Continental is launching two new sensors for electrified autos: the Present Sensor Module (CSM) and the Battery Affect Detection (BID) system. Each new options concentrate on defending the battery and/or on battery parameter retention.
The high-voltage Present Sensor Module (CSM), which can transfer into manufacturing this 12 months, measures the present and concurrently detects temperature. The Battery Affect Detection (BID) answer is a lightweight various to heavy underfloor “armoring” in opposition to injury.
The high-voltage Present Sensor Module (CSM) gives the present and temperature info to maintain the battery secure and guarantee long-term sturdiness.
Contemplating that the battery is the only most costly part in an electrical automobile, the CSM was not simply developed to guard the battery from overcurrents, however it should additionally assist to retain the battery parameters by limiting ageing results. Built-in both within the battery disconnect unit or within the battery itself, the CSM will present the 2 decisive bits of knowledge for battery safety in addition to dependable driving vary monitoring.
To help strict practical security necessities, the CSM is out there as a two-channel sensor, measuring present independently by integrating shunt know-how and corridor know-how in a compact, single unit.
The BID together with a light-weight construction detects underfloor impacts and alerts the motive force if a cease at a storage is critical in consequence. This relieves the motive force of the difficult determination whether or not an influence at excessive pace or a low-speed floor contact could have broken the battery. Compared to present steel underfloor safety the BID answer can save as much as 50% of weight.
The Present Sensor Module CSM absolutely helps ASIL D on system degree.
Lithium-Ion batteries retailer a large amount of power to offer a gorgeous driving vary. Significantly throughout charging, excessive present flows into the battery. Owed to inevitable bodily results, charging (and discharging) a battery will warmth it up—particularly high-power quick charging or sporty driving. To stop the automobile battery from overstress, the present needs to be managed to restrict the temperature gradient.
A lithium-ion battery has an optimum temperature span by which it is extremely secure and ages very slowly. Nevertheless, quick charging the battery is a tradeoff between retaining the battery secure and wholesome and limiting the length of charging. That is finest completed on an actual knowledge foundation.
—Horst Gering, Program Supervisor within the Passive Security and Sensorics Phase
The CSM additionally helps to calculate the exact remaining vary by monitoring present consumption.
The CSM measured present may be calibrated as much as 2,000 Amps with higher than ±1% accuracy on the shunt channel and ±3% accuracy on the corridor channel, plus temperature within the vary between -40 °C as much as 125 °C. Each present measurement applied sciences present full galvanic separation. This enter is then supplied through CAN interface to the battery administration system.
Along with optimizing the effectivity of charging whereas defending the battery, the CSM may even assist to detect mechanical malfunctions, which may result in a hearth if undetected. The CSM absolutely helps ASIL D on system degree.
The manufacturing of the CSM will begin inside 2022 for a worldwide automaker’s state-of-the-art electrical automobile. The primary product is a part of a modular sensing platform which is scalable for added options equivalent to voltage measurement and variety of measurement channels.
The Battery Affect Detection perform can sense potential battery injury and warn the motive force accordingly.
Battery Affect Detection. Sometimes, the lithium-ion battery of an electrical automobile is built-in in an underfloor place the place its weight contributes to a low middle of gravity and the place it’s effectively protected by the automobile construction—with two potential exceptions. At excessive speeds objects, equivalent to lashing straps, may be swirled up and injury the underfloor. At low speeds floor contact throughout a parking maneuver may also trigger injury.
Due to this fact, electrical autos are fitted with a big and sometimes heavy cowl to guard the battery compartment from the underside. Nevertheless, if an influence happens, it will likely be as much as the motive force to guage whether or not the automobile must be checked at a storage.
This isn’t a satisfying state of affairs as there’s poor visibility beneath a automobile, plus it takes a skilled eye to evaluate the true injury.
—Johannes Clemm, Managing Director Continental Security Engineering Worldwide
To assist the state of affairs and make a light-weight underfloor safety possible, Continental has developed the pressure-sensor primarily based Battery Affect Detection answer.
This technique detects and classifies underfloor influence occasions to alert the motive force if the battery integrity could have been breached. This manner the automobile proprietor can take precaution earlier than a punctured battery may ignite at a later level. As well as, the BID identifies the world of the injury, so the battery administration system can empty the cells in that space to forestall any danger of fireplace, Clemm provides.
The BID covers the 2 typical influence dangers: low-speed floor contact and high-speed intrusion.
Compared to present options the sensor-based underfloor safety can save as much as 50% of the burden of present battery shielding answer per automobile. The stress sensor satellites used within the BID derived from the confirmed Pedestrian Safety System (PPS pSAT) which has been in serial manufacturing and utilized in thousands and thousands of autos for greater than ten years. Any influence is detected through a ensuing stress sign in an air-filled silicone tube that’s built-in in serpentines on the backside of the battery compartment. The time distinction between the sign’s arrival on the two stress satellites at each ends of the tube makes it potential to calculate the world of the influence. The severity of the influence may be categorised through sign thresholds that serve to set off cascaded alarms to the motive force.
