JP2002100328A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery having plural electrode bodies which are down- sized and light-weighted, and which can be produced at a low cost. SOLUTION: This battery is characterized that it has the plural electrode bodies 1 to possess both a positive electrode and a negative electrode, a battery container 3 consisting of a water permeability resistant material to air-tightly retain the plural electrode bodies 1 inside, and an insulating wall member 2 which is arranged inside of the battery container 3 and wherein plural battery cell chambers 21 to separately house the plural electrode bodies 1 to each other are composed of partitioned insulators. Because in the battery of the present invention the battery container to show the water permeability resistance and the insulating wall member to exert an electric insulation are not integrally formed, an enlargement of a size of the battery and an elevation of cost necessary for manufacturing can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery, and more particularly, to a battery having a resin battery case.

[0002]

2. Description of the Related Art In recent years, environmental pollution has become a major problem on a global scale, and in particular, exhaust gas from automobiles is known as one of the sources of air pollution. For this reason, an electric vehicle is being developed as one of the vehicles that do not emit exhaust gas.

[0003] Electric vehicles are driven by electric power. In addition to battery performance such as high energy density and high output density, they also have long life, high reliability, and are maintenance-free. Therefore, secondary batteries such as lead batteries, Ni-Cd batteries, and Ni-hydrogen batteries have been developed.

Recently, a non-aqueous electrolyte secondary battery having a higher battery voltage and a higher energy density than conventional batteries has attracted attention as a driving power source. Non-aqueous electrolyte secondary batteries have already been put into practical use as power supplies for cordless electronic devices such as video cameras and mobile phones. Further, since high power density, long life and maintenance-free operation are possible, application research of this non-aqueous electrolyte secondary battery to a power supply for driving an electric vehicle is also being conducted.

[0005] Non-aqueous electrolyte secondary batteries that are currently in practical use include, for example, a lithium battery using a lithium composite oxide such as lithium cobalt oxide as a positive electrode and carbon capable of inserting and removing lithium as a negative electrode. Ion secondary batteries.

In this non-aqueous electrolyte secondary battery, when moisture is present inside the battery, the moisture and the non-aqueous electrolyte react to generate hydrofluoric acid, and the generated hydrofluoric acid corrodes the electrodes, and There is a problem that performance such as capacity and battery life is reduced.

As described above, in a non-aqueous electrolyte battery,
Since it is important to ensure airtightness (ingress of moisture from the outside), it is important to suppress the invasion of moisture from the outside.
Such metals are used.

However, when a metal material is used for the battery container, there is a disadvantage that the weight of the battery increases. Further, when an assembled battery is configured by arranging a plurality of batteries, the weight of the battery container alone is considerable.

On the other hand, a lead battery using an aqueous electrolyte, Ni
As the -Cd battery and the Ni-hydrogen battery, many batteries having a monoblock structure capable of accommodating a plurality of electrode bodies using a resin container have been proposed. However, when the battery having such a monoblock structure is exposed to a high-temperature and long-term use environment such as a state in which the battery is mounted on an automobile, the moisture of the electrolytic solution passes through the resin case and dissipates into the air, There is a problem that the life degradation is promoted by the increase in the electrolyte concentration.

[0010] For this reason, in view of the demand for further weight reduction and cost reduction, the use of a resin container is being studied for non-aqueous electrolyte batteries. For this reason, a battery having a resin container that does not allow moisture to permeate has been developed.

As a battery having a resin container that does not allow moisture to permeate, for example, Japanese Utility Model Laid-Open Publication No. Hei 6-70152 discloses a monoblock battery case made of plastic and a thin metal layer formed on at least the inner surface of the battery case. A monoblock battery case type organic electrolyte battery is disclosed in which a partition wall of the battery case has a partition penetrating conductive portion electrically insulated from the partition wall. This thin metal layer is formed by applying a plating method or a sputtering method to the inner surface of the battery case.

However, in the method of forming a thin metal layer on the inner surface of the container, the inner wall of the container and each electrode must be electrically insulated so that the positive electrode and the negative electrode do not short-circuit. It is difficult to form a thin metal layer so that there is no pinhole on the resin surface because the structure of the resin becomes complicated and it is difficult for the resin and metal to adhere to each other, and moisture may permeate the battery case. And the cost of forming the thin metal layer is high.

