JP2823647B2 - Protective device for stationary high temperature battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a group of a plurality of batteries operating at a high temperature using a solid electrolyte or a molten salt electrolyte such as a sodium-sulfur battery and a sodium-iron chloride battery. The present invention relates to a protection device for a stationary high-temperature battery.

(Prior Art) Conventionally, a high-temperature battery, for example, a sodium-sulfur battery operated at a high temperature of 300 to 350 ° C., is connected in series or in parallel with a plurality of cells and stored in a heat-insulating high-temperature battery storage container. It is used as a large-capacity stationary battery.

In order to cope with abnormal overheating due to chemical reaction, the high temperature battery container is melted and damaged due to breakage of the solid electrolyte during battery operation and abnormal rise in battery temperature due to high rate charging and discharging. Means have been taken to release the activator toward the high-temperature battery container to suppress the reaction and calm down.

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional method for coping with abnormal overheating due to a chemical reaction of a high-temperature battery, a particulate matter such as sand or glass or a powdery substance is used instead of using a gaseous substance as an inert agent. It has been known that the use of is more reliable and quicker to suppress and sooth.

Therefore, when an abnormal overheating occurs due to a chemical reaction in the high-temperature battery storage container, a granular or powdery inert agent is mainly released from the upper portion of the battery storage container, and the battery storage container is completely buried. However, since granular or powdery materials have fluidity, as shown in FIG. 5, for example, the ceramic particles should have a repose angle of 20 degrees, and the deironed sand should have a repose angle of 45 degrees. The problem is that the granular or powdery inert agent flows, and a considerable amount of inert agent is required to bury the battery container, which increases the size of the device itself and takes a long time to bury the device. was there. Further, there is a risk that the fluidized inert agent spreads around the battery container and contaminates the periphery.

(Means for Solving the Problems) The present invention solves the above-mentioned problems, and does not increase the size of the device, and causes an abnormality due to a chemical reaction accompanying the outflow of the active material when the high-temperature battery and the high-temperature battery container are damaged. It is designed to deal with abnormal situations of high-temperature batteries, such as suppressing overheating, soothing, and preventing the effects of abnormal overheating on adjacent members or adjacent high-temperature battery storage containers. A protective device for a stationary high-temperature battery in which a discharge port of a granular or powdery inert agent is disposed at an upper portion and which releases the inert agent when the high-temperature battery storage container is abnormally overheated and buries the high-temperature battery storage container. The protective device for a stationary high-temperature battery according to any one of claims 1 to 3, wherein a cover for preventing outflow of an inert agent is provided around a side surface of the high-temperature battery storage container.

(Embodiment) Hereinafter, the present invention will be described using the illustrated protection device as an embodiment.

First, FIG. 1 is a sectional view of a main part of an embodiment of the protection device of the present invention, in which a granular or powdery inert material made of zeolite, molecular sieve, glass, sand, or the like is provided above a high-temperature battery container (1). An inert agent tank (3), which is filled with an agent and has an inert agent discharge port (6) at the bottom, is provided. The member indicated by reference numeral (4) in the figure provided on the inert agent tank (3) is a test stopper plate, and the member indicated by reference numeral (5) is an open valve that opens when the inert agent is discharged and falls. is there. On the other hand, around the side surface of the high-temperature battery storage container (1), an inert agent outflow preventing cover (2), that is, the inert agent released from the inert agent tank (3) receives the inert agent outflow preventing cover (2). A wall-shaped cover is provided at the bottom so as not to flow or spill out to the outside of 2), and is somewhat higher than the height of the high-temperature battery storage container (1). Here, the distance between the wall-shaped cover for preventing inert agent outflow (2) and the side surface of the high-temperature battery storage container (1) is determined by the heat insulating effect of the inert agent filled therein. It is desirable to set the distance to be short enough that the radiant heat does not affect the peripheral members such as the storage container in order to reduce the amount of the inert agent used and to make effective use of the space. For example, when sand (ceramic particles) having a thermal conductivity of 0.16 Kcal / cm · K · sec is used as an inert agent, as shown in FIG. Heat to surface temperature 27
Insulation and reduction can be achieved up to about 0 ° C., and the effect of radiant heat on peripheral members can be sufficiently suppressed. Further, a member indicated by reference numeral (7) in the figure disposed above the high temperature battery storage container (1) is an inert agent impact pressure buffer plate having a large number of inert agent drop holes (8). As a preferred embodiment, as shown in FIG. 3a (top view) and FIG. 3b (side sectional view), the hanging member (7a) It is conceivable that the cover is attached so that it can be suspended on the inert agent preventing cover (2).

(Function and Effect) In the case where the high temperature battery or the high temperature battery container (1) is abnormally overheated due to a chemical reaction, the test stopper plate (4) and the release valve (5) are configured as described above. The inert agent which has been opened and filled in the inert agent tank (3) is discharged from the discharge port (6), falls, and the high temperature battery container (1).
, The abnormal overheating is suppressed and calmed down, and the influence of the abnormal overheating does not spread to the surroundings due to the formation of a heat insulating layer of an inert agent. Further, since the cover (2) for preventing outflow of the inert agent is provided around the side surface of the high-temperature battery storage container (1), the inert agent does not flow out of the cover (2) and does not stain the periphery. . Also, the upper and lower sides of the high temperature battery container (1) are uniform with a minimum amount of inert agent (about 1/10 to 1/50 of the amount when the cover for preventing inert agent spillage (2) is not used). It is possible to form a heat insulating layer having an appropriate thickness.

Further, when the deactivator impact pressure buffer plate (7) is disposed above the high-temperature battery storage container (1), the deactivator is supplied to the buffer plate (7).
Since it falls evenly from the drop hole (8) drilled in the hole, direct impact on the high-temperature battery storage container (1) can be reduced,
It is safe. When such a protection device is incorporated in the control device shown in FIG. 4, for example, it is possible to quickly deal with abnormalities of the high-temperature battery or the high-temperature battery storage container, and the reliability as a large-capacity stationary battery device is further improved. . In this figure, the abnormality detection device for the high-temperature battery or the high-temperature battery storage container is the accident sensor (9), but it is also possible to detect an abnormality with, for example, a temperature sensor, a current, or a voltage sensor.

As described above, the present invention greatly contributes to industrial development as a protection device for a stationary high-temperature battery that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a stationary high-temperature battery protection device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the thickness of sand (heat insulation layer) and surface temperature, and FIG. Top view of buffer plate, No.
FIG. 3b is a side cross-sectional view, FIG. 4 is a system diagram incorporating the stationary high-temperature battery protection device of the present invention, and FIG. 5 is a cross-sectional view for explaining the effect of the present invention. (1): high-temperature battery storage container, (2): cover for preventing outflow of an inert agent, (3): tank for an inert agent, (6): outlet for an inert agent, (7): shock pressure buffer for an inert agent Plate, (8): Inert agent drop hole.

Claims (2)

(57) [Claims] A discharge port (6) for a particulate or powdery inert agent is disposed above the high-temperature battery storage container (1), and the inert agent is discharged when the high-temperature battery storage container (1) is overheated abnormally. And a cover (2) for preventing outflow of an inert agent around a side surface of the high-temperature battery storage container (1). A protection device for a stationary high-temperature battery. 2. An inert agent impact pressure buffer plate having substantially the same shape as the high-temperature battery container (1) having a large number of inert agent drop holes (8) formed above the high-temperature battery container (1). The protection device for a stationary high-temperature battery according to claim 1, wherein 7) is provided.