JP2001266950A - Non-aqueous electrolytic solution secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To aim at weight reduction by making case materials into resin materials, achieve high weight energy density, and provide a non-aqueous electrolytic solution secondary battery which is superior in safety. SOLUTION: This non-aqueous electrolytic solution secondary battery is separated and not directly contacting a main body part consisting of a positive electrode active substance layer of a positive electrode and a case resin. In other words, this non-aqueous electrolytic solution secondary battery is, by not contacting a positive electrode active substance forming an oxygen of a high activity at the time of overcharging to a resin part of a case, oxygen formed by positive electrode active substance deactivates with the process of dispersing to the resin part of the case, and as a result, a decomposition reaction of a resin by the oxygen is restrained by the reduction of reactivity, and it is considered that overheat by an abnormal generation of heat is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte as an electrolyte. More specifically, the present invention relates to a non-aqueous electrolyte secondary battery having excellent weight energy density.

[0002]

2. Description of the Related Art In recent years, non-aqueous electrolytes such as lithium ion secondary batteries have been used because of their high weight energy density as a clean energy source used for power supplies for automobiles such as notebook personal computers, small portable telephones and portable video cameras and for automobiles. Liquid secondary batteries have attracted attention.

A conventional lithium secondary battery includes a positive electrode having a positive electrode active material layer capable of releasing and storing lithium ions on its surface, a negative electrode capable of storing and releasing lithium ions released from the positive electrode, and a positive electrode and a negative electrode. An electrode body formed by laminating an intervening separator and an electrolyte for moving lithium ions between the positive electrode and the negative electrode as main parts, and these are made of stainless steel, Ni-plated steel sheet,
It was stored in a metal case made of aluminum or the like.

[0004] JP-A-6-124692 and JP-A-59-1
Japanese Patent No. 38054 proposes a case made of resin from the viewpoint of further weight reduction of a battery in recent years and prevention of short circuit by a metal case.

[0005]

However, in the case where a resin material is used as a case, it has been observed that the battery may be overcharged and generate abnormal heat if the charging device fails. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and achieves high weight energy density while achieving weight reduction by using a resin material for a case material.
An object of the present invention is to provide a non-aqueous electrolyte secondary battery that can obtain excellent safety.

[0007]

The present inventors have conducted intensive studies on the mechanism of this abnormal heat generation. As a result, the abnormal heat generation inside the battery at the time of overcharge is caused by Joule heat due to charging and the positive electrode due to overcharge. It has been clarified that the generation of heat due to the reaction of highly reactive oxygen desorbed from the resin case with polypropylene or the like is caused by synergistic progress. It has been clarified that this highly active oxygen elimination reaction proceeds by overcharging even in the positive electrode active material layer not facing the negative electrode. The present inventors have made the following inventions for the purpose of solving the above problems based on this discovery.

That is, the non-aqueous electrolyte secondary battery of the present invention is characterized in that the positive electrode active material layer of the positive electrode and the main body, which is a portion of the case made of resin, are separated and not in direct contact.

That is, the non-aqueous electrolyte secondary battery of the present invention
Positive contact between the positive electrode active material, which generates highly active oxygen during overcharging, and the resin part of the case does not occur due to the diffusion of oxygen generated by the positive electrode active material to the resin part of the case, or a safety valve. It is thought that the decomposition reaction due to oxygen of the resin is suppressed due to the release of the resin from the case to reduce the reactivity, and as a result, overheating due to abnormal heat generation is suppressed. Here, “not in direct contact” in the present specification means that “between the molecules of the main body and the positive electrode active material, active oxygen generated in the positive electrode active material during overcharge moves to the main body. In the meantime, there is an interval that can deactivate the reactivity of the main body with the resin by a predetermined ratio or more, where the predetermined ratio is based on the amount of active oxygen generated in the positive electrode active material. , Means the ratio of the amount deactivated before moving to the main unit or the amount released from the safety valve to the outside of the case.Highly active oxygen that reaches the main unit without deactivating reacts with the resin in the main unit. At a rate that does not further synergistically promote the decomposition of the positive electrode active material due to the heat generated in the above. "

Therefore, the non-aqueous electrolyte secondary battery of the present invention provides a non-aqueous electrolyte secondary battery that is light in weight by using a molded resin case and that is safe even when overcharged. be able to.

