Disclosed are a communication method between a master controller and slave controllers, a slave controller for the communication method, and a battery management system using the communication method and the slave controller, in which the master controller receives safety information about battery cells through a plurality of channels even when each of a plurality of slave controllers includes only one micro controller unit, thereby minimizing the increase in the cost and enhancing the safety of the battery management system. The communication method includes performing bidirectional communication between a master controller and first to N.sup.th (where N is an integer equal to or more than two) slave controllers through a first communication channel, and receiving, by the master controller, an indication signal through a second communication signal via the first to N.sup.th slave controllers.

Provided is a power distribution system for improving the reliability of power supply to the load in a case where a bidirectional DC/DC converter is connected to one power supply when redundantly configuring a power supply, including: a first terminal to be connected to a first battery; a second terminal to be connected to a second battery; a load terminal to be connected to a load; a bidirectional DC/DC converter connected between the first terminal and the second terminal; a first relay connected between the first terminal and the load terminal; a second relay connected between the second terminal and the load terminal; a control unit for performing controls of an operation direction of the bidirectional DC/DC converter, an opening and closing operation of the first relay, and an opening and closing operation of the second relay.

The present application discloses a method, apparatus, device and medium for equalization control of battery packs. The method may include: acquiring a voltage of each of a plurality of cells of the battery pack; on the condition that one or more voltages of the voltages of the plurality of cells are within a preset voltage interval, selecting a target State of Charge (SOC)-Open Circuit Voltage (OCV) curve from a charging SOC-OCV curve and a discharging SOC-OCV curve stored for the battery pack based on the voltages within the preset voltage interval; acquiring a target SOC of each cell based on the target SOC-OCV curve and the voltage of each cell; calculating, for each cell, a SOC difference between the target SOC of the cell and a reference SOC; calculating an equalizing time for each cell based on the SOC difference of each cell.

A resistor ladder comprising identical resistors is disposed electrically in parallel with a multicell battery to calibrate voltage-controlled oscillators or analog-to-digital converters for voltage balancing the battery cells in the multicell battery. Switches in a first state provide the voltage across each resistor as inputs to the VCOs or ADCs. The number of oscillations of the output signal of each VCO or ADC over a predetermined time period are compared to determine an offset error. Switches in a second state provide the voltage across each battery cell as inputs to the VCOs or ADCs. The battery cells with a higher relative voltage can be discharged until they are balanced. Some aspects describe temperature-adjusted and interpolated determinations of electrical quantities in the cells such as voltage and/or current.

According to one embodiment, a battery control device includes a charge and discharge circuit and a processor. The processor determines, based on an information regarding a secondary battery electrically connected to the charge and discharge circuit, whether or not a diagnosis implementation condition is satisfied; controls the charge and discharge circuit to charge the secondary battery only after discharging or charging up to a charging-start SOC if the diagnosis implementation condition is satisfied; acquires measurement data of a voltage and a current of the secondary battery while charging; estimates an internal state parameter of the secondary battery based on the measurement data; and diagnoses a deterioration state of the secondary battery based on the internal state parameter of the secondary battery.

An apparatus for balancing a battery according to the present disclosure includes: a voltage measuring unit configured to measure a voltage of each of a plurality of battery cells connected to each other; and a control unit configured to calculate a state of charge (SOC) of each of the battery cells from the voltage measured by the voltage measuring unit, select a standard cell and a target group on the basis of the calculated SOCs of the battery cells, choose one battery cell among battery cells belonging to the selected target group as a target cell, calculate a balancing time according to a difference between the SOC of the standard cell and the SOC of the target cell, and perform balancing to the battery cells belonging to the target group during the calculated balancing time.

Method for balancing states of charge of an electrical energy store with a plurality of battery cells.

A vehicle has a battery including a plurality of cells connected in series, and a battery management integrated circuit including a plurality of inputs each being directly electrically connected to a terminal of one of the cells via an electrical path that includes a thse and a resistor connected in series. The battery management integrated circuit farther includes a top input directly electrically connected to a positive output of the battery and configured to receive power from the battery that is defined by a current having a magnitude that is at least an order of magnitude greater than current received by the inputs and a voltage equal to a sum of voltages of all the cells. The battery management integrated circuit is configured to calculate a voltage difference between one of the inputs and an adjacent one of the inputs to determine a voltage of a top cell of the battery cells and to correct the voltage of the top cell to farm a corrected voltage as a sum of the voltage of the top cell and a calculated voltage drop across the fuse in the electrical path between the top cell and the one of the inputs. The vehicle further has a controller programmed to balance the cells according to the corrected voltage of the top cell.

A control device of a power supply system includes a stopping process unit. The stopping process unit is configured to operate a switching element when connection between a power system and a main line is cut off by a system breaker and to perform a stopping process of sequentially switching battery modules which are connected to the main line such that the number of battery modules which are connected to the main line decreases gradually.

A rechargeable battery system including at least one energy storage cell having a positive terminal and a negative terminal, a resistive element and a circuit configured to allow current to flow through the resistive element. A monitoring circuit measures the current flow through, and a voltage produced across, the resistive element and calculates the resistance of the resistive element. The current flow through the resistive element produces heat by raising the temperature of the resistive element. The current flow through the resistive element may be managed by a balancing circuit. A current sense resistor may be connected in series with a balancing resistor and a transistor turns on a balancing operation through balancing resistor. The monitoring circuit may determine the temperature of the resistive element based on the calculated resistance. The battery monitoring circuit may activate a battery cooling system based on the temperature of the resistive element.