JP2008097991A - Power storage device - Google Patents

Abstract

To improve safety when handling an electricity storage device by freely setting a timing for generating a voltage in the electricity storage device.
An electrode stacking unit in which a positive electrode and a negative electrode are stacked is arranged in an outer container. A lithium ion supply source 16 is disposed above the electrode stack unit 14 so as to face the negative electrode 11. A separator 20 is provided between the negative electrode 11 and the lithium ion supply source 16, and the insulation state between the negative electrode 11 and the lithium ion supply source 16 is maintained. A large number of protrusions 21 are formed on the negative electrode current collector 11 a facing the lithium ion supply source 16. By applying pressure from the outside of the outer container 13, the protrusions 21 can penetrate the separator 20. Thereby, since the negative electrode 11 and the lithium ion supply source 16 can be short-circuited, lithium ion can be carried on the negative electrode 11 at an arbitrary timing.
[Selection] Figure 2

Description

  The present invention relates to an electricity storage device in which ions are supported on at least one of a negative electrode and a positive electrode.

  In recent years, while environmental problems have been highlighted, electric vehicles and hybrid vehicles have been actively developed, and development of power storage devices mounted on these vehicles has been actively pursued. As electric storage devices for electric vehicles and hybrid vehicles, high energy density and high output density are required, so lithium ion secondary batteries, electric double layer capacitors and the like are listed as candidates. However, the lithium ion secondary battery has a problem that the energy density is high but the output density is low, and the electric double layer capacitor has a problem that the output density is high but the energy density is low. Have.

  Therefore, in order to satisfy both the energy density and the output density, an electricity storage device called a hybrid capacitor combining the storage principle of a lithium ion secondary battery and an electric double layer capacitor has been proposed. This hybrid capacitor uses the electric double layer capacitor activated carbon for the positive electrode, and the positive electrode uses the electric double layer to store electric charges, while the negative electrode uses the carbon material of the lithium ion secondary battery, In the negative electrode, charges are accumulated by doping a carbon material with lithium ions. By adopting such a power storage mechanism, it is possible to combine the high output density of the electric double layer capacitor and the high energy density of the lithium ion secondary battery.

In addition, in lithium ion secondary batteries and lithium ion capacitors, an electricity storage device in which lithium ions are supported (doped) in advance on a carbon material of a negative electrode has been proposed. By supporting lithium ions on the negative electrode, the negative electrode potential can be lowered and the output voltage can be increased, so that the energy density of the electricity storage device can be significantly increased (for example, Patent Documents). 1). Furthermore, in order to uniformly support lithium ions on the negative electrode in the electricity storage device and reduce the time required for the support, a method of bringing the opposing negative electrode and metal lithium into electrochemical contact has been proposed. In this method, by forming a through-hole through which lithium ions pass in the positive electrode current collector and the negative electrode current collector, lithium ions are smoothly moved between the stacked electrodes (for example, Patent Documents). 2).
Japanese Patent Laid-Open No. 8-1007048 International Publication No. 98/33227 Pamphlet

  By the way, in the electrical storage device described in Patent Document 2, in order to support lithium ions on the negative electrode, metallic lithium is arranged in contact with the negative electrode. That is, since the negative electrode and the metal lithium are already short-circuited, lithium ions can be moved from the time when the electrolyte solution is injected into the laminate pack, and the loading of lithium ions on the negative electrode is started. In this way, when the loading of lithium ions is started as the electrolyte is injected, electric charges are accumulated in the negative electrode and a voltage is generated in the electricity storage device. Therefore, in various processes for handling the electricity storage device after completion. Has been required to take safety measures against electric shock.

  In other words, in order to ensure safety when handling power storage devices, it is necessary to provide manufacturing equipment to avoid electric shocks, etc., and to provide safety education to workers. Has been a factor in raising the manufacturing cost of the equipment that is embedded. Moreover, in order to reduce the risk of accidents such as electric shock, it is necessary to lower the output voltage of the electricity storage device. However, reducing the output voltage in this way causes a reduction in the energy density of the electricity storage device.

  An object of the present invention is to improve the safety when handling an electricity storage device by freely setting the timing at which ions are supported on at least one of the negative electrode and the positive electrode, that is, the timing at which voltage is generated in the electricity storage device. There is.

  The electricity storage device of the present invention is an electricity storage device having a negative electrode, a positive electrode, an ion supply source, and an electrolyte system capable of transferring ions, and the ion supply source includes at least one of the negative electrode and the positive electrode. By assembling an insulating element between them and applying energy from the outside of the outer container, at least one of the negative electrode and the positive electrode and the ion supply source are short-circuited, and ions are released from the ion supply source. It is characterized by that.

  In the electricity storage device of the present invention, the energy applied to the outer container is pressure energy.

  In the electricity storage device of the present invention, at least one of the negative electrode and the positive electrode is formed with a protruding portion facing the insulating element, and the protruding portion penetrates the insulating element, whereby the negative electrode and the positive electrode At least one of them and the ion supply source are short-circuited.

  In the electricity storage device of the present invention, the ion supply source includes an ion supply metal and a metal member connected thereto, and at least one of the negative electrode, the positive electrode, and the metal member is opposed to the insulating element. A protrusion is formed, and the insulating element is penetrated by the protrusion to short-circuit at least one of the negative electrode and the positive electrode and the metal member.

  The electricity storage device according to the present invention is characterized in that the protrusion is formed in a stacked region where the negative electrode and the positive electrode are stacked.

  The electricity storage device of the present invention is characterized in that the protrusion is formed in a bonding region where a plurality of the negative electrodes or a plurality of the positive electrodes are bonded.

  The energy storage device according to the present invention is characterized in that the energy applied to the exterior container is thermal energy.

  The electricity storage device of the present invention is characterized in that the insulating element is a heat shrinkable material that shrinks by heat energy.

  The electricity storage device of the present invention is characterized in that at least one of the negative electrode and the positive electrode and the ion supply source are connected via a heat-sensitive element that is brought into conduction by thermal energy.

  In the electricity storage device of the present invention, the ion supply source includes an ion supply metal and a metal member connected to the ion supply metal, the heat shrinkable material is disposed to face the metal member, and shrinks the heat shrinkable material. Thus, at least one of the negative electrode and the positive electrode and the metal member are short-circuited.

  In the electricity storage device of the present invention, the ion supply source includes an ion supply metal and a metal member connected thereto, the heat sensitive element is connected to the metal member, and the heat sensitive element is turned on. The metal member is short-circuited with at least one of the negative electrode and the positive electrode.

  The electricity storage device of the present invention is characterized in that the heat shrinkable material is formed of a porous material.

