JP2002231298A - Battery and battery pack using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance energy density and to dissipate heat generated in charging and discharging a battery. SOLUTION: A layered product is formed by interlaying a separator 14 between a positive electrode collector 12 holding a positive electrode material and a negative electrode collector 13 holding a negative electrode material, and a roll body 17 is formed by rolling the layered product in a roll-like form so as to expose the positive electrode collector to the inside surface and to expose the negative electrode collector to the outside surface. A conductive hollow tube 18 also used as a positive electrode is so inserted into the air core of the roll body as to bring the positive electrode collector into contact with the outside surface, and thus a passage hole 18c capable of passing a coolant is formed at the center of the hollow tube. The roll body is so housed in a conductive vessel 21 also used as a negative electrode as to bring the negative electrode collector into contact with the inside surface, a first permeable hole 21b capable of communicating with the passage hole is formed in the bottom wall 21a of the vessel, and the vessel is electrically insulated from the hollow tube. A second permeable hole 22a having a tip capable of inserting the tip of the hollow tube is formed in a lid 22 for closing the opening of the vessel, and an insertion part 18d at the upper end of the hollow tube is formed in a size capable of being inserted into a first through-hole of another battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery having a through hole formed at the center thereof and an assembled battery using the same. More specifically, the present invention relates to a battery having high-rate discharge characteristics suitable for electric vehicles and the like, and having excellent cooling properties, and a battery pack using the same.

[0002]

2. Description of the Related Art Conventionally, it is known that a battery or an assembled battery used as a power source of an electric vehicle or the like generates a large amount of heat during charging or discharging (particularly under a high current density load).
In order to dissipate the heat generated in this way, for example, a cylindrical battery disclosed in JP-A-10-112330 is disclosed. In this cylindrical battery, a band-shaped positive electrode current collector holding a positive electrode active material and a band-shaped negative electrode current collector holding a negative electrode active material are wound in a roll shape by shifting them by a predetermined width in the width direction. A hollow hole is formed in the center of the configured unit cell, a plurality of holes are formed in the positive electrode current collector electrically connected to one side end surface of the unit cell, and further, the other side end surface of the unit cell is formed. A plurality of holes are formed in the negative electrode current collector electrically connected. Further, a hollow core is inserted into the center of the unit cell to form a hollow having the function of a ventilation hole for cooling in the center of the unit cell. This hollow core is composed of an inner cylinder made of stainless steel or aluminum and an outer cylinder made of an insulating material such as polyethylene or polypropylene. In the cylindrical battery configured as described above, heat generated inside the unit cell can be dissipated by flowing a refrigerant such as air into the hollow hole of the unit cell, and the heat is applied to the positive current collector and the negative current collector. Gas generated inside the unit cell is released from the plurality of formed holes.

[0003]

However, in the above-mentioned conventional cylindrical battery disclosed in Japanese Patent Application Laid-Open No. H10-112330, a hollow core (having a relatively large wall thickness) inserted at the center of a unit cell is used. Since a large amount of space is occupied, and the positive electrode current collector and the negative electrode current collector are wound in a roll shape while being shifted in the width direction, that is, up and down, there is a problem that the energy density of the battery is reduced. An object of the present invention is to provide a battery and an assembled battery using the same, which can increase the energy density, dissipate heat generated during charging or discharging, and rapidly cool the battery. Another object of the present invention is to provide a battery pack that can connect a plurality of batteries very easily or relatively easily.

[0004]

According to the first aspect of the present invention,
As shown in FIG. 1 to FIG. 3, these current collectors 12, between a band-shaped positive electrode current collector 12 holding a positive electrode active material and a band-shaped negative electrode current collector 13 holding a negative electrode active material, A laminate 16 is formed by interposing a separator 14 for preventing a short circuit of the battery 13 and holding an electrolytic solution.
2 is a roll body formed by being wound in a roll shape such that the negative electrode current collector 2 is exposed on the inner peripheral surface and the negative electrode current collector 13 is exposed on the outer peripheral surface, and the roll body is formed such that the positive electrode current collector 12 contacts the outer peripheral surface. A conductive hollow tube 18, which is inserted into the air core 17 and has a through hole 18 c through which a coolant can pass at the center, also serves as a positive electrode, and a roll body 17 so that the negative electrode current collector 13 contacts the inner peripheral surface. A conductive container serving as a negative electrode electrically connected to the conductive hollow tube 18 and having a first through hole 21b formed in the bottom wall 21a and communicating with the through hole 18c of the conductive hollow tube 18; The conductive hollow tube 1 is closed by closing the opening of the conductive container 21.
A battery provided with a second through hole 22a through which the tip end of the conductive member 8 can be inserted or communicated, and a lid 22 which is electrically insulated from one or both of the conductive hollow tube 18 and the conductive container 21. is there.

In the battery according to the first aspect, the conductive hollow tube 18 also serves as a positive electrode, the conductive container 21 also serves as a negative electrode, and the positive electrode current collector 12 and the negative electrode current collector 13 are arranged in the width direction. Since there is no need to shift, the energy density can be increased. The heat generated during charging or discharging is carried by the refrigerant passing through the through hole 18c of the conductive hollow tube 18 and the first through hole 21b of the conductive container 21 or the refrigerant flowing along the outer peripheral surface of the conductive container 21. It is dissipated.

