Abstract: An SOC calculation method includes: obtaining a battery core voltage of a battery module in a discharging state; obtaining a discharge parameter of the battery module when the battery core voltage is less than or equal to a preset voltage, where the preset voltage is greater than an under-voltage protection voltage of the battery module; obtaining a first voltage difference between the preset voltage and the battery core voltage; calculating a correction coefficient of an SOC according to the first voltage difference and the discharge parameter, where the correction coefficient is positively correlated with the discharge parameter and inversely correlated with the battery core voltage; and calculating a value of the SOC according to a rated full-load capacity of the battery module, the discharge parameter, and the correction coefficient.

Abstract: A method of discharging a battery assembly includes detecting, with aid of a timer, when the battery assembly is not in use for a threshold length of time, where the battery assembly is configured to power at least a part of a movable object. The method further includes initiating a controlled self-discharge of the battery assembly when the battery assembly is not in use for the threshold length of time; and during the controlled self-discharge of the battery assembly, in response to detecting that the battery assembly is activated or detecting that the movable object is powered on or detecting that current is flowing from the battery assembly, terminating the controlled self-discharge of the battery assembly regardless whether the battery assembly voltage drops to a threshold voltage value.

Abstract: A method of discharging a battery assembly used to power at least part of an object includes detecting when power to the object is turned off, detecting, with aid of a timer, an amount of time elapsed since the power to the object is turned off, and initiating a controlled self-discharge of the battery assembly when the amount of time exceeds a threshold length of time. The controlled self-discharge of the battery assembly is performed by a self-discharging circuit electrically coupled to the battery assembly.

Abstract: A hybrid power system comprises a power controller adapted to be in communication with a first power source, a second power source, and a load. The power controller is configured to: control discharging of the first power source without permitting discharging of the second power source to power the load when a power drawn by the load is greater than a predetermined threshold power for a time period; and control discharging of the second power source to power the load when the power drawn by the load is greater than the predetermined threshold power starting from when the time period ends.

Abstract: A method for detecting an operational status of a battery including a plurality of cells includes obtaining static voltages and dynamic voltages of the cells and determining the operational status of the battery based on the static voltages and dynamic voltages.

Abstract: A control circuit for controlling a battery core includes a power input terminal electrically connected to the battery core, a ferromagnetic random access memory having a dynamic mode and a non-volatile mode, and a control unit electrically connected with the ferromagnetic random access memory and the power input terminal. The control unit is configured to acquire state information of the battery core and store the state information to the ferromagnetic random access memory, and switch on or off an electrical connection between the power input terminal and the battery core to switch the ferromagnetic random access memory to the dynamic mode or the non-volatile mode.

Abstract: A method of discharging a battery assembly used to power at least part of an object includes detecting when power to the object is turned off, detecting, with aid of a timer, an amount of time elapsed since the power to the object is turned off, and initiating a controlled self-discharge of the battery assembly when the amount of time exceeds a threshold length of time. The controlled self-discharge of the battery assembly is performed by a self-discharging circuit electrically coupled to the battery assembly.

Abstract: A method for balancing a battery assembly includes selecting, from a plurality of batteries of the battery assembly in a charging state, one or more batteries based on a status of the plurality of batteries; and controlling charging of the selected one or more batteries for balancing the plurality of batteries. Battery balancing can be energy-efficient and time-efficient. The lifetime of the battery assembly can be extended.

Abstract: A method for preheating a battery includes: detecting a trigger event of preheating the battery, the trigger event including a corresponding key being turned on; and in response to detecting the trigger event, controlling a heating member to heat an accommodating space housing the battery until an ambient temperature in the accommodating space satisfies a temperature condition, wherein the heating member is powered by the battery to be preheated.

Abstract: A method is provided for managing an unmanned aerial vehicle (UAV). The UAV includes a first cell unit and a second cell unit connected in parallel. The method includes: detecting, by a first control circuit, whether a failure occurs in the first cell unit; detecting, by a second control circuit, whether a failure occurs in the second cell unit; establishing a communication between the first control circuit and the second control circuit; and in response to detecting a signal indicating that a failure occurs in the first cell or the second cell from the first control circuit or the second control circuit, reducing an output power of a propulsion device of the UAV.

