JP2000311673A - Thin battery and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a battery and make it lightweight by providing opening sections for exposing electrode terminals on an insulating film, fixing a circuit element on the insulating film, and connecting one terminal of the circuit element to the electrode terminal in each opening section. SOLUTION: A battery body section M is molded into a nearly rectangular thin plate shape, a plate-like battery 10 is sealed by an insulating film 4, and electrode terminals 30, 31 are extracted on the same plane as the battery body section M from one side of it. The electrode terminals 30, 31 are pinched by the insulating film 4 to form an electrode extraction section H. One opening section 6 is provided for each of the positive electrode terminal 30 and the negative electrode terminal 31 serving as electrode terminals, and the electrode terminals 30, 31 in the opening sections 6 are exposed through the opening sections 6 form the external terminals of the thin battery 10. The opening sections 6 are provided at part of the pinch portions of the electrode terminals 30, 31 on the electrode extraction section H of the insulating film 4. The opening sections 6 are provided on one face only of the sheet-like electrode extraction section H and are formed at positions not including the tip section 4E of the insulating film 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin battery and an electronic apparatus for supplying power from the thin battery.

[0002]

2. Description of the Related Art In recent years, electronic devices, particularly portable devices such as portable telephones and notebook personal computers, have been rapidly reduced in size and weight. With the miniaturization and weight reduction of such electronic devices, thin batteries are regarded as promising as batteries built in these devices.

FIG. 26 is a perspective view showing the appearance of such a conventional thin battery. The thin battery 19 is a thin plate battery including a battery main body (internal battery) M covered with an insulating film and electrode terminals 30 and 31. One end of each of the electrode terminals 30 and 31 is connected to a protruding portion of each of the current collectors 20 and 21 constituting the battery body M. The other ends (tips) of the electrode terminals 30 and 31 are connected to the ends of the insulating film 4. And become external terminals (battery input / output terminals) 32 and 33 of the thin battery 19.

In general, the current collectors 20 and 21 of the plate-shaped battery are formed to have a thickness of 0.04 mm or less, so that the mechanical strength is extremely low, and the protrusions of the current collectors 20 and 21 are used as external terminals as they are. Can not be used. Therefore, electrode terminals 30 and 31 having higher mechanical strength are connected, and some of the electrode terminals 30 and 31 are used as external terminals 32 and 33. The external terminals 32 and 33 are soldered to a power terminal (not shown) connected to a power circuit of the electronic device.

[0005]

[Problems to be solved by the invention]

However, if the thickness of the external terminal having a width of several mm is set to about 0.5 mm or less, the mechanical strength against external force becomes insufficient. For this reason, in the conventional thin battery, there was a problem that the external terminal was easily bent or dropped.

If the electrode terminal is formed thicker, the mechanical strength can be increased, but the weight is undesirably increased. For this reason, the mechanical strength of the external terminals cannot be sufficiently ensured, and there is a problem that it is not easy to store the thin battery and attach it to an electronic device.

The above problem is remarkable especially when the electrode terminals are made of copper. For this reason, it is conceivable to use a metal having higher mechanical strength than copper, for example, aluminum, nickel, or the like for the electrode terminal. However, since these metals are not suitable for soldering, external terminals made of these metals are
It must be connected to the power supply terminal by another method.

As another connection method, it is conceivable to connect an external terminal and a power supply terminal of the thin battery with a connector. However, for example, when inserting the external terminal into the female connector as a power supply terminal, a large external force is applied to the external terminal.
Since the mechanical strength is still insufficient for such external force, there has been a problem that the mounting work to the electronic device is not easy.

Further, as another method, it is conceivable to connect the external terminal of the thin battery and the power supply terminal by spot welding, but there is a problem that the resistance value of the connection portion becomes high.

The present invention has been made in view of the above circumstances, and has as its object to improve the mechanical strength of external terminals of a thin battery while reducing the weight of the thin battery. Another object of the present invention is to facilitate the work of connecting to a power supply circuit by crimping (for example, connector connection) an external terminal and a power supply terminal of the thin battery while reducing the weight of the thin battery. Also,
It is an object of the present invention to increase the mechanical strength of the external terminal so that the external terminal is electrically connected and the thin battery is fixed to the electronic device at the same time.

In addition, by making the external terminals thinner and lighter,
It is another object of the present invention to provide a small and lightweight thin battery, and to provide a small and light electronic device such as a mobile phone by incorporating the thin battery.

[0013]

According to the present invention, there is provided a thin battery according to the present invention, comprising: a plate-shaped battery main body; and a lead portion formed by sandwiching an electrode terminal connected to the plate-shaped battery main body with an insulating film. An opening for exposing the electrode terminal is provided in a holding portion of the insulating film, a circuit element is fixed on the insulating film, and one terminal of the circuit element is connected to the electrode terminal in the opening.

Further, in the thin battery according to the present invention, the circuit element is a temperature-sensitive protection element. In the thin battery according to the present invention, the plate-shaped battery is a plate-shaped lithium-ion battery, and the circuit element is fixed to the drawer.

Further, in the thin battery according to the present invention, the insulating film is made of a metal foil having a first insulating film formed on an inner surface and a second insulating film formed on an outer surface.
An opening for exposing the metal foil is provided in the insulating film, and one terminal of the circuit element is connected to the metal foil in the opening.

Further, in the thin battery according to the present invention, the plate-shaped battery body is substantially rectangular, and the circuit element is placed in a space formed by disposing two electrode terminals on one side of the plate-shaped battery body. Fix it.

Further, in the thin battery according to the present invention, the insulating film is made of a metal foil having a first insulating film formed on an inner surface, and a first opening is provided in the metal foil, and the first insulating film is formed. A second opening is provided in the film, and the second opening is formed in the first opening.

Further, in the thin battery according to the present invention, the insulating film is made of a metal foil having a second insulating film formed on an outer surface, the first opening is provided in the metal foil, and the second insulating film is formed. A third opening is provided in the film, and the third opening is formed in the first opening.

According to another aspect of the invention, there is provided an electronic apparatus comprising: a power supply circuit having a power supply terminal; and the thin battery according to claim 1, wherein the power supply terminal is crimped to an electrode terminal in the opening to form the thin battery. To the power supply circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a perspective view showing the appearance of an example of a thin battery according to the present invention. The thin battery 10 is a secondary battery such as a nickel-cadmium battery, a nickel-metal hydride battery, and a lithium ion battery.
And an electrode lead-out portion H from which the electrode terminals 30 and 31 are drawn. In addition, the entire battery is covered with the insulating film 4, and the insulating film 4 of the electrode lead-out portion H has two openings 6.
Is provided.

The battery main body M is a plate-shaped battery formed into a substantially rectangular thin plate shape and sealed with an insulating film 4. One side of the battery main body M is flush with the battery main body M (that is, parallel to the rectangular surface). 2) The electrode terminals 30, 31 are drawn out. The electrode lead-out portion H is configured by sandwiching the electrode terminals 30 and 31 with the insulating film 4.

The opening 6 is provided with a positive electrode terminal 3 as an electrode terminal.
One electrode terminal is provided for each of the negative electrode terminal 31 and the negative electrode terminal 31, and the electrode terminals 30 and 31 in the opening 6 exposed through the opening 6 constitute external terminals of the thin battery 10. This opening 6 is an electrode lead-out portion H of the insulating film 4,
The electrode terminals 30 and 31 are provided on a part of the sandwiched portion. Further, it is provided only on one surface of the sheet-like electrode lead-out portion H, and is formed at a position not including the end 4E of the insulating film (the tip side of the electrode terminals 30, 31).

FIG. 2 is a sectional view of the thin battery shown in FIG.
FIG. 3 is a cross-sectional view taken along a cut surface, illustrating a structure of a battery body M. The battery body M is formed by sealing the laminated structure together with the electrolytic solution with the insulating film 4.

The laminated structure includes a positive electrode 22 formed on a positive electrode current collector 20 and a negative electrode 23 formed on a negative electrode current collector 21.
Are laminated via the isolating material 24, and each layer has a planar shape. Therefore, the thickness of the laminated structure is about 0.1 mm to 1 m.
m. Note that the number of layers of the positive electrode 22 and the negative electrode 23 is not limited to one layer, and the capacity can be increased by laminating a plurality of layers. In addition, a polymer,
A resin is used, and such a battery is called a polymer battery.

This laminated structure is sandwiched from above and below by the insulating film 4, and the peripheral portions of the insulating film 4 are adhered and sealed to each other to form the battery main body M. Since the battery main body M repeatedly expands and contracts due to charge and discharge operations, the flexible insulating film 4 also serves as a battery housing.

FIG. 3A is a sectional view taken along the line BB ′ shown in FIG. 1, and FIG. 3B is an enlarged view of a part of FIG. It is shown.
The sectional view on the electrode terminal 31 is exactly the same as this figure.

The insulating film 4 seals the laminated structures 20 to 24 and sandwiches the electrode terminals 30 from above and below via the adhesive 5. The electrode terminal 30 is connected to the battery body M
The electrode terminals 30 in the openings 6 are connected to the protruding portions 20 of the current collectors drawn out from the laminated structures 20 to 24 of FIG. The thickness of the electrode terminal 30 is 0.5 mm or less, and is 0.02 mm or more, which is the thickness of a general current collector 20.

The insulating film 4 is a flexible sheet in which the surface of a metal foil 40 made of aluminum or the like is covered with insulating films 41 and 42. The metal foil 40 is formed extremely thin for weight reduction and has insufficient mechanical strength. Therefore, by covering the surface with an insulating material such as a resin, the mechanical strength is increased and the insulating property is ensured. For example, a polyethylene thin film is formed on the inner insulating film 41, and an outer insulating film 42 is formed on the inner insulating film 41.
The insulating film 4 can be formed by using a polypropylene thin film and bonding these to the metal foil 40.

The adhesive 5 is made of an insulating adhesive material such as a resin. The electrode terminals 30 and 31 are sandwiched between the insulating films 4 by bonding the opposing surfaces of the upper and lower insulating films 4 with the adhesive 5. In addition, the adhesive 5 is applied to the electrode terminals 3.
It is also possible to have the function of bonding and fixing 0 and 31 to the insulating film 4.

The opening 6 is provided at a position not including the tip 4E of the electrode lead-out portion H. Therefore, the electrode terminal 3
In the length direction (left-right direction in FIG. 3), the electrode terminals 30
Are sandwiched by the insulating film 4 at both ends (the tip side and the battery body side) of the opening 6.

For this reason, the electrode terminals 30 in the opening 6 are spread on the insulating film 4 and cannot move independently. That is, the external electrode 32 is locked by the insulating film 4 at both ends in the electrode terminal length direction, and the mechanical strength of the external electrode 32 is increased.

FIG. 4 is a sectional view taken along the line CC ′ shown in FIG. The positive electrode terminal 30 and the negative electrode terminal 31 are sandwiched by the insulating film 4 at a predetermined interval, and the electrode terminals 30 and 31 in the opening 6 are external electrodes 32 and 33, respectively.

The opening 6 has a width smaller than the width of the electrode terminals 30 and 31. Therefore, the electrode terminals 30, 31
Also in the width direction of FIG.
Numerals 0 and 31 are sandwiched by the insulating film 4 at both ends of the opening 6, and the mechanical strength of the external electrodes 32 and 33 is further increased.

