WO2022074709A1

WO2022074709A1 - Wound battery

Info

Publication number: WO2022074709A1
Application number: PCT/JP2020/037713
Authority: WO
Inventors: 香津雄堤
Original assignee: 株式会社堤水素研究所
Priority date: 2020-10-05
Filing date: 2020-10-05
Publication date: 2022-04-14
Also published as: JPWO2022074709A1

Abstract

If the temperature of an electrode increases, a battery becomes nonfunctional. In conventional wound batteries, it was difficult to suppress the increase of the temperature inside the battery since a separator is wound many times. Therefore, this battery is configured in such a manner that an electrode block is formed by winding tape-shaped negative electrode, positive electrode, and separator with the negative electrode and the positive electrode being shifted to the upper side and the lower side of the separator, the negative electrode of the electrode block is brought into contact with a negative electrode collector, and the positive electrode is brought into contact with a positive electrode collector. Consequently, no separator that becomes thermal conductivity resistance is interposed between the positive electrode and the negative electrode, and the surface of the battery, thereby making it possible to suppress the increase of the temperature inside the wound battery without sacrificing the size of the wound battery. It becomes possible to reduce workload since welding is not used for connecting the electrodes.

Description

Winding battery

The present invention relates to a battery cooling structure, and more particularly to a wound battery for improving the cooling performance of the battery.

As storage batteries, batteries of various shapes such as cylindrical batteries and square batteries have been developed and widely used. A cylindrical type is adopted for a relatively small capacity battery from the viewpoint of pressure resistance and ease of sealing, and a square type is adopted for a relatively large capacity battery from the viewpoint of ease of handling.

Focusing on the electrode structure of storage batteries, laminated batteries and wound batteries are widely used. That is, in a laminated battery, a group of electrodes in which positive electrodes and negative electrodes are alternately laminated via a separator is housed in a battery case. Most laminated batteries have a square battery case. On the other hand, the wound battery is housed in a battery case in a state where the positive electrode and the negative electrode are spirally wound while sandwiching the separator. The battery case of the revolving battery may be cylindrical or square.

Patent Document 1 discloses a technique relating to a cylindrical winding battery. That is, in FIG. 1, the storage battery 1 mainly includes a negative electrode 3, a positive electrode 4, and a separator 5 arranged in a battery case 2. The battery case 2 is a substantially cylindrical container having an opening 2a at the upper portion, and the bottom surface portion thereof serves as a negative electrode terminal. The tape-shaped negative electrode 3 and the positive electrode 4 are arranged in the battery case 2 in a state of being spirally wound while sandwiching the separator 5. Further, the opening 2a of the battery case 2 is tightly sealed by the sealing plate 7 with the electrolytic solution injected into the battery case 2. The cap 6 provided on the upper surface of the sealing plate 7 serves as a positive electrode terminal. The lead wire connected to the positive electrode terminal by welding is connected to the positive electrode 4.

Various methods have been proposed for the cooling structure of the storage battery. Most of them are related to assembled batteries that are modularized by combining a plurality of storage batteries. This is because when the storage battery is modularized and the capacity is increased, the temperature rise of the storage battery becomes a problem. Regarding the cooling structure of the assembled battery, a method of providing a protrusion on the surface of the container containing the assembled battery to disturb the flow of the cooling air to improve heat dissipation (for example, Patent Document 2), or an adjacent assembled battery A method of providing a cooling air passage by interposing a metal cooling plate having a hole between them (for example, Patent Documents 2 and 3) has been proposed.

In Patent Document 4, in a square laminated battery unit in which a separator is interposed between a positive electrode and a negative electrode, a cooling plate is provided between the battery units, and a flow path for a refrigerant is provided in the cooling plate. The cooling structure of the laminate is disclosed.

