JPH10172612A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it difficult to generate the internal short circuit, and to prevent rupture and ignition of a battery when a nail, etc., is pierced in a battery can of the battery in the charged condition by providing a rubber material which is high in elasticity and shows the electric insulation at least on a part of a separate substance and/or an electrode body. SOLUTION: A negative electrode, a positive electrode and a spiral electrode body 14 around which the separate substance is wound, are stored in a battery can. A rubber material which is high in elasticity, i.e., >=3kg/cm<2> in tensile strength and >=10kg/cm<2> in breaking strength, and shown the electric insulation, is provided on the outer circumference of the separate substance and/or the spiral electrode body 14. Even when a projection is pierced from the outside of the battery can, contact of the positive electrode with the negative electrode is prevented by the elasticity of the rubber when the rubber material is provided on the separate substance. When the sheet-like latex rubber 15 of the rubber material is provided on the outer circumference of the spiral electrode body 14, the rubber is entangled around the projection to prevent the contact with the positive electrode with the negative electrode, and the electrode reaction by the internal short circuit can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery having a positive electrode, a negative electrode, and an electrode body made of a separate material. Regarding high batteries.

[0002]

2. Description of the Related Art In recent years, with the spread of portable devices such as video cameras, mobile phones, and notebook computers, demand for small, lightweight, high-capacity secondary batteries has been increasing. At present, most of the secondary batteries used are nickel-cadmium batteries using an alkaline electrolyte. More recently, non-aqueous electrolyte secondary batteries such as lithium secondary batteries and lithium ion secondary batteries that can provide high battery voltage and high energy density have been actively developed. In such a non-aqueous electrolyte secondary battery, a positive electrode, a negative electrode, and an electrode body made of a separate material are generally used as shown in FIG. For example, in a lithium secondary battery, a lithium-metal composite oxide such as LiCoO ₂ is used as a positive electrode active material, and a lithium carrier made of a carbon material that can be doped with and dedoped with Li ions is used as a negative electrode. The positive electrode and the negative electrode are wound in a spiral shape with a separator material interposed therebetween, housed in a cylindrical battery can that constitutes the negative electrode terminal part, injected with a non-aqueous electrolyte, and sealed. In the above, Li ions move to the positive electrode side, and during charging, Li ions move to the negative electrode side.

[0003]

However, in such a battery, a physical shock is externally applied to the dischargeable battery for some reason, such as being accidentally applied to a compressor or piercing a projection. In such a case, the positive electrode and the negative electrode may come into contact with each other due to, for example, damage to the separator inside the battery, resulting in an internal short circuit. When this internal short-circuit occurs, current flows intensively at the short-circuited portion, and the decomposition of the positive and negative electrode materials, the boiling and decomposition of the electrolytic solution due to heat generation occur instantaneously, and the battery may rupture or ignite. . Such an electrode reaction due to an internal short circuit is considered as one of the causes of a rapid heat generation phenomenon of a battery.

[0004] Regarding the safety of batteries,
No. 017, JP-A-6-203827, JP-A-6-215749, JP-A-6-325571, JP-A-6-333548, etc. to improve the safety valve, separator, electrolyte, and core space. Have been reported. However, these measures have a small effect of preventing the battery from being ruptured or ignited by a physical impact on the battery in a charged state, particularly when the battery is pierced into a battery can such as a nail.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a battery which is unlikely to cause an internal short-circuit, which is one of the causes.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention has the following constitution.

[0007] In a battery having a positive electrode, a negative electrode, and an electrode body using a separate substance, a separate substance and / or
Alternatively, at least a part of the electrode body is provided with a rubber material having high elasticity and electrical insulation. "

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is particularly effective against physical impacts such as deformation of a battery can from the outside of the battery can, and all non-aqueous batteries such as lithium ion secondary batteries and lithium metal secondary batteries. It can also be used for electrolyte secondary batteries. It is particularly effective for lithium ion secondary batteries.

The battery may have a cylindrical shape in which a positive electrode and a negative electrode are spirally wound with a separate material interposed therebetween, but are not particularly limited to a rectangular shape, a card type, a coin type and the like. Hereinafter, a cylindrical lithium secondary battery will be described as an example.

