present invention, and FIG. 1B is a perspective view seen from the back side. 図２Ａは本発明の一実施形態にかかる電池積層体を構成する板材の正面図、図２Ｂは当該板材の斜視図である。FIG. 2A is a front view of a plate material constituting a battery stack according to an embodiment of the present invention, and FIG. 2B is a perspective view of the plate material. 図３Ａは、本発明の一実施形態において、ラミネートシートの一対の側辺を折り曲げた電池セルの正面側から見た斜視図、図３Ｂは、その背面側から見た斜視図である。FIG. 3A is a perspective view seen from the front side of a battery cell in which a pair of sides of the laminate sheet is bent in one embodiment of the present invention, and FIG. 3B is a perspective view seen from the back side. 図４Ａは、本発明の一実施形態にかかる電池積層体の製造において、第１板材の一方の面に第１電池セルを固定する工程を示した斜視図、図４Ｂはその正面図、図４Ｃはその側面図である。4A is a perspective view illustrating a process of fixing the first battery cell to one surface of the first plate member in the manufacture of the battery stack according to the embodiment of the present invention, FIG. 4B is a front view thereof, and FIG. 4C. Is a side view thereof. 図５は、本発明の一実施形態にかかる電池積層体の製造において、第１板材の他方の面に第２電池セルを固定する工程を示した斜視図である。FIG. 5 is a perspective view illustrating a process of fixing the second battery cell to the other surface of the first plate member in the manufacture of the battery stack according to the embodiment of the present invention. 図６は、本発明の一実施形態にかかる電池積層体の製造において、第１板材の両面に固定された第１電池セル及び第２電池セルを示した斜視図である。FIG. 6 is a perspective view showing the first battery cell and the second battery cell fixed to both surfaces of the first plate member in the manufacture of the battery laminate according to the embodiment of the present invention. 図７は、本発明の一実施形態にかかる電池積層体の製造において、対向する正極タブと負極タブとを電気的に接続するために使用されるかしめ部材の斜視図である。FIG. 7 is a perspective view of a caulking member used to electrically connect a positive electrode tab and a negative electrode tab that face each other in the manufacture of the battery stack according to the embodiment of the present invention. 図８Ａは、本発明の一実施形態にかかる電池積層体の製造において、第１電池セル及び第２電池セルの対向する電極タブを第１かしめ部材を用いて電気的に接続する工程を示した斜視図、図８Ｂはその正面図である。FIG. 8A shows a process of electrically connecting opposing electrode tabs of the first battery cell and the second battery cell using the first caulking member in the manufacture of the battery stack according to the embodiment of the present invention. A perspective view and FIG. 8B are the front views. 図９Ａは、本発明の一実施形態にかかる電池積層体の製造において、第１かしめ部材を第１クッション部材で覆う工程を示した斜視図、図９Ｂはその側面図、図９Ｃはその正面図である。9A is a perspective view illustrating a process of covering the first caulking member with the first cushion member in the manufacture of the battery stack according to the embodiment of the present invention, FIG. 9B is a side view thereof, and FIG. 9C is a front view thereof. It is. 図１０Ａは、本発明の一実施形態にかかる電池積層体の製造において、第１クッション部材を取り付けた電極タブを折り曲げる工程を示した斜視図、図１０Ｂはその側面図、図１０Ｃはその正面図である。10A is a perspective view showing a process of bending an electrode tab to which a first cushion member is attached in the manufacture of a battery laminate according to an embodiment of the present invention, FIG. 10B is a side view thereof, and FIG. 10C is a front view thereof. It is. 図１１は、本発明の一実施形態にかかる電池積層体の製造において、第１電池セルに第２板材を介して第３電池セルを固定する工程を示した斜視図である。FIG. 11 is a perspective view illustrating a process of fixing the third battery cell to the first battery cell via the second plate member in the manufacture of the battery stack according to the embodiment of the present invention. 図１２は、本発明の一実施形態にかかる電池積層体の製造において、板材を介して積層された第１～第３電池セルを示した斜視図である。FIG. 12 is a perspective view showing first to third battery cells stacked via plate members in the manufacture of a battery stack according to an embodiment of the present invention. 図１３Ａは、本発明の一実施形態にかかる電池積層体の製造において、第１電池セル及び第３電池セルの対向する電極タブを第２かしめ部材を用いて電気的に接続する工程を示した斜視図、図１３Ｂはその正面図である。FIG. 13A shows a process of electrically connecting opposing electrode tabs of the first battery cell and the third battery cell using the second caulking member in the manufacture of the battery stack according to the embodiment of the present invention. A perspective view and FIG. 13B are the front views. 図１４Ａは、本発明の一実施形態にかかる電池積層体の製造において、第２かしめ部材を第２クッション部材で覆う工程を示した斜視図、図１４Ｂはその正面図、図１４Ｃはその側面図である。14A is a perspective view illustrating a process of covering the second caulking member with the second cushion member in the manufacture of the battery stack according to the embodiment of the present invention, FIG. 14B is a front view thereof, and FIG. 14C is a side view thereof. It is. 図１５Ａは、本発明の一実施形態にかかる電池積層体の製造において、第２クッション部材を取り付けた電極タブを折り曲げる工程を示した正面図、図１５Ｂはその側面図である。FIG. 15A is a front view showing a process of bending an electrode tab to which a second cushion member is attached, and FIG. 15B is a side view thereof, in manufacturing the battery stack according to the embodiment of the present invention. 図１６は、本発明の一実施形態にかかる電池積層体の斜視図である。FIG. 16 is a perspective view of a battery stack according to an embodiment of the present invention. 図１７Ａは、本発明の一実施形態にかかる電池積層体の正面図、図１７Ｂはその側面図である。FIG. 17A is a front view of a battery stack according to an embodiment of the present invention, and FIG. 17B is a side view thereof. 図１８は、本発明の電池積層体を構成する別の電池セルの正面側から見た斜視図である。FIG. 18 is a perspective view of another battery cell constituting the battery stack of the present invention as viewed from the front side. 図１９は、本発明の電池積層体を構成する別の板材の正面図である。FIG. 19 is a front view of another plate member constituting the battery laminate of the present invention. 図２０は、本発明の電池積層体を構成する更に別の板材の正面図である。FIG. 20 is a front view of still another plate material constituting the battery laminate of the present invention. 図２１は、本発明の電池積層体を構成する更に別の板材の正面図である。FIG. 21 is a front view of still another plate material constituting the battery stack of the present invention.
　本発明の電池積層体は、複数の薄板状の電池セルが積み重ねられた電池積層体である。前記複数の電池セルのそれぞれは、外周辺から導出された正極タブ及び負極タブを有する。隣り合う電池セルの前記正極タブと前記負極タブとが互いに対向する。前記複数の電池セルが直列に接続されるように、互いに対向する前記正極タブと前記負極タブとがかしめ部材をかしめることにより電気的に接続されている。 The battery laminate of the present invention is a battery laminate in which a plurality of thin battery cells are stacked. Each of the plurality of battery cells has a positive electrode tab and a negative electrode tab derived from the outer periphery. The positive electrode tab and the negative electrode tab of adjacent battery cells face each other. The positive electrode tab and the negative electrode tab facing each other are electrically connected by caulking a caulking member so that the plurality of battery cells are connected in series.
　上記の本発明の電池積層体において、前記かしめ部材が前記電池セルの発電要素に近づくように、互いに電気的に接続された前記正極タブ及び前記負極タブが折り曲げられていることが好ましい。これにより、電池積層体の外寸法を小さくすることができるので、電池積層体を収納する容器を小型化することができる。また、正極タブ及び負極タブに外力が作用する可能性が低減するので、電極タブの損傷が低減する。更に、かしめ部材が容器の内壁に接触して短絡事故が生じる可能性が低減する。 In the battery laminate of the present invention, it is preferable that the positive electrode tab and the negative electrode tab that are electrically connected to each other are bent so that the caulking member approaches the power generation element of the battery cell. Thereby, since the outer dimension of a battery laminated body can be made small, the container which accommodates a battery laminated body can be reduced in size. Moreover, since possibility that an external force will act on a positive electrode tab and a negative electrode tab reduces, damage to an electrode tab reduces. Furthermore, the possibility that a caulking member contacts the inner wall of the container and a short circuit accident occurs is reduced.
