A self-compensating single-bus and double-bus active balancing BSU module and control method

Abstract

The invention provides a self-compensating single busbar and double busbar active balancing BSU module and a control method, belonging to the technical field of storage batteries. The BSU module includes a single-female single-open balanced acquisition module, a single-female double-open balanced acquisition module, a double-female single-open balanced acquisition module, and a double-female double-open balanced acquisition module; wherein each circuit module includes two types of direct equalization and intermittent Control mode, that is, single-female single-open or single-female double-open balanced acquisition module direct equalization control mode, double-female single-open or double-female double-open equalized acquisition module direct average control mode, single-female single-open or single Intermittent control mode of double-open balanced acquisition module, double-female single-open or double-female double-open balanced acquisition module intermittent control mode. The invention adopts intelligent control and DC / DC isolation switching power supply technology, can balance a single battery string or a plurality of continuous battery strings in a module unit, and can also use the system working power supply to perform self-balancing among battery modules.

Description

technical field [0001] The invention belongs to the technical field of storage batteries, and in particular relates to a self-compensating single busbar and double busbar active balancing BSU module and a control method. Background technique [0002] The battery can be charged and discharged cyclically, and the device that converts chemical energy or electromagnetic energy to electrical energy, mainly including lead-acid batteries, nickel-based series batteries, lithium-ion batteries, sodium-ion batteries, supercapacitors, flow batteries, etc. However, due to differences in raw materials, production processes, and micro-environments of each battery cell, there are obvious differences in internal resistance, voltage, and capacity in actual use. At the same time, the voltage of the corresponding battery cells is relatively low. Generally, multiple battery cells need to be connected in series and parallel to form a single battery module (module), and then multiple battery modul...

AI Technical Summary

Problems solved by technology

However, there is a secondary transfer of energy during each equalization of this scheme, which leads to large efficiency loss, slow equalization speed (charge first, then discharge, and long consumption time), and has extremely high requirements on the cycle performance and life of the intermediate energy storage unit.

[0007] 4) The loop current is generally large when active equalization is adopted, and both ends of each battery string in the battery module are connected to the BSU through a certain length of insulated wire, so a certain voltage drop will be generated on the loop wire during equalization. And superimposed on the real terminal voltage of the corresponding battery string, and will lead to excessive or insufficient equalization

The conventional equalization scheme does not take effective measures to avoid the impact on the sampling voltage when the voltage drops or rises, so that the reference to the equalization judgment is the distorted voltage data, which ultimately reduces the accuracy of the equalization judgment and causes repeated equalization. under- or over-balanced condition

Images