The positive electrode and the negative electrode in the present invention are manufactured by providing a positive electrode material or a negative electrode material on one or both sides of a current collector.

The current collector is not particularly limited as long as it has electrical conductivity, and examples thereof include a metal material and a carbonaceous material. In particular, metal materials such as aluminum, copper, nickel, stainless steel, and iron are preferable in terms of workability and cost. The shape of the current collector may be a foil shape, a net shape, a lath shape, or the like, but these are not particularly limited.

The reaction mode of the battery manufactured by the present invention is not particularly limited, but as a battery mounted on a portable device requiring a high energy density, a battery using an alkali metal as a negative electrode material, a carbon A secondary battery using doping of a cation or an anion into a porous material is effective. In the case of these batteries, that is, in the case of a non-aqueous electrolyte secondary battery containing an alkali metal salt, a material in which an anion is doped into a positive electrode material as an electrode material,
A material to be doped with an alkali metal or a cation is used for the negative electrode material.

The positive electrode active material in the electrode of the present invention is not particularly limited, but for example, a Li composite oxide is preferably used. In particular, LiCoO ₂ , LiNi
O ₂ , LiMn ₂ O ₄ , Li _y Ni _1-x Me _x O ₂ (Me: T
i, V, Mn, or Fe), Li _1-xa A _{x
Ni 1-yb B y O 2} ( however, A is at least one alkali or alkaline earth metal element, B is at least one kind of metal element) has a high voltage, because the energy is large, most preferably used . In particular, Li _{1-x- a}
In _{A x Ni 1-yb B y} O 2, 0 <x ≦ 0.1,0 ≦
y ≦ 0.3, −0.1 ≦ a ≦ 0.1, −0.15 ≦ b ≦
0.15 (however, when A and B consist of two or more elements, x is the total number of moles of all transition metal elements excluding Ni, y is the alkali or alkaline earth metal excluding Li,
When y = 0, A contains at least one or more alkaline earth elements), whereby a positive electrode material having excellent characteristics can be obtained. Particularly preferred A is Mg,
Examples of Sr and B include Co and Fe. In addition, as the positive electrode active material, a transition metal oxide containing an alkali metal other than the Li composite oxide, an inorganic compound such as a transition metal chalcogen, polyacetylene, polyparaphenylene, polyphenylenevinylene, polyaniline, polypyrrole, and a conjugate of polythiophene Examples of the positive electrode used in ordinary secondary batteries include a system polymer, a crosslinked polymer having a disulfide bond, and thionyl chloride. Among these, in the case of a secondary battery using a non-aqueous electrolyte containing a lithium salt, transition metal oxides and transition metals such as cobalt, nickel, manganese, molybdenum, vanadium, chromium, iron, copper, and titanium are used. Chalcogens are preferably used.

The negative electrode active material is not particularly limited, but, for example, a carbonaceous material is preferably used.
The carbonaceous material is not particularly limited,
Carbon fibers, carbonaceous materials such as artificial or natural graphite powder, inorganic compounds such as fluorocarbon, metals and metal oxides, and organic high molecular compounds can be used. The form may be powdery, fibrous, etc., and may be crystalline or non-crystalline. The carbon fiber used here is not particularly limited, but generally is obtained by firing an organic substance. Specifically, PAN-based carbon fiber obtained from polyacrylonitrile (PAN), pitch-based carbon fiber obtained from pitch such as coal or petroleum, cellulosic carbon fiber obtained from cellulose, gas obtained from gas of low molecular weight organic matter, etc. Examples include phase-grown carbon fibers, and carbon fibers obtained by firing polyvinyl alcohol, lignin, polyvinyl chloride, polyamide, polyimide, phenol resin, furfuryl alcohol, and the like are also preferably used. Among these carbon fibers, carbon fibers satisfying the characteristics are appropriately selected and used according to the characteristics of the electrode and the battery in which the carbon fibers are used. In the carbon fiber,
When used for a negative electrode of a secondary battery using a non-aqueous electrolyte containing an alkali metal salt, PAN-based carbon fibers and pitch-based carbon fibers are preferred. Among them, PAN-based carbon fibers are preferably used in that the doping of alkali metal ions, particularly lithium ions, is good.

