JP2007027045A - Liquid injection type battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized liquid injection type battery having a structure capable of arranging a rod-shaped ample sideways so that its side face faces an inner bottom part of an external case. <P>SOLUTION: The liquid injection type battery has the rod-shaped ample 9 containing electrolyte solution 8, a pair of lamination body surrounding the ample 9 and including power generation part 6, and a pair of spacers 14 in the bottomed cylinder-shaped external case 1. The ample 9 is arranged so that its side face part 9c faces the inner bottom part of the external case. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a small-sized injection type battery, and more particularly to an injection type battery having a structure in which an ampoule is placed horizontally.

A schematic longitudinal sectional view of a conventional typical injection type battery is shown in FIG. 5 (see Patent Document 1).
Reference numeral 21 denotes a metal bottomed cylindrical outer case, which is covered with a phenolic resin battery cover 23 provided with terminal pins 22a and 22b. Inside the exterior case 21, a metal pressing plate 24, a spacer 25 made of polyethylene resin, and a power generation unit 26 sandwiched therebetween are accommodated.

  The columnar laminate including the pressing plate 24, the spacer 25, and the power generation unit 26 is provided with a cavity 27 in the center. A cylindrical ampoule 29 in which an electrolytic solution 28 made of a perchloric acid aqueous solution is sealed is disposed vertically in the cavity portion 27 so that the bottom portion 29 b faces the inner bottom portion of the exterior case 21. Iron plates 30a and 30b are arranged above and below the cavity 27 so that the electrolyte does not leak outside. Lead wires 31 a and 31 b that connect the terminal pins 22 a and 22 b and the power generation unit 26 are arranged in the gaps between the outer case 21, the spacer 25, and the power generation unit 26. The gap between the outer case 21 and the pressing plate 24, the spacer 25, and the power generation unit 26, and the upper portion of the spacer 25 are filled with resin 32. Therefore, the iron plates 30 a disposed on the lead wires 31 a and 31 b and the upper portion of the cavity portion 27 are embedded with the resin 32, and the battery lid 23 is disposed on the resin 32 to seal the opening of the outer case 21.

  In this liquid injection type battery, the ampoule 29 collides with the iron plate 30b disposed on the bottom of the outer case 21 due to external impact, whereby the ampoule 29 is destroyed and the electrolyte solution 28 enclosed in the ampoule 29 flows out to the outside. A voltage is generated by flowing into the power generation unit 26 by centrifugal force due to the turning of the battery.

By the way, in recent years, there is a growing demand for small-sized liquid injection type batteries with a volume ratio of about 1/4 and a generated voltage of 1/5 compared to conventional liquid injection type batteries. For this reason, there is a demand for the development of a liquid injection type battery in which the number of cells constituting the power generation unit is small and the electrolytic solution is small.
However, in the conventional liquid injection type battery, the cavity 27 provided in the central portion of the laminate is vertically oriented so that the ampoule 29 faces the inner bottom of the outer case 21 as described above. In order to secure a space for arranging the ampoule 29, it is necessary to provide a spacer 25 on the upper portion of the power generation unit 26. Therefore, the height dimension of the battery cannot be made smaller than the height dimension of the ampoule 29.
JP 2003-68311 A

  Therefore, in order to solve the above problem, the present invention has a structure in which a columnar ampoule can be arranged horizontally so that its side faces the inner bottom of the outer case, thereby reducing the height. It aims at providing a small injection type battery.

  A first injection type battery of the present invention includes a columnar ampoule containing an electrolyte, a pair of laminated bodies including a power generation unit and a pair of spacers surrounding the ampoule in a bottomed cylindrical outer case. And the ampoule is arranged such that a side surface of the ampoule faces an inner bottom portion of the exterior case.

  A second injection type battery according to the present invention includes a columnar ampoule containing an electrolytic solution in a bottomed cylindrical outer case, and a laminate including a power generation unit having a hollow part for housing the ampoule. And the ampoule is arranged such that a side surface of the ampoule faces an inner bottom portion of the exterior case.

  A third liquid injection type battery of the present invention has a columnar ampoule containing an electrolytic solution, a cavity for housing the ampoule, and an opening communicating with the cavity in a bottomed cylindrical outer case. A laminate including a power generation unit and a spacer disposed in the opening, and the ampoule is disposed such that a side surface of the ampoule faces an inner bottom of the exterior case. And

Thus, by arranging the columnar ampule so that the side surface faces the inner bottom portion of the exterior case, the liquid injection type battery can be miniaturized regardless of the height of the ampule.
It is preferable that the inner bottom portion of the outer case has a protrusion in order to facilitate the destruction of the ampoule.
Since the electrolyte easily flows into the power generation unit, the spacer is preferably configured such that the center protrudes toward the ampoule.

  ADVANTAGE OF THE INVENTION According to this invention, a small liquid injection type battery with a low height can be provided by arrange | positioning a columnar ampoule sideways so that the side surface may oppose the inner bottom part of an exterior case.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a schematic longitudinal sectional view showing an example of the injection type battery of the present invention. FIG. 2 is a schematic cross-sectional view of the injection type battery of FIG.
Reference numeral 1 denotes a metal bottomed cylindrical outer case whose opening is covered by a phenolic resin battery cover 3 provided with terminal pins 2a and 2b.

  In the exterior case 1, a pair of substantially semi-cylindrical laminates made up of a power generation unit 6 and a pair of metal pressing plates 4a and 4b sandwiching the power generation unit 6 are accommodated. The pair of power generation units 6 are connected in series. Note that a pair of power generation units 6 can be connected in parallel depending on the size of the load. The power generation unit 6 is formed by laminating a plurality of single cells including, for example, a negative electrode using lead as an active material, a separator made of cellulose, and a positive electrode using lead dioxide as an active material. Each of the single cells and the pressing plates 4a and 4b constituting the laminated body is a substantially semicircular plate-like body.

  A pair of substantially semi-cylindrical laminates having a curved surface portion facing the inner surface of the outer case 1 and a flat portion on the side of the cavity 7 described later are arranged at a distance so that the flat portions face each other. A pair of spacers 14 is disposed between one end and the other end of the pair of stacked bodies. The spacer 14 has a surface with an arc-shaped cross section so as to protrude to the side facing the ampule 9 described later. For the spacer 14, for example, polyethylene resin or the like is used. A cylindrical ampule 9 in which an electrolytic solution 8 made of a perchloric acid aqueous solution is enclosed is disposed in the cavity 7 surrounded by the pair of laminated bodies and the pair of spacers 14.

The ampoule 9 is arranged horizontally in the cavity portion 7 so that the side surface portion 9c faces an iron plate 10b described later disposed on the inner bottom portion of the exterior case 1. Therefore, the upper part 9a and the bottom part 9b of the ampoule 9 face either one of the pair of spacers 14.
Thus, by arranging the ampoule 9 horizontally inside the pair of laminated bodies, it is not necessary to provide a spacer above the power generation unit as in the conventional case where the ampoule 9 is arranged vertically, and the battery The height dimension can be made smaller than the height dimension of the ampoule 9 (distance between the upper part 9a and the bottom part 9b). Further, as described above, the spacer 14 has its center projecting toward the ampoule 9, so that the electrolyte 8 that has flowed out of the ampoule 9 due to destruction of the ampoule 9 easily flows into the power generation unit 6 along the surface of the spacer 14. Become.

Iron plates 10a and 10b are arranged above and below the cavity 7 so that the electrolyte 8 does not leak to the outside. A protrusion 13 for breaking the ampoule 9 is provided on the iron plate 10 b at the inner bottom of the outer case 1.
In a liquid injection type battery having a conventional configuration in which ampules are installed vertically, the bottom of the ampoule collides with the protrusion due to an external impact and the ampoule is destroyed. If the outer diameter of the ampoule is reduced, the thickness of the bottom of the ampoule increases, so that the ampoule is not easily broken.

On the other hand, in the liquid injection type battery according to the present invention in which the ampule is placed horizontally, even if the outer diameter of the ampule 9 is reduced and the bottom portion 9b of the ampule 9 is thickened, the side portion 9c of the ampule 9 is caused by the external impact. The ampoule 9 is easily broken because it collides with the protrusion 13. Therefore, the battery can be further reduced in size by reducing the outer diameter of the ampule 9.
In FIG. 1, the ampule 9 is disposed in the cavity portion 7 so as to contact the projection portion 13, but if the side portion 9 c of the ampule 9 collides with the projection portion 13 due to external impact, the ampule 9 And the protrusion 13 may not be in contact with each other. For example, the ampoule 9 may be sandwiched between a pair of spacers 14, and the ampoule 9 and the protrusion 13 may be arranged apart from each other.

