JPH07235289A - Sealed electrode terminal structure - Google Patents

Abstract

PURPOSE:To provide a sealed electrode terminal structure which has high insulation, high airtightness, and is capable of satisfying suitable electrical performance on the inside of a battery and suitable welding with a lead tab on the outside of the battery. CONSTITUTION:A cylindrical body 2b of a first electrode pin 2 arranged on the inside of a battery are inserted into a hole 5a of a synthetic resin cylindrical body 5 and a hole of an insulating film 4, and a pillar part 3b of a second electrode pin 3 arranged on the outside of the battery is inserted into a hole 2a of the cylindrical body 2b of the first electrode pin 2. By pressing the first electrode pin 2 and the second electrode pin 3 from both sides of a plate, an insulating film 4, the synthetic resin cylindrical body 5, and a battery outer jacket container 6 are compressed to airtightly seal the hole of the outer jacket container 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive electrode or negative electrode terminal structure which is arranged to penetrate a battery outer container in a sealed battery, and is particularly excellent in insulation and airtightness.
The present invention relates to a sealed electrode terminal structure capable of satisfying both suitable electric characteristics inside the battery and suitable weldability with a lead tab outside the battery which are required as a material for the electrode terminal.

[0002]

2. Description of the Related Art Recently, small and cordless portable electronic devices such as portable telephones, portable notebook computers, and video movies have been remarkably spread. For such equipment, non-aqueous electrolyte batteries such as lithium batteries and lithium ion secondary batteries, which are small in size and have a high capacity, have been widely used.

[0003]

However, in such a non-aqueous electrolyte battery, due to its high electromotive force, for example, a positive electrode terminal contains titanium, molybdenum, etc. as its material. Only limited materials such as special stainless steel, gold, platinum and aluminum could be used. Further, in the case of a hermetically sealed system battery in which this positive electrode terminal is provided by penetrating a battery outer container consisting of a battery lid or a battery can, and a fused glass that requires high hermeticity is used, the material of the electrode terminal is It is necessary to have a value close to the coefficient of thermal expansion of the fused glass, which limits the material to special stainless steel containing titanium, molybdenum and the like.

However, both titanium and special stainless steel have a great difficulty in workability and weldability for wiring to electrode terminals outside the battery.

Therefore, in the present invention, it is an object of the present invention to realize a sealed electrode terminal structure capable of satisfying both favorable electric characteristics inside the battery and favorable weldability with the lead tab outside the battery. And

[0006]

In order to achieve the above-mentioned object, in the sealed electrode terminal structure of the present invention, a cylindrical body which can be housed in a hole formed in a battery outer container is protruded from a plate body. And a second electrode pin formed by projecting a columnar body having a diameter that can be accommodated in the cylindrical body of the first electrode pin from the plate body, and the hole portion of the battery outer container is inserted. The columnar body of the second electrode pin is inserted into the cylindrical body of the first electrode pin, and the first electrode pin and the second electrode pin press-contact the battery outer container to hold the hole of the battery outer container. Is hermetically sealed.

Alternatively, a synthetic resin cylindrical body housed in a hole formed in the battery outer case and a hole provided in both sides of the battery outer case corresponding to the hole of the battery outer case. An insulating film having a perforated portion, a first electrode pin formed by projecting a cylindrical body that can be stored in the synthetic resin cylindrical body from a plate body, and can be stored in the cylindrical body of the first electrode pin A cylindrical body of the first electrode pin, which comprises a second electrode pin formed by projecting a columnar body having a different diameter from a plate body, and which is inserted through the hole of the synthetic resin cylinder and the hole of the insulating film. To the second
The columnar body of the electrode pin was inserted, and the insulating film, the synthetic resin cylinder and the battery outer container were pressed and sandwiched by the first electrode pin and the second electrode pin to hermetically seal the hole of the battery outer container. It is characterized by that.

A hollow portion may be formed in the columnar body of the second electrode pin.

Further, the first electrode pin and the second electrode pin are pressed against both sides to deform the cylindrical body of the first electrode pin and the columnar body of the second electrode pin so that they are engaged with each other. You may let me.

Alternatively, the cylindrical body of the first electrode pin and the columnar body of the second electrode pin may be screwed to engage with each other.