[0015] The diameter and length of the carbon fiber are not particularly limited, but they are easy to apply with a coater, and when wound,
It is preferable to use milled carbon fibers from the viewpoint of preventing occurrence of short circuit during tension reinforcement. The milled carbon fiber preferably has a diameter of 0.1 to 1000 μm, more preferably 3 to 10 μm, and an average length of 5 to 1000 μm,
Further, the thickness is preferably 7 to 100 μm. When using a milled carbon fiber, it is more preferable to perform high-temperature heat treatment in advance to improve cycle characteristics.

In the present invention, it is preferable to add various conductive materials in order to improve the conductivity of the electrode. The conductive material that can be used is not particularly limited, such as a carbon material and a metal powder, but various carbon blacks are particularly preferred as the conductive material. Specific examples of carbon black include gas black, oil black, acetylene black, and the like.The furnace method, using creosote oil, petroleum heavy oil, natural gas, naphthalene, pitch oil, acetylene gas, etc. as raw materials, Those manufactured by a contact method, a thermal method, or the like can be used. Among carbon blacks, acetylene black or Ketjen black having a significantly low hydrogen content and a large carbon content is preferably used from the viewpoint of conductivity. In addition, from the viewpoints of further improving conductivity and improving electrode characteristics, it is also possible to use natural graphite, artificial graphite and the like in combination. In order to improve the conductivity by adding a conductive material, the optimal particle size and the amount of addition should be determined experimentally by the material, shape, particle size of the active material, the type of the binder, and the amount of the binder. Usually 0.001-100μ in primary particle size
m, more preferably 0.005 to 20 μm, and the amount of addition is 0.1 to 20 wt%.
More preferably, 0.5 to 10 wt% is used. If the primary particle diameter is less than 0.001 μm, the production may be insufficient in terms of stable production, and if it exceeds 100 μm, the effect of addition tends to be small. on the other hand,
If the addition amount is less than 0.1 wt%, the effect of addition is small,
If it exceeds wt%, the capacity per unit weight of the electrode tends to decrease.

In the present invention, it is also preferable to add other binders and the like. For example, polyvinylidene chloride, polyvinylidene fluoride, cellulose and / or a cellulose salt, polyethylene, polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl pyrrolidone Resins such as tetrafluoroethylene, polyamide, polyimide, polysulfide, polyvinyl methyl ether, polyethylene glycol, polyethylene oxide, polypropylene oxide, epoxy resin, melamine resin, polyvinyl pyridine, higher alcohols, and salts thereof can also be used.

The method of connecting the leads to the positive electrode current collector and / or the negative electrode current collector is not particularly limited, and a known connection method can be used. Specific examples include resistance welding, ultrasonic welding, cold welding, and mechanical connection using rivets.

The material of the lead is not particularly limited as long as it has electrical conductivity, and examples thereof include a metal material and a carbonaceous material. Especially aluminum, copper, nickel, stainless steel,
A metal material such as iron is preferable in terms of workability and cost.
In addition, the shape may be a foil shape, a net shape, a lath shape, or the like, but these are not particularly limited.

The method of manufacturing the electrode is not particularly limited, but a binder, an active material, and a conductive material are kneaded on a current collector such as aluminum, nickel, stainless steel, or copper with an organic solvent or water to form a paste. The dried product is applied, dried, and pressed to form a sheet. The solvent and the solid content concentration used for pasting are not particularly limited, but are appropriately determined experimentally in consideration of the resin used, the coating method, the drying conditions, and the like.

The paste may contain various additives such as a surfactant for improving coating properties, an antifoaming agent, a dispersant, an ultraviolet absorber, and a stabilizer for improving storage stability. it can.

The material of the separate substance in the present invention is not particularly limited as long as it can prevent the electrode reaction between the battery can and the electrode or / and the positive and negative electrodes in the battery can, that is, exhibits electrical insulation. Further, it is desirable that the electrolyte has good permeability and does not cause electron or ion transfer resistance. Representative materials include polyolefin, polyester, polyamide, polyacrylate, polymethacrylate, polysulfone, polycarbonate, and polytetrafluoroethylene. , Polysulfone and the like. Among them, polyethylene, polypropylene polysulfone and the like are preferable because of their excellent strength and safety. Examples of the shape of the separate substance generally include a porous film and a nonwoven fabric, but a porous film is preferable because the filling rate in a battery can is easily increased. Further, the porous membrane is generally a symmetric membrane or an asymmetric membrane, but may be a composite membrane in which a plurality of types of membranes are laminated in order to improve strength and safety. The porosity of the porous film is preferably as high as possible in order to increase the permeability of electrons and ions, but there is a risk of causing a decrease in the strength of the film, so it should be determined according to the material and the film thickness. is there. Generally, it is desirable that the film thickness is 20 to 100 μm and the porosity is 30 to 80%. Further, the diameter of the holes is preferably within a range in which the active material, the binder, and the conductive material detached from the electrode sheet do not pass therethrough.
It is preferably from 01 to 1 μm.

