A power storage system includes: a battery; a voltmeter configured to measure voltage of the battery; an ammeter configured to measure current of the battery; and processing circuitry configured to control charge of the battery to prevent charging power exceeding charging power upper limit from being supplied to the battery. The processing circuitry is further configured to: calculate first charging power, at which the battery reaches voltage upper limit, based on estimated open-circuit voltage, which is an estimated value of open-circuit voltage of the battery, and first estimated internal resistance; calculate second charging power, at which the battery reaches the voltage upper limit, based on the voltage, the current, and second estimated internal resistance; and set the charging power upper limit, based on the first charging power and the second charging power.

Single, internally adjustable modular battery systems are provided, for handling power delivery from and to various power systems such as electric vehicles, photovoltaic systems, solar systems, grid-scale battery energy storage systems, home energy storage systems and power walls. Batteries comprise a main fast-charging lithium ion battery (FC), configured to deliver power to the electric vehicle, a supercapacitor-emulating fast-charging lithium ion battery (SCeFC), configured to receive power and deliver power to the FC and/or to the EV and to operate at high rates within a limited operation range of state of charge (SoC), respective module management systems, and a control unit. Both the FC and the SCeFC have anodes based on the same anode active material and the control unit is configured to manage the FC and the SCeFC and manage power delivery to and from the power system(s), to optimize the operation of the FC.

A charger circuit includes a power stage circuit operating at least one power switch according to an operating signal to convert an input power into an output power to charge a battery and/or to provide the output power to a load, wherein the output power includes a charging power and/or a load power; a control generating the operating signal according to a voltage amplifying signal; and a voltage error amplifier circuit comparing a voltage sensing signal relevant to a charging voltage of the charging power or a load voltage of the load power with a voltage reference level in a voltage hysteresis mode of a discontinuous conduction mode, so as to generate the voltage amplifying signal; wherein the control circuit adjusts the charging voltage or the load voltage according to the voltage amplifying signal, so as to maintain the charging voltage or the load voltage within a predetermined range.

A secondary battery system includes a secondary battery having an electrode body impregnated with an electrolytic solution containing metal ions. The secondary battery system measures an impedance of the secondary battery. The secondary battery system detects high-rate deterioration caused by uneven concentration of the metal ions in the electrolytic solution impregnated into the electrode body.

A system and method for variable power transfer in an inductive charging or power system. In accordance with an embodiment the system comprises a pad or similar base unit that contains a primary, which creates an alternating magnetic field. A receiver comprises a means for receiving the energy from the alternating magnetic field from the pad and transferring it to a mobile device, battery, or other device. In accordance with various embodiments, additional features can be incorporated into the system to provide greater power transfer efficiency, and to allow the system to be easily modified for applications that have different power requirements. These include variations in the material used to manufacture the primary and/or the receiver coils; modified circuit designs to be used on the primary and/or receiver side; and additional circuits and components that perform specialized tasks, such as mobile device or battery identification, and automatic voltage or power-setting for different devices or batteries.

System and method for charging or discharging one or more batteries. For example, a battery management system for charging or discharging one or more batteries includes: a first transistor including a first transistor terminal, a second transistor terminal, and a third transistor terminal, the second transistor terminal being configured to receive a first drive signal; a second transistor including a fourth transistor terminal, a fifth transistor terminal, and a sixth transistor terminal, the fifth transistor terminal being configured to receive a second drive signal; a burst mode detector configured to receive the first drive signal and generate a burst-mode detection signal based at least in part on the first drive signal; and a drive signal generator configured to receive the burst-mode detection signal and generate the first drive signal and the second drive signal based at least in part on the burst-mode detection signal.

Systems and techniques are provided for charging devices at a property using battery-charging drones. In some implementations, a monitoring system is configured to monitor a property and includes a battery-powered sensor configured to generate sensor data. The system includes a drone that is configured to navigate the property and charge the battery-powered sensor. A monitor control unit is configured to obtain a battery level from the battery-powered sensor and compare the battery level to a battery level threshold. Based on the comparison, the monitor control unit determines that the battery level does not satisfy the threshold. Based on the determination, the monitor control unit generates and transmits an instruction to a drone for the drone to navigate to the battery-powered sensor and charge a battery of the battery-powered sensor. The monitor control unit receives data from the drone that indicates whether the drone charged the battery of the sensor.

The present solution can execute a handshake process to establish a bidirectional session utilizing communications that can be implemented on EVs and chargers from various manufacturers. The present solution relates to a charger that can execute a handshake process communication between the charger and an electric vehicle to establish a session for bidirectional power delivery between the charger and the electric vehicle via a power cable. The charger can transmit, in the handshake process to the electric vehicle, a data structure comprising a field for a minimum current with a value for the field that is less than zero. The charger can configure, subsequent to transmission of the data structure comprising the value for the minimum current, the session for bidirectional power delivery between the charger and the electric vehicle via the power cable.

A method of developing a charging profile for charging a lithium-ion battery. A first phase of charging is at a constant current level, with the constant current level selected on the basis of battery resistance during charging and differential voltage (dV/dQ) analysis. A switch point is selected on the basis of a state of charge (SOC) of the battery when dV/DQ values increase. Next is an increasing voltage charging phase, with the voltage rate selected on the basis of charge acceptance and charge time.

System and method for charging or discharging one or more batteries. For example, a battery management system for charging or discharging one or more batteries includes: a first transistor including a first transistor terminal, a second transistor terminal, and a third transistor terminal, the second transistor terminal being configured to receive a first drive signal; a second transistor including a fourth transistor terminal, a fifth transistor terminal, and a sixth transistor terminal, the fifth transistor terminal being configured to receive a second drive signal; a burst mode detector configured to receive the first drive signal and generate a burst-mode detection signal based at least in part on the first drive signal; and a drive signal generator configured to receive the burst-mode detection signal and generate the first drive signal and the second drive signal based at least in part on the burst-mode detection signal.