JP2015156307A - Battery, battery pack, electronic apparatus, power storage apparatus, power system, and electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery in which, when a gas is generated in an emergency, the gas is efficiently exhausted.

SOLUTION: The battery includes: a case; an electrode body accommodated in the case; and an insulation plate provided at both ends of the electrode body. At least one of the insulation plate provided at both ends has a space part from a periphery to a center.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present technology relates to a battery, a battery pack, an electronic device, a power storage device, a power system, and an electric vehicle.

  In recent years, various electronic devices such as mobile phones and personal digital assistants (PDAs) have become widespread, and further downsizing, weight reduction, and long life of the electronic devices are desired. Accordingly, as a power source, development of a battery, in particular, a secondary battery that is small and lightweight and capable of obtaining a high energy density is in progress.

  Recently, secondary batteries are not limited to the above-described electronic devices, but are also being considered for other uses. Examples of other applications are battery packs that are detachably mounted on electronic devices, electric vehicles such as electric vehicles, power storage systems such as household power servers, and electric tools such as electric drills.

  In such a secondary battery, a strong impact may be applied from the outside, or it may be accidentally dropped into the fire. Along with the recent multifunctionalization of electronic devices, high capacity cathode materials such as lithium nickelate are used, and the capacity of batteries is increasing, so the amount of gas generated when the above abnormalities occur More and more.

  Normally, the sealing plate has a gas discharge mechanism that operates when the internal pressure of the secondary battery can reaches a predetermined value, but when the amount of gas generation is large, it cannot keep up and the cell case is damaged (explosion). there's a possibility that.

  As a technique for solving these problems, by using a structure in which the upper insulating plate 12 disposed between the electrode group and the sealing plate and the center core disposed in the central portion of the electrode group are integrally formed, Some increase the strength of the central portion of the upper insulating plate 12 where gas discharge pressure is concentrated (Patent Document 1).

  In addition, the insulating plate is circular, and the thickness of the outer periphery of the circle is 130% or more and 300% or less of the thickness of the center, so that gas can be safely discharged even if the pressure in the battery rises abnormally. Some have made it possible (Patent Document 2).

JP 2013-73873 A JP2013-131430A

  However, in the technique described in Patent Document 1, it is possible to suppress the movement of the electrode group due to the breakage of the upper insulating plate 12, but the gas flow path from the element center to the sealing is ensured, Since the gas flow path from the outer periphery to the sealing is insufficient, the effect is insufficient.

  In addition, the technique described in Patent Document 2 is not effective because the gas flow path from the outer periphery to the sealing is not ensured as in the technique described in Patent Document 1.

  The present technology has been made in view of the above points, and provides a battery, a battery pack, an electronic device, a power storage device, a power system, and an electric vehicle that efficiently discharge gas when gas is generated at the time of abnormality. For the purpose.

In order to solve the above-described problem, the first technique is:
Case and
An electrode body housed in a case;
An insulating plate provided at both ends of the electrode body,
At least one of the insulating plates provided at both ends is a battery having a space portion from the outer periphery to the center or inside.

  According to the present technology, gas can be efficiently discharged when gas is generated at the time of abnormality.

It is a sectional view showing an example of 1 composition of a battery concerning a 1st embodiment of this art. It is sectional drawing which expands and represents a part of winding electrode body shown in FIG. FIG. 3A is a plan view showing a first configuration example of the upper insulating plate, and FIG. 3B is a plan view showing a first configuration example of the lower insulating plate. FIG. 3C is a plan view showing a second configuration example of the upper insulating plate, and FIG. 3D is a plan view showing a second configuration example of the lower insulating plate. 4A is a side view showing one configuration example of the gasket, FIG. 4B is a plan view showing one configuration example of the gasket, FIG. 4C is a cross-sectional view taken along the line CC in FIG. 4B, and FIG. 4D is in FIG. It is sectional drawing of DD. It is a block diagram showing an example of 1 composition of a battery pack concerning a 2nd embodiment of this art. It is a block diagram showing an example of 1 composition of an electrical storage system concerning a 3rd embodiment of this art. It is a block diagram showing an example of 1 composition of an electric vehicle concerning a 4th embodiment of this art. 8A to 8E are plan views illustrating modifications of the upper insulating plate according to the present technology. 9A to 9D are plan views illustrating modifications of the upper insulating plate according to the present technology. 10A to 10H are plan views illustrating modifications of the lower insulating plate according to the present technology. It is sectional drawing which shows the modification of the battery which concerns on this technique. It is sectional drawing which shows the modification of the battery which concerns on this technique.

  Hereinafter, embodiments of the present technology will be described with reference to the drawings. The description will be given in the following order.

1. First embodiment (example of cylindrical battery)
2. Second embodiment (example of battery pack)
3. Third embodiment (example of power storage system)
4). Fourth embodiment (example of electric vehicle)
5. Modified example

<1. First Embodiment>
Hereinafter, a configuration example of the battery according to the first embodiment of the present technology will be described with reference to the drawings. The battery according to the first embodiment and the battery pack including the battery can be used for mounting or supplying power to devices such as electronic devices, electric vehicles, and power storage devices.

Examples of the electric vehicle include a railway vehicle, a golf cart, an electric cart, and an electric vehicle (including a hybrid vehicle). The battery and the battery pack are used as a driving power source or an auxiliary power source. Examples of the power storage device include a power storage power source for buildings such as houses or power generation facilities.

[1.1 Battery configuration]
Hereinafter, a configuration example of the battery according to the first embodiment of the present technology will be described with reference to FIG. This battery is, for example, a so-called lithium ion secondary battery in which the capacity of the negative electrode is represented by a capacity component due to insertion and extraction of lithium (Li) as an electrode reactant. This battery is called a so-called cylindrical type, in which a pair of strip-like positive electrode 21 and strip-like negative electrode 22 are laminated and wound inside a substantially hollow cylindrical battery can 11 via a separator 23. An electrode body 20 is provided. The battery can 11 is made of iron (Fe) plated with nickel (Ni), and has one end closed and the other end open. Inside the battery can 11, an electrolytic solution as an electrolyte is injected and impregnated in the positive electrode 21, the negative electrode 22, and the separator 23.

  At the open end of the battery can 11, a battery lid 14, a safety valve mechanism 15 and a heat sensitive resistance element (Positive Temperature Coefficient; PTC element) 16 provided inside the battery lid 14 are provided via a sealing gasket 17. It is attached by caulking. Thereby, the inside of the battery can 11 is sealed. The battery lid 14 is made of, for example, the same material as the battery can 11. The safety valve mechanism 15 is electrically connected to the battery lid 14, and when the internal pressure of the battery exceeds a certain level due to an internal short circuit or external heating, the disk plate 15A is reversed and wound around the battery lid 14. The electrical connection with the electrode body 20 is cut off. The safety valve mechanism 15 discharges gas from the upper part of the battery by cleaving or the like when gas is generated in the battery can 11 at the time of abnormality. The sealing gasket 17 is made of, for example, an insulating material, and the surface is coated with asphalt. In the present specification, of the both ends of the cylindrical battery, the end provided with the battery lid 14 and the safety valve mechanism 15 is referred to as an upper portion (top), and the opposite end is the lower portion (bottom). That's it.

  A positive electrode lead 25 made of aluminum (Al) or the like is connected to the positive electrode 21 of the spirally wound electrode body 20, and a negative electrode lead 26 made of nickel or the like is connected to the negative electrode 22. The positive electrode lead 25 is electrically connected to the battery lid 14 by being welded to the safety valve mechanism 15, and the negative electrode lead 26 is welded to and electrically connected to the battery can 11.

  The wound electrode body 20 has a substantially cylindrical shape, and has a central space portion 31 at the center thereof. The central space 31 is a hole having, for example, an elongated substantially cylindrical shape, and penetrates from the center of the upper end surface of the spirally wound electrode body 20 toward the center of the other end surface. For example, a center pin 24 is inserted into the central space 31 of the wound electrode body 20.

  The center pin 24 has a hollow space, and the space is open at both ends of the center pin. For this reason, the central space portion 31 functions as a flow path that guides the gas to the upper part of the battery when the gas is generated in the battery can 11 at the time of abnormality.

  An outer peripheral gap 32 is provided between the outer peripheral surface of the wound electrode body 20 and the inner peripheral surface of the battery can 11. The width of the outer circumferential gap 32 is narrower than the width of the central space portion 31 and is, for example, several hundred μm or less. Here, the widths of the outer circumferential gap 32 and the central space portion 31 mean the widths of the outer circumferential gap 32 and the central space portion 31 in the radial direction of the cylindrical wound electrode body 20.

