WO2021059630A1

WO2021059630A1 - Active material holding member, electrode, lead acid storage battery, and electric vehicle

Info

Publication number: WO2021059630A1
Application number: PCT/JP2020/024467
Authority: WO
Inventors: 啓太鈴木
Original assignee: 昭和電工マテリアルズ株式会社
Priority date: 2019-09-27
Filing date: 2020-06-22
Publication date: 2021-04-01
Also published as: CN114930573B; JPWO2021059630A1; CN114930573A; WO2021059532A1

Abstract

An active material holding member 50a which is provided with a first tube 60 and second tube 61 arranged side by side, wherein: the first tube 60 is formed by having a base material 64 rolled up at least once in a counterclockwise direction; and a roll end part 66a of the base material 64 at one end of the first tube 60 is positioned within the range of from 0° to +90° on the surface of the first tube 60 with respect to the central axis of the first tube 60 if the direction in which the second tube 61 is arranged with respect to the first tube 60 is taken as 0° when the first tube 60 is viewed from the above-described one end side of the first tube 60 in the axial direction of the first tube 60.

Description

Active material holding members, electrodes, lead-acid batteries and electric vehicles

The present invention relates to an active material holding member, an electrode, a lead storage battery, and an electric vehicle.

Lead-acid batteries are widely used as secondary batteries for industrial or consumer use, and in particular, lead-acid batteries for electric vehicles (for example, lead-acid batteries for automobiles, so-called batteries), UPS (Uninterruptable Power Supply), and disaster prevention (emergency). ) There is a great demand for lead-acid batteries for backup such as wireless power supplies and telephone power supplies.

In a lead-acid battery, an active material holding member having a plurality of tubes adjacent to each other may be used as a tube capable of holding (accommodating) the active material. For example, a lead-acid battery has an active material holding member provided with a tube, a core metal (current collector) inserted in the tube, and an electrode material (electrode material containing an active material) filled between the tube and the core metal. ) Is provided (see, for example, Patent Document 1 below).

Japanese Unexamined Patent Publication No. 8-203506

By the way, as the tube of the active material holding member, a tube formed by winding a base material may be used. In such a tube, the winding end of the base material is fixed on the surface of the tube at the end of the tube in the axial direction of the tube, but the base material is wound due to the external stress applied to the base material. The active material may leak from the tube due to fraying (peeling from the surface of the tube) starting from. Therefore, the active material holding member provided with the tube is required to suppress the leakage of the active material from the viewpoint of improving the battery characteristics.

One aspect of the present invention is to provide an active material holding member capable of suppressing leakage of an active material. Another aspect of the present invention is to provide an electrode having the active material holding member, a lead storage battery provided with the electrode, and an electric vehicle provided with the lead storage battery.

A first embodiment of one aspect of the present invention is an active material holding member including a first tube and a second tube juxtaposed with each other, wherein the first tube has at least a base material counterclockwise. The wound end portion of the base material at one end of the first tube is formed by being wound around the first tube in the axial direction of the first tube from the one end side of the first tube. When looking at the first tube, the direction in which the second tube is attached to the first tube is 0 °, and 0 ° or more on the surface of the first tube with respect to the central axis of the first tube. Provided is an active material holding member located in the range of + 90 ° or less.

A second embodiment of one aspect of the present invention is an active material holding member including a first tube and a second tube adjacent to each other, wherein the first tube has a base material at least once in a clockwise direction. The wound end portion of the base material at one end of the first tube is formed by being wound around the first tube from the one end side of the first tube in the axial direction of the first tube. When the tube is viewed, the direction in which the second tube is attached to the first tube is 0 °, and −90 ° or more on the surface of the first tube with respect to the central axis of the first tube. Provided is an active material holding member located in a range of 0 ° or less.

In the active material holding member including the first tube and the second tube adjacent to each other, when the first tube is formed by winding the base material, at least one of the first tubes. At the end of the substrate, a load is applied to a portion (extending portion) of the base material extending from between the first tube and the second tube along the surface of the first tube in the circumferential direction of the first tube. Due to external stress, the base material tends to fray easily starting from the winding end.

On the other hand, in the active material holding member according to the first embodiment, the first tube is formed by winding the base material counterclockwise at least once, and the base material at one end of the first tube is formed. When the winding end portion looks at the first tube from one end side of the first tube in the axial direction of the first tube, the first tube is set to 0 ° with respect to the direction in which the second tube is attached to the first tube. It is located in the range of 0 ° or more and + 90 ° or less on the surface of the first tube with respect to the central axis of the tube. In this case, at one end of the first tube, a portion (extending) extending from between the first tube and the second tube in the base material along the surface of the first tube in the circumferential direction of the first tube. The length of the portion) is shorter than that in the case where the winding end portion is located in a range exceeding + 90 ° on the surface of the first tube. As a result, since the frequency of external stress being applied to the extending portion is low, the base material is less likely to fray from the winding end portion, and the leakage of the active material is suppressed.

In the active material holding member according to the second embodiment, the first tube is formed by winding the base material clockwise at least once, and the winding end portion of the base material at one end of the first tube. However, when the first tube is viewed from one end side of the first tube in the axial direction of the first tube, the direction in which the second tube is attached to the first tube is set to 0 °, and the first tube It is located in the range of −90 ° or more and 0 ° or less on the surface of the first tube with respect to the central axis. In this case, at one end of the first tube, a portion (extending) extending from between the first tube and the second tube in the base material along the surface of the first tube in the circumferential direction of the first tube. The length of the portion) is shorter than that in the case where the winding end portion is located in a range of less than −90 ° on the surface of the first tube. As a result, since the frequency of external stress being applied to the extending portion is low, the base material is less likely to fray from the winding end portion, and the leakage of the active material is suppressed.

Another aspect of the present invention provides an electrode having the above-mentioned active material holding member and the active material held in the first tube and the second tube of the active material holding member.

Another aspect of the present invention provides a lead-acid battery comprising a positive electrode and a negative electrode, wherein at least one selected from the group consisting of the positive electrode and the negative electrode is the above-mentioned electrode.

Another aspect of the present invention provides an electric vehicle equipped with the lead-acid battery described above.

According to one aspect of the present invention, it is possible to provide an active material holding member capable of suppressing leakage of the active material. According to another aspect of the present invention, it is possible to provide an electrode having the active material holding member, a lead storage battery provided with the electrode, and an electric vehicle provided with the lead storage battery.

It is a schematic perspective view which shows the example of a tube. It is a schematic cross-sectional view which shows the lead-acid battery which concerns on one Embodiment of this invention. It is a schematic cross-sectional view which shows the lead-acid battery which concerns on one Embodiment of this invention. It is a schematic side view which shows the active material holding member which concerns on one Embodiment of this invention. It is a schematic plan view which shows the active material holding member which concerns on one Embodiment of this invention. It is a schematic side view which shows the active material holding member which concerns on another Embodiment of this invention. It is a schematic plan view which shows the active material holding member which concerns on another Embodiment of this invention. It is a schematic plan view which shows the active material holding member which concerns on other embodiment of this invention. It is a schematic plan view which shows the active material holding member which concerns on other embodiment of this invention. It is a schematic plan view which shows the active material holding member which concerns on other embodiment of this invention. It is a schematic plan view which shows the active material holding member which concerns on other embodiment of this invention.

Hereinafter, a mode for carrying out the present invention will be described in detail with reference to the drawings as appropriate. However, the present invention is not limited to the following embodiments. The drawings may show a Cartesian coordinate system defined by the X, Y and Z axes that are orthogonal to each other.

In the present specification, the numerical range indicated by using "-" indicates a range including the numerical values before and after "-" as the minimum value and the maximum value, respectively. In the numerical range described stepwise in the present specification, the upper limit value or the lower limit value of the numerical range of one step can be arbitrarily combined with the upper limit value or the lower limit value of the numerical range of another step. "A or B" may include either A or B, or both. Unless otherwise specified, the materials exemplified in the present specification may be used alone or in combination of two or more. The term "process" is included in this term not only in an independent process but also in the case where the desired action of the process is achieved even if it cannot be clearly distinguished from other processes. "Axial direction of the tube" means the axial direction (longitudinal direction) of the central axis of the tube. One end and the other end of the tube mean one end and the other end of the tube in the axial direction. "At least one" means one or more. "At least part" means part or all.

The lead-acid battery according to the present embodiment includes a positive electrode and a negative electrode, and at least one selected from the group consisting of the positive electrode and the negative electrode is the electrode according to the present embodiment. The electrode according to the present embodiment has an active material holding member according to the present embodiment and an active material held in a tube (first tube, second tube, etc., which will be described later) of the active material holding member. .. The lead-acid battery according to the present embodiment may include a separator arranged between the positive electrode and the negative electrode, and may not include the separator. The lead storage battery according to the present embodiment may include an electrolytic solution. The electrolytic solution may contain sulfuric acid. The lead-acid battery according to the present embodiment may be a liquid-type lead-acid battery, a control valve-type lead-acid battery, or the like, and may be a closed-type lead-acid battery, an open-type lead-acid battery, or the like.

The active material holding member according to the present embodiment (including the first to fourth embodiments and other embodiments; the same applies hereinafter) includes a first tube and a second tube adjacent to each other. Be prepared. That is, the active material holding member according to the present embodiment is a group of active material holding tubes having a plurality of tubes adjacent to each other. The active material holding member according to the present embodiment may include three or more tubes. The active material holding member is a member for holding the active material of the battery, and can hold (accommodate) the active material inside the tube (internal space). The "active material" includes both the post-chemical active material and the raw material of the pre-chemical active material.

