Battery

Abstract

In the present disclosure, provided is a battery having an electrode body and a laminated exterior body covering the electrode body, the battery having a resin member that is disposed on the outside of the laminated exterior body, covers the entire surface of the laminated exterior body, and contains a polyurea resin, the average thickness of the resin member being greater than 0.5 mm and less than 1.5 mm, and the average thickness of the resin member being greater than 0.5 mm and less than 1.5 mm. Therefore, the technical problem is solved.

Description

Technical Field

[0001] The present disclosure relates to batteries. Background Art

[0002] Batteries such as lithium-ion secondary batteries generally have an electrode body having 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 a packaging material. Japanese Patent Application Laid-Open No. 2020-170583 discloses a laminated secondary battery having a laminated electrode body, a soft laminated outer body, and a hard laminated outer body. Summary of the invention

[0003] Since battery performance is degraded by overcharging, the voltage is usually controlled in a way that does not cause overcharging. On the other hand, it is also necessary to take measures in the event of unexpected overcharging. When 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.

[0004] The present disclosure has been made in view of the above-mentioned actual situation, and a main object of the present disclosure is to provide a battery capable of appropriately releasing gas generated from an electrode body to the outside of the battery.

[0005] [1] A battery comprising an electrode body and a laminated outer casing covering the electrode body, wherein: The battery comprises a resin member, the resin member being arranged outside the laminated outer casing, covering the entire surface of the laminated outer casing, and containing a polyurea resin. The average thickness of the resin member is greater than 0.5 mm and less than 1.5 mm.

[0006] [2] A battery comprising an electrode body and a laminated outer casing covering the electrode body, wherein: The battery includes a resin member, the resin member being arranged between the electrode body and the laminated outer casing, covering the entire surface of the electrode body, and containing a polyurea resin. The average thickness of the resin member is greater than 0.5 mm and less than 1.5 mm.

[0007] [3] The battery according to [1] or [2], wherein The resin member has an average thickness of 0.7 mm or more and 1.3 mm or less.

[0008] [4] The battery according to any one of [1] to [3], wherein The electrode body comprises a positive electrode active material layer, a negative electrode active material layer and an electrolyte layer, wherein the electrolyte layer is arranged 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.

[0009] [5] The battery according to [4], wherein The solid electrolyte is a sulfide solid electrolyte. The battery of the present disclosure has an 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

[0010] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like components, and in which: Figure 1A are a schematic top view and a schematic cross-sectional view illustrating a battery in the present disclosure; Figure 1B are a schematic top view and a schematic cross-sectional view illustrating a battery in the present disclosure; Figure 2A are a schematic top view and a schematic cross-sectional view illustrating a battery in the present disclosure; Figure 2B are a schematic top view and a schematic cross-sectional view illustrating a battery in the present disclosure; Figure 3 is a schematic perspective view illustrating an electrode body in the present disclosure; Figure 4A is a schematic cross-sectional view illustrating a battery in the present disclosure; Figure 4B is a schematic cross-sectional view illustrating a battery in the present disclosure; Figure 5A is a schematic cross-sectional view illustrating an electrode body in the present disclosure; Figure 5B This is a schematic cross-sectional view illustrating an electrode body in the present disclosure. DETAILED DESCRIPTION

[0011] Hereinafter, the battery in the present disclosure will be described in detail 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 manner in which other components are configured relative to a certain component, it is expressed as follows. When simply expressed as "above" or "below", unless otherwise specified, it includes both the case where other components are configured directly above or below a certain component in a manner of contacting the certain component and the case where other components are configured above or below a certain component separated by other components.

[0012] Figure 1A is a schematic top view illustrating a battery in the present disclosure, Figure 1B yes Figure 1A AA section view. Figure 1A , Figure 1BThe 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 the entire surface of the laminated outer body 20 and contains a polyurea resin. In addition, in the present disclosure, the average thickness of the resin member 40 is within a specified range.

[0013] Figure 2A is a schematic top view illustrating a battery in the present disclosure, Figure 2B yes Figure 2A AA section view. Figure 1A , Figure 1B In the embodiment, the resin member 40 is arranged on the outside of the laminated outer body 20. In contrast, the resin member may be arranged on the inside of the laminated outer body. Specifically, Figure 2A , Figure 2B The battery 100 shown has a resin member 40 disposed between the electrode body 10 and the laminated outer casing 20. The resin member 40 covers the entire surface of the electrode body 10 and contains a polyurea resin. In the present disclosure, the average thickness of the resin member 40 is within a predetermined range.