Japanese Unexamined Patent Publication No. 2002-198044 Japanese Unexamined Patent Publication No. 2009-016285 Japanese Patent Application Laid-Open No. 2003-007355 International Publication No. 2008/09609 Japanese Unexamined Patent Publication No. 2018-142448

The separator, which is one of the components of the battery, is an important part for the battery, which has the role of preventing a short circuit between the positive electrode and the negative electrode, holding the electrolytic solution, and conducting ion conduction between the positive electrode and the negative electrode. However, since the separator uses a non-woven fabric of synthetic fibers such as polyamide fiber and polyolefin fiber as a material, its thermal conductivity is smaller than that of the electrodes of the positive electrode and the negative electrode, and it is difficult to transfer heat.

In the wound battery shown in FIG. 1, in order to suppress the temperature rise inside the battery, it is necessary to transfer heat in the direction perpendicular to the stacking direction (circumferential direction) of the electrode and the separator (radial direction). However, it is difficult to transfer heat well through the electrodes and separators stacked in multiple layers. A separator with low thermal conductivity creates a large temperature gradient, and the temperature rises toward the center of the battery.

That is, although the surface temperature of the battery case of the wound battery is close to the ambient temperature, the temperature of the central portion is high, and the temperature is considerably high especially in the charged / discharged state. Even if the outside of the battery case is cooled, the inside of the battery is not cooled to the required degree and becomes hot.

As a method for cooling the battery, a method of providing a protrusion on the surface of the battery case to improve heat dissipation (for example, Patent Document 2), or a method of providing a metal plate with a hole between the assembled batteries and allowing cooling air to flow to cool the battery. (For example, Patent Documents 2 and 3) or a method for providing cooling fins (for example, Patent Document 5) have been proposed, both of which are effective for cooling the surface of the battery case. Considering the existence of a temperature gradient due to the separator, it cannot be said to be an effective cooling method for a wound battery.

A method of storing a pipe through which cooling water flows inside a battery (for example, Patent Document 4) has been proposed. This method may be said to be a more effective cooling method than cooling the surface of the battery case, but it requires space for cooling, increases the battery size, and reduces the electric capacity per volume.

In many batteries (for example, Patent Document 1 and Patent Document 5), the electrode and the electrode terminal are connected by welding with a thin lead wire. Welding connection requires a large amount of work. Welded connections and thin lead wire connections also increase the internal resistance of the battery due to the presence of electrical resistance.

The present invention has been made to solve the above problems, and provides a battery that suppresses a temperature rise inside the battery and does not require an extra space in the battery for cooling. By solving the problem of electrode welding, it is possible to provide a means for connecting electrodes that does not increase the amount of work and has low electrical resistance.

In order to solve the above-mentioned problems, the winding battery according to the present invention includes a negative electrode, a positive electrode shifted and arranged with respect to the negative electrode, and a separator interposed between the negative electrode and the positive electrode. The negative electrode, the positive electrode, and the separator are provided with an electrode block wound in a direction perpendicular to the shift direction, and the electrode block includes a first electrode projecting portion protruding from one end of the separator and the separator. It has the other electrode protruding portion protruding from the second end portion, and the first electrode protruding portion abuts on the first current collector and is electrically connected to the second electrode protrusion. The portion abuts on the second current collector and is electrically connected.

According to this configuration, the heat generated in the positive electrode and the negative electrode is transferred to the outside through the current collector having good heat conduction, so that it is transferred to the outside of the battery with a small heat gradient. Since a separator having poor heat conduction does not intervene in heat conduction unlike a conventional wound battery, the temperature rise inside the battery can be suppressed.

The temperature gradient of the winding battery according to the present invention is small, and the temperature rise in the central portion of the winding battery can be reduced. Therefore, it is not necessary to provide a pipe or the like for flowing the refrigerant inside the battery, so that the temperature rise can be suppressed with a compact structure.

Welding has high electrical resistance at that point, which causes deterioration of battery efficiency. Further, the welding work is troublesome. According to the present invention, since welding is not used for connecting the electrode and the current collector, it is possible to reduce the amount of work. Further, since the current collector is used without connecting the electrode and the battery terminal with a thin lead wire, the deterioration of the battery efficiency due to the electric resistance is prevented.

The winding battery according to the present invention further includes a conductive box member for accommodating the electrode block and a conductive lid member for covering the opening of the box member, and the box member is the first current collector. It is electrically connected to the body and the lid member is electrically connected to the second collector. Further, in the winding battery according to the present invention, the first electrode protruding portion abuts on the box member and functions as the first current collector.