[0011]

A first electrode pin having a cylindrical body that can be housed in a hole formed in a battery outer container and projecting from a plate body, and a diameter that can be housed in the cylindrical body of the first electrode pin. The second electrode pin formed by projecting a columnar body from the plate body, and the second electrode pin inside the cylinder of the first electrode pin inserted through the hole of the battery outer container.
The columnar body of the electrode pin is inserted and the first electrode pin and the second electrode pin sandwich the battery outer container under pressure to hermetically seal the hole of the battery outer container, thereby providing the sealed electrode of the present invention. The terminal structure may be a two-piece structure in which a material having an optimum electrical property inside the battery and a material having an optimum weldability outside the battery are appropriately combined.

[0012] A synthetic resin cylindrical body housed in a hole formed in the battery outer container, and a hole portion provided on both surfaces of the battery outer container and corresponding to the hole of the battery outer container. An insulating film formed by punching, a first electrode pin formed by projecting a cylindrical body that can be stored in the synthetic resin cylindrical body from a plate body, and a diameter that can be stored in the cylindrical body of the first electrode pin. A second electrode pin formed by projecting a columnar body formed of a plate body from the plate body, and the second electrode pin is inserted in the hole of the synthetic resin cylinder and the hole of the insulating film. The columnar body of the second electrode pin is fitted and inserted, and the insulating film, the synthetic resin cylinder and the battery outer container are pressed and sandwiched by the first electrode pin and the second electrode pin to hermetically seal the hole of the battery outer container. By stopping, the sealed electrode terminal structure of the present invention is a battery without using fused glass. While being surely insulated from the packaging container, the hole of the battery outer container can be sealed with excellent airtightness, and the sealing electrode terminal has a two-piece structure of the first electrode pin and the second electrode pin. Therefore, the material having the optimum electric characteristics inside the battery and the material having the optimum weldability outside the battery can be appropriately combined and selected.

[0013]

1 is an exploded view showing a first embodiment of a sealed electrode terminal structure of the present invention, FIG. 2 is a sectional view in an assembled state, 1 is a sealed electrode terminal structure of the present invention, and 2 is a sectional view. Is a plate 2c formed on the upper end of a cylinder 2b having a hole 2a, and the first electrode pin 3 is arranged inside the battery. 3 is a plate 3c formed on the upper end of a columnar body 3b having a hollow 3a. The second electrode pin 4 disposed on the outside of the battery is made of polyparaphenylene terephthalamide (PPTA aramid) having a hole 4a, polyimide, etc., which has high strength and is excellent in heat resistance and chemical resistance. A film, 5 is a cylindrical body made of synthetic resin having an insulating property and having a hole portion 5a, and 6 is a battery outer container including a battery lid or a battery can having a through hole 6a.

The first electrode pin 2 has a cylindrical body 2b having an outer diameter smaller than that of the through hole 6a of the battery outer casing 6 and substantially the same as or slightly smaller than the inner diameter of the synthetic resin cylinder 5 so that the synthetic resin cylinder is It can be housed in the body 5, and the length of the cylindrical body 2b is made slightly larger than the total thickness of the battery outer case 6 and the insulating film 4. Further, the outer diameter of the plate body 2b is the through hole 6
It shall be larger than a.

The second electrode pin 3 can be housed in the hole 2a of the first electrode pin 2 by making the outer diameter of the columnar body 3b smaller than the inner diameter of the hole 2a of the first electrode pin 2. At the same time, the length of the columnar body 3b is made substantially the same as the depth of the hole 2a of the first electrode pin 2. The outer diameter of the plate body 3c is made larger than that of the through hole 6a of the battery outer case 6, and the plate body 3c at the base end portion of the columnar body 3b is provided with a groove 3d obliquely so as to become deeper toward the center. Has been formed.

When the battery is a non-aqueous electrolyte lithium battery or a lithium ion secondary battery, when the sealed electrode terminal of the present invention is a positive electrode, the first electrode pin 2 disposed inside the battery is used. Aluminum, aluminum alloys, titanium, special stainless steel containing molybdenum, etc. are suitable as the material of, and aluminum and aluminum alloys are particularly suitable because they are excellent in electrical characteristics, workability and inexpensive, and also battery Nickel, nickel-plated copper, or nickel-plated steel plate is most suitable as the material of the second electrode pin arranged on the outside of the above in terms of workability and welding with the nickel lead tab. Then, the material of the battery outer case 6 that serves as the negative electrode is stainless steel, nickel-plated steel plate, or the like.

