JP2013101829A - Tabular secondary battery and electronic apparatus system including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tabular secondary battery with excellent shape stability, which can reduce the redundancy of electric wires and the like at the installation in an apparatus.SOLUTION: A tabular secondary battery according to the present invention includes: a flat electrode group 11; an electrolyte; a tabular battery case 1 for housing the electrode group 11 and the electrolyte; and a support post 3 disposed penetrating the electrode group 11 in a thickness direction. The support post 3 restricts the deformation of both main surfaces 4 of the battery case 1 in a manner that both ends of the support post 3 are bonded to both main surfaces 4 of the battery case 1. The electrode group 11 is formed by stacking or winding in a flat manner a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. The support post 3 has a tube shape, and both main surfaces 4 of the case 1 are each provided with an opening 4a communicating with a hollow part of the support post 3. The hollow part of the support post 3 and the opening 4a of the case 1 form a penetration hole 5 penetrating the case 1 in a thickness direction and separated from a space of the case 1 housing the electrode group 11 and the electrolyte.

Description

  The present invention relates to a plate-like secondary battery and an electronic device system using the same.

  Electronic devices are becoming higher performance and smaller and thinner. At the same time, high performance and miniaturization / thinning are also demanded for devices incorporated in electronic equipment. In response to this, various process technologies including thin film technology are widely deployed in device development. In addition, the thinning of devices plays an important role not only in direct user merits but also in environmental aspects such as protection of earth resources and reduction of power consumption. In the evolution of such devices, efforts have been made to meet demands for thin and high capacity batteries for driving electronic devices.

  Various batteries are used as batteries built in electronic devices. Lithium batteries that can be driven for a long time, in particular, lithium ion secondary batteries that can be used repeatedly are widely used. Lithium ion secondary batteries are widely used in terms of shape, cylindrical and rectangular. From the technical point of view, the cylindrical type is preferable because a high energy density is more easily obtained. However, from the viewpoint of miniaturization and thinning, electronic devices are often used in a rectangular shape. Furthermore, along with an increase in demand for large-sized thin batteries, the introduction of laminated batteries having a laminated pack as an exterior in place of aluminum and iron cases for rectangular batteries is also in progress.

  In thin batteries, shape stability is important. Thin batteries that are often installed in a limited space are required to maintain the designed thin shape not only immediately after assembly of the device but also after repeated charge and discharge. Moreover, when a battery deform | transforms, the problem that the bias of charging / discharging reaction arises and it cannot fully exhibit a battery characteristic tends to arise.

  Patent Document 1 discloses a configuration in which struts are arranged in a battery case in order to maintain the shape of the battery. According to this configuration, the shape of the thin battery can be maintained against the increase in the internal pressure of the battery, which is a cause of deformation of the battery.

JP-A-6-150893

  In a device in which a large-sized thin battery is installed, the layout design of other parts is important in addition to the shape stability of the battery. When a large thin battery is placed inside a device, the space around the battery in the device is divided into two by the battery. Therefore, it is an important design matter which other part is arranged in the divided space. When electrical wiring between electronic parts and optical wiring between optical parts are applied between electronic parts and optical parts arranged in different spaces divided by a battery, there is a concern that the wiring distance becomes very long. . A long wiring distance becomes a high cost factor and a performance degradation factor. In particular, due to physical restrictions when using a large-sized thin battery such as a decrease in S / N due to signal attenuation and the influence of stray capacitance in a high-frequency circuit, the arrangement of components affects the performance of electronic devices more than ever.

  Therefore, in view of the above-mentioned conventional problems, the present invention is excellent in shape stability, and when installed in a device, the electrical wiring and optical wiring that cause a decrease in the performance of the device. An object of the present invention is to provide a plate-like secondary battery capable of reducing redundancy. Another object of the present invention is to provide an electronic device system using such a plate-like secondary battery.

