JP2006269288A - Thin battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin battery which is effective in forming a seal thicker than a battery body and excellent in heat resistance and pressure resistance for preventing an electrode frame member and a negative electrode frame member from breaking widely. <P>SOLUTION: A lithium primary battery 1A comprises a battery body 14, in an active material filling room 10 of which a separator 9, an anode active substance layer 4, and a cathode active substance layer 5 are housed, and a seal 11 in a shape of a frame, which keeps the active material filling chamber 10 hermetic by sealing the periphery of the battery body 14. The seal 11 is thicker than the battery body 14 in a section parallel to the thickness direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thin battery.

Recently, the demand for IC cards with built-in microcomputers is increasing as a simple storage medium replacing magnetic cards. The mainstream power supply method used in IC cards is the electromagnetic induction method, but IC cards that do not have an internal power supply and function only by electromotive force by electromagnetic induction can only know the stored information from the terminal device. There is inconvenience that cannot be done. Therefore, there is an attempt to provide an internal power supply for such an IC card. As a battery incorporated in an IC card, a thin and flexible battery as described in Patent Documents 1 and 2 is suitable.
Japanese Patent No. 2935427 JP-A-8-055627

  In general, as shown in FIG. 10, an IC card is formed by stacking a core sheet 72 on an inner sheet 73 on which electrical components such as an IC and a battery 71 are mounted, and sandwiching the sheet group from above and below by oversheets 74 and 75. Manufactured by thermocompression bonding. In this thermocompression bonding process, there is a problem that heat and pressure are applied to the battery 71 to cause seal breakage. The core sheet 72 penetrates a cavity 72 a for fitting the battery 71, but is insufficient to prevent the pressure of the press from reaching the battery 71. Further, since the IC card is required to have flatness on the surface, it is technically difficult to press the battery card away from the battery 71.

  In view of the above problems, an object of the present invention is to provide a thin battery excellent in heat and pressure resistance.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above problems, a thin battery of the present invention includes a separator, a positive electrode active material layer disposed on one surface side of the separator, a negative electrode active material layer disposed on the other surface side of the separator, and a separator. A battery main body portion in which the positive electrode active material layer and the negative electrode active material layer are accommodated in the active material filling chamber, and a frame-shaped seal portion that seals the periphery of the battery main body portion to keep the active material filling chamber airtight. The main feature is that the thickness of the seal portion is adjusted to be equal to or greater than the thickness of the battery body in a cross section parallel to the vertical direction.

  In addition, the present invention viewed from another viewpoint is characterized in that the battery body and the seal are configured so that the battery body is concave.

  According to the thin battery of the present invention, the pressure from the pressing machine can be received by the seal portion in the thermocompression bonding process at the time of manufacturing the IC card. Since the pressure applied to the battery body is reduced, the internal pressure of the active material filling chamber does not increase excessively. That is, it is possible to realize a thin battery having improved pressure resistance and less likely to cause seal breakage.

  More preferably, at least one of the two main surfaces of the battery main body portion is a concave surface, and the thickness of the seal portion is larger than the thickness of the battery main body portion. If it does in this way, it can suppress reliably that a pressure concentrates on a battery main-body part. However, there is no doubt that a lithium primary battery having a flat surface in which the thickness of the battery body and the thickness of the seal portion are equal is also suitable.

  Moreover, it is desirable that the melting point of the resin having the heat-fusibility constituting the seal portion is 110 ° C. or higher and 200 ° C. or lower. According to such a configuration, since the seal portion is not easily softened and deformed by heating at the time of manufacturing the IC card, the pressure from the press can be reliably received by the seal portion.

  In one preferable aspect, the seal part is made of a frame member as a seal material made of a resin having heat-fusibility and a material having a melting point higher than that of the frame member, and increases the thickness of the seal part. It can comprise as a thing containing a spacer. If the thickness of the seal portion is increased in this manner, the main surface of the battery main body portion can be made concave.