  A pair of upper insulating plate 12 and lower insulating plate 13 are arranged so as to sandwich the wound electrode body 20. The upper insulating plate 12 has a flat plate shape as a whole, and is provided in close contact with the upper portion of the wound electrode body 20 so that one main surface thereof is perpendicular to the outer peripheral surface of the wound electrode body 20. It has been. The other main surface is pressed by a sealing gasket 17. The lower insulating plate 13 is provided in close contact with the lower part of the wound electrode body 20 so that one main surface thereof is perpendicular to the outer peripheral surface of the wound electrode body 20. The other main surface is pressed against the bottom of the battery can 11.

  Hereinafter, the positive electrode 21, the negative electrode 22, the separator 23, and the electrolytic solution constituting the battery will be sequentially described with reference to FIG. 2.

(Positive electrode)
The positive electrode 21 has, for example, a structure in which a positive electrode active material layer 21B is provided on both surfaces of a positive electrode current collector 21A. Although not shown, the positive electrode active material layer 21B may be provided only on one surface of the positive electrode current collector 21A. The positive electrode current collector 21A is made of, for example, a metal foil such as an aluminum foil. The positive electrode active material layer 21B includes, for example, one or more positive electrode materials capable of occluding and releasing lithium as a positive electrode active material, and a conductive agent such as graphite and polyfluoride as necessary. It is configured to contain a binder such as vinylidene.

As the positive electrode material capable of inserting and extracting lithium, for example, lithium-containing compounds such as lithium oxide, lithium phosphorous oxide, lithium sulfide, or an intercalation compound containing lithium are suitable. May be used in combination. In order to increase the energy density, a lithium-containing compound containing lithium, a transition metal element, and oxygen (O) is preferable. Examples of such a lithium-containing compound include a lithium composite oxide having a layered rock salt structure shown in Formula (A) and a lithium composite phosphate having an olivine structure shown in Formula (B). Can be mentioned. It is more preferable that the lithium-containing compound includes at least one member selected from the group consisting of cobalt (Co), nickel (Ni), manganese (Mn), and iron (Fe) as a transition metal element. Examples of such a lithium-containing compound include a lithium composite oxide having a layered rock salt type structure represented by the formula (C), formula (D), or formula (E), and a spinel type compound represented by the formula (F). Examples thereof include a lithium composite oxide having a structure, or a lithium composite phosphate having an olivine structure shown in the formula (G). Specifically, LiNi _0.50 Co _0.20 Mn _0.30 O ₂ , Li _a CoO ₂ (A≈1), Li _b NiO ₂ (b≈1), Li _c1 Ni _c2 Co _1-c2 O ₂ (c1≈1, 0 <c2 <1), Li _d Mn ₂ O ₄ (d≈1) or Li _e FePO ₄ (e≈1).

_{Li p Ni (1-qr)} Mn q M1 r O (2-y) X z ··· (A)
(In the formula (A), M1 represents at least one element selected from Groups 2 to 15 excluding nickel (Ni) and manganese (Mn). X represents Group 16 other than oxygen (O)) It represents at least one of elements and group 17. Elements p, q, y, and z are 0 ≦ p ≦ 1.5, 0 ≦ q ≦ 1.0, 0 ≦ r ≦ 1.0, −0.10. ≦ y ≦ 0.20 and 0 ≦ z ≦ 0.2.

Li _a M2 _b PO ₄ (B)
(In the formula (B), M2 represents at least one element selected from Groups 2 to 15. a and b are 0 ≦ a ≦ 2.0 and 0.5 ≦ b ≦ 2.0. It is a value within the range.)

Li _f Mn _(1-gh) Ni _g M3 _h O _(2-j) F _k (C)
(However, in formula (C), M3 is cobalt (Co), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr), iron (Fe ), Copper (Cu), zinc (Zn), zirconium (Zr), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr) and tungsten (W) F, g, h, j and k are 0.8 ≦ f ≦ 1.2, 0 <g <0.5, 0 ≦ h ≦ 0.5, g + h <1, −0.1 ≦ j. ≦ 0.2, 0 ≦ k ≦ 0.1 (The composition of lithium varies depending on the state of charge and discharge, and the value of f represents the value in the complete discharge state.)

Li _m Ni _(1-n) M4 _n O _(2-p) F _q (D)
(However, in formula (D), M4 is cobalt (Co), manganese (Mn), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr ), Iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr), and tungsten (W). M, n, p and q are 0.8 ≦ m ≦ 1.2, 0.005 ≦ n ≦ 0.5, −0.1 ≦ p ≦ 0.2, 0 ≦ q ≦ 0.1. (Note that the composition of lithium varies depending on the state of charge and discharge, and the value of m represents a value in a fully discharged state.)

Li _r Co _(1-s) M5 _s O _{(2-t) Fu} (E)
(However, in formula (E), M5 is nickel (Ni), manganese (Mn), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr ), Iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr), and tungsten (W). R, s, t, and u are ranges of 0.8 ≦ r ≦ 1.2, 0 ≦ s <0.5, −0.1 ≦ t ≦ 0.2, and 0 ≦ u ≦ 0.1. (Note that the composition of lithium varies depending on the state of charge and discharge, and the value of r represents a value in a fully discharged state.)

Li _v Mn _2-w M6 _w O _x F _y (F)
(However, in formula (F), M6 is cobalt (Co), nickel (Ni), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr ), Iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr), and tungsten (W). V, w, x, and y are in the range of 0.9 ≦ v ≦ 1.1, 0 ≦ w ≦ 0.6, 3.7 ≦ x ≦ 4.1, and 0 ≦ y ≦ 0.1. (Note that the composition of lithium varies depending on the state of charge and discharge, and the value of v represents the value in a fully discharged state.)

Li _z M7PO ₄ (G)
(However, in formula (G), M7 is cobalt (Co), manganese (Mn), iron (Fe), nickel (Ni), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti ), Vanadium (V), niobium (Nb), copper (Cu), zinc (Zn), molybdenum (Mo), calcium (Ca), strontium (Sr), tungsten (W) and zirconium (Zr) Z represents a value in a range of 0.9 ≦ z ≦ 1.1, wherein the composition of lithium varies depending on the state of charge and discharge, and the value of z is a value in a fully discharged state. Represents.)

  As the lithium-containing compound containing nickel (Ni), those having a Ni content of 80% or more are preferable. When the Ni content is 80% or more, the battery capacity is increased, but the oxygen release amount of the positive electrode 21 at a high temperature is remarkably increased, and the gas generation amount is rapidly increased at the time of abnormality. In the battery according to the first embodiment, gas can be efficiently discharged when gas is generated at the time of abnormality. Therefore, even when a lithium-containing compound as described above is used, compared to a general battery. In this way, battery rupture during gas generation can be suppressed.

The lithium-containing compound having a Ni content of 80% or more is preferably a positive electrode material represented by the formula (H).
Li _v Ni _w M ′ _x M ″ _y O _z (H)
(Where 0 <v <2, w + x + y ≦ 1, 0.8 ≦ w ≦ 1, 0 ≦ x ≦ 0.2, 0 ≦ y ≦ 0.2, 0 <z <3, and M, M ′ And M ″ are Ni (nickel), Co (cobalt), Fe (iron), Mn (manganese), Cu (copper), Zn (zinc), Al (aluminum), Cr (chromium), V (vanadium), (At least one selected from Ti (titanium), Mg (magnesium), and Zr (zirconium)).

In addition to these, positive electrode materials capable of inserting and extracting lithium include inorganic compounds not containing lithium, such as MnO ₂ , V ₂ O ₅ , V ₆ O ₁₃ , NiS, and MoS.

  The positive electrode material capable of inserting and extracting lithium may be other than the above. Moreover, the positive electrode material illustrated above may be mixed 2 or more types by arbitrary combinations.

(Negative electrode)
The negative electrode 22 has, for example, a structure in which a negative electrode active material layer 22B is provided on both surfaces of a negative electrode current collector 22A. Although not shown, the negative electrode active material layer 22B may be provided only on one surface of the negative electrode current collector 22A. The anode current collector 22A is made of, for example, a metal foil such as a copper foil.

  The negative electrode active material layer 22B includes one or more negative electrode materials capable of inserting and extracting lithium as the negative electrode active material, and the positive electrode active material layer 21B as necessary. It is comprised including the binder similar to.

  In this secondary battery, the electrochemical equivalent of the negative electrode material capable of inserting and extracting lithium is larger than the electrochemical equivalent of the positive electrode 21, and lithium metal is deposited on the negative electrode 22 during charging. It is supposed not to.

