An energy storage stack power supply system for charging piles

Abstract

The invention provides an energy storage stack power supply system for charging piles, including charging equipment, energy storage stacks and busbars, several charging piles and several busbar access switches; the input of each charging pile passes through the busbar access switches and the busbars respectively. Correspondingly connected; the first energy storage module and the second energy storage module are respectively connected to the bus through the first electric control switch and the second electric control switch; the first voltage measurement unit and the output end of the first energy storage module connected in parallel; the second voltage measurement unit is connected in parallel with the output end of the second energy storage module; the outputs of the first voltage measurement unit and the second voltage measurement unit are connected with the input of the control unit; the output of the first energy storage module The output end is connected with the second energy storage module through the sampling switch and the sampling resistance module; the input of the linear amplifier circuit is connected with the sampling resistance module; the output of the linear amplifier circuit is connected with the input of the control unit through the analog-to-digital conversion unit; The prior art optimizes the usage management of the charging pile energy storage structure.

Description

technical field [0001] The invention relates to the technical field of charging piles, in particular to the application field of charging pile energy storage control. Background technique [0002] At present, the power supply terminals of each charging pile in the charging station are connected in parallel to the busbar terminal, and the busbar terminal is connected to the power input. In order to ensure the energy storage capacity, multiple batteries are connected in series and parallel to form an energy storage stack, and the whole is connected in parallel with the bus terminal. The monitoring of the capacity or remaining power of the energy storage stack or battery is very important for the service life of the charging pile. Although the battery manufacturer provides a reference relationship between the open circuit voltage of the battery and the battery capacity, due to the uncertainty of the use of the charging pile, Corresponding to the uncertainty of battery self-dis...

AI Technical Summary

Problems solved by technology

The monitoring of the capacity or remaining power of the energy storage stack or battery is very important for the service life of the charging pile. Although the battery manufacturer provides a reference relationship between the open circuit voltage of the battery and the battery capacity, due to the uncertainty of the use of the charging pile, Corresponding to the uncertainty of battery self-discharge, the internal resistance of the battery changes with aging, charge and discharge times, temperature, depth of discharge, etc., and informs the user that the remaining power of the energy storage structure can meet the maximum capacity of the charging pile under the premise of ensuring a safe discharge depth. There is a problem with the quantity used; the cost of battery management for each battery that makes up the energy storage stack is relatively high. Due to the topological connection structure and internal resistance changes of the batteries in the energy storage stack, the calculation model established is very complicated, and it is different from The overall battery management of the energy storage pile is the same, and there is also a problem of large deviations. Like mobile phone battery monitoring, although the mobile phone shows 20% of the remaining power, it may be perceived as 5% during actual use; In terms of user experience, it has a greater impact, and it may also be due to the impact of the excessive discharge of the energy storage stack on the structure of the energy storage stack; using the latest impedance tracking power calculation can obtain more accurate data such as battery internal resistance, due to the use of charging piles The required parameters are obtained during the charging process to calculate the remaining power of the energy storage structure. For users who have not used the charging pile, it is difficult to know the capacity of the charging pile corresponding to the energy storage structure in advance, and the simultaneous use of multiple charging piles will affect the unit. Power consumption, there is a waste of time waiting for the charging pile unit to be unable to meet the charging demand, which brings troubles to normal use

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