JP5721726B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device that can be charged by applying a voltage between a positive electrode and a negative electrode immersed in an electrolytic solution or can be taken out based on a discharge between the positive electrode and the negative electrode.

  Conventionally, a positive electrode and a negative electrode immersed in an electrolytic solution in a container are provided, and charging can be performed by applying a voltage between the positive electrode and the negative electrode or taking out a voltage based on a discharge between the positive electrode and the negative electrode. A power storage device (battery) is known.

  For example, Patent Document 1 forms a cell container for a large number of mutually connected positive and negative electrodes whose casings are connected by the same electrolyte, and has good heat at a fixed interval between adjacent electrodes. Disclosed is a metal oxide-hydrogen battery having a casing intermediate wall made of a conductive material, the intermediate wall being electrically insulated from the electrode, but permeable to electrolyte. In Patent Document 2, an electrode body in which a positive electrode capable of occluding and releasing anions and a negative electrode capable of occluding and releasing lithium ions are opposed to each other through a separator is housed in a sealed container together with a non-aqueous electrolyte. A storage device comprising a plurality of connected storage cells connected in series, each cell having a third electrode having a lithium metal disposed in a non-aqueous electrolyte, and a potential difference between the third electrode and the positive electrode is predetermined. When the value is exceeded A power storage device is disclosed in which the potential of the positive electrode is controlled with respect to the third electrode by electrically connecting the three electrodes and the positive electrode. Further, Patent Document 3 discloses a power storage device including an electrode material and an electrolyte. A power storage device is disclosed that includes a fibrous carbon catalyst in which an electrode material includes carbon particles having a nanoshell structure. Further, Patent Document 4 discloses an electrolyte solution obtained by dissolving an electrolyte panadium salt in pure water. An oxidation-reduction type power storage device is disclosed, in which a device for generating electromagnetic waves in the far-infrared region is provided in an electrolytic solution circulation piping system.

JP-A-6-215805 JP 2007-305475 A JP 2009-208061 A JP 2009-283425 A

  However, all the conventional power storage devices including the power storage devices disclosed in the above-mentioned documents have the following common problems.

  First, all power storage devices are made of various materials including rare metals, etc., and the total number of parts tends to increase, and the electrodes immersed in the electrolyte solution are familiar materials, that is, inexpensive. It is hard to say that they are using materials that are readily available. For this reason, there has been a limit in reducing the cost of the product due to an increase in the overall cost including the material (parts) cost and the manufacturing (assembly) cost. In addition, there is room for further improvement in terms of cost and supply, for example, the materials are limited in terms of resources.

  Second, even in the electrolyte solution used, it is difficult to say that familiar materials are used, and in most cases, harmful chemical substances are used. Therefore, if a liquid leak occurs due to damage, etc., highly hazardous chemical substances will leak to the outside, which is not desirable from the viewpoint of environmental protection and safety, and when it cannot be used due to its life, etc., it will be discarded. Handling when processing and recycling is difficult.

  An object of the present invention is to provide a power storage device that solves such problems in the background art.

  In order to solve the above-described problems, the present invention includes a positive electrode 2 and a negative electrode 3 that are immersed in an electrolytic solution in a container, and is charged by applying a voltage between the positive electrode 2 and the negative electrode 3 or the positive electrode 2. When the power storage device 1 capable of taking out a voltage based on the discharge between the negative electrode 3 and the negative electrode 3 is configured, at least one of the positive electrode block 2x and the negative electrode block 3x formed of the conductive porous material Rc is hermetically sealed. It is used as the positive electrode 2 and the negative electrode 3 by immersing in the electrolytic solution Le accommodated in the container 4, and at least of the positive electrode block 2x and the negative electrode block 3x between the positive electrode 2 and the negative electrode 3 in the electrolytic solution Le. A partition wall 5 for preventing the diffusion of the gas component leaking from one surface to the outside is disposed, and the internal pressure Pi of the hermetic container 4 is set to the internal component of at least one of the positive electrode block 2x and the negative electrode block 3x. And characterized by being set equal to or larger than a predetermined size to hold.

  In this case, according to a preferred aspect of the invention, an aqueous solution using a food component or an aqueous solution using a hot spring component can be used as the electrolytic solution. The positive electrode block and the negative electrode block can be attached with electrode terminals formed of graphite and protruding so that the tip is exposed to the outside of the electrolytic solution.

  According to the power storage device 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) Since at least one of the positive electrode block and the negative electrode block is formed of a conductive porous material, the porous material is carbonized, for example, wood, which is a familiar and easily available material. Charcoal materials can be used. Therefore, it is possible to use wood scraps and waste materials, and it is possible to reduce the cost of products by reducing costs, and it is advantageous in terms of resources, unlike rare metals, etc. It is most suitable for power storage facilities in solar power generation (solar panel) systems.

  (2) Since a partition wall that prevents diffusion of gas components leaking outside from at least one surface of the positive electrode block and the negative electrode block is disposed between the positive electrode and the negative electrode in the electrolyte solution, the gas component is electrolyzed. Even when released into the liquid, by securing the gas component on the electrode side, unnecessary chemical reaction between the gas components can be prevented and the charging capacity can be enhanced.

  (3) According to a preferred embodiment, if an aqueous solution using a food component or an aqueous solution using a hot spring component is used as an electrolyte, a familiar food material such as a saline solution or a bath agent can be used. In addition to being able to flow freely into sewage, etc., it is also harmless to the human body including the skin. Therefore, environmental protection and safety can be ensured even when liquid leakage occurs due to damage, etc., and handling when performing disposal processing and recycling processing even when it becomes unusable due to its lifetime etc. Becomes easy.

  (4) According to a preferred embodiment, if an electrode terminal is attached to the electrode block that is made of graphite and protrudes, the tip of the electrode block is exposed to the outside of the electrolytic solution, so that the metal part is immersed in the electrolytic solution. Absent. Therefore, it is possible to eliminate a loss or an adverse effect due to an unnecessary chemical reaction in the electrolytic solution.

Sectional front view of a power storage device according to a preferred embodiment of the present invention, A plan view of a positive electrode block and a negative electrode block in the power storage device, External plan view of the power storage device, An exploded perspective view of the main part of the power storage device, A flowchart for explaining a method of manufacturing the same power storage device, Operation explanatory diagram of the power storage device, A plan view showing a modification example of one electrode block of the power storage device, Sectional front view including a partially extracted enlarged view showing a modification of the partition wall of the power storage device, The typical block diagram of the electrical storage apparatus which concerns on 1st modified embodiment (a) and 2nd modified embodiment (b) of this invention,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the structure of the electrical storage apparatus 1 which concerns on this embodiment is demonstrated concretely with reference to FIGS.

  The power storage device 1 includes a sealed container 4, a positive electrode block 2x, a negative electrode block 3x, a partition wall 5, and an electrolytic solution Le as main components.

  The sealed container 4 is constituted by a combination of a container body 4m (see FIG. 4) and a container cover 4c formed of, for example, a transparent (semi-transparent) plastic material. The illustrated container body 4m is formed as a circular container and has a body flange 4mf integrally formed at the upper end. Moreover, it has the cover flange 4cf integrally formed also in the outer peripheral part of the container cover 4c, and the main body flange 4mf and the cover flange 4cf can be fixed with multiple sets (eight examples are illustrated) of screws and nuts 10. When fixing, a seal ring 11 such as an O-ring is interposed between the main body flange 4mf and the container cover 4c to ensure sufficient sealing performance. On the other hand, the container cover 4 c is provided with a pair of connection terminal portions 2 j and 3 j and a liquid injection port portion 12 for injecting the electrolytic solution Le into the sealed container 4. The liquid injection port 12 incorporates a check valve.