　上記の本発明の電池積層体において、圧縮変形可能なクッション部材が前記かしめ部材を覆っていることが好ましい。これにより、電極タブを保護することができる。 In the battery laminate of the present invention described above, it is preferable that a compressible and deformable cushion member covers the caulking member. Thereby, an electrode tab can be protected.
　前記クッション部材が、前記正極タブ又は前記負極タブに固定されていることが好ましい。これにより、正極タブ又は負極タブをクッション部材で補強することができる。 It is preferable that the cushion member is fixed to the positive electrode tab or the negative electrode tab. Thereby, a positive electrode tab or a negative electrode tab can be reinforced with a cushion member.
　前記クッション部材が、前記正極タブ及び前記負極タブとともに折り曲げられていることが好ましい。これにより、電極タブの折り曲げ部分の曲率が小さくなるのを防止することができる。また、クッション部材が電極タブの折り曲げ部分を覆うので、折り曲げ部分に外力が作用する可能性を低減することができる。 It is preferable that the cushion member is bent together with the positive electrode tab and the negative electrode tab. Thereby, it can prevent that the curvature of the bending part of an electrode tab becomes small. Moreover, since the cushion member covers the bent part of the electrode tab, the possibility that an external force acts on the bent part can be reduced.
　前記クッション部材が、前記電池セルの外装に固定されていてもよい。これにより、電極タブに対するクッション部材の補強効果が更に向上する。 The cushion member may be fixed to the exterior of the battery cell. Thereby, the reinforcement effect of the cushion member with respect to an electrode tab further improves.
　隣り合う前記電池セルの間に、前記電池セルが直接的に又は間接的に固定された板材が配置されていることが好ましい。この場合、前記クッション部材が、前記板材に固定されていてもよい。これにより、電極タブに対するクッション部材の補強効果が更に向上する。 It is preferable that a plate material on which the battery cells are fixed directly or indirectly is disposed between the adjacent battery cells. In this case, the cushion member may be fixed to the plate material. Thereby, the reinforcement effect of the cushion member with respect to an electrode tab further improves.
　上記の本発明の電池積層体において、前記かしめ部材が、導電性を有する金属からなることが好ましい。これにより、かしめ部材に配線を接続することにより、配線と電極タブとを電気的に接続することができる。 In the battery laminate of the present invention, the caulking member is preferably made of a conductive metal. Thereby, the wiring and the electrode tab can be electrically connected by connecting the wiring to the caulking member.
　上記の本発明の電池積層体において、前記かしめ部材に配線がかしめられて電気的に接続されていることが好ましい。これにより、配線を電極タブに接続する作業も容易になり、電池積層体の生産効率の向上に有利である。 In the battery laminate of the present invention described above, it is preferable that wiring is caulked to the caulking member and electrically connected. This facilitates the work of connecting the wiring to the electrode tab, which is advantageous in improving the production efficiency of the battery stack.
　以下に、本発明を好適な実施形態を示しながら詳細に説明する。但し、本発明は以下の実施形態に限定されないことはいうまでもない。以下の説明において参照する各図は、説明の便宜上、本発明の実施形態の構成部材のうち、本発明を説明するために必要な主要部材のみを簡略化して示したものである。従って、本発明は以下の各図に示されていない任意の構成部材を備え得る。また、以下の各図中の部材の寸法は、実際の構成部材の寸法および各部材の寸法比率等を忠実に表したものではない。 Hereinafter, the present invention will be described in detail while showing preferred embodiments. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, the drawings referred to in the following description show only the main members necessary for explaining the present invention in a simplified manner among the constituent members of the embodiment of the present invention. Therefore, the present invention can include arbitrary components not shown in the following drawings. In addition, the dimensions of the members in the following drawings do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of the members.
　（電池セル）
　最初に、本発明の一実施形態にかかる電池積層体に使用される電池セルの概略構成を説明する。 (Battery cell)
Initially, schematic structure of the battery cell used for the battery laminated body concerning one Embodiment of this invention is demonstrated.
　図１Ａは、本発明の一実施形態にかかる電池積層体を構成する電池セル１０の正面側から見た斜視図、図１Ｂは、その背面側から見た斜視図である。電池セル１０は、平面視形状が略矩形であり、当該略矩形の縦横寸法に比べて厚みが薄い薄板形状を有する。この電池セル１０では、ラミネートシート１３からなる外装内に、略矩形の平面視形状を有する薄板状の発電要素（図示せず）が電解液とともに封入されている。発電要素は、正極集電体の所定領域の両面に正極活物質を含む正極合剤層が塗布形成された正極と、負極集電体の所定領域の両面に負極活物質を含む負極合剤層が塗布形成された負極とが、セパレータを介して交互に積層されてなる電極積層体である。電池の種類は特に制限はないが、二次電池、中でもリチウムイオン二次電池が好ましい。 FIG. 1A is a perspective view seen from the front side of the battery cell 10 constituting the battery stack according to one embodiment of the present invention, and FIG. 1B is a perspective view seen from the back side. The battery cell 10 has a substantially rectangular shape in plan view, and has a thin plate shape that is thinner than the vertical and horizontal dimensions of the substantially rectangular shape. In the battery cell 10, a thin plate-shaped power generation element (not shown) having a substantially rectangular plan view shape is enclosed in an exterior made of a laminate sheet 13 together with an electrolytic solution. The power generation element includes a positive electrode in which a positive electrode mixture layer including a positive electrode active material is applied and formed on both surfaces of a predetermined region of the positive electrode current collector, and a negative electrode mixture layer including a negative electrode active material on both surfaces of the predetermined region of the negative electrode current collector Is an electrode laminate in which negative electrodes formed by coating are alternately laminated via separators. The type of the battery is not particularly limited, but a secondary battery, particularly a lithium ion secondary battery is preferable.
　ラミネートシート１３は、発電要素に比べて薄く、且つ、可撓性を有している。ラミネートシート１３は、例えば、アルミニウム等からなる基層の、発電要素に対向する側の面に熱融着性樹脂層（例えば変性ポリオレフィン層）が積層された可撓性を有する多層シートであってもよい。１枚の矩形のラミネートシート１３が、発電要素を挟むように下辺（一方の短辺）１４ｚで二つ折りにされ、下辺１４ｚ以外の三辺１４ｘ，１４ｓ，１４ｓに沿って重ね合わされてヒートシール法などによりシールされている。 The laminate sheet 13 is thinner than the power generation element and has flexibility. The laminate sheet 13 may be a flexible multilayer sheet in which a heat-fusible resin layer (for example, a modified polyolefin layer) is laminated on the surface of the base layer made of aluminum or the like on the side facing the power generation element. Good. One rectangular laminate sheet 13 is folded in two at the lower side (one short side) 14z so as to sandwich the power generation element, and is superposed along the three sides 14x, 14s, 14s other than the lower side 14z to be heat-sealed. It is sealed by etc.
　下辺１４ｚに対向する上辺（他方の短辺）１４ｘから、正極タブ１１ｐ及び負極タブ１１ｎが導出されている。正極タブ１１ｐ及び負極タブ１１ｎは、短冊形状を有し、上辺１４ｘに対して直交する方向（即ち、上辺１４ｘに隣接する一対の側辺（長辺）１４ｓと平行な方向）に沿って延びている。正極タブ１１ｐは、例えばアルミニウムの薄板からなり、発電要素を構成する複数の正極集電体（図示せず）と電気的に接続されている。また、負極タブ１１ｎは、例えば銅の薄板、ニッケルメッキされた銅の薄板、または銅／ニッケルのクラッド材等からなり、発電要素を構成する複数の負極集電体（図示せず）と電気的に接続されている。以下の説明では、正極タブ１１ｐ及び負極タブ１１ｎを「電極タブ」と総称することがある。 A positive electrode tab 11p and a negative electrode tab 11n are led out from an upper side (the other short side) 14x facing the lower side 14z. The positive electrode tab 11p and the negative electrode tab 11n have a strip shape and extend along a direction perpendicular to the upper side 14x (that is, a direction parallel to a pair of side sides (long sides) 14s adjacent to the upper side 14x). Yes. The positive electrode tab 11p is made of, for example, an aluminum thin plate, and is electrically connected to a plurality of positive electrode current collectors (not shown) constituting the power generation element. The negative electrode tab 11n is made of, for example, a copper thin plate, a nickel-plated copper thin plate, or a copper / nickel clad material, and is electrically connected to a plurality of negative electrode current collectors (not shown) constituting the power generation element. It is connected to the. In the following description, the positive electrode tab 11p and the negative electrode tab 11n may be collectively referred to as “electrode tabs”.