In the active material holding member according to the first embodiment and the second embodiment, from the viewpoint of suppressing leakage of the active material, the first tube is formed by winding the base material counterclockwise at least once. The wound end portion of the base material at one end of the first tube is the first tube with respect to the first tube when the first tube is viewed from one end side of the first tube in the axial direction of the first tube. It is located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less on the surface of the first tube with respect to the central axis of the first tube, where 0 ° is the side-by-side direction of the two tubes. In the active material holding member according to the third embodiment and the fourth embodiment, from the viewpoint of suppressing leakage of the active material, the first tube is formed by winding the base material clockwise at least once. The winding end of the base material at one end of the first tube is a second with respect to the first tube when the first tube is viewed from one end side of the first tube in the axial direction of the first tube. It is located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less on the surface of the first tube with respect to the central axis of the first tube, where 0 ° is the side-by-side direction of the tubes.

When the first tube to be evaluated is formed by winding the base material counterclockwise, the angle (position) of the winding end portion is 0 ° at the winding end portion of the first tube. The angle with respect to the side-by-side direction of the second tube with respect to the first tube when the second tube is arranged on the right side of the first tube while being located in the angle range (0 to π radian) of + 180 ° or more is used. .. When the first tube to be evaluated is formed by winding the base material clockwise, the angle (position) of the winding end portion is -180 ° at the winding end portion of the first tube. The angle with respect to the side-by-side direction of the second tube with respect to the first tube when the second tube is arranged on the right side of the first tube while being located in the angle range (π to 2π radians) of 0 ° or more is used. .. For an article having a plurality of tubes attached to each other, as a tube attachment portion composed of two tubes attached to each other, the tube attachment portion satisfying the above-mentioned angle range of the first to fourth embodiments is the article. When the article is held in at least a part of the article, the tube-attached portion of the article corresponds to the active material holding member according to the first to fourth embodiments.

The electrode according to the present embodiment may have at least one of the active material holding members according to the first to fourth embodiments as at least one active material holding member. That is, the electrode according to the present embodiment may have a single type of active material holding member, or may have a plurality of types of active material holding member.

In the active material holding member according to the first embodiment and the second embodiment, from the viewpoint of further suppressing the leakage of the active material, the winding end portion of the base material at the other end of the first tube is the first tube. When the first tube is viewed from the other end side in the axial direction, the surface of the first tube with respect to the central axis of the first tube is set to 0 ° with respect to the first tube. It may be located in an angle range of 0 ° or more and + 90 ° or less in. In the active material holding member according to the third embodiment and the fourth embodiment, from the viewpoint of further suppressing the leakage of the active material, the winding end portion of the base material at the other end of the first tube is the first tube. When the first tube is viewed from the other end side in the axial direction, the surface of the first tube with respect to the central axis of the first tube is set to 0 ° with respect to the first tube. It may be located in an angle range of −90 ° or more and 0 ° or less.

In the active material holding member according to the first embodiment, the first tube is formed by spirally winding the base material counterclockwise at least once from the other end to one end of the first tube. Has been done. In the active material holding member according to the second embodiment, the first tube is formed by winding the base material counterclockwise in a spiral shape at least once. In the active material holding member according to the third embodiment, the first tube is formed by spirally winding the base material clockwise at least once from the other end to one end of the first tube. ing. In the active material holding member according to the fourth embodiment, the first tube is formed by winding the base material clockwise at least once in a spiral shape.

The base material may be wound at least once, may be wound more than one round, and may be wound a plurality of times. As shown in FIG. 1A, the “spiral” means traveling in the extending direction of the central axis while orbiting around the central axis extending in a predetermined direction. "Swirl" means to orbit in the same plane as shown in FIG. 1 (b). For example, in the case of a spiral shape, the tube expands as the base material is wound, whereas in the spiral shape, the tube becomes thicker as the base material is wound, but the tube does not expand. The winding direction (counterclockwise and clockwise) in the spiral case means the direction of rotation of the base material with respect to the central axis. The winding direction (counterclockwise and clockwise) in the case of a spiral means the winding direction when the base material is wound from the inner layer to the outer layer of the tube.

The tube has, for example, end faces perpendicular to the axial direction of the tube at one end and the other end. In the case of a spiral shape, for example, a strip-shaped base material can be spirally wound to form a tube. In this case, after forming the tube, both ends of the tube may be cut perpendicular to the axial direction of the tube, and a base material having a shape that can obtain an end face perpendicular to the axial direction of the tube without cutting the ends is used. May be good. When the base materials are rotated in a spiral shape, the base materials may overlap each other (the overlapping portions of the base materials may be formed), and the base materials do not have to overlap each other. In the case of a spiral shape, for example, a rectangular base material can be wound along one side of the base material to form a tube. Examples of the means for joining the base materials include welding (for example, ultrasonic welding), an adhesive, and the like. In the case of the spiral shape, since the joint portion between the base materials is formed in a spiral shape, even if a part of the joint portion is cleaved, it is difficult for the cleaved portion to expand as compared with the case of the spiral shape. Therefore, it is easy to suppress the leakage of active material. Further, in the case of a spiral shape, the length of the tube can be easily adjusted by adjusting the number of windings of a base material having a constant width.

An example of the lead storage battery according to the present embodiment will be described with reference to FIGS. 2 and 3. 2 and 3 are schematic cross-sectional views showing an example of a lead storage battery. In FIG. 2, positive electrodes and negative electrodes are alternately arranged via separators from the front side to the back side of the drawing. FIG. 2B is an enlarged view showing the region P of FIG. 2A. In FIG. 2A, the details inside the tubes and the details of the portions where the tubes are adjacent to each other are omitted. The lead-acid batteries shown in FIGS. 2 and 3 are provided with an electric tank extending in the vertical direction, and FIG. 3 shows a positive electrode when the lead-acid battery is viewed from above in the vertical direction (above in the height direction of the electric tank). , The laminated structure of the negative electrode and the separator is shown.

The lead-acid battery 100 shown in FIGS. 2 and 3 is connected to an electrode group 110, an electric tank 120 accommodating the electrode group 110, connecting

members

130a and 130b connected to the electrode group 110, and connecting

members

130a and 130b. The

electrode columns

140a and 140b are provided, a liquid port plug 150 for closing the liquid injection port of the electric tank 120, and a support member 160 connected to the electric tank 120.

The electrode group 110 includes a plurality of positive electrodes 10, a plurality of negative electrodes 20, and a plurality of separators 30. The positive electrode 10 and the negative electrode 20 are alternately arranged via the separator 30. The space around the positive electrode 10 between the separators 30 is filled with the electrolytic solution 40. The electrolytic solution 40 may contain sulfuric acid. The electrolytic solution 40 may contain aluminum ions, sodium ions and the like.

The positive electrode 10 is, for example, a plate-shaped electrode (positive electrode plate), and includes a plurality of tubes 10a for holding an active material, a core metal (current collector) 10b, a positive electrode material 10c, a lower joint 10d, and an upper joint. It has 10e and an ear portion 10f. The tube 10a of the positive electrode 10 is formed of a tubular portion capable of accommodating the positive electrode material 10c containing an active material.

The plurality of tubes 10a are arranged side by side with each other to form the active material holding member 50. That is, the positive electrode 10 has an active material holding member 50. Each tube 10a extends in the height direction (vertical direction) of the electric tank 120.

The core metal 10b extends in the axial direction of the tube 10a at the center of the tube 10a. The constituent material of the core metal 10b may be any conductive material, and examples thereof include lead alloys such as lead-calcium-tin alloys and lead-antimony-arsenic alloys. The cross-sectional shape of the core metal 10b perpendicular to the axial direction (longitudinal direction) may be circular, elliptical, or the like. The length of the core metal 10b is, for example, 160 to 650 mm. The diameter of the core metal 10b is, for example, 2.0 to 4.0 mm.

The positive electrode material 10c is filled between the tube 10a and the core metal 10b. The positive electrode material 10c contains a positive electrode active material after chemical conversion. The chemicalized positive electrode material can be obtained, for example, by chemicalizing an unchemicald positive electrode material containing a raw material for the positive electrode active material. Examples of the raw material for the positive electrode active material include lead powder and lead tan. Examples of the positive electrode active material in the positive electrode material after chemical conversion include lead dioxide and the like. The positive electrode material 10c can further contain an additive if necessary. Examples of the additive for the positive electrode material 10c include short reinforcing fibers. Examples of the reinforcing short fibers include acrylic fibers, polyethylene fibers, polypropylene fibers, polyethylene terephthalate fibers (PET fibers) and the like.

The lower punishment 10d is connected to one end of the tube 10a (lower end in the figure), and the upper punishment 10e is connected to the other end of the tube 10a (upper end in the figure). The lower joint 10d and the upper joint 10e are in contact with the tube 10a and the core metal 10b and the positive electrode material 10c arranged in the tube 10a, and hold the tube 10a, the core metal 10b, and the positive electrode material 10c. The lower collective punishment 10d is attached to the bottom end of the battery case 120 in the tube 10a (the end on one end of the tube 10a). The lower joint 10d is fitted to the end of the tube 10a, and has a base extending in a direction orthogonal to the axial direction of the tube 10a and a plurality of fittings connected to the base and fitted to the end of the tube 10a. It has a joint part. The fitting portion is formed with a recess into which the end portion of the core metal 10b is inserted. The upper collective punishment 10e is attached to the upper end of the electric tank 120 in the tube 10a (the other end of the tube 10a).

One end of the selvage 10f (lower end in the figure) is connected to the upper collective punishment 10e, and the other end of the selvage 10f (upper end in the figure) is connected to the connecting member 130a. The core metal 10b housed in the tube 10a is electrically connected to the pole pillar 140a via the upper connecting seat 10e, the selvage portion 10f, and the connecting member 130a.

