Technology for single charging device to charge multiple energy storage devices simultaneously

Abstract

Provided is a technology for a single charging device to charge multiple energy storage devices simultaneously. The technology is used for a single charging device to charge multiple energy storage devices simultaneously. Different energy storage devices differ in residual voltage. When the energy storage devices are connected in parallel by conductors, as the internal resistance is very small, there is charging and discharging current between the energy storage devices, and components and the conductors may easily be heated, fail or crack. In order to avoid the problem, each charging branch inside the charging device (or in the back of the load side) is connected in series with a controllable switch, and different energy storage devices are charged one by one in time order. Each charging branch inside the charging device (or in the back of the load side) is connected in series with a group of diodes. When there is a need to charge multiple energy storage devices simultaneously, the charging and discharging current between different energy storage devices is blocked based on the one-way current passing capacity of the diodes. Thus, a single charging device can charge multiple energy storage devices simultaneously, without the need to connect a controllable switch in series to each charging branch or charge different energy storage devices one by one in time order.

Description

(1) Technical field [0001] The technology is used in the field of DC energy storage and charging, and is used for charging electric vehicles (bicycles, cars, trams, subway trains, engineering vehicles, etc.), and can realize that a single (or) set of charging devices can charge multiple trains (or vehicles) at the same time. ) Charging the energy storage device of the energy storage electric vehicle. (2) Background technology [0002] The residual voltage of different energy storage devices is different. If conductors are used to connect them in parallel, since the internal resistance of the energy storage devices is very small, there will inevitably be a large value of charge and discharge current between energy storage devices with different voltages, and the current will easily cause connection. Line fusing and (or) heating, failure or bursting of the energy storage device. In order to avoid the above problems, when a single (or set) charging device is required to charge...

AI Technical Summary

Problems solved by technology

[0002] The residual voltage of different energy storage devices is different. If conductors are used to connect them in parallel, since the internal resistance of the energy storage devices is very small, there will inevitably b

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