JPH0216551B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a device for supporting and destroying an ampoule filled with an electrolyte in a liquid injection battery. As is well known, injection type batteries can withstand storage for many years and can be used by changing the battery from a sealed inactive state to an open state and injecting electrolyte when necessary, and glass ampoules filled with electrolyte. Some batteries have a built-in battery that is destroyed by external impact or other means when necessary, allowing the electrolyte to flow into the battery. The present invention relates to the latter improvement.
It used to be necessary to operate with an impact acceleration of around 1500G, but recently there has been a growing desire to expand the operating range, and there has been a strong desire for liquid injection batteries that can operate with even lower external impacts. Because of this background, the ampoule is easy to manufacture, highly reliable, and does not break due to shocks from normal handling such as transportation vibration.
This provides a structure that ensures that the ampoule is destroyed by a 900G impact. In the past, many attempts to break glass ampoules by impact have been proposed, and below are a few examples similar to the present invention. What is shown in Utility Model Application Publication No. 49-148423 is
The support article has a hollow truncated cone shape, and upon impact, this is inverted, forming an inverted truncated cone shape, and the glass ampoule is broken by the protrusion at the bottom of the receiver. The disadvantage of this method is that the metal supporting part will not flip unless there is a large acceleration of at least 1500 G. Furthermore, since truncated conical metal pieces are usually manufactured by means such as "squeezing", they also have the disadvantage that it is difficult to obtain uniform strength. A second attempt is shown in Japanese Utility Model Application Publication No. 42-3541. This idea involves holding a metal piece with a hole in the center and multiple radial hands against the surrounding wall, and the impact causes the metal piece to bend, detach from the wall, and fall down, creating an ampoule. It is destroyed by the protrusion on the bottom. Like the previous example, this idea also requires an acceleration of at least 1,500 G, and the method of holding the metal piece to the surrounding wall has a large effect on the fall of the metal piece, so it has the disadvantage of poor reproducibility. In the third and fourth attempts, as seen in Japanese Utility Model Application Publication No. 42-3542 and No. 42-3543, the electrolyte container, which is subjected to downward force due to impact, is composed of a plurality of flexible electrolyte containers. The flexible support legs are pushed apart, and the pedestal with the protrusion is pushed upward by the spring, destroying the electrolyte container. This design also requires an acceleration of at least 1500G to spread out multiple support legs, and if almost all support legs are not opened at the same time, the protrusion for destruction will not hit the bottom of the electrolyte container perpendicularly, making it unreliable. It was difficult to obtain high quality products. The present invention solves these conventional problems. This type of battery requires that the ampoule be reliably broken and operate under low acceleration, and that the battery must not be unnecessarily activated by normal shocks during transportation or handling. I have the above problem. The main object of the present invention is to obtain a liquid injection type battery that operates reliably with a low impact of 900G and whose glass ampoules can withstand damage during transportation and handling. Figure 1 is a cross-sectional view of a conventional injection type battery, in which a glass ampoule 4 filled with electrolyte 3 is positioned at the center of a stacked ring-shaped battery element 2 housed in a battery case 1. ampoule support plate 6 made of a ring-shaped metal spring plate. Further, this support plate 6 is placed on a pot-shaped ampoule holder 9 having a plurality of protrusions 7 on the inner side of the periphery and one ampoule breaking protrusion 8 on the bottom.
10 is an output terminal, and 11 is a spacer. When acceleration is applied to this battery in the upward direction shown by the arrow, the support plate 6 is bent and detached from the protrusion 7 below as shown in FIG. 2, and the ampoule 4 collides with the bottom protrusion 8 of the ampoule holder 9. to break it down and release the electrolyte. FIG. 3a shows a conventional ampoule support plate 6, and FIGS. 3b and 3c show examples of the support plate of the present invention. In example b, a thin plate 1 of synthetic resin, for example polypropylene, having the same shape as the spring plate 6 is placed above the metal spring plate 6.
In the example of c, a thin synthetic resin plate 1 having the same shape as the spring plate 6 is placed between the two metal spring plates 6.
3 sandwiched in a sandwich-like structure, each of which is mounted inside the battery instead of the conventional support plate consisting of a single metal spring plate as shown in FIGS. 2 and 3a. The effect of the combination of such a metal spring plate and a thin synthetic resin plate is as follows. FIG. 4 shows the relationship between the impact time applied to the battery and the acceleration G. Curves B and C are typical examples of the impact acceleration and impact time that an injectable battery receives when a flying object equipped with an injectable battery is fired (projected) from a gun, for example. C is an example of a general launch impact acceleration and impact time, and C is an example of a low launch impact acceleration, which has been in increasing demand recently. Although not shown in this figure, the upper limit of launch impact acceleration may exceed 25,000G.
In any case, the time for applying each maximum G is usually a relatively long time, such as 10 to 20 milliseconds. On the other hand, A shows the maximum impact pattern that can be applied to a liquid-injected battery during typical transportation, handling, etc., with a maximum value of just under 300G and an impact duration of less than a few milliseconds. In order to activate the battery with a low impact acceleration, a thin metal spring plate shown at 6 in FIG. 2, for example, may be used. However, in that case, there is an increased risk that the spring plate will fall off due to the power generated during transportation and handling, and the ampoule will break. The present invention is applicable to B or C as seen in FIG. 4A.
Impacts that last for a significantly shorter period of time can be absorbed by the impact-absorbing effect of the synthetic resin thin plate. The impact-absorbing effect of the thin synthetic resin plate is that it absorbs short-term impacts, but when the impact is applied over a long period of time as in B or C, the thin synthetic resin plate becomes compressed in a short period of time. After that, the shock is no longer absorbed, so it operates with almost no loss of impact energy. Specific examples of the present invention are shown below. Example 1 When a stainless steel spring plate with an outer diameter of 16.5 mm and an inner diameter of 6.5 mm is used alone, and when a polypropylene resin film with a top surface of 0.08 mm is used,
Table 1 shows the relationship between the spring plate thickness and the operating condition (the spring comes off the protrusion 7). Furthermore, Table-1
Activation means that the spring plate activates and the ampoule breaks, and it does not activate under transportation vibrations of 300G, but must work reliably under radiation shock of at least 900G.