The support member 160 has a plurality of protrusions 160a extending in the axial direction (longitudinal direction, for example, the height direction of the electric tank 120) of the tube 10a, and the lower joint 10d is fixed in contact with the plurality of protrusions 160a. ing. That is, the support member 160 supports the bottom surface side portion of the electric tank 120 in the lower collective punishment 10d by each protrusion 160a.

The negative electrode 20 is, for example, a plate-shaped negative electrode plate, for example, a paste type negative electrode plate. The negative electrode 20 has a negative electrode current collector and a negative electrode material held by the negative electrode current collector. As the negative electrode current collector, a plate-shaped current collector can be used. The composition of the negative electrode current collector and the core metal 10b of the positive electrode 10 may be the same or different from each other. The negative electrode 20 is electrically connected to the pole pillar 140b via the connecting member 130b.

The negative electrode material contains the negative electrode active material after chemical conversion. The chemical negative electrode material can be obtained, for example, by chemicalizing an unchemicald negative electrode material containing a raw material for the negative electrode active material. Examples of the raw material for the negative electrode active material include lead powder and the like. Examples of the negative electrode active material in the negative electrode material after chemical conversion include porous spongy lead and the like. The negative electrode material can further contain an additive if necessary. Examples of the additive for the negative electrode material include barium sulfate, reinforcing short fibers, and a carbon material (carbonaceous conductive material). As the reinforcing short fiber, the same reinforcing short fiber as the positive electrode material can be used. Examples of the carbon material include carbon black and graphite. Examples of carbon black include furnace black (Ketjen black (registered trademark), etc.), channel black, acetylene black, thermal black, and the like.

The material of the separator 30 is not particularly limited as long as it is a material that blocks the electrical connection between the positive electrode 10 and the negative electrode 20 and allows the electrolytic solution to permeate. Examples of the material of the separator 30 include microporous polyethylene; a mixture of glass fiber and synthetic resin.

Next, various aspects of the active material holding member will be described with reference to FIGS. 4 to 7. 4 and 5 are views showing an example of the active material holding member according to the first embodiment. 6 and 7 are views showing an example of the active material holding member according to the third embodiment. 4 and 6 are schematic side views showing the active material holding member. 5 and 7 are schematic plan views of the active material holding member when viewed from the axial direction of the tube. 5 (a) is a schematic plan view when viewed from the arrow Va in FIG. 4, and FIG. 5 (b) is a schematic plan view when viewed from the arrow Vb in FIG. FIG. 7A is a schematic plan view when viewed from the arrow VIIa in FIG. 6, and FIG. 7B is a schematic plan view when viewed from the arrow VIIb in FIG. In FIGS. 5 and 7, for convenience, the thickness of the base material constituting the tube is not shown. Although only four tubes are shown in FIGS. 4 to 7 for convenience, the active material holding member may include five or more tubes.

The active material holding member 50a shown in FIGS. 4 and 5 includes a first tube 60, a second tube 61, a third tube 62, and a fourth tube 63 that are adjacent to each other. The first tube 60 has one end 60a and the other end 60b. The first tube 60 is formed by spirally winding the base material 64 a plurality of times counterclockwise from the other end 60b toward one end 60a. The first tube 60 is formed, for example, by winding the base material 64 from the other end 60b to one end 60a of the first tube 60. The base material 64 is spirally wound a plurality of times counterclockwise around the central axis 60c of the first tube 60. In the first tube 60, for example, the base material having the first side and the second side facing each other is wound n + 1 times around the first side located on the other end 60b side at the time of the nth winding. It can be obtained by winding so that the second sides overlap at the time of turning. The cross section of the first tube 60 perpendicular to the axial direction of the first tube 60 is, for example, a perfect circle.

The second tube 61 is adjacent to the first tube 60. The third tube 62 is adjacent to the second tube 61. The fourth tube 63 is adjacent to the first tube 60 and is attached to the first tube 60 on the opposite side of the first tube 60 from the second tube 61. The second tube 61, the third tube 62, and the fourth tube 63 have the same configuration as, for example, the first tube 60. The second tube 61 has one end 61a (the end located on the one end 60a side of the first tube 60 attached to the second tube 61) and the other end 61b. The second tube 61 is formed by spirally winding the base material 65a a plurality of times counterclockwise from the other end 61b toward one end 61a. The base material 65a is spirally wound a plurality of times counterclockwise around the central axis 61c of the second tube 61.

The winding end portion 66a (for example, the winding end portion) of the base material 64 at one end 60a of the first tube 60 is the first tube 60 when the first tube 60 is viewed from the one end 60a side in the axial direction of the first tube 60. On the surface of the first tube 60 with respect to the central axis of the first tube 60, where the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X axis in FIG. 5A) is 0 °. It is located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less. The winding end portion 66a may be, for example, a portion of the base material 64 located at one end 60a side. _{The position of the winding end portion 66a has an angle θ 111} with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The winding end portion 66a is a surface of the first tube 60 at one end 60a of the first tube 60 in the circumferential direction of the first tube 60 from between the first tube 60 and the second tube 61 on the base material 64. It is located at the tip of the extending portion 66b extending along the. The winding end portion 66a is fixed at a position in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the first tube 60. The side-by-side direction of the second tube 61 with respect to the first tube 60 is, for example, the arrangement direction of the central axis 61c of the second tube 61 with respect to the central axis 60c of the first tube 60.

In the active material holding member 50a, the winding end portion 66a is located in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the first tube 60, so that the extending portion is formed at one end 60a of the first tube 60. The length of 66b is shorter than the case where the winding end 66a is located in an angle range exceeding + 90 ° on the surface of the first tube 60. As a result, since the frequency of external stress being applied to the extending portion 66b is low, the base material 64 is less likely to fray starting from the winding end portion 66a, and thus leakage of the active material is suppressed.

The winding end portion 66a is preferably located in the following angle range with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The upper limit of the angle range is less than + 90 °, + 80 ° or less, + 70 ° or less, + 60 ° or less, from the viewpoint that the base material 64 is less likely to fray from the winding end 66a and the leakage of the active material is further suppressed. It is preferably + 50 ° or less, + 45 ° or less, + 40 ° or less, + 30 ° or less, + 20 ° or less, + 10 ° or less, or + 5 ° or less. The angular range may exceed 0 ° and may be 0 ° or + 90 °.

When the winding end portion 67a (for example, the winding start portion) of the base material 64 on the other end 60b of the first tube 60 is viewed from the other end 60b side in the axial direction of the first tube 60, the first tube 60 is viewed. , The direction in which the second tube 61 is attached to the first tube 60 (the positive direction of the X axis in FIG. 5B) is 0 °, and the first tube 60 is connected to the central axis of the first tube 60. It is preferably located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less on the surface. The winding end portion 67a may be, for example, a portion of the base material 64 located on the farthest end 60b side. _{The position of the winding end portion 67a has an angle θ 112} with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The winding end portion 67a is formed on the other end 60b of the first tube 60 from between the first tube 60 and the second tube 61 on the base material 64 in the circumferential direction of the first tube 60. It is located at the tip of the extending portion 67b extending along the surface. The winding end portion 67a is fixed at a position in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the first tube 60.

By locating the winding end portion 67a in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the first tube 60, the length of the extending portion 67b at the other end 60b of the first tube 60 is increased. It is shorter than the case where the winding end portion 67a is located in an angle range exceeding + 90 ° on the surface of the first tube 60. In this case, since the frequency of external stress being applied to the extending portion 67b is low, the base material 64 is unlikely to fray starting from the winding end portion 67a. Therefore, in the active material holding member 50a, the base material 64 is less likely to fray starting from the winding end portion 66a and the winding end portion 67a, so that the leakage of the active material is further suppressed.

The winding end portion 67a is preferably located in the following angle range with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The upper limit of the angle range is less than + 90 °, + 80 ° or less, + 70 ° or less, + 60 ° or less, from the viewpoint that the base material 64 is more difficult to fray from the winding end 67a and the leakage of the active material is further suppressed. It is preferably + 50 ° or less, + 45 ° or less, + 40 ° or less, + 30 ° or less, + 20 ° or less, + 10 ° or less, or + 5 ° or less. The angular range may exceed 0 ° and may be 0 ° or + 90 °.

The wound end portion 68a of the base material 65a at one end 61a of the second tube 61 is a second tube 60 with respect to the first tube 60 when the second tube 61 is viewed from the one end 61a side in the axial direction of the second tube 61. The side-by-side direction of the second tube 61 (the positive direction of the X-axis in FIG. 5A; the side-by-side direction of the third tube 62 with respect to the second tube 61) is 0 ° with respect to the central axis of the second tube 61. It is preferable that the tube 61 is located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less on the surface of the second tube 61. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 66a. The position of the winding end portion 68a is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 5 (a). The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _121a with respect to. The winding end portion 68a is a surface of the second tube 61 at one end 61a of the second tube 61 in the circumferential direction of the second tube 61 from between the second tube 61 and the third tube 62 on the base material 65a. It is located at the tip of the extending portion 68b extending along the. The winding end portion 68a is fixed at a position in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 61.

By locating the winding end portion 68a in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 61, the length of the extending portion 68b at one end 61a of the second tube 61 is increased. It is shorter than the case where the winding end portion 68a is located in an angle range exceeding + 90 ° on the surface of the tube 61 of 2. As a result, since the frequency of external stress being applied to the extending portion 68b is low, the base material 65a is less likely to fray starting from the winding end portion 68a. Therefore, in the active material holding member 50a, the base material 64 is less likely to fray from the winding end portion 66a, and the base material 65a is less likely to fray from the winding end portion 68a, so that leakage of the active material is further suppressed. To.

