What is Electronic Battery Sensor ?

Electronic Battery Sensor

Electronic battery sensor

What is Electronic Battery Sensor ?

The electronic battery sensor (EBS) provides reliable and precise information on the status of 12V lead-acid batteries while taking battery aging effects into account. By providing this relevant information, the sensor allows for the implementation of an optimized electrical energy management (EEM) system in the vehicle and supports fuel- and CO2-saving technologies .

It is also a key component in electrified and automated vehicles as well as supporting other applications, such as firmware over-the-air, predictive diagnostics, and predictive maintenance.

Car battery with ebs

high measurement accuracy
for -voltage, current and temperature


flexible design- for integration into various installation spaces
integratedbattery state detection
The algorithm delivers precise, reliable information on the current and predicted battery state.
ASIL-B conformity
supports safety-relevant applications, such as highly automated driving.
How the battery sensor works: it measures the current to and from the battery. The sensor may also monitor the voltage, state of charge and state of health of the battery (aging).

The vehicle computer (BCM or PCM) uses these inputs to precisely adjust charging system voltage, idle speed and other parameters for better fuel efficiency and longer battery life. This system is called Power or Battery Management System or BMS. If the system detects that the battery is getting weak, it may turn off some electrical accessories (load shedding), such as the navigation, heated steering, heated seats, etc., to save the battery power. In this case, the computer will display a warning message on the instrument panel. The function of the battery sensor is particularly important in vehicles with Stop-Start feature, as the battery management system must verify that the battery has enough charge to re-start the vehicle. If the battery is low on charge, the Stop-Start feature is disabled.

The charging system current is also often higher in vehicles with Stop-Start feature. For this reason, in some vehicles, if the sensor has been disconnected or the battery has been replaced, the Stop-Start feature might not work for some time, until the computer (BCM or PCM) re-learns the parameters of the battery.
Function of the electronic battery sensor and areas of application.

The electronic battery sensor (EBS) measures the current, voltage and temperature of 12V lead-acid batteries with great precision. The battery state detection algorithm (BSD) integrated into the EBS calculates the current and predicted state of charge and function of the battery from these base parameters and indicates battery aging effects. This information is passed on to a higher-level control unit, e.g. the electrical energy management (EEM) system.

 If needed, that system implements suitable measures to ensure the power supply to ancillaries that are important or critical to safety.
Moreover, it serves other purposes like maximizing battery life by avoiding deep discharge or supporting fuel- and CO2-saving technologies such as smart generator control, start/stop or recuperation.
The sensor is also a key component in the design of safe and reliable vehicle electrical system topologies, thereby supporting the continuously increasing electrification and automation of vehicles as well as other applications, such as firmware over-the-air, predictive diagnostics, and predictive maintenance


Operating principle of the electronic battery sensor

Source : Bosch

The electronic battery sensor (EBS) is attached to the negative terminal of a 12V lead-acid battery with the terminal clamp and connected to the vehicle's body by a screw-on ground cable. The EBS measures the current using a shunt and determines the battery's voltage and temperature. 

These base parameters are required as input parameters for the integrated battery state detection (BSD) among other things. On that basis, the BZE algorithm predicts the battery's state of charge (SOC), the state of function (SOF) and the state of health (SOH).

The SOC indicates how much power is available. Using the SOC, the electrical energy management system (EEM) in the main control unit regulates ancillary load to optimize battery life and fuel consumption.
The SOF predicts the influence of the load profile on the voltage curve. Based on the SOH value, battery aging effects and their influence on the battery's capacity to store energy and its power output are calculated.




−40 °C to +115 °C


operating temperature


IP6K9K


Protection class


Power, LIN 2.2


2-pin connector

PRODUCT BENEFITS FOR MANUFACTURERS

Scalable and programmable data output based on customer needs
Cost-efficient design thanks to a platform concept
Advanced diagnostic functions during manufacture, transport and operation
Supports safety-relevant functions like automated driving (ASIL-B conformity)

PRODUCT BENEFITS FOR DRIVERS

Prevention of breakdowns resulting from a discharged batteryFuel savings thanks to the support of technologies such as smart generator control, start/stop und recuperation

Extended battery life Supports automated driving function.