Method for determining an overall loss of capacitance of a secondary cell

A capacity loss, secondary battery technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as damage

Active Publication Date: 2015-01-07
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The disadvantage of this method is that the aging process and the resulting total capacity loss are is determined under the circumstances
Furthermore, damage especially due to events such as large changes in state of charge is not considered
This results in a total capacity loss that is too small to reflect the actual situation

Method used

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  • Method for determining an overall loss of capacitance of a secondary cell
  • Method for determining an overall loss of capacitance of a secondary cell
  • Method for determining an overall loss of capacitance of a secondary cell

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Embodiment Construction

[0028]The two functions 3, 4 reflect two different boundary conditions A and B. In a first step, the secondary battery is operated under boundary conditions A from a first charge throughput a to a second charge throughput b. The boundary condition changes from A to B at the first endpoint value 5. The change from boundary condition A to B describes in this example a temperature change of 5° C. from the original operating temperature.

[0029] For the continuation under boundary condition B for the same capacity loss as the first end point value 5 of boundary condition A, an intersection point with the function for boundary condition B is determined. This point of intersection is now used as the second starting value 6 for the secondary battery operation under boundary condition B. The secondary battery is now operated under boundary condition B from the second charge throughput b to the third charge throughput c. The second charge flux b moves to the fourth charge flux b2 w...

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Abstract

The invention relates to a method for determining an overall loss of capacitance of a secondary cell, for example of an accumulator, which is brought about by ageing processes. The overall loss of capacitance is determined additively from partial losses of capacitance which are determined by means of various parameters from various functions. A partial loss of capacitance is determined under constant peripheral conditions. If the peripheral conditions change, the partial losses of capacitance follow one another directly, i.e. with respect to the same loss of capacitance. The interval of the respective charge throughput rate is shifted here. The overall loss of capacitance of a secondary cell can be extended to the overall loss of capacitance of a package composed of a plurality of secondary cells.

Description

technical field [0001] The present invention relates to a method for determining the reflective secondary battery A method for the total capacity loss of secondary batteries during the aging process. Background technique [0002] As the proportion of renewable energy sources in the electricity generation architecture increases, this results in fluctuations in the amount of electricity generated in the grid. This fluctuation must be equalized during the current generation in order to ensure system stability in the grid. [0003] Current fluctuations in the grid cannot be planned and in some cases are extremely severe. There is therefore a need for energy stores which are able to reduce overcurrents in the grid or to feed current into the grid in the event of insufficient current. [0004] Known options for storing or delivering electric current are secondary batteries, in particular rechargeable batteries or accumulators. It offers the possibility of storing electrical e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3651G01R31/3679G01R31/392G01R31/367G01R31/385
Inventor D.莫斯特W.韦丹兹H.沃尔夫施米特
Owner SIEMENS AG
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