JP7049603B2 - A power storage element, a power storage device including a power storage element, a mobile body including a power storage element, and a power storage system including a power storage element. - Google Patents

Description

Cross-reference of related applications

The present application claims the priority of Japanese Patent Application No. 2016-102569, and the content of Japanese Patent Application No. 2016-102569 is incorporated herein by reference.

The present invention relates to a power storage element including a plurality of winding type electrodes, a power storage device including the power storage element, a mobile body including the power storage element, and a power storage system including the power storage element.

Conventionally, a secondary battery including a plurality of electrode assemblies has been known (see Patent Document 1). As shown in FIG. 18, the secondary battery includes a plurality of electrode assemblies 101, a first current collector plate 102, a case 103, and a cap assembly 104.

Each of the plurality of electrode assemblies 101 is formed by laminating and winding a first electrode plate, a separator, and a second electrode plate formed in a thin plate type or a film type. These plurality of electrode assemblies 101 are arranged in parallel in one direction in the case 103. At this time, a gap is formed between the adjacent electrode assemblies 101.

A first current collector plate 102 for being electrically connected to the first electrode plate is coupled to one side end of the plurality of electrode assemblies 101 arranged in one direction. Further, the case 103 having polarity because it is electrically connected to the second electrode plate comes into contact with the other side ends of the plurality of electrode assemblies 101. At this time, the first current collector plate 102 and one side end portion (the first electrode plate) of the electrode assembly 101 are connected by welding. Further, the case 103 and the other end portion of the electrode assembly 101 (the second electrode plate) are also joined by welding.

The case 103 includes a bottom 105 and a side wall 106 extending from the bottom 105 so that the electrolyte, the plurality of electrode assemblies 101, and the first current collector plate 102 are housed. The case 103 is made of a conductive metal and acts as an electrode having one polarity. That is, the case 103 is electrically connected to the other side end portions (the second electrode plate) of the plurality of electrode assemblies 101 and serves as a second current collector plate.

The cap assembly 104 includes a cap plate 107 that seals the case 103, a first electrode terminal 108 that penetrates the cap plate 107 and is connected to the first current collector plate 102, and a screw formed on the first electrode terminal 108. Includes a first nut 109, which is fastened along the ridge and secures the first electrode terminal 108 to the cap plate 107.

In the above secondary battery 100, the case 103 is arranged so that the winding center axis of each electrode assembly 101 is horizontal. More specifically, the electrode assembly at one end (for example, the left end in FIG. 18) is arranged. When the case 103 is arranged so that the 101 is located above the electrode assembly 101 at the other end (for example, the right end in FIG. 18), only a part of the electrode assembly 101 is an electrolytic solution accumulated in the case 103. Do not come into contact with excess electrolyte). Therefore, in the secondary battery 100, if charging and discharging are repeated in the above-mentioned posture, the electrode assembly 101 that is not in contact with the surplus electrolytic solution among the plurality of electrode assemblies 101 causes a shortage of the electrolytic solution. As described above, when the electrolytic solution is insufficient in a part of the plurality of electrode assemblies 101, the output of the entire secondary battery 100 is reduced.

Japanese Patent Application Laid-Open No. 2011-77026

Therefore, the present embodiment includes a plurality of winding type electrode bodies and a case in which a plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding center axes are parallel to each other, and the winding center of each electrode body. A power storage element for supplying an electrolytic solution to the upper electrode body when the case is arranged so that the axis is horizontal and the electrode body at one end is located above the electrode body at the other end, and the power storage element including the power storage element. It is an object of the present invention to provide an apparatus, a mobile body including the power storage element, and a power storage system including the power storage element.

The power storage element of this embodiment is
Multiple electrode bodies around which the electrodes are wound, and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution, and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
The plurality of electrode bodies are arranged in the protruding direction of the external terminal with the winding central axes parallel to each other.
Adjacent electrode bodies have liquid entanglements with each other on the outer peripheral surfaces of the electrode bodies.

FIG. 1 is a perspective view of a power storage element according to the first embodiment. FIG. 2 is an exploded perspective view of the power storage element. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is a diagram for explaining an electrode body. FIG. 5 is a diagram for explaining the amount of excess electrolytic solution in the power storage element. FIG. 6 is an exploded perspective view of the power storage element according to the second embodiment. FIG. 7 is a perspective view in which a part of the power storage device according to the third embodiment is omitted. FIG. 8 is an exploded perspective view in which a part of the power storage device is omitted. FIG. 9 is an exploded perspective view of the power storage element included in the power storage device. FIG. 10 is a cross-sectional view of the power storage element. FIG. 11 is a diagram for explaining an electrode body included in the power storage element. FIG. 12 is a schematic diagram for explaining a moving body. FIG. 13 is a schematic diagram for explaining the power storage system. FIG. 14 is a diagram for explaining the arrangement of a plurality of electrode bodies in the power storage element of another embodiment. FIG. 15 is a diagram for explaining the arrangement of a plurality of electrode bodies in the power storage element of another embodiment. FIG. 16 is a schematic cross-sectional view for explaining the outer region of the electrode body. FIG. 17 is a perspective view of a power storage device including a power storage element according to the first or second embodiment. FIG. 18 is a cross-sectional view of a conventional secondary battery.

The power storage element of this embodiment is
Multiple electrode bodies with wound electrodes and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution, and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
The plurality of electrode bodies are arranged in the protruding direction of the external terminal with the winding central axes parallel to each other.
Adjacent electrode bodies have liquid entanglements with each other on the outer peripheral surfaces of the electrode bodies.

According to this configuration, the adjacent electrode bodies entangle the outer peripheral surfaces with each other so that the winding center axis of each electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. Even if the case is arranged in this way, the electrolytic solution is supplied from the lower electrode body to the upper electrode body. As a result, the electrolytic solution accumulated in the case (hereinafter, also referred to as “surplus electrolytic solution”) can be supplied from the lower electrode body to the upper electrode body.

Further, the power storage element of this embodiment is
Multiple electrode bodies with wound electrodes and
With the electrolyte
A case is provided in which the plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding central axes are parallel to each other.
As for the amount of the electrolytic solution accumulated in the case, the case is arranged so that the winding center axis of the housed electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. At that time, the liquid level is set to be lower than the lower end of the electrode body located at the top in the case.
Adjacent electrode bodies have liquid entanglements with each other on the outer peripheral surfaces of the electrode bodies.

According to this configuration, the adjacent electrode bodies entangle the outer peripheral surfaces with each other, so that the winding center axis of each electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. Even if the electrode body is located above the liquid level of the excess electrolytic solution (electrolyte solution accumulated in the case) in the case when the case is arranged as described above, the electrolytic solution is discharged from the lower electrode body. Since it is supplied to the upper electrode body, the surplus electrolytic solution is supplied to the electrode body located above the liquid surface.

In the power storage element,
The adjacent electrode bodies may always be liquid-entangled with the outer peripheral surface in the charge / discharge process.

According to this configuration, even if the cross section orthogonal to the winding center axis of the electrode body expands and contracts due to charging and discharging, the outer peripheral surfaces of the adjacent electrode bodies are always liquid-entangled with each other, so that the winding of each electrode body is performed. Even if the case is arranged so that the central axis is horizontal, the surplus electrolytic solution is always supplied from the lower electrode body to the upper electrode body.

In the power storage element,
The adjacent electrode bodies may be liquid-entangled by bringing the outer peripheral surfaces into contact with each other.

In this way, since the outer peripheral surfaces of the adjacent electrode bodies are in contact with each other, even if the case is arranged so that the winding center axis of each electrode body is horizontal, the electrolyte solution is on the lower electrode body. Is supplied to the upper electrode body from.

In the power storage element,
Each of the plurality of electrode bodies has a separator having an insulating property, and has a separator.
The electrode and the separator in each of the plurality of electrode bodies are wound in a laminated state.
The outer peripheral surface of the electrode body may be formed of the separator.

According to such a configuration, since the outer peripheral surface of each of the plurality of electrode bodies is composed of a separator having an insulating property, insulation between the electrode bodies can be surely achieved. Further, in the electrode body in which the electrode and the separator are wound in a laminated state, the electrolytic solution moves in the winding direction (circumferential direction) at the electrode, and also in the thickness direction and the winding direction (circumferential direction) in the separator. Since it moves in the circumferential direction), the electrolytic solution supplied to the outer peripheral surface of the electrode body is efficiently supplied (moved) to the winding center of the electrode body. Moreover, since the compressibility and resilience of the separator are better than those of the electrode, the separator can absorb the expansion and contraction of the electrode in the electrode body, so that the electrodes are adjacent to each other when the electrode contracts and expands due to charging and discharging. Separation between the electrode bodies is suppressed.

In the power storage element,
Each of the plurality of electrode bodies has an outer region including the outer peripheral surface and around which only the separator is wound.
The number of turns of the separator in the outer region of one of the adjacent electrode bodies may be larger than the number of turns of the separator in the outer region of the other electrode body of the adjacent electrode bodies.

According to such a configuration, when the case is arranged so that the winding central axis of each electrode body is horizontal and the one electrode body is above the other electrode body, the lower electrode body ( Since more electrolytic solution than the outer region of the other electrode body) is held in the outer region of the upper electrode body (one electrode body), when the power storage element is continuously used in this posture, It is possible to prevent a shortage of the electrolytic solution in the upper electrode body, which is harder to supply the surplus electrolytic solution than the lower electrode body.

In the power storage element,
The plurality of electrode bodies are arranged in a direction orthogonal to the winding center axis, and are arranged.
The number of turns of the separator in the outer region may be larger as the electrode body is on one side in the orthogonal direction.

According to such a configuration, when the case is arranged so that the winding center axis of each electrode body is horizontal and one side in the orthogonal direction is the upper side, the upper side (one side in the orthogonal direction) is arranged. Since a larger amount of electrolytic solution is held in the outer region as the electrode body is concerned, when the power storage element is continuously used in this posture, a surplus is obtained as compared with the electrode body on the lower side (the other side in the orthogonal direction). It is possible to more preferably prevent the shortage of the electrolytic solution in the upper electrode body from which the electrolytic solution is difficult to be supplied.