The winding battery according to the present invention further includes an insulating packing arranged between the box member and the lid member. Further, the winding battery according to the present invention further includes an insulating plate arranged between the electrode block and the second current collector and the bottom of the box member.

Further, in the winding battery according to the present invention, the second current collector is arranged between the insulating plate and the lid member. Further, in the winding battery according to the present invention, the pair of the electrode blocks are arranged at positions facing each other via the pressing member.

The winding battery according to the present invention is a winding battery including a plurality of the winding batteries, wherein the one winding battery is arranged above the other winding batteries and the one winding battery is arranged. The bottom of the box member is in contact with the lid member of the other winding battery. Further, the winding battery according to the present invention includes an electrode block assembly having a plurality of electrode blocks sandwiched between current collectors and having the winding axes in the same direction.

The winding battery according to the present invention includes a plurality of the electrode block aggregates. Further, in the winding battery according to the present invention, the directions of the winding axes of the electrode blocks in the adjacent electrode block aggregates are opposite to each other.

The present invention makes it possible to provide a secondary battery that does not require an extra space for cooling while suppressing a temperature rise inside the battery. Furthermore, since the electrodes and battery terminals are directly collected by the current collector without using lead wires, it contributes to the improvement of battery efficiency.

It is a perspective view which broke a part of the conventional cylindrical winding battery. It is a top view of the electrode before winding. 3A is a cross-sectional view taken along the line AA of FIG. 2 when two separators are used, and FIG. 3B is A of FIG. 2 when one bent separator is used. -A is a cross-sectional view. It is a top view of the electrode block. It is BB sectional view of the electrode block of FIG. It is an exploded perspective view of the winding battery of 1st Embodiment. FIG. 6 is a cross-sectional view taken along the line CC of the winding battery of the first embodiment shown in FIG. It is a drawing which made the assembly battery by stacking the winding battery of 1st Embodiment. It is sectional drawing in the axial direction which shows the schematic structure of the winding assembly battery of 2nd Embodiment. It is sectional drawing in the axial direction which shows the schematic structure of the winding assembly battery of 3rd Embodiment. It is a top view of the electrode block assembly in the winding assembly battery of 3rd Embodiment. It is sectional drawing in the axial direction which shows the schematic structure of the winding assembly battery of 4th Embodiment.

An embodiment of the present invention will be described below. The present embodiment is an example of carrying out the present invention, and the present invention is not limited to the present embodiment.

Prior to explaining each embodiment of the present invention, a nickel hydrogen battery will be described as an example as a winding battery to which the present invention is applied. The type of secondary battery is not limited to the nickel-metal hydride battery. Further, a nickel-metal hydride battery in which hydrogen gas is enclosed may be used.

The material of the electrode substrate is not particularly limited as long as it has high electrical conductivity and can energize the held electrode material. The positive electrode substrate is preferably Ni from the viewpoint of stability in the electrolytic solution and oxidation resistance. In addition, iron coated with nickel may be used. The negative electrode substrate is preferably Ni or the like from the viewpoint of stability in the electrolytic solution and reduction resistance. In addition, iron coated with nickel or carbon may be used.

As the shape of the electrode substrate, a metal porous body having a three-dimensional structure is desirable, of which an embossed body or a foam is preferable because the packing density can be increased and the output characteristics are good.

The positive electrode material is preferably metal oxide. For example, silver oxide, manganese dioxide, nickel oxyhydroxide can be mentioned. Examples of the negative electrode material include hydrogen storage alloys, platinum, and palladium. Of these, from the viewpoints of hydrogen storage capacity, charge / discharge characteristics, self-discharge characteristics, and cycle life characteristics, a pentagonal alloy containing a misch metal of MmNiComnAl, which is an AB5 type rare earth-nickel alloy, is preferable. Alternatively, it is preferably a LaMgNi-based alloy called a superlattice hydrogen storage alloy. In addition, you may use 1 type or 2 or more types of these alloys.