The wound end portion 69a of the base material 65a at the other end 61b of the second tube 61 is the first tube 60 when the second tube 61 is viewed from the other end 61b side in the axial direction of the second tube 61. The central axis of the second tube 61, where 0 ° is the side-by-side direction of the second tube 61 with respect to (the positive direction of the X-axis in FIG. 5B; the side-by-side direction of the third tube 62 with respect to the second tube 61). It is preferably located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less on the surface of the second tube 61. The preferred range of the angle range is the same as the above-mentioned angle range with respect to the winding end portion 67a. The position of the winding end portion 69a is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 5B. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _122a with respect to. At the other end 61b of the second tube 61, the winding end portion 69a is formed on the second tube 61 in the circumferential direction of the second tube 61 from between the second tube 61 and the third tube 62 on the base material 65a. It is located at the tip of the extending portion 69b extending along the surface. The winding end portion 69a is fixed at a position in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 61.

By locating the winding end portion 69a on the surface of the second tube 61 in the above-mentioned angle range of 0 ° or more and + 90 ° or less, the length of the extending portion 69b at the other end 61b of the second tube 61 is increased. It is shorter than the case where the winding end portion 69a is located in an angle range exceeding + 90 ° on the surface of the second tube 61. As a result, since the frequency of external stress being applied to the extending portion 69b is low, the base material 65a is less likely to fray starting from the winding end portion 69a. Therefore, in the active material holding member 50a, the base material 64 is hard to fray from the winding end portion 66a as the starting point, and the base material 65a is hard to fray from the winding end portion 69a as the starting point, so that the leakage of the active material is further suppressed. To.

An example of the active material holding member according to the second embodiment is the above-mentioned active material except that the base material 64 is formed by being spirally wound a plurality of times in a counterclockwise direction in the first tube 60. It is an active material holding member having the same structure as the holding member 50a. With such an active material holding member, it is possible to obtain the same effect as the active material holding member 50a, and a preferred embodiment is the same as that of the active material holding member 50a.

The active material holding member 50b shown in FIGS. 6 and 7 includes a first tube 70, a second tube 71, a third tube 72, and a fourth tube 73 that are adjacent to each other. The first tube 70 has one end 70a and the other end 70b. The first tube 70 is formed by spirally winding the base material 74 a plurality of times clockwise from the other end 70b toward one end 70a. The first tube 70 is formed, for example, by winding the base material 74 from the other end 70b to one end 70a of the first tube 70. The base material 74 is spirally wound a plurality of times clockwise around the central axis 70c of the first tube 70. In the first tube 70, for example, the base material having the first side and the second side facing each other is wound n + 1 times around the first side located on the other end 70b side at the time of the nth winding. It can be obtained by winding so that the second sides overlap at the time of turning. The cross section of the first tube 70 perpendicular to the axial direction of the first tube 70 is, for example, a perfect circle.

The second tube 71 is adjacent to the first tube 70. The third tube 72 is adjacent to the second tube 71. The fourth tube 73 is adjacent to the first tube 70 and is attached to the first tube 70 on the opposite side of the first tube 70 from the second tube 71. The second tube 71, the third tube 72, and the fourth tube 73 have the same configuration as, for example, the first tube 70. The second tube 71 has one end 71a (the end located on the one end 70a side of the first tube 70 attached to the second tube 71) and the other end 71b. The second tube 71 is formed by spirally winding the base material 75a a plurality of times clockwise from the other end 70b toward one end 70a. The base material 75a is spirally wound a plurality of times clockwise around the central axis 71c of the second tube 71.

The winding end portion 76a (for example, the winding end portion) of the base material 74 at one end 70a of the first tube 70 is the first tube 70 when the first tube 70 is viewed from the one end 70a side in the axial direction of the first tube 70. On the surface of the first tube 70 with respect to the central axis of the first tube 70, where the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X axis in FIG. 7A) is 0 °. It is located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less. The winding end portion 76a may be, for example, a portion of the base material 74 located at one end 70a side. _{The position of the winding end portion 76a has an angle θ 211} with respect to the side-by-side direction of the second tube 71 with respect to the first tube 70. The winding end portion 76a is a surface of the first tube 70 at one end 70a of the first tube 70 in the circumferential direction of the first tube 70 from between the first tube 70 and the second tube 71 on the base material 74. It is located at the tip of the extending portion 76b extending along the. The winding end portion 76a is fixed at a position in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the first tube 70. The side-by-side direction of the second tube 71 with respect to the first tube 70 is, for example, the arrangement direction of the central axis 71c of the second tube 71 with respect to the central axis 70c of the first tube 70.

In the active material holding member 50b, the winding end portion 76a extends at one end 70a of the first tube 70 by being located in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the first tube 70. The length of the portion 76b is shorter than the case where the winding end portion 76a is located in an angle range of less than −90 ° on the surface of the first tube 70. As a result, since the frequency of external stress being applied to the extending portion 76b is low, the base material 74 is unlikely to fray starting from the winding end portion 76a, and thus leakage of the active material is suppressed.

The winding end portion 76a is preferably located in the following angle range with respect to the side-by-side direction of the second tube 71 with respect to the first tube 70. The upper limit of the angle range is more than -90 °, -80 ° or more, -70 ° or more, from the viewpoint that the base material 74 is more difficult to fray from the winding end 76a and the leakage of the active material is further suppressed. -60 ° or higher, −50 ° or higher, −45 ° or higher, −40 ° or higher, −30 ° or higher, −20 ° or higher, −10 ° or higher, or −5 ° or higher is preferable. The angular range may be less than 0 ° and may be 0 ° or −90 °.

When the winding end portion 77a (for example, the winding start portion) of the base material 74 on the other end 70b of the first tube 70 is viewed from the other end 70b side in the axial direction of the first tube 70, the first tube 70 is viewed. , The direction in which the second tube 71 is juxtaposed with respect to the first tube 70 (the positive direction of the X axis in FIG. 7B) is 0 °, and the first tube 70 with respect to the central axis of the first tube 70. It is preferably located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less on the surface. The winding end portion 77a may be, for example, a portion of the base material 74 located on the farthest end 70b side. _{The position of the winding end portion 77a has an angle θ 212} with respect to the side-by-side direction of the second tube 71 with respect to the first tube 70. The winding end portion 77a is formed on the other end 70b of the first tube 70 from between the first tube 70 and the second tube 71 on the base material 74 in the circumferential direction of the first tube 70. It is located at the tip of the extending portion 77b extending along the surface. The winding end portion 77a is fixed at a position in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the first tube 70.

By locating the winding end portion 77a in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the first tube 70, the length of the extending portion 77b at the other end 70b of the first tube 70 becomes longer. , Shorter than the case where the winding end 77a is located in an angle range below −90 ° on the surface of the first tube 70. As a result, since the frequency of external stress being applied to the extending portion 77b is low, the base material 74 is less likely to fray starting from the winding end portion 77a. Therefore, in the active material holding member 50b, the base material 74 is unlikely to fray starting from the winding end portion 76a and the winding end portion 77a, so that the leakage of the active material is further suppressed.

The winding end portion 77a is preferably located in the following angle range with respect to the side-by-side direction of the second tube 71 with respect to the first tube 70. The upper limit of the angle range is more than -90 °, -80 ° or more, -70 ° or more, from the viewpoint that the base material 74 is more difficult to fray from the winding end 77a and the leakage of the active material is further suppressed. -60 ° or higher, −50 ° or higher, −45 ° or higher, −40 ° or higher, −30 ° or higher, −20 ° or higher, −10 ° or higher, or −5 ° or higher is preferable. The angular range may be less than 0 ° and may be 0 ° or −90 °.

The wound end portion 78a of the base material 75a at one end 71a of the second tube 71 is a second tube 70 with respect to the first tube 70 when the second tube 71 is viewed from the one end 71a side in the axial direction of the second tube 71. With respect to the central axis of the second tube 71, the side-by-side direction of the second tube 71 (the positive direction of the X-axis in FIG. 7 (a). It is preferable that the tube 71 is located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less on the surface of the second tube 71. The preferred range of the angle range is the same as the above-mentioned angle range with respect to the winding end portion 76a. The winding end 78a is a surface of the second tube 71 at one end 71a of the second tube 71 in the circumferential direction of the second tube 71 from between the second tube 71 and the third tube 72 on the base material 75a. It is located at the tip of the extending portion 78b extending along the. The winding end portion 78a is fixed at a position in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the second tube 71.

By locating the winding end portion 78a in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the second tube 71, the length of the extending portion 78b at one end 71a of the second tube 71 is increased. It is shorter than the case where the winding end 78a is located in the angle range below −90 ° on the surface of the second tube 71. As a result, since the frequency of external stress being applied to the extending portion 78b is low, the base material 75a is less likely to fray starting from the winding end portion 78a. Therefore, in the active material holding member 50b, the base material 74 is hard to fray from the winding end portion 76a as the starting point, and the base material 75a is hard to fray from the winding end portion 78a, so that the leakage of the active material is further suppressed. To.

The wound end portion 79a of the base material 75a on the other end 71b of the second tube 71 is the first tube 70 when the second tube 71 is viewed from the other end 71b side in the axial direction of the second tube 71. The central axis of the second tube 71, where 0 ° is the side-by-side direction of the second tube 71 with respect to (the positive direction of the X-axis in FIG. 7B; the side-by-side direction of the third tube 62 with respect to the second tube 61). It is preferably located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less on the surface of the second tube 71. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 77a. At the other end 71b of the second tube 71, the winding end portion 79a is formed on the second tube 71 in the circumferential direction of the second tube 71 from between the second tube 71 and the third tube 72 on the base material 75a. It is located at the tip of the extending portion 79b extending along the surface. The winding end portion 79a is fixed at a position in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the second tube 71.

