JPS6016034Y2 - thin battery - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a thin battery with an improved structure for mounting on equipment.

A conventional thin battery has a structure in which cathode and cathode terminals are separately disposed as shown in FIG. 1, and is inserted and held in a battery housing of a device in which it is used.

In Fig. 1, 1 is a thin battery, 2 is a battery storage part, 3, 4
are a pair of screws and spring terminals that contact the terminal portion and hold the thin battery 1 between them.

However, with such a structure in which the battery is clamped elastically from both sides, when inserted into the battery storage section 2, a part of the exterior body is strongly pressed and rubbed by the screws 3 and the spring terminals 4.

Therefore, if the exterior body is torn and the metal foil is exposed, it may contact the inner surface of the battery compartment and cause a short circuit, or the anode body, cathode body, and bipolar current collector may separate, increasing the internal resistance of the battery and discharging it. Sexual performance deteriorates.

In addition, there is a risk that the pressing force applied to the separator in the center may create rough areas in the electrolyte, increasing internal resistance, or that the pressed electrolyte may leak out from weak sealing areas at the peripheral edges due to internal pressure. was there.

On the other hand, the structure of the battery storage section 2 requires two surfaces to attach the screws 3 and the spring terminals 4, and is also thin and box-shaped in order to hold the thin battery with an insertion layer. Forced.

The necessity of having a specific structure for the battery storage section is a major constraint that becomes an obstacle in the design of small-sized devices that use thin batteries as a power source.

This idea was made to deal with the above situation, and the negative and anode terminals are both facing the same side on one side of the exterior body, and the attachment part for fixing it to the target part is attached to that side. To provide a thin battery that is easy to install, does not cause problems caused by pinching the battery, and eliminates structural limitations of the battery storage part to make effective use of the internal space of the device in which it is used. It is something.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 2a and 2b, 11 is a separator made of a nonwoven fabric of acetalized polyvinyl alcohol fibers, and this separator 11 contains an electrolytic solution consisting of, for example, a mixed aqueous solution of zinc chloride and ammonium chloride.

Further, a heat-fusible resin layer 12 is formed around the periphery of the separator 11 by coating or impregnating a heat-fusible resin mainly composed of polyamide resin, for example.

Next, 13 is a cathode current collector, and 14 is an anode current collector. These current collectors are made of corrosion-resistant metal foil such as aluminum 11, nickel, steel, stainless steel, etc., and the inner surface is coated with carbonaceous epoxy. Carbon films 15 and 16 are deposited by adding a binder such as a resin and applying, spraying, or the like.

On the inside of the carbon film 15 on the side of the cathode current collector 13, a thin layer of cathode body made of a cathode active material such as zinc foil or zinc powder is formed in close contact.

Furthermore, the inside of the carbon film 16 on the anode current collector 14 side is made mainly of manganese dioxide powder as an active material, to which acetylene black as a conductive material and polyvinyl alcohol or polyacrylic acid as a binder are added. The mixed anode body 18 is closely attached and shaped by, for example, screen printing or roller coating.

Therefore, the separator 11 described above is connected to these cathode bodies 1.
7 and the anode body 18.

A stack of battery power generation elements such as a cathode current collector 13, a cathode body 17, a separator 11, an anode body 1δ, and an anode current collector 14 is made into a film-like structure made of synthetic resin, except for the cathode terminal part 19 and the anode terminal part. The battery is completed by enclosing it in the exterior body 21, heating the periphery, thermo-compressing the power generation element with the heat-fusible resin of the separator 11, and sealingly fixing it.

At this time, the anode terminal part 20 extends one end of the anode current collector 14 [7] by folding it back to form an extension part by not following the surface side through the insulating layer 22, and part of this extension part is attached to the insulating layer 22. 22
and is formed so as to be exposed in a circular shape from the exterior body 21.

Further, the cathode terminal portion 19 has a shape in which the cathode current collector 13 is exposed in a circular shape from the insulating layer 22 and the exterior body 21, and the cathode and anode terminal portions 19 and 20 are both exposed to the same surface on one side of the exterior body 21. Arrange.

Furthermore, a cathode terminal plate 23 and an anode terminal plate 24 made of a magnetic material are fixed to the cathode terminal portion 19 and anode terminal portion 20, respectively, as attachments for attachment to the equipment in use.

As the cathode terminal plate 23 and the anode terminal plate 24, a magnetic material having relatively high electrical conductivity, such as a nickel plate or a steel plate plated with nickel, is used.

This thin battery has the above-mentioned configuration, and includes a cathode terminal plate 23 made of a magnetic material on the same side of one side of the package 21 of the battery.
Since the anode terminal plate 24 is formed, as shown in FIG. 3, contact terminals 25 and 26 each made of a magnet are provided in the battery mounting part of the target device in opposition to these terminal plates 23 and 24. By keeping it in place, it can be easily attached using magnetic attraction.