The plate-like secondary battery of the present invention is
A flat electrode group;
Electrolyte,
A plate-like case that houses the electrode group and the electrolyte;
A support column arranged to penetrate the electrode group in the thickness direction, and both ends of the support column are respectively joined to both main surfaces of the case, thereby restricting deformation of the two main surfaces of the case Said prop to
With
The electrode group is formed by laminating or winding a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate,
The support column has a tubular shape, and both main surfaces of the case are provided with openings that communicate with the hollow portion of the support column,
The hollow portion of the support column and the opening of the case form a through hole that penetrates the case in the thickness direction and is isolated from the space in which the electrode group and the electrolyte are stored. Has been.

The present invention also provides
The plate-like secondary battery of the present invention,
At least one selected from an electric circuit, an optical circuit, and a display; and
With
At least one selected from at least part of the electric circuit, at least part of the optical circuit, and the display is disposed inside the through hole formed in the plate-shaped secondary battery. Yes,
An electronic equipment system is also provided.

  The plate-shaped secondary battery of the present invention can realize excellent shape stability by providing a support column that restricts deformation of the case. Furthermore, the plate-shaped secondary battery of the present invention can utilize the through hole provided through the case in the thickness direction in order to arrange other components. As a result, when the plate-shaped secondary battery of the present invention is installed inside a device, even if the space around the battery in the device is divided by the battery, factors such as performance degradation of the device Therefore, it is possible to arrange components (optimal component arrangement excluding space restrictions) that reduce redundancy of electrical wiring and optical wiring.

  The electronic device system according to the present invention can be used for an electric circuit, an optical circuit, and / or a display by using a through-hole provided in the secondary battery even if the plate-shaped secondary battery to be installed is large. Optimal component placement that eliminates space constraints can be realized. Furthermore, since the electronic device system of the present invention includes a plate-like secondary battery having excellent shape stability, the characteristics of the secondary battery can be maximized.

(A) And (b) is a perspective view which shows typically the example of the square battery which is one Embodiment of the plate-shaped secondary battery of this invention. (A) And (b) is a perspective view which shows typically the example of the laminated battery which is another embodiment of the plate-shaped secondary battery of this invention. It is sectional drawing which shows a support | pillar and its vicinity among the II line | wire cross sections of Fig.1 (a). It is sectional drawing which shows a support | pillar and its vicinity among the II-II line cross sections of FIG.1 (b). It is sectional drawing which shows the state by which the electrical wiring which comprises an electric circuit is arrange | positioned inside the through-hole of the plate-shaped secondary battery shown by FIG. It is sectional drawing which shows the state by which the optical wiring which comprises an optical circuit is arrange | positioned inside the through-hole of the plate-shaped secondary battery shown by FIG. It is sectional drawing which shows the state by which the indicator is arrange | positioned inside the through-hole of the plate-shaped secondary battery shown by FIG. It is sectional drawing which shows the state with which the inside of the through-hole of the plate-shaped secondary battery shown by FIG. 5 is filled with the filler.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiment is an example of the present invention, and the present invention is not limited to the following embodiment. Moreover, in the following embodiment, the same code | symbol may be attached | subjected to the same member and the overlapping description may be abbreviate | omitted.

  Embodiments of the plate-like secondary battery of the present invention will be described below.

  1A and 1B are perspective views schematically showing an example of a prismatic battery which is an embodiment of the plate-like secondary battery of the present invention. Each of these secondary batteries is formed by housing a flat electrode group (not shown) and an electrolyte (not shown) in a plate-like battery case 1. In the electrode group, a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate are laminated (laminated type) or rolled into a flat shape (捲It is formed by a revolving mold). The battery case 1 is formed by connecting the two extraction electrodes 2 electrically connected to the positive electrode plate and the negative electrode plate inside the battery case 1 to a sealing plate (not shown) having an insulating packing disposed on the periphery. 1 is arranged. It is also possible to use a metal case as the battery case 1 and substitute one of the extraction electrodes 2 with the metal case. As will be described in detail later, the secondary battery of the present embodiment is provided with one or more support columns 3 arranged so as to penetrate the electrode group in the thickness direction. The both ends of the column are joined to both main surfaces 4 of the battery case 1. As shown in FIG. 3, in the secondary battery of this embodiment, both ends of the support column 3 are inside the battery case 1, that is, both ends of the support column 3 are respectively joined to the inner walls of both main surfaces 4 of the battery case 1. You may have the structure which has. As another example, in the secondary battery of this embodiment, as shown in FIG. 4, both ends of the column 3 are exposed on the outer surface of the battery case 1, that is, both ends of the column 3 are of the battery case 1. You may have the structure joined with the outer wall of both the main surfaces 4, respectively.

