electronic machines

Abstract

Wearable devices need to be designed to conform to the complex surface of the human body. Therefore, after purchase, it can be adjusted to the individual's physical characteristics and worn naturally without any discomfort. Provide the container. [Solution] An electronic device equipped with a deformable secondary battery. By using this, for example, secondary batteries can be efficiently installed in narrow, elongated spaces within electronic devices. Furthermore, it becomes possible to bend electronic devices along with their elongated secondary batteries. This makes it easier to adjust the weight balance.

Description

[Technical Field]

[0001] One aspect of the present invention relates to a product, a method, or a method of manufacture. Alternatively, the present invention relates to a process. This relates to machines, manufacturers, or compositions of matter. One aspect of the present invention relates to semiconductor devices, display devices, light-emitting devices, energy storage devices, lighting devices, or electronic devices. The present invention relates to devices or methods for manufacturing them, particularly electronic devices and their operating systems. Regarding Tem.

[0002] In this specification, "electronic device" refers to all devices that have a secondary battery. Electro-optical devices and information terminal devices with secondary batteries are all electronic devices. [Background technology]

[0003] Electronic devices that users carry with them and electronic devices that users wear are being actively developed. For example, For example, a thin, portable book is described in Patent Document 1.

[0004] Electronic devices carried by users or worn by users are primarily powered by rechargeable batteries. It works. Electronic devices carried by users are intended for long-term use, therefore A large-capacity rechargeable battery can be used for this purpose. However, to incorporate a large-capacity rechargeable battery into an electronic device... However, large-capacity rechargeable batteries are large and heavy, which makes electronic devices large and heavy. There is a problem. Therefore, a small or thin, high-capacity secondary system that can be built into a portable electronic device is needed. Battery development is progressing.

[0005] Patent Document 1 describes a sheet-like energy storage device that can be curved or bent in at least one axial direction. It is described there. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2013-211262 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Electronic devices are becoming increasingly diverse, with manufacturers proposing various designs and forms. In the case of small electronic devices with complex external shapes, a secondary battery may be built-in or mounted. There are space limitations for doing so. In the limited space, existing coin-type lithium-ion secondary batteries When trying to place ponds, the number of locations and the number of ponds that can be placed are likely to be limited. Also, if Even if you arrange several small coin-type rechargeable batteries, the connections between the batteries become complicated, This also results in wasted space, so it cannot be considered efficient.

[0008] Thus, manufacturers take into account the space for placing the secondary battery in advance when designing their products. Because design considerations such as shape need to be taken into account, the product design is limited by the shape and location of the secondary battery. It is limited.

[0009] However, in the case of wearable devices, for example, the design must be adapted to the complex surface of the human body. It is necessary to have a surface that conforms to the curve of the arm. Specifically, in the case of a device worn on the arm, it is necessary to have a surface that conforms to the curve of the arm. The device should have a design that allows for deformation, and it is desirable that it be comfortable to use. Having a balanced weight distribution is also important.

[0010] Especially with wearable devices, they can be customized to individual body characteristics after purchase, ensuring a comfortable fit. It is preferable to have something that can be worn naturally.

[0011] Specifically, for example, in the case of glasses-type devices, the distance between human eyes, i.e., the interpupillary distance, is approximately 50 The size ranges from a few millimeters to approximately 80 mm. Furthermore, the position of the nose and ears varies from person to person. Wearing an ill-fitting device can make it difficult to see, and the device may shift when the user moves. This can lead to problems such as marks being left on the nose due to the weight applied to it.

[0012] Therefore, we will provide electronic devices with novel structures. Specifically, we will make them available in various external shapes. To provide an electronic device with a novel structure that enables this.

[0013] Alternatively, one aspect of the present invention aims to provide a novel energy storage device, a novel secondary battery, and the like. This is the case. Furthermore, the description of these issues does not preclude the existence of other issues. One aspect of the invention does not necessarily have to solve all of these problems. External issues will naturally become clear from the descriptions in the specification, drawings, claims, etc. It is possible to extract other issues from the descriptions in the detailed specifications, drawings, and claims. [Means for solving the problem]

[0014] Therefore, in one aspect of the present invention, an electronic device is provided that is equipped with a deformable secondary battery. By using a capable rechargeable battery, for example, it is possible to efficiently supply power to narrow and elongated spaces within electronic devices. A pond will be installed, and the long, slender rechargeable battery will be able to be bent along with the electronic device. It also makes it easier to adjust the weight balance of electronic devices.

[0015] Therefore, the part that is positioned along the side of the wearer's head when worn (also called the temple) has a long, narrow shape. Install a rechargeable battery and make it so that part of it can be bent. [Effects of the Invention]

[0016] We can provide electronic devices equipped with a rechargeable battery that can be deformed. It allows for the efficient installation of secondary batteries in space. It also enables the development of flexible electronic devices. It can be provided. Furthermore, it can be tailored to the individual's physical characteristics and worn naturally without discomfort. We can provide wearable devices. We also offer electronic devices with a comfortable weight balance. We can provide the equipment.

[0017] Furthermore, we can provide novel electronic devices or novel energy storage devices. The description of the effect does not preclude the existence of other effects. Furthermore, one aspect of the present invention is not necessarily However, it is not necessary to have all of these effects. Other effects are described in the specification and figures. This will become clear from the descriptions of the surfaces, claims, etc., and will be evident from the specifications, drawings, claims, etc. From the description, it is possible to extract effects other than those listed above. [Brief explanation of the drawing]

[0018] [Figure 1] This is a top view and a perspective view showing one aspect of the present invention. [Figure 2] These are a cross-sectional view, a top view, and a perspective view showing a secondary battery that can be used in one embodiment of the present invention. [Figure 3] This is a perspective view showing a secondary battery that can be used in one aspect of the present invention and a method for manufacturing the same. [Figure 4] This is a cross-sectional view showing a secondary battery that can be used in one aspect of the present invention. [Figure 5] This is a perspective view showing a method for manufacturing a secondary battery that can be used in one aspect of the present invention. [Figure 6]These are a cross-sectional view and a top view illustrating a method for manufacturing a secondary battery that can be used in one aspect of the present invention. [Figure 7] These are a top view and a perspective view illustrating a method for manufacturing a secondary battery that can be used in one embodiment of the present invention. [Figure 8] This figure shows another example of one aspect of the present invention. [Figure 9] This is a block diagram illustrating a wireless system that can be used in one aspect of the present invention. [Figure 10] This is a design drawing of the secondary battery fabricated in Example 1. [Figure 11] These are photographs of the secondary battery and electronic device fabricated in Example 1. [Figure 12] These are photographs of the secondary battery and electronic device fabricated in Example 1. [Figure 13] This is an X-ray CT image of the secondary battery prepared in Example 1. [Figure 14] This is a diagram illustrating the charge-discharge test. [Figure 15] This is a diagram illustrating the charge-discharge test. [Figure 16] This is a diagram illustrating the charge-discharge test. [Figure 17] This shows the charge and discharge characteristics of the secondary battery evaluated in Example 2. [Modes for carrying out the invention]

[0019] The embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is... Not limited to the following description, the form and details can be modified in various ways, as any person skilled in the art would know. This is easily understood. Furthermore, the present invention shall be interpreted as being limited to the contents of the embodiments described below. It's not something that can be done.

[0020] "Electrically connected" means connected via "something that has some kind of electrical effect". This includes connections. Here, "something that has some kind of electrical effect" refers to electrical signals between connected objects. There are no particular restrictions as long as it allows for the transfer of numbers.

[0021] The location, size, and extent of each component shown in the drawings, etc., are for the purpose of facilitating understanding. The location, size, and range may not be described. Therefore, the disclosed invention is not always Furthermore, it is not limited to the location, size, scope, etc., disclosed in drawings, etc.