The invention according to claim 2 is the invention according to claim 1, and further includes a conductive hollow tube 18 as shown in FIG.
An insertion portion 18d formed at the tip of the first member protrudes from the roll body 17 and is inserted into the first through hole 21b. In the battery according to the second aspect, the plurality of batteries 1
When the first through hole 18c and the first through hole 21b are connected in series so as to communicate in a straight line, the hollow tube 18 of the battery 11
Are inserted into the first through holes 21b of the other batteries 11, so that each battery 11 does not come off.

According to the third aspect of the present invention, a short-circuit between the belt-like positive electrode current collector holding the positive electrode active material and the band-like negative electrode current collector holding the negative electrode active material is prevented. Prevent and form a laminate by interposing a separator that holds the electrolytic solution, and further form the laminate in a roll shape such that the negative electrode current collector is exposed on the inner peripheral surface and the positive electrode current collector is exposed on the outer peripheral surface, respectively. A conductive member which also serves as a roll body formed by winding and a negative electrode which is inserted into the air core of the roll body so that the negative electrode current collector comes into contact with the outer peripheral surface and has a through hole formed at the center thereof through which a refrigerant can pass. A hollow body, a first through-hole formed in a bottom wall of the roll body so as to be in contact with the positive electrode current collector on the inner peripheral surface thereof, and a first through-hole that can communicate with a through-hole of the conductive hollow tube; A conductive container that also functions as a positive electrode electrically insulated from the tip of the conductive hollow tube that closes the opening of the conductive container. It is a cell equipped with either one or both electrically insulated lid of insertion or communicable second hole is formed and the conductive hollow catheter or conductive container.

In the battery according to the third aspect, the conductive hollow tube also functions as the negative electrode, the conductive container also functions as the positive electrode, and there is no need to shift the negative electrode current collector and the positive electrode current collector in the width direction. Therefore, the energy density can be increased. Further, heat generated during charging or discharging is carried and dissipated by a refrigerant passing through the through-hole of the conductive hollow tube and the first through-hole of the conductive container or a refrigerant flowing along the outer peripheral surface of the conductive container. .

The invention according to claim 4 is the invention according to claim 3, characterized in that the tip of the conductive hollow tube is protruded from the roll body and inserted into the first through hole. I do. In the battery according to the fourth aspect, when the plurality of batteries are connected in series so that the through-holes and the first through-holes communicate with each other in a straight line, the tip of the hollow tube of the battery is connected to the other battery. Since each battery is inserted into one through hole, each battery does not come off.

According to a fifth aspect of the present invention, as shown in FIG. 4, the plurality of batteries 11 according to the first or second aspect communicate with the through holes 18c and the first through holes 21b of these batteries 11 in a straight line. It is an assembled battery configured to be connected in series so as to perform In the battery pack according to the fifth aspect, the plurality of batteries 11 can be connected in series very easily, and the heat generated during charging or discharging passes through the communicating hole 18c and the first through hole 21b. It is conveyed and diffused by a refrigerant or a refrigerant flowing along the outer peripheral surface of the conductive container 21.

According to a sixth aspect of the present invention, as shown in FIGS. 5 and 6, a plurality of batteries 11 according to the first or second aspect are placed in the same plane and through holes 18c of each conductive hollow tube 18 are provided. Are arranged so that the polarities of the batteries 11 which are orthogonal to the plane and are further adjacent to each other are opposite to each other, and the connecting member 63 is connected between the positive electrode of each battery 11 and the negative electrode of the battery 11 adjacent to this battery 11. And the negative electrode of each of the batteries 11 is connected to the positive electrode of another adjacent battery 11 from the adjacent battery 11 by the connector 63.
And a first hole 71a communicating with the through hole 18c of each battery 11 with the first hole 71a.
This is an assembled battery in which second holes 72a communicating with the through holes 21b are respectively formed. In the battery pack according to the sixth aspect, the plurality of batteries 11 can be connected in series relatively easily via the connector 63, and the heat generated at the time of charging or discharging is discharged through the second hole 72a, the first hole. The refrigerant is conveyed and dissipated by the refrigerant passing through the through-hole 21b, the through-hole 18c, and the first hole 71a, or the refrigerant flowing along the outer peripheral surface of the conductive container 21.

