Energy storage devices and electronic equipment

Abstract

To provide an energy storage device with a structure that is resistant to deformation such as bending. [Solution] The electrode plate is covered with a sheet made of an insulator that has been folded in half. The sheet is around the periphery of the electrode plate. By joining the overlapping parts at the edges, it is processed into a bag-like or envelope-like shape. It is preferable that the electrode plate is fixed to the outer casing along with the sheet. If further deformation occurs, the electrode plate can slide inside the outer casing along with the sheet, so the electrode plate It is possible to alleviate the stress caused by bending.

Description

Technical Field

[0001] The present invention relates to an object, a method, or a manufacturing method. Alternatively, the present invention relates to a process, a machine , a manufacture, or a composition of matter. For example, one aspect of the present invention relates to an electrical storage device and a method for manufacturing the same. For example, one aspect of the present invention relates to an electrical storage device, a semiconductor device, a display device, a light-emitting device, a storage device, a driving method thereof, or , a manufacturing method thereof, and the like.

Background Art

[0002] The development of various electrical storage devices such as lithium ion secondary batteries, lithium ion capacitors, air batteries, etc. has been actively carried out. In particular, lithium ion secondary batteries with high output and high energy density ( for example, see Patent Document 1) have rapidly expanded their demand with the development of the semiconductor industry. Rechargeable electrical storage devices are essential in modern information society as a power supply for various electronic devices such as mobile phones, smartphones, notebook personal computers, etc. portable information terminals, portable music players, digital cameras, or medical devices. .

[0003] In recent years, display devices having flexibility for use by being mounted on a human body or a curved surface, such as a display device to be mounted on the head, have been proposed. Also, an electrical storage device having flexibility that can be mounted on a curved surface is demanded. Patent Document 2 describes an electrical storage device that can be curved or bent. .

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Publication No. 2012-9418 [Patent Document 2] Japanese Patent Publication No. 2013-211262 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The objective of one embodiment of the present invention is to provide a novel energy storage device, or a novel method for manufacturing the same, etc. Yes. For example, one object of one embodiment of the present invention is to provide an energy storage body that is robust against deformation such as bending. This includes providing a battery storage system that is less prone to defects.

[0006] Furthermore, the description of multiple problems does not preclude the existence of each other. The embodiments do not need to solve all of these problems. Also, the description, drawings, claims, etc. From the above, other issues will naturally become clear, and these issues are also addressed by the present invention. This could become a challenge in one form. [Means for solving the problem]

[0007] One embodiment of the present invention comprises a first electrode plate, a second electrode plate, a first sheet made of an insulator, and It has an outer casing that houses the first and second electrode plates, and a first sheet that is folded in half The first electrode plate is covered, and the first electrode plate, together with the first sheet, is fixed to the outer casing. It is an energy storage device.

[0008] One embodiment of the present invention comprises a first electrode plate, a second electrode plate, and two first sheets made of an insulator. It has an outer casing that houses the first and second electrode plates, and the two first sheets The first electrode plate is covered, and the first electrode plate, together with the two first sheets, is fixed to the outer casing. It is an energy storage device.

[0009] In the above embodiments, the second electrode plate can be fixed to the outer casing. In the above embodiments, a second sheet made of an insulator that is folded in half, or two second sheets The second electrode plate is covered by the sheet, and together with the second sheet, the second electrode plate is attached to the outer casing. It is possible for it to be fixed in place. [Effects of the Invention]

[0010] One embodiment of the present invention provides a novel energy storage device, or a novel method for manufacturing the same, etc. For example, one embodiment of the present invention provides a battery storage body that is resistant to deformation such as bending. This makes it possible to provide energy storage devices that are less prone to defects.

[0011] Furthermore, the description of these effects does not preclude the existence of other effects. The form does not necessarily have to have all of these effects. Furthermore, regarding the form of the present invention... For issues, effects, and novel features other than those mentioned above, please refer to the description and drawings in this specification. It will become clear naturally. [Brief explanation of the drawing]

[0012] [Figure 1] A plan view showing an example of the configuration of an energy storage device. [Figure 2] Cross-sectional view of Figure 1. [Figure 3] Cross-sectional view of Figure 1. [Figure 4] Cross-sectional view of Figure 1. [Figure 5] Cross-sectional view of Figure 1. [Figure 6] A diagram showing an example of the configuration of a positive electrode plate. [Figure 7] A diagram showing an example of the configuration of the negative electrode plate. [Figure 8] A diagram showing an example configuration of the current collectors for the positive and negative electrode plates. [Figure 9] A diagram showing an example of separator configuration and an example of energy storage body fabrication. [Figure 10] A diagram showing an example of separator configuration and an example of energy storage body fabrication. [Figure 11] A diagram showing an example of the configuration and fabrication of an energy storage device. [Figure 12] A diagram showing an example of the configuration and fabrication of an energy storage device. [Figure 13] A diagram showing an example of the configuration and fabrication of an energy storage device. [Figure 14] A diagram showing an example of the configuration and fabrication of an energy storage device. [Figure 15] A diagram showing an example of the configuration and fabrication of an energy storage device. [Figure 16] A diagram showing an example of the configuration and fabrication of an energy storage device. [Figure 17] A diagram showing the cross-sectional structure of an energy storage device. [Figure 18] A diagram showing the cross-sectional structure of an energy storage device. [Figure 19] A diagram showing the cross-sectional structure of an energy storage device. [Figure 20] A diagram showing an example of the configuration of an electronic device. [Figure 21] A diagram showing an example of the configuration of an electronic device. [Figure 22] A diagram showing an example of the configuration of an electronic device. [Figure 23] A diagram showing an example of the configuration of an electronic device. [Modes for carrying out the invention]

[0013] In this specification, "energy storage device" refers to all elements and devices that have an energy storage function. For example, as energy storage devices, there are batteries, primary batteries, secondary batteries, lithium-ion secondary batteries, lithium Examples include air-based secondary batteries, capacitors, and lithium-ion capacitors. Also, electrification... A scientific device is a device that can function by utilizing elements such as energy storage bodies, conductive layers, resistors, and capacitive elements. This refers to the general term. Furthermore, electronic devices, electrical equipment, and mechanical devices, etc., are considered to be one embodiment of the present invention. It may have such an energy storage device.

[0014] Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention The embodiments are not limited to those described below and do not depart from the spirit and scope of the present invention. It will be readily apparent to those skilled in the art that its form and details can be varied in various ways. Therefore, the embodiments of the present invention should be interpreted as being limited to those described in the embodiments below. isn't it.

[0015] Furthermore, several embodiments are shown below, but these embodiments can be combined as appropriate. It is possible. Also, if several configuration examples are shown within one embodiment, they can be used interchangeably with each other. The configuration examples can be combined as needed.

[0016] A power storage device according to one embodiment of the present invention has a positive electrode and a negative electrode. The positive electrode and the negative electrode are each It has one or more electrode plates (positive plate, negative plate) that are shaped like a plate or flat plate. It prevents short circuits. To prevent this, at least one of the two adjacent electrode plates is a sheet whose two sides are insulators. It is covered with (or can be called a film). In the following explanation, The sheet covering the electrode plates is sometimes called a "separator." This embodiment describes examples of the configuration of an energy storage body and examples of its manufacturing method.

[0017] <<Example of Energy Storage System Configuration 1>> Referring to Figures 1-16, we will explain examples of the configuration of an energy storage device and examples of its manufacturing method.

[0018] Figure 1 is a top view showing an example of the configuration of an energy storage device. Figures 2-5 are cross-sectional views of Figure 1. Figure 2 is A Figure 1 is a cross-sectional view along line 1-A2, Figure 3 is a cross-sectional view along line B1-B2, and Figure 4 is a cross-sectional view along line C1-C2. Figure 5 is a cross-sectional view taken along line D1-D2. Figures 2-5 also show enlarged partial views.

[0019] As shown in Figure 1, the energy storage body 300 consists of a positive electrode 101, a negative electrode 102, a sealant 104, and a sealant 1 It has 05 and an outer casing 107. Here, as an example of a power storage body 300, the outer casing 10 The configuration in which the planar shape of 7 is a quadrilateral will be explained. Furthermore, to facilitate understanding of the embodiment of the present invention... Terms such as top, bottom, left, right, vertical, and horizontal are used based on the drawing method used in the referenced drawing. This may be the case. For example, in Figure 1, the positive electrode 101 is located on the lower side surface of the outer casing 107. Therefore, it can be explained that the negative electrode 102 is located on the upper side surface opposite to its side surface. can.

[0020] The positive electrode 101 and the negative electrode 102 are the parts (101a, 1) that function as terminals of the energy storage body 300. Except for 02a), it is sealed inside the outer casing 107. Inside the outer casing 107 is the electrolyte 10 Part 3 is also enclosed (Figures 2 and 3). Below, we will discuss parts 101a and 102a respectively. These will be referred to as "terminal section 101a" and "terminal section 102a".

[0021] As shown in Figures 1 and 3, one of the two opposing sides (lower side and upper side) of the exterior body 107 Terminal portion 101a protrudes from one side, and terminal portion 102a protrudes from the other side. Energy storage body 300 Charging and discharging are performed via terminals 101a and 102a. A positive lead can be connected to terminal 01a. A negative lead can be connected to terminal 102a. It is possible.