The conductive auxiliary agent is for imparting conductivity to the active material and increasing its utilization rate. The conductive auxiliary agent is preferably a carbon material that does not elute into the electrolytic solution during discharge and is not easily reduced by hydrogen. Carbon black is preferable as the conductive auxiliary agent used for the negative electrode. The conductive auxiliary agent used for the positive electrode is preferably graphitized soft carbon.

The positive electrode material, binder, and conductive auxiliary agent are mixed and kneaded into a paste. This paste is applied or filled on the positive electrode substrate and dried. Then, a positive electrode is produced by rolling the positive electrode substrate with a roller press or the like. Similarly, the negative electrode material, the binder, and the conductive auxiliary agent are mixed and kneaded into a paste. This paste is applied or filled on the negative electrode substrate and dried. Then, the negative electrode is manufactured by rolling the negative electrode substrate with a roller press or the like.

Examples of the binder include sodium polyacrylic acid, methyl cellulose, carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), ethylene-vinyl alcohol, ethylene vinyl acetate copolymer (EVA), polyethylene ( PE), polypropylene (PP), fluororesin, styrene-ethylene-butylene-styrene copolymer (SEBS).

Further, polytetrafluoroethylene (PTFE) may be used as a binder. PTFE is less likely to be reduced by hydrogen, is less likely to deteriorate even when used for a long period of time in a hydrogen atmosphere, and can be expected to have a long life.

When the total of the positive and negative electrode materials, the binder, and the conductive auxiliary agent is 100% by mass, the mass ratio of the binder to be blended in the positive and negative electrodes is preferably set to 20% by mass or less, preferably 10% by mass. It is more preferably set to% or less, and further preferably set to 5% by mass or less. The binder has poor electron conductivity and ionic conductivity, and if the proportion of the binder exceeds 20% by mass, it becomes difficult to increase the capacity.

The electrolytic solution is not particularly limited as long as it is used in a battery using hydrogen as an active material, but for example, salts such as potassium hydroxide (KOH), lithium hydroxide (LiOH), and sodium hydroxide (NaOH) are added to water. It is preferable to dissolve it in. From the viewpoint of the output characteristics of the battery, the electrolytic solution is preferably an aqueous solution of sodium hydroxide.

As the separator, a known one used for a secondary battery can be used. Examples of the shape of the separator include a microporous film, a woven fabric, a non-woven fabric, and a green compact, and among these, a non-woven fabric is preferable from the viewpoint of output characteristics and production cost. The material of the separator is not particularly limited, but it is preferable that it has alkali resistance, oxidation resistance, and reduction resistance. Specifically, as the material for forming the separator, for example, polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyphenylene sulfide fibers, polyfluoroethylene fibers, polyamide fibers and the like can be used. The separator holds an electrolytic solution.

Since polyolefin fibers are hydrophobic, they need to be treated with hydrophilicity. When used in a hydrogen gas atmosphere, a separator treated with fluorine gas is preferable. Further, a separator coated or coated with a metal oxide on the surface of the separator is preferable.

A separator that has been imparted with hydrophilicity by treatment with fluorine gas or coated with a metal oxide can be expected to have a long life because the hydrophilicity is not easily lost by hydrogen even when used in hydrogen gas. Here, examples of the metal oxide include titanium oxide, zirconium oxide, yttrium oxide, hafnium oxide, calcium oxide, magnesium oxide, scandium oxide and the like. Zirconia (ZrO ₂ ) or yttrium oxide (Y ₂ O ₃ ) is preferred. Since the metal oxide has hydrophilicity and is not easily deteriorated by hydrogen, it can maintain hydrophilicity for a long period of time and suppress the dryout of the electrolytic solution.

The materials for the electrodes and separators are formed into a sheet having a predetermined width, and are wound up for storage and transportation. The material of the sheet-shaped electrode and separator is cut according to the shape of the electrode block, but since the electrode and separator of the present embodiment are tape-shaped, unnecessary scraps are not generated. In particular, the negative electrode is expensive, so its yield contributes to the reduction of manufacturing cost.