Japanese Patent Application Laid-Open No. 61-13550 discloses a method in which a gel electrolyte is provided, or an electrolyte is impregnated only in a negative electrode plate and a porous separator disposed between and around the two electrode plates. Among the held sealed lead-acid batteries, there has been disclosed a sealed lead-acid battery characterized in that a metal body is embedded in the inside of a battery case and the inside of a lid of a synthetic resin.

However, the method of embedding the metal body in the resin case and the lid has a problem that the cost for manufacturing the case in which the metal body is embedded is high.

Japanese Patent Application Laid-Open No. Hei 5-21045 discloses that
A sealed battery including a negative electrode mainly composed of a hydrogen storage alloy and a battery case made of a synthetic resin, comprising a nonporous metal layer on the surface of the battery case is disclosed. Have been.

However, in the method of providing a metal layer on the surface of the resin case, it is necessary to perform processing for providing the metal layer on the surface of the resin case, and there is a problem that the cost for manufacturing the case increases. There was a problem that the cost was high because the cost was high.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a battery having a plurality of electrode bodies which is small, lightweight, and can be manufactured at low cost.

[0018]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have repeatedly studied a battery having a plurality of electrode bodies, and as a result, the plurality of electrode bodies have been separated by a partition member having electrical insulation. It has been found that the above problem can be solved by using a battery held in a water-permeable battery container in this state.

That is, the battery of the present invention comprises a plurality of electrode bodies having a positive electrode and a negative electrode, a battery container made of a water-permeable material for hermetically holding the plurality of electrode bodies inside, and a battery container formed inside the battery container. And a partition member made of an insulating material in which a plurality of battery cell chambers accommodating the plurality of electrode bodies in a state of being isolated from each other are formed.

In the battery of the present invention, since the plurality of electrode bodies are sealed in a battery container made of a water-permeable material in a state of being separated from each other by the partition member, the electrode body is formed by allowing moisture to permeate the battery container. , The deterioration of the charge-discharge characteristics is suppressed, and a short circuit between the electrode bodies does not occur. As a result, the battery of the present invention can suppress a decrease in battery performance and exhibit high battery performance with a long life.

In addition, since the battery container exhibiting water permeability and the partition member exhibiting electrical insulation are not integrally formed, the size of the battery is prevented from becoming coarse, and the cost required for manufacturing is increased. Can be suppressed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION A battery of the present invention has a plurality of electrode bodies, a partition member, and a battery container.

The electrode body has a positive electrode and a negative electrode. The positive electrode and the negative electrode of the electrode body are not particularly limited,
An electrode used for a normal battery can be used. Further, the number of electrode bodies is not particularly limited, and can be appropriately determined based on characteristics required for the battery. In general, as the number of electrode bodies increases, the size and weight can be reduced as compared to a battery having the same characteristics having one electrode body.

Preferably, the plurality of electrode bodies are connected in series or in parallel. By connecting a plurality of electrode bodies in series or in parallel, power can be obtained from the battery with high output or long life.

The arrangement of the plurality of electrode bodies is not particularly limited, and may be appropriately selected according to conditions such as the shape of the electrode body and cooling efficiency for cooling the electrode body caused by charging and discharging. Is preferred.

The electrode body is preferably a flat-type wound electrode body in which a strip-shaped positive electrode and negative electrode are wound in a flat shape with a separator interposed therebetween. By making the electrode body a flat wound electrode body, the energy volume density of the electrode body increases, and the power characteristics of the battery improve. Further, in the flat wound electrode body, since the electrode body can be downsized, it is possible to suppress an increase in the size of the battery. In the present invention,
The electrode body is preferably a flat wound electrode body, but the electrode body may be a laminated electrode body in which other electrode plates are laminated.

As the strip-shaped positive electrode, negative electrode and separator which constitute the electrode body, members used for ordinary electrode bodies can be used. For example, as the positive electrode, one obtained by applying a positive electrode active material such as lithium manganese oxide to the surface of a strip-shaped aluminum foil, and as the negative electrode, one obtained by applying a negative electrode active material such as graphite to the surface of a copper foil, As the negative electrode, a strip-shaped microporous resin film can be used. The separator may be partly or wholly integrated with the surface of the strip-shaped positive or negative electrode by fusing or the like.