[0022] Here, as an example of the energy storage body 300, the positive electrode 101 has three positive electrode plates (111), and the negative electrode The pole 102 describes a configuration having four negative electrode plates (120, 121) (Figures 2 and 3). The electrode plate 111 has a positive electrode current collector 11 and a positive electrode active material layer 12, and a negative electrode plate 120 and a negative electrode plate 1 21 each has a negative electrode current collector 21 and a negative electrode active material layer 22. The terminal portion 101a is It consists of three positive current collectors 11 that are electrically connected to each other. The terminal portion 102a is It consists of four negative electrode current collectors 21 that are electrically connected to each other. Multiple positive electrode current collectors 1 The electrical connection of 1, and the electrical connections of the multiple negative electrode current collectors 21, for example, are connected It can be done by combining them.

[0023] Both sides of each electrode plate (111, 120, 121) of the energy storage unit 300 are covered with a separator 130. The separator 130 is, for example, made from a single sheet of insulating material 30 that has been folded in half. It can be configured (see Figure 9). Separator 130 will be discussed later. As an example of the energy storage body 300, both the positive and negative electrode plates are covered with a separator 130. Let me explain the configuration. Of course, the present invention is not limited to this embodiment, and the positive plate or It is possible to configure the device so that one of the negative electrode plates is covered by the separator 130.

[0024] The outer casing 107 can be manufactured, for example, by folding a single film 70 in half (Figure 15. Figure 16). To form the film 70 into a bag shape, the three sides of the outer casing 107 (left side, top side, bottom side) A joint portion 71 for fixing the films 70 together is formed along the edge. 07 will be discussed later.

[0025] The energy storage body 300 is provided with sealing bodies 104 and 105 sandwiched between the outer casing 107. As shown in Figures 1 and 3, the sealant 104 fills the gap between the positive electrode 101 and the outer casing 107. It is provided at the lower end of the outer casing 107 so as to fill the gap. The sealing body 105 is located outside the negative electrode 102. It is provided at the upper end of the outer casing 107 so as to fill the gap in the body 107. In the portion formed at the lower end of the outer casing 107, the outer casing 107 is fixed to the sealing body 104. In the portion formed at the upper end of the outer casing 107 of the joint 71, the outer casing 107 is sealed. It is fixed to the stopper 105. Figure 4 shows the sealant 104 and positive electrode 10 at the joint 71. Figure 5 shows the cross-sectional structure of part 1, and the cross-section of the sealant 105 and negative electrode 102 at the joint 71. It shows the structure.

[0026] The following describes an example of the configuration of the components of the energy storage body 300, and how to manufacture the energy storage body 300, with reference to the drawings. Let's explain the legal provisions.

[0027] <Electrode plate> Figures 6A-6C are perspective views showing examples of the configuration of the positive electrode plate. Figures 7A-7C show the configuration of the negative electrode plate. This is a perspective view showing an example. Figures 8A-8C show examples of the configuration of the current collectors for the positive and negative plates. This is a view drawing.

[0028] The positive electrode plate 110 has a positive electrode current collector 11 and a positive electrode active material layer 12 (Figure 6A). Negative electrode plate 1 20 has a negative electrode current collector 21 and a negative electrode active material layer 22 (Figure 7A). Positive electrode plate 110, negative The electrode plate 120 is an electrode plate in which an active material layer is formed on one side.

[0029] When both the positive and negative electrodes are composed of two or more electrode plates, an active material layer is formed on both sides of the electrode. Electrode plates are used. Positive electrode plates (111, 112) and negative electrode plates (121, 122) are as follows. This is an electrode plate with a configuration. The positive electrode plate 111 has positive electrode active material on both sides of one positive electrode current collector 11. Layer 12 is formed (Figure 6B). The negative electrode plate 121 has a negative electrode current collector 21 on both sides. The negative electrode active material layer 22 is formed (Figure 7B). The positive electrode plate 112 consists of two positive electrode plates 110. It corresponds to an electrode plate structure with two back-to-back contacts and has two positive electrode current collectors 11 (Figure 6C). The electrode plate 122 corresponds to an electrode plate with a structure in which two negative electrode plates 120 are placed back to back, and the two negative It has a polar current collector 21 (Figure 7C). Here, the positive electrode 101 is composed of three positive electrode plates 111. The negative electrode 102 is composed of two negative electrode plates 120 and two negative electrode plates 121.

[0030] Figure 8A is a plan view showing an example configuration of the positive electrode current collector 11. Figure 8B shows an example configuration of the negative electrode current collector 21. This is a plan view showing the positive electrode current collector 11 having two parts (11a, 11b). Alternatively, the portion in which the positive electrode active material layer 12 is formed on both sides is portion 11b. Therefore, the positive electrode active material layer 12 is not formed. The portion 11a constitutes the terminal portion 101a of the positive electrode 101. The negative electrode current collector 21 also similarly has two parts (21a, 21b). One side or The portion where the negative electrode active material layer 22 is formed on both sides is portion 21b. In portion 21a, the negative electrode active The material layer 22 is not formed. Part 21a constitutes the terminal portion 102a of the negative electrode 102. Here, we will refer to part 11a as "tab 11a" and part 21a as "tab 21a". do.

[0031] Figure 8C is a diagram illustrating the stacked state of electrode plates (111, 120, 121) and current collection. This is a plan view of the body (11, 21). The vertical and horizontal dimensions of the portion 21b where the negative electrode active material layer 22 is formed. By making the size longer than the portion 11b of the positive electrode current collector 11, the positive electrode plate 111 and the negative electrode plate With (120, 121) stacked, the peripheral end of the positive electrode current collector 11 is on the surface of the negative electrode current collector 21. It is made to exist on the surface. With this configuration, the electric field is at the peripheral edge of the negative electrode plate 121. This reduces the concentration of particles, thus suppressing whisker precipitation in this region. This extends the charge-discharge cycle life of the energy storage unit 300.

[0032] Alternatively, the outside of portion 21b may be positioned so that the negative electrode active material layer 22 is in definite opposition to the positive electrode active material layer 12. By making the shape and size smaller than part 11b, the peripheral end of the negative electrode current collector 21 becomes the positive electrode current collector It is possible to stack the electrode plates (111, 120, 121) so that they overlap precisely with 11. Also, make parts 11b and 21b the same size, and ensure their peripheral edges coincide. It is also possible to stack electrode plates (111, 120, 121) on top of each other.

[0033] The electrode plates (111, 120, 121) may have elements other than the current collector and active material layer. This section describes the components and materials that make up the electrode plates (111, 120, 121).

[0034] [Positive electrode current collector] The positive electrode current collector 11 is made of metals such as stainless steel, gold, platinum, aluminum, titanium, and this Materials with high conductivity and that do not alloy with carrier ions such as lithium, such as these alloys, are used. It can also withstand silicon, titanium, neodymium, scandium, molybdenum, etc. Aluminum alloys to which elements that improve thermal properties are added can be used. It may be formed with a metallic element that reacts with silicon to form a silicide. The metallic elements that form reside include zirconium, titanium, hafnium, and vanadium. Examples include niobium, tantalum, chromium, molybdenum, tungsten, cobalt, and nickel. The positive electrode current collector 11 can be foil-shaped, plate-shaped, sheet-shaped, mesh-shaped, perforated metal-shaped, or expanded Materials such as metal can be used as appropriate. The thickness of the positive electrode current collector 11 is, for example, 5μm. It can be made m or more and 30 μm or less. By making the thickness 5 μm or more and 10 μm or less, The energy storage body 300 can be made thinner and lighter, and the energy storage body 300 can be made more flexible. This is preferable because it allows for this.

[0035] Furthermore, an undercoat layer made of graphite or the like may be provided on the surface of the positive electrode current collector 11.

[0036] [Cathode active material layer] The positive electrode active material layer 12 contains not only the positive electrode active material but also a binder (bio) to improve the adhesion of the positive electrode active material. The device may also contain conductive additives to enhance the conductivity of the positive electrode active material layer 12.

[0037] Positive electrode active material can have an olivine-type crystal structure, a layered rock salt-type crystal structure, or a spinel-type crystal structure. Examples include composite oxides having the following crystalline structure. Examples of positive electrode active materials include LiFeO2, L Compounds such as iCoO2, LiNiO2, LiMn2O4, V2O5, Cr2O5, MnO2 Use an object.

[0038] In particular, LiCoO2 has a large capacity and is more stable in the atmosphere than LiNiO2. Therefore, it is preferable because it has advantages such as being thermally stable compared to LiNiO2.

[0039] In addition, when a small amount is added to a compound having a spinel-type crystal structure containing manganese such as LiMn2O4 of lithium nickelate (LiNiO2, LiNi , c , , a , , d , a , e , , a , c , a , i , a , g , e , b , , b , d ,

[0041] , b , , e , b , c , , h , d , f , b MO2 (M = Co, Al, etc.)), there are advantages such as suppressing the elution of manganese and suppressing the decomposition of the electrolytic solution, which is preferable Yes.

