JP2000048781A - Flat, thin battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase energy density of a battery and increase the strength of a peripheral part by housing a battery member containing a positive electrode and a negative electrode with a wrapping material, sealing the peripheral parts of the wrapping material by fusion bonding or adhesion, and folding or winding at least the peripheral parts for leading-out terminals. SOLUTION: A battery member formed by stacking a positive electrode, a separator, and a negative electrode is housed with a sheet-like wrapping material 1, and peripheral parts 6 of the wrapping material are sealed by fusion bonding or adhesion. By folding treatment 7 of the sealed peripheral parts 6, moisture penetration from the sealing part of the periphery parts 6 into the inside is prevented, and the area of the peripheral parts 6 is substantially decreased. Or the peripheral parts 6 are wound in a flat shape instead of folding. At least one terminal led-out of the peripheral parts 6 is folded in the direction of the peripheral parts 6, and the terminal is bonded to the peripheral parts 6 by adhesion or fusion bonding. At least a cut-out part of the corner of the peripheral parts 6 is rounded, and the peripheral parts 6 are folded or wounded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat and thin battery in which a power generation element is housed in an outer packaging material made of a non-gas permeable film member, and its peripheral portion is hermetically sealed by heat sealing or the like.

[0002]

2. Description of the Related Art In recent years, as various electronic devices have become portable, various new batteries have been desired as power sources. As a result, nickel-metal hydride batteries and lithium batteries have been newly developed. However, there is a strong demand not only for the practical use of a new battery system, but also for an improvement in the shape of a new battery having excellent usability and functionality. In a conventional battery, particularly a battery using a metal case, a cylindrical shape was a standard shape. This is because a hermetic opening is possible and the productivity is excellent. In recent years, rectangular batteries having an external shape of a rectangular parallelepiped shape or a rectangular parallelepiped shape in which each part is rounded have been put to practical use in order to enhance the space efficiency when housed in an electronic device. However, this battery shape has a problem that although the hermetic opening is easy, the productivity is extremely low and the battery cost is high. Also, it was technically very difficult to obtain a container which was thinned to some extent or less. Further, since the container used for these small secondary batteries is formed of a metal container also serving as the negative electrode terminal, it is inevitable that the material cost and the manufacturing cost are increased. So, at low cost,
As a means of providing a thinner small battery, instead of a hard case, the power generation element is housed in a bag-shaped outer wrapping material made of a soft film member that has a non-gas permeable laminated polyethylene sheet or aluminum sheet, Are sealed by heat sealing or the like. As such a battery, as disclosed in Japanese Utility Model Laid-Open No. 60-162362, a flat electrode group is sealed from the inside with a heat-sensitive adhesive layer, a laminate film made of aluminum foil and a polymer film, Japanese Patent Application Laid-Open No. 61-206157 discloses a method in which a metal vapor-deposited film serving as a lead body is formed on a heat-sensitive layer of a laminate film, and one end of the metal vapor-deposited film is brought into contact with an electrode rod to seal a power generation element with the laminate film. As disclosed in Japanese Patent Application Laid-Open No. H11-260, there is a method in which a flat electrode group is inserted into a tubular laminated film member, and both ends are heat-sealed and hermetically sealed.

[0003]

