阅读说明：本技术 电池 (Battery with a battery cell ) 是由 伊东裕介 古贺英一 于 2020-10-28 设计创作，主要内容包括：本公开的电池(1000)具备：具有层叠的正极层(102、105)、负极层(103、106)和电解质层(104)的发电元件(110)；以及支撑所述发电元件(110)的支撑体(200),所述发电元件具有与所述层叠的方向(z)水平的面即第1平面(111)、和与所述层叠的方向垂直的面即第2平面(112),所述支撑体(200)具有与所述第1平面相接的第1支撑体部(210)、和包含在与所述第2平面垂直的方向(z)上对所述发电元件赋予弹性力的弯曲部(221)的第2支撑体部(200)。由发电元件的膨胀引起的应力主要在层叠的方向(z)上产生。弯曲部(221)同样能够在层叠的方向(z)上赋予弹性力。通过设置这样的弯曲部,即使发电元件发生膨胀,用于支撑发电元件的压力也难以增加,因此能够抑制发电元件中的剥离或裂纹的产生。(A battery (1000) is provided with: a power generation element (110) having a positive electrode layer (102, 105), a negative electrode layer (103, 106), and an electrolyte layer (104) that are laminated; and a support body (200) that supports the power generating element (110), wherein the power generating element has a 1 st plane (111) that is a plane horizontal to the stacking direction (z) and a 2 nd plane (112) that is a plane perpendicular to the stacking direction, and the support body (200) has a 1 st support body (210) that contacts the 1 st plane and a 2 nd support body (200) that includes a bending portion (221) that imparts an elastic force to the power generating element in the direction (z) perpendicular to the 2 nd plane. The stress caused by the expansion of the power generating element is mainly generated in the stacking direction (z). The bending portion (221) can also apply an elastic force in the stacking direction (z). By providing such a bent portion, even if the power generation element expands, the pressure for supporting the power generation element is less likely to increase, and therefore, the occurrence of peeling or cracking in the power generation element can be suppressed.)

1. A battery includes a power generating element and a support body,

The power generating element has a positive electrode layer, a negative electrode layer and an electrolyte layer which are laminated,

the support body supports the power generating element,

the power generating element has a 1 st plane and a 2 nd plane, the 1 st plane being a plane horizontal to the stacking direction, the 2 nd plane being a plane perpendicular to the stacking direction,

the support body has a 1 st support body portion and a 2 nd support body portion, the 1 st support body portion is in contact with the 1 st plane, and the 2 nd support body portion includes a bent portion that imparts an elastic force to the power generation element in a direction perpendicular to the 2 nd plane.

2. The battery as set forth in claim 1, wherein,

the support body is an electrode terminal, and the electrode terminal is,

the support is connected to one of the positive electrode layer and the negative electrode layer.

3. The battery according to claim 1 or 2,

the 2 nd support body further includes parallel face portions extending in parallel along the 2 nd plane,

the parallel face portion meets the 2 nd plane.

4. The battery according to claim 1 or 2,

the 2 nd support body is isolated from the 2 nd plane.

5. The battery according to claim 1, 2 or 4,

the apparatus further comprises a resin member positioned between the 2 nd support body and the 2 nd plane.

6. The battery according to any one of claims 1 to 5,

the 1 st support body is in contact with the entire 1 st plane.

7. The battery according to any one of claims 1 to 6,

the support protrudes from the 2 nd plane in a direction perpendicular to the 2 nd plane by 1mm to 10 mm.

8. The battery according to any one of claims 1 to 7,

the support protrudes from the 1 st plane in a direction opposite to the power generating element by 0.1mm to 10 mm.

9. The battery according to any one of claims 1 to 8,

the support is composed of a plate member having a thickness of 50 μm or more and 5000 μm or less.

10. The battery according to any one of claims 1 to 9,

the electrolyte layer is a solid electrolyte layer.

11. The battery according to any one of claims 1 to 10,

the power generating element has a plurality of stacked battery cells,

the plurality of battery cells have the positive electrode layer, the negative electrode layer, and the electrolyte layer, respectively.

12. The battery according to any one of claims 1 to 11,

the shape of a cut surface of the bent portion cut along a plane perpendicular to the 1 st plane and the 2 nd plane includes a U shape, a V shape, or an L shape.

Technical Field

The present disclosure relates to batteries.

Background

Patent document 1 discloses a connecting member for connecting a power generating element including a positive electrode, a negative electrode, and an electrolyte. The connecting member is composed of a flat surface portion and a bent portion, and the bottom surface portion of the power generating element and the flat surface portion of the connecting member are disposed in contact with each other.

Prior art documents

Patent document 1: japanese patent laid-open publication No. 2016-170941

Disclosure of Invention

Problems to be solved by the invention

The present disclosure provides a battery with high reliability.

Means for solving the problems

According to non-limiting exemplary embodiments of the present disclosure, the following technical solutions are provided.

A battery according to one aspect of the present disclosure includes a power generating element having a positive electrode layer, a negative electrode layer, and an electrolyte layer stacked one on another, and a support supporting the power generating element, wherein the power generating element has a 1 st plane and a 2 nd plane, the 1 st plane is a plane horizontal to a stacking direction, the 2 nd plane is a plane perpendicular to the stacking direction, the support has a 1 st support body portion and a 2 nd support body portion, the 1 st support body portion is in contact with the 1 st plane, the 2 nd support body portion includes a bent portion that imparts an elastic force to the power generating element in a direction perpendicular to the 2 nd plane.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure, a highly reliable battery can be provided.

Drawings

Fig. 1 is a perspective view showing a schematic configuration of a battery according to embodiment 1.

Fig. 2 is a cross-sectional view of the power generating element taken along line II-II in fig. 1.

Fig. 3A is a side view of the battery according to the embodiment when the battery is housed in the case.

Fig. 3B is a side view of the battery of the comparative example when it is housed in the case.

Fig. 4A is a side view of the periphery of the 2 nd support body part included in the battery according to modification examples 1 to 3 of the embodiment.

Fig. 4B is a side view of the periphery of the 2 nd support body part included in the battery according to modification examples 4 to 6 of the embodiment.

Fig. 5 is a side view of the battery according to modification 7 of the embodiment when the battery is housed in the case.

Detailed Description

(insight underlying the present disclosure)

The present inventors have found that the following problems occur with the technique of patent document 1 described in "background art".

First, the present inventors will focus on the description. A problem with conventional batteries is a reduction in reliability due to a volume change of a power generating element accompanying charge and discharge.

For example, a battery including a solid electrolyte will be described. More specifically, the battery includes a power generating element having a solid electrolyte and an electrode active material stacked. Such a battery is, for example, an all-solid battery. Since the constituent members (i.e., the solid electrolyte and the electrode active material) of such a battery are solid materials, the interface between the electrode active material and the solid electrolyte is a solid-solid interface.