  In one preferred embodiment, the thin battery according to the present invention includes a positive electrode active material layer that holds a positive electrode active material layer between a separator, a positive electrode active material layer, a resin frame member that surrounds the negative electrode active material layer, and the separator. And a negative electrode current collector that holds the negative electrode active material layer between the electric current separator and the separator. An active material filling chamber is formed between the positive electrode current collector and the negative electrode current collector, and the positive electrode current collector and the negative electrode current collector are accommodated by accommodating the separator, the positive electrode active material layer, and the negative electrode active material layer in the active material filling chamber. A battery main body using an electric body as an exterior material is configured. The frame member is composed of a positive electrode side frame member and a negative electrode side frame member bonded to each other. The outer peripheral part of the positive electrode current collector is fixed to the positive electrode side frame member, and the outer peripheral part of the negative electrode current collector is fixed to the negative electrode side frame member, so that the positive electrode current collector and the negative electrode current collector are placed above and below the frame member. The arranged seal portion is configured. The thickness of the positive electrode side frame member is different from the thickness of the negative electrode side frame member.

  In order to make the thickness of the seal part larger than the thickness of the battery body part, the thickness of the frame member constituting the seal part is set to be larger than the total thickness of the separator, the positive electrode active material layer, and the negative electrode active material layer. A configuration to enlarge is conceivable. The present invention is characterized in that one of the positive electrode side frame member and the negative electrode side frame member is positively thickened instead of thickening the frame member as a whole. Thus, by making one of the positive electrode side frame member and the negative electrode side frame member thin and the other thick, the energy of the heat welding jig (or ultrasonic welding jig) is easily transmitted to the vicinity of the boundary between the two. Therefore, when the two are bonded to form a seal portion, the vicinity of the boundary between the two can be quickly melted and solidified, and as a result, the positive frame member and the negative frame member can be prevented from being largely crushed. . Therefore, the present invention is effective as a configuration for making the thickness of the seal portion larger than the thickness of the battery body portion.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of a lithium primary battery which is an embodiment of a thin battery according to the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. The primary lithium battery 1A is rectangular and plate-shaped as a whole, and includes frame members 2 and 3, a positive electrode active material layer 4, a positive electrode current collector 6, a negative electrode active material layer 5, a negative electrode current collector 7, and a separator 9. The positive electrode current collector 6 and the negative electrode current collector 7 are fixed to the frame members 2 and 3 so as to close the openings of the frame members 2 and 3, respectively, and also serve as an exterior material of the lithium primary battery 1A. Further, the positive electrode current collector 6 and the negative electrode current collector 7 have power extraction portions 6t and 7t, respectively. The power extraction portions 6t and 7t extend outward from the frame members 2 and 3 in a plane orthogonal to the thickness direction of the lithium primary battery 1A.

  As shown in FIG. 2, the frame members 2 and 3 include a positive electrode frame member 2 and a negative electrode side frame member 3. The positive electrode side frame member 2 and the negative electrode side frame member 3 are bonded to each other on the facing surfaces. An active material filling chamber 10 is formed by the frame members 2 and 3, the positive electrode current collector 6 and the negative electrode current collector 7, and the separator 9, the positive electrode active material layer 4 and the negative electrode active material layer 5 are accommodated in the active material filling chamber 10. As a result, the battery body 14 is formed. Further, the positive electrode current collector 6 is bonded to the positive electrode side frame member 2 and the negative electrode current collector 7 is bonded to the negative electrode side frame member 3 so as to be located on the side opposite to the separator 9. Thereby, the seal part 11 which maintains the airtightness of the active material filling chamber 10 is formed. By fixing the peripheral edge portion 9k of the separator 9 to the negative electrode side frame member 3, the active material filling chamber 10 is divided into a positive electrode side where the positive electrode active material layer 4 is arranged and a negative electrode side where the negative electrode active material layer 5 is arranged. It is divided. In the active material filling chamber 10, the positive electrode active material layer 4 is held between the positive electrode current collector 6 and the separator 9, and the negative electrode active material layer 5 is held between the negative electrode current collector 7 and the separator 9. Yes.