In the present invention, the separating substance is provided by sandwiching the separating substance between the positive and negative electrodes at the time of winding, and is provided by previously attaching or applying the separating substance to the electrode surface. . The rubber material in the present invention is not particularly limited, and may be any material having high elasticity and electrical insulation. Here, the high elasticity is preferably a tensile strength of 3 kg.
/ cm ² or more and a tear strength of 10 kg / cm or more. Further, the electrical insulation means that the volume resistivity is preferably 10 ⁶ Ωcm or more, more preferably 10 ⁸ Ωcm or more. Specifically, for example, natural rubber, styrene rubber, styrene-butadiene rubber, butadiene rubber, isoprene rubber, nitrile rubber, chloroprene rubber, butyl rubber, ethylene-propylene rubber, ethylene-acryl rubber, acrylic rubber, acrylonitrile-butadiene rubber, Epichlorohydrin rubber, chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber, fluoro rubber, fluorinated silicone rubber, ethylene tetrafluoride
Examples include propylene rubber, propylene oxide rubber, silicone rubber, urethane rubber, polysulfide rubber, norbornene rubber, polysulfide rubber, hydrogen nitrile rubber, special polyether rubber, and polyurethane fiber. Also, the shape of the rubber material is not particularly limited, and the rubber material may be used without any particular limitation, such as a sheet shape or a woven shape.

The rubber material in the present invention is provided on at least one part of the separate substance and / or on at least one part of the outer periphery of the electrode body. When it is provided on a separate material, it is provided by a method such as winding with the separate material or sandwiching it between the separate material and the positive electrode and / or the negative electrode. Moreover, when it is provided on the outer periphery of the electrode body, it is provided by a method such as covering the outer periphery of the electrode body or attaching to the electrode body.

In the present invention, the battery can in which the electrode body is loaded is not particularly limited, but a battery can in which iron is plated with a metal such as Ni, a stainless steel battery can, etc.
It is preferable because of its excellent strength, corrosion resistance and workability. Also,
It is possible to reduce the weight by using aluminum alloys and various engineering plastics, and it is also possible to use various engineering plastics and metals together.

The solvent used for the electrolyte of the non-aqueous electrolyte secondary battery is not particularly limited, and a conventional electrolyte solvent can be used. For example, propylene carbonate,
Ethylene carbonate, γ-butyrolactone, N-methyl-2-pyrrolidone, acetonitrile, N, N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, 1,3-dioxolan, methyl formate, sulfolane, oxazolidone, thionyl chloride, 1,2 -Dimethoxyethane, diethylene carbonate, dimethyl carbonate, dimethyl imidazolidinone and the like, and derivatives thereof, may be used alone or as a mixture of two or more.

The electrolyte contained in the electrolyte may be an alkali metal, especially lithium halide, perchlorate, thiocyanate, borofluoride, phosphorus fluoride, arsenic fluoride, aluminum fluoride, trifluorofluoride Methyl sulfate and the like are preferably used. In particular, lithium salt has the lowest standard electrode potential and can obtain a large potential difference,
It is more preferably used as an electrolyte contained in an electrolytic solution.

The non-aqueous electrolyte secondary battery is generally prepared by a known method,
That is, a positive electrode coated on an aluminum foil and a negative electrode coated on a copper foil are wound through a separate substance, inserted into a battery can, the negative electrode is welded to the battery can, the positive electrode is welded to the lid, and the electrolytic solution is formed. Is injected and then sealed. In the present invention, a battery in which a negative electrode is electrically bonded to a battery can is described. However, the positive and negative electrodes may be reversed.

