JP2009158440A - Thin battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin battery which can improve its reliability. <P>SOLUTION: The thin battery includes a positive electrode composition section 10, and a negative electrode composition section 20 arranged opposite to the positive electrode composition section 10. Further, the thin battery has a separator 30 arranged between the positive electrode composition section 10 and the negative electrode composition section 20 and partitioning a positive electrode side and a negative electrode side, and a plurality of firmly-fixing sections 40 firmly fixing a part of the positive electrode side and the negative electrode side and formed by separating each other and having insulation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thin battery, for example, a flexible thin battery.

  Recently, as a simple recording medium replacing a magnetic card, the demand for an IC card with a built-in microcomputer has increased. The mainstream of power supply to an IC card without an internal power supply is an electromagnetic induction type. For this reason, there is an inconvenience that a dedicated terminal is required for writing the recorded data or new data in the IC card. Recently, an attempt has been made to provide an internal power supply in such an IC card to display stored contents and to provide a security function input function.

  For example, as shown in FIG. 10, a battery incorporated in an IC card or the like includes a negative electrode current collector 21 in which a negative electrode material 22 is formed and a positive electrode current collector 11 in which a positive electrode material 12 is formed. And having a configuration of being opposed to each other. And these are covered with the exterior material 32 with the electrolyte 31. In addition, for example, a battery having flexibility as disclosed in Patent Document 1 and a thin battery such as disclosed in Patent Document 2 in which large wrinkles do not remain on the surface even after repeated bending operations have been devised. Yes.

  For example, as shown in FIG. 11, a battery to be incorporated into an IC card or the like has been proposed in which a plurality of positive electrode materials 12 and negative electrode materials 22 are divided and arranged. For example, Patent Documents 3 and 4 disclose a configuration in which partition walls are formed in a lattice shape and a battery component is divided into a plurality of parts. Patent Document 5 discloses a configuration in which a plurality of battery elements in the same battery configuration are divided and arranged. Thereby, characteristic deterioration due to expansion / contraction of the electrode or breakage due to impact can be alleviated.

  A battery incorporated in such an IC card is required to have physical characteristics that can withstand 1000 cycles of bending cycle tests and the same number of torsion cycle tests in the physical characteristics items of the IC card ISO standard. However, none of the batteries described above was sufficient for physical properties such as bending and twisting.

In addition to IC cards, flexible displays and electronic paper have also been proposed as thin battery usage fields, and similar resistance to physical properties such as bending and twisting and reliability against expansion and contraction due to temperature are required. ing.
Japanese Patent Laid-Open No. 2-213052 JP 2006-172766 A Japanese Patent Application Laid-Open No. H5-283055 JP-A-6-215753 JP 2001-15153 A

  As a bending and twisting cycle test of a thin battery, characteristics exceeding the durability in a physical characteristic cycle test imposed on an IC card are required. For example, if the thin battery is bent and returned to its original shape, tensile stress is applied to the electrode layer on the convex surface side, and compressive stress is applied to the concave side. Slip stress occurs between the collector and electrode material of the electrode layer on the side subjected to tensile stress, and wrinkles or peeling occurs in the other electrode layer that receives compressive stress to release the compressive stress. become. Furthermore, when the bending test is repeated, if the current collectors 11 and 21 and the electrode materials 12 and 22 are wrinkled, peeled off, and the current collectors 11 and 12 are cracked, the separator 30 may be damaged, or the internal resistance of the battery The battery function may be fatally affected. Further, there is a similar problem with respect to repeated changes such as expansion and contraction due to temperature changes. In addition, wrinkles and cracks generated in the thin battery may be transferred to the surface of the IC card or the like, which causes a problem that the aesthetic appearance of the IC card is impaired.

  Further, as in Patent Documents 3 and 4, when partition walls are formed in a lattice shape and battery components are completely partitioned, an electrolyte must be formed in each portion. For this reason, there existed a subject that workability | operativity fell. Moreover, since electrolyte is formed in each part, it was difficult to make electrolyte concentration uniform, and there existed a subject that battery reliability fell.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin battery with improved battery reliability.