[0022] Ordinal numbers such as "1st," "2nd," and "3rd" are added to avoid confusion of constituent elements. That is the case.

[0023] (Embodiment 1) In this embodiment, an example of an electronic device according to one aspect of the present invention will be described using Figure 1. ru.

[0024] Figure 1(A) is a top view of a spectacle-type device 100 according to one aspect of the present invention, and Figure 1(B) This is a perspective view of the glasses-type device 100.

[0025] The eyeglass-type device 100 has a portion that is positioned along the side of the user's head when worn (hereinafter referred to as the "temple"). It has a (referred to as) temple section, and each of the left and right temple sections has a secondary battery 101.

[0026] A rechargeable battery is used for the secondary battery 101. Therefore, for example, the temple part is made flexible. When constructed from materials with certain properties, the shape of the temple portion can be changed. Therefore, users who purchased the glasses-type device 100 can change the shape of the temple part after purchase. By doing so, the shape of the glasses-type device 100 is adjusted to the distance between each user's eyes, the position of their nose, and the position of their ears. It can be adapted to the characteristics of the placement, etc. This allows the user to change the glasses-type device 100. It can be worn naturally without looking out of place.

[0027] Furthermore, for example, a large number of components, including a secondary battery, are arranged on the front of the glasses-type device 100. This could lead to an imbalance in the weight of the glasses-type device 100. Therefore, the temples... By placing the secondary battery 101, the glasses-type device 10 achieves a comfortable weight balance. It can be set to 0.

[0028] The spectacle-type device 100 may also have a terminal portion 104. From the terminal portion 104 to the secondary The battery 101 can be charged. Also, the secondary batteries 101 are electrically connected to each other. It is preferable that the secondary batteries 101 are electrically connected to each other, so that one terminal part Two secondary batteries 101 can be charged from 104.

[0029] The glasses-type device 100 may also have a display unit 102. The display unit 102 emits light. It may have a function. An example of a display unit 102 having a light-emitting function is one using an LED. Examples include display devices or display devices using organic EL. Also, the glasses-type device 100 is It may also have a control unit 103. The control unit 103 controls the charging and discharging of the secondary battery 101. It can also control and generate image data to be displayed on the display unit 102. By equipping the third component with a chip that has wireless communication capabilities, it becomes possible to send and receive data with the outside world. can.

[0030] Furthermore, as shown in Figure 1(C), the spectacle-type device 110 without a display unit 102 can also be used. Good. An external display unit 112 may be attached to the glasses-type device 110. By attaching an external display unit 112 to the vise 110, the user's eyes and the display unit 112 are connected. This makes it easier to adjust the distance.

[0031] Furthermore, wireless communication and wireless power supply are provided between the glasses-type device 110 and the external display unit 112. You may do so.

[0032] (Embodiment 2) In this embodiment, Figures 2, 3, 5, 6, and 7 are used to illustrate one aspect of the present invention. An example of a rechargeable battery 101 that can be used will be described. Note that all diagrams are for illustrative purposes only. Therefore, a portion of the structure is shown as an excerpt.

[0033] First, the configuration of the secondary battery 101 will be explained using Figure 2. Figure 2(A) shows the secondary battery 1 This is a perspective view of the exterior of 01. Figures 2(B), 2(C), and 2(D) are for illustrative purposes. Figure 2(B) schematically shows the structure of the secondary battery 101, and the upper part of the secondary battery 101 This is a top view. Figure 2(C) shows a cross-section of the secondary battery 101 along the dashed line XY in Figure 2(B). Figures 2(C) and 2(D) show a perspective view of the secondary battery 101. Below, we will show an excerpt of some of the components.

[0034] As shown in Figures 2(A), 2(B), and 2(C), the secondary battery 101 has multiple positive electrodes The current collector 212, multiple negative electrode current collectors 214, separator 213, outer casing 211, and outer The electrolyte 220 is contained within the region enclosed by the assembly 211. Furthermore, the positive electrode current collector 212 is electrically connected to it. Lead electrode 216a connected to the negative electrode current collector 214, and lead electrode electrically connected to the negative electrode current collector 214. It has lead electrode 216b. Also, lead electrodes 216a and 216b are partially sealed It is covered with material 217.

[0035] Furthermore, as shown in Figure 2(A), the secondary battery 101 can be made into a secondary battery with a curved structure. Yes, it is possible. That is, the secondary battery 101 has multiple positive electrode current collectors 212 and multiple negative electrode current collectors The electric body 214, the separator 213, and the outer casing 211 can each have a curved portion. By making the secondary battery 101 capable of such deformation, the electronic device that incorporates it can This allows for the creation of a deformable electronic device.

[0036] Figure 2(D) shows multiple positive electrode current collectors 212, multiple negative electrode current collectors 214, and a separator 213. This is a diagram showing an excerpt. As shown in Figure 2(D), the secondary battery 101 has multiple positive The polar current collector 212 and multiple negative polar current collectors 214 are covered by a separator 213 and bundled together. It is bound together by material 221.

[0037] In other words, the separator 213 contains multiple positive electrode current collectors 212 and the region sandwiched between multiple negative electrode current collectors 214, and multiple positive electrode current collectors 212 and multiple It has a region that is arranged to cover the negative electrode current collector 214.

[0038] To put it another way, the separator 213 of the secondary battery 101 is partially folded It is a single separator. Multiple positive electrode current collectors are placed in the folded region of separator 213. 212 and multiple negative electrode current collectors 214 are sandwiched in between.

[0039] In Figure 2(D), a binding material 221 is used to connect multiple positive electrode current collectors 212 and multiple negative electrode current collectors. The configuration for bundling the electrical components 214 is shown, but it is not limited to this. They can be bundled without using binding material. It is also possible to heat melt the separators 213 together. It can be attached. Therefore, the area is arranged to cover the current collector of separator 213. In this region, multiple separators 213 can be formed by heat welding the parts where they overlap. The positive electrode current collector 212 and multiple negative electrode current collectors 214 can be bundled together. In this case, polypropylene or polyethylene is preferred as the material for the separator.

[0040] Figures 3(A) and 3(B) show multiple positive electrode current collectors 212 formed by heat welding the separator. An example of a secondary battery 101 in which multiple negative electrode current collectors 214 are bundled together is shown. However, Figure 3(A) Figure 3(B) shows a plurality of positive electrode current collectors 212, a plurality of negative electrode current collectors 214, and a separate This is a diagram showing an excerpt of section 213b of the separator. Figure 3(A) shows a portion of the separator region 213b. The image shows a secondary battery 101 with a separator 213 heat-welded to it.

[0041] Figure 3(B) shows the separator 213, including multiple positive electrode current collectors 212 and multiple negative electrode current collectors. Remove a portion of the area covering 214, and in a portion of the separator area 213b, the separator The secondary battery 101 with 213 heat-welded is shown. Multiple positive electrode current collectors are among the separators 213. Removing a portion of the area that is positioned to cover 212 and multiple negative electrode current collectors 214. Therefore, a gap can be created in the region of the separator 213 that is used for bundling. Therefore, the gas produced when the electrolyte is decomposed by charging and discharging is released into multiple positive electrode current collectors 212, and multiple This prevents the current from remaining between the negative electrode current collector 214 and the secondary battery 101. This suppresses the bias in the battery reaction, suppresses the increase in internal resistance, and improves the capacity of the secondary battery 101. It is possible.

[0042] Also, although not shown in Figures 2 and 3 due to complexity, one or both sides of the positive electrode current collector 212 A positive electrode active material layer is formed on a portion of the surface. The positive electrode active material layer is made of at least positive electrode active material This includes the negative electrode current collector 214, and a negative electrode active material layer is formed on one or part of both sides. The negative electrode active material layer contains at least the negative electrode active material. The region where the strata are formed overlaps with the separator 213.

