E-Mobility Engineering 017 l ECE Doosan electric excavators dossier l In Conversation: Matt Faulks l Battery testing focus l Battery Show North America 2022 report l Ariel Hipercar digest l Cathode materials insight l Thermal management focus

M elexis has launched two types of Hall effect current sensor for e-mobility power systems, along with an online simulation tool (writes Nick Flaherty). The MLX91230 is a conventional magnetic Hall effect sensor. It has a sensitivity drift of less than 1% and 100 mA offset over temperature, and operational lifespan for current monitoring in BMSs, battery disconnect units and power relay assemblies. The MLX91231 provides an alternative sensing approach through a shunt interface current sensor with a sub-0.5% sensitivity drift and a 50 mA offset. Having two different technologies with the same eight-pin SOIC package allows designers to switch from one configuration to the other if requirements change, and to integrate different combinations of sensing into their vehicles. Both are designed to the ISO 26262 functional safety standard with full support for ASIL integration. The MLX91230 is naturally isolated, while the MLX91231 needs external isolation. Each sensor has an integrated temperature sensor as well as a dedicated safety- rated overcurrent detection pin. To help design systems using the sensors, Melexis has also developed an online simulator tool. Its Current Sensor Simulator is tuned to the Melexis proprietary IMC-Hall technology to help engineers with limited experience with magnetic sensors. By filling in parameters on the web- based interface, engineers can describe the specific design requirements, and the tool then recommends the appropriate part number as well as the relevant ferromagnetic concentrator, also known as a shield. The tool also provides a total error budget across the full temperature and current sensing range. It also provides a visualisation of the non-linearities in the ferromagnetic shield to show the levels at which saturation will occur. That means users can see what impact the saturation will have and therefore choose the optimal shield. The sensors allow designers to switch from one sensing configuration to the other Hall e ect sensors include simulator SENSING D ow has launched a range of thermal elastic high-bonding adhesives to improve safety, sustainability and integrated assembly of EV battery packs (writes Nick Flaherty). The Voratron MA 8200S adhesives are aimed at bonding cells with insulating bottom shells, upper cover plates and side plate stiffeners, including bottom high-bonding adhesives, upper cover high-bonding adhesives, and side panel high-bonding adhesives. A low storage modulus in the adhesives provides long-term absorption of vibration energy, and makes batteries safer and more durable. The adhesives also support bonding between different substrates, such as all- aluminium alloy and composite battery pack casings. As the shell material cannot be welded or riveted, high-bonding adhesives reduce the number of auxiliary parts for reinforcing the ribs of the battery pack, reducing the weight of batteries and the full vehicle. The adhesives’ asymmetric interface bonding capabilities mean the battery pack lasts far longer, as the interface stress is reduced. The adhesives are made with a low- hardness filler compound. That helps reduce wear on the mixing equipment for the assembly process, and reduces the maintenance burden. They also Thermal elastics extend cell lifetimes ADHESIVES 10 January/February 2023 | E-Mobility Engineering