On the other hand, when the sealed electrode terminal of the present invention is used as a negative electrode, the material of the first electrode pin 2 disposed inside the battery is copper, nickel, nickel-plated copper, or nickel-plated steel plate. Suitable, especially electrical properties, processability,
Copper, which has excellent weldability, is suitable. The material of the second electrode pin 3 arranged outside the battery is nickel,
Nickel-plated copper and nickel-plated steel sheets are preferable in terms of workability and welding with a nickel lead tab. And
As the material of the battery outer container 6 which becomes the positive electrode, special stainless steel containing aluminum, aluminum alloy, titanium, and molybdenum is preferable, and particularly, electrical characteristics,
Aluminum is the most suitable in terms of workability and economy.

Then, the through holes 6a of the battery outer case 6 are communicated with each other, and the insulating films 4 are disposed on both sides of the battery outer case 6. The width of the hole 4a of the insulating film 4 may be slightly larger than the through hole 6a of the battery outer container 6. The insulating film 4 is a film made of polyparaphenylene terephthalamide (PPTA aramid) or polyimide and has excellent heat resistance, chemical resistance, and insulating properties, and even if it is as thin as several to several tens of μm, it is high. It has excellent mechanical properties in terms of strength. Further, a thin metal plate may be attached in advance in order to further improve the strength of the insulating film 4. In this case, the insulating material is arranged on the battery outer container 6 side.

The synthetic resin cylindrical body 5 has an outer diameter of the cylindrical body 2b which is substantially the same as the width diameter of the through hole 6a of the battery outer case 6, and the length thereof is equal to that of the battery outer case 6 and two insulating films 4. The thickness is approximately the same as or slightly larger than the thickness. Then, the synthetic resin cylindrical body 5 is inserted and arranged in the through hole 6 a of the battery outer container 6.
As the material of the synthetic resin cylinder 5, synthetic resin such as polytetrafluoroethylene, fluorinated polyethylene, polyethylene, polypropylene, polyamide, silicone resin, or the like, or an elastomer is suitable. Select appropriately considering the properties, sealing properties, mechanical properties, etc. Of course, these may be polymer alloyed or modified before use.

Then, the cylindrical body 2b of the first electrode pin 2 is inserted through the synthetic resin cylindrical body 5 and the insulating film 4, and the second electrode pin is inserted into the hole 2a of the cylindrical body 2b of the first electrode pin 2. The columnar body 3b of No. 3 is inserted, and in this state, the first electrode pin 2
When the plate body 2c of the second electrode pin 3 and the plate body 3c of the second electrode pin 3 are pressed, the tip of the cylindrical body 2b of the first electrode pin 2 comes into the concave groove 3d of the second electrode pin 3 as shown in FIG. The cylindrical body 2b of the first electrode pin 2 and the cylindrical body 3 of the second electrode pin 3 inserted therein while being guided and positioned at the base end portion of the cylindrical body 3b.
b is bulged and deformed in the horizontal direction while being compressed in the vertical direction, and the first electrode pin 2 and the second electrode pin 3 are inseparably integrated, whereby the sealed electrode terminal structure 1 of the present invention is The first electrode pin 2 and the second electrode pin 3 hermetically seal the through hole 6a while being surely insulated from the battery outer container 6. The second electrode pin 3 is originally the first electrode pin 2
Although the material is stiffer and harder to be deformed, it can be deformed similarly to the first electrode pin 2 due to the presence of the hollow portion 3a. As this pressing means, impact,
There are a press and a cold rocking press, and ultrasonic welding or resistance welding may be used in combination with these.

In the sealed electrode terminal structure 1 of the present invention thus constructed, a positive electrode aluminum lead tab is connected to the first electrode pin 2 inside the battery by ultrasonic welding or the like, and at the outside of the battery. A nickel lead tab is connected to the second electrode pin 3 by a spot resistance welding method, a laser spot welding method or the like to assemble a lithium battery or a lithium ion secondary battery.

In the above-described first embodiment, the first electrode pin 2 is arranged inside the battery and the second electrode pin 3 is arranged outside the battery. The first electrode pin and the second electrode pin may be interchanged in shape as long as the materials of the electrode pin and the second electrode pin are left as they are.

