Energy Storage Balancing Device for Parallel Cell Voltage Control
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Solution Overview
Problem
When batteries are connected in parallel, ensuring a uniform State Of Charge (SOC) is challenging, leading to uneven power distribution and differing lifetimes, as unbalanced batteries can result in accelerated aging and reduced lifespan.
Innovation Solution
An energy storage system balancing device that collects voltage information from each cell, determines a balancing status, and sets a target cell voltage to control equalization, ensuring all batteries are balanced and degrade simultaneously, even when disconnected from each other and external loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If batteries are connected in parallel to increase capacity, then the total energy storage increases, but the State Of Charge becomes unbalanced leading to uneven power distribution and differing lifetimes
Solution Approach 1:
The balancing device continuously monitors the voltage of cells in each battery system and uses this feedback information to determine balancing status and adjust equalization control accordingly, ensuring all batteries maintain the same State of Charge even when disconnected from each other
Solution Approach 2:
A central balancing device acts as an intermediary between multiple independent battery systems, collecting voltage information from each system's equalization device and coordinating the balancing process to achieve uniform power distribution across all connected batteries
2Productivity
If batteries have different State of Charge at connection, then immediate operation is possible, but they will not converge to the same SOC leading to accelerated aging and reduced lifespan
Solution Approach 1:
The balancing device performs preliminary balancing operations on each battery system before they are connected to the parallel configuration, ensuring all batteries reach the same State of Charge in advance, thereby preventing accelerated aging and extending overall system lifetime
Solution Approach 2:
The system preemptively counteracts the tendency toward SOC divergence by continuously monitoring and adjusting cell voltages through equalization devices, preventing the harmful effect of unbalanced charging/discharging that would lead to accelerated aging
3Manufacturing precision
If individual cell balancing is performed in each battery system, then cell-level uniformity is achieved, but inter-system SOC balance remains challenging
Solution Approach 1:
The balancing device performs multiple functions: it monitors voltage in each battery system, determines inter-system balancing status, calculates target voltages, and controls equalization devices across all systems, thereby coordinating cell-level and system-level balancing in a unified manner
Data Source
AI summary
An energy storage system balancing device arranged to perform balance processing of charge states of a plurality of energy storage systems being disconnected from each other and from external loads is provided. Each of the storage systems is divided into a plurality of cells and at least one equalization device is arranged in each storage system for balancing the cells within the system. The balancing device is arranged to at least collect information about voltage of at least one cell in each storage system from the equalization device/-s and determine a balancing status of the storage systems on the basis of the collected information. The balancing device is further arranged to determine a target cell voltage in dependency of the balancing status and provide the target voltage to each equalization device to control the balancing of the cells.