JP2011100693A - Current collector and laminated battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode body and a laminated battery wherein positioning during lamination can be carried out easily. <P>SOLUTION: A current collector has a power generation portion arranged on at least one face. On one face side of the current collector, a spacer is arranged at least at a portion of the outer periphery of a position where the power generation part is arranged, and on the other face side of the current collector, a recess is formed at a position corresponding to a position where the spacer is arranged. The laminated battery is formed by laminating a plurality of the current collectors together with the power generation parts, and by fitting the spacers into the recesses. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a current collector and a stacked battery.

  A laminated battery formed by laminating a plurality of power generation elements (power generation units and current collectors) has an advantage that it can be easily reduced in thickness and weight. In particular, by laminating a bipolar electrode body provided with a positive electrode layer and a negative electrode layer on the front and back of the current collector, it is possible to improve the output density and energy density, and to make a stacked battery excellent in heat dissipation. it can. In addition, when a solid electrolyte is used as the electrolyte of the laminated battery, there is no leakage of liquid from the battery and generation of by-product gas, so that the battery can be configured with a simple structure and excellent reliability.

  On the other hand, when a laminated battery is formed by laminating a plurality of electrode bodies, it is necessary to take some measures to prevent a short circuit due to unnecessary contact between the electrode bodies. For example, as described in Patent Documents 1 and 2, by providing a spacer between the current collector and the current collector, unnecessary contact between the electrode bodies can be avoided and a short circuit can be prevented. Conceivable.

JP 2004-253168 A JP 2008-130450 A

  However, in the stacked batteries disclosed in Patent Documents 1 and 2, short-circuiting between adjacent current collectors can be prevented by providing a spacer, but positioning when stacking electrode bodies is difficult. Therefore, there is a possibility that the electrode bodies are laminated in a state where the electrode bodies are unnecessarily in contact with each other due to the electrode bodies being displaced and laminated, and there is also a possibility of a short circuit or the like. Further, when the electrode bodies are shifted and laminated, the positions of the positive electrode and the negative electrode may be shifted. In such a case, there is a possibility that sufficient battery performance may not be obtained. Furthermore, when the electrode body is laminated, press contact (particularly constrained press treatment after lamination) may cause the contact surface of the electrode body to shift, and pressure may not be applied uniformly.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the electrical power collector and laminated | stacked battery which can perform positioning easily, when laminating | stacking an electrode body.

In order to solve the above problems, the present invention has the following configuration. That is,
A first aspect of the present invention is a current collector in which a power generation unit is disposed on at least one surface, and a spacer is disposed on at least a part of the outer periphery of the position where the power generation unit is disposed on one surface side of the current collector. The current collector has a recess formed in a position corresponding to the position where the spacer is disposed on the other surface side of the current collector.

  In the first invention and the invention shown below, the “spacer” is provided on a part of one surface of the current collector so as to be interposed between the current collectors when the current collector and the power generation unit are stacked. Insulated member. The “recessed portion” refers to a recessed portion that is large enough to fit a spacer.

  A second aspect of the present invention is a multilayer battery in which a plurality of current collectors according to the first aspect of the present invention are stacked together with a power generation unit, and a spacer is fitted in a recess.

  According to a third aspect of the present invention, a power generation unit is provided between the first current collector and the second current collector, a spacer is provided on at least a part of the outer periphery of the power generation unit, and the first current collector or the second current collector is provided. It is a laminated battery in which a recess is provided on a surface on the power generation unit side of at least one of the current collectors, and a spacer is fitted in the recess.

  In the third aspect of the present invention, “first current collector” and “second current collector” mean one current collector and another current collector that are adjacent to each other via a power generation unit. The material and size may be the same.

