Device with electric load

Abstract

The invention relates to a device (1) with an electric load (40) and a replaceable electric energy store (30). The energy store (30) has at least one first storage unit (31) with a first initial energy quantity E1 and at least one second storage unit (32) with a second initial energy quantity E2, wherein an electronic measuring / operating circuit (20) is designed to actuate the first storage unit (31) or the second storage unit (32) according to an algorithm. By actuating the first storage unit or the second source unit, the energy supply of the device is ensured by the respective storage unit,and by actuating the first storage unit or the second storage unit, it is ensured that when the remaining energy quantity or the applied energy quantity of one storage unit is low, the respective other storage unit has a remaining energy quantity of at least 10%, in particular at least 20%, preferably at least 30%, of the total energy quantity EG of the first initial energy quantity E1 of the first storage unit (31) and the second initial energy quantity E2 of the second storage unit (32).

Description

technical field [0001] The invention relates to a device with an electrical load and a replaceable electrical energy store. Background technique [0002] Devices according to the prior art that operate with an energy store and that are used in critical applications require a measure for the state of charge of the energy store so that the energy store can be replaced before it is completely empty so that the application is not compromised. [0003] Such a device can be, for example, a battery-operated flow meter, and in particular a battery-operated magnetic induction flow meter, see for example document DE 10 2015 103 580 A1. [0004] In this case, the measure for the state of charge is, for example, the charge voltage of the energy store. In energy stores in which the charging voltage is almost constant over a wide range of states of charge within the measurement accuracy range of the charge voltage, a coulomb counter is used to measure the consumed energy in order to achi...

AI Technical Summary

Problems solved by technology

[0005] However, measuring the charging voltage or measuring the consumed energy is itself associated with a certain energy consumption, which leads to a devastating reduction in the service life of the energy store in the case of devices with low energy consumption

[0006] Furthermore, the estimation of the remaining service life of the energy store due to measurement errors of the charging voltage or of the already consumed energy itself is subject to large uncertainties

Moreover, in the case of a coulomb counter for estimating the remaining service life, the initial energy quantity of the energy store must be known, which itself is only an imprecisely known value due to production-related uncertainties

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