JP5564886B2 - Multilayer battery, method for manufacturing the same, and method for attaching voltage extraction board - Google Patents

Description

  The present invention relates to a stacked battery, a method for manufacturing the same, and a method for attaching a voltage extraction board.

  A stacked battery in which a plurality of unit cells are stacked has an advantage that it can be easily reduced in thickness and weight. In particular, it is possible to improve the output density and energy density by making the electrode of the single cell a bipolar electrode in which a positive electrode layer and a negative electrode layer are provided on the front and back of the current collector. It can be. Further, when a solid electrolyte is used as the electrolyte of the laminated battery, there is no leakage of liquid from the inside of the battery and no generation of by-product gas, so that the structure is excellent in reliability and does not require a sealing member. . On the other hand, in a stacked battery in which a plurality of bipolar electrodes are stacked via a solid electrolyte layer, a plurality of single cells are connected in series. Therefore, when there is a variation in the performance (capacity or internal resistance) of each unit cell, there arises a problem that the variation in voltage of each unit cell increases due to repeated charge and discharge.

  To solve this problem, a method has been adopted in which each cell is provided with a terminal and the voltage between the terminals is detected to monitor whether each cell is functioning normally. For example, in Patent Document 1, a part of a current collector of a bipolar electrode is exposed without being subjected to insulation treatment, and a voltage detection / capacitance adjustment connector is connected to the exposed portion, whereby the voltage between the single cells is increased. It detects and adjusts the capacity of each battery. Patent Documents 2 and 3 disclose stacked batteries in which single cells are stacked so that terminals are drawn from the single cells and the terminals do not overlap each other when viewed in the stacking direction.

Japanese Patent No. 4100188 JP 2008-108477 A JP 2006-127857 A

  According to the bipolar battery according to Patent Document 1, it is possible to detect the voltage of each single cell in the battery and adjust the capacity without complicating the structure of the battery or impairing the sealing performance of the battery. It is said that. However, in the bipolar battery according to Patent Document 1, it is necessary to align the current collectors (foil) one by one with respect to the notch portion of the connector, and the current collector and the connector are misaligned. It was easy to occur and was not easy to install. Further, in the power storage device according to Patent Document 2, it is necessary to apply a conductive adhesive to connect the terminal and the connector, and there is room for improvement in productivity. These problems could not be solved even by combining Patent Documents 1 to 3.

  The present invention has been made in view of the above problems, and can detect and adjust the voltage of each single cell in a battery with a simple structure, and can easily detect a voltage detection terminal and a voltage extraction board (connector). It is an object of the present invention to provide a stacked battery that can be connected to each other, a method for manufacturing the same, and a method for attaching a voltage extraction board.

In order to solve the above problems, the present invention has the following configuration. That is,
A first aspect of the present invention includes a laminate in which a plurality of unit cell elements from which a voltage detection tab protrudes are laminated, an exterior body in which the laminate is inserted, and a voltage extraction board connected to the voltage detection tab. The voltage detection tabs protrude from the unit cell element to the outside of the outer package so that the voltage detection tabs do not overlap each other when viewed in the stacking direction of the stacked body, and the voltage extraction board includes an upper voltage extraction board and a lower voltage extraction board. In addition to being combined, the wiring of the voltage extraction board is positioned corresponding to the protruding position of the voltage detection tab, and the upper voltage extraction board and the lower voltage extraction board sandwich the voltage detection tab together with the exterior body. A stacked battery in which the voltage detection tab and the voltage extraction board are pressure-bonded while being configured.

  In the first invention and the invention shown below, the “single cell element” includes at least a voltage detection tab and a current collector, and optionally has a positive electrode layer and a negative electrode layer on one or both surfaces of the current collector. Alternatively, the solid electrolyte layer is provided. For example, when a plurality of single battery elements are stacked, a single battery element having a plurality of bipolar electrodes can be used. In addition, “the voltage detection tabs do not overlap in the stacking direction view of the stacked body” means that, for example, when the cell elements are stacked in the vertical direction to form a stacked body, each voltage detection tab in the top view or the bottom view A form in which the protruding directions of do not overlap each other. Further, “the voltage detection tab and the voltage extraction board are pressure-bonded” means that the voltage detection tab and the voltage extraction board are fixed by being pressed against each other.

  In the first aspect of the present invention, the laminate is a current collector, a positive electrode layer and a negative electrode layer provided on the front and back of the current collector, and a solid provided on the opposite side of the positive electrode layer or the negative electrode current collector It is preferable that a single battery element provided with an electrolyte layer is laminated, and a part of the current collector is a voltage detection tab. By using a stacked battery in which bipolar electrodes and solid electrolyte layers are alternately stacked, a stacked battery with high output density and energy density can be obtained, and the voltage detection tab can be a part of the current collector. This is because there is no need to prepare a separate member, and a stacked battery that can be manufactured more efficiently can be obtained.

  In the first aspect of the present invention, it is preferable that a plurality of voltage detection tabs protrude from the stacked body so as to be parallel to a direction substantially orthogonal to the stacking direction on at least one side surface in the stacking direction of the stacked body. This is because it is easier to crimp the voltage detection tabs simultaneously when attaching the voltage extraction board.

  In the first aspect of the present invention and the present invention described below, “at least one side surface in the stacking direction of the laminate” means at least one of the side surfaces along the stacking direction of the stack, for example, in the vertical direction When a substantially rectangular unit cell element is laminated to form a laminate, it means at least one side surface among the side surfaces orthogonal to the horizontal direction of the laminate formed by four rectangular sides of the unit cell element. In addition, “a plurality of voltage detection tabs projecting from the stacked body so that the voltage detection tabs are arranged in parallel in a direction substantially perpendicular to the stacking direction on at least one side surface in the stacking direction of the stacked body” means, for example, a single unit having a substantially rectangular shape in the vertical direction. When the battery elements are stacked to form a stacked body, it means a state in which the voltage detection tab protrudes side by side in a substantially horizontal direction on the side surface along the stacking direction of the stacked body.

