JP2001093491A - Plate type battery and portable wireless terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate type battery comprising an outer electrode which has sufficient mechanical strength. SOLUTION: A plate type battery 1 is connected with a generation element including a current collecting body 7a and with the current collecting body 7a. The plate type battery 1 comprises an electrode terminal member 4a which has a thickness thicker than that of the current collecting body 7a, a cell part 3 which holds the generation element inside thereof, armor members 6a and 6b which seal the generation element in the cell part 3 and include sealing parts 2a where at least a part of the electrode terminal member 4a is positioned, and sealing reinforcement means 5a and 5b which reinforce the sealing at the part of the sealing parts 2a of the armor members 6a and 6b where the electrode terminal member 4a is positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar battery and a portable wireless terminal, and more particularly, to a planar battery provided with an electrode terminal having sufficient mechanical strength and a portable wireless terminal using the same.

[0002]

2. Description of the Related Art In recent years, electronic devices, especially portable wireless terminals such as portable telephones, personal information terminals, and notebook personal computers having a communication function, have been rapidly reduced in size and weight. With the miniaturization and weight reduction of such electronic devices, there is a strong demand for miniaturization and weight reduction of batteries used as power supplies for these electronic devices.

[0003] In order to meet the above demands, development of a plate-shaped battery in which a power generation element including an electrode and an electrolyte is hermetically sealed with an exterior member such as a laminate film to achieve a smaller and lighter weight than in the past. Have been. FIG. 11 is a schematic perspective view showing a conventional plate battery. A conventional plate battery will be described with reference to FIG.

Referring to FIG. 11, a plate-shaped battery 101 has a power generating element held inside a laminate film 6 as an exterior member and a power supply element for supplying a current from the power generating element to the outside of the plate-shaped battery 101. External electrodes 107a, 107b
And The laminate film 6 includes a cell section 103 for holding the power generation element therein and a cell section 103 for holding the power generation element.
And sealing portions 102a and 102b for hermetic sealing.
The external electrodes 107a and 107b are formed so as to extend from the power generation element held inside the cell portion 103 to the outside of the plate-shaped battery 101 via the sealing portion 102a. The power generation element includes a positive electrode, a negative electrode, and an electrolyte. As the positive electrode, for example, a material obtained by applying an active material to an aluminum foil as a current collector having a predetermined thickness can be used. As the negative electrode, for example, a material in which a copper foil as a current collector having a predetermined film thickness is coated with an active material can be used. An electrolyte is held between the positive electrode and the negative electrode. The current collectors of the positive electrode and the negative electrode are drawn out of the plate-shaped battery 101 and used as the external electrodes 107a and 107b.
As the external electrodes 107a and 107b, a metal foil made of, for example, nickel, aluminum, or copper and having a thickness of about several tens of micrometers can be used.

[0005]

When the plate-shaped battery 101 shown in FIG. 11 is applied to a portable telephone or the like, the external electrodes 107a and 107b made of metal foil and the electrode terminals on the portable telephone are mechanically connected. By contact, the power from the plate battery 101 is supplied to the mobile phone. However, as described above, since the metal foil forming the external electrodes 107a and 107b is very thin, the mechanical strength is insufficient for use as a connection terminal to a mobile phone or the like. Therefore, when the operation of attaching and detaching the plate-shaped battery 101 to and from a mobile phone is repeated a plurality of times, the external electrodes 107a and 107b
However, there has been a problem that the wire is broken or cut by an external force during the attaching / detaching operation. For this reason, there has been a strong demand for a plate-shaped battery provided with an external electrode having a mechanical strength enough to withstand repeated attachment / detachment operations to a cellular phone or the like.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide:
An object of the present invention is to provide a plate-shaped battery including external electrodes having sufficient mechanical strength.

Another object of the present invention is to provide a portable wireless terminal in which the external electrodes of the plate-shaped battery are not damaged even when the operation of attaching and detaching the plate-shaped battery is performed.

[0008]

A plate-like battery according to one aspect of the present invention includes a power generating element, an electrode terminal member, an exterior member, and sealing reinforcement. The power generating element includes a current collector. The electrode terminal member is connected to the current collector and has a thickness greater than the thickness of the current collector. The exterior member includes a cell portion that holds the power generation element inside, and a sealing portion that seals the power generation element in the cell portion and at least a part of the electrode terminal member is located.
The sealing reinforcing means reinforces the sealing of the region where the electrode terminal member is located in the sealing portion of the exterior member (claim 1).