Generally, an all-solid battery is manufactured by performing press molding. Depending on the conditions of the press molding, the particles (here, the particles refer to, for example, electrode active material particles and/or solid electrolyte particles) may not be sufficiently bonded to each other, and therefore, the charge-discharge reaction in the power generation element may not progress uniformly. Further, since the electrode active material expands and contracts with charge and discharge, when there are many electrode active material particles having different charge and discharge depths, stress is generated at each location in the power generating element. The stress is applied to the entire power generation element, and thereby peeling between the electrode active material and the solid electrolyte or fine cracks are generated in the electrode active material and the solid electrolyte. Accordingly, the ion conduction or electron conduction path is cut off, and the battery characteristics are greatly degraded.

It is known that stress caused by expansion of the electrode active material (i.e., stress caused by expansion of the power generating element) is mainly generated in the direction in which the solid electrolyte and the electrode active material are stacked. Thus, the opposing surfaces (e.g., the bottom surface and the top surface) of the power generating element perpendicular to the stacking direction are easily affected by the stress caused by expansion of the power generating element, and are easily deformed outward of the power generating element.

However, in order to mount the battery to the case or the like, the battery needs to be supported. For example, in patent document 1, a power generating element (battery) is supported by a connecting member. Specifically, the connecting member is supported so as to sandwich the opposing surfaces of the power generating element (negative electrode can bottom surface portion and positive electrode can bottom surface portion in patent document 1).

Therefore, if the expanded power generation element (cell) is supported so as to be sandwiched by the connection member, there is a possibility that a pressure for supporting the power generation element is generated in a direction opposite to the stress caused by the expansion (i.e., a direction in which the expansion of the power generation element is suppressed). In this case, if expansion of the power generation element occurs, stress caused by the expansion of the power generation element presses the connection member. As a result, the connection member is pressed back, so that the pressure for supporting the power generation element increases, that is, the force for suppressing expansion of the power generation element increases, and therefore, peeling or cracking in the power generation element is more likely to occur.

Thereby, battery characteristics are greatly degraded. Such a battery has low reliability.

(summary of the present disclosure)

In order to solve the above problem, a battery according to one aspect of the present disclosure includes a power generating element having a positive electrode layer, a negative electrode layer, and an electrolyte layer stacked one on another, and a support supporting the power generating element, wherein the power generating element has a 1 st plane and a 2 nd plane, the 1 st plane is a plane horizontal to a stacking direction, the 2 nd plane is a plane perpendicular to the stacking direction, the support has a 1 st support body portion and a 2 nd support body portion, the 1 st support body portion is in contact with the 1 st plane, the 2 nd support body portion includes a bent portion that imparts an elastic force to the power generating element in a direction perpendicular to the 2 nd plane.

Thus, the 1 st support body is supported in contact with the 1 st plane. Since the 1 st plane is in a direction horizontal to the direction of lamination, it is less likely to be affected by stress due to expansion of the power generation element and is less likely to be deformed. Since the 1 st support body is supported in contact with the 1 st plane, the support body can easily support the power generating element.

In addition, stress caused by expansion of the power generating element is mainly generated in the direction of lamination. The bent portion can also impart an elastic force in the stacking direction. By providing such a bent portion, even if expansion of the power generation element occurs, the pressure for supporting the power generation element is less likely to increase, and therefore, peeling or cracking in the power generation element can be suppressed.

That is, by providing the support body, it is possible to easily support the power generation element and to suppress the occurrence of peeling or cracks in the power generation element. Thus, a battery with high reliability can be obtained.

In addition, for example, it is possible to provide: the support is an electrode terminal, and is connected to one of the positive electrode layer and the negative electrode layer.

Thus, the support body supports the power generating element and is electrically connected to the power generating element, so that additional electrodes and the like are not required. Therefore, the battery can be prevented from being enlarged.

In addition, for example, it is possible to provide: the 2 nd support body further includes a parallel face portion extending in parallel along the 2 nd plane, the parallel face portion being contiguous with the 2 nd plane.

Thus, the support body can support the power generating element more easily by the 1 st support body portion supporting the 1 st plane and the parallel face portion supporting the 2 nd plane.

In addition, for example, it is possible to provide: the 2 nd support body is isolated from the 2 nd plane.

Thus, even if the power generating element expands, the 2 nd plane of the power generating element does not contact the 2 nd support body, and the 2 nd plane does not receive a pressure from the 2 nd support body. This can suppress the occurrence of separation and cracks in the power generating element.

In addition, for example, it is possible to provide: the apparatus further comprises a resin member positioned between the 2 nd support body and the 2 nd plane.

Thus, the support body can support the power generating element more easily by supporting the 1 st plane by the 1 st support body portion and supporting the 2 nd plane by the 2 nd support member via the resin member.

In addition, for example, it is possible to provide: the 1 st support body is in contact with the entire 1 st plane.

Thus, the support body can more easily support the power generating element by increasing the contact area between the support body and the power generating element.

In addition, for example, it is possible to provide: the support protrudes from the 2 nd plane in a direction perpendicular to the 2 nd plane by 1mm to 10 mm.

Thus, a sufficient space is generated around the power generating element by the projecting distance of 1mm or more. Therefore, even if the power generating element expands, the 2 nd plane of the power generating element does not come into contact with the surrounding object, and the 2 nd plane does not receive a pressure from the surrounding object. This can suppress the occurrence of separation or cracks in the power generating element.

In addition, when the protruding distance is 10mm or less, unnecessary space around the power generating element can be reduced, and the increase in size of the battery can be suppressed.

In addition, for example, it is possible to provide: the support protrudes from the 1 st plane in a direction opposite to the power generating element by 0.1mm to 10 mm.

As described above, the power generating element is deformed mainly in the stacking direction. However, the power generating element is also slightly deformed in a direction perpendicular to the stacking direction. Therefore, by setting the distance of projection in the direction perpendicular to the stacking direction (for example, the direction from the 1 st plane to the opposite side of the power generating element) to 0.1mm or more, even if the power generating element is deformed so as to extend in the direction perpendicular to the stacking direction, the power generating element can be allowed to be deformed in the perpendicular direction. Therefore, the deformation of the power generating element can be alleviated, and the reliability of the battery can be improved.

In addition, by further reducing the protruding distance, the battery can be mounted in a smaller area. Therefore, by setting the protruding distance to 10mm or less, the battery can be prevented from being enlarged.

In addition, for example, it is possible to provide: the support is composed of a plate member having a thickness of 50 μm or more and 5000 μm or less.

Thus, when the thickness is 50 μm or more, the mechanical strength of the support is improved. When the thickness is 5000 μm or less, a bent portion is easily formed in the support.

In addition, for example, it is possible to provide: the electrolyte layer is a solid electrolyte layer.

This can improve the reliability of the all-solid-state battery including the solid electrolyte.

In addition, for example, it is possible to provide: the power generation element has a plurality of stacked battery cells each having the positive electrode layer, the negative electrode layer, and the electrolyte layer.

Thus, a battery having an improved voltage or capacity can be obtained by stacking a plurality of battery cells. In such a battery, the reliability of the battery can be improved.