  The stacked batteries according to the second and third aspects of the present invention comprise a pressing step of applying a pressure σ in the stacking direction after stacking a plurality of current collectors and power generation units according to the first aspect of the present invention. (Which refers to a constrained pressing process after lamination), a pressure σ in the pressing process, a Young's modulus E1 of the first electrode layer (which refers to either the positive electrode layer or the negative electrode layer of the power generation unit), and the Young of the electrolyte layer. From the rate E2 and the Young's modulus E3 of the second electrode layer (which is either the negative electrode layer or the positive electrode layer of the power generation unit), the total stacking direction thickness x1 of the first electrode layer and the electrolyte layer, the current collection of the spacer A stacked battery in which a stacking direction height x2 from one surface of the body, a recess stacking depth x3, and a stacking direction thickness x4 of the second electrode layer formed on the other surface of the current collector are calculated. It is preferable to manufacture by this manufacturing method.

In the manufacturing method, x1 to x4 preferably satisfy the following formula (1).
x2-x3 <x1 + x4 (1)

Moreover, in the said manufacturing method, pressure (sigma), x1-x4, the Young's modulus E1 of a 1st electrode layer, the Young's modulus E2 of an electrolyte layer, and the Young's modulus E3 of a 2nd electrode layer are following formula (2)-(6 ) Is preferably satisfied. This is because the pressure can be applied more appropriately after stacking a plurality of current collectors and power generation units.
x2> x1 (2)
x3> x4 (3)
σ = E · Δx (4)
E = E1, E2, E3 / (E1, E2 + E2, E3 + E3, E1) (5)
Δx = (x1 + x3−x2) / (x1 + x4) (6)

  According to the first aspect of the present invention, there is provided a current collector in which a spacer is provided on one surface side and a recess is provided in a portion on the back surface side with respect to the spacer. According to the current collector, when the laminated battery is laminated together with the power generation unit, the current collector and the power generation are obtained by fitting the spacer according to one current collector into the recess according to the other current collector. The stacking position of the part (hereinafter, these may be collectively referred to as an electrode body) can be easily positioned, and a plurality of electrode bodies can be stacked appropriately.

  According to the second aspect of the present invention, a plurality of current collectors according to the first aspect of the present invention are laminated together with a power generation unit, and a laminate in which spacers between the current collectors are fitted in recesses provided in the current collector. A type battery is provided. According to the multilayer battery, the spacer is fitted into the recess, so that the electrode body is appropriately positioned and laminated, and when the laminate is subjected to a pressing process after lamination, By the fitting, it is possible to prevent the positional deviation between the electrode bodies.

  According to the third aspect of the present invention, there is provided a stacked battery in which a spacer between current collectors is fitted in a recess provided in the current collector. According to the multilayer battery, the spacer is fitted into the recess, so that the electrode body is appropriately positioned and laminated, and when the laminate is subjected to a pressing process after lamination, By the fitting, it is possible to prevent the positional deviation between the electrode bodies.

It is the schematic for demonstrating the electrical power collector, electrode body, and laminated battery which concern on this invention. It is a figure for demonstrating the conditions for a pressure to be applied more appropriately in the press process after lamination | stacking. It is a figure for demonstrating about the preferable form at the time of storage of the electrical power collector which concerns on this invention, and an electrode body. It is a figure for demonstrating the laminated battery which concerns on a comparative example.

  Hereinafter, the present invention will be described in detail by exemplifying a laminated lithium secondary battery. However, the present invention is not limited to the embodiment and can be applied to various stacked batteries.

  FIG. 1 is a diagram schematically illustrating an electrode body 10 and a stacked battery 100 according to an embodiment. FIG. 1A is a schematic diagram illustrating a configuration of the electrode body 10, and FIG. 1B is a schematic diagram illustrating a configuration of a stacked battery 100 in which the electrode bodies 10 are stacked. In FIG. 1B, for the purpose of explanation, the positive and negative electrode leads and the outer package of the stacked battery 100 are omitted.