  The battery body 14 has an atmosphere in which the inside of the active material filling chamber 10 is depressurized from atmospheric pressure, and the main surface 6p on the positive electrode side is concave. On the other hand, the two main surfaces 6g and 7g of the seal part 11 are substantially flat. The main surface 7p on the negative electrode side of the battery body 14 is also substantially flat. That is, the battery body 14 and the seal 11 are configured so that the battery body 14 is concave. Specifically, as shown in the schematic diagram of FIG. 3, when the lithium primary battery 1A has a cross section parallel to the thickness direction, the thickness of the seal portion 11 is D1, and the thickness of the battery main body portion 14 is D2. The relationship of D1 ≧ D2 is satisfied (preferably D1> D2). According to such a structure, as shown in FIG. 4, when the primary lithium battery 1 </ b> A is accommodated between the sheet groups 77 and 78 that are components of the IC card and pressed by the press machines 80 and 81, the seal portion Since 11 becomes a support, it can suppress that a pressure concentrates on the battery main-body part 14. FIG. Therefore, seal breakage is unlikely to occur.

Next, individual components will be described.
The frame members 2 and 3 are thin resin sheets having a shape like a window frame, and are made of a thermoplastic resin having a heat-sealing property so as to have a function as a sealing material. Most of the material of the card-type simple storage medium such as an IC card is vinyl chloride, and the temperature applied at the time of card production is relatively high at 110 ° C. to 140 ° C. Therefore, it is important that the resin used for the frame members 2 and 3 has a higher melting point. However, if the melting point is simply high, adhesion to the current collectors 6 and 7 becomes a problem, and if the melting point is high, there is a possibility that the electrolyte solution or the like may be affected by heat in the sealing process during battery manufacture. Therefore, it is desirable that the resin used for the frame members 2 and 3 has a melting point of 110 ° C. or higher and 200 ° C. or lower (preferably 140 ° C. or higher and 200 ° C. or lower). For example, acid-modified polypropylene (melting point: about 160 ° C.) is preferable because it satisfies these conditions. In addition, as the frame members 2 and 3, a plurality of resin adhesive layers made of acid-modified polypropylene (PP-a) are provided on both sides or one side of a base material made of a thermoplastic resin such as polypropylene or polyethylene terephthalate. A resin sheet having a layer structure can also be used.

  As shown in FIG. 2, the total thickness of the positive electrode side frame member 2 and the negative electrode side frame member 3 is larger than the total thickness of the positive electrode active material layer 4, the separator 9 and the negative electrode active material layer 5. Thereby, the main surface of the battery main body part 14 can be made into a concave surface instead of the structure which the positive electrode side protruded in plateau shape. The thickness of the positive electrode side frame member 2 and the thickness of the negative electrode side frame member 3 can be made equal. Further, in the case of an IC card application of ISO standard (ISO / IEC 7810), the thickness of the lithium primary battery 1A can be, for example, 200 μm or more and 500 μm or less in the seal portion 11. The “main surface” is a surface having the largest area.

The positive electrode active material layer 4 includes, for example, 60% by mass or more and 70% by mass or less of a positive electrode active material, 1% by mass or more and 5% by mass or less of a conductive auxiliary agent, and 25% by mass or more and 35% by mass or less of an electrolytic solution. It consists of a positive electrode composite. As the positive electrode active material, a transition metal oxide powder that forms a composite oxide with lithium such as MnO ₂ can be used. A carbon material such as acetylene black can be used for the conductive assistant. As the electrolytic solution, a lithium salt dissolved in an organic solvent such as dimethoxyethane (DME), ethylene carbonate (EC), or propylene carbonate (PC) can be used.

  The negative electrode active material layer 5 is composed of a lithium foil. It is also possible to use lithium alloy foil (for example, lithium-aluminum alloy) instead of lithium foil. When the lithium primary battery 1A is designed for an ISO standard IC card, the thickness of the lithium foil that is the negative electrode active material layer 5 can be adjusted to, for example, 30 μm or more and 150 μm or less. The masses of the positive electrode active material layer 4 and the negative electrode active material layer 5 are adjusted such that the battery capacity of the positive electrode is larger than the battery capacity of the negative electrode. This prevents the lithium foil forming the negative electrode active material layer 5 from remaining after complete discharge.