[0043] In Figures 2 and 3, the positive electrode current collector 212 and the negative electrode current collector 214 are stacked alternately. Although a configuration has been described, one aspect of the present invention is not limited thereto. The active material is on both sides of the current collector. The appropriate configuration differs depending on whether it is formed on both sides or on one side.

[0044] Figure 4 shows another example of a configuration in which the positive electrode current collector 212 and the negative electrode current collector 214 are stacked. vinegar.

[0045] Figure 4(A) shows five positive electrode current collectors 212, each with a positive electrode active material layer 212A formed on both sides. The configuration consists of stacking 10 negative electrode current collectors 214, each having a negative electrode active material layer 214A formed on it. As shown in the magnified view, the positive electrode active material layer 212A and the negative electrode active material layer 214A are separated. They are stacked facing each other via Ta 213. Also, the negative electrode active material layer of the negative electrode current collector 214 is shaped The layers are stacked so that the unfinished surfaces are in contact with each other.

[0046] The surfaces of the negative electrode current collector 214 that do not have a negative electrode active material layer in contact with each other are the surfaces of the negative electrode current collector 214 that do not have a negative electrode active material layer in contact with each other. The contact surface has less friction compared to the surface that the parator is in contact with. Therefore, in subsequent processes, the secondary electricity To facilitate the release of stress caused by the difference between the inner and outer diameters of the curve when pond 101 is curved. This allows for improved reliability of the secondary battery 101.

[0047] As shown in Figure 4(A), the surfaces of the negative electrode current collector 214 that do not have a negative electrode active material layer are in contact with each other. In a configuration with a curved surface, as shown in Figure 4(B), the strongly curved portion 101 of the secondary battery 101 This is particularly effective when a is close to the lead electrode 216b which is electrically connected to the negative electrode current collector 214. The effect is large. In this specification, for example, "the strongly curved portion is electrically connected to the negative electrode current collector." "Close to the lead electrodes connected to the secondary battery" means that the most curved part of the secondary battery is close to the secondary battery This refers to the point where the negative electrode current collector is closer to the lead electrode to which it is electrically connected than the midpoint of the longer side of the pond. .

[0048] Because, in the configuration shown in Figure 4(B), the curvature of the positive electrode current collector 212 is Because it occurs in a part away from the electrically connected connection, it is applied to the positive electrode current collector 212. The load, such as stress, is relatively small. In contrast, the curvature of the negative electrode current collector 214 is Because 214 occurs in a part close to the connection point where it is electrically connected, the negative electrode current collector 214 This is because the stress becomes greater. As a result, the negative electrode active material layer of the negative electrode current collector 214 is formed. Creating low-friction contact surfaces, such as surfaces that are not coated, makes it easier to release stress. This is particularly effective for that purpose.

[0049] In Figure 4, the strongly curved portion 101a is electrically connected to the negative electrode current collector 214. Although the case near electrode 216b has been described, the present invention is not limited to this. The strongly charged portion 101a is close to the lead electrode 216a which is electrically connected to the positive electrode current collector 212. In that case, a positive electrode current collector is used, in which a positive electrode active material layer is formed on one side, and the positive electrode active material layer of the positive electrode current collector It is preferable to create contact surfaces between surfaces that do not have a surface formed thereon.

[0050] Furthermore, if the strongly curved portion 101a is near both ends of the secondary battery 101, and the secondary battery If the overall curvature of 101 is strong, then the active material will form on one side of both the positive and negative electrode current collectors. It is preferable to use a current collector that is configured in this way. The surfaces of the 214 negative electrode active material layer that do not have a negative electrode active material layer formed together, and the positive electrode active material layer of the positive electrode current collector This increases the number of low-friction contact surfaces between surfaces that are not yet connected, and improves the flexibility when curved. This allows for easier release of force.

[0051] Next, the positive electrode current collector 212, negative electrode current collector 214, positive electrode active material, and separator of the secondary battery 101 Materials that can be used for the electrode 213, electrolyte 220, negative electrode active material, and outer casing 211 I will explain.

[0052] The materials used for the positive electrode current collector 212 and the negative electrode current collector 214 undergo significant chemical changes within the secondary battery. There are no special restrictions as long as it exhibits high conductivity without causing any problems. For example, gold, platinum, iron, nickel Metals such as copper, aluminum, titanium, tantalum, manganese, and their alloys ( Stainless steel can be used. Alternatively, it can be coated with carbon, nickel, titanium, etc. Good. Also, by adding silicon, neodymium, scandium, molybdenum, etc., heat resistance can be improved. It may be raised. Also, the current collector can be foil-shaped, sheet-shaped, plate-shaped, mesh-shaped, cylindrical, coil-shaped, or Various forms including condensing metal, expanded metal, porous materials, and nonwoven fabrics. The shape can be used as appropriate. Furthermore, to improve adhesion with the active material, the current collector is made surface-mounted. The surface may have fine irregularities. Furthermore, the current collector has a thickness of 5 μm to 30 μm. It's a good idea to use something.

[0053] The positive electrode active material and the negative electrode active material may be materials capable of reversible reaction with carrier ions such as lithium ions. By pulverizing, granulating, and classifying by appropriate means, the average particle size and particle size distribution of the active material can be controlled.

[0054] Examples of the positive electrode active material used in the positive electrode active material layer include composite oxides having an olivine-type crystal structure, a layered rock salt-type crystal structure, or a spinel-type crystal structure. As the positive electrode active material, for example, compounds such as LiFeO2, LiCoO2, LiNiO2, LiMn2O4, V2O5, Cr2O5 , and MnO2 are used.

[0055] Alternatively, a composite material (general formula LiMPO4 (M is one or more of Fe(II), Mn(II), Co(II), Ni(II))) can be used. Representative examples of the general formula LiMPO4 include LiFePO4, LiNiPO4, LiCoPO4, LiMnPO4, LiFe Ni b PO4, LiFe a Co b PO4, LiFe a Mn b PO4, LiNi a Co b PO4, LiNi a Mn b PO4 (a + b is 1 or less, 0 < a < 1, 0 < b < 1), LiF e c Ni d Co e PO4, LiFe c Ni d Mn e PO4, LiNi c Co d Mn e PO 4 (c + d + e is 1 or less, 0 < c < 1, 0 < d < 1, 0 < e < 1), LiFe f Ni g C o h Mn i PO4 (where f + g + h + i is less than or equal to 1, 0 < f < 1, 0 < g < 1, 0 < h < 1, 0 <i<1), etc., lithium compounds can be used as materials.

[0056] Or, composite materials such as the general formula Li (2-j) MSiO4 (M is one or more of Fe(II), Mn(II), Co( II), Ni(II), 0 ≦ j ≦ 2), etc., can be used. General Formula Li (2-j) MSiO4 representative examples include Li (2-j) FeSiO4, Li (2 -j) NiSiO4, Li (2-j) CoSiO4, Li (2-j) MnSiO4, Li (2-j) Fe k Ni l SiO4, Li (2-j) Fe k Co l SiO4, Li (2-j ) Fe k Mn l SiO4, Li (2-j) Ni k Co l SiO4, Li (2-j) Ni k [[ID=6​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​, Li (2-j) Fe r Ni s Co t Mn u SiO4 (r + s + t + u is 1 or less, 0 < r <1, 0 < s < 1, 0 < t < 1, 0 < u < 1), etc., lithium compounds can be used as materials. It is possible.