In this case, since the electrode terminal member having a thickness larger than the thickness of the current collector is provided, the electrode terminal member having sufficient mechanical strength can be used as an external electrode of the plate battery. For this reason, the mechanical strength of the external electrode can be increased as compared with the conventional case where an external electrode made of a thin metal foil is used as the external electrode. As a result, even if the operation of attaching and detaching the plate-shaped battery according to the present invention to a mobile phone or the like is repeated, it is possible to prevent the problem that the electrode terminal member acting as the external electrode is cut off.

Further, since the thickness of the electrode terminal member is larger than the thickness of the metal foil (current collector) conventionally used as an external electrode, the electrode terminal member extends from the cell portion to the outside of the exterior member. In the case where the sealing member is formed by sealing the exterior member of the portion where the terminal member is disposed by a process such as thermocompression bonding, it is difficult to uniformly seal the periphery of the electrode terminal member with the exterior member. In particular, if the electrode terminal member is not thick, a gap is easily formed between the side surface of the electrode terminal member and the exterior member so as to extend from the inside (cell portion) of the exterior member to the outside of the exterior member. . Such a gap causes contents such as an electrolyte sealed in the cell portion of the plate-shaped battery to leak out of the plate-shaped battery.
Therefore, in the plate-shaped battery according to the present invention, the sealing in the region where the electrode terminal member is located is reinforced by sealing reinforcing means such as a sleeve member described later. Accordingly, there is a problem that the electrolyte solution or the like constituting the power generation element leaks from the cell portion to the outside of the plate battery through the gap of the sealing portion due to the thick electrode terminal member. Occurrence can be prevented.

[0011] In the plate-shaped battery according to the above aspect, it is preferable that the sealing reinforcing means includes a sleeve member arranged so as to surround the electrode terminal member located at the sealing portion.

With this configuration, the sleeve member can be disposed so as to be in close contact with the side surface of the electrode terminal member by using a highly deformable resin or the like as the material of the sleeve member. At the same time, the shape of the outer surface of the sleeve member can be determined so that the outer member is deformed in a deformable range so that the outer member can adhere to the outer surface of the sleeve member located on the side surface of the electrode terminal member. As a result, it is possible to reliably prevent the occurrence of an accident such as leakage of the electrolyte or the like constituting the power generation element from the cell portion to the outside through the gap between the side surface of the electrode terminal member and the exterior member.

[0013] In the plate-shaped battery according to the above aspect, it is preferable that the sleeve member is disposed so as to surround a connection portion between the current collector and the electrode terminal member.

With this configuration, the sleeve member can be used as a reinforcing member for reinforcing the connection between the current collector and the electrode terminal member. For this reason, the mechanical strength of the connection between the current collector and the electrode terminal member can be further increased. As a result, it is possible to reliably prevent the occurrence of a problem such as separation of the connection portion.

[0015] In the plate battery according to the above aspect, it is preferable that the sealing reinforcing means includes forming the electrode terminal member located at the sealing portion into a bent shape.

According to this configuration, the length of the electrode terminal member located at the sealing portion can be made longer than when a linear electrode terminal member is used. If at least one of the electrode terminal members located in the sealing portion can form a contact area where the electrode terminal member and the exterior member are in close contact with each other over the entire periphery of the electrode terminal member, the electrolyte of the power generating element or the like may be in a plate-like shape. Leakage to the outside of the battery can be prevented. Then, by increasing the length of the electrode terminal member located at the sealing portion, it is possible to increase the area where the contact area can be formed. For this reason, the probability that the contact region is formed can be increased. As a result, it is possible to reduce the risk that the electrolyte or the like leaks out of the plate battery.

In the plate battery according to the one aspect, it is preferable that the connecting portion between the electrode terminal member and the current collector is located at the sealing portion.

With this configuration, the sealing portion can be used as a reinforcing member for reinforcing the connection between the electrode terminal member and the current collector. As a result, it is possible to prevent a problem that the electrode terminal member and the current collector are separated from each other at the connection portion.