However, almost no consideration has been given to what type of terminal connection with electronic equipment, which is one of the biggest problems in flat and thin batteries, so far. No, simply heat-fusing the terminals to the periphery and connecting them to the outside are connected to an external circuit, or an opening is provided in the outer packaging material, and the positive and negative terminals are heat-sealed in this opening It was just used. Further, gas permeability is a problem in a nonaqueous electrolyte flat thin battery using an envelope material. The fusion layer made of a polymer material has a very small amount of gas permeability even when completely sealed. In particular, moisture acts on the negative electrode made of lithium or a lithium compound, causing performance degradation. Japanese Patent Application Laid-Open No. 62-61268 and Japanese Patent Application Laid-Open
In JP-A-383101, a terminal made of a conductive material electrically connected to a current collector is sandwiched between peripheral portions of outer wrapping materials, and when the peripheral portion is sealed by heat fusion, leakage from a lead sealing portion occurs. To prevent this, a heat sealing film is separately provided on the heat seal portion of the lead surface. However, these are only contrivances for the terminal lead-out part,
In addition, it is apparent that processing on the lead portion is required, resulting in an increase in cost and a decrease in tact efficiency. In addition, it is known that increasing the width of the thermal fusion at the peripheral portion reduces the ingress of moisture,
When a seal width of 0 mm or 15 mm, which is also used for retort foods, is used, the area in a portion different from the battery element becomes large, and the energy density of the battery becomes small. Another problem with flat and thin batteries is that the outer packaging material has no rigidity and is very weak against loads such as bending.
It is a rule that consumers do not directly insert and remove batteries because of the danger of accidents such as short circuits and ruptures caused by short circuits. The present invention has been made in view of the above background, and solves the problems of the prior art, sufficiently suppresses the ingress of moisture from the peripheral portion into the inside of the outer packaging material, and thereby, the area occupied by the sealing portion, the seal, It is an object of the present invention to provide a highly reliable flat thin battery in which the width is made as small as possible to increase the energy density of the battery, and further, the strength of the peripheral portion and the bending strength of the battery are increased.

[0004]

According to the present invention, first, a battery member including a positive electrode and a negative electrode is housed by using an envelope, and a peripheral portion between the envelopes is heat-sealed. Alternatively, there is provided a flat thin battery, wherein at least a peripheral portion from which a terminal is led out has a bent shape in a flat thin battery sealed by bonding. Second, at least a terminal is derived from a flat thin battery in which a battery member including a positive electrode and a negative electrode is housed using an envelope material and the peripheral portions of the envelope materials are sealed by heat fusion or adhesion. A flat thin battery is provided, wherein the peripheral portion has a wound-up shape. Third, the battery member including the positive electrode and the negative electrode is housed by using the envelope material, and a part of the positive and negative electrode current collectors of the battery member is extended or electrically connected to the current collector. In a flat thin battery in which a terminal made of a connected conductive material is sandwiched between peripheral portions of outer wrapping materials and the peripheral portion is sealed by heat sealing or bonding, at least one terminal derived from the peripheral portion is connected to the peripheral portion. A flat thin battery characterized in that the battery is bent in the direction and is adhered or thermally fused to the peripheral portion. Fourthly, there is provided a flat thin battery according to the third aspect, wherein the peripheral portion is heat-sealed or bonded so that a surface on which the terminal is bent is on the outside. Fifth, in the flat thin battery described in the first, second, third or fourth,
A flat thin battery is provided, wherein a notch is provided in advance in at least one of the peripheral corners.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 14 is a perspective view of a main part of a flat thin battery housed in an envelope material which is a premise of the present invention. This flat thin battery uses a sheet-shaped envelope material 1 for a positive electrode 2 and a separator 3. The battery member 5 in which the negative electrodes 4 are stacked is housed, and the peripheral portions 6 of the outer wrapping material are sealed by heat fusion or adhesion. Reference numerals 9 and 10 are positive and negative electrode current collectors of the battery member 5. For example, the outer wrapping material 1 may be formed by stacking two sheet-like wrapping materials to seal the peripheral portions 6 together, or by wrapping one outer wrapping material in two.
The peripheral part may be sealed by folding it. Further, the outer packaging material may be configured in a bag shape in advance. The present inventors have studied the above-mentioned problem, and in the flat thin battery shown in FIG. 14, by folding the peripheral portion 6, which is overlapped and sealed as shown in FIG. 1, from the sealing portion of the peripheral portion 6. It has been found that almost no water enters the inside of the battery, the area of the peripheral portion can be significantly reduced, and the energy density of the battery can be increased. Further, the flat thin battery which is easily bent and easily damaged by the battery element 5 has a shape in which the peripheral portion 6 is bent as in the present invention, thereby increasing the strength against external force in the bending direction and having high reliability. A flat thin battery was obtained. Note that the present invention is not limited to the terminal having a terminal in which the terminal is derived from the peripheral portion as shown in FIG. 14, and various types of terminal can be applied. In short, in the present embodiment, the peripheral portion 6 having a large sealing area by being sealed by heat sealing or the like is bent at least once or more.
It is characteristic that the area of the sealed portion is reduced and the watertightness is enhanced.