Further, the separator has a melting point of 150.
It is preferable to form from a material having a temperature of not less than ° C.

Even if the reaction between oxygen generated from the positive electrode and the main body of the case is suppressed by the non-aqueous electrolyte secondary battery of the present invention, Joule heat continues to be generated by charging, and the heat generated causes the separator to melt. The melting temperature of the separator is set to 1 in order to prevent a short circuit between the positive and negative electrodes.
The temperature was set to 50 ° C. or higher.

Therefore, the non-aqueous electrolyte secondary battery of the present invention has the effect of reducing the risk of short circuit between the positive electrode and the negative electrode, thereby providing a safer and lighter secondary battery.

In the case of a non-aqueous electrolyte secondary battery in which the electrode body of the non-aqueous electrolyte secondary battery is a wound electrode body formed by winding the positive electrode, the negative electrode, and the separator,
It is preferable that the outermost peripheral surface of the spirally wound electrode body is formed of at least one of the negative electrode, the separator, and the positive electrode having a surface on which the positive electrode active material layer is not formed.

Since the outermost peripheral surface of the spirally wound electrode body may come into contact with the case, the positive electrode active material and the main body of the case are prevented from being exposed on the outermost peripheral surface. Since there is no direct contact, the above-described abnormal heat generation during overcharge can be suppressed.

Therefore, the non-aqueous electrolyte secondary battery of the present invention can provide a lightweight non-aqueous electrolyte secondary battery that is safe at the time of overcharge even if the electrode body is a wound electrode body. .

In the case of a non-aqueous electrolyte secondary battery in which the electrode body of the non-aqueous electrolyte secondary battery is a stacked electrode body formed by laminating the positive electrode, the negative electrode, and the separator in parallel. It is preferable that both end portions of the stacked electrode body are at least one of the negative electrode, the separator, and the positive electrode having a surface on which the positive electrode active material layer is not formed.

Since the laminated end of the laminated electrode body may come into contact with the case, the positive electrode active material and the main body of the case are directly connected to each other by preventing the positive electrode active material from being exposed at the laminated end. Since there is no contact, abnormal heat generation at the time of overcharging can be suppressed.

Therefore, the non-aqueous electrolyte secondary battery of the present invention can provide a lightweight non-aqueous electrolyte secondary battery that is safe during overcharge even if the electrode body is a stacked electrode body.

The separator is made of polybenzimidazole, polyimide, polyetherimide, polyamideimide, polyphenylene sulfide, polyethersulfone, polysulfone, polyetherketone, polymethylpendene, aramid, polyvinylidene fluoride,
It is preferably at least one of polyamide, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyarylate, and polyacetal.

When these resins are used alone or in combination as a separator, a separator that is resistant to heat generation during overcharge can be obtained.

Therefore, the non-aqueous electrolyte secondary battery of the present invention has the effect of reducing the risk of a short circuit between the positive electrode and the negative electrode, thereby providing a safer and lighter secondary battery.

Further, it is preferable that the case has an isolation portion made of at least one of a metal, a metal oxide, and a resin having a melting point of 150 ° C. or higher.

The positive electrode active material and the case main body can be separated from each other by interposing an isolating portion made of a film formed by performing metal plating or the like on the case main body or a resin film having a melting point of 150 ° C. or more. Since there is no direct contact, the decomposition reaction of the resin in the main body can be suppressed. In addition, by including a material having a melting point of 150 ° C. or higher in a part of the main body, a reaction area between the main body and oxygen generated from the positive electrode is reduced by a microscopic isolation portion formed in the main body. Since the positive electrode active material is not in direct contact with the case body, the decomposition reaction of the resin in the case body can be suppressed.