  The negative electrode block 3x is formed of a porous material Rc having conductivity. As the porous material Rc, it is desirable to use a carbon material Bc obtained by carbonizing wood. The negative electrode block 3x is formed in a cylindrical shape as shown in FIG. As shown in FIG. 2 and FIG. 2, the negative electrode block 3x may be integrally formed from a single piece of wood, or, as shown in FIG. 7, six pieces divided into six at regular intervals in the circumferential direction. The divided blocks Mp... May be manufactured, the divided blocks Mp... May be arranged in a cylindrical shape, and the outer peripheral surface may be fixed by a non-metallic fastening band 32. When the divided blocks Mp... Are used, a smaller piece of wood can be used, so that there is an advantage that further effective utilization of waste materials and scrap materials can be achieved. In addition, although the case where it divided into 6 was shown, such a division | segmentation number can be implemented by arbitrary numbers.

  Moreover, the attachment hole 13 for inserting and attaching the electrode terminal 3xp is provided in the axial direction in one end surface of the negative electrode block 3x. The electrode terminal 3xp is formed into a round bar shape from graphite C, and is integrated with the negative electrode block 3x by being inserted into the mounting hole 13. At this time, it is considered that the electrical resistance at the time of connection between the electrode terminal 3xp and the negative electrode block 3x is as small as possible and the mechanical coupling strength is as large as possible. Further, the electrode terminal 3xp protrudes from the end face of the negative electrode block 3x by a predetermined length, and this protrusion length is considered so that the tip 3xps of the electrode terminal 3xp is exposed to the outside of the electrolyte Le. The tip 3xps side of the electrode terminal 3xp can be connected (coupled) to the inner end side of the connection terminal portion 3j.

  Similarly to the negative electrode block 3x, the positive electrode block 2x is also formed using a conductive porous material Rc, that is, a carbon material Bc obtained by carbonizing wood. The positive electrode block 2x is formed in a cylindrical shape (see FIG. 4) that can be accommodated in the inner space of the negative electrode block 3x, and an attachment hole 14 for inserting and attaching the electrode terminal 2xp is provided at the center position of one end face. Provide in the axial direction. Similarly to the material for forming the positive electrode block 2x, the electrode terminal 2xp is formed into a round bar shape from graphite C, and is integrated into the positive electrode block 2x by being inserted into the mounting hole 14. At this time, similarly to the negative electrode block 3x, the electrical resistance at the time of connection between the electrode terminal 2xp and the positive electrode block 2x is made as small as possible and the mechanical coupling strength is made as large as possible. The electrode terminal 2xp protrudes from the end face of the positive electrode block 2x by a predetermined length, and this protrusion length is considered so that the tip 2xps of the electrode terminal 2xp is exposed to the outside of the electrolyte Le. The tip 2xps side of the electrode terminal 2xp can be connected (coupled) to the inner end side of the connection terminal portion 2j described above. The positive electrode block 2x may also be configured by a combination of a plurality of divided blocks in the same manner as the negative electrode block 3x shown in FIG.

  Thus, when forming the positive electrode block 2x and the negative electrode block 3x, one of the positive electrode block 2x and the negative electrode block 3x is formed into a cylindrical shape, and the other is formed into a cylindrical shape that can be accommodated in one internal space. If formed, a sufficient volume in the positive electrode block 2x and the negative electrode block 3x and a sufficient area in the opposing surfaces 2xf and 3xf of the positive electrode block 2x and the negative electrode block 3x can be secured. Loss can be reduced by reducing the electrical resistance between the negative electrode blocks 3x. Further, if the electrode terminals 2xp and 3xp, which are formed of graphite C and protruded from the positive electrode block 2x and the negative electrode block 3x and the tips 2xps and 3xps are exposed to the outside of the electrolytic solution Le, are combined, the metal portion is formed. Since the problem of being immersed in the electrolytic solution Le does not occur, it is possible to eliminate a loss or an adverse effect based on an unnecessary chemical reaction in the electrolytic solution Le.

