Battery

Abstract

The utility model relates to a battery which is provided with an electrode body and a laminated outer packaging body covering the electrode body. The battery has a resin member that is disposed on the outside of the laminated exterior body, covers all surfaces of the laminated exterior body, and contains a polyurea resin. The resin member has a fragile portion. As a result, the gas generated by the electrode body can be appropriately discharged to the outside of the battery.

Description

Technical Field

[0001] The utility model relates to a battery. Background Art

[0002] Batteries such as lithium-ion secondary batteries usually have an electrode body, which has a positive electrode collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode collector. The electrode body is, for example, sealed in an internal space surrounded by an outer packaging material. Patent document 1 discloses a stacked secondary battery having a stacked electrode body, a soft stacked outer packaging body, and a hard stacked outer packaging body.

[0003] Patent document 1: Japanese Patent Publication No. 2020-170583.

[0004] Since battery performance deteriorates due to overcharging, the voltage is usually controlled in a way that does not cause overcharging. In addition, measures are required in the event of accidental overcharging. If a battery is overcharged, gas is generated from the electrode body. It is required to appropriately release the gas to the outside of the battery. Utility Model Content

[0005] The present invention is completed in view of the above-mentioned actual situation, and its main purpose is to provide a battery capable of appropriately releasing the gas generated by the electrode body to the outside of the battery.

[0006] The first embodiment of the utility model is a battery having an electrode body and a laminated outer casing covering the electrode body, wherein the battery has a resin component, the resin component is arranged on the outside of the laminated outer casing, covers all surfaces of the laminated outer casing and contains a polyurea resin, and the resin component has a fragile portion.

[0007] A second aspect of the utility model is a battery comprising an electrode body and a laminated outer casing covering the electrode body, wherein the battery comprises a resin component, wherein the resin component is arranged between the electrode body and the laminated outer casing, covers all surfaces of the electrode body and contains a polyurea resin, and wherein the resin component has a fragile portion.

[0008] A third aspect of the present invention is that, in the first aspect or the second aspect, the fragile portion is a thin-walled portion, a through portion, or a slit portion, and is disposed on a main surface of the electrode body.

[0009] The fourth mode of the utility model is that in any one of the first to third modes, the electrode body has a positive electrode active material layer, a negative electrode active material layer and an electrolyte layer arranged between the positive electrode active material layer and the negative electrode active material layer, and the electrolyte layer is a solid electrolyte layer containing a solid electrolyte.

[0010] A fifth aspect of the present invention is, in the fourth aspect, wherein the solid electrolyte is a sulfide solid electrolyte.

[0011] The battery of the present invention has the effect of being able to appropriately release the gas generated from the electrode body to the outside of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1A Schematic diagram of a top view of a battery in the present invention. Figure 1B and Figure 1C It is a cross-sectional schematic diagram illustrating a battery in the present invention.

[0013] Figure 2A Schematic diagram of a top view of a battery in the present invention. Figure 2B and Figure 2C It is a cross-sectional schematic diagram illustrating a battery in the present invention.

[0014] Figure 3 It is a three-dimensional schematic diagram illustrating the electrode body in the present invention.

[0015] Figure 4A , Figure 4B and Figure 4C It is a cross-sectional schematic diagram illustrating the fragile portion in the present invention.

[0016] Figure 5A and Figure 5B It is a schematic cross-sectional view illustrating an electrode body in the present invention. DETAILED DESCRIPTION

[0017] The battery in the utility model is described in detail below using the accompanying drawings. The figures shown below are schematically represented, and the size and shape of each part are appropriately exaggerated for easy understanding. In addition, in this specification, when expressing the way of configuring other components relative to a certain component, if it is only expressed as "above" or "below", unless otherwise specified, it includes the two situations of configuring other components directly above or below in a manner connected to a certain component and configuring other components above or below a certain component via another component.

[0018] Figure 1A Schematic diagram of a top view of a battery in the present invention. Figure 1B for Figure 1A AA cross-section diagram, Figure 1C For the general Figure 1B A magnified image of a portion of the image. Figure 1A , Figure 1B , Figure 1CThe battery 100 shown has an electrode body 10, a laminated outer body 20 covering the electrode body 10, and a terminal 30 electrically connected to the electrode body 10. The battery 100 has a resin member 40 disposed outside the laminated outer body 20. The resin member 40 covers all surfaces of the laminated outer body 20 and contains a polyurea resin. In addition, the resin member 40 has a fragile portion 41.

