JP2002083583A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery having high energy density, a large-sized battery in particular, capable of maintaining battery performance by reliably keeping air-tightness for a long time even if it is used under a severe environment having a high temperature, high humidity, vibration and the like. SOLUTION: An outer package has a projecting part corresponding to a terminal flange part and a shape capable of preventing the free rotation of a terminal, and it is structured so as to be deformable when mounted by the terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure of a battery, and more particularly to a terminal structure of a battery that requires a high degree of hermeticity, such as a nonaqueous electrolyte battery such as a lithium battery.

[0002]

2. Description of the Related Art In recent years, demand for small batteries has been increasing with the advance of technology of portable information terminals and the like. However, on the other hand, stationary batteries and electric vehicles (hereinafter referred to as “uninterruptible power supplies”) installed in computer systems and buildings
A medium to large capacity battery of several tens to several hundreds Ah, such as a battery as a power source for electric vehicles used in electric vehicles such as EVs, has been required. For example, EV batteries are required to have high output characteristics, high energy density that can withstand a large current load of 100 A (amperes) or more, and maintenance-free highly reliable sealing. As battery systems used for these, in addition to lead storage batteries, alkaline batteries such as nickel cadmium storage batteries and nickel-metal hydride storage batteries have been developed. Is also under development.

In order to obtain such high output characteristics, it is required to minimize the electric resistance of the terminal itself, the contact resistance between the terminal and the electrode or the external connection member, and the like. In addition, in order to ensure the highly reliable hermeticity, air-tightness and liquid-tightness of the terminal portion are particularly required. In particular, in lithium batteries,
Extremely high hermeticity is required. That is, in a water-based sealed battery such as the lead battery and the alkaline battery, even if the airtightness is not sufficient and moisture invades or leaks between the inside and outside of the battery, there is no adverse effect on the battery performance. Has no effect. However, in the case of a lithium battery, the invasion of moisture from the outside causes a significant decrease in battery performance. In particular, Li which is an electrolyte salt that gives good battery performance
When PF ₆ or the like is used, the degree of adverse effects due to the intrusion of moisture is extreme. For this reason, a general lithium battery seals a metal battery case can and a lid by laser welding or the like,
Further, in the terminal portion, a material called a hermetic seal, which is obtained by sintering glass or ceramic, is used to make the airtightness perfect. However, laser welding requires a dedicated large-scale device, and hermetic seals use special techniques and are extremely expensive, which has been a serious obstacle in providing lithium batteries at low cost.

Conventionally, various shapes of terminals for alkaline batteries have been proposed. For example, 49-8
Japanese Patent Application Laid-Open No. 8221 proposes a screw-fixed terminal as shown in FIG. 61 is a cover plate made of synthetic resin, 62 is a terminal, and a terminal flange portion 62b and a lead plate of an electrode plate are provided at a lower end of a terminal rod 62a provided with a screw thread 62d for fixing the terminal 62 to the cover body 61. The current collector 62c to be connected is integrally formed by cutting or the like, or is separately formed and integrally formed by welding or the like. Terminal 6
When the material forming 2 is applied to an alkaline battery,
Generally, it is a corrosion-resistant metal such as nickel plating or a nickel alloy on a steel material. The terminal 62 is inserted into a pole insertion hole 61 a provided in the cover plate 61, and a terminal rod 62 a is inserted along with annular insulators 63 a and 63 b made of synthetic rubber or synthetic resin, and provided on the terminal rod 62 a via a metal washer 64. The nut 65 is screwed to the thread 62 d and fixed to the lid 61. In this example, the external terminal is formed by a stepped portion 62e provided above the terminal rod 62a and a terminal screw portion 62f, and a perforated connecting plate is arranged at the stepped portion and can be connected by screwing. In each of the battery systems described above, a method in which the terminal is screwed and fixed to the cover plate as described above is often used, and the use of the integrated terminal reduces the electric resistance from the power generation element to the external terminal portion.

However, such a structure requires complicated operations such as fixing the terminals to the cover plate and processing such as threading of nuts and terminal rods for pressing the annular insulator and tightening of the nuts. For this reason, the applicant of the present application disclosed in Japanese Utility Model Laid-Open Publication No. 54-171143, as shown in FIG. 8, without using the nut 61 for tightening the pole as shown in FIG. Proposed a method of fixing a terminal using an annular spring having a central opening. FIG. 9A is a cross-sectional view of a main part of a side surface of the vented alkaline storage battery disclosed in the publication.
FIG. 2B is a perspective view of the annular spring. The terminal 72 includes a terminal rod 72a, a circular flange-shaped stepped part 72b abutting on the lower surface of the cover plate 71, and a current collecting part 72c.
Reference numeral 2a protrudes outside through an insertion hole 71a provided in the cover plate 71, and a rubber-like annular insulator 73 for keeping the airtight between the terminal rod 72a and the insertion hole 71a is formed in the annular step of the cover plate 71. It is placed on the portion 71b, and a washer 74 is placed on its upper surface. Next, the central opening 75a of the annular spring 75 is inserted into the terminal rod 72a, and press-fitted therethrough, so that the spring upper end 75b is formed in the annular groove 7 provided in the intermediate peripheral edge of the terminal rod 72a.
2d, and is fixed by the elastic force of the annular spring 75 between the stepped portion 72b of the terminal 72 and the cover plate 71.
And the annular insulator 73 held between the washer 74 is pressed and deformed in the radial direction, and the extended portion 73a is brought into contact with the peripheral edge of the terminal rod, and the terminal rod 72a and the insertion hole 71a of the cover plate 71 are The terminal 72 is connected to the cover plate 7 while filling the gap to maintain airtightness.
It is fixed to 1. In addition, the annular spring 75 includes
As shown in FIG. 8B, a notch 7 is formed on the upper end (opening) side.
The provision of 5d improves the spring function.

Furthermore, Japanese Patent Application Laid-Open No. Hei 9-115500 proposes a method using an annular pressing spring called an annular pressing spring. FIG. 9A is a cross-sectional view of a main part of a side surface of the alkaline storage battery shown in the publication, and FIG.
It is the top view and sectional drawing of the said annular press spring 6. FIG. Terminal 2
Is composed of a current collecting portion 2g for connecting a lead plate of an electrode plate, a flange portion 2b having a flat upper surface, and a pole portion 2a projecting perpendicularly to the upper surface 2bf of the flange portion. A projection-shaped rotation preventing portion 4 is provided on the lower surface of the exterior body 1 for engaging with the engaging portion, thereby preventing the terminal 2 from rotating.
Project upward from a terminal hole provided in the lid 71,
Flange upper surface 2bf so as to surround pole portion 2a
An annular packing 3 is arranged between the lower surface of the lid 71 and an annular pressing spring 6 having an opening having a small inner diameter with respect to the outer diameter of the pole portion 2a. Due to the elastic force of the spring 6, the annular packing 3 interposed between the upper surface of the flange portion 2 b and the lower surface of the lid 71 is vertically compressed, and the annular pressing spring 6 is positioned at a position where the terminal 2 can be hermetically fixed to the lid 71. Is locked to the outer peripheral edge of the pole portion 2a, and the battery case is sealed. The annular pressing spring 6 has an opening 6 as shown in FIG.
a, a slope 6d having a cut 6c for generating a pressing force and an outer peripheral flat portion 6 transmitting the pressing force through a lid 71.
b, an opening cutout 6 to be locked on the surface of the pole portion 2a
e.

However, the terminal structure of the prior art is, for example, a capacitor having a capacity of 15 Ah or more and a terminal diameter of 8 mm or more.
When applied to a large battery, there are problems in the following points.