<Electrode body 10>
As shown in FIG. 1A, the electrode body 10 includes a positive electrode layer 11, a negative electrode layer 12, a current collector 14 provided between the positive electrode layer 11 and the negative electrode layer 12, and a negative electrode layer 12. A bipolar electrode including the electrolyte layer 13 provided is provided. Further, on the negative electrode layer 12 and electrolyte layer 13 side of the current collector 14, spacers 15 and 15 are provided on at least a part of the outer periphery of the negative electrode layer 12 and the electrolyte layer 13 (both ends in FIG. 1). On the positive electrode layer 11 side of the current collector 14, recesses 16, 16 are provided at positions that are at least part of the outer periphery of the positive electrode layer 11 and on the back surface side with respect to the spacers 15, 15. As described above, the electrode body 10 includes the current collector 14 provided with the spacers 15 and 15 and the recesses 16 and 16.

(Positive electrode layer 11, negative electrode layer 12)
The positive electrode layer 11 and the negative electrode layer 12 are layers including an active material and an electrolyte, and optionally including a conductive additive and a binder. When the stacked battery 100 is an all-solid 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−xy M _y O ₄ (M is any one of Al, Mg, Co, Fe, Ni, Zn) Substituted Li—Mn spinel, Li _x TiO _y , LiMPO ₄ (M Is any one of Fe, Mn, Co, 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 S , N represents can be used an In, Cu, or) or Mn, these derivatives. Here, there is no clear distinction between the positive electrode active material and the negative electrode active material, and the positive electrode layer 11 shows the noble potential by comparing the charge / discharge potentials of the two types of compounds, and the negative electrode shows the base potential. A lithium secondary battery having an arbitrary voltage can be formed using the layer 12. Further, when the stacked battery 100 is an all-solid lithium secondary battery, a solid electrolyte is used as the electrolyte. Specifically, an oxide-based amorphous solid electrolyte such as Li ₂ O—B ₂ O ₃ —P ₂ O ₅ , Li ₂ O—SiO ₂ , Li ₂ O—B ₂ O ₃ —ZnO, 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 5 Sulfide-based amorphous solid electrolyte such as LiI, LiI-Al ₂ O ₃ , Li ₃ N, Li ₃ N-LiI-LiOH, etc., 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 ₂ (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 La, Pr , Nd, or 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 , Crystalline oxides and oxynitrides such as Li ₃ PO _{(4-3 / 2w)} N _w (w <1) and Li _3.6 Si _0.6 P _0.4 O ₄ can be used. On the other hand, as the conductive auxiliary agent, a conventional one can be used without particular limitation, and for example, a carbon material such as acetylene black is preferably used. As the binder, conventional ones can be used without any particular limitation. For example, it is preferable to use a fluororesin such as polyvinylidene fluoride or a rubbery resin such as styrene butadiene rubber (SBR). The mixing ratio of each substance contained in the positive electrode layer 11 and the negative electrode layer 12 is not particularly limited as long as it is a ratio at which the stacked battery 100 can be appropriately operated. For example, the active material: electrolyte: conducting aid: binder = 45-50: 45-49: 0.1-0.5: 0.1-0.5 can be set at a mass ratio. In addition, the thickness and shape of the positive electrode layer 11 and the negative electrode layer 12 are not particularly limited as long as they are appropriately formed on the current collector 14 described later. For example, the thickness can be about 10 to 200 μm. However, as will be described later, the thickness of the positive electrode layer 11 and the negative electrode layer 12 is preferably a parameter for determining the stacking direction height of the spacers 15 and 15 and the stacking direction depth of the recesses 16 and 16. The positive electrode layer 11 and the negative electrode layer 12 can be formed by applying and drying a paste containing the above active material on the current collector 14 with a doctor blade or the like.