[0057] Also, as the positive electrode active material, A x M2(XO4)3 (A = Li, Na, Mg, M = Fe, M n, Ti, V, Nb, Al, X = S, P, Mo, W, As, Si), and nassicon-type compounds represented by the general formula can be used. As nassicon-type compounds, there are Fe2(MnO4) 3, Fe2(SO4)3, Li3Fe2(PO4)3, etc. Also, as the positive electrode active material , compounds represented by the general formula of Li2MPO4F, Li2MP2O7, Li5MO4 (M = Fe, Mn), perovskite-type fluorides such as NaFeF3, FeF3, metal chalcogenides (sulfides, selenides, tellurides) such as TiS2, Mo S2, etc., oxides having an inverse spinel-type crystal structure such as LiMVO4, vanadium oxide-based (V2O5, V6O 13 8, etc.), manganese oxides, organic sulfur compounds, etc. can be used as materials. L

[0058] iV3O8, etc.), manganese oxides, organic sulfur compounds, etc. can be used as materials.

[0058] In addition, when the carrier ion is an alkali metal ion or an alkaline earth metal ion other than lithium ion, as the positive electrode active material, in the above lithium compound, instead of lithium, an alkali metal (for example, sodium, potassium, etc.) or an alkaline earth metal (for example, calcium um, strontium, barium, beryllium, magnesium, etc.) may be used. It may be used.

[0059] Furthermore, the positive electrode active material layer contains, in addition to the positive electrode active material mentioned above, a binder to enhance the adhesion of the active material. The material may contain a binder, a conductive additive to enhance the conductivity of the positive electrode active material layer, etc.

[0060] The separator 213 can be cellulose (paper), glass fiber, or a material with voids. Use an insulator such as polypropylene, polyethylene, or polyphenylene sulfide. It is possible.

[0061] The electrolyte 220 is an electrolyte in which carrier ions can move, and the carrier ions A material containing lithium ions is used. Typical examples of electrolytes include LiPF6, L iClO4, LiAsF6, LiBF4, LiCF3SO3, Li(CF3SO2)2N There are lithium salts such as Li(C2F5SO2)2N or LiN(FSO2)2. These electrolytes may be used individually, or two or more may be used in any combination and ratio. That's fine.

[0062] Furthermore, a material that allows carrier ions to move is used as the solvent for the electrolyte 220. As the solvent, an aprotic organic solvent is preferred. A typical example of an aprotic organic solvent is... For example, ethylene carbonate (EC), propylene carbonate, dimethyl carbonate Diethyl carbonate (DEC), ethyl methyl carbonate (EMC), γ-butyro These include lactones, acetonitrile, dimethoxyethane, tetrahydrofuran, etc. One or more can be used. Also, a polymer material that gels as a solvent in the electrolyte. By using a special agent, adding a polymer material for gelling to the electrolyte, etc., leakage can be prevented. This increases safety. Furthermore, it enables the secondary battery to be made thinner and lighter. Typical examples of molecular materials include silicone gels, acrylic gels, acrylonitrile gels, and polycrystalline polymers. Polyethylene oxide gels, polypropylene oxide gels, fluorine polymer gels There are also ions, etc. Furthermore, as the solvent for the electrolyte, flame-retardant and non-volatile ionic liquids (room temperature solvents) are used. By using one or more molten salts, internal short circuits in secondary batteries and internal temperature fluctuations due to overcharging can be prevented. Even if the temperature rises, it can prevent secondary batteries from rupturing or catching fire. Furthermore, ionic liquids are... It is a salt in a fluid state and has high ion mobility (conductivity). Also, ionic liquids are cations. It contains ions and anions. As an ionic liquid, ethylmethylimidazolium (EMI) Ionic liquids containing thione, or N-methyl-N-propylpiperidinium (PP 13 ) Examples include ionic liquids containing cations.

[0063] Alternatively, instead of the electrolyte 220, a solid electrolyte containing inorganic materials such as sulfide-based or oxide-based materials may be used. Alternatively, a solid electrolyte containing polymer materials such as PEO (polyethylene oxide) can be used. This is possible. When using a solid electrolyte, the installation of separators and spacers becomes unnecessary. Furthermore, because the entire secondary battery can be solidified, the risk of leakage is eliminated, dramatically improving safety. ru.

[0064] Furthermore, the negative electrode active material used in the negative electrode active material layer may be lithium dissolved or deposited, or lithium Materials capable of reversible reactions with ions can be used, such as lithium metals, carbon-based materials, Alloy materials and the like can be used.

[0065] Lithium metal has a low oxidation-reduction potential (-3.045V compared to a standard hydrogen electrode), and its weight and They have a high specific capacity per unit volume (3860mAh / g and 2062mAh / cm³, respectively). 3 Therefore, it is preferable.

[0066] Carbon-based materials include graphite, easily graphitizable carbon (soft carbon), and poorly graphitizable carbon (hard carbon). Examples include carbon dioxide, carbon nanotubes, graphene, and carbon black.

[0067] Graphite includes mesocarbon microbeads (MCMB), coke-based artificial graphite, and pitch. There are artificial graphites such as synthetic graphite and natural graphites such as spheroidized natural graphite.

[0068] Graphite is formed when lithium ions are inserted into it (during the formation of lithium-graphite intercalation compounds). It exhibits a low potential similar to that of lithium metal (0.1-0.3V vs. Li / Li + ).child As a result, lithium-ion secondary batteries can exhibit a high operating voltage. Furthermore, graphite It has a relatively high capacity per unit volume, low volume expansion, is inexpensive, and is made of lithium metal. It is preferable because it has advantages such as higher safety compared to other options.

[0069] Furthermore, in addition to the carbon material mentioned above, the negative electrode active material can also be formed by alloying and dealloying reactions with carrier ions. A charge-discharge reaction can be performed using an alloy material or oxide. If the ion is a lithium ion, the alloying material could be, for example, Mg, Ca, Al , Si, Ge, Sn, Pb, As, Sb, Bi, Ag, Au, Zn, Cd, Hg, and I A material containing at least one of n, etc., can be used. Such an element is found in carbon. In contrast, silicon has a large capacity, and its theoretical capacity is exceptionally high at 4200mAh / g. Therefore, it is preferable to use silicon as the negative electrode active material. Alloy systems using such elements Examples of materials include Mg2Si, Mg2Ge, Mg2Sn, SnS2, and V2Sn3. , FeSn2, CoSn2, Ni3Sn2, Cu6Sn5, Ag3Sn, Ag3Sb, N i2MnSb, CeSb3, LaSn3, La3Co2Sn7, CoSb3, InSb, Examples include SbSn, etc.

[0070] Furthermore, as oxides, for example, SiO, SnO, and SnO2 can be used. SiO refers to silicon oxide powder containing silicon-rich regions, and SiO y (2> It can also be written as y>0). For example, SiO can be written as Si2O3, Si3O4, or Si2O. Materials containing one or more selected materials, as well as mixtures of Si powder and silicon dioxide (SiO2) It also contains other elements (carbon, nitrogen, iron, aluminum, copper, titanium, calcium). It may also contain (such as ions and manganese). That is, single-crystal Si, amorphous Si, polycrystalline Si This refers to a material containing multiple elements selected from i, Si2O3, Si3O4, Si2O, and SiO2. Furthermore, SiO is a colored material. (This is not SiO.) x If (X is 2 or greater), then it is colorless and transparent. It is bright or white and can be distinguished. However, SiO is used as a material for secondary batteries. When a secondary battery is made using this method, if the SiO oxidizes due to repeated charging and discharging, It may also be converted to SiO2.

[0071] Furthermore, titanium dioxide (TiO2) and lithium titanium oxide (Li4T) are used as negative electrode active materials. i5O 12 ), lithium-graphite intercalation compound (Li x C6), Niobium pentoxide (Nb2O5) Oxides such as tungsten oxide (WO2) and molybdenum oxide (MoO2) can be used. can.