First, in a lithium battery requiring a high energy density, the effect of a large terminal shape on the energy density of the battery cannot be ignored. This is because, when the battery becomes large, a large amount of current is taken out during use. Therefore, it is necessary to use a terminal having a large terminal diameter.

Second, when the terminal diameter is increased as described above, the tightening torque when mounting the terminal or the terminal component is strongly applied, so that the terminals rotate simultaneously in the final stage of the tightening, and In some cases, it was not possible to obtain sufficient tightening, resulting in insufficient airtightness.

Third, unlike a water-based battery, when a conventional terminal structure is used for a non-aqueous battery that requires high airtightness,
There was a problem with the long-term reliability of the airtightness. In particular, a lithium battery requiring a long life, such as an uninterruptible power supply for a building, is required to have a life of 5 to 10 years or more. In particular, there is a problem that the airtightness near the terminals is apt to be reduced in an environment where the temperature changes drastically or in an environment with vibration.

Fourth, the annular pressing spring used in the above-mentioned conventional example may become loose during use in an environment where the temperature changes drastically or in an environment with vibration. In particular, when the terminal diameter becomes large, the area of the outer peripheral flat portion 6b of the annular pressing spring 6 becomes large, and accordingly, the opening cutout 6e becomes the pole portion 2a.
This was due to the increase in the force of penetration.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a battery having terminals capable of ensuring high airtightness without impairing the high energy density of the battery. The purpose is to do.

[0013]

According to a first aspect of the present invention, there is provided a battery according to the present invention, wherein an outer body houses a power generation element, and a terminal is provided in a part of the outer body. In the attached battery, the terminal has a flange portion, and the exterior body has a convex portion capable of at least partially accommodating the terminal flange portion.

In the battery according to the present invention, the flange section may have an elliptical horizontal cross-sectional shape.
A polygon, or a shape composed of a combination of an ellipse and a polygon, and wherein the convex portion has a shape capable of preventing free rotation of the flange portion around a terminal axis. I have.

According to a third aspect of the present invention, the terminal has a property that at least a part of the flange portion can be deformed by a mechanical force.

Further, in the battery according to the present invention, as described in claim 4, the terminal has a physical shape capable of being deformed in a direction to increase an outer diameter of a horizontal cross-sectional shape of the flange portion by a mechanical force. It is characterized by having.

The battery according to the present invention is characterized in that an annular pressing spring is press-fitted into the terminal portion, and the terminal and the annular pressing spring are adhesively fixed.

In the battery according to the present invention, as described in claim 6, an annular pressing spring is press-fitted into the terminal portion, and the terminal and / or the vicinity thereof return from the press-fitting direction of the annular pressing spring. It is characterized in that a fixing member for suppressing the pressure is provided.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited by these descriptions.

The terminal attached to the exterior body may be attached via, for example, an insulator so as to avoid electrical conduction with the exterior body, or may be electrically connected to the exterior body. . The shape of the terminal flange portion housed inside the exterior body is arbitrary. There is no limitation on a portion where the terminal is attached to the exterior body. When the exterior body includes a battery case section and a lid section, it is preferable to attach the terminal to the lid section in that the assembling work is easy.

The terminal 2 used for the positive terminal and the negative terminal is
It is preferable that the conductor be a good corrosion-resistant conductor. For example, aluminum or an aluminum alloy can be used for the positive electrode terminal, and copper, copper alloy, or copper plated with nickel can be used for the negative electrode terminal, but it is not limited thereto. FIG. 1A shows an example of the terminal shape of the present invention.
The terminal 2 includes a disk-shaped flange portion 2b and a pole portion 2a which is formed to project vertically upward from the flange portion 2b and has a threaded portion. An annular groove 2c is formed on the upper surface of the flange portion 2b. Have been. An annular packing 3 is inserted into the annular groove 2c, and insulates the flange 2b from the exterior body 1. Further, an annular pressing spring 6 having an opening having a small inner diameter with respect to the outer diameter of the terminal pole portion 2a is press-fitted from above the terminal rod, and the elastic force of the annular pressing spring 6 moves the annular packing 3 up and down. The annular pressing spring 6 is locked at a position where it can be compressed in the direction and the terminal can be sealed and fixed to the lid, thereby sealing the battery case.