<First Embodiment>
After explaining the electrode block common to each embodiment, the details of the winding battery of each embodiment will be described.
The electrode block 15 is manufactured by winding the negative electrode 11, the positive electrode 12, and the separator 13 interposed between the negative electrode 11 and the positive electrode 12. As shown in the plan view of FIG. 2, the negative electrode 11, the positive electrode 12, and the separator 13 before winding are all in the form of a tape, and the negative electrode 11 is in a state of protruding from one end of the separator 13. The positive electrode 12 is in a state of protruding from the other end of the separator 13.

The negative electrode 11 and the positive electrode 12 are arranged so as to be shifted above or below the separator 13, respectively. In other words, it can be said that the negative electrode 11 and the positive electrode 12 are positioned vertically offset from each other when viewed from the separator 13.

FIG. 3A is a cross-sectional view taken along the line AA of FIG. 2, and is a view when two separators 13 having the same width are used. FIG. 3B is a cross-sectional view taken along the line AA of FIG. 2 and is a view when one bent separator 13 is used. As shown in FIG. 3A, the two separators 13 have the same width, and their ends are in a uniform positional relationship.

The electrode block 15 is manufactured by winding the negative electrode, the positive electrode arranged so as to be shifted with respect to the negative electrode, and the separator in the direction perpendicular to the shift direction. A plan view of the electrode block 15 is shown in FIG. 4, and a cross-sectional view taken along the line BB of FIG. 4 is shown in FIG. FIG. 5 is a cross-sectional view in the direction perpendicular to the winding axis. The shifted direction and the winding direction of the negative electrode 11 and the positive electrode 12 are perpendicular to each other. The negative electrode 11 is exposed from one side end of the electrode block 15, and the positive electrode 12 is exposed from the other side end.

Therefore, the unexposed end of the negative electrode 11 is covered with the separator 13 and the positive electrode 12, and the unexposed end of the positive electrode 12 is covered with the separator 13 and the negative electrode 11. It is in a state of being. The electrode block 15 is configured by winding a negative electrode 11, a positive electrode 12, and a separator 13 around a polypropylene core material 14.

FIG. 6 is an exploded perspective view of the winding battery 10 according to the first embodiment of the present invention. As shown in FIG. 6, the winding battery 10 of the present embodiment includes a conductive box member 16 containing an electrode block 15, a conductive lid member 17 covering an upper opening of the box member 16, and a box member. The insulating packing 18 interposed between the 16 and the lid member 17 is combined and integrally configured. The box member 16 has a hollow rectangular parallelepiped shape with an open upper part. The lid member 17 covers the open portion of the box member 16 after supplying the electrolytic solution. Both the box member 16 and the lid member 17 are made of nickel-plated steel plate. The nickel-plated steel plate has high electrical conductivity, good stability and oxidation resistance in the electrolytic solution, and is also excellent in strength. The packing 18 is made of polypropylene.

Inside the box member 16, two electrode blocks 15 are arranged so as to face each other so that their winding axes are parallel to the bottom surface of the box member 16 and the winding axes are opposite to each other. .. Here, in the electrode block 15 wound around the winding shaft, it is determined that the winding shaft is inverted by reversing the position of the negative electrode 11 and the position of the positive electrode 12. Hereinafter, the negative electrode portion exposed from one side end portion of the electrode block 15 is referred to as a negative electrode protruding portion 22, and the positive electrode portion exposed from the other side end portion is referred to as a positive electrode protruding portion 23.

The positive electrode protruding portion 23 of the first electrode block 15a is in contact with one side surface of the box member 16, and the positive electrode protruding portion 23 of the second electrode block 15b is the positive electrode protruding portion 23 of the first electrode block 15a. Is in contact with the side surface of the box member 16 which is in contact with the side surface of the box member 16. The box member 16 functions as a positive electrode current collector. The negative electrode protruding portions 22 of the two electrode blocks 15a and b are in contact with the negative electrode current collector 20 made of nickel-plated steel plate, respectively.