[0040] In addition, as the positive electrode active material, a composite material (general formula LiMPO4 (M is one or more of Fe(II), Mn(I I), Co(II), Ni(II))) can be used. Representative examples of the general formula LiMP O4 include LiFePO4, LiNiPO4, LiCoPO4, LiMnP O4, LiFe a Ni b PO4, LiFe a Co b PO4, LiFe a Mn b PO4, L iNi a Co b PO4, LiNi a Mn b PO4 (a + b is 1 or less, 0 < a < 1, 0 < b < 1), LiFe c Ni d Co e PO4, LiFe c Ni d Mn e PO4, LiNi c C o d Mn e PO4 (c + d + e is 1 or less, 0 < c < 1, 0 < d < 1, 0 < e < 1), Li Fe f Ni g Co h Mn i PO4 (f + g + h + i is 1 or less, 0 < f < 1, 0 < g < 1, 0 < h < 1, 0 < i < 1), etc. can be used as a material.

[0041] ​In particular, LiFePO4 is known for its safety, stability, high capacity density, high potential, and resistance to initial oxidation (charging). The requirements for a positive electrode active material, such as the presence of permeable lithium ions, are met in a balanced manner. Therefore, it is preferable.

[0042] Furthermore, the positive electrode active material is Li (2-j) MSiO4 (where M is Fe(II), Mn( II) Composite materials such as Co(II), Ni(II), one or more of the above, 0≦j≦2) are used. This is possible. General formula Li (2-j) A typical example of MSiO4 is Li (2-j) FeSi O4, Li (2-j) NiSiO4, Li (2-j) CoSiO4, Li (2-j) Mn SiO4, 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 Mn l SiO4(k+l is 1 or less, 0 <k<1、0<l<1)、Li (2 -j) Fe m Ni n Co q SiO4, Li (2-j) Fe m Ni n Mn q SiO4, Li (2-j) Ni m Co n Mn q SiO4(m+n+q is less than or equal to 1, 0 <m<1、0<n<1 , 0 < q < 1), 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. of lithium compounds can be used as materials for this purpose.

[0043] In addition, as the positive electrode active material, Nasicon type compounds represented by the general formula AxM2(XO4)3 (A = Li, Na, Mg, M = Fe, Mn , Ti, V, Nb, Al, X = S, P, Mo, W, As, Si) can be used. Examples of Nasicon type compounds include Fe2(MnO4)3 , Fe2(SO4)3, Li3Fe2(PO4)3, etc. Also, as the positive electrode active material, compounds represented by the general formula Li2MPO4F, Li2MP2O7, Li5MO4 (M = Fe, Mn ), perovskite type fluorides such as NaFeF3, FeF3, metal chalcogenides (sulfides, selenides, tellurides) such as TiS2, MoS 2, etc., oxides having a reverse spinel type crystal structure such as LiMVO4, vanadium oxide systems (V2O5, V6O13, Li V3O8, etc.), manganese oxides, organic sulfur, etc. can be used as materials. When the carrier ion is an alkali metal ion other than lithium ion or an alkaline earth metal ion , as the positive electrode active material, in the above lithium compounds, lithium-containing composite phosphates and lithium

[0044] -containing composite silicates, etc., an alkali metal (e.g., sodium or potassium, etc.) or an alkaline earth metal (e.g., calcium, strontium, barium , beryllium, magnesium, etc.) can be used instead of lithium. For example, NaFeO2 or Na 3[Fe 2 / [[ID=1 / 2 Mn 1 / 2 Using sodium-containing layered oxides such as O2 as positive electrode active material It is possible to be there.

[0045] Furthermore, the positive electrode active material may be a material made by combining multiple of the above materials. For example, the above A solid solution formed by combining multiple materials can be used as the positive electrode active material. For example, LiC o 1 / 3 Mn 1 / 3 Ni 1 / 3 A solid solution of O2 and Li2MnO3 can be used.

[0046] A carbon layer or an oxide layer such as zirconium oxide may be provided on the surface of the positive electrode active material layer 12. By providing a carbon layer or oxide layer, the conductivity of the electrode can be improved. (Positive electrode active material) The carbon layer coating on layer 12 is achieved by mixing carbohydrates such as glucose during the firing of the positive electrode active material. It can be formed by and

[0047] The primary particles of the granular positive electrode active material layer 12 have an average particle size of 50 nm to 100 μm. It's a good idea to use something.

[0048] Conductive additives include acetylene black (AB), graphite particles, and carbon. Nanotubes, graphene, fullerenes, etc., can be used.

[0049] The conductive additive can form an electron conduction network within the positive electrode active material layer 12. The conductive additive can maintain the electrical conduction pathway between the positive electrode active materials. By adding a conductive additive to the material layer 12, a positive electrode active material layer 1 with high electronic conductivity is obtained. It is possible to achieve 2.

[0050] Graphene possesses excellent electrical properties, including high conductivity, as well as flexibility and mechanical strength. It possesses excellent physical properties. Furthermore, graphene is used as a conductive additive in the negative electrode active material layer 22. It can also be used. By using graphene as a conductive additive, the active materials can interact with each other. This can increase the number of contact points and the contact area.

[0051] In addition, as a binder, polyimide is also used, as is typical polyvinylidene fluoride (PVDF). Polytetrafluoroethylene, polyvinyl chloride, ethylene propylene diene polymer - Styrene-butadiene rubber, acrylonitrile-butadiene rubber, fluororubber, poly Using vinyl acetate, polymethyl methacrylate, polyethylene, nitrocellulose, etc. It is possible.

[0052] The binder content relative to the total amount of positive electrode active material layer 12 is preferably between 1 wt% and 10 wt%. More preferably 2wt% to 8wt%, and even more preferably 3wt% to 5wt%. Preferred. Furthermore, the content of the conductive additive relative to the total amount of the positive electrode active material layer 12 is 1 wt% or more. A value of 0 wt% or less is preferred, and a value of 1 wt% to 5 wt% is more preferred.

[0053] [Negative electrode current collector] The negative electrode current collector 21 is made of metals such as stainless steel, gold, platinum, zinc, iron, copper, tantalum, and titanium. , and alloys thereof, which have high conductivity and do not alloy with carrier ions such as lithium. Materials can be used. Also, silicon, titanium, neodymium, scandium, molybdenum Aluminum alloys to which elements that improve heat resistance, such as ammonium compounds, have been added can be used. Alternatively, it may be formed from a metallic element that reacts with silicon to form a silicide. Metal elements that react to form silicides include zirconium, titanium, hafnium, Vanadium, niobium, tantalum, chromium, molybdenum, tungsten, cobalt, nickel There are various types, such as foil, plate (sheet), mesh, and perforated metal. Shapes such as expanded metal can be used as appropriate. The thickness of the negative electrode current collector 21 is, for example, For example, the thickness can be between 5 μm and 30 μm. By doing so, the energy storage body 300 can be made thinner and lighter, and furthermore, the energy storage body 300 can be bent It is preferable because it makes it easier to do.

[0054] Furthermore, even if an undercoat layer is provided on the surface of the negative electrode current collector 21 using graphite or the like, good.

[0055] [Negative electrode active material layer] The negative electrode active material layer 22 contains the negative electrode active material as well as a binder (bio) to improve the adhesion of the negative electrode active material. The negative electrode active material layer 22 may also contain conductive additives to enhance its conductivity.

[0056] The negative electrode active material is a material capable of dissolving and depositing lithium, or inserting and deinserting lithium ions. If available, it is not particularly limited. Materials for the negative electrode active material include lithium metal and lithium titanate. Other examples include carbon-based materials and alloy-based materials, which are common in the field of energy storage.

[0057] 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.

[0058] 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. Graphite includes mesocarbon microbeads (MCMB), coke-based artificial graphite, and pitch. Examples include synthetic graphite such as lithium-ionized artificial graphite and natural graphite such as spheroidized natural graphite. Graphite is lithium-ionized When mu ions are inserted between the layers (during the formation of lithium-graphite intercalation compounds), lithium It exhibits a low potential similar to that of metals (0.1 to 0.3V vs. Li / Li + ). This means Furthermore, lithium-ion batteries can exhibit a high operating voltage. In addition, graphite, per unit volume It has a relatively high capacity per unit area, low volume expansion, is inexpensive, and is safer than lithium metal. It is preferable because it has advantages such as high performance.

[0059] The negative electrode active material can undergo charge and discharge reactions through alloying and dealloying reactions with lithium. Other alloy materials can also be used. For example, when the carrier ion is a lithium ion. Examples of alloying materials include Al, Si, Ge, Sn, Pb, Sb, Bi, Ag, Zn, and C. Examples of materials containing at least one of d, In, Ga, etc. Such elements include carbon. In contrast, it has a much larger capacity, and silicon in particular has a remarkably high theoretical capacity of 4200mAh / g. Therefore, it is preferable to use silicon as the negative electrode active material. Examples of system materials include Mg2Si, Mg2Ge, Mg2Sn, SnS2, and V2Sn3. , FeSn2, CoSn2, Ni3Sn2, Cu6Sn5, Ag3Sn, Ag3Sb, N i2MnSb, CeSb3, LaSn3, La3Co2Sn7, CoSb3, InSb, Examples include SbSn.

[0060] Furthermore, the negative electrode active material includes SiO, SnO, SnO2, titanium dioxide (TiO2), and lithium Mutitanium oxide (Li4Ti5O 12 ), lithium-graphite intercalation compound (Li x C6), five Niobium oxide (Nb2O5), tungsten oxide (WO2), molybdenum oxide (MoO2) Oxides such as the following can be used.