[0014] According to the present disclosure, by disposing a resin member containing polyurea resin and having a predetermined average thickness on the outside or inside of the laminated outer body, the gas generated from the electrode body can be appropriately released to the outside of the battery. As described above, when the battery is overcharged, gas is generated from the electrode body. It is required to appropriately release the gas to the outside of the battery.

[0015] In the present disclosure, a resin member containing a polyurea resin is arranged on the outside or inside of the laminated outer body in a manner that includes the entire electrode body. Polyurea resin has excellent properties such as high elongation, high elasticity, high strength, and high adhesion. Therefore, when gas is generated from the electrode body, the resin member also expands, and the generated gas can be temporarily stored inside the resin member. Thus, it is possible to prevent the generated gas from reacting immediately with oxygen in the atmosphere. Furthermore, by appropriately adjusting the average thickness of the resin member, the resin member is prone to cracks as the internal pressure of the resin member rises, and gas can be released from the cracks. In addition, polyurea resin has the advantages of high chemical resistance, corrosion resistance, flame retardancy, water resistance, heat resistance, and wear resistance. Furthermore, when making a resin member containing a polyurea resin, for example, spray coating is used, but in this case, it has the advantages of being easy to apply to a large area and curing in about a few minutes, so the workability is good.

[0016] 1. Battery structure

[0017] The battery in the present disclosure has at least an electrode body, a laminated exterior body, and a resin member.

[0018] (1) Electrode body

[0019] The electrode body in the present disclosure 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 in FIG. 1 , the first surface S1, the second surface S2 opposite to the first surface S1, and a plurality of third surfaces S3 corresponding to the side surfaces connecting the first surface S1 and the second surface S2. 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).

[0020] 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 may be 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 examples thereof include quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram.

[0021] (2) Resin components

[0022] The resin member in the present disclosure is arranged outside or inside the laminated outer casing. Hereinafter, an embodiment (first embodiment) in which the resin member is arranged outside the laminated outer casing and an embodiment (second embodiment) in which the resin member is arranged inside the laminated outer casing will be described.

[0023] (i) First method

[0024] like Figure 1A , Figure 1B As shown, the resin member 40 can also be arranged on the outside of the laminated outer casing 20. "The outside of the laminated outer casing" refers to the side opposite to the electrode body based on the laminated outer casing. By arranging the resin member on the outside of the laminated outer casing, the resin member can be formed without changing the size of the electrode body and the size of the laminated outer casing. In addition, the resin member covers the entire surface of the laminated outer casing. As described above Figure 3 As shown, in a case where the electrode body 10 has a first surface S1, a second surface S2 opposite to 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 stacked outer packaging is usually configured in a manner covering their entire surfaces, and the resin member is configured in a manner covering the entire surface of the stacked outer packaging.

[0025] In the first embodiment, the average thickness of the resin member is greater than 0.5 mm and less than 1.5 mm. If the average thickness of the resin member is too small, the generated gas cannot be temporarily stored inside the resin member, and the generated gas may react immediately with the oxygen in the atmosphere. On the other hand, if the average thickness of the resin member is too large, the structural strength of the resin member becomes too high, and it is difficult to properly release the gas generated from the electrode body to the outside of the battery. The average thickness of the resin member can be more than 0.6 mm, or more than 0.7 mm, or more than 0.8 mm. On the other hand, the average thickness of the resin member can be less than 1.4 mm, or less than 1.3 mm, or less than 1.2 mm.

[0026] The average thickness of the resin member is calculated by the following method. Figure 4A As shown, the thickness of the resin member 40 covering the first surface S1 of the electrode body 10 is set to T1, the thickness of the resin member 40 covering the second surface S2 of the electrode body 10 is set to T2, and the thickness of the resin member 40 covering the third surface S3 of the electrode body 10 is set to T3. Here, regarding the thickness T1, 10 measurement locations are selected without preference, 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 excluded 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 obtain 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 of is set as the average thickness of the resin member.

