JPH0312222Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in a thermal battery in which a large number of power generating cells and heat generating agents are laminated.

A thermal battery is a highly reliable battery capable of high voltage and large current discharge, using an inorganic salt electrolyte that is solid and non-conductive at room temperature, but melts and becomes conductive at high temperatures. This thermal battery does not self-discharge when stored at room temperature and can be stored for over 10 years.It is a reserve type battery that starts by igniting a heat generating agent built into the battery, and is a power generation cell. By alternately stacking the heating agent and the heating agent, there is an advantage that a compact battery can be obtained. For this reason, it has been put into practical use as a power source for various flying objects, including rockets, and as a power source for various emergencies.

Conventional technology In conventional thermal batteries, disk-shaped power generating cells and heat generating agents are alternately stacked, and after the cells are housed in a cylindrical container, pressure is applied to the laminate, and a disk-shaped sealing cap, which is a battery cover, is used to apply pressure to the stack. While applying pressure to the plate, the sealing plate was welded and sealed around the circumference of the bottomed cylinder. That is, it has been customary to seal the laminate in the same direction as the stacking direction of the laminate.

Problems that the invention aims to solve As mentioned above, in conventional thermal batteries, the power generating cells and the exothermic agent are disk-shaped, and they also exert pressure on the sealing plate. However, when trying to apply an optimal compression force to the power generation cell stack, the sealing position may shift.

Each power generation cell in the power generation cell stack is connected only by contact with the adjacent power generation cells via a current collector plate or via a heat generating agent that also serves as a current collector plate, so the stack is compressed. If the force was weak, electrical contact would be poor, causing a voltage drop, and heat conduction from the exothermic agent would be poor, resulting in poor voltage rise during activation.

Also, if you try to weld while applying pressure to the sealing plate, the jig for welding the sealing plate will become complicated.
The welding process was also complicated and had the disadvantage of frequent welding defects.

Means for Solving the Problems The thermal battery according to the present invention uses a prismatic plate-shaped power generation cell, a heat generating agent, and a prismatic battery container, and the power generation cell and heat generating agent are arranged in the axial direction of the prismatic container. The containers are stacked at right angles to each other and are housed in a compressed state on the inner surface of the container, and a sealing plate is disposed on the axial surface of the container.

Effects According to the present invention, the compressive force of the stacked body of the power generating cell and the exothermic agent is maintained by the inner surface of the battery container, and there is no need to apply compressive force when sealing the sealing plate by welding, making welding easy. As a result, there are no more welding defects.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 is a power generation cell consisting of a positive electrode cell, an electrolyte layer, and a negative electrode layer.The positive electrode layer is made of iron disulfide, the electrolyte layer is made of potassium chloride-lithium chloride eutectic salt, and the negative electrode layer is made of a lithium alloy. It is molded into a shape. 2 is an exothermic agent, which is a mixture of iron powder and potassium perchlorate powder molded into a plate shape by powder molding. The power generation cells 1 and the exothermic agent 2 are alternately stacked to form a laminate.

A positive electrode current collector plate 3 and a negative electrode current collector plate 4 are arranged at both ends of this laminate, and a compressive force of approximately 10 kg/cm ² is applied from above and below to the laminate through asbestos as a heat insulator. , insert this laminate into the prismatic battery container 5. The power generation cell 1 and the exothermic agent 2 are stacked at right angles to the axial direction of the prismatic container 5, and a compressive force is maintained by the inner surface of the prismatic container 5. Reference numeral 6 denotes a sealing plate serving as a battery cover, which is disposed on the opening surface of the prismatic container 5 in the axial direction, and is welded to the container at the peripheral portion 7 of the sealing plate. 8 is the positive terminal attached to the sealing plate,
Similarly, 9 is a negative terminal.

Effects of the invention This invention uses a prismatic plate-shaped power generation cell, a heat generating agent, and a prismatic battery container in a thermal battery in which a large number of power generating cells and a heat generating agent are laminated. The compression force was constant, and there was no change in the compression force depending on the welding position of the sealing plate. As a result, good contact between the power generating cell and the exothermic agent was maintained, and stable battery characteristics with little voltage drop were obtained. In addition, because the compression force was conventionally adjusted by adjusting the top and bottom of the sealing plate, the sealing position was likely to shift, resulting in welding defects in approximately 10% of batteries.
By implementing the present invention, there were no welding defects due to misalignment of the sealing position.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the thermal battery of the present invention. 1... Power generation cell, 2... Exothermic agent, 5... Battery container, 6... Sealing plate.

Claims (1)

[Claims for Utility Model Registration] A thermal battery in which a laminate in which prismatic plate-shaped power generation cells 1 and exothermic agents 2 having substantially the same shape as the power generation cells are alternately laminated is housed in a prismatic battery container 5. The power generation cell 1 and exothermic agent 2 are placed in a prismatic container 5.
A thermal battery characterized in that the cells are stacked at right angles to the axial direction of the cells and are housed in a compressed state on the inner surface of a container 5, and a sealing plate 6 is disposed on the axial surface of the container 5.