  Examples of the negative electrode material capable of inserting and extracting lithium include non-graphitizable carbon, graphitizable carbon, graphite, pyrolytic carbons, cokes, glassy carbons, and fired organic polymer compounds And carbon materials such as carbon fiber and activated carbon. Among these, examples of coke include pitch coke, needle coke, and petroleum coke. An organic polymer compound fired body refers to a carbonized material obtained by firing a polymer material such as phenol resin or furan resin at an appropriate temperature, and part of it is non-graphitizable carbon or graphitizable carbon. Some are classified as: Examples of the polymer material include polyacetylene and polypyrrole. These carbon materials are preferable because the change in crystal structure that occurs during charge and discharge is very small, a high charge and discharge capacity can be obtained, and good cycle characteristics can be obtained. In particular, graphite is preferable because it has a high electrochemical equivalent and can provide a high energy density. Further, non-graphitizable carbon is preferable because excellent characteristics can be obtained. Furthermore, those having a low charge / discharge potential, specifically, those having a charge / discharge potential close to that of lithium metal are preferable because a high energy density of the battery can be easily realized.

  Examples of the negative electrode material capable of inserting and extracting lithium include materials capable of inserting and extracting lithium and containing at least one of a metal element and a metalloid element as a constituent element. Here, the negative electrode 22 containing such a negative electrode material is referred to as an alloy-based negative electrode. This is because a high energy density can be obtained by using such a material. In particular, the use with a carbon material is more preferable because a high energy density can be obtained and excellent cycle characteristics can be obtained. The negative electrode material may be a single element, alloy or compound of a metal element or metalloid element, or may have at least a part of one or more of these phases. In the present technology, the alloy includes an alloy including one or more metal elements and one or more metalloid elements in addition to an alloy composed of two or more metal elements. Moreover, the nonmetallic element may be included. Some of the structures include a solid solution, a eutectic (eutectic mixture), an intermetallic compound, or two or more of them.

  Examples of metal elements or metalloid elements constituting the negative electrode material include magnesium (Mg), boron (B), aluminum (Al), gallium (Ga), indium (In), silicon (Si), and germanium (Ge). ), Tin (Sn), lead (Pb), bismuth (Bi), cadmium (Cd), silver (Ag), zinc (Zn), hafnium (Hf), zirconium (Zr), yttrium (Y), palladium (Pd) ) Or platinum (Pt). These may be crystalline or amorphous.

  Among these, as the negative electrode material, a material containing a 4B group metal element or a semimetal element in the short-period type periodic table as a constituent element is preferable, and at least one of silicon (Si) and tin (Sn) is particularly preferable. It is included as an element. This is because silicon (Si) and tin (Sn) have a large ability to occlude and release lithium (Li), and a high energy density can be obtained.

  As an alloy of tin (Sn), for example, as a second constituent element other than tin (Sn), silicon (Si), nickel (Ni), copper (Cu), iron (Fe), cobalt (Co), manganese (Mn), zinc (Zn), indium (In), silver (Ag), titanium (Ti), germanium (Ge), bismuth (Bi), antimony (Sb), and chromium (Cr) The thing containing at least 1 sort is mentioned. As an alloy of silicon (Si), for example, as a second constituent element other than silicon (Si), tin (Sn), nickel (Ni), copper (Cu), iron (Fe), cobalt (Co), manganese (Mn), zinc (Zn), indium (In), silver (Ag), titanium (Ti), germanium (Ge), bismuth (Bi), antimony (Sb), and chromium (Cr). The thing containing 1 type is mentioned.

  Examples of the tin (Sn) compound or silicon (Si) compound include those containing oxygen (O) or carbon (C). In addition to tin (Sn) or silicon (Si), the above-described compounds are used. Two constituent elements may be included.

Examples of the negative electrode material capable of inserting and extracting lithium further include other metal compounds or polymer materials. Examples of other metal compounds include oxides such as MnO ₂ , V ₂ O ₅ , and V ₆ O ₁₃ , sulfides such as NiS and MoS, and lithium nitrides such as LiN ₃ , and polymer materials include polyacetylene. , Polyaniline or polypyrrole.

(Separator)
The separator 23 separates the positive electrode 21 and the negative electrode 22 and allows lithium ions to pass through while preventing a short circuit of current due to contact between the two electrodes. The separator 23 is made of, for example, a porous film made of synthetic resin made of polytetrafluoroethylene, polypropylene, polyethylene, or the like, or a porous film made of ceramic, and these two or more kinds of porous films are laminated. It may be a structure. Among these, a porous film made of polyolefin is preferable because it is excellent in the effect of preventing short circuit and can improve the safety of the battery due to the shutdown effect. In particular, polyethylene is preferable as a material constituting the separator 23 because a shutdown effect can be obtained in a range of 100 ° C. or higher and 160 ° C. or lower and the electrochemical stability is excellent. Polypropylene is also preferable. In addition, any resin having chemical stability can be used by copolymerizing or blending with polyethylene or polypropylene.

(Electrolyte)
The separator 23 is impregnated with an electrolytic solution that is a liquid electrolyte. This electrolytic solution contains a solvent and an electrolyte salt dissolved in the solvent.

  As the solvent, cyclic carbonates such as ethylene carbonate or propylene carbonate can be used, and it is preferable to use one of ethylene carbonate and propylene carbonate, particularly a mixture of both. This is because the cycle characteristics can be improved.

  As the solvent, in addition to these cyclic carbonates, a chain carbonate such as diethyl carbonate, dimethyl carbonate, ethylmethyl carbonate or methylpropyl carbonate is preferably mixed and used. This is because high ionic conductivity can be obtained.

  It is preferable that the solvent further contains 2,4-difluoroanisole or vinylene carbonate. This is because 2,4-difluoroanisole can improve discharge capacity, and vinylene carbonate can improve cycle characteristics. Therefore, it is preferable to use a mixture of these because the discharge capacity and cycle characteristics can be improved.

  In addition to these, examples of the solvent include butylene carbonate, γ-butyrolactone, γ-valerolactone, 1,2-dimethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxolane, 4-methyl-1,3- Dioxolane, methyl acetate, methyl propionate, acetonitrile, glutaronitrile, adiponitrile, methoxyacetonitrile, 3-methoxypropironitrile, N, N-dimethylformamide, N-methylpyrrolidinone, N-methyloxazolidinone, N, N-dimethylimidazo Examples include ridinone, nitromethane, nitroethane, sulfolane, dimethyl sulfoxide, and trimethyl phosphate.

  A compound obtained by substituting at least a part of hydrogen in these non-aqueous solvents with fluorine may be preferable because the reversibility of the electrode reaction may be improved depending on the type of electrode to be combined.

As electrolyte salt, lithium salt is mentioned, for example, 1 type may be used independently, and 2 or more types may be mixed and used for it. Lithium salts include LiPF ₆ , LiBF ₄ , LiAsF ₆ , LiClO ₄ , LiB (C ₆ H ₅ ) ₄ , LiCH ₃ SO ₃ , LiCF ₃ SO ₃ , LiN (SO ₂ CF ₃ ) ₂ , LiC (SO ₂ CF ₃ ) ₃ , LiAlCl ₄ , LiSiF ₆ , LiCl, difluoro [oxolato-O, O ′] lithium borate, lithium bisoxalate borate, or LiBr. Among them, LiPF ₆ is preferable because it can obtain high ion conductivity and can improve cycle characteristics.

(Upper insulating plate, lower insulating plate)
Here, the configuration of the upper insulating plate 12 and the lower insulating plate 13 will be described with reference to FIG. FIG. 3A is a plan view showing the configuration of the first example of the shape of the upper insulating plate 12, and FIG. 3B is a plan view showing the configuration of the first example of the shape of the lower insulating plate 13.

  The upper insulating plate 12 is configured in a substantially circular flat plate shape, and a circular hole 61 through which the center pin 24 is inserted is formed in a substantially central portion.

  A cutout space 62 is formed in the upper insulating plate 12 from the outer periphery to the hole 61 so that the outer periphery communicates with the hole 61. In the first example, the space 62 is configured to expand in a fan shape from the hole 61 toward the outer periphery.

  Similarly, the lower insulating plate 13 is also formed with a hole 71 substantially in the center, and a fan-shaped space 72 is formed from the outer periphery to the hole 71 so that the outer periphery communicates with the hole 71.

  FIG. 3C is a plan view showing the configuration of the second example of the shape of the upper insulating plate 12, and FIG. 3D is a plan view showing the configuration of the second example of the shape of the lower insulating plate 13.

  The upper insulating plate 12 is formed in a substantially circular flat plate shape, and a circular hole 61 through which a center pin is inserted is formed at a substantially center.

  The upper insulating plate 12 is formed with a notch-shaped space 62 from the outer periphery to the hole 61 so that the outer periphery communicates with the hole 61. In the second example, the space 62 is formed in a rectangular shape having a constant width from the hole 61 toward the outer periphery.