According to a seventh aspect of the present invention, as shown in FIG. 8, a plurality of sets of the tentatively assembled batteries 40a to 40a
40c, and these temporary assembled batteries 40a to 40c are arranged in the same plane, and the cores of the through holes 18c of the conductive hollow tubes 18 are orthogonal to the plane and are further adjacent to the temporary assembled batteries 40a to 40c.
0c are arranged so that the polarities thereof are opposite to each other.
The positive electrodes 0a to 40c are connected to the negative electrodes of the temporary assembled batteries 40a to 40c adjacent to the temporary assembled batteries 40a to 40c via the connector 63, and the negative electrodes of the temporary assembled batteries 40a to 40c are connected to the adjacent temporary assembled batteries. Each of the temporary assembled batteries 40a to 40c is connected to the positive electrode of another adjacent temporary assembled battery 40a to 40c via a connector 63 different from the connector 63.
The first hole 71a communicating with the through hole 18c of
This is an assembled battery in which second holes 72a communicating with the through holes 21b are respectively formed. In the battery pack according to the seventh aspect, a plurality of batteries 11 are connected in series to form a temporary battery pack 40a.
40c are assembled in series and these temporary assembled batteries 40a to 40c are connected in series by the connector 63.
Since the hole 71a and the second hole 72a are formed, the through hole 18c of each hollow tube 18 and the first through hole 21b of each container 21 are formed.
Are released, and heat generated at the time of charging or discharging flows through the second hole 72a, the first through hole 21b, the through hole 18c, and the first hole 71a, or the refrigerant flowing along the outer peripheral surface of the conductive container 21. Is conveyed and dissipated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, in this embodiment, the battery 11 is a nickel-metal hydride secondary battery, and has a band-shaped positive electrode current collector 12 and a band-shaped negative electrode current collector 13.
Laminate 16 obtained by interposing a separator 14 between
And a conductive hollow tube 1 serving also as a positive electrode inserted into the air core of the roll 17.
8 and a conductive container 2 containing a roll body 17 and also serving as a negative electrode
1 is provided.

The positive electrode current collector 12 is formed by first cutting a non-woven fabric of a polypropylene-polyethylene copolymer having conductivity by applying nickel plating to the surface thereof to form a positive electrode substrate. It is formed by filling a void mainly in the substrate with a paste mainly composed of nickel hydroxide (Ni (OH) ₂ ), which is a positive electrode active material, followed by drying, followed by pressure (rolling) molding. Negative electrode current collector 13
First, a negative electrode substrate is formed by cutting a non-woven fabric of a polypropylene-polyethylene copolymer having conductivity imparted in the same manner as the positive electrode substrate to form a negative electrode, and then forming a negative electrode active material in the pores of the negative electrode substrate. It is formed by filling with a paste mainly composed of a certain hydrogen storage alloy powder, drying, and then press (rolling) molding. As the positive electrode substrate and the negative electrode substrate, besides a nonwoven fabric of a polypropylene-polyethylene copolymer, a commercially available porous nickel sintered foam having a porosity of about 95%, and particularly, the surface of the negative electrode substrate is nickel-plated. It is possible to use a thin metal plate (punched metal) or the like which has been subjected to a number of holes and has many holes.

The separator 14 is formed in a strip shape from a nonwoven fabric of a polypropylene-polyethylene copolymer, and is interposed between the positive electrode current collector 12 and the negative electrode current collector 13 of the laminate 16. The separator 14 is configured to prevent a short circuit between the positive electrode current collector 12 and the negative electrode current collector 13 and to hold an electrolyte composed of a 30% by weight aqueous solution of potassium hydroxide (KOH). The roll body 17 is a positive electrode current collector 1
2 are formed so as to be exposed on the inner peripheral surface and the negative electrode current collector 13 is formed on the outer peripheral surface (FIGS. 1 and 2).

The conductive hollow tube 18 also serving as a positive electrode is formed in a square cylindrical shape by extrusion or the like, and has a large-diameter portion 18a inserted into the air core of the roll body 17, and a large-diameter portion at the upper end of the large-diameter portion. And the roll body 17 are provided integrally so that the axes thereof coincide with each other.
And a small-diameter portion 18b projecting upward from FIG. 1 (FIGS. 1 and 3). The large-diameter portion 18a is configured such that the large-diameter portion comes into contact with the positive electrode current collector 12 with the air core of the roll body 17 inserted therein (FIG. 1). The body 12 is physically joined to the outer peripheral surface of the conductive hollow tube 18 by spot welding or the like before manufacturing the roll body 17 (FIG. 3A).

On the other hand, the conductive container 21 also serving as a negative electrode is formed in a square cylindrical shape having a bottom wall 21a, and an opening at the upper end of the container 21 is closed by a lid 22 (FIGS. 1 and 2).
The container 21 is configured to be able to accommodate the roll body 17 together with the large diameter portion 18a of the hollow tube 18 so that the negative electrode current collector 13 contacts the inner peripheral surface. A first through hole 21b communicating with the through hole 18c of the hollow tube 18 is formed at the center of the bottom wall 21a of the container 21, and a small diameter portion 18b of the hollow tube 18 is formed at the center of the lid 22.
Is formed (FIG. 1).

The first through-hole 21b is formed by connecting a conductive hollow tube 18 integrated with the roll body 17 to the conductive container 21 so that the bottom wall 21a is aligned with the axis of the conductive container 21 and a small-diameter ring-shaped lower insulator 23a. And the lower insulator 23a is inserted into the bottom wall 2 in a state of being inserted via the large-diameter ring-shaped lower insulating sheet 23b.
The conductive hollow tube 18 is formed by being deformed upward with a press die or the like and inserted into the through hole 18c of the large-diameter portion 18a of the conductive hollow tube 18. The lower insulator 23a secures electrical insulation between the conductive hollow tube 18 serving also as a positive electrode and the conductive container 21 serving also as a negative electrode, and also has an airtightness for preventing gas generated in the battery 11 from leaking to the outside of the battery. It has a function to give the property. The lower insulating sheet 23b is a roll
And a function of maintaining insulation between the lower surface of the conductive container 18 and the upper surface of the bottom wall 21a of the conductive container 18.

