Method for switching battery cells of a battery pack and associated battery pack system

Abstract

The invention relates to a method for switching a plurality of battery cells (21) of a battery (111) designed as an electrochemical energy store, wherein the battery cells (21) each operate with a corresponding first probability P1i are electrically coupled to the battery pack ( 111 ) and are each electrically decoupled from the battery pack ( 111 ) with a corresponding second probability P2i. Here, the battery cells ( 21 ) can be connected in series. In the method, for each battery cell ( 21 ), a first figure of merit G1i is calculated from the state of charge LZi and the state of aging AZi of the respective battery cell ( 21 ). An averaged first figure of merit G1 is also determined, which corresponds to the average value of the first figures of merit G1i of the battery cells ( 21 ). Furthermore, for each battery cell ( 21 ), a linear, in particular monotonically rising, function is calculated as the difference between the first figure of merit (G1i) of the respective battery cell (21) and the averaged first figure of merit G1 The second figure of merit G2i. In this case, for each battery cell ( 21 ), a respective first probability P1i and a respective second probability P2i are determined from the calculated second figure of merit G2i of the respective 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] exist figure 1 A battery system 10 known from the prior art is shown in , comprising a battery 11 with a plurality of battery cells (smart battery units, SCU) each having a battery cell 21 and an assigned A battery cell monitoring module (battery cell electronics module or battery cell electronics) 22 for the battery cell 21 . To simplify figure 1 In the illustration in , only two battery cells are shown and each assigned the reference numeral 20 . The battery cell monitoring module 22 enables individual c...

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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