A holding member 19 is arranged between the two negative electrode current collectors 20 and plays a role of fixing the positions of the two electrode blocks 15 inside the box member 16. Since the pressing member 19 presses the two electrode blocks 15a and b toward the inner side surface of the box member 16, the positive electrode protruding portion 23 is pressed against the inner side surface of the box member 16, and the negative electrode protruding portion 22 is the negative electrode. It is pressed against the current collector 20. As a result, the contact between the electrode and the current collector is ensured, and the contact resistance is reduced.

FIG. 7 shows a cross-sectional view taken along the line CC of the winding battery 10 in FIG. An insulating plate 21 is arranged on the bottom surface of the box member 16 to prevent the lower end of the negative electrode current collector 20 from coming into contact with the bottom of the box member 16 to cause a short circuit. The upper end of the negative electrode current collector 20 abuts on the back surface of the lid member 17, and the lid member 17 functions as a negative electrode terminal. On the other hand, the box member 16 which is a positive electrode current collector functions as a positive electrode terminal.

As shown in FIG. 8, the winding battery 10 of 1 is mounted on the other winding battery 10, and the bottom of the box member 16 of the winding battery 10 is the lid member 17 of the other winding battery 10. These winding batteries 10 can be connected in series by stacking them so as to be in contact with each other. By connecting in this way, it is not necessary to provide wiring for the connection between the winding batteries 10, and it is possible not only to reduce the wiring space and the wiring man-hours, but also to reduce the DC resistance loss due to the wiring. Will be.

<Cooling structure>
The operation and effect of the cooling structure of the first embodiment will be described. The heat generated in the positive electrode 12 is directly conducted from the positive electrode protrusion 23 to the metal box member 16, and the heat is immediately dissipated from the surface of the box member 16 to the outside (see FIG. 7). Since the heat conduction of the positive electrode 12 does not pass through the separator 13 having a large thermal resistance, the temperature rise inside the wound battery 10 is significantly improved as compared with the conventional wound battery.

Similarly, the heat generated in the negative electrode 11 is also transferred from the negative electrode protruding portion 22 to the negative electrode current collector 20 and dissipated to the outside via the lid member 17. The heat conduction of the negative electrode 11 does not pass through the separator 13 having a large thermal resistance. Further, the heat generated in the negative electrode 11 is transferred to the outside via the separator 13 and the positive electrode 12. Although it is difficult to transfer heat to the separator 13, since it is thin and only one sheet is used, it does not significantly hinder the conduction of heat. As described above, the heat generated in the positive electrode 12 and the negative electrode 11 is transferred to the outside through the box member 16 and the lid member 17 with a small thermal resistance, and it is possible to suppress the temperature rise inside the winding battery 10. ing.

<Second Embodiment>
FIG. 9 is a sectional view taken along the axis of the wound-wound battery according to the second embodiment of the present invention, and shows a schematic configuration of the wound-wound battery. In the winding

battery

24, 40 cells 34 including 40 electrode blocks 25 and 41 current collectors 26 are connected in series and housed inside the outer case 31. The winding battery 24 is sealed by an outer case 31 and pressure plates 29 arranged at both ends thereof. A sealing agent is arranged between the outer case 31 and the pressure plate 29, and the wound battery 24 is held liquidtightly. The electrolytic solution is supplied to the inside of the winding battery 24 from the injection port (not shown) of the pressure plate 29.

The electrode block 25 is arranged so that its winding shaft is in the same direction as the axial direction of the wound assembled battery 24, and is sandwiched between the current collectors 26. That is, the negative electrode protruding portion of the electrode block 25 is in contact with one surface of the current collector 26, and the positive electrode protruding portion of the adjacent electrode block 25 is in contact with the other surface of the current collector 26. As a result, the cells composed of the electrode block 25 and the current collector 26 are connected in series to form the winding battery 24. Assuming that the terminal voltage of the nickel-metal hydride battery is 1.2V, a DC power supply of 1.2x40 = 48V can be obtained.

The cell 34 composed of the current collector 26 and the electrode block 25 is contained in the insulating cylinder 30 and insulates the cell 34 from the outer case 31. Further, an insulating plate 27 and a metal pressing plate 28 are arranged in this order at both ends of the 40 cells 34, and the insulating plate 27 insulates the current collector 26 and the pressure plate 29 to cause an external short circuit. It prevents it from happening.