  2 (a) and 2 (b) are perspective views schematically showing an example of a laminated battery which is another embodiment of the plate-like secondary battery of the present invention. Similar to the prismatic battery shown in FIGS. 1A and 1B, a wound or stacked electrode group (not shown) and an electrolyte (not shown) are included in the battery case 1. It is formed by being housed in. The two extraction electrodes 2 electrically connected to the positive electrode plate and the negative electrode plate in the battery case 1 may have a configuration protruding from the battery case 1 (FIG. 2A), or the battery case 1. You may have the structure arrange | positioned on the surface of (FIG.2 (b)).

  The external shape of the secondary battery schematically shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 (a) and 2 (b) is an example, and the external shape of the secondary battery of the present invention. Is not limited to these.

  Next, the internal configuration of the battery will be described in more detail with reference to FIGS. FIG. 3 is a diagram showing the column 3 and its vicinity in the cross section taken along the line I-I of FIG. 1A, and shows the cross-sectional structure of the prismatic battery shown in FIG. Note that FIG. 3 also shows one strut 3 and its vicinity in the section taken along the line III-III in FIG. 2A, and one strut 3 and its vicinity in the section taken along the line IV-IV in FIG. The cross-sectional structure is almost the same. FIG. 4 is a diagram showing the column 3 and its vicinity in the cross section taken along the line II-II in FIG. 1B, and shows the cross-sectional structure of the prismatic battery shown in FIG.

  As shown in FIGS. 3 and 4, the flat electrode group 11 includes a strip-shaped first electrode plate 12, a strip-shaped second electrode plate 13, and a strip-shaped separator 14 disposed therebetween. It is formed by being laminated or wound in a flat shape. The first electrode 12 and the second electrode 13 are disposed to face each other with a separator 14 interposed therebetween. The strip-shaped separator 14 is preferably wider than the strip-shaped first electrode 12 and the strip-shaped second electrode 13 in order to ensure insulation between the first electrode 12 and the second electrode 13. The first electrode 12 and the second electrode 13 are formed by providing an active material layer (not shown) on a first current collector and a second current collector (not shown), respectively. One of the first electrode 12 and the second electrode 13 is a positive electrode plate, and the other is a negative electrode plate.

  As shown in FIGS. 3 and 4, the support column 3 is disposed so as to penetrate the flat electrode group 11 in the thickness direction. Both ends of the support column 3 are joined to both main surfaces 4 of the battery case 1, respectively. The support column 3 has a tube shape. Both main surfaces 4 of the battery case 1 are provided with openings 4 a communicating with the hollow portions of the support columns 3. A through hole 5 that penetrates the battery case 1 in the thickness direction is formed by the hollow portion of the column 3 and the opening 4 a of the battery case 1. The end portion of the support column 3 and the main surface 4 of the battery case 1 are separated from the space in which the through hole 5 is stored in the electrode group 11 of the battery case 1 and the electrolyte, that is, the electrolyte passes through the through hole 5. Are joined together so as not to leak out of the battery case 1. As shown in FIG. 3, the end of the column 3 and the main surface 4 of the battery case 1 may be bonded to each other on the inner surface of the main surface 4 of the battery case 1 (inner surface bonding). As shown in FIG. 4, the outer surface of the main surface 4 of the battery case 1 may be bonded (outer surface bonding). Here, the main surface of the battery case 1 refers to two surfaces in the plate-shaped battery case 1 that are in contact with the electrolyte and that form the front and back surfaces of a thin secondary battery or a surface equivalent thereto. Therefore, the printed seal and the exterior film are not necessarily included in the battery case referred to in the present invention. In order to increase the bonding strength between the support column 3 and the main surface 4 of the battery case 1, it is also effective to increase the cross-sectional area of both ends of the support column 3. In comparison between the inner surface bonding and the outer surface bonding, the outer surface bonding is easier to realize the shape maintenance against the expansion force of the battery. Furthermore, in the case of outer surface joining, the entire wall surface constituting the through hole 5 is formed by the inner wall of the column 3. On the other hand, in the case of inner surface bonding, the wall surface constituting the through hole 5 is formed by the inner wall of the column 3 and the wall surface constituting the opening 4 a of the battery case 1. That is, in the case of the inner surface bonding, the bonding portion between the support column 3 and the main surface 4 of the battery case 1 exists on the wall surface constituting the through hole 5. For this reason, the outer surface bonding is preferable also in that the sealing property can be secured.