The external terminals 32 and 33 are in contact with the lower insulating film 4 (the side opposite to the opening 6) so that the entire lower surface thereof is along. Therefore, a part of the external force applied to the external terminals 32 and 33 is received by the insulating film 4, so that the mechanical strength of the external terminals 32 and 33 can be improved.

When the adhesive 5 adheres and fixes the electrode terminals 30 and 31 to the insulating film 4, the external terminals 32 and 33 are engaged with the insulating film 4 to be integrated. That is, the external electrode 32 is locked to the insulating film 4 on the side opposite to the opening 6, and the external electrode 32,
33 is further enhanced in mechanical strength.

Further, by providing the external terminals 32 and 33 at a predetermined interval and engaging them with the insulating film 4, the external terminals 32 and 33 can be made wider than in the case where the external terminals are pulled out individually. Can be supported by surface. For this reason, the external terminals 32 and 33 are
This makes it difficult to receive an external force parallel to the plane, and can also receive a vertical external force dispersed in the plane, so that the mechanical strength is increased.

In this manner, by increasing the mechanical strength of the external electrodes 32 and 33, damage such as bending and dropping can be prevented, and the storage of the thin battery and the work of attaching it to the electronic equipment become easy. . Therefore, the manufacturing cost of the electronic device can be reduced, and the yield can be improved. Further, the electrical connection to a power supply circuit or the like is facilitated by the contact.

The electrode lead-out portion H of the insulating film 4 is
The connection portion 4J is connected to the battery main body portion M, and the width of the connection portion 4J is wider than the width of the external terminals 32 and 33. For this reason, the electrode lead-out part H can be firmly engaged with the battery main body part M, and bending or the like of the electrode lead-out part H due to external force can be suppressed. By locking the external electrodes 32 and 33 in such an electrode lead-out portion H, the work of connecting the external electrodes 32 and 33 to the power supply circuit can be facilitated when the thin battery is incorporated in the electronic device. it can.

In particular, the insulating film 4 forming the battery body M and the insulating film 4 forming the electrode lead-out portion H
When integrally formed using the same insulating film,
Engagement between the electrode lead-out portion H and the battery main body portion M is strengthened, so that bending and the like of the electrode lead-out portion H can be more effectively suppressed, and cost can be reduced by reducing the number of components.

The opening 6 is formed only on one side of the electrode extraction portion H.
Is provided, the surface on which the opening 6 is not provided can be attached to a flat portion such as a housing of an electronic device or a printed circuit board. In this case, electrical connection by contact is facilitated, and connection of the connection is facilitated. Electrode pull-out part H
Can be fixed to a housing or the like.

The thin battery 10 has an upper insulating film 4 provided with an opening 6 in advance by an opening process such as punching.
And the lower insulating film 4 without the opening 6,
It can be manufactured by sandwiching the electrode terminals 30 and 31. However, it is necessary to perform positioning so that the opening 6 is located above the electrode terminals 30 and 31. The metal foil 4
Although the openings 6 may be provided after the insulating films 41 and 42 are bonded to 0, the positioning may be performed after the openings 6 are provided in each.

After the electrode terminals 30 and 31 are sandwiched between the two insulating films 4 having no opening 6, the insulating film 4 corresponding to the opening 6 is etched or the like.
Also, it can be manufactured by removing the adhesive 5.

In this embodiment, the case where the electrode terminals 30 and 31 are sandwiched between the two insulating films 4 has been described.
The electrode terminals 30 and 31 may be sandwiched. FIG. 5 is a diagram showing the appearance of the thin battery 11 having such a configuration.
FIG. 6 is a cross-sectional view taken along the line DD ′ in FIG. 5.

Further, in this embodiment, the insulating film 4 is provided at all the ends of the opening 6 with the electrode terminals 30 and 31.
Is sandwiched. From the viewpoint of improving the mechanical strength of the external electrodes 32 and 33, such a configuration is desirable. However, at least two or more of the ends of the opening 6 and positions where the electrode terminals 30 and 31 can be extended in the opening 6 (for example, substantially opposite ends of the opening 6 or At the position equivalent to this).
The mechanical strength of the external terminals 32 and 33 can be improved if the external terminals 32 and 33 are interposed and locked to the insulating film 4.

Further, in the present embodiment, the external electrodes 32 and 33 are locked to the insulating film 4 by using a plurality of methods at the same time, but any one method or a combination of any two or more methods is used. Thereby, the mechanical strength of the external electrodes 32 and 33 can be improved.

In this embodiment, the current collectors 20, 2
1 is projected from the battery body M and connected to the electrode terminals 30 and 31 at the electrode lead-out portion H, but the electrode terminal 30 connected to the current collectors 20 and 21 in the battery body M has been described. 31 may be drawn out of the battery main body M. In particular, when there are a plurality of positive electrode current collectors 20 or a plurality of negative electrode current collectors 21, two or more current collectors are connected to one electrode terminal in the battery main body M, and the battery main body M Can be taken out from the device.

Embodiment 2 In the first embodiment, the case where the width of the opening is smaller than the width of the electrode terminal has been described. In the present embodiment, the case where the width of the opening is wider than the width of the electrode terminal will be described.

FIG. 7 is a perspective view showing the appearance of an example of the thin battery according to the present invention. In the thin battery 12, the width of the opening 6 is formed wider than the width of the electrode terminal, and the opening 6 is provided only on one surface of the electrode lead-out portion H. Further, it is formed at a position that does not include the tip 4E of the insulating film.