FIG. 2 shows another embodiment of the present invention. In FIG. 2, instead of folding the peripheral portion 6, the peripheral portion 6 is wound up into a flat roll shape 8 so that the ingress of moisture from the sealing portion is almost eliminated. The area of the peripheral portion 6 (projection width of the seal portion) could be significantly reduced. Furthermore, flat and thin batteries that are easy to bend and are easily damaged by battery elements,
By winding around the periphery as in the present invention,
A highly reliable flat thin battery with increased strength against bending was obtained. Also in this case, the form of the terminal is not limited to the form in which the terminal is derived from the peripheral portion as shown in FIG. Next, in a nonaqueous electrolyte flat thin battery using an envelope material, gas permeability becomes a problem. That is, the fusion layer made of a polymer material has a very small amount of gas permeability even when completely sealed, and the amount of gas permeation increases in proportion to the length of the outer periphery of the fusion surface. It becomes smaller in proportion to the wearing width. In particular, moisture and oxygen exert an effect on the negative electrode made of lithium or a lithium compound, causing deterioration of performance. The present inventors have studied and studied this problem, and as a result, the battery members including the positive electrode and the negative electrode are housed using the envelope material, and the peripheral parts between the envelope materials are sealed by heat fusion or adhesion. In the thin battery, the width of at least one side of the peripheral portion 6 (the width of the sealing surface) is 5 mm or more,
It has been found that by setting the thickness to preferably 7 mm or more, more preferably 10 mm or more, almost no moisture enters from the fusion bonded portion. In addition, since the peripheral portion 6 has a bent or crimped shape, the value of moisture penetration becomes smaller than that of a normal planar shape. This results in a part (bent part, curved part) in which the thickness of the fusion or adhesive layer is reduced by the processing to be bent or crimped,
This is considered to be because the cross-sectional area affecting moisture intrusion can be reduced.

Further, the present inventors have studied the treatment of the terminal portion. As a result, as shown in FIG. 14, the battery member 5 including the positive electrode and the negative electrode is housed by using the outer wrapping material 6, and the positive and negative electrode collection of the battery member is performed. A terminal 11, which is formed by extending a part of the current collectors 9, 10 or made of a conductive material electrically connected to the current collector;
12 is sandwiched between the peripheral portions 6 of the outer wrapping materials, and at least one terminal derived from the peripheral portion is connected to the peripheral portion as shown in FIG. The terminal is bent in the direction (approximately 180 degrees in the direction of the battery main body), and this terminal is bonded or thermally fused to the peripheral portion 6, so that it is not necessary to provide an extra space for connecting the terminal when the electronic device is mounted. A flat thin battery with almost no damage due to attachment and detachment was obtained by improving the strength of the terminal portion. As the envelope 1 of the battery, for example, as shown in FIG.
In general, a multilayer film including a metal layer and a resin layer (heat sealing layer) 13 for heat sealing on the inner surface of the metal foil is used. In particular, when a system using a non-aqueous electrolyte known as a system having high output, high density, long-term stability, and good storage stability as a reaction element is used, the heat-sealable resin 13 on the inner surface of the envelope material is chemically A stable and inert polyolefin resin or an ionomer resin is used. In the present invention, it is desirable that the protective layer 15 also has a heat fusibility.

