Abstract: A battery testing system with energy circulation includes a battery module to be tested, an electric power storage module, a bi-directional conversion module and a control module, and the control module controls the bi-directional conversion module to discharge the electric power storage module and charge the battery module to be tested, or discharge the battery module to be tested and charge the electric power storage module, so that the electricity can be fully and repeatedly used, and the electric power storage module can use a second-used power battery to save the cost of the electric power storage module while the battery testing system can be isolated from the grid of utility power to avoid creating a burden to the grid of the utility power.

Abstract: Disclosed is an apparatus for measuring and classifying a cell pack based on statistical parameters of charge of and discharge from the cell pack. The apparatus includes a control unit, a register, a database, a display, a charger and a load. The register, the database, the display, the charger and the load are connected to the control unit.

Abstract: Disclosed is an Ping-Pong Type Battery Management system. The Ping-Pong Type Battery Management system includes first and second battery packs, first and second battery switches, a sensing and controlling module, a supply power regulation module and a load power regulation module. The first battery switch is formed on the first battery pack. The second battery switch is formed on the second battery pack. The sensing and controlling module is connected to the first and second battery packs and the first and second battery switches. The supply power regulation module is connected to the first and second battery switches. The load power regulation module is connected to the first and second battery switches.

Abstract: Disclosed is an extensive battery management system for a second-used application automobile use batteries. The extensive battery management system includes a process unit, a record unit, an input interface and an output interface. The record unit is connected to the process unit so that the former stores data from the latter. The input interface is connected to the process unit. The output interface is connected to the process unit.