  The thin battery of the present invention is arranged between the positive electrode component, the negative electrode component disposed opposite to the positive electrode component, the positive electrode component and the negative electrode component, and divides the positive electrode side and the negative electrode side. Separators, and a part of the positive electrode side and the negative electrode side are fixed, a plurality of the spacers are formed apart from each other, and an insulating fixing part is provided.

  According to the present invention, a thin battery with improved battery reliability can be provided.

  Embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the thin battery of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a configuration of a thin battery of the present invention.

  The thin battery has a configuration in which the positive electrode component 10 and the negative electrode component 20 are arranged to face each other. The positive electrode component 10 has a configuration in which, for example, a positive electrode current collector and a positive electrode material are laminated. Similarly, the negative electrode component 20 has a configuration in which, for example, a negative electrode current collector and a negative electrode material are laminated. In this case, each electrode material (a positive electrode material and a negative electrode material) is opposed to each other. A separator 30 is disposed between the positive electrode component 10 and the negative electrode component 20. Further, for example, the separator 30 may be a solid electrolyte, and the separator 30 may have an electrolyte role. Of course, an electrolyte such as an electrolytic solution may be used separately.

  The positive electrode side and the negative electrode side are divided by the separator 30. In FIG. 1, the lower side from the separator 30 is the positive electrode side, and the upper side from the separator 30 is the negative electrode side. Here, the positive electrode side is not limited to the positive electrode component 10, and includes all components disposed below the separator 30. Similarly, the negative electrode side includes not only the negative electrode component 20 but also all components disposed above the separator 30. For example, when the thin battery further includes an exterior material that covers the positive electrode component 10, the negative electrode component 20, and the separator 30, the positive electrode side includes an exterior material below the separator 30. Similarly, the negative electrode side includes an exterior material above the separator 30.

  And the adhering part 40 adheres a part of positive electrode side and negative electrode side. A plurality of the fixing portions 40 are formed apart from each other and have insulating properties. Note that a plurality of the fixing portions 40 may be formed at a constant interval, or a plurality of fixing portions 40 may be formed at different intervals as necessary. In this way, by forming a plurality of the fixing portions 40 apart from each other, the battery constituent material including the positive electrode component 10, the negative electrode component 20, and the separator 30 may not be provided separately. Thereby, workability | operativity improves. The thin battery of the present invention is configured as described above.

  As described above, by fixing a part by the fixing part 40, an effect of particularly improving reliability is realized with respect to repeated changes such as bending and twisting due to a physical characteristic test or expansion and contraction due to a temperature change or the like. be able to. Further, by forming the fixing portions 40 apart from each other, the battery constituent materials may not be provided separately. For this reason, the concentration of the electrolyte becomes uniform. In addition, when an electrolytic solution is provided as an electrolyte, the injection of the electrolytic solution is facilitated. Thereby, workability | operativity and battery reliability improve.

Embodiment 1.
Next, specific embodiments will be described in detail with reference to FIGS. FIG. 2 is a top view showing the configuration of the thin battery according to the present embodiment. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. Here, a typical lithium secondary battery will be described as an example.

  In the present embodiment, a plurality of positive electrode materials 12 are formed on the surface of the positive electrode current collector 11 on the negative electrode component portion 20 side. The positive electrode current collector 11 and the positive electrode material 12 become the positive electrode component 10. Similarly, a plurality of negative electrode materials 22 are formed on the surface of the negative electrode current collector 21 on the positive electrode component 10 side. The negative electrode current collector 21 and the negative electrode material 22 become the negative electrode component 20. As shown in FIG. 2, the current collectors 11 and 21 are formed in an airtight adhesive layer 50 described later. Further, the positive electrode current collector 11 has an electrode tab 13 in part. Specifically, the current collector 11 is formed in a rectangular shape with a part protruding, and the protruding part becomes the electrode tab 13. And only the electrode tab 13 is formed to the outside of the exterior material 32 described later so that it can be connected to the positive electrode current collector 11 from the outside. Similarly, the negative electrode current collector 21 has an electrode tab 23 in a part, and only the electrode tab 23 is formed to the outside of the exterior material 32. As a result, current can be supplied from the positive electrode current collector 11 and the negative electrode current collector 21 to the outside during discharge. In addition, current can be supplied from the outside to the positive electrode current collector 11 and the negative electrode current collector 21 during charging. As the positive electrode current collector 11, an aluminum foil having a thickness of 10 μm to 50 μm can be used. Moreover, as the negative electrode current collector 21, a copper foil of about several μm to 50 μm can be used.

