Method for connecting the cells of a battery, and associated battery system

Abstract

The present invention relates to a method for connecting a plurality of battery cells (21) of a battery (111) which is in the form of an electrochemical energy store, wherein the battery cells (21) are each electrically coupled to the battery (111) with a corresponding first probability P1i and are each electrically decoupled from the battery (111) with a corresponding second probability P2i. In this case, the battery cells (21) are connected to one another in series. In the method, a first quality factor Gi is calculated for each battery cell (21) depending on a state of charge LZi and on a state of ageing AZi of the corresponding battery cell (21). An average first quality factor G1, which corresponds to an average value of the first quality factors G1i of the battery cells (21), is also determined. Furthermore, a second quality factor G2i is calculated for each battery cell (21) as a linear, in particular monotonically increasing, function of the difference between the first quality factor G1i of the corresponding battery cell (21) and the average first quality factor G1. In this case, the corresponding first probability P1i and the corresponding second probability P2i are determined for each battery cell (21) in each case depending on the calculated second quality factor G2i of the corresponding battery cell (21).

Description

technical field [0001] The invention relates to a method for switching a plurality of battery cells of a battery configured as an electrochemical energy store. The invention also relates to a battery system with a battery configured as an electrochemical energy store, wherein the battery has a plurality of battery cells which each comprise a battery cell and are assigned to the battery Battery pack battery monitoring module for batteries. Background technique [0002] FIG. 1 shows a battery system 10 known from the prior art, which comprises a battery 11 with a plurality of battery cells (Smart Battery Units, SCUs) each having a battery cell 21 and a battery cell monitoring module (battery cell electronics module or battery cell electronics) 22 assigned to the battery cell 21 . To simplify the illustration in FIG. 1 , only two battery cells are shown and each assigned the reference numeral 20 . The battery cell monitoring module 22 enables individual control of the indivi...

AI Technical Summary

Problems solved by technology

This has the result that the states of charge of the battery cells 21 of the batteries 11 of the battery system 10 known from the prior art always differ from one another in the range of 0 to 5%.

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