[0027] In the first embodiment, T 1AVE 、T 2AVE and T 3AVE are greater than 0.5 mm and less than 1.5 mm respectively. In addition, T 1AVE 、T 2AVE and T 3AVE They can be 0.6 mm or more, 0.7 mm or more, or 0.8 mm or more. 1AVE 、T 2AVE and T 3AVE The diameter may be 1.4 mm or less, 1.3 mm or less, or 1.2 mm or less.

[0028] (ii) Second Method

[0029] like Figure 2A , Figure 2BAs shown, the resin member 40 may also be arranged on the inner side of the laminated outer casing 20. Specifically, the resin member 40 may also be arranged between the electrode body 10 and the laminated outer casing 20. By arranging the resin member 40 between the electrode body 10 and the laminated outer casing 20, the resin member 40 functions as a buffer member, and the reduction in the sealing of the laminated outer casing can be suppressed. Specifically, if the volume change of the electrode body 10 occurs with charging and discharging, the stress applied from the electrode body 10 to the laminated outer casing 20 also changes, so the sealing of the laminated outer casing 20 is easily reduced. In contrast, by arranging the resin member 40 containing a polyurea resin between the electrode body 10 and the laminated outer casing 20, the resin member 40 functions as a buffer member, and the volume change of the electrode body 10 accompanying charging and discharging can be absorbed. Therefore, the reduction in the sealing of the laminated outer casing 20 can be suppressed. In addition, the resin member 40 covers the entire surface of the electrode body 10. As mentioned above Figure 3 As shown, when the electrode body 10 has a first surface S1 , a second surface S2 opposing 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 disposed so as to cover the entire surfaces thereof.

[0030] In the second embodiment, the average thickness of the resin member is greater than 0.5 mm and less than 1.5 mm. If the average thickness of the resin member is too small, the generated gas cannot be temporarily stored inside the resin member, and the generated gas may react immediately with the oxygen in the atmosphere. On the other hand, if the average thickness of the resin member is too large, the structural strength of the resin member becomes too high, and it is difficult to properly release the gas generated from the electrode body to the outside of the battery. The average thickness of the resin member can be more than 0.6 mm, or more than 0.7 mm, or more than 0.8 mm. On the other hand, the average thickness of the resin member can be less than 1.4 mm, or less than 1.3 mm, or less than 1.2 mm.

[0031] The average thickness of the resin member is calculated by the following method. Figure 4B As shown, the thickness of the resin member 40 covering the first surface S1 of the electrode body 10 is set to T1, the thickness of the resin member 40 covering the second surface S2 of the electrode body 10 is set to T2, and the thickness of the resin member 40 covering the third surface S3 of the electrode body 10 is set to T3. Here, regarding the thickness T1, 10 measurement locations are selected without preference, 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 obtain 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 of is set as the average thickness of the resin member.

[0032] In the second method, T 1AVE 、T 2AVE and T 3AVE are greater than 0.5 mm and less than 1.5 mm respectively. In addition, T 1AVE 、T 2AVE and T 3AVE They can be 0.6 mm or more, 0.7 mm or more, or 0.8 mm or more. 1AVE 、T 2AVE and T 3AVE The diameter may be 1.4 mm or less, 1.3 mm or less, or 1.2 mm or less.

[0033] (3) Laminated outer body

[0034] The laminated outer package in the present disclosure is arranged so as to cover the electrode body. Figure 1B and Figure 2B As shown in FIG. 1 , the opposed laminated outer packaging bodies 20 are welded to each other to form a sealing portion α, thereby sealing the electrode body 10. Figure 4A , Figure 4B As shown, the sealing portion α can also be folded. By folding the sealing portion α, the sealing performance is improved. Figure 1B and Figure 2B In the embodiment, two laminated 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 laminated outer casing. As a method for fusing the laminated outer casings to each other, for example, a method of pressing a heating rod on the overlapping portions of the laminated outer casings to heat-fuse the laminated outer casings to each other can be cited.

[0035] 2. Battery components

[0036] The battery in the present disclosure has at least an electrode body, a laminated exterior body, and a resin member.

[0037] (1) Resin components

[0038] The resin member in the present disclosure 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 less susceptible to hydrolysis than polyurea polyurethane.