  A dimension adjustment plate 5 is disposed between the iron plate 10a and the pressing plate 4a. Lead wires 11 a and 11 b that connect the terminal pins 2 a and 2 b and the power generation unit 6 are arranged in the gaps between the outer case 1 and the laminate and the dimension adjustment plate 5. The resin 12 is filled in the gap between the outer case 1 and the laminate and the dimension adjusting plate 5 and the upper portions of the dimension adjusting plate 5 and the iron plate 10a. Therefore, the lead wires 11 a and 11 b and the iron plate 10 a are configured to be embedded with the resin 12. The resin 12 also serves to bond the battery lid 3 for sealing the outer case 1.

  In the above embodiment, the protrusion 13 for destroying the ampule 9 is provided. However, even if the protrusion 13 is not provided, the ampule 9 collides with the iron plate 10b disposed on the bottom of the cavity portion 7 by an external impact. Easily destroyed. Further, the pair of pressing plates 4 a and 4 b may have a taper such that the inside of the hollow portion becomes narrower as the distance from the power generation unit 6 increases. The electrolytic solution quickly and surely flows into the power generation unit 6 along the taper.

In the above embodiment, the spacer 14 has an arc-shaped surface so that the center protrudes toward the ampoule 9. That is, the spacer 14 is provided with a convex portion having a substantially semicircular cross section so that the center protrudes toward the ampoule 9. However, for example, the cross section of the convex portion may be a triangle or a trapezoid.
In the above embodiment, a cylindrical ampule is used, but the shape of the ampule may be a prismatic shape.

(Embodiment 2)
FIG. 3 shows a schematic cross-sectional view of the injection type battery in the present embodiment. The liquid injection type battery according to the present embodiment has a configuration in which one of the pair of spacers 14 in the liquid injection type battery according to the first embodiment occupies a laminated body including a power generation unit. Note that description of portions common to the first embodiment is omitted.

As shown in FIG. 3, a cylindrical laminate 6 a including a power generation unit is disposed in the outer case 1. The laminated body 6a has a cavity 7a provided at the center thereof and an opening 15 communicating with the cavity 7a. A cylindrical ampule 9 is accommodated horizontally in the hollow portion 7 a so that the side surface portion 9 c faces the inner bottom portion of the outer case 1. A spacer 14 is disposed in the opening 7a. The laminated body 6a is configured by laminating a single cell and a pressing plate in which a disc-shaped part (a part corresponding to the cavity 7a and the opening 15) is missing.
Thus, by arranging the ampoule 9 horizontally in the hollow portion 7a, it is not necessary to provide a spacer above the power generation unit as in the conventional case where the ampoule 9 is arranged vertically, and the battery is downsized. be able to.

(Embodiment 3)
FIG. 4 shows a schematic cross-sectional view of the injection type battery in the present embodiment. The injection type battery of the present embodiment has a configuration in which the laminate including the power generation unit occupies the portion where the pair of spacers 14 are arranged in the injection type battery of the first embodiment. Note that description of portions common to the first embodiment is omitted.

As shown in FIG. 4, a cylindrical laminated body 6 b including a power generation unit is disposed in the outer case 1. The laminated body 6b has a hollow portion 7b in the center, and a cylindrical ampule 9 is horizontally stored in the hollow portion 7b so that the side surface portion 9c faces the inner bottom portion of the exterior case 1. The laminated body 6b is configured by laminating a disk-shaped single cell having a portion corresponding to the cavity 7b and a pressing plate.
Thus, by arranging the ampoule 9 horizontally in the cavity 7b, there is no need to provide a spacer above the power generation unit as in the conventional case where the ampoule 9 is arranged vertically, and the battery is downsized. be able to.

Example 1
Hereinafter, embodiments of the present invention will be described in detail.
The same injection type battery A of the present invention as in FIG. 1 was prepared.
The outer case 1 was made of iron with a bottomed cylindrical shape (outer diameter: 20 mm, height: 13 mm). The spacer 14 made of polyethylene resin (height: 10 mm, maximum dimension in the axial direction of the ampoule 9: 1.2 mm) was used. A perchloric acid aqueous solution was used as the electrolytic solution 8 sealed in the ampule 9 (outer diameter: 9 mm, height: 17 mm).