In this case, the external terminals 32 and 33 are not sandwiched by the insulating film 4 at both ends of the opening 6 in the electrode terminal width direction, but are opposed to both ends of the opening 6 in the electrode terminal length direction. Insulation film 4 in part
It is pinched by. Other methods of locking the external electrodes are the same as those in the first embodiment.

The width of the electrode terminals 30 and 31 is about 1 mm to several meters.
m, it may not be easy to provide an opening 6 on the electrode terminal that is narrower than the electrode terminal. Therefore, in the present embodiment, the opening 6 is connected to the electrode terminals 30 and 31.
Is formed wider than the width of the opening 6 to facilitate the alignment of the opening 6 in the manufacturing process.

That is, when the opening 6 is previously provided in the insulating film, the electrode terminal 3 is
In the step of sandwiching 0, 31 between the electrode terminals 30, 31
Alignment of the opening 6 with respect to. When the opening 6 is formed after being sandwiched by the insulating film 4, positioning in the step of forming the opening 6 is facilitated.

In the present embodiment, the external electrodes 32,
The width of 33 can be matched with the width of the electrode terminals 30 and 31. That is, the external electrodes 32 and 33 can have the maximum width. Therefore, the connection area of the external terminals can be increased to reduce the electric resistance, and the connection operation can be facilitated.

In this embodiment, the insulating film 4
The case where two openings 6 are provided in the
One opening 6 may be formed as one opening. FIG. 8 is a perspective view showing the appearance of an example of such a thin battery. This thin battery 13 has 1
Only one opening 6 is provided, and two electrode terminals (the positive terminal 30 and the negative terminal 31) are exposed by the same opening 6. That is, the width of the opening 6 is formed wider than the sum of the width of the two electrode terminals 30 and 31 and the interval between the electrode terminals.

Embodiment 3 In the first and second embodiments, the case where the opening 6 is provided only on one side of the electrode lead-out portion H has been described. In the present embodiment, the case where the opening 6 is provided on both surfaces of the electrode lead-out portion H will be described. .

FIGS. 9A and 9B are perspective views showing the appearance of an example of the thin battery according to the present invention. FIG. 9A is a view of the thin battery 14 as viewed from above, and FIG. FIG. FIG. 10 is a diagram showing a cut surface of the electrode lead-out portion H by the cut surface EE ′ of FIG.

The electrode lead-out portion H of the thin battery 14 has an opening 6U in the upper insulating film 4 and an opening 6D in the lower insulating film 4. The lower opening 6D is provided at a position corresponding to the upper opening 6U, and both surfaces of the same portion of the electrode terminals 30 and 31
U, exposed from 6D.

The upper and lower openings 6U and 6D do not need to completely coincide with each other, but may have a configuration in which a part thereof coincides.
When the upper and lower openings 6U and 6D do not completely coincide with each other, the opening 6 of the first embodiment is merely provided in both the upper and lower insulating films 4, and the same as in the first embodiment. An effect can be obtained.

According to the present embodiment, the upper and lower openings 6 are provided at substantially corresponding positions, and both sides of the same portion of the electrode terminals 30 and 31 are used as external terminals, thereby enabling electrical connection from both sides. Become. Therefore, the external terminals 32, 33
In the case where the power supply terminal is sandwiched between the power supply terminals for electrical connection (for example, in the case of a connector connection), the connection area can be increased without increasing the pressing area.

Embodiment 4 In the first to third embodiments,
Although the case where the opening 6 is provided at a position that does not include the tip 4E of the electrode lead H has been described, in the present embodiment, the case where the opening 6 is extended to the tip 4E of the electrode lead H will be described.

FIG. 11 is a perspective view showing the appearance of an example of a thin battery according to the present invention. In the thin battery 15, the opening 6 is provided only on one surface of the electrode lead-out portion H, and is formed at a position including the tip 4E of the insulating film 4 which is the tip of the electrode terminal.

The opening 6 corresponds to the tip 4E of the insulating film 4.
The electrode lead portion H itself can be used as a male connector in which the insulating film 4 is a connector body and the external terminals 32 and 33 are contact terminals. Therefore, if the power supply terminal is constituted by a female connector, it is possible to connect to the power supply circuit by sliding the electrode lead-out portion H from the end portion 4E side into the female connector.

In this embodiment, the case where the openings 6 are provided on one surface of the electrode lead-out portion H has been described. However, openings 6U and 6D are provided on both surfaces, and both extend to the tip 4E of the insulating film. You may. FIGS. 12A and 12B are views showing the appearance of the thin battery 16 having such a configuration, wherein FIG. 12A is a view of the thin battery 16 as viewed from above, and FIG.
FIG. 3 is a diagram viewed from below.

Embodiment 5 In Embodiments 1 to 4,
The metal foil 40 is exposed in the cross section of the insulating film 4 forming the opening 6. Therefore, an electrical short circuit between the metal foil 40 and the external terminals 32 and 33 may occur. In the present embodiment, a structure for preventing an electrical short between the metal foil 40 and the external terminals 30 and 32 at the end of the opening 6 will be described.

FIG. 13 is an external view of the thin-film battery according to the present invention, as viewed from above the electrode lead-out portion H. The external appearance is exactly the same as that of the thin battery 15 shown in FIG. FIG.
FIG. 3 is a cross-sectional view taken along line FF ′ of FIG.

First opening 60 formed in metal foil 40
Are formed to be larger than the second opening 61 formed in the first insulating film 41 which is the inner surface of the metal foil and the third opening 62 of the second insulating film 42 which is the outer surface of the metal foil, Opening 6
The first and second openings 62 are completely enclosed by the opening 60.
It is located inside 0. Therefore, the end of the metal foil 40 is not in contact with the opening 6. That is, the metal foil 40
The insulating films 41 and 4 are so exposed that the ends of the openings 60 are not exposed.
The insulating films 41 and 42 wrapped and bonded by 2
An end of the opening 6 is formed.