A plate-shaped battery according to another aspect of the present invention includes a power generating element, an electrode terminal member, and an exterior member. The power generating element includes a current collector. The electrode terminal member is connected to the current collector and has a thickness greater than the thickness of the current collector. The exterior member seals the cell part holding the power generation element inside and the cell part with the power generation element. The connecting portion between the electrode terminal member and the current collector is located at the sealing portion (claim 6).

In this case, since the thickness is larger than that of the current collector, an electrode terminal member having sufficient mechanical strength can be used as an external electrode of the plate-shaped battery.
The mechanical strength of the external electrode can be increased as compared with the conventional case where a current collector using a metal foil or the like is used as the external electrode. As a result, when the operation of attaching and detaching the plate-shaped battery to and from a portable wireless terminal such as a mobile phone is repeated, it is possible to prevent a problem that stress is applied to the external electrode and damage to the external electrode occurs.

Further, since the connecting portion between the electrode terminal member and the current collector is located in the sealing portion, the sealing portion is used as a reinforcing member for increasing the mechanical strength of the connecting portion. Can be. As a result, it is possible to prevent a problem that the electrode terminal member and the current collector are separated at the connection portion.

In the plate battery according to the one aspect or the other aspect, it is preferable that a conductive layer is formed on the surface of the electrode terminal member.

In this way, it is possible to reduce the contact resistance when a terminal or the like is externally brought into contact with the electrode terminal member as an external electrode. As a result, the electrical connection between the electrode terminal member and the mobile phone or the like can be made more reliably.

When a stable material which is relatively hard to be oxidized is used as a material of the conductive layer, and when a material which is easily oxidized such as aluminum is used as a material of the electrode terminal member, the conductive layer prevents the electrode terminal member from being oxidized. It can be used as an oxidation-resistant protective film.

[0025] In the plate battery according to the one aspect or the other aspect, the conductive layer is preferably a layer formed by plating.

In this way, since the conductive layer is formed by using a plating method whose process cost is lower than that of the sputtering method or the like, it is possible to prevent the manufacturing cost of the plate-shaped battery from increasing. Further, various materials such as gold to which a plating method can be applied can be used as a material of the conductive layer.

In the plate battery according to the one aspect or the other aspect, it is preferable that the electrode terminal member contains iron or stainless steel.

As described above, if iron or the like having relatively high mechanical strength is used as the electrode terminal member, a relatively inexpensive electrode terminal member having sufficient mechanical strength can be obtained. As a result, the manufacturing cost of the plate battery can be reduced. In addition, iron and the like may be corroded by the electrolyte of the power generation element. However, if the electrode terminal member is arranged so as to be located only outside the sealing portion and the plate-shaped battery, the electrode terminal member is eroded by the electrolyte. Corrosion can be easily prevented.

[0029] In the plate battery according to the one aspect or the other aspect, it is preferable that the electrode terminal member is embedded in the sealing portion of the exterior member.

In this case, the plate-shaped battery can be more securely sealed than when the electrode terminal member extends from the end of the sealing portion to the outside. As a result, it is possible to reliably prevent an accident such as leakage of the electrolyte or the like constituting the power generation element to the outside of the plate-shaped battery through the region where the electrode terminal member exists.

Further, since the electrode terminal member is embedded in the sealing portion, the sealing portion can be used as a reinforcing member for reinforcing the mechanical strength of the electrode terminal member. As a result, the mechanical strength of the electrode terminal member can be further improved.

In the plate battery according to the first aspect or the other aspect, it is preferable that an opening for exposing the surface of the electrode terminal member is formed in the sealing portion of the exterior member.

In this way, the electrode terminal member as an external electrode embedded in the sealing portion can be electrically connected to a portable telephone or the like via this opening.

[0034] In the plate battery according to the one aspect or the other aspect, the sealing portion of the exterior member includes an upper surface and a lower surface located on the opposite side to the upper surface, and an opening is formed on the upper surface of the sealing portion. Is preferred.

In this way, the connection between the plate-shaped battery and the electronic device can be easily performed from the upper surface of the sealing portion of the plate-shaped battery (from the direction perpendicular to the surface of the plate-shaped battery).

[0036] In the plate battery according to the one aspect or the other aspect, it is preferable that the opening is formed on both the upper surface and the lower surface of the sealing portion of the exterior member.