[0019] Figure 2A Schematic diagram of a top view of a battery in the present invention. Figure 2B for Figure 2A AA cross-section diagram, Figure 2C For the general Figure 2B A magnified image of a portion of the Figure 1A , Figure 1B , Figure 1C In the embodiment, the resin component 40 is arranged on the outside of the laminated outer body 20. In contrast, the resin component may be arranged on the inside of the laminated outer body. Specifically, Figure 2A , Figure 2B , Figure 2C The battery 100 shown has a resin member 40 disposed between the electrode assembly 10 and the laminated outer casing 20 . The resin member 40 covers all surfaces of the laminated outer casing 20 and contains a polyurea resin. The resin member 40 has a fragile portion 41 .

[0020] According to the utility model, by arranging a resin member containing polyurea resin and having a fragile portion 41 on the outside or inside of the laminated outer body, the gas generated by the electrode body can be appropriately released to the outside of the battery. As described above, if the battery is overcharged, the electrode body generates gas. It is required to appropriately release the gas to the outside of the battery.

[0021] In the utility model, a resin component containing a polyurea resin is arranged on the outside or inside of the laminated outer body in a manner that surrounds the entire electrode body. Polyurea resin has excellent properties such as high elongation, high elasticity, high strength, and high adhesion. Therefore, when the electrode body generates gas, the resin component also expands, and the generated gas can be temporarily stored inside the resin component. This prevents the generated gas from immediately reacting with oxygen in the atmosphere. In addition, since the resin component has a fragile portion, when the internal pressure of the resin component rises, the gas can be released through the fragile portion. In addition, polyurea resin has the advantages of high chemical resistance, corrosion resistance, flame retardancy, water resistance, heat resistance, and wear resistance. In addition, when making a resin component containing a polyurea resin, for example, a spraying process is used. In this case, it has the advantages of easy large-area coating, curing in about a few minutes, and good operability.

[0022] The battery structure of the present invention includes at least an electrode body, a laminated outer casing, and a resin member.

[0023] The electrode body in the present invention functions as a power generation element of the battery. The shape of the electrode body is not particularly limited, for example Figure 3 As shown, it has: a first surface S1; a second surface S2, which is opposite to the first surface S1; and a plurality of third surfaces S3, which are equivalent to the side surfaces connecting the first surface S1 and the second surface S2. In addition, for convenience, Figure 3 The description of the tabs for connecting to the terminals is omitted. The first surface S1 and the second surface S2 both correspond to the main surfaces of the electrode body, and the normal direction of the main surfaces is defined as the thickness direction (z direction).

[0024] The plan view shape of the first surface is not particularly limited, and examples thereof include quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram. Figure 3 The top view shape of the first surface S1 in the embodiment is a rectangle. The shape of the first surface may be a polygon other than a quadrilateral, or a shape having a curve such as a circle. In addition, the top view shape of the second surface is the same as the shape of the first surface. The top view shape of the third surface is not particularly limited, and for example, a quadrilateral such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram can be listed.

[0025] The resin component in the present invention is arranged outside or inside the laminated outer package. Hereinafter, the form in which the resin component is arranged outside the laminated outer package (first form) and the form in which the resin component is arranged inside the laminated outer package (second form) will be described.

[0026] First, the first form will be described.

[0027] like Figure 1A , Figure 1B , Figure 1C As shown, the resin component 40 can be arranged outside the laminated outer casing 20. "Outside the laminated outer casing" refers to the side opposite to the electrode body based on the laminated outer casing. By arranging the resin component outside the laminated outer casing, the resin component can be formed without changing the size of the existing electrode body and the size of the laminated outer casing. In addition, the resin component covers all surfaces of the laminated outer casing. Figure 3 As shown, when the electrode body 10 has a first face S1, a second face S2 opposite to the first face S1, and a plurality of third faces S3 corresponding to the side surfaces connecting the first face S1 and the second face S2, the stacked outer casing is usually configured in a manner to cover all of these faces, and the resin component is configured in a manner to cover all of the faces of the stacked outer casing. In the case where the fragile portion is a through portion described later, strictly speaking, the resin component covers all of the faces of the stacked outer casing except for the portion corresponding to the fragile portion (through portion). In the present utility model, "the resin component covers all of the faces of the stacked outer casing" also includes the case where the resin component covers all of the faces of the stacked outer casing except for the portion corresponding to the fragile portion (through portion).

