manufacturing cost model tool for flow battery stacks · reduce cost of grid- scale energy storage...
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Manufacturing Cost Model Tool for Flow Battery Stacks Scott Whalen, Alasdair Crawford, Mark Gross, Michael Loftus
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Motivations Reduce cost of grid-scale energy storage
1. Grid-scale electrical energy storage will only be adopted if they are cost effective
2. Materials and manufacturing costs individually exceed cost targets for the entirety of an installed system
3. Existing spreadsheet models contain limited manufacturing process flexibility, are typically point solutions with respect manufacturing, and are difficult to modify and easy to “break”
Objectives Develop a user-friendly manufacturing cost model tool
1. Create a tool for simulating manufacturing costs that is flexible for any domain (e.g. Flow battery, Li-ion, Fly wheel)
2. Identify processes where innovation would have greatest impact on cost reduction for large-scale production
3. Solve inverse problem to determine what the manufacturing costs would need to be to meet system level cost targets
Model Architecture
Manufacturing Cost Model
Cell Assembly
Membrane Sizing Global InputsHeat Treat
Felt
Building construction & maintenance
Consumables
Equipment
Labor
Utilities General economics
Production volume
Parts receiving
Robot places flow frames
Robot dispense solvent
Align bi-polar plate
Process n+1
Load membrane on
roller
Soak membrane in wet storage
Cut membrane to size
Robot places membrane on
conveyor
Process n+1
Robot places felt on furnace
conveyor
Robot places felt onto
furnace carosel
Heat treat felt
Robot places felt onto conveyor
Process n+1
Leak Testing
Conveyor delivers parts
Robot loads parts into leak
tester
Evacuate cells
Run automated
leak test schedule
Process n+1
Stack Assembly
Load girdle and end plate into
press
Robot places electrodes and carbon paper
Robot places cell assembly
Place o-rings and bolt stack
Process n+1
Module
Process
Part
This figure contains example processes and modules to illustrate the conceptual architecture of the model. It is not a comprehensive listing of all modules and processes required to manufacture a flow battery stack.
Step 1: Process Flows Step 2: Manufacturing Flows
Step 4: Run Model
Tool Developed in Visual C++
We thank OREGON STATE UNIVERSITY and JR AUTOMATION for their excellent contributions to this work
Cell Assembly
Leak Testing
Stack Assembly
Membrane Sizing
Cell Assembly Example
Step 3: Populate Cost Model
Modeling Steps
5% Stack Mfg Cost at 1000 MW
Knee in curve at 100-200 MW
Stack Manufacturing Components
- Floor/tooling area - Floor space cost - Operating capacity
- Water - Electricity - Natural gas
- Lifetimes - Taxes - Overhead
- Hourly rate - Training - Availability
- Production volume - Battery size - Cells per stack
- Installation - Maintenance - Shipping
- Raw material cost/qty - Consumable cost/qty
- Tool capital cost - Tool footprint - Tool capacity
- Water - Electricity - Natural gas
Scott A. Whalen Pacific Northwest National Laboratory P.O. Box 999, MS-IN: K1-85 Richland, WA 99352 (509) 372-6084 [email protected]
PNNL-SA-104951
Electricity Delivery & Energy Reliability
- Tool utilization - Labor required - Process yield