Therefore, the non-aqueous electrolyte secondary battery of the present invention can provide a lightweight non-aqueous electrolyte secondary battery that is safe even when overcharged.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the nonaqueous electrolyte secondary battery of the present invention will be described below in detail. Note that the present invention is not limited by the following embodiments. In addition, the figures are schematic views, and dimensions and forms are not accurate. In the present embodiment, the present invention will be described by taking a lithium ion secondary battery as an example. However, the nonaqueous electrolyte secondary battery of the present invention is not limited to a lithium ion secondary battery, and may be overcharged. An electrode body formed by stacking a positive electrode and a negative electrode on which a positive electrode active material layer that releases oxygen sometimes is formed, and a separator interposed between the positive electrode and the negative electrode, a non-aqueous electrolyte, and the electrode body therein. Any non-aqueous electrolyte secondary battery having a resin case containing the non-aqueous electrolyte is applicable.

A lithium ion secondary battery is a lithium-ion battery capable of inserting and extracting lithium ions as a positive electrode active material.
It has a positive electrode having a metal composite oxide as a positive electrode active material layer, and a negative electrode capable of inserting and extracting lithium ions. Hereinafter, the lithium ion secondary battery of the present embodiment will be described based on specific examples.

The lithium ion secondary battery of the present embodiment is
The shape is not particularly limited, and it can be used as batteries of various shapes such as a coin type, a cylindrical type, and a square type. In the present embodiment, as shown in FIG. 1, description will be made based on a cylindrical lithium ion secondary battery 100. Since the lithium ion secondary battery described in the present embodiment is cylindrical, the internal electrode is wound in a cylindrical shape, but if the shape of the battery is different, the internal electrode It is needless to say that the shapes are different. For example, in a prismatic battery,
As shown in FIG. 3, the internal electrode is not wound, and may be a laminated electrode in which a plurality of positive electrodes 1 "and negative electrodes 2" are laminated via a separator 4 ".

FIG. 1 is a schematic cross-sectional perspective view of a cylindrical lithium ion secondary battery 100 according to this embodiment. In the lithium ion secondary battery 100 of the present embodiment, the positive electrode 1 and the negative electrode 2 are formed in a sheet shape, both of which are laminated via a separator 4, and a spirally wound spirally wound electrode is formed together with the electrolyte 3 filling the void. It is housed in a predetermined cylindrical case 7. The positive electrode 1 and the positive electrode terminal 5 are electrically connected to each other, and the negative electrode 2 and the negative electrode terminal 6 are electrically connected to each other.

The wound electrode comprises a positive electrode 1, a negative electrode 2 and a separator 4. The positive electrode 1 and the negative electrode 2 are formed in a sheet shape, and both are laminated via the separator 4 and wound in a spiral form many times. .

The portions that may come into contact with the main body of the case of the wound electrode body are the portions of the negative electrode 2, the separator 4, and the positive electrode 1 where no positive electrode active material layer described later is partially formed. At least one of the provided surfaces. More preferably, the negative electrode 2 and the separator 4 are used. This is because the surface of the positive electrode on which the positive electrode active material is not formed at the time of overcharging has an oxidation potential, and active oxygen may be generated due to decomposition of the electrolytic solution.

It is preferable that the positive electrode active material is not similarly exposed at a portion of the case 7 that may come into contact with a later-described main body portion 70 even when the shape of the electrode body is not a wound type. For example, as shown in FIG. 3, in a laminated electrode body in which the positive electrode 1 ″, the negative electrode 2 ″, and the separator 4 ″ are not wound, but are simply laminated in parallel, the portion corresponding to the lamination end is the negative electrode 2 ″, the separator 4 ″. It is preferable that at least one of the surfaces provided with a portion in which a positive electrode active material layer described later is not partially formed is provided on the surface of "" and the positive electrode 1 ".