In the power storage element,
It is provided with at least one liquid-related member that is in contact with the outer peripheral surfaces of the adjacent electrode bodies and that sucks up the electrolytic solution.
The adjacent electrode bodies may be liquid-entangled with each other's outer peripheral surfaces by the liquid-related member.

According to this configuration, since the liquid-related member sucks up the electrolytic solution, even if the case is arranged so that the winding center axis of each electrode body is horizontal, the electrolytic solution passes through the liquid-related member from the lower electrode body. It is supplied to the upper electrode body.

In the power storage element,
The liquid-related member may be formed of a porous member having open cells.

According to this configuration, the liquid-related member can suck up the electrolytic solution more effectively, so that when the case is arranged so that the winding center axis of each electrode body is horizontal, the lower electrode body is used. The electrolytic solution is effectively supplied from the upper electrode body.

In the power storage element,
The liquid-related member may be contracted or expanded in the direction in which the adjacent electrode bodies are lined up with the expansion or contraction of the electrode bodies due to charging or discharging.

Since the liquid-related member expands and contracts according to the fluctuation of the distance between the outer peripheral surfaces of the electrode body due to the charging and discharging of the power storage element, the case is arranged so that the winding center axis of each electrode body is horizontal. Even if the power storage element is charged and discharged and the electrode body expands or contracts, the outer peripheral surfaces of the adjacent electrode bodies continue to be entangled with each other by the liquid junction member, so that the electrolytic solution moves from the lower electrode body to the upper electrode body. Continue to be supplied.

In the power storage element,
Three or more of the electrode bodies are arranged,
The amount of the electrolytic solution that can be held by the liquid junction member arranged on one side of the electrode body in the direction orthogonal to the winding center axis is the liquid arranged on the other side of the electrode body in the orthogonal direction. It may be larger than the amount of the electrolytic solution that can be held by the entwining member.

According to such a configuration, the case is such that the winding central axis of each electrode body is horizontal and the liquid-related member arranged on one side thereof is above the liquid-related member arranged on the other side. Is arranged, the amount of electrolytic solution that the upper (one side) liquid junction member can hold more than the lower (the other side) liquid junction member is large. Therefore, when the power storage element is continuously used in such a posture, it is compared with the lower electrode body (the electrode body in contact with the lower liquid-related member and above the lower liquid-related member). It is possible to prevent the occurrence of a shortage of the electrolytic solution in the upper electrode body (the electrode body in contact with the upper liquid contact member and above the upper liquid contact member) in which the surplus electrolytic solution is difficult to be supplied.

In the power storage element,
In each of the plurality of electrode bodies, the electrodes are wound so that the diameters of the electrode bodies in the orthogonal directions are the major axis and the minor axis.
The plurality of electrode bodies may be arranged inside the case so that the protruding direction of the external terminal and the minor axis direction of the electrode body coincide with each other.

In an electrode body in which an electrode is wound so as to generate a minor axis and a major axis, the swelling in the minor axis direction becomes larger than the swelling in the major axis direction during charging. The swelling of the case can be suppressed.

The power storage device of this embodiment is
A plurality of power storage elements having an electrode body having the above-mentioned major axis and minor axis, and
A holding member that holds the plurality of power storage elements, and
With a bus bar connected to the external terminal,
The plurality of power storage elements are arranged in the major axis direction of the electrode body,
The holding member has a pair of terminal members arranged on both sides of the plurality of power storage elements in the arrangement direction of the power storage elements, and a connecting portion for connecting the pair of terminal members.
The bus bar connects the external terminals of different power storage elements to each other.

According to this configuration, during charging, swelling in the arrangement direction (major axis direction of the electrode body) of the power storage elements in each case of the plurality of power storage elements is suppressed, so that a pair of forces applied to the holding member (a pair in the direction in which the interval is widened). The force to spread the terminal member) is suppressed.

Moreover, the swelling of the case in the arrangement direction of the power storage elements during charging is suppressed, that is, the change in the distance between the external terminals of the power storage elements in the arrangement direction is suppressed, so that the above-mentioned at the connection portion between the bus bar and the external terminal. The generation of stress due to the change in the interval is suppressed, and this makes it possible to prevent damage to the connection portion between the bus bar and the external terminal due to expansion / contraction of the electrode body during charging / discharging.

In the power storage device,
The case of each power storage element has a case body having an opening and a lid on which the external terminal is arranged and closes the opening.
A gap may be formed between the lid and the electrode body inside the case.

According to such a configuration, the expansion of the electrode body in the minor axis direction during charging is absorbed by the gap, and the expansion of the case in the minor axis direction can be suppressed. That is, by matching the major axis direction of the electrode body with the arrangement direction of the power storage elements, the swelling of the case in the arrangement direction is suppressed and the force applied to the holding member during charging (that is, the force to expand the pair of terminal members). ) Is suppressed, and the gap between the electrode body and the case (lid) formed in the direction in which the electrode body easily expands (minor axis direction) absorbs the expansion in the minor axis direction during charging of the electrode body. By suppressing the swelling of the case in the same direction, the generation of stress due to the swelling of the case (the swelling in the minor axis direction) at the connection portion between the bus bar and the external terminal is suppressed.

The moving body of this embodiment is
With any of the above power storage elements,
The mobile body on which the power storage element is mounted and the mobile body
A drive unit that drives the mobile body body by electric power supplied from the power storage element is provided.
The power storage element is arranged so that the terminal-side portion, which is the portion of the case where the external terminal protrudes, is located above the portion of the case opposite to the terminal-side portion.

According to this configuration, in the power storage element mounted on the moving body, since the adjacent electrode bodies are entwined with each other on the outer peripheral surfaces, the electrolytic solution is supplied from the lower electrode body to the upper electrode body. As a result, the electrolytic solution accumulated in the case is supplied from the lower electrode body to the upper electrode body.

The power storage system of this embodiment is
With any of the above power storage elements,
The power storage system main body on which the power storage element is mounted and
It is provided with an input / output terminal that is connected to the external terminal of the power storage element and is capable of inputting power from the outside and outputting power to the outside.
The power storage element is arranged so that the terminal-side portion, which is the portion of the case where the external terminal protrudes, is located above the portion of the case opposite to the terminal-side portion.

According to this configuration, in the power storage element mounted on the power storage system, adjacent electrode bodies entangle the outer peripheral surfaces with each other, so that the electrolytic solution is supplied from the lower electrode body to the upper electrode body. As a result, the electrolytic solution accumulated in the case is supplied from the lower electrode body to the upper electrode body.

The power storage element of this embodiment is
Multiple electrode bodies around which the electrodes are wound, and
A case for accommodating the plurality of electrode bodies and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
In each of the plurality of electrode bodies, the electrodes are wound so that the diameters in the orthogonal directions in the electrode body are the major axis and the minor axis.
The plurality of electrode bodies are arranged inside the case in a state where the winding center axes are parallel to each other and the protruding direction of the external terminal and the minor axis direction of the electrode body coincide with each other.
The case has a case body having an opening and a lid that closes the opening and in which the external terminal is arranged.
A gap is formed between the lid and the electrode body inside the case.

According to this configuration, by arranging the electrode bodies in the case so that the major axis directions with small swelling are aligned during charging, the swelling of the case in the major axis direction of the electrode body during charging is suppressed and the electrode body expands. The gap between the electrode body and the case (lid) formed in the easy direction (minor axis direction) absorbs the expansion in the minor axis direction when the electrode body is charged, and suppresses the swelling of the case in the same direction.

The power storage device of this embodiment is
A plurality of power storage elements having an electrode body having the above-mentioned major axis and minor axis, and
A holding member that holds the plurality of power storage elements, and
With a bus bar connected to the external terminal,
The plurality of power storage elements are arranged in the major axis direction of the electrode body,
The holding member has a pair of terminal portions arranged on both sides of the plurality of power storage elements in the arrangement direction of the power storage elements, and a connecting portion for connecting the pair of terminal members.
The bus bar may connect external terminals of different power storage elements to each other.

According to this configuration, during charging, swelling in the arrangement direction (major axis direction of the electrode body) of the power storage elements in each case of the plurality of power storage elements is suppressed, so that a pair of forces applied to the holding member (a pair in the direction in which the interval is widened). The force that pushes the terminal member of) is suppressed.

Moreover, the swelling of the case in the arrangement direction of the power storage elements during charging is suppressed, that is, the change in the distance between the external terminals of the power storage elements in the arrangement direction is suppressed, so that the above-mentioned at the connection portion between the bus bar and the external terminal. The generation of stress due to the change in the interval is suppressed, and this makes it possible to prevent damage to the connection portion between the bus bar and the external terminal due to expansion and contraction of the electrode body during charging and discharging.

From the above, according to the present embodiment, a plurality of winding type electrode bodies and a case where a plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding central axes are parallel to each other are provided, and each electrode body is provided. Even if the case is arranged so that the winding central axis is horizontal, the storage element for which the electrolytic solution is supplied to the upper electrode body, the power storage device including the power storage element, the moving body including the power storage element, and the power storage It is possible to provide a power storage system including an element.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. The power storage element includes a primary battery, a secondary battery, a capacitor and the like. In this embodiment, a rechargeable secondary battery will be described as an example of the power storage element. The first embodiment of the present invention is a power storage element. The names of the constituent members (each constituent element) of the present embodiment are those in the present embodiment, and may be different from the names of the respective constituent members (each constituent element) in the background art.

The power storage element of this embodiment is a non-aqueous electrolyte secondary battery. More specifically, the power storage element is a lithium ion secondary battery that utilizes electron transfer generated by the movement of lithium ions. This type of power storage element supplies electrical energy. The power storage element may be used alone or in a plurality. Specifically, the power storage element is used alone when the required output and the required voltage are small. On the other hand, when at least one of the required output and the required voltage is large, the power storage element is used in the power storage device in combination with another power storage element. In the power storage device, the power storage element used in the power storage device supplies electric energy.