[0061] Furthermore, the negative electrode active material is a Li3N type structure, which is a lithium and transition metal binitride. i 3-x M x N (M = Co, Ni, Cu) can be used. For example, Li 2.6 C o 0.4 The N3 has a large charge / discharge capacity (900mAh / g, 1890mAh / cm²). 3 ) indicates preferable.

[0062] 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 A lithium-transition metal composite can be used as the composite material.

[0063] 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.

[0064] Furthermore, graphene may be formed on the surface of the negative electrode active material. For example, the negative electrode active material may be silicon In this case, the volume change associated with the absorption and release of carrier ions during the charge-discharge cycle is Because it is large, the adhesion between the negative electrode current collector 21 and the negative electrode active material layer 22 decreases, and the battery The properties deteriorate. Therefore, graphene is formed on the surface of the silicon-containing negative electrode active material. Then, even if the volume of silicon changes during the charge-discharge cycle, the negative electrode current collector 21 and the negative electrode active This is preferable because it can suppress a decrease in adhesion with the material layer 22, thereby reducing the degradation of battery characteristics. It seems so.

[0065] Furthermore, a film such as an oxide may be formed on the surface of the negative electrode active material. During charging, the electrolyte The film formed by decomposition, etc., cannot release the amount of charge consumed during its formation. , forming irreversible capacitance. In contrast, a film of oxide or the like is applied to the surface of the negative electrode active material beforehand. By providing this feature, the occurrence of irreversible capacity can be suppressed or prevented.

[0066] The coatings used to cover such negative electrode active materials include niobium, titanium, vanadium, tantalum, and Sten, zirconium, molybdenum, hafnium, chromium, aluminum or s An oxide film of any one of the elements of Licon, or an oxide film containing any one of these elements and lithium. It can be used. Such a coating is formed on the negative electrode surface by the decomposition products of the conventional electrolyte. The resulting coating is sufficiently dense compared to other coatings.

[0067] For example, niobium pentoxide (Nb2O5) has an electrical conductivity of 10 -9 S / cm is low, and the temperature is high. It exhibits affinity. Therefore, the niobium oxide film inhibits the electrochemical decomposition reaction between the negative electrode active material and the electrolyte. It inhibits. On the other hand, the lithium diffusion coefficient of niobium oxide is 10 -9 cm 2 / sec, high It has lithium ion conductivity. Therefore, it is possible to pass lithium ions through it. Yes, it is possible to use silicon oxide or aluminum oxide.

[0068] For forming the coating that covers the negative electrode active material, for example, the sol-gel method can be used. - The gel method involves hydrolysis and polycondensation reactions in solutions consisting of metal alkoxides, metal salts, etc. This method involves creating a gel that has lost its fluidity, and then firing this gel to form a thin film. The gel method is a method of forming a thin film from a liquid phase, so the raw materials must be mixed homogeneously at the molecular level. This can be achieved. For this reason, a negative electrode active material such as graphite is added to the raw material of the metal oxide film at the solvent stage. This allows the active material to be easily dispersed in the gel. In this way, the negative electrode active material A coating can be formed on its surface. By using this coating, the decrease in the capacity of the energy storage device can be prevented. It can be prevented.

[0069] <Fabrication of electrode plates> A positive electrode active material layer 12 can be formed using a coating method or the like. For example, the positive electrode active material and A positive electrode paste (slurry) is prepared by mixing indium and a conductive additive. The positive electrode current collector 11 is constructed A positive electrode paste is applied to both sides of a foil made of a conductive material (for example, aluminum foil), and then dried. The aluminum foil on which the positive electrode active material layer 12 is formed is processed. This processing is, for example, A punching machine can be used. The positive electrode plate 111 can be manufactured through the above process. The negative electrode plates 120 and 121 can be manufactured in the same manner. The negative electrode current collector 21 can be made of, for example, copper. Foil can be used. When forming the negative electrode plate 120, apply negative electrode paste to one side of the copper foil. When forming the negative electrode plate 121, negative electrode paste is applied to both sides of the copper foil.

[0070] <Separator> As shown in Figure 9, the separator 130 consists of a sheet 3 made of an insulator that has been folded in half. It can be manufactured from scratch. Sheet 30 is made of polypropylene (PP) and polyethylene. (PE), polybutene, nylon, polyester, polysulfone, polyacrylonitrile Using a sheet made of a porous insulator such as polyvinylidene fluoride or tetrafluoroethylene. It is also possible to use insulating fibers (glass fibers, polymer fibers, cellulose). A formed nonwoven fabric can be used. In addition, sheet 30 is made by laminating multiple sheets. A sheet would also be acceptable. Alternatively, the surface could be coated with a resin material to improve heat resistance and hydrophilicity. This is also acceptable. The thickness of sheet 30 may be, for example, 10 μm or more and 50 μm or less.

[0071] Referring to Figure 9, an example of a method for manufacturing the separator 130 that covers the positive electrode plate 111 will be explained. A fold 30a is formed in sheet 30 (Figure 9A). The positive electrode plate 111 is placed on top of sheet 30. (Figure 9B). Next, fold sheet 30 along crease 30a, and sandwich the positive electrode plate 111 between sheets 30. (Figure 9C). As a result, both sides (top and bottom) of the positive electrode plate 111 are covered with the sheet 30. This is the state. Here, in order to maintain this state, the area where sheet 30 overlaps (positive plate) The sheets 30 are joined together at the left and right outer edges of 111. The method of joining the sheets 30 is by heating Examples of bonding methods include welding, ultrasonic bonding, and adhesive bonding. The electrolyte 103 and other materials should be selected as appropriate.

[0072] The separator 130 is completed through the above process. The separator 130 is bag-shaped or envelope-shaped. It can be called a rope-shaped insulating sheet 30. The joints 31 and 32 are formed Therefore, the separator 130 can be brought into close contact with the positive electrode plate 111. This prevents the positive electrode plate 111 from shifting away from the 130. Also, the separator 1 This can prevent wrinkles from forming at age 30.

[0073] In the example in Figure 9, a separator was formed from one sheet, but a separator can be formed from two sheets. It is also possible to form this. The positive electrode plate 111 is sandwiched between two sheets 30 (Figure 10A). 2 sheets By joining the sheets 30, the separator 131 is completed (Figure 10B). In this example, the separator 131 has joints 31 and 32 formed on it, similar to the separator 130. Furthermore, a joint portion 33 is formed in the portion of the sheet 30 corresponding to the fold 30a in Figure 9A. It is.

[0074] The joint formed to make the sheet 30 into an envelope (bag) shape is shown in Figure 9D. The configuration is not limited to that shown in Figure 10B. The positive electrode plate 111 may be one or two sheets 30. The separators 130 and 131 should be fabricated so that they are covered by the material. See Figure 11 below. Next, we will explain some configuration examples. For example, in separator 130, tab 11a and To ensure that no openings remain in the outer periphery (the left and right outer periphery of sheet 30), excluding the overlapping area, Joints 31 and 32 can be formed (Figure 11A). Also, separator 130 It is possible to form joint portions 31 and 32 on the outer periphery such that an opening 35 exists in part of it. Yes (Figure 11B).

[0075] By covering both the positive and negative electrode plates with a separator, the effectiveness of preventing short circuits between the electrode plates is improved. In this case, the insulating sheets that make up the separator can be made different for the positive and negative electrodes. It is possible. For example, in negative electrodes, a nonwoven fabric such as cellulose is used to remove precipitates. A Parator is used. The positive electrode is made of a porous resin sheet with a shutdown function. A separator is used. This improves the safety of the energy storage device.

[0076] By covering one of the positive / negative electrode plates with a separator, both the positive and negative electrode plates are covered with a separator. Rather, the energy storage body can be made thinner and lighter. For example, the charging and discharging of the energy storage body after manufacturing Gas may be generated during the aging process. In this case, to facilitate gas release... Therefore, the electrode plate that is more prone to gas generation should not be covered with a separator. For example, When using the 300 energy storage device, repeated charging and discharging can cause deposits that degrade its characteristics. This can occur. In this case, to more effectively prevent short circuits between the positive and negative electrodes... Therefore, the electrode plate that is more prone to precipitate formation should be covered with a separator. For example, lithium In the case of lithium-ion secondary batteries, lithium whiskers may form on the negative electrode plate. A configuration in which the negative electrode plate is covered with a separator is preferred.

[0077] <Electrode laminates, encapsulants> Next, negative electrode plates (120, 121) and positive electrode plates (111) are stacked alternately, and multiple electrode plates are included. An electrode stack is formed. In this embodiment, a sealant 104 is formed in the electrode stack. A member for this purpose is provided between adjacent positive electrode plates, and a member for forming the seal 105 is provided. It is placed between the electrode plate and the negative electrode plate. Here, as an example, the sealants 104 and 105 are made of an insulator. An example of formation using fusion tape will be explained.