  Various methods such as a method using an adhesive and a method of welding can be used as a method for joining the support column 3 and the battery case 1. By joining the support column 3 and the battery case 1, the distance between both main surfaces 4 of the battery case 1 is kept constant at the joint portion with the support column 3.

  In the secondary battery, gas generation due to expansion of the electrode plate, decomposition of the electrolyte, and the like occurs due to repeated charging and discharging. As a result, the internal pressure of the secondary battery increases. Due to this increase in internal pressure, an expansion force that causes the battery case 1 to expand in the thickness direction acts on the main surface 4 of the battery case 1. At this time, the support column 3 functions to limit deformation of the main surface 4 of the battery case 1 in the thickness direction of the battery case 1 against the expansion force. Since the distance between the main surfaces 4 is kept constant at the joint portion with the support column 3, even if some deformation occurs on the main surface 4 of the battery case 1 other than the joint portion with the support column 3, the battery case 1. When the two main surfaces 4 are viewed as a whole, deformation of both main surfaces is limited to a small range. That is, by providing the support columns 3, it is possible to suppress the shape change of the thin secondary battery as a whole. Moreover, it is preferable to adjust the number of the support | pillars 3 and its arrangement position suitably so that the deformation | transformation of both the main surfaces in the battery case 1 may be suppressed more effectively.

  The through hole 5 can be used for arrangement of other components when the secondary battery of the present embodiment is installed inside the device. As described above, the electrolyte does not leak into the through hole 5 and the electrode group 11 is not exposed. Therefore, various components can be arranged inside the through hole 5 without impairing safety. In the device in which the secondary battery according to the present embodiment is installed, even when the space around the battery is divided by the battery, the optimal component arrangement that eliminates the space restriction by using the through hole 5 Is possible. As a result, redundancy of electrical wiring, optical wiring, and the like can be reduced, so that it is possible to avoid occurrence of degradation in device performance due to component placement.

  The outer surface of the column 3 is preferably insulative. Thereby, the short circuit by the contact with the support | pillar 3 and the electrode group 11 can be prevented. Furthermore, the inner surface of the support column 3, that is, the inner wall of the tube is also preferably insulative. Thereby, the restriction | limiting of the components arrange | positioned inside the through-hole 5 is eased. For these reasons, the support column 3 is preferably formed of a resin material or the like.

  In addition, the components arrange | positioned inside the through-hole 5 can be suitably selected by the user according to the apparatus with which the secondary battery of this embodiment is applied. For example, as shown in FIG. 5, the electrical wiring 6 constituting the electrical circuit can be arranged inside the through hole 5. In FIG. 5, the electric wiring 6 is shown. However, the present invention is not limited to this, and at least one kind of component selected from components that can be components of the electric circuit is arranged in the through hole 5. it can. Examples of such components include resistors, coils, capacitors, switches, lamps and integrated circuits.

  As shown in FIG. 6, the optical fiber 7 constituting the optical circuit can be arranged inside the through hole 5. Although the optical fiber 7 is shown in FIG. 6, the present invention is not limited to this, and at least one kind of component selected from components that can be components of the optical circuit can be arranged inside the through hole 5. . Examples of such components include a projector, a light receiver, an optical splitter, a switch, a lens, and an optical integrated circuit.

  As shown in FIG. 7, the indicator 8 can be arranged inside the through hole 5. In this case, it is possible to install the indicator 8 having the display panel unit 9 inside the through-hole 5 and pull out the wiring unit 10 from the back surface of the display panel unit 9. The specific indicator 8 is not particularly limited. For example, a liquid crystal panel, an LED display, various displays, and the like can be disposed inside the through hole 5.

