Lithium-ion accumulators are the standard for electrochemical energy storage these days. In the mobility sector, in mobile devices and in stationary products they comprise a wide range of usage. Electric vehicles as well as stationary storage units contain several lithium-ion cells. Depending on their usage, cells are connected parallel or in series. By connecting different cells , a high amount of energy can be stored or released. Apart from safety precautions against shortcircuit, reverse polarity, deep discharge and overheating, charging is to be supported by a balancing process In this thesis a balancing prototype is planned and implemented. This balancer should be capable of charging lithium-ion accumulators as well as other cell types (lead-acid accumulators, etc.). In case of stationary storage, like buffering storage in industry, you have to be capable of supplying a high amount of charging current to minimize charging time. This charge base prototype should make possible a charging current up to 100 ampere. The temperature of the individual cells must be constantly monitored in order to be able to detect malfunction of the cells. This is why every cellpack is fitted with a temperature sensor. Because of transparency, every data of the charging process is logged, which gives you the opportunity to detect defective cells later on. As malfunction of the system can never be precluded, a monitoring level is implemented as precautionary measure. It can intervene in any system process in case of emergency. This can eliminate false temperature measurement or overcharging technically. The global trend to connect system components forces manufacturers to design their products user-friendly and simple. Because of this necessity, all measurements will be easily displayed on a touchscreen in realtime. The measurement data are saved on a microSD card every second. As passive balancing emits heat, the system is actively cooled by fans. The result of this thesis should be a fully functional charging system, which records measuring data and is saved by a higher measuring level.
|Translated title of the contribution||Realisation of a software assisted balancing supported by microcontrollers|
|Award date||23 Oct 2020|
|Publication status||Published - 2020|
Bibliographical noteembargoed until 21-08-2023
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