[0078] Before stacking the electrode plates (111, 120, 121), attach fusion tape to each electrode plate. Here, we will explain how to attach fusion tape using the positive electrode plate 111 as an example. The same applies to 0 and 121). As shown in Figure 12A, the fusion tape 50 is envelope The rope-shaped separator 130 is attached to the positive electrode plate 111 so as to overlap with the open end. It is attached to the tab 11a and the separator 130. In the positive electrode plate 111, It is preferable that the positive electrode active material layer 12 is not formed in the portion that overlaps with the fusion tape 50. Figure 12A shows an example of attaching fusion tape 50 to one side of the positive electrode plate 111. Both sides of plate 111 are shown. Also, as shown in Figures 12B and 12C, the positive electrode plate 111 The fusion tape 50 can also be attached to both sides. Alternatively, one side of the positive electrode plate 111, Two or more layers of fusion tape 50 can be attached to both sides. Positive electrode plate 111, sheet 30, And depending on the thickness of the fusion tape 50, the method of attaching the fusion tape 50 can be determined. Yes, it is possible. The top and bottom electrode plates of the electrode stack are fitted with fusion tape on both sides. This allows the gap between the outer casing and the electrode plate tab to be filled with a sealant.

[0079] As shown in Figure 13A, electrode plates (111, 120, 121) with fusion tape 50 attached. These are stacked. Here, fusion tape 50 is applied to both sides of the top electrode plate (111, 120). They are attached so that tabs 11a and tabs 21a overlap, and the negative electrode plate (120, 12 1) and the positive electrode plate (111) are stacked alternately to create an electrode stack 180 (Figure 13B). In the polar laminate 180, the fusion tapes 50 attached to the tabs 11a are fused together. The sealing body 104 is formed. The fusion tapes 50 attached to the tabs 21a fuse together. This process forms the sealant 105.

[0080] Furthermore, as shown in Figure 14, fusion tape is applied to the sealant 104 and sealant 105, respectively. The fusion tape 51 may be attached. The fusion tape 51 constitutes the sealant 104 and the sealant 105. This will result in the fusion tape 51 being attached to either the sealant 104 or the sealant 105. It is also possible. As for the fusion tapes 50 and 51, the adhesive part is made of synthetic rubber or other insulating and protective materials. A tape made of a water-based material can be used.

[0081] The components constituting the sealing body 104 and sealing body 105 are not limited to the fusion tape 50. The gaps between two adjacent current collectors (tabs), and between the current collectors (tabs) and the outer casing, are filled, and the current A component or material made of an insulator that can form seals 104 and 105 to prevent leakage of the dissolving solution. Anything like that would be fine. For example, an insulating sealant can be used. When using a fluid material, the material may be applied to the electrode plate in advance. Furthermore, the electrode plates can be laminated while the material is applied to them.

[0082] <Exterior> The electrode laminate 180 is sealed inside the outer casing 107. In this sealing process, tabs 11a, 21 The outer casing 107 is formed such that a is exposed to the outside of the outer casing 107. Here, one The outer casing 107 is formed by folding the film 70 and shaping it into a bag (Figures 15, 1 6) The film 70 for forming the exterior body 107 is a metal film (aluminium Plastic films made from organic materials (such as stainless steel and nickel steel), organic materials Hybrid material fill containing organic resins and fibers and inorganic materials (ceramics, etc.) Choose from aluminum and carbon-containing films (carbon film, graphite film, etc.). A single-layer film that can be exposed can be used. Also, these films can be used as film 70. A laminated film made by stacking multiple layers can be used. As film 70, the recess and A film with a convex / or protruding portion may be used. This allows the film 70 to Because the surface area of ​​the material increases, the heat dissipation effect of the outer casing 107 can be enhanced. Alternatively, the formation of the protrusions can be done, for example, by embossing.

[0083] If the energy storage body 300 deforms, bending stress is applied to the outer casing 107, causing wrinkles and other damage to some parts of it. Deformation or breakage may occur. By forming recesses and / or protrusions on the outer casing 107 This makes it possible to alleviate the strain caused by stress in the outer casing 107. This can improve the reliability of the energy storage unit 300. Strain is the reference (initial state) length of an object. This is a measure of deformation that indicates the displacement of a material point within an object relative to a given value.

[0084] To form the outer casing 107, the film 70 is folded to match the outer shape of the electrode laminate 180. Bending or forming a recess (convex part). Here, as shown in Figure 15A, film 7 A fold 70a is formed at 0. Then, the electrode laminate 180 is placed on top of the film 70 (Figure 1). 5B) Fold the film at crease 70a (Figure 15C). For example, by heat sealing, The outer periphery of the film 70 is joined to form the outer casing 107. In this process, the electrolyte 103 The joint portion 71 of the film 70 is formed so as to leave the inlet 72 (Figure 16A). In this process, the film 70 is bonded to the sealants 104 and 105, so the electrode laminate 180 is bonded to the film. It will be fixed to Room 70 (exterior body 107).

[0085] Figure 16A shows that the joint portion 71 is formed in two places, upper and lower, around the exterior body 107. The left side of 107 is shown as an open end with an inlet 72, illustrating a manufacturing example. In some cases, such as when the size is large, the left side of the outer casing 107 may be as shown in Figure 16B. An inlet 72 can also be formed in part.

[0086] <Terminal section> The tabs 11a and tabs 11b that are brought out to the outside of the outer casing 107 are electrically connected to each other. It is connected to form the terminal portion 101a of the positive electrode 101 and the terminal portion 102a of the negative electrode 102. (Figures 1, 3, etc.). These electrical connections are best made by ultrasonic welding. Also, terminal section 1 The formation of 01a and terminal portion 102a takes place before sealing the electrode laminate 180 with the outer casing 107. It is possible to do so.

[0087] In the example in Figure 3, the leftmost positive electrode plate 11 is used to form the terminal portion 101a of the positive electrode 101. Tab 11a (positive electrode current collector 11) is used as the reference for alignment. This tab 11 By bending tab a without bending the other two tabs 11a to the left, the three tabs 11a are connected. The terminal portion 101a is formed by joining the parts. Similarly, the terminal portion 102a of the negative electrode 102 is formed in the same way. Yes. The tab 21a (negative electrode current collector 21) of the leftmost negative electrode plate 120 is left unbent, and the other three By bending the tabs 21a to the left, the four tabs 21a are joined together to form the structure. In this example, the two right tabs 11a are separated from the fixing portion of the sealant 104, and the tabs 11a are separated from each other. The joint has a roughly S-shaped, roughly arc-shaped, or bow-shaped curved section. The three tabs 21a on the right extend from the joint between the tabs 21a to the fixing portion by the sealant 105. It has a roughly S-shaped, roughly arc-shaped, or bow-shaped curved portion. Of course, tab 11a The curved shape of 21a is not limited to the example shown in Figure 3.

[0088] In order to form the curved portion in this way, the tabs 11a and 21a are each By joining them, the energy storage body 300 can be made more resistant to bending. In particular, Strong against deformation of the outer casing 107 that stretches the curved portions of the 11a and 21a. This forms the structure. In the method shown in Figure 3, the right-side plane of the exterior body 107 is made convex (Figure 2 In the illustrated method, the outer casing 107 is bent or flexed so that the upper side is convex. It has a structure that is particularly strong against deformations such as this. Therefore, the energy storage unit 300 is As shown in 7407 (Figure 20C), it is suitable for energy storage devices in electronic equipment that can be bent in one direction. Yes. Also, the energy storage body 300 is bent, as shown in the energy storage body 7104 (Figure 20E). It is suitable for energy storage bodies that are incorporated into a housing in a flexible state. That is, energy storage body 300 It is suitable for use as an energy storage material in bent electronic devices.

[0089] <Electrolyte> Under reduced pressure or inert gas atmosphere, the electrolyte 103 is introduced from the inlet 72 into the outer casing 107 The electrolyte solution 103 is injected into the interior of the separator 130, causing it to become impregnated with the electrolyte solution 103.

[0090] As the electrolyte 103, an aprotic organic solvent is preferred, for example, ethylene carbonate T (EC), propylene carbonate (PC), butylene carbonate, chloroethylene Carbonate, vinylene carbonate, γ-butyrolactone, γ-valerolactone, dimethyl Diethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate EMC (EMC), methyl formate, methyl acetate, methyl butyrate, 1,3-dioxane, 1,4- Dioxane, dimethoxyethane (DME), dimethyl sulfoxide, diethyl ether, Methyl diglyme, acetonitrile, benzonitrile, tetrahydrofuran, sulfolane Use one of the following: sultone, or two or more of these in any combination and ratio. It is possible.

[0091] Furthermore, by using a polymer material that gels as the solvent for the electrolyte 103, leakage can be addressed. 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. Examples include polyethylene oxide, polypropylene oxide, and fluorinated polymers.

[0092] Furthermore, the solvent for the electrolyte 103 is an ionic liquid (a room-temperature molten salt) that is flame-retardant and non-volatile. By using one or more of these devices, the internal temperature of the energy storage device may rise due to internal short circuits or overcharging. This also prevents the battery storage system from rupturing or catching fire.

[0093] Furthermore, when lithium ions are used as the carrier in the electrolyte dissolved in the above solvent, for example... For example, LiPF6, LiClO4, LiAsF6, LiBF4, LiAlCl4, LiSC N, LiBr, LiI, Li2SO4, Li2B 10 Cl 10 Li2B 12 Cl 12 , LiCF3SO3, LiC4F9SO3, LiC(CF3SO2)3, LiC(C2F5 SO2)3, LiN(CF3SO2)2, LiN(C4F9SO2)(CF3SO2), One lithium salt such as LiN(C2F5SO2)2, or two or more of these as appropriate. It can be used in combinations and ratios.