The present inventors have studied to obtain a terminal part having high strength and reliability, and as a result, as shown in FIG.
Is bent over the peripheral portion 6, and the peripheral portion 6 is bent so that the bent surface faces outward, thereby forming a peripheral portion 16 which is heat-sealed or adhered. It can be used as a plug-in terminal for equipment. This makes it possible to easily handle a flat thin battery, which has not been able to be easily attached to and detached from an electronic device, and almost eliminates troubles during battery replacement. Similarly, as shown in FIG. 6, the peripheral portion 6 is wound and heat-fused or bonded so that the terminals 11 and 12 bent on the peripheral portion 6 face outward, thereby forming the peripheral portion 17. The strength of the part has been greatly increased, and it has become possible to use it as a plug-in terminal for electronic equipment. This makes it possible to easily handle a flat thin battery, which has not been able to be easily attached to and detached from an electronic device, and almost eliminates troubles during battery replacement. In addition, the width of the peripheral fused or bonded portion is reduced, and moisture penetration in a steady state is increased, but the actual battery is subjected to the stress of attachment and detachment, so that the sealing performance is improved under almost the same usage conditions. And water ingress could be reduced at the same time.

Next, FIG. 7 shows, for example, in the case where a bag is formed in advance, three sides are bent in a state where two rectangular envelopes 1 are stacked, and then heat-fused to form a bag. In other words, the present invention relates to corner corner processing before heat fusion in a case where a single envelope is folded in two or the like and then two sides are thermally fused to form a bag. That is, by forming and chamfering the corner portion of the outer wrapping material in which the corner portion (corner corner portion) is formed into a square shape of about 90 degrees in advance and chamfering the corner portion, the strength of the corner portion after bending is reduced. The height is increased to eliminate the problem in the bending process. The necessity and effect of increasing the strength of the corner portion in advance as described above are prominent in, for example, the peripheral portion 6 from which the terminals 11 and 12 are led out as described above. That is, in the case of performing a bending process on two sides that are adjacent to each other with a corner portion interposed therebetween as in the present invention, a difficult process is expected because stress concentrates on the corner portion 18 as shown in FIG. The present inventors have studied this problem, as a result of providing a notch in at least one or more of the peripheral corners in advance, and bending or winding each of two sides adjacent to each other with the notch in between, The bending process can be performed easily,
The tact time has been significantly improved in the production process. At this time, the shape of the notch may be a square, a triangle, a radius, or the like. The present inventors have repeatedly studied the notch, and as a result, the notch provided in the corner of the peripheral portion in advance has a triangular shape 19 as shown in FIG. The ends come into contact with each other without overlapping at the corners, thereby significantly improving the yield of the battery and the reliability of the battery in the storage test. In addition, the strength of the corner portion is increased, and particularly, the attachment / detachment to / from an electronic device can be easily performed, and the reliability of the flat thin battery can be improved. Similarly, as shown in FIG. 9, since the notch 20 provided in advance in at least one of the peripheral corners has an R-shape, the corner 21 after the bending or crimping process has an R-shape, and a special post-processing is performed. This eliminates the need for rounding corners, which greatly contributes to a reduction in tact time.

[0010]

[Example 1]

