JPS58225561A - Thin-type cell - Google Patents

Abstract

PURPOSE:To allow multiple cells to be easily gathered, dispersed, managed, and conveyed even in the distribution process of unused cells by constituting a concave lead terminal with an elastic member and further using an elastic member for a convex lead terminal. CONSTITUTION:A ring 27 constituted with an elastic material such as aluminum, copper, stainless steel, nickel chrome steel is coupled to the protruded section of a negative electrode lead terminal 16a to suppress the concave secton of the negative electrode lead terminal 16a and to shrink the space in the concave section, thus a cell is assembled. By providing the ring 27, a suppression holding force due to an elastic power is further applied between both electrode lead terminals when a positive electrode lead terminal 17a is inserted and coupled into a negative electrode lead terminal 16a, thereby an electrical connection which is secure against the vibration and shock can be maintained. In addition, by forming the ring 27 with a material having elasticity and flexibility concurrently, such as rubber, the joint section between lead terminals can be unforcibly bent following the storage shape even in case of a complicated cell storage section, thus enabling the free power supply design and allowing the series and parallel connection very easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lead terminal structure for a thin battery in which a power generating element is externally sealed with an insulating film.

Batteries have conventionally been known to have a structure in which a power generating element is sealed in a sturdy can or case made of metal or hard synthetic resin. Such batteries require an exterior sealing member that protects the power generation element from external impact and pressure, and is hard and thick enough to prevent deformation when the battery is installed in electronic equipment. When storing multiple batteries while ensuring sufficient battery storage space,
It was extremely difficult to design a free storage shape.

This is because the battery shape is determined, and the series-parallel electrical connection conditions and positional arrangement conditions overlap, resulting in a restricted space shape.

Therefore, in recent years, it has been proposed to use an insulating film made of a polymer material, etc., which is lightweight, has excellent bendability and other processability, and can withstand external shocks, instead of thick metal synthetic resin as an exterior sealing member for batteries. There is.

There are two types of batteries: one is one in which an insulating film is deformed and solidified into a desired shape, and then a power generating element is injected to assemble the battery, and the other is one in which a flexible insulating film is prepared in advance and the power generating element is assembled. Some have a sealed exterior. The former does not have the property of being freely bendable after the battery is completed, but the latter has the property of being freely bendable.

In addition, it has many advantages such as being thinner and lighter than ever before, has a flexible design, and is easy to mass produce, but it is also difficult to make electrical connections when storing it in calculators, games, lighters, and other electronic devices. Because it does not have a terminal structure,
For example, when storing multiple batteries, consider the storage arrangement between the batteries or between the batteries and the equipment in order to install the desired series-parallel connection, power supply voltage and capacity in the equipment.
It was extremely difficult to avoid compromising the design requirements of the equipment.

For example, as shown in FIG.
When storing the battery in a battery and making a series electrical connection, connect the cathode terminal 4 of one battery to the contact terminal 6, connect the anode terminal 5 and the cathode terminal 8 of the other battery with the conductor 7, and connect the anode terminal 4 to the contact terminal 6. 9 to the contact terminal 10. Further, in order to fix the battery, a battery retainer 11 formed by bending a spring plate is interposed between the inner wall of the battery storage chamber 12 and the battery, and then the battery storage chamber 12 is sealed with a lid 13. With this type of terminal structure, when making the desired electrical connection and arrangement of two or more thin batteries in a limited space, it is necessary to connect the electrode terminals with a conductor or to make a contact connection between the electrode terminal and the contact terminal. This method requires complicated and troublesome work, such as requiring a battery holder, and therefore does not have a wide range of practical applications.

In order to eliminate such conventional drawbacks and further expand the convenience of handling thin batteries in everyday life, the present invention has been made after repeated studies to extend a part of the cathode and anode current collectors and to remove the protruding parts of the lead terminals. At least one of the lead terminals is made concave and the other is convex, and the concave terminal is made of an elastic member so that the lead terminals are fitted and fixed with elastic force, and the convex terminal is also made of an elastic member. By using a flexible material and a flexible material for both terminals, the above-mentioned conventional drawbacks can be solved, and even in the distribution process of unused batteries, it is possible to easily aggregate, disperse, manage, and transport multiple batteries. I found it.

The present invention will be described in detail below based on examples, but the present invention is not limited to the following examples without exceeding the gist.

Embodiment 1 FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG. 3 is a plan view thereof.

A flexible metal cathode current collector 16 and anode current collector 17 are adhered to the polymer films 14 and 15. One end of the cathode current collector 16 protrudes as a cathode lead terminal 16a that has been previously formed into a concave shape having a flat plate-like space.
One end of the anode current collector 17 is a flat anode lead terminal 17.
It protrudes on the opposite side of the cathode lead terminal 16a. The cathode lead terminal 16a is made of an elastic material such as aluminum, copper, stainless steel, nickel-chromium copper phosphor bronze, etc., so that the cathode lead terminal 16a and the anode lead terminal 17a can be inserted and removed at will. The terminal 17a is crimped with elastic force, and the vertical distance in the flat plate space is made smaller than the plate thickness of the anode lead terminal 17a to the extent that a reliable electrical connection can be maintained.