(Solid electrolyte layer 13)
The electrolyte layer 13 is a layer containing an electrolyte and optionally a binder. When the stacked battery 100 is an all-solid lithium secondary battery, the above-described solid electrolyte can be used as the electrolyte. The same binder as described above can be used. The mixing ratio of each substance included in the electrolyte layer 13 is not particularly limited as long as it is a ratio that allows the stacked battery 100 to operate appropriately. For example, it can be set as the mixing ratio of electrolyte: binder = 90-100: 10-0 by mass ratio. In addition, the electrolyte layer 13 is appropriately provided between the positive electrode layer 11 and the negative electrode layer 12, and may have a thickness, shape, or the like as long as it can contribute to ion conduction between the positive electrode layer 11 and the negative electrode layer 12. Is not particularly limited. For example, the thickness can be about 1 to 500 μm. However, as will be described later, the thickness of the electrolyte layer 13 is preferably a parameter for determining the stacking direction height of the spacers 15 and 15 and the stacking direction depth of the recesses 16 and 16. The electrolyte layer 13 can be formed by applying and drying a paste containing the electrolyte or the like on the negative electrode layer 12 with a doctor blade or the like. The electrolyte layer 13 may be formed by a spray method or an AD method.

(Current collector 14)
The material of the current collector 14 is not particularly limited as long as it is a current collector used for a bipolar electrode. For example, stainless steel, Cu, Ni, V, Au, Pt, Al, Mg, Fe, Ti, Co, Zn, Ge, In, Li, or other metal foil, or polyamide, polyimide, PET, PPS, polypropylene, etc. A film, glass, silicon plate or the like on which a metal such as Cu, Ni, V, Al, Pt, or Au is deposited can be used. The thickness and size of the current collector are not particularly limited. For example, the thickness can be about 10 to 30 μm. However, it is necessary to have a thickness that allows formation of recesses 16 and 16 to be described later. That is, the thickness of the current collector 14 is larger than the depth of the recesses 16 and 16 described later.

(Spacer 15)
The spacer 15 is provided on at least a part of the outer periphery of the negative electrode 12 and the electrolyte layer 13 on the side of the negative electrode layer 12 and the electrolyte layer 13 of the current collector 14, and is fitted into a recess 16 described later when the electrode body 10 is laminated. Together, it is a member that facilitates positioning of the electrode body 10 and is interposed between the current collectors 14, 14,... And contributes to insulation between the current collectors 14, 14. The material of the spacer 15 is not particularly limited as long as the spacer 15 is made of an insulator. However, from the viewpoint of ensuring the positioning of the electrode body 10, the spacer 15 has appropriate mechanical rigidity. For example, it is preferably made of polycarbonate. The shape of the spacer is not particularly limited as long as it is a shape that can be appropriately fitted to the concave portion 16 of the current collector 14 when the electrode body 10 is laminated, but the positive electrode layer 11 and the negative electrode layer 12 described above. In addition, the shape is preferably determined in consideration of the thickness and Young's modulus of the electrolyte layer 13, the pressure applied after the electrode body 10 is laminated, and the size and depth of the recess described later. As long as the spacer 15 is provided on at least a part of the outer periphery of the negative electrode layer 12 and the electrolyte layer 13, the installation form is not particularly limited, and a plurality of spacers 15 are scattered on the outer peripheral portion of the negative electrode layer 12 and the electrolyte layer 13. It may be a form such as, may be a substantially rod-like shape extending on both sides of the negative electrode layer 12 and the electrolyte layer 13, and continuously surround the outer periphery of the negative electrode layer 12 and the electrolyte layer 13. It may be a simple shape. In addition, when a particulate material is used for the above active material or electrolyte, the height in the stacking direction of the spacer 15 is set to the total of the negative electrode layer 12 and the electrolyte layer 13 from the viewpoint of suppressing slipping of the particulate material. It is preferable to make it higher than the thickness. The spacer 15 can be installed on the current collector 14 by welding (thermal welding), adhesion using an adhesive, or the like. In addition, a spacer may be fitted into a recess provided in the current collector 14 (a recess on the back side with respect to the recess 16).