[0072] Furthermore, the negative electrode active material has a Li3N-type structure, which is a lithium and transition metal binitride. Li 3-x M x N (M = Co, Ni, Cu) can be used. For example, Li 2.6 Co 0.4 The N3 has a large charge / discharge capacity (900mAh / g, 1890mAh / cm²). 3 )of This is preferable.

[0073] When a lithium-transition metal binitride is used, lithium ions are included in the negative electrode active material, Combined with lithium-ion-free materials such as V2O5 and Cr3O8 as positive electrode active materials. This is preferable. By pre-desorbing the lithium ions contained in the positive electrode active material, the negative electrode active material and Therefore, a lithium-transition metal composite can be used.

[0074] Furthermore, materials that undergo a conversion reaction can also be used as the negative electrode active material. For example, Lithium oxide, such as cobalt oxide (CoO), nickel oxide (NiO), and iron oxide (FeO). Transition metal oxides that do not undergo alloying reactions may be used as the negative electrode active material. Materials that can produce a response include Fe2O3, CuO, Cu2O, RuO2, and Cr2O. Third-order oxides, CoS 0.89 Sulfides such as NiS and CuS, Zn3N2, Cu3N, G Nitrides such as e3N4, phosphides such as NiP2, FeP2, CoP3, FeF3, BiF3 This also occurs with fluorides such as the above. Furthermore, because the potential of the above fluorides is high, they are not used as positive electrode active materials. That's fine.

[0075] Furthermore, the negative electrode active material layer contains, in addition to the negative electrode active material mentioned above, a binder to enhance the adhesion of the active material. The material may contain a binder, a conductive additive to enhance the conductivity of the negative electrode active material layer, etc.

[0076] In this embodiment, the configuration of the secondary battery is such that, for example, the thickness of the separator 213 is approximately 15 μm. m or more and approximately 30 μm or less, positive electrode current collector approximately 10 μm or more and approximately 40 μm or less, positive electrode active material layer approximately 50 μm or more and approximately 100 μm or less, negative electrode active material layer approximately 50 μm or more and approximately 100 μm or less, negative electrode The current collector should be approximately 5 μm or more and approximately 40 μm or less in thickness.

[0077] As the outer casing 211, a film made of a flexible substrate is used. The film is a laminate. i. A metal film having a resin layer on one or both sides, wherein the resin layer on one side is an adhesive layer. Preferably, the adhesive layer has the function of a heat seal layer. A heat-sealable resin film containing polypropylene or polyethylene can be used. In this embodiment, the film has a nylon resin on one side of an aluminum foil, An acid-resistant polypropylene film and a laminate of polypropylene films are provided on the other side of the aluminum foil. A metal film is used.

[0078] Furthermore, the film used for the exterior body 211 may be embossed. By using the outer casing 211, a more flexible secondary battery 101 can be made. .

[0079] Next, using Figures 3(C), 5, 6, and 7, we will explain the method for manufacturing the secondary battery 101. explain.

[0080] First, prepare the separator 213, the positive electrode current collector 212, and the negative electrode current collector 214. A positive electrode active material layer is formed on one or both sides of the positive electrode current collector 212. A negative electrode active material layer is formed on one or both sides.

[0081] A positive electrode current collector 212 and a negative electrode current collector 214 are each formed with an active material layer on one side. If the present is used, depending on the arrangement of the positive electrode current collector 212 and the negative electrode current collector 214, The surfaces of the electrode current collector 212 that do not have positive electrode active material formed on them, and the negative electrode of the negative electrode current collector 214. It is possible to create low-friction contact surfaces between surfaces where no active material has been formed. This is due to the difference between the inner and outer diameters of the curve that occurs when the secondary battery 101 is curved in a later process. This is preferable as it allows stress to be easily released. Also, the positive electrode current collector 212 and the negative electrode current collector 2 As for 14, if we use one in which an active material layer is formed on both sides, the secondary battery 10 The volume per unit volume can be increased.

[0082] Furthermore, it is preferable to form the positive electrode current collector 212 and the negative electrode current collector 214 into an elongated shape. That is, as shown in Figure 5(B), the length of the long side 212a of the positive electrode current collector 212 is equal to the length of the short side 2 It is preferable to make it 10 times or more than 12b, more preferably 20 times or more. Alternatively, positive electrode current collector 21 It is preferable that the length of the longer side 212a of 2 be 60 mm or more, and the length of the shorter side 212b be 6 mm or less. Similarly, as shown in Figure 5(A), the length of the long side 214a of the negative electrode current collector 214 is equal to the length of the short side 21 It is preferable to make it 10 times or more, more preferably 20 times or more, of 4b. Or the negative electrode current collector 214 The length of the longer side 214a should be 60 mm or more, and the length of the shorter side 214b should be 6 mm or less. By making the positive electrode current collector 212 and the negative electrode current collector 214 into an elongated shape, A secondary battery 101 of a specific shape can be manufactured. Therefore, it can be efficiently placed in the space of an electronic device. The next battery can be installed.

[0083] In this specification, the long side and short side of the positive electrode current collector 212 and the negative electrode current collector 214 are as follows: Measurements will be taken along the curves of the positive electrode current collector 212 and the negative electrode current collector 214.

[0084] Furthermore, after forming an active material layer on the metal foil, the positive electrode current collector 212 and the negative electrode are processed by laser. When cut to the shape of the current collector 214, the positive electrode current collector 212 and the negative electrode current collector 212 are produced with good yield and accurate shape. A polar current collector 214 can be manufactured.

[0085] Then, as shown in Figure 5(A), the negative electrode current collector 214 is placed on top of the separator 213. Next, the separator 213 is bent and placed on top of the negative electrode current collector 214. Next, as shown in Figure 5(B), the positive electrode current collector 212 is placed on top of the separator 213. Next, bend the separator 213 and place it on top of the positive electrode current collector 212. Sleep. Note that when using a current collector with an active material layer formed on one side, the positive electrode current collector 2 The 12 positive electrode active material layers and the negative electrode active material layer of the negative electrode current collector 214 face each other via a separator. Layer them like this.

[0086] If the separator 213 is made of a heat-sealable material such as polypropylene, the separator By heat-welding the areas where the 213s overlap and then stacking the next current collector, the manufacturing process This can suppress the shifting of the current collector during operation. Specifically, the negative electrode current collector 214 or the positive electrode current collector Regions where body 212 is not superimposed, but separators 213 overlap each other, for example, region 2 It is preferable to heat-weld 13a.

[0087] Furthermore, when the secondary battery 101 is bent, the curvature differs between the outer and inner sides of the bend, so the secondary battery It is anticipated that the current collector may shift inside the pond. However, as mentioned above, the separator 213 By heat welding the area where the elements overlap, for example, area 213a, if the current collector shifts... However, this prevents the positive electrode current collector and the negative electrode current collector from coming into contact and causing an internal short circuit.

[0088] By repeating this process, the positive electrodes are concentrated with the separator 213 in between, as shown in Figure 5(C). The current collector 212 and the negative electrode current collector 214 can be stacked.

[0089] Furthermore, a separator 213 that has been repeatedly bent in advance is fitted with multiple negative electrode current collectors 214 and Alternatively, multiple positive electrode current collectors 212 may be arranged alternately in between each other.

[0090] Next, as shown in Figures 5(C) and 5(D), there are multiple positive electrode current collectors 212 and multiple negative electrode current collectors. The electrode current collector 214 is covered by the separator 213, and multiple positive electrodes are bundled together by the binding material 221. The current collector 212 and the multiple negative electrode current collectors 214 are bundled together.

[0091] The binding material 221 may be polyimide film coated with adhesive, polypropylene, or poly Ethylene and the like can be used.