  Similarly, the lower insulating plate 13 is also formed with a hole 71 at substantially the center, and a rectangular space 72 is formed from the outer periphery to the hole 71 so that the outer periphery communicates with the hole 71.

  When the upper insulating plate 12 is provided in the battery can 11, the space portion 62 of the upper insulating plate 12 communicates with the outer peripheral gap 32 that is a gap between the inner wall of the battery can 11 and the wound electrode body 20. Since the space portion 62 communicates with the hole portion 61, the outer peripheral gap 32, the space portion 62, and the hole portion 61 communicate with each other.

  Further, when the lower insulating plate 13 is provided in the battery can 11, the space 72 of the lower insulating plate 13 communicates with the outer peripheral gap 32 that is a gap between the inner wall of the battery can 11 and the wound electrode body 20. Become. Since the space portion 72 communicates with the hole portion 71, the outer peripheral gap 32, the space portion 72, and the hole portion 71 communicate with each other.

  The outer peripheral gap 32, the space 62, and the hole 61 function as a gas flow path by communicating with each other. Similarly, the outer peripheral gap 32, the space 72, and the hole 71 also function as a gas flow path.

  Furthermore, since the hole 61 of the upper insulating plate 12 and the hole 71 of the lower insulating plate 13 are both in communication with the central space 31, the central space 31 also functions as a gas flow path.

  When gas is generated in the battery can 11 during an abnormality such as when dropped in the fire, the gas flows through the outer circumferential gap 32 and the space 62 and the hole 61 of the upper insulating plate 12, and the outer circumferential gap 32 and the lower part. The upper end of the battery can 11 is opened up through the flow path formed by the space 72 and the hole 71 of the insulating plate 13, and further through the flow path formed by the central space 31, the hole 61 and the hole 71. It will be discharged to the outside from the part.

  Thereby, the gas generated in the battery can 11 can be efficiently released to the outside, and the battery can 11 can be prevented from being damaged.

  The opening angle θ of the space 62 of the upper insulating plate 12 is preferably 1 degree or more and 100 degrees or less. When the opening angle θ exceeds 100 degrees, when the battery is ejected by dropping in the fire or the like, and the wound electrode body 20 moves to the upper part of the battery, the force for holding the movement by the upper insulating plate 12 is insufficient, There is a possibility that the wound electrode body 20 may jump out of the upper portion of the battery can 11. In addition, since the contact area between the upper insulating plate 12 and the upper part of the wound electrode body 20 is reduced, there is a risk that durability due to vibration or the like may be reduced. On the other hand, when the opening angle θ is less than 1 degree, the function of the space portion 62 as a gas discharge channel is lowered, and the wound electrode body 20 may jump out of the upper portion of the battery can 11. Here, the opening angle θ of the space portion 62 of the upper insulating plate 12 is an opening angle on the inner peripheral side of the space portion 62.

It is preferred minimum ratio of the width D _B of the space 62 to the width D _A of the upper insulating plate 12 is 0.47 or less. When the ratio exceeds 0.47, when the battery is blown out by dropping in the fire or the like and the wound electrode body 20 moves to the upper part of the battery, the force for suppressing the movement by the upper insulating plate 12 is insufficient and the winding is performed. There is a possibility that the rotating electrode body 20 may jump out of the upper portion of the battery can 11. In addition, since the contact area between the upper insulating plate 12 and the upper part of the wound electrode body 20 is reduced, there is a risk that durability due to vibration or the like may be reduced.

  The opening angle θ of the space 62 of the lower insulating plate 13 is preferably 1 degree or more and 100 degrees or less. When the opening angle θ exceeds 100 degrees, the amount of gas flowing into the spirally wound electrode body 20 increases too much, thereby pushing up the upper insulating plate 12, and thereby the resistance when the battery is dropped into fire. May get worse. Further, since the contact area between the lower insulating plate 13 and the lower part of the wound electrode body 20 is reduced, there is a possibility that durability due to vibration or the like may be reduced. On the other hand, when the opening angle θ is less than 1 degree, the function of the space portion 72 as a gas discharge channel is lowered, and the wound electrode body 20 may jump out from the upper portion of the battery can 11. Here, the opening angle θ of the space portion 72 of the lower insulating plate 13 is an opening angle on the inner peripheral side of the space portion 72.

It is preferred minimum ratio of the width D _B of the space 72 to the width D _A of the lower insulating plate 13 is 0.47 or less. When the ratio exceeds 0.47, the amount of gas flowing into the spirally wound electrode body 20 increases too much, thereby pushing up the upper insulating plate 12, and thereby the resistance when the battery is dropped into fire. There is a risk of getting worse. In addition, since the contact area between the lower insulating plate 13 and the lower part of the wound electrode body 20 is reduced, there is a risk that durability due to vibration or the like may be reduced.

(gasket)
Next, the configuration of the gasket 17 will be described with reference to FIG. 4A is a side view of the gasket 17, and FIG. 4B is a plan view of the gasket 17. 4C is a CC cross-sectional view in FIG. 4B, and FIG. 4D is a DD cross-sectional view in FIG. 4A.

  The gasket 17 is configured in a cylindrical shape having a larger diameter at the upper end than the diameter at the lower end. On the side surface of the gasket 17, a space portion 81 that communicates the inside and outside of the gasket 17 is provided.

  Since the space portion 81 corresponds to the position of the space portion 62 of the upper insulating plate 12, the gas generated in the battery can 11 is guided to the upper side of the battery can 11 by the space portion 81 and the space portion 62 and discharged to the outside. A flow path is configured. The space part 81 is configured in a notch shape, for example. However, the space part 81 is not limited to a notch shape, and may be configured in a hole shape. In the example of FIG. 4, the four space portions 81 are provided in four directions in plan view, but the number and positions of the space portions 81 are not limited thereto.

[1.2 Battery Manufacturing Method]
Next, an example of a method for manufacturing a battery according to the first embodiment of the present technology will be described. First, for example, a positive electrode active material, a conductive agent, and a binder are mixed to prepare a positive electrode mixture, and the positive electrode mixture is dispersed in a solvent such as N-methyl-2-pyrrolidone to obtain a paste-like material. A positive electrode mixture slurry is prepared. Next, this positive electrode mixture slurry is applied to the positive electrode current collector 21 </ b> A, the solvent is dried, and the positive electrode active material layer 21 </ b> B is formed by compression molding with a roll press or the like, thereby forming the positive electrode 21.

  Further, for example, a negative electrode active material and a binder are mixed to prepare a negative electrode mixture, and this negative electrode mixture is dispersed in a solvent such as N-methyl-2-pyrrolidone to obtain a paste-like negative electrode mixture slurry Is made. Next, the negative electrode mixture slurry is applied to the negative electrode current collector 22A, the solvent is dried, and the negative electrode active material layer 22B is formed by compression molding using a roll press or the like, and the negative electrode 22 is manufactured.

  Next, the positive electrode lead 25 is attached to the positive electrode current collector 21A by welding or the like, and the negative electrode lead 26 is attached to the negative electrode current collector 22A by welding or the like. Next, the positive electrode 21 and the negative electrode 22 are wound through the separator 23. Next, the front end of the positive electrode lead 25 is welded to the safety valve mechanism 15, and the front end of the negative electrode lead 26 is welded to the battery can 11, and the wound positive electrode 21 and negative electrode 22 are connected to the pair of upper insulating plates 12 and the lower part. It is sandwiched between insulating plates 13 and stored inside the battery can 11. Next, after the positive electrode 21 and the negative electrode 22 are accommodated in the battery can 11, an electrolytic solution containing a phosphorus compound is injected into the battery can 11 and impregnated in the separator 23. Next, the battery lid 14, the safety valve mechanism 15, and the heat sensitive resistance element 16 are fixed to the opening end of the battery can 11 by caulking through a sealing gasket 17. Thereby, the battery shown in FIG. 1 is obtained.

  Hereinafter, the present technology will be specifically described by way of examples. However, the present technology is not limited only to these examples. A fire drop test was performed on Examples 1-1 to 1-24 related to the batteries obtained as described above.

The minimum width D ratio of _B of the space 62 to the width D _A of the upper insulating plate 12 shall be determined based on Equation 1 below.

Upper width ratio = minimum width D _B of the space 62 of the upper insulating plate 12 / width D _A of the upper insulating plate 12 (1)

Similarly, the minimum width D ratio of _B of the space 72 to the width D _A of the lower insulating plate 13 shall be determined based on Equation 2 below.

