JPH0357579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improvements in liquid fuel cells that use hydrazine, methanol, or the like as fuel.

Conventional technology Conventionally, in a liquid fuel cell, as a method of adjusting the temperature inside the cell, a cooler was provided outside the cell, and the air electrode was directly air-cooled using the cooler, thereby adjusting the temperature inside the cell to an appropriate level. The temperature was adjusted to the desired temperature.

Problems to be Solved by the Invention However, the air electrode performance, which is highly temperature dependent, has the disadvantage that the air electrode performance deteriorates faster than the battery temperature drops, and the provision of a cooler slows down the assembly process. They are complicated, have poor volumetric efficiency, require electrical control, which makes their operation complicated, and they are prone to breakdowns when used outdoors or when there is vibration, and they are expensive.

Means for Solving the Problems The present invention solves the above problems by inserting a thin piece of heat-sensitive material with high thermal conductivity into the battery, and exposing the remaining part to the outside of the battery as a heat dissipation fin. The heat dissipation fins are made to stand upright or tilt by utilizing the change.

Function By having the above structure, the highly thermally conductive flakes stand upright when the internal temperature of the battery is high and tilt when the temperature is low, making it possible to change the effective area that acts as a heat dissipation fin. The temperature of the battery body can be adjusted without directly cooling the high air electrode. Moreover,
Electrical control of a cooler or the like is not required, and battery production is simplified.

Example Next, one embodiment of the present invention will be described.

A thin piece of flexible graphite, which is a heat-sensitive material with high thermal conductivity, is inserted into the battery frame 1 and the remaining part is exposed at the top of the battery to serve as the heat dissipation fin 2.The anolite in the anolite tank 3 is circulated by the pump 4, and the anolite Bimetal 6 made of heat-sensitive material is placed in the liquid reservoir 5 provided at the discharge port.
, the protrusion 7 connects the metal wire 8 between the heat dissipation fins 2 to the bimetal 6, and the heat dissipation fin 2 is made to stand upright or tilt by utilizing the change in shape of the bimetal 6 that occurs when the anorite temperature is high or low. This is used to adjust the battery temperature. That is, when the battery temperature is high, the heat dissipation fins 2 stand upright and are cooled by the fan 9, and the battery frame 1 into which the heat dissipation fins 2 are inserted is cooled by heat conduction. On the other hand, when the battery temperature is low, the heat dissipation fins 2 are tilted and overlapped.
The air blown by the fan 9 cools only a portion of one surface of the heat dissipation fin 2, and the balance between heat generation and heat dissipation is shifted, resulting in an increase in battery temperature. As mentioned above, like the battery frame 1 in this embodiment, the battery temperature is adjusted through the inserted portion of the heat dissipation fin 2, so that the air electrode, which is highly temperature dependent, is not cooled. Cell temperature can be adjusted without reducing the performance of the poles.

In this embodiment, a thin piece of flexible graphite is used for the radiation fin 2, but a thin piece of metal such as amorphous metal may also be used. Further, as for the heat-sensitive material, for example, a shape memory alloy can also be used.

Effects of the Invention As described above, according to the present invention, since the air electrode can be prevented from being directly cooled, the battery temperature can be adjusted without reducing the air electrode performance, which is highly temperature dependent. Since no cooler is used to adjust the temperature inside the battery, battery production can be simplified, and this has great industrial value, such as contributing to cost reduction.

[Brief explanation of drawings]

FIG. 2 is an explanatory diagram of a liquid fuel cell according to the present invention in the drawings. 1 is a battery frame, 2 is a heat radiation fin, 6 is a bimetal, 7 is a protrusion, and 8 is a metal wire.

Claims (1)

[Claims] 1. It has a highly thermally conductive thin piece, a part of which is inserted inside the fuel cell and the remaining part works as a heat dissipation fin outside the cell, and the thin piece works in conjunction with a heat-sensitive material whose shape changes depending on the temperature. , a liquid fuel cell characterized by having a mechanism for regulating cell temperature by changing the shape of the material so that the flakes stand upright at high temperatures and tilt at low temperatures to reduce the effective area that functions as a heat dissipation fin. . 2. The liquid fuel cell according to claim 1, wherein the radiation fins are flexible graphite flakes. 3. The liquid fuel cell according to claim 1, wherein the heat radiation fin is a thin metal piece. 4. The liquid fuel cell according to claim 3, wherein the metal flake is an amorphous amorphous metal flake. 5. Claim 1, 2, or 3, characterized in that the heat-sensitive material is a bimetal.
The liquid fuel cell according to item 1 or 4. 6. The liquid fuel cell according to claim 1, 2, 3, or 4, wherein the heat-sensitive material is a shape memory alloy.