On the other hand, the volume relationship between the negative electrode block 3x and the positive electrode block 2x is set as follows. First, in the negative electrode block 3x, if the inner radius is ri, the outer radius is re, and the height is h, the volume Vm is expressed by the following equation.
Vm = π × (rm ² −ri ² ) × h

Further, in the positive electrode block 2x, if the radius is rs and the height is h, the volume Vs is expressed by the following equation.
Vs = π × rs × h

Since the porous material Rc forming the negative electrode block 3x and the positive electrode block 2x has a function of confining a gas component generated during charging, the volume of the negative electrode block 3x and the positive electrode block 2x is determined by the respective electrode blocks 2x and 3x. It is necessary to make it proportional to the amount of gas generated. For example, when saline (NaCl) is used as the electrolytic solution Le, hydrogen gas (H ₂ ) is generated in the negative electrode block 3x, and chlorine gas (Cl ₂ ) is generated in the positive electrode block 2x. Since the ratio is 1: 1, the volume ratio between the negative electrode block 3x and the positive electrode block 2x is also set to Vm: Vs = 1: 1. On the other hand, when dilute sulfuric acid (H ₂ SO ₄ ) is used as the electrolytic solution Le, hydrogen gas is generated in the negative electrode block 3x and oxygen gas is generated in the positive electrode block 2x, and the ratio thereof is 2: In this case, the volume ratio between the negative electrode block 3x and the positive electrode block 2x may be set to Vm: Vs = 2: 1.

  On the other hand, the partition wall 5 is formed in a cylindrical shape with a plastic material or the like, and its upper end is fixed to a mounting groove provided on the inner surface of the container cover 4c. The partition wall 5 is disposed at the center position of the gap between the positive electrode block 2x and the negative electrode block 3x. The partition wall 5 has a function of preventing diffusion of gas components that are generated in the positive electrode block 2x and the negative electrode block 3x and leak to the outside from the surfaces of the positive electrode block 2x and the negative electrode block 3x. In addition, although it seems that there is almost no gas component which leaks outside from the surface of the positive electrode block 2x and the negative electrode block 3x, if such a partition wall 5 is arrange | positioned, a gas component should be in electrolyte solution Le by any chance. Even when the gas is released into the battery, gas components are secured on the respective electrode sides of the positive electrode block 2x and the negative electrode block 3x by the partition wall 5, thereby preventing unnecessary chemical reaction and charging efficiency (charging). Ability).

  However, the provision of the partition wall 5 impairs the conductivity between the positive electrode block 2x and the negative electrode block 3x. Therefore, as shown in FIG. 1, the lower end of the partition wall 5 is negative with the positive electrode block 2x. The axial length of the electrode block 3x is selected so as to be positioned at an intermediate position in the axial direction (vertical direction) of the electrode block 3x. Thereby, only the partial surfaces (upper half) of the opposing surfaces 2xf and 3xf in the positive electrode block 2x and the negative electrode block 3x are partitioned, so that conductivity is ensured by the space between the remaining surfaces (lower half). Is done. On the other hand, as shown in FIG. 8, the partition wall 5 may have a shape that partitions the entire surfaces 2xf and 3xf facing each other. In this case, a large number of small holes 5ha... 5hb... May be provided in the partition wall 5 as in the enlarged extraction cross section shown in FIG. In addition, (a) shows the example which provided the straight small hole 5ha ... which becomes a right angle with respect to the surface of the partition wall 5, (b) forms the hole inclined from both surfaces of the partition wall 5, and communicates in the center. An example in which the V-shaped small holes 5 hb. In the case of (b), the gas component can be made more difficult to pass. As described above, the partition wall 5 can be implemented in various forms. In particular, an optimum form can be selected from the viewpoint of achieving both prevention of diffusion of gas components and ensuring of conductivity. In addition, it is desirable to attach a nonwoven fabric to the outer peripheral surface of the positive electrode block 2x and to interpose the nonwoven fabric between the opposing surfaces 2xf and 3xf in the positive electrode block 2x and the negative electrode block 3x.

Moreover, various electrolyte solutions can be used for the electrolyte solution Le. For example, as the neutral aqueous solution, a saline solution, a calcium chloride (CaCl ₂ ) aqueous solution, a sodium sulfate (Na ₂ SO ₄ ) aqueous solution, or the like can be used. As the alkaline aqueous solution, a sodium hydroxide (NaOH) aqueous solution, a potassium hydroxide (KOH) aqueous solution, a calcium hydroxide (Ca (OH) ₂ ) aqueous solution, or the like can be used. As the acidic aqueous solution, a hydrochloric acid (HCl) aqueous solution, a dilute sulfuric acid aqueous solution, or the like can be used. Furthermore, as the weak alkaline aqueous solution and the weak acidic aqueous solution, a sodium bicarbonate (NaHCO ₃ ) aqueous solution, an acetic acid (CH ₃ COOH) aqueous solution, or the like can be used.