In addition, for example, it is possible to provide: the shape of a cut surface of the bent portion cut along a plane perpendicular to the 1 st plane and the 2 nd plane includes a U shape, a V shape, or an L shape.

Accordingly, the shape of the cut surface of the bent portion includes the above shape, and a sufficient elastic force can be exerted.

Hereinafter, embodiments of the battery according to the present disclosure will be described with reference to the drawings.

The embodiments described below are merely preferred specific examples. Therefore, the numerical values, shapes, materials, constituent elements, arrangement and connection forms of the constituent elements, and the like shown in the following embodiments are merely examples, and the present disclosure is not intended to be limited thereto. Thus, among the components of the following embodiments, components not described in the independent claims representing the highest concept will be described as arbitrary components. The drawings are schematic and are not necessarily strictly illustrated. In the drawings, the same components are denoted by the same reference numerals.

In addition, various elements shown in the drawings are schematically illustrated only for the convenience of understanding the present disclosure, and the size ratio, the appearance, and the like thereof may differ from real objects. That is, the drawings are schematic and are not necessarily strictly illustrated. Therefore, for example, the scales in the drawings do not always match. In the present specification, numerical ranges are not intended to be strict, but include substantially equivalent ranges, including, for example, differences of about several%.

In the description of the structure in the present specification, the terms "upper" and "lower" do not mean an upper side (vertically upper) and a lower side (vertically lower) in absolute spatial recognition, but are used as terms defined by a relative positional relationship based on the stacking order in the stacked structure.

In the following description, lithium, sulfur, phosphorus, silicon, boron, germanium, fluorine, chlorine, bromine, iodine, oxygen, aluminum, gallium, indium, iron, zinc, titanium, lanthanum, zirconium, nitrogen, hydrogen, arsenic, antimony, tellurium, carbon, selenium, yttrium, and magnesium may be represented As Li, S, F, Cl, Br, I, O, Al, Ga, In, Fe, Zn, Ti, La, Zr, N, H, As, Sb, Te, C, Se, Y, and Mg.

(embodiment mode)

Battery 1000 according to the embodiment will be described with reference to fig. 1 to 3B.

Fig. 1 is a perspective view showing a schematic configuration of a battery 1000 according to the present embodiment. Fig. 2 is a sectional view showing a cross section of the power generating element 110 taken along line II-II in fig. 1. Fig. 3A is a side view of the battery 1000 according to the present embodiment when it is housed in the case 400. Fig. 3B is a side view of the battery 1000x of the comparative example when it is housed in the case 400.

The battery 1000 of the present embodiment includes a power generating element 110 and a support 200. The battery 1000 according to the present embodiment is housed in a case (see fig. 3).

First, the power generation element 110 will be described with reference to fig. 1 and 2.

The power generating element 110 includes a plurality of stacked battery cells 101 and an insulating portion 120. Each of the plurality of battery cells 101 has a positive electrode layer, a negative electrode layer, and an electrolyte layer. Thus, the power generating element 110 has a positive electrode layer, a negative electrode layer, and an electrolyte layer stacked. In the present embodiment, the positive electrode layer includes a positive electrode 102 and a positive electrode collector 105, the negative electrode layer includes a negative electrode 103 and a negative electrode collector 106, and the electrolyte layer is a solid electrolyte layer 104.

The planar shape of the power generation element 110 (i.e., the shape when the power generation element 110 is viewed in the negative z-axis direction) is a rectangle, but is not limited thereto. The area of the main surface (the observation surface when viewed from above) of the power generation element 110 may be, for example, 1cm²Above and 1000cm²The following.

The positive electrode 102 is a layer containing a positive electrode active material. The positive electrode 102 may be a positive electrode mixture layer containing a positive electrode active material and a solid electrolyte.

As the positive electrode active material contained in the positive electrode 102, for example, a lithium-containing transition metal oxide, transition metal fluoride, polyanion material, fluorinated polyanion material, transition metal sulfide, transition metal oxyfluoride, transition metal oxysulfide, transition metal oxynitride, or the like can be used. In particular, when a lithium-containing transition metal oxide is used as the positive electrode active material, the average discharge voltage can be increased while reducing the production cost.

The shape of the positive electrode active material may be a particle shape. In this case, the median diameter of the positive electrode active material particles may be 0.1 μm or more and 100 μm or less. If the median diameter of the positive electrode active material particles is less than 0.1 μm, the positive electrode 102 may not be able to form a good dispersion state between the positive electrode active material particles and the solid electrolyte. This causes degradation of charge/discharge characteristics of the battery. In addition, if the median diameter of the positive electrode active material particles is larger than 100 μm, ion diffusion in the positive electrode active material particles becomes slow. Therefore, the operation of the battery at a high output sometimes becomes difficult. The median particle diameter of the positive electrode active material particles may be larger than the median particle diameter of the solid electrolyte particles. This makes it possible to form a good dispersion state of the positive electrode active material and the solid electrolyte.

The thickness (i.e., the length in the z-axis direction) of the positive electrode 102 may be 10 to 500 μm. When the thickness of the positive electrode 102 is less than 10 μm, it may be difficult to ensure a sufficient energy density of the battery. When the thickness of the positive electrode 102 is larger than 500 μm, the operation at high output may become difficult.

As the positive electrode current collector 105, for example, a porous or nonporous sheet or film made of a material such as aluminum, stainless steel, titanium, or an alloy of these metals can be used. Aluminum and an alloy of aluminum are inexpensive and easily made into a thin film. The sheet or film may be a metal foil, a wire mesh sheet, or the like. The thickness of the positive electrode current collector 105 may be 1 to 30 μm. When the thickness of the positive electrode current collector 105 is less than 1 μm, the mechanical strength is insufficient, and cracks or fractures are likely to occur. When the thickness of the positive electrode current collector 105 is larger than 30 μm, the energy density of the battery may decrease.

The negative electrode 103 is a layer containing a negative electrode active material. The negative electrode 103 may be a negative electrode mixture layer containing a negative electrode active material and a solid electrolyte.

As the anode active material contained in the anode 103, for example, a material that occludes and releases metal ions may be mentioned. The negative electrode active material may be, for example, a material that occludes and releases lithium ions. As the negative electrode active material, for example, lithium metal, a metal or an alloy that exhibits an alloying reaction with lithium, carbon, a transition metal oxide, a transition metal sulfide, or the like can be used. As the metal or alloy that exhibits an alloying reaction with lithium, for example, a silicon compound, a tin compound, or an alloy of an aluminum compound and lithium, or the like can be used. As the carbon, for example, non-graphite carbon such as graphite, hard carbon, or coke can be used. As the transition metal oxide, for example, copper oxide (CuO), nickel oxide (NiO), or the like can be used. As the transition metal sulfide, for example, copper sulfide represented by CuS or the like can be used. In particular, when carbon is used as the negative electrode active material, the average discharge voltage can be increased while reducing the production cost. From the viewpoint of capacity density, silicon (Si), tin (Sn), a silicon compound, or a tin compound is preferably used as the negative electrode active material.