In this way, the electrical connection to the plate battery can be made from either the upper surface or the lower surface of the sealing portion. As a result, the degree of freedom in designing a portable wireless terminal using the plate battery according to the present invention can be improved.

[0038] A portable wireless terminal according to another aspect of the present invention includes the plate-shaped battery according to the one aspect or the other aspect (claim 12).

In this case, since the plate-shaped battery according to one aspect or another aspect of the present invention is used, damage to the external connection terminal of the plate-shaped battery occurs when the operation of attaching and detaching the plate-shaped battery to the portable wireless terminal is repeated. Thus, it is possible to prevent a problem that a failure occurs in the portable wireless terminal due to the operation.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

(Embodiment 1) FIG. 1 is a schematic perspective view showing Embodiment 1 of a plate battery according to the present invention. The plate-shaped battery will be described with reference to FIG.

Referring to FIG. 1, a plate-shaped battery 1 includes a power generation element, a laminated film 6 as an exterior member, electrode tabs 4a and 4b as electrode terminal members, and sealing reinforcing members 5a and 5b as sealing reinforcing means. And The power generating element is hermetically held inside the cell portion 3 of the laminate film 6.
The sealing portions 2a and 2b are bonded by heating and pressing the laminated film 6. The electrode tab 4a is thicker than the current collector 7a and has sufficient mechanical strength as shown in FIG. The electrode tab 4a is connected to the current collector 7a of the power generation element at the sealing portion 2a. The connection between the electrode tab 4a and the current collector 7a is performed using a welding method such as a spot welding method. A weld 8 is formed at the connection between the electrode tab 4a and the current collector 7a. FIG. 2 is a schematic partial cross-sectional view of the sealing portion of the plate-shaped battery shown in FIG.

A sealing reinforcing member 5a made of a resin film is arranged so as to surround the electrode tab 4a. The sealing reinforcing member 5a is arranged so as to surround a welded portion 8 which is a connection portion between the electrode tab 4a and the current collector 7a. And
The electrode tab 4a and the sealing reinforcing member 5a are connected to the sealing portion 2a.
Is fixed by pressure bonding while being held by the laminate films 6a and 6b. In addition, the electrode tab 4b also
Basically, like the electrode tab 4a, it is connected to the current collector of the power generating element, and the sealing reinforcing member 5b is arranged so as to surround the periphery.

As shown in FIGS. 3 and 4, the width L1 of the sealing reinforcing member 5a is larger than the width L0 of the electrode tab 4a. The thickness of the sealing reinforcing member 5a is the electrode tab 4a.
Sufficiently smaller than the thickness of As a material of the sealing reinforcing members 5a and 5b, polypropylene, polyethylene, polyethylene terephthalate, or the like can be used. 3 is a schematic partial plan view of the plate-shaped battery shown in FIG. 1, and FIG. 4 is a schematic partial side view of the plate-shaped battery shown in FIG.

Referring to FIG. 4, sealing reinforcing member 5a is in close contact with the surface of electrode tab 4a. Further, the sealing reinforcing member 5a at the end portions 16a, 16b of the sealing reinforcing member 5a.
The angle (tilt angle) between the surface of the film and the crimping surface 19 of the laminate films 6a and 6b can be made sufficiently small. Therefore, at the ends 16a and 16b of the sealing reinforcing member 5a, the laminated films 6a and 6b can be sufficiently deformed so as to follow the shape of the sealing reinforcing member 5a. Therefore, the sealing reinforcing member 5a and the laminate films 6a and 6b can be pressed together without forming a gap.

The electrode tabs 4a and 4b function as external electrodes to be connected to a connection member such as a connector formed on the portable radio terminal when the plate-shaped battery 1 is incorporated into a portable radio terminal such as a portable telephone.

As described above, in the plate-shaped battery according to the present invention shown in FIGS. 1 to 4, the electrode tabs 4a and 4b having a thickness larger than the current collector 7a can be used as the external electrodes. The mechanical strength of the external electrode can be improved as compared with the case where the current collector 7a made of a simple metal foil is used as the external electrode as it is. As a result, even if the operation of attaching and detaching the plate-shaped battery according to the present invention to the portable wireless terminal or the like is repeated, it is possible to prevent the problem that the external electrode portion is cut off.