[0028] In the first form, the resin component has a fragile portion. The fragile portion is a portion through which the gas preferentially passes when the gas is generated in the electrode body. Figure 4A As shown, the fragile portion 41 may be a thin-walled portion. The thickness of the resin component 40 at the periphery of the fragile portion 41 is set to Tx, and the thickness of the fragile portion 41 (thin-walled portion) is set to Ty. The ratio of Ty to Tx (Ty / Tx) is not particularly limited, and is, for example, greater than 0.1 and less than 0.9, or may be greater than 0.3 and less than 0.6. In addition, when the width of the fragile portion 41 (thin-walled portion) is set to W1, W1 is not particularly limited, and is, for example, greater than 1 mm and less than 3 cm. As the top view shape of the thin-walled portion, for example, a circle, an ellipse, and a quadrilateral can be listed.

[0029] like Figure 4B As shown in FIG. 1 , the fragile portion 41 may also be a through portion. When the width of the fragile portion 41 (through portion) is set to W2, W2 is not particularly limited, and is, for example, 1 mm or more and 1 cm or less. Examples of the top view shape of the through portion include a circle, an ellipse, and a quadrilateral. Figure 4C As shown, the fragile portion 41 may also be a slit portion.

[0030] like Figure 1A and Figure 2A As shown, the fragile portion 41 is preferably arranged on the main surface of the electrode body 10. This is because the fragile portion 41 is easy to form. In addition, the method for forming the fragile portion is not particularly limited. In the case where the fragile portion is a thin-walled portion, the thin-walled portion is formed, for example, by masking the position where the fragile portion is formed in the spraying process. In addition, in the case where the fragile portion is a through portion, the through portion is formed, for example, by masking the position where the fragile portion is formed before the spraying process. In addition, in the case where the fragile portion is a slit portion, the slit portion is formed, for example, by forming a cut on the resin component after the spraying process.

[0031] In the first form, the average thickness of the resin part is not particularly limited, for example, it is greater than 0.3 mm and less than 2.0 mm. If the average thickness of the resin part is too small, the generated gas cannot be temporarily stored inside the resin part, and the generated gas may react immediately with the oxygen in the atmosphere. On the other hand, if the average thickness of the resin part is too large and the structural strength of the resin part is too high, it is difficult to properly release the gas generated by the electrode body to the outside of the battery. The average thickness of the resin part can be greater than 0.5 mm, and can also be greater than 0.7 mm. On the other hand, the average thickness of the resin part can be less than 1.5 mm.

[0032] The average thickness of the resin component is calculated by the following method. That is, the thickness of the resin component covering the first surface of the electrode body is set to T1, the thickness of the resin component covering the second surface of the electrode body is set to T2, and the thickness of the resin component covering the third surface of the electrode body is set to T3. Here, for the thickness T1, 10 measurement locations are selected without bias, and the thickness T1 of each measurement location is measured. Next, the maximum value, the second largest value, the minimum value, and the second smallest value are removed from the thickness T1 measured at the 10 points, and the average thickness T of the thickness T1 is calculated from the remaining 6 points. 1AVE The same operation is performed for thickness T2 and thickness T3 to find the average thickness T of thickness T2. 2AVE and the average thickness T of thickness T3 3AVE . 1AVE 、T 2AVE and T 3AVE The average value of is taken as the average thickness of the resin part.

[0033] In the first form, T is preferred 1AVE 、T 2AVE and T 3AVE They are 0.3 mm or more and 2.0 mm or less. 1AVE 、T 2AVE and T 3AVE They can be 0.5 mm or more, or 0.7 mm or more. 1AVE 、T 2AVE and T 3AVE They can be less than 1.5 mm respectively.

[0034] Next, the second form will be described.