　図１Ａに示されているように、電池セル１０の正面側では、発電要素に対応する長方形の領域１６が、電池セル１０の三辺１４ｘ，１４ｓ，１４ｓに沿ったラミネートシート１３のシール領域に対して突出している。一方、図１Ｂに示されているように、電池セル１０の裏面は略一平面をなしている。本発明では、説明の便宜のために、図１Ａに示された、発電要素によって長方形の突出領域１６が形成された側の面を電池セル１０の「正面」と呼び、図１Ｂに示された略平面である側の面を電池セル１０の「裏面」と呼ぶ。また、正面と裏面とを結ぶ方向を「厚さ方向」と呼ぶ。 As shown in FIG. 1A, on the front side of the battery cell 10, a rectangular region 16 corresponding to the power generation element is a sealing region of the laminate sheet 13 along the three sides 14 x, 14 s, 14 s of the battery cell 10. Protrusively. On the other hand, as shown in FIG. 1B, the back surface of the battery cell 10 is substantially flat. In the present invention, for convenience of explanation, the surface on the side where the rectangular projecting region 16 is formed by the power generation element shown in FIG. 1A is called the “front” of the battery cell 10 and is shown in FIG. 1B. The surface on the side that is substantially flat is called the “back surface” of the battery cell 10. A direction connecting the front surface and the back surface is referred to as a “thickness direction”.
　（板材）
　本発明の一実施形態にかかる電池積層体を構成する板材を説明する。 (Plate material)
The board | plate material which comprises the battery laminated body concerning one Embodiment of this invention is demonstrated.
　図２Ａは本発明の一実施形態にかかる電池積層体を構成する板材２０の正面図、図２Ｂは当該板材２０の斜視図である。板材２０は、全体として略長方形形状を有している。但し、板材２０の上側の短辺は、その一方の端を切り落とす切り欠き２１を形成することで階段状に形成されている。その結果、板材２０の上側の短辺の他方の端に、上に向かって突出した凸部２２が形成されている。 FIG. 2A is a front view of the plate member 20 constituting the battery stack according to the embodiment of the present invention, and FIG. 2B is a perspective view of the plate member 20. The plate material 20 has a substantially rectangular shape as a whole. However, the upper short side of the plate member 20 is formed in a step shape by forming a notch 21 that cuts off one end thereof. As a result, a convex portion 22 protruding upward is formed at the other end of the upper short side of the plate member 20.
　板材２０は、硬質の実質的に剛体と見なしうる材料からなる。例えば、ポリカーボネート等の絶縁性を有する樹脂材料、銅、アルミニウムなどの熱伝導性に優れた金属材料からなることが好ましい。板材２０の厚さは、板材２０の材料などによって異なるが、０．３ｍｍ以上、更には０．５ｍｍ以上、特に０．８ｍｍ以上であることが好ましい。板材２０の厚さの上限は、電池積層体の全体厚さ等を考慮して適宜設定しうるが、１．５ｍｍ以下、更には１．２ｍｍ以下であることが好ましい。正面から見た板材２０の大きさは、正面から見た電池セル１０の大きさ（正極タブ１１ｐ及び負極タブ１１ｎを含まない）と同等か、若しくはこれより僅かに大きいことが好ましい。 The plate member 20 is made of a hard material that can be regarded as a substantially rigid body. For example, it is preferably made of an insulating resin material such as polycarbonate or a metal material having excellent thermal conductivity such as copper or aluminum. The thickness of the plate member 20 varies depending on the material of the plate member 20 and the like, but is preferably 0.3 mm or more, more preferably 0.5 mm or more, and particularly preferably 0.8 mm or more. The upper limit of the thickness of the plate member 20 can be appropriately set in consideration of the overall thickness of the battery stack, etc., but is preferably 1.5 mm or less, and more preferably 1.2 mm or less. The size of the plate member 20 viewed from the front is preferably equal to or slightly larger than the size of the battery cell 10 viewed from the front (not including the positive electrode tab 11p and the negative electrode tab 11n).
　（電池積層体）
　本発明の一実施形態にかかる電池積層体では、上述した複数の電池セル１０と複数の板材２０とが、電池セル１０と板材２０とが交互に配置されるようにして積み重ねられて、互いに固着されて一体化される。このとき、隣り合う電池セル１０間で正極タブ１１ｐと負極タブ１１ｎとが対向するように、複数の電池セル１０は、その表裏を交互に反転させて積層される。また、上側の短辺において板材２０の凸部２２が左右に交互に配置されるように、板材２０は、その表裏を交互に反転させて積層される。電池積層体を構成する複数の電池セル１０は同一形状を有し、また、電池積層体を構成する複数の板材２０は同一形状を有する。 (Battery stack)
In the battery stack according to the embodiment of the present invention, the plurality of battery cells 10 and the plurality of plate members 20 described above are stacked such that the battery cells 10 and the plate members 20 are alternately arranged and fixed to each other. And integrated. At this time, the plurality of battery cells 10 are stacked by alternately inverting the front and back so that the positive electrode tab 11p and the negative electrode tab 11n face each other between the adjacent battery cells 10. Moreover, the board | plate material 20 is laminated | stacked by reversing the front and back alternately so that the convex part 22 of the board | plate material 20 may be arrange | positioned alternately right and left in the upper short side. The plurality of battery cells 10 constituting the battery stack have the same shape, and the plurality of plate members 20 constituting the battery stack have the same shape.
　以下に、本実施形態の電池積層体の製造方法を説明する。以下の説明において、電池積層体を構成する複数の同一部材の各々を区別する必要がある場合には、部材の名称に「第１」、「第２」、「第３」、・・・等の接頭語を付し、且つ、それらの符号に「ａ」、「ｂ」、「ｃ」、・・・等のアルファベットの添え字を付す。 Hereinafter, a method for manufacturing the battery stack of this embodiment will be described. In the following description, when it is necessary to distinguish each of a plurality of the same members constituting the battery stack, the names of the members are “first”, “second”, “third”,... And suffixes of alphabets such as “a”, “b”, “c”,...
　最初に、図３Ａ及び図３Ｂに示すように、一対の側辺１４ｓ，１４ｓに沿ったラミネートシート１３のシール部分を、突出領域１６の側に略直角に折り曲げる。これは、本例では、図１Ａに示す電池セル１０の幅Ｗ１０が、図２に示す板材２０の幅Ｗ２０より僅かに大きいからである。図３Ａ及び図３Ｂに示すように一対の側辺１４ｓ，１４ｓを折り曲げることにより、電池セル１０の幅Ｗ１０'は、板材２０の幅Ｗ２０より小さくなる。但し、一対の側辺１４ｓ，１４ｓが折り曲げられていない電池セル１０の幅Ｗ１０（図１Ａ参照）が板材２０の幅Ｗ２０（図２Ａ参照）と同じかまたはこれより小さい場合には、図３Ａ及び図３Ｂに示すように電池セル１０の一対の側辺１４ｓ，１４ｓを折り曲げる必要はない。 First, as shown in FIGS. 3A and 3B, the seal portion of the laminate sheet 13 along the pair of side sides 14 s and 14 s is bent at a substantially right angle toward the protruding region 16. This is because in this example, the width W10 of the battery cell 10 shown in FIG. 1A is slightly larger than the width W20 of the plate member 20 shown in FIG. As shown in FIGS. 3A and 3B, the width W10 ′ of the battery cell 10 becomes smaller than the width W20 of the plate member 20 by bending the pair of side sides 14s and 14s. However, when the width W10 (see FIG. 1A) of the battery cell 10 in which the pair of side sides 14s, 14s is not bent is the same as or smaller than the width W20 (see FIG. 2A) of the plate member 20, FIG. As shown in FIG. 3B, it is not necessary to bend the pair of side sides 14s, 14s of the battery cell 10.