FIGS. 3 and 4 show a second embodiment of the sealed electrode terminal structure of the present invention. In this sealed electrode terminal structure 1, the first electrode pin 2 is located outside the battery. Arranged, second
The electrode pin 3 is disposed inside the battery. Then, when the battery is a non-aqueous electrolyte lithium battery or a lithium ion secondary battery and the sealed electrode terminal of the present invention is a positive electrode,
The material of the first electrode pin 2 arranged on the outside of the battery is most preferably nickel, nickel-plated copper, or nickel-plated steel plate in terms of workability and welding with a nickel lead tab,
Aluminum, aluminum alloy, titanium, special stainless steel containing molybdenum, etc. are suitable as the material of the second electrode pin 3 arranged inside the battery. Especially, aluminum and aluminum alloy have electrical characteristics and workability. It is the best because it is excellent and inexpensive. Then, the material of the battery outer container 6 serving as the negative electrode is stainless steel,
Nickel plated steel plate, etc.

On the other hand, when the sealed electrode terminal of the present invention is used as a negative electrode, nickel, nickel-plated copper, or nickel-plated steel plate is processed as the material of the first electrode pin 2 arranged outside the battery. Of the second electrode pin 3 disposed inside the battery is preferably copper, nickel, nickel-plated copper, or nickel-plated steel plate. Copper, which is particularly excellent in electrical characteristics, workability, and weldability, is suitable. And
As the material of the battery outer container 6 which becomes the positive electrode, special stainless steel containing aluminum, aluminum alloy, titanium, and molybdenum is preferable, and particularly, electrical characteristics,
Aluminum is the most suitable in terms of workability and economy.

Since the second electrode pin 3 is softer than the first electrode pin 2 in terms of material, the columnar body 3b is used.
Even when the hollow portion 3a as in the first embodiment described above is not formed, the first electrode pin 2 and the second electrode are compressed by being pressed and compressed in the vertical direction and are bulged in the horizontal direction. The pins 3 are inseparably integrated with each other, whereby the sealed electrode terminal structure 1 of the present invention has the through-holes 6 a while the first electrode pins 2 and the second electrode pins 3 are reliably insulated from the battery outer container 6. Is hermetically sealed.

FIGS. 5 and 6 show a third embodiment of the sealed electrode terminal structure of the present invention, in which the first electrode pin 2 is inside the battery and the second electrode pin 3 is outside the battery. The point of being arranged in and the materials thereof are the same as those in the second embodiment described above. In the first electrode pin 2, the depth of the hole 2a of the cylindrical body 2b is set to be shallower than the depth of the hole 2a in the above-described first and second embodiments, and
The width of the bottom of the hole 2a is enlarged. As a result, when the columnar body 3b of the second electrode pin 3 is inserted into the hole 2a of the first electrode pin 2 and biased by pressing, the tip portion of the columnar body 3b of the second electrode pin 3 is enlarged. The first electrode pin 2 and the second electrode pin 3 are inseparably integrated by being compressed and deformed so as to follow the hole 2a of the first electrode pin 2, and the first electrode pin 2 and the second electrode pin 2 are integrated. The electrode pin 3 is insulated from the battery outer container 6 and hermetically seals the through hole 6a.

FIGS. 7 and 8 show a fourth embodiment of the sealed electrode terminal structure of the present invention, in which the first electrode pin 2 is inside the battery and the second electrode pin 3 is outside the battery. The points and the materials thereof are the same as those in the second and third embodiments described above. A screw thread is formed in the hole 2a of the cylindrical body 2b of the first electrode pin 2, and the second electrode pin 3 is formed.
The columnar body 3b is also formed with a thread to be screwed with this.
The columnar body 3b of the second electrode pin 3 is screwed into the hole 2a of the first electrode pin 2 with an adhesive to insert the first electrode pin 2 and the second electrode pin 3 into each other. Are inseparably integrated, and the plate body 2c of the first electrode pin 2 and the plate body 3c of the second electrode pin 3 are the insulating film 4 and the synthetic resin cylindrical body 5.
By closely contacting with each other in a compressed state, the first electrode pin 2 and the second electrode pin 3 are insulated from the battery outer container 6 and hermetically seal the through hole 6a.

In each of the above-mentioned embodiments, the insulating film 4 and the synthetic resin cylinder 5 are arranged separately from the first electrode pin 2 and the second electrode pin 3. Of course, the present invention is not limited to this. For example, the first electrode pin 2 and the second electrode pin 3 may be preliminarily formed with an insulator, or the insulating film 4 and the synthetic resin cylinder 5 may be integrated. This may be used by being engaged with each electrode pin, and even in this case, the same action and effect as described above are exhibited.