The pressing plate 28 is pressed to the right by rotating the pressing bolt 32 attached to the pressure plate 29 on the left side of FIG. This stress is transmitted to the cell 34 via the insulating plate 27, and compressive stress is applied to the electrode block 25. A plurality of taps are provided around the pressure plate 29 on the right side, and the outer case 31 is fixed to the pressure plate 29 by a set screw 33.

The current collecting of the wound assembled battery 24 can be performed by the same method as that of the wound assembled battery of the third embodiment by using the electrode terminals described later.

<Third Embodiment>
FIG. 10 is an axial sectional view of the wound battery according to the third embodiment of the present invention, and shows a schematic configuration of the battery. In FIG. 10, four electrode block aggregates 41 are included in an insulating protective cylinder 45 to form a wound battery 40. The outside of the protective cylinder 45 is covered with the outer case 48, and the wound battery 40 is sealed by the outer case 48 and the pressure plates 46 arranged at both ends of the outer case 48. A sealing agent is arranged between the outer case 48 and the pressure plate 46, and the wound battery 40 is held liquidtightly. The protective cylinder 45 prevents the electrode block assembly 41 from causing an external short circuit. The electrolytic solution is supplied to the inside of the winding battery 40 from the injection port (not shown) of the pressure plate 46.

In the present embodiment, the electrode block assembly 41 is composed of 40 electrode blocks 42 and 41 current collectors 43, respectively (see FIG. 11). Current collectors 43 are arranged on both sides of the electrode block 42, and each electrode block 42 is sandwiched between the current collectors 43. The electrode block 42 is arranged so that its winding axis is in the same direction as the axial direction of the electrode block assembly 41. That is, the negative electrode projecting portion of the electrode block 42 abuts on one surface of the current collector 43, and the positive electrode projecting portion of the adjacent electrode block 42 abuts on the other surface of the current collector 43. As a result, the cells 55 composed of the electrode block 42 and the current collectors 43 at both ends thereof are connected in series with each other.

In this way, 40 cells 55 are sequentially connected to form the electrode block aggregate 41. Since the winding axes of the electrode blocks 42 are arranged so as to be in the same direction, the electrode block assembly 41 has 40 cells 55 connected in series. FIG. 10 shows the polarity of the electrode block assembly 41 graphically for convenience.

As shown in FIG. 10, two adjacent electrode block aggregates 41 in which the winding axes of the electrode blocks 42 are opposite to each other, in other words, two electrode block aggregates 41 having different polarities of the cells 55, are common. When connected by the current collector 43t, these electrode block aggregates 41 are connected in series. In the embodiment of FIG. 10, four electrode block aggregates 41 in series with 40 cells are connected in series, so that a DC power supply of 1.2 × 40 × 4 = 192V can be obtained.

A current collector 43t and an insulating plate 44 are arranged between the pressure plate 46 and the electrode block assembly 41, and the insulating plate 44 prevents the electrode block assembly 41 from being externally short-circuited via the pressure plate 46. I'm preventing it. The pressure plate 46 and the electrode block assembly 41 sandwiched therein are connected by a plurality of through bolts 49, and the winding battery 40 is assembled.

Two electrode terminals 47 are attached to the wound battery 40. The electrode terminal 47 has a three-layer structure consisting of a bolt 51, an energizing body 52 arranged around the bolt 51, and an insulating collar 50 surrounding the bolt 51 and the energizing body 52. The bolt 51 serves as a strength member for mounting the electrode terminal 47, and the energizing body 52 is a good conductor of electricity of copper or nickel and serves as a path for electricity. The bolt 51 generally has electrical resistance and is not suitable as an electric path. The insulating collar 50 prevents the electrode terminal 47 from coming into contact with the pressure plate 46 and causing a short circuit. In the figure, the upper electrode terminal 47 is a negative electrode terminal, and the lower electrode terminal 47 is a positive electrode terminal. A terminal 54 and a washer 53 are attached to the bolt 51, and an electric wire can be connected to the terminal 54.

