Brown, Boveri & Cie Ag

Bbc Brown Boveri Ag

Botho Ziegenbein

Harald Reiss

Georg F Wahl

Bernd Jahnke

Franz Schmaderer

Henner Meinhold

Cord-Henrich Dustmann

Conrad Schmidt

Hans Kahlen

Gunther F Petri

Gunther Petri

The bypass element is connected in parallel with a single battery cell or a group of battery cells of a high-temperature storage battery including a plurality of series-connected electrochemical battery cells and is used both for balancing the charging state of undamaged battery cells and for the irreversible bypassing of destroyed cells which have failed with high impedance. The bypass element includes two series-connected semiconductor components, in particular semiconductor diodes, varistors or NTC resistances in each case having a different current/voltage characteristic or curve. In the event of potentiostatic overcharging of a battery cell, the first semiconductor component goes to low impedance so that the current flow necessary for charging further battery cells is determined only by the leakage current of the second semiconductor component. If a destroyed battery cell fails with high impedance, both semiconductor components break down and irreversibly short-circuit the cell with a low impedance.

Bypass element for safeguarding battery cells

A shunting element includes two terminal elements for bridging an electrical component, at least one semiconductor component, and at least one electrically conducting layer connecting the semiconductor component to the two terminal elements, the electrically conducting layer being alloyed with the semiconductor component to form a shorting element upon the passage of a current which increases the temperature in the electrically conducting layer and in the semiconductor component to a given value.

Shunting element

Insulating device for high and low temperatures with at least one insulating material, characterized by the feature that the insulating material is formed at least in part of total reflecting fibers.

Insulating device

Thermal insulation for placement in a gas-tight and at least partially evacuated space in a hollow chamber, including insulating material in fiber form, and at least one substance admixed to the insulating material for absorbing and/or scattering thermal radiation.

Thermal insulation

Varistor fuse element for protecting an electric circuit against overvoltages, including a thermal fuse, a varistor combined with the thermal fuse for for tripping the thermal fuse with joulean or ohmic heat losses of the varistor, first and second conductors for supplying current to the fuse element, and first and second switch contacts each being connected to a respective one of the conductors for bridging the varistor, the contacts being closed when the thermal fuse is tripped by the varistor.

Varistor fuse element

A shunting element includes first and second electrical terminals for shunting an electrical component, a semiconductor component, and at least two electrically conducting parts partly formed in springs being electrically conductingly connected between the semiconductor component and one of the electrical terminals, the terminals being connected to each other with a low resistance through the electrically conducting parts when a current flows which raises the temperature in the semiconductor component to a given value.

Thermal insulation with a double-walled housing, between the two housing walls of which an evacuated space is provided which contains at least one fiber-like insulating material which retards the heat flow between the two housing walls and is arranged perpendicularly to the temperature gradient. The insulating material is formed by glass fibers which are made of at least two different glass materials, and the modulus of elasticity of which remains large at temperatures above 400.degree. C.

High-temperature storage battery with a double-walled housing and insulating material between the housing walls. At least one storage cell as well as a heat sink is arranged in the interior of the housing. The cooling device for the storage cell is designed as a heat exchanger and at least one and preferably several storage cells are associated with each exchanger.

High-temperature storage battery

Thermal insulation, especially for high-temperature batteries, wherein the thermal insulation has at least one hermetically sealed cavity which contains insulating material, characterized by the feature that the cavity is evacuated and is completely filled with at least one very fine insulating material in powder form in such manner that at least one first region of the cavity can be loaded with full pressure over the area and at least one second region of the cavity has very low thermal conductivity, and that these two regions are arranged immediately adjacent to each other.

Growing community of inventors

Neckarsteinach, Germany

Botho Ziegenbein