  As the material for the current collectors 6 and 7 and the lead terminals 6t and 7t, one kind selected from a highly conductive metal group consisting of copper, copper alloy, stainless steel, aluminum, aluminum alloy, nickel and nickel alloy is preferably used. Can be used. In particular, stainless steel is preferable because it is excellent in workability, corrosion resistance, and economy. In order to obtain long-term stability, it is important that the constituent material of the current collector does not elute into the battery. In this regard, stainless steel has a minute. Specifically, SUS301, SUS304, SUS316, SUS316L, which are typical as austenitic stainless steel, and SUS631, which is typical as precipitation hardened stainless steel, are also excellent in spring properties, and therefore their use is recommended.

  The separator 9 is a thin film that separates the positive electrode and the negative electrode and sufficiently penetrates the electrolyte, and has a porous and multilayer structure. Specifically, a nonwoven fabric made of a resin such as polyethylene or polypropylene can be used. In the present embodiment, a polyethylene porous sheet is used for the separator 9. Moreover, the thickness of the separator 9 can be 10 micrometers or more and 60 micrometers or less, for example.

Next, a manufacturing method of the lithium primary battery 1A will be described.
FIG. 6 is an explanatory diagram of the manufacturing process of the lithium primary battery 1A. First, the negative electrode current collector 7 formed in an appropriate size is disposed at a position where one opening of the frame member 3 is closed, and the negative electrode side frame member 3 is melted and solidified by ultrasonic waves or heating, so that the negative electrode current collector is obtained. 7 is fixed to the negative electrode side frame member 3 (6-1). Thus, the case 13 in which the negative electrode side frame member 3 and the negative electrode current collector 7 are assembled is obtained. Next, the lithium foil 5 as the negative electrode active material is accommodated in the case 13. Further, the separator 9 is placed on the negative electrode side frame member 3 so as to cover the lithium foil 5. The separator 9 is aligned and bonded to the negative electrode side frame member 3 so that the peripheral edge 9k is hooked on the inner peripheral part of the negative electrode side frame member 3 (6-2).

  Next, the positive electrode mixture previously formed into a film shape is disposed on the separator 9 to form the positive electrode active material layer 4 (6-3). The necessary electrolyte may be impregnated before the positive electrode current collector 6 is disposed. Of course, a paste-like positive electrode mixture can be printed instead of the film-like positive electrode mixture. After forming the positive electrode active material layer 4, the positive electrode side case 12 prepared in advance is put on the positive electrode active material layer 4 (6-4). The case 12 is a component in which the positive electrode current collector 6 is assembled (fixed) to the positive electrode side frame member 2. Then, the positive electrode side frame member 2 and the negative electrode side frame member 3 are melted and solidified in a vacuum chamber in which the suction pressure is set to −0.06 MPa or more, and both are bonded to each other. Thereby, the lithium primary battery 1A of the present invention is obtained (6-5). In addition, the thickness of each part used for said assembly process is the total thickness of the separator 9, the positive electrode active material layer 4, and the negative electrode active material layer 5, and the positive electrode side frame member 2 and the negative electrode side frame member 3 after battery assembly. It adjusts so that it may become smaller than the total thickness of.