The shape of the negative electrode active material may be a particle shape. In this case, the median diameter of the negative electrode active material particles may be 0.1 μm or more and 100 μm or less. If the median diameter of the negative electrode active material particles is less than 0.1 μm, the negative electrode active material particles and the solid electrolyte may not be in a good dispersion state in the negative electrode 103. This causes degradation of charge/discharge characteristics of the battery. In addition, if the median diameter of the negative electrode active material particles is larger than 100 μm, lithium diffusion in the negative electrode active material particles becomes slow. Therefore, the operation of the battery at a high output sometimes becomes difficult. The median particle diameter of the anode active material particles may be larger than the median particle diameter of the solid electrolyte particles. This makes it possible to form a good dispersion state of the negative electrode active material and the solid electrolyte.

The thickness of the negative electrode 103 may be 10 μm to 500 μm. When the thickness of the negative electrode 103 is less than 10 μm, it may be difficult to secure a sufficient energy density of the battery. When the thickness of the negative electrode 103 is larger than 500 μm, the operation at high output may become difficult.

As the negative electrode current collector 106, for example, a porous or nonporous sheet or film made of a metal material such as stainless steel, nickel, copper, or an alloy of these metals can be used. Copper and copper alloys are inexpensive and easy to be made into thin films. The sheet or film may be a metal foil, a wire mesh sheet, or the like. The thickness of the negative electrode current collector 106 may be 1 to 30 μm. When the thickness of the negative electrode current collector 106 is less than 1 μm, the mechanical strength is insufficient, and cracks or fractures are likely to occur. When the thickness of the negative electrode current collector 106 is larger than 30 μm, the energy density of the battery may decrease.

The solid electrolyte layer 104 contains a solid electrolyte.

The thickness of the solid electrolyte layer 104 may be 1 to 200 μm. When the thickness of the solid electrolyte layer 104 is less than 1 μm, the possibility of short-circuiting the positive electrode 102 and the negative electrode 103 becomes high. Further, when the thickness of the solid electrolyte layer 104 is larger than 200 μm, the operation at high output may become difficult.

As the solid electrolyte contained in the positive electrode 102, the negative electrode 103, and the solid electrolyte layer 104, for example, a sulfide solid electrolyte, an oxide solid electrolyte, a halide solid electrolyte, a polymer solid electrolyte, a complex hydride solid electrolyte, or the like can be used. The solid electrolytes contained in the cathode 102, the anode 103, and the solid electrolyte layer 104 may be composed of different materials, respectively.

As the sulfide solid electrolyte, for example, Li can be used₂S-P₂S₅、Li₂S-SiS₂、Li₂S-B₂S₃、Li₂S-GeS₂、Li_3.25Ge_0.25P_0.75S₄、Li₁₀GeP₂S₁₂And the like. Further, LiX (X: F, Cl, Br, I), Li may be added thereto₂O, MOp, LiqMOr (M: any of P, Si, Ge, B, Al, Ga, In, Fe, Zn) (P, q, r: natural numbers), and the like.

As the oxide solid electrolyte, for example, LiTi can be used₂(PO₄)₃NASICON (Na Super Ionic Conductor) type solid electrolyte represented by element substitution thereof, and (LaLi) TiO (titanium oxide) type solid electrolyte ₃Perovskite type solid electrolyte of system, and Li₁₄ZnGe₄O₁₆、Li₄SiO₄、LiGeO₄Lithium Super Ionic Conductor (LiSICON) type solid electrolyte typified by element substitution thereof, and Li₇La₃Zr₂O₁₂Garnet-type solid electrolyte typified by element substitution product thereof, and Li₃N and its H substituent, Li₃PO₄And N-substituted form thereof, or LiBO₂Or Li₃BO₃Adding Li to the Li-B-O compound as a matrix₂SO₄Or Li₂CO₃And glass or glass fibers obtained by the above method.

As the halide solid electrolyte, for example, Li having a composition formula of_αM_βX_γThe material represented by (a) wherein α, β and γ are values larger than 0, and M contains at least one of a metal element other than Li and a semimetal element, and X is one or two or more elements selected from Cl, Br, I and F. Here, the semimetal element is B, Si, Ge, As, Sb or Te. The metal elements are all elements contained in groups 1 to 12 of the periodic table except hydrogen, and all elements contained in groups 13 to 16 except the above-mentioned semimetal element and C, N, P, O, S, Se. That is, the metal element is an element group which can be a cation when forming an inorganic compound with a halogen compound. As the halide solid electrolyte, for example, Li can be used ₃YX₆、Li₂MgX₄、Li₂FeX₄、LiAX₄Or Li₃AX₆(wherein A is Al, Ga or In) and the like (X: F, Cl, Br, I).

As the polymer solid electrolyte, for example, a compound of a polymer compound and a lithium salt can be used. The polymer compound may have an ethylene oxide structure. Since the polymer compound has an ethylene oxide structure, a large amount of lithium salt can be contained, and the ionic conductivity can be further improved. As the lithium salt, LiPF may be used₆、LiBF₄、LiSbF₆、LiAsF₆、LiSO₃CF₃、LiN(SO₂CF₃)₂、LiN(SO₂C₂F₅)₂、LiN(SO₂CF₃)(SO₂C₄F₉) Or LiC (SO)₂CF₃)₃And the like. As the lithium salt, one selected from these may be used alone. Alternatively, as the lithium salt, a mixture of two or more lithium salts selected from these may also be used.

As the complex hydride solid electrolyte, for example, LiBH can be used₄-LiI or LiBH₄-P₂S₅And the like.

In addition, the shape of the solid electrolyte may be a particle shape.

At least one of the positive electrode 102, the solid electrolyte layer 104, and the negative electrode 103 may contain a binder for the purpose of improving the adhesion between particles. The binder is used to improve the adhesiveness of the material constituting the electrode. Examples of the binder include polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, polyimide, polyamideimide, polyacrylonitrile, polyacrylic acid, polymethyl acrylate, polyethyl acrylate, polyhexamethyl acrylate, polymethacrylic acid, polymethyl methacrylate, polyethyl methacrylate, polyhexamethyl methacrylate, polyvinyl acetate, polyvinylpyrrolidone, polyether sulfone, hexafluoropropylene, styrene-butadiene rubber, and carboxymethyl cellulose. In addition, as the binder, a copolymer of two or more materials selected from tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoroalkyl vinyl ether, vinylidene fluoride, chlorotrifluoroethylene, ethylene, propylene, pentafluoropropylene, fluoromethyl vinyl ether, acrylic acid, and hexadiene can be used. Two or more kinds selected from these may be mixed and used as the binder.