The second through hole 22a is formed by projecting an upper short tube 22b upward at the center of the lid 22, and after the upper insulating tube portion 24a is fitted into the upper end of the upper short tube 22b, the hollow tube 18a is formed. By deforming and fitting the upper end of the small diameter portion 18b, the lid 22 is electrically insulated from the hollow tube 18 and the battery 11 is provided with airtightness. The upper insulating sheet 24b is interposed between the lid 22 and the conductive container 21, and is deformed by folding the outer peripheral edge of the container 21,
It has a function to insulate the outer peripheral edge of the container 21 from the outer peripheral edge of the lid 22 and to provide the battery 11 with airtightness.

The lower insulator 23a and the lower insulating sheet 2
3b, upper insulating cylinder 24a and upper insulating sheet 24
b is preferably formed of an electrically insulating material such as polypropylene or polytetrafluoroethylene (trade name: Teflon) having heat resistance. Although the lid is electrically insulated from the hollow tube and the container in this embodiment, the lid may be electrically insulated from either the hollow tube or the container. For example, the small-diameter portion of the conductive hollow tube may be formed to be longer than the upper insulating cylindrical portion, and the small-diameter portion may be deformed so as to wrap the upper insulator during press working, so that the small-diameter portion contacts the lid. . In this case, the lid is electrically connected to the hollow tube and is electrically insulated from the container. In addition, reference numeral 21d in FIG. 1 accommodates the roll body 17 in the container 21, closes the opening on the upper surface of the container 21 with the upper insulator 24 and the lid 22, and bends the upper peripheral edge of the container inward. A ring-shaped constricted portion for receiving the outer peripheral edges of the upper insulator 24 and the lid 22 is provided at the upper end of the hollow tube 18 with a first reference numeral 18d.
An insertion portion that can be inserted into the through hole 21b and that is formed in a size such that sufficient conductivity can be obtained by contact with the container 21.

A method of manufacturing the roll body 17 of the battery 11 configured as described above will be described. First, as shown in FIG. 3A, the base end of the positive electrode current collector 12 is fixed to the outer peripheral surface of the hollow tube 18 by spot welding or the like. Next, as shown in FIG. 3B, the separator 14 is folded back from substantially the center thereof and laminated so as to cover both surfaces of the base end portion of the negative electrode current collector 13. The laminated body 16 is formed by laminating on the positive electrode current collector 12 fixed to the outer peripheral surface. Next, the laminate 16 is wound around the outer peripheral surface of the hollow tube 18 in the form of a roll to produce the roll body 17. Here, the separator 14 is in contact with the outer peripheral surface of the positive electrode current collector 12 and in contact with the inner peripheral surface of the negative electrode current collector 13.
And the positive electrode current collector 12 in contact with the outer peripheral surface of the negative electrode current collector 13
And a second separator 14b in contact with the inner peripheral surface of the second separator 14b. The positive electrode current collector 12, the negative electrode current collector 13, and the separator 1
Each length of 4 is set so that the negative electrode current collector 13 is exposed on the outer peripheral surface of the roll body 17 and the separator 14 can ensure insulation between the negative electrode current collector 13 and the positive electrode current collector 12. . In particular, in order to obtain the maximum energy density of the battery 11, the outer peripheral end of the positive electrode current collector 12 is
Each length is preferably set so as to be located immediately below the outer peripheral end of the negative electrode current collector 13 across the first separator 14a (FIG. 2B) (FIG. 3B). The first at this time
The outer peripheral ends of the second separators 14a and 14b slightly protrude from the outer peripheral ends of the positive electrode current collector 12 and the negative electrode current collector 13 to insulate the positive electrode current collector 12 and the negative electrode current collector 13 from each other. It is configured as follows.

In the battery 11 configured as described above, the conductive hollow tube 18 also serves as the positive electrode, and it is not necessary to shift the positive electrode current collector 12 and the negative electrode current collector 13 in the width direction. can do. The heat generated during charging or discharging is transferred to the through hole 18c of the hollow tube 18 and the container 21.
Is conveyed and diffused by air passing through the first through hole 21b and the outside of the container 21. As a result, the battery 11 is quickly cooled.

In this embodiment, a nickel-hydrogen secondary battery is described as a battery, but a nickel-cadmium secondary battery, a nickel-zinc secondary battery, a nickel-iron secondary battery, or other secondary batteries are used. May be. Here, in the case of a nickel-cadmium secondary battery, nickel hydroxide, cadmium and potassium hydroxide solutions are used as a positive electrode active material, a negative electrode active material, and an electrolytic solution, and in the case of a nickel-zinc secondary battery, As the positive electrode active material, the negative electrode active material and the electrolytic solution, nickel hydroxide, zinc and an aqueous solution of potassium hydroxide are used respectively. In the case of a nickel-iron secondary battery, the positive electrode active material, the negative electrode active material and the electrolytic solution are Nickel hydroxide, iron and potassium hydroxide aqueous solutions are used, respectively. Further, in this embodiment, the hollow tube and the container are formed in the shape of a square tube.
It may be formed in a pentagonal cylindrical shape or another polygonal cylindrical shape. When a battery having a complicated shape other than a cylinder is formed, a metal positive electrode substrate and a negative electrode substrate can be used to form a positive electrode current collector and a negative electrode current collector at a portion having a small radius of curvature (near a vertex of a bending angle). Cracks are generated, and burrs are formed on the positive electrode substrate and the negative electrode substrate along with these cracks. Further, there is a problem that the burrs easily cause a short circuit between the positive electrode current collector and the negative electrode current collector. In order to prevent these problems, it is preferable to use the nonwoven fabric of the conductivity-imparting polypropylene-polyethylene copolymer described in the above embodiment as the positive electrode substrate and the negative electrode substrate.