(Second embodiment)
FIG. 5 is a schematic cross-sectional view of a second embodiment of a lithium primary battery according to the present invention. The lithium primary battery 1B is different from the embodiment of FIG. 2 in that a spacer 16 is disposed between the positive electrode current collector 6 and the positive electrode side frame member 2. The subsequent configuration is the same as that of the embodiment shown in FIG. The spacer 16 is a resin sheet having a frame shape similar to that of the frame members 2 and 3, but a resin having a higher melting point than that of the frame members 2 and 3 (for example, PET: melting point of about 260 ° C.) is used. Therefore, it does not melt even when the seal portion 11 is formed, and plays a role of increasing the thickness of the seal portion 11. Further, the spacer 16 is narrower than the positive electrode side frame member 2 in the cross section of FIG. 5, and is disposed at a position surrounding the opening of the positive electrode frame member 2. Therefore, the positive electrode current collector 6 is bonded to the positive electrode side frame member 2 at a position over the spacer 16. According to such a configuration, the main surface 6p of the battery body 14 can be a concave surface having a large dent. And since a pressure can be received in the position of the spacer 16, it can prevent that a pressure concentrates on the battery main-body part 14. FIG. The spacer 16 is a position surrounding the opening of the negative electrode side frame member 3 and may be disposed between the negative electrode current collector 5 and the negative electrode side frame member 3. It can also be arranged on both the positive electrode side and the negative electrode side.

(Third embodiment)
FIG. 7 is a schematic cross-sectional view of a third embodiment of a lithium primary battery according to the present invention. The lithium primary battery 1C is such that both the positive-side main surface 26p and the negative-side main surface 27p of the battery body 24 are concave, the thickness of the negative-side frame member 23 and the thickness of the positive-side frame member 22 This is different from the previous embodiment in that a seal portion 21 is provided. The thickness of the seal portion 21 is adjusted to be equal to or greater than the thickness of the battery body portion 24, the two main surfaces 26g and 27g of the seal portion 21 are both flat, the separator 9 in the active material filling chamber 20, The point that the positive electrode active material layer 4 and the negative electrode active material layer 5 are disposed, the point that the positive electrode current collector 26 and the negative electrode current collector 27 are also used as an exterior material, and the like are the same as in the previous embodiment.

  In order to make the thickness of the seal portion 21 larger than the thickness of the battery body portion 24, the total thickness of the positive electrode side frame member 22 and the negative electrode side frame member 23 is set to the separator 9, the positive electrode active material layer 4, and the negative electrode active material. It is effective to make it larger than the total thickness of the layer 5. In addition, the thickness of the positive electrode side frame member 22 is made large and the thickness of the negative electrode side frame member 23 is made small. For example, when the thickness of the positive electrode side frame member 22 before battery assembly is D3 and the thickness of the negative electrode side frame member 23 is D4, adjustment is performed so as to satisfy 1/4 ≦ D4 / D3 ≦ 1/2. Then, as shown in FIG. 8, an ultrasonic welding jig 29 (or a heat welding jig) is attached only to the thin negative electrode side frame member 23 in the sealing step of bonding the positive electrode side frame member 22 and the negative electrode side frame member 23 to each other. Make contact. In this case, the boundary between the positive electrode side frame member 22 and the negative electrode side frame member 23 is compared with the case where the frame members 2 and 3 having the same thickness are used as in the embodiment described in FIGS. The energy of the ultrasonic welding jig 29 is easily transmitted to the vicinity. Therefore, the vicinity of the boundary between the two can be quickly melted and solidified, and as a result, the positive frame member 22 and the negative frame member 23 can be prevented from being excessively crushed. As a result, the thickness of the seal portion 21 can be made relatively larger than the thickness of the battery body portion 24 relatively easily.

  Further, if the heat welding jigs are arranged vertically and the sealing process shown in FIG. 8 is performed, it is considered that there is not much difference even if a pair of frame members having the same thickness are used. However, since the sealing process of FIG. 8 needs to be performed in a vacuum atmosphere, the manufacturing apparatus needs to be greatly improved, and the cost is high. In the lithium primary battery 1 </ b> C, the lithium foil constituting the negative electrode active material layer 5 is thinner than the positive electrode active material layer 4. Therefore, when the frame members 2 and 3 having the same thickness are used, the separator 9 is bent in the active material filling chamber 10 as in the embodiment shown in FIG. On the other hand, the bending of the separator 9 can be reduced by reducing the thickness of the negative electrode side frame member 23. According to such a structure, an improvement in the bending resistance of the lithium primary battery 1C can be expected.