  It is also possible to fill the filler 21 in the space portion of the through hole 5 in which the component constituting the electric circuit, the component constituting the optical circuit, and / or the indicator is arranged. FIG. 8 shows an example in which the electrical wiring 6 is disposed in the through hole 5 and the space is filled with the filler 21. The components constituting the electric circuit, the components constituting the optical circuit, and / or the indicator are arranged in the through hole 5, and the remaining space of the through hole 5 is filled with the filler 21, thereby fixing the component and the indicator. Therefore, the reliability of the equipment and the reliability of the wiring life and the like are improved. For example, an epoxy resin, an acrylic resin, a vinyl resin, various rubbers, and heat-dissipating grease can be used as the material of the filler 21, but the filler 21 is not limited to these materials.

  In addition, as a modification of the secondary battery according to the present embodiment, the secondary battery is provided with at least one kind of component selected from components that can be a component of the electric circuit disposed inside the through hole 5 as a component. Can also be realized. That is, when FIG. 5 is used as a diagram illustrating this modification, a battery in which the electrical wiring 6 is disposed inside the through hole 5 can be used as the secondary battery of this embodiment.

  Similarly, as another modified example of the secondary battery of the present embodiment, at least one type of component selected from components that can be a component of an optical circuit disposed inside the through hole 5 is used as a component. It can also be realized. That is, when FIG. 6 is used as a diagram illustrating this modification, a battery in which the optical fiber 7 is disposed inside the through hole 5 can be used as the secondary battery of the present embodiment.

  Similarly, as another modification of the secondary battery of the present embodiment, a battery provided with a display device disposed inside the through hole 5 as a constituent element can be realized. That is, when FIG. 7 is used as a diagram illustrating this modification, a battery in which the indicator 8 is disposed inside the through hole 5 can be used as the secondary battery of this embodiment.

  Next, materials used, manufacturing methods, and the like will be described more specifically with respect to each component constituting the secondary battery of the present embodiment.

  First, the positive electrode plate and the negative electrode plate constituting the electrode group 11 will be described. When the secondary battery of the present embodiment is a lithium ion secondary battery, the active material contained in the positive electrode active material layer constituting the positive electrode plate and the negative electrode active material layer constituting the negative electrode plate reacts electrochemically with lithium. There is no particular limitation as long as it does.

When the secondary battery of this embodiment is a lithium ion secondary battery, it is preferable that a positive electrode active material contains a transition metal oxide, for example. For example, lithium-containing transition metal oxides such as lithium cobaltate (LiCoO ₂ ), lithium nickelate (LiNiO ₂ ), and lithium manganate (LiMn ₂ O ₄ ) can be used, but not limited thereto. An example of the method for producing the positive electrode active material is as follows. First, for example, 100 parts by weight of lithium cobalt oxide (LiCoO ₂ ) powder having an average particle size of about 10 μm, 3 parts by weight of acetylene black as a conductive agent, and 8 parts by weight of polyvinylidene fluoride powder as a binder, An appropriate amount of N-methyl-2-pyrrolidone (NMP) is thoroughly mixed to prepare a positive electrode mixture paste. Next, the obtained paste is applied onto a positive electrode current collector made of a long aluminum foil having a thickness of 20 μm, dried and then rolled to form a positive electrode active material layer. Thereby, the positive electrode plate by which the positive electrode active material layer is arrange | positioned on the positive electrode collector is obtained.

  When the secondary battery of this embodiment is a lithium ion secondary battery, the negative electrode active material may be, for example, graphite that is widely used in lithium ion secondary batteries. In addition, a silicon simple substance, a silicon alloy, a compound containing silicon and oxygen, a compound containing silicon and nitrogen, a tin simple substance, a tin alloy, a compound containing tin and oxygen, and tin and nitrogen can be expected. At least any one selected from the group consisting of compounds may be included. In addition, these are examples of a negative electrode active material, and are not limited to this. An example of the method for producing the negative electrode active material is as follows. For example, in an atmosphere in which oxygen is introduced into a vacuum chamber evacuated to high vacuum, silicon as an active material source is evaporated by -30 kV electron beam heating, and the generated silicon vapor is produced from a long copper foil having a thickness of 20 μm. Oxygen reactive deposition is performed on the negative electrode current collector. Thereby, the negative electrode plate by which the negative electrode active material layer is arrange | positioned on the negative electrode collector is obtained.