At least one of the positive electrode 102 and the negative electrode 103 may contain a conductive assistant for the purpose of improving electron conductivity. Examples of the conductive aid include carbon fluoride, graphite such as natural graphite and artificial graphite, carbon black such as acetylene black and ketjen black (registered trademark), conductive fibers such as carbon fibers and metal fibers, metal powders such as aluminum, conductive whiskers such as zinc oxide and potassium titanate, conductive metal oxides such as titanium oxide, and conductive polymer compounds such as polyaniline, polypyrrole, and polythiophene. When a carbon conductive aid such as graphite or carbon black is used, cost reduction can be achieved.

The insulating portion 120 is a layer having insulating properties and covering a surface parallel to the stacking direction of the power generating element 110. The surface parallel to the stacking direction of the power generating element 110 refers to a surface parallel to the yz plane and a surface parallel to the zx plane of the power generating element 110.

The insulating portion 120 has an insulating property to the extent that the support 200 can be electrically insulated from the positive electrode layer or the negative electrode layer of the power generating element 110 when the support 200 is an electrode terminal (details will be described later).

The material constituting the insulating portion 120 is, for example, a resin material, but is not particularly limited thereto.

In addition, as shown in fig. 2, in each battery cell 101, a negative electrode layer (negative electrode current collector 106 and negative electrode 103), an electrolyte layer (solid electrolyte layer 104), and a positive electrode layer (positive electrode 102 and positive electrode current collector 105) are laminated in this order. Thus, the stacking direction is along the z-axis.

As shown in fig. 1, the power generating element 110 has a 1 st plane 111, which is a plane horizontal to the stacking direction, and a 2 nd plane 112, which is a plane perpendicular to the stacking direction. Since the stacking direction is a direction along the z-axis, the 1 st plane 111 is a plane parallel to the yz-plane, and the 2 nd plane 112 is a plane parallel to the xy-plane. The power generation element 110 may have a 3 rd plane 113 opposite to the 1 st plane 111.

In the present embodiment, the 1 st plane 111 and the 3 rd plane 113 are surfaces where the insulating portion 120 is exposed, and the 2 nd plane 112 is a surface where the negative electrode current collector 106 included in the negative electrode layer is exposed.

The known power generation element 110 expands mainly in the direction of lamination. Thereby, the power generation element 110 is deformed so as to extend mainly in the z-axis positive direction and the z-axis negative direction. Therefore, the 1 st plane 111 and the 3 rd plane 113 are less likely to be affected by stress due to expansion of the power generation element 110, and are less likely to be deformed. On the other hand, the 2 nd plane 112 is easily affected by stress due to expansion of the power generation element 110, and is easily deformed.

Next, the case 400 will be described with reference to fig. 3A. Fig. 3A is a side view of battery 1000 and a side view of case 400.

The case 400 is a container for accommodating the battery 1000. The case 400 may receive a plurality of batteries 1000. The shape of the case 400 is a rectangular parallelepiped shape having an internal space for housing the battery 1000, but is not particularly limited. The case 400 is made of metal or resin, but is not particularly limited.

As shown in fig. 3A, the case 400 has an upper surface portion 401 and a bottom surface portion 402. The upper surface portion 401 is in contact with the power generating element 110. In the inner space of the case 400, a support 200 is used to mount the battery 1000.

Next, the support 200 will be described with reference to fig. 1 and 3A. Further, fig. 3A shows a direction P in which stress is generated due to expansion of the power generation element 110.

The support body 200 is a member that supports the power generation element 110. A bonding layer may be provided between the support 200 and the power generating element 110, for example.

The supporter 200 has a 1 st support body portion 210 and a 2 nd support body portion 220.

The 1 st support body 210 meets the 1 st plane 111. More specifically, the 1 st support body 210 is supported in contact with the 1 st plane 111. The 1 st support body 210 is flat, but is not particularly limited as long as it can contact the 1 st plane 111.

In this way, the 1 st support body 210 is supported in contact with the 1 st plane 111 that is less likely to be deformed by the influence of stress due to expansion of the power generation element 110. Therefore, the support body 200 can easily support the power generation element 110.

As shown in fig. 1, the 1 st support body 210 may be in contact with the entire surface of the 1 st plane 111.

In this way, by increasing the contact area of the support body 200 and the power generation element 110, the support body 200 can more easily support the power generation element 110.

Further, the 1 st support body 210 may be connected to a portion of the 1 st plane 111. For example, the y-axis direction length d2 of the 1 st support body 210 may be smaller than the y-axis direction length of the power generation element 110.

The 2 nd support body 220 may be connected with the bottom surface part 402 of the case 400. That is, the bottom surface portion 402 is a support surface as a surface that supports the battery 1000.

Further, by providing the support body 200, the power generating element 110 is separated from the support surface (the bottom surface portion 402 of the case).

The 2 nd support body 220 includes a curved portion 221 and a parallel face portion 222.

The parallel surface portion 222 extends parallel to the 2 nd plane 112 of the power generating element 110, and is in contact with the 2 nd plane 112. The 2 nd support body 220 may include a parallel face portion 222 to which the 1 st support body 210 is connected.

In this way, by the 1 st support body 210 supporting the 1 st plane 111 and the parallel face portion 222 supporting the 2 nd plane 112, the support body 200 can more easily support the power generation element 110.

The bent portion 221 is a portion that applies an elastic force to the power generation element 110 in a direction perpendicular to the 2 nd plane 112. In the present embodiment, the shape of the cut surface of the curved portion 221 cut along a plane perpendicular to the 1 st plane 111 and the 2 nd plane 112 (i.e., zx plane) includes an L-shape. The sectional shape of the bent portion 221 includes an L-shape, and thus a sufficient elastic force can be exerted. The 2 nd support body 220 may have a plurality of bent portions 221.

The bent portion 221 is a portion having a bent shape in the 2 nd support body 220. The curved shape includes both a bent shape having no radius of curvature and a shape curved at a predetermined radius of curvature.

As shown in fig. 3A, in the case where a plurality of bent portions 221 having a cut surface shape including an L shape are provided, the 2 nd support body 220 may have a folded shape. In this case, the 2 nd support body 220 has a corrugated shape by forming a shape in which the convex folding shape and the concave folding shape are repeated in the folded shape.

By providing the bent portion 221 in the 2 nd support body portion 220 in this manner, an elastic force can be applied to the power generation element 110 in a direction perpendicular to the 2 nd plane 112 (i.e., in the stacking direction). In the present embodiment, the 2 nd support body 220 has the parallel surface portion 222, and the parallel surface portion 222 is in contact with the 2 nd plane 112, so that the bending portion 221 can give the elastic force to the 2 nd plane 112.

Here, a battery 1000x according to a comparative example will be described with reference to fig. 3B.

The battery 1000x according to the comparative example includes the power generating element 110x and does not include a support. The power generating element 110x has the same configuration as the power generating element 110 according to the present embodiment. The power generation element 110x has a 1 st plane 111x, a 2 nd plane 112x, and a 3 rd plane 113 x. The battery 1000x is housed in the case 400, and is supported in contact with the upper surface portion 401 and the bottom surface portion 402.