  A substantially semicircular plate-shaped single cell was constructed using a positive electrode using lead dioxide as an active material, a negative electrode using lead as an active material, and a cellulose separator. Seven such single cells were stacked and connected in series to form a power generation unit 6. And the electric power generation part 6 was pinched | interposed with a pair of pressing board 4a, 4b, and the substantially semi-cylindrical laminated body (diameter: 20 mm, height: 10 mm) was formed.

<< Comparative Example 1 >>
The same conventional injection type battery B as that shown in FIG. 5 was prepared.
The outer case 21 was made of iron with a bottomed cylindrical shape (outer diameter: 20 mm, height: 22 mm).
A cell was configured using a donut-shaped electrode plate and a separator, and the seven cells were stacked and connected in series to form a power generation unit 26. And the electric power generation part 26 was pinched | interposed with the pressing plate 24 and the spacer 25, and the laminated body (diameter: 20 mm, height: 20 mm) which has a cylindrical hollow part in the center part was formed. And the ampoule 29 which enclosed the electrolyte solution 28 similar to an Example was accommodated vertically in the exterior case.

[Battery evaluation]
Next, a discharge test was performed using the battery A of Example 1 of the present invention and the battery B of Comparative Example 1.
At normal temperature, the battery was swirled at a rotation speed of 10,000 rpm or 25000 rpm, and the ampoule was broken. Then, the behavior of the voltage generated by the electrolyte flowing out from the ampoule flowing into the power generation unit and whether the duration was 10 s or more were examined. The duration was the time from when the ampoule was destroyed until the voltage dropped below 5V. The load current at this time was 20 mA, and the number of battery tests was five. Further, when there was no sudden voltage drop of 1 V or more during discharging, it was determined that the voltage behavior during discharging was normal. The test results are shown in Table 1.

From Table 1, it was found that the battery A of the present invention is about half the size of the conventional battery B, but excellent discharge characteristics similar to those of the conventional battery B can be obtained.
In this example, the injection type battery having the same structure as that of the first embodiment was used. However, the same effect as that of this example can be obtained in the case of the injection type battery having the same structure as that of the second and third embodiments.

  Since the injection type battery of the present invention can reduce the battery size, it is preferably used as a power source for a small flying object.

It is a schematic longitudinal cross-sectional view which shows the injection type battery in Embodiment 1 of this invention. It is a schematic cross-sectional view of the injection type battery of FIG. It is a schematic cross-sectional view of the injection type battery in Embodiment 2 of this invention. It is a schematic cross-sectional view of the injection type battery in Embodiment 3 of this invention. It is a schematic longitudinal cross-sectional view of the conventional injection type battery.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,21 Exterior case 2a, 2b, 22a, 22b Terminal pin 3, 23 Battery cover 4a, 4b, 24 Holding plate 5 Size adjustment plate 6, 26 Power generation part 6a, 6b Laminate body 7, 27 Cavity part 8, 28 Electrolyte 9, 29 Ampoule 9a, 29a Upper part 9b, 29b Bottom part 9c Side part 10a, 10b, 30a, 30b Iron plate 11a, 11b, 31a, 31b Lead wire 12, 32 Resin 14, 25 Spacer

Claims (6)

In a bottomed cylindrical outer case, comprising a columnar ampoule containing an electrolyte, a pair of laminates including a power generation unit and a pair of spacers surrounding the ampoule,
4. The liquid injection type battery according to claim 1, wherein the ampoule is disposed such that a side surface of the ampoule faces an inner bottom portion of the outer case. In a cylindrical outer case with a bottom, a columnar ampoule containing an electrolyte solution, a hollow part containing the ampoule, and a laminate including a power generation part,
4. The liquid injection type battery according to claim 1, wherein the ampoule is disposed such that a side surface of the ampoule faces an inner bottom portion of the outer case. A cylindrical ampoule with a bottom, a columnar ampoule containing an electrolyte, a cavity for housing the ampoule, an opening communicating with the cavity, a laminate including a power generation unit, and the opening And a spacer disposed on,
4. The liquid injection type battery according to claim 1, wherein the ampoule is disposed such that a side surface of the ampoule faces an inner bottom portion of the outer case.
Injection battery.   The liquid injection type battery according to any one of claims 1 to 3, further comprising a protrusion on an inner bottom portion of the outer case.   The liquid injection type battery according to claim 1 or 3, wherein the spacer is convexly formed on the ampoule side. The injection type battery according to claim 5, wherein a cross section of the convex portion is substantially semicircular, triangular, or trapezoidal.

Images