In a conventional plate-shaped battery, when simply using a thick electrode tab (when the electrode tabs 4a and 4b are directly pressed and fixed with the laminate films 6a and 6b from above and below), the electrode tab is not used. On the side surfaces of the tabs 4a and 4b, the laminate films 6a and 6b are
In some cases, a gap was formed without being pressed against the side surfaces of a and 4b. However, the plate-shaped battery 1 according to the present invention shown in FIGS.
Is provided with the sealing reinforcing members 5a and 5b, so that the formation of such a gap can be reliably prevented. As a result, an accident such as leakage of the electrolyte constituting the power generation element held inside the cell portion 3 of the plate-shaped battery 1 from the region where the electrode tabs 4a and 4b are formed to the outside of the plate-shaped battery 1 is caused. Can be prevented.

That is, it is possible to improve the mechanical strength of the external electrode, and at the same time, it is possible to prevent the problem that the material constituting the power generation element of the plate-shaped battery 1 leaks out of the plate-shaped battery 1.

As shown in FIGS. 2 and 3, since the sealing reinforcing member 5a surrounds the connection between the electrode tab 4a and the current collector 7a, the electrode tab 4a and the current collector 7a are arranged.
The sealing reinforcing member 5a can be used as a reinforcing member that mechanically reinforces a connection portion with the sealing member 5a. As a result, it is possible to prevent such a problem that the connection portion between the electrode tab 4a and the current collector 7a peels off.

As shown in FIGS. 2 and 3, the connection between the electrode tab 4a and the current collector 7a is located at the sealing portion 2a which is a crimping portion of the laminate films 6a and 6b. The connection between the electrode tab 4a and the current collector 7a can be reinforced by the laminated films 6a and 6b of the sealing portion 2a. As a result, occurrence of a defect such as separation of the electrode tab 4a and the current collector 7a can be more reliably prevented.

The electrode tabs 4a, 4b may be made of nickel, aluminum, copper, or the like. Further, as the laminated films 6a and 6b,
A structure in which an aluminum foil is sandwiched between polymer resins such as polypropylene or polyethylene can be used.

The plate battery 1 shown in FIGS. 1 to 4 can be manufactured, for example, by the following steps. The end of the laminated film 6 cut in a predetermined shape in advance is sealed by thermocompression bonding and processed into an envelope shape. This envelope-shaped laminated film 6 has at least one opening.
Electrode tabs 4a and 4b are welded to the current collector of the power generating element. The sealing reinforcing members 5a and 5b are wound around the connection portions between the electrode tabs 4a and 4b and the current collector, and are pressed and fixed. The power generating element to which the electrode tabs 4a and 4b are connected is inserted into the laminate film 6. The electrode tabs 4a and 4b are
3 is arranged to extend from the inside to the outside. The power generating element or the laminate film 6 is so positioned that the connection between the electrode tabs 4a, 4b and the peripheral body is located at a position to be a sealing portion.
Adjust the position of. After supplying an electrolytic solution or the like to the power generating element inside the laminated film 6, the opening is sealed.

FIG. 5 is a schematic partial sectional view showing a modification of the first embodiment of the plate battery according to the present invention shown in FIGS. FIG. 5 corresponds to FIG. Referring to FIG.
The plate-shaped battery will be described.

Referring to FIG. 5, the plate-shaped battery basically has the same structure as the plate-shaped battery shown in FIGS. 1 to 4, except that electrode tab 4a has a core material 9 made of a conductor such as metal. And a surface layer 10 as a conductive layer. The surface layer 10 is made of a material having a low electric resistance, such as gold, and is formed using a plating method. The other electrode tab 4b of the plate battery has the same structure as the electrode tab 4a.

As described above, when the surface layer 10 made of gold or the like having a small electric resistance is formed on the surface of the electrode tab 4a, in addition to the effects obtained by the plate battery shown in FIGS.
When the plate battery according to the present invention is applied to a portable wireless terminal or the like, the contact resistance between the electrode tab 4a as an external connection terminal and a connecting member such as a connector of the portable wireless terminal can be reduced.

If a stable material such as gold which is relatively resistant to oxidation is used as the material of the surface layer 10, the electrode tab 4a
When a material that easily oxidizes, such as aluminum, is used as the material for this, the surface layer 10 can be used as an oxidation-resistant protective film that prevents oxidation of the electrode tab 4a.