[0035] like Figure 2A , Figure 2B , Figure 2C As shown, the resin component 40 may also be arranged on the inner side of the stacked outer package 20. Specifically, the resin component 40 may be arranged between the electrode body 10 and the stacked outer package 20. By arranging the resin component 40 between the electrode body 10 and the stacked outer package 20, the resin component 40 functions as a buffer component, and the reduction in the sealing performance of the stacked outer package can be suppressed. Specifically, if the volume of the electrode body 10 changes with charging and discharging, the stress applied from the electrode body 10 to the stacked outer package 20 also changes, so the sealing performance of the stacked outer package 20 is easily reduced. In contrast, by arranging the resin component 40 containing a polyurea resin between the electrode body 10 and the stacked outer package 20, the resin component 40 functions as a buffer component, and the volume change of the electrode body 10 with charging and discharging can be absorbed. Therefore, the reduction in the sealing performance of the stacked outer package 20 can be suppressed. In addition, the resin component 40 covers all surfaces of the electrode body 10. As Figure 3As shown, when the electrode body 10 has a first surface S1, a second surface S2 facing the first surface S1, and a plurality of third surfaces S3 corresponding to side surfaces connecting the first surface S1 and the second surface S2, the resin member is arranged to cover all of these surfaces.

[0036] In the second embodiment, the resin component has a fragile portion. The fragile portion in the second embodiment is the same as the fragile portion in the first embodiment. In addition, the average thickness, T 1AVE 、T 2AVE and T 3AVE , and the average thickness of the resin part in the first form, T 1AVE 、T 2AVE and T 3AVE same.

[0037] The laminated outer package in the present invention is configured to cover the electrode body. Figure 1B and Figure 2B As shown, the electrode body 10 is sealed by welding the stacked outer bodies 20 to each other to form a sealing portion α. ​​In addition, although not specifically shown, the sealing portion may be folded. By folding the sealing portion α, the sealing property is improved. Figure 1B and Figure 2B In the embodiment, two stacked outer casings 20 are used to seal the electrode body 10. On the other hand, although not particularly shown in the figure, the electrode body can also be sealed by bending one stacked outer casing. As a method for fusing the stacked outer casings to each other, for example, a method of fusing the stacked outer casings to each other by pressing a hot rod to the overlapped portions of the stacked outer casings can be cited.

[0038] The battery components are described below. The battery of the present invention includes at least an electrode body, a laminated outer package, and a resin member.

[0039] The resin component in the present invention contains a polyurea resin. The polyurea resin is a resin having a urea bond (-NH-CO-NH-). Examples of the polyurea resin include polyurea and polyurea polyurethane, of which polyurea is preferred. Polyurea is generally a resin that does not have a urethane bond (-NH-CO-O-), and has the advantage of being difficult to hydrolyze compared to polyurea polyurethane.

[0040] Polyurea is generally obtained by reacting polyisocyanate with polyamine. Among them, polyurea is preferably a resin using only polyisocyanate and polyamine as resin raw materials.

[0041] Polyisocyanate is a compound having two or more isocyanate groups in one molecule. Examples of polyisocyanate include diphenylmethane-4,4'-diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, and 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate.

[0042] Polyamines are compounds having two or more amino groups (primary or secondary) in one molecule. Examples of polyamines include: alkylamines such as ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, 1,2-butylenediamine, 1,5-pentanediamine, 1,6-hexanediamine, and dimerized diamine; aromatic amines such as o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 1,5-naphthalenediamine, 1,8-naphthalenediamine, o-phenylenediamine, m-phenylenediamine, and p-phenylenediamine; polyetheramines such as triethylene glycol diamine, trimethylolpropane poly(oxypropylene) triamine, and methoxy poly(oxyethylene / oxypropylene)-2-propylamine; and ethyleneamines such as diethylenetriamine, triethylenetetramine, and tetraethylenepentamine. The molecular weight of the polyamine is not particularly limited, and is, for example, 50 g / mol or more and 1000 g / mol or less.

[0043] When synthesizing polyurea, additives such as a chain extender, a crosslinking agent, and a catalyst may be used. Examples of the chain extender include amine-based chain extenders.

[0044] On the other hand, the polyurea polyurethane may be, for example, a resin obtained by polymerizing a polyisocyanate, a polyamine, and a polyol-based chain extender, or a resin obtained by polymerizing a polyisocyanate, a polyol, and an amine-based chain extender.

