JPH0524128Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention converts a cylindrical power generating element into a cylindrical battery container with a polygonal cross section (hereinafter referred to as a prismatic battery container).
The present invention relates to a thermal battery housed in an external device, and provides a thermal battery that is easy to attach to external equipment and has good heat retention.

Prior Art Thermal batteries use a molten salt as an electrolyte, which is solid at room temperature. When heated to high temperatures, the electrolyte melts and exhibits extremely high conductivity, making it possible to discharge at a large current. A typical thermal battery is assembled by housing a cylindrical power generation element consisting of cells and a heat generating agent in a cylindrical container. Cells and exothermic agents, which are the power generation elements, are generally made by powder molding, so it is easy to make a circular shape.For cylindrical power generation elements, using a cylindrical container makes thermal design easier and improves the volumetric efficiency of the battery itself. .

Problems to be solved by the invention When a cylindrical container was used, there was a problem in the arrangement of the current collection lead wires from the power generation element. The space between the power generation element and the container is filled with insulation to keep it warm, but the insulation in that area was thin because of the lead wires. Lead wires are also good conductors of electricity and generally good conductors of heat. As a result, the insulation of the lead wire placement portion is poor, and in order to obtain sufficient heat retention, it is necessary to increase the diameter of the container.

Furthermore, when installing a thermal battery in a device, a cylindrical battery is disadvantageous in terms of space. That is, the mounting space is limited by the diameter of the cylindrical battery, so although the battery itself has a high volumetric efficiency, the space efficiency when mounted on a device is not good. Moreover, the cylindrical shape is not easier to attach to equipment than the rectangular shape.

Means for Solving the Problems The present invention solves the above problems by housing a cylindrical power generation element in a rectangular battery container, and placing leads for current collection in the wide space created by the ridges on the sides of the container. It is an arrangement of lines.

Function The thermal battery of the present invention uses a prismatic battery container, so it can be easily installed in equipment, and since the lead wire inside the battery is placed at the edge of the corner of the prismatic battery container, It has no negative effect on heat retention.

Example The invention will be explained below using preferred embodiments.

FIG. 1 is a cross-sectional view of a main part of a thermal battery which is an embodiment of the present invention. 1 is a cylindrical power generation element,
It is composed of a laminate of a plurality of disc-shaped cells and a heat generating agent. The cell uses iron disulfide as the positive electrode, a lithium alloy as the negative electrode, and LiCl-KCl eutectic salt as the electrolyte. The exothermic agent is a mixture of iron and potassium perchlorate. 2 is a rectangular battery container that houses the power generation element. 3 is a lead wire for current collection;
It is arranged in the space created between the edge part of the side surface of the square battery container 2 and the heat generating element 1. 4 is a heat insulating material for keeping the inside of the battery warm. The number of lead wires is usually two, a positive electrode and a negative electrode. If the number of power generation blocks is large by taking out the intermediate tap or storing a plurality of power generation blocks, they may be distributed over the angular ridge, or several power generation blocks may be placed one on top of the other. In the embodiment, a rectangular battery container with a rectangular cross section was used, but if a rectangular battery container with more angles is used, there will naturally be as many locations for lead wires as there are vertices of the polygon.

Effects of the invention In the thermal battery according to the invention, since the lead wire storage part does not affect the thickness of the insulation material, the thickness of the insulation layer on the side surface of the container only needs to be the minimum thickness that keeps the battery warm. The dimensions of can be reduced. Also, prismatic batteries are easier to store and fix in equipment than cylindrical batteries.

As described above, according to the present invention, it is possible to obtain a thermal battery that requires a small installation space in a device, is easy to install, and has excellent heat retention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a thermal battery according to the present invention. 1... Cylindrical power generation element, 2... Square battery container, 3...
Lead wire for current collection.

Claims (1)

[Scope of utility model registration request] A thermal battery characterized in that a cylindrical power generating element is housed in a cylindrical battery container having a polygonal cross section, and a lead wire for current collection is arranged in a wide space created by a ridge of the container.