  The positive electrode active material layer and the negative electrode active material layer may be formed by applying a mixture containing an active material and a binder on a current collector, or by a thin film process such as a vapor deposition method, a sputtering method, or a CVD method. The active material may be formed on the current collector.

  The thickness of the active material layer varies depending on the performance of the battery to be manufactured, but is approximately in the range of 3 to 40 μm, for example. When the thickness of the active material layer is less than 3 μm, the proportion of the active material in the entire battery is reduced, and the energy density of the battery may be reduced. On the other hand, when the thickness of the active material layer exceeds 300 μm, there may be a case where a large current characteristic is deteriorated due to an increase in electrode plate resistance and a current collector is deformed.

  For the current collector of the positive electrode plate, for example, a metal foil containing aluminum, nickel and / or titanium can be used. For the current collector of the negative electrode plate, for example, a metal foil containing copper and / or nickel can be used. When the electrode group 11 is a wound type, the metal foil is preferably a long sheet. In light of the strength of the current collector, the volumetric efficiency of the battery, the ease of handling of the current collector, and the like, the thickness of the metal foil is preferably 4 to 40 μm, and more preferably 5 to 20 μm. The surface of the metal foil may be smooth, but irregularities with a surface roughness Ra of about 0.1 to 4 μm may be provided in order to increase the adhesion strength with the active material layer. The unevenness provided in the metal foil may have an effect of forming voids between the columnar particles included in the active material layer. From the viewpoints of adhesion to the active material layer, cost, and the like, a metal foil having a surface roughness Ra = 0.4 to 2.5 may be used.

  A general method for manufacturing the electrode group 11 will be described. When the electrode group 11 is a wound type, a roll-shaped positive electrode plate, a roll-shaped negative electrode plate, and two roll-shaped separators are usually used. A separator unwound from one roll is interposed between the positive electrode plate and the negative electrode plate, and a separator unwound from the other roll is arranged outside the positive electrode plate or the negative electrode plate, for a total of 4 Wind the layers simultaneously. In order to obtain a flat wound body, either a method of crushing a cylinder or an elliptical cylinder, or a method of flattening from the beginning can be used. Further, when the electrode group 11 is a laminated type, the electrode group 11 is formed by a method in which sheet-like positive plates and sheet-like negative plates are alternately laminated via a sheet-like separator therebetween. Can do.

  It is necessary to provide a hole penetrating in the thickness direction in the electrode group 11 at a position corresponding to the position where the column 3 is disposed. When the electrode group 11 is a wound type, for example, holes are provided in advance in the positive electrode plate, the negative electrode plate, and the separator before winding. This hole needs to be provided so that a through hole is formed at a predetermined position in a wound state. Since the thickness increases as the number of windings increases, if holes are provided at equal intervals in the length direction on the positive electrode plate or the like, the positions of the holes will be displaced in the wound state. Therefore, it is necessary to provide a hole at an appropriate position in consideration of an increase in thickness accompanying an increase in the number of wrinkles. In order to prevent a short circuit at the portion of the through hole provided in the electrode group 11, it is preferable to design the size of the hole provided in the separator smaller than the size of the hole provided in the positive electrode plate and the negative electrode plate.

  In the case where the electrode group 11 is a laminated type, for example, the electrode group 11 is thickened by sequentially laminating a positive electrode plate, a negative electrode plate, and a separator that are previously provided with holes at positions corresponding to the positions where the support columns 3 are arranged. A hole penetrating in the vertical direction can be formed. Also in this case, in order to prevent a short circuit in the through hole portion, it is preferable to design the size of the hole provided in the separator smaller than the size of the hole provided in the positive electrode plate and the negative electrode plate.

  A separator is not specifically limited, The material currently used for the separator of the battery of various forms can be used arbitrarily. As the separator, for example, a microporous film made of polyethylene or polyolefin can be used.