In this embodiment, a roll is formed so that the positive electrode current collector is exposed on the inner peripheral surface and the negative electrode current collector is exposed on the outer peripheral surface, and the hollow tube is brought into contact with the positive electrode current collector. , The container was brought into contact with the negative electrode current collector, but the positive electrode and the negative electrode were reversed,
That is, a roll body is formed such that the negative electrode current collector is exposed on the inner peripheral surface and the positive electrode current collector is exposed on the outer peripheral surface, the hollow tube is brought into contact with the negative electrode current collector, and the container is brought into contact with the positive electrode current collector. You may. Further, in this embodiment, air is mentioned as the refrigerant passing through the through hole of the hollow tube, but a gas such as an inert gas or a liquid such as water may be used.

FIG. 4 shows a second embodiment of the present invention.
4, the same reference numerals as those in FIG. 1 indicate the same parts. In this embodiment, the assembled battery 40 is configured by connecting a plurality of batteries 11 in series such that the through holes 18c and the first through holes 21b of these batteries 11 communicate with each other in a straight line. This assembled battery 40 is assembled as follows. First, the first battery 1
1a is placed so that the insertion portion 18d of the hollow tube 18 is located on the upper side. Next, the second battery is inserted into the insertion portion 18d of the first battery 11a.
The second battery 11b is stacked on the first battery 11a by fitting the first through hole 21b of the container 21 of the battery 11b.
Further, by inserting the first through hole 21b of the container 21 of the third battery 11c into the insertion portion 18d of the second battery 11b,
The battery 11c is stacked on the second battery 11b. Thus, a plurality of batteries 11a to 11c can be connected in series very easily. In the battery pack 40 configured as described above, by connecting a plurality of batteries 11 in series, the through hole 1 of each battery is connected.
8c and the first through hole 21b communicate with each other on a straight line, so that the heat generated during charging or discharging is reduced by the communicating through hole 18c.
The air is conveyed and dissipated by air passing through the first through hole 21b and air flowing along the outer peripheral surface of the conductive container 21.
As a result, the battery pack 40 is quickly cooled.

FIGS. 5 and 6 show a third embodiment of the present invention. 5 and 6, the same reference numerals as those in FIG. 1 indicate the same parts. In this embodiment, the assembled battery 60 includes a plurality of batteries 11 in the same plane, and the holes 11c of the through holes 18c of the conductive hollow tubes 18 are orthogonal to the plane and are adjacent to each other. Of each battery 1
1 is connected to the negative electrode of the battery 11 adjacent to this battery 11 via a connector 63, and the negative electrode of each of the batteries 11 is connected to the positive electrode of another adjacent battery 11 different from the adjacent battery 11. 63, and a first connecting member 63 that communicates with the connecting member 63 through the through hole 18c of each battery 11.
Second holes 72a communicating with the holes 71a and the first through holes 21b are respectively formed. The connection tool 63 is formed by pressing a metal plate such as Ni or Cu. This connection tool 63
Has the first hole 71a formed at one end and the second projection 72 formed at the other end with the second hole 72a. First
The hole 71 a is formed so as to be able to fit into the insertion portion 18 d of the battery 11, and the second protrusion 72 is formed so as to be able to be inserted into the first through hole 21 b of the battery 11.

The battery pack 60 is assembled as follows. First, the first hole 71a of the first connector 63a is fitted into the insertion portion 18d of the first battery 11a, and the second protrusion 72 of the first connector 63a is inserted into the first through hole 21b of the second battery 11b (FIG. 6). In this state, it is placed in a predetermined place so that the first connection tool 63a is on the lower side. This is referred to as a first temporary assembled battery 61. Next, the first hole of the second connector 63b is inserted into the third battery 11.
c, and the second protrusion of the second connector 63b is inserted into the first through hole of the fourth battery 11d (FIG. 5). In this state, it is placed adjacent to the first temporary assembled battery 61 so that the second connection tool 63b is on the lower side. This is referred to as a second temporary assembled battery 62. Next, the second protrusion 72 of the third connector 63c is exposed on the upper surface of the first temporary assembled battery 61 to the first through hole 2 of the first battery 11a.
1b, and insert the first hole 71a of the third connector 63c into the second hole 71a.
Of the fourth battery 11d exposed on the upper surface of the temporary assembled battery 62 (FIG. 5). In this manner, a plurality of batteries 11a to 11d can be connected relatively easily in series. In the assembled battery 60 configured as described above, even if a plurality of batteries 11 are connected in series by the connector 63, the first hole 71 is formed in the connector 63.
a and the second hole 72a, each hollow tube 1
8 and the first through hole 21b of each container 21 are respectively opened, and the heat generated at the time of charging or discharging is transferred to the second hole 72a, the first through hole 21b, the through hole 18c and the first hole 71a.
And the air flowing along the outer peripheral surface of the conductive container 21 is conveyed and dissipated. As a result, the assembled battery 6
0 is quickly cooled.

