PRIMED Test Info

This page desicribes the making and format of past battery tests at PRIMED.

General Format

Major tests at primed all follow the same general naming convention. An example of a test name from a previous test is B6T10V0.

The test name starts with a B representing the batch of cells that is tested together. In this case, batch 6 is a batch of Mollicel P42A cells. This is followed by the test number T10. The test number represents the order of steps within the test. The final character V, indicates the version number of the test. The version number is changed if the same test is run with different parameters like C-rates or DOD’s. The provided data files will start with the test name followed by underscores and numbers representing the channel numbers in the test and a final _channel_# that indicates what channel the file refers to. An example file name is shown below.

text

B6T10V0_1_2_3_4_9_10_11_12_13_14_15_16_Channel_1

Test summaries will eventually be added to the documentation; unfortunately, they are currently only available upon request via contact through the PRIMED website.

Smaller, informal, experiments that last no longer than a week are givin miscellaneous names that indicate what the experiment was used for. An example would be leaf_characterization for an experiment that characterizes Nissan Leaf batteries.

B6: Mollicel P42A Test

The B6 dataset is the largest dataset currently at PRIMED. It consists of 16 Mollicel P42A cells that were cycled under varying conditions. The test consists of a characterization cycle and a degradation cycle. The degradation cycle runs continuously except for when it is interrupted by the characterization cycle every 14 days. There are 3 test versions that are run in batch 6, however, they all share the same characterization cycle.

Characterization Cycle

The characterization cycle for B6 tests has the following steps:

1. Set chamber temperature to \(T_a = 23^{\circ}\) C

2. 4 hour rest (temperature soak)

3. CC discharge at C-rate = -1/3 until minimum voltage

4. 1 hour rest

5. CC charge at C-rate = 1/3 until maximum voltage

6. CV charge at maximum voltage to cutoff current \(I = \frac{Nominal Capacity}{100}\)

7. 1 hour rest

8. CC discharge at C-rate = -1/3 until minimum voltage

9. 1 hour rest

10. CC charge at C-rate = 1/3 until \(\int_{t_0}^{t} i(t)\,dt\ = (Step \text{ } 8 \text{ } Discharge Capacity)/2\)

11. 1 hour rest

12. EIS test from 100kHz-1Hz

13. 10 min rest

14. Direct current internal resistance test

15. 10 minute rest

16. CC charge at C-rate = 1/3 until \(\int_{t_0}^{t} i(t)\,dt\ = (Step \text{ } 8 \text{ } Discharge Capacity)*DOD_i/2\)

Test 10 Degradation Cycle

The degradation cycle for T10 has the following steps:

1. Set chamber temperature to \(T_a = 35^{\circ}\) C

2. 4 hour rest (temperature soak)

3. CC charge at 1C to maximum voltage

4. CV charge at maximum voltage to cutoff current \(I = \frac{Nominal Capacity}{20}\)

5. 20 minute rest

6. CC discharge at \(C_i\) until \(\int_{t_0}^{t} i(t)\,dt\ = (Nominal Capacity)*DOD_i\)

7. 20 minute rest

8. Return to step 3

where \(C_i\) and \(DOD_i\) will be different C-rates and depths-of-discharge for different channels.

Test 11 Degradation Cycle

Coming Soon.

Test 12 Degradation Cycle

Coming Soon.

B6 Test Index

Step	Test 10	Test 11	Test 12
1	Start	Start	Start
2	C Reset	C Reset	C Reset
3	C CC Dis	C CC Dis	C CC Dis
4	C Rest	C Rest	C Rest
5	C Reset	C Reset	C Reset
6	C CC Cha	C CC Cha	C CC Cha
7	C CV Cha	C CV Cha	C CV Cha
8	C Rest	C Rest	C Rest
9	C Reset	C Reset	C Reset
10	C CC Dis	C CC Dis	C CC Dis
11	C Rest	C Rest	C Rest
12	C CC Cha	C CC Cha	C CC Cha
13	C Rest	C Rest	C Rest
14	ACIM	ACIM	ACIM
15	C Rest	C Rest	C Rest
16	IR	IR	IR
17	C Rest	C Rest	C Rest
18	C Reset	C Rest	C Rest
19	C CC Cha	D Reset	D Reset
20	C Rest	D CC Dis	D Rest
21	C Reset	D Rest
22	C Rest	D CC Cha
23	D CC Dis	D Rest
24	D Reset	D Reset
25	D Rest	Sim
26	D CC Cha
27	D CV Cha
28	D Rest
29	D CC Dis
30	D Reset
31	D Rest