Hyundai Mobis had 49 patents in batteries during Q3 2023. One patent describes a circuit for measuring battery cell voltage, which includes a protection circuit and an external power supply. Another patent is for an output control system that includes power controllers and a controller to determine the control mode based on the motor’s state. Additionally, there are patents for a battery module with a bus bar housing assembly that includes temperature and pressure sensors, and another battery module with a sensing assembly and multiple batteries stacked with electrode leads. GlobalData’s report on Hyundai Mobis gives a 360-degreee view of the company including its patenting strategy. Buy the report here.
Hyundai Mobis grant share with batteries as a theme is 31% in Q3 2023. Grant share is based on the ratio of number of grants to total number of patents.
Application: Circuit for measuring battery cell voltage and control method thereof (Patent ID: US20230268747A1)
The patent filed by Hyundai Mobis Co Ltd describes a circuit for measuring the voltage of battery cells in a battery stack. The circuit includes multiple battery cells, a device for measuring the battery cell voltage, a protection circuit connected in parallel to each terminal of the measuring device, and an external power supply that provides power to the protection circuit.
The protection circuit in claim 2 consists of a diode connected in series with a resistor. The anode of the diode is connected to the anode of the external power supply through a power terminal of the measuring device. The cathode of the diode is connected to one end of the resistor, and the other end of the resistor is connected to one of the terminals of the measuring device.
In the battery stack, the cathode of the lowest battery cell is commonly connected to the cathode of the external power supply and the ground terminal of the measuring device, as stated in claim 5. This connection is made through a bottom resistor and a bottom diode connected in parallel. One end of the bottom resistor is connected to the cathode of the bottom diode and the cathode of the lowest battery cell, while the other end is commonly connected to the anode of the bottom diode, the cathode of the external power supply, and the ground terminal of the measuring device.
The measuring device itself, as described in claim 8, has each terminal and the cathode of each battery cell connected in series through a resistor. Additionally, a capacitor is connected in parallel between each terminal and each resistor.
The patent also includes a control method for the circuit. The method involves a controller sensing the occurrence of a reverse voltage in a battery cell and outputting a reverse voltage-sensing signal to a hydrogen charging system. The hydrogen charging system charges hydrogen into the battery cell in response to the signal. The controller then checks whether the reverse voltage of the battery cell is resolved and stops the output of the reverse voltage-sensing signal when the reverse voltage is resolved.
Overall, the patent describes a circuit and control method for accurately measuring the voltage of battery cells in a battery stack, while also providing protection against reverse voltage and ensuring proper charging of the battery cells.