　次に、図４Ａ、図４Ｂ、図４Ｃに示すように、第１電池セル１０ａと第１板材２０ａとを接合する。本例では、第１電池セル１０ａの正面、即ち突出領域１６（図３Ａ参照）の頂面を第１板材２０ａに固定している。第１電池セル１０ａの正極タブ１１ｐが、第１板材２０ａの凸部２２に対向している。図４Ｂに示されているように、第１電池セル１０ａの上辺１４ｘから突出した正極タブ１１ｐ及び負極タブ１１ｎが、第１板材２０ａの凸部２２よりも上に延びている。第１電池セル１０ａの下辺１４ｚ及び一対の側辺１４ｓ，１４ｓよりも第１板材２０ａが僅かにはみ出している。電池セル１０と板材２０との接合方法は特に制限はなく、例えば、両面粘着テープや接着剤を用いることができる。特に、両面粘着テープにより固定する方法は、電池積層体１の積層工程を簡単且つ迅速に行うことができるので好ましい。 Next, as shown in FIGS. 4A, 4B, and 4C, the first battery cell 10a and the first plate member 20a are joined. In this example, the front surface of the first battery cell 10a, that is, the top surface of the protruding region 16 (see FIG. 3A) is fixed to the first plate member 20a. The positive electrode tab 11p of the first battery cell 10a faces the convex portion 22 of the first plate member 20a. As shown in FIG. 4B, the positive electrode tab 11p and the negative electrode tab 11n protruding from the upper side 14x of the first battery cell 10a extend above the convex portion 22 of the first plate member 20a. The first plate member 20a slightly protrudes from the lower side 14z and the pair of side sides 14s, 14s of the first battery cell 10a. There is no restriction | limiting in particular in the joining method of the battery cell 10 and the board | plate material 20, For example, a double-sided adhesive tape and an adhesive agent can be used. In particular, the method of fixing with a double-sided pressure-sensitive adhesive tape is preferable because the stacking process of the battery stack 1 can be performed easily and quickly.
　次に、図５に示すように、第１板材２０ａの第１電池セル１０ａが固定された面とは反対側の面に、第２電池セル１０ｂを固定する。このとき、第２電池セル１０ｂの正極タブ１１ｐ及び負極タブ１１ｎが、第１電池セル１０ａの負極タブ１１ｎ及び正極タブ１１ｐにそれぞれ対向するように、第２電池セル１０ｂは第１板材２０ａに固定される。即ち、第２電池セル１０ｂの突出領域１６の頂面が第１板材２０ａに固定される。 Next, as shown in FIG. 5, the 2nd battery cell 10b is fixed to the surface on the opposite side to the surface where the 1st battery cell 10a of the 1st board | plate material 20a was fixed. At this time, the second battery cell 10b is fixed to the first plate member 20a so that the positive electrode tab 11p and the negative electrode tab 11n of the second battery cell 10b face the negative electrode tab 11n and the positive electrode tab 11p of the first battery cell 10a, respectively. Is done. That is, the top surface of the protruding region 16 of the second battery cell 10b is fixed to the first plate member 20a.
　図６に、第１板材２０ａの一方の面に第１電池セル１０ａが、他方の面に第２電池セル１０ｂが、それぞれ固定された状態を示す。第１電池セル１０ａの負極タブ１１ｎと第２電池セル１０ｂの正極タブ１１ｐとが対向し、第１電池セル１０ａの正極タブ１１ｐと第２電池セル１０ｂの負極タブ１１ｎとが、第１板材２０ａの凸部２２を挟んで対向している。 FIG. 6 shows a state where the first battery cell 10a is fixed to one surface of the first plate member 20a and the second battery cell 10b is fixed to the other surface. The negative electrode tab 11n of the first battery cell 10a and the positive electrode tab 11p of the second battery cell 10b face each other, and the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the second battery cell 10b are in contact with the first plate member 20a. Are opposed to each other with the convex portion 22 therebetween.
　次に、互いに対向する第１電池セル１０ａの負極タブ１１ｎと第２電池セル１０ｂの正極タブ１１ｐとを、これらにかしめ部材をかしめることにより電気的に接続する。図７は、本実施形態において使用されるかしめ部材３０の斜視図である。略長方形の金属製の板材が、その中央で略直角に折り曲げられている。折り曲げ位置に対して一方の側の第１片３１及び他方の側の第２片３２の互いに対向する側（かしめ部材３０の谷折り側）の面には、複数の王冠状（またははとめ状）の突起３３が突出している。第１片３１の側辺には、配線を接続するための略円筒形状の配線端子３５が突出して形成されている。かしめ部材３０の谷折り側に、正極タブ１１ｐ及び負極タブ１１ｎを重ね合わせて挿入し、正極タブ１１ｐ及び負極タブ１１ｎに第１片３１及び第２片３２が重なるようにかしめ部材３０を塑性変形させて二つ折りして、正極タブ１１ｐ及び負極タブ１１ｎに圧着する。突起３３が正極タブ１１ｐ及び負極タブ１１ｎを刺通し、これらの表面の酸化皮膜を破壊して、正極タブ１１ｐと負極タブ１１ｎ、更にこれらとかしめ部材３０とが電気的に接続される。かしめ部材３０の材料は特に制限はないが、導電性を有する金属材料であることが好ましく、例えば銅にニッケルメッキ又は錫メッキを施した材料や真鍮を用いることができる。 Next, the negative electrode tab 11n of the first battery cell 10a and the positive electrode tab 11p of the second battery cell 10b facing each other are electrically connected to each other by caulking a caulking member. FIG. 7 is a perspective view of the caulking member 30 used in the present embodiment. A substantially rectangular metal plate is bent at a substantially right angle at the center thereof. A plurality of crown-shaped (or snap-shaped) shapes are formed on the surfaces of the first piece 31 on one side and the second piece 32 on the other side facing each other (the valley folding side of the caulking member 30) with respect to the bending position. ) Is protruding. On the side of the first piece 31, a substantially cylindrical wiring terminal 35 for connecting wiring is formed so as to protrude. The positive electrode tab 11p and the negative electrode tab 11n are overlapped and inserted on the valley fold side of the caulking member 30, and the caulking member 30 is plastically deformed so that the first piece 31 and the second piece 32 overlap the positive electrode tab 11p and the negative electrode tab 11n. Then, it is folded in half and crimped to the positive electrode tab 11p and the negative electrode tab 11n. The protrusion 33 penetrates the positive electrode tab 11p and the negative electrode tab 11n, breaks the oxide film on these surfaces, and the positive electrode tab 11p, the negative electrode tab 11n, and these and the caulking member 30 are electrically connected. The material of the caulking member 30 is not particularly limited, but is preferably a conductive metal material. For example, a material obtained by applying nickel plating or tin plating to copper or brass can be used.
　図８Ａ及び図８Ｂに、第１電池セル１０ａの負極タブ１１ｎと第２電池セル１０ｂの正極タブ１１ｐとを第１かしめ部材３０ａで電気的に接続した状態を示す。図示を省略するが、第１かしめ部材３０ａの配線端子３５に、電圧監視用の配線を接続してもよい。配線端子３５と配線との接続方法は特に制限はなく、かしめによる方法、はんだを用いる方法などを採用しうるが、かしめによる方法は、接続作業が容易であるので好ましい。即ち、電圧監視用の配線の末端を中空円筒形状を有する配線端子３５内に挿入した状態で配線端子３５をその直径方向に圧縮して塑性変形させる。このように、配線端子３５を電圧監視用の配線とともにかしめることにより、配線を配線端子３５に接続することができる。電圧監視用の配線を接続することにより、例えば電池積層体を構成する複数の電池セルのそれぞれの電圧を監視することができる。なお、第１かしめ部材３０ａの配線端子３５に電圧監視用の配線を接続しない場合には、第１かしめ部材３０ａが配線端子３５を備えていなくてもよい。 8A and 8B show a state where the negative electrode tab 11n of the first battery cell 10a and the positive electrode tab 11p of the second battery cell 10b are electrically connected by the first caulking member 30a. Although illustration is omitted, a voltage monitoring wiring may be connected to the wiring terminal 35 of the first caulking member 30a. The method for connecting the wiring terminal 35 and the wiring is not particularly limited, and a method using caulking, a method using solder, or the like can be adopted. However, the method using caulking is preferable because the connecting operation is easy. That is, with the terminal of the voltage monitoring wiring inserted into the wiring terminal 35 having a hollow cylindrical shape, the wiring terminal 35 is compressed in the diameter direction to be plastically deformed. Thus, the wiring can be connected to the wiring terminal 35 by caulking the wiring terminal 35 together with the voltage monitoring wiring. By connecting the voltage monitoring wiring, for example, it is possible to monitor the voltage of each of the plurality of battery cells constituting the battery stack. In addition, when the voltage monitoring wiring is not connected to the wiring terminal 35 of the first caulking member 30 a, the first caulking member 30 a may not include the wiring terminal 35.
