Parallel Battery Resistance Matching for Balanced Power Sharing
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Solution Overview
Problem
Existing energy storage systems face challenges in efficiently managing the varying internal resistances of energy storage units due to aging and different usage profiles, leading to inefficient use and accelerated degradation of batteries when additional units are connected in parallel with existing units.
Innovation Solution
The introduction of a pseudo resistance in series with new energy storage units, matched to the internal resistance of older units, allows the controller to manage charging and discharging differently, ensuring balanced power distribution and controlled aging of both old and new units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additional new energy storage units are connected in parallel with existing older units, then the total energy storage capacity of the system is increased, but the internal resistance mismatch causes unbalanced power distribution and accelerated degradation of the older units
Solution Approach 1:
A pseudo-resistance element is introduced as an intermediary component connected in series with the new energy storage unit. This pseudo-resistance acts as a mediator that compensates for the internal resistance difference between new and old units, enabling balanced current distribution and preventing accelerated degradation of older units while maintaining increased total capacity
Solution Approach 2:
The internal resistance characteristic of the new energy storage unit is modified by adding the pseudo-resistance in series. This parameter change adjusts the total resistance of the new unit to match or approximate the resistance of older units, thereby achieving uniform power distribution across all parallel-connected units and extending system reliability
2Quantity of substance
If additional new energy storage units are connected in parallel with existing older units, then the energy storage capacity is increased, but the control complexity increases due to different internal resistance characteristics
Solution Approach 1:
The pseudo-resistance serves as a passive intermediary that automatically equalizes the electrical characteristics of new and old units. This eliminates the need for complex active control mechanisms, as the resistance matching occurs passively through the circuit design rather than requiring sophisticated control algorithms
Solution Approach 2:
By adding the pseudo-resistance, the total resistance of new units is made equivalent to that of older units. This creates equipotential conditions for current distribution across parallel branches, simplifying the control architecture as the system naturally balances power flow without requiring complex monitoring and adjustment mechanisms
3Power
If additional new energy storage units are connected in parallel with existing older units, then the system power output is increased, but the internal resistance differences cause inefficient power distribution
Solution Approach 1:
The total resistance parameter of new energy storage units is adjusted by adding pseudo-resistance in series, matching it to the resistance of older units. This parameter modification ensures that power is distributed efficiently across all parallel-connected units according to their actual resistance characteristics, maximizing overall power output while minimizing energy losses due to resistance mismatch
Data Source
AI summary
An electrical energy storage system has a plurality of primary energy storage units. Each primary energy storage unit has an inherent internal resistance. The system further includes one or more additional energy storage units. At least one additional energy storage unit further has a pseudo resistance. One or more controllers control the charging and discharging of each of the primary and additional energy storage units. Control of the charging and discharging of the, or each, additional energy storage units with the pseudo resistance is distinguished from the charging and discharging of each primary energy storage unit, and is distinguished from the charging and discharging of any additional energy storage unit that lacks a pseudo resistance.