Lower width ratio = minimum width D _B of the space 72 of the lower insulating plate 13 / width D _A of the lower insulating plate 13 (2)
Moreover, the space ratio of the gasket 17 shall be calculated | required based on the following formula 3.
Space ratio of the gasket 17 = (length of the outer periphery of the four sum of the width w of the space 81 L _B / gasket _{17 L A) × 100 [%} ] ··· (3)
Here, the width w of the space portion 81 is the width in the circumferential direction of the gasket 17 as shown in FIGS. 4B and 4D. 4B and 4D, the outer peripheral length L _A of the gasket 17 is the outer peripheral length of the gasket 17 in the portion where the space portion 81 is provided (L _A = 2πR, R: gasket 17). Radius of the outer circumference).

<Comparative Example 1>
A battery was prepared without providing a space in either the upper insulating plate 12 or the lower insulating plate 13.

<Example 1-1>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. The lower insulating plate 13 was configured without providing a space portion. Furthermore, the space ratio of the gasket 17 was set to 0%.

<Example 1-2>
The upper insulating plate 12 was configured without a space. The shape of the space 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was set to 0%.

<Example 1-3>
The upper insulating plate 12 was configured without a space. The lower insulating plate 13 was also configured without providing a space. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-4>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was set to 0%.

<Example 1-5>
The upper insulating plate 12 was configured without a space. The shape of the space portion 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space portion 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-6>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. The lower insulating plate 13 was configured without providing a space portion. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-7>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 60 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0470. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-8>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part was 20 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0160. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-8>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.07. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3A, and the opening angle of the space part was 20 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0160. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-9>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 2 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was 0.0016. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-10>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 0.8 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0007. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-11>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 80 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-12>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 100 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0780. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-13>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 105 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0820. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-14>
The upper insulating plate 12 was configured without a space. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-15>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 60 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0470. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-16>
The shape of the space portion 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space portion 62 was 20 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0160. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-17>
The shape of the space portion 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space portion 62 was 2 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0016. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-18>
The shape of the space portion 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space portion 62 was 0.8 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0007. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-19>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 80 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-20>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 100 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0780. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-21>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space was 105 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0820. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3A, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 10%.

<Example 1-22>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 30%.

<Example 1-23>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 50%.

<Example 1-24>
The shape of the space 62 of the upper insulating plate 12 was a fan shape shown in FIG. 3A, and the opening angle of the space 62 was 90 degrees. The upper width ratio, which is the ratio between the minimum width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, was set to 0.0700. Moreover, the shape of the space part 72 of the lower insulating plate 13 was a fan shape shown in FIG. 3B, and the opening angle of the space part 72 was 90 degrees. The lower width ratio, which is the ratio between the minimum width of the space 72 of the lower insulating plate 13 and the width of the lower insulating plate 13, was set to 0.0700. Furthermore, the space ratio of the gasket 17 was 55%.

(Fire drop test)
By charging the battery configured as described above at 4.2 V, dropping it into the fire 10 times, and checking the number of times the battery can 11 has been damaged, the space 62 provided in the upper insulating plate 12, The effect of the gasket 17 provided with the space part 72 and the space part 81 provided in the lower insulating plate 13 was confirmed.

  The test results are shown in Table 1.

  As shown in Table 1, in Comparative Example 1 in which no space was provided, the battery can 11 was broken 10 times out of 10 times.

  From Example 1-1 to Example 1-24, it can be seen that the number of breaks of the battery can 11 is reduced by providing the space 62 in the upper insulating plate 12 and / or the space 72 in the lower insulating plate 13. It was.

  Further, from the comparison between Example 1-1 and Example 1-2 and the comparison between Example 1-5 and Example 1-6, the lower insulating plate 13 is provided rather than the space 62 provided only in the upper insulating plate 12. It was found that the number of breaks of the battery can 11 was less when the space 72 was provided only in the battery. Therefore, it was found that when the space portion is provided only in one of the upper insulating plate 12 and the lower insulating plate 13, the number of breaks of the battery can 11 can be reduced by providing the space portion 72 in the lower insulating plate 13. .

  In addition, from Example 1-7, Example 1-8, and Example 1-9 in which the upper insulating plate 12 is provided with the space portion 62 and the lower insulating plate 13 is provided with the space portion 72, the upper insulating plate 12 is provided. It was found that the breakage of the battery can 11 is remarkably reduced by providing a space in both the lower insulating plate 13 and the lower insulating plate 13. Therefore, it was found that the space is preferably provided in both the upper insulating plate 12 and the lower insulating plate 13.

  Further, the width of the space portion 62 of the upper insulating plate 12 is constant, and the width of the space portion is reduced from Examples 1-7 to 1-13 in which the width of the space portion 72 of the lower insulating plate 13 is changed. It has been found that the effect of reducing the number of breaks of the battery can 11 is not sufficiently exhibited when the time is too long.

  Similarly, the width of the space portion 72 of the lower insulating plate 13 is made constant, and the width of the space portion is also made smaller from those in Examples 1-15 to 1-21 where the width of the space portion 62 of the upper insulating plate 12 is changed. It has been found that the effect of reducing the number of breakage of the battery can 11 is not sufficiently exhibited if it is too much.

  From the above results, it was found that it is preferable to provide a space in both the upper insulating plate 12 and the lower insulating plate 13. Further, it was found that when the space portion is provided in either the upper insulating plate 12 or the lower insulating plate 13, it is preferable to provide the lower insulating plate 13.

  Further, when the shape of the space portion 62 of the upper insulating plate 12 and the space portion 72 of the lower insulating plate 13 is a fan shape shown in FIGS. 3A and 3B, the opening angle of the space portion 62 and the space portion 72 is too small or It has been found that the battery can 11 may be damaged at the time of abnormality even if it is too large. It was found that the opening angle of the space 62 in the upper insulating plate 12 is preferably about 1 degree or more and about 100 degrees or less. It has been found that the opening angle of the space in the lower insulating plate 13 is preferably about 1 degree or more and about 100 degrees or less.

  Further, when the shape of the space portion 62 of the upper insulating plate 12 and the space portion 72 of the lower insulating plate 13 is the rectangular shape shown in FIGS. 3C and 3D, the battery in an abnormal state is formed even if the width of the space portion is too large. It has been found that the can 11 may be damaged. It was found that the upper width ratio, which is the ratio between the width of the space 62 of the upper insulating plate 12 and the width of the upper insulating plate 12, is preferably about 0.47 or less. It was also found that the lower width ratio, which is the ratio of the width of the space 72 of the lower insulating plate 13 to the width of the lower insulating plate 13, is preferably about 0.47 or less.

  Furthermore, it was found that the space ratio of the gasket 17 is preferably 1% or more and about 50% or less.

It is desirable that at least a part of the position of the space 62 of the upper insulating plate 12 and the space 72 of the lower insulating plate 13 overlap in the height direction of the wound electrode body 20. This is because the space portion 62 of the upper insulating plate 12 and the space portion 72 of the lower insulating plate 13 are overlapped with each other, whereby the gas flow path is connected and the gas discharge efficiency is considered to be increased.
Here, the height direction of the wound electrode body 20 is substantially the same as the direction in which the upper insulating plate 12 and the lower insulating plate 13 provided at both ends of the wound electrode body 20 face each other, as shown in FIG. The direction of

  In addition, the position of the space 62 of the upper insulating plate 12 or the space 72 of the lower insulating plate 13 and at least a part of the space 81 of the gasket 17 overlap in the height direction of the wound electrode body 20. It is desirable that The space portion 62 of the upper insulating plate 12 or the space portion 72 of the lower insulating plate 13 and the space portion 81 of the gasket 17 are overlapped with each other, whereby the gas flow path is connected and the gas discharge efficiency is increased. Because it is.

  Further, the space 62 of the upper insulating plate 12, the position of the space 72 of the lower insulating plate 13, and at least a part of the space 81 of the gasket 17 overlap in the height direction of the wound electrode body 20. It is desirable. The space 62 of the upper insulating plate 12, the space 72 of the lower insulating plate 13, and the space 81 of the gasket 17 are overlapped, so that the gas flow path is connected, and the gas discharge efficiency is considered to be increased. Because.

  In this way, the battery according to the present technology is configured. In addition, this technique is not limited to the above-mentioned embodiment, Various deformation | transformation based on the technical idea of this technique is possible.

  For example, the configurations, methods, processes, shapes, materials, numerical values, and the like given in the above-described embodiments are merely examples, and different configurations, methods, processes, shapes, materials, numerical values, and the like are used as necessary. Also good. In addition, each configuration, method, process, shape, material, and numerical value of the above-described embodiment can be combined with each other without departing from the gist of the present technology.

  In the above-described embodiment, an example in which the present technology is applied to a lithium ion secondary battery has been described. However, the present technology is not limited to this example, and a structure in which a battery element is sealed with an exterior material. It is applicable to various secondary batteries and primary batteries having

<2. Second Embodiment>
In the second embodiment, a battery pack provided with the battery according to the first embodiment will be described.

