Technical Field  The present invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery pack
pack that is independently charged and discharged in series. BACKGROUND  Lithium batteries have a wide range of applications, and the use of silver battery packs in all walks of life in society is relatively large. At present, lithium battery pack packs are mainly charged in series when charging. There is a general problem of unbalanced charging during the charging process. Only some of the cells can be fully charged, while the remaining cells are in a state of dissatisfaction, which directly affects the actual capacity of the battery pack; , Due to the inconsistency of the battery cells, some of the battery cells will emit light first, while other batteries still have some power. However, when the battery management system detects a battery cell undervoltage, it will directly turn off the discharge switch and stop the external Discharge, the remaining power in the battery pack is not fully utilized: Moreover, it is difficult for a battery pack that is charged in series and discharged in series to realize the mixing of different types of batteries with different capacities, which affects the utilization rate of the batteries and causes unnecessary Waste of resources. Therefore, changing the charging and discharging mode of the lithium battery pack has a positive effect on improving the utilization rate of the cells and extending the service life of the battery pack. SUMMARY OF THE INVENTION  The technical problem to be solved by the present invention is to provide a lithium battery pack pack that is independently charged and discharged in series. The lithium battery pack can realize independent charging of cells, ensuring that each cell can be fully charged and is not easy to appear. For the problem of overcharging, the series discharge mode is adopted when discharging, and it can be determined whether the external output current is required according to the voltage of the cell itself, so as to ensure the full use of the power of each cell.  In order to solve the above technical problems, the technical solution adopted by the present invention is: an independent charging and discharging lithium battery pack in series, including a charging power module and at least one independent battery node; the charging power module and the independent battery node are electrically connected Are connected to provide a stable charging voltage; the charging positive terminal and the charging negative terminal of the independent battery node are connected in parallel, and the discharge positive terminal and the discharging negative terminal are connected in series;  the independent battery node includes a charging cell, an independent The charging module, the discharging control module, the charging protection circuit and the discharging bypass circuit; the independent charging module is electrically connected to the charging cell for charging the cell, and the independent charging module is provided with an isolation circuit for use In order to block the reverse charging between the independent battery nodes; the charging protection circuit is connected to the independent charging module to detect the working status of the independent charging module; the discharge control module is electrically connected to the charging protection circuit to control the discharge Current on and off: The discharge bypass circuit is electrically connected to the discharge control module for shunting the discharge current when the cell is under-voltage. u003c/pu003e
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