　次に、図９Ａ、図９Ｂ、図９Ｃに示すように、第１かしめ部材３０ａを第１クッション部材４０ａで覆う。第１クッション部材４０ａは、可撓性を有し、また、押力を加えると容易に圧縮変形し、当該押力を解除すると直ちに初期の状態に戻る特性を有していることが好ましい。第１クッション部材４０ａの材料は、特に制限はないが、例えば、柔軟な多孔質材料、いわゆるスポンジを用いることができる。具体的には、ウレタンフォーム、発泡ポリエチレン、ゴムスポンジなどを用いることができる。第１クッション部材４０ａが絶縁性を有することは、第１かしめ部材３０ａが周囲の部材（例えば、積層方向に隣り合う他のかしめ部材、電池積層体を収納する容器の内壁など）に接触して短絡するのを防止するのに有利である。 Next, as shown in FIGS. 9A, 9B, and 9C, the first caulking member 30a is covered with the first cushion member 40a. It is preferable that the first cushion member 40a is flexible and has a characteristic that it easily compresses and deforms when a pressing force is applied and immediately returns to the initial state when the pressing force is released. Although the material of the 1st cushion member 40a does not have a restriction | limiting in particular, For example, a flexible porous material, what is called sponge can be used. Specifically, urethane foam, polyethylene foam, rubber sponge and the like can be used. The first cushion member 40a is insulative because the first caulking member 30a comes into contact with surrounding members (for example, other caulking members adjacent to each other in the stacking direction, the inner wall of the container that stores the battery stack, etc.). It is advantageous to prevent short circuit.
　第１かしめ部材３０ａに取り付ける前の第１クッション部材４０ａは、例えば長方形状（または短冊状）を有している。この第１クッション部材４０ａを、第１かしめ部材３０ａの上端に接触させて、第１かしめ部材３０ａの両面に重なるように折り曲げて、第１かしめ部材３０ａに固定する。第１かしめ部材３０ａの電極端子３５も第１クッション部材４０ａで覆うことが好ましい。第１クッション部材４０ａは、電極タブ１１ｐ，１１ｎまで延び、これらに固定されていることが好ましい。第１クッション部材４０ａは、更に電池セル１０のラミネートシート１３又は板材２０まで延び、これらに固定されていてもよい。 The first cushion member 40a before being attached to the first caulking member 30a has, for example, a rectangular shape (or a strip shape). The first cushion member 40a is brought into contact with the upper end of the first caulking member 30a, bent so as to overlap both surfaces of the first caulking member 30a, and fixed to the first caulking member 30a. The electrode terminal 35 of the first caulking member 30a is also preferably covered with the first cushion member 40a. The first cushion member 40a preferably extends to and is fixed to the electrode tabs 11p and 11n. The first cushion member 40a may further extend to the laminate sheet 13 or the plate material 20 of the battery cell 10 and be fixed thereto.
　第１クッション部材４０ａを固定する方法は特に制限はなく、例えば、第１クッション部材４０ａの第１かしめ部材３０ａに接する側の面に両面粘着テープ又は接着剤を付与することができる。特に、両面粘着テープにより固定する方法は、電池積層体の積層工程を簡単且つ迅速に行うことができるので好ましい。 The method for fixing the first cushion member 40a is not particularly limited, and for example, a double-sided pressure-sensitive adhesive tape or an adhesive can be applied to the surface of the first cushion member 40a that is in contact with the first caulking member 30a. In particular, the method of fixing with a double-sided pressure-sensitive adhesive tape is preferable because the battery stack can be easily and quickly laminated.
　次に、図１０Ａ、図１０Ｂ、図１０Ｃに示すように、第１クッション部材４０ａを取り付けた電極タブ１１ｐ，１１ｎを折り曲げる。電極タブ１１ｐ，１１ｎの折り曲げ部分にも第１クッション部材４０ａが固定されている場合には、第１クッション部材４０ａも電極タブ１１ｐ，１１ｎとともに折り曲げられる。図１０Ｃに示すように、折り曲げられた電極タブ１１ｐ，１１ｎに取り付けられた第１クッション部材４０ａの上端は、第１板材２０ａの凸部２２の上端とほぼ同じ高さか、若しくはこれより低い。 Next, as shown in FIGS. 10A, 10B, and 10C, the electrode tabs 11p and 11n to which the first cushion member 40a is attached are bent. When the first cushion member 40a is also fixed to the bent portions of the electrode tabs 11p and 11n, the first cushion member 40a is also bent together with the electrode tabs 11p and 11n. As shown in FIG. 10C, the upper end of the first cushion member 40a attached to the bent electrode tabs 11p and 11n is substantially the same height as or lower than the upper end of the convex portion 22 of the first plate member 20a.
　次に、図１１に示すように、第１電池セル１０ａに第２板材２０ｂを介して第３電池セル１０ｃを接合する。このとき、第２板材２０ｂの凸部２２が第１クッション部材４０ａと対向するように、第２板材２０ｂは第１電池セル１０ａに固定される。また、第３電池セル１０ｃの突出領域１６とは反対側の面が第２板材２０ｂに向くように、第３電池セル１０ｃは第２板材２０ｂに固定される。 Next, as shown in FIG. 11, the third battery cell 10c is joined to the first battery cell 10a via the second plate member 20b. At this time, the 2nd board | plate material 20b is fixed to the 1st battery cell 10a so that the convex part 22 of the 2nd board | plate material 20b may oppose the 1st cushion member 40a. The third battery cell 10c is fixed to the second plate member 20b so that the surface of the third battery cell 10c opposite to the protruding region 16 faces the second plate member 20b.
　図１２に、第２電池セル１０ｂ、第１板材２０ａ、第１電池セル１０ａ、第２板材２０ｂ、第３電池セル１０ｃがこの順に接合された状態を示す。第１電池セル１０ａの正極タブ１１ｐと第３電池セル１０ｃの負極タブ１１ｎとが対向し、第１クッション部材４０ａと第３電池セル１０ｃの正極タブ１１ｐとが、第２板材２０ｂの凸部２２を挟んで対向している。 FIG. 12 shows a state in which the second battery cell 10b, the first plate member 20a, the first battery cell 10a, the second plate member 20b, and the third battery cell 10c are joined in this order. The positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the third battery cell 10c are opposed to each other, and the first cushion member 40a and the positive electrode tab 11p of the third battery cell 10c are the convex portion 22 of the second plate member 20b. It is opposed across the.
　次に、互いに対向する第１電池セル１０ａの正極タブ１１ｐと第３電池セル１０ｃの負極タブ１１ｎとを、これらに第２かしめ部材３０ｂ（図７参照）をかしめることにより電気的に接続する。図１３Ａ及び図１３Ｂに、第１電池セル１０ａの正極タブ１１ｐと第３電池セル１０ｃの負極タブ１１ｎとを第２かしめ部材３０ｂで電気的に接続した状態を示す。第２かしめ部材３０ｂによる接続方法は、図８Ａ及び図８Ｂの第１かしめ部材３０ａを用いた場合と同じである。図示を省略するが、第２かしめ部材３０ｂの配線端子３５に、電圧監視用の配線を接続してもよいことは図８Ａ及び図８Ｂと同じである。 Next, the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the third battery cell 10c facing each other are electrically connected to each other by caulking a second caulking member 30b (see FIG. 7). . 13A and 13B show a state where the positive electrode tab 11p of the first battery cell 10a and the negative electrode tab 11n of the third battery cell 10c are electrically connected by the second caulking member 30b. The connection method using the second caulking member 30b is the same as that using the first caulking member 30a shown in FIGS. 8A and 8B. Although illustration is omitted, the voltage monitoring wiring may be connected to the wiring terminal 35 of the second caulking member 30b as in FIGS. 8A and 8B.