If the surface layer 10 is a plating layer formed by a plating method, any material can be used as the surface layer 10 of the electrode tab 4a as long as the material can be formed by the plating method. Further, the surface layer 10 can be formed at lower cost than when a process such as a sputtering method is used.

Further, iron or stainless steel may be used as the electrode tab 4a of the plate battery shown in FIGS. 1 to 4 or the core material 9 of the plate battery shown in FIG. In this case, it is possible to manufacture the electrode tab 4a having sufficient strength at low cost.

(Embodiment 2) FIG. 6 is a schematic partial perspective view showing Embodiment 2 of a plate battery according to the present invention, and FIG. 7 is a sealing portion 2a of the plate battery shown in FIG. FIG. The plate-shaped battery will be described with reference to FIGS.

Referring to FIGS. 6 and 7, the plate-shaped battery basically has the same structure as the plate-shaped battery shown in FIGS. However, in the plate battery shown in FIGS. 6 and 7, the electrode tabs 4a and 4b are in a state of being embedded in the sealing portion 2a. Then, as shown in FIG. 7, the electrode tabs 4a, 4b
Are located at substantially the same positions as the end side surfaces of the sealing reinforcing member 5a and the laminate film 6b. In the regions located above the electrode tabs 4a and 4b, the laminate film 6a and the sealing reinforcing members 5a and 5b are partially removed so that the cutouts 12 as openings are formed.
a and 12b are formed. These notches 12a, 12
b, the upper surfaces 11a, 1b of the electrode tabs 4a, 4b.
1b is exposed.

According to the plate-shaped battery shown in FIGS. 6 and 7,
In addition to the effects obtained by the plate-shaped battery shown in FIGS. 1 to 4, the electrode tabs 4a and 4b are in a state of being embedded in the sealing portion 2a.
Can be used as a reinforcing member. As a result, as compared to the case where the electrode tabs 4a and 4b are formed so as to extend from the side of the sealing portion 2a to the outside as shown in FIGS. The strength of the electrode can be further improved.

The electrode tabs 4a and 4b as external electrodes embedded in the sealing portion 2a can be electrically connected to a portable telephone or the like via the openings 12a and 12b.

(Embodiment 3) FIG. 8 is a schematic partial sectional view showing Embodiment 3 of a plate battery according to the present invention. FIG. 8 corresponds to FIG. With reference to FIG. 8, a plate-shaped battery will be described.

Referring to FIG. 8, the plate-shaped battery is basically similar to that shown in FIG.
8 has the same structure as the plate-shaped battery shown in FIGS. 7 and 8, but in the plate-shaped battery shown in FIG. 8, the electrode tab 4a is completely embedded in the sealing portion 2a. An opening 13a is formed in the laminated film 6 and the sealing reinforcing member 5a located on the electrode tab 4a.
The upper surface 11a of a is exposed. The planar shape of the opening 13a is circular, but may be elliptical, rectangular, or the like. The width of the opening 13a is preferably smaller than the width of the electrode tab 4a. In this way, at the end of the electrode tab 4a, the sealing reinforcing member 5a and the laminate film 6
The electrode tab 4a can be reliably fixed by a, and at the same time, the sealing can be reliably performed.

The end region 1 where the laminate films 6a and 6b are fixed to each other by pressure bonding is provided at the extreme end of the sealing portion 2a.
7 are formed. By the end region 17, sealing at the sealing portion 2a can be performed more reliably.

When the plate-shaped battery shown in FIG. 8 is mounted on a cellular phone or the like, a connector or the like is brought into contact with the upper surface 11a of the electrode tab 4a through the opening 13a to thereby form the sealing portion 2a. A mobile phone or the like and a plate-shaped battery can be easily connected from above (from above).

As described above, since the electrode tab 4a is buried in the sealing portion 2a, even when the thickness of the electrode tab 4a is sufficiently larger than the thickness of the current collector 7a, the sealing is reliably performed. Can do it. As a result, it is possible to prevent an accident such as leakage of the power generation element electrolyte or the like to the outside of the plate battery due to the presence of the electrode tab 4a. Note that the other electrode tab 4b (see FIG. 1) of the plate battery has the same structure as the electrode tab 4a shown in FIG.

