Electrical connecting device for rechargeable electrochemical energy storage system
First Claim
1. An electrical connecting device for a rechargeable electrochemical energy storage system, the electrical device comprising a means of providing voltage equilibration between series-connected energy storage sub-units arranged in parallel strings.
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Abstract
The present invention is drawn to an electrical connecting device for rechargeable electrochemical energy storage systems, comprising at least two parallel strings, wherein each of the strings have at least two single cells in series. The electrical connecting device provides at least one non-terminal inter-string connection for the purpose of voltage equilibration between series-connected cells or units of cells of the same nominal voltage in parallel strings. The non-terminal inter-string connection may comprise a current-limiting element. A formula is provided for the characteristics of the current-limiting element, depending on voltage and capacity of the units within the electrochemical storage system. The device is based on low-cost electrical components. It decreases voltage differences between sub-units in different parallel strings and increases the reliability and cycle life of any rechargeable electrochemical energy storage system based on series and parallel connections. The device can be used in a modular way for a storage system of any size and complexity.
15 Citations
32 Claims
- 1. An electrical connecting device for a rechargeable electrochemical energy storage system, the electrical device comprising a means of providing voltage equilibration between series-connected energy storage sub-units arranged in parallel strings.
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8. A rechargeable electrochemical energy storage system consisting of:
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a. at least two parallel strings of series-connected energy storage sub-units; and
b. an electrical connecting device comprising a means of providing voltage equilibration between series-connected energy storage sub-units arranged in parallel strings. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification