JP2001093511A - Wound cylindrical battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of quickly filling an electrolyte in a wound cylindrical battery when manufacturing it. SOLUTION: A collector 20 comprises a positive electrode plate 21 and a negative electrode plate 24 both having a plurality of holes, and a separator 26 for separating both electrodes. The separator 26 is made of a material to allow penetration of the electrolyte. The hollowed wound core 12 is provided with a plurality of through holes 14, so that the electrolyte 35 filled in the central part 16 of the hollowed core 12 can pass the through holes 14 towards the collector 20, distributed through the small hoes 22, 25 of the positive and negative electrodes 21, 24, thus expediting the penetration of the electrolyte 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolled cylindrical battery in which a sheet-like positive electrode and a negative electrode are wound in a roll shape with a separator interposed therebetween, and these are placed together with an electrolytic solution in a battery container.

[0002]

2. Description of the Related Art As a power storage element for storing electricity such as a battery and a capacitor, for example, a wound cylindrical battery wound in a roll shape with a separator interposed between a sheet-like positive electrode and a sheet-like negative electrode is known. The method for injecting the electrolyte into the container of the wound battery will be described with reference to the following drawings. FIG. 7 is an explanatory view for injecting an electrolytic solution into a conventional battery container. Wound cylindrical battery 100
The current collector 105 is wound around a hollow core 101 and placed in a cylindrical container 110. The current collector 105 is formed of a sheet-like positive electrode 106 and a negative electrode 107, and these electrodes 106,
107 and a separator 108 for separating them. The separator 108 is formed of a material through which the electrolyte can penetrate.

When an electrolyte is injected into a cylindrical container 110, an injection tube 112 is inserted into a hollow portion 102 of a hollow core 101, and the electrolyte is injected from a tip nozzle 113 of the injection tube 112 as shown by arrows a and a. The electrolyte flowing into the cylindrical container 110 is separated from the upper and lower ends of the current collector 105 by the separators 108.
And penetrates between the positive electrode 106 and the negative electrode 107 as shown by arrows b.

[0004]

In this injection method, since the electrolytic solution only enters from the upper and lower ends of the current collector 105, the electrolytic solution entered from the upper and lower ends reaches the center of the current collector 105. There must be. However, the current collector 10
Since the distance from the upper and lower ends to the center is relatively long, it takes time to make the electrolyte penetrate the entire current collector 105, which makes it difficult to increase the productivity and increases the cost. Was.

Accordingly, an object of the present invention is to provide a technique capable of injecting an electrolytic solution without taking much time when manufacturing a wound cylindrical battery.

[0006]

In order to solve the above-mentioned problems, a first aspect of the present invention is a winding form having a structure in which a current collector is wound around a hollow core, placed in a cylindrical container, an electrolyte is injected, and closed with a lid. In a cylindrical battery, the current collector is composed of a positive electrode and a negative electrode in the form of a porous sheet, and a separator that separates these electrodes. A large number of through-holes are opened, and the electrolyte filled in the hollow portion of the hollow core is directed to the current collector through the through-holes, and is dispersed in the radial direction through the small holes of the positive electrode and the negative electrode. It is characterized in that it is configured to promote penetration.

The electrolytic solution is directed to the current collector through the through-hole of the hollow core, and is dispersed in the radial direction through the small holes of the positive electrode and the negative electrode of the current collector. For this reason, since the electrolytic solution can also penetrate from the central portion of the current collector, the electrolytic solution easily permeates the current collector. As a result, the electrolytic solution can permeate the entire current collector in a short time.

The second aspect is characterized in that the through-holes and the small holes of the positive and negative electrodes are arranged on a line extending radially outward from the center of the hollow core.

[0009] The through-holes and the small holes of the positive and negative electrodes are arranged on a line extending radially outward from the center of the hollow core, and the electrolytic solution is more efficiently dispersed radially through the small holes of the positive and negative electrodes of the current collector. Let it. For this reason, the electrolytic solution easily permeates the current collector, and the electrolytic solution can permeate the entire current collector in a shorter time.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a sectional view of a wound cylindrical battery according to the present invention. The wound cylindrical battery 10 includes a hollow core 12 and a current collector 2.
0 and the upper and lower plates 2
7 and 28 are attached, and the current collector 20 in this state is stored in the cylindrical container 30, the negative electrode 24 of the current collector 20 is connected to the bottom surface 31 of the cylindrical container 30 with a conducting wire 33. The liquid 35 is injected, and the positive electrode 21 of the current collector 20 is connected to a conducting wire 34a.
, 34b are connected to the lid 36, an insulating rubber 38 is fitted on the outer periphery of the lid 36, and the lid 36 and the insulating rubber 38 are
0 is attached to the upper end 32.