[0094] The electrolyte 103 contains particulate matter and elements other than the constituent elements of the electrolyte (hereinafter also simply referred to as "impurities"). It is preferable to use a highly purified electrolyte with a low content of ( ). Specifically, The weight ratio of impurities to the electrolyte is 1% or less, preferably 0.1% or less, more preferably 0% It is preferable to keep the concentration below 0.01%. In addition, vinylene carbonate or the like may be added to the electrolyte 103. Additives may be added.

[0095] <Aging Process> The inlet 72 is temporarily sealed. Next, to make the energy storage unit 300 usable, The aging process is performed. The aging process involves, for example, one or more cycles of charging and discharging. When charging the power storage body 300, a part of the electrolytic solution 103 may decompose and gas may be generated. Therefore, after completion of the aging process, the inlet 72 (FIG. 16) is unsealed to vent the gas generated inside the exterior body 107.

[0096] <Completion of the power storage body> After venting the gas, the electrolytic solution 103 may be replenished. Also, the aging process and the gas venting process may be performed two or more cycles. By sealing the inlet 72, the power storage body 300 in a practically usable state is completed (FIG. 1).

[0097] As shown in FIGS. 1 to 5, by configuring the positive / negative electrode plates (111, 120, 121) to be fixed to the exterior body 107 together with the separator 1 30, the power storage body 300 can be made resistant to bending. When the exterior body 107 is deformed by bending or the like, accordingly , each electrode plate (111, 120, 121) slides inside the exterior body 107 together with the separator 130, so that the stress caused by the deformation of the exterior body 107 applied to the electrode plates (111, 120, 121) is relaxed. Also, the current collectors (11, 21) of the electrode plates (111, 120, 121) are connected outside the exterior body 107, and inside, except at the fixed portions by the sealing bodies 104, 105, the current collectors (11, 21) do not have fixed portions. For this reason, since the electrode plates (111, 120, 121) are more likely to move inside the exterior body 107, the stress applied to the electrode plates (111, 120, 121) due to the deformation of the exterior body 10 7 can be more effectively relaxed. The power storage body 300 having a structure resistant to deformation such as bending also leads to an improvement in the safety of the power storage body 300.

[0098] In addition, the tabs 11a of the positive electrode current collector 11 and the tabs 21a of the negative electrode current collector 21 do not have notch portions, and thus are less likely to be damaged than current collectors having a structure with notch portions. This also contributes to improving the strength of the structure of the power storage body 3 00. Incidentally, it is also possible to provide a notch portion in one or both of the tabs 11a and 21a. When a notch portion is provided, the tabs 11a and 21 a can be taken out from the same side surface of the exterior body 107. For example, in FIG. 1, the tab 11a may be taken out from the upper side surface of the exterior body 107, which is the same as that of the tab 21a.

[0099]

[0100] It is also preferable to use separators 130 and 131 that are processed into a bag shape or an envelope shape. Thereby, even if the electrode plates (111, 120, 121) move inside the exterior body 107, they are less likely to deviate from the separator 130, so that a short circuit between the positive electrode 10 1 and the negative electrode 102 is prevented, and the safety of the power storage body 300 is improved. <<Configuration Example 2 of Power Storage Body>> In FIG. 1 and the like, a configuration example of a power storage body in which both the positive electrode plate and the negative electrode plate are covered with a separator is shown. However, a configuration in which either the positive electrode plate or the negative electrode plate is covered with a separator and the other is not covered can be adopted. An example of such a configuration is shown in FIGS. 17 and 18. FIGS. 17 and 18 show a power storage body 301, which is a modified example of the power storage body 300. The plan view of the power storage body 301 corresponds to FIG. 1, and FIGS. 17 and 18 are cross-sectional views showing a configuration example of the power storage body 301, and are cross-sectional views of FIG. 1 taken along lines A1-A 2 and B1-B2, respectively.

[0101]

[0102] 0, 121) is not covered with a separator.

[0103]

[0104]

[0105]

[0106]

[0107]

[0108] 0, 121) are not covered by separator 130. Of course, the positive electrode plate 111 is separated The negative electrode plates (120, 121) are not covered by separator 130, and the negative electrode plates are covered by separator 130. It is also possible.

[0102] <<Example of a power storage system configuration 3>> Figure 19 shows another example of the configuration of the energy storage body. The energy storage body 302 shown in Figure 19 is a variation of the energy storage body 300. This is an example, and the structure of the positive and negative terminals differs from that of the energy storage body 300 (Figure 3). Energy storage body 30 The plan view in Figure 2 corresponds to Figure 1, and Figure 19 is a cross-sectional view showing an example of the configuration of the energy storage unit 302. This is a cross-sectional view along the line B1-B2.

[0103] As shown in Figure 3, in the energy storage body 300, the terminal portion 101a of the positive electrode 101 is located on the far left. The tab 11a of the positive electrode current collector 11 is used as a reference for alignment. By bending tab a without bending the other two tabs 11a to the left, adjacent tabs 11a The three tabs 11a are joined together in this state by making contact with each other. Also, the terminals of the negative electrode 102 The same applies to part 102a, where the tab 21a of the leftmost negative electrode current collector 21 is the base for alignment. It is used in the same way. This tab 21a is not bent, but the other three tabs 21a are bent to the left. By doing so, adjacent tabs 21a are brought into contact with each other, and in this state, the four tabs 21a are joined together. They are doing it.

[0104] The terminals 101a and 102a of the energy storage body 300 have an asymmetrical structure. Furthermore, for deformation of the exterior body 107 such that the right side is curved in a convex shape as shown in Figure 3, It has a strong structure. On the other hand, the deformation of the outer casing 107, which curves in a concave shape on the right side, It has a relatively weak structure. Therefore, the power storage body 302 (FIG. 19) has terminal portions 101a and 102a with a highly symmetrical structure, so that whether the exterior body 107 is convex or concave, the terminal portions 101a and 102a have the same strength against bending. Therefore, compared with the power storage body 300, the power storage body 302 is more suitable for the power storage body of an electronic device that can be bent in two directions, concave and convex.

[0105] In the power storage body 302 shown in FIG. 19, in order to form the terminal portions 101a and 102a, the central electrode plate of the plurality of electrode plates sealed in the exterior body 10 7 is used as a reference for alignment, and the tabs (11a, 21a) of the other electrode plates are bent. Here, the positive electrode current collector 11 of the second positive electrode plate 111 from the right serves as the reference for alignment. In the terminal portion 101a of the positive electrode 101, without bending the central tab 11a, one tab 11a on the right is bent leftward, and one tab 11a on the left is bent rightward, so that the adjacent tabs 11a are brought into contact with each other, and in this state, the three tabs 11a are joined together. In the terminal portion 102a of the negative electrode 102, two tabs 21a on the right are bent leftward, and two tabs 21a on the left are bent rightward, so that the adjacent tabs 21a are brought into contact with each other, and in this state, the four tabs 21a are joined together.

[0106] (Embodiment 2) The power storage body according to one embodiment of the present invention can be used as a power source for various electronic devices driven by electric power. FIGS. 20 to 23 show examples of electronic devices using the power storage body according to one embodiment of the present invention.

[0107] ​​​​​​​​​An electronic device using a power storage body according to one embodiment of the present invention includes a display device such as a television or monitor, and a lighting device. Lighting devices, desktop or notebook personal computers, word processors, Recorded on recording media such as DVDs (Digital Versatile Discs) Image playback devices for playing still images or videos, portable CD players, radios, tape recorders Headphone stereo, stereo, desk clock, wall clock, cordless phone handset, etc. Lanceivers, mobile phones, car phones, portable game consoles, tablet information terminals, pachinko Large game consoles such as machines, calculators, personal digital assistants, electronic organizers, e-readers, electronic translators, sound High frequency input devices such as voice input devices, video cameras, digital still cameras, electric shavers, and microwave ovens. Wave heating device, electric rice cooker, electric washing machine, electric vacuum cleaner, water heater, electric fan, hair dryer, air Air conditioning equipment such as conditioners, humidifiers, and dehumidifiers, dishwashers, dish dryers, and clothes dryers. Dishes, futon dryers, electric refrigerators, electric freezers, electric refrigerator-freezers, DNA storage freezers, pockets Examples include electric lights, tools such as chainsaws, smoke detectors, and medical equipment such as dialysis machines. This includes emergency lights, traffic lights, conveyor belts, elevators, escalators, industrial robots, and electric vehicles. Examples include industrial equipment such as energy storage systems, power leveling systems, and energy storage devices for smart grids. It can also be powered by an engine using fuel, or by an electric motor using electricity from a non-aqueous secondary battery. Mobile devices that propel themselves are also included in the category of electronic devices. Examples of such mobile devices include: For example, electric vehicles (EVs), hybrid electric vehicles (HEVs) that combine internal combustion engines and electric motors, Plug-in hybrid vehicles (PHEVs), and tracked vehicles that replace their tires and wheels with tracks. This includes motorized bicycles (including electric-assist bicycles), motorcycles, electric wheelchairs, and golf carts. Small or large vessels, submarines, helicopters, aircraft, rockets, satellites, space exploration Examples include aircraft, planetary probes, and spacecraft.