(Recess 16)
The recess 16 is provided on at least a part of the outer periphery of the positive electrode layer 11 on the positive electrode layer 11 side of the current collector 14, and a spacer 15 is fitted therein so that the electrode body 10 is stacked when the electrode body 10 is laminated. 10 positioning is facilitated. The recess 16 is provided at a position on the back surface side with respect to the spacer 15, and the spacer 15 according to the other electrode body 10 is fitted into the recess 16 according to the one electrode body 10. The electrode bodies 10 and 10 can be stacked without shifting the stack position of the positive electrode layer 11 of the body 10 and the stack positions of the negative electrode layer 12 and the electrolyte layer 13 of the other electrode bodies 10. The shape of the recess 16 is not particularly limited as long as the spacer 15 can be fitted. According to the position of the spacer 15, the concave portions 16 are scattered on the back surface side with respect to the spacer 15 of the current collector 14, or a groove is formed on the back surface side with respect to the spacer 15 of the current collector 14. The recess 16 may be used. However, regarding the depth of the concave portion 16, the thickness and Young's modulus of the positive electrode layer 11, the negative electrode layer 12, and the electrolyte layer 13, the pressure applied after the electrode body 10 is stacked, and the height of the spacer 15 in the stacking direction. Is preferably determined in consideration of The recess 16 can be formed in the current collector 14 by a press process or the like.

  The electrode body 10 can be produced as follows, for example. That is, first, a current collector 14 is prepared, spacers 15 and 15 are provided on one surface of the current collector 14 by thermal welding or adhesion using an adhesive, and the other surface of the current collector 14 is provided. Concave portions 16 and 16 are provided in a portion on the back surface side with respect to the spacers 15 and 15 by press processing or the like. Then, a negative electrode paste containing the active material or the like is applied and dried inside the spacers 15 and 15 by a doctor blade or the like to form a negative electrode layer 13 having a predetermined thickness, and the electrolyte or the like is included on the negative electrode layer 13. The electrolyte paste is applied and dried by a doctor blade or the like to form the electrolyte layer 14 having a predetermined thickness. On the other hand, a positive electrode paste containing the above active material or the like is applied to the inside of the recesses 16 and 16 of the current collector 14 by a doctor blade or the like and dried to form the positive electrode layer 11 having a predetermined thickness. Thereby, the electrode body 10 can be produced. Alternatively, a negative electrode paste is applied and dried on one surface of the current collector 14 to provide a negative electrode layer 12 having a predetermined thickness, and a positive electrode paste is applied and dried on the other surface of the current collector 14 to obtain a positive electrode layer having a predetermined thickness. 11 and applying and drying an electrolyte paste on the negative electrode layer 12 to provide an electrolyte layer 13 having a predetermined thickness. Thereafter, the current collector 14 is formed on at least part of the outer periphery of the negative electrode layer 12 and the electrolyte layer 13. The electrode body 10 can also be formed by providing the spacers 15 and 15 and providing the recesses 16 and 16 in at least a part of the outer periphery of the positive electrode layer 11 and on the current collector 14 portion on the back side with respect to the spacers 15 and 15. Can be produced.

<Laminated battery 100>
By stacking the electrode bodies 10 to form a stacked body, a stacked battery 100 as shown in FIG. 1B is manufactured. The stacked battery 100 is a stacked bipolar battery, in which a plurality of electrode bodies 10, 10,... Are stacked while the spacers 15, 15 of one electrode body 10 are fitted in the recesses 16, 16 of another electrode body 10. It will be. In the stacked battery 100, the positive electrode layer 11, the electrolyte layer 13, and the negative electrode layer 12 are stacked in this order between the current collectors 14 and 14, and these function as the power generation unit 20. In FIG. 1B, the electrode bodies 10 provided at both ends in the stacking direction are in a form (electrode bodies 10a and 10b) in which the outermost electrode layer or electrolyte layer in the stacking direction is not provided. A plurality of electrode bodies 10 are stacked between 10a and 10b. As described above, the electrode body 10 is provided with the spacer 15 and the recessed portion 16 on the front and back of the current collector 14, so that the spacer 15 associated with the other electrode body 10 is disposed in the recessed portion 16 associated with one electrode body 10. When the electrode bodies 10, 10,... Are stacked, the stack position of the positive electrode layer 11 of one electrode body 10 and the stack position of the negative electrode layer 12 and the electrolyte layer 13 of the other electrode body 10 are shifted. Nothing. That is, the stacked battery 100 can be manufactured while the electrode body 10 is easily positioned. In the stacked battery 100, the spacers 15, 15 provided on at least a part of the outer periphery of the power generation unit 20 are fitted in the recesses 16, 16 provided on the power generation unit 20 side of the current collector 14. In the pressing process, the electrode bodies 10 are not displaced from each other, and are produced by appropriately applying pressure.