(Positive electrode) 3 parts by weight of polyvinylidene fluoride are dissolved in 38 parts by weight of N-methylpyrrolidone, 250 parts by weight of LiCoO as an active material, and 9 parts of graphite as a conductive agent.
The respective parts by weight were added and mixed and dispersed with an homogenizer under an inert atmosphere to prepare a coating for a positive electrode. This was applied to both sides of a 20 μm aluminum foil using a wire bar in the air, dried at 125 ° C. for 30 minutes, and then compressed to form a width of 5 μm.
A positive electrode of 0 mm and a length of 100 mm was obtained. The thickness of the mixture after molding was the same on both sides, with a film thickness of 70 μm. (Negative electrode) 2 parts by weight of polyvinylidene fluoride is dissolved in 58 parts by weight of N-methylpyrrolidone, 40 parts by weight of a coke calcined at 2500 ° C. are added, and the mixture is mixed and dispersed under an inert atmosphere by a roll mill method to prepare a negative electrode coating material. Was prepared. This was applied on a 20 μm copper foil in the atmosphere, dried at 100 ° C. for 15 minutes, and then compression-formed to form a width of 50 mm and a length of 100 m.
m of the negative electrode was obtained. The thickness of the mixture after molding is 5 on both sides.
It was the same as 0 μm. Positive electrode 2, bag-shaped separator 3 made of microporous polypropylene film having a thickness of 25 μm
Each electrode of the negative electrode 4 encapsulated in a solution of 86% of an electrolyte solution of 1.0 mol / l LiPF6 dissolved in ethylene carbonate / dimethyl carbonate (1/1: volume ratio), 13.7% of ethoxydiethylene glycol acrylate, and trimethylolpropane The polymer was permeated into a polymerizable solution in which triacrylate 0.3% and benzoin isopropyl ether 0.04% were mixed, and irradiated with a high-pressure mercury lamp to gel. Each of the gelled negative electrode (enclosed in a separator), the positive electrode, and the negative electrode were laminated in the order of four negative electrodes and three positive electrodes. Next, terminals having a width of 4 mm, a length of 30 mm, and a thickness of 100 μm were superimposed on the current collector tabs 9 and 10 of the positive and negative electrodes, and ultrasonic welding was performed to produce a polymer solid electrolyte laminated electrode assembly 5. Here, the terminal material of the positive electrode is aluminum, and the terminal material of the negative electrode is S.
US316. The battery member 5 produced in this way is a 74 × 130 mm size outer packaging material in which a 50 μm heat-fusible resin (ionomer resin) is bonded to both sides of a 10 μm aluminum core material as shown in FIG. 1 for 10m
The battery was inserted into a bag-shaped battery container which was heat-fused on three sides with a width of m. The remaining one side having a width of 10 mm is thermally fused to one side of the unsealed side while the lead is interposed therebetween, thereby forming a 540 mm.
A polymer solid electrolyte flat thin battery of mAh (at the time of 1 / 3C discharge) was obtained.

FIG. 10 shows the results of a 100-cycle charge / discharge test of the 540 mAh battery of which the peripheral portion was not subjected to the bending process and the battery of which the bending process was performed one side at a time. In this test, it was found that the bending process of the peripheral portion clearly reduces the deterioration due to charging and discharging, and has the effect of suppressing the permeation of gas containing water. FIG. 11 shows 540 mAh
10 shows the results of conducting a 100-cycle charge / discharge test on each of the batteries of the present battery of which the peripheral portion was not subjected to the winding-up process and the battery of which the peripheral portion was subjected to the winding-up process one by one. From FIG. 11, it was evident that performing the winding treatment of the peripheral portion clearly reduces deterioration due to charging and discharging, and has an effect of suppressing the permeation of gas containing water. Tables 1 and 2 show the capacities per unit projected area from the top when the peripheral portion processing is not performed and when the bending or the tightening process is performed. In addition, the peripheral numbers 22, 23, 2
4 and 25 are shown. From the table, it can be seen that the capacity density is greatly increased by performing the bending or crimping treatment of the peripheral portion. The table also shows the relationship between the peripheral processing and the battery bending load. In the experiment, the battery was fixed so that the central part in the longitudinal direction was at the end of the pedestal at a right angle, and the end of the non-fixed side of the battery was loaded downward from the top, and the angle was increased to 30 °. The maximum load required to bend is recorded. From the table, it can be seen that the battery strength is greatly increased by performing the bending or crimping treatment of the peripheral portion. In addition, when only the short sides 22 and 23 are bent or tightened, that is, when the long side is bent or not tightened, the result is not shown because it does not correspond to this experiment. FIG. 13 shows 540 mA.
h shows the capacity retention ratio after 100 cycles in the width of the heat-sealed peripheral portion of each length in the present battery. It can be seen from the figure that the larger the width of the peripheral portion, the smaller the capacity deterioration. In particular, the use of a peripheral portion of 10 mm or more significantly reduces the deterioration.