In particular, as the electrolytic solution Le, it is desirable to use an aqueous solution using food ingredients, that is, in the above-described example, a saline solution, an aqueous sodium bicarbonate solution, an aqueous acetic acid solution, or the like. In addition, an aqueous solution using a hot spring component (including a bath agent component), that is, the above-described sodium sulfate aqueous solution, calcium sulfate (CaSO ₄ ) aqueous solution, potassium sulfate (K ₂ SO ₄ ) aqueous solution, magnesium sulfate (MgSO ₄ ). An aqueous solution or the like is also suitable. As described above, if an aqueous solution using a food ingredient or an aqueous solution using a bath ingredient (hot spring ingredient) is used as the electrolyte solution Le, familiar food materials such as salt water or a bath additive etc. that are not harmful can be used. In addition to being able to flow freely into sewage, etc., it is also harmless to the human body including the skin. Therefore, environmental protection and safety can be ensured even when liquid leakage occurs due to damage, etc., and handling when performing disposal processing and recycling processing even when it becomes unusable due to its lifetime etc. There is an advantage that becomes easy.

  Next, a method for manufacturing the power storage device 1 according to the present embodiment will be described according to the flowchart shown in FIG. 5 with reference to FIGS.

  The power storage device 1 illustrated uses a carbonaceous material Bc obtained by carbonizing wood for the positive electrode block 2x and the negative electrode block 3x, and salt water is used for the electrolyte Le.

  First, various parts, that is, parts such as the container main body 4m, the container cover 4c, the connection terminal portions 2j and 3j, and the partition wall 5 are manufactured and prepared in advance (step S1). Moreover, the salt solution used as electrolyte solution Le is prepared and prepared (step S2). The concentration of the saline is preferably about 10 to 30 [%]. Further, a cylindrical wooden block serving as a base material for the negative electrode block 3x and a cylindrical wooden block serving as a base material for the positive electrode block 2x shown in FIG. 4 are obtained by cutting wood (for example, chestnut tree). Is manufactured (step S3).

  On the other hand, each manufactured cylindrical block is put into a charcoal pot (not shown) and subjected to charcoal processing (carbonization processing) by burning (step S4). Thereby, the carbonaceous material Bc which carbonized wood, ie, the positive electrode block 2x and the negative electrode block 3x, can be obtained. As shown in FIGS. 1 and 4, the electrode terminal 2xp is inserted into the mounting hole 14 of the positive electrode block 2x and attached, and the electrode terminal 3xp is inserted into the mounting hole 13 of the negative electrode block 3x (step S5). .

  Next, parts are assembled (step S6). As shown in FIG. 1, the assembly is mainly performed on the container cover 4c. First, the upper end of the partition wall 5 formed in a cylindrical shape is fixed to the lower surface (inner surface) of the container cover 4c. Thereby, the partition wall 5 protrudes downward from the lower surface of the container cover 4c. Further, the connection terminal portions 2j and 3j are attached to the container cover 4c. In this case, the connection terminal portions 2j and 3j protrude upward from the upper surface (outer surface) of the container cover 4c, and external wiring cables 21p and 21n (see FIG. 6) can be connected to the connection terminal portions 2j and 3j. it can. Furthermore, the connection terminal portion 2j facing the lower surface (inner surface) side of the container cover 4c is inserted and fixed to the electrode terminal 2xp attached to the positive electrode block 2x from the tip 2xps, and the lower surface (inner surface) side of the container cover 4c. An electrode terminal 3xp attached to the negative electrode block 3x is inserted and fixed from the tip 3xps to the connection terminal portion 3j facing the surface. Moreover, the liquid inlet part 12 incorporating the check valve is attached to the container cover 4c at the position shown in FIG.

  When the assembly of the parts is completed, the negative electrode block 3x and the positive electrode block 2x assembled to the container cover 4c are accommodated in the container main body 4m, and the container cover 4c is attached to the container main body 4m. . At this time, as shown in FIG. 1, a seal ring 11 such as an O-ring is interposed between the container body 4m and the container cover 4c. Further, the main body flange 4mf of the container main body 4m and the cover flange 4cf of the container cover 4c are overlapped, and are fastened and fixed by screws and nuts 10 (step S7).

  Next, a saline solution (electrolytic solution Le) is injected into the sealed container 4 from the liquid injection port 12 (step S8). In this case, the saline solution stored in an electrolyte solution storage tank (not shown) is sent by a pressure pump and injected through a supply pipe connected to the liquid injection port portion 12. As the saline solution is injected into the sealed container 4, the internal pressure Pi of the sealed container 4 gradually increases. Therefore, when the salt solution reaches a specified amount (almost full), the internal pressure Pi is a predetermined magnitude. As described above, preferably, it is confirmed that the pressure has reached 1 [MPa] or more, and the injection of the saline solution is terminated (step S9). At this time, the reverse flow (leakage) of the saline is prevented by the check valve built in the liquid injection port 12. Thereafter, the power storage device 1 is completed through a necessary finishing process (step S10) and an inspection process (step S11) (step S12).

  As described above, according to the power storage device 1 according to the present embodiment, the positive electrode block 2x and the negative electrode block 3x formed of the conductive porous material Rc are made of materials that are readily available at low cost. A carbon material Bc obtained by carbonizing a certain wood can be used. Therefore, it is possible to use wood scraps and waste materials, and it is possible to reduce the cost of products by reducing costs, and it is advantageous in terms of resources, unlike rare metals, etc. It is most suitable for power storage equipment in solar power generation (solar panel) systems.

  Next, the operation (usage method) of the power storage device 1 according to the present embodiment will be described with reference to FIG.

FIG. 6 is a principle diagram showing a chemical reaction during charging (during storage). First, at the time of charging, as shown in the figure, the positive electrode side of the charger 21 (DC5 [V] for illustration) is connected to the positive electrode terminal 2xp, and the negative electrode of the charger 21 is connected to the negative electrode terminal 3xp. Connect the sides. Thereby, a current flows from the positive electrode block 2x to the negative electrode block 3x. At this time, the saline solution (electrolytic solution Le) is electrolyzed, chlorine gas (Cl ₂ ) is generated in the positive electrode block 2x, and hydrogen gas (H ₂ ) is generated in the negative electrode block 3x. Further, since the internal pressure Pi of the sealed container 4 acts on the positive electrode block 2x and the negative electrode block 3x, the generated chlorine gas is held inside the positive electrode block 2x, and the generated hydrogen gas is It is held inside the negative electrode block 3x. That is, chlorine gas and hydrogen gas are confined as they are in the fibrous space of the carbonaceous material Bc as the porous material Rc.

In this case, even if a gas component (Cl ₂ , H ₂ ) is released into the electrolyte Le from the positive electrode block 2x and the negative electrode block 3x, the partition wall 5 prevents diffusion of the gas component. Since the positive electrode block 2x and the negative electrode block 3x are secured (held) on the respective electrode sides, unnecessary chemical reaction can be prevented and charging efficiency (charging ability) can be improved. The generation of chlorine gas and hydrogen gas generates sodium hydroxide (NaOH) in the positive electrode block 2x. This sodium hydroxide (NaOH) is also held inside the positive electrode block 2x. The above is the chemical action during charging.

  On the other hand, at the time of discharging, a predetermined voltage (for example, about DC2 [V]) can be taken out between the positive electrode terminal 2xp and the negative electrode terminal 3xp. That is, the discharge between the positive electrode block 2x and the negative electrode block 3x causes hydrogen gas to decrease and generate electrons on the negative electrode block 3x side, and on the positive electrode block 2x side, salt is generated by chlorine gas and sodium hydroxide. Water is regenerated, which reduces chlorine gas and absorbs electrons. Thereby, a current flows from the negative electrode block 3x to the positive electrode block 2x. The above is the chemical action during discharge.