The cathode active material 18 and the anode active material 19 are each connected to a current collector 16.
, attached to 17. Holding member 20 impregnated with electrolyte
and a separator 21 are stacked and installed between the cathode active material 18 and the anode active material 19, and a joint 22 between the polymer film 14 and the anode lead terminal 17a and a joint between the polymer film 15 and the cathode lead terminal 16a are formed. 23, and the peripheral portions 24 of the polymer films 14 and 15 are bonded together using an adhesive or hot pressure bonding to assemble the battery.

The materials constituting the current collector and lead terminals may be the same, or they may be made of different materials connected by welding, etc., and the materials should be selected in a timely manner depending on the flexibility and elasticity required for mounting. However, by combining them, it becomes possible to implement various shapes and connect batteries.

FIG. 4 shows a state in which the batteries are housed in series connection in a battery housing portion having a curved portion and a right-angled corner portion.

In the curved portion 12a, since the battery itself is flexible, it is possible to store the battery 25 along the curved shape, and both the cathode lead terminal and the anode lead terminal are made of elastic and flexible materials. Therefore, even when connecting the batteries at the right-angled corner portion 12b, the joint portion 26 bends accordingly, and a reliable electrical connection can be maintained.

Embodiment 2 FIG. 5 is a sectional view showing another embodiment of the present invention.
The figure is a perspective view thereof.

A ring 27 made of an elastic material such as aluminum, copper, stainless steel, nickel chromium copper, or phosphor bronze is fitted onto the protruding portion of the cathode lead terminal 16a, and the concave portion of the cathode lead terminal 16a is pressed to fill the concave inner space. A battery is assembled in the same manner as in Example 1 except for reducing the size.

By providing the ring 27, when the anode lead terminal 17a is inserted and joined to the cathode lead terminal 16a, a concave pressure holding force due to elasticity is further applied between the two electrode lead terminals.
It becomes possible to maintain reliable electrical connection even against vibrations and shocks. Furthermore, by forming the ring 27 from a material such as rubber that has both elasticity and flexibility, the joints between the lead terminals can easily bend to follow the shape of the battery even in a complex battery compartment. This allows for flexible power supply design.

Note that the cathode lead terminal may have a convex shape and the anode lead terminal may have a concave shape so that they can be joined, or the cathode lead terminal and the anode lead terminal may be provided anywhere on the outer periphery of the battery.

The battery configuration described above not only allows flexibility in the design of battery storage in electronic devices, etc., but also allows series and parallel connections to be made extremely easily, making it possible to provide the desired power supply function to the device. Batteries are easy to store and replace. In addition, in the distribution process of the batteries of the present invention, many batteries can be assembled into one unit, making transportation easy, and separating and dispersing is easy, which facilitates quantity control.
The present invention has great practical value in industry.

[Brief Description of the Drawings] Fig. 1 is a cross-sectional view showing an example of a structure for storing a thin battery in a device according to a conventional example, Fig. 2 is a cross-sectional view of a battery showing an embodiment of the present invention, and Fig. 3 is a cross-sectional view of the battery according to an embodiment of the present invention. A plan view of FIG. 4 is a cross-sectional view showing the batteries connected in series and stored in a battery compartment of a device, FIG. 5 is a partial cross-sectional view of a battery showing another embodiment of the present invention, and FIG. It is the whole perspective view. 1, 2... Power generation element, 3... Insulating film 4, 8...
Cathode terminal, 5, 9...Anode terminal, 6, 10...Contact terminal, 7...Conductor wire, 11...Battery holder 12...Battery storage chamber,
13... Lid, 14, 15... Polymer film 16... Cathode current collector, 17... Anode current collector, 16a... Cathode lead terminal, 17a... Anode lead terminal 18... Cathode active material,
19...Anode active material, 20...Holding member, 21...Separator, 22, 23...Joint part, 24...Peripheral part, 25
...Battery, 26...Joint, 27...Ring patent applicant Tomoyuki Aoki

Claims (1)

[Scope of Claims] 1. In a thin battery in which a power generation element is sealed with an insulating film, a portion of a cathode current collector and an anode current collector is extended to form a protruding portion of a lead terminal, and the protrusion of the lead terminal is A thin battery characterized in that one of the lead terminals has a concave shape and the other has a convex shape, and at least the concave lead terminal is made of an elastic member. 2. The thin battery according to claim 1, wherein the two lead terminals are made of elastic and flexible members. 3. In a thin battery in which the power generation element is externally sealed with an insulating film, a part of the cathode current collector and the anode current collector is extended to form a protruding part of the lead terminal, and one of the lead terminals has a concave shape and the other has a concave shape. 1. A thin battery, characterized in that the lead terminal has a convex shape, and an elastic ring is installed on the protrusion of the concave lead terminal. 4. The thin battery according to claim 3, wherein the two lead terminals are made of elastic and flexible members. 5. The thin battery according to claim 3, wherein the elastic ring has flexibility.