[0039] 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.

[0040] Polyisocyanates are compounds having two or more isocyanate groups in one molecule. Examples of polyisocyanates include diphenylmethane-4,4'-diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, and polymethylene polyphenyl isocyanate. Examples of polyisocyanates include 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate.

[0041] 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, 1,3-butylenediamine, 1,2-butylenediamine, 1,5-pentanediamine, 1,6-hexanediamine, and dimer diamine. Examples of polyamines include aromatic amines such as o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 1,5-naphthalenediamine, 1,8-naphthalenediamine, m-phenylenediamine, m-phenylenediamine, and p-phenylenediamine. Examples of polyamines include 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, but is, for example, 50 g / mol or more and 1000 g / mol or less.

[0042] 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 chain extenders.

[0043] On the other hand, polyurea polyurethane may be, for example, a resin obtained by polymerizing polyisocyanate, polyamine, and a polyol chain extender, or a resin obtained by polymerizing polyisocyanate, polyol, and an amine chain extender.

[0044] The glass transition temperature of the polyurea resin is not particularly limited, and is, for example, greater than -50°C and less than 250°C. In addition, the resin member preferably contains a polyurea resin as a main component, and more preferably contains only a polyurea resin as a resin component. The elastic modulus of the resin member is not particularly limited, and is, for example, greater than 5 MPa and less than 30 MPa, and may be greater than 8 MPa and less than 15 MPa. In addition, the breaking strength of the resin member at 25°C is, for example, greater than 30 kN / m, and may be greater than 40 kN / m. On the other hand, the breaking strength of the resin member at 25°C is, for example, less than 100 kN / m. In addition, the breaking strength of the resin member at -25°C is, for example, greater than 80 kN / m, and may be greater than 100 kN / m. On the other hand, the breaking strength of the resin member at -25°C is, for example, less than 200 kN / m.

[0045] (2) Electrode body

[0046] The electrode body in the present disclosure generally has 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 is a schematic cross-sectional view illustrating an electrode body in the present disclosure, which is equivalent to Figure 3 A schematic cross-sectional view 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 from one surface of the negative electrode collector 1 in the thickness direction (z direction); 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 from the other surface of the negative electrode collector 1 in the thickness direction (z direction).

[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 Co0.15 Al 0.05 Rock salt layer-type active materials such as Al2O3, spinel-type active materials such as LiMn2O4, and 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, particulate.

[0050] The electrolyte can be a solid electrolyte or a liquid electrolyte. The solid electrolyte can 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 of its high ionic conductivity.

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

[0052] The sulfide solid electrolyte can be a glassy (amorphous) sulfide solid electrolyte, a glass-ceramic sulfide solid electrolyte, or a crystalline sulfide solid electrolyte. The sulfide solid electrolyte can have a crystalline phase. As the above-mentioned crystalline phase, for example, a Thio-LISICON type crystalline phase, an argentite type crystalline phase, and an LGPS type crystalline phase can be cited.

[0053] The composition of the sulfide solid electrolyte is not particularly limited, and examples include 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). 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 . X is at least one of F, Cl, Br, 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). 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) 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 an adhesive, for example, a rubber-based adhesive and a fluoride-based adhesive 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. Examples of the negative electrode active material include metal active materials such as Li, Si, and Sn, carbon active materials such as graphite, and oxide active materials such as Li4Ti5O12.

[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 single substance, Si alloy, or Si oxide. In addition, Si-based active materials can have a diamond-type crystalline phase, a type I crystalline phase, or a type II crystalline phase. In the crystalline phase of the inclusion compound type I or type II, a polyhedron (cage) containing pentagons or hexagons is formed by multiple Si elements. The polyhedron has a space inside that can accommodate metal ions such as Li ions, so that the volume change caused by charging and discharging can be suppressed.

[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 the 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] (3) Laminated outer body

[0062] The laminated outer body in the present disclosure has a structure obtained 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 sequence 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 cited. As the material of the metal layer, for example, aluminum, aluminum alloy, and stainless steel can be cited. As the material of the outer resin layer, for example, polyethylene terephthalate (PET) and nylon can be cited. 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.