[0092] Furthermore, when manufacturing the secondary battery 101 as described in Figure 3(A), the separators 213 are connected to each other. The overlapping regions, for example region 213b, are heat-welded, and multiple positive electrode current collectors 212 and multiple The negative electrode current collector 214 is covered and secured with a separator 213.

[0093] Furthermore, when manufacturing the secondary battery 101 as described in Figure 3(B), as shown in Figure 3(C) A portion of the area covering multiple positive electrode current collectors 212 and multiple negative electrode current collectors 214 is removed in advance. The removed separator 213 is flanked by multiple positive electrode current collectors 212 and multiple negative electrode current collectors 21 Stack 4s.

[0094] Subsequently, the regions where the separators 213 overlap, for example region 213b, are heat-welded. Multiple positive electrode current collectors 212 and multiple negative electrode current collectors 214 are separated by a separator 2 from which some have been removed. Cover and bind with 13.

[0095] Figure 6(A) shows a cross-sectional view of the secondary battery 101 along the dashed-dotted line XY in Figure 5(D).

[0096] Next, as shown in Figure 6(B), multiple positive electrode current collectors 212 and lead electrodes 216a are connected. They are electrically connected. Additionally, multiple negative electrode current collectors 214 and lead electrodes 216b are electrically connected. The electrical connection can be made by ultrasonic welding. Note that as shown in Figure 6(B)... One end of each of the multiple elongated positive electrode current collectors 212, and each of the multiple negative electrode current collectors 21 It is preferable to weld one end of 4. In other words, one end of the secondary battery 101 Multiple positive electrode current collectors 212 are electrically connected, and at the other end of the secondary battery 101 It is preferable that multiple negative electrode current collectors 214 are electrically connected. This is due to the difference between the inner and outer diameters of the curve that occurs when the secondary battery 101 is curved in a later process. This makes it easier to release the stress.

[0097] Next, as shown in Figure 6(C), multiple positive electrode current collectors 212, multiple negative electrode current collectors 214, The parator 213, lead electrode 216a and lead electrode 216b are placed in a bent outer casing 2 Sandwich it with 11.

[0098] Next, as shown in Figure 6(D), two sides of the outer casing 211, specifically region 211a and region Region 211b is sealed by thermocompression bonding. At this time, lead electrode 216a and lead electrode 21 6b and a portion of the sealing material 217 are pulled out to the outside of the area enclosed by the outer casing 211.

[0099] Next, as shown in Figure 7(A), the electrolyte 220 is injected into the area enclosed by the outer casing 211. The electrolyte solution 220 may be injected under reduced pressure, as described later.

[0100] Next, the remaining side of the outer casing 211 is bonded under reduced pressure by thermocompression, as shown in Figure 7(B). Physically, region 211c is sealed. These operations are performed using a glove box, etc. The process should be carried out in an oxygen-free environment. Reduced pressure should be achieved using a degassing sealer, degassing liquid sealer, etc. This is good. Also, by sandwiching it between the two heatable bars of the sealer, region 211c It can be sealed by thermocompression bonding. The conditions for reduced pressure and thermocompression bonding are, for example, a vacuum of 60k For heat sealing, heating can be performed at 190°C and pressurization at 0.1 MPa for 3 seconds.

[0101] Next, it is preferable to perform an aging treatment on the secondary battery 101 obtained in the above process. The aging process controls the film that forms at the interface between the electrode and the electrolyte, thereby activating the active material. It is possible.

[0102] Furthermore, the aging treatment of the secondary battery 101 was opened once, and the results of the aging process were... After releasing the gas, you can add electrolyte 220 and reseal it. Between the positive and negative electrodes. If gas is present, it will cause an imbalance in the battery reaction, which will be a factor in the deterioration of the secondary battery 101. By removing the seal and resealing it, the degradation of the secondary battery 101 can be suppressed. When degassing and resealing are performed after the processing, when sealing region 211c of the outer casing 211 It is a good idea to reserve space for resealing.

[0103] Next, the secondary battery 101 is curved as shown in Figure 7(C). The curved secondary battery 101 may be used in electronic devices, or it may be mounted in electronic devices before the electronic device is installed. The secondary battery 101 may be bent along with its container.

[0104] By following the above steps, a secondary battery 101 that can be used in one aspect of the present invention can be manufactured. Cut.

[0105] (Embodiment 3) In this embodiment, Figure 8 will be used to describe another example of an electronic device according to one aspect of the present invention. do.

[0106] In Embodiment 1, the eyeglass-type device 100 was described, but one aspect of the present invention relates to this. Not necessarily.

[0107] For example, it can be a headset-type device 301 as shown in Figure 8. The net-type device 301 includes at least a microphone section 301a and a flexible pipe 301b It has an earphone section 301c. Inside the flexible pipe 301b and the earphone section 30 Multiple secondary batteries 101 are provided within 1c.

[0108] Furthermore, it can be a device 302 that can be directly attached to the body. Multiple secondary batteries 101 are provided within the slim casing 302a.

[0109] Furthermore, it can be made into a device 303 that can be attached to clothing. Multiple secondary batteries 101 are provided inside the housing 303a.

[0110] It can also be an armband-type device 304. The armband-type device 304 is the main body 304a It has a display unit 304b on top, and multiple secondary batteries 101 are provided inside the main body 304a. ru.

[0111] It can also be a wristwatch-type device 305. The wristwatch-type device 305 has a display unit 3 Having 05a, multiple secondary batteries 101 are provided inside the body of the wristwatch-type device 305. Yes, they are.

[0112] (Embodiment 4) In this embodiment, the wireless system that can be used in an electronic device according to one aspect of the present invention is described. I will explain.

[0113] Wireless communication and wireless power transfer are performed, for example, as described in Embodiment 1, on the glasses-type device 11 This can be done between 0 and the external display unit 112. However, it is not limited to this, and can also be done with external devices. It can be used in electronic devices that perform line communication.

[0114] Furthermore, it can also be used in electronic devices that do not have charging terminals and are charged by wireless power supply from an external source. This is possible. Such electronic devices can be charged easily, and furthermore, charging terminals Because it lacks internal components, it can enhance water and dust resistance.

[0115] The following describes a wireless system by taking the glasses-type device 110 and the external display unit 112 as examples. Fig. 9 shows a block diagram of the glasses-type device 110 and the external display unit 112.

[0116] The glasses-type device 110 according to this embodiment has a control module 415, a communication module 426, and a power management circuit 427. The external display unit 112 has a display module 421. The control module 415 is a controller that controls the entire glasses-type device 110, communication, and the display of information on the display unit 416. For example, it can be provided in the control unit 103 of the glasses-type device 110.

[0117] The control module 415 has a CPU 411, a battery 412, a regulator 413, a wireless receiver 414, and a wireless transmitter 428. As the battery 412, a secondary battery 10 1 can be used.

[0118] Also, the display module 421 has a display unit 416, a display driving circuit 419, a battery 417, a regulator 418, a wireless receiver 420, and a wireless transmitter 429. In this embodiment, an example with an external display unit 112 is shown, but it is not particularly limited, and instead of the display unit, for example, a sensor unit or the like can be used.

[0119] Also, the communication module 426 has a communication circuit 422, a battery 423, a regulator 42 4, a wireless receiver 425, and a wireless transmitter 430. As the battery 423, a secondary battery 101 can be used.

[0120] Each module has a regulator and a battery respectively. Each regulator​ It generates and supplies the necessary power or signals to each functional circuit from the connected battery. Furthermore, when charging the battery, the regulator can also prevent overcharging. Furthermore, Figure 9 shows an example where a wireless receiver and a wireless transmitter are connected to a single regulator. As shown, the regulator for the wireless receiver and the regulator for the wireless transmitter are connected separately. You may continue.