The positive electrode 1 releases lithium ions during charging and can store lithium ions during discharging.
A metal composite oxide is included in the positive electrode active material. The lithium-metal composite oxide has excellent performance of the active material, such as excellent diffusion performance of electrons and lithium ions. Therefore, when such a composite oxide of lithium and transition metal is used for the positive electrode active material, high charge / discharge efficiency and good cycle characteristics can be obtained. Further, as the positive electrode 1, it is preferable to use a material obtained by applying a positive electrode mixture obtained by mixing a positive electrode active material, a conductive material and a binder to a current collector.

The positive electrode active material includes a lithium-metal composite oxide.
Is not particularly limited as long as it is a known active material.
Can be used. For example, Li_(1-X)NiO_Two,
Li _(1-X)MnO_Two, Li_(1-X)Mn_TwoO_Four, Li_(1-X)Co
O_TwoAnd transition metals such as Li, Al, and Cr, respectively.
Materials added or substituted are exemplified. The positive electrode active
Limited to the case where one kind of substance is used alone
Instead, a plurality of substances may be used as a mixture. And
X in the example of this positive electrode active material shows the number of 0-1.

The material composition of the negative electrode 2 is not particularly limited as long as it can occlude lithium ions during charging and release lithium ions during discharging.
A known material configuration can be used. In particular, it is preferable to use a material obtained by applying a negative electrode mixture obtained by mixing a negative electrode active material, a conductive material and a binder to a current collector. The negative electrode active material is not particularly limited by the type of the active material, and a known negative electrode active material can be used. Above all, carbon materials such as natural graphite and artificial graphite having high crystallinity have excellent performance of active materials such as excellent lithium ion occlusion performance and diffusion performance. Therefore, when such a carbon material is used for the negative electrode active material, high charge / discharge efficiency and good cycle characteristics can be obtained. Further, it is more preferable to use lithium metal or a lithium alloy as the negative electrode 2 from the viewpoint of battery capacity.

The separator 4 serves to electrically insulate the positive electrode 1 and the negative electrode 2 and to maintain the electrolytic solution 3 to ensure conduction of lithium ions between the positive electrode 1 and the negative electrode 2. Therefore, it is preferable that the material constituting the separator 4 has a high insulating property and has pores or inter-molecular gaps which do not hinder the permeation of ions. For example, a microporous film can be used as the separator 4. Here, as described above, the melting point of the material used for the separator 4 is preferably 150 ° C. or higher, and more preferably 180 ° C. or higher, from the viewpoint of safety during overcharge. As a material used for the separator 4, a resin is more preferable because of its high performance such as moldability. Further, among resins, in relation to the melting point described above, polybenzimidazole, polyimide, polyetherimide, polyamideimide, polyphenylene sulfide, polyethersulfone, polysulfone, polyetherketone, polymethylpendene, aramid, polyvinylidene flow It is more preferable to use at least one of ride, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, and polyacetal. Among them, it is more preferable to use polyethylene terephthalate, polybutylene terephthalate, and polyphenylene ether. Further, as the separator 4, polyethylene terephthalate is more preferable from the viewpoint of cost and performance.

As a method of manufacturing the separator 4, a solution obtained by dissolving the above-mentioned resin or the like in a good solvent is applied on a flat plate,
It is manufactured by a chemical method such as immersion in a poor solvent to cause phase separation, or a physical method such as stretching and stretching the above-mentioned resin melt-molded into a film. In addition, the size of the separator 4 is preferably larger than the sizes of the positive electrode 1 and the negative electrode 2 in order to ensure the insulation between the positive electrode 1 and the negative electrode 2 more reliably. In this case, it is preferable to increase the size of the separator 4 so that the separator 4 protrudes to some extent from the electrode body, since this also has the effect that the positive electrode active material can be more reliably separated from the main body 70 of the case described later.

The electrolytic solution 3 is obtained by dissolving an electrolyte in an organic solvent.

The organic solvent is not particularly limited as long as it is an organic solvent usually used for an electrolyte of a lithium ion secondary battery. Examples thereof include a carbonate compound, a lactone compound, an ether compound, a sulfolane compound, a dioxolane compound, and a ketone. Examples include compounds, nitrile compounds, halogenated hydrocarbon compounds, and the like.

Specifically, carbonates such as dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, ethylene glycol dimethyl carbonate, propylene glycol dimethyl carbonate, ethylene glycol diethyl carbonate, and vinylene carbonate, γ-butyl lactone Lactones such as dimethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, ethers such as tetrahydropyran and 1,4-dioxane, sulfolane such as sulfolane and 3-methylsulfolane, dioxolanes such as 1.3-dioxolan and 4, Ketones such as -methyl-2-pentanone; nitriles such as acetonitrile, pyropionitrile, pareronitrile, and benzonitrile Halogenated hydrocarbons such as 1,2-dichloroethane, other methyl formate,
Examples thereof include dimethylformamide, dimethylformamide, and dimethylsulfoxide. These may be used alone or in a mixture of a plurality of organic solvents selected from these.

By using one or more non-aqueous solvents selected from the group consisting of carbonates and ethers among these organic solvents mentioned in the examples, the solubility, dielectric constant and viscosity of the electrolyte are improved. This is preferable because the charge and discharge efficiency of the battery is high.

The type of the electrolyte is not particularly limited, but an inorganic salt selected from LiPF ₆ , LiBF ₄ , LiClO ₄ and LiAsF ₆ , a derivative of the inorganic salt,
LiSO ₃ CF ₃ , LiC (SO ₂ CF ₃ ) ₂ and LiN
It is preferably at least one kind of an organic salt selected from (SO ₂ CF ₃ ) ₂ and a derivative of the organic salt.

With this electrolyte, the battery performance can be further improved, the battery performance can be maintained even higher in a temperature range other than room temperature, and the flame retardancy is extremely excellent.

The concentration of the electrolyte is not particularly limited either, and it is preferable to appropriately select the concentration in consideration of the type of the electrolyte and the organic solvent depending on the application.

The case 7 has a main body 70 which is a resin molded product molded from a resin. By making the main part of the case 7 made of resin, there is an effect that the battery weight can be reduced while maintaining the same strength as that of the metal case. Examples of the resin that can be used for the case 7 include polyolefin resins such as polypropylene and polyethylene, polyether resins such as polyoxymethylene, polyoxypropylene, and polyoxyphenylene, and polyphenylene sulfide. Of these, polyolefin resins such as polypropylene are preferable because they are inexpensive and can reduce the weight of the battery. In addition, by mixing a resin having a melting point of 150 ° C. or more into the main body 70 as an isolation part, the antioxidant property of the main body 70 can be improved. For example, polybenzimidazole, polyimide,
Polyether imide, polyamide imide, polyphenylene sulfide, polyether sulfone, polysulfone,
Polyetherketone, polymethylpendene, aramid,
It is preferable to mix at least one of polyvinylidene fluoride, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyarylate, and polyacetal.

It is preferable that a coating of a metal, a metal oxide, and the above-mentioned resin having a melting point of 150 ° C. or more is formed on the inner wall of the main body 70 as an isolation portion. As a method for forming these films, there are a method of forming a metal or metal oxide film by plating, sputtering, vapor deposition, etc., a method of forming a film made of a resin having a melting point of 150 ° C. or more by plasma polymerization or the like, and a method of physically forming each thin film. And the like. In addition, the case 7 and the electrode are not in direct contact with each other by interposing a film-like member as a separate component, not as an integral part of the case 7, between the main body 70 and the electrode body as an isolation portion. It can also be.