The second aspect of the present invention is a unit cell element manufacturing process for manufacturing a unit cell element in which the voltage detection tab protrudes, and stacking the manufactured unit cell element so that the voltage detection tab does not overlap in the stacking direction, Lamination process, laminating process , inserting the laminated body into the exterior body, projecting the voltage detection tab out of the exterior body, and upper side where the wiring is pre-positioned corresponding to the projecting position of the voltage detection tab A voltage extraction board mounting step in which the voltage extraction board and the lower voltage extraction board are crimped to the voltage detection tab while the voltage detection tab is sandwiched and fixed together with the outer body between the upper voltage extraction board and the lower voltage extraction board. A method for manufacturing a stacked battery.

  In the second aspect of the present invention, the laminate is a current collector, a positive electrode layer and a negative electrode layer provided on the front and back of the current collector, and a solid provided on the opposite side of the positive electrode layer or the negative electrode current collector It is preferable that a single battery element provided with an electrolyte layer is laminated, and a voltage detection tab is produced by cutting out a current collector. By manufacturing a stacked battery by alternately laminating bipolar electrodes and solid electrolyte layers, it is possible to obtain a stacked battery with high output density and energy density, and a voltage detection tab by cutting out the current collector. This is because the voltage detection tab can be made a part of the current collector, and it is not necessary to prepare a separate member, and a stacked battery can be manufactured more efficiently.

  In the second aspect of the present invention, it is preferable that the unit cell elements are stacked such that a plurality of voltage detection tabs protrude in parallel in a direction substantially orthogonal to the stacking direction on at least one side surface in the stacking direction of the stack. . This is because it is easier to crimp the voltage detection tabs simultaneously when attaching the voltage extraction board.

According to a third aspect of the present invention, a single battery element from which a voltage detection tab protrudes is laminated so that the voltage detection tabs do not overlap in the stacking direction, and the laminate is inserted into the exterior body and the exterior A voltage detection tab is protruded from the body, and an upper voltage extraction board and a lower voltage extraction board in which wiring is pre-positioned corresponding to the protruding position of the voltage detection tab, the upper voltage extraction board and the lower voltage extraction board The voltage extraction board is attached by pressure bonding to the voltage detection tab while sandwiching and fixing the voltage detection tab together with the exterior body .

  In the third aspect of the present invention, the laminate is a current collector, a positive electrode layer and a negative electrode layer provided on the front and back of the current collector, and a solid provided on the opposite side of the positive electrode layer or the negative electrode current collector It is preferable that the unit cell element including the electrolyte layer is laminated, and the voltage detection tab is formed by cutting out the current collector. By targeting a stacked battery in which bipolar electrodes and solid electrolyte layers are alternately stacked, a stacked battery with high output density and energy density can be obtained, and a current detection notch can be used as a voltage detection tab. This is because the voltage detection tab can be a part of the current collector, there is no need to prepare a separate member, the structure is simple, and the voltage extraction board can be attached more easily and firmly. .

  In the third aspect of the present invention, it is preferable that the unit cell elements are stacked such that a plurality of voltage detection tabs protrude in parallel in a direction substantially orthogonal to the stacking direction on at least one side surface in the stacking direction of the stack. This is because it is easier to crimp the voltage detection tabs simultaneously when attaching the voltage extraction board.

According to the first aspect of the present invention, the voltage detection tab protrudes from the unit cell so that the voltage detection tab does not overlap in the stacking direction of the stacked body, and the voltage detection tab and the voltage extraction board in which the wiring position is preliminarily positioned are provided. Since it is in a crimped form, the voltage of each single cell in the battery can be detected and the capacity can be adjusted with a simple structure, and the connection between the voltage detection tab and the voltage extraction board can be facilitated.

  According to the second aspect of the invention, after the unit cell element manufacturing step, the manufactured unit cell elements are stacked so that the voltage detection tabs do not overlap when viewed in the stacking direction, and then the voltage is taken out in which the wiring positions are pre-positioned. Since the laminated battery is manufactured by crimping the substrate to the voltage detection tab, a plurality of voltage detection tabs and the voltage extraction substrate can be connected at the same time, which is excellent in productivity and has a simple structure for each unit in the battery. A stacked battery capable of detecting and adjusting the capacity of the battery voltage can be efficiently manufactured.

  According to the third aspect of the present invention, the voltage detection tab and the voltage extraction board can be connected more easily than in the prior art.

It is the schematic for demonstrating the laminated battery which concerns on embodiment. It is a flowchart for demonstrating an example of the manufacturing method of a laminated type battery. It is the schematic for demonstrating from preparation of a cell element to preparation of a voltage detection tab. It is the schematic for demonstrating preparation of a laminated body. It is the schematic for demonstrating the laminated body which concerns on a modification. It is the schematic for demonstrating the lamination insertion of a laminated body, and the connection of a voltage detection tab and a voltage extraction board | substrate. It is the schematic for demonstrating the unit for an external terminal connection provided in the voltage extraction board | substrate. It is the schematic for demonstrating the connection form of a voltage extraction board | substrate and the unit for external terminal connection. It is the schematic for demonstrating the connection form of a voltage extraction board | substrate and the unit for external terminal connection. It is the schematic for demonstrating engagement of a voltage extraction board | substrate. It is the schematic for demonstrating the laminated battery which concerns on a modification.