[Table] Example 2 Stainless steel spring plate 2 with outer diameter 16.5 and inner diameter 6.5 mm
Table 2 shows an example in which a polypropylene film having the same shape is sandwiched between the sheets in a sandwich-like manner and used in combination (the thickness of the two spring plates were the same). In addition, "without polypropylene film" indicates a state in which only two spring plates are stacked on top of each other. Table 2 shows whether or not the spring plate was activated under each condition. The same effect can be obtained even if a phosphor bronze plate is used as the spring plate, and a polyamide film is used as the synthetic resin thin plate.

【table】

[Table] In Table 1, in the case of only a spring plate, it does not operate under 300G transport vibration, and the area that operates under 900G radial acceleration is only in the case of thickness 0.1, but in combination with polypropylene film, the spring plate Plate thickness 0.07~
The area is 0.1mm. Furthermore, in Table 2, in the case of only a spring plate, there is no region in which it does not operate with a transport vibration of 300G, and there is no region in which it operates with a radiation shock value of 900G, and in the case of a polypropylene film in the form of a sandwich
The thickness of two spring plates is in the range of 0.08 to 0.12 mm,
It is clear that superimposing a stainless steel leaf spring and a polypropylene film is effective. As a result, batteries that can be activated with a low radiation shock value can be made by thinning the metal spring plate, but in doing so, the risk of accidental activation due to vibration during transportation and handling is reduced. The resin film prevents this, and its effect is extremely large. The material and thickness of the synthetic resin film are not limited to those in this embodiment, and the combination with the metal spring plate can be changed depending on the required characteristics, such as simply overlapping or fixing them together.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional injection type battery, Fig. 2 is a cross-sectional view showing the positional relationship between the ampoule support plate and the cup-shaped ampoule receiver, and Fig. 3 a is a cross-sectional view of a conventional injection type battery. , c are side views showing the structure of the ampoule support plate of the present invention, and FIG. 4 is a diagram showing the relationship between the impact time applied to the battery and the acceleration G. DESCRIPTION OF SYMBOLS 1...Battery case, 2...Battery element, 4...Glass ampoule, 6...Ampoule support plate, 7...Protrusion, 8...Protrusion for destroying ampoule, 9...Cop-shaped ampoule holder, 12, 13 ...Synthetic resin thin plate.

Claims (1)

[Claims] 1. A glass ampoule containing an electrolyte located in the central cavity of the power generation element, a ring-shaped ampoule support plate supporting the ampoule, and a plurality of protrusions supporting the ampoule support plate around the periphery, and an inner bottom portion. The ampoule support plate is constructed by overlapping a metal ring-shaped spring plate and a thin synthetic resin plate of the same shape. type battery.