FIG. 7 shows a fourth embodiment of the present invention.
7, the same reference numerals as those in FIG. 3 indicate the same parts. In this embodiment, the conductive hollow tube 98 also serving as a positive electrode is formed into a cylindrical shape by extrusion or the like, and a large-diameter portion 98a inserted into the air core of the roll body and a large-diameter portion at the upper end of the large-diameter portion 98a. A small-diameter portion 98b is provided integrally with the diameter portion so as to coincide with the axis, and protrudes upward from the roll body. Large diameter part 98
The large-diameter portion is configured to be in contact with the positive electrode current collector 92 with the air core of the roll inserted into the outer peripheral surface thereof. Empty tube 98
Is physically joined to the outer peripheral surface of the substrate by spot welding or the like.
Reference numeral 98c is a through hole formed in the hollow body 98. Except for the above, the configuration is the same as that of the first embodiment.

A method for manufacturing the roll of the battery having the above-described structure will be described. First, as shown in FIG. 7A, the base end of the positive electrode current collector 92 is fixed to the outer peripheral surface of the hollow tube 98 by spot welding or the like. Next, as shown in FIG. 7 (b), the separator 94 is folded from substantially the center thereof to form the negative electrode current collector 93.
By laminating the negative electrode current collector 93 from the base end side so as to substantially cover both surfaces of the negative electrode current collector 93 to produce a partial laminate, and laminating this partial laminate on the positive electrode current collector 92, the laminate 9
6 is formed. Next, the laminate 96 is wound around the outer peripheral surface of the hollow tube 98 in a roll shape to produce a roll body. The positive electrode current collector 92, the negative electrode current collector 93, and the separator 9
Each length of 4 is set so that the negative electrode current collector 93 is exposed on the outer peripheral surface of the roll body, and the separator 94 can ensure insulation between the negative electrode current collector 93 and the positive electrode current collector 92. The operation of the battery pack configured as described above is substantially the same as that of the battery pack of the first embodiment, and therefore, the description thereof will not be repeated.

FIG. 8 shows a fifth embodiment of the present invention.
8, the same reference numerals as those in FIGS. 4 to 6 indicate the same parts.
In this embodiment, the battery pack 4 of the second embodiment is described.
A plurality of sets 0a to 40c are prepared as temporary assembled batteries, and these temporary assembled batteries 40a to 40c are in the same plane and the hole core of the through hole 18c of each conductive hollow tube 18 is orthogonal to the plane, Further, the batteries are arranged so that the polarities of the adjacent temporary assembled batteries 40a to 40c are reversed. The positive electrode of each of the provisionally assembled batteries 40a to 40c arranged as described above is
connecting member 6 to the negative electrodes of temporary assembled batteries 40a to 40c adjacent to
3 and the negative electrode of each of the temporary assembled batteries 40a to 40c is connected to the positive electrode of the adjacent temporary assembled batteries 40a to 40c different from the adjacent temporary assembled batteries 40a to 40c by a connector different from the connector 63. Connect via 63. Further, a first hole 71 communicating with the through hole 18c of each of the temporary assembled batteries 40a to 40c is formed in the connecting tool 63.
a and second holes 72a communicating with the first through holes 21b are respectively formed. The connection tool 63 is formed by pressing a metal plate such as Ni or Cu, etc., similarly to the connection tool of the third embodiment, and has the first hole 71a formed at one end and the first hole 71a formed at the other end. And a projection 72 in which two holes 72a are formed. The first hole 71a is the insertion portion 1 of the temporary assembled batteries 40a to 40c.
8d, and the second protrusion 72 is
0a to 40c are formed to be insertable into the first through holes 21b.

The battery pack 100 is assembled as follows. First, a plurality of batteries 11 are connected in series in the vertical direction to assemble a plurality of temporary batteries 40a to 40c. Next, the first temporary assembly battery 40a is attached to the second protrusion 72 of the first connection tool 63a.
Of the lower end of the second temporary assembled battery 40b into the first hole 71a of the first connector 63a.
Insert d. Further, a third temporary assembled battery is arranged next to the second temporary assembled battery, and the first hole 71a of the second connecting device 63b is inserted into the insertion portion 18d at the upper end of the second temporary assembled battery 11b.
The second protrusion 3b is inserted into the first through hole 21b at the upper end of the third temporary assembled battery 11c. In this manner, the assembled battery 100 can be assembled relatively easily by connecting the plurality of temporary assembled batteries 11a to 11c in series.

In the battery pack 100 configured as described above,
A plurality of batteries 11 are connected in series to form a temporary assembled battery 40a-4.
0c, and these temporary assembled batteries 40a to 40c are connected in series by the connector 63.
Since the first hole 1a and the second hole 72a are formed, the through hole 18c of each hollow tube 18 and the first through hole 21b of each container 21 are opened, and the heat generated at the time of charging or discharging is discharged to the second hole.
Hole 72a, first through hole 21b, through hole 18c, and first hole 71
a and the air flowing along the outer peripheral surface of the conductive container 21 of each battery 11 is conveyed and dissipated. As a result, the battery pack 100 is quickly cooled.