  In the electricity storage device of the present invention, the heat sensitive element is a bimetal or a thermistor.

  According to the present invention, an insulating element is assembled between at least one of the negative electrode and the positive electrode and the ion supply source, and energy is applied from the outside of the outer container, so that at least one of the negative electrode and the positive electrode and ions Since the supply source is short-circuited, it is possible to freely set the timing for carrying ions on at least one of the negative electrode and the positive electrode. That is, since the timing for generating a voltage in the power storage device can be freely set, it is possible to improve safety when handling the power storage device in a manufacturing process or the like.

  FIG. 1 is a perspective view showing the internal structure of an electricity storage device 10 according to an embodiment of the present invention, and FIGS. 2A and 2B are cross-sectional views showing the internal structure of the electricity storage device 10. 2A shows a state before the lithium ion is supported on the negative electrode 11, and FIG. 2B shows a state where the lithium ion is supported on the negative electrode 11.

  As shown in FIG. 1, electrode lamination units 14 are arranged inside the laminate films 13 a and 13 b constituting the outer container 13 of the electricity storage device 10, and the electrode lamination units 14 are alternately laminated via separators 15. The positive electrode 12 and the negative electrode 11 are formed. Further, a lithium ion supply source (ion supply source) 16 is disposed above the electrode laminate unit 14 so as to face the negative electrode 11, and the electrode laminate unit 14 and the lithium ion supply source 16 constitute a three-electrode laminate unit 17. Is configured. An electrolyte solution (electrolyte system) capable of transporting lithium ions is injected into the laminate films 13a and 13b that are sealed by thermal welding or the like.

  As shown in FIG. 2A, the positive electrode 12 includes a positive electrode current collector 12a having a large number of through holes, and a positive electrode active material layer 12b provided integrally with the positive electrode current collector 12a. The negative electrode 11 includes a negative electrode current collector 11a having a large number of through holes and a negative electrode active material layer 11b provided integrally with the negative electrode current collector 11a. A separator 15 is provided between the positive electrode 12 and the negative electrode 11, and the insulating state between the positive electrode 12 and the negative electrode 11 is maintained by the separator 15. Moreover, the some positive electrode collector 12a is mutually connected in the junction part 12c, and the positive electrode terminal 18 is connected to this junction part 12c. Similarly, the plurality of negative electrode current collectors 11a are connected to each other at a joint portion 11c, and a negative electrode terminal 19 is connected to the joint portion 11c. When forming the outer container 13 by sealing the laminate films 13a and 13b, the laminate films 13a and 13b are welded in a state where the positive electrode terminal 18 and the negative electrode terminal 19 are sandwiched between the positive electrode terminal 18 and The tip of the negative electrode terminal 19 is projected outside the electricity storage device 10.

  The electric storage device 10 shown in the figure causes the positive electrode active material layer 12b of the positive electrode 12 to contain a positive electrode active material capable of reversibly carrying lithium ions and anions, thereby accumulating electric charge in the positive electrode 12 using the electric double layer. On the other hand, the negative electrode active material layer 11b of the negative electrode 11 contains a negative electrode active material capable of reversibly supporting lithium ions, so that charges are accumulated in the negative electrode 11 by reversibly supporting lithium ions. It has become. In addition, lithium ion is supported (doped) in advance on the negative electrode 11 to lower the potential of the negative electrode 11 and increase the capacity of the negative electrode 11, thereby greatly improving the energy density compared to the conventional electric double layer capacitor. It is possible.

  As described above, the lithium ion supply source 16 is provided in the electricity storage device 10 in order to carry lithium ions in advance on the negative electrode 11, and the lithium ion supply source 16 is a lithium ion having a large number of through holes. The electrode current collector 16a is composed of a metal lithium 16b integrated therewith. A separator 20 as an insulating element is sandwiched between the negative electrode 11 and the lithium ion supply source 16, and the insulating state between the negative electrode 11 and the lithium ion supply source 16 is maintained by the separator 20. In this way, by adopting a structure that maintains the insulation state between the negative electrode 11 and the lithium ion supply source 16, even when the electrolyte is injected into the laminate films 13a and 13b, the ionization from the metal lithium 16b is performed. Thus, lithium ions are not released into the electrolytic solution, and the lithium ion is not supported on the negative electrode 11 in a structure. That is, even if the electricity storage device 10 is completed, since lithium ions are not supported on the negative electrode 11, the potential of the negative electrode 11 does not decrease and no voltage is generated in the electricity storage device 10. It becomes possible to handle the electricity storage device 10 safely in an assembling process or the like.

  Next, a structure and procedure for supporting lithium ions on the negative electrode 11 in order to cause the electricity storage device 10 to function as a power source will be described. 3A is an enlarged sectional view showing the vicinity of the lithium ion supply source 16 in FIG. 2A, and FIG. 3B is an enlarged sectional view showing the vicinity of the lithium ion supply source 16 in FIG. 2B. FIG. As shown in FIG. 3A, the negative electrode 11 facing the lithium ion supply source 16 through the separator 20 has a structure including the negative electrode active material layer 11b only on one surface of the negative electrode current collector 11a. A large number of protrusions 21 are formed on the other surface of the negative electrode current collector 11 a where the negative electrode active material layer 11 b is not formed, that is, on the surface facing the lithium ion supply source 16. When the negative electrode 11 is loaded with lithium ions, as shown in FIGS. 2B and 3B, a predetermined pressure (pressure energy) is applied as energy from the outside of the laminate films 13a and 13b. By adding, the separator 20 that insulates the negative electrode 11 from the lithium ion supply source 16 can be pierced by the protrusion 21, and the negative electrode 11 and the lithium ion supply source 16 can be short-circuited (electrically contacted). Become.

  Thus, when the negative electrode 11 and the lithium ion supply source 16 are short-circuited in the electrolytic solution, lithium ions are eluted from the lithium ion supply source 16 along with the charge transfer, and the lithium ions are transferred to the negative electrode 11 through the electrolytic solution. It will be carried. As a result, the potential of the negative electrode 11 can be lowered to generate a voltage in the power storage device 10, so that the power storage device 10 can function as a power source. Note that a large number of through holes (not shown) are formed in the negative electrode current collector 11a and the positive electrode current collector 12a, and lithium ions can freely move between the electrodes through the through holes. Lithium ions can be uniformly supported on all the negative electrode active material layers 11b. In addition, the metal lithium 16b decreases while releasing lithium ions, and finally the entire amount is supported on the negative electrode 11. However, a large amount of the metal lithium 16b is disposed and a part of the metal lithium 16b is stored in the electricity storage device 10. It may be allowed to remain.