In the battery 1000x, if the power generation element 110x swells, it deforms so as to extend in the z-axis positive direction and the z-axis negative direction. As a result, the power generating element 110x is pressed back from the upper surface portion 401 and the bottom surface portion 402, that is, the pressure with which the upper surface portion 401 and the bottom surface portion 402 support the power generating element 110x increases, and therefore peeling and cracks in the power generating element 110x more easily occur. That is, the battery 1000x according to the comparative example has low reliability.

The battery 1000 according to the present embodiment will be described with reference to fig. 3A again.

As described above, the stress caused by the expansion of the power generation element 110 is mainly generated in the direction of lamination. The bending portion 221 can similarly apply an elastic force in the stacking direction. By providing such a bent portion, even if expansion of the power generation element 110 occurs, the pressure for supporting the power generation element 110 is less likely to increase, and therefore, peeling and cracking in the power generation element 110 can be suppressed.

That is, by providing the support body 200, it is possible to easily support the power generation element 110, and to suppress the occurrence of peeling and cracks in the power generation element 110. This makes it possible to obtain battery 1000 with high reliability.

As described above, the power generating element 110 has a plurality of battery cells 101 stacked thereon.

By stacking a plurality of battery cells 101 in this manner, the voltage or capacity of battery 1000 can be increased. On the other hand, in the battery 1000 including a plurality of battery cells 101, the thickness of the power generating element 110 is increased as compared with a battery including 1 battery cell 101. Therefore, the risk of being affected by deformation such as warpage due to stress generation in the power generation element 110 increases. Therefore, in such a battery 1000, a technique for improving reliability is more important.

The support 200 may protrude from the 2 nd plane 112 in a direction perpendicular to the 2 nd plane 112 (in the present embodiment, in the negative z-axis direction). More specifically, the distance d3 by which the support body 200 protrudes from the 2 nd plane 112 may be 1mm or more and 10mm or less. In other words, the protruding distance d3 is the distance between the power generation element 110 and the support surface (the bottom surface 402 of the case).

By setting the projecting distance d3 to 1mm or more, a sufficient space is created around the power generating element 110 (specifically, between the power generating element 110 and the support surface). Therefore, even if the power generation element 110 expands, the 2 nd plane 112 of the power generation element 110 does not come into contact with the surrounding object (specifically, the support surface), and the 2 nd plane 112 does not receive a pressure from the surrounding object (specifically, the support surface). This can suppress the occurrence of separation and cracks in the power generation element 110.

By setting the projecting distance d3 to 10mm or less, unnecessary space around the power generation element 110 (specifically, between the power generation element 110 and the support surface) can be reduced, and therefore, the battery 1000 can be prevented from being increased in size.

As a material constituting the support 200, for example, a metal or a resin can be used, but not particularly limited. For example, aluminum, stainless steel, titanium, nickel, copper, magnesium, or an alloy thereof can be used as the metal. For example, as the resin constituting the support 200, epoxy resin, polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylic acid, acrylonitrile, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyurethane, polyphenylene sulfide, polysulfone, polyethersulfone, polyarylate, polyetheretherketone, polyetherimide, polytetrafluoroethylene, perfluoroalkoxyalkane, polychlorotrifluoroethylene, polyvinylidene fluoride, or the like can be used.

The support 200 may be formed of a plate member having a thickness d1 of 50 μm or more and 5000 μm or less. Thus, when the thickness d1 is 50 μm or more, the mechanical strength of the support 200 is improved. When the thickness d1 is 5000 μm or less, the bent portion 221 is easily formed in the support 200.

The support body 200 may be an electrode terminal. The electrode terminals play a role of power supply. In this case, the support 200 is connected to one of the positive electrode layer and the negative electrode layer. In the present embodiment, the 2 nd support body portion 220 of the support 200 is connected to the negative electrode current collector 106 included in the negative electrode layer exposed on the 2 nd plane 112. In the case where the support 200 is an electrode terminal, the support 200 may be made of the above-described metal. In this case, a bonding layer that impedes electrical conduction is not provided between the support 200 and the power generating element 110.

In this way, the support body 200 supports the power generating element 110 and is electrically connected to the power generating element 110, and thus additional electrodes and the like are not required. Therefore, the battery can be prevented from being enlarged.

In addition, in the case where the support body 200 is composed of metal, the surface of the support body 200 may be covered with resin. For example, the surface of the support 200 may be coated with a resin. The flexibility of the resin enhances impact resistance against deformation of the power generating element, and thus the adhesion between the 1 st plane 111 and the 1 st support body 210 is improved, and the support is facilitated. That is, high reliability can be imparted to the battery 1000.

Examples of the resin in this case include polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, polyimide, polyamideimide, polyacrylonitrile, polyacrylic acid, polymethyl acrylate, polyethyl acrylate, polyhexamethylene acrylate, polymethacrylic acid, polymethyl methacrylate, polyethyl methacrylate, polyhexamethylene methacrylate, polyvinyl acetate, polyvinylpyrrolidone, polyether sulfone, hexafluoropropylene, styrene-butadiene rubber, and an organic polymer such as carboxymethyl cellulose. Alternatively, various rubbers such as silicone rubber, chloroprene rubber, nitrile rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, urethane rubber, fluorine rubber, polysulfide rubber, natural rubber, isoprene rubber, styrene-butadiene rubber, butyl rubber, and butadiene rubber can be used.

Further, the portion of the electrode terminal where the support 200 is connected to the power generating element 110 may be made of, for example, a conductive polymer. By the resin covering the support 200 exhibiting a function as a current collector, improvement in rate characteristics can be expected. As the conductive polymer, polyacetylene, polyaniline, polypyrrole, polythiophene, or the like can be used.

A resin conductive paste, for example, can be used at the portion where the support 200 serving as the electrode terminal is connected to the power generating element 110. The resin covering the support 200 has conductivity, and the flexibility of the resin improves the impact resistance, thereby ensuring high reliability of the battery 1000.

Alternatively, the support 200 serving as the electrode terminal and the power generating element 110 may be connected by solder. Since all of the support 200, the solder, and the power generating element 110 are connected by the metal components, the wiring resistance is greatly reduced, and high-rate characteristics can be expected. By making the solder function as a current collector, the current collector can be eliminated or made thin, and the thickness of the power generating element 110 can be reduced. The energy density of the power generating element 110 can be increased by reducing the thickness of the power generating element 110.

In addition, no material having no conductivity may be provided in the bonding layer at the portion where the support 200 serving as the electrode terminal is connected to the power generating element 110.

However, when the support 200 is an electrode terminal, the following problems may occur.

As described above, the power generation element 110 expands so as to extend in the z-axis positive direction and the z-axis negative direction with charge and discharge. As a result, deformation such as warpage occurs in the 2 nd plane 112 electrically connected to the support 200 serving as the electrode terminal. This causes a poor connection between the power generating element 110 and the electrode terminal (support 200), which causes current concentration, resulting in a significant decrease in battery characteristics.