The hollow core 12 has a plurality of through holes 14 formed in a peripheral wall 13. The through-holes 14 are provided at the upper end of the hollow core 12 with four holes having a diameter d1 at circumferential intervals of 90 °, and having a diameter d2 below these holes at circumferential intervals of 90 °. , And four holes are formed at regular intervals in the order of diameters d3 to d7. By setting the diameter of the through holes 14... So as to gradually decrease from the upper end to the lower end of the hollow core 12, d1 is set to be the largest d1
7 is made the smallest. The reason why the diameters d1 to d7 are gradually reduced from the upper end to the lower end will be described in detail with reference to FIG.

The current collector 20 includes a positive electrode 21 in the form of a porous sheet.
, And a negative electrode 24 and a separator 26 separating the electrodes 21 and 24.
, A plurality of small holes 25... Are formed in the negative electrode 24, and the separator 26 is formed of a material through which the electrolyte 35 can penetrate.

The small holes 22 ... of the positive electrode 21 and the small holes 25 ... of the negative electrode 24 are located outside the center of the hollow core 12 so as to overlap with the through holes 14 ... of the hollow core 12. They are arranged on a line that extends in the direction. These small holes 22 ..., 25 ...
Are formed with diameters d1 to d7 in the same manner as the through holes 14... And are gradually opened from the upper end to the lower end.

The cylindrical container 30 has a bottom surface 31 at the lower end of the cylindrical shape.
The current collector 20 and the electrolytic solution 35 are accommodated by crimping the upper end 32 via the insulating rubber 38 on the upper end 32, and the negative electrode 24 of the current collector 20
Are connected to the bottom surface 31 by conducting wires 33. Lid 3
6 connects the positive electrode 21 of the current collector 20 to the conductive wires 34a,.
It is connected by.

FIG. 2 is an explanatory view of the current collector of the wound cylindrical battery according to the present invention. The current collector 20 includes a porous sheet-like positive electrode 21 and a negative electrode 24, and sheet-like separators 26, 26.
And the positive electrode 21, the separator 26, the negative electrode 24, and the separator 26 are stacked in this order and wound around the hollow core 12, whereby the positive electrode 21 and the negative electrode 24 are separated by the separator 26.

The positive electrode 21 has small holes 22.
7 is a porous sheet-like electrode in which the vertically arranged small holes 22 are formed in the longitudinal direction at pitches P1, P2,. Here, the pitch P of the small holes 22.
The reason why 1, P2... Are changed will be described. For example, by winding the positive electrode 21 around the hollow core 12, the winding diameter of the positive electrode 21 gradually increases. There is a risk of deviation from the 12 through holes 14. Therefore, small hole 22
.. by changing the pitches P1, P2,.
Are superimposed on the through-holes 14 of the hollow core 12.

The separator 26 is formed of a material that can insulate the positive electrode 21 and the negative electrode 24 from each other and that can penetrate the electrolyte 35.

The negative electrode 24 has a small hole 25 like the positive electrode 21.
.. Are vertically arranged in the order of diameters d1 to d7, and the vertically arranged small holes 25... Are formed in the longitudinal direction at pitches P1, P2. The reason why the pitches P1, P2,... Of the small holes 25 are changed is that, like the positive electrode 21, the small holes 25 are overlapped with the through holes 14 of the hollow core 12. .

FIG. 3 is a sectional view of an apparatus for injecting an electrolytic solution of a wound cylindrical battery according to the present invention (first embodiment). The electrolyte injection device 40 connects the inlet side of the supply pipe 42 to the electrolyte supply means 41, connects the injection pipe 45 to the outlet side of the supply pipe 42 via a swivel joint 43, and connects the injection pipe 45 via a bearing 50. To the main body 51 so as to be rotatable.
The gear 53 is attached to the upper part 46a of the first gear, the drive gear 54 is meshed with the gear 53, the drive gear 54 is attached to the drive motor 55, and the drive motor 55 is attached to the main body 51. The swivel joint 43 is connected to the injection pipe 45.
Is rotatably connected to the supply pipe 42.

The injection pipe 45 closes the lower end 46b and forms a plurality of holes 48 in the peripheral wall 47 through holes 14 in the hollow core 12.
It is a member opened in accordance with. Holes 48 are hollow core 1
As in the case of the two through holes 14, four holes of diameter d1 are opened at 90 ° intervals in the circumferential direction at the upper end side of the injection pipe 45, and holes of diameter d2 are circumferentially positioned below these holes. Four holes are formed at intervals of 90 °, and are formed at regular intervals in the order of diameters d3 to d7.

