Cell Integrated Temperature Sensors

Since the temperature of the cells will be different for the HP and HE cell during fast charge or discharge, the measurement of the temperature and the timely integration of the temperature in the SoC and charge equalization function are essential. In addition, due to this unique module design, a new temperature sensor must be developed. Basic requirements for the battery temperature sensors are:

  • excellent thermal integration, i.e. direct assembly onto the cells,
  • co-development of the sensor and its dimensioning with the read-out hardware and software,
  • electrically and mechanically stable assembly and connectors, and
  • low added cost.

For meeting these requirements, a temperature sensor based on printed electronics will be developed and integrated onto the cell housing. The sensor is assembled locally on the battery cells with a small thermal resistance. The proper choice of the sensor functionality as well as the development of the sensor characteristics and the interfacing materials tailored to the system needs enable a precise temperature measurement.

The temperature sensor will increase the accuracy of the SoC calculation performed by the algorithms in the BMS, thus in addition allowing the utilization of a wider range of the battery state-of-charge. Furthermore, the temperature field can be monitored and the peak temperatures, which are critical for safety and lifetime, can be monitored. The battery can therefore be dimensioned smaller and the overall battery weight and costs can be reduced and optimized.

Initial concept of integrated temperature sensor on pouch type cell

(Source: FhG)

General concept

The SuperLIB project focuses on smart control system solutions for traction batteries. The general concept consists of a combination of measures for

  • a dual-cell battery concept comprising high-power and high-energy cells,
  • including an electronic architecture for an efficient energy and current distribution,
  • managed by a smart control strategy, and
  • monitored by cell integrated temperature sensors