  As described so far, in the electricity storage device 10 according to one embodiment of the present invention, the separator 20 is assembled between the negative electrode current collector 11a and the lithium ion supply source 16, and the lithium ion supply source 16 is Since the protrusions 21 are formed on the opposing negative electrode current collector 11 a, the negative electrode 11 and the lithium ion supply source 16 are brought into electrical contact by applying pressure from the outside of the completed power storage device 10. It becomes possible. Thereby, since the timing at which the negative electrode 11 is loaded with lithium ions, that is, the timing at which the power storage device 10 generates voltage can be freely set, it is possible to improve the safety when the power storage device 10 is handled. It becomes. In addition, since the electricity storage device 10 can be completed without generating a voltage, facilities for handling the electricity storage device 10 and the like can be simplified, and the cost of a device in which the electricity storage device 10 is incorporated can be reduced. It becomes possible. Furthermore, since it is not necessary to lower the output voltage of the power storage device 10 in order to increase safety, for example, when a high voltage pack is manufactured by connecting a plurality of power storage devices 10, while maintaining the voltage of the high voltage pack The number of power storage devices 10 can be reduced, and the volume efficiency of the high voltage pack can be improved.

  Subsequently, the power storage device 10 described above will be described in detail in the following order. [A] negative electrode, [B] positive electrode, [C] positive electrode current collector and negative electrode current collector, [D] ion supply source, [E] insulating element, [F] electrolyte solution, [G] exterior container, [H] ] A method of manufacturing an electricity storage device. In addition, although the structure and manufacturing method are demonstrated regarding the electrical storage device 10, these structures and manufacturing methods are also applicable to the electrical storage devices 30-100 mentioned later.

[A] Negative Electrode In the electricity storage device 10 of the present invention, the negative electrode 11 has a negative electrode current collector 11a and a negative electrode active material layer 11b integrated therewith, and the negative electrode active material layer 11b is reversible with lithium ions. The negative electrode active material which can be doped and dedoped is contained. The negative electrode active material is not particularly limited as long as it can reversibly carry lithium ions. Examples thereof include graphite, various carbon materials, polyacene-based materials, tin oxide, and silicon oxide. it can. Particularly, a polyacene organic semiconductor (PAS), which is a heat-treated product of an aromatic condensation polymer and has a hydrogen atom / carbon atom number ratio (H / C) of 0.50 to 0.05, is suitable as a negative electrode active material. It is. Since this PAS has an amorphous structure, there is no structural change such as swelling / shrinkage with respect to doping / dedoping of lithium ions, and it has excellent cycle characteristics, and isotropic to doping / dedoping of lithium ions. Due to its molecular structure, it has excellent characteristics for rapid charge and rapid discharge.

  The negative electrode active material such as PAS described above is formed into a powder form, a granular form, a short fiber form, etc., and this negative electrode active material is mixed with a binder to form a slurry. And the negative electrode active material layer 11b is formed on the negative electrode collector 11a by apply | coating the slurry containing a negative electrode active material to the negative electrode collector 11a, and making it dry. As the binder mixed with the negative electrode active material, for example, a rubber binder such as SBR, a fluorine-containing resin such as polytetrafluoroethylene or polyvinylidene fluoride, or a thermoplastic resin such as polypropylene or polyethylene is used. Among these, it is preferable to use a fluorine-based binder. Moreover, you may make it add electrically conductive materials, such as acetylene black, a graphite, and a metal powder, with respect to the negative electrode active material layer 11b suitably. In the present invention, the negative electrode 11 is an electrode in which a negative electrode active material layer is applied to one side and / or both sides of a negative electrode current collector.

[B] Positive Electrode In the electricity storage device 10 of the present invention, the positive electrode 12 has a positive electrode current collector 12a and a positive electrode active material layer 12b integrated therewith, and the positive electrode active material layer 12b has lithium ions and anions. A positive electrode active material capable of reversibly supporting (for example, tetrafluoroborate) is contained. The positive electrode active material is not particularly limited as long as it can reversibly carry lithium ions and anions, and examples thereof include activated carbon, a conductive polymer, and a polyacene-based material. In addition, when PAS, which is a heat-treated product of an aromatic condensation polymer and H / C is 0.50 to 0.05, is used as the positive electrode active material, it is preferable because the capacity can be increased. is there.

  The positive electrode active material such as PAS described above is formed into a powder form, a granular form, a short fiber form, etc., and this positive electrode active material is mixed with a binder to form a slurry. And the positive electrode active material layer 12b is formed on the positive electrode collector 12a by apply | coating the slurry containing a positive electrode active material to the positive electrode collector 12a, and drying it. As the binder mixed with the positive electrode active material, for example, a rubber-based binder such as SBR, a fluorine-containing resin such as polytetrafluoroethylene or polyvinylidene fluoride, or a thermoplastic resin such as polypropylene or polyethylene can be used. . Moreover, you may make it add electrically conductive materials, such as acetylene black, a graphite, and a metal powder, with respect to the positive electrode active material layer 12b suitably. In the present invention, an electrode in which a positive electrode active material layer is applied to one side and / or both sides of a positive electrode current collector is referred to as a positive electrode 12.

[C] Positive electrode current collector and negative electrode current collector As the positive electrode current collector 12a and the negative electrode current collector 11a used in the electricity storage device 10 of the present invention, those having through holes penetrating the front and back surfaces are suitable. Examples thereof include expanded metal, punching metal, net, foam and the like. The shape and number of the through holes are not particularly limited, and can be appropriately set as long as they do not inhibit the movement of lithium ions. In addition, as materials for the positive electrode current collector 12a and the negative electrode current collector 11a, various materials generally proposed for organic electrolyte batteries can be used. For example, aluminum, stainless steel, or the like can be used as the material of the positive electrode current collector 12a, and stainless steel, copper, nickel, or the like can be used as the material of the negative electrode current collector 11a.

  In addition, in order to short-circuit the negative electrode 11 and the ion supply source 16 to make electrochemical contact, a large number of protrusions 21 are formed on one of the negative electrode current collectors 11a. It is not limited to the shape, the number, and the like, and is appropriately set according to the magnitude of the applied pressure, the type of the separator 20, and the like. For example, the shape of the protrusion 21 is not limited to the illustrated cone shape, and can be set as appropriate as long as it has an uneven shape such as a triangular pyramid shape, a cylindrical shape, or a hemispherical shape. Further, when forming the protrusion 21 on the negative electrode current collector 11a, the protrusion 21 may be formed by pressing, or the protrusion 21 may be formed by sandblasting, etching, or the like. Furthermore, the protrusion 21 may be formed on the negative electrode current collector 11a by depositing metal particles on the surface of the negative electrode current collector 11a. Further, when a punching metal or the like is used as the negative electrode current collector 11a, a burr generated when the through hole is formed can be used as the protruding portion 21.

[D] Ion supply source The electricity storage device 10 of the present invention is provided with a lithium ion supply source 16, which includes a lithium electrode current collector 16 a made of a conductive porous material such as a stainless mesh. , And metal lithium 16b attached thereto. Further, instead of the metal lithium 16b constituting the lithium ion supply source 16, an alloy capable of supplying lithium ions such as a lithium-aluminum alloy may be used. In addition, while supporting the metallic lithium 16b by the lithium electrode current collector 16a and bringing the negative electrode current collector 11a and the lithium electrode current collector 16a into contact with each other when supporting lithium ions, the loss of the metal lithium 16b is accompanied. Thus, the gap between the electrodes can be reduced, and lithium ions can be smoothly supported on the negative electrode 11. Further, the thickness of the lithium electrode current collector 16a is preferably about 10 to 200 μm, and the thickness of the metal lithium 16b is preferably about 50 to 300 μm although it depends on the amount of the negative electrode active material. The lithium electrode current collector 16a can be formed of the same material as the negative electrode current collector 11a and the positive electrode current collector 12a.

[E] Insulating element The separators 15 and 20 used in the electricity storage device 10 of the present invention are durable against an electrolyte, a positive electrode active material, a negative electrode active material, and the like, and do not have electrical conductivity having continuous air holes. A porous body etc. can be used. As the material of the separators 15 and 20, known materials such as cellulose (paper), polyethylene, and polypropylene can be used. Further, the separator 20 disposed between the negative electrode 11 and the lithium ion supply source 16 is not limited to the above-described material, and an insulating film is formed on the surface of the negative electrode current collector 11a or the lithium electrode current collector 16a. By forming it, it is possible to make this insulating film function as the separator 20.

[F] Electrolytic Solution For the electricity storage device 10 of the present invention, an electrolytic solution capable of transferring lithium ions is used. As this electrolytic solution, it is preferable to use an aprotic organic solvent containing a lithium salt from the viewpoint that electrolysis does not occur even at a high voltage and that lithium ions can exist stably. Examples of the aprotic organic solvent include solvents in which ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, γ-butyrolactone, acetonitrile, dimethoxyethane, tetrahydrofuran, dioxolane, methylene chloride, sulfolane and the like are used alone or in combination. Examples of the lithium salt include _{LiI, LiClO 4, LiAsF 6,} LiBF 4, LiPF 6 , and the like. The electrolyte concentration in the electrolytic solution is preferably at least 0.1 mol / l or more in order to reduce the internal resistance due to the electrolytic solution, and should be in the range of 0.5 to 1.5 mol / l. Is more preferable. A gel electrolyte solution (electrolyte system) may be used, or a solid electrolyte (electrolyte system) may be used.

[G] Exterior Container As the exterior container 13 used for the electricity storage device 10 of the present invention, various materials generally used for batteries can be used, and metal materials such as iron and aluminum may be used. A film material or the like may be used. Further, the shape of the outer container 13 is not particularly limited, and can be appropriately selected according to the use such as a cylindrical shape or a rectangular shape. From the viewpoint of miniaturization and weight reduction of the electricity storage device 10. It is preferable to use a film-type outer container 13 using aluminum laminate films 13a and 13b. In general, three-layer laminate films 13a and 13b having a nylon film on the outside, an aluminum foil at the center, and an adhesive layer such as modified polypropylene on the inside are used. In addition, the laminate films 13a and 13b are generally deep-drawn in accordance with the size of the electrodes and the like that enter the inside, and the electrode lamination unit 14 is installed in the deep-drawn laminate films 13a and 13b. After injecting the electrolytic solution, the outer peripheral portions of the laminate films 13a and 13b are sealed by heat welding or the like.

[H] Method for Manufacturing Power Storage Device An example of the method for manufacturing the power storage device in the present invention will be described below.

(Production method of negative electrode)
A slurry for forming the negative electrode active material layer 11b was obtained by sufficiently mixing 100 parts by weight of the PAS powder in a solution in which 10 parts by weight of the polyvinylidene fluoride powder was dissolved in 80 parts by weight of N-methylpyrrolidone. Subsequently, the negative electrode 11 having a total negative electrode thickness of 148 μm after pressing is applied to the both surfaces of a 32 μm thick copper expanded metal (manufactured by Nippon Metal Industry Co., Ltd.) by using a die coater to dry the slurry. Obtained. Moreover, the negative electrode 11 whose thickness of the whole negative electrode after a press is set to 148 micrometers is obtained by coating a slurry with a die coater on one side of a 32 μm thick copper expanded metal (manufactured by Nippon Metal Industry Co., Ltd.). It was.

(Method for producing positive electrode)
By fully mixing 100 parts by weight of activated carbon powder having a specific surface area of 1950 m ² / g with a solution of 10 parts by weight of polyvinylidene fluoride powder in 100 parts by weight of N-methylpyrrolidone, positive electrode active material layer 12b A slurry was obtained to form Subsequently, a non-aqueous carbon conductive paint (EB-815 manufactured by Nippon Atson Co., Ltd.) was coated on both sides of an aluminum expanded metal (manufactured by Nippon Metal Industry Co., Ltd.) with a thickness of 35 μm by a spray method and dried. As a result, a positive electrode current collector 12a on which a conductive layer was formed was obtained. The thickness of the positive electrode current collector 12a (the total of the current collector thickness and the conductive layer thickness) was 52 μm, and the through-hole formed in the positive electrode current collector 12a was almost blocked by the conductive paint. And the positive electrode 12 from which the thickness of the whole positive electrode after a press was set to 182 micrometers was obtained by apply | coating a slurry with a roll coater and drying on both surfaces of the positive electrode collector 12a in which the conductive layer was formed.

(Method for manufacturing electrode laminate unit)
The negative electrode 11 was cut to a size of 6.0 cm × 7.5 cm (excluding the bonding portion 11 c), and the positive electrode 12 was cut to a size of 5.8 cm × 7.3 cm (excluding the bonding portion 12 c). Subsequently, the cellulose / rayon mixed nonwoven fabric (thickness: 35 μm) as the separator 15 is sandwiched therebetween, and the positive electrode 12 and the negative electrode 11 are bonded while the joint portions 11c and 12c of the positive electrode 12 and the negative electrode 11 are directed to the opposite sides. Alternatingly stacked. Then, the junction (three pieces) 12c of the positive electrode current collector 12a and the positive electrode terminal 18 (width 50 mm, thickness 0.2 mm) made of aluminum are ultrasonically welded, and the junction ( 3 sheets) 11c and the copper negative electrode terminal 19 (width 50 mm, thickness 0.2 mm) were ultrasonically welded to obtain the electrode laminated unit 14. The electrode laminate unit 14 has five electrode pairs each composed of a pair of the positive electrode 12 and the negative electrode 11, but the number of electrode pairs is not limited to the number of layers shown in the figure, and one electrode layer The electrode laminate unit may be constituted by a pair, and the electrode laminate unit may be constituted by two or more electrode pairs.