As shown in FIGS. 1 to 4, the power storage element includes a plurality of (three in this embodiment) electrode bodies 2, an electrolytic solution, and a case 3 in which the plurality of electrode bodies 2 are housed together with the electrolytic solution, and a case. An external terminal 4 projecting from the outer surface of 3 is provided. Further, the power storage element 1 also includes a current collector 5 for conducting each of the plurality of electrode bodies 2 and the external terminal 4, and an insulating material 6 and the like arranged between the plurality of electrode bodies 2 and the case 3. ..

Each of the plurality of electrode bodies 2 is a so-called winding type electrode body. Specifically, each of the plurality of electrode bodies 2 has electrodes 23 and 24 and a separator 25, and the electrodes 23 and 24 and the separator 25 are wound in a laminated state. The electrode of this embodiment has a positive electrode 23 and a negative electrode 24. More specifically, each of the plurality of electrode bodies 2 is a laminated body 22 in which the winding core 21, the positive electrode 23, and the negative electrode 24 are laminated so as to be insulated from each other, and is wound around the winding core 21. The laminated body 22 is provided (see FIGS. 3 and 4). Each outer peripheral surface of the plurality of electrode bodies 2 is composed of a separator 25. That is, the outermost layer of each of the plurality of electrode bodies 2 (wound laminated body 22) is the separator 25. Lithium ions move between the positive electrode 23 and the negative electrode 24 in each of the plurality of electrode bodies 2, so that the power storage element 1 is charged and discharged.

The winding core 21 is usually formed of an insulating material. The winding core 21 of the present embodiment has a tubular shape, and more specifically, a cylindrical shape. The winding core 21 is formed by winding a sheet having flexibility or thermoplasticity. The sheet of the present embodiment is made of synthetic resin.

The positive electrode 23 has a band-shaped metal foil 231 and a positive electrode active material layer 232 superimposed on the metal foil 231. The positive electrode active material layer 232 is superposed on the metal leaf 231 in a state where one edge portion (uncovered portion) in the width direction of the metal foil 231 is exposed. The metal foil 231 of the present embodiment is, for example, an aluminum foil.

The negative electrode 24 has a strip-shaped metal foil 241 and a negative electrode active material layer 242 superimposed on the metal foil 241. The negative electrode active material layer 242 is formed in a state where the other edge portion (uncovered portion) of the metal foil 241 in the width direction (opposite to the uncoated portion of the metal foil 231 of the positive electrode 23) is exposed. It is overlaid on 241. The metal leaf 241 of the present embodiment is, for example, a copper foil.

In the electrode body 2 of the present embodiment, the positive electrode 23 and the negative electrode 24 configured as described above are wound in a state of being insulated by the separator 25. That is, in the electrode body 2 of the present embodiment, the laminated body 22 of the positive electrode 23, the negative electrode 24, and the separator 25 is wound.

The separator 25 is an insulating member and is arranged between the positive electrode 23 and the negative electrode 24. As a result, in the electrode body 2 (specifically, the laminated body 22), the positive electrode 23 and the negative electrode 24 are insulated from each other. Further, the separator 25 holds the electrolytic solution in the case 3. As a result, when the power storage element 1 is charged and discharged, lithium ions can move between the positive electrode 23 and the negative electrode 24 that are alternately laminated with the separator 25 interposed therebetween.

The separator 25 is strip-shaped. The separator 25 is made of, for example, a porous membrane such as polyethylene, polypropylene, cellulose, or polyamide. The separator 25 of the present embodiment is formed by providing an inorganic layer containing inorganic particles such as SiO2 particles, Al2O3 particles, and boehmite (alumina hydrate) on a base material formed of a porous film. There is. The base material of the separator 25 of the present embodiment is formed of, for example, polyethylene.

The widthwise dimension of the separator 25 is larger than the width of the negative electrode active material layer 242. The separator 25 is arranged between the positive electrode 23 and the negative electrode 24 in which the positive electrode active material layer 232 and the negative electrode active material layer 242 are overlapped with each other in a state of being displaced in the width direction so as to overlap in the thickness direction (stacking direction). To. At this time, the uncoated portion of the positive electrode 23 and the uncoated portion of the negative electrode 24 do not overlap. That is, the uncoated portion of the positive electrode 23 protrudes in the width direction (direction orthogonal to the stacking direction) from the overlapping region of the positive electrode 23 and the negative electrode 24, and the uncoated portion of the negative electrode 24 is the positive electrode 23 and the negative electrode 24. It protrudes from the overlapping region in the width direction (the direction opposite to the protruding direction of the uncovered portion of the positive electrode 23). The electrode body 2 is formed by winding the positive electrode 23, the negative electrode 24, and the separator 25 (that is, the laminated body 22) laminated in such a state. Further, in each of the plurality of electrode bodies 2 of the present embodiment, the uncoated laminated portion 26 in the electrode body 2 is configured by the portion where only the uncoated portion of the positive electrode 23 or the uncoated portion of the negative electrode 24 is laminated.

The uncoated laminated portion 26 is a portion of the electrode body 2 that is electrically connected to the current collector 5. The uncoated laminated portion 26 is provided at each pole of the electrode body 2. That is, the uncoated laminated portion 26 in which only the uncoated portion of the positive electrode 23 is laminated constitutes the uncoated laminated portion of the positive electrode in the electrode body 2, and the uncoated laminated portion 26 in which only the uncoated portion of the negative electrode 24 is laminated is formed. It constitutes an uncoated laminated portion of the negative electrode in the electrode body 2.

The plurality of electrode bodies 2 configured as described above have external terminals 4 from the outer surface of the case 3 (specifically, the outer surface of the lid plate 32 described later of the case 3) in a state where the winding central axes C are parallel to each other. Are lined up in the protruding direction (vertical direction in FIG. 2). Each of the uncoated laminated portions 26 of the plurality of electrode bodies 2 is connected to the current collector 5. Specifically, the uncoated laminated portion 26 of each positive electrode of the plurality of electrode bodies 2 is connected to one current collector 5 (current collector 5 on the left side in FIG. 2). Further, the uncoated laminated portion 26 of each negative electrode of the plurality of electrode bodies 2 is connected to the other current collector 5 (current collector 5 on the right side in FIG. 2).

In the plurality of electrode bodies 2 arranged in the protruding direction, the adjacent electrode bodies 2 are liquid-entangled with each other on the outer peripheral surfaces (that is, the separator 25 of the outermost layer in the laminated body 22). The adjacent electrode bodies 2 of the present embodiment are liquid-entangled by bringing the outer peripheral surfaces (specifically, the separator 25 constituting the outer peripheral surface) into contact with each other. Further, the adjacent electrode bodies 2 of the present embodiment are always liquid-entangled with the outer peripheral surface in the charging / discharging process. Specifically, the cross section of the electrode body 2 orthogonal to the winding central axis C expands or contracts with charging or discharging, but in the power storage element 1 of the present embodiment, the adjacent electrode bodies 2 are charged and discharged. Regardless of the accompanying expansion and contraction, the separators 25 constituting the outer peripheral surface are always in contact (liquid entanglement). Here, the liquid junction is a state in which the electrolytic solution is guided from the separator 25 forming the outer peripheral surface of one electrode body 2 to the separator 25 forming the outer peripheral surface of the other electrode body 2 in the adjacent electrode bodies 2. say.

The case 3 has a case main body 31 having an opening and a lid plate 32 that closes (closes) the opening of the case main body 31. The case 3 houses the electrolytic solution in the internal space 33 (see FIG. 3) together with the plurality of electrode bodies 2 and the current collector 5. Therefore, the case 3 is formed of a metal having resistance to the electrolytic solution. Case 3 of the present embodiment is formed of, for example, aluminum or an aluminum-based metal material such as an aluminum alloy.

The case 3 is formed by joining the opening peripheral edge portion 34 of the case main body 31 and the peripheral edge portion of the lid plate 32 in a superposed state. Further, in the case 3, the internal space 33 is defined by the case main body 31 and the lid plate 32. In the case 3 of the present embodiment, the opening peripheral edge portion 34 of the case body 31 and the peripheral edge portion of the lid plate 32 are joined by welding.

The case body 31 includes a plate-shaped closing portion 311 and a cylindrical body portion 312 connected to the peripheral edge of the closing portion 311.

The closing portion 311 is located at the lower end of the case body 31 when the case body 31 is arranged with the opening facing upward (that is, becomes the bottom wall of the case body 31 when the opening faces upward). ) It is a part. The closed portion 311 has a rectangular shape when viewed from the normal direction of the closed portion 311.

In the following, the long side direction of the closed portion 311 is the X-axis direction of the Cartesian coordinate system, the short side direction of the closed portion 311 is the Y-axis direction of the Cartesian coordinate system, and the normal direction of the closed portion 311 is Z of the Cartesian coordinate system. Axial direction.

The body portion 312 has a square tube shape, specifically, a flat square tube shape. The body portion 312 has a pair of long wall portions 313 extending from the long side at the peripheral edge of the closed portion 311 and a pair of short wall portions 314 extending from the short side at the peripheral edge of the closed portion 311. That is, the pair of long wall portions 313 face each other with an interval in the Y-axis direction (specifically, the interval corresponding to the short side at the peripheral edge of the closed portion 311), and the pair of short wall portions 314 are spaced in the X-axis direction. (Specifically, they face each other with an interval corresponding to the long side at the peripheral edge of the closed portion 311). A square tubular body portion 312 is formed by connecting the end portions of the short wall portion 314 corresponding to each other (specifically, facing in the Y-axis direction) of the pair of long wall portions 313.

As described above, the case body 31 has a square tube shape (that is, a bottomed square tube shape) in which one end in the opening direction (Z-axis direction) is closed. As described above, each of the plurality of electrode bodies 2 is housed in the case body 31 in a state where the winding center axis C direction is directed toward the X axis direction and the plurality of electrode bodies 2 are arranged side by side in the Z axis direction.