A method for manufacturing a lithium ion secondary battery having the above configuration will be described using the above-described cylindrical battery 100 as an example. LiNiO ₂ as a positive electrode active material, acetylene black as a conductive material, and polyvinylidene fluoride as a binder are mixed to form a positive electrode mixture. This positive electrode mixture is dispersed in N-methyl-2-pyrrolidone as a dispersing material to form a slurry. This slurry is applied to a positive electrode current collector 11 made of aluminum, dried and press-formed to form a positive electrode mixture layer 12 as shown in FIG.

A negative electrode mixture is obtained by mixing graphite as a negative electrode active material and polyvinylidene fluoride as a binder. N-methyl-2 as a dispersant using this negative electrode mixture
-Disperse in pyrrolidone to form a slurry. This slurry is applied to a negative electrode current collector 21 made of copper in the same manner as the positive electrode 1, dried, and then press-molded to form a negative electrode mixture layer 22 to obtain a negative electrode 2.

As shown in FIG. 2, the positive electrode 1 and the negative electrode 2 are formed into a sheet shape, and then the negative electrode mixture material 22 formed on the negative electrode current collector 21 and the positive electrode composite material formed on the positive electrode current collector 11 are formed, as shown in FIG. The material 12 is disposed so as to be opposed to the material 12, and is wound with the separator 4 interposed therebetween to form a wound body.

A negative electrode lead 23 is welded to the end of the negative electrode current collector 21 of the wound body, and a negative electrode terminal 6 made of nickel is welded to an end of the negative electrode lead 23. On the other hand, a positive electrode lead 13 is welded to the positive electrode
A positive electrode terminal portion 5 made of aluminum is attached to an end of 3. A safety valve 73 is provided at the positive electrode terminal portion 5.
This electrode body is inserted into the main body 70 and the negative electrode terminal 6
And the positive electrode terminal part 5 are respectively bonded to the main body part 70 to form a battery case bottom and a battery lid, respectively. The electrolytic solution 3 is injected into the case 7.

By the above steps, the size is 18 mm in diameter,
A cylindrical lithium ion secondary battery 100 having a height of 65 mm can be formed.

[0052]

EXAMPLE (Method of Manufacturing Test Battery) A cylindrical electrode battery as an embodiment of the present invention is the above-described cylindrical electrode battery shown in FIG. All batteries of this example were manufactured by the manufacturing method described in the above embodiment. The positive electrode 1 has a positive electrode mixture layer 12 formed by applying and pressing a positive electrode mixture containing lithium nickel oxide as an active material on both surfaces of a conductive sheet 11 made of aluminum. The negative electrode 2 has a negative electrode mixture layer 22 formed by applying and pressing a negative electrode mixture containing carbon on both surfaces of a conductive sheet 21 made of copper. The separator 4 is made of polyethylene having a thickness of 25 μm and has a width in the winding axis length direction larger than that of the region where the electrode mixture layers are applied to both electrodes, and a length in the winding direction longer than both electrodes. It is a porous membrane.

The main body 70 of the case 7 was made of polypropylene.

The electrolytic solution 3 was prepared by using ethylene carbonate / diethyl carbonate = 30/70 as an organic solvent.
Of a mixed solvent of 1 mol / L in 1 L of the organic solvent.
A solution in which iPF ₆ was dissolved as an electrolyte was used.

Example 1 An electrode body was formed such that the outermost peripheral surface of the electrode body was a negative electrode.

(Comparative Example 1) An electrode body was formed such that the outermost peripheral surface of the electrode body became a positive electrode.

Example 2 A 25 μm thick polyethylene terephthalate porous film was used as a separator. Then, the electrode body was formed such that the outermost peripheral surface of the electrode body became a separator.

Example 3 An electrode body was formed such that the outermost peripheral surface of the electrode body became a separator. Then, a Ni plating layer having a thickness of 0.2 μm was formed inside the polypropylene resin case.

(Example 4) An electrode body was formed such that the outermost peripheral surface of the electrode body became a positive electrode. Then, a polyimide film having a thickness of 10 μm was attached to the inside of the polypropylene resin case.

Example 5 An electrode body was formed such that the outermost peripheral surface of the electrode body became a positive electrode. The material of the case was a resin obtained by adding 25% of a copolymer of styrene, vinyl toluene, indene, dicyclopentadiene, methylstyrene, and methylindene to a polypropylene resin.

(Overcharge Test) The batteries of the above Comparative Example and Example were charged at a constant current-constant voltage up to 4.1 V using a charge / discharge device to make a full charge state. Thereafter, the current was further continuously supplied at a constant current of 1 A, an overcharge test of the battery was performed, and the behavior of the battery was observed. The temperature of the outermost surface of the electrode during charging was measured by inserting a thermocouple.

Table 1 shows the results.

[0063]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional perspective view of a cylindrical lithium ion secondary battery of the present embodiment.

FIG. 2 is a schematic explanatory view of an electrode portion of the cylindrical lithium ion secondary battery of the present embodiment.

FIG. 3 is a schematic partial cross-sectional view of a stacked electrode.

[Explanation of symbols]

100: lithium ion secondary battery 1: positive electrode 11: positive electrode current collector 12: positive electrode mixture layer
13: positive electrode lead 2: negative electrode 21: negative electrode current collector 22: negative electrode mixture layer
23: Negative electrode lead 3: Non-aqueous electrolyte 4: Separator 5: Positive terminal 6: Negative terminal 7: Case 70: Main body 90: Stacked electrode 1 ": Positive 2": Negative 4 ": Separator

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ryuichiro Shinkai 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. F-term (reference) 5H011 AA13 CC00 CC02 CC05 CC06 DD01 KK04 5H021 CC04 EE02 EE06 EE07 EE08 EE15 EE16 EE18 HH06 HH10 5H029 AJ12 AK03 AL07 AL12 BJ02 BJ12 BJ14 CJ07 CJ12 EJ02 DJ04EJ12 EJ01

Claims (6)

[Claims] An electrode body comprising a positive electrode having a positive electrode active material layer formed on its surface, a negative electrode, a separator interposed between the positive electrode and the negative electrode, a non-aqueous electrolyte, and the electrode A non-aqueous electrolyte secondary battery including a body and a case having a main body that is a resin molded product containing the non-aqueous electrolyte, wherein the positive electrode active material layer of the positive electrode, the main body of the case, Is a non-aqueous electrolyte secondary battery which is separated and not in direct contact. 2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the separator is made of a material having a melting point of 150 ° C. or higher. 3. The electrode body is a wound electrode body formed by winding the positive electrode, the negative electrode, and the separator, and the outermost peripheral surface of the wound electrode body is the negative electrode, 3. The non-aqueous electrolyte secondary battery according to claim 1, comprising at least one of a separator and the surface of the positive electrode having a surface on which the positive electrode active material layer is not formed. 4. The electrode body is a laminated electrode body formed by laminating the positive electrode, the negative electrode, and the separator in parallel, and both ends of the laminated electrode body are the negative electrode, 3. The non-aqueous electrolyte secondary battery according to claim 1, comprising at least one of a separator and the surface of the positive electrode having a surface on which the positive electrode active material layer is not formed. 5. The separator is made of polybenzimidazole, polyimide, polyetherimide, polyamideimide, polyphenylene sulfide, polyethersulfone, polysulfone, polyetherketone, polymethylpendene, aramid, polyvinylidene fluoride, polyamide, polyethylene. 2. The composition according to claim 1, which is at least one of terephthalate, polybutylene terephthalate, polyphenylene ether, polyarylate, and polyacetal.
5. The non-aqueous electrolyte secondary battery according to any one of claims 1 to 4. 6. The case according to claim 1, wherein the case further comprises an isolation portion made of at least one of a metal, a metal oxide, and a resin having a melting point of 150 ° C. or higher. Non-aqueous electrolyte secondary battery.