  FIG. 5 is a block diagram illustrating a circuit configuration example when the battery of the present technology (battery 1, prismatic battery 30 or cylindrical battery 50) is applied to a battery pack. The battery pack includes a switch unit 304 including an assembled battery 301, an exterior, a charge control switch 302a, and a discharge control switch 303a, a current detection resistor 307, a temperature detection element 308, and a control unit 310.

  In addition, the battery pack includes a positive electrode terminal 321 and a negative electrode terminal 322. During charging, the positive electrode terminal 321 and the negative electrode terminal 322 are connected to the positive electrode terminal and the negative electrode terminal of the charger, respectively, and charging is performed. Further, when the electronic device is used, the positive electrode terminal 321 and the negative electrode terminal 322 are connected to the positive electrode terminal and the negative electrode terminal of the electronic device, respectively, and discharge is performed.

  The assembled battery 301 is formed by connecting a plurality of batteries 301a in series and / or in parallel. This battery 301a is a battery of the present technology. In addition, in FIG. 5, although the case where the six batteries 301a are connected to 2 parallel 3 series (2P3S) is shown as an example, other than n parallel m series (n and m are integers), Any connection method may be used.

  The switch unit 304 includes a charge control switch 302a and a diode 302b, and a discharge control switch 303a and a diode 303b, and is controlled by the control unit 310. The diode 302b has a reverse polarity with respect to the charging current flowing from the positive terminal 321 in the direction of the assembled battery 301 and the forward polarity with respect to the discharging current flowing from the negative terminal 322 in the direction of the assembled battery 301. The diode 303b has a forward polarity with respect to the charging current and a reverse polarity with respect to the discharging current. In the example, the switch portion is provided on the + side, but may be provided on the − side.

  The charging control switch 302a is turned off when the battery voltage becomes the overcharge detection voltage, and is controlled by the control unit 310 so that the charging current does not flow through the current path of the assembled battery 301. After the charge control switch is turned off, only discharging is possible through the diode 302b. Further, it is turned off when a large current flows during charging, and is controlled by the control unit 310 so that the charging current flowing in the current path of the assembled battery 301 is cut off.

  The discharge control switch 303a is turned off when the battery voltage becomes the overdischarge detection voltage, and is controlled by the control unit 310 so that the discharge current does not flow through the current path of the assembled battery 301. After the discharge control switch 303a is turned off, only charging is possible via the diode 303b. Further, it is turned off when a large current flows during discharging, and is controlled by the control unit 310 so as to cut off the discharging current flowing in the current path of the assembled battery 301.

  The temperature detection element 308 is, for example, a thermistor, is provided in the vicinity of the assembled battery 301, measures the temperature of the assembled battery 301, and supplies the measured temperature to the control unit 310. The voltage detection unit 311 measures the voltage of the assembled battery 301 and each of the batteries 301a constituting the assembled battery 301, A / D converts this measurement voltage, and supplies the voltage to the control unit 310. The current measurement unit 313 measures the current using the current detection resistor 307 and supplies this measurement current to the control unit 310.

  The switch control unit 314 controls the charge control switch 302a and the discharge control switch 303a of the switch unit 304 based on the voltage and current input from the voltage detection unit 311 and the current measurement unit 313. The switch control unit 314 sends a control signal to the switch unit 304 when any voltage of the battery 301a falls below the overcharge detection voltage or the overdischarge detection voltage, or when a large current flows rapidly. Prevents overcharge, overdischarge, and overcurrent charge / discharge.

Here, for example, when the battery is a lithium ion secondary battery and a material that becomes a lithium alloy near 0 V with respect to Li / Li ⁺ is used as the negative electrode active material, the overcharge detection voltage is, for example, 4.20 V. The overdischarge detection voltage is determined to be, for example, 2.4 V ± 0.1 V.

  As the charge / discharge switch, for example, a semiconductor switch such as a MOSFET can be used. In this case, the parasitic diode of the MOSFET functions as the diodes 302b and 303b. When a P-channel FET is used as the charge / discharge switch, the switch control unit 314 supplies control signals DO and CO to the gates of the charge control switch 302a and the discharge control switch 303a, respectively. When the charge control switch 302a and the discharge control switch 303a are P-channel type, they are turned on by a gate potential that is lower than the source potential by a predetermined value or more. That is, in normal charging and discharging operations, the control signals CO and DO are set to the low level, and the charging control switch 302a and the discharging control switch 303a are turned on.

  For example, during overcharge or overdischarge, the control signals CO and DO are set to a high level, and the charge control switch 302a and the discharge control switch 303a are turned off.

  The memory 317 includes a RAM and a ROM, and includes, for example, an EPROM (Erasable Programmable Read Only Memory) that is a nonvolatile memory. In the memory 317, the numerical value calculated by the control unit 310, the internal resistance value of the battery in the initial state of each battery 301a measured in the manufacturing process, and the like are stored in advance, and can be appropriately rewritten. (In addition, by storing the full charge capacity of the battery 301a, for example, the remaining capacity can be calculated together with the control unit 310.

  The temperature detection unit 318 measures the temperature using the temperature detection element 308, performs charge / discharge control during abnormal heat generation, and performs correction in the calculation of the remaining capacity.

<3. Third Embodiment>
In the third embodiment, devices such as an electronic device and a power storage device on which the battery according to the first embodiment or the battery pack according to the second embodiment is mounted will be described. The battery described in the first embodiment and the battery pack described in the second embodiment can be used to supply power to devices such as electronic devices and power storage devices.

  Examples of electronic devices include notebook computers, PDAs (personal digital assistants), mobile phones, cordless phones, video movies, digital still cameras, electronic books, electronic dictionaries, music players, radios, headphones, game consoles, navigation systems, Memory cards, pacemakers, hearing aids, power tools, electric shavers, refrigerators, air conditioners, TVs, stereos, water heaters, microwave ovens, dishwashers, washing machines, dryers, lighting equipment, toys, medical equipment, robots, road conditioners, traffic lights Etc.

  Examples of the power storage device include a power storage power source for buildings such as houses or power generation facilities.

  Below, the specific example of the electrical storage system using the electrical storage apparatus to which the battery of this technique is applied among the application examples mentioned above is demonstrated.

  This power storage system has the following configuration, for example. The first power storage system is a power storage system in which a power storage device is charged by a power generation device that generates power from renewable energy. The second power storage system is a power storage system that includes a power storage device and supplies power to an electronic device connected to the power storage device. The third power storage system is an electronic device that receives power supply from the power storage device. These power storage systems are implemented as a system for efficiently supplying power in cooperation with an external power supply network.

  Furthermore, the fourth power storage system includes an electric vehicle having a conversion device that receives power supplied from the power storage device and converts the power into a driving force of the vehicle, and a control device that performs information processing related to vehicle control based on information related to the power storage device. It is. The fifth power storage system is a power system that includes a power information transmission / reception unit that transmits / receives signals to / from other devices via a network, and performs charge / discharge control of the power storage device described above based on information received by the transmission / reception unit. . The sixth power storage system is a power system that receives power from the power storage device described above or supplies power from the power generation device or the power network to the power storage device. Hereinafter, the power storage system will be described.

(3-1) Residential Power Storage System as an Application Example An example in which a power storage device using a battery of the present technology is applied to a residential power storage system will be described with reference to FIG. For example, in the power storage system 100 for the house 101, electric power is stored from the centralized power system 102 such as the thermal power generation 102a, the nuclear power generation 102b, and the hydroelectric power generation 102c through the power network 109, the information network 112, the smart meter 107, the power hub 108, and the like. Supplied to the device 103. At the same time, power is supplied to the power storage device 103 from an independent power source such as the home power generation device 104. The electric power supplied to the power storage device 103 is stored. Electric power used in the house 101 is fed using the power storage device 103. The same power storage system can be used not only for the house 101 but also for buildings.

  The house 101 is provided with a home power generation device 104, a power consuming device 105, a power storage device 103, a control device 110 that controls each device, a smart meter 107, and a sensor 111 that acquires various types of information. Each device is connected by a power network 109 and an information network 112. A solar cell, a fuel cell, or the like is used as the home power generation device 104, and the generated power is supplied to the power consumption device 105 and / or the power storage device 103. The power consuming device 105 is a refrigerator 105a, an air conditioner 105b, a television receiver 105c, a bath 105d, or the like. Furthermore, the electric power consumption device 105 includes an electric vehicle 106. The electric vehicle 106 is an electric vehicle 106a, a hybrid car 106b, and an electric motorcycle 106c.

  The battery of the present technology is applied to the power storage device 103. The battery of the present technology may be configured by, for example, the above-described lithium ion secondary battery. The smart meter 107 has a function of measuring the usage amount of commercial power and transmitting the measured usage amount to an electric power company. The power network 109 may be one or a combination of DC power supply, AC power supply, and non-contact power supply.