(Assembly method of power storage device)
Subsequently, a lithium ion supply source 16 facing the negative electrode 11 through the separator 20 is disposed above the electrode lamination unit 14 to obtain a three-electrode lamination unit 17 including the positive electrode 12, the negative electrode 11, and the lithium ion supply source 16. It was. As the lithium ion supply source 16, a stainless steel net (thickness 80 μm) and a metal lithium foil (thickness 82 μm, size 6.0 cm × 7.5 cm) were used. Further, in order to avoid a short circuit with the outer container 13, after the separator 22 is wound around the three-pole laminated unit 17, this three-pole laminated unit 17 is placed inside the laminated films 13a and 13b deeply drawn by 6.5 mm, and laminated. Three sides of the films 13a and 13b were welded. Next, an electrolyte solution in which LiPF ₆ having a concentration of 1 mol / L is dissolved in a mixed solvent of ethylene carbonate, diethyl carbonate and propylene carbonate in a weight ratio of 3: 4: 1 is vacuum impregnated in the laminate films 13a and 13b. It was. And the film type electrical storage device 10 was assembled by welding the remaining 1 side of the laminate films 13a and 13b.

  Thus, in the state where the electricity storage device 10 is assembled, since no lithium ions are supported on the negative electrode 11, no voltage is generated in the electricity storage device 10. Therefore, in order to cause the negative electrode 11 and the lithium ion supply source 16 to come into contact with each other to carry lithium ions on the negative electrode 11, 1 atmosphere (gauge pressure) is applied to the assembled electricity storage device 10 for 10 days using a pressure device. Pressurization continued. Then, when the electrical storage device 10 was disassembled, the metal lithium 16b in the electrical storage device 10 was completely lost, so it was determined that lithium ions were supported on the negative electrode 11.

  In the above description, lithium ions are supported on the negative electrode 11. However, the present invention is not limited to this. By bringing the positive electrode 12 and the lithium ion supply source 16 into contact with each other, the positive electrode 12 is contacted. Thus, lithium ions may be supported. Further, by incorporating a plurality of lithium ion supply sources 16, each of the negative electrode 11 and the positive electrode 12 is brought into contact with the lithium ion supply source 16 so that lithium ions are supported on each of the negative electrode 11 and the positive electrode 12. Anyway. Further, even when lithium ions are supported on one of the negative electrode 11 and the positive electrode 12, by incorporating a plurality of lithium ion supply sources 16, the lithium ions can be supported in multiple steps. good. By adopting such a structure, it is possible to carry lithium ions according to the deterioration state of the electricity storage device 10, and it is possible to restore the capacity of the electricity storage device 10 as necessary. However, when activated carbon is used for the positive electrode 12, for example, when the amount of lithium ions supported increases and the positive electrode potential decreases, lithium ions are consumed irreversibly and the capacity of the cell decreases. Therefore, it is necessary to appropriately control the amount of lithium ions supplied to the negative electrode 11 and the positive electrode 12 so as not to cause a problem.

  As described above, since the protrusion 21 is formed on the negative electrode current collector 11 a facing the lithium ion supply source 16, the separator 20 is applied by applying pressure from the outside of the completed power storage device 10. Can be penetrated by the protruding portion 21, and the negative electrode 11 and the lithium ion supply source 16 can be short-circuited. Thereby, since the timing at which the negative electrode 11 is loaded with lithium ions, that is, the timing at which the power storage device 10 generates voltage can be freely set, it is possible to improve the safety when the power storage device 10 is handled. It becomes.

  Next, another embodiment of the present invention will be described. 4 is a perspective view showing the internal structure of an electricity storage device 30 according to another embodiment of the present invention, and FIGS. 5A and 5B are cross-sectional views showing the internal structure of the electricity storage device 30. FIG. FIG. 5A shows a state before lithium ions are supported on the negative electrode 11, and FIG. 5B shows a state where lithium ions are supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 4 and 5A, a lithium ion supply source (ion supply source) 31 disposed above the electrode laminate unit 14 is composed of a metal plate (metal member) 31a and a metal lithium integrated with the metal plate (metal member) 31a. 31b, and is opposed to the negative electrode 11 with the separator 20 in between. Further, the metal plate 31a constituting the lithium ion supply source 16 is constituted by a support plate portion 32 to which the metal lithium 31b is attached and a connection plate portion 34 in which a plurality of protrusions 33 are formed. Furthermore, a plurality of protrusions 35 are formed on the facing surface of the negative electrode current collector 11 a that faces the connection plate portion 34 with the separator 15 interposed therebetween.

  As described above, the separator 20 is assembled between the negative electrode 11 and the lithium ion supply source 31, and the protrusion 33 is formed on the metal plate 31a constituting the lithium ion supply source 31, and the negative electrode current collector facing the metal plate 31a. Since the projecting portion 35 is formed on the body 11a, the negative electrode 11 and the lithium ion supply source 31 are applied as shown in FIG. And the lithium ion can be supported on the negative electrode 11. That is, when the negative electrode 11 and the lithium ion supply source 31 are connected, the metal plate 31a and the negative electrode current collector 11a are connected, so that the metal lithium 31b decreases as lithium ions are released. Even if it exists, it can hold | maintain the connection state of the negative electrode 11 and the lithium ion supply source 31 reliably, and it becomes possible to carry | support lithium ion with respect to the negative electrode 11 reliably. In the illustrated case, the protrusion 33 is formed on the metal plate 31a and the protrusion 35 is formed on the negative electrode current collector 11a. However, the present invention is not limited to this, and the protrusion is formed only on the metal plate 31a. The portion 33 may be formed, or the protrusion 35 may be formed only on the negative electrode current collector 11a.

  Next, another embodiment of the present invention will be described. FIG. 6 is a perspective view showing the internal structure of an electricity storage device 40 according to another embodiment of the present invention, and FIGS. 7A and 7B are cross-sectional views showing the internal structure of the electricity storage device 40. FIG. FIG. 7A shows a state before the lithium ion is supported on the negative electrode 11, and FIG. 7B shows a state where the lithium ion is supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 7A, a lithium ion supply source (ion supply source) 41 disposed above the electrode laminate unit 14 faces the negative electrode 11 with a separator (insulating element) 42 therebetween. The end portion of the negative electrode 11 extends to the joint 11c. The lithium ion supply source 41 includes a lithium electrode current collector 41a having a large number of through holes and a metal lithium 41b provided integrally therewith. The lithium electrode current collector 41a is connected to the joint 11c. It is provided so as to face each other. Furthermore, a plurality of protrusions 43 are formed on the surface of the joint 11c facing the lithium electrode current collector 41a.

