Abstract: A driver circuit is configured to control an ON/OFF state of a semiconductor power switch circuit, wherein the semiconductor power switch circuit is configured to connect a plurality of battery cells to a DC link capacitor associated with an electric motor. The driver circuit is configured to: control the semiconductor power switch circuit to cause the plurality of battery cells to charge the DC link capacitor; and control the semiconductor power switch circuit to generate and deliver an excitation current from the plurality of battery cells, wherein the excitation current is defined for a complex battery impedance measurement operation. The DC link capacitor is positioned in parallel with the electric motor. The excitation current comprises a periodic signal that passes from the semiconductor power switch circuit, through the DC link capacitor, and back to the plurality of battery cells.

Abstract: This disclosure describes a driver circuit configured to control an ON/OFF state of a semiconductor power switch circuit, wherein the semiconductor power switch circuit is configured to connect a plurality of battery cells to a DC link capacitor associated with an electric motor. According to this disclosure, the driver circuit is configured to: control the semiconductor power switch circuit to cause the plurality of battery cells to charge the DC link capacitor; and control the semiconductor power switch circuit to generate and deliver an excitation current from the plurality of battery cells, wherein the excitation current is defined for a complex battery impedance measurement operation.

Abstract: Monitoring devices for battery systems, battery systems and corresponding methods are provided. A monitoring device can communicate via a first interface with a control device. The monitoring device can communicate with a security device via a second interface in a first operating mode, and can communicate with a temperature sensor in a second operating mode of the second interface.

Abstract: A method, in particular for a battery management system, is described. According to one exemplary embodiment, the method comprises providing a digital message which comprises a multiplicity of frames, wherein the multiplicity of frames comprises an ID frame, at least one data frame and a checksum frame. The checksum frame includes a checksum value which has been calculated based on the data included in the other frames. The method further comprises generating a CAN message, wherein the data included in the data frame(s) and the checksum frame are inserted into a data field of the CAN message and wherein an identifier included in the ID frame is inserted into an ID field of the CAN message. The method further comprises transmitting the CAN message via a CAN bus line and receiving the CAN message and reconstructing the digital message.

Abstract: In accordance with an embodiment, a method includes receiving, by at least one of a plurality of battery monitoring circuits a frequency synchronization signal and measurement frequency information from a host controller, wherein the at least one of the plurality of battery monitoring circuits is connected to at least one of a plurality of battery blocks; generating, by the at least one of the plurality of battery monitoring circuits, a periodic signal based on a clock signal having a clock frequency, the measurement frequency information, and the frequency synchronization signal; obtaining, by the at least one of the plurality of battery monitoring circuits, at least one measurement value of the at least one of the plurality of battery blocks using the periodic signal; and transmitting, by the at least one of the plurality of battery monitoring circuits, the at least one measurement value to the host controller.

Abstract: A method for measuring a complex impedance of a plurality of battery cells in a battery pack comprises controlling an excitation current through the plurality of battery cells in the battery pack; receiving, in a single common measurement circuit, a plurality of voltage signals corresponding to the plurality of battery cells; measuring the excitation current; and calculating a complex impedance of each of the battery cells in the plurality of battery cells based on the plurality of voltage signals and the measured excitation current in a single measurement cycle using either one analog-to-digital converter (ADC) per battery cell or two matched ADCs per battery cell.

Abstract: Monitoring devices for battery systems, battery systems and corresponding methods are provided. A monitoring device can communicate via a first interface with a control device. The monitoring device can communicate with a security device via a second interface in a first operating mode, and can communicate with a temperature sensor in a second operating mode of the second interface.

Abstract: Various examples relate to techniques of monitoring a reliability of a cell-impedance measurement of a battery cell. In one example, a device includes a first interface configured to inject an AC excitation current into a battery cell and a shunt resistor coupled in parallel to the battery cell. The device also includes a second interface configured to inject an AC test current into the shunt resistor. The device also includes analog-to-digital converters configured to measure a cell voltage across the battery cell associated with the AC excitation current, a shunt voltage across the shunt resistor associated with the AC excitation current and the shunt voltage across the shunt resistor associated with the AC test current.

Abstract: A method, in particular for a battery management system, is described. According to one exemplary embodiment, the method comprises providing a digital message which comprises a multiplicity of frames, wherein the multiplicity of frames comprises an ID frame, at least one data frame and a checksum frame. The checksum frame includes a checksum value which has been calculated based on the data included in the other frames. The method further comprises generating a CAN message, wherein the data included in the data frame(s) and the checksum frame are inserted into a data field of the CAN message and wherein an identifier included in the ID frame is inserted into an ID field of the CAN message. The method further comprises transmitting the CAN message via a CAN bus line and receiving the CAN message and reconstructing the digital message.

Abstract: A battery management system is described that includes a controller configured to control electrical charging and discharging of a plurality of blocks of a battery. The battery management system also includes an inter-block communication network including a master node and a plurality of slave nodes arranged in a ring-type daisy-chain configuration with the master node. The master node is coupled to the controller and configured to initiate all command messages sent through the inter-block communication network and terminate all reply messages sent through the inter-block communication network. The plurality of slave nodes is bounded by an initial node coupled to the master node and a last node coupled to the master node.