The lid plate 32 is a plate-shaped member that closes the opening of the case body 31. Specifically, the contour of the lid plate 32 has a shape corresponding to the opening peripheral edge portion 34 of the case main body 31 when viewed from the Z-axis direction. That is, the lid plate 32 is a rectangular plate material long in the X-axis direction when viewed from the Z-axis direction. The lid plate 32 abuts on the case body 31 so as to close the opening of the case body 31. More specifically, the peripheral edge portion of the lid plate 32 is overlapped with the opening peripheral edge portion 34 of the case body 31 so that the lid plate 32 closes the opening. The boundary between the lid plate 32 and the case body 31 is welded in a state where the opening peripheral edge portion 34 and the lid plate 32 are overlapped with each other. As a result, the case 3 is configured.

The external terminal 4 is a portion electrically connected to an external terminal of another power storage element, an external device, or the like. The external terminal 4 is formed of a conductive member. For example, the external terminal 4 is formed of an aluminum-based metal material such as aluminum or an aluminum alloy, or a highly weldable metal material such as copper or a copper-based metal material such as a copper alloy. As shown in FIGS. 1 to 3, the external terminal 4 of the present embodiment has a surface 41 to which a bus bar or the like can be welded.

The current collector 5 is arranged in the case 3 and is directly or indirectly connected to each of the plurality of electrode bodies 2 so as to be energized. The current collector 5 of the present embodiment is directly connected to each of the uncoated laminated portions 26 of the plurality of electrode bodies 2. The current collector 5 is formed of a conductive member and is arranged along the inner surface of the case 3. In the current collector 5 of the present embodiment, the external terminal 4 and the plurality of electrode bodies 2 are connected so as to be energized.

Specifically, as shown in FIGS. 2 and 3, the current collector 5 has a first connecting portion 51 that is electrically connected to the external terminal 4 and a second that is electrically connected to a plurality of electrode bodies 2. The two connecting portions 52 have a bending portion 53 connecting the first connecting portion 51 and the second connecting portion 52. In the current collector 5, the bent portion 53 is arranged near the boundary between the lid plate 32 and the short wall portion 314 in the case 3, and the first connecting portion 51 extends from the bent portion 53 along the lid plate 32 and is the second. (2) The connecting portion 52 extends from the bent portion 53 along the short wall portion 314. The second connecting portion 52 is connected to a plurality of (three in this embodiment) uncoated laminated portions 26 of the electrode body 2 in a conductive state. The second connecting portion 52 of the present embodiment is joined to each of the uncoated laminated portions 26 of the plurality of electrode bodies 2 by, for example, laser welding.

The current collector 5 configured as described above is arranged on the positive electrode and the negative electrode of the power storage element 1, respectively. In the power storage element 1 of the present embodiment, the current collector 5 is arranged in the case 3 in the uncoated laminated portion 26 on the positive electrode side and the uncoated laminated portion 26 on the negative electrode side, respectively. The positive electrode current collector 5 and the negative electrode current collector 5 are formed of different materials. Specifically, the current collector 5 of the positive electrode is formed of, for example, aluminum or an aluminum alloy. The current collector 5 of the negative electrode is formed of, for example, copper or a copper alloy.

The insulating material 6 is arranged between the case 3 (specifically, the case body 31) and the plurality of electrode bodies 2. The insulating material 6 is formed of an insulating resin. The insulating material 6 of the present embodiment is formed in a bag shape by bending a sheet-shaped member having an insulating property cut into a predetermined shape.

As described above, the electrolytic solution is injected into the case 3. In the power storage element 1 of the present embodiment, as shown in FIG. 5, a larger amount of electrolytic solution than can be held by the plurality of electrode bodies 2 (specifically, the separator 25 of each electrode body 2) is injected into the case 3. ing. The amount of electrolytic solution (surplus electrolytic solution) accumulated in the case 3 without being held by the plurality of electrode bodies 2 is such that the winding central axis C of each of the plurality of electrode bodies 2 housed in the case 3 is horizontal. When the case 3 is arranged so as to be, the liquid level is set to be lower than the lower end 29 of the electrode body 2 located at the top in the case 3. That is, a state in which the plurality of electrode bodies 2 are immersed in the excess electrolytic solution (see the two-dot chain line in FIG. 5) may be used. In the power storage element 1 of the present embodiment, when the case 3 is arranged so that the winding central axes C of the plurality of electrode bodies 2 housed in the case 3 are horizontal, the electrode body 2 at the bottom is the lowest. Only is soaked in excess electrolyte. The surplus electrolytic solution is not limited to the electrolytic solution accumulated at the lower end of the case 3 regardless of the expansion / contraction of the electrode body 2 due to charging / discharging, as in the storage element 1 of the present embodiment. For example, in the surplus electrolytic solution, the electrodes 23 and 24 constituting the electrode body 2 are rapidly expanded by rapid charging or the like, and the electrolytic solution held by the separator 25 is extruded from the separator 25, whereby the case 3 case 3 is used. It may be an electrolytic solution accumulated at the lower end. Further, as the surplus electrolytic solution, the electrodes 23 and 24 constituting the electrode body 2 suddenly become the electrolytic solution accumulated at the lower end of the case 3 regardless of the expansion / contraction of the electrode body 2 due to charging / discharging, and the rapid charging or the like. The electrolytic solution that has expanded and held by the separator 25 may be both the electrolytic solution that has accumulated at the lower end of the case 3 by being pushed out from the separator 25.

The electrolytic solution is a non-aqueous electrolyte solution. The electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent. The organic solvent is, for example, cyclic carbonates such as propylene carbonate and ethylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethylmethyl carbonate. Electrolyte salts are LiClO ₄ , LiBF ₄ , LiPF ₆ , and the like. The electrolytic solution of the present embodiment contains 1 mol / L LiPF ₆ in a mixed solvent prepared by adjusting propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate in a ratio of propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 3: 2: 5. Is dissolved.

According to the above-mentioned power storage element 1, when the case 3 is arranged so that the winding central axis C of each electrode body 2 becomes horizontal by causing the adjacent electrode bodies 2 to liquid-entangle the outer peripheral surfaces with each other. (In the example shown in FIG. 5, when the case 3 is arranged with the surface 41 of the external terminal 4 facing upward), the surplus electrolytic solution (the electrolytic solution accumulated in the case 3) is contained in the case 3. Even if the electrode body 2 is located above the liquid surface (see FIG. 5), the electrolytic solution is from the lower electrode body 2 (for example, the electrode body 2 in contact with the surplus electrolytic solution) to the upper electrode body 2 (for example). For example, on the upper side of the lower electrode body 2, the surplus electrolytic solution is supplied to the electrode body 2) which is adjacent to each other and is not in contact with the surplus electrolytic solution in a state where the electrode body 2 and the outer peripheral surface are in contact with each other. It is supplied to the electrode body 2 located above the liquid level.

Further, in the power storage element 1 of the present embodiment, since the adjacent electrode bodies 2 have liquid entanglement with each other on the outer peripheral surfaces, the electrolytic solution is applied to each electrode body 2 through the portion where the adjacent electrode bodies 2 are liquid entangled with each other. Can be moved. Therefore, the bias of the electrolytic solution in the plurality of electrode bodies 2 in the case 3, that is, the bias of the holding amount of the electrolytic solution for each electrode body 2 can be suppressed.

In the power storage element 1 of the present embodiment, even if the cross section orthogonal to the winding central axis C of the electrode body 2 expands and contracts due to charging and discharging, the outer peripheral surfaces of the adjacent electrode bodies 2 are always liquid entangled with each other. Therefore, even if the case 3 is arranged so that the winding central axis C of each electrode body 2 is horizontal, the surplus electrolytic solution is always continuously supplied from the lower electrode body 2 to the upper electrode body 2.

Further, in the power storage element 1 of the present embodiment, the electrodes 23 and 24 and the separator 25 are wound in a laminated state in each of the plurality of electrode bodies 2. Further, the outer peripheral surface of each electrode body 2 is composed of a separator 25. As described above, since the outer peripheral surface of each of the plurality of electrode bodies 2 is composed of the separator 25 having an insulating property, the energy storage element 1 can surely insulate between the electrode bodies 2. Further, in the electrode body 2 in which the electrodes 23 and 24 and the separator 25 are wound in a laminated state, the electrolytic solution moves in the winding direction (circumferential direction) at the electrodes 23 and 24 (particularly the negative electrode 24). In addition to the above, the separator 25 moves in the thickness direction and the winding direction (circumferential direction). Therefore, the electrolytic solution supplied to the outer peripheral surface of the electrode body 2 is efficiently supplied (moved) to the winding center of the electrode body 2. Moreover, since the compressibility and resilience of the separator 25 are better than those of the electrodes 23 and 24, the separator 25 can absorb the expansion and contraction of the electrodes 23 and 24 in the electrode body 2, whereby the electrodes are charged and discharged. When the 23 and 24 are contracted and expanded, the separation between the adjacent electrode bodies 2 is suppressed.

Next, the second embodiment of the present invention will be described with reference to FIG. 6, but the same components as those of the first embodiment will not be repeated in detail using the same reference numerals, and only different configurations will be described in detail. explain. The second embodiment of the present invention is a power storage element.

The power storage element 1A includes a plurality of (three or more in this embodiment) electrode bodies 2, an electrolytic solution, a case 3, an external terminal 4, a current collector 5, and an insulating material 6. The plurality of electrode bodies 2 of the present embodiment are arranged at intervals in the Z-axis direction. Further, the power storage element 1A includes at least one liquid connection member 7 that is in contact with the outer peripheral surfaces of adjacent electrode bodies 2 (specifically, the separator 25 constituting the outer peripheral surface) and sucks up the electrolytic solution.

The liquid junction member 7 is formed of a porous member. The liquid entanglement member 7 liquid entangles the electrode bodies 2 with which the liquid entanglement member 7 is in contact with each other. The liquid-related member 7 contracts or expands in the direction in which the adjacent electrode bodies 2 are lined up (vertical direction in FIG. 6) as the electrode body 2 expands or contracts due to charging or discharging (following). The liquid-related members 7 of the present embodiment are arranged between the plurality of electrode bodies 2 (in the present embodiment, the number is one less than the number of the electrode bodies 2). That is, the power storage element 1A includes a plurality of liquid-related members 7. Further, the liquid junction member 7 of the present embodiment is arranged in a part of the winding center axis C direction between the electrode bodies 2. That is, the liquid entanglement member 7 locally entangles the adjacent electrode bodies 2 in the direction of the winding center axis C between the electrode bodies 2.