Therefore, the external terminals 32 in the opening 6
An electrical short circuit between the metal foil 33 and the metal foil 40 as a shield can be prevented. Further, it is possible to prevent the external terminals 32 and 33 from being electrically short-circuited via the metal foil 40.

In the thin battery 10, the openings 60 are formed in the metal foil 40 in advance and the openings 61 and 62 are formed in the insulating films 41 and 42 by an opening process such as punching. They can be manufactured by bonding them while performing alignment.

In this embodiment, the end of the insulating film 41 and the end of the insulating film 42 are coincident with each other, but do not necessarily have to coincide with each other. By forming at least the opening 61 of the inner insulating film 41 smaller than the opening 60 of the metal foil 40, a short circuit between the external terminals 32 and 33 and the metal foil 40 can be prevented. Further, by forming the opening 62 of the outer insulating film 42 smaller than the opening 60 of the metal foil 40, it is possible to prevent the metal foil 40 from being exposed to the outside around the external electrodes 32 and 33.

Embodiment 6 FIG. In Embodiments 1 to 5,
Although the case where the electrode terminals 30 and 31 connected to the current collectors 20 and 21 are the external electrodes has been described, in the present embodiment, the case where the current collectors 20 and 21 themselves are the external electrodes will be described.

FIG. 15 is a perspective view showing the appearance of an example of the thin battery according to the present invention, and the appearance is exactly the same as FIG. FIG. 16 is a cross-sectional view taken along the line GG ′ of FIG. The sectional view on the current collector 21 is exactly the same as this figure.

As compared with the case of FIG. 1, the projecting portion of the current collector 20 formed by extracting a part of the current collector 20 from the battery body M is longer, and is held by the insulating film 4 as an electrode terminal. The current collector 20 exposed by the part 6 becomes an external terminal.

The thickness of the current collectors 20 and 21 is about 0.04 m
m or less, and the mechanical strength is extremely low enough to start floating even with a slight air fluctuation, and cannot be used alone as an external terminal. However, the current collectors 20 and 21 are sandwiched by the insulating film 4 to increase the mechanical strength, and the current collectors 20 and 21 in the opening 6 are locked to the insulating film, so that the electrode terminals and the external It can be used as a terminal.

According to this embodiment, the current collectors 20 and 21 are extremely thin and light compared to the conventional external terminals 30 and 31.
Is used as an external electrode, so that a thin battery can be further reduced in weight. In addition, since the electrode terminals 30 and 31 become unnecessary, the number of components can be reduced, and the manufacturing process can be reduced by omitting the connection process.

Embodiment 7 In this embodiment, a circuit element is provided on the electrode lead portion H, and this circuit element is connected to the external electrode 3.
The case of connecting to 2 and 33 will be described. FIG.
FIG. 3 is an external view of an electrode lead-out portion H of the thin battery 18 according to the present invention as viewed from above.

Reference numeral 7 in the figure denotes an overheating and overcurrent protection element made of a material whose electric resistance increases with a rise in temperature. The protection element 7 protects the thin battery 18 by suppressing the battery current based on conduction heat when the temperature of the battery rises and suppressing the battery current based on Joule heat when an overcurrent flows. Such a protection element is a PTC (Positive Tempe).
rature Coefficient) element, thermal protector, etc.

The protection element 7 is fixed to an empty space formed by displacing the electrode terminals 30 and 31 on the electrode lead-out portion H in the electrode terminal width direction. For example, it is bonded on the insulating film 4 using an adhesive or a double-sided tape, and one end (terminal X) is connected to the external terminal 33 in advance. Therefore, by connecting the other end (terminal Y) to the power supply terminal, the external terminal 33 can be connected to the power supply circuit via the protection element 7.

In this manner, a circuit element and an electric circuit composed of a plurality of circuit elements are arranged on the electrode lead portion H and connected to the external electrodes 32 and 33, and the electrode lead portion H is used as a wiring board. Accordingly, it is possible to reduce the size and weight of the thin battery and the entire circuit element connected to the thin battery.

In particular, when the battery body M repeatedly expands and contracts, the circuit elements can be securely arranged and securely connected to the external terminal and the power supply terminal on the electrode lead-out portion H. When the circuit element is a protection element, by arranging the circuit element closer to the external terminal, it is possible to improve the response when the battery is overheated due to conduction heat.

The insulating film 4 forming the electrode lead-out portion H
Openings (not shown) other than opening 6 in insulating film 42 outside
The circuit element or the electric circuit can be connected to the metal foil 40 as a shield if necessary by exposing the metal foil 40 from the opening.

In the first to seventh embodiments, the case where the electrode terminals 30 and 31 are not exposed from the tip end 4E of the electrode lead-out portion H has been described, but at the same time, the conventional thin battery 19 shown in FIG. As in the case of the above, the electrode terminals 30, 31
Can protrude from the tip 4E of the electrode lead-out portion H, and the exposed portion can also be used as an external terminal.

For example, when the wiring path connected to the external electrode in the opening 6 has a relatively large capacitance component, the protruding external terminal can be used together or selectively. .

Embodiment 8 FIG. FIG. 18 is a cross-sectional view of the case where the thin battery 15 shown in FIG. 11 is fixed to a housing of an electronic device.
It is sectional drawing by I 'cut surface. The battery body M of the thin battery 15 is adhered to the housing 80 of the electronic device by an adhesive member 81 such as a double-sided tape. A power terminal 82 is crimped to the external terminal 32 using a pressing member 83.