[0121] The glasses-type device 110 uses a power management circuit 427 to mutually control the power of each other's batteries. It can supply power to the batteries 412, 417, and 423. The power management circuit 427 also controls the power of the batteries 412, 417, and 423. It monitors the amount of power and wirelessly supplies power from one battery to another to charge them. This can be performed automatically or by user operation as appropriate. Alternatively, power management cycle Route 427 monitors the power levels of batteries 412, 417, and 423, and multiple batteries It can wirelessly supply power to other batteries for charging, either automatically or through user operation. It can be executed as appropriate.

[0122] Furthermore, the glasses-type device 110 can independently turn each module on or off. This can be set to a certain state. It allows for selective operation of driving only the modules to be used. The system enables power saving of the glasses-type device 110.

[0123] For example, when a user views information on the display unit 416 without using the communication function, the communication module In route 426, the power supply to the communication circuit 422 is cut off, and the battery 423 is used. The display module 421 and the control module 415 are turned on, while the off state is maintained. .

[0124] Further, for a still image, the display module 421 and the control module 415 are turned on, and after a still image is displayed on the display unit 416, even if the control module 41 5 is turned off, only the display module 421 can be turned on to continue displaying the still image. Note that an oxide semiconductor layer with a low off-current (for example, an oxide material containing In, Ga, and Zn) is used for the transistor of the display unit 416, or a configuration having a memory for each pixel is adopted. In this case, even if the power supply from the battery 417 is cut off after displaying the still image, the still image can be continuously displayed for a certain period of time.

[0125] In addition, in this embodiment, an example in which the display module 421, the control module 415, and the communication module 426 each have a battery is shown. However, it is not particularly limited to a total of three batteries. An electronic device having four or more batteries by adding further functional modules and their batteries may also be used.

[0126]

Example

[0127] In this example, the results of actually manufacturing the secondary battery 1101 and the glasses-type device 1100 are described using FIGS. 10, 11, 12, and 13.

[0128] For the secondary battery 1101 manufactured in this example, aluminum with a thickness of 20 μm was used as the positive electrode current collector, and copper with a thickness of 18 μm was used as the negative electrode current collector. LiCoO2 was used as the positive electrode active material, and a mixture of LiCoO2, acetylene black (AB) as a conductive assistant and binder, and PVDF was used as the positive electrode active material layer.

[0129] The mixing ratio is 90% by weight of LiCoO2, 5% by weight of AB, and 5% by weight of PVDF. did.

[0129] Furthermore, graphite is used as the negative electrode active material, and a conductive additive and gas-phase carbon fiber are used as a binder. VGCF) (registered trademark), carboxymethylcellulose (CMC), and styrene-porcine A diene rubber (SBR) was mixed to form the negative electrode active material layer. The mixing ratio was 96% graphite. The composition is as follows: weight%, VGCF(registered trademark) 1% by weight, CMC 1% by weight, and SBR 2% by weight. .

[0130] For the positive electrode, five positive electrode current collectors 1212, each coated with active material on both sides, were used. For the electrodes, ten negative electrode current collectors 1214, each coated with an active material on one side, were used.

[0131] Polypropylene was used for separator 1213. The electrolyte was EC:DEC:EMC. Dissolve 1.2 mol / L of LiPF6 in an organic solvent mixture in a ratio of 3:6:1 (by weight). As an additive, 0.5% by weight of propanesultone (PS) and vinylene carbonate ( A solution containing 0.5% by weight of VC was used.

[0132] Furthermore, the exterior 1211 uses an embossed aluminum laminate film. The aluminum laminate film has a thickness of 35 μm on one side of the aluminum. It has a 15μm nylon resin and an acid-resistant coating with a total thickness of 35μm on the other side of the aluminum. A laminated structure consisting of a polypropylene film and another polypropylene film was used.

[0133] The outer casing 1211, positive electrode current collector 1212, negative electrode current collector 1214 and separator used in this embodiment The design drawing for the 1213 is shown in Figure 10.

[0134] The width 1211a of the exterior body 1211 shown in Figure 10(A) was set to 125 mm.

[0135] The length of the long side 1212a of the positive electrode current collector 1212 shown in Figure 10(B) is 100 mm, and the length of the short side 12 The length of 12b was set to 5 mm. Also, the portion of the longer side 1212a to which the positive electrode active material is coated. The width of the minute, 1212c, was set to 90mm.

[0136] Also, the length of the long side 1214a of the negative electrode current collector 1214 is 100 mm, and the length of the short side 1214b is It was set to 5 mm. Also, the width of the portion of the long side 1214a where the negative electrode active material is coated is 1214 c was set to 93 mm. Also, the region where the positive electrode current collector 1212 and the negative electrode current collector 1214 do not overlap. The width 1214d was set to 7mm.

[0137] In this embodiment, the width 1213a of the separator 1213 shown in Figure 10(C) was set to 95 mm. This consists of multiple positive electrode current collectors 1212 and multiple negative electrode current collectors, as explained in Figures 3(B) and 3(C). A separator was used in which a portion of the area covering the current collector 1214 was removed.

[0138] The positive electrode current collector 12 was manufactured using the above materials and following the manufacturing process described in Embodiment 2. The stacked structure of 12 and the negative electrode current collector 1214 is as described in Figure 4(A), The electrode active material layer 212A and the negative electrode active material layer 214A face each other via the separator 213. They were stacked. Also, the surfaces of the negative electrode current collector 214 that do not have a negative electrode active material layer are in contact with each other. They were layered in this manner.

[0139] The external appearance of the secondary battery 1101 manufactured as described above is shown in Figure 11(A). Secondary battery 1 101 is covered by the outer casing 1211, and on the outside of the outer casing 1211 are the lead electrodes 1216a and A portion of lead electrode 1216b was pulled out. Also, lead electrode 1216a and lead electrode The pole 1216b and the outer casing 1211 were bonded together by a sealing material 1217.

[0140] Furthermore, the length of the long side of the outer casing 1211 was 125 mm before curving. The short side of 1211 is 6mm and the thickness is 3.5mm. Also, the weight of the secondary battery 1101 is The result was 4.5g.

[0141] And as shown in Figures 11(B) and 11(C), the temperature of the eyeglass-type device 1100 The part of the negative electrode current collector 214 that is electrically connected to the lead electrode 1216b is curved. A secondary battery 1101 was placed there. In Figure 11(B), it is curved along the temple part. The secondary battery 1101 was placed, and the radius of curvature of the curved section became 40 mm. Also, in Figure 11(C) The temple portion was formed by wrapping resin around a curved secondary battery 1101.

[0142] Examples of use of the glasses-type device 1100 are shown in Figures 12(A) and 12(B). Figure 12(A) Figure 12(B) shows a spectacle-type device 1100 having a light-emitting device, and the light-emitting device is labeled as such. The image shows a spectacle-type device 1100 with a device.

[0143] In the spectacle-type device 1100 shown in Figures 12(A) and 12(B), a curved secondary battery The temple portion was formed by wrapping resin around the 1101.

[0144] Furthermore, X-ray CT images of the secondary battery 1101 shown in Figures 11(B), 11(C), and 12. The image is shown in Figure 13.

[0145] As shown in FIG. 13, even when the secondary battery 1101 is bent, no abnormality in the current collector and the active material layer is observed.

Example

[0146] In this example, the results of evaluating the charge-discharge characteristics of the secondary battery 1101 fabricated in Example 1 will be described.

[0147] First, CC (constant current) charging, CCCV (constant current constant voltage) charging, and CC discharging will be described.

[0148] <CC Charging> CC charging will be described. CC charging is a charging method in which a constant current is passed through the secondary battery throughout the charging period and the charging is stopped when a predetermined voltage is reached. Assume that the secondary battery has an equivalent circuit of an internal resistance R and a secondary battery capacity C as shown in FIG. 14(A ). In this case, the secondary battery voltage V is the sum of the voltage V B across the internal resistance R and the voltage V R across the secondary battery capacity C C .