FIG. 6 shows a detailed structure of the annular pressing spring 6. As the material, for example, a stainless steel plate for a spring or a spring steel plate may be used. The annular pressing spring 6
Has an opening 6a whose diameter is slightly smaller than the outer diameter of the terminal pole portion, and is provided with a sloped portion 6d having a notch and an outer peripheral flat portion 6c for applying a pressing force.

Next, a configuration and a method of fixing the terminal to the lid will be described step by step based on an embodiment. The sheet-like positive electrode plate and the negative electrode plate are formed into a long cylindrical shape so that the edge portions of the positive electrode plate and the negative electrode plate protrude from both edge portions of the respective electrode plates via a separator made of a resin microporous film. Winding to obtain a pole group power generating element.

After connecting lead assembly plates to which terminals have been connected in advance to both end portions of the power generating element, the power generating element is placed in an exterior body of a metal case, and the terminals are fixed after positioning. Next, terminal mounting holes,
The terminal is inserted and fixed in a terminal mounting hole of a lid having a cleavage valve and a liquid inlet.

A resin ring 9 is used to insulate the upper surface of the cover which is the exterior body 1 from the outer peripheral flat portion 6c of the annular pressing spring 6, and the annular packing 3 is used to insulate the lower surface of the cover and the flange portion 2b. Use an O-ring. By press-fitting the opening 6a of the annular pressing spring 6 into the pole 2a of the terminal 2 exposed from the lid, the flange 2b
The annular packing 3 between the upper surface and the lower surface of the lid is compressed vertically. The opening cut 6 is formed by the pressing force of the annular pressing spring 6.
e into the surface of the pole portion 2b of the terminal 2, and the opening 6
The terminal 2 is hermetically fixed to the lid, which is the exterior body 1, by locking the “a” to the pole portion 2 a at the position of the bite portion 8.

According to the first aspect of the present invention, the protrusion that can at least partially accommodate the terminal flange portion is, for example, in the case of a battery having two terminals, two protrusions corresponding to each terminal. May be provided, or one convex portion for accommodating two flange portions may be provided.

Examples of the shape of the convex portion include a curved surface, a cone, a cylinder, a rectangular parallelepiped, a prism, a pyramid, and the like, but are not limited thereto. , Can be arbitrarily selected based on factors such as processing cost, appearance design, and the like. However, it is necessary that the convex portion forms a convex portion toward the outside of the exterior body.

According to the conventional method without such a convex portion, when the outer body of the portion to which the terminal is attached is a flat plate, the configuration becomes as shown in FIG. 6B, and a dead space is formed around the flange portion 2b. Occurs. As a result, the volume energy density of the battery is reduced. The larger the battery is, the more the degree is. However, according to the present invention, the dead space around the flange 2b can be reduced as shown in FIG.
0 can be increased, and the volume energy density of the battery can be increased. In addition, since the upper part of the battery is an empty space other than the convex portion that houses the terminal 2 and the terminal flange portion 2b, a battery control circuit and the like can be arranged and housed in that space. Further, since the position of the terminal 2 is regulated by the convex portion, the strength of the pole portion 2a against the force from the side surface is improved.

In particular, when the depth of the convex portion is substantially the same as the height of the flange portion, and / or the upper surface shape of the convex portion is substantially the same as the horizontal sectional shape of the flange portion,
This is preferable in that the energy density can be maximized. For example, the lid may be processed as shown in FIG. 2 to form a projection.

