Zinc Bromide Flow Battery Baffle for Pump-Free Crossover Control
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Solution Overview
Problem
In electrochemical energy storage systems, crossover reactions occur due to the migration of active species between electrodes, necessitating expensive ion exchange membranes and active pumping, which are costly and inefficient.
Innovation Solution
A flow battery design with a horizontal cell format that utilizes natural flow driven by density gradients, incorporating a separator and baffle to prevent crossover reactions, eliminating the need for ion exchange membranes and active pumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion exchange membranes are used to prevent crossover, then crossover reactions are reduced, but system cost increases
Solution Approach 1:
The patent removes the ion exchange membrane component entirely from the flow battery system. Instead of using membranes to prevent crossover, the design relies on natural density-driven convection currents to maintain species separation, thereby eliminating the costly and complex membrane component while maintaining system reliability
Solution Approach 2:
The system uses natural density gradients created during electrochemical reactions to drive self-circulation of electrolytes. The density differences between reactants and products automatically generate convection currents that prevent crossover without requiring external membranes or pumping systems
2Productivity
If active pumping is used to circulate electrolyte, then reactant utilization is improved, but system cost and energy consumption increase
Solution Approach 1:
The flow battery system utilizes natural convection driven by density gradients to circulate electrolytes through the cells. As electrochemical reactions proceed, density differences between reactants and products automatically generate fluid motion, eliminating the need for external pumps and reducing both system cost and energy consumption while maintaining effective reactant utilization
Solution Approach 2:
The system exploits changes in density parameters that occur naturally during electrochemical reactions. By designing cells that harness these density variations, the system converts chemical parameter changes into useful fluid flow, replacing mechanical pumping with a passive, energy-free circulation mechanism
3Reliability
If ion exchange membranes are used, then crossover prevention is improved, but energy consumption increases
Solution Approach 1:
The system employs natural density-driven convection to prevent crossover and circulate electrolytes simultaneously. This self-service mechanism eliminates the need for energy-consuming pumps and expensive membranes, using only the inherent density differences from electrochemical reactions to maintain species separation and drive fluid circulation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves high performance and energy density while reducing costs by leveraging natural flow to manage reactants and products, minimizing crossover and extending battery life without the need for expensive components.
Implementation Method 1
This innovative design approach takes advantage of the natural flow that arises due to density gradients formed as reactions take place at the electrode surface(s)
Implementation Method 2
a separator and a baffle are included to shape this natural flow in order to prevent crossover reactions and to drive reactants towards the proper electrode for the reaction
Data Source
AI summary
An energy storage system comprises a plurality of electrochemical cells. The electrochemical cells include a pair of electrodes including an anode and a cathode. An electrolyte in communication with the pair of electrodes. A flow shaping baffle is situated between the pair of electrodes. The flow shaping baffle includes a plurality of channels extending from a first end proximate the cathode to a second end proximate the anode along an axis substantially perpendicular to the electrodes. The first end has a first diameter and the second end has a second diameter. The first diameter is greater than the second diameter. The disclosed energy storage system does not require expensive pumps or ion exchange membranes and can operate efficiently over a long service life.