[0045] The glass transition temperature of the polyurea resin is not particularly limited, and is, for example, not less than -50°C and not more than 250°C. In addition, the resin component of the resin part preferably contains a polyurea resin as a main component, and more preferably contains only a polyurea resin. The elastic modulus of the resin part is not particularly limited, and is, for example, not less than 5 MPa and not more than 30 MPa, and may be not less than 8 MPa and not more than 15 MPa. In addition, the breaking strength of the resin part at 25°C is, for example, not less than 30 kN / m, and may be not less than 40 kN / m. On the other hand, the breaking strength of the resin part at 25°C is, for example, not more than 100 kN / m. In addition, the breaking strength of the resin part at -25°C is, for example, not less than 80 kN / m, and may be not less than 100 kN / m. On the other hand, the breaking strength of the resin part at -25°C is, for example, not more than 200 kN / m.

[0046] The electrode body in the present invention generally includes a positive electrode current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector in this order in the thickness direction. Figure 5A , Figure 5B The schematic cross-sectional view of the electrode body in the present invention is equivalent to Figure 3 Schematic diagram of the cross section of the electrode body in the xz plane.

[0047] Figure 5A The electrode body 10 shown has a negative electrode collector 1, a negative electrode active material layer 2, an electrolyte layer 3, a positive electrode active material layer 4, and a positive electrode collector 5 in order in the thickness direction (z direction). In addition, the negative electrode collector 1 has a negative electrode tab 1t for connecting to a negative electrode terminal (not shown), and the positive electrode collector 5 has a positive electrode tab 5t for connecting to a positive electrode terminal (not shown).

[0048] Figure 5B The electrode body 10 shown comprises: a negative electrode collector 1; a negative electrode active material layer 2x, an electrolyte layer 3x, a positive electrode active material layer 4x and a positive electrode collector 5x arranged in sequence in the thickness direction (z direction) starting from one side of the negative electrode collector 1; and a negative electrode active material layer 2y, an electrolyte layer 3y, a positive electrode active material layer 4y and a positive electrode collector 5y arranged in sequence in the thickness direction (z direction) starting from the other side of the negative electrode collector 1.

[0049] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer may further contain at least one of an electrolyte, a conductive material, and a binder. Examples of the positive electrode active material include oxide active materials. Examples of the oxide active material include LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2、LiNi 0.8 Co 0.15 Al 0.05 Layered rock salt type active materials such as O2, spinel type active materials such as LiMn2O4, olivine type active materials such as LiFePO4. In addition, sulfur (S) can also be used as the positive electrode active material. The shape of the positive electrode active material is, for example, a particle shape.

[0050] The electrolyte may be a solid electrolyte or a liquid electrolyte. The solid electrolyte may be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as a sulfide solid electrolyte or an oxide solid electrolyte. Among them, the solid electrolyte is preferably a sulfide solid electrolyte. This is because it has high ion conductivity.

[0051] The sulfide solid electrolyte usually contains at least Li and S. The sulfide solid electrolyte also preferably contains M element (M is at least one of P, As, Sb, Si, Ge, Sn, B, Al, Ga, and In). In addition, the sulfide solid electrolyte may contain halogen elements such as F, Cl, Br, and I.

[0052] The sulfide solid electrolyte can be a glassy (non-crystalline) sulfide solid electrolyte, a glass-ceramic sulfide solid electrolyte, or a crystalline sulfide solid electrolyte. The sulfide solid electrolyte can have a crystal phase. Examples of the crystal phase include Thio-LISICON type crystal phase, argyrodite type crystal phase, and LGPS type crystal phase.

[0053] The composition of the sulfide solid electrolyte is not particularly limited. For example, xLi2S·(1-x)P2S5 (0.5≦x<1), yLiI·zLiBr·(100-y-z)(xLi2S·(1-x)P2S5) (0.5≦x<1, 0≦y≦30, 0≦z≦30) can be cited. In these compositions, x preferably satisfies 0.7≦x≦0.8. In addition, as other examples of the composition of the sulfide solid electrolyte, Li 7-x-2y PS 6-x-y X y can be cited. X is at least one of F, Cl, Br, and I, and x and y satisfy 0≦x, 0≦y. In addition, as other examples of the composition of the sulfide solid electrolyte, Li 4-x M 1-x P x S4 (0<x<1) can be cited. M is at least one of Al, Zn, In, Ge, Si, Sn, Sb, Ga, and Bi.