By setting the diameters of the holes 48... So as to gradually decrease from the upper end to the lower end of the injection pipe 45, d1 is maximized and d7 is minimized. Diameter d
By gradually decreasing 1 to d7 from the upper end to the lower end, it is possible to prevent a large amount of the electrolytic solution from flowing out from the holes 48 on the lower end side, and to allow the electrolytic solution to uniformly flow out from all the holes 48. .

Next, a method of injecting the electrolyte will be described. FIG.
(A), (b) is 1st injection explanatory drawing of the electrolytic solution of the wound cylindrical battery which concerns on this invention, (b) is bb sectional drawing of (a). In (a), the injection tube 45 of the electrolyte injection device 40 is inserted into the hollow portion 16 of the hollow core 12. At this time, the holes 48 of the injection pipe 45 are inserted into the through holes 1 of the hollow core 12.
Match to 4 ...

Next, the electrolytic solution is supplied from the electrolytic solution supply means 41 to the hollow portion 16 of the injection tube 45, and the hole 48 of the injection tube 45 is supplied.
... from the direction of the arrow. The diameter d1 of the hole 48...
(see FIG. 3) is gradually reduced, so that the electrolyte flows out from all the holes 48 uniformly. At the same time, the driving motor 54 rotates the driving gear 54 to
At the same time, the injection tube 45 is rotated as shown by the arrow.

In (b), four holes 4 of the injection pipe 45 are provided.
Even if 8 is shifted from the four through-holes 14 of the hollow core 12 by an angle θ, by rotating the injection pipe 45 as shown by the arrow, it flows out from the hole 48 of the injection pipe 45 as shown by the white arrow. The electrolyte can be guided to the through-holes 14 of the hollow core 12.

FIGS. 5 (a) and 5 (b) are diagrams for explaining the second injection of the electrolytic solution of the wound cylindrical battery according to the present invention. In (a), the electrolyte filled in the hollow portion 16 of the hollow core 12 passes through the through holes 14.
6 penetrate and pass through the small holes 22 of the positive electrode 21 and the small holes 25 of the negative electrode 24 and are dispersed outwardly of the current collector 20 as indicated by arrows.

Here, the through holes 14... And the small holes 22.
25 are overlapped, and the diameters d1 to d7 of these holes are
(See FIG. 1) is gradually reduced from the upper end to the lower end, so that the electrolyte filled in the hollow portion 16 of the hollow core 12 can flow out substantially uniformly from all the through holes 14. .

On the other hand, arrows from the lower end of the hollow core 12
As shown in the figure, the electrolyte wrapped around the outer periphery of the current collector 20 penetrates through the separators 26, passes through the small holes 22 of the positive electrode 21 and the small holes 25 of the negative electrode 24, and has an arrow. .. Enters into the center of the current collector 20.

In FIG. 2B, the electrolyte dispersed outside the current collector 20 as shown by the arrows penetrates into the separators 26 as shown by the arrows. On the other hand, the electrolytic solution that has entered toward the center of the current collector 20 as indicated by arrows.
Penetrate into the separators 26. Further, as described in the related art, the electrolytic solution also permeates between the positive electrode 21 and the negative electrode 24 from the upper and lower ends of the current collector 20 (only the lower end is shown) as shown by arrows.

Next, a second embodiment will be described. In addition,
The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 6 is a sectional view of an electrolytic solution injection device (second embodiment) for a wound cylindrical battery according to the present invention. The electrolyte injection device 60 has two holes 63... Of an injection tube 62 formed at 180 ° intervals in the circumferential direction.

Since the injection pipe 62 is rotated as shown by the arrow, the electrolysis flowed out from the holes 63 of the injection pipe 62 as shown by the white arrows without the need to make four holes as in the first embodiment. The liquid can be passed through the through-holes 14 of the hollow core 12. By reducing the number of holes 63 in the injection pipe 62, the strength of the injection pipe 62 can be increased and the durability can be increased. The number of holes in the circumferential direction of the injection pipe is not limited to two or four, but may be one or three, for example.

In the first embodiment, as shown in FIG. 1, the through holes 14... And the small size of the positive and negative electrodes 21 and 24 are formed on a line extending radially outward from the center of the hollow core 12. Hole 22 ...
., 25... Are described, for example, the through-hole 14
... and the small holes 22 ..., 25 ... of the positive / negative electrodes 21, 24 need not be arranged on the same line. Since the positive and negative electrodes 21 and 24 can be relatively roughly wound around the hollow core 12, productivity can be increased and cost increase of the wound cylindrical battery can be suppressed.