  As shown in FIG. 2, each of the positive electrode material 12 and the negative electrode material 22 has a rectangular shape and is regularly formed in a matrix shape. The positive electrode material 12 and the negative electrode material 22 are arranged to face each other. As the positive electrode material 12, cobalt lithium or the like is generally used, and as the negative electrode material 22, graphite or the like is generally used. A separator 30 is disposed between the positive electrode material 12 and the negative electrode material 22. A plurality of separators 30 are not disposed between the positive electrode material 12 and the negative electrode material 22, but a single separator 30 is disposed between the plurality of positive electrode materials 12 and the plurality of negative electrode materials 22. . The separator 30 may be made of polyethylene, polypropylene, or a nonwoven fabric in which both are stacked. Further, the thickness of the separator 30 is desirably about several μm to 50 μm.

An electrolyte 31 such as an electrolytic solution is formed in the space between the positive electrode current collector 11 and the negative electrode current collector 21. As an electrolytic solution, a lithium salt or the like dissolved in an organic solvent such as ethylene carbonate (EC) or propylene carbonate (PC) can be used. For example, LiBF ₄ and LiPF ₆ are often used as the type of lithium salt.

  Between the positive electrode current collector 11 and the negative electrode current collector 21, a support body 41 as a fixing portion 40 is formed between the positive electrode materials 12 and between the negative electrode materials 22. That is, as shown in FIG. 3, the positive electrode material 12 and the support body 41 are alternately arranged in the lateral direction between the positive electrode current collector 11 and the negative electrode current collector 21. Similarly, the negative electrode material 22 and the support body 41 are alternately arranged in the horizontal direction between the positive electrode current collector 11 and the negative electrode current collector 21. As shown in FIG. 2, the upper surface of the support body 41 has a cross shape. Further, the support body 41 is formed uniformly and in a limited manner between the positive electrode current collector 11 and the negative electrode current collector 21. As shown in FIG. 2, the support body 41 is not formed so as to surround each positive electrode material 12 or negative electrode material 22. That is, the support body 41 is not formed in a lattice shape, but a plurality of support bodies 41 are formed at regular intervals. In other words, the adjacent positive electrode material 12 is not completely partitioned by the support body 41 and communicates with the adjacent positive electrode material 12 in the vicinity of the center of the four sides of the rectangular positive electrode material 12. The same applies to the negative electrode material 22.

  In the present embodiment, support bodies 41 are formed on both surfaces of separator 30, respectively. In addition, in the top view, the support bodies 41 formed on both surfaces of the separator 30 are formed so as to overlap each other. That is, the support 41 has a shape that is divided by the separator 30. Further, since the support body 41 is formed on the separator 30, the position of the support body 41 is controlled by the separator 30. The support 41 has a predetermined thickness, and is controlled so that the positive electrode current collector 11 and the negative electrode current collector 21 are at a constant interval. In the present embodiment, the support body 41 has substantially the same thickness as the electrode materials 12 and 22. That is, the current collectors 11 and 21 in contact with these have a planar shape.

  Thus, the support body 41 physically connects a part between the current collectors 11 and 21 with the separator 30 interposed therebetween. Specifically, the positive electrode current collector 11 and the separator 30 are supported by a support 41 on the positive electrode side. Similarly, the negative electrode current collector 21 and the separator 30 are supported by a support 41 on the negative electrode side. Thus, the support 41 is preferably an insulator in order to physically connect a part between the current collectors 11 and 21. In the present embodiment, the current collectors 11 and 21 are connected to each other through the insulating separator 30. However, the nonwoven fabric or the like used as the separator 30 is thin and has a large number of small holes. For this reason, it is preferable that the separator 30 is an insulator. Further, since the current collectors 11 and 21 are generally made of metal as described above, the support 41 is preferably made of a resin having excellent adhesion to the metal. For example, an ionomer resin or the like is used as the support 41 from the viewpoint of good adhesion with metal. In addition, since the support 41 is also in contact with the electrolyte 31, it is also important that the support 41 is not easily affected by an organic solvent used for the electrolyte 31, for example.