The pressing member 83 includes a supporting portion 830 having one end engaged with the housing 80 and a pressing portion 831 serving as a screw that is screwed into a screw hole of the supporting portion 830. As a result, the power supply terminal 82 and the external terminal 30
Can be pressed between the pressing portion 831 and the housing 80.
By this crimping, the power supply terminal 82 and the external terminal 30 are electrically connected, and the electrode lead-out portion H of the thin battery 15 can be fixed to the housing 80, and can be easily attached and detached.

It is also possible to removably press-fit by a method not using the pressing member 83. For example, the power supply terminal 82 may be configured as a female connector fixed to the housing 80 and the external terminal 32 may be sandwiched and crimped. Also, the power supply terminal 8
2 may be fixed to the housing 80, and the power supply terminal 82 itself may be configured as a leaf spring for urging the contact surface with the external terminal 30 toward the housing 80. It is needless to say that the power supply terminal can be connected to the external terminal by a method such as soldering without using the pressing member 83.

Embodiment 9 FIG. FIG. 19 is a diagram showing a state in which the thin battery 15 shown in FIG. 11 is fixed to a housing, and (a) is a cross-sectional view taken along the II ′ section.
(B) is sectional drawing by the JJ 'cut surface. The battery main body portion M of the thin battery 15 is fixed to the housing 80 by a fitting holding member 84.

The fitting holding member 84 is formed of a substantially rectangular holding plate having both ends bent, and has a substantially U-shaped cross section. Also, bend the tip of the bent part further outward,
It is a fitting part with the housing 80. On the other hand, on the mounting surface side of the battery main body M of the housing 80, a fitting groove is provided outside along the side surface at the mounting position.

When the bent portion of the fitting holding member 84 is pressed inward and bent, the fitting portion is fitted into the fitting groove, and is engaged with the groove-shaped concave portion formed on the side surface in the fitting groove. The member 84 is fixed to the housing 80. Therefore, if the battery main body M is sandwiched between the fitting holding member 84 and the housing 80, the thin battery 15 can be attached to the housing 80, and can be easily detached.

In this embodiment, the fitting groove having the groove-shaped concave portion is provided in the housing, but a through groove may be provided. FIG. 20 is a diagram showing a state where the thin battery 15 is fixed to such a housing. The fitting holding portion 84 has the bent portion penetrating the housing 80, and the fitting portion engages with the rear surface of the housing 80, and is fixed to the housing 80.

Embodiment 10 FIG. FIG. 21 is a diagram showing a state in which the thin battery 15 shown in FIG. 11 is fixed to a housing, and FIG. 22 is a cross-sectional view taken along the line KK 'of FIG. The thin battery 15 is fixed to the housing 80 by two chuck portions 85, and the power terminals 82 are crimped to the external terminals 32 and 33 by pressing members 83.

The two chuck portions 85 have chuck claw portions having a substantially L-shaped cross section opposed to each other on the housing 80, and a chuck having a substantially U-shaped cross section is formed by the chuck claw portions and the housing 80. Has formed. Therefore, the U-shaped openings of the two chuck portions 85 are opposed to each other, and each sandwich the end of the thin battery 15.

The thin battery 15 is inserted into the chuck portions 85 in order by utilizing the play of the distance between the two chuck portions 85, and is fixed to the housing 80 in a detachable manner. Therefore, the thin battery 1 can be easily attached and detached.

In the eighth to tenth embodiments, the case where the thin battery is fixed to the casing 80 has been described. However, the thin battery is fixed to the member (fixing member) fixed to the casing 80. It is not necessary to fix to the housing 80 itself. For example, it may be a printed board or an electronic component fixing board incorporated in the electronic device, or a battery pack housing engaged with the housing 80.

Embodiment 11 FIG. Embodiments 11 and 12
Next, a mobile phone equipped with a thin battery according to the present invention will be described. First, in this embodiment, a case will be described in which a thin battery is attached to a rear housing of a mobile phone.

FIG. 23 is an explanatory view showing an example of the configuration of a portable telephone with a part thereof cut away. The housing of the mobile phone includes a front housing 80A and a rear housing 80B. The front housing 80A is provided with a display window, a numeric keypad, and the like, and the rear housing 80B is provided with an antenna. Also, the front case 8
A printed circuit board (cell phone main body substrate) 86 having a power supply circuit is stored in a housing 0A, and a thin battery 1 is mounted in a rear housing 80B.
Is stored.

In the thin battery 1, the electrode lead-out portion H extends along the inner surface of the rear housing 80 B and reaches near the side wall of the rear housing 80 B (the upper surface of the mobile phone).
Are connected to the connector 88A via the power supply wiring 89. On the other hand, the power supply wiring 87 connected to the power supply circuit is connected to a connector 88B provided on the printed circuit board 86.
It is connected to the. Therefore, by engaging the front housing 80A and the rear housing 80B, the connector portion 88A,
88B can be electrically connected to each other.

FIG. 24 is an explanatory view showing another example of the structure of the portable telephone in the same manner. In this mobile phone, connectors 88A and 88B are provided around the thin battery 1 in the rear housing 80B. That is, the power supply wiring 87 from the power supply circuit is extended along the inner surface of the rear housing 80B and is connected to the connector 88B disposed near the thin battery 1, while the electrode lead-out portion H of the thin battery 1 is formed short. The external electrodes are connected to a connector 88A via a short power supply wiring 89.

Embodiment 12 FIG.

In this embodiment, a case will be described in which the thin battery according to the present invention is attached to a battery pack housing of a mobile phone. FIG. 25 is an explanatory diagram showing a configuration example of a mobile phone with a part thereof cut away. The housing of the mobile phone includes a front housing 80A, a rear housing 80B, and a battery pack housing 80C.

