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Adjustment of states of charge of battery cells

A battery cell, state of charge technology, applied to battery circuit devices, batteries, arrangement of multiple synchronous batteries, etc., can solve problems such as high power loss of batteries, premature aging of batteries, overload of battery cells, etc.

Active Publication Date: 2017-10-17
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has proven to be particularly disadvantageous in that it is not possible to achieve an energy equalization based on a parallel circuit in order to produce an equal state of charge between the individual battery cells.
A battery with such a parallel circuit of battery cells results in a higher power loss, which can also lead to premature aging of the entire battery
At the same time there is a risk of overloading the less powerful battery cells

Method used

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  • Adjustment of states of charge of battery cells
  • Adjustment of states of charge of battery cells
  • Adjustment of states of charge of battery cells

Examples

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Embodiment Construction

[0041] figure 1 Four parallel-connected battery cells 12 , 14 , 16 , 18 of a battery 10 are shown in a schematic circuit, wherein the positive poles of the battery cells (not shown) are electrically conductively connected by means of a busbar 20 . The negative poles of the battery cells 12 , 14 , 16 , 18 are accordingly electrically conductively connected via bus bars 22 . Each of the battery cells 12 , 14 , 16 , 18 has an internal resistance 24 and a voltage source 26 , as shown schematically according to the model diagram. The values ​​of internal resistance 24 and voltage source 26 result from the electrochemical properties of battery cells 12 , 14 , 16 , 18 taking into account the respective construction.

[0042] In the case of a parallel circuit of battery cells 12 , 14 , 16 , 18 , small voltage differences of voltage source 26 are already sufficient for a large compensating current to flow during installation. Not only does this create a dangerous condition, but it al...

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Abstract

The invention relates to a method for adjusting states of charge of battery cells which are electrically operated in a manner connected in parallel, having the following steps of: - determining the states of charge of the battery cells, - selecting those battery cells whose states of charge are intended to be adjusted according to a predefinable selection rule, - activating those battery cells which are adjusted using a semiconductor switch of the battery cells in each case, and deactivating the remaining battery cells using the semiconductor switches of the respective remaining battery cells, - adjusting the states of charge and monitoring the states of charge, and - ending the adjustment of the states of charge if a predefined state of charge is reached by the activated battery cells.

Description

technical field [0001] The invention relates to a method for regulating the state of charge of battery cells which are operated in parallel. The invention also relates to a device for the method and to a battery, in particular for use in a motor vehicle, having a plurality of battery cells electrically connected in parallel. Background technique [0002] Methods and devices for regulating the state of charge of battery cells operated electrically in parallel are basically known, so that no separate documentation is required for this. Such battery cells or batteries are usually used in high-voltage battery systems, for example in electrically driven motor vehicles and the like. In the case of electrically connected cells in series, it is known that a charge balancing of the cells is required in order to reduce the different states of charge of the cells connected in series in this way. This process is also known as balancing. For this purpose, in the case of electrically c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/48H02J7/00
CPCH01M10/4257H01M10/441H01M10/482H02J7/0024H01M2010/4271H01M2010/4278H01M2220/20Y02E60/10
Inventor M·辛特伯格B·海伦塔尔
Owner AUDI AG
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