  Next, the power storage device 1 according to the modified embodiment of the present invention will be described with reference to FIGS. 9 (a) and 9 (b). 9A and 9B, the same reference numerals are given to the same parts (same function parts) as those in FIGS. 1 to 4 to clarify the configuration.

  First, the power storage device 1 according to the first modified embodiment shown in FIG. 9A shows an example in which the number of electrode blocks is changed. The power storage device 1 according to the basic embodiment shown in FIGS. 1 to 4 uses two electrode blocks, a positive electrode block 2x and a negative electrode block 3x, but the power storage device 1 shown in FIG. A positive electrode block 41 to which an electrode terminal 41p is further attached is added to the outside of the negative electrode block 3x, and is constituted by three electrode blocks. Similarly, the negative electrode block and the positive electrode block may be alternately arranged outside the positive electrode block 41, and any number of electrode blocks can be implemented.

  Moreover, the electrical storage apparatus 1 which concerns on 2nd modified embodiment shown in FIG.9 (b) shows the example which changed the shape of the electrode block. In the power storage device 1 according to the basic embodiment shown in FIGS. 1 to 4, the positive electrode block 2x is formed in a cylindrical shape and the negative electrode block 3x is formed in a cylindrical shape, but as shown in FIG. 9B. The positive electrode block 2x and the negative electrode block 3x may each be formed in a rectangular parallelepiped shape. Thus, the electrode block can be implemented in any shape.

  The preferred embodiment (modified embodiment) has been described in detail above, but the present invention is not limited to such an embodiment, and the present invention is not limited to such a configuration, shape, material, quantity, numerical value, and the like. Any change, addition, or deletion can be made without departing from the scope of the above.

  For example, although the case where the carbonaceous material Bc which carbonized wood was used as the porous material Rc which has electroconductivity was shown, other various raw materials can be applied if it is the porous material Rc which has electroconductivity. Moreover, although the example which formed the positive electrode block 2x in the column shape and formed the negative electrode block 3x in the column shape which can be accommodated in the said cylindrical internal space was shown, the negative electrode block 3x was formed in the column shape, You may form the positive electrode block 2x in the column shape which can be accommodated in the said cylindrical internal space. Furthermore, although the electrode terminals 2xp and 3xp have been shown as being formed of graphite C, it does not exclude the case where they are formed of other materials. However, in this case, a metal material is not desirable.

  The power storage device according to the present invention can be basically used as a power storage device in various applications that require power storage, including power storage equipment in a photovoltaic power generation (solar panel) system of a general house.

  1: power storage device, 2: positive electrode, 2x: positive electrode block, 2xf: opposite surface, 2xp: electrode terminal, 2xps: tip of electrode terminal, 3: negative electrode, 3x: negative electrode block, 3xf: opposite 3xp: electrode terminal, 3xps: tip of electrode terminal, 4: closed container, 5: partition wall, Le: electrolyte, Rc: porous material, Pi: internal pressure, Bc: carbon material, C: graphite

Claims (3)

  A positive electrode and a negative electrode immersed in an electrolytic solution in a container are provided, and charging is performed by applying a voltage between the positive electrode and the negative electrode, or a voltage is taken out based on a discharge between the positive electrode and the negative electrode. The positive electrode block and the negative electrode block, at least one of which is made of a conductive porous material, are used as the positive electrode and the negative electrode by immersing them in the electrolyte contained in a sealed container. And, between the positive electrode and the negative electrode in the electrolyte, a partition wall that prevents diffusion of gas components leaking outside from at least one surface of the positive electrode block and the negative electrode block is disposed, In addition, the internal pressure of the sealed container is set to a predetermined size or more that can hold the gas component in at least one of the positive electrode block and the negative electrode block. Power storage device to be.   The power storage device according to claim 1, wherein an aqueous solution using a food component or an aqueous solution using a hot spring component is used as the electrolytic solution.   3. The positive electrode block and the negative electrode block are formed of graphite, and are attached with electrode terminals whose tips are exposed to the outside of the electrolyte by protruding. Power storage device.

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