The battery case is a member made of a water-permeable material that holds a plurality of electrode bodies in an airtight manner. High battery performance can be maintained by holding a plurality of electrode bodies inside in an airtight manner. That is, by maintaining the plurality of electrode bodies in an airtight manner, the electrolyte and the like do not leak from the electrode bodies, and the battery performance is maintained. In addition, since the electrolyte and the like do not leak, the battery can be easily handled.

Since the battery container has water resistance, it is possible to suppress the permeation of moisture through the battery container, and to suppress a decrease in battery performance due to the permeation of moisture. That is, when the electrolytic solution is an aqueous solution, the electrolytic solution permeates through the battery container and the concentration of the electrolytic solution increases, thereby deteriorating the battery performance. When the electrolytic solution is organic, moisture permeates from the outside through the battery container. Intrusion is suppressed. Examples of the material having water resistance include metal. The type of metal that forms the battery container is not particularly limited, but Ni-plated steel sheet, stainless steel, aluminum, and the like are more preferable in terms of advantages such as light weight, low cost, and durability.

The partition member is a member made of an insulating material which is disposed inside the battery container and which divides a plurality of battery cell chambers for accommodating a plurality of electrode bodies in a state of being separated from each other. The partition member is arranged in the battery container, and by accommodating the plurality of electrode bodies in a state of being separated from each other, contact between adjacent electrode bodies,
The occurrence of a short circuit due to the movement of the electrolytic solution or the like is prevented, and a decrease in battery performance is suppressed.

A plurality of battery cell chambers are defined in the partition member,
By accommodating the electrode body in this battery cell chamber, it becomes easy to hold the plurality of electrode bodies in a state of being isolated from each other. Here, the battery cell chamber is formed so that the electrode body does not protrude outside the battery cell chamber when the electrode body is accommodated in the battery cell chamber.

Since the partition member is made of an insulating material, when the electrode body is housed in the battery cell chamber, the electrode body can be held in the battery container without causing a short circuit between adjacent electrode bodies. The insulating material forming the partition member is preferably a resin. That is, a general resin has electrical insulation properties and is excellent in its moldability, so that the battery cell chamber can be easily formed. The material of the resin used as the partition member is not limited as long as it is corrosive to the electrolytic solution, and examples thereof include polypropylene and polyethylene.

Since the battery of the present invention has a partition member in the battery container, it is not necessary for the battery container to form a partition for isolating the electrode body, and the structure can be simplified. The cost for forming the container can be reduced.

Preferably, the battery cell chamber is partitioned into a concave shape having an opening on the surface of the partition wall member. The storage of the electrode body is facilitated by partitioning the battery cell chamber into a concave shape. That is, since the battery cell chamber is partitioned in a concave shape, the electrode body can be accommodated in the battery cell chamber by inserting the electrode body from the opening.

Here, it is preferable that the battery cell chamber is partitioned into a shape along the outer peripheral shape of the electrode body. Examples of the shape along the outer peripheral shape of the electrode body include a rectangular parallelepiped space shape and a racetrack space shape. The partitioning into a rectangular parallelepiped facilitates the formation of the partition member. That is, since the width of the battery cell chamber does not change from the opening, no extra cost is required when the partition member is formed of resin or the like. Further, no extra space is formed between the outer peripheral surface of the electrode body and the inner peripheral surface of the battery cell chamber, and it is possible to prevent the electrolyte from being injected more than necessary.

Preferably, the openings of the plurality of battery cell chambers are formed on the same surface of the partition member. Since the plurality of openings are formed on the same surface of the partition member, the plurality of electrode bodies can be easily housed in the battery cell chamber.

The partition member preferably has at least the opening of the battery cell chamber in close contact with the inner peripheral surface of the battery container. Since the opening is in close contact with the inner peripheral surface of the battery container, the battery cell chamber is in a sealed state, and the movement of a substance between adjacent battery cell chambers is suppressed. That is, since the battery cell chamber in which the electrode body is sealed is sealed, a substance such as an electrolyte does not move between the battery cell chambers, and a decrease in battery performance is suppressed.