  The battery constituent material and the support 41 are covered and sealed with an exterior material 32 made of a flexible film. Moreover, the exterior material 32 covers so that these may be pressurized inside. That is, the exterior material 32 is in close contact with the positive electrode current collector 11 and the negative electrode current collector 21. For this reason, the upper surface of the exterior member 32 has a shape along the positive electrode current collector 11, and the lower surface has a shape along the negative electrode current collector 21. Thus, by covering these with the positive electrode current collector 11 and the negative electrode current collector 21 in close contact with each other, the positive and negative electrodes are pressed and held at a predetermined pressure, and the mechanical strength is strengthened. As the exterior member 32, a resin-metal-resin laminate material is used. In many cases, this laminate material uses aluminum as a metal, and the resin layer has a surface layer insulated with PET or polyethylene. Further, the exterior member 32 has an adhesive layer made of a resin or the like on the current collector 11, 21 side surface (inner surface of the exterior material 32) when sealing the battery constituent material or the like. The adhesive layer may be formed on the entire inner surface of the exterior material 32, or may be formed only at a necessary location. Then, with this adhesive layer, the outer packaging material 32 is adhered in a frame shape so as to surround the battery constituent material and the support body 41, thereby forming an airtight adhesive layer 50. The thin battery according to the present embodiment is configured as described above.

  The thin battery according to the present embodiment is formed in a sheet shape as a whole. However, since the support body 41 is formed, it has sufficient mechanical strength against bending, twisting, and the like, which are physical characteristics. That is, it is possible to suppress wrinkles between the current collectors 11 and 21 and the electrode materials 12 and 22, peeling, and cracks in the current collectors 11 and 12. For this reason, the fatal influence with respect to the function of a battery, such as damage to the separator 30 and a raise of internal resistance of a battery, can be suppressed. Similarly, a fatal influence on the function of the battery can be suppressed even in the case of repeated changes such as expansion and contraction due to temperature changes. Thus, in this embodiment, the characteristics of the thin battery can be improved. Further, as in the present embodiment, the battery constituent material is hermetically sealed by the exterior material 32. Specifically, the exterior material 32 is pressed and held between the positive and negative electrodes at a predetermined pressure, and the exterior material 32 and the current collectors 11 and 12 are in close contact with each other. This further improves the mechanical strength of the battery. Moreover, in this Embodiment, the electrode materials 12 and 22 are divided | segmented and formed in multiple numbers. Thereby, an external stress can be disperse | distributed.

  Next, the manufacturing method of the thin battery concerning this Embodiment is demonstrated. First, the positive electrode component 10 is formed on one surface of the positive electrode current collector 11 by applying the positive electrode material 12 with a predetermined thickness and arrangement, for example, by screen printing or the like. Next, the negative electrode component 20 is formed on one surface of the negative electrode current collector 21 by applying the negative electrode material 22 with a predetermined thickness and arrangement, for example, by screen printing or the like.

  Next, the paste-like support body 41 is printed on both surfaces of the separator 30 with a predetermined dimension. Moreover, the support body 41 formed on each surface of the separator 30 is printed so as to overlap in a top view. And battery constituent materials, such as the positive electrode collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, and the negative electrode collector 21, are piled up in order. At this time, it is important that the negative electrode material 22 is accurately formed at the facing portion of the positive electrode material 12 and the support body 41 is formed at a portion where the positive electrode material 12 and the negative electrode material 22 are not present. Then, the positively positioned current collector 11 and the negative electrode current collector 21 are joined to each other with the accurately positioned support 41 portion by thermocompression bonding or ultrasonic fusion to obtain a battery constituent material.

  Next, the battery constituent material is inserted into the outer packaging material 32 formed into a bag shape or a case shape. Only the electrode tabs 13 and 23 protrude from the exterior material 32. Then, an electrolyte solution as the electrolyte 31 is injected into the exterior member 32. As described above, the adjacent electrode members 12 and 22 are not completely partitioned by the support body 41, and the electrode members 12 and 22 communicate with each other. For this reason, it is not necessary to inject | pour electrolyte solution separately, and can inject easily. And work efficiency improves. Further, the concentration of the electrolytic solution can be made uniform. In addition, the electrode materials 12 and 22 can be appropriately impregnated with an electrolytic solution in advance, or can be kneaded during formation.