[0029]

As described in detail above, according to the sealed electrode terminal structure of the present invention, it is possible to reliably insulate the battery outer container from the conventional fused glass in which the material of the electrode terminal is limited. In addition, the hole of the battery outer container can be easily sealed with excellent airtightness. Since the sealing electrode terminal has the two-piece structure of the first electrode pin and the second electrode pin, the material having the optimum electric characteristics inside the battery and the material having the optimum weldability outside the battery are provided. Can be selected in an appropriate combination.

Therefore, in non-aqueous electrolyte batteries such as lithium batteries and lithium-ion secondary batteries, the fused glass is conventionally used when high sealing performance is required. However, the use of materials such as titanium and special stainless steel, which are not optimal in terms of weldability and economic efficiency, has been unavoidable. Aluminum or aluminum alloy, which has excellent mechanical properties and excellent workability, and nickel, which has excellent weldability with the nickel lead tab, can be used on the outside of the battery, and is suitable for the inside of the battery if it is a negative terminal. It is possible to use copper, which has excellent electrical characteristics, and nickel, which has excellent weldability with the nickel lead tab, on the outside of the battery.

[Brief description of drawings]

FIG. 1 is an exploded view of a first embodiment of a sealed electrode terminal structure of the present invention.

FIG. 2 is a sectional view of a first embodiment of the sealed electrode terminal structure of the present invention in an assembled state.

FIG. 3 is an exploded view of a second embodiment of the sealed electrode terminal structure of the present invention.

FIG. 4 is a sectional view of a second embodiment of the sealed electrode terminal structure of the present invention in an assembled state.

FIG. 5 is an exploded view of a third embodiment of the sealed electrode terminal structure of the present invention.

FIG. 6 is a sectional view of a third embodiment of the sealed electrode terminal structure of the present invention in an assembled state.

FIG. 7 is an exploded view of a fourth embodiment of the sealed electrode terminal structure of the present invention.

FIG. 8 is a sectional view of a fourth embodiment of the sealed electrode terminal structure of the present invention in an assembled state.

[Explanation of symbols]

 1 Sealed Electrode Terminal Structure 2 First Electrode Pin 2a Hole 2b Cylindrical Body 3 Second Electrode Pin 3a Hollow 3b Columnar Body 4 Insulating Film 4a Hole 5 Synthetic Resin Cylindrical Body 6 Battery Exterior Container 6a Through Hole

Claims (5)

[Claims] 1. A first electrode pin formed by projecting a cylindrical body that can be housed in a hole formed in a battery outer container from a plate body, and a diameter that can be housed in the cylindrical body of the first electrode pin. A second electrode pin formed by projecting a columnar body made of a plate body from the plate body, and the columnar body of the second electrode pin is fitted in the cylinder of the first electrode pin that is inserted through the hole of the battery outer container. A sealed electrode terminal structure, characterized in that the first electrode pin and the second electrode pin press-contact and sandwich the battery outer container to hermetically seal the hole of the battery outer container. 2. A synthetic resin cylindrical body housed in a hole formed in a battery outer container, and a hole provided in both sides of the battery outer container corresponding to the hole of the battery outer container. An insulating film having a perforated portion, a first electrode pin formed by projecting a cylindrical body that can be stored in the synthetic resin cylindrical body from a plate body, and can be stored in the cylindrical body of the first electrode pin A cylindrical body of the first electrode pin, which comprises a second electrode pin formed by projecting a columnar body having a different diameter from a plate body, and which is inserted through the hole of the synthetic resin cylinder and the hole of the insulating film. The columnar body of the second electrode pin is inserted into the above, and the insulating film, the synthetic resin cylinder and the battery outer casing are pressed and sandwiched by the first electrode pin and the second electrode pin to form a hole portion of the battery outer casing. A sealed electrode terminal structure, which is hermetically sealed. 3. The sealed electrode terminal structure according to claim 1, wherein a hollow portion is formed in the columnar body of the second electrode pin. 4. The first electrode pin and the second electrode pin are pressed against both sides of the plate body to deform the cylindrical body of the first electrode pin and the columnar body of the second electrode pin so that they are engaged with each other. The sealed electrode terminal structure according to claim 1, wherein: 5. The sealed electrode terminal structure according to claim 1, wherein the cylindrical body of the first electrode pin and the columnar body of the second electrode pin are screwed to engage with each other.