[0012]

[Table 1]

[0013]

[Table 2] [Example 2] A flat thin battery was obtained in the same manner as in Example 1 except that four corners were cut into triangular cutouts and the peripheral portion was bent. As a result, the process was simplified, the tact was improved by 15 points, and the defect rate was improved by 20 points. Example 3 A flat and thin battery was obtained in the same manner as in Example 1 except that the four corners were cut off in a triangular shape to form notches, and the peripheral portion was subjected to a winding process. As a result, the process was simplified, the tact was improved by 15 points, and the defect rate was improved by 20 points. Example 4 A flat thin battery was obtained in the same manner as in Example 1 except that four corners were provided with cutouts having a round shape as shown in FIG. 9 and the peripheral portion was bent.
As a result, the process is simplified, the tact is 15 points,
The defect rate has improved by 20 points. In addition, since the corners of the completed flat thin battery are rounded, handling becomes easy, and the battery can be securely inserted. Example 5 A flat thin battery was obtained in the same manner as in Example 1 except that the four corners were provided with rounded notches as shown in FIG.
As a result, the process is simplified, the tact is 15 points,
The defect rate has improved by 20 points. In addition, since the corners of the completed flat thin battery are rounded, handling becomes easy, and the battery can be securely inserted.

[0014]

As described above, the flat and thin battery according to the first aspect of the present invention accommodates a battery member including a positive electrode, a separator, and a negative electrode by using an outer wrapping material, and heats the peripheral portion between the outer wrapping materials. In a flat thin battery sealed by attachment or adhesion, at least a peripheral portion from which a terminal is drawn out has a bent shape, whereby almost no water enters from a sealing portion and the area of the peripheral portion is significantly reduced. Can be. Furthermore, a flat thin battery that is easily bent and easily damaged by battery elements can be a highly reliable flat thin battery with increased strength against bending. In addition, as the outer wrapping material, not only a sheet-like material formed in a bag shape in advance, but also a battery member stored inside by stacking a plurality of outer wrapping materials and fusing the peripheral portion thereof. Is included. The flat thin battery according to claim 2 has a configuration in which at least a peripheral portion from which the terminal is led is formed into a crimped shape, whereby almost no water enters from the sealing portion, and the area of the peripheral portion can be significantly reduced. it can.
Furthermore, a thin flat battery that is easily bent and easily damaged by the battery element can be a highly reliable flat thin battery with increased strength against bending. Claim 3
The flat thin battery of the above, using the outer wrapping material, house the battery member including the positive electrode, the negative electrode, or extend a part of the positive and negative electrode current collector of the battery member, or, with these current collectors In a flat thin battery in which a terminal made of an electrically connected electrically conductive material is sandwiched between peripheral portions of outer wrapping materials and the peripheral portion is sealed by heat sealing or bonding, the terminal is drawn out from the peripheral portion as shown in FIG. Also, by bending at least one terminal in the peripheral direction and bonding or heat-sealing the peripheral portion, it is not necessary to provide an extra space for connecting the terminal when mounting the electronic device, and the strength of the terminal portion is reduced. It is possible to obtain a flat and thin battery that is hardly damaged by rising and detaching. According to a fourth aspect of the present invention, there is provided the flat thin battery wherein the peripheral portion is bent so that the surface on which the terminal is bent is on the outside, and the peripheral portion is heat-sealed or adhered. It can be used as a plug-in terminal to electronic equipment. Further, the handling of a flat thin battery, which could not be easily attached to and detached from an electronic device, can be easily performed, and trouble at the time of battery replacement can be almost eliminated. The flat thin battery according to claim 5, wherein at least one of the peripheral corners of the outer packaging material having a corner of about 90 degrees.
By forming a notch on one end and chamfering and bending or winding each side adjacent to each other with the notch in between, it is possible to easily perform a bending process, thereby significantly improving tact in a production process. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a shape of a peripheral portion of an outer packaging material in which a flat thin battery according to the present invention is stored.

FIG. 2 is a perspective view showing another shape of a peripheral portion of an outer packaging material in which the flat thin battery according to the present invention is stored.

FIG. 3 is a perspective view showing a method of processing a terminal led out from a peripheral portion of an outer packaging material accommodating a flat thin battery according to the present invention.

FIG. 4 is a cross-sectional view of an outer packaging material made of a multilayer film.