Abstract: In accordance with an embodiment, a method of transferring data includes determining, by a first device, a data check field of a data frame based on a predetermined identification field and a plurality of data bits, wherein the predetermined identification field represents at least one of a content, source or target of the plurality of data bits; and transmitting, by the first device to a second device, the data frame comprising the plurality of data bits and the data check field without directly transmitting the predetermined identification field.

Abstract: A method for measuring a complex impedance of a plurality of battery cells in a battery pack comprises controlling an excitation current through the plurality of battery cells in the battery pack; receiving, in a single common measurement circuit, a plurality of voltage signals corresponding to the plurality of battery cells; measuring the excitation current; and calculating a complex impedance of each of the battery cells in the plurality of battery cells based on the plurality of voltage signals and the measured excitation current in a single measurement cycle using either one analog-to-digital converter (ADC) per battery cell or two matched ADCs per battery cell.

Abstract: In accordance with an embodiment, a method includes receiving, by at least one of a plurality of battery monitoring circuits a frequency synchronization signal and measurement frequency information from a host controller, wherein the at least one of the plurality of battery monitoring circuits is connected to at least one of a plurality of battery blocks; generating, by the at least one of the plurality of battery monitoring circuits, a periodic signal based on a clock signal having a clock frequency, the measurement frequency information, and the frequency synchronization signal; obtaining, by the at least one of the plurality of battery monitoring circuits, at least one measurement value of the at least one of the plurality of battery blocks using the periodic signal; and transmitting, by the at least one of the plurality of battery monitoring circuits, the at least one measurement value to the host controller.

Abstract: In accordance with an embodiment, a method includes receiving, by at least one of a plurality of battery monitoring circuits a frequency synchronization signal and measurement frequency information from a host controller, wherein the at least one of the plurality of battery monitoring circuits is connected to at least one of a plurality of battery blocks; generating, by the at least one of the plurality of battery monitoring circuits, a periodic signal based on a clock signal having a clock frequency, the measurement frequency information, and the frequency synchronization signal; obtaining, by the at least one of the plurality of battery monitoring circuits, at least one measurement value of the at least one of the plurality of battery blocks using the periodic signal; and transmitting, by the at least one of the plurality of battery monitoring circuits, the at least one measurement value to the host controller.

Abstract: In accordance with an embodiment, a method of transferring data includes determining, by a first device, a data check field of a data frame based on a predetermined identification field and a plurality of data bits, wherein the predetermined identification field represents at least one of a content, source or target of the plurality of data bits; and transmitting, by the first device to a second device, the data frame comprising the plurality of data bits and the data check field without directly transmitting the predetermined identification field.

Abstract: In accordance with an embodiment, a method of transferring data includes determining, by a first device, a data check field of a data frame based on a predetermined identification field and a plurality of data bits, wherein the predetermined identification field represents at least one of a content, source or target of the plurality of data bits; and transmitting, by the first device to a second device, the data frame comprising the plurality of data bits and the data check field without directly transmitting the predetermined identification field.

Abstract: Various examples relate to techniques of monitoring a reliability of a cell-impedance measurement of a battery cell. In one example, a device includes a first interface configured to inject an AC excitation current into a battery cell and a shunt resistor coupled in parallel to the battery cell. The device also includes a second interface configured to inject an AC test current into the shunt resistor. The device also includes analog-to-digital converters configured to measure a cell voltage across the battery cell associated with the AC excitation current, a shunt voltage across the shunt resistor associated with the AC excitation current and the shunt voltage across the shunt resistor associated with the AC test current.

Abstract: In accordance with an embodiment, a method of transferring data includes determining, by a first device, a data check field of a data frame based on a predetermined identification field and a plurality of data bits, wherein the predetermined identification field represents at least one of a content, source or target of the plurality of data bits; and transmitting, by the first device to a second device, the data frame comprising the plurality of data bits and the data check field without directly transmitting the predetermined identification field.

Abstract: A battery management system is described that includes a controller configured to control electrical charging and discharging of a plurality of blocks of a battery. The battery management system also includes an inter-block communication network including a master node and a plurality of slave nodes arranged in a ring-type daisy-chain configuration with the master node. The master node is coupled to the controller and configured to initiate all command messages sent through the inter-block communication network and terminate all reply messages sent through the inter-block communication network. The plurality of slave nodes is bounded by an initial node coupled to the master node and a last node coupled to the master node.

Abstract: A battery management system is described that includes a controller configured to control electrical charging and discharging of a plurality of blocks of a battery. The battery management system also includes an inter-block communication network including a master node and a plurality of slave nodes arranged in a ring-type daisy-chain configuration with the master node. The master node is coupled to the controller and configured to initiate all command messages sent through the inter-block communication network and terminate all reply messages sent through the inter-block communication network. The plurality of slave nodes is bounded by an initial node coupled to the master node and a last node coupled to the master node.