<Fourth Embodiment>
FIG. 12 is a sectional view taken along the axis of the wound-wound battery according to the fourth embodiment of the present invention, and shows a schematic configuration of the wound-wound battery. In FIG. 12, four electrode block aggregates 61 constitute a winding battery 60. Basically, the winding battery 60 of the fourth embodiment has substantially the same configuration as the winding battery 40 of the third embodiment, and the differences thereof will be described.

In the wound battery 40, the polarities of the adjacent electrode block aggregates 41 are reversed, but in the wound battery 60, the polarities of the adjacent electrode block aggregates 61 are in the same direction. The electrode block aggregate 61 having these polarities in the same direction is connected between the negative electrode current collector 63A and the positive electrode current collector 63B. As a result, in the winding battery 60, four electrode block aggregates 61 are connected in parallel.

The winding battery 60 can take out electricity from the two left and right electrode terminals 67 to the outside. The electrode terminal 67 has a three-layer structure similar to that of the electrode terminal 47 of the third embodiment.

The wound battery according to the present invention can be suitably used not only as an industrial power storage device but also as a consumer power storage device.

1 Storage battery 2 Battery case 3 Negative electrode 4 Positive electrode 5 Separator 6 Cap 7 Seal plate 10 Rolling battery (first embodiment)
11 Negative electrode 12 Positive electrode 13 Separator 14 Core material 15 Electrode block 16 Box member 17 Lid member 18 Packing 19 Presser member 20 Negative electrode current collector 21 Insulation plate 22 Negative electrode protrusion 23 Positive electrode protrusion 24 Winding battery (second embodiment)
25 Electrode block 26 Current collector 27 Insulation plate 28 Presser plate 29 Pressure plate 30 Insulation cylinder 31 Exterior case 32 Push-in bolt 33 Set screw 34 Cell 40 Rewinding battery (third embodiment)
41 Electrode block assembly 42 Electrode block 43 Current collector 44 Insulation plate 45 Protective cylinder 46 Pressure plate 47 Electrode terminal 48 Exterior case 49 Through bolt 50 Color 51 Bolt 52 Current body 53 Washer 54 Terminal 55 Cell 60 Winding battery (No. 1) 4 Embodiment)
61 Electrode block aggregate 63 Current collector 67 Electrode terminal

Claims

It includes a negative electrode, a positive electrode shifted and arranged with respect to the negative electrode, and a separator interposed between the negative electrode and the positive electrode, and the negative electrode, the positive electrode, and the separator are wound in a direction perpendicular to the shift direction. Equipped with an electrode block
The electrode block has a first electrode protrusion protruding from one end of the separator and a second electrode protrusion protruding from the other end of the separator.
The first electrode protrusion is in contact with the first current collector and is electrically connected, and the second electrode protrusion is in contact with the second current collector and is electrically connected. Time battery.
A conductive box member for accommodating the electrode block and a conductive lid member for covering the opening of the box member are further provided.
The winding battery according to claim 1, wherein the box member is electrically connected to the first current collector, and the lid member is electrically connected to the second current collector.
The winding battery according to claim 2, wherein the first electrode protrusion abuts on the box member and functions as the first current collector.
The wound battery according to claim 3, further comprising an insulating packing arranged between the box member and the lid member.
The winding battery according to claim 4, further comprising an insulating plate arranged between the electrode block and the second current collector and the bottom of the box member.
The wound battery according to any one of claims 1 to 5, wherein the second current collector is arranged between the insulating plate and the lid member.
The winding battery according to any one of claims 1 to 6, wherein the pair of electrode blocks are arranged at positions facing each other via a pressing member.
A winding battery comprising a plurality of the winding batteries according to claim 7.
The one winding battery is placed on top of the other winding battery.
A wound battery in which the bottom of the box member of the one wound battery is in contact with the lid member of the other wound battery.
A winding battery comprising an electrode block assembly having a plurality of electrode blocks according to claim 1, which are sandwiched between current collectors and whose winding axes are in the same direction.
The winding battery according to claim 9, further comprising a plurality of the electrode block aggregates.
The wound assembly battery according to claim 9, wherein the directions of the winding axes of the electrode blocks in the adjacent electrode block assembly are opposite to each other.