By locating the winding end portion 79a on the surface of the second tube 71 in the above-mentioned angle range of −90 ° or more and 0 ° or less, the length of the extending portion 79b at the other end 71b of the second tube 71 becomes longer. , It is shorter than the case where the winding end portion 79a is located in the angle range below −90 ° on the surface of the second tube 71. As a result, since the frequency of external stress being applied to the extending portion 79b is low, the base material 75a is less likely to fray starting from the winding end portion 79a. Therefore, in the active material holding member 50b, the base material 74 is hard to fray from the winding end portion 76a as the starting point, and the base material 75a is hard to fray from the winding end portion 79a as the starting point, so that the leakage of the active material is further suppressed. To.

An example of the active material holding member according to the fourth embodiment is described above, except that the base material 74 is formed by being spirally wound a plurality of times in a clockwise direction in the first tube 70. It is an active material holding member having the same structure as the member 50b. With such an active material holding member, it is possible to obtain the same effect as the active material holding member 50b, and a preferred embodiment is the same as that of the active material holding member 50b.

The mode of the active material holding member is not limited to the above-mentioned mode, and various modified modes are possible. For example, the configuration (winding direction of the base material, the position of the winding end, etc.) of the tubes other than the first tube (for example, the second tube) may be the same as or different from the configuration of the first tube. May be good.

The active material holding member and the electrode having the active material holding member are preferably used in a liquid lead-acid battery (active material holding member and electrode for a liquid lead-acid battery), and the lead-acid battery is a liquid lead-acid battery. Is preferable. Generally, in a liquid-type lead-acid battery, the entire electrode tends to be immersed in the electrolytic solution, and the amount of the electrolytic solution tends to be larger than that of a control valve type lead-acid battery or the like. In this case, since the discharge capacity is not easily regulated by the amount of the electrolytic solution, the discharge capacity tends to be increased. However, in a liquid lead-acid battery, the stratification of the electrolytic solution increases the concentration of sulfuric acid in the region below the electrode, and the base material below the tube in the electrode tends to deteriorate. Further, in a liquid lead-acid battery, as the deterioration over time (including deterioration due to the charge / discharge cycle) progresses, the active material (for example, the positive electrode active material) becomes muddy, and the active material easily leaks out. Become. If the base material of the tube is frayed in these states, the active material leaks significantly. On the other hand, in the active material holding member according to each of the above-described embodiments and the modified embodiments thereof, since the base material is unlikely to fray from the winding end, the advantages of the liquid lead-acid battery should be utilized while suppressing the leakage of the active material. Can be done.

The active material holding member may be in the mode shown in FIGS. 8 to 11. 8 to 11 are schematic plan views of the active material holding member when viewed from the axial direction of the tube. In FIGS. 8 to 11, for convenience, the thickness of the base material constituting the tube is not shown. Although only four tubes are shown in FIGS. 8 to 11 for convenience, the active material holding member may include five or more tubes.

The active material holding members 50c to 50e shown in FIGS. 8 and 9 are the same as the active material holding members 50a shown in FIG. 5, except that the configuration of the second tube 61 is different.

In the active material holding member 50c shown in FIGS. 8A and 9A, the second tube 61 is located at one end 61a (one end 60a side of the first tube 60 attached to the second tube 61). It has an end) and the other end 61b. The second tube 61 is formed by spirally winding the base material 65b a plurality of times counterclockwise from the other end 61b toward one end 61a. The base material 65b is spirally wound a plurality of times counterclockwise around the central axis 61c of the second tube 61.

As shown in FIG. 8A, the winding end portion 68c of the base material 65b at one end 61a of the second tube 61 saw the second tube 61 from the one end 61a side in the axial direction of the second tube 61. Occasionally, the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 8A; the side-by-side direction of the third tube 62 with respect to the second tube 61) is set to 0 °. It is preferably located in an angle range (π to 3π / 2 radians) of −180 ° or more and −90 ° or less on the surface of the second tube 61 with respect to the central axis of the second tube 61. The position of the winding end portion 68c is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 8A. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _121b with respect to. The winding end portion 68c is a surface of the second tube 61 at one end 61a of the second tube 61 in the circumferential direction of the second tube 61 from between the first tube 60 and the second tube 61 on the base material 65b. It is located at the tip of the extending portion 68d extending along the. The winding end portion 68c is fixed at a position in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 61.

Since the winding end portion 68c is located in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 61, the length of the extending portion 68d at one end 61a of the second tube 61 becomes longer. , It is shorter than the case where the winding end portion 68c is located in an angle range exceeding −90 ° on the surface of the second tube 61. As a result, since the frequency of external stress being applied to the extending portion 68d is low, the base material 65b is less likely to fray starting from the winding end portion 68c. Therefore, in the active material holding member 50c, the base material 64 is less likely to fray from the winding end portion 66a, and the base material 65b is less likely to fray from the winding end portion 68c, so that leakage of the active material is further suppressed. To.

The winding end portion 68c is preferably located in the following angle range with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The upper limit of the angle range is less than -90 °, -100 ° or less, -110 ° or less, and-from the viewpoint that the base material 65b is more difficult to fray starting from the winding end 68c and the leakage of the active material is further suppressed. It is preferably 120 ° or less, -130 ° or less, -135 ° or less, -140 ° or less, -150 ° or less, -160 ° or less, -170 ° or less, or -175 ° or less. The angular range may exceed −180 ° and may be −180 ° or −90 °.

As shown in FIG. 9A, the winding end portion 69c of the base material 65b at the other end 61b of the second tube 61 is a second tube 61 from the other end 61b side in the axial direction of the second tube 61. When viewed, the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 9A; the side-by-side direction of the third tube 62 with respect to the second tube 61) is 0 °. Therefore, it is preferable to be located in an angle range (π to 3π / 2 radians) of −180 ° or more and −90 ° or less on the surface of the second tube 61 with respect to the central axis of the second tube 61. The position of the winding end portion 69c is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 9A. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _122b with respect to. At the other end 61b of the second tube 61, the winding end portion 69c is formed of the second tube 61 in the circumferential direction of the second tube 61 from between the first tube 60 and the second tube 61 on the base material 65b. It is located at the tip of the extending portion 69d extending along the surface. The winding end portion 69c is fixed at a position in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 61.

By locating the winding end portion 69c in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 61, the length of the extending portion 69d at the other end 61b of the second tube 61 However, it is shorter than the case where the winding end portion 69c is located in an angle range exceeding −90 ° on the surface of the second tube 61. As a result, since the frequency of external stress being applied to the extending portion 69d is low, the base material 65b is less likely to fray starting from the winding end portion 69c. Therefore, in the active material holding member 50c, the base material 64 is less likely to fray from the winding end portion 66a, and the base material 65b is less likely to fray from the winding end portion 69c, so that leakage of the active material is further suppressed. To.

The winding end portion 69c is preferably located in the following angle range with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The upper limit of the angle range is less than -90 °, -100 ° or less, -110 ° or less, and-from the viewpoint that the base material 65b is more difficult to fray starting from the winding end 69c and the leakage of the active material is further suppressed. It is preferably 120 ° or less, -130 ° or less, -135 ° or less, -140 ° or less, -150 ° or less, -160 ° or less, -170 ° or less, or -175 ° or less. The angular range may exceed −180 ° and may be −180 ° or −90 °.

In the active material holding member 50d shown in FIGS. 8 (b) and 9 (b), the second tube 61 is located at one end 61a (one end 60a side of the first tube 60 attached to the second tube 61). It has an end) and the other end 61b. The second tube 61 is formed by spirally winding the base material 65c a plurality of times clockwise from the other end 61b toward one end 61a. The base material 65c is spirally wound a plurality of times clockwise around the central axis 61c of the second tube 61.

As shown in FIG. 8B, the winding end portion 68e of the base material 65c at one end 61a of the second tube 61 saw the second tube 61 from the one end 61a side in the axial direction of the second tube 61. Occasionally, the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 8B; the side-by-side direction of the third tube 62 with respect to the second tube 61) is set to 0 °. It is preferably located in an angle range (π / 2 to π radians) of + 90 ° or more and + 180 ° or less on the surface of the second tube 61 with respect to the central axis of the second tube 61. The position of the winding end portion 68e is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 8B. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _121c with respect to. The winding end portion 68e is a surface of the second tube 61 at one end 61a of the second tube 61 in the circumferential direction of the second tube 61 from between the first tube 60 and the second tube 61 on the base material 65c. It is located at the tip of the extending portion 68f extending along the. The winding end portion 68e is fixed at a position in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 61.

By locating the winding end portion 68e in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 61, the length of the extending portion 68f at one end 61a of the second tube 61 becomes the second. It is shorter than the case where the winding end portion 68e is located in the angle range below + 90 ° on the surface of the tube 61 of 2. As a result, since the frequency of external stress being applied to the extending portion 68f is low, the base material 65c is less likely to fray starting from the winding end portion 68e. Therefore, in the active material holding member 50d, the base material 64 is hard to fray from the winding end portion 66a as the starting point, and the base material 65c is hard to fray from the winding end portion 68e, so that the leakage of the active material is further suppressed. To.

The winding end portion 68e is preferably located in the following angle range with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The upper limit of the angle range is more than + 90 °, + 100 ° or more, + 110 ° or more, + 120 ° or more from the viewpoint that the base material 65c is more difficult to fray starting from the winding end portion 68e and the leakage of the active material is further suppressed. , + 130 ° or more, + 135 ° or more, + 140 ° or more, + 150 ° or more, + 160 ° or more, + 170 ° or more, or + 175 ° or more are preferable. The angular range may be less than + 180 ° and may be + 90 ° or + 180 °.