  As described above, the lithium ion supply source 41 is disposed on the joint portion 11c via the separator 42, and the plurality of protrusions 43 are formed on the joint portion 11c, which is a joint region. As shown in FIG. 7B, the negative electrode 11 and the lithium ion supply source 41 can be short-circuited so that the negative electrode 11 can carry lithium ions by applying pressure on the joint portion 11c. That is, by applying pressure to a region outside the laminated region of the positive electrode 12 and the negative electrode 11, even when a large pressure is applied, lithium ions are supported on the negative electrode 11 without affecting the electrode laminated unit 14. It becomes possible to make it.

  Next, another embodiment of the present invention will be described. 8 is a perspective view showing the internal structure of an electricity storage device 50 according to another embodiment of the present invention, and FIGS. 9A and 9B are cross-sectional views showing the internal structure of the electricity storage device 50. FIG. FIG. 9A shows a state before lithium ions are supported on the negative electrode 11, and FIG. 9B shows a state where lithium ions are supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 8 and 9A, a lithium ion supply source (ion supply source) 51 disposed above the electrode laminate unit 14 is opposed to the negative electrode 11 with a separator (insulating element) 52 interposed therebetween. The end portion of the negative electrode 11 extends to the joint 11c. Further, the lithium ion supply source 51 includes a metal plate 51a facing the joint 11c and a metal lithium 51b facing the negative electrode 11, and the metal plate 51a and the metal lithium 51b are integrally joined. . Furthermore, a plurality of protrusions 53 and 54 are formed on the metal plate 51 a and the joint 11 c that face each other with the separator 52 interposed therebetween.

  As described above, the lithium ion supply source 51 is disposed on the joint portion 11c via the separator 52, and the plurality of protrusions 53 and 54 are formed on the metal plate 51a and the joint portion 11c. As shown in FIG. 8 (B), the negative electrode 11 and the lithium ion supply source 51 are short-circuited so that the negative electrode 11 carries lithium ions by applying pressure on the bonding portion 11c which is a bonding region from the outside of the electrode. Is possible. That is, by applying pressure to a region outside the laminated region of the positive electrode 12 and the negative electrode 11, even when a large pressure is applied, lithium ions are supported on the negative electrode 11 without affecting the electrode laminated unit 14. It becomes possible to make it. In addition, when the negative electrode 11 and the lithium ion supply source 51 are connected, the metal plate 51a and the joint portion 11c are short-circuited, so that the metal lithium 51b decreases as lithium ions are released. However, the connection state between the negative electrode 11 and the lithium ion supply source 51 can be reliably maintained, and lithium ions can be reliably supported on the negative electrode 11. In the illustrated case, the protrusion 53 is formed on the metal plate 51a and the protrusion 54 is formed on the joint 11c. However, the present invention is not limited to this, and the protrusion 53 is formed only on the metal plate 51a. The protrusion 54 may be formed only in the joint 11c.

  Next, another embodiment of the present invention will be described. FIGS. 10A and 10B are cross-sectional views showing the internal structure of an electricity storage device 60 according to another embodiment of the present invention, and FIGS. 11A and 11B are negative electrodes used in the electricity storage device 60. It is explanatory drawing which shows the manufacture procedure of the electrical power collector 61. FIG. FIG. 10A shows a state before lithium ions are supported on the negative electrode 11, and FIG. 10B shows a state where lithium ions are supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  First, as shown in FIG. 10A, the negative electrode current collector 61 facing the lithium ion supply source 16 is formed of expanded metal, and the irregularities of the expanded metal serve as protrusions 62 for penetrating the separator 15. It is supposed to function. As shown in FIGS. 11A and 11B, the expanded metal is manufactured by pulling a metal foil having a plurality of slits in the longitudinal direction, and the finished expanded metal has a plurality of irregularities in the thickness direction. Is done. By assembling such an expanded metal as the negative electrode current collector 61, the negative electrode 11 and the lithium ion supply source 16 are connected by applying pressure from the outside of the outer container 13 as shown in FIG. Thus, lithium ions can be supported on the negative electrode 11. As described above, by using the expanded metal, it is possible to reduce the manufacturing process for forming the protrusion 62 on the negative electrode current collector 61, and thus it is possible to reduce the cost of the electricity storage device 60. Become.

  Next, another embodiment of the present invention will be described. FIG. 12 is a perspective view showing the internal structure of an electricity storage device 70 according to another embodiment of the present invention, and FIGS. 13A and 13B are cross-sectional views showing the internal structure of the electricity storage device 70. FIG. FIG. 13A shows a state before lithium ions are supported on the negative electrode 11, and FIG. 13B shows a state where lithium ions are supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 12 and 13A, a lithium ion supply source (ion supply source) 71 disposed above the electrode laminate unit 14 faces the negative electrode 11 with a separator (insulating element) 72 therebetween. The end portion of the negative electrode 11 extends to the joint 11c. The lithium ion supply source 71 includes a lithium electrode current collector 71a having a large number of through-holes and metal lithium 71b provided integrally therewith. The lithium electrode current collector 71a is connected to the junction 11c. It is provided so as to face each other. Furthermore, a heat shrinkable material 73 that shrinks by heat energy is provided as a separator (insulating element) between the junction 11c and the lithium electrode current collector 71a. Examples of the heat-shrinkable material 73 include a film such as polyolefin, but a heat-shrinkable material formed of other materials may be used as long as it is an insulating material that shrinks by heat energy.

  As described above, since the insulating state between the negative electrode 11 and the lithium ion supply source 71 is maintained via the heat shrinkable material 73, heat (heat energy) is applied as energy from the outside of the outer container 13 and the heat shrinkable material 73. As shown in FIG. 13B, the negative electrode 11 and the lithium ion supply source 71 can be short-circuited so that the negative electrode 11 can carry lithium ions. As described above, by applying heat from the outside, even when lithium ions are supported on the negative electrode 11, the timing for supporting lithium ions, that is, the timing for generating a voltage in the electricity storage device 70 can be freely set. Therefore, it is possible to improve safety when handling the electricity storage device 70. Since the inside of the outer container 13 is kept almost in a vacuum state, the negative electrode 11 and the lithium ion supply source 71 can be short-circuited by the atmospheric pressure by contracting the heat shrinkable material 73.