[0054] On the other hand, the liquid electrolyte (electrolyte solution) contains, for example, a supporting salt such as LiPF6 and a solvent such as a carbonate-based solvent. In addition, as a conductive material, for example, a carbon material can be cited. In addition, as a binder, for example, a rubber-based binder or a fluoride-based binder can be cited.

[0055] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer may further contain at least one of an electrolyte, a conductive material, and a binder. As the negative electrode active material, for example, metal active materials such as Li, Si, and Sn, carbon active materials such as graphite, and oxide active materials such as Li4Ti5O 12 etc. can be cited.

[0056] The negative electrode active material is preferably a Si-based active material. This is because it can achieve a high capacity of the battery. Si-based active materials are active materials with Si as the main component. Si-based active materials can be Si monomers, Si alloys, or Si oxides. In addition, Si-based active materials can have a diamond-type crystal phase, a clathrate I type crystal phase, or a clathrate II type crystal phase. In the clathrate I or II type crystal phase, a polyhedron (cage-shaped) containing pentagons or hexagons is formed by multiple Si elements. Since the polyhedron has space inside that can contain metal ions such as Li ions, it can suppress the volume change caused by charging and discharging.

[0057] The shape of the negative electrode active material is, for example, particle or foil. The electrolyte, conductive material and binder are the same as those described above.

[0058] The electrolyte layer is disposed between the positive electrode active material layer and the negative electrode active material layer, and contains at least an electrolyte. The electrolyte may be a solid electrolyte or a liquid electrolyte. The electrolyte is the same as described above. The electrolyte layer may be a solid electrolyte layer containing a solid electrolyte. Furthermore, the solid electrolyte is preferably a sulfide solid electrolyte. In addition, generally, a battery having a solid electrolyte layer containing an inorganic solid electrolyte is referred to as a fully solid-state battery.

[0059] The positive electrode current collector collects current from the positive electrode active material layer. Examples of materials for the positive electrode current collector include metals such as aluminum, SUS, and nickel. Examples of shapes for the positive electrode current collector include foil and mesh. The positive electrode current collector generally has a positive electrode tab for connecting to a positive electrode terminal.

[0060] The negative electrode current collector collects current from the negative electrode active material layer. Examples of materials for the negative electrode current collector include metals such as copper, SUS, and nickel. Examples of shapes for the negative electrode current collector include foil and mesh. The negative electrode current collector generally has a negative electrode tab for connecting to a negative electrode terminal.

[0061] The laminated outer body in the present invention has a structure formed by laminating at least an inner resin layer and a metal layer. In addition, the laminated outer body may have an inner resin layer, a metal layer, and an outer resin layer in order along the thickness direction. As the material of the inner resin layer, for example, olefin resins such as polypropylene (PP) and polyethylene (PE) can be listed. As the material of the metal layer, for example, aluminum, aluminum alloy, and stainless steel can be listed. As the material of the outer resin layer, for example, polyethylene terephthalate (PET) and nylon can be listed. The thickness of the inner resin layer is, for example, greater than 40 μm and less than 100 μm. The thickness of the metal layer is, for example, greater than 30 μm and less than 60 μm. The thickness of the outer resin layer is, for example, greater than 20 μm and less than 60 μm. The thickness of the laminated outer body is, for example, greater than 80 μm and less than 250 μm.

[0062] like Figure 1A As shown, the battery 100 has terminals 30 (positive terminal 30 a, negative terminal 30 b) electrically connected to the electrode body 10. One end of the positive terminal 30 a is electrically connected to a positive electrode tab (not shown) in the electrode body 10 inside the laminated outer casing 20, and the other end of the positive terminal 30 a is exposed to the outside of the laminated outer casing 20.

[0063] Similarly, one end of the negative electrode terminal 30b is electrically connected to the negative electrode tab (not shown) in the electrode body 10 inside the laminated outer casing 20, and the other end of the negative electrode terminal 30b is exposed outside the laminated outer casing 20. Examples of the material of the terminal include metals such as SUS.