[0033]

As described above, according to the present invention, a laminate obtained by interposing a separator between a positive electrode current collector and a negative electrode current collector is used in a case where the positive electrode current collector has an inner periphery. Form a roll by winding it into a roll so that the negative electrode current collector is exposed on the surface and the outer peripheral surface, respectively, and insert the hollow tube into the air core of the roll so that the positive electrode current collector contacts the outer peripheral surface Then, the roll body was accommodated in a container so that the negative electrode current collector was in contact with the inner peripheral surface, the opening of the container was closed with a lid, and the container was electrically insulated from the hollow tube. The heat generated during the discharge is conveyed and dissipated by the refrigerant passing through the hollow tube and the refrigerant flowing along the outer peripheral surface of the conductive container. As a result, the battery is quickly cooled. Further, since the hollow tube also serves as the positive electrode, and there is no need to shift the positive electrode current collector and the negative electrode current collector in the width direction, the energy density can be higher than that of a conventional battery. Further, the laminate is wound into a roll so that the negative electrode current collector is exposed on the inner peripheral surface and the positive electrode current collector is exposed on the outer peripheral surface, respectively, to form a roll body, and the negative electrode current collector contacts the outer peripheral surface. A hollow tube is inserted into the air core of the roll body, the roll body is housed in the container so that the positive electrode current collector contacts the inner peripheral surface, the opening of the container is closed with a lid, and the container is further hollowed. Even if it is electrically insulated from the tube, the same effect as described above can be obtained. When the insertion portion at the tip of the hollow tube is protruded from the roll body and inserted into the first through hole, the plurality of batteries are connected in series so that the through hole and the first through hole communicate with each other in a straight line. Sometimes, each battery does not shift.

When a plurality of batteries are connected in series such that the through holes and the first through holes of these batteries communicate in a straight line, it is extremely easy to connect the plurality of batteries in series. The heat generated at the time of charging or discharging is conveyed and dissipated by the refrigerant passing through the communicating hole and the first through hole and the refrigerant flowing along the outer peripheral surface of the conductive container. As a result, the assembled battery is quickly cooled. Also, a plurality of batteries are arranged in the same plane and the holes of the hollow tubes are orthogonal to the plane, and the polarities of the adjacent batteries are opposite to each other. Is connected to the negative electrode of the battery adjacent to this battery via a connector, and the negative electrode of each of the batteries is connected to the positive electrode of another battery different from the adjacent battery via a different connector from the above-mentioned connector. A first hole and a first hole connected to a through hole of each battery.
By forming the assembled battery by forming the second hole communicating with the through hole, a plurality of batteries can be relatively easily connected in series through the connector, and the heat generated during charging or discharging is reduced to the second level. The refrigerant is conveyed and dissipated by the refrigerant passing through the hole, the first through hole, the through hole, and the first hole, and the refrigerant flowing along the outer peripheral surface of the conductive container. As a result, the assembled battery is quickly cooled.

Also, a plurality of batteries are connected in series so that the through holes and the first through holes of these batteries communicate with each other in a straight line, and a plurality of temporary battery assemblies are assembled. Inside, and the cores of the through holes of the respective conductive hollow tubes are arranged so that the polarities of the temporary assembly batteries adjacent to each other are orthogonal to the plane and the adjacent temporary assembly batteries have opposite polarities. The negative electrode of each temporary assembled battery is connected to the negative electrode of the temporary assembled battery adjacent to the temporary assembled battery via a connector, and the negative electrode of each temporary assembled battery is connected to the positive electrode of another adjacent temporary assembled battery. Connected through the fittings of
Further, the first hole and the first hole communicating with the through hole of each temporary assembled battery are connected to the connector.
If the second holes communicating with the through holes are respectively formed, the heat generated at the time of charging or discharging is transferred to the refrigerant passing through the second holes, the first through holes, the through holes and the first holes, or to the outer peripheral surface of the conductive container. It is carried and dissipated by the refrigerant flowing along it. As a result, the assembled battery is quickly cooled.

[Brief description of the drawings]

FIG. 1 shows a battery according to a first embodiment of the present invention, which is AA in FIG.
Line sectional view.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a process chart showing a part of a manufacturing procedure of a roll body.

FIG. 4 is a front view of a battery pack according to a second embodiment of the present invention, in which a plurality of batteries are stacked in a vertical direction and connected in series.

FIG. 5 is a plan view of a battery pack according to a third embodiment of the present invention, in which a plurality of batteries are arranged in the same horizontal plane and connected in series.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a process chart corresponding to FIG. 3 showing a fourth embodiment of the present invention.