It is preferable that the partition member is disposed in close contact with the inner peripheral surface of the battery container. By disposing the partition member in close contact with the inside of the battery container, a member for holding the partition member is not required, and it is possible to suppress an increase in the size and cost of the battery.

It is preferable that the battery container comprises a bottomed box-shaped battery case with one opening and the other closed, and a lid for sealing one opening. Since the battery case includes the battery case and the lid, the electrode body and the partition member can be easily held in the battery case. In addition, by forming the battery container from the battery case and the lid, complicated processing is not required for forming the battery container, and the battery container can be manufactured at low cost.

Examples of the means for sealing the battery container include a method of laser welding and a method of clamping a resin gasket when sealing the battery case with a lid. . The means for sealing the battery container in the present invention is not limited to these means.

The battery case is preferably formed in a rectangular parallelepiped bottomed box shape. When the battery case is formed in a rectangular parallelepiped bottomed box shape, the flat wound electrode body and the laminated electrode body can be efficiently held inside, and the volumetric efficiency of the battery increases.

A non-aqueous electrolyte battery is preferred. That is, the non-aqueous electrolyte battery is a battery that can have a high energy density and a long life, and the battery of the present invention can be reduced in size and improved in performance. For example, here, the battery of the present invention is:
Non-aqueous electrolyte batteries are preferred, but lead batteries, Ni
It does not exclude that the battery is used as a conventional battery such as a Cd battery.

In the battery of the present invention, since a plurality of electrode bodies are sealed in a battery container made of a water-permeable material in a state where they are isolated from each other by a partition member, the size of the battery is prevented from becoming coarse, and the battery is manufactured. Increase in cost required for the operation can be suppressed.

[0044]

The present invention will be described below with reference to examples.

As an example of the present invention, an assembled battery containing four electrode bodies was prepared.

(Embodiment) The embodiment is a battery accommodating the four electrode bodies shown in FIGS. Here, FIG. 1 is a perspective view of the battery of the embodiment, FIG. 2 is a cross section of the battery of the embodiment, FIG. 3 is a cover 32 to which the electrode body 1 is fixed, and FIG. FIG. 6 is a view showing a battery case 31 that has been removed.

More specifically, the battery of the first embodiment includes an electrode body 1,
It comprises a partition member 2, a battery container 3, a positive electrode terminal 4, and a negative electrode terminal 5.

The electrode body 1 was a flat wound electrode body formed by winding a positive electrode sheet and a negative electrode sheet into a flat wound shape with a separator interposed therebetween. The electrode body is
It was formed to have a width of 114 mm, a height of 80 mm, and a thickness of 15.4 mm.

The positive electrode sheet is a sheet in which a positive electrode active material layer made of lithium manganese oxide or the like is formed on both surfaces of a current collector made of a strip-shaped aluminum foil. The positive electrode sheet contains 86 wt% of Li _1.12 Mn _1.88 O ₄ of the positive electrode active material,
Conductive agent graphite 10wt%, binder PV
A paste was prepared by mixing DF in a solvent of N-methyl-2-pyrrolidone at a ratio of 4% by weight, this paste was applied to both sides of an aluminum foil, dried and rolled, and the positive electrode active in the length direction. It was formed by cutting so as to leave the peripheral portion where the material layer was not formed, and drying by heating under vacuum.

The negative electrode sheet is a sheet in which a negative electrode active material layer made of graphite or the like is formed on both surfaces of a current collector made of a strip-shaped copper foil. The negative electrode sheet was prepared by mixing 92.5 wt% of graphite as the negative electrode active material and 2.5 wt% of PVDF as the binder in N-methyl-2-pyrrolidone to prepare a paste in the same manner as in the positive electrode sheet 6. ,
This paste was applied to both sides of a copper foil, rolled after drying, cut so as to leave an edge portion where the negative electrode active material layer was not formed in the length direction, and dried by heating under vacuum.

The separator was a microporous polyethylene film formed wider than the portions of the positive electrode sheet and the negative electrode sheet where the electrode active material layers were formed.