  Hereinafter, the present invention will be described in detail by exemplifying a stacked lithium secondary battery in which bipolar electrodes and solid electrolyte layers are alternately stacked. However, the present invention is not limited to the embodiment and can be applied to various stacked batteries.

  FIG. 1 is a diagram schematically showing a stacked battery 100 according to the first embodiment. FIG. 1A is a schematic view showing a configuration of a stacked battery 100 as viewed from the side, and FIG. 1B is a direction indicated by an arrow IB in FIG. 1A (that is, a stacking direction). It is the schematic which shows the form of the laminated battery 100 at the time of seeing from. In FIG. 1B, the internal members of the stacked battery 100 are indicated by dotted lines for the sake of explanation.

  As shown in FIG. 1, the stacked battery 100 includes a battery unit 10 including a stacked body 8 that is a power generation unit and an exterior body 9. The laminated body 8 is provided with a positive electrode lead 6 and a negative electrode lead 7 so that electric energy can be taken out from the battery unit 10. Further, voltage detection tabs 1 a, 1 a,... Protrude from the end of the laminated body 8, and voltage extraction boards 20, 30 are connected thereto. The voltage extraction boards 20 and 30 are pressure-bonded to the voltage detection tabs 1a, 1a,. Also, the voltage extraction boards 20 and 30 are provided with external terminal connection units 25 and 35, respectively. By connecting this to a voltage detection circuit (not shown), the voltage of each unit cell can be detected and Adjustable.

  Hereinafter, each configuration of the multilayer battery 100 will be described in detail while explaining a method for manufacturing the multilayer battery 100.

  FIG. 2 is a flowchart showing a manufacturing method S100 of the stacked battery 100 (hereinafter simply referred to as “manufacturing method S100”). As shown in FIG. 2, the manufacturing method S100 includes a step of providing a positive electrode layer on one side of the current collector (step S1), and a step of providing a negative electrode layer on the opposite side of the current collector from the positive electrode layer (step S2). A step of pressing each layer (step S3), a step of providing a solid electrolyte layer on the positive electrode layer or the negative electrode layer (step S4), a step of further pressing (step S5), and a voltage obtained by cutting out a part of the current collector. A step (step S6) for producing the detection tab 1a is provided. By the steps S1 to S6, the single cell element 5 (see FIG. 3) is manufactured, and by repeating the steps S1 to S6, the single cell elements 5, 5,. In the manufacturing method S100, thereafter, a plurality of unit cell elements 5, 5,... Are stacked to form a stacked body 8 (step S7), and a positive electrode lead 6 and a negative electrode lead 7 are welded to the stacked body 8 (process). S8), through the step of laminating and inserting the laminate 8 into the exterior body 9 (step S9), through the step of pressure bonding the voltage extraction boards 20 and 30 to the voltage detection tabs 1a, 1a, ... of the laminate 8 (step S10), The stacked battery 100 is manufactured. Hereafter, each process which concerns on manufacturing method S100 is demonstrated in detail, referring FIG. 2 and other drawings suitably.

(Process S1)
Step S1 is a step in which a positive electrode paste is applied to the current collector and dried, and a positive electrode layer is provided on one surface of the current collector. The current collector is not particularly limited as long as it is a current collector used for a bipolar electrode. For example, a metal foil or the like can be used. Specifically, a metal foil such as stainless steel, Cu, Ni, V, Au, Pt, Al, Mg, Fe, Ti, Co, Zn, or a film or glass such as polyamide, polyimide, PET, PPS, or polypropylene. In addition, a material obtained by evaporating a metal such as Cu, Ni, V, Al, Pt, or Au on a silicon plate or the like can be used. The thickness and size of the current collector are not particularly limited.

The positive electrode paste and the negative electrode paste described later contain an active material, a conductive aid, a binder, and the like. When the stacked battery 100 is a lithium secondary battery, the active materials include LiCoO ₂ , LiNiO ₂ , Li _{1 + x} Ni _1/3 Mn _1/3 Co _1/3 O ₂ , LiMn ₂ O ₄ , Li _{1 + x} Mn _{2 -x-y M y O 4 (} M is Al, Mg, Co, Fe, Ni, one or more selected from Zn) different element substituted Li-Mn spinel represented _{by, Li x TiO y, LiMPO 4} (M is Fe, Mn, Co, or Ni), V ₂ O ₅ , MoO ₃ , TiS ₂ , graphite, carbon materials such as hard carbon, LiCoN, Li _x Si _y O _z , lithium metal or lithium alloy (LiM, M is Sn, Si, Al, Ge, Sb, or the like P), lithium storage intermetallic compound _(Mg x M, M is Sn, Ge, either Sb, or, _{N y} b, N is an In, Cu, any of Mn) and can be used these derivatives. Here, there is no clear distinction between the positive electrode active material and the negative electrode active material, and the charge / discharge potentials of two kinds of compounds are compared with each other and a positive potential is used as a positive electrode, and a negative potential is used as a negative electrode. Thus, a lithium secondary battery having an arbitrary voltage can be configured. As the conductive auxiliary agent, conventional ones can be used without any particular limitation. For example, a carbon material such as acetylene black is preferably used. As the binder, a conventional binder can be used without any particular limitation. For example, it is preferable to use a fluorine resin such as polyvinylidene fluoride or a rubber-like resin such as styrene butadiene rubber.

  A positive electrode layer can be provided on one surface of the current collector by applying and drying the positive electrode paste as described above on the current collector. The means for applying the positive electrode paste is not particularly limited, and for example, it can be applied using a doctor blade. In step S1, the positive electrode layer is not formed on the entire surface of the current collector, but the positive electrode layer is formed at a substantially central portion of the current collector, and the current collector is otherwise exposed. . The thickness of the positive electrode layer is not particularly limited.