  The exterior material 32 is made of, for example, a metal laminate sheet, and has an adhesive layer on the inner surface. Finally, the adhesive layer around the battery constituent material of the exterior member 32 is melted and solidified in a vacuum atmosphere or a reduced pressure atmosphere to form the airtight adhesive layer 50. Thereby, sealing of a battery constituent material is completed and a thin battery is obtained. Note that the sealing may be performed while sucking air from between the positive electrode current collector 11 and the negative electrode current collector 21, for example, without being in a vacuum atmosphere or a reduced pressure atmosphere. Through the above steps, the thin battery according to the present embodiment is manufactured.

  As described above, the manufactured thin battery has a strong mechanical strength between the positive and negative electrodes. Therefore, electrical reliability and physical characteristics such as bending and twisting are significantly improved. Moreover, in the present embodiment, when the exterior material 32 is pressure-fused, it is sealed, for example, in a decompression chamber. Therefore, the inside of the thin battery is in a reduced pressure state, and both electrode materials are further pressurized at atmospheric pressure during normal use. Therefore, an effect of further improving the electrical reliability of the thin battery can be obtained.

  In the present embodiment, a process called screen printing is adopted for forming the electrode materials 12 and 22. Thus, instead of printing the paste-like electrode materials 12 and 22, the electrode materials 12 and 22 previously formed in a film shape can be used. In the case of the film-like electrode materials 12 and 22, they can be punched into a predetermined size or shape and placed on the separator 30 to facilitate positioning. In addition, there is an advantage that a printing mask is not required.

  Although this embodiment has been described by taking a lithium ion secondary battery as an example, it goes without saying that the present embodiment can be applied to other thin batteries such as a lithium primary battery, an all-solid secondary battery, and a manganese battery. Further, the thin battery according to this embodiment can be used for a card-type terminal, a flexible display, electronic paper, and the like. The following embodiments can also be applied to various batteries and can be used in various fields.

Embodiment 2. FIG.
Since the basic configuration of the present embodiment is the same as that of the first embodiment, only the differences from the first embodiment will be described. First, the configuration of the thin battery according to this embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view showing a configuration of a thin battery. FIG. 5 corresponds to FIG. 3 of the first embodiment, and FIGS. 2 and 4 are common to the present embodiment.

  In the present embodiment, the separator 30 has a plurality of holes. This hole is in a portion where the support 41 and the separator 30 are in contact with each other in the first embodiment. That is, the holes of the separator 30 have substantially the same shape as the upper surface of the support body 41. The support 41 passes through the holes of the separator 30 and directly supports and supports a part of the positive electrode current collector 11 and the negative electrode current collector 21. That is, the support body 41 is not divided by the separator 30, and the positive electrode side support body 41 and the negative electrode side support body 41 of the first embodiment are integrally formed. The support 41 has a thickness different from that of the first embodiment, but the upper surface shape, the formation location, and the like are the same as those of the first embodiment.

  The support 41 is thinner than the thickness when the electrode members 12 and 22 and the separator 30 are stacked. That is, the current collectors 11 and 21 that are in contact with each other have a shape that is recessed inward at the portion that contacts the support 41. For this reason, the height between the positive electrode current collector 11 and the negative electrode current collector 21 is lower in the portion in contact with the support 41 than in the peripheral portion thereof. Further, as in the first embodiment, the outer packaging material 32 has a shape along the current collectors 11 and 21, and therefore, the thickness of the thin battery as a whole is lower in the support 41 portion than in its peripheral portion. That is, the thin battery is thinner at the support 41 portion than at the periphery thereof. Thereby, the positive electrode material 12 and the negative electrode material 22 are held under pressure. Due to the presence of the support 41, the mechanical strength between the positive and negative electrodes is further strengthened.