The electrode body 1 is formed in an opal shape with the respective edges of the positive electrode sheet and the negative electrode sheet protruding in directions opposite to each other in the axial length direction of the winding shaft, and the positive electrode sheet and the negative electrode sheet are interposed with a separator therebetween. After being wound, it was formed into a flat shape. The electrode body 1 was compression-molded at the edges protruding in the directions facing each other in the axial direction of the winding shaft, so that a protruding end was formed.

The partition member 2 is a battery cell chamber 21 for accommodating the electrode body 1 formed in a substantially rectangular parallelepiped shape and having an opening on the upper surface.
Is a member divided into four so as to be arranged two by two in the width direction and two by two in the thickness direction and separated from each other by the partition wall portion 22. The partition member 2 was formed of polypropylene. The opening of the battery cell chamber 21 is 16 mm ×
It was formed in a concave shape with a depth of 115 mm and a depth of 85 mm. Further, the thickness of the partition wall 22 for isolating the respective battery cell chambers 21 and the wall 23 in contact with the battery case 31 was 1 mm. The partition member 2 is arranged in a state in which the bottom surface and the side surface are in close contact with each other inside the battery case 31.

The battery case 3 is composed of a battery case 31 and a lid 32, and is a member for sealing the electrode body 1 and the partition member 2 inside the battery case 31 and the lid 32.

The battery case 31 is a member having a substantially rectangular parallelepiped outer peripheral shape and formed in a tank shape with an open top. The battery case 31 is formed in a tank shape with a plate thickness of 0.5 mm from stainless steel. The inside of the battery case 31 is also formed in a substantially rectangular parallelepiped shape.

The lid 32 was formed so as to seal the opening on the upper surface of the battery case 31. Further, the lid 32 is held in a state where the positive electrode terminal and the negative electrode terminal penetrate. Also,
The lid 32 was also formed of stainless steel having a thickness of 0.5 mm similarly to the battery case 31.

The positive electrode terminal 4 and the negative electrode terminal 5 are joined to the protruding ends of the electrode body 1 protruding in the axially opposite directions. The positive electrode terminal 4 is made of a rod-shaped member made of aluminum, and the negative electrode terminal 5 is made of a rod-shaped member made of copper. The contact portions of the positive electrode terminal 4 and the negative electrode terminal 5 with the protruding ends were formed smoothly, and the contact portions were joined by ultrasonic welding.

The positive electrode terminal 4 and the negative electrode terminal 5 joined to the electrode body 1 are fixed in a state where they penetrate the lid 32 and the terminal portions 41 and 51 protrude. Here, the positive electrode terminal 4 and the negative electrode terminal 5 are fixed to the lid 32 in an airtight manner with an insulating material interposed therebetween.

Also, a terminal portion 41 protruding from the lid 32,
Reference numeral 51 denotes a connection terminal (not shown) in which the respective electrode bodies are electrically connected in series. (Manufacturing Method) In the battery of Example 1, the electrode body 1 is formed, the positive electrode terminal 4 and the negative electrode terminal 5 are joined to the electrode body 1, and the positive electrode terminal 4 and the negative electrode terminal 5 are fixed to the lid 32. Subsequently, the partition member 2 is inserted and fixed inside the battery case 31.

Thereafter, after 50 g of the electrolyte is injected into the battery cell chamber 21 of the partition member 2, the battery case 31 is covered with the lid 32. At this time, the lid 32 was placed over the battery case 31 so that the electrode body 1 was inserted into the battery cell chamber 21 of the partition member 2. After that, the contact portion between the battery case 31 and the lid 32 was sealed by laser welding.

As the non-aqueous electrolyte, an electrolytic solution in which LiPF ₆ was dissolved at a ratio of 1 mol / l in a mixed solvent of ethylene carbonate and diethyl carbonate at a volume ratio of 3: 7 was used.

(Comparative Example 1) The battery of Comparative Example 1 was a battery in which four electrode bodies were held in a resin battery container.

The battery of Comparative Example 1 was the same as the battery of Example except that the battery container was a resin battery container. Specifically, the battery container of Comparative Example 1 is made of polypropylene having a thickness of 2 mm, and includes a battery case in which four battery cell chambers are formed, and a lid for sealing the battery case. Comparative Example 1
Also in the battery of Example 1, the arrangement of the electrode bodies was the same as that of Example 1.