[0108] Furthermore, the energy storage body according to one embodiment of the present invention can be used in the interior or exterior walls of houses and buildings, or in the interior of automobiles. Alternatively, it can be incorporated along the curved surface of the exterior.

[0109] Figure 20A shows an example of a mobile phone (or smartphone). The 7400 includes a display unit 7402 built into the housing 7401, as well as operation buttons 7403 and external It is equipped with a port 7404, speaker 7405, microphone 7406, etc. The 7400 band telephone has a battery storage unit 7407.

[0110] Figure 20B shows the mobile phone 7400 in a curved state. When deformed by an external force and the entire structure is bent, the energy storage unit 740 located inside it 7 is also curved. Figure 20C shows the battery storage 7407 with the mobile phone 7400 curved. This indicates.

[0111] Figure 20D shows an example of a bangle-type display device. The portable display device 7100 has a housing. It comprises 7101, a display unit 7102, an operation button 7103, and a battery storage unit 7104. Figure 20E shows the energy storage unit 7104 as it is incorporated into the housing 7101. As shown, the energy storage unit 7104 is housed inside the casing 7101 in a bent state.

[0112] Figure 20F shows an example of a wristwatch-type personal information terminal. The personal information terminal 7200 is housed in a casing. Body 7201, display unit 7202, band 7203, buckle 7204, operation buttons 7205 It is equipped with input / output terminals 7206, etc. The portable information terminal 7200 is a mobile phone, email, Various functions such as document viewing and creation, music playback, internet communication, and computer games. The application can be executed.

[0113] The display unit 7202 has a curved display surface, and displays are made along the curved display surface. Yes, it is possible. Additionally, the display unit 7202 is equipped with a touch sensor, allowing you to touch the screen with your finger or a stylus. It can be operated by doing so. For example, the icon 7207 displayed on the display unit 7202 You can launch the application by touching it.

[0114] The 7205 control button is used for setting the time, turning the power on and off, and turning wireless communication on and off. It has various functions such as operation, silent mode activation and deactivation, and power saving mode activation and deactivation. This can be done. For example, the operation system incorporated into the mobile information terminal 7200 The system also allows you to freely configure the function of the control button 7205.

[0115] Furthermore, the personal information terminal 7200 is capable of performing standardized short-range wireless communication. Yes, for example, by communicating with a wireless headset, hands-free operation is possible. You can also make phone calls.

[0116] Furthermore, the portable information terminal 7200 is equipped with an input / output terminal 7206, and can connect to other information terminals via a connector. This allows for direct data exchange. Furthermore, charging can be performed via the input / output terminal 7206. It can also be done. Note that charging is performed wirelessly without using input / output terminal 7206. That's fine.

[0117] The portable information terminal 7200 has a power storage device. For example, the power storage device 710 shown in Figure 20E 4 is curved inside the housing 7201, or can be curved inside the band 7203. It can be incorporated in its current state.

[0118] Figure 20G shows an example of an armband-type display device. The display device 7300 is a display unit 730 It has 4 and has an energy storage body such as the energy storage body 7104 of one embodiment of the present invention. The unit 7300 can also be equipped with a touch sensor on the display unit 7304, and can also be used as a portable information terminal. It can also be used as such.

[0119] The display unit 7304 has a curved display surface, and displays are made along the curved display surface. Yes, it is possible. Furthermore, the display device 7300 can communicate via standardized short-range wireless communication, etc. The situation can be changed.

[0120] Furthermore, the display device 7300 is equipped with input / output terminals and can directly exchange data with other information terminals via connectors. It can exchange data. It can also be charged via input / output terminals. Oh, charging can also be done wirelessly without using input / output terminals.

[0121] Figures 21A and 21B show an example of a foldable tablet-type information terminal. Figure A shows the tablet-type information terminal 9600 in an open state, and Figure 21B shows the tablet-type information This shows the information terminal 9600 in a closed state. The tablet-type information terminal 9600 has a casing 96 30a, housing 9630b, movable part 9640 connecting housing 9630a and housing 9630b, Display unit 9631 having display unit 9631a and display unit 9631b, display mode switching switch Switch 9626, Power switch 9627, Power saving mode switch 9625, Fastener It has 9629, an operating switch 9628, etc.

[0122] The tablet-type information terminal 9600 has a power storage unit inside the housing 9630a and housing 9630b. It has 9635. The energy storage unit 9635 passes through the movable part 9640 and the housing 9630a and housing 9 It is provided over 630b.

[0123] The display unit 9631a can be partially designated as a touch panel area 9632a, and the display will be Data can be entered by touching the operation key 9638. Note that the display unit 963 In 1a, as an example, one half of the area has a display-only function, and the other half of the area The diagram shows a configuration that includes touch panel functionality, but is not limited to this configuration. Display unit 963 The entire area of ​​1a may also be configured to have touch panel functionality. For example, the display unit 96 The entire surface of 31a is used as a touch panel with keyboard buttons, and the display unit 9631b is displayed. It can be used as a screen.

[0124] In the display unit 9631b, as with the display unit 9631a, a part of the display unit 9631b is tapped. The touch panel area can be set to 9632b. Also, the keyboard display on the touch panel can be turned off. By touching the location where the replacement button 9639 is displayed with your finger or stylus, the display will change. Keyboard button 9641 can be displayed on 9632b. Touch panel area 9 It is also possible to input touch input simultaneously to area 632a and the touch panel area 9632b.

[0125] The display mode switch 9626 allows you to switch between portrait and landscape display orientations. You can switch between black and white and color displays. There is also a power saving mode switch. Chi 9625 is used by the optical sensor built into the tablet-type information terminal 9600. The display brightness can be optimized according to the amount of ambient light at the time. The device uses not only a light sensor, but also other sensors that detect tilt, such as a gyroscope and accelerometer. A detection device may be built into the system.

[0126] Figure 21A shows an example where the display area of ​​display unit 9631b and display unit 9631a are the same. There are no particular limitations; one size may be different from the other, and the quality of the display may also be different. They can be different. For example, one could be a display panel that can display a higher resolution image than the other. good.

[0127] Figure 21B shows the closed state, and the tablet-type information terminal consists of a housing 9630 and a solar cell 96 33. It has a charge / discharge control circuit 9634 including a DC-DC converter 9636. Also, an energy storage unit As 9635, an energy storage body according to one embodiment of the present invention is used.

[0128] Furthermore, since the tablet-type information terminal 9600 is foldable, the casing 9630a is used when not in use. The enclosure 9630b can be folded so that it overlaps with the other components. Therefore, the display unit 9631a and the display unit 9631b can be protected, so the tablet-type information terminal 96 The durability of 00 can be increased. Also, a power storage body 96 using a power storage body according to one embodiment of the present invention 35 is flexible, and its charge / discharge capacity does not easily decrease even after repeated bending and stretching. Therefore, We can provide a highly reliable tablet-type information terminal.

[0129] The 9600 tablet-type information terminal also displays various other types of information (still images, videos, text images). Functions to display images, etc., a calendar, date or time, etc. on the display unit, display A touch input function that allows you to operate or edit the information displayed on the unit, and various software ( It can have functions such as controlling processing by a program.

[0130] The solar cell 9633 mounted on the surface of the tablet-type information terminal 9600 provides power to the tablet. It can be supplied to a switch panel, display unit, or video signal processing unit, etc. Note that the solar cell 9 633 can be provided on one or both sides of the housing 9630, and effectively charges the energy storage unit 9635. This configuration is preferable because it allows for efficient execution. Note that the energy storage element 9635 is lithium Using um-ion batteries offers advantages such as miniaturization.

[0131] Figure 21C is a block diagram showing an example of the configuration of the charge / discharge control circuit 9634. Circuit 9634 includes a battery 9635, a DC-DC converter 9636, a converter 9637, It has switches SW1, SW2, SW3, etc.

[0132] This section describes an example of the operation of the charge / discharge control circuit 9634 when the solar cell 9633 is generating power. The power generated in the battery 9633 is set to a DCD (Digital-to-Collective) voltage to charge the energy storage unit 9635. The C converter 9636 performs either a boost or a buck. Then, the display unit 9631 operates in accordance with the solar power. When power from battery 9633 is used, switch SW1 is turned ON, and converter 96 At step 37, the voltage is increased or decreased to the voltage required for the display unit 9631. Also, the display unit 96 If you do not want to display on 31, turn SW1 off and turn SW2 on and then turn on the battery storage 9635 The configuration should be such that it charges the device.

[0133] Here, an example of the use of solar cell 9633 as an example of a power generation method is shown, but it is not particularly limited Instead, other power generation methods such as piezoelectric elements (piezoelectric elements) and thermoelectric elements (Peltier elements) are used. The configuration may also involve charging the energy storage unit 9635 by wireless (contactless) power A contactless power transmission module that sends and receives signals for charging, or a combination of other charging methods. This configuration is also acceptable.

[0134] Figure 22 shows examples of other electronic devices.

[0135] The display device 8000 is an example of an electronic device using a power storage body 8004 according to one embodiment of the present invention. Specifically, the display device 8000 corresponds to a display device for receiving TV broadcasts, and the housing 8001 It has a display unit 8002, a speaker unit 8003, a power storage unit 8004, etc. In one embodiment of the present invention The energy storage unit 8004 is located inside the housing 8001. The display device 8000 is a commercial It can receive power from a power source, or it can use the power stored in the energy storage unit 8004. It is also possible to do so. Therefore, even when power cannot be supplied from the commercial power source due to a power outage, By using the energy storage body 8004 according to one embodiment of the present invention as an uninterruptible power supply, the display device 80 00 becomes available.

[0136] The display unit 8002 has light-emitting elements such as liquid crystal display devices and organic EL elements in each pixel. Equipment, electrophoresis display device, DMD (Digital Micromirror Display) ce), PDP (Plasma Display Panel), FED (Field Display devices such as Emission Displays can be used.

[0137] In addition to being used for receiving TV broadcasts, display devices are also used for personal computers, advertising displays, and more. This includes all information display devices.

[0138] The fixed-type lighting device 8100 is an electronic device using a power storage body 8103 according to one embodiment of the present invention. This is an example of a device. Specifically, the lighting device 8100 consists of a housing 8101, a light source 8102, and a power storage unit. It has 8103, etc. Figure 22 shows the energy storage body 8103, the housing 8101 and the light source 8102. The example shows the case where it is installed inside the ceiling 8104, but the energy storage unit 81 03 may be located inside the housing 8101. The lighting device 8100 is powered by commercial power or It can receive power from the power supply, or it can use the power stored in the energy storage unit 8103. Yes, it is possible. Therefore, even when power cannot be supplied from the commercial power source due to a power outage, the energy storage system By using 8103 as an uninterruptible power supply, the lighting device 8100 can be used.

[0139] Figure 22 illustrates a fixed lighting device 8100 installed on the ceiling 8104. In one embodiment of the present invention, the energy storage body is located in a location other than the ceiling 8104, for example, the side wall 8105, the floor 8106 It can also be used in fixed lighting fixtures installed in windows 8107, etc., or in tabletop lighting fixtures. It can also be used in lighting devices, etc. Furthermore, the light source 8102 uses electricity to artificially emit light. Artificial light sources can be used to obtain the desired result. Examples of artificial light sources include incandescent bulbs, fluorescent lamps, and other discharge lamps. Examples include lamps, light-emitting elements such as LEDs and organic EL elements.

[0140] An air conditioner having an indoor unit 8200 and an outdoor unit 8204 is one embodiment of the present invention. This is an example of an electronic device using the energy storage unit 8203. Specifically, the indoor unit 8200 is a housing It has 8201, an air outlet 8202, a power storage unit 8203, etc. In Figure 22, the power storage unit 8203 is The example shows the case where it is installed in the indoor unit 8200, but the energy storage unit 8203 is installed in the outdoor unit 82 It may also be provided in 04. Alternatively, both the indoor unit 8200 and the outdoor unit 8204 may have energy storage. Body 8203 may be provided. The air conditioner is powered by commercial power. It can receive power, or it can use the power stored in the energy storage unit 8203. If both the indoor unit 8200 and the outdoor unit 8204 are equipped with a power storage unit 8203, then during a power outage... Even when power cannot be supplied from the commercial power source due to the above, the energy storage system according to one embodiment of the present invention By using the 8203 as an uninterruptible power supply, it becomes possible to use an air conditioner.

[0141] Figure 22 illustrates a separate-type air conditioner consisting of an indoor unit and an outdoor unit. However, integrated air conditioners that have both indoor and outdoor unit functions in a single housing... A storage body according to one embodiment of the present invention can also be used as the condenser.

[0142] The electric refrigerator 8300 is an electronic device using a power storage body 8304 according to one embodiment of the present invention. This is an example. Specifically, the electric refrigerator-freezer 8300 consists of a casing 8301, a refrigerator door 8302, It has a freezer door 8303, a power storage unit 8304, etc. The power storage unit 8304 is located inside the housing 8301. It is located in the section. The electric refrigerator / freezer 8300 receives power from the commercial power supply. It can also use the power stored in the energy storage unit 8304. Therefore, in the event of a power outage, Therefore, even when power cannot be supplied from the commercial power source, the energy storage body 83 according to one embodiment of the present invention By using 04 as an uninterruptible power supply, the 8300 electric refrigerator / freezer can be used.

[0143] Of the electronic devices mentioned above, high-frequency heating devices such as microwave ovens and electric rice cookers are not included. The equipment requires high power in a short period of time. Therefore, it is necessary to supplement the power that cannot be supplied by the commercial power supply. By using an energy storage device according to one embodiment of the present invention as an auxiliary power source for the use of electronic devices, Sometimes it can prevent the commercial power circuit breaker from tripping.

[0144] Furthermore, during periods when electronic devices are not in use, especially the total amount of electricity that can be supplied by the commercial power source... During periods when the proportion of electricity actually used (called the electricity usage rate) is low, energy storage is used. By storing energy in the body, it is possible to suppress the increase in electricity usage outside of the above-mentioned time period. This is possible. For example, in the case of the electric refrigerator-freezer 8300, when the temperature is low, the refrigerator door 8302 During nighttime hours when the freezer door 8303 is not opened or closed, power is stored in the energy storage unit 8304. Then, as the temperature rises, the refrigerator door 8302 and the freezer door 8303 are opened and closed. During the daytime, using the 8304 energy storage unit as an auxiliary power source reduces the daytime power consumption rate. It can be suppressed.

[0145] An energy storage device according to one embodiment of the present invention can be used as a power source for an electric motor. Figure 23 shows an example of an electronic device equipped with a motor and a battery. When the battery is mounted on a vehicle, Hybrid electric vehicles (HEVs), electric vehicles (EVs), or plug-in hybrid vehicles (PH This will enable the realization of next-generation clean energy vehicles (EVs), etc.

[0146] The automobile 8400 shown in Figure 23A uses an electric motor as the power source for driving. It is an automobile. Or, it uses an electric motor and an engine as appropriate as power sources for driving. It is a hybrid vehicle that can be used in this way. The storage incorporated in the vehicle 8400 The electrical unit not only drives the electric motor, but also the headlights 8401 and the room lights (see diagram). It can supply power to light-emitting devices such as (without) 8400. It can supply power to display devices such as speedometers and tachometers. Furthermore, the energy storage device is used in semiconductor devices such as the navigation system of the automobile 8400. It can supply electricity.

[0147] The automobile 8500 shown in Figure 23B has a plug-in or non- This configuration allows the device to be charged by receiving power from an external charging facility using a contact power supply method or the like. It has. Figure 23B shows the ground-mounted charging device 8021 mounted on the automobile 8500. This shows the state in which the energy storage unit is being charged via cable 8022. During charging, The electrical method and connector standards will be as appropriate, using the prescribed methods such as CHAdeMO® or Combo. It is fine to do so. The charging device 8021 may be a charging station installed in a commercial facility, It may also be a household power supply. For example, plug-in technology allows for external power supply. It can charge the battery installed in the 8500 car. Charging is done via AC / DC converter. This can be done by converting AC power to DC power via a converter such as a converter.

[0148] Although not shown in the diagram, a power receiving device is mounted on the vehicle, and power is supplied wirelessly from a ground-based power transmission device. It can also be charged by doing so. In this contactless power supply method, power transmission equipment is installed in roads or exterior walls. By incorporating this, charging can be performed not only when the vehicle is stopped but also while it is in motion. Furthermore, this contactless power supply... This method may be used to transmit and receive power between vehicles. Furthermore, the exterior of the vehicle Solar panels may be installed to charge the battery while the vehicle is stopped or in motion. Electromagnetic induction and magnetic resonance methods can be used for power supply.

[0149] According to one aspect of the present invention, the cycle characteristics of the energy storage device are improved, thereby enhancing reliability. This can be done. Furthermore, according to one aspect of the present invention, the characteristics of the energy storage body can be improved, and therefore This allows the energy storage unit itself to be made smaller and lighter. If the energy storage unit itself can be made smaller and lighter, the vehicle Because it contributes to weight reduction, it can improve the driving range. In addition, the battery storage installed in the vehicle The human body can also be used as a power source other than a vehicle. In this case, during peak electricity demand... This avoids the need to use commercial power. [Explanation of symbols]

[0150] 11 Positive electrode current collector 11a tab 12 Cathode active material layer 21 Negative electrode current collector 21a Tab 22 Negative electrode active material layer 30 seats 31-33 Joint 50, 51 Fusion Tape 70 film 71 Joint 72 Inlet 101 Positive electrode 101a Terminal section 102 Negative electrode 102a Terminal section 103 Electrolyte 104, 105 Sealing body 107 Exterior 110-112 Positive plate 120-122 Negative electrode plate 130, 131 Separator 180 Electrode Stack 300, 301, 302 Energy storage units

Claims

1. Exterior body and Multiple positive plates, Multiple negative plates, It comprises a plurality of separators covering each of the plurality of positive electrode plates, The aforementioned multiple negative electrode plates are not covered by a separator. A power storage body in which one of the plurality of separators and one of the plurality of negative electrode plates adjacent to the one separator can slide inside the outer casing when the outer casing is bent.

2. An electronic device having the energy storage body described in claim 1.

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