As shown in FIG. 9B, the winding end portion 69e of the base material 65c at the other end 61b of the second tube 61 connects the second tube 61 from the other end 61b side in the axial direction of the second tube 61. When viewed, the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 9B; the side-by-side direction of the third tube 62 with respect to the second tube 61) is 0 °. As a result, it is preferable that the second tube 61 is located in an angle range (π / 2 to π radians) of + 90 ° or more and + 180 ° or less on the surface of the second tube 61 with respect to the central axis. The position of the winding end portion 69e is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 9B. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _122c with respect to. At the other end 61b of the second tube 61, the winding end portion 69e is formed of the second tube 61 in the circumferential direction of the second tube 61 from between the first tube 60 and the second tube 61 in the base material 65c. It is located at the tip of the extending portion 69f extending along the surface. The winding end portion 69e is fixed at a position in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 61.

By locating the winding end portion 69e in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 61, the length of the extending portion 69f at the other end 61b of the second tube 61 is increased. It is shorter than the case where the winding end portion 69e is located in the angle range below + 90 ° on the surface of the second tube 61. As a result, since the frequency of external stress being applied to the extending portion 69f is low, the base material 65c is less likely to fray starting from the winding end portion 69e. Therefore, in the active material holding member 50d, the base material 64 is less likely to fray from the winding end portion 66a, and the base material 65c is less likely to fray from the winding end portion 69e, so that leakage of the active material is further suppressed. To.

The winding end portion 69e is preferably located in the following angle range with respect to the side-by-side direction of the second tube 61 with respect to the first tube 60. The upper limit of the angle range is more than + 90 °, + 100 ° or more, + 110 ° or more, + 120 ° or more from the viewpoint that the base material 65c is more difficult to fray starting from the winding end portion 69e and the leakage of the active material is further suppressed. , + 130 ° or more, + 135 ° or more, + 140 ° or more, + 150 ° or more, + 160 ° or more, + 170 ° or more, or + 175 ° or more are preferable. The angular range may be less than + 180 ° and may be + 90 ° or + 180 °.

In the active material holding member 50e shown in FIGS. 8 (c) and 9 (c), the second tube 61 is located at one end 61a (one end 60a side of the first tube 60 attached to the second tube 61). It has an end) and the other end 61b. The second tube 61 is formed by spirally winding the base material 65d a plurality of times clockwise from the other end 61b toward one end 61a. The base material 65d is spirally wound a plurality of times clockwise around the central axis 61c of the second tube 61.

As shown in FIG. 8C, the wound end portion 68 g of the base material 65d at one end 61a of the second tube 61 saw the second tube 61 from the one end 61a side in the axial direction of the second tube 61. Occasionally, the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 8C; the side-by-side direction of the third tube 62 with respect to the second tube 61) is set to 0 °. It is preferably located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less on the surface of the second tube 61 with respect to the central axis of the second tube 61. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 77a. The position of the winding end portion 68 g is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 8C. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _121d with respect to. At one end 61a of the second tube 61, the winding end portion 68g is a surface of the second tube 61 in the circumferential direction of the second tube 61 from between the second tube 61 and the third tube 62 on the base material 65d. It is located at the tip of the extending portion 68h extending along the line. The winding end portion 68 g is fixed at a position in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the second tube 61.

By locating the winding end portion 68g on the surface of the second tube 61 in the above-mentioned angle range of −90 ° or more and 0 ° or less, the length of the extending portion 68h at one end 61a of the second tube 61 is increased. It is shorter than the case where the winding end portion 68 g is located in the angle range below −90 ° on the surface of the second tube 61. As a result, since the frequency of external stress being applied to the extending portion 68h is low, the base material 65d is less likely to fray starting from the winding end portion 68g. Therefore, in the active material holding member 50e, the base material 64 is less likely to fray from the winding end portion 66a, and the base material 65d is less likely to fray from the winding end portion 68g, so that leakage of the active material is further suppressed. To.

As shown in FIG. 9C, the winding end portion 69g of the base material 65d at the other end 61b of the second tube 61 is a second tube 61 from the other end 61b side in the axial direction of the second tube 61. When viewed, the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 9C; the side-by-side direction of the third tube 62 with respect to the second tube 61) is 0 °. Therefore, it is preferable to be located in an angle range (3π / 2 to 2π radians) of −90 ° or more and 0 ° or less on the surface of the second tube 61 with respect to the central axis of the second tube 61. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 77a. The position of the winding end portion 69g is the side-by-side direction of the second tube 61 with respect to the first tube 60 (the positive direction of the X-axis in FIG. 9C. The side-by-side direction of the third tube 62 with respect to the second tube 61). It has an angle θ _122d with respect to. At the other end 61b of the second tube 61, the winding end portion 69g is formed on the second tube 61 in the circumferential direction of the second tube 61 from between the second tube 61 and the third tube 62 on the base material 65d. It is located at the tip of the extending portion 69h extending along the surface. The winding end portion 69 g is fixed at a position in the above-mentioned angle range of −90 ° or more and 0 ° or less on the surface of the second tube 61.

By locating the winding end portion 69g on the surface of the second tube 61 in the above-mentioned angle range of −90 ° or more and 0 ° or less, the length of the extending portion 69h at the other end 61b of the second tube 61 becomes longer. , It is shorter than the case where the winding end portion 69g is located in the angle range below −90 ° on the surface of the second tube 61. As a result, since the frequency of external stress being applied to the extending portion 69h is low, the base material 65d is less likely to fray starting from the winding end portion 69g. Therefore, in the active material holding member 50e, the base material 64 is less likely to fray from the winding end 66a as the starting point, and the base material 65d is less likely to fray starting from the winding end 69g, so that the leakage of the active material is further suppressed. To.

The active material holding members 50f to 50h shown in FIGS. 10 and 11 are the same as the active material holding member 50b shown in FIG. 7, except that the configuration of the second tube 71 is different.

In the active material holding member 50f shown in FIGS. 10A and 11A, the second tube 71 is located at one end 71a (one end 70a side of the first tube 70 attached to the second tube 71). It has an end) and the other end 71b. The second tube 71 is formed by spirally winding the base material 75b a plurality of times clockwise from the other end 71b toward one end 71a. The base material 75b is spirally wound a plurality of times clockwise around the central axis 71c of the second tube 71.

As shown in FIG. 10A, the winding end portion 78c of the base material 75b at one end 71a of the second tube 71 saw the second tube 71 from the one end 71a side in the axial direction of the second tube 71. Occasionally, the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 10A; the side-by-side direction of the third tube 72 with respect to the second tube 71) is set to 0 °. It is preferably located in an angle range (π / 2 to π radians) of + 90 ° or more and + 180 ° or less on the surface of the second tube 71 with respect to the central axis of the second tube 71. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 68e. The position of the winding end 78c is the direction in which the second tube 71 is attached to the first tube 70 (the positive direction of the X-axis in FIG. 10 (a). The direction in which the third tube 72 is attached to the second tube 71). It has an angle θ _221b with respect to. The winding end 78c is a surface of the second tube 71 at one end 71a of the second tube 71 in the circumferential direction of the second tube 71 from between the first tube 70 and the second tube 71 on the base material 75b. It is located at the tip of the extending portion 78d extending along the. The winding end 78c is fixed at a position on the surface of the second tube 71 in the above-mentioned angle range of + 90 ° or more and + 180 ° or less.

Since the winding end portion 78c is located in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 71, the length of the extending portion 78d at one end 71a of the second tube 71 is increased. It is shorter than the case where the winding end 78c is located in the angle range below + 90 ° on the surface of the tube 71 of 2. As a result, since the frequency of external stress being applied to the extending portion 78d is low, the base material 75b is less likely to fray starting from the winding end portion 78c. Therefore, in the active material holding member 50f, the base material 74 is hard to fray starting from the winding end portion 76a, and the base material 75b is hard to fray starting from the winding end portion 78c, so that the leakage of the active material is further suppressed. To.

As shown in FIG. 11A, the winding end portion 79c of the base material 75b at the other end 71b of the second tube 71 is a second tube 71 from the other end 71b side in the axial direction of the second tube 71. When viewed, the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 11A; the side-by-side direction of the third tube 72 with respect to the second tube 71) is 0 °. Therefore, it is preferably located in an angle range (π / 2 to π radians) of + 90 ° or more and + 180 ° or less on the surface of the second tube 71 with respect to the central axis of the second tube 71. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 69e. The position of the winding end portion 79c is the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 11A. The side-by-side direction of the third tube 72 with respect to the second tube 71). It has an angle θ _222b with respect to. At the other end 71b of the second tube 71, the winding end portion 79c is formed on the second tube 71 in the circumferential direction of the second tube 71 from between the first tube 70 and the second tube 71 on the base material 75b. It is located at the tip of the extending portion 79d extending along the surface. The winding end portion 79c is fixed at a position in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 71.

By locating the winding end portion 79c in the above-mentioned angle range of + 90 ° or more and + 180 ° or less on the surface of the second tube 71, the length of the extending portion 79d at the other end 71b of the second tube 71 is increased. It is shorter than the case where the winding end portion 79c is located in the angle range below + 90 ° on the surface of the second tube 71. As a result, since the frequency of external stress being applied to the extending portion 79d is low, the base material 75b is less likely to fray starting from the winding end portion 79c. Therefore, in the active material holding member 50f, the base material 74 is hard to fray starting from the winding end portion 76a, and the base material 75b is hard to fray starting from the winding end portion 79c, so that the leakage of the active material is further suppressed. To.