  From the viewpoint of facilitating positioning of the electrode body 10 and enabling appropriate application of pressure after the electrode body 10 is laminated, each configuration of the electrode body 10 and the laminated battery 100 is particularly designed as follows. It is preferred that

As shown in FIG. 2A, the sum of the thickness of the negative electrode layer 12 and the thickness of the electrolyte layer 13 is x1, the height of the spacer 15 in the stacking direction from the surface of the current collector 14 is x2, and the stacking direction of the recess 16 Assuming that the depth is x3 and the thickness of the positive electrode layer 11 is x4, at least the following formula (1) is satisfied, and as shown in FIG. When performed, it is possible to apply a uniform compressive stress to the electrode material, which is preferable.
x2-x3 <x1 + x4 (1)

When the electrode bodies 10, 10,... Are stacked and then subjected to a pressing process, the pressure σ in the pressing process, the Young's modulus E 1 of the positive electrode layer 11, the Young's modulus E 2 of the electrolyte layer, and the Young's modulus of the negative electrode layer It is preferable that x1, x2, x3, and x4 are obtained from E3. Specifically, for example, according to the following formulas (2) to (6), from the pressure σ, the Young's modulus E1 of the first electrode layer, the Young's modulus E2 of the electrolyte layer, and the Young's modulus E3 of the second electrode layer, X1, x2, x3 or x4 can be calculated.
x2> x1 (2)
x3> x4 (3)
σ = E · Δx (4)
E = E1, E2, E3 / (E1, E2 + E2, E3 + E3, E1) (5)
Δx = (x1 + x3−x2) / (x1 + x4) (6)

  Thus, according to the electrode body 10, since the current collector 14, the spacers 15 and 15, and the recesses 16 and 16 according to the present invention are provided, when the electrode body 10 is stacked, By fitting the spacers 15 into the recesses 16 associated with the other electrode bodies 10, the stacking position of the electrode bodies 10 can be easily positioned, and the plurality of electrode bodies 10, 10. Further, according to the laminated battery 100 according to the present invention, the electrode body 10 is appropriately positioned and laminated by fitting the spacers 15 into the recesses 16, and after the lamination, the press is performed. Also when it uses for a process, the position shift of electrode bodies 10 can be prevented by fitting of the spacer 15. Furthermore, as described above, when the spacer 15 and the concave portion 16 are appropriately designed based on the pressure σ in the pressing process and the Young's moduli E1 to E3 of each layer, the positioning of the electrode body 10 during stacking is easy. In addition, the pressure can be applied more uniformly and more appropriately after lamination.

  In the above description, the electrode body 10 has been described in the form in which the spacers 15 and 15 are provided on the side where the negative electrode layer 12 and the electrolyte layer 13 are provided, and the recesses 16 and 16 are provided on the side where the positive electrode layer 11 is provided. However, the present invention is not limited to this form, and spacers 15 and 15 are provided on the side where the positive electrode layer 11 is provided, and recesses 16 and 16 are provided on the side where the negative electrode layer 12 and the electrolyte layer 13 are provided. Form may be sufficient. However, it is preferable to provide the electrolyte layer 13 on the spacers 15 and 15 side from the viewpoint of suppressing peeling of the electrolyte layer and dropping of the electrolyte (particularly particulate electrolyte).