(Process S2)
Step S2 is a step of providing a negative electrode layer by applying and drying a negative electrode paste on the side surface opposite to the positive electrode layer of the current collector. The negative electrode paste contains the above active material, conductive additive, binder and the like. The means for applying the negative electrode paste is not particularly limited, and can be applied using, for example, a doctor blade. The negative electrode paste is applied and dried at a position corresponding to the positive electrode layer on the back side of the current collector. The thickness of the negative electrode layer is not particularly limited.

(Process S3)
Step S3 is a step of pressing and crimping each layer provided on the current collector. The pressing condition is not particularly limited as long as each layer is appropriately pressure-bonded on the current collector. By the step S3, the current collector and each layer are more firmly bound. Note that step S3 is not always necessary.

(Process S4)
Step S4 is a step of providing a solid electrolyte layer by applying and drying a solid electrolyte paste on the positive electrode layer or the negative electrode layer. The solid electrolyte paste contains a solid electrolyte and a binder. When the stacked battery 100 is a lithium secondary battery, examples of the solid electrolyte include Li ₂ O—B ₂ O ₃ —P ₂ O ₅ , Li ₂ O—SiO ₂ , Li ₂ O—B ₂ O ₃ —ZnO, and the like. oxide-based amorphous solid _{electrolyte, Li 2 S-SiS 2,} LiI-Li 2 S-SiS 2, LiI-Li 2 S-P 2 S 5, LiI-Li 2 S-B 2 S 3, Li 3 _{PO 4 -Li 2 S-Si 2} S, Li 3 PO 4 -Li 2 S-SiS 2, LiPO 4 -Li 2 S-SiS, LiI-Li 2 S-P 2 O 5, LiI-Li 3 PO 4 - _{P 2 S 5, Li 2 S} -P 2 S sulfide such as ₅ amorphous solid electrolyte, _{or, LiI-LiI-Al 2 O} 3, Li 3 N, and Li 3 N-LiI-LiOH and the like, Li _1.3 Al _0.3 Ti _0.7 (PO ₄ ) ₃ , Li _{1 + x + y} A _x Ti _2-x Si _y P _3-y O ₁₂ (A is Al or Ga, 0 ≦ x ≦ 0.4, 0 <y ≦ 0.6), [(B _1/2 Li _{1 / 2} ) _1-z C _z ] TiO ₃ (B is any of La, Pr, Nd, Sm, C is Sr or Ba, 0 ≦ z ≦ 0.5), Li ₅ La ₃ Ta ₂ O ₁₂ , Li ₇ La ₃ Zr ₂ O ₁₂ , Li ₆ BaLa ₂ Ta ₂ O ₁₂ , Li ₃ PO _{(4-3 / 2w)} N _w (w <1), Li _3.6 Si _0.6 P _0.4 O _4, etc. Crystalline oxide / oxynitride can be used. As the binder, the same ones as described above can be used.

  The solid electrolyte layer can be provided by applying and drying the solid electrolyte paste as described above on the positive electrode layer or the negative electrode layer. The means for applying the solid electrolyte paste is not particularly limited, and for example, it can be applied using a doctor blade. In step S4, a solid electrolyte layer is provided so as to cover the positive electrode layer or the negative electrode layer. That is, the coating area of the solid electrolyte layer is made larger than the coating area of the positive electrode layer or the negative electrode layer so that the positive electrode layer and a negative electrode layer described later are not in contact with each other when the batteries are stacked. The thickness of the solid electrolyte layer is not particularly limited.

(Process S5)
Step S5 is a step of further pressing and crimping the current collector provided with the positive electrode layer, the negative electrode layer, and the solid electrolyte layer. The pressing condition is not particularly limited as long as each layer is appropriately pressure-bonded on the current collector. By the step S5, the current collector and each layer are more firmly bound.

  Through the steps S1 to S5, for example, a bipolar electrode having the solid electrolyte layer 3 on one surface as shown in FIGS. 3A and 3B is manufactured. 3A is a diagram schematically showing a cross section of the bipolar electrode, and FIG. 3B is a schematic diagram when viewed from the direction indicated by the arrow IIIB in FIG. 3A. As shown in FIG. 3, the bipolar electrode includes a current collector 1, and a positive electrode layer 2 and a negative electrode layer 4 provided on the front and back of the current collector. On the opposite side, a solid electrolyte layer 3 is provided.

  In addition, about the lamination position of each layer, it is not limited to the said form. A configuration in which a positive electrode layer 2 is provided on one side of the current collector 1, a solid electrolyte layer 3 is provided on the positive electrode layer 2, and a negative electrode layer 4 is provided on the solid electrolyte layer 3. Alternatively, the positive electrode layer 2 may be provided on one surface side, the negative electrode layer 4 may be provided on the other surface side, and the solid electrolyte layer 3 may be provided on the negative electrode layer 4. Further, the positive electrode layer 2 and the negative electrode layer 4 may be provided on separate current collectors 1 and 1.

(Step S6)
Step S6 is a step of manufacturing the voltage detection tab 1a. The method for producing the voltage detection tab 1a is not particularly limited. For example, as shown in FIGS. 3A and 3B, the current collector 1 has a surplus portion outside the other layers 2, 3, and 4, and therefore a part of the surplus portion. The voltage detection tab 1a as shown in FIG. 3C can be manufactured by cutting out. Thereby, the voltage detection tab 1a can be produced without preparing a separate member. In FIG. 3C, two voltage detection tabs 1a are produced for each single cell element. However, the number of voltage detection tabs 1a is not limited to this, and may be one or three or more. It may be. The size of the voltage detection tab 1a is not particularly limited as long as the voltage of the single cell can be detected appropriately and can be appropriately crimped to a voltage extraction board described later. By the step S6, the cell element 5 can be manufactured.