The liquid connection member 7 of the present embodiment is formed of a porous member of open cells from the viewpoint of liquid holding capacity. The liquid junction member 7 is formed of a porous resin. For example, specifically, the liquid junction member 7 is a porous polyolefin resin (a mixture of low-density or high-density polyethylene, ultra-high molecular weight polyethylene, polypropylene or polypropylene) and a porous PEEK resin from the viewpoint of flexibility and electrolytic solution resistance. , Porous latex resin, porous fluororesin. Further, the liquid junction member 7 may be formed of a mixture of these resins and inorganic particles or porous inorganic particles.

Further, in the power storage element 1A of the present embodiment, electrolysis capable of holding the liquid-related member 7 arranged on one side (upper side in FIG. 6) of the electrode body 2 (center electrode body 2 in FIG. 6) in the Z-axis direction can be held. The amount of the liquid is larger than the amount of the electrolytic liquid that can be held by the liquid junction member 7 arranged on the other side (lower side in FIG. 6) of the electrode body 2 (center electrode body 2 in FIG. 6) in the Z-axis direction. .. In the power storage element 1A of the present embodiment, the amount of the electrolytic solution that can be held by the liquid-related member 7 is adjusted by adjusting the volume of the liquid-related member 7. That is, in the power storage element 1A shown in FIG. 6, the volume of the upper liquid junction member 7 is larger than the volume of the lower liquid junction member 7.

The porous member can guide the electrolytic solution upward due to its liquid absorption property, liquid retention property, and the like. Therefore, like the power storage element 1A of the present embodiment, the outer peripheral surfaces of the adjacent electrode bodies 2 are liquid-entangled with each other by the porous member (liquid-related member 7) of open cells, so that the respective electrode bodies 2 are wound. Even if the case 3 is arranged so that the central axis C is horizontal, the surplus electrolytic solution is effectively supplied from the lower electrode body 2 to the upper electrode body 2 through the liquid junction member 7.

In the power storage element 1A of the present embodiment, the liquid-related member 7 contracts or expands in the Z-axis direction as the electrode body 2 expands or contracts due to charging or discharging. In this way, the liquid-related member 7 expands and contracts in accordance with the fluctuation of the distance between the outer peripheral surfaces of the electrode body 2 due to the charging and discharging of the power storage element 1A, so that the winding central axis C of each electrode body 2 becomes horizontal. Even if the power storage element 1A is charged and discharged and each electrode body 2 expands or contracts with the case 3 arranged so as to be such, the outer peripheral surfaces of the adjacent electrode bodies 2 continue to be entangled with each other by the liquid squeezing member 7. .. That is, the liquid entanglement member 7 continues to entangle the adjacent electrode bodies 2 with each other even when the power storage element 1A is in the completely discharged state and the fully charged state. As a result, in the power storage element 1A, the surplus electrolytic solution continues to be supplied from the lower electrode body 2 to the upper electrode body 2 in any state of the charging / discharging process.

In the power storage element 1A of the present embodiment, the amount of the electrolytic solution that can be held by the liquid junction member 7 arranged on one side of the central electrode body 2 in the Z-axis direction (direction orthogonal to the winding center axis C) is the said. It is larger than the amount of the electrolytic solution that can be held by the liquid junction member 7 arranged on the other side of the electrode body 2.

According to such a configuration, the winding central axis C of each electrode body 2 is horizontal, and the liquid-related member 7 arranged on one side thereof is above the liquid-related member 7 arranged on the other side. When the case 3 is arranged so as to be (see FIG. 6), the amount of electrolytic solution that the upper (one side) liquid junction member 7 can hold is larger than that of the lower (the other side) liquid junction member 7. .. Therefore, when the power storage element 1A is continuously used in such a posture, the lower electrode body 2 (the electrode body in contact with the lower liquid junction member 7 and above the lower liquid junction member 7). 2 (In the example shown in FIG. 6, the central electrode body 2)), the upper electrode body 2 (which is in contact with the upper liquid contact member 7 and is in contact with the upper liquid flow member 7), which is less likely to be supplied with the surplus electrolytic solution, It is possible to prevent the occurrence of a shortage of the electrolytic solution in the upper electrode body 2 (in the example shown in FIG. 6, the uppermost electrode body 2)).

Next, the third embodiment of the present invention will be described with reference to FIGS. 7 to 11, but the same components as those of the first embodiment and the second embodiment will be described in detail using the same reference numerals. Without repeating, only the different configurations will be described in detail. The third embodiment of the present invention is a power storage device.

As shown in FIGS. 7 to 10, the power storage device 10 includes a plurality of power storage elements 1B provided with an external terminal 4, a holding member 13 for holding the plurality of power storage elements 1B, and a bus bar 15 connected to the external terminal 4. , Equipped with. Further, the power storage device 10 includes a plurality of adjacent members 12 adjacent to the power storage element 1B, and an insulator 14 arranged between the plurality of power storage elements 1B and the holding member 13. The holding member 13 of the present embodiment holds a plurality of power storage elements 10 and a plurality of adjacent members 12 together.

The power storage element 1B includes a plurality of electrode bodies 2B around which the electrodes 23 and 24 are wound, a case 3 accommodating the plurality of electrode bodies 2B, and an external terminal protruding from the outer surface of the case 3 and conducting with the plurality of electrode bodies 2B. 4 and. Further, the power storage element 1B also includes a current collector 5 for conducting each of the plurality of electrode bodies 2B and the external terminal 4, and an insulating member 6 and the like arranged between the plurality of electrode bodies 2B and the case 3. ..

As shown in FIG. 11, in each of the plurality of electrode bodies 2B, the electrodes 23 and 24 are wound so that the diameters of the electrode bodies 2B in the orthogonal directions are the major axis dl and the minor axis ds. Specifically, each electrode body 2B has a winding core 21, a positive electrode (electrode) 23 wound around the winding core 21, a negative electrode (electrode) 24, and a separator 25. In the electrode body 2B, the positive electrode 23 and the negative electrode 24 are wound in a flat tubular shape (in the present embodiment, so as to be a so-called race track type) in a state where the positive electrode 23 and the negative electrode 24 are overlapped with each other via the separator 25. Further, the separator 25 is located on the outermost circumference of the electrode body 2B. Hereinafter, in the electrode body 2B, a portion where the positive electrode 23 and the negative electrode 24 are alternately overlapped with each other in a curved state via the separator 25 is referred to as a curved portion 20a. Further, in the electrode body 2B, a portion where the positive electrode 23 and the negative electrode 24 are alternately overlapped with each other via the separator 25 in a flat state is referred to as a flat portion 20b.

Returning to FIGS. 7 to 10, in the plurality of electrode bodies 2B each configured as described above, the winding central axes C are parallel to each other and the protrusion direction of the external terminal 4 (in FIG. 9 in FIG. 9). (Vertical direction) and the minor axis Ds direction of the electrode body 2B are aligned. Further, the adjacent electrode bodies 2B are arranged so that the separator 25 located on the outermost circumference is in contact with each other. That is, the plurality of electrode bodies 2B are arranged so that the flat portions 20b of the adjacent electrode bodies 2B are in contact with each other and the curved portions 20a bulge in the same direction. By accommodating the plurality of electrode bodies 2B in the case 3 in this way, the major axis dl of each electrode body 2B faces the same direction and the minor axis ds of each electrode body 2B faces the same direction in the case 3. ing.

Further, inside the case 3, a gap 330 is formed between the lid plate (cover) 32 and the electrode body 2B adjacent to the lid plate 32 (see FIG. 10). In the power storage element 1B of the present embodiment, a part of the external terminal 4, specifically, the portion 45 (see FIG. 10) in which the external terminal 4 is fixed to the lid plate 32 and connected to the current collector 5 is covered. A gap 330 is provided so as to project from the plate 32 toward the inside of the case 3 (downward in FIG. 10) so that the projecting portion (part of the external terminal 4) 45 does not come into contact with the electrode body 2B. Has been done.

The plurality of power storage elements 1B, each of which is configured as described above, are orthogonal to the major axis dl direction of the electrode body 2B (direction in which the external terminal 4 protrudes from the case 3 (Z-axis direction)) and the winding center of the electrode body 2B. They are lined up in a direction (Y-axis direction) orthogonal to the extending direction of the axis C (X-axis direction).

The adjacent member 12 is a member arranged between the power storage elements 1B arranged in the Y-axis direction (major axis dl direction) or in the Y-axis direction with respect to the power storage element 1B and the power storage element 1B (in the example of the present embodiment, the holding member 13). It is placed between (part of) and. The adjacent member 12 includes a plurality of types of adjacent members. The adjacent member 12 of the present embodiment includes a first adjacent member 121 arranged between adjacent power storage elements 1B and a second adjacent member 122 arranged outside the power storage element 1B at the end in the Y-axis direction. including.

The first adjacent member 121 has an insulating property and is arranged between the adjacent power storage elements 1B to secure an interval (creeping distance, etc.) between the power storage elements 1B. Specifically, the first adjacent member 121 extends in the XZ plane (the plane including the X axis and the Z axis), and is a fluid for temperature adjustment between the first adjacent member 121 and the adjacent power storage element 1B (the present embodiment). In the example of the above, the first main body portion 1211 forming a flow path through which air) can flow, and the power storage elements 1B and XZ extending from the first main body portion 1211 in the Y-axis direction and adjacent to the first main body portion 1211. It has a first regulating unit 1212 that regulates relative movement of the power storage element 1B in the XZ plane direction with respect to the first main body portion 1211 by abutting from the outside in the surface direction.

The second adjacent member 122 has an insulating property, and is arranged between the power storage element 1B and the holding member 13 (termination member 131) in the X-axis direction, whereby the power storage element 1B and the holding member 13 (termination member 131) are arranged. Secure the distance between and (creeping distance, etc.). Specifically, the second adjacent member 122 is a flow path that spreads in the XZ plane direction and allows a fluid for temperature adjustment (air in the example of the present embodiment) to flow between the second adjacent member 122 and the adjacent power storage element 1B. The second main body portion 1221 and the storage element 1B extending in the Y-axis direction from the second main body portion 1221 and adjacent to the second main body portion 1221 are brought into contact with each other from the outside in the XZ plane direction. It has a second regulating unit 1222 that regulates the relative movement of the element 1B with respect to the second main body portion 1221 in the XZ plane direction.