Abstract: An energy delivery system includes: a solar cell configured to receive solar energy and generate electrical energy; an electrolysis module configured to generate a first fuel from water; a fuel cell configured to generate electricity by reacting the first fuel with a second fuel through an electrochemical reaction, wherein the electricity is used to power a movable platform; and a controller configured to generate instructions for the solar cell to provide the electrical energy to one or more of: (1) the electrolysis module to effect operation of the electrolysis module, and (2) the movable platform.

Abstract: Systems, methods, and devices of managing a battery assembly used to power an object are provided to discharge a battery assembly for a safe and long-term storage. A controlled self-discharge of the battery assembly may be initiated when the power to the object is turned off for a certain length of time or the battery assembly is not in use for a threshold length of time. The controlled self-discharge may be terminated if the battery assembly reaches a threshold voltage value or the battery is in use again during the self-discharge.

Abstract: A system for balancing a battery assembly and related methods for making and using same are provided. The system can obtain a status of a battery assembly with a plurality of batteries. One or more of the batteries can be selected based on the obtained status, and the selected batteries can be balanced. The system, for example, can control active balancing of the selected batteries when the battery assembly is in a static state and control selective discharging of the selected batteries when the battery assembly is in a discharging state. When the battery assembly is in a charging state, selective charging of the selected batteries can be controlled. One or more cells that comprise the individual batteries alternatively can be selected for balancing. A protective circuit can help ensure safety of the balancing. Battery balancing can be energy-efficient and time-efficient. The lifetime of the battery assembly can be extended.

Abstract: Systems, methods, and devices are provided herein for removing a byproduct of a fuel cell from a vehicle. The vehicle comprises a fuel cell and a venting system. The fuel cell is in communication with a fuel storage container. The fuel is configured to generate electricity and a byproduct, by reacting a first fuel from the fuel storage container with a second fuel through an electrochemical reaction. The venting system is configured to expose the byproduct to forced convection.

Abstract: A battery, a thermal management device of the battery, and an unmanned aerial vehicle having the battery are provided. The thermal management device comprises a heat conducting housing having a receiving cavity and configured to divide the receiving cavity into a plurality of cell compartments for receiving cells, and a heat conducting shelf mounted within the receiving cavity and configured to be in contact with at least one of the cells to conduct heat generated by the at least one of the cells. The heat conducting shelf is thermally connected with an inner wall of the receiving cavity and configured to conduct heat in the heat conducting shelf to the heat conducting housing.

Abstract: A method for preheating a battery includes acquiring an ambient temperature of a preheating zone, determining if the ambient temperature of the preheating zone satisfies a preset temperature condition, and, if the ambient temperature does not satisfy the preset temperature condition, controlling heating of the preheating zone until the ambient temperature satisfies the temperature condition.

Abstract: A method is provided for managing an unmanned aerial vehicle (UAV). The UAV includes a first cell unit and a second cell unit connected in parallel. The method includes: detecting, by a first control circuit, whether a failure occurs in the first cell unit; detecting, by a second control circuit, whether a failure occurs in the second cell unit; establishing a communication between the first control circuit and the second control circuit; and in response to detecting a signal indicating that a failure occurs in the first cell or the second cell from the first control circuit or the second control circuit, reducing an output power of a propulsion device of the UAV.

Abstract: A hybrid power system comprises a power controller adapted to be in communication with a first power source, a second power source, and a load. The power controller is configured to: control discharging of the first power source without permitting discharging of the second power source to power the load when a power drawn by the load is greater than a predetermined threshold power for a time period; and control discharging of the second power source to power the load when the power drawn by the load is greater than the predetermined threshold power starting from when the time period ends.

Abstract: A charging control circuit includes a charging unit, a plurality of power output terminals configured to connect with a plurality of rechargeable batteries, respectively, a plurality of switch units each connected between the charging unit and one of the plurality of power output terminals, and a control unit electrically connected with the switch units. The control unit is configured to switch to a first charging mode or a second charging mode, and output, to the switch units, a switch signal corresponding to the first charging mode or the second charging mode. The switch signal causes the switch units to switch on or off electrical connections between the charging unit and the plurality of power output terminals.

Abstract: A battery includes a first cell unit, a first control circuit electrically connected with the first cell unit, a second cell unit connected with the first cell unit in parallel, and a second control circuit electrically connected with the second cell unit. The first control circuit is configured to disconnect an electrical connection between the first cell unit and a power output terminal of the first control circuit in response to a failure of the first cell unit. The second control circuit is configured to disconnect an electrical connection between the second cell unit and a power output terminal of the second control circuit in response to a failure of the second cell unit.