FIG. 9 is a schematic partial sectional view showing a modification of the plate-shaped battery according to the third embodiment of the present invention shown in FIG. Referring to FIG. 9, the plate battery basically has the same structure as the plate battery shown in FIG. 8, but a surface layer 14a as a conductive layer having a low electric resistance is formed on the surface of electrode tab 4a. Have been. This surface layer 14a is preferably formed using a plating method, similarly to the surface layer 10 of the plate-shaped battery shown in FIG. In this case, in addition to the effects obtained by the plate battery shown in FIG. 8, the effects obtained by the plate battery shown in FIG. 5 can be further obtained.

In the plate-shaped battery shown in FIG. 8, the opening 13a is connected to the upper surface of the sealing portion 2a (the laminate film 6a).
Side), the opening for exposing the lower surface of the electrode tab 4a is formed on the lower surface side of the sealing portion 2a (the laminate film 6).
b side).

In this way, electrical connection to the plate-shaped battery can be made from either the upper surface or the lower surface of the sealing portion 2a. As a result, the degree of freedom in designing a mobile wireless terminal such as a mobile phone using the plate battery according to the present invention can be improved.

(Embodiment 4) FIG. 10 is a schematic partial plan view showing Embodiment 4 of a plate battery according to the present invention.
FIG. 10 corresponds to the schematic partial plan view shown in FIG. The plate-shaped battery will be described with reference to FIG.

Referring to FIG. 10, electrode tab 4 of the plate-shaped battery
a has a meandering portion 15a having a bent shape whose planar shape is substantially S-shaped. Then, the electrode tab 4a
The connection portion between the battery and the current collector 7a is located in the sealing portion 2a as in the case of the plate battery shown in FIGS. Although not shown, the other electrode tab 4b of the plate battery shown in FIG.
Also has the same structure as the electrode tab 4a.

Since such a meandering portion 15a is formed, the sealing portion 2a is formed more than when a linear electrode tab is used.
, The length of the electrode tab 2a located at the position can be increased. For this reason, the area where the side surfaces 18a and 18b of the electrode tab 4a contact the laminated films 6a and 6b in the sealing portion 2a can be increased. Here, if the laminated films 6a, 6b and the side surfaces 18a, 18b of the electrode tab 4a are in close contact with each other on the side surfaces 18a, 18b of the electrode tab 4a, and at least one contact region where no gap is formed can be formed, the plate-shaped battery It is possible to prevent the problem that the electrolytic solution or the like constituting the power generating element leaks out of the plate-shaped battery 1 through the gap formed along the side surfaces 18a and 18b of the electrode tab 4a. If the area where the side surfaces 18a, 18b of the electrode tabs 4a are in contact with the laminate films 6a, 6b can be increased in this manner, the area where the above-mentioned contact area can be formed can be increased. Become. For this reason, the probability that the contact region is formed can be increased, and as a result, the risk of the above-described problem of leakage of the electrolyte solution can be reduced.

Note that, even if a surface layer made of a conductor is formed on the surface of the electrode tab 4a in the plate batteries shown in the fourth and second embodiments, the same as in the plate battery shown in FIG. The effect of can be obtained.

The plane shape of the meandering portion 15a is shown in FIG.
In addition to the S-shape as shown in the above, it may be a curved shape or a meandering shape including a straight portion and a bent portion.

Further, when the plate-shaped battery shown in the first to fourth embodiments of the present invention is applied to a portable radio terminal such as a portable telephone, when the attaching / detaching operation of the plate-shaped battery according to the present invention is repeated a plurality of times, An electrode tab 4a as an external electrode of the plate-shaped battery,
Problems such as breakage or cutting of the portion 4b can be prevented. For this reason, a portable wireless terminal that does not cause trouble in the battery even after long-term use can be realized.