  The positive electrode lead and the negative electrode lead are preferably connected to the positive electrode plate and the negative electrode plate, respectively, before constituting the electrode group 11. The positive electrode lead and the negative electrode lead are connected to the positive electrode plate and the negative electrode plate through a thermal spray layer formed on the end face of the electrode group 11 as necessary. The obtained electrode group 11 is inserted into a predetermined plate-shaped battery case 1, and predetermined terminals are taken out of the battery case from the positive electrode lead and the negative electrode lead. Thereafter, an electrolyte is injected into the battery case 1. By making the inside of the battery case 1 in a vacuum state, the electrode group 11 is easily impregnated with the electrolyte.

  The battery case 1 can be formed of, for example, a thin square metal battery can. In addition, an envelope-like laminate bag made of a laminate sheet containing aluminum foil can also be used. In particular, when the battery case 1 is large and thin, it is often advantageous in processing to form the battery case with a laminate sheet. The main surface 4 of the battery case 1 is provided with an opening 4 a communicating with the hollow portion at a position corresponding to the hollow portion of the support column 3. The opening 4a may be provided in advance before the support 3 is installed in the battery case, or may be provided after the support 3 is installed in the battery case.

  The method for installing the support column 3 in the battery case 1 is not particularly limited. For example, before the electrode group 11 is installed in the battery case 1, the support column 3 is previously installed in a through hole provided in the electrode group 11, and the electrode group 11 is placed in the battery case 1 in that state. May be installed in the battery case 1. In this case, an adhesive is applied to both ends of the support column 3 and / or corresponding portions of the battery case 1, and when the electrode group 11 is installed in the battery case 1, the support column 3 and the main surface 4 of the battery case 1 are connected. A joining method may be used. Moreover, after installing the electrode group 11 in the battery case 1, a corresponding portion of the support 3 in the battery case 1 is heated from the outer surface of the case, and the end of the support 3 and the main surface of the battery case 1 are joined by welding. Can also be used. Further, after the electrode group 11 is inserted into the battery case 1, the column 3 is inserted from the outside of the battery case 1 by aligning the positions of the holes provided in the battery case 1 and the through holes provided in the electrode group 11 in advance. Then, the support post 3 and the battery case 1 may be joined.

  As the electrolyte, for example, various lithium ion conductive solid electrolytes and non-aqueous electrolytes are used. The non-aqueous electrolyte is not particularly limited, but a non-aqueous electrolyte in which a lithium salt is dissolved is preferably used. The concentration of the lithium salt in the non-aqueous electrolyte is preferably 0.5 mol / L or more and 2 mol / L or less.

  As the non-aqueous solvent, for example, cyclic carbonates such as ethylene carbonate and propylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate are preferably used. A mixed solvent of cyclic carbonates and chain carbonates is generally used. You may mix (gamma) -butyrolactone, dimethoxyethane, etc. with a nonaqueous solvent. However, the composition of the non-aqueous electrolyte is not particularly limited.

Examples of the lithium salt include lithium hexafluorophosphate, lithium tetrafluoroborate, and imide-lithium salt. Especially, the non-aqueous electrolyte containing lithium hexafluorophosphate as the main component has better battery characteristics than the non-aqueous electrolyte containing other lithium salts as the main component. It is preferable to add a small amount of lithium tetrafluoroborate or imide-lithium salt in combination with lithium hexafluorophosphate. As an example, a solution obtained by dissolving LiPF ₆ at a concentration of 1 mol / L in a mixed solvent of ethylene carbonate and diethyl carbonate in a volume ratio of 1: 1 can be used.

  Finally, the secondary battery of the present embodiment is completed by sealing the electrode group 11 and the battery case 1.