  Multiple unit cell elements 5 are produced by repeating steps S1 to S6. As shown in FIG. 1B, the voltage detection tabs 1a, 1a,... Of the individual cell elements 5, 5,... Are not overlapped with each other when viewed from the stacking direction. It protrudes. In other words, the voltage detection tabs 1a, 1a of the single cell element 5 are manufactured in consideration of the protruding positions of the voltage detection tabs 1a, 1a,.

(Step S7)
Step S7 is a step of laminating unit cell elements 5, 5,. However, in step S7, as shown in FIG. 4A, both ends in the stacking direction are provided with the current collector 1 (single unit) in which the negative electrode layer 4 is not provided and only the positive electrode layer 2 and the solid electrolyte layer 3 are provided on one side. The battery element 5a), and the positive electrode layer 2 and the solid electrolyte layer 3 are not provided, and the current collector 1 (single battery element 5b) is provided with only the negative electrode layer 4 on one side. These single battery elements 5a and 5b A plurality of unit cell elements 5, 5,. At this time, as described above, the plurality of unit cell elements 5a, 5, 5,..., And 5b are stacked so that the voltage detection tabs 1a, 1a,. For example, as shown in FIG. 1B, in the state of the laminated body 8, each single unit is provided such that a predetermined gap is provided between the voltage detection tabs 1a, 1a,. Laminate battery elements. As the stacking means, the same stacking means as that of the conventional stacked battery can be used. At the time of stacking, it is preferable to use an alignment jig for alignment of each single cell element. In FIG. 4A, five unit cell elements 5a, 5, 5, 5, and 5b are stacked, but the number of unit cell elements is not limited to this.

(Step S8)
Step S8 is a step of welding the positive electrode lead 6 and the negative electrode lead 7 to the stacked unit cell elements 5a and 5b, respectively. As the positive electrode lead 6 and the negative electrode lead 7, those used for the stacked battery can be used without any particular limitation. Through step S8, the laminate 8 as shown in FIGS. 4B and 4C is manufactured. 4B is a schematic view of the stacked body 8 as viewed in the stacking direction, and FIG. 4C is a schematic view when the stacked body 8 is viewed from the direction indicated by IVC in FIG. 4B. It is. As shown in FIGS. 4B and 4C, the positive electrode lead 6 and the negative electrode lead 7 are welded to a side different from the side from which the voltage detection tabs 1a, 1a,.

  The form of the laminated body 8 is not limited to the said form. For example, it is good also as the laminated bodies 8a-8c as shown to FIG. 5 (A)-(C). That is, as shown in FIG. 5A, the voltage detection tabs 1a, 1a,... Are taken out from only one side of the stacked body 8a so as not to overlap each other in the stacking direction, and the voltage of the stacked body 8a The positive electrode lead 6 and the negative electrode lead 7 may be welded so as to face each other on a side different from the side where the detection tabs 1a, 1a,... Are provided, or as shown in FIG. The voltage detection tabs 1a, 1a,... Are taken out from only one side of the stacked body 8b in the stacking direction view, and the sides on which the voltage detection tabs 1a, 1a,. The positive electrode lead 6 and the negative electrode lead 7 may be welded so as to be arranged in parallel on one side different from that shown in FIG. 5C. As shown in FIG. Voltage so that they do not overlap each other The output tabs 1a, 1a,... Are taken out, and the positive electrode lead 6 and the negative electrode lead 7 are welded so as to face each other on a side different from the side where the voltage detection tabs 1a, 1a,. Form may be sufficient.

(Process S9)
In step S9, as shown in FIG. 6A, the laminate 8 is packaged so that the positive electrode lead 6, the negative electrode lead 7, and the voltage detection tabs 1a, 1a,. In this process, the battery unit 10 is formed by laminating the body 9. Although the material of the exterior body 9 is not particularly limited, aluminum is interposed between the plurality of resin layers from the viewpoint of easy lamination insertion and being able to be firmly sandwiched between the voltage extraction substrates 20 and 30 described later. It is preferable to use an aluminum laminate film with a layer interposed. For example, a film composed of three layers of a protective layer made of nylon / an aluminum layer / a heat fusion layer made of PP can be applied. About the protrusion length from the exterior body 9 of the positive electrode lead 6, the negative electrode lead 7, and the voltage detection tabs 1a, 1a,..., Electric energy can be appropriately taken out from the battery unit 10, and There is no particular limitation as long as the voltage of the unit cell can be detected and adjusted.

(Step S10)
Step S <b> 10 is a step in which the voltage extraction boards 20, 30 are pressure-bonded and attached to the voltage detection tabs 1 a, 1 a,. Hereinafter, the attachment / wiring form of the voltage extraction board 20 to the voltage detection tabs 1a, 1a,... Will be described. The voltage extraction board 30 can be the same as the voltage extraction board 20.

