Abstract: In one embodiment, a system comprising a battery set comprising plural battery cells configured in a circuit; and a control system configured to switch current flow in the circuit from bi-directional flow to and from the battery set to mono-directional flow to or from the battery set based on an over-charging or over-discharging condition.

Abstract: a battery pack comprises a first battery, a second battery and a first current control unit. The first battery has a first anode and a first cathode, wherein a first potential difference is formed between the first anode and the first cathode. The second battery has a second anode electrically coupled with the first cathode, and a second cathode, wherein a second potential difference is formed between the second anode and the second cathode. The first current control unit has a first terminal electrically coupled with the first anode, a second terminal electrically coupled with the first cathode and the second anode, and a third terminal electrically coupled with the second cathode.

Abstract: A battery protection circuitry comprises a first control component, a first over-discharged protect switch and a second over-discharged protect switch. The first control component is configured to couple to a battery pack to read voltage values of each battery in the battery pack. The first over-discharged protect switch has a first end configured to couple to a negative pole of the battery pack, and a second end. The second over-discharged protect switch has a third end coupled to the second end. When a voltage value of any battery in the battery pack is less than an over-discharged default voltage, the first control component controls the second over-discharged protect switch to be disconnected prior to the first over-discharged protect switch. Wherein the voltage tolerance of the second over-discharged protect switch is higher than the voltage tolerance of the first over-discharged protect switch.

Abstract: In one embodiment, a system comprising a battery set comprising plural battery cells configured in a circuit; and a control system configured to switch current flow in the circuit from bi-directional flow to and from the battery set to mono-directional flow to or from the battery set based on an over-charging or over-discharging condition.

Abstract: In one embodiment, a system comprising a battery set comprising plural battery cells configured in a circuit; and a control system configured to switch current flow in the circuit from bi-directional flow to and from the battery set to mono-directional flow to or from the battery set based on an over-charging or over-discharging condition.

Abstract: In one embodiment, a system comprising a battery set comprising plural battery cells configured in a circuit; and a control system configured to switch current flow in the circuit from bi-directional flow to and from the battery set to mono-directional flow to or from the battery set based on an over-charging or over-discharging condition.

Abstract: A battery charge-discharge balancing circuit assembly used in a battery pack consisting of multiple secondary battery cells is disclosed to include a switch device installed in each of the positive and negative terminals of each secondary battery cell and a balancing resistor connected with all the secondary battery cells in a parallel manner and the balancing resistor device having two opposite ends thereof connected the switch devices in series. All the secondary battery cells or multiple secondary battery cells of the battery pack can share one balancing resistor. By means of discharging the secondary battery cells in rotation, every secondary battery cell gets balanced to achieve efficient charging, eliminating the problem of overheat of the prior art technique.