However, by providing the bent portion 221, the pressure applied to the electrode terminal (support body 200) due to deformation such as warpage of the power generation element 110 is relaxed. Therefore, the influence of the connection failure is reduced. Therefore, the battery 1000 in which current concentration is less likely to occur in the power generating element 110 can be realized. That is, the battery 1000 with high reliability can be realized.

When the support 200 is an electrode terminal, the distance d3 by which the support 200 protrudes from the 2 nd plane 112 may be 1mm or more and 10mm or less.

By setting the projecting distance d3 to 1mm or more in this way, stress applied to the electrode terminal (support body 200) generated when the power generation element 110 is deformed (for example, deformed by warping or the like) can be relaxed, and a higher effect can be obtained in suppressing a connection failure.

Further, by setting the projecting distance d3 to 10mm or less, the size of the electrode terminal is not easily increased, and the increase in wiring resistance can be sufficiently suppressed, thereby improving the battery characteristics.

In the present embodiment, the 2 nd support body portion 220 is connected to the negative electrode current collector 106, but is not limited thereto. For example, the 1 st support body portion 210 may be connected to one of the positive electrode layer and the negative electrode layer. In this case, the positive electrode layer or a member electrically connected to the positive electrode layer may be exposed on the 1 st plane 111, and the positive electrode layer or the member electrically connected to the positive electrode layer may be connected to the 1 st support body 210 serving as an electrode terminal. In this case, the insulating portion 120 may not be provided.

In this case, the 1 st support body 210 may be in contact with the entire surface of the 1 st plane 111.

In this way, the contact area between the 1 st support body 210 as the electrode terminal and the power generating element 110 is increased, and thus an increase in resistance due to a connection failure can be prevented.

Next, a modified example of the embodiment will be described. In the embodiment, the 2 nd supporting body part 220 is exemplified to have the parallel surface part 222 and the plurality of bent parts 221 in the L-shape. But is not limited thereto. The shape of the 2 nd support body portion of modification 1 to modification 6 shown below is different from the shape of the 2 nd support body portion 220 of the embodiment. Batteries of modification 1 to modification 6 will be described with reference to fig. 4A and 4B.

Fig. 4A is a side view of the periphery of the 2 nd support body portion of the battery according to modifications 1 to 3 of the present embodiment. Fig. 4B is a side view of the periphery of the 2 nd support body portion of the battery according to modifications 4 to 6 of the present embodiment. Fig. 4A and 4B are side views of a battery according to a modification corresponding to the region IV of the battery 1000 according to the present embodiment shown in fig. 3A.

In the modification, the components common to the embodiment are not described in detail.

(modification 1)

Fig. 4A (a) is a diagram showing the periphery of a support 200a provided in a battery 1000a according to modification 1. The supporter 200a has a 1 st support body 210 and a 2 nd support body 220a including a bent portion 221 a. In this modification, the shape of the cross section of the bent portion 221a cut along a plane perpendicular to the 1 st plane 111 and the 2 nd plane 112 (i.e., zx plane) includes a V-shape. As shown in fig. 4 (a), the tip portion of the V shape may not be a sharp shape but an arc shape.

The cross-sectional shape of the bent portion 221a includes a V-shape, and thus a sufficient elastic force can be exerted. Therefore, the occurrence of peeling or cracks in the power generation element 110 can be suppressed.

(modification 2)

Fig. 4A (b) is a diagram showing the periphery of the support 200b provided in the battery 1000b of modification 2. The supporter 200b has a 1 st support body 210 and a 2 nd support body 220b including 2 bent portions 221 b. In this modification, the shape of the cross section of the bent portion 221b cut along a plane perpendicular to the 1 st plane 111 or the 2 nd plane 112 (i.e., zx plane) includes an L-shape.

Even when 2 bending portions 221b are provided, the bending portions 221b can exert a sufficient elastic force. Therefore, the occurrence of peeling or cracks in the power generation element 110 can be suppressed.

(modification 3)

Fig. 4A (c) is a diagram showing the periphery of a support 200c provided in the battery 1000c of modification 3. The supporter 200c has a 1 st support body 210 and a 2 nd support body 220c including a bent portion 221 c. In this modification, the cut surface shape of the bent portion 221c cut along a plane perpendicular to the 1 st plane 111 and the 2 nd plane 112 (i.e., zx plane) includes a U-shape. As shown in (c) of fig. 4A, the 2 nd support body 220c may have a folded shape.

The bending portion 221c can exert a sufficient elastic force by including a U-shape in the cross-sectional shape. Therefore, the occurrence of peeling or cracks in the power generation element 110 can be suppressed.

(modification 4)

Fig. 4B (a) is a diagram showing the periphery of the support 200 provided in the battery 1000d according to modification 4. The supporter 200 has a 1 st support body 210 and a 2 nd support body 220 including a bent portion 221. In addition, the 2 nd support body 220 may include a parallel face portion 222.

In the embodiment, the 2 nd support body 220 (more specifically, the parallel face portion 222) exemplifies the contact with the 2 nd plane 112. In the present modification, the 2 nd support body 220 is spaced apart from the 2 nd plane 112. More specifically, the 2 nd support body 220 includes a parallel surface portion 222 isolated from the 2 nd plane 112. An isolation space 230 is provided between the parallel face portion 222 and the 2 nd plane 112.

Therefore, even if the power generation element 110 expands, the 2 nd plane 112 of the power generation element 110 does not contact the 2 nd support body 220, and the 2 nd plane 112 does not receive a pressure from the 2 nd support body 220. This can suppress the occurrence of separation or cracks in the power generation element 110.

That is, by providing such a support 200, it is possible to easily support the power generation element 110 and to suppress the occurrence of peeling or cracks in the power generation element 110.

(modification 5)

Fig. 4B (B) is a diagram showing the periphery of the support 200 included in the battery 1000e of modification 5. The supporter 200 has a 1 st support body 210 and a 2 nd support body 220 including a bent portion 221. In addition, the 2 nd support body 220 may include a parallel face portion 222. The battery 1000e according to the present modification further includes a resin member 240 positioned between the 2 nd support body 220 and the 2 nd plane 112. More specifically, the resin member 240 is positioned between the parallel surface portion 222 included in the 2 nd support body portion 220 and the 2 nd plane 112, and contacts the parallel surface portion 222 included in the 2 nd support body portion 220 and the 2 nd plane 112. Thereby, the 2 nd support body 220 supports the power generating element 110 via the resin member 240.

The shape of the resin member 240 is a rectangular parallelepiped shape, but is not particularly limited as long as the resin member 240 can be positioned between and in contact with the 2 nd plane 112 and the parallel surface portion 222 included in the 2 nd support body portion 220.

The resin member 240 is made of a resin material. The resin material is not particularly limited, and for example, the material used for the support body 200 can be used. In addition, an elastomer material may be used as the resin material. The elastomer material is a material having elasticity, and examples thereof include, but are not limited to, thermosetting elastomers and thermoplastic elastomers.