FIG. 1 is a schematic view showing a case where a rubber material is provided on the separate substance of the present invention. 1, 1 is a negative electrode, 2 is a positive electrode, 3 is a separate substance, 4 is an insulating plate, 5 is a battery can,
Reference numeral 6 denotes a sealing gasket, 7 denotes a battery cover, 8 denotes a safety valve, 9 denotes a negative electrode lead, 10 denotes a positive electrode lead, and 11 denotes a veil-like rubber material.

FIG. 2 is a schematic view showing a case where a rubber material is provided on the outer periphery of the electrode body of the present invention. In FIG. 2, 12 is a negative electrode lead, 13 is a positive electrode lead, 14 is a spiral electrode body, 1
Reference numeral 5 denotes a veil-like rubber material.

In the present invention, first, when a rubber material is provided on the separate substance, when there is a physical impact from the outside of the battery can such that the battery can is deformed, the negative electrode and / or
Alternatively, the current collector that is in electrical contact with the positive electrode is deformed and pierces the separate substance. However, since the rubber elasticity of the separate portion acts, the internal short circuit is prevented from being caused between the positive electrode and the negative electrode through contact or / and an electrically conductive protrusion such as a nail.

When a rubber material is provided on the outer periphery of the electrode body, and when a physical impact is applied from outside the battery can, first,
The protrusions such as nails pierce the rubber material covering the outer periphery of the electrode body, but the rubber elasticity acts and the protrusions are entangled with the rubber, piercing the separate substance, the positive electrode and the negative electrode, so that the positive electrode and the negative electrode come into contact. To prevent internal short circuit that occurs in

Therefore, it is possible to provide a battery in which an electrode reaction due to an internal short circuit does not occur and a rapid heat generation does not occur.

[0034]

The present invention will be described in more detail with reference to the following examples. The present invention is not limited to these examples.

Example 1 LiCoO ₂ as a positive electrode active material; “Cell seed” 20 μm
m (manufactured by Nippon Chemical Industry Co., Ltd.), 89.5 wt%, acetylene black: "Denka Black" (manufactured by Denki Kagaku Kogyo Co., Ltd.) 3 wt%, and polyvinylidene fluoride: "KF polymer" as a binder # 1100 (manufactured by Kureha Chemical Industry Co., Ltd.) was mixed at 7.5 wt%, and this mixture was mixed with N-
It was dispersed in methyl-2-pyrrolidone to form a paste.
Then, a positive electrode active material weight per unit area of this paste aluminum foil current collector having a thickness of 20 [mu] m, 160 g / m ² in winding the inner surface was uniformly coated so that the winding outer surface 176 g / m ² After drying, a roll press was performed to obtain a positive electrode sheet.

Next, 89.5% by weight of PAN-based carbon fiber “Treca” T-300 (manufactured by Toray Industries, Inc.) as a negative electrode active material was milled, and acetylene black: “Denka Black” as a conductive material. 5 wt%, polyvinylidene fluoride as binder: "KF polymer"# 1100
15 wt% was mixed and dispersed in N-methyl-2-pyrrolidone like the positive electrode to form a paste. Then, the paste is uniformly applied to both sides of a copper foil current collector having a thickness of μm so that the weight of the negative electrode active material per unit area is 65 g / m ² , and the paste is dried and then roll-pressed. Thus, a negative electrode sheet was obtained.

Next, as a positive electrode lead, a current collector portion 13 mm away from the positive electrode material application end inside the positive electrode sheet was provided.
An aluminum plate having a thickness of 100 μm and a width of 3 mm was ultrasonically welded. In addition, three minutes from the negative electrode application end outside the negative electrode sheet
10 mm in thickness as a negative electrode lead
A 0 μm nickel plate was ultrasonically welded.

Next, a porous polyethylene film (Mitsubishi Chemical Corporation) was used as a separator with the positive and negative electrodes obtained above as separators.
) And a sheet-like polyurethane fiber, the positive electrode was overlapped so as to be inside, and wound, thereby obtaining a spiral electrode.