By surrounding the periphery of the plurality of power storage elements 1B and the plurality of adjacent members 12, the holding member 13 collectively holds the plurality of power storage elements 1B and the plurality of adjacent members 12. The holding member 13 is made of a conductive member such as metal. Specifically, the holding member 13 is a connecting member 132 that connects a pair of termination members 131 arranged on both sides of a plurality of storage elements 1B in the Y-axis direction (arrangement direction of the storage elements 1B) and a pair of termination members 131. And have.

Each of the pair of terminal members 131 is arranged so as to sandwich the second adjacent member 122 with the power storage element 1B arranged at the end in the Y-axis direction. The terminal member 131 spreads in the XZ plane direction.

The pair of connecting members 132 are arranged on both sides of the plurality of power storage elements 1B in the X-axis direction. Each of the pair of connecting members 132 is a pair of beam portions 1320 extending in the Y-axis direction and arranged at intervals in the Z-axis direction, and a pair of first connecting the ends of the pair of beam portions 1320. It has a connecting portion 1321 and a second connecting portion 1322 that connects a pair of beam portions 1320 to each other at an intermediate position in the Y-axis direction.

The insulator 14 has an insulating property. The insulator 14 is arranged between the connecting member 132 and the plurality of power storage elements 1B. Specifically, the insulator 14 covers a region of the connecting member 132 facing at least a plurality of power storage elements 1B. As a result, the insulator 14 insulates between the connecting member 132 and the plurality of power storage elements 1B.

The bus bar 15 is a plate-shaped member having conductivity such as metal. The bus bar 15 conducts the external terminals 4 of different power storage elements 1B to each other. A plurality of bus bars 15 (a number corresponding to a plurality of power storage elements 1B) are provided in the power storage device 10. The plurality of bus bars 15 of the present embodiment connect (conduct) all of the plurality of power storage elements 1B included in the power storage device 10 in series.

According to the above-mentioned power storage device 10, swelling in the arrangement direction of the power storage elements 1B (major axis dl direction of the electrode body 2B: Y-axis direction) in each case 3 of the plurality of power storage elements 1B is suppressed at the time of charging. The force applied to the holding member 13 (the force that pushes the pair of terminal members 131 in the direction of increasing the distance) is suppressed. Moreover, the swelling of the case 3 in the alignment direction of the storage elements 1B during charging is suppressed, that is, the change in the spacing between the external terminals 4 of the storage elements 1B in the alignment direction (change in the spacing in the Y-axis direction) is suppressed. Therefore, the generation of stress due to the change in the interval at the connection portion between the bus bar 15 and the external terminal 4 can be suppressed. This makes it possible to prevent damage to the connection portion between the bus bar 15 and the external terminal 4 due to expansion / contraction of the electrode body 2B during charging / discharging.

Further, in the power storage device 10 of the present embodiment, a gap 330 is formed between the lid plate 32 and the electrode body 2B adjacent to the lid plate 32 in the case 3 of each power storage element 1B. As a result, the expansion of the electrode body 2B in the minor axis ds direction (Z-axis direction) during charging is absorbed by the gap 330, and the expansion of the case 3 in the minor axis ds direction (Z-axis direction) can be suppressed. That is, in the power storage device 10 of the present embodiment, by matching the major axis dl direction of the electrode body 2B with the arrangement direction of the storage elements 1B, the swelling of the case 3 in the arrangement direction is suppressed and the holding member 13 at the time of charging is suppressed. The electrode body 2B and the case 3 (lid plate 32) formed in the direction in which the electrode body 2B easily expands (minor axis ds direction) while suppressing the force applied to (that is, the force to spread the pair of terminal members 131). By absorbing the expansion of the electrode body 2B in the minor axis ds direction during charging by the gap 330 between the and, and suppressing the expansion of the case 3 in the same direction, the case 3 at the connection portion between the bus bar 15 and the external terminal 4 The generation of stress due to swelling (bulging in the minor axis ds direction) is suppressed.

In the power storage device 10 of the present embodiment, in each power storage element 1B, a part 45 of the external terminals 4 projecting from the lid plate 32 toward the inside of the case 3 (downward in FIG. 10) is attached to the electrode body 2B. The gap 330 provided so as not to come into contact is used to absorb the expansion of the electrode body 2B in the minor axis ds direction and suppress the expansion of the case 3 in the Z-axis direction (minor axis ds direction).

Further, in the power storage device 10, the swelling of the case 3 in the arrangement direction (major axis dl direction: Y-axis direction) of the power storage elements 1B is suppressed, so that the force applied to the holding member 13 (that is, the pair of terminal members 131 is expanded. Since the force) is suppressed, it is possible to suppress the force of sandwiching the entire plurality of power storage elements 1B in the Y-axis direction by the pair of termination members 131. That is, the strength of the holding member 13 can be suppressed, and the dimensions (outer dimensions) of the power storage device 10 can be suppressed.

Further, when each power storage element 1B has a surplus electrolytic solution in the case 3, adjacent electrode bodies 2B in the case 3 of each power storage element 1B bring the separators 25 constituting the outer peripheral surface into contact with each other. That is, because the electrodes are entangled with each other, the case is such that the winding center axis C of each electrode body 2B is horizontal and the electrode body 2B at one end in the Z-axis direction is located above the electrode body 2B at the other end. When the power storage device 10 is arranged (in the example shown in FIG. 7, when the power storage device 10 is arranged with the surface 41 of the external terminal 4 of each power storage element 1B facing upward), the surplus electrolytic solution is contained in the case 3. Even if any of the electrode bodies 2B is located above the liquid level of the (electrolyte solution accumulated in the case 3), the electrode body 2B on the lower side (for example, an electrode in contact with the surplus electrolytic solution) Body 2B) to the upper electrode body 2B (for example, the electrode body 2B adjacent to each other and not in contact with the excess electrolytic solution in a state where the electrode body 2B and the outer peripheral surface are in contact with each other on the upper side of the lower electrode body 2B). Is supplied to. Therefore, the surplus electrolytic solution is supplied to the electrode body 2B located above the liquid level.

Next, the fourth embodiment of the present invention will be described with reference to FIG. 12, but different configurations are used without repeating detailed description using the same reference numerals for the same configurations as those of the first to third embodiments. Will be described in detail only. A fourth embodiment of the present invention is a mobile body.

The mobile body 500 includes a power storage element 1, a mobile body main body 501 on which the power storage element 1 is mounted, and a drive unit 502 that drives the mobile body main body 501 by the electric power supplied from the power storage element 1. The moving body 500 of the present embodiment is an automobile, the moving body main body 501 is a vehicle body, and the drive unit 502 is a motor. The mobile body 500 is not limited to an automobile, but may be an aircraft, a ship, a railroad, a construction machine, or the like. That is, any device may be used as long as it moves (runs, etc.) using the electric power supplied from the power storage element 1.

In the mobile body 500, in the power storage element 1, the terminal side portion (the end portion on the lid plate 32 side), which is the portion where the external terminal 4 in the case 3 protrudes, is on the opposite side to the terminal side portion in the case 3. It is arranged so as to be located above the site (the end on the closed portion 311 side).

In the mobile body 500 of the present embodiment, a plurality of power storage elements 1 are mounted on the mobile body main body 501 in the same posture. The mobile body 500 may be equipped with a power storage device 10 in which a plurality of power storage elements 1 are held by the holding member 13. Even in this case, the power storage device 10 is mounted on the mobile body body 501 so that the end of each power storage element 1 on the lid plate 32 side of the case 3 is located above the end of the case 3 on the closed portion 311 side. Will be done.

According to the above-mentioned moving body 500, in the power storage element 1 mounted on the moving body 500, since the adjacent electrode bodies 2 are entwined with each other on the outer peripheral surfaces, the electrolytic solution is discharged from the lower electrode body 2. It is supplied to the upper electrode body 2, whereby the excess electrolytic solution accumulated in the case 3 is supplied from the lower electrode body 2 to the upper electrode body 2.

Next, the fifth embodiment of the present invention will be described with reference to FIG. 13, but different configurations will be described without repeating detailed description using the same reference numerals for the same configurations as those of the first to third embodiments. Will be described in detail only. A fifth embodiment of the present invention is a power storage system.

The power storage system 600 is connected to the power storage element 1, the power storage system main body 601 on which the power storage element 1 is mounted, and the external terminal 4 of the power storage element 1, and the input of power and the output of power from the outside are output. It is provided with a possible input / output terminal 602. The power storage system 600 of the present embodiment is used for wind power generation, solar power generation, etc., the power storage system main body 601 is a housing installed at the installation location G, and the input / output terminal 601 is a wind turbine or a solar cell. , A terminal connected to an external power transmission system, etc. The power storage system 600 is not limited to a system that stores power generated by a windmill or a solar cell, but is a household system that stores inexpensive nighttime power, and a backup that constantly stores a certain amount of power in case of a disaster. It may be a system or the like.

In the power storage system 600, in the power storage element 1, the terminal side portion (the end portion on the lid plate 32 side), which is the portion where the external terminal 4 in the case 3 protrudes, is on the opposite side to the terminal side portion in the case 3. It is arranged so as to be located above the site (the end on the closed portion 311 side).

In the power storage system 600 of the present embodiment, a plurality of power storage elements 1 are mounted on the power storage system main body 601 in the same posture. A power storage device 10 in which a plurality of power storage elements 1 are held by the holding member 13 may be mounted. Even in this case, the power storage device 10 is mounted on the power storage system main body 601 so that the end of each power storage element 1 on the lid plate 32 side of the case 3 is located above the end of the case 3 on the closed portion 311 side. Will be placed.