　次に、図１４Ａ、図１４Ｂ、図１４Ｃに示すように、図９Ａ、図９Ｂ、図９Ｃで説明したのと同様にして、第２クッション部材４０ｂで第２かしめ部材３０ｂを覆う。 Next, as shown in FIGS. 14A, 14B, and 14C, the second caulking member 30b is covered with the second cushion member 40b in the same manner as described in FIGS. 9A, 9B, and 9C.
　次に、図１５Ａ、図１５Ｂに示すように、図１０Ａ、図１０Ｂ、図１０Ｃで説明したのと同様にして、第２クッション部材４０ｂを取り付けた電極タブ１１ｐ，１１ｎを折り曲げる。 Next, as shown in FIGS. 15A and 15B, the electrode tabs 11p and 11n to which the second cushion member 40b is attached are bent in the same manner as described in FIGS. 10A, 10B, and 10C.
　その後、上記と同様にして、（１）板材２０を介して電池セル１０を積層する、（２）隣り合う電池セル間の、板材２０の切り欠き２１（図２Ａ参照）を介して対向する電極タブ１１ｐ，１１ｎをかしめ部材３０を用いて電気的に接続する、（３）クッション部材４０でかしめ部材３０を覆う、（４）かしめ部材３０でかしめられた電極タブ１１ｐ，１１ｎを折り曲げる、の各工程を、必要な数だけ繰り返す。 Thereafter, in the same manner as described above, (1) the battery cells 10 are stacked via the plate material 20, and (2) the electrodes facing each other through the notches 21 (see FIG. 2A) of the plate material 20 between adjacent battery cells. The tabs 11p and 11n are electrically connected using the caulking member 30, (3) the caulking member 30 is covered with the cushion member 40, and (4) the electrode tabs 11p and 11n caulked by the caulking member 30 are bent. Repeat the process as many times as necessary.
　図１６は、かくして得られた本実施形態にかかる電池積層体１の斜視図、図１７Ａは電池積層体１の正面図、図１７Ｂは電池積層体１の側面図である。この電池積層体１では、７つの電池セル１０ａ～１０ｇが６つの板材２０ａ～２０ｆを介して積層されて一体化されている。板材２０を介して隣り合う電池セル１０の互いに対向する正極タブ１１ｐと負極タブ１１ｎとにかしめ部材３０をかしめることにより、７つの電池セル１０ａ～１０ｇが直列に接続されている。各かしめ部材３０はクッション部材４０で覆われる。そして、かしめ部材３０が突出領域１６に近づくように、かしめ部材３０でかしめられた正極タブ１１ｐ及び負極タブ１１ｎが折り曲げられている。クッション部材４０は、隣り合う２つの電池セル１０の突出領域１６によって形成された、上辺１４ｘに沿ったラミネートシート１３のヒートシール部分の間の隙間に収納される。 16 is a perspective view of the battery stack 1 according to the present embodiment thus obtained, FIG. 17A is a front view of the battery stack 1, and FIG. 17B is a side view of the battery stack 1. In the battery stack 1, seven battery cells 10a to 10g are stacked and integrated through six plate members 20a to 20f. The seven battery cells 10a to 10g are connected in series by caulking the caulking member 30 to the positive electrode tab 11p and the negative electrode tab 11n facing each other of the adjacent battery cells 10 via the plate member 20. Each caulking member 30 is covered with a cushion member 40. The positive electrode tab 11p and the negative electrode tab 11n that are caulked by the caulking member 30 are bent so that the caulking member 30 approaches the protruding region 16. The cushion member 40 is accommodated in a gap between the heat seal portions of the laminate sheet 13 along the upper side 14x, which is formed by the protruding regions 16 of the two adjacent battery cells 10.
　直列に接続された７つの電池セル１０ａ～１０ｇの両端の正極タブ１１ｐ及び負極タブ１１ｎには、電池積層体１に対して充放電を行うための配線が接続される。配線の接続方法は特に制限はない。図示を省略するが、例えば、上記と同様に、正極タブ１１ｐ及び負極タブ１１ｎのそれぞれにかしめ部材３０を取り付け、かしめ部材３０の配線端子３５に配線をかしめることができる。このかしめ部材３０をクッション部材４０で覆い、更にかしめ部材３０でかしめられた正極タブ１１ｐ及び負極タブ１１ｎをそれぞれ折り曲げてもよい。 Wiring for charging / discharging the battery stack 1 is connected to the positive electrode tab 11p and the negative electrode tab 11n at both ends of the seven battery cells 10a to 10g connected in series. The wiring connection method is not particularly limited. Although illustration is omitted, for example, similarly to the above, the caulking member 30 can be attached to each of the positive electrode tab 11p and the negative electrode tab 11n, and the wiring can be caulked to the wiring terminal 35 of the caulking member 30. The caulking member 30 may be covered with the cushion member 40, and the positive electrode tab 11p and the negative electrode tab 11n caulked by the caulking member 30 may be bent.
　配線が施された電池積層体１は、例えば略直方体形状の内壁で囲まれた収納空間を有する容器に収納されて使用される。 The battery stack 1 provided with the wiring is used by being stored in a container having a storage space surrounded by an inner wall having a substantially rectangular parallelepiped shape, for example.
　以上のように、本発明の電池積層体１では、隣り合う電池セルの互いに対向する異極の電極タブが、かしめ部材３０をかしめることにより電気的に接続される。かしめ部材３０をかしめる作業は、例えば所定の工具を用いて簡単に行うことができる。従って、従来の超音波溶接法や抵抗溶接法に比べて作業効率が良好であり、生産効率の向上に有利である。 As described above, in the battery stack 1 of the present invention, the electrode tabs of opposite polarities facing each other in adjacent battery cells are electrically connected by caulking the caulking member 30. The operation of caulking the caulking member 30 can be easily performed using, for example, a predetermined tool. Accordingly, the working efficiency is better than the conventional ultrasonic welding method and resistance welding method, which is advantageous for improving the production efficiency.
　更に、かしめ部材３０が配線端子３５を備えているので、電極タブに配線を接続するためには、配線端子３５を配線とともにかしめるだけでよい。このように、配線をかしめ法により接続することができるので、電池積層体１に対して充放電を行うための配線や、各電池セルの電圧を監視するための配線を電極タブに接続する作業も極めて簡単である。 Furthermore, since the caulking member 30 includes the wiring terminal 35, in order to connect the wiring to the electrode tab, it is only necessary to crimp the wiring terminal 35 together with the wiring. As described above, since the wiring can be connected by the caulking method, the wiring for charging / discharging the battery stack 1 and the wiring for monitoring the voltage of each battery cell are connected to the electrode tab. Is also very simple.
　かしめ部材３０をクッション部材４０で覆うことにより、電極タブを保護することができる。即ち、外力がかしめ部材３０に直接作用することがなく、クッション部材４０が当該外力を緩和する。従って、電極タブに作用する外力も緩和され、電極タブが保護される。例えば、電池積層体１を容器に収納した場合に、かしめ部材３０が容器の内壁に直接接触するのをクッション部材４０が防止する。これにより、電池積層体１を収納した容器に振動や衝撃が加えられることにより電池積層体１が容器内の内壁に衝突しても、かしめ部材３０が取り付けられた電極タブに作用する外力をクッション部材４０が緩和する。 The electrode tab can be protected by covering the caulking member 30 with the cushion member 40. That is, the external force does not directly act on the caulking member 30, and the cushion member 40 relieves the external force. Therefore, the external force acting on the electrode tab is also alleviated and the electrode tab is protected. For example, when the battery stack 1 is housed in a container, the cushion member 40 prevents the caulking member 30 from coming into direct contact with the inner wall of the container. As a result, even if the battery stack 1 collides against the inner wall of the container due to vibration or impact applied to the container containing the battery stack 1, the external force acting on the electrode tab to which the caulking member 30 is attached is cushioned. The member 40 relaxes.