The support body 200 can support the power generating element 110 more easily by supporting the 2 nd plane 112 via the resin member 240 by the 2 nd support body portion 220 in addition to the 1 st plane 111 by the 1 st support body portion 210.

In addition, a case where the resin member 240 is made of an elastomer material will be described. Since the resin member 240 provides elasticity between the 2 nd plane 112 and the 2 nd support body portion 220, even if the power generation element 110 expands, the pressure for supporting the power generation element 110 is less likely to increase, and peeling or cracking in the power generation element 110 can be suppressed.

(modification 6)

Fig. 4B (c) is a diagram showing the periphery of the support 200f provided in the battery 1000f of modification 6. The supporter 200f has a 1 st support body 210 and a 2 nd support body 220f including a bent portion 221. In addition, the 2 nd support body 220 may include a parallel face portion 222.

In this modification, the support 200f protrudes from the 1 st plane 111 in the direction opposite to the power generating element 110. The projecting distance d4 is, for example, 0.1mm to 10 mm. The direction from the 1 st plane 111 to the opposite side of the power generating element 110 is the negative x-axis direction.

As described above, the power generating element 110 is deformed so as to extend mainly in the stacking direction, i.e., the positive z-axis direction and the negative z-axis direction. However, the power generating element 110 is also deformed to extend in a direction perpendicular to the stacking direction, for example, in the positive x-axis direction and the negative x-axis direction. Therefore, by setting the projecting distance d4 to 0.1mm or more, even if the power generation element 110 is deformed so as to extend in the direction perpendicular to the stacking direction, the power generation element 110 can allow the deformation in the perpendicular direction. Therefore, the deformation of the power generation element 110 is alleviated, and the reliability of the battery 1000f is improved.

In addition, by further reducing the projecting distance d4, the battery 1000f can be mounted in a smaller area. Therefore, by setting the projecting distance d4 to 10mm or less, the battery 1000f can be prevented from being increased in size.

Here, a modification 7 of the embodiment will be described with reference to fig. 5.

Fig. 5 is a side view of the battery 1000g according to the present modification when it is housed in the case 400.

The battery 1000g according to the present modification includes the power generating element 110, the 1 st support, and the 2 nd support 300. In the present modification, the configuration of the 1 st support is the same as that of the support 200 described above, and therefore, the 1 st support is hereinafter referred to as the 1 st support 200.

The 2 nd support 300 is a member that supports the power generating element 110. The 2 nd supporter 300 has a 1 st supporter body 310 and a 2 nd supporter body 320.

The structure of the 1 st support body 310 of the 2 nd supporter 300 is the same as that of the 1 st support body 210 of the 1 st supporter 200, and is different from the 1 st support body 210 only in that the 1 st support body 310 is in contact with the 3 rd plane 113. That is, the 1 st supporter 200 and the 2 nd supporter 300 support opposite surfaces of the power generating element 110, respectively.

The structure of the 2 nd supporting body 320 of the 2 nd supporting body 300 is the same as that of the 2 nd supporting body 220 of the 1 st supporting body 200. Specifically, the 2 nd support body 320 includes a curved portion 321 and a parallel surface portion 322.

The 1 st support 200 and the 2 nd support 300 can more easily support the power generation element 110 by supporting the 1 st plane 111, the 2 nd plane 112, and the 3 rd plane by the 1 st support 200 and the 2 nd support 300.

(other embodiments)

The battery according to the present disclosure has been described above based on the embodiments and the modifications, but the present disclosure is not limited to these embodiments and modifications. A configuration obtained by applying various modifications that can be conceived by a person skilled in the art to the embodiment and other configurations constructed by combining some of the constituent elements in the embodiment and the modifications are included in the scope of the present disclosure, as long as the present disclosure does not depart from the gist of the present disclosure.

In modification 7, the 1 st support 200 and the 2 nd support 300 support the opposite surfaces of the power generating element 110, respectively, but are not limited thereto. For example, the battery may have 3 or more supports. In addition, the planar shape of the power generating element (i.e., the shape when the power generating element is viewed in the negative z-axis direction) may be a rectangle. The 3 or more support bodies may support each side or corner of a rectangular shape in a plan view of the power generating element.

In the embodiment and the modifications, the battery includes 1 power generation element, but is not limited thereto. For example, the battery may be provided with a plurality of power generation elements. In this case, for example, another power generation element different from the power generation element 110 may be provided on the z-axis positive side of the power generation element 110 of the embodiment. In addition, a support body may be provided between the power generation element 110 and another power generation element.

In the embodiment and the modifications, the 2 nd support body 220 is provided between the power generating element 110 and the bottom surface portion 402 of the case 400, but the invention is not limited thereto. For example, the 2 nd support body 220 may be provided between the power generation element 110 and the upper surface portion 401 of the case 400.

As shown in fig. 2, the power generation element 110 is a tandem-type battery cell having a structure in which the negative electrode current collector 106 and the positive electrode current collector 105 of the battery cells 101 adjacent to each other in the stacking direction are stacked so as to be connected to each other, but is not limited thereto. The power generating element may be a parallel type laminated battery having a structure in which the same-electrode collectors of the batteries adjacent in the lamination direction are connected to each other. In addition, a tandem type stacked battery may be a stacked battery in which collectors of the same electrodes are connected to each other and in which series and parallel are combined.

For example, in the above embodiment, the power generation element 110 is a series-type power generation element having a structure in which the electrode current collectors of the battery cells 101 adjacent to each other in the stacking direction are stacked so as to be connected to the counter electrode current collector, but the invention is not limited thereto. The power generating element may be a parallel type power generating element having a structure in which the same-electrode collectors of the cells adjacent in the stacking direction are connected to each other. In addition, the series-type power generating element may be a power generating element in which collectors of the same electrodes are connected to each other and which is a combination of series connection and parallel connection.

The above-described embodiments may be variously modified, replaced, added, omitted, and the like within the scope of the claims or the equivalent thereof.

Industrial applicability

The battery of the present disclosure can be used, for example, as a lithium ion secondary battery (e.g., an all-solid battery) or the like.

Description of the reference numerals

101 battery unit

102 positive electrode

103 negative electrode

104 solid electrolyte layer

105 positive electrode collector

106 negative electrode current collector

110. 110x power generation element

111. 111x 1 st plane

112. 112x 2 nd plane

113. 113x No. 3 plane

120 insulating part

200 support and 1 st support

200a, 200b, 200c, 200f support

210 st support body

220. 220a, 220b, 220c, 220f No. 2 support body part

221. 221a, 221b, 221c bend

222 parallel face

230 isolated space

240 resin part

300 nd 2 support

310 st support body

320 nd 2 support body

Curved portion 321

322 parallel face

400 casing

401 upper surface part

402 bottom surface

d1 thickness

d2 length

d3 protrusion distance

d4 protrusion distance

Direction of P stress generation

1000. 1000a, 1000b, 1000c, 1000d, 1000e, 1000f, 1000g, 1000x cell.