In the battery of Comparative Example 1, an electrode body was formed in the same manner as in the Example, and the battery was fixed to the lid using the positive electrode terminal and the negative electrode terminal. Thereafter, with 50 g of the electrolytic solution injected into each battery cell chamber of the battery case, the opening of the battery case is covered with a lid so that the electrode body is inserted into the battery cell room. The joint between the lid and the battery case was joined by heat fusion.

(Comparative Example 2) The battery of Comparative Example 2 is an assembled battery in which four unit cells each having an electrode body sealed in a metal battery container are combined.

As a unit cell constituting the assembled battery of Comparative Example 2, a battery container constituted by a battery case and a lid formed of stainless steel having a plate thickness of 0.5 mm was used. In the battery of Comparative Example 2, the same members as those of the battery of Example were used except for the battery container.

That is, the electrode body formed in the same manner as in the embodiment is fixed to the lid via the positive electrode terminal and the negative electrode terminal, and the battery case and the lid are inserted in a state where the electrode body is inserted into the battery container into which the electrolytic solution has been injected. A battery formed by laser welding the body.

(Evaluation) The batteries of Examples and Comparative Examples were
After leaving at 0 ° C. and a relative humidity of 90% for one week, the amount of water contained in the electrolytic solution was measured by the Karl Fischer method. Table 1 shows the measurement results. Also, according to Table 1,
The weight ratio of each battery when the weight of the battery of the example is 100 is also shown.

[0069]

[Table 1]

Table 1 shows that in the batteries of the examples, no water had penetrated into the electrolytic solution. Further, the battery of Comparative Example 1 used a resin battery container, so that the weight of the battery was reduced, but a large amount of water of 22,000 ppm was detected from the electrolytic solution. In the battery of Comparative Example 2, moisture was not detected from the electrolytic solution, but the weight of the battery was heavy because a unit cell having a metal battery container was combined.

Thus, the batteries of the embodiments can be reduced in weight, and at the same time, the permeation of moisture through the battery container is suppressed, and the deterioration of the battery performance is suppressed.

[0072]

According to the battery of the present invention, since a plurality of electrode bodies are sealed in a battery container made of a water-permeable material in a state of being separated from each other by a partition member, moisture is transmitted through the battery container. A decrease in the charge / discharge characteristics of the electrode body is suppressed, and a short circuit between the electrode bodies does not occur. As a result, the battery of the present invention can suppress a decrease in battery performance and exhibit high battery performance with a long life.

Further, since the battery container exhibiting water resistance and the partition member exhibiting electrical insulation are not integrally formed, the size of the battery is prevented from becoming large, and the cost required for manufacturing is increased. The effect can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a battery of an example.

FIG. 2 is a diagram showing a cross section of a battery of an example.

FIG. 3 is a view showing a state in which an electrode body is fixed to a lid in the battery of the embodiment.

FIG. 4 is a view showing a state where a partition member is inserted into a battery case in the battery of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrode body 2 ... Partition member 3 ...
Battery container 4 Positive electrode terminal 5 Negative electrode terminal 21 Battery cell room 22 Partition wall 23
... wall 31 ... battery case 32 ... lid

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyasu Takeuchi 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 5H011 AA04 CC00 FF02 5H028 AA07 BB07 CC01 CC07 CC08 CC12 CC24 5H040 AA02 AS07 AT06 AY06

Claims (6)

[Claims] 1. A plurality of electrode bodies each having a positive electrode and a negative electrode; a battery container made of a water-permeable material that holds the plurality of electrode bodies in an airtight manner; A plurality of battery cell chambers accommodating the electrode bodies in a state of being separated from each other; 2. The battery according to claim 1, wherein the battery cell chamber is partitioned into a concave shape having an opening on a surface of the partition member. 3. The battery according to claim 2, wherein the partition member has at least the opening of the battery cell chamber in close contact with an inner peripheral surface of the battery container. 4. The battery according to claim 1, wherein the partition member is disposed in close contact with an inner peripheral surface of the battery container. 5. The battery according to claim 1, wherein the electrode body is a flat wound electrode body in which a belt-like positive electrode and a negative electrode are wound in a flat shape with a separator interposed therebetween. 6. The battery according to claim 1, which is a non-aqueous electrolyte battery.