  Further, as in the first embodiment, the adjacent positive electrode members 12 are not completely partitioned by the support body 41. For this reason, the support body 41 is not completely partitioned by the separator 30. Therefore, it is not necessary to divide the separator 30 as long as a hole is opened at a location corresponding to the support body 41.

  This embodiment also has the same effect as that of the first embodiment. Furthermore, since the positive electrode current collector 11 and a part of the negative electrode current collector 21 are directly fixed by the support body 41, there is a synergistic effect that the battery constituent material is easily held under pressure. That is, the mechanical strength of the thin battery is further increased. Therefore, electrical reliability and physical characteristics such as bending and twisting are further improved.

  Next, the manufacturing method of the thin battery concerning this Embodiment is demonstrated. First, as in the first embodiment, the positive electrode material 12 is formed on the positive electrode current collector 11, and the negative electrode material 22 is formed on the negative electrode current collector 21. Thereby, the positive electrode component 10 and the negative electrode component 20 are formed. And it is desirable to form the support body 41 in the positive electrode collector 11 or the negative electrode collector 21 by printing etc., for example.

  Further, the separator 30 is punched by punching out a portion where the support 41 and the separator 30 are in contact with each other in the first embodiment. The holes of the separator 30 are formed according to the shape of the support body 41. Thereby, when the positive electrode component 10 and the negative electrode component 20 are stacked via the separator 30, the support 41 and the separator 30 do not interfere with each other. And battery constituent materials, such as the positive electrode collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, and the negative electrode collector 21, are piled up in order. Thereby, a part of the positive electrode current collector 11 and the negative electrode current collector 21 is directly fixed and supported by the support body 41. Moreover, after these are piled up, the support body 41 part is pressure-compressed and joined. As a result, the current collectors 11 and 21 in the support 41 portion are recessed inward. Next, the battery constituent material is inserted into the outer material 32 formed in a bag shape or a case shape, and an electrolyte solution as the electrolyte 31 is injected. Finally, the adhesive layer around the battery constituent material of the exterior member 32 is melted and solidified in a vacuum atmosphere or a reduced pressure atmosphere to form the airtight adhesive layer 50. At this time, the support portion may also be pressure-fused simultaneously. Thereby, sealing of a battery constituent material is completed and a thin battery is obtained.

  As in the present embodiment, a hole may be formed in a part of the separator 30, but it is also possible to use fine pores of the separator 30 without forming a hole. Thereby, the manufacturing method of a thin battery can be simplified. Here, before the battery constituent material is inserted into the exterior member 32, the support 41 portion is compressed and compressed, but the present invention is not limited to this. For example, after the current collectors 11 and 21 and the support body 41 are joined and inserted into the outer packaging material 32, the support 41 portion is formed when the adhesive layer around the battery constituent material of the outer packaging material 32 is melted and solidified. You may pressurize and compress.

Embodiment 3 FIG.
Since the basic configuration of this embodiment is the same as that of Embodiments 1 and 2, only the differences from Embodiments 1 and 2 will be described. First, the configuration of the thin battery according to the present embodiment will be described with reference to FIGS. FIG. 6 is a top view showing the configuration of the thin battery. 7 is a cross-sectional view taken along the line VII-VII in FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

  As shown in FIG. 6, the current collectors 11 and 21 have a plurality of holes. The electrode materials 12 and 22 are integrally formed without being divided into a plurality. Thereby, battery capacity can be enlarged. The outer shapes of the electrode materials 12 and 22 are rectangular. Similarly to the current collectors 11 and 21, the electrode materials 12 and 22 also have a plurality of holes. The separator 30 also has a plurality of holes. When viewed from above, the current collectors 11 and 21, the electrode materials 12 and 22, and the holes of the separator 30 are formed to overlap each other. Moreover, these holes have substantially the same shape. In the present embodiment, these holes have a circular shape. That is, a plurality of through holes 51 penetrating the battery constituent material are formed. The through hole 51 is formed corresponding to the support portion. That is, a plurality of through holes 51 are formed apart from each other. The through holes 51 are arranged in a matrix. And the support body 41 passes the through-hole 51, and supports the exterior materials 32 mutually.