  The various sensors 111 are, for example, human sensors, illuminance sensors, object detection sensors, power consumption sensors, vibration sensors, contact sensors, temperature sensors, infrared sensors, and the like. Information acquired by various sensors 111 is transmitted to the control device 110. Based on the information from the sensor 111, the weather state, the state of a person, and the like can be grasped, and the power consumption device 105 can be automatically controlled to minimize the energy consumption. Furthermore, the control device 110 can transmit information regarding the house 101 to an external power company or the like via the Internet.

  The power hub 108 performs processing such as branching of power lines and DC / AC conversion. As a communication method of the information network 112 connected to the control device 110, a method using a communication interface such as UART (Universal Asynchronous Receiver-Transceiver), Bluetooth (registered trademark of Bluetooth SIG), ZigBee, There is a method of using a sensor network based on a wireless communication standard such as Wi-Fi. The Bluetooth method is applied to multimedia communication and can perform one-to-many connection communication. ZigBee uses the physical layer of IEEE (Institute of Electrical and Electronics Engineers) 802.15.4. IEEE 802.15.4 is the name of a short-range wireless network standard called PAN (Personal Area Network) or W (Wireless) PAN.

  The control device 110 is connected to an external server 113. The server 113 may be managed by any one of the house 101, the power company, and the service provider. The information transmitted and received by the server 113 is, for example, information related to power consumption information, life pattern information, power charges, weather information, natural disaster information, and power transactions. These pieces of information may be transmitted / received from a power consuming device in the home (for example, a television receiver) or may be transmitted / received from a device outside the home (for example, a mobile phone). Such information may be displayed on a device having a display function, such as a television receiver, a mobile phone, or a PDA (Personal Digital Assistants).

  A control device 110 that controls each unit includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and is stored in the power storage device 103 in this example. The control device 110 is connected to the power storage device 103, the home power generation device 104, the power consumption device 105, the various sensors 111, the server 113 and the information network 112, and adjusts, for example, the amount of commercial power used and the amount of power generation. It has a function. In addition, you may provide the function etc. which carry out an electric power transaction in an electric power market.

  As described above, the electric power can be stored not only in the centralized power system 102 such as the thermal power 102a, the nuclear power 102b, and the hydropower 102c but also in the power storage device 103 from the home power generation device 104 (solar power generation, wind power generation). it can. Therefore, even if the generated power of the home power generation device 104 fluctuates, it is possible to perform control such that the amount of power to be sent to the outside is constant or discharge is performed as necessary. For example, the electric power obtained by solar power generation is stored in the power storage device 103, and midnight power with a low charge is stored in the power storage device 103 at night, and the power stored by the power storage device 103 is discharged during a high daytime charge. You can also use it.

  In this example, the example in which the control device 110 is stored in the power storage device 103 has been described. However, the control device 110 may be stored in the smart meter 107 or may be configured independently. Furthermore, the power storage system 100 may be used for a plurality of homes in an apartment house, or may be used for a plurality of detached houses.

<4. Fourth Embodiment>
In the fourth embodiment, an electric vehicle equipped with the battery according to the first embodiment or the battery pack according to the second embodiment will be described. FIG. 7 schematically shows an example of the configuration of a hybrid vehicle that employs a series hybrid system to which the present technology is applied. A series hybrid system is a car that runs on an electric power driving force conversion device using electric power generated by a generator driven by an engine or electric power once stored in a battery.

  The hybrid vehicle 200 includes an engine 201, a generator 202, a power driving force conversion device 203, driving wheels 204a, driving wheels 204b, wheels 205a, wheels 205b, a battery 208, a vehicle control device 209, various sensors 210, and a charging port 211. Is installed. The battery of the present technology described above is applied to the battery 208.

  The hybrid vehicle 200 runs using the power driving force conversion device 203 as a power source. An example of the power driving force conversion device 203 is a motor. The electric power / driving force converter 203 is operated by the electric power of the battery 208, and the rotational force of the electric power / driving force converter 203 is transmitted to the driving wheels 204a and 204b. In addition, by using a direct current-alternating current (DC-AC) or reverse conversion (AC-DC conversion) where necessary, the power driving force conversion device 203 can be applied to either an alternating current motor or a direct current motor. The various sensors 210 control the engine speed via the vehicle control device 209 and control the opening (throttle opening) of a throttle valve (not shown). The various sensors 210 include a speed sensor, an acceleration sensor, an engine speed sensor, and the like.

  The rotational force of the engine 201 is transmitted to the generator 202, and the electric power generated by the generator 202 by the rotational force can be stored in the battery 208.

  When the hybrid vehicle 200 decelerates by a braking mechanism (not shown), the resistance force at the time of deceleration is applied as a rotational force to the power driving force conversion device 203, and the regenerative electric power generated by the power driving force conversion device 203 by this rotational force is used as the battery 208. Accumulated in.

  The battery 208 can be connected to a power source external to the hybrid vehicle 200 to receive power supply from the external power source using the charging port 211 as an input port and store the received power.

  Although not shown, an information processing apparatus that performs information processing related to vehicle control based on information related to the battery may be provided. As such an information processing apparatus, for example, there is an information processing apparatus that displays a remaining battery level based on information on the remaining battery level.

  In addition, the above demonstrated as an example the series hybrid vehicle which drive | works with a motor using the electric power generated with the generator driven by an engine, or the electric power once stored in the battery. However, the present technology is also effective for a parallel hybrid vehicle in which the engine and motor outputs are both driving sources, and the system is switched between the three modes of driving with only the engine, driving with the motor, and engine and motor. Applicable. Furthermore, the present technology can be effectively applied to a so-called electric vehicle that travels only by a drive motor without using an engine.

<5. Modification>

  While the embodiments of the present technology have been specifically described above, the present technology is not limited to the above-described embodiments, and various modifications based on the technical idea of the present technology are possible.

  In the above-described embodiment, the shape of the space portion 62 formed in the upper insulating plate 12 and the space portion 72 formed in the lower insulating plate 13 is the fan shape shown in FIGS. 3A and 3B or FIGS. 3C and 3D. The description has been made assuming that the rectangular shape is shown. However, the shape of the space part 62 and the space part 72 is not restricted to them.

  8A to 8E and FIGS. 9A to 9D are plan views of the upper insulating plate 12 showing modifications of the shape of the space 62 formed in the upper insulating plate 12. FIG. The space 62 of the upper insulating plate 12 is not limited to the example of FIGS. 3A and 3C, and may have a shape as shown in FIGS. 8A to 8E and FIGS. 9A to 9D.

  For example, as shown in FIGS. 8C and 9A, a protrusion 63 may be provided on the inner periphery of the upper insulating plate 12, and the upper end of the center pin 24 may be pressed by the protrusion 63.

  Further, as shown in FIGS. 8E and 9A to 9D, one or more space portions 64 extending from the outer periphery of the upper insulating plate 12 to the vicinity of the inner periphery may be further provided. By providing such a space portion 64, the gas discharge efficiency at the time of abnormality can be further increased.

  Further, as shown in FIGS. 9B and 9C, one or more hole portions 65 may be further provided between the inner periphery and the outer periphery of the upper insulating plate 12.

  10A to 10H are plan views of the lower insulating plate 13 showing a modification of the shape of the space portion 72 formed in the lower insulating plate 13. The space part 72 of the lower insulating plate 13 is not limited to the example of FIGS. 3B and 3D, and may have a shape as shown in FIGS. 10A to 10H.

  For example, as shown in FIGS. 10B to 10D, a protrusion 73 may be provided on the inner periphery of the lower insulating plate 13, and the lower end of the center pin 24 may be pressed by the protrusion 73.

  Further, as shown in FIGS. 10E and 10F, a space 74 that extends from the outer periphery of the lower insulating plate 13 to the vicinity of the inner periphery may be further provided.

  8, 9, and 10, a plurality of modifications of the shapes of the upper insulating plate 12 and the lower insulating plate 13 are shown, but the upper insulating plate 12 and the lower insulating plate 13 may be used in any combination. Good.

  Moreover, this technique is applicable also to the battery in which the center pin is not provided in the battery can 11 as shown in FIG. When the center pin is not provided in the battery can 11, the vertical hole at the center of the wound electrode body 20 functions as a gas flow path.