Since thin batteries are thin and lightweight, they can be held securely by such means.

Note that the circle 30 in the figure indicates a thin battery.

By adopting this structure, there is no need to apply excessive pressing force unlike when holding conventional thin batteries, so there is no risk of short circuits caused by damage to the exterior body and exposure of the metal foil, as well as to the anode and cathode bodies. It is possible to almost eliminate the fear of deterioration of discharge performance due to peeling of the current collector or density of the electrolytic solution, and leakage of the electrolytic solution.

In addition, this thin battery has the structure required for installation only on one side and is attached, so there is no need to sandwich it.
Constraints on the structure of the battery storage section can be removed and this can be significantly simplified.

Moreover, since there is no need to provide anything on the other side, the overall width of the occupied space can be reduced, and the internal space of the equipment used can be effectively utilized.

Further, depending on the case, the cover of the battery mounting part may be omitted.

Since equipment using thin batteries as a power source is originally intended to be small and lightweight, the above-mentioned simplification of the configuration contributes to further improvement of such characteristics.

Next, the mounting structure shown in Figure 4 uses a magnet for the terminal plate 23.24 on the battery side, and a magnetic material that is attracted to the contact terminal 25.26 on the equipment side, contrary to the case shown in Figure 3. ing.

Further, in FIG. 5, the terminal portion is not used for attachment, but a velvet type fastener 27 is provided in the other portions to enable attachment.

In the embodiment shown in FIG. 6, one side of the double-sided adhesive tape 28 is adhered to the thin battery, thereby making it possible to attach it to the battery mounting portion.

Note that this invention is not limited to the above embodiments, and can be implemented with various modifications without changing the gist.

Although Figures 3 to 6 are shown as structures for attaching batteries,
This invention is not limited to these, and can employ various configurations that work equally well.

As described above, according to this invention, both the negative and anode terminals are formed so as to face the same surface on one side of the exterior body, and the attachment body for fixing to the target part is formed on that surface. ``It is possible to provide a thin battery that is easy to install, does not cause problems caused by squeezing the battery, and can eliminate constraints on the structure of the battery storage section and effectively utilize the internal space of the device in which it is used.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a configuration in which a conventional thin battery is installed in a battery storage part, and Figs. 2 a and b show an embodiment of this invention, in which a is a plan view and b is a view B. A vertical cross-sectional view of the B' line portion, FIG. 3 is an explanatory diagram of the configuration in which the same embodiment is attached to the battery storage part, and FIGS. 4 to 6 are other examples of the configuration in which the battery is attached, respectively, used in this invention. FIG. 1...Thin battery, 2...Battery storage section,
2...Bent screw, 4...Spring terminal, 11...
... Separator, 12 ... Heat-fusible resin layer, 1
3... Cathode current collector, 14... Anode current collector, 15, 16... Carbon film, 17...
Cathode body, 18... Anode body, 19... Cathode terminal part, 20... Anode terminal part, 21...
... Exterior body, 22 ... Insulating layer, 23 ...
・Cathode terminal plate, 24...Anode terminal plate, 25.2
6...Contact terminal, 27...Velvet fastener, 28...Double-sided adhesive tape, 30...
...Thin battery.

Claims (5)

[Scope of utility model registration request] (1) A separator whose periphery is impregnated or coated with a heat-fusible resin and an electrolyte is contained inside, and a separator with a cathode body and an anode body disposed on both sides of the separator as the center. A cathode current collector and an anode current collector whose peripheral portions are adhered to the heat-fusible resin layer, a synthetic resin exterior covering the surfaces of these current collectors, and the cathode current collector. A cathode terminal portion is formed by exposing a portion of the anode current collector from the exterior body, and an extension portion is formed by extending one end of the anode current collector and folding it back along the upper surface of the cathode current collector through an insulating layer. and an anode terminal part formed by exposing a part of the extension part from the exterior body, and the cathode terminal part and the anode terminal part are provided facing the same surface on one side of the exterior body. A thin battery characterized by having an adhesive on its surface for attachment to a battery mounting part of a device in which it is used. (2) The thin battery according to claim 1, which has been registered as a utility model, characterized in that the attachments include an inlet terminal plate and an anode terminal plate made of a magnetic material. (3) The thin battery according to claim 1, wherein a cathode terminal plate and an anode terminal plate constituted by magnets are used as the attachments. (4) The thin battery according to claim 1, which is a registered utility model, characterized in that a velvet-type fastener provided on one side of the exterior body is used as the attachment body. (5) The thin battery according to claim 1, which is a registered utility model, characterized in that the adhesive is a double-sided adhesive tape adhered to one surface of the exterior body.