  Next, another embodiment of the present invention will be described. FIG. 14 is a perspective view showing the internal structure of an electricity storage device 80 according to another embodiment of the present invention, and FIGS. 15A and 15B are cross-sectional views showing the internal structure of the electricity storage device 80. FIG. FIG. 15A shows a state before lithium ions are supported on the negative electrode 11, and FIG. 15B shows a state where lithium ions are supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 14 and 15A, a lithium ion supply source (ion supply source) 81 disposed above the electrode stack unit 14 is connected to the negative electrode 11 via a heat shrinkable material 82 that functions as an insulating element. While facing each other, the end portion is formed to extend to the joint portion 11 c of the negative electrode 11. The lithium ion supply source 81 includes a lithium electrode current collector 81a having a large number of through holes and a metal lithium 81b integrated with the lithium electrode current collector 81a. The heat-shrinkable material 82 that shrinks by heat energy is formed of a porous material and includes a large number of through-holes that penetrate in the thickness direction.

  As described above, since the insulating state between the negative electrode 11 and the lithium ion supply source 81 is maintained via the heat shrinkable material 82, the heat shrinkable material is contracted by applying heat from the outside of the outer container 13. As shown in FIG. 15B, the negative electrode 11 and the lithium ion supply source 81 can be short-circuited, and lithium ions can be carried on the negative electrode 11. Further, since the heat shrink material 82 is formed of a porous material, lithium ions can be moved through the through-holes of the heat shrink material 82, so that lithium ions are uniformly supported on the negative electrode 11. Is possible. Furthermore, since the insulating element between the negative electrode 11 and the lithium ion supply source 81 can be made one type, it is possible to achieve a reduction in the cost of the power storage device 80 compared to the power storage device 70 shown in FIG. It becomes.

  Next, another embodiment of the present invention will be described. FIG. 16 is a perspective view showing the internal structure of an electricity storage device 90 according to another embodiment of the present invention, and FIGS. 17A and 17B are cross-sectional views showing the internal structure of the electricity storage device 90. FIG. FIG. 17A shows a state before lithium ions are supported on the negative electrode 11, and FIG. 17B shows a state where lithium ions are supported on the negative electrode 11. In addition, about the member same as the member shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 16 and 17A, a lithium ion supply source (ion supply source) 91 disposed above the electrode laminate unit 14 is provided so as to face the negative electrode 11 with the separator 20 interposed therebetween. Yes. The lithium ion supply source 91 includes a lithium metal 91b that faces the negative electrode current collector 11a via the separator 20, and a lithium electrode current collector 91a that supports the metal lithium 91b. A bimetal 92, which is a heat sensitive element, is provided between the lithium electrode current collector 91a and the joint 11c. The bimetal 92 has a structure in which metal pieces having different thermal expansion coefficients are bonded to each other, and can be switched between a conductive state and a disconnected state depending on the temperature.

  Thus, since the negative electrode 11 and the lithium ion supply source 91 are connected via the bimetal 92, heat (thermal energy) is applied as energy from the outside of the outer container 13 to switch the bimetal 92 to a conductive state. Thus, as shown in FIG. 17B, the negative electrode 11 and the lithium ion supply source 91 can be connected, and lithium ions can be carried on the negative electrode 11. Further, the heat sensitive element is not limited to the bimetal 92, and a thermistor in which the resistance between terminals greatly changes with temperature change may be assembled as the heat sensitive element.

  Next, another embodiment of the present invention will be described. 18A is a cross-sectional view showing the internal structure of an electricity storage device 100 according to another embodiment of the present invention, and FIGS. 18B and 18C show the internal structure of the electricity storage device 100 within the range of α. FIG. FIG. 18B shows a state before lithium ions are supported on the negative electrode 101, and FIG. 18C shows a state where lithium ions are supported on the negative electrode 101.

  First, as illustrated in FIG. 18A, the illustrated electricity storage device 100 is a wound-type electricity storage device 100 in which an electrode winding unit 102 is accommodated in a metal can 103 as an outer container. The electrode winding unit 102 included in the electricity storage device 100 is formed by overlapping and winding a positive electrode 104, a negative electrode 101, and a separator 105. A lithium ion supply source (ion supply source) 106 is disposed between the electrode winding unit 102 and the metal can 103, and a separator as an insulating element is provided between the lithium ion supply source 106 and the negative electrode 101. 107 is provided. Furthermore, the electricity storage device 100 includes a rod-like positive electrode terminal 108 and a negative electrode terminal 109 that protrude from the metal can 103, and an end of the positive electrode 104 is connected to the positive electrode terminal 108, while a negative electrode is connected to the negative electrode terminal 109. The end of 101 is connected. Note that an electrolytic solution (electrolyte system) capable of transporting lithium ions is injected into the metal can 103.

  As shown in FIG. 18B, the positive electrode 104 includes a positive electrode current collector 104a having a large number of through holes, and a positive electrode active material layer 104b provided integrally with the positive electrode current collector 104a. The negative electrode 101 includes a negative electrode current collector 101a having a large number of through holes, and a negative electrode active material layer 101b provided integrally with the negative electrode current collector 101a. A separator 105 is provided between the positive electrode 104 and the negative electrode 101, and the insulating state between the positive electrode 104 and the negative electrode 101 is maintained by the separator 105. Further, the lithium ion supply source 106 facing the negative electrode 101 with the separator 107 interposed therebetween is constituted by a lithium electrode current collector 106a having a large number of through holes and metal lithium 106b provided integrally therewith. Further, the negative electrode 101 facing the lithium ion supply source 106 has a structure including the negative electrode active material layer 101b only on one surface of the negative electrode current collector 101a, and the negative electrode current collector in which the negative electrode active material layer 101b is not formed. A large number of protrusions 110 are formed on the other surface of the electric body 101 a, that is, the surface facing the lithium ion supply source 106. When the lithium ion is supported on the negative electrode 101, as shown in FIG. 18C, a predetermined pressure (pressure energy) is applied as energy from the outside of the metal can 103, so that the negative electrode 101 and the lithium The separator 107 between the ion source 106 and the ion source 106 can be pierced by the protrusion 110, and the negative electrode 101 and the lithium ion source 106 can be brought into electrical contact.

  In this manner, even in the wound type power storage device 100, the separator 107 is assembled between the negative electrode current collector 101a and the lithium ion supply source 106, and the negative electrode current collector 101a facing the lithium ion supply source 106 is attached. On the other hand, since the protrusion 110 is formed, the negative electrode 101 and the lithium ion supply source 106 can be brought into electrical contact with each other by applying pressure from the outside of the completed power storage device 100. Thereby, since the timing at which the negative electrode 101 is loaded with lithium ions, that is, the timing at which the power storage device 100 generates a voltage can be freely set, it is possible to improve the safety when the power storage device 100 is handled. It becomes.