  As shown in FIG. 12, the battery may be provided with two lower insulating plates 13 and 18 stacked on the lower end of the wound electrode body 20. As the lower insulating plate 18, one that does not have a space portion from the outer periphery to the center may be used. The battery includes two negative electrode leads 26, 27. The negative electrode lead 26 is led out from the inner peripheral part of the wound electrode body 20, and the negative electrode lead 27 is led out from the outer peripheral part or the middle peripheral part of the wound electrode body 20. When it exists, the structure provided with the two lower insulating plates 13 and 18 as mentioned above is especially preferable. In the configuration in which only one lower insulating plate 13 is provided at the lower end of the wound electrode body 20 as in the battery according to the first embodiment described above, if the space 72 of the lower insulating plate 13 is wide, the negative electrode lead 27 and the lower part of the wound electrode body 20 may come into contact with each other to cause a short circuit. In contrast, in the configuration in which the two lower insulating plates 13 and 18 are provided as described above, even when the space 72 of the lower insulating plate 13 is wide, the negative electrode lead 27 and the winding electrode It can prevent that the lower part of the body 20 contacts and short-circuits. In place of the lower insulating plate 18, a non-woven fabric as a filter member may be used. Moreover, you may make it a battery be provided with the upper insulating board on which 2 sheets were piled up. Further, three or more lower insulating plates and / or upper insulating plates may be stacked.

  As described above, even when the plurality of lower insulating plates 13 and 18 are stacked in the battery can 11, the outer peripheral gap 32, the space 62, and the space 81 are communicated. Therefore, the gas can be released out of the battery can 11. The same applies to a configuration in which a plurality of upper insulating plates are stacked.

  Moreover, although the above-mentioned embodiment demonstrated the example which provided the space part in both the upper insulating board 12 and the lower insulating board 13, the space part was provided only in one of the upper insulating board 12 and the lower insulating board 13. You may do it. In this case, it is preferable to provide a space in the lower insulating plate 13. This is because when the space is provided in the lower insulating plate 13, the gas discharge efficiency at the time of abnormality can be improved as compared with the case where the space is provided in the upper insulating plate 12.

In addition, the present technology can take the following configurations.
(1)
Case and
An electrode body housed in the case;
An insulating plate provided at both ends of the electrode body,
A battery in which at least one of the insulating plates provided at both ends has a space from the outer periphery to the center.
(2)
A safety valve,
The battery according to (1), wherein the insulating plate having the space is provided on a side opposite to the safety valve.
(3)
Cell according to the ratio of the minimum width D _B of the space portion to the width D _A of the insulating plate is 0.47 or less (1) or (2).
(4)
The battery according to (1) or (2), wherein an opening angle of the space portion is not less than 1 degree and not more than 100 degrees.
(5)
Both of the insulating plates provided at both ends have a space portion from the outer periphery to the center,
The battery according to any one of (1) to (4), wherein at least a part of the space portion of the insulating plate provided at both ends has an overlap in the height direction of the electrode body.
(6)
The battery according to any one of (1) to (5), further including an insulating plate or a non-woven fabric provided to overlap the insulating plate having the space portion.
(7)
Further comprising a gasket provided on the insulating plate,
The battery according to any one of (1) to (6), wherein the gasket has at least one space portion that connects the inside and outside of the gasket.
(8)
The battery according to (7), wherein the space portion of the gasket is a notch portion provided at one end on the side facing the insulating plate among both ends of the gasket.
(9)
The battery according to (7) or (8), wherein the gasket has a space ratio of 1% to 50%.
(10)
Any of (7) to (9), wherein the space provided in the insulating plate and at least a part of the space provided in the gasket overlap in the height direction of the electrode body. A battery according to any one of the above.
(11)
The battery according to any one of (1) to (10), wherein the electrode body is a wound electrode body having a space at a substantially center.
(12)
The battery according to (11), further comprising a pin inserted into the space portion of the electrode body.
(13)
A gap is provided between the case and the wound electrode body,
The battery according to any one of (1) to (12), wherein the gap and the space are connected.
(14)
The battery according to any one of (1) to (13), wherein the wound electrode body includes a positive electrode including a positive electrode material having the following composition.
Li _v Ni _w M ′ _x M ″ _y O _z
(Where 0 <v <2, w + x + y ≦ 1, 0.8 ≦ w ≦ 1, 0 ≦ x ≦ 0.2, 0 ≦ y ≦ 0.2, 0 <z <3, and M, M ′ And M ″ are Ni (nickel), Co (cobalt), Fe (iron), Mn (manganese), Cu (copper), Zn (zinc), Al (aluminum), Cr (chromium), V (vanadium), (At least one selected from Ti (titanium), Mg (magnesium), and Zr (zirconium)).
(15)
Case and
An electrode body housed in the case;
An insulating plate provided at one end of the electrode body,
A battery in which the insulating plate has a space from the outer periphery to the center.
(16)
The battery according to any one of (1) to (15);
A control unit for controlling the battery;
A battery pack having an exterior housing the battery.
(17)
(1) to the battery according to any one of (14),
An electronic device that receives power from the battery.
(18)
(1) to the battery according to any one of (14),
A power storage device that supplies electric power to an electronic device connected to the battery.
(19)
An electric power system that receives supply of electric power from the battery according to any one of (1) to (14) or supplies electric power to the battery from a power generation device or an electric power network.
(20)
The battery according to any one of (1) to (14);
A conversion device that receives supply of electric power from the battery and converts it into driving force of a vehicle;
An electric vehicle comprising: a control device that performs information processing related to vehicle control based on information related to the battery.

11 ... Battery can 12 ... Upper insulating plate 13 ... Lower insulating plate 17 ... Gasket 20 ... ··· Wound electrode body 21 ········ Positive electrode plate 22 ······· Negative electrode plate 23 ········· Separator 61, 71 ··· Hole 62, 72... Space portion 81... Space portion 100... Power storage system 103... Power storage device 104. Internal power generation device 105... Electric power consumption device 106... Electric vehicle 106 a. Motorbike 109 ··· Power grid 110 ······ Control device 200 ··· Hybrid vehicle 202 ··· From Machine 203 ....... power driving force converter 209 ....... vehicle controller

Claims (20)

Case and
An electrode body housed in the case;
An insulating plate provided at both ends of the electrode body,
A battery in which at least one of the insulating plates provided at both ends has a space from the outer periphery to the center. A safety valve,
The battery according to claim 1, wherein the insulating plate having the space is provided on a side opposite to the safety valve. Battery of claim 1 ratio is 0.47 or less of the minimum width D _B of the space portion to the width D _A of the insulating plate. The battery according to claim 1, wherein an opening angle of the space portion is not less than 1 degree and not more than 100 degrees. Both of the insulating plates provided at both ends have a space portion from the outer periphery to the center,
The battery according to claim 1, wherein at least a part of the space portion of the insulating plate provided at the both ends overlaps in the height direction of the electrode body. The battery according to claim 1, further comprising an insulating plate or a non-woven fabric provided on the insulating plate having the space. Further comprising a gasket provided on the insulating plate,
The battery according to claim 1, wherein the gasket has at least one space portion that connects the inside and outside of the gasket. The battery according to claim 7, wherein the space portion of the gasket is a notch portion provided at one end on the side facing the insulating plate among both ends of the gasket. The battery according to claim 7, wherein the gasket has a space ratio of 1% to 50%. The battery according to claim 7, wherein the space provided in the insulating plate and at least a part of the space provided in the gasket overlap in a height direction of the electrode body. The battery according to claim 1, wherein the electrode body is a wound electrode body having a space portion at substantially the center. The battery according to claim 11, further comprising a pin inserted into the space of the electrode body. A gap is provided between the case and the wound electrode body,
The battery according to claim 1, wherein the gap and the space are connected. The battery according to claim 1, wherein the wound electrode body includes a positive electrode including a positive electrode material having the following composition.
Li _v Ni _w M ′ _x M ″ _y O _z
(Where 0 <v <2, w + x + y ≦ 1, 0.8 ≦ w ≦ 1, 0 ≦ x ≦ 0.2, 0 ≦ y ≦ 0.2, 0 <z <3, and M, M ′ And M ″ are Ni (nickel), Co (cobalt), Fe (iron), Mn (manganese), Cu (copper), Zn (zinc), Al (aluminum), Cr (chromium), V (vanadium), (At least one selected from Ti (titanium), Mg (magnesium), and Zr (zirconium)). Case and
An electrode body housed in the case;
An insulating plate provided at one end of the electrode body,
A battery in which the insulating plate has a space from the outer periphery to the center. A battery according to claim 1;
A control unit for controlling the battery;
A battery pack having an exterior housing the battery. A battery according to claim 1,
An electronic device that receives power from the battery. A battery according to claim 1,
A power storage device that supplies electric power to an electronic device connected to the battery. The electric power system which receives supply of electric power from the battery of Claim 1, or supplies electric power to the said battery from an electric power generating apparatus or an electric power network. A battery according to claim 1;
A conversion device that receives supply of electric power from the battery and converts it into driving force of a vehicle;
An electric vehicle comprising: a control device that performs information processing related to vehicle control based on information related to the battery.

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