  In the above description, the electrode body 10 has been described with respect to the form in which the negative electrode layer 12 and the electrolyte layer 13 are provided on one surface of the current collector 14, and the positive electrode layer 11 is provided on the other surface. For example, the positive electrode layer 11 and the electrolyte layer 13 may be provided on one surface of the current collector 14, and the negative electrode layer 12 may be provided on the other surface. The form in which the electrolyte layer 13 is provided on both of the layers 12 may be employed.

  In the above description, the electrode body 10 has been described as having a bipolar electrode structure in which the positive electrode layer 11 and the negative electrode layer 12 are provided on the front and back of the current collector 14, but the present invention is limited to this form. Instead, the positive electrode layer 11, the electrolyte layer 13, and the negative electrode layer 12 may be laminated in this order on one surface of the current collector 14. However, when each electrode layer and electrolyte layer are formed by applying a paste on the current collector 14, the viewpoint of preventing cracking, warping or peeling of the layer when the paste is dried and solidified, and the electrode body From the viewpoint of preventing self-discharge in the electrode 10, the electrode body 10 preferably has a bipolar electrode structure in which the positive electrode layer 11 and the negative electrode layer 12 are provided on the front and back of the current collector 14.

  In addition, as shown in FIG. 3, the electrode body 10 is preferably provided with a seal member 30 on the surface of each electrode layer or electrolyte layer during storage before the stacked battery 100 is formed. As the sealing member 30, a known sealing material can be used without any particular limitation, and for example, it is preferable to use one made of an olefin resin. Thereby, the electrode body 10 can be stored without attaching dust or the like to the power generation unit.

  In the above description, the multilayer battery 100 has been described as having a plurality of electrode bodies 10 laminated. However, the present invention is not limited to this embodiment, and the current collector 14 of the multilayer battery 10 is not limited to this configuration. Any stacked battery may be used as long as a spacer 15 is provided between the spacers 15 and the spacer 15 is fitted in a recess 16 provided in the current collector 14. That is, the current collector 14 is disposed on at least one surface, and the spacers 15 and 15 are provided on at least a part of the outer periphery of the position where the power generator 20 is disposed on one surface side of the current collector 14. The current collector 14 is disposed using the current collector 14 in which concave portions 16 are formed at positions corresponding to positions where the spacers 15 are disposed on the other surface side of the current collector 14. Are stacked together with the power generation unit 20, and the spacers 15 and 15 are fitted in the recesses 16 and 16, or a stacked battery, or one current collector 14 (first current collector 14) and another current collector. A power generation unit 20 is provided between the current collector 14 and the second current collector 14, and spacers 15 and 15 are provided on at least a part of the outer periphery of the power generation unit 20. At least one of the current collectors 14 on the power generation unit 20 side The surface, recess 16, 16 are provided, the spacers 15, 15 in the recesses 16, 16 is fitted, may be a stacked type battery. However, from the viewpoint that the multilayer battery 100 can be easily manufactured, the multilayer battery 100 in which a plurality of electrode bodies 10 are stacked is preferable.

  The design of the stacked battery 100 according to the present invention will be described with reference to examples.

1. Conventional example (comparative example)
As shown in FIG. 4A, the positive electrode paste is applied and dried on the current collector 14 by a doctor blade to form a positive electrode layer 511, and then the electrolyte is applied on the positive electrode layer 511 by a doctor blade. The paste was applied and dried to form the electrolyte layer 513, and then the negative electrode paste was applied and dried on the electrolyte layer 513 with a doctor blade to form the negative electrode layer 512. When the electrode body 510 thus fabricated was observed externally, cracks and warpage occurred between the respective layers as shown in FIG. 4B. This is considered to be caused by the difference in the coefficient of thermal expansion of each layer during the paste drying process. In addition, the electrode body 510 has a positive electrode layer, an electrolyte layer, and a negative electrode layer laminated in this order, which may cause self-discharge. In addition, when a plurality of prepared electrode bodies 510 are prepared and stacked, it is difficult to position the electrode body 510. Moreover, when it used for a constraining press process after lamination | stacking, position shift of electrode body 510 produced.