FIG. 8 is a process chart of a battery pack showing a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Battery 12,92 Positive electrode collector 13,93 Negative electrode collector 14,94 Separator 16,96 Laminate 17 Roll body 18,98 Conductive hollow tube 18c, 98c Through hole 18d Insertion part 21 Conductive container 21a Bottom Wall 21b First through hole 22 Lid 22a Second through hole 40, 60, 100 Assembled battery 40a to 40c Temporary assembled battery 63 Connector 71a First hole 72a Second hole

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 2/30 H01M 2/30 C 10/50 10/50 // H01M 10/30 10/30 Z F term (Reference) 5H011 AA02 AA06 AA09 CC06 DD11 5H022 AA04 AA19 CC03 CC13 CC25 CC30 KK10 5H028 AA07 AA08 CC01 CC07 CC08 CC13 5H031 AA02 AA03 AA08 AA09 KK08 5H040 AA01 AA07 AA12 AA28 AS07 DD01 AT01 AT01 DD01 AT01 AT01 DD01

Claims (7)

[Claims] 1. A strip-shaped positive electrode current collector holding a positive electrode active material and a strip-shaped negative electrode current collector holding a negative electrode active material.
To prevent a short circuit of these current collectors (12, 13) and interpose a separator (14) holding an electrolyte to form a laminate (16), and further laminate the laminate (16). A roll body formed by winding in a roll shape such that the positive electrode current collector (12) is exposed on the inner peripheral surface and the negative electrode current collector (13) is exposed on the outer peripheral surface, respectively.
(17), a through hole (18c) through which a coolant can pass is formed in the center of the roll body (17) and inserted in the center of the roll body (17) so that the positive electrode current collector (12) contacts the outer peripheral surface. Conductive hollow tube also serving as positive electrode (18)
The roll body (17) is accommodated so that the negative electrode current collector (13) is in contact with the inner peripheral surface, and the bottom wall (21a) is inserted into the through hole (18c) of the conductive hollow tube (18). A conductive container (21) having a first through hole (21b) that can communicate with the conductive hollow tube (18) and serving as a negative electrode electrically insulated from the conductive hollow tube (18); and an opening of the conductive container (21). Block the conductive hollow tube (1
A second through hole (22a) through which the tip of 8) can be inserted or communicated is formed and is electrically insulated from one or both of the conductive hollow tube (18) and the conductive container (21). And a lid (22). 2. An insertion portion (18d) formed at the tip of a conductive hollow tube (18) is projected from a roll body (17) and has a first through hole (21).
The battery according to claim 1, which is inserted in b). 3. A short-circuit between the strip-shaped positive electrode current collector holding the positive electrode active material and the strip-shaped negative electrode current collector holding the negative electrode active material is prevented, and the electrolyte is removed. A stacked body is formed by interposing a separator to be held, and the stacked body is formed by winding the stacked body in a roll shape such that the negative electrode current collector is exposed on the inner peripheral surface and the positive electrode current collector is exposed on the outer peripheral surface. And a conductive hollow tube serving also as a negative electrode, which is inserted into the air core of the roll body so that the negative electrode current collector comes into contact with the outer peripheral surface and has a through hole through which a coolant can pass at the center. A first through-hole is formed on the bottom wall of the roll body so as to be in contact with the positive electrode current collector, and the bottom wall has a first through-hole that can communicate with the through-hole of the conductive hollow tube; A conductive container serving also as a positive electrode electrically insulated from the empty tube; and before closing an opening of the conductive container. A lid formed with a second through-hole through which the tip of the conductive hollow tube can be inserted or communicated, and electrically insulated from one or both of the conductive hollow tube and the conductive container; Battery. 4. The battery according to claim 3, wherein an insertion portion formed at the tip of the conductive hollow tube protrudes from the roll body and is inserted into the first through hole. 5. A plurality of batteries (11) according to claim 1 or 2.
Are connected in series such that the through hole (18c) and the first through hole (21b) of these batteries (11) communicate with each other in a straight line. 6. A plurality of batteries (11) according to claim 1 or 2.
Are disposed in the same plane, and the holes (18c) of the conductive hollow tubes (18) are perpendicular to the plane and the polarities of the adjacent batteries (11) are opposite to each other. Then, the positive electrode of each battery (11) is connected to the negative electrode of the battery (11) adjacent to this battery (11) via a connector (63), and the negative electrode of each battery (63) is connected to the adjacent battery ( The connecting device is connected to the positive electrode of an adjacent battery (11) different from 11).
(63) and a first hole connected to the connector (63) through a through hole (18c) of each of the batteries (11).
(71a) and an assembled battery in which a second hole (72a) communicating with the first through hole (21b) is formed. 7. The assembled battery according to claim 5, wherein the assembled batteries are a plurality of temporary assembled batteries (40a to 40c), and these temporary assembled batteries (40a to 40c) are arranged on the same plane and each of the conductive hollow tubes (18). ) Of the through-holes (18c) are orthogonal to the plane and further adjacent to the temporary assembled batteries (40a to 40a).
c) Arrange the batteries so that their polarities are opposite to each other.
To the negative electrode of a temporary battery (40a to 40c) adjacent to the temporary battery (40a to 40c) via a connector (63), and the respective temporary batteries (40a to 40c). The negative electrode is connected to the positive electrode of another adjacent temporary assembled battery (40a to 40c) different from the adjacent temporary assembled battery (40a to 40c) via a connector (63) different from the connector (63). Further, a first hole (71a) communicating with the through hole (18c) of each of the temporary assembled batteries (40a to 40c) and a second hole ( 72a) are each formed battery.