The horizontal cross-sectional shape of the flange portion described in the second aspect is not preferable if it is a perfect circle because free rotation of the flange portion becomes easy. It is not something to be done. For example, a shape in which a cut is made in a part of a perfect circle may be used. The shape of the convex portion may be any shape as long as the terminal prevents rotation of the terminal by 360 degrees or more. For this purpose, the minimum diameter of the convex portion needs to be set smaller than the maximum diameter of the flange portion. Within this range, the combination of the convex portion shape and the horizontal cross-sectional shape of the flange portion is arbitrary. is there. Here, it is preferable that the angle at which the flange portion can rotate without being hindered by the shape of the convex portion is smaller, and it is more preferable that the horizontal cross-sectional shape of the convex portion and the horizontal cross-sectional shape of the flange portion be similar. Most preferably, the similarity ratio is as close to 1 as possible as long as the protrusion does not prevent sufficient accommodation of the flange. For example, the convex portion formed on the lid may be a square as shown in FIG. 3, and the shape of the flange portion 2b may be a substantially square shape with rounded corners.

As described above, by preventing the flange portion of the terminal from rotating more than 360 degrees, for example,
When the terminal connection plate is screwed and fixed to the terminal screw portion, a sufficient force can be applied to the screw tightening, so that a long-term airtightness is achieved, and the screwed portion may be damaged due to vibration during use of the battery. It is possible to reduce the possibility that the sealing performance is reduced. In addition, the terminal can be prevented from rotating at the time of press-fitting of the annular pressing spring or at the time of tightening when connecting the connection bar for assembling the unit cells to the terminal screw portion, which may adversely affect the power generating element. Can be prevented.

The property that at least a part of the flange portion can be deformed by a mechanical force described in claim 3 is effective for further ensuring the airtightness. It is desirable that the mechanical force is a force given when the terminal is attached to the exterior body. For example, when the terminal is inserted into or screwed into the exterior body, or when the terminal is inserted into the exterior body, after the terminal is inserted into the exterior body, when the nut is screwed into the threaded portion exposed on the terminal pole portion exposed outside from the exterior body. , Or by pressing the nut against the outer casing by screwing the nut, but is not limited thereto. Due to the deformation of the flange portion due to the mechanical force, for example, the flange portion presses a part of an exterior body or the like, thereby increasing the airtightness of the terminal attachment portion.

For example, when the annular pressing spring 6 is press-fitted into the pole portion 2a, the outer peripheral side surface of the annular groove 2c on the upper surface of the flange portion 2b may be slightly spread outward.

The means for obtaining such a property is not limited at all, but for example, the flange portion 2
This may be achieved by making the thickness of b smaller than that conventionally used. That is, generally, the thickness of the flange portion is often 20 to 40% of the terminal diameter, but the thickness of the flange portion is set to 20 to 80%. Can be achieved by This method is preferable in that the outer peripheral portion can be expanded without changing the pressing pressure at the time of press-fitting of the annular pressing spring. If it is 20% or less, the strength of the flange portion is insufficient, and if it is 80% or more, the deformation of the outer peripheral portion is small, and the effect of the present invention cannot be sufficiently obtained. Further, this value greatly varies depending on the material, and is preferably set to about 50 to 60% for aluminum or an aluminum alloy, and about 40 to 50% for copper, nickel, iron, or an alloy thereof.

In the vicinity of the portion where the flange portion is deformed,
It is preferable to separately arrange a sealing material in that the airtightness of the terminal attachment portion can be further ensured. further,
When it is necessary to avoid electrical continuity between the terminal and the outer package, it is preferable to use an insulating material, such as a resin sheet, for example, since an insulating effect can be obtained at the same time.

Further, if the deformation is made to increase the horizontal cross-sectional shape of the flange, a part of the outer package is formed around the outer periphery of the flange. In the case of a configuration in which the flange portion is housed so as to cover, the flange portion can press the exterior body covering the outer periphery of the flange portion, so that the airtightness can be increased by a simple method. it can. Also in this case, an arbitrary sealing material may be used for the deformed portion.

