Charging device and method with adjustable output current in constant current charging stage

Abstract

The invention relates to the technical field of charging and in particular relates to a charging device and method with adjustable output current in a constant current charging stage. The device comprises a charging driving part which is used for charging a battery, a current sampling unit which is used for sampling a charging output current and converting the current into a feedback voltage signal and a control unit which is used for outputting a set voltage, wherein the set voltage and the voltage output by the current sampling unit are merged into a feedback voltage of current and the feedback voltage is fed back to the charging driving part. By adopting the embodiment of the invention, different quantities of batteries connected in series can be charged, the charging cost is reduced, and an appropriate constant current stage charging current is set according to batteries in different capacities, thus the charging device and method provided by the invention can meet requirements of multiple charging batteries; meanwhile, the current can be regulated in a constant current charging process, thus the charging process can adapt to battery states such as the state that temperature of the battery is changed.

Description

technical field [0001] The invention relates to the technical field of charging, in particular to a charging device and method with adjustable output current in a constant current charging stage. Background technique [0002] The maximum charging voltage that the integrated charging management chip of the existing rechargeable battery can achieve is limited. Taking the integrated charging chip of the lithium-ion battery as an example, the existing integrated lithium-ion charging chip can charge up to 6 series batteries, and the maximum output voltage of the battery is is 25.2V. However, in many industrial applications, the output voltage of the battery is required to reach 36V, so the integrated charging chip cannot meet this kind of demand. [0003] Taking a lithium-ion rechargeable battery as an example, the charging process in the constant current and constant voltage charging method is: first charge at a constant current, and then switch to constant voltage charging whe...

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention provides a charging device and method with adjustable output current in the constant current source charging stage, which is used to solve the problem that the current cannot be adjusted during the constant current charging process in the prior art, resulting in low charging efficiency, and for batteries with different currents For example, the problem of high charging costs

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