  For example, as shown in FIGS. 1A and 6B, the voltage extraction board 20 is arranged such that the wiring is pre-positioned at the protruding position of the voltage detection tabs 1a, 1a,. Board 20a) and a lower voltage take-out board 20b corresponding to the board 20a), the voltage detection tabs 1a, 1a,... The take-out substrate 20 can be appropriately attached to the voltage detection tabs 1a, 1a,. Alternatively, as shown in FIG. 6C, using one voltage extraction substrate 20 having a substrate upper portion 20a ′ and a substrate lower portion 20b ′, the substrate upper portion 20a ′ and the substrate lower portion 20b ′. Are inserted between the voltage detection tabs 1a, 1a,... And are positioned in advance at the protruding positions of the voltage detection tabs 1a, 1a,. .. And the voltage detection tabs 1a, 1a,... Can also be appropriately attached to the voltage detection tabs 1a, 1a,. As described above, the voltage extraction board 20 can be easily attached to the voltage detection tabs 1a, 1a,... By pressing the voltage detection tabs 1a, 1a,. . Further, as described above, since the protruding positions of the voltage detection tabs 1a, 1a,... Are not overlapped with each other when viewed in the stacking direction of the stacked body 8, the wiring (or terminal 21) of the voltage extracting board 20 is used. , 21,... Are positioned in advance at the projecting positions of the voltage detection tabs 1a, 1a,..., So that the voltage extraction boards 20 are sandwiched between the voltage detection boards 20 at the same time. .. And the voltage detection tabs 1a, 1a,... Can be appropriately connected, and the laminated battery 100 can be manufactured more easily. When the voltage detection tabs 1a, 1a,... Are sandwiched between the voltage extraction boards 20, the exterior body 9 of the battery unit 10 may be sandwiched. If it does in this way, the voltage extraction board | substrate 20 can be attached to the voltage detection tabs 1a, 1a, ... (battery part 10) more stably.

  As the voltage extraction board 20, a board having a wire harness provided on the insulator surface or inside the insulator can be used, and a printed board, a PP board, or the like can be used.

  On the other hand, as shown in FIGS. 7A and 7B, an external terminal connection unit 25 is incorporated in the voltage extraction board 20 so as to be connected to the wire harnesses 20e, 20e,. Hereinafter, a connection form between the voltage extraction board 20 and the external terminal connection unit 25 will be described.

  As shown in FIG. 7A, a recess is provided at the end of the voltage extraction board 20 opposite to the side where the battery part 10 is provided, and the external terminal connection unit 25 is provided in the recess. It is inserted. On the other hand, as shown in FIG. 7B, the external terminal connection unit 25 is provided with wirings 25b, 25b,..., And the wire harnesses 20e, 20e,. Connected. A method for connecting the wirings 25b, 25b,... And the wire harnesses 20e, 20e,... Is not particularly limited, but can be connected by, for example, soldering. Further, the wirings 25b, 25b,... Are connected to the external terminals 25a, 25a,..., Whereby the voltages of the single cells inside the stacked battery 100 can be detected and adjusted.

  The connection between the voltage extraction board 20 and the external terminal connection unit is not limited to the above embodiment. 8A to 8C show a connection form of the voltage extraction board 20 and the external terminal connection unit 125 according to the modification. As shown in FIG. 8A, an insertion portion having a substantially U-shaped cross section is formed on one side surface of the external terminal connecting unit 125, and the connection terminal 126 is formed inside the U-shaped insertion portion. , 126,... Are provided. And the voltage extraction board | substrate 20 is inserted and fixed to the insertion part so that it may be clamped by the connection terminals 126, 126, ... and the U-shaped insertion part. At this time, the wire harnesses 20e, 20e,... Of the voltage extraction board 20 are in contact with the connection terminals 126, 126,... And the voltage extraction board 20 and the external terminal connection unit 125 can be electrically connected. Yes.

  In this case, the shape of the end of the wire harness 20e on the external terminal connection unit 125 side is not particularly limited as long as it can be appropriately connected to the connection terminal 126. For example, FIG. It can be set as the end shape formed in the substantially rectangular shape as shown. On the other hand, for the connection terminal 126, for example, as shown in FIG. 8C, the connection terminal 126a having a concave end portion in which a concave portion is formed in a part of a substantially flat plate, or the end portion is formed in a spring shape. The connection terminal 126b or the connection terminal 126c having a convex end portion can be used.

  The connection form between the voltage extraction board 20 and the external terminal connection unit may be the form shown in FIG. 9 in addition to the above form. That is, the voltage extraction board 20 is composed of an upper voltage extraction board 20a and a lower voltage extraction board 20b, and external terminals are connected to the U-shaped recesses provided on the wire harness side board (upper voltage extraction board 20a in FIG. 9). The connection unit 175 can be fitted, and the voltage extraction board 20a and the external terminal connection unit 175 can be fixed and connected using a fixing member 150 such as a screw. In FIG. 9, when connecting the upper voltage extraction board 20a and the lower voltage extraction board 20b, a recess 20f is provided in a part of the lower voltage extraction board 20b so that the connection surface is substantially flush. A part of the fixing member 150 is prevented from interfering with the fixing of the substrates 20a and 20b.

  When the voltage extraction board 20 includes the upper voltage extraction board 20a and the lower voltage extraction board 20b, the two boards 20a and 20b need to be fixed to each other. The fixing method is not particularly limited. For example, as shown in FIG. 10 (A), a hook-like engaging portion and an engaged portion (FIG. 10 (A) are formed at the ends of the substrates 20a and 20b. ), The substrates 20a and 20b can be easily fixed so as to be hooked with each other. Moreover, when applying to a large sized power supply etc., it will be necessary to install several laminated batteries 100 depending on a use. In such a case, for example, as shown in FIG. 10B, the voltage extraction boards 20, 20,... Are the same by providing connection pins 20c and connected holes 20d at positions corresponding to each other on the boards 20a and 20b. Can be continuously fixed in the stacking direction, and a plurality of stacked batteries 100, 100,... Can be easily installed, and space can be saved.