[0063] (4)Battery

[0064] like Figure 1A , Figure 1B As shown, the battery 100 has terminals 30 (positive terminal 30a, negative terminal 30b) electrically connected to the electrode body 10. One end of the positive terminal 30a is electrically connected to the positive electrode tab (not shown) in the electrode body 10 inside the laminated outer body 20, and the other end of the positive terminal 30a is exposed outside the laminated outer body 20. Similarly, one end of the negative terminal 30b is electrically connected to the negative electrode tab (not shown) in the electrode body 10 inside the laminated outer body 20, and the other end of the negative terminal 30b is exposed outside the laminated outer body 20. Examples of the material of the terminal include metals such as SUS.

[0065] The battery in the present disclosure is typically a lithium-ion secondary battery. As the use of the battery, for example, a power source for a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), a gasoline vehicle, a diesel vehicle, etc. can be cited. It is particularly preferably used as a driving power source for a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV) or a battery electric vehicle (BEV). In addition, the battery in the present disclosure can be used as a power source for a mobile body other than a vehicle (such as a railway, a ship, an aircraft), and can also be used as a power source for electrical products such as an information processing device.

[0066] The present disclosure is not limited to the above-mentioned embodiments. The above-mentioned embodiments are illustrative, and any technical concept having substantially the same structure and achieving the same function and effect as the technical concept described in the claims of the present disclosure is included in the technical scope of the present disclosure.

[0067] Example 1

[0068] An electrode body having a plurality of single cells having a negative electrode collector, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer and a positive electrode collector in this order in the thickness direction was produced. As the negative electrode active material layer, a negative 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 / 3Co 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) is used. In addition, Ni foil is used as the negative electrode collector and Al foil is used as the positive electrode collector.

[0069] The positive terminal and the negative terminal were mounted on the obtained electrode body, and the laminated outer body (aluminum laminate) was used for sealing. Then, polyurea was applied to the entire surface of the laminated outer body by spraying to form a resin member (average thickness 1 mm). Thus, a battery was obtained.

[0070] Example 2

[0071] The electrode body was prepared in the same manner as in Example 1. A positive terminal and a negative terminal were mounted on the prepared electrode body, and polyurea was spray-coated on the entire surface of the electrode body to form a resin member (average thickness 1 mm). Then, the electrode body covered with the resin member was sealed using a laminated outer body (aluminum laminate) to obtain a battery.

[0072] Comparative Example 1

[0073] A battery was obtained in the same manner as in Example 1 except that the average thickness of the resin member was changed to 0.5 mm.

[0074] Comparative Example 2

[0075] A battery was obtained in the same manner as in Example 1 except that the average thickness of the resin member was changed to 1.5 mm.

[0076] evaluate

[0077] The batteries obtained in Example 1, Example 2 and Comparative Examples 1 and 2 were continuously charged at 5.5C at room temperature to confirm the state of the batteries. As a result, in Comparative Example 1, the battery swelled, smoked (generated white smoke), and then caught fire. In addition, in Comparative Example 2, the battery swelled, smoked, and caught fire at the same time. In contrast, in Example 1 and Example 2, although the battery swelled and smoked, it then faded and did not catch fire. In this way, it was confirmed that by configuring a resin member containing a polyurea resin and having a specified average thickness on the outside or inside of the laminated outer body, the gas generated from 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, wherein: The battery comprises a resin member, the resin member being arranged outside the laminated outer casing, covering the entire surface of the laminated outer casing, and containing a polyurea resin. The average thickness of the resin member is greater than 0.5 mm and less than 1.5 mm.

2. A battery comprising an electrode body and a laminated outer casing covering the electrode body, wherein: The battery includes a resin member, the resin member being arranged between the electrode body and the laminated outer casing, covering the entire surface of the electrode body, and containing a polyurea resin. The average thickness of the resin member is greater than 0.5 mm and less than 1.5 mm.

3. The battery according to claim 1 or 2, wherein: The resin member has an average thickness of 0.7 mm or more and 1.3 mm or less.

4. The battery according to claim 1 or 2, wherein The electrode body comprises a positive electrode active material layer, a negative electrode active material layer and an electrolyte layer, wherein the electrolyte layer is arranged 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, wherein The solid electrolyte is a sulfide solid electrolyte.

Images