Balanced charger based on internal resistance of battery

Abstract

The invention relates to a balanced charger based on internal resistance of a battery. A power supply unit (2) provides working power supply for a controller (1), an internal resistance measurement module (3), and power supplies from 1(4-1) to N(4-n); the controller (1) is connected with the power supplies from 1(4-1) to N(4-n); voltage of single electric cores from 1(5-1) to N(5-n) is acquired; on or off of the power supplies from 1(4-1) to N(4-n) is controlled; the controller (1) acquires battery internal resistance of the single electric cores from 1(5-1) to N(5-n), and voltage values and internal resistance values of the single electric cores from 1(5-1) to N(5-n) are displayed via a connected liquid crystal display module (6).

Description

technical field [0001] The invention relates to an equalizing charger based on battery internal resistance, which belongs to the field of battery testing. Background technique [0002] At present, the conventional battery pack charger generally uses a charger to charge the battery pack in series. Since the battery pack is composed of multiple single cells in series, there are inevitably individual differences between the single cells, and the way of series charging Although it is simple and fast, as the charging proceeds, some single cells must reach the highest charging voltage, while other single cells have not reached this voltage. If you continue to charge the battery pack, it will inevitably cause some single cells to charge. If the battery cells are overcharged, if the total voltage reaches the rated charging voltage, and some of the single cells have not reached the maximum charging voltage, the charger will stop working, which will inevitably lead to undercharging o...

AI Technical Summary

Problems solved by technology

[0002] At present, the conventional battery pack charger generally uses a charger to charge the battery pack in series. Since the battery pack is composed of multiple single cells in series, there are inevitably individual differences between the single cells, and the way of series charging Although it is simple and fast, as the charging proceeds, some single cells must reach the highest charging voltage, while other single cells have not reached this voltage. If you continue to charge the battery pack, it will inevitably cause some single cells to charge. If the battery cells are overcharged, if the total voltage reaches the rated charging voltage, and some of the single cells have not reached the maximum charging voltage, the charger will stop working, which will inevitably lead to undercharging of individual single cells. Therefore, Individual cells in the battery pack are overcharged or undercharged for a long time, resulting in severe polarization of the individual cells, which affects the performance and service life of the battery pack

[0003] Recently, people have paid more and more attention to the research on the balanced charging of battery packs. However, the proposed balanced charging methods are all simple methods such as measuring the battery voltage. Parameters, the measurement and analysis of the internal resistance of the battery is beneficial to find out the backward battery, and carry out charging compensation on the backward battery in a targeted manner, so as to make the balanced charging effect better. The present invention is proposed based on this idea

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