Further, in the plate battery according to the present invention, the sealing reinforcing members 5a and 5b as sealing reinforcing means for preventing leakage of electrolyte and the like from the power generating element and the electrode tab 4a as shown in FIG. Since the meandering portion 15a is formed, it is possible to prevent the electrolyte or the like from leaking to the outside of the plate-shaped battery. For this reason, it is possible to prevent a problem such as a failure of the portable wireless terminal due to the electrolyte or the like leaked from these plate batteries.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the embodiments described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0080]

As described above, according to the present invention, the plate-shaped battery has an electrode terminal member having a thickness larger than the thickness of the current collector, and the electrolytic solution and the like constituting the power generating element are located at the electrode terminal member. In addition, in the plate-shaped battery, the mechanical strength of the electrode portion acting as the external connection terminal is improved, and at the same time, the leakage of the electrolytic solution is prevented. Problem can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing Embodiment 1 of a plate battery according to the present invention.

FIG. 2 is a schematic partial sectional view of the plate-shaped battery shown in FIG.

FIG. 3 is a schematic partial plan view of the plate battery shown in FIG.

FIG. 4 is a schematic partial side view of the plate-shaped battery shown in FIG.

FIG. 5 is a schematic partial sectional view showing a modification of the first embodiment of the plate-shaped battery according to the present invention.

FIG. 6 is a schematic partial perspective view showing Embodiment 2 of the plate battery according to the present invention.

7 is a schematic partial cross-sectional view of the plate-shaped battery shown in FIG.

FIG. 8 is a schematic partial sectional view showing Embodiment 3 of a plate-shaped battery according to the present invention.

FIG. 9 is a schematic partial cross-sectional view showing a modified example of Embodiment 3 of the plate battery according to the present invention.

FIG. 10 is a schematic partial plan view showing Embodiment 4 of a plate battery according to the present invention.

FIG. 11 is a schematic perspective view showing a conventional plate battery.

[Explanation of symbols]

1 plate-shaped battery, 2a, 2b sealing portion, 3 cell portion, 4
a, 4b electrode tab, 5a, 5b sealing reinforcing member, 6,
6a, 6b laminated film, 7a current collector, 8
Welded part, 9 core material, 10, 14a surface layer, 11a, 1
1b Upper surface, 12a, 12b cutout, 13a opening, 15a meandering, 16a, 16b end, 17 end region of sealing portion, 18a, 18b side surface of electrode tab.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroaki Urushiba 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5H011 AA01 AA04 AA17 CC02 CC06 CC10 CC12 DD13 EE04 FF04 GG01 HH02 JJ07 JJ12 KK01 5H022 BB11 BB22 CC05 CC08 CC19 EE03 KK03

Claims (12)

[Claims] A power generation element including a current collector; an electrode terminal member connected to the current collector and having a thickness greater than a thickness of the current collector; and a cell unit holding the power generation element therein; An exterior member including a sealing portion in which the power generation element is sealed in the cell portion and at least a part of the electrode terminal member is located; A plate-shaped battery comprising: a sealing reinforcing means for reinforcing a stopper. 2. The plate-shaped battery according to claim 1, wherein said sealing reinforcing means includes a sleeve member arranged so as to surround said electrode terminal member located at said sealing portion. 3. The sleeve member is arranged so as to surround a connection between the current collector and the electrode terminal member.
The plate-shaped battery according to claim 2. 4. The plate-shaped battery according to claim 1, wherein the sealing reinforcing means includes forming the electrode terminal member located at the sealing portion into a bent shape. 5. The device according to claim 1, wherein a connection portion between the electrode terminal member and the current collector is located at the sealing portion.
A plate-shaped battery according to the item. 6. A power generating element including a current collector, an electrode terminal member connected to the current collector and having a thickness greater than a thickness of the current collector, and a cell unit holding the power generating element therein; A plate-shaped battery comprising: an exterior member that hermetically seals the power generation element in the cell portion and includes a sealing portion where a connection portion between the electrode terminal member and the current collector is located. 7. The plate battery according to claim 1, wherein a conductive layer is formed on a surface of the electrode terminal member. 8. The plate-shaped battery according to claim 7, wherein the surface layer is a layer formed by plating. 9. The plate-shaped battery according to claim 1, wherein said electrode terminal member includes iron or stainless steel. 10. The battery according to claim 1, wherein the electrode terminal member is embedded in a sealing portion of the exterior member. 11. The plate battery according to claim 10, wherein an opening for exposing a surface of the electrode terminal member is formed in a sealing portion of the exterior member. 12. A portable wireless terminal comprising the plate-shaped battery according to any one of claims 1 to 11.