Power battery pack testing energy feedback device

Abstract

The invention provides a power battery pack testing energy feedback device, structurally comprising a plurality of power battery packs, a plurality of bidirectional DC / DC converter, a DC / AC inverter, a filter circuit, a signal sampling circuit, a control circuit, a drive circuit, a human-machine interface and corresponding auxiliary circuits; based on the electrical conversion principle, electricity of a power battery after charging testing is fed back to a power grid sequentially through the bidirectional DC / DC circuit and the DC / AC circuit, the power battery refers to chemical principle-based energy storage devices including various rechargeable batteries and supercapacitors; the device employs the multi-stage bidirectional DC / DC converter and can provide capacity feedback for different voltage levels of power battery units and packs; by using voltage and current double-closed-ring control, the voltage and power grid voltage are precisely controlled under same frequency, same phase and sample amplitude, grid-connected current is controlled to be reverse to the power grid voltage but under the same frequency, magnitude of feedback current is precisely controlled, discharge testing function for power battery testing is achieved for a power battery, and energy is saved.

Description

technical field [0001] The invention relates to the field of testing of a power battery pack, in particular to an energy feedback device for testing a power battery pack. Background technique [0002] With the rise of the electric vehicle industry, the quality and performance of power batteries have become a key link restricting the development of electric vehicles. How to test and evaluate the power battery is the main step that directly affects the quality of the power battery. [0003] In actual work, although the test work for the power battery pack may be based on different theories or experimental methods, it generally needs to be carried out with a test system, that is, to charge and discharge the power battery pack, so as to obtain the battery capacity, voltage, current, internal Based on parameters such as electrical resistance and temperature, the health status and cycle life of the battery pack are evaluated. [0004] At present, the charging test of the power b...

AI Technical Summary

Problems solved by technology

It is obvious that the second way of thinking can obtain a high-precision discharge test current, which is beneficial to the performance judgment of the power battery, but it has an important disadvantage, that is, the power consumption is large, the energy cannot be recycled, and the control of the discharge current is limited.

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