FIG. 1 shows an example of a specific embodiment.
Description will be made based on (a). A part of the exterior body 1 is processed and arranged so as to surround the periphery of the flange portion 2b. An insulating sealing material 5 is interposed between the exterior body 1 and the flange portion 2b. By screwing a nut from above into the threaded portion of the pole portion 2a, the terminal 2 is pulled up in a direction to promote external exposure from the exterior body 1. At this time, as shown in FIG. 1 (b), the flange 2b is deformed with the vicinity of a terminal mounting hole provided in the exterior body 1 as a fulcrum in the flange 2b. In this example, the deformation is, for example, a deformation in a direction in which the periphery of the flat flange portion 2b is curved and the bottom surface of the flange portion 2b is concave. Due to the deformation, the sealing material 5 sandwiched between the flange portion 2b and the exterior body 1 is pressed. Thereby, the airtightness of the terminal mounting portion is further ensured.

In the example of this figure, since the annular groove 2c for inserting the annular packing is provided, a deformation occurs around the inner peripheral side of the groove. In this case, the annular groove 2
c also serves as a physical shape that can promote the deformation of the present invention.

FIG. 1C shows an example in which a physical shape for promoting deformation of the flange 2b is further provided near the periphery of the flange 2b. A groove 7 substantially corresponding to the contour of the flange portion 2b is provided near the periphery of the upper surface of the flange portion 2b. The groove 7 may be provided in a similar shape corresponding to the entire circumference of the flange portion 2b, or may be provided in a part thereof. In the case where the flange portion 2b is a perfect circle and has a uniform thickness, if the grooves 7 are provided concentrically, the deformation occurs uniformly, so that uniform airtightness can be obtained with respect to the terminal mounting holes of the exterior body 1. Is preferred. When the horizontal cross-sectional shape of the flange portion 2b is a non-circular shape such as a polygon, a uniform deformation is not always obtained in the groove corresponding to the entire circumference. From this perspective,
It is desirable to appropriately adjust the location, depth, and the like where the physical shape such as the groove 7 is provided.

The method for bonding and fixing the terminal and the annular pressing spring according to claim 5 is not limited at all, and for example, a method such as laser welding or resistance welding can be appropriately selected and used. .

If the material of the terminal is relatively soft in surface hardness, or conversely if the material is very hard in surface hardness, the biting portion of the annular pressing spring rises up after long-term use. Although there is a possibility that the airtightness of the battery may decrease, according to such a configuration, for example, during use of the battery, for example, the internal pressure of the battery may change drastically or significant vibration may be applied. Also, it is possible to prevent the portion of the annular pressing spring from biting into the terminal, so that the airtightness of the terminal portion can be maintained for a long time.

The method for providing the fixing member according to claim 6 is not limited at all, and a method of inserting an annular object corresponding to the outer diameter of the terminal pole portion from above the annular pressing spring may be used. Can be. Here, it is preferable that the annular member is a nut corresponding to a screw provided on the terminal pole portion, since fixing is easy. For example, as shown in FIG. 4, a cap-shaped nut or the like having a U-shaped cross section with internal threads may be used.

Further, it is more preferable that the terminal and the nut are bonded and fixed after the nut is inserted, since the fixing is ensured. The method of bonding and fixing in this case is not limited at all, and for example, a method such as laser welding or resistance welding can be appropriately selected and used.

Further, by using a method in which the terminal connection plate presses and fixes the annular pressing spring by arranging the terminal connection plate on the terminal, the terminal connection plate can also serve as the fixing member. Since the total height of the battery can be kept low, it is preferable in that a battery having a high energy density can be provided. At the same time, compared with the method of disposing the terminal connection plate above the fixing member such as the nut or the like, the conduction path at the time of extracting the current can be shortened, so that the voltage drop due to the terminal portion can be minimized. preferable. Here, in order to securely fix the terminal connection plate, the terminal and the terminal connection plate may be adhered and fixed, or a fixing member may be further inserted from above.