  Moreover, the upper surface of the support body 41 has a circular shape like the above-mentioned holes. That is, the support body 41 has a cylindrical shape. The thickness of the support 41 is approximately the same as that of the second embodiment, and is thinner than the thickness when the electrode materials 12 and 22 and the separator 30 are stacked. That is, the exterior material 32 in contact with these on the positive electrode side and the negative electrode side has a shape recessed inward at the portion in contact with the support body 41. For this reason, the height between the positive electrode-side exterior material 32 and the negative electrode-side exterior material 32 is lower in the portion in contact with the support 41 than in the peripheral portion. That is, the thin battery is thinner at the support 41 portion than at the periphery thereof. Thereby, the battery constituent material is held under pressure. That is, the presence of the support 41 further increases the mechanical strength between the positive and negative electrodes. In this way, if the battery constituent material is held under pressure, the positive electrode current collector 11 and the negative electrode current collector 21 may be fixed as in the first and second embodiments, or as in the present embodiment. The exterior members 32 may be fixed together.

  This embodiment also has the same effect as the above embodiment. Moreover, in this Embodiment, since the exterior materials 32 are mutually fixed by the support body 41, the breadth of selection of resin used for the support body 41 spreads. Further, since it is not necessary to use a relatively expensive resin such as an ionomer, there is a synergistic (extraordinary) effect that leads to cost reduction.

  Next, the manufacturing method of the thin battery concerning this Embodiment is demonstrated. A portion corresponding to a part of the support 41 of the positive electrode current collector 11 and the negative electrode current collector 21 is punched in advance to make a hole. In addition, the positive electrode material 12 and the negative electrode material 22 are also punched by punching a portion corresponding to the support body 41 in advance. Then, the positive electrode material 12 is fixed on the positive electrode current collector 11, and the negative electrode material 22 is fixed on the negative electrode current collector 21. As described above, the electrode materials 12 and 22 may be fixed on the current collectors 11 and 21 after the holes are formed, but the electrode materials 12 and 22 are formed on the current collectors 11 and 21. A hole may be drilled from.

  And the part corresponding to the support body 41 of the separator 30 is punched out, and a hole is opened. Next, battery constituent materials such as the positive electrode current collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, and the negative electrode current collector 21 are sequentially stacked. At this time, the support body 41 is arrange | positioned so that the hole formed in each, ie, the through-hole 51 of a battery constituent material, may be passed. Next, a battery constituent material is inserted into the outer packaging material 32 formed in a bag shape or a case shape, and an electrolytic solution as the electrolyte 31 is injected. Then, a portion of the adhesive layer corresponding to the support body 41 of the exterior material 32 is melted and solidified to directly fix the exterior material 32 to each other with the support body 41. And the sealing of the exterior material 32 is completed and a thin battery is obtained. In addition, you may perform adhesion | attachment of the exterior material 32 and the support body 41, and sealing of the exterior material 32 simultaneously. Thereby, a manufacturing process can be simplified.

  By not dividing the electrode materials 12 and 22 as in the present embodiment, the accuracy of the sheet is improved. Furthermore, workability can be improved.

Embodiment 4 FIG.
In the present embodiment, the support body 41 is different from the third embodiment. Since other configurations are the same as those in the third embodiment, description thereof is omitted. First, the configuration of the thin battery according to this embodiment will be described with reference to FIG. FIG. 9 is a cross-sectional view showing the configuration of a thin battery.

  As in the third embodiment, the battery constituent material has a plurality of through holes 51. Further, in the present embodiment, the support body 41 is not formed. Then, the exterior materials 32 are bonded together by the adhesive layer 42 of the exterior material 32. That is, in the through-hole 51, the positive electrode-side packaging material 32 and the negative electrode-side packaging material 32 are bonded by the adhesive layer 42. Although not shown in the cross-sectional views of the present embodiment and the other embodiments, a portion where the exterior material 32 is bonded to the outer periphery (the airtight bonding layer 50 portion in the top view) is also bonded by the bonding layer 42. The As described above, the battery constituent material can be held under pressure by the adhesive layer 42 as the fixing portion as in the third embodiment. Moreover, according to this Embodiment, it is not necessary to form members, such as a support body, separately as an adhering part, and the structure of a thin battery can be simplified.