  In the above description, the voltage extraction board 20 is attached to one side of the battery unit 10 and the voltage extraction board 30 is separately attached to the other side. However, the mounting form of the voltage extraction board is limited to this. It is not something. For example, as illustrated in FIG. 11, the voltage extraction board 250 is provided so as to cover the outer edge (all four sides) of the battery unit 10 using the voltage extraction board 250 including the positive electrode side bus bar 210 and the negative electrode side bus bar 220. You may attach to the voltage detection tab 1a, 1a, .... Thereby, the voltage extraction board 250 can be more firmly attached to the voltage detection tabs 1a, 1a,... (Battery unit 10), and the laminated battery 200 having excellent earthquake resistance and the like can be obtained.

  As described above, according to the stacked battery 100 or the stacked battery 200, the stacked body 8 in which a plurality of unit cell elements 5a, 5, 5,..., 5b having the voltage detection tabs 1a, 1a,. Are connected to 1a, 1a,... And voltage extraction boards 20 and 30 are arranged in advance, and the voltage detection tabs 1a, 1a,... Do not overlap each other when viewed in the stacking direction of the stacked body 8. As described above, the battery element 5a, 5, 5,..., 5b protrudes from each other, and the voltage detection tabs 1a, 1a,. The voltage of each single cell in the battery can be detected and the capacity can be adjusted by the structure, and the connection between the voltage detection tabs 1a, 1a,.

  In addition, according to the manufacturing method S100, the unit cell elements 5a, 5, 5,..., 5b from which the voltage detection tabs 1a, 1a,. 5b are stacked so that the voltage detection tabs 1a, 1a,... Do not overlap with each other when viewed in the stacking direction, and the stacked body 8 is manufactured. Since the take-out substrates 20 and 30 are pressure-bonded, the plurality of voltage detection tabs 1a, 1a,... And the voltage take-out substrates 20 and 30 can be connected at the same time. The stacked batteries 100 and 200 that can detect the voltage of the unit cell and adjust the capacity can be efficiently manufactured.

  Further, as described above, the cell elements from which the voltage detection tabs 1a, 1a,... Protrude are stacked so that the voltage detection tabs 1a, 1a,. It is possible to connect the voltage detection tabs 1a, 1a, ... and the voltage extraction boards 20, 30 more easily than in the past by pressing the voltage extraction boards 20, 30 to the detection tabs 1a, 1a, ....

  The laminated battery according to the present invention will be described in more detail by way of examples. A stacked battery was produced as follows.

(Preparation of positive electrode paste)
LiCoO _{2 is} used as the positive electrode active material, Li ₂ S—P ₂ S _{5 is} used as the solid electrolyte, acetylene black is used as the conductive auxiliary agent, and SBR is used as the binder, so that these are 45: 45: 7: 3 on a mass basis. Was dry mixed. Thereafter, wet kneading was performed using heptane as a solvent so that the solid content rate was 50%, and a positive electrode paste was prepared.

(Formation of positive electrode layer)
The positive electrode paste was applied onto a 70 mm × 120 mm, 15 μm thick SUS foil with a doctor blade. At the time of application, an uncoated part of 1 mm on the top and bottom and one side of the SUS foil and 60 mm on the other side was provided, and the application area was 50 mm × 50 mm. After application, the film was dried at 80 ° C. to form a positive electrode layer on the SUS foil.

(Preparation of solid electrolyte paste)
Using Li ₂ S—P ₂ S ₅ as a solid electrolyte and SBR as a binder, these were dry-mixed to be 95: 5 on a mass basis, and then heptane so that the solid content was 50%. Was used for wet kneading to prepare a solid electrolyte paste.

(Formation of solid electrolyte layer)
The solid electrolyte paste was applied onto the positive electrode layer with a doctor blade. The application area was set to 60 mm × 60 mm so as to protrude from the positive electrode layer by 5 mm vertically and horizontally. After application, the solid electrolyte layer was formed on the positive electrode layer by drying at 80 ° C.

(Pressing process)
The positive electrode layer and the solid electrolyte layer on the SUS foil were pressed together at 1 ton / cm ² . The film thickness after pressing was 60 μm for the positive electrode layer and 30 μm for the solid electrolyte layer.

(Preparation of negative electrode paste)
Li ₄ Ti ₅ O _{12 is} used as the negative electrode active material, Li ₂ S—P ₂ S _{5 is} used as the solid electrolyte, acetylene black is used as the conductive auxiliary agent, and SBR is used as the binder, and these are mass-based 45: 45: 7: 3 was dry mixed. Thereafter, wet kneading was performed using heptane so that the solid content rate was 50%, thereby preparing a negative electrode paste.

(Formation of negative electrode layer)
The negative electrode paste was applied to the opposite side of the SUS foil from the positive electrode layer and the solid electrolyte layer with a doctor blade. The negative electrode layer was provided at a position corresponding to the positive electrode layer of the SUS foil, and the coating area was 50 mm × 50 mm. After application, the film was dried at 80 ° C. to form a negative electrode layer on the SUS foil.

(Pressing process)
The negative electrode layer on the SUS foil was pressed at 1 ton / cm ² . The film thickness of the negative electrode layer after pressing was 70 μm.

(Production of voltage detection tab)
A plurality of bipolar electrodes prepared as described above were prepared, and the SUS foil was slit in a state where the voltage detection tab was left. At this time, when 5 layers of bipolar electrodes are stacked, the 10 mm wide tabs are spaced at intervals of 5 mm on one side (70 mm side) of the SUS foil so that the protruding positions of the voltage detection tabs do not overlap when viewed in the stacking direction. The structure is such that it protrudes.

(Lamination process)
Using a positioning jig for lamination, five bipolar electrodes were laminated to produce a laminated bipolar electrode. It should be noted that no electrode layer was provided on the outermost layer side. Four pairs of bipolar batteries were made with five bipolar electrodes. Further, as described above, the voltage detection tabs are protruded so as to be juxtaposed from the same side of the laminated bipolar electrode so that the protruding positions of the voltage detection tabs do not overlap each other when viewed in the lamination direction.