According to the above-mentioned power storage system 600, in the power storage element 1 mounted on the power storage system 600, the electrode bodies 2 adjacent to each other are entwined with each other on the outer peripheral surfaces, so that the electrolytic solution is the lower electrode body 2. Is supplied to the upper electrode body 2 from the lower electrode body 2, whereby the excess electrolytic solution accumulated in the case 3 is supplied from the lower electrode body 2 to the upper electrode body 2.

The power storage element of the present invention, the power storage device including the power storage element, the moving body including the power storage element, and the power storage system including the power storage element are not limited to the above embodiments, and the gist of the present invention is described. Of course, various changes can be made within a range that does not deviate. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configurations of certain embodiments can be deleted.

In the power storage elements 1, 1A and 1B of the first to fifth embodiments, all of the plurality of electrode bodies 2 and 2B are liquid-entangled, but the configuration is not limited to this. At least a part (two or more) of the plurality of electrode bodies 2 and 2B may be liquid-entangled with each other.

In the power storage elements 1, 1A, and 1B of the first to fifth embodiments, the number of the electrode bodies 2 is three, but the configuration is not limited to this. The electrode bodies 2 and 2B may be two or four or more.

Further, in the storage elements 1, 1A and 1B of the first to fifth embodiments, the adjacent electrode bodies 2 and 2B are liquid-entangled in one storage element 1, 1A and 1B by one method. Not limited to the configuration. For example, in one storage element 1, 1A, 1B, a portion where adjacent electrode bodies 2 and 2B are liquid-entangled by contacting the outer peripheral surfaces and a liquid-related member 7 are adjacent to each other by sandwiching the liquid-related member 7 between the outer peripheral surfaces. There may be a portion where the matching electrode bodies 2 and 2B are entangled with each other.

Each of the plurality of electrode bodies 2 of the power storage elements 1 and 1A of the first and second embodiments has a cylindrical shape, but is not limited to this configuration. Each of the plurality of electrode bodies 2 has a flat cylindrical shape (a shape having a major axis dl and a minor axis ds) such as a so-called race track shape or an elliptical shape such as the power storage element 1B of the third embodiment. May be good.

In the power storage elements 1, 1A, and 1B of the first to fifth embodiments, a plurality of electrode bodies 2, 2B are arranged in a straight line in the Z-axis direction when viewed from the X-axis direction, but the configuration is not limited to this. .. As shown in FIG. 14, a plurality of electrode bodies 2 may be arranged in a wavy manner when viewed from the X-axis direction, and as shown in FIG. 15, electrodes which are arranged straight in the Z-axis direction when viewed from the X-axis direction. A plurality of rows of the body 2 may be arranged in the Y-axis direction. That is, the winding central axis C of each of the electrode bodies 2 and 2B is horizontal, and the electrode bodies 2 and 2B at one end in the alignment direction of the electrode bodies 2 and 2B are located above the electrode bodies 2 and 2B at the other end. When the case 3 is arranged, one of the adjacent electrode bodies 2, 2B is located on the upper side of the other electrode bodies 2, 2B, and the outer peripheral surfaces of each other are entangled with each other. You just have to.

In the power storage elements 1, 1A and 1B of the first to fifth embodiments, the adjacent electrode bodies 2 and 2B are always liquid-entangled in the charge / discharge process of the power storage elements 1, 1A and 1B. Not limited to. Adjacent electrode bodies 2, 2B may be liquid entangled with each other in a part of the charge / discharge process of the power storage elements 1, 1A, and 1B. That is, the adjacent electrode bodies 2 and 2B do not have to be in liquid entanglement at all times when the power storage elements 1, 1A and 1B are charged and discharged. Adjacent electrode bodies 2 and 2B are liquid junctions (outer peripheral surfaces each other) at a predetermined timing when the power storage elements 1, 1A and 1B are charged and discharged (for example, only when the electrode bodies 2 and 2B are expanded most). May come into contact with each other or the liquid junction member 7 arranged between the outer peripheral surfaces may come into contact with each outer peripheral surface). Even with such a configuration, the electrolytic solution is supplied from the lower electrode bodies 2 and 2B with respect to the upper electrode bodies 2 and 2B.

In the power storage elements 1, 1A and 1B of the first to fifth embodiments, the outer peripheral surfaces (outermost layers) of the plurality of electrode bodies 2 and 2B are configured by the separator 25, but the configuration is not limited to this. .. The outer peripheral surface of each of the plurality of electrode bodies 2 and 2B may be composed of electrodes (positive electrode 23 or negative electrode 24). Since the positive electrode active material layer 232 and the negative electrode active material layer 242 are also porous, the electrolytic solution is supplied to the outermost electrodes 23 and 24 so that the electrolytic solution reaches the winding center of the electrode bodies 2 and 2B. Be supplied.

In the power storage element 1 of the first embodiment, the amount of the electrolytic solution that can be held by each of the plurality of electrode bodies 2 (separator 25) is the same or substantially the same, but the configuration is not limited to this. For example, each of the plurality of electrode bodies 2 has an outer region 250 including an outer peripheral surface and only the separator 25 is wound, and the outer region of one of the adjacent electrode bodies 2 is the outer region 2. The number of turns of the separator 25 of 250 (the number of turns of the separator 25 in the region indicated by α of the upper electrode body 2A in FIG. 16) is the number of turns of the separator 25 in the outer region 250 of the other electrode body 2B of the adjacent electrode bodies 2. It may be larger than the number of turns (the number of turns of the separator 25 in the region indicated by β of the lower electrode body 2 in FIG. 16). According to such a configuration, when the case 3 is arranged so that the winding central axis C of each electrode body 2 is horizontal and one electrode body 2A is above the other electrode body 2B, the lower side is provided. More electrolytic solution than the outer region 250 of the electrode body 2 (the other electrode body 2B) is held in the outer region 250 of the upper electrode body 2 (one electrode body 2A). Therefore, when the power storage element 1 is continuously used in such a posture, it is possible to prevent a shortage of the electrolytic solution in the upper electrode body 2A, which is more difficult to supply the surplus electrolytic solution than the lower electrode body 2B. can.

In this case, it is preferable that the electrode body 2 on one side has a larger number of turns of the separator 25 in the outer region 250. According to such a configuration, when the case 3 is arranged so that the winding central axis C of each electrode body 2 is horizontal and the one side thereof is on the upper side, the outer side of the electrode body 2 on the upper side (the one side) is as large as possible. More electrolyte is retained in the region 250. Therefore, when the power storage element 1 is continuously used in such a posture, there is a shortage of the electrolytic solution in the upper electrode body 2 where it is difficult to supply the surplus electrolytic solution as compared with the lower electrode body 2 (the other side). It can be prevented more preferably.

Further, in the power storage element 1 of the first embodiment, the amount of the electrolytic solution that can be held by each of the plurality of electrode bodies 2 is adjusted by the number of turns of the separator 25 in the outer region 250, but the configuration is not limited to this. For example, the porosity of the separator 25 and the thickness of the separator 25 may be changed to adjust the amount of the electrolytic solution that can be held in the outer regions 250 of each of the plurality of electrode bodies 2.

In the power storage element 1A of the second embodiment, the amount of the electrolytic solution that can be held by each of the plurality of liquid junction members 7 is different, but all of them may be the same. Further, when three or more liquid-related members 7 are arranged, all the liquid-related members 7 may hold the same amount of electrolytic solution, and a part of the plurality of liquid-related members 7 may have the same amount. The electrolyte may be retained.

Further, in the power storage element 1A of the second embodiment, the amount of the electrolytic solution that can be held by each of the plurality of liquid junction members 7 is adjusted by the volume of the liquid junction member 7, but the configuration is not limited to this. For example, the amount of electrolytic solution that can be held by each of the plurality of liquid junction members 7 may be adjusted by changing the porosity, shape, and the like of the liquid junction member 7. Further, the number of liquid-related members 7 to be arranged may be changed for each of the adjacent electrode bodies 2.

In the power storage element 1A of the second embodiment, the liquid junction member 7 has flexibility, whereby the liquid junction member 7 contracts or expands in the Z-axis direction with expansion or contraction of the electrode body 2 due to charging or discharging. Not limited to the configuration. The liquid entanglement member 7 may be, for example, a porous inorganic sintered body.

Further, in the power storage element 1A of the second embodiment, the liquid junction member 7 is formed of a porous member, but the configuration is not limited to this. The liquid entanglement member 7 may be, for example, a member whose surface is liquefied, or a member having a slit (a plurality of thin grooves or the like) on the surface. That is, the liquid entanglement member 7 may have a function of sucking up the electrolytic solution from the lower electrode body 2 to the upper electrode body 2 by utilizing the capillary phenomenon or the like.

The member having a liquid affinity on the surface or the member having a slit on the surface is finely processed (laser, sandblast) on the surface of an organic material such as polyolefin or fluororesin or an inorganic material such as ceramic or glass. , Nanoimprint, etc.), surface functional group imparting treatment (corona discharge treatment, plasma treatment, etc.), etc., to improve liquidity-improved block-shaped or sheet-shaped member.

Further, in the power storage element 1A of the second embodiment, the liquid junction member 7 is a porous member with open cells, but may be a porous member with closed cells. For the liquid entanglement member 7, for example, a closed-cell porous member is used when restoration after compression is important, and an open-cell porous member is used when the liquid retention amount (liquid retention) is important. Use.

Further, in the above embodiment, the case where the power storage elements 1 and 1A are used as a non-aqueous electrolyte secondary battery (for example, a lithium ion secondary battery) capable of charging and discharging has been described, but the type and size (capacity) of the power storage element have been described. ) Is optional. Further, in the above embodiment, the lithium ion secondary battery has been described as an example of the power storage element, but the present invention is not limited thereto. For example, the present invention can be applied to various secondary batteries, other primary batteries, and storage elements of capacitors such as electric double layer capacitors.

The power storage elements (for example, batteries) 1 and 1A may be used in the power storage device (battery module when the power storage element is a battery) 11 as shown in FIG. The power storage device 11 includes at least two power storage elements 1, 1A, and a bus bar member 12 that electrically connects two (different) power storage elements 1, 1A to each other. In this case, the technique of the present invention may be applied to at least one power storage element 1, 1A.

