Intelligent charging method with over charging protection function

Abstract

The invention discloses an intelligent charging method with an over charging protection function, which is characterized by utilizing rated voltage of a battery pack as a reference value, respectively setting a battery judgment voltage value, an initial voltage value and a limit voltage value, setting 3 to 8 detection values between the initial voltage value and the limit voltage value, charging the initial voltage value, the detection values and the limit voltage value from low to high in a sectional form, respectively setting charging time limit in each section, and charging a next section when voltage achieves upper limit of the section and does not achieve the limit voltage value within the charging time limits, or stopping charging. The intelligent charging method can be used for charging unused or used batteries with different properties appropriately, either charges over or charge insufficiently, can effectively identify damaged batteries and stop charging, thereby preventing other batteries in the battery pack from being damaged.

Description

technical field [0001] The invention relates to a charging method for a rechargeable battery pack, in particular to an intelligent charging method for overcharging protection of the battery pack according to the characteristics of the battery. Background technique [0002] Generally, when rechargeable batteries such as lead-acid batteries, nickel-chromium batteries, and nickel-metal hydride batteries are used, multiple batteries are connected in series to form a battery pack. There are generally the following methods for charging control: (1) Constant current charging or quasi-constant current charging is a method of charging the battery pack with a certain current, and the charging process is controlled by limiting the charging time. The efficiency is high, but the cost of DC constant current power supply is too high; (2) Constant voltage charging, in this charging mode, the current at the beginning of charging is high, and the current at the end of charging will become low...

AI Technical Summary

Problems solved by technology

The above methods all adopt a standard when setting the charging control parameters. However, in the actual use process, the voltage of the new and old batteries is different, and the charging current will also have an impact on the voltage of the battery, even the same batch. There are also differences among different batteries. For example, for a battery pack composed of multiple batteries, the voltage across the battery terminals after the new battery is fully charged is between 1.19 and 1.23 times the rated voltage of the battery, and after the battery is used for 300 cycles, After it is fully charged, the voltage at both ends of the battery will rise to 1.26 to 1.28 times the rated voltage. Therefore, if the same parameter is selected, under different battery conditions, serious undercharging or overcharging may occur.

And when a battery in the battery pack is damaged, the above charging method cannot be found in time, and continuing to charge may cause damage to other batteries.