  An embodiment of an electronic device system of the present invention will be described. The electronic device system of the present embodiment includes the plate-like secondary battery of the present embodiment and at least one selected from an electric circuit, an optical circuit, and a display. At least one selected from at least a part of the electric circuit, at least a part of the optical circuit, and the display is disposed inside a through hole formed in the plate-shaped secondary battery. . 5 to 7 can be used as diagrams illustrating a part of the electronic device system of the present embodiment. For example, FIG. 5 includes the plate battery of the present embodiment and an electric circuit in which the electric wiring 6 as a part thereof is disposed in the through hole 5 formed in the plate battery. 1 shows an electronic device system. FIG. 6 shows an electronic device system including the plate-like battery of the present embodiment and an optical circuit in which an optical fiber 7 as a part thereof is disposed in a through-hole 5 formed in the plate-like battery. Is shown. FIG. 7 shows an electronic device system including the plate battery of the present embodiment and a display device arranged inside the through hole 5 formed in the plate battery. The electronic device system of this embodiment uses the through holes provided in the secondary battery for the arrangement of the electric circuit, the optical circuit, and the display. Therefore, even if the installed secondary battery is large, it is possible to realize an optimal component arrangement that eliminates space restrictions for the electric circuit, optical circuit, and display. Furthermore, since the electronic device system of this embodiment includes the secondary battery provided with the support columns 3, the shape stability of the secondary battery can be maintained and its characteristics can be maximized.

  Although specific configurations have been described above as modes for carrying out the present invention, the present invention is not limited to these. The plate-like secondary battery here is not limited to a two-dimensional planar plate-like secondary battery, but also includes a curved plate-like secondary battery. For example, it is obvious that the configuration of the secondary battery specified in the present invention can be applied to various curved surface shapes such as a cylindrical shape, a tile shape, and a conical side surface shape. Further, as a specific application example, the embodiment has been described centering on a lithium ion secondary battery, but the present invention is not limited to this. The configuration of the secondary battery specified in the present invention is effective for maintaining a thin shape through repeated charge and discharge even in a plate-like secondary battery other than the lithium ion secondary battery.

  The plate-like secondary battery of the present invention can maintain a thin shape even after repeated charging and discharging, and further has a component arrangement that reduces redundancy of electrical wiring and optical wiring when installed in equipment. Make it possible. Therefore, the plate-like secondary battery of the present invention can be suitably used as a large-sized battery built in a high-performance electronic device and a thin electronic device. In addition, the electronic device system of the present invention can maximize the characteristics of the secondary battery, and also enables optimal component placement that eliminates space constraints. Therefore, the electronic device system of the present invention can be suitably used as a system for high-performance electronic devices and thin electronic devices.

DESCRIPTION OF SYMBOLS 1 Battery case 2 Extraction electrode 3 Support | pillar 4 Main surface of battery case 4a Opening part 5 Through-hole 6 Electrical wiring 7 Optical fiber 8 Indicator 9 Display panel part 9
DESCRIPTION OF SYMBOLS 10 Wiring part 11 Electrode group 12 1st electrode (positive electrode plate or negative electrode plate)
13 Second electrode (negative electrode plate or positive electrode plate)
14 Separator 21 Filler

Claims (8)

A flat electrode group;
Electrolyte,
A plate-like case that houses the electrode group and the electrolyte;
A support column arranged to penetrate the electrode group in the thickness direction, and both ends of the support column are respectively joined to both main surfaces of the case, thereby restricting deformation of the two main surfaces of the case Said prop to
With
The electrode group is formed by laminating or winding a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate,
The support column has a tubular shape, and both main surfaces of the case are provided with openings that communicate with the hollow portion of the support column,
The hollow portion of the support column and the opening of the case form a through hole that penetrates the case in the thickness direction and is isolated from the space in which the electrode group and the electrolyte are stored. Being
Plate-like secondary battery. It further comprises at least any one component selected from components that can be components of an electric circuit disposed inside the through hole.
The plate-shaped secondary battery according to claim 1. It further includes at least any one component selected from components that can be components of an optical circuit disposed inside the through hole.
The plate-shaped secondary battery according to claim 1. Further comprising an indicator disposed inside the through-hole,
The plate-shaped secondary battery according to claim 1. The inside of the through hole is filled with a filler,
The plate-shaped secondary battery according to any one of claims 1 to 4. The column is formed of a resin material,
The plate-shaped secondary battery according to any one of claims 1 to 5. The plate-like secondary battery according to claim 1;
At least one selected from an electric circuit, an optical circuit, and a display; and
With
At least one selected from at least a part of the electric circuit, at least a part of the optical circuit, and the display is disposed in the through hole formed in the plate-shaped secondary battery. ,
Electronic equipment system. The inside of the through hole is filled with a filler,
The electronic device system according to claim 7.

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