SOW.pdf
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- Attached to
- Battery Cell Test Services Federal contract opportunity
- Solicitation number
- 80NSSC23841441Q
About this file
This statement of work outlines requirements for battery cell screening services. The contractor will screen up to 10,000 lithium-ion cells provided by NASA to identify outliers and discrepancies using an automated process. Tests will include cell identification, open circuit voltage measurement, visual inspection, mass and dimensional analysis, and capacity cycling with resistance testing. The contractor must submit a test plan and comply with NASA's screening specifications, with the exception of self-discharge and delta open circuit voltage testing. Capacity cycling will involve discharging cells to specified voltages and currents, pulsing for resistance calculations, and recording end of discharge voltages. The contractor will analyze test results, segregate passing and failing cells, and return all cells to NASA at 10% state of charge within five weeks of receipt. The contractor must report screening data and uniformity statistics electronically within the same five-week timeframe. This contract has a one-year period of performance to accommodate multiple cell deliveries and invoices.
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Text version
SOW for Automated Screening of 18650 Cells
14 Jun 2023
1.0 Objective – To perform the screening of 18650 cells to identify outlying or discrepant cells from passing cells in an automated process.
2.0 Scope – Contractor will be provided with up to 10,000 cells in their as-received state from the manufacturer. The contractor shall Identify cells, read their data matrix code, measure Open Circuit Voltage, Sleeve Removal, Visual Inspection, Mass, Dimensional, and Capacity Cycling with DC Resistance. Also in scope is a compilation of the uniformity statistics along with segregation of passing cells from rejected cells.
3.0 NASA Inputs – This shall be performed on INR18650-M36 Li-ion cells from LG Chem provided by NASA. NASA will provide cell manufacturer datasheet. NASA will also provide data from its initial lot assessment {ILA} with dimensional measurements for creating Go No-Go gauges, which can be used to set electronic dimensional inspection stations. NASA will be responsible for all cell shipments to and from the contractor.
4.0 Contractor Tasks
4.1 Plan - The contractor shall submit test plan outline with their proposal specifying the order of the tests and a compliance matrix against the precision & accuracy requirements (sec 4.0 of EP-WI-037B). Proposed deviations from this SOW and EP-WI-037B must be defended with rationale for why it will provide results as good or better than if fully compliant with the specifications herein.
4.2 Screening - The contractor shall perform the cell screening per EP-WI-037B with Section 3.4 Self-Discharge Rate and Section 3.3’s delta OCV both not performed. Furthermore, 3.5, Closed circuit voltage, CCV and 3.11 AC Impedance can be replaced with capacity cycling
3.12 done with DCR pulse and calculations. Only test equipment having current calibrations traceable to NIST shall be utilized for reported measurements. Tests 3.2-3.3 shall be performed at the “as-received” state of charge.
4.3 Capacity Cycling Profile – The contractor shall discharge the cells at 1.7A to 2.5V, rest, charge at 1.7A to 4.2V to a 50mA taper current cut-off, rest, discharge the cells at 1.7A to 50% SOC, pulse the cells for DCR calculations, discharge the cells to 10% SOC, measure the end of discharge (EOD) voltage, and rest.
5.0 Reporting – An electronic report of the initial data and with statistics per EP-WI-037B section 3.13 is required within 5 weeks after receipt of the 10,000 cells and contractual authorization to proceed.
The spreadsheet shall also include unique conditions used for each test and calculate the uniformity statistics for each parameter along with plots of the data with the ± 3 sigma thresholds. The End of Discharge (EOD) voltage (just prior to the end of discharge to 10% SoC) shall be recorded for each cell but not used to discriminate passing from failing cells. This parameter will be used as a sanity check against the charge capacity values.
6.0 Hardware Disposition – The contractor shall return all cells at 10% SOC and provide them to a hazardous materials shipper after NASA approval of the data provided in 5.0. Failing cells shall be individually marked and segregated from the passing cells in the return shipment. This shall be due within 5 weeks after receipt of the cells and receipt of contractual authorization to proceed.
Deliveries shall be FOB origin.
7.0 Period of Performance – The period of performance of this contract shall be 1 year to allow NASA flexibility for cell deliveries and invoices for completed milestones shall be allowed.
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