FIG. 5 is a perspective view showing another method of processing a terminal derived from a peripheral portion of an outer packaging material in which a flat thin battery according to the present invention is stored.

FIG. 6 is a perspective view showing another method of processing a terminal derived from a peripheral portion of an outer packaging material in which the flat thin battery according to the present invention is stored.

FIG. 7 is a perspective view showing a corner where stress is concentrated when adjacent peripheral portions are bent.

FIG. 8 is a plan view showing a method of avoiding the concentration of the stress.

FIG. 9 is a plan view showing another method for avoiding the stress concentration.

FIG. 10 is a diagram showing a relationship between a bending process of a peripheral portion of an envelope material and a capacity retention rate of a battery.

FIG. 11 is a diagram showing a relationship between a winding-fastening process in a peripheral portion of an outer packaging material and a capacity retention rate of a battery.

FIG. 12 is a diagram showing peripheral numbers of the outer packaging material used for the measurements in Tables 1 and 2 above.

FIG. 13 is a diagram showing the relationship between the width of the peripheral portion of the heat fusion and the capacity retention after 100 cycles.

FIG. 14 is a perspective view of a flat thin battery stored in an outer packaging material.

[Explanation of symbols]

1 outer packaging material, 2 positive electrode, 3 separator, 4
Negative electrode, 5 battery member, 6 peripheral portion, 7 bending process, 8 winding process, 9 positive electrode current collector (tab), 10 negative electrode current collector (tab), 11 terminal connected to positive electrode current collector, 12 negative electrode current collector Terminal connected to the conductor, 13 resin layer (thermally fused layer), 14 metal foil, 1
5 Protective layer, 16, 17 Heat-fused or bonded peripheral portion, 18 Corner where stress is concentrated, 19 Triangular cutout, 20 Round cutout, 2
1 Corners after winding, 22, 23, 2
4, 25 Number of perimeter of bent, 26 Corner part after bending, 27 Peripheral part after bending, 2
8 Peripheral parts after winding

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Kabata 1-3-6 Nakamagome, Ota-ku, Tokyo F-term in Ricoh Co., Ltd. 5H011 AA01 AA06 AA09 AA10 CC02 CC06 CC10 DD07 DD13 DD14 EE04 FF02 GG08 GG09 HH02 JJ12 JJ25 JJ27 5H029 AJ04 AJ11 AJ14 AK03 AL06 AM01 AM02 AM03 AM04 AM05 AM07 AM11 AM16 BJ04 BJ12 CJ03 CJ04 CJ05 DJ02 DJ03 DJ04 DJ05 EJ01 EJ12 HJ12

Claims (5)

[Claims] 1. A flat thin battery in which a battery member including a positive electrode and a negative electrode is housed by using an envelope material, and peripheral portions of the envelope materials are sealed by heat fusion or adhesion, and at least terminals are led out. A flat thin battery having a bent peripheral portion. 2. A flat thin battery in which a battery member including a positive electrode and a negative electrode is housed by using an envelope material and the peripheral portions of the envelope materials are sealed by heat fusion or adhesion. A flat thin battery, wherein a peripheral portion of the battery has a wound shape. 3. A battery member including a positive electrode and a negative electrode is housed by using an outer wrapping material, and a part of the positive and negative electrode current collectors of the battery member is extended, or the current collector and the current collector are electrically connected to each other. In a flat thin battery in which a terminal made of a conductive material connected to an outer package is sandwiched between peripheral portions of the outer wrapping material and the peripheral portion is sealed by heat fusion or adhesion, at least one terminal derived from the peripheral portion is surrounded by a peripheral portion. A flat thin battery characterized in that it is bent in the direction of its part and adhered or thermally fused to the peripheral part. 4. The flat thin battery according to claim 3, wherein
A flat thin battery, wherein the peripheral portion is heat-sealed or bonded so that a surface on which the terminal is bent is on the outside. 5. The flat thin battery according to claim 1, wherein a notch is provided in advance in at least one of peripheral corners.