  More preferably, the ratio between the thickness D3 of the positive electrode side frame member 22 and the thickness D4 of the negative electrode side frame member 23 is substantially equal to the ratio between the thickness of the positive electrode active material layer 4 and the thickness of the negative electrode active material layer 5. It is set to be. In this embodiment, the separator 9 is fixed to the negative electrode side frame member 23. However, a structure in which the separator 9 is fixed to the positive electrode side frame member 22 which is a thicker frame member may be adopted. However, if the separator 9 is fixed to the opening peripheral portion 23a of the negative electrode side frame member 23 which is the thinner frame member and the sealing step is performed as shown in FIG. Even if the portion 23a is deformed by the influence of heat, the amount of deformation is small because the negative electrode side frame member 23 itself is thin. As a result, a flatter finished seal portion 21 can be formed.

(Fourth embodiment)
FIG. 9 is a cross-sectional view showing an example in which the thin battery according to the present invention is configured as a lithium ion secondary battery. The lithium ion secondary battery 1D includes a battery main body portion 44 in which cells 32 as power generation elements are packaged with laminate outer packaging materials 41 and 42, and a seal portion that maintains the airtightness of the active material filling chamber 30 of the battery main body portion 44. 31. The cell 32 has a structure in which a positive electrode 48 is disposed on one surface side of the separator 39 and a negative electrode 49 is disposed on the other surface side. The positive electrode 48 includes a positive electrode active material layer 34 and a positive electrode current collector 36, and the negative electrode 49 includes a negative electrode active material layer 35 and a negative electrode current collector 37.

The positive electrode active material layer 34 includes a lithium composite oxide such as LiCoO 2, a binder made of a fluororesin such as a PVDF and HFP copolymer, a conductive auxiliary agent such as conductive carbon, and a lithium salt such as LiPF ₆ in ethylene. And a nonaqueous electrolytic solution dissolved in an organic solvent such as carbonate. The negative electrode active material layer 35 contains a graphite-based carbon material such as a mesofused carbon material, a conductive additive, and a nonaqueous electrolytic solution. The separator 39 is a microporous film of an insulating resin such as polyethylene or polypropylene. The positive electrode current collector 36 is a foil or a metal mesh made of Al or an Al alloy. The negative electrode current collector 37 is a foil or a metal mesh made of Cu or a Cu alloy. Laminate exterior materials 41 and 42 are metal-resin composite films in which resin films are attached to both surfaces of a metal foil such as an aluminum foil.

  As shown in FIG. 9, in the lithium ion secondary battery 1 </ b> D, the thickness of the seal portion 31 is larger than the thickness of the battery main body 44, and both main surfaces 41 p and 42 p of the battery main body 44 are concave. Yes. Although the laminate exterior materials 41 and 42 originally have a resin layer having heat fusion properties such as polypropylene, in order to secure the thickness of the seal portion 31, one laminate exterior material 41 and the other laminate exterior material 42. A frame-shaped sealing material 33 is sandwiched between them and these three members are bonded to each other. In this way, the resin layers of the laminate exterior materials 41 and 42 are partially increased, so that the thickness of the seal portion 31 can be made larger than the thickness of the battery body portion 44.

The perspective view of the lithium primary battery concerning this invention. AA sectional drawing in FIG. The schematic diagram explaining the relationship between the thickness of a seal | sticker part and the thickness of a battery main-body part. Action explanatory drawing at the time of IC card manufacture. Sectional drawing of the lithium primary battery of 2nd embodiment. Process explanatory drawing which shows the assembly procedure of the lithium primary battery of FIG. Sectional drawing of the lithium primary battery of 3rd embodiment. The figure explaining a sealing process. Sectional drawing of the lithium ion secondary battery of 4th embodiment. The exploded perspective view for demonstrating the manufacture procedure of an IC card.