Claims (21)

Multiple electrode bodies with wound electrodes and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution, and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
The plurality of electrode bodies are arranged in the protruding direction of the external terminal with their winding center axes parallel to each other.
A power storage element in which adjacent electrode bodies are brought into liquid contact with each other by bringing the outer peripheral surfaces of the electrode bodies into contact with each other. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case is provided in which the plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding central axes are parallel to each other.
As for the amount of the electrolytic solution accumulated in the case, the case is arranged so that the winding center axis of the housed electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. At that time, the liquid level is set to be lower than the lower end of the electrode body located at the top in the case.
A power storage element in which adjacent electrode bodies are brought into liquid contact with each other by bringing the outer peripheral surfaces of the electrode bodies into contact with each other. The power storage element according to claim 1 or 2, wherein the adjacent electrode bodies are always liquid-entangled with the outer peripheral surface in the charge / discharge process. Each of the plurality of electrode bodies has a separator and has a separator.
The electrode and the separator in each of the plurality of electrode bodies are wound in a laminated state.
The power storage element according to any one of claims 1 to 3, wherein the outer peripheral surface of the electrode body is composed of the separator. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution, and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
The plurality of electrode bodies are arranged in the protruding direction of the external terminal with their winding center axes parallel to each other.
Adjacent electrode bodies entangle the outer peripheral surfaces of the electrode bodies with each other.
Each of the plurality of electrode bodies has a separator and has a separator.
The electrode and the separator in each of the plurality of electrode bodies are wound in a laminated state.
The outer peripheral surface of the electrode body is composed of the separator.
Each of the plurality of electrode bodies has an outer region including the outer peripheral surface and around which only the separator is wound.
A power storage element in which the number of turns of the separator in the outer region of one of the adjacent electrode bodies is larger than the number of turns of the separator in the outer region of the other electrode body of the adjacent electrode bodies. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case is provided in which the plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding central axes are parallel to each other.
As for the amount of the electrolytic solution accumulated in the case, the case is arranged so that the winding center axis of the housed electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. At that time, the liquid level is set to be lower than the lower end of the electrode body located at the top in the case.
Adjacent electrode bodies entangle the outer peripheral surfaces of the electrode bodies with each other.
Each of the plurality of electrode bodies has a separator and has a separator.
The electrode and the separator in each of the plurality of electrode bodies are wound in a laminated state.
The outer peripheral surface of the electrode body is composed of the separator, and each of the plurality of electrode bodies has an outer region including the outer peripheral surface and around which only the separator is wound.
A power storage element in which the number of turns of the separator in the outer region of one of the adjacent electrode bodies is larger than the number of turns of the separator in the outer region of the other electrode body of the adjacent electrode bodies. The plurality of electrode bodies are arranged in a direction orthogonal to the winding center axis, and are arranged.
The power storage element according to claim 5 or 6, wherein the electrode body on one side in the orthogonal direction has a larger number of turns of the separator in the outer region. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution, and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
The plurality of electrode bodies are arranged in the protruding direction of the external terminal with their winding center axes parallel to each other.
Adjacent electrode bodies entangle the outer peripheral surfaces of the electrode bodies with each other.
In each of the plurality of electrode bodies, the electrodes are wound so that the diameters of the electrode bodies in the orthogonal directions are the major axis and the minor axis.
The plurality of electrode bodies are arranged inside the case so that the protruding direction of the external terminal and the minor axis direction of the electrode body coincide with each other. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case where the plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding central axes are parallel to each other, and a case where the plurality of electrodes are housed together with the electrolytic solution.
With an external terminal protruding from the outer surface of the case ,
As for the amount of the electrolytic solution accumulated in the case, the case is arranged so that the winding center axis of the housed electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. At that time, the liquid level is set to be lower than the lower end of the electrode body located at the top in the case.
Adjacent electrode bodies entangle the outer peripheral surfaces of the electrode bodies with each other.
In each of the plurality of electrode bodies, the electrodes are wound so that the diameters of the electrode bodies in the orthogonal directions are the major axis and the minor axis.
The plurality of electrode bodies are arranged inside the case so that the protruding direction of the external terminal and the minor axis direction of the electrode body coincide with each other. The plurality of power storage elements according to claim 8 or 9,
A holding member that holds the plurality of power storage elements, and
With a bus bar connected to the external terminal,
The plurality of power storage elements are arranged in the major axis direction of the electrode body,
The holding member has a pair of terminal members arranged on both sides of the plurality of power storage elements in the arrangement direction of the power storage elements, and a connecting portion for connecting the pair of terminal members.
The bus bar is a power storage device that connects external terminals of different power storage elements. The case of each power storage element has a case body having an opening and a lid on which the external terminal is arranged and closes the opening.
The power storage device according to claim 10, wherein a gap is formed between the lid and the electrode body inside the case. The power storage element according to any one of claims 1 to 11.
The mobile body on which the power storage element is mounted and the mobile body
A drive unit that drives the mobile body body by electric power supplied from the power storage element is provided.
The power storage element has an external terminal protruding from the outer surface of the case.
The power storage element is a moving body in which a terminal-side portion, which is a portion of the case where the external terminal protrudes, is arranged so as to be located above a portion of the case opposite to the terminal-side portion. The power storage element according to any one of claims 1 to 11.
The power storage system main body on which the power storage element is mounted and
It is provided with an input / output terminal that is connected to the external terminal of the power storage element and is capable of inputting power from the outside and outputting power to the outside.
The power storage element is a power storage system in which a terminal-side portion, which is a portion of the case where the external terminal protrudes, is arranged so as to be located above a portion of the case opposite to the terminal-side portion. Multiple electrode bodies around which the electrodes are wound, and
A case for accommodating the plurality of electrode bodies and
An external terminal that protrudes from the outer surface of the case and conducts with the plurality of electrode bodies is provided.
In each of the plurality of electrode bodies, the electrodes are wound so that the diameters in the orthogonal directions in the electrode body are the major axis and the minor axis.
The plurality of electrode bodies are arranged inside the case in a state where the winding center axes are parallel to each other and the protruding direction of the external terminal and the minor axis direction of the electrode body coincide with each other.
The case has a case body having an opening and a lid that closes the opening and in which the external terminal is arranged.
A gap is formed between the lid and the electrode body inside the case, and a gap is formed.
A power storage element in which adjacent electrode bodies are brought into liquid contact with each other by bringing the outer peripheral surfaces of the electrode bodies into contact with each other. Multiple electrode bodies around which the electrodes are wound, and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution , and
An external terminal protruding from the outer surface of the case and conducting with the plurality of electrode bodies,
With at least one liquid connection member that sucks up the electrolytic solution,
In each of the plurality of electrode bodies, the electrodes are wound so that the diameters in the orthogonal directions in the electrode body are the major axis and the minor axis.
The plurality of electrode bodies are arranged inside the case in a state where the winding center axes are parallel to each other and the protruding direction of the external terminal and the minor axis direction of the electrode body coincide with each other.
The case has a case body having an opening and a lid that closes the opening and in which the external terminal is arranged.
A gap is formed between the lid and the electrode body inside the case, and a gap is formed.
The liquid-related member is sandwiched between the adjacent electrode bodies in a state of being in contact with the outer peripheral surfaces of the adjacent electrode bodies without surrounding the periphery of the electrode bodies.
A power storage element in which the outer peripheral surfaces of the adjacent electrode bodies are liquid-entangled with each other by the liquid-related member. The plurality of power storage elements according to claim 14 or 15, and
A holding member that holds the plurality of power storage elements, and
With a bus bar connected to the external terminal,
The plurality of power storage elements are arranged in the major axis direction of the electrode body,
The holding member has a pair of terminal members arranged on both sides of the plurality of power storage elements in the arrangement direction of the power storage elements, and a connecting portion for connecting the pair of terminal members.
The bus bar is a power storage device that connects external terminals of different power storage elements. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case in which the plurality of electrode bodies are housed together with the electrolytic solution, and
An external terminal protruding from the outer surface of the case and conducting with the plurality of electrode bodies,
With at least one liquid connection member that sucks up the electrolytic solution,
The plurality of electrode bodies are arranged in the protruding direction of the external terminal with their winding center axes parallel to each other.
The liquid-related member is sandwiched between the adjacent electrode bodies in a state of being in contact with the outer peripheral surfaces of the adjacent electrode bodies without surrounding the periphery of the electrode bodies.
A power storage element in which the outer peripheral surfaces of the adjacent electrode bodies are liquid-entangled with each other by the liquid-related member. Multiple electrode bodies with wound electrodes and
With the electrolyte
A case where the plurality of electrode bodies are housed together with the electrolytic solution in a state where the winding central axes are parallel to each other, and a case where the plurality of electrodes are housed together with the electrolytic solution.
With at least one liquid connection member that sucks up the electrolytic solution,
As for the amount of the electrolytic solution accumulated in the case, the case is arranged so that the winding center axis of the housed electrode body is horizontal and the electrode body at one end is located above the electrode body at the other end. At that time, the liquid level is set to be lower than the lower end of the electrode body located at the top in the case.
The liquid-related member is sandwiched between the adjacent electrode bodies in a state of being in contact with the outer peripheral surfaces of the adjacent electrode bodies without surrounding the periphery of the electrode bodies.
A power storage element in which the outer peripheral surfaces of the adjacent electrode bodies are liquid-entangled with each other by the liquid-related member. The power storage element according to claim 15, 17 or 18, wherein the liquid junction member is formed of a porous member having open cells. The power storage according to any one of claims 15 and 17 to 19, wherein the liquid-related member contracts or expands in the direction in which the adjacent electrode bodies are lined up as the electrode body expands or contracts due to charging or discharging. element. Three or more of the electrode bodies are arranged,
The amount of the electrolytic solution that can be held by the liquid junction member arranged on one side of the electrode body in the direction orthogonal to the winding center axis is the liquid arranged on the other side of the electrode body in the orthogonal direction. The power storage element according to any one of claims 15 and 17 to 20, wherein the amount of the electrolytic solution that can be held by the entwining member is larger than that of the electrolytic solution.

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