　クッション部材４０が絶縁性を有していると、かしめ部材３０のその周囲の部材に対する絶縁性が向上する。即ち、クッション部材４０は、電池セル１０の積層方向に隣り合うかしめ部材３０同士が電気的に接触するのを防止する。また、電池積層体１を容器に収納した場合には、クッション部材４０は、かしめ部材３０が容器の内壁に電気的に接触するのを防止する。 When the cushion member 40 has insulation, the insulation of the caulking member 30 with respect to the surrounding members is improved. That is, the cushion member 40 prevents the caulking members 30 adjacent in the stacking direction of the battery cells 10 from being in electrical contact with each other. Further, when the battery stack 1 is stored in a container, the cushion member 40 prevents the caulking member 30 from being in electrical contact with the inner wall of the container.
　かしめ部材３０でかしめられた電極タブを折り曲げることにより、電池セル１０の積層方向に沿って見たとき、かしめ部材３０やこれを覆うクッション部材４０が板材２０の凸部２２よりも上方に突出しない（図１７Ａ参照）ようにすることが可能である。従って、内容積がより小さな容器に電池積層体１を収納することができるので、容器の小型化が可能である。また、電池積層体１を収納した容器に振動や衝撃が加えられても電極タブに外力が作用する可能性を低減することができるので、電極タブの損傷が低減する。更に、かしめ部材３０が電池積層体１を収納した容器の内壁に接触して短絡事故が発生する可能性も低減する。 By bending the electrode tab crimped by the caulking member 30, the caulking member 30 and the cushion member 40 covering the caulking member 30 do not protrude above the convex portion 22 of the plate member 20 when viewed along the stacking direction of the battery cells 10. (See FIG. 17A). Accordingly, since the battery stack 1 can be stored in a container having a smaller internal volume, the container can be reduced in size. In addition, the possibility of external force acting on the electrode tab even when vibration or impact is applied to the container in which the battery stack 1 is stored can reduce the damage on the electrode tab. Furthermore, the possibility that a short circuit accident will occur due to the caulking member 30 coming into contact with the inner wall of the container in which the battery stack 1 is stored is reduced.
　上記の実施形態のように、クッション部材４０を延長して、クッション部材４０をかしめ部材３０でかしめられた電極タブにも固定すると、電極タブをクッション部材４０で補強することができる。これにより、外部からの衝撃による圧縮や屈曲、あるいは、かしめ部材３０に接続された配線を介した張力をクッション部材４０が緩和するので、電極タブが破損するのを防ぐことができる。 When the cushion member 40 is extended and fixed to the electrode tab that is caulked by the caulking member 30 as in the above embodiment, the electrode tab can be reinforced by the cushion member 40. Thereby, since the cushion member 40 relieves the compression and bending due to the impact from the outside, or the tension through the wiring connected to the caulking member 30, it is possible to prevent the electrode tab from being damaged.
　クッション部材４０が固定された電極タブをクッション部材とともに折り曲げることにより、電極タブの折り曲げ部分の曲率が小さくなるのを防止することができるので、折り曲げによる電極タブの機械的強度の低下や損傷を低減することができる。また、クッション部材が電極タブの折り曲げ部分を覆うので、折り曲げ部分に外力が作用する可能性を低減することができる。 By bending the electrode tab to which the cushion member 40 is fixed together with the cushion member, it is possible to prevent the curvature of the bent portion of the electrode tab from being reduced, thereby reducing the decrease in mechanical strength and damage of the electrode tab due to bending. can do. Moreover, since the cushion member covers the bent part of the electrode tab, the possibility that an external force acts on the bent part can be reduced.
　クッション部材４０を更に延長して、電池セル１０のラミネートシート１３又は板材２０に固定してもよい。これにより、クッション部材４０の電極タブに対する上記の補強効果が更に向上する。従って、例えばかしめ部材３０に接続された配線に張力が印加されても、クッション部材４０が当該張力に対抗するので、電極タブの損傷を防止することができる。 The cushion member 40 may be further extended and fixed to the laminate sheet 13 or the plate material 20 of the battery cell 10. Thereby, said reinforcement effect with respect to the electrode tab of the cushion member 40 further improves. Therefore, for example, even if a tension is applied to the wiring connected to the caulking member 30, the cushion member 40 resists the tension, so that the electrode tab can be prevented from being damaged.
　クッション部材４０が、引っ張り強度が大きな材料からなる層を有していてもよい。これにより、かしめ部材３０に接続された配線を介して印加される張力に対してクッション部材４０が対抗するので、電極タブに作用する張力が緩和される。 The cushion member 40 may have a layer made of a material having a high tensile strength. Thereby, since the cushion member 40 opposes the tension | tensile_strength applied via the wiring connected to the crimping member 30, the tension | tensile_strength which acts on an electrode tab is relieve | moderated.
　上記の実施形態は一例に過ぎない。本発明は、上記の実施形態に限定されず、適宜変更することができる。 The above embodiment is merely an example. The present invention is not limited to the above embodiment, and can be modified as appropriate.
　正極タブ１１ｐと負極タブ１１ｎとを電気的に接続するためのかしめ部材の構成は、上記の実施形態に限定されない。電極タブに配線を接続する方法は、上記の実施形態で説明したかしめによる方法以外の方法、例えば、はんだ、溶接など任意の方法であってもよい。 The structure of the caulking member for electrically connecting the positive electrode tab 11p and the negative electrode tab 11n is not limited to the above embodiment. The method for connecting the wiring to the electrode tab may be any method other than the method by caulking described in the above embodiment, for example, any method such as soldering or welding.
　上記の実施形態では、かしめ部材３０でかしめられた電極タブを折り曲げたが、当該折り曲げを省略してもよい。この場合、かしめ部材３０やこれを覆うクッション部材４０が板材２０の凸部２２から上方に突出することがないように、凸部２２の上方への突出量を大きくすることが好ましい。 In the above embodiment, the electrode tab crimped by the caulking member 30 is bent, but the bending may be omitted. In this case, it is preferable to increase the upward protrusion amount of the convex portion 22 so that the caulking member 30 and the cushion member 40 covering the same do not protrude upward from the convex portion 22 of the plate member 20.
　かしめ部材３０をクッション部材４０で覆う方法は上記の実施形態に限定されない。かしめ部材３０の大部分（好ましくはその全て）が露出しないようにクッション部材４０を取り付ければよい。上記の実施形態のように、クッション部材４０をかしめ部材３０の上端に当接させて折り曲げる方法の他、クッション部材４０をかしめ部材３０の側辺に当接させて折り曲げる方法、予め袋状に形成したクッション部材４０をかしめ部材３０に被せる方法など、任意の方法を採用しうる。 The method of covering the caulking member 30 with the cushion member 40 is not limited to the above embodiment. The cushion member 40 may be attached so that most (preferably all) of the caulking member 30 is not exposed. In addition to the method of folding the cushion member 40 in contact with the upper end of the caulking member 30 as in the above embodiment, the method of bending the cushion member 40 in contact with the side of the caulking member 30 is formed in a bag shape in advance. Arbitrary methods, such as a method of covering the caulking member 30 with the cushion member 40, can be adopted.
　かしめ部材３０を覆うクッション部材４０を省略してもよい。 The cushion member 40 that covers the caulking member 30 may be omitted.
　本発明の電池セル１０は、図１Ａ及び図１Ｂに示した構成に限定されず、任意の薄型の電池セルであってもよい。例えば、上記の電池セル１０では、１枚のラミネートシート１３が下辺１４ｚで二つ折りにされて、下辺１４ｚを除く３辺に沿ってラミネートシート１３がシールされた三方シールタイプの電池セルであったが、図１８に示すように、同一サイズの長方形の２枚のラミネートシート１３で発電要素を挟み、下辺１４ｚを含む４辺に沿ってシールした四方シールタイプの電池セル１０であってもよい。 The battery cell 10 of the present invention is not limited to the configuration shown in FIGS. 1A and 1B, and may be any thin battery cell. For example, the battery cell 10 is a three-side sealed battery cell in which one laminate sheet 13 is folded in two at the lower side 14z and the laminate sheet 13 is sealed along three sides except the lower side 14z. However, as shown in FIG. 18, a battery cell 10 of a four-sided seal type in which a power generation element is sandwiched between two rectangular laminate sheets 13 having the same size and sealed along four sides including the lower side 14 z may be used.