2. Example 1
In the constraining press step after the electrode body 10 is laminated, the applied compressive stress is set to 150 kgf / cm ² (1470 N / cm ² ), and the thickness of each electrode layer, electrolyte layer, and recess shown in FIG. The depth of 16 was as shown in Table 1 below. Each Young's modulus of the positive electrode layer 11, the negative electrode layer 12, and the electrolyte layer 13 was as shown in Table 2 below. In this case, when the optimum spacer height x2 was determined by the following formulas (4) to (6), the spacer height x2 was 365.6 μm.
σ = E · Δx (4)
E = E1, E2, E3 / (E1, E2 + E2, E3 + E3, E1) (5)
Δx = (x1 + x3−x2) / (x1 + x4) (6)

  A spacer was designed based on the calculated value, and a plurality of electrode bodies 10 were produced using the spacer. The produced electrode body 10 was not warped and cracked as compared with the comparative example. After that, when the laminated battery 100 was manufactured using the electrode body 10, the electrode body 10 can be laminated while being easily positioned when the electrode body 10 is laminated, and the electrode body 10 can also be used in the subsequent pressing process. The pressure could be applied uniformly and appropriately without any deviation.

3. Example 2
After the electrode body 10 is laminated, the compressive stress applied in the pressing step is set to 15 kgf / cm ² (147 N / cm ² ), and the thickness of each electrode layer, electrolyte layer, spacer 15 shown in FIG. The height was as shown in Table 3 below. The respective Young's moduli of the positive electrode layer 11, the negative electrode layer 12, and the electrolyte layer 13 were as shown in Table 4 below. In this case, when the optimum recess 16 depth x3 was determined by the following formulas (4) to (6), the recess depth x3 was 51.7 μm.
σ = E · Δx (4)
E = E1, E2, E3 / (E1, E2 + E2, E3 + E3, E1) (5)
Δx = (x1 + x3−x2) / (x1 + x4) (6)

  Based on the calculated value, the current collector 14 was provided with a recess, and a plurality of electrode bodies 10 were produced using this. The produced electrode body 10 was warped as compared with the comparative example, and cracks were reduced. After that, when the laminated battery 100 was manufactured using the electrode body 10, the electrode body 10 can be laminated while being easily positioned when the electrode body 10 is laminated, and the electrode body 10 can also be used in the subsequent pressing process. The pressure could be applied uniformly and appropriately without any deviation.

  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. The present invention can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and current collectors and stacked batteries with such changes are also included in the technical scope of the present invention. Must be understood.

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

DESCRIPTION OF SYMBOLS 10 Electrode body 11 Positive electrode layer 12 Negative electrode layer 13 Electrolyte layer 14 Current collector 15 Spacer 16 Recessed part 20 Power generation part 100 Multilayer battery

Claims (3)

A current collector having a power generation unit disposed on at least one surface,
On one side of the current collector, a spacer is disposed on at least a part of the outer periphery of the position where the power generation unit is disposed,
A current collector in which a recess is formed at a position corresponding to a position at which the spacer is disposed on the other surface side of the current collector. A plurality of current collectors according to claim 1 are laminated together with a power generation unit,
A stacked battery, wherein the spacer is fitted in the recess. A power generation unit is provided between the first current collector and the second current collector,
A spacer is installed on at least a part of the outer periphery of the power generation unit,
At least one of the first current collector or the second current collector is provided with a recess on the surface on the power generation unit side,
A stacked battery in which the spacer is fitted in the recess.

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