Also, as shown in FIG.
..., through-hole 14 of hollow core and positive and negative electrodes 21, 24
Of the small holes 22... 25 are gradually reduced from the upper end to the lower end, but the diameters d1 to d7 may be the same. Further, as shown in FIG.
Although the example in which the pitches P1, P2,... Of 2,..., 25 are sequentially changed has been described, the pitch may not be changed.

Further, as shown in FIG. 3, the example in which the lower end of the injection tube 45 is made the same thickness as the upper end has been described, but the lower end can be made thinner. Since it is possible to prevent a large amount of the electrolytic solution from flowing out from the lower end, it is possible to more uniformly flow out the electrolytic solution from the upper end to the lower end of the injection pipe.

Further, as shown in FIG.
8, through holes 14 in the hollow core and small holes 2 in the positive and negative electrodes
Although 25 has been described as an example in which diameters d1 to d7 are respectively adjusted, the diameters of the holes may be different.

[0035]

According to the present invention, the following effects are exhibited by the above configuration. In the first aspect, the electrolytic solution is directed to the current collector through the through hole of the hollow core, and is dispersed in the radial direction through the small holes of the positive electrode and the negative electrode of the current collector. For this reason, the electrolytic solution easily permeates the current collector, and the electrolytic solution can permeate the entire current collector in a short time. As a result, the productivity can be increased and the cost increase of the wound cylindrical battery can be suppressed.

According to a second aspect of the present invention, the through holes and the small holes of the positive and negative electrodes are arranged on a line extending radially outward from the center of the hollow core.
The electrolytic solution can be more efficiently radially dispersed through the small holes of the positive electrode and the negative electrode of the current collector. For this reason, the electrolytic solution easily permeates the current collector, and the electrolytic solution can permeate the entire current collector in a shorter time. As a result, the productivity can be further increased, and the cost increase of the wound cylindrical battery can be further suppressed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a wound cylindrical battery according to the present invention.

FIG. 2 is an explanatory diagram of a current collector of a wound cylindrical battery according to the present invention.

FIG. 3 is a cross-sectional view of an electrolyte injection device (first embodiment) for a wound cylindrical battery according to the present invention.

FIG. 4 is an explanatory view of a first injection of an electrolytic solution of a wound cylindrical battery according to the present invention.

FIG. 5 is an explanatory view of a second injection of an electrolytic solution of the wound cylindrical battery according to the present invention.

FIG. 6 is a sectional view of an electrolyte injection device (second embodiment) for a wound cylindrical battery according to the present invention.

FIG. 7 is an explanatory view of injecting an electrolytic solution into a conventional battery container.

[Explanation of symbols]

10: wound cylindrical battery, 12: hollow core, 14: through hole,
16 hollow part, 20 current collector, 21 positive electrode, 22, 25
... Small holes, 24 ... Negative electrode, 26 ... Separator, 30 ... Cylindrical container, 35 ... Electrolyte, 36 ... Lid.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Tabira 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Teruyuki Oka 1-1-10 Shin-Sayama, Sayama City, Saitama Prefecture Hong Within da Engineering Co., Ltd. (72) Inventor Satoshi Tabuchi 1-10-1, Shin Sayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Yasuhisa Saito 1-10-1, Shin Sayama, Sayama City, Saitama Prefecture Honda Engineering (72) Inventor Toritsu Kuwahara 1-10-1 Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. F-term (reference) 5H014 AA06 BB08 CC04 5H021 AA02 BB12 BB17 CC17 5H023 AA03 AS07 BB10 5H028 AA06 BB03 CC12

Claims (2)

[Claims] 1. A wound cylindrical battery having a structure in which a current collector is wound around a hollow core, placed in a cylindrical container, injected with an electrolyte, and closed with a lid. It consists of a negative electrode and a separator that separates these electrodes.This separator is made of a material that can penetrate the electrolyte, and the hollow core has a large number of through holes to fill the hollow part of the hollow core. A winding form characterized in that the electrolytic solution is directed to the current collector through the through-holes and is dispersed in the radial direction through the small holes of the positive electrode and the negative electrode so that the penetration of the electrolytic solution can be promoted. Cylindrical battery. 2. The wound cylindrical battery according to claim 1, wherein the through-holes and the small holes of the positive and negative electrodes are arranged on a line extending radially outward from the center of the hollow core.