In the active material holding member 50g shown in FIGS. 10B and 11B, the second tube 71 is located at one end 71a (one end 70a side of the first tube 70 attached to the second tube 71). It has an end) and the other end 71b. The second tube 71 is formed by spirally winding the base material 75c a plurality of times counterclockwise from the other end 71b toward one end 71a. The base material 75c is spirally wound a plurality of times counterclockwise around the central axis 71c of the second tube 71.

As shown in FIG. 10B, the winding end portion 78e of the base material 75c at one end 71a of the second tube 71 saw the second tube 71 from the one end 71a side in the axial direction of the second tube 71. Occasionally, the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 10B; the side-by-side direction of the third tube 72 with respect to the second tube 71) is set to 0 °. It is preferably located in an angle range (π to 3π / 2 radians) of −180 ° or more and −90 ° or less on the surface of the second tube 71 with respect to the central axis of the second tube 71. The preferred range of the angle range is the same as the above-mentioned angle range with respect to the winding end portion 68c. The position of the winding end portion 78e is the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 10B. The side-by-side direction of the third tube 72 with respect to the second tube 71). It has an angle θ _221c with respect to. The winding end 78e is a surface of the second tube 71 at one end 71a of the second tube 71 in the circumferential direction of the second tube 71 from between the first tube 70 and the second tube 71 in the base material 75c. It is located at the tip of the extending portion 78f extending along the line. The winding end 78e is fixed at a position on the surface of the second tube 71 in the above-mentioned angle range of −180 ° or more and −90 ° or less.

By locating the winding end portion 78e in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 71, the length of the extending portion 78f at one end 71a of the second tube 71 becomes longer. , The winding end 78e is shorter than the case where the winding end 78e is located in an angle range exceeding −90 ° on the surface of the second tube 71. As a result, since the frequency of external stress being applied to the extending portion 78f is low, the base material 75c is less likely to fray starting from the winding end portion 78e. Therefore, in the active material holding member 50g, the base material 74 is hard to fray from the winding end portion 76a as the starting point, and the base material 75c is hard to fray from the winding end portion 78e, so that the leakage of the active material is further suppressed. To.

As shown in FIG. 11B, the winding end portion 79e of the base material 75c at the other end 71b of the second tube 71 connects the second tube 71 from the other end 71b side in the axial direction of the second tube 71. When viewed, the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 11B; the side-by-side direction of the third tube 72 with respect to the second tube 71) is 0 °. Therefore, it is preferable to be located in an angle range (π to 3π / 2 radians) of −180 ° or more and −90 ° or less on the surface of the second tube 71 with respect to the central axis of the second tube 71. The preferred range of the angle range is the same as the above-mentioned angle range with respect to the winding end portion 69c. The position of the winding end portion 79e is the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 11B. The side-by-side direction of the third tube 72 with respect to the second tube 71). It has an angle θ _222c with respect to. At the other end 71b of the second tube 71, the winding end portion 79e is formed of the second tube 71 in the circumferential direction of the second tube 71 from between the first tube 70 and the second tube 71 in the base material 75c. It is located at the tip of the extending portion 79f extending along the surface. The winding end portion 79e is fixed at a position in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 71.

By locating the winding end portion 79e in the above-mentioned angle range of −180 ° or more and −90 ° or less on the surface of the second tube 71, the length of the extending portion 79f at the other end 71b of the second tube 71 However, it is shorter than the case where the winding end portion 79e is located in an angle range exceeding −90 ° on the surface of the second tube 71. As a result, since the frequency of external stress being applied to the extending portion 79f is low, the base material 75c is less likely to fray starting from the winding end portion 79e. Therefore, in the active material holding member 50g, the base material 74 is hard to fray from the winding end portion 76a as the starting point, and the base material 75c is hard to fray from the winding end portion 79e, so that the leakage of the active material is further suppressed. To.

In the active material holding member 50h shown in FIGS. 10 (c) and 11 (c), the second tube 71 is located at one end 71a (one end 70a side of the first tube 70 attached to the second tube 71). It has an end) and the other end 71b. The second tube 71 is formed by spirally winding the base material 75d a plurality of times counterclockwise from the other end 71b toward one end 71a. The base material 75d is spirally wound a plurality of times counterclockwise around the central axis 71c of the second tube 71.

As shown in FIG. 10C, the winding end portion 78g of the base material 75d at one end 71a of the second tube 71 saw the second tube 71 from the one end 71a side in the axial direction of the second tube 71. Occasionally, the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 10C; the side-by-side direction of the third tube 72 with respect to the second tube 71) is set to 0 °. It is preferably located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less on the surface of the second tube 71 with respect to the central axis of the second tube 71. The preferable range of the angle range is the same as the angle range described above with respect to the winding end portion 66a. The position of the winding end portion 78g is the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 10C. The side-by-side direction of the third tube 72 with respect to the second tube 71). It has an angle θ _221d with respect to. At one end 71a of the second tube 71, the winding end portion 78g is formed on the surface of the second tube 71 in the circumferential direction of the second tube 71 from between the second tube 71 and the third tube 72 on the base material 75d. It is located at the tip of the extending portion 78h extending along the line. The winding end portion 78 g is fixed at a position in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 71.

By locating the winding end portion 78g in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 71, the length of the extending portion 78h at one end 71a of the second tube 71 becomes the second. It is shorter than the case where the winding end portion 78g is located in an angle range exceeding + 90 ° on the surface of the tube 71 of 2. As a result, since the frequency of external stress being applied to the extending portion 78h is low, the base material 75d is less likely to fray starting from the winding end portion 78g. Therefore, in the active material holding member 50h, the base material 74 is hard to fray starting from the winding end portion 76a, and the base material 75d is hard to fray starting from the winding end portion 78g, so that the leakage of the active material is further suppressed. To.

As shown in FIG. 11C, the winding end portion 79g of the base material 75d at the other end 71b of the second tube 71 is a second tube 71 from the other end 71b side in the axial direction of the second tube 71. When viewed, the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 11C; the side-by-side direction of the third tube 72 with respect to the second tube 71) is 0 °. Therefore, it is preferably located in an angle range (0 to π / 2 radians) of 0 ° or more and + 90 ° or less on the surface of the second tube 71 with respect to the central axis of the second tube 71. The preferred range of the angle range is the same as the above-mentioned angle range with respect to the winding end portion 67a. The position of the winding end portion 79g is the side-by-side direction of the second tube 71 with respect to the first tube 70 (the positive direction of the X-axis in FIG. 11C. The side-by-side direction of the third tube 72 with respect to the second tube 71). It has an angle θ _222d with respect to. At the other end 71b of the second tube 71, the winding end portion 79g is formed on the second tube 71 in the circumferential direction of the second tube 71 from between the second tube 71 and the third tube 72 on the base material 75d. It is located at the tip of the extending portion 79h extending along the surface. The winding end portion 79 g is fixed at a position in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 71.

By locating the winding end portion 79g in the above-mentioned angle range of 0 ° or more and + 90 ° or less on the surface of the second tube 71, the length of the extending portion 79h at the other end 71b of the second tube 71 is increased. It is shorter than the case where the winding end portion 79 g is located in an angle range exceeding + 90 ° on the surface of the second tube 71. As a result, since the frequency of external stress being applied to the extending portion 79h is low, the base material 75d is less likely to fray starting from the winding end portion 79g. Therefore, in the active material holding member 50h, the base material 74 is hard to fray starting from the winding end portion 76a, and the base material 75d is hard to fray starting from the winding end portion 79g, so that the leakage of the active material is further suppressed. To.

The cross section of the tube perpendicular to the axial direction of the tube may be a perfect circle as in the above-described embodiment, or may be an ellipse or the like. As the central axis of the tube, the center of gravity in the cross section of the tube may be used.

In the active material holding member according to the present embodiment, the base material may include a non-woven fabric, a woven fabric, and the like, and includes, for example, a non-woven fabric. The base material can contain a resin material. Examples of the resin material include polyester (for example, polyalkylene terephthalate such as polyethylene terephthalate), polyolefin (polyethylene, polypropylene, etc.), polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, polycarbonate and the like. The base material can contain, for example, polyester, and can include a non-woven fabric containing polyester.

If the base material contains fibers, the fibers may be oriented. For example, the non-woven fabric may have an MD direction (mechanical direction) in manufacturing the non-woven fabric and a CD direction (width direction) orthogonal to the MD direction. Since the fibers are easily oriented in the MD direction, the MD direction tends to have higher mechanical strength than the CD direction. Therefore, a resin sheet having high mechanical strength in the CD direction is a sheet having high mechanical strength even in a direction in which the mechanical strength is relatively low (CD direction). When the base material contains a non-woven fabric, at least one tube (for example, the first tube and the first tube) in the active material holding member is easily suppressed from the viewpoint that the influence of mechanical strength due to the fiber orientation is easily suppressed and the leakage of the active material is easily suppressed. In at least one selected from the group consisting of the second tube), it is preferable that the MD direction and the CD direction of the non-woven fabric are inclined with respect to the axial direction of the tube. The inclination angle in the MD direction or the CD direction with respect to the axial direction of the tube is preferably in the following range from the viewpoint that the influence of the mechanical strength due to the fiber orientation is easily suppressed and the leakage of the active material is easily suppressed. The inclination angle is preferably more than 0 °, more preferably 10 ° or more, further preferably 20 ° or more, particularly preferably 30 ° or more, extremely preferably 40 ° or more, and very preferably 43 ° or more. The inclination angle is preferably less than 90 °, more preferably 80 ° or less, further preferably 70 ° or less, particularly preferably 60 ° or less, extremely preferably 50 ° or less, and very preferably 47 ° or less. From these viewpoints, the inclination angle is preferably more than 0 ° and less than 90 °, more preferably 10 to 80 °, still more preferably 43 to 47 °. When the inclination angle is 45 °, it is presumed that the influence of mechanical strength due to fiber orientation is most easily suppressed.