[0098] The battery pack housing 80C includes a front housing 80A.
Is detachably engaged with the rear housing 80B.
Together with B, it forms a housing on the back side of the mobile phone.
The thin battery 1 is stored in the battery pack housing 80C, and an external terminal of the thin battery 1 is connected to a connector 88A provided at an end of the battery pack housing 80C via a power supply wiring 89.
It is connected to the.

On the other hand, the power supply wiring 87 connected to the power supply circuit on the printed board 86 is wired along the inner surface of the rear housing 80B, and the connector 8 provided at the end of the rear housing 80B.
8B. Therefore, by attaching the battery pack housing 80C (battery pack) containing the thin battery 1 to the mobile phone, the connectors 88A and 88B are detachably electrically connected.

The method of manufacturing a thin battery, an electronic device, and a thin battery having the following features 1 to 15 may be used. 1. A plate-shaped battery body, an electrode terminal connected to the plate-shaped battery body, and an insulating film sandwiching the electrode terminal are provided, and an opening for exposing the electrode terminal is provided in the sandwiched portion of the insulating film. Thin battery. 2. The insulating film sandwiches the electrode terminal via an adhesive, and the electrode terminal in the opening is bonded to the insulating film on the side opposite to the opening.
A thin battery according to claim 1. 3. 2. The thin battery according to claim 1, wherein the electrode terminals are sandwiched by insulating films at substantially opposite ends of the opening. 4. The thin battery according to any one of claims 1 to 3, wherein the opening is provided at an end of the insulating film. 5. The battery according to any one of claims 1 to 4, wherein the battery body is a plate-shaped battery in which a stacked structure of a positive electrode, a separator, and a negative electrode is covered with the insulating film together with a positive electrode current collector and a negative electrode current collector. Thin battery.

6. The positive electrode current collector or the negative electrode current collector constituting the battery main body is formed to have a protruding portion from the battery main body, and a part of the positive electrode current collector or the negative electrode current collector is used as the electrode terminal. 6. The thin battery according to the above item 5, wherein 7. Wherein the insulating film is a part of the insulating film covering the battery body.
A thin battery according to any one of the above. 8. The thin battery according to any one of claims 1 to 7, wherein a circuit element is provided on the insulating film, and one terminal of the circuit element is connected to an electrode terminal in the opening. 9. The insulating film is made of a metal foil having a first insulating film formed on an inner surface, a first opening is provided in the metal foil, a second opening is provided in the first insulating film, and the second opening is provided. The first opening is formed in a first opening;
9. The thin battery according to any one of claims 1 to 8. 10. The insulating film is made of a metal foil having a second insulating film formed on an outer surface, a first opening is provided in the metal foil, a third opening is provided in the second insulating film, and the third opening is provided. The thin battery according to any one of the above items 1 to 9, which is formed in the first opening.

11. A power supply circuit having a power supply terminal, and the thin battery according to any one of 1 to 7, wherein the power supply terminal is crimped to an electrode terminal in the opening to connect the thin battery to the power supply circuit. Electronic equipment. 12. The electrode terminal in the opening, together with a power supply terminal, is sandwiched by a fixing member fixed to the housing or the housing and a pressing member engaged with the housing or the fixing member. Electronic device as described. 13. The power terminal is formed as a female connector;
The electronic device according to claim 11, wherein the insulating film is inserted into a female connector from an end, and an electrode terminal in the opening is connected to a power supply circuit. 14． 14. The electronic device according to the above 13, wherein the female connector is fixed to a housing or a fixing member fixed to the housing. 15. A first opening step of forming a first opening in the metal foil, a second opening step of forming a second opening in the first insulating film, and a third opening in the second insulating film The third opening step and the alignment of the first to third openings are performed, and a first insulating film is bonded to one surface of the metal foil, and a second insulating film is bonded to the other surface. A thin battery comprising: a laminating step of forming a film; and a clamping step of positioning the electrode terminals through the first to third openings so that the electrode terminals are exposed from the insulating film, and clamping the electrode terminals with the insulating film. Production method.

The thin batteries, electronic devices, and methods for manufacturing thin batteries described in 1 to 15 above have the following objects. An object is to improve the mechanical strength of external terminals of a thin battery while reducing the weight of the thin battery. In addition, the external terminals of the thin battery and the power supply terminal are crimped (for example, connector connection) while reducing the weight of the thin battery.
It is another object of the present invention to facilitate connection work to a power supply circuit. Another object of the present invention is to increase the mechanical strength of the external terminals so that the external terminals are electrically connected and the thin battery is fixed to the electronic device at the same time. In addition, the present invention provides a thin and lightweight thin battery by reducing the thickness and weight of the external terminals, and further provides a small and lightweight electronic device such as a mobile phone by incorporating the thin battery. The purpose is to:

[0104]

In the thin battery according to the present invention, an opening is provided in the insulating film sandwiching the electrode terminal, and the electrode terminal in the opening is locked to the insulating film. For this reason, the mechanical strength can be increased while reducing the size and weight of the electrode terminal. This also facilitates electrical connection by contact. Furthermore, the work of assembling into an electronic device is facilitated by the improvement in strength and the contact connection.

Further, in the electronic device according to the present invention, the power supply terminal connected to the power supply circuit is connected by crimping to the electrode terminal in the opening provided in the thin battery. Therefore, the assembling work and the battery replacing work are facilitated, and the batteries can be securely connected. Therefore, the yield at the time of manufacturing the electronic device and the reliability of the damaged electronic device can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of an example of a thin battery according to the present invention (Embodiment 1).

FIG. 2 is a cross-sectional view of the thin battery illustrated in FIG. 1 taken along the line AA ′, and is a diagram illustrating a structure of a battery main body M.

