Table 1 Test procedure 1 of charge and discharge profile measurement.
From: Charge and discharge profiles of repurposed LiFePO4 batteries based on the UL 1974 standard
Procedure and Step | Action | Key Parameters | Description | As per UL 1974 |
|---|---|---|---|---|
P1S1 | Rest | \({t}_{rest}=1\) minute | Rest for 1 minute, observing the stability of OCV, and obtaining \(OC{V}_{ini}\) | 19.2 |
P1S2 | Charge in CC-CV mode | CC: \({I}_{const}=0.05Ca{p}_{N}/{\rm{h}}\) CV: \({V}_{thres}=3.5\) V, \({I}_{cut}=0.045Ca{p}_{N}/{\rm{h}}\) | Safe charge at small \({C}_{R}=0.05{{\rm{h}}}^{-1}\) | N/A |
P1S3 | Charge in CC-CV mode | CC: \({I}_{const}=0.1Ca{p}_{N}/{\rm{h}}\) CV: \({V}_{thres}=3.5\) V, \({I}_{cut}=0.095Ca{p}_{N}/{\rm{h}}\) | Safe charge at small \({C}_{R}=0.1{{\rm{h}}}^{-1}\) | N/A |
P1S4 | Charge in CC-CV mode | CC: \({I}_{const}=0.2Ca{p}_{N}/{\rm{h}}\) CV: \({V}_{thres}=3.5\) V, \({I}_{cut}=0.195Ca{p}_{N}/{\rm{h}}\) | Safe charge at small \({C}_{R}=0.2{{\rm{h}}}^{-1}\) | N/A |
P1S5 | Charge in CC-CV mode | CC: \({I}_{const}=0.5Ca{p}_{N}/{\rm{h}}\) CV: \({V}_{thres}=3.5\) V, \({I}_{cut}=0.05Ca{p}_{N}/{\rm{h}}\) | Full charge at \({C}_{R}=0.5{{\rm{h}}}^{-1}\) | 19.4 |
P1S6 | Rest | \({t}_{rest}=1\) hour | Rest for 1 hour | 19.4 |
P1S7 | Discharge in CC mode | CC: \({I}_{const}=0.5Ca{p}_{N}/{\rm{h}}\), \({V}_{cut}=2.5\) V | Full discharge at \({C}_{R}=0.5{{\rm{h}}}^{-1}\) and obtaining \(Ca{p}_{D}\) | 19.4 |
P1S8 | Rest | \({t}_{rest}=1\) hour | Rest for 1 hour | 19.4 |
P1S9 | Charge in CC-CV mode | CC: \({I}_{const}=0.5Ca{p}_{N}/{\rm{h}}\) CV: \({V}_{thres}=3.5\) V, \({I}_{cut}=0.05Ca{p}_{N}/{\rm{h}}\) | Full charge at \({C}_{R}=0.5{{\rm{h}}}^{-1}\) and obtaining \(Ca{p}_{C}\) | 19.4 |
P1S10 | Rest | \({t}_{rest}=1\) hour | Rest for 1 hour | 19.4 |
