Charge and discharge equalization equipment for battery pack

Abstract

The invention provides charge and discharge equalization equipment for a battery pack. The charge and discharge equalization equipment comprises a charge and discharge equalization control circuit and a serial battery pack, wherein the charge and discharge equalization control circuit comprises an MCU module, a constant current charge circuit, a relay set module and a constant voltage load circuit module; the constant voltage load circuit module comprises constant voltage loads which are connected in series with one another and correspond to the battery pack one by one; equalization voltage values are set in the constant voltage loads; when the voltage of a battery corresponding to a certain constant voltage load is less than or equal to the equalization voltage value, a corresponding relay is disconnected, and the constant voltage load does not work; when the voltage of the battery corresponding to the constant voltage load is greater than the equalization voltage value, the corresponding relay is connected, and current does not pass through the fully charged battery, but is directly discharged from the constant voltage load corresponding to the battery. According to the charge and discharge equalization equipment for the battery pack, the battery pack is connected in parallel with the constant voltage load module, so that each battery can be fully charged, but not overcharged, and each battery can exert the highest capacity; therefore, the battery pack can reach charge and discharge equalization and an optimal working state.

Description

technical field [0001] The invention relates to the technical field of battery charging management, in particular to a device for equalizing charging and discharging of a battery pack, which can be applied to iron-lithium battery packs used in electric vehicles and the like. Background technique [0002] Since the voltage of a single-cell iron-lithium battery is very low, the iron-lithium battery used in general equipment such as electric vehicles can only be used with multiple cells connected in series to obtain a higher voltage. When multiple batteries are connected in series, due to the difference between batteries, there will be differences in voltage capacity after long-term use, and this difference will become more and more serious as time accumulates. The performance of the entire battery pack depends on the weakest battery, which is similar to the barrel effect. When a conventional charger is charging a battery, it will stop charging when it detects that a battery i...

AI Technical Summary

Problems solved by technology

When some batteries in the battery pack are often not fully charged, it will affect the performance of the entire battery pack

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