3A is a cross-sectional view taken along the line BB ′ shown in FIG. 1, and FIG. 3B is an enlarged view of a part of FIG. It is a thing.

FIG. 4 is a cross-sectional view taken along the line CC ′ shown in FIG. 1;

FIG. 5 shows a single insulating film for electrode terminals 30, 3;
FIG. 2 is a diagram showing the appearance of a thin battery 11 that holds the battery 1.

FIG. 6 is a cross-sectional view taken along the line D-D ′ of FIG. 5;

FIG. 7 is a perspective view showing an appearance of an example of a thin battery according to the present invention (Embodiment 2).

FIG. 8 is a perspective view showing an external appearance of an example of a thin battery in which two openings 6 are formed as one opening.

FIGS. 9A and 9B are perspective views showing the appearance of an example of the thin battery according to the present invention, wherein FIG. 9A is a view of the thin battery 14 as viewed from above, and FIG. 9B is a view of the thin battery 14 as viewed from below. It is a figure (Embodiment 3).

FIG. 10 shows an electrode lead-out portion H formed by a cut plane EE ′ in FIG.
FIG. 3 is a view showing a cut surface of FIG.

FIG. 11 is a perspective view showing an appearance of an example of a thin battery according to the present invention (Embodiment 4).

FIG. 12 is a diagram showing the appearance of a thin battery 16 provided with openings on both sides and both extending to the tip of the insulating film, where (a) is a view of the thin battery 16 as viewed from above,
(B) is the figure which looked at the thin battery 16 from the lower side.

FIG. 13 is an external view of an electrode lead-out portion H of a thin battery according to the present invention as viewed from above (Embodiment 5).

FIG. 14 is a sectional view taken along the line FF ′ in FIG. 13;

FIG. 15 is a perspective view showing an appearance of an example of a thin battery according to the present invention (Embodiment 6).

FIG. 16 is a sectional view taken along the line GG ′ of FIG. 15;

FIG. 17 shows an electrode lead-out portion H of the thin battery 18 according to the present invention.
FIG. 14 is an external view of the device viewed from above (Embodiment 7).

18 is a cross-sectional view taken along the line II ′ when the thin battery 15 shown in FIG. 11 is fixed to a housing of an electronic device (Embodiment 8).

19A and 19B are diagrams illustrating a state in which the thin battery 15 illustrated in FIG. 11 is fixed to a housing, where FIG. 19A is a cross-sectional view taken along the line II ′, and FIG. It is sectional drawing by J 'cut surface (Embodiment 9).

FIG. 20 is a diagram showing a state in which a thin battery 15 is fixed to a housing provided with a through groove.

21 is a diagram showing a state in which the thin battery 15 shown in FIG. 11 is fixed to a housing (Embodiment 10).

FIG. 22 is a sectional view taken along the section line KK ′ of FIG. 21;

FIG. 23 is an explanatory view showing a configuration example of a mobile phone according to the present invention with a part thereof cut away (Embodiment 1);
1).

FIG. 24 is an explanatory view showing another configuration example of the mobile phone according to the present invention, with a part thereof cut away.

FIG. 25 is an explanatory diagram showing a configuration example of a mobile phone according to the present invention with a part thereof cut away (Embodiment 1);
2).

FIG. 26 is a perspective view showing the appearance of a conventional thin battery.

[Description of Signs] 10-19 Thin battery M Battery main body, H electrode lead-out part 20 Positive electrode current collector, 21 Negative electrode current collector 22 Positive electrode, 23 Negative electrode 24 Separating material 30, 31 Electrode terminal, 32, 33 External terminal 4 Insulating film, 40 metal foil 41 first insulating film, 42 second
Insulating film 4E End of insulating film 5 Adhesive 6 Opening, 60 First
Opening 61 second opening 62 third
Opening 7 circuit element 80 housing 81 bonding member 82 power supply terminal 82 pressing member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 10/48 301 H01M 10/48 301

Claims (8)

[Claims] 1. A plate-shaped battery body, and a lead-out portion formed by sandwiching an electrode terminal connected to the plate-shaped battery body with an insulating film, wherein the electrode terminal is exposed at a sandwiched portion of the insulating film. A thin battery wherein an opening is provided, a circuit element is fixed on the insulating film, and one terminal of the circuit element is connected to an electrode terminal in the opening. 2. The thin battery according to claim 1, wherein the circuit element is a temperature-sensitive protection element. 3. The thin battery according to claim 1, wherein the plate-shaped battery is a plate-shaped lithium-ion battery, and the circuit element is fixed to the drawer. 4. An opening for exposing the metal foil to a second insulating film, wherein the insulating film is made of a metal foil having a first insulating film formed on an inner surface and a second insulating film formed on an outer surface. And
The thin battery according to claim 1, wherein one terminal of the circuit element is connected to the metal foil in the opening. 5. The plate-shaped battery body is substantially rectangular, and the circuit element is fixed in a space formed by disposing two electrode terminals on one side of the plate-shaped battery body. 2. The thin battery according to 1. 6. The insulating film is made of a metal foil having a first insulating film formed on an inner surface, a first opening is provided in the metal foil, and a second opening is provided in the first insulating film.
The thin battery according to claim 1, wherein the second opening is formed in the first opening. 7. The insulating film is made of a metal foil having a second insulating film formed on an outer surface, a first opening is provided in the metal foil, and a third opening is provided in the second insulating film.
The thin battery according to claim 1, wherein the third opening is formed in the first opening. 8. A power supply circuit having a power supply terminal;
An electronic device, comprising: a thin battery according to any one of claims 1 to 3, wherein a power terminal is crimped to an electrode terminal in the opening to connect the thin battery to a power circuit.