[0064] The battery in the utility model is typically a lithium-ion secondary battery. As the use of the battery, for example, the power supply of vehicles such as hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), electric vehicles (BEV), gasoline vehicles, and diesel vehicles can be listed. It is particularly preferably used as a driving power supply for hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV) or electric vehicles (BEV). In addition, the battery in the utility model can be used as a power supply for mobile bodies other than vehicles (such as rail vehicles, ships, and aircraft), and can also be used as a power supply for electrical products such as information processing devices.

[0065] The present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are illustrative, and any mode having substantially the same configuration as the technical concept described in the technical claims of the present invention and having the same function and effect is included in the technical scope of the present invention.

[0066] The following is a description of embodiments.

[0067] First, the first embodiment will be described.

[0068] An electrode body having a plurality of units in the thickness direction was produced, wherein the unit has a negative electrode current collector, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector in this order. As the negative electrode active material layer, a positive electrode active material (Li4Ti5O 12 ), binder (PVdF-based binder), sulfide solid electrolyte (Li2S-P2S5-based glass ceramic) and conductive material (VGCF). In addition, as the positive electrode active material layer, a layer containing a positive electrode active material (LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2), binder (PVdF-based binder), sulfide solid electrolyte (Li2S-P2S5-based glass ceramic) and conductive material (VGCF). In addition, as the solid electrolyte layer, a layer containing a sulfide solid electrolyte (Li2S-P2S5-based glass ceramic) and a binder (butadiene rubber) was used. In addition, Ni foil was used as the negative electrode collector and Al foil was used as the positive electrode collector.

[0069] The positive terminal and the negative terminal were mounted on the obtained electrode body and sealed with a laminated outer body (aluminum laminate). Next, polyurea was applied to all surfaces of the laminated outer body by a spraying process, and a resin member (thickness 0.5 mm) having a fragile portion (thin-walled portion with a thickness of 0.25 mm) was formed on the main surface of the electrode body (laminated outer body).

[0070] Next, the second embodiment will be described.

[0071] An electrode body was produced in the same manner as in the first embodiment. A positive electrode terminal and a negative electrode terminal were mounted on the produced electrode body, polyurea was applied to all surfaces of the electrode body by a spraying process, and a resin component (0.5 mm thick) having a fragile portion (0.25 mm thick thin-walled portion) was formed on the main surface of the electrode body. Thereafter, the electrode body covered with the resin component was sealed using a laminated outer body (aluminum laminate) to obtain a battery.

[0072] A first comparative example will be described. A battery was obtained in the same manner as in the first example except that no fragile portion was provided.

[0073] The batteries obtained in the first embodiment, the second embodiment, and the first comparative example were continuously charged at 5.5C at room temperature, and the battery status was confirmed. As a result, in the first comparative example, the battery swelled, smoked (generated white smoke), and then caught fire. In contrast, in the first and second embodiments, although the battery swelled and smoked, the smoke extinguished afterwards and no fire occurred. In this way, it was confirmed that by configuring a resin component containing a polyurea resin and having a fragile portion on the outside or inside of the laminated outer body, the gas generated by the electrode body can be appropriately released to the outside of the battery.

Claims

1. A battery comprising an electrode body and a laminated outer casing covering the electrode body, characterized in that: The battery comprises a resin member, the resin member being arranged outside the laminated outer casing, covering all surfaces of the laminated outer casing and containing a polyurea resin. The resin member has a fragile portion.

2. A battery comprising an electrode body and a laminated outer casing covering the electrode body, characterized in that: The battery comprises a resin member, the resin member being disposed between the electrode body and the laminated outer casing, covering all surfaces of the electrode body and containing a polyurea resin. The resin member has a fragile portion.

3. The battery according to claim 1 or 2, characterized in that: The fragile portion is a thin-walled portion, a through portion, or a slit portion, and is disposed on the main surface of the electrode body.

4. The battery according to claim 1 or 2, characterized in that: The electrode body includes a positive electrode active material layer, a negative electrode active material layer, and an electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer. The electrolyte layer is a solid electrolyte layer containing a solid electrolyte.

5. The battery according to claim 4, characterized in that The solid electrolyte is a sulfide solid electrolyte.

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