[0149] While CC charging is being performed, as shown in FIG. 14(A), the switch is turned on and a constant current I flows through the secondary battery. During this time, since the current I is constant, according to Ohm's R law of V =R×I, the voltage V R across the internal resistance R is also constant. On the other hand, the voltage V C across the secondary battery capacity C increases with the passage of time. Therefore, the secondary battery voltage V B increases with the passage of time .

[0150] And the secondary battery voltage V B ​When it reaches a predetermined voltage, for example, 4.1V, charging stops. . When CC charging stops, as shown in Fig. 14(B), the switch turns off and the current I = 0. Therefore, the voltage V R across the internal resistance R becomes 0V. Therefore, the voltage drop across the internal resistance R disappears, and the secondary battery voltage V B decreases.

[0151] Examples of the secondary battery voltage V B and the charging current during CC charging and after CC charging stops are shown in Fig. 14(C). The secondary battery voltage V that was increasing during CC charging B is shown to slightly decrease after CC charging stops.

[0152] <CCCV Charging> Next, CCCV charging will be described. CCCV charging first charges at a predetermined voltage in CC charging, and then, until the current flowing in CV (constant voltage) charging decreases, specifically, until it reaches the termination current value, it is a charging method that charges.

[0153] During CC charging, as shown in Fig. 15(A), the switch of the constant current power supply is on, the switch of the constant voltage power supply is off, and a constant current I flows into the secondary battery. During this period, since the current I is constant, according to Ohm's law of V R =R×I, the voltage V R across the internal resistance R is also constant. On the other hand, the voltage V C across the secondary battery capacity C increases with the passage of time.​​​​​​​​​When it reaches a predetermined voltage, for example, 4.1 V, it switches from CC charging to C V charging. While performing CV charging, as shown in Fig. 15(B), the switch of the constant voltage power source is turned on, and the switch of the constant current power source is turned off, and the secondary battery voltage V becomes constant. B On the other hand, the voltage V applied to the secondary battery capacity C increases with the passage of time. C Since V B =V R +V C the voltage V R applied to the internal resistance R decreases with the passage of time. As the voltage V R applied to the internal resistance R decreases, according to Ohm's law of V R =R×I, the current I flowing through the secondary battery also decreases. When the current I flowing through the secondary battery reaches a predetermined current, for example, a current equivalent to 0.01C,

[0155] charging is stopped. When stopping CCCV charging, as shown in Fig. 15(C), all switches are turned off, and the current I = 0. Therefore, the voltage V applied to the internal resistance R becomes 0V. R However, since the voltage V applied to the internal resistance R by CV charging is sufficiently small, R even when the voltage drop in the internal resistance R disappears, the secondary battery voltage V hardly drops. B Examples of the secondary battery voltage V

[0156] during CCCV charging and after stopping CCCV charging are shown in Fig. 15(D). It shows that even after stopping CCCV charging, the secondary battery voltage V B hardly drops. Examples of the charging current are shown in Fig. 15(D). B It shows that the secondary battery voltage V hardly drops.

[0157] <CC Discharge> Next, we will explain CC discharge. CC discharge is a discharge in which a constant current is applied to the secondary power supply throughout the entire discharge period. Discharged from the pond, secondary battery voltage V B Discharge stops when the voltage reaches a predetermined level, for example, 2.5V. This is a discharge method.

[0158] The secondary battery voltage V during CC discharge B Figure 16 shows an example of the charging current. Discharge progresses. According to this, secondary battery voltage V B The image shows it descending.

[0159] Next, we will explain the discharge rate and charge rate. The discharge rate is the ratio of the battery capacity to the charge rate. This is the relative ratio of the current during discharge, and is expressed in units of cubic centimeters (C). Therefore, the current equivalent to 1C is X(A). If discharged with a current of 2X(A), then 2C If it was discharged with a current of X / 5(A), then it was discharged at 0.2C. It is said that the charging rate is also similar; if charged with a current of 2X(A), it will charge at 2C. They said they charged it, and if they charged it with a current of X / 5(A), they said they charged it at 0.2C. .

[0160] Figure 17(A) shows the results of measuring the charge and discharge characteristics of the secondary battery 1101 in a flattened state. Also, as shown in Figure 11(B) and Figure 12, the ends have a radius of curvature of 40m. The results of measuring the charge and discharge characteristics while the device was curved at m are shown. Note that the charging was performed at 0.2C equivalent CC. The CV charging and CC charging were performed with a termination voltage of 4.1V and a termination current of 0.01C for CV charging. The discharge was performed at a CC discharge equivalent to 0.2C with a cutoff voltage of 2.5V.

[0161] The charge-discharge characteristics in the flat state (Figure 17(A)) and the curved state (Figure 17(B)) showed good agreement. Therefore, it has become clear that the secondary battery 1101 can obtain good charge and discharge characteristics even when bent. Also, it was shown that the capacity of the secondary battery 1101 is 110 mAh.

Explanation of Symbols

[0162] 100 Glasses-type device 101 Secondary battery 102 Display unit 103 Control unit 104 Terminal unit 110 Glasses-type device 112 Display unit 211 Exterior body 211a Region 211b Region 211c Region 212 Positive current collector 212A Positive electrode active material layer 212a Length 212b Length 213 Separator 213a Region 213b Region 214 Negative current collector 214A Negative electrode active material layer 214a Length 214b Length 216a Lead electrode 216b Lead electrode 217 Sealing material 220 Electrolyte solution 221 Binding material 301 Headset-type device 301a Microphone unit 301b Flexible pipe 301c Earphone unit 302 Device 302a Housing 303 Device 303a Housing 304 Wristband-type device 304a Main body 304b Display unit 305 Wristwatch-type device 305a Display section 411 CPU 412 batteries 413 Regulator 414 Wireless Receiver 415 Control Module 416 Display section 417 Battery 418 Regulator 419 Display driver circuit 420 Wireless Receiver 421 Display Module 422 Communication Circuit 423 Battery 424 Regulator 425 Wireless Receiver 426 Communication Module 427 Power management circuit 428 Wireless Transmitter 429 Wireless Transmitter 430 Wireless Transmitter 1100 Glasses-type device 1101 Secondary battery 1211 Exterior 1211a width 1212 Positive electrode current collector 1212a Long side 1212b Short side 1212c width 1213 Separator 1213a width 1214 Negative electrode current collector 1214a Long side 1214b Short side 1214c width 1214d width 1216a Lead electrode 1216b Lead electrode 1217 Sealant

Claims

1. Electronic device having a secondary battery, The aforementioned secondary battery comprises an outer casing, a plurality of positive electrode current collectors, a plurality of negative electrode current collectors, an electrolyte, and a separator. The separator has a first region and a second region, The first region is installed sandwiched between the plurality of positive electrode current collectors and the plurality of negative electrode current collectors, The first region has a region covered by the second region, The first region has a first direction along the longitudinal axis of the plurality of positive electrode current collectors and the plurality of negative electrode current collectors, When the separator is expanded, the longitudinal axis of the second region is perpendicular to the first direction, in the electronic device.

2. In claim 1, An electronic device in which the plurality of positive electrode current collectors and the plurality of negative electrode current collectors are bound together by the second region.

3. In claim 1 or claim 2, The plurality of negative electrode current collectors include a first negative electrode current collector and a second negative electrode current collector. The first negative electrode current collector has a negative electrode active material layer on one side and no negative electrode active material on the other side. The second negative electrode current collector has a negative electrode active material layer on one side and no negative electrode active material on the other side. An electronic device characterized in that the other surface of the first negative electrode current collector is in contact with the other surface of the second negative electrode current collector.

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