  Next, the manufacturing method of the thin battery concerning this Embodiment is demonstrated. As in the third embodiment, the positive electrode component 10 and the negative electrode component 20 are formed. And the part corresponding to the collectors 11 and 21 of the separator 30 and the hole of the electrode materials 12 and 22 is punched out, and a hole is opened. Next, battery constituent materials such as the positive electrode current collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, and the negative electrode current collector 21 are sequentially stacked. Next, a battery constituent material is inserted into the outer packaging material 32 formed in a bag shape or a case shape, and an electrolytic solution as the electrolyte 31 is injected. Then, in a vacuum atmosphere or a reduced-pressure atmosphere, a portion of the adhesive layer 42 corresponding to the through hole 51 of the exterior material 32 is melted and solidified to directly adhere the exterior materials 32 to each other. And the sealing of the exterior material 32 is completed and a thin battery is obtained.

  As in the present embodiment, by using only the adhesive layer 42 of the exterior material 32 for fixing, the support 41 is not required. For this reason, in this Embodiment, since it is not necessary to arrange | position and adhere | attach the resin equivalent to the support body 41, manufacture becomes easy. In addition, there is a synergistic (extraordinary) effect that it leads to cost reduction from process reduction and material cost reduction, and further positioning becomes easy. In addition, in Embodiment 3 and this Embodiment, although the electrode materials 12 and 22 were not divided | segmented, you may divide | segment. In this case, the same effect can be obtained.

It is sectional drawing which shows the structure of the thin battery of this invention. 1 is a top view showing a configuration of a thin battery according to Embodiment 1. FIG. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. 4 is a cross-sectional view showing a configuration of a thin battery according to Embodiment 2. FIG. 6 is a top view showing a configuration of a thin battery according to Embodiment 3. FIG. It is VII-VII sectional drawing of FIG. It is VIII-VIII sectional drawing of FIG. 6 is a cross-sectional view showing a configuration of a thin battery according to Embodiment 4. FIG. It is sectional drawing which shows the structure of a related thin battery. It is sectional drawing which shows the structure of another related thin battery.

Explanation of symbols

10 positive electrode components, 11 positive electrode current collector, 12 positive electrode material, 13 electrode tab,
20 negative electrode component, 21 negative electrode current collector, 22 negative electrode material, 23 electrode tab,
30 separator, 31 electrolyte, 32 exterior material,
40 fixing part, 41 support, 42 adhesive layer,
50 airtight adhesive layer, 51 through hole

Claims (8)

A positive electrode component;
A negative electrode component disposed opposite to the positive electrode component;
A separator disposed between the positive electrode component and the negative electrode component and dividing the positive electrode side and the negative electrode side;
A thin battery comprising a plurality of fixed portions, each having a positive electrode side and a negative electrode side fixed, spaced apart from each other, and having insulating properties. Covering the battery constituent material having the positive electrode constituent part, the negative electrode constituent part, and the separator, and having an exterior material made of a flexible film,
The thin battery according to claim 1, wherein the exterior material is in close contact with the positive electrode component and the negative electrode component.   The thin battery according to claim 1, wherein the fixing portion is thinner than a peripheral portion thereof. The positive electrode component has a positive electrode current collector and a positive electrode material formed on the positive electrode current collector,
The negative electrode component has a negative electrode current collector and a negative electrode material formed on the positive electrode component side of the negative electrode current collector,
The thin battery according to any one of claims 1 to 3, wherein the fixing portion fixes the positive electrode current collector and the negative electrode current collector. Having a hole penetrating the separator;
The thin battery according to claim 4, wherein the fixing portion is a support that passes through the hole and supports the positive electrode current collector and the negative electrode current collector.   The thin battery according to claim 2 or 3, wherein the fixing portion fixes the exterior material on the positive electrode side and the exterior material on the negative electrode side. Having a through-hole penetrating the battery constituent material;
The thin battery according to claim 6, wherein the fixing portion is a support that passes through the through hole and supports the exterior material on the positive electrode side and the exterior material on the negative electrode side. Having a through-hole penetrating the battery constituent material;
The thin battery according to claim 6, wherein the fixing portion is an adhesive layer that bonds the exterior material on the positive electrode side and the exterior material on the negative electrode side in the through hole.

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