HV DTemp Measurement System

Precise knowledge of thermal behaviour and temperature curves is an essential prerequisite for the further development of high-performance high-voltage battery systems. For this purpose, temperatures must be measured with several hundred measurement points, even between the cells of the battery. With the HV DTemp measurement system, such measurements can be easily performed.

The HV DTemp measurement system consists of the three components: HV DTemp IC Sensors, HV DTemp-M Controller  and HV DTemp-P Central Unit.

With the IC (Integrated Circuit) temperature sensors of the IC-Sensors, the temperatures within the high-voltage battery are also acquired at cell level. Controller Modules transmit the digital signals to the Central Unit, which sends the measured values to the DAQ via a CAN bus. Only one high-voltage safe cable has to be led from the battery to the Central Unit, which creates only minor impact on the structure of the battery housing.

Highlights

• Use of IC temperature sensors on digital data bus
• Miniaturized, highly accurate, robust, very immune to interference
• Exact positioning and unique identification
• Sensor arrangement flexibly adaptable to the measurement object
• Very small space requirement for IC temperature sensors, controller and cables within the battery
• Temperature measurement in places where it was previously not possible due to lack of space
• Lowest possible influence on the measured object
• Scalable up to 512 IC temperature sensors per Central Unit
• HV-safety up to 1,000 V RMS

HV DTemp IC temperature sensors are soldered onto an ultra-thin flexible circuit and measure temperatures on their bottom surface. Due to their low height, installation is also possible between the battery cells.

• Dimensions (w×h×d): approx. 1,5 mm × 0,5 mm × 1 mm (single Sensor)
• Measurement range: -40 °C to ±125 °C
• Internal resolution: 16 Bit

The HV DTemp IC Sensors can be installed in different variants depending on the application:

Single Sensors

For direct connection to a HV DTemp-M Controller, single sensors are available with a connection cable.

Sensor Assemblies

Up to four single sensors can be combined to form a sensor assembly. For this purpose they are either daisy chained via connection cables or connected via a small distribution board. In this way, the arrangement can be designed in a very flexible way.

Ultra-thin Flexible Circuit

Many IC temperature sensors can also be installed as a group directly on a flexible circuit. The dimensions of the flexible circuit and the arrangement of the sensors can be precisely adapted to the measuring task. The position of the individual sensors can be transferred exactly from simulations and measurements can be repeated.

The HV DTemp-M Controller provides the addressing, the power supply of the sensors and the transmission of the temperature values to the HV DTemp-P Central Unit. For this purpose a Controller has 16 port inputs. The HV DTemp-M64 Controller allows the connection of up to four sensors per port. With the HV DTemp-M16 Controller one sensor per port can be connected. Up to eight HV DTemp-M Controller can be cascaded.

• Control and bundling of up to 64 temperature measurement points
• Cascading of up to eight Controller (for maximum 512 temperature measurement points)
• Dimensions (w×h×d): approx. 75 mm × 10 mm × 45 mm
• Measurement data rate / sending rate: 1, 2, 5, 10, 20 Hz

HV DTemp-P Central Unit

The HV DTemp-M Controller are connected to the Central Unit via a high-voltage safe cable. The Central Unit controls the entire system, forwards the data via CAN bus to the DAQ software and ensures high-voltage safety with two galvanically isolated inputs.

• Two digital inputs for a maximum of eight Controller
• Communication via CAN interface
• Reinforced insulation up to 1.000 V RMS