  In the case shown in the drawing, a through-hole for allowing lithium ions to pass through is formed in the negative electrode current collector 101a and the positive electrode current collector 104a, so that the lithium ion supply source is provided only on one side surface of the electrode winding unit 102. 106 is arranged. However, in the case of using a negative electrode current collector or a positive electrode current collector in which no through hole is formed, it is necessary to arrange the lithium ion supply source 106 so as to be sandwiched between the negative electrode 101 and the positive electrode 104. . In the illustrated case, the protrusion 110 is formed on the negative electrode current collector 101a. However, the present invention is not limited to this, and in the case where heat is applied to the electricity storage device 100 to carry lithium ions. A heat shrink material may be incorporated between the negative electrode 101 and the lithium ion supply source 106, and the negative electrode 101 and the lithium ion supply source 106 may be connected via a heat sensitive element.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the power storage device is not limited to a capacitor, and the present invention may be applied to a lithium ion secondary battery as a power storage device. In the above description, a lithium ion supply source that releases lithium ions is arranged as an ion supply source. However, an ion supply source that releases magnesium ions, sodium ions, or the like may be used.

  Further, in the electricity storage devices 70, 80, 90 that carry lithium ions by supplying heat, the negative electrode 11 and the lithium ion supply sources 71, 81, 91 may be short-circuited. That is, in the electricity storage devices 70, 80, 90, it is possible to start supporting lithium ions by applying electric energy from the outside. For example, when charging / discharging performed in an inspection process or the like is used, the heating process of the power storage devices 70, 80, 90 can be omitted, which can reduce the manufacturing cost of the power storage devices 70, 80, 90. It becomes possible.

It is a perspective view which shows the internal structure of the electrical storage device which is one embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. (A) is an enlarged sectional view showing the vicinity of the lithium ion supply source shown in FIG. 2 (A), and (B) is an enlarged sectional view showing the vicinity of the lithium ion supply source shown in FIG. 2 (B). It is a perspective view which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. It is a perspective view which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. It is a perspective view which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. (A) And (B) is sectional drawing which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is explanatory drawing which shows the manufacture procedure of the negative electrode electrical power collector used for an electrical storage device. It is a perspective view which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. It is a perspective view which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. It is a perspective view which shows the internal structure of the electrical storage device which is other embodiment of this invention. (A) And (B) is sectional drawing which shows the internal structure of an electrical storage device. (A) is sectional drawing which shows the internal structure of the electrical storage device which is other embodiment of this invention, (B) and (C) are expanded sectional views which show the internal structure of an electrical storage device in the range of code | symbol (alpha). is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power storage device 11 Negative electrode 12 Positive electrode 13 Exterior container 16 Lithium ion supply source (ion supply source)
20 Separator (insulating element)
21 Protrusion 30 Power Storage Device 31 Lithium Ion Supply Source (Ion Supply Source)
31a Metal plate (metal member)
33 Projection 35 Projection 40 Power Storage Device 41 Lithium Ion Supply Source (Ion Supply Source)
42 Separator (insulating element)
43 Projection 50 Power Storage Device 51 Lithium Ion Supply Source (Ion Supply Source)
51a Metal plate (metal member)
52 Separator (insulating element)
53, 54 Projection 60 Power storage device 62 Projection 70 Power storage device 71 Lithium ion supply source (ion supply source)
72 Separator (insulating element)
73 Heat shrink material (insulating element)
80 Power storage device 81 Lithium ion supply source (ion supply source)
82 Heat shrink material (insulating element)
90 electricity storage device 91 lithium ion supply source (ion supply source)
92 Bimetal (heat sensitive element)
100 Power Storage Device 101 Negative Electrode 103 Metal Can (Exterior Container)
104 Positive electrode 106 Lithium ion supply source (ion supply source)
107 Separator (insulating element)
110 Protrusion

Claims (13)

An electricity storage device having a negative electrode, a positive electrode, an ion supply source, and an electrolyte system capable of transferring ions,
Assembling an insulating element between at least one of the negative electrode and the positive electrode and the ion supply source,
An energy storage device characterized in that, by applying energy from the outside of an outer container, at least one of the negative electrode and the positive electrode and the ion supply source are short-circuited and ions are released from the ion supply source. The electricity storage device according to claim 1, wherein
The energy storage device, wherein the energy applied to the exterior container is pressure energy. The power storage device according to claim 2,
Forming a protrusion facing the insulating element on at least one of the negative electrode and the positive electrode;
An electricity storage device characterized in that at least one of the negative electrode and the positive electrode and the ion supply source are short-circuited by penetrating the insulating element by the protrusion. The power storage device according to claim 2,
The ion supply source includes an ion supply metal and a metal member connected thereto,
Forming a protrusion facing the insulating element on at least one of the negative electrode, the positive electrode, and the metal member;
An electrical storage device, wherein the metal member is short-circuited with at least one of the negative electrode and the positive electrode by penetrating the insulating element by the protrusion. The electricity storage device according to claim 3 or 4,
The power storage device, wherein the protruding portion is formed in a stacked region where the negative electrode and the positive electrode are stacked. The electricity storage device according to claim 3 or 4,
The power storage device, wherein the protrusion is formed in a bonding region where the plurality of negative electrodes or the plurality of positive electrodes are bonded. The electricity storage device according to claim 1, wherein
An energy storage device, wherein the energy applied to the exterior container is thermal energy. The electricity storage device according to claim 7,
The electrical storage device, wherein the insulating element is a heat shrinkable material that shrinks by heat energy. The electricity storage device according to claim 7,
An electricity storage device, wherein at least one of the negative electrode and the positive electrode and the ion supply source are connected via a heat-sensitive element that is brought into conduction by thermal energy. The electricity storage device according to claim 8,
The ion supply source includes an ion supply metal and a metal member connected to the ion supply metal, and the heat shrinkable material is disposed to face the metal member.
An electrical storage device characterized in that at least one of the negative electrode and the positive electrode and the metal member are short-circuited by contracting the heat-shrinkable material. The electricity storage device according to claim 9,
The ion supply source includes an ion supply metal and a metal member connected thereto, and the heat sensitive element is connected to the metal member,
An electrical storage device characterized by short-circuiting at least one of the negative electrode and the positive electrode and the metal member by bringing the heat-sensitive element into a conductive state. The electricity storage device according to claim 8 or 10,
The power storage device, wherein the heat shrinkable material is formed of a porous material. The electricity storage device according to claim 9 or 11,
The heat storage device, wherein the heat sensitive element is a bimetal or a thermistor.

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