　上記の電池セル１０では、共通する短辺１４ｘから正極タブ１１ｐ及び負極タブ１１ｎが導出されていたが、正極タブ１１ｐ及び負極タブ１１ｎが一対の側辺（長辺）１４ｓのいずれか一方から導出されていてもよい。あるいは、正極タブ１１ｐ及び負極タブ１１ｎが異なる辺からそれぞれ導出されていてもよい。 In the battery cell 10 described above, the positive electrode tab 11p and the negative electrode tab 11n are derived from the common short side 14x. However, the positive electrode tab 11p and the negative electrode tab 11n are derived from one of the pair of side sides (long sides) 14s. May be. Alternatively, the positive electrode tab 11p and the negative electrode tab 11n may be derived from different sides.
　板材２０の平面視形状も上記の実施形態に限定されない。例えば、図１９に示すように、上側の短辺の両端部分を除く中央部分に切り欠き２１が形成されていてもよい。あるいは、図２０に示すように、上側の短辺の両端部分及び中央部分を除く部分に２つの切り欠き２１が形成されていてもよい。あるいは、図２１に示すように、上側の短辺の中央部分を除く両端部分に２つの切り欠き２１が形成されていてもよい。図１９～図２１の板材２０を用いた場合、板材２０の一方の側の電池セルの２つの電極タブと他方の側の電池セルの２つの電極タブとは切り欠き２１内で対向する。 The planar view shape of the plate member 20 is not limited to the above embodiment. For example, as shown in FIG. 19, the notch 21 may be formed in the center part except the both ends of the upper short side. Or as shown in FIG. 20, the two notches 21 may be formed in the part except the both ends and center part of an upper short side. Or as shown in FIG. 21, the two notches 21 may be formed in the both ends except the center part of an upper short side. When the plate member 20 of FIGS. 19 to 21 is used, the two electrode tabs of the battery cell on one side of the plate member 20 and the two electrode tabs of the battery cell on the other side face each other in the notch 21.
　電池セル１０は、板材２０に直接的に固定されていてもよいし、圧縮性を有する緩衝部材や、絶縁性を有する絶縁シート、伝熱特性に優れた伝熱板などを介して板材２０に間接的に固定されていてもよい。 The battery cell 10 may be directly fixed to the plate member 20, or may be attached to the plate member 20 via a compressible buffer member, an insulating sheet having insulation properties, a heat transfer plate having excellent heat transfer characteristics, or the like. It may be fixed indirectly.
　板材２０を用いることなく、隣り合う電池セル１０を接合してもよい。 Adjacent battery cells 10 may be joined without using the plate material 20.
　電池積層体１を構成する電池セル１０の数及び板材２０の数は、上記の実施形態に限定されず、任意に設定することができる。 The number of battery cells 10 and the number of plate members 20 constituting the battery stack 1 are not limited to the above embodiment, and can be arbitrarily set.
　電池積層体１の製造方法は、上記の実施形態に限定されない。新たな電池セルを同じ側に順次積層してもよいし、交互に反対側に積層してもよい。新たな電池セルを積層するたびにかしめ部材及びクッション部材を取り付けてもよいし、必要な全ての電池セルを積層した後にかしめ部材及びクッション部材を取り付けてもよい。 The method for manufacturing the battery stack 1 is not limited to the above embodiment. New battery cells may be sequentially stacked on the same side, or may be alternately stacked on the opposite side. Each time a new battery cell is stacked, the caulking member and the cushion member may be attached, or after all the necessary battery cells are stacked, the caulking member and the cushion member may be attached.
　本発明の利用分野は特に制限はなく、自動車、バイク、電動アシスト自転車等の各種移動機器、携帯情報端末、無停電電源装置（ＵＰＳ）等の電源に使用される電池積層体として広範囲に利用することができる。特に、衝撃や振動を受けやすい各種移動機器に搭載される電池積層体として好ましく利用することができる。 The field of application of the present invention is not particularly limited, and is widely used as a battery laminate used for power sources of various mobile devices such as automobiles, motorcycles, and electrically assisted bicycles, personal digital assistants, and uninterruptible power supplies (UPS). be able to. In particular, it can be preferably used as a battery laminate mounted on various mobile devices that are susceptible to shock and vibration.
１　電池積層体
１０　電池セル
１１ｐ　正極タブ
１１ｎ　負極タブ
１３　ラミネートシート（外装）
２０　板材
２１　切り欠き
２２　凸部
３０　かしめ部材
４０　クッション部材 DESCRIPTION OF SYMBOLS 1 Battery laminated body 10 Battery cell 11p Positive electrode tab 11n Negative electrode tab 13 Laminate sheet (exterior)
20 Plate material 21 Notch 22 Convex part 30 Caulking member 40 Cushion member

Claims (9)

  1. 　複数の薄板状の電池セルが積み重ねられた電池積層体であって、
    　前記複数の電池セルのそれぞれは、外周辺から導出された正極タブ及び負極タブを有し、
    　隣り合う電池セルの前記正極タブと前記負極タブとが互いに対向し、
    　前記複数の電池セルが直列に接続されるように、互いに対向する前記正極タブと前記負極タブとがかしめ部材をかしめることにより電気的に接続されていることを特徴とする電池積層体。     A battery laminate in which a plurality of thin battery cells are stacked,
    Each of the plurality of battery cells has a positive electrode tab and a negative electrode tab derived from the outer periphery,
    The positive electrode tab and the negative electrode tab of adjacent battery cells face each other,
    The battery laminate, wherein the positive electrode tab and the negative electrode tab facing each other are electrically connected by caulking members so that the plurality of battery cells are connected in series.
  2. 　前記かしめ部材が前記電池セルの発電要素に近づくように、互いに電気的に接続された前記正極タブ及び前記負極タブが折り曲げられている請求項１に記載の電池積層体。 The battery stack according to claim 1, wherein the positive electrode tab and the negative electrode tab that are electrically connected to each other are bent so that the caulking member approaches the power generation element of the battery cell.
  3. 　圧縮変形可能なクッション部材が前記かしめ部材を覆っている請求項１又は２に記載の電池積層体。 The battery laminate according to claim 1 or 2, wherein a compressible and deformable cushion member covers the caulking member.
  4. 　前記クッション部材が、前記正極タブ又は前記負極タブに固定されている請求項３に記載の電池積層体。 The battery laminate according to claim 3, wherein the cushion member is fixed to the positive electrode tab or the negative electrode tab.
  5. 　前記クッション部材が、前記正極タブ及び前記負極タブとともに折り曲げられている請求項３又は４に記載の電池積層体。 The battery laminate according to claim 3 or 4, wherein the cushion member is bent together with the positive electrode tab and the negative electrode tab.
  6. 　前記クッション部材が、前記電池セルの外装に固定されている請求項３～５のいずれかに記載の電池積層体。 The battery laminate according to any one of claims 3 to 5, wherein the cushion member is fixed to an exterior of the battery cell.
  7. 　隣り合う前記電池セルの間に、前記電池セルが直接的に又は間接的に固定された板材が配置されており、
    　前記クッション部材が、前記板材に固定されている請求項３～６のいずれかに記載の電池積層体。     Between the adjacent battery cells, a plate material on which the battery cells are fixed directly or indirectly is disposed,
    The battery laminate according to any one of claims 3 to 6, wherein the cushion member is fixed to the plate member.
  8. 　前記かしめ部材が、導電性を有する金属からなる請求項１～７のいずれかに記載の電池積層体。 The battery laminate according to any one of claims 1 to 7, wherein the caulking member is made of a conductive metal.
  9. 　前記かしめ部材に配線がかしめられて電気的に接続されている請求項１～８のいずれかに記載の電池積層体。 The battery laminate according to any one of claims 1 to 8, wherein wiring is caulked to the caulking member and electrically connected thereto.
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JP2018041611A (en) * 2016-09-07 2018-03-15 株式会社フジクラ Power storage module

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