JPH0312223Y2 - - 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.

Prior Art A conventional thermal battery uses a disc-shaped power generation cell and a heat generating agent, and a laminate in which these cells are alternately stacked is housed in a cylindrical container. That is, the shape of the thermal battery was cylindrical, and the power generation cell stack inside was also cylindrical.

Problems that the invention aims to solve Conventional thermal batteries, in which a disc-shaped power generating cell and a heat generating agent are laminated, have the drawback of having little freedom in the shape of the battery. That is, thermal batteries for large current discharge require a large active area, so the diameter of the power generation cell is large, and the diameter of the battery container is also large. Because high-voltage thermal batteries have a large number of laminated layers, the height of the battery inevitably increases.

Means for Solving the Problems The present invention provides a thermal battery with a well-balanced diameter and height by using rectangular power generating cells, and the rectangular power generating cells and heat generating agent are alternately connected. In a thermal battery in which a laminate is housed in a cylindrical container, the laminate is arranged such that the stacking direction is perpendicular to the axial direction of the cylindrical container.

According to the present invention, unlike conventional disc-shaped cells,
By changing the height of the cylindrical container, the length of one side of the rectangular power generation cell can be changed, and a thermal battery with an active area depending on the discharge current can be constructed. In addition, the diameter of the cylindrical container can be changed and the number of laminated layers can also be changed, increasing the degree of freedom in thermal battery design.

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

In FIG. 1, 1 is a laminate consisting of a power generation cell 3 and a heat generating agent 4, and 2 is a cylindrical container made of stainless steel. An arrow 5 indicates the axial direction of the cylindrical container, and the laminate 1 is laminated in a manner perpendicular to this axial direction.

FIG. 2 is a longitudinal cross-sectional view of the thermal battery of the present invention. The power generation cell 3 consists of a positive electrode layer, an electrolyte layer, and a negative electrode layer. The positive electrode layer is iron disulfide, the electrolyte layer is potassium chloride-lithium chloride eutectic salt, and the negative electrode The layer consists of a lithium alloy. The exothermic agent 4 is formed by powder molding a mixture of iron powder and potassium perchlorate powder. The power generation cells 3 and the exothermic agent 4 are alternately stacked to form a laminate 1. By changing the length of the cylindrical container 2 in the axial direction, the length of one side of the laminate 1 can be changed. 6 is a positive electrode current collector plate, and 7 is a negative electrode current collector plate. 8 is an ignition ball, and 9 is an ignition terminal. 10 is a battery cover with terminals attached to stainless steel through glass.
The periphery of the cylindrical container 2 is sealed by arc welding, and 11 is a heat insulating material.

FIG. 3 is a cross-sectional view of the thermal battery of the present invention. By changing the diameter of the cylindrical container, the laminate 1
The number of laminated layers can be changed, and the length of the other side of the laminate 1 can be changed.

Effects of the Invention The present invention provides a thermal battery with a high degree of freedom in design by employing a rectangular power generating cell and a cylindrical container in a thermal battery in which a power generating cell and a heat generating agent are laminated. In the design of thermal cells for high current discharge, the active area of the cell can be varied by changing the height as well as the diameter of the container, so that a thermal cell with a balance of diameter and height can be obtained. Manufacturable. In particular, it has become easier to manufacture low-voltage, high-current thermal batteries, which were previously difficult to manufacture.

Note that in the case of a laminate consisting of a rectangular power generation cell and a heat generating agent, a rectangular parallelepiped container can also be used, but the disadvantage is that it is difficult to weld the corners when sealing the container and the lid, resulting in many welding defects. It was hot. Furthermore, compared to cylindrical containers, rectangular parallelepiped containers require a more complicated manufacturing process and are more expensive, and have lower strength against increases in internal pressure, resulting in poor dimensional accuracy.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the insertion direction of the laminate in one embodiment of the thermal battery of the present invention, Fig. 2 is a longitudinal cross-sectional view showing one embodiment of the thermal battery of the present invention, and Fig. 3 is a cross-sectional view of the same. It is. 1... Laminated body, 2... Cylindrical container.

Claims (1)

[Claims for Utility Model Registration] A thermal battery in which a laminate 1 in which rectangular power generation cells 3 and exothermic agents 4 are alternately laminated is housed in a cylindrical container 2, wherein the laminate 1 has a lamination direction that is parallel to the cylinder. A thermal battery characterized in that the thermal battery is housed in the cylindrical container 2 in a manner perpendicular to the axial direction of the cylindrical container 2.