Claims (7)

A separator (9, 39);
A positive electrode active material layer (4, 34) disposed on one surface side of the separator (9, 39);
A negative electrode active material layer (5, 35) disposed on the other surface side of the separator (9, 39);
A battery body (14, 40) in which the separator (9, 39), the positive electrode active material layer (4, 34) and the negative electrode active material layer (5, 35) are accommodated in an active material filling chamber (10, 20, 30). 24, 44),
A frame-shaped seal portion (11, 15, 21, 31) that seals the periphery of the battery body portion (14, 24, 44) and maintains the airtightness of the active material filling chamber (10, 20, 30). ,
In a cross section parallel to the thickness direction, the thickness of the seal part (11, 15, 21, 31) is adjusted to be greater than the thickness of the battery body part (14, 24, 44). Thin battery (1A, 1B, 1C, 1D).   At least one of the two main surfaces (6p, 26p, 42p, 7p, 27p, 41p) of the battery body (14, 24, 44) is a concave surface, and the seal portion (11, 15, 21, 31). The thin battery (1A, 1B, 1C, 1D) according to claim 1, wherein the thickness of the battery main body (14, 24, 44) is larger than the thickness of the battery main body (14, 24, 44). A separator (9, 39);
A positive electrode active material layer (4, 34) disposed on one surface side of the separator (9, 39);
A negative electrode active material layer (5, 35) disposed on the other surface side of the separator (9, 39);
A battery body (14, 40) in which the separator (9, 39), the positive electrode active material layer (4, 34) and the negative electrode active material layer (5, 35) are accommodated in an active material filling chamber (10, 20, 30). 24, 44),
A frame-shaped seal portion (11, 15, 21, 31) that seals the periphery of the battery body portion (14, 24, 44) and maintains the airtightness of the active material filling chamber (10, 20, 30). ,
In the cross section parallel to the thickness direction, the battery body (14, 24, 44) and the seal (11, 15, 21, 44) are arranged so that the battery body (14, 24, 44) is concave. 31) and a thin battery (1A, 1B, 1C, 1D).   The thin battery (1A) according to any one of claims 1 to 3, wherein a melting point of a resin having heat-fusibility constituting the seal portion (11, 15, 21, 31) is 110 ° C or higher and 200 ° C or lower. , 1B, 1C, 1D).   The seal part (15) is made of a frame member (2, 3) as a seal material made of the resin having the heat-fusibility and a material having a melting point higher than that of the frame member (2, 3). The thin battery (1B) of any one of Claims 1 thru | or 4 including the spacer (16) which raises the thickness of a part (15). Resin frame members (22, 23) surrounding the separator (9), the positive electrode active material layer (4), and the negative electrode active material layer (5);
A positive electrode current collector (26) holding the positive electrode active material layer (4) between the separator (9), and
A negative electrode current collector (27) holding the negative electrode active material layer (5) between the separator (9),
The active material filling chamber (20) is formed between the positive electrode current collector (26) and the negative electrode current collector (27), and the separator (9) and the positive electrode are formed in the active material filling chamber (20). The battery main body (24) having the positive electrode current collector (26) and the negative electrode current collector (27) as exterior materials by accommodating the active material layer (4) and the negative electrode active material layer (5). While
The frame member (22, 23) comprises a positive electrode side frame member (22) and a negative electrode side frame member (23) bonded to each other,
By fixing the outer peripheral part of the positive electrode current collector (26) to the positive electrode side frame member (22) and fixing the outer peripheral part of the negative electrode current collector (27) to the negative electrode side frame member (23). The seal portion (21) where the positive electrode current collector (26) and the negative electrode current collector (27) are positioned above and below the frame members (22, 23) in the thickness direction of the thin battery (1C). Composed and
The thin battery (1C) according to any one of claims 1 to 4, wherein a thickness of the positive electrode side frame member (22) is different from a thickness of the negative electrode side frame member (23). The negative electrode active material layer (5) is configured as a lithium primary battery made of lithium or a lithium alloy,
Having an outer peripheral portion of the separator (9) fixed to the positive electrode side frame member (22) or the negative electrode side frame member (23);
The thin battery (1C) according to claim 6, wherein a thickness of the positive electrode side frame member (22) is larger than a thickness of the negative electrode side frame member (23).

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