The base material may be a porous body having pores. The base material preferably includes a portion having an average pore diameter in the following range. The average pore diameter of the base material is preferably 60 μm or less, more preferably 50 μm or less, further preferably 45 μm or less, and particularly preferably 40 μm or less, from the viewpoint of easily suppressing the outflow of the electrode material. The average pore diameter of the base material is preferably more than 2 μm, more preferably 5 μm or more, further preferably 10 μm or more, particularly preferably 20 μm or more, extremely preferably 30 μm or more, and 35 μm or more from the viewpoint of easily reducing electrical resistance. Is very preferable. From these viewpoints, the average pore diameter of the base material is preferably more than 2 μm and 60 μm or less. The average pore diameter can be measured with a pore distribution measuring device (for example, AUTO PORE IV 9520 manufactured by Shimadzu Corporation).

At least one tube (for example, at least one selected from the group consisting of a first tube and a second tube) in the active material holding member has a thickness in the following range (wall thickness. Thickness of the wall portion constituting the tube). It may be provided with a portion having (the same applies hereinafter). The thickness of the tube may be in the following range. The thickness of the tube may be 0.05 mm or more, 0.1 mm or more, or 0.2 mm or more. The thickness of the tube may be 1 mm or less, 0.8 mm or less, 0.6 mm or less, or 0.4 mm or less. From these viewpoints, the thickness of the tube may be 0.05 to 1 mm.

The length of at least one tube (for example, at least one selected from the group consisting of the first tube and the second tube) in the active material holding member may be in the following range. The length of the tube may be 50 mm or more, 100 mm or more, 120 mm or more, 160 mm or more, or 200 mm or more. The length of the tube may be 800 mm or less, 750 mm or less, 700 mm or less, 650 mm or less, 600 mm or less, or 580 mm or less. From these points of view, the length of the tube may be 50-800 mm.

The method for manufacturing a lead-acid battery according to the present embodiment includes an assembly step of assembling a component including an electrode having an active material holding member to obtain a lead-acid battery. In the assembling step, for example, a non-chemical positive electrode and a non-chemical negative electrode are laminated, and the current collecting portions of electrodes having the same polarity are welded with a strap to obtain an electrode group. This group of electrodes is arranged in the battery case to produce an unchemical battery. The unchemical positive electrode and the unchemical negative electrode may be laminated via a separator.

The lead-acid battery manufacturing method according to the present embodiment may include an active material holding member manufacturing step for manufacturing an active material holding member before the assembling step. The active material holding member manufacturing process includes a process of forming a tube by spirally winding a base material counterclockwise or clockwise, and a process of arranging a plurality of tubes in a direction orthogonal to the axial direction of the tube. May have.

The lead-acid battery manufacturing method according to the present embodiment may include an electrode manufacturing step of manufacturing an electrode having an active material holding member. The electrode manufacturing step includes a positive electrode manufacturing step and a negative electrode manufacturing step. Hereinafter, a case where the positive electrode has an active material holding member will be described.

In the positive electrode manufacturing step, a positive electrode having a core metal inserted in the tube of the active material holding member and a positive electrode material filled between the tube and the core metal is obtained. In the positive electrode manufacturing step, for example, after arranging the core metal in the tube, a raw material for the positive electrode active material or the like is filled between the core metal and the tube, and the lower end of the tube is closed with a lower joint to form a non-chemical electrode. A positive electrode having the above positive electrode material can be obtained. In the positive electrode manufacturing step, the upper end of the tube may be closed with an upper joint.

In the negative electrode manufacturing step, for example, a negative electrode material paste containing a raw material for a negative electrode active material is filled in a negative electrode current collector (for example, a current collector lattice (cast lattice body, expanded lattice body, etc.)), and then aged and dried. Therefore, a negative electrode having a non-chemical negative electrode material can be obtained.

The lead-acid battery manufacturing method according to the present embodiment may include a chemical conversion treatment step of performing a chemical conversion treatment of a positive electrode and a negative electrode. The chemical conversion treatment step may be carried out after the assembling step, or may be carried out in the electrode manufacturing step before the assembling step (tank chemical conversion). In the chemical conversion treatment step, for example, the chemical conversion treatment is performed by energizing a direct current while the positive electrode and the negative electrode are in contact with the electrolytic solution. A lead storage battery can be obtained by adjusting the specific gravity of the electrolytic solution after chemical conversion to an appropriate specific gravity.

The electric vehicle (for example, an electric vehicle) or the power supply device according to the present embodiment includes the lead storage battery according to the present embodiment. The method for manufacturing an electric vehicle or a power supply device according to the present embodiment includes a step of obtaining a lead-acid battery by the method for manufacturing a lead-acid battery according to the present embodiment. The method for manufacturing an electric vehicle or a power supply device according to the present embodiment is, for example, a step of obtaining a lead-acid battery by the method for manufacturing a lead-acid battery according to the present embodiment and an electric vehicle or a power supply device by assembling a component including the lead-acid battery. It has a process to obtain. Examples of the electric vehicle include a forklift and a golf cart. Examples of the power supply device include UPS, disaster prevention (emergency) wireless power supply, telephone power supply, and the like. According to the present embodiment, a lead-acid battery for an electric vehicle (for example, a lead-acid battery for an electric vehicle) is provided, and for example, a lead-acid battery for a forklift is provided. According to this embodiment, a lead storage battery for a power supply device is provided.

In lead-acid batteries for electric vehicles, it is easy to design a large electrode height in the battery height direction. Therefore, since sulfuric acid in the electrolytic solution tends to settle downward, maintenance for preventing stratification is important. Therefore, there is a case where the electrolytic solution is agitated by gassing by overcharging at the end of charging. In this case, if the base material of the tube is frayed and the active material is leaking, the active material is soared by this gassing and deposited on the electrode (for example, the negative electrode), so that a short circuit is likely to occur. On the other hand, since the lead storage battery according to the present embodiment can suppress the leakage of the active material, it can suppress the short circuit caused by the gassing, and therefore can be suitably used in the electric vehicle.

10 ... Positive electrode, 20 ... Negative electrode, 30 ... Separator, 50, 50a, 50b, 50c, 50d, 50e, 50f, 50g, 50h ... Active material holding member, 60, 70 ... First tube, 60a, 70a ... One end, 60b, 70b ... other end, 60c, 70c ... central axis (central axis of first tube), 61, 71 ... second tube, 62, 72 ... third tube, 63, 73 ... fourth tube, 64, 74 ... Base material (base material of the first tube), 66a, 67a, 76a, 77a ... Winding end portion (winding end portion of the base material of the first tube), 100 ... Lead storage battery.

Claims

An active material holding member having a first tube and a second tube attached to each other.
The first tube is formed by winding the base material counterclockwise at least once.
When the wound end portion of the base material at one end of the first tube looks at the first tube from the one end side of the first tube in the axial direction of the first tube, the first tube is viewed. The active material retention is located in the range of 0 ° or more and + 90 ° or less on the surface of the first tube with respect to the central axis of the first tube, where the direction in which the second tube is attached to the tube is 0 °. Element.
The first aspect of claim 1, wherein the first tube is formed by spirally winding the base material counterclockwise at least once from the other end of the first tube toward the one end. Active material holding member.
When the winding end portion of the base material at the other end of the first tube is viewed from the other end side in the axial direction of the first tube, the winding end portion with respect to the first tube The second aspect of the present invention, wherein the second tube is located in a range of 0 ° or more and + 90 ° or less on the surface of the first tube with respect to the central axis of the first tube, with the side-by-side direction of the second tube as 0 °. Active material holding member.
The active material holding member according to claim 1, wherein the first tube is formed by winding the base material counterclockwise in a spiral shape at least once.
An active material holding member having a first tube and a second tube attached to each other.
The first tube is formed by winding the base material clockwise at least once.
When the wound end portion of the base material at one end of the first tube looks at the first tube from the one end side of the first tube in the axial direction of the first tube, the first tube is viewed. The active material is located in the range of −90 ° or more and 0 ° or less on the surface of the first tube with respect to the central axis of the first tube, where the direction in which the second tube is attached to the tube is 0 °. Holding member.
The fifth aspect of claim 5, wherein the first tube is formed by winding the base material clockwise at least once in a spiral shape from the other end of the first tube toward the one end. Active material holding member.
When the winding end portion of the base material at the other end of the first tube is viewed from the other end side in the axial direction of the first tube, the winding end portion with respect to the first tube The sixth aspect of the present invention, wherein the second tube is located in a range of −90 ° or more and 0 ° or less on the surface of the first tube with respect to the central axis of the first tube, with the side-by-side direction of the second tube as 0 °. Active material holding member.
The active material holding member according to claim 5, wherein the first tube is formed by winding the base material clockwise at least once in a spiral shape.
The active material holding member according to any one of claims 1 to 8, wherein the base material contains a non-woven fabric.
The active material holding member according to any one of claims 1 to 9, wherein the base material contains polyester.
The active material holding member according to any one of claims 1 to 10, further comprising a tube attached to the first tube on the side opposite to the second tube with respect to the first tube.
An electrode having the active material holding member according to any one of claims 1 to 11 and the active material held in the first tube and the second tube of the active material holding member.
Equipped with positive and negative electrodes
The lead-acid battery, wherein at least one selected from the group consisting of the positive electrode and the negative electrode is the electrode according to claim 12.
The lead-acid battery according to claim 13, further comprising a separator arranged between the positive electrode and the negative electrode.
An electric vehicle comprising the lead-acid battery according to claim 13 or 14.