The internal resistance of the electrode body was measured with a tester, and after confirming that there was no internal short circuit in the electrode body, the battery was loaded into a battery can with insulators placed above and below the electrode body, and
M electrolyte LiPF ₆ dissolved in propylene carbonate + 1,2-dimethoxyethane (mixing volume ratio 1: 1) electrolyte (manufactured by Mitsubishi Petroleum Co., Ltd.), a battery lid was installed, and the As a result, a battery using the rubber material for the separator portion of the present invention shown in FIG. 1 was obtained.

After charging this battery under the conditions of an upper limit voltage of 4.2 V and a current of 1 A for 3 hours, the battery can was crushed with a round bar having a diameter of 1 cm. As a result, no rupture or ignition of the battery can was observed. Even when a nail having a diameter of 3 mm was pierced, no rupture or ignition of the battery can was observed.

Example 2 Example 1 Both positive and negative sheets were produced under the same conditions and under the same method, and the positive and negative leads were ultrasonically welded.

Next, the positive electrode and the negative electrode obtained above were used as separators, and the positive electrode was placed inside through a porous polyethylene film and wound, thereby obtaining a spiral electrode.

The internal resistance of the electrode body was measured with a tester, and after confirming that there was no internal short circuit in the electrode body, a sheet-like latex rubber was wrapped around the electrode body as shown in FIG.
A battery can was charged in a state where insulators were installed above and below the electrode body, and propylene carbonate in which 1 M of electrolyte LiPF ₆ was dissolved + 1,2-dimethoxyethane (mixing volume ratio 1:
1) An electrolyte was injected, a battery lid was set, and the battery was caulked through a sealing gasket to obtain a battery using a rubber material on the outer periphery of the electrode body in the separator portion of the present invention.

After charging this battery under the conditions of an upper limit voltage of 4.2 V and a current of 1 A for 3 hours, the battery can was crushed with a round bar having a diameter of 1 cm, and no rupture or ignition of the battery can was observed. Even when a nail having a diameter of 3 mm was pierced, no rupture or ignition of the battery can was observed.

Comparative Example 1 Example 1 Both sheets of a positive electrode and a negative electrode were produced under the same conditions and under the same method, and the positive electrode lead and the negative electrode lead were ultrasonically welded.
A spiral electrode was obtained by laminating and winding the positive electrode inside through a porous polyethylene film.

The internal resistance of the electrode body was measured with a tester, and after confirming that there was no internal short circuit in the electrode body, the battery was loaded into a battery can with insulators placed above and below the electrode body, and
A propylene carbonate + 1,2-dimethoxyethane (mixing volume ratio: 1: 1) electrolytic solution in which an M electrolyte LiPF ₆ is dissolved is injected, a battery lid is set, and a rubber material is not used by caulking through a sealing gasket. I got a battery.

This battery was replaced with an upper limit voltage of 4.2 as in Example 1.
After charging for 3 hours under the conditions of V, current 1A, diameter 1c
When the battery can was crushed with a round bar of m, the battery can generated heat,
Exploded, ignited. Even when a nail having a diameter of 3 mm was pierced, the battery can generated heat, burst, and ignited.

[0048]

According to the present invention, it is possible to manufacture a battery in which an internal short circuit between the positive and negative electrodes due to a physical impact on the battery can hardly occurs.

[Brief description of the drawings]

FIG. 1 is a schematic view of a battery of the present invention in which a separate portion is improved.

FIG. 2 is a schematic view of the electrode body of the present invention with an improved outer periphery.

FIG. 3 is a schematic view of a general battery including a positive electrode and a negative electrode and a separate material.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 negative electrode 2 positive electrode 3 separator 4 insulating plate 5 battery can 6 sealing gasket 7 battery lid 8 safety valve 9 negative electrode lead 10 positive electrode lead 11 sheet-like polyurethane fiber 12 negative electrode lead 13 positive electrode lead 14 spiral electrode body 15 sheet-like latex rubber

Claims (4)

[Claims] In a battery having a positive electrode, a negative electrode and an electrode body using a separate substance, at least a part of the outer periphery of the separate substance and / or the electrode body has a highly elastic and electrically insulating rubber material. A battery characterized by comprising: 2. The battery according to claim 1, wherein carbon fibers are used as the positive electrode material and / or the negative electrode material. 3. The battery according to claim 2, wherein the carbon fiber is a polyacrylonitrile-based carbon fiber. 4. The battery according to claim 2, wherein the carbon fibers are milled carbon fibers.