(Positive electrode lead and negative electrode lead welding)
A positive electrode lead and a negative electrode lead were attached to the outermost layer by welding to form a laminate. At this time, the positive electrode lead and the negative electrode lead were attached to the side of the laminated bipolar electrode different from the side from which the voltage detection tab protrudes.

(Laminate insertion)
The laminate produced as described above was laminated and inserted into the outer package. The voltage detection tab protruded outside the exterior body.

(Attaching the voltage extraction board)
The voltage detection tab and the voltage extraction substrate were wired by sandwiching the two voltage extraction substrates. At this time, a printed wiring board on which wiring was applied in advance was used as the voltage extraction board. Moreover, the voltage extraction board | substrate was made into the structure which pinches | interposes a part of exterior body.

(Built-in external terminal connection unit)
The external terminal connection unit was incorporated into the wiring take-out board, and the wiring was taken out to the external terminal. The connection portion of the external terminal connection unit has a structure in which a part of the wiring protrudes toward the voltage extraction board, and the wiring of the voltage extraction board and the wiring of the external terminal connection unit are connected by soldering.

  The laminated battery thus produced was able to appropriately detect and adjust the voltage for each of the internal cells. In addition, it is easy to connect the voltage detection tab and the voltage extraction board, and it is possible to manufacture a stacked battery more efficiently than in the past.

  Although the present invention has been described with reference to the most practical and preferred embodiments at the present time, the invention is not limited to the embodiments disclosed herein. However, the invention can be changed as appropriate without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a stacked battery and a method for manufacturing the same, and a method for attaching a voltage extraction board are also included. Moreover, it should be understood as being included in the technical scope of the present invention.

  The present invention can be suitably used as a power source for portable devices, electric vehicles, hybrid vehicles, and the like.

DESCRIPTION OF SYMBOLS 1 Current collector 1a Voltage detection tab 2 Positive electrode layer 3 Solid electrolyte layer 4 Negative electrode layer 5 Single battery element 6 Positive electrode lead 7 Negative electrode lead 8 Laminate body 9 Outer body 10 Battery part 20 Voltage extraction board 25 External terminal connection unit 30 Voltage extraction Substrate 35 External terminal connection unit 100 Multilayer battery 200 Multilayer battery

Claims (9)

A laminated body in which a plurality of unit cell elements from which the voltage detection tab protrudes are laminated, an exterior body in which the laminated body is inserted, and a voltage extraction board connected to the voltage detection tab,
The voltage detection tabs protrude from the unit cell element to the outside of the exterior body so that they do not overlap each other when viewed in the stacking direction of the stack,
The voltage extraction board is a combination of an upper voltage extraction board and a lower voltage extraction board, and the wiring of the voltage extraction board is positioned corresponding to the protruding position of the voltage detection tab,
A stacked battery in which the upper voltage extraction board and the lower voltage extraction board are configured to sandwich the voltage detection tab together with the exterior body, and the voltage detection tab and the voltage extraction board are pressure-bonded. . The upper voltage extraction board is provided with a hook-shaped engagement part, and the lower voltage extraction board is provided with an engaged part,
The stacked battery according to claim 1 , wherein the upper voltage extraction board and the lower voltage extraction board are fixed to each other so as to be hooked to each other by the engagement portion and the engaged portion . The stacked battery according to claim 1, wherein the voltage extraction board is provided with a connection pin and a connection hole for connecting to another voltage extraction board . A cell element production process for producing a cell element with a protruding voltage detection tab,
Lamination process , laminating the produced single cell element so that the voltage detection tab does not overlap in the lamination direction view, a lamination process ,
Inserting the laminate into the exterior body and projecting the voltage detection tab out of the exterior body, and an upper voltage extraction board and a lower side in which wiring is pre-positioned corresponding to the projecting position of the voltage detection tab A voltage extraction board mounting step for crimping the voltage extraction board to the voltage detection tab while sandwiching and fixing the voltage detection tab together with the exterior body between the upper voltage extraction board and the lower voltage extraction board. The manufacturing method of a laminated type battery. The upper voltage extraction board is provided with a hook-shaped engagement part, and the lower voltage extraction board is provided with an engaged part,
5. The manufacturing method according to claim 4, wherein in the voltage extraction board mounting step, the upper voltage extraction board and the lower voltage extraction board are fixed to each other so as to hook the engaging portion and the engaged portion. . The manufacturing method according to claim 4 , wherein the voltage extraction board is provided with a connection pin and a connection hole for connecting to another voltage extraction board . The cell elements from which the voltage detection tab protrudes are stacked so that the voltage detection tabs do not overlap when viewed in the stacking direction to form a stacked body, and the stacked body is inserted into the exterior body and the voltage detection tab is removed from the exterior body. Project
The upper voltage take-out board and the lower voltage take-out board in which wiring is pre-positioned corresponding to the protruding position of the voltage detection tab, the voltage with the outer package together with the upper voltage take-out board and the lower voltage take-out board. A method for attaching a voltage extraction board , wherein the detection tab is sandwiched and fixed, and is crimped to the voltage detection tab. The upper voltage extraction board is provided with a hook-shaped engagement part, and the lower voltage extraction board is provided with an engaged part,
The upper voltage extraction board and the lower voltage extraction board are fixed to each other so that the engagement portion and the engaged portion are hooked while sandwiching the voltage detection tab together with the exterior body. The method described. The method according to claim 7 or 8, wherein the voltage extraction board is provided with a connection pin and a connected hole for connecting to another voltage extraction board .

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