According to such a configuration, since the annular pressing spring can be prevented from being displaced upward, during use of the battery, for example, the internal pressure of the battery may change drastically or significant vibration may be applied. Even so, the slack of the annular pressing spring can be prevented.

[0046]

As described above, according to the present invention, since the exterior body has the convex portion that can at least partially accommodate the terminal flange portion, the volume energy density of the battery can be increased. Thus, the space outside the battery near the terminals can be used effectively.

Further, since the terminals are configured not to rotate freely, the terminals can be securely tightened. Even if an external force is applied to the terminals, no torsional stress is applied to the pole group and the like, so that the internal The occurrence of a short circuit and a decrease in battery performance can be prevented, and the durability of the battery can be maintained for a long time.

Further, since a part of the terminal is configured to be deformed when the terminal is mounted, the airtightness of the terminal mounting portion can be further ensured.

Also, since the annular pressing spring is provided with an adhesive and / or a fixing member so as to prevent the annular pressing spring from rising, the airtightness of the battery can be reliably maintained for a long period of time.

As described above, it is possible to provide a sealed battery which is excellent in airtightness, liquid leakage resistance and terminal fixing strength and can maintain stable performance for a long period of time, and therefore has an extremely large industrial value.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part near a terminal of a battery of the present invention.

FIG. 2 is a perspective view of a main part of a lid of the battery of the present invention.

FIG. 3 is a perspective view of the vicinity of a terminal of the battery of the present invention.

FIG. 4 is a sectional view of a main part near a terminal of the battery of the present invention.

FIG. 5 is a top view and a cross-sectional view of an annular pressing spring.

FIG. 6 is a sectional view of a conventional battery and a battery of the present invention.

FIG. 7 is a sectional view of a main part near a terminal of a conventional battery.

FIG. 8 is a sectional view of a main part near a terminal of a conventional battery and a perspective view of an annular pressing spring.

FIG. 9 is a sectional view of a main part near a terminal of a conventional battery and a top view and a sectional view of an annular pressing spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior body 2 Terminal 2a Paul part 2b Flange part 2c Annular groove 3 Annular packing 5 Seal material 6 Annular pressing spring 7 Groove 10 Power generation element 11 Fixing member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Afufu 2-3-1, Furube-cho, Takatsuki-shi, Osaka F-term in Yuasa Corporation (reference) 5H011 AA02 DD09 5H022 AA09 BB03 BB11 CC02 CC08

Claims (6)

[Claims] Claims: 1. In a battery in which an outer housing houses a power generating element and a terminal is attached to a part of the outer housing, the terminal has a flange portion, and the outer housing has at least the terminal flange portion. A battery having a convex portion that can be partially accommodated. 2. The horizontal cross-sectional shape of the flange portion is an elliptical shape, a polygonal shape, or a combination of an elliptical shape and a polygonal shape, and the convex portion is centered on a terminal axis of the flange portion. 2. The battery according to claim 1, wherein the battery has a shape capable of preventing the free rotation. 3. The battery according to claim 1, wherein the terminal has a property that at least a part of the flange portion can be deformed by a mechanical force. 4. The battery according to claim 3, wherein the terminal has a physical shape that can be deformed by a mechanical force in a direction to increase an outer diameter of a horizontal cross-sectional shape of the flange portion. 5. The battery according to claim 1, wherein an annular pressing spring is press-fitted into the terminal portion, and the terminal and the annular pressing spring are bonded and fixed. 6. An annular pressing spring is press-fitted into the terminal portion, and a fixing member is provided near the terminal and / or in the vicinity thereof so as to prevent the annular pressing spring from returning from the press-fitting direction. Item 6. The battery according to any one of Items 1 to 5.