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  #61  
Old 06-15-2012, 08:59 PM
GerhardRP GerhardRP is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Quote:
Originally Posted by kerrymann View Post
The procedure is attached.

Sorry for the long delay. I finished this over a month ago. I wanted to put a lot more information and lessons learned from testing into this but am too busy with the build. That and I had to strip some stuff out to make the .pdf small enough to attach it here. Anyway I hope people find it useful. And it would be great to start seeing other people's data.

Enjoy,
Are you keeping the cells under a standard compression to keep them from swelling under abuse during testing and proposed use?
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  #62  
Old 06-16-2012, 03:13 AM
marc02228 marc02228 is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

I don't know, how kerrymann does it.
I put a book under the cell, another book over the cell and some heavy thing, e.g. a toolbox (4kg) onto this book-cell-sandwich.

My cells don't get weak during the 2C charge, so I just do it when the cell is discharging. It definitely isn't as weak as it is without pressure on it during the discharge.
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  #63  
Old 06-16-2012, 08:30 AM
kerrymann kerrymann is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Quote:
Originally Posted by GerhardRP View Post
Are you keeping the cells under a standard compression to keep them from swelling under abuse during testing and proposed use?
Good question. Originally I was using a book with a 30lb SLA battery on top for the tests but I about half way to I tried it without the weight with no issues. For in my car I have made end plates that will be clamped together with long band clamps to provide compression. Similar to the original A123 packs.
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  #64  
Old 08-17-2012, 11:06 PM
ellweber ellweber is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Quote:
Originally Posted by kerrymann View Post
And it would be great to start seeing other people's data.
kerrymann,

I have the first 12 of a 300 cell planned pack and I am trying to follow your procedure and use rwaudios preset with my PL6. When trying to add data to the 5-23 version of your spreadsheet I cannot find the Analysis Tab's pull down. I am using Excel 2008 on a Mac.

Can you provide some more clues on the use of this please.

Best regards,

ellweber
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  #65  
Old 08-18-2012, 12:53 AM
marc02228 marc02228 is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

How can I add data without erasing the gray line?
Here are all tested cells:
1 1 0,9
2 1 0,8
3 1 0,8
4 1 0,8
5 1 0,8
6 1 0,8
7 1 0,8
8 1 0,7
9 18200 0,8
10 18095 0,9
11 18593 0,8
12 18739 0,8
13 17666 0,8
14 17823 0,8
15 18317 0,8
16 18347 0,8
17 17781 0,8
18 17848 0,8
19 18020 0,8
20 18214 0,8
21 17754 0,7
22 17982 0,7
23 17919 0,8
24 18600 0,7
25 18807 0,8
26 18754 0,8
27 18621 0,6
28 18608 0,7
29 18290 0,7
30 18601 0,7
31 18512 0,6
32 17811 0,8
33 18849
34 18709 0,7
35 18653 0,7
36 18637 0,6
37 17740 0,7
38 17701 0,8
39 18260 0,7
40 18206 0,7
41 17802 0,7
42 18267 0,7
43 17943 0,7
44 18791 0,7
45 18437 0,7
46 18585 0,8
47 18378 0,8
48 18425 0,8
49 18486 0,8
50 17967 1,3
51 18391 0,7
52 18524 0,6
53 18324
54 17678 1,1
55 18119
56 18838 0,9
57 18003 0,8
58 18022 0,7
59 17999 0,8
60 17430 0,8
61 17870 0,7
62 17865 0,7
63 17647 0,7
64 17874 0,7
65 18511 0,7
66 18373 0,7
67 18533 0,6
68 18926 0,7
69 18893 0,6
70 18969 0,7
71 18827 0,7
72 18655 0,7
73 18532
74 18751
75 18723 0,7
76 18651 0,8
77 18656 0,8
78 18824
79 18439
80 18332 0,7
81 18332 0,7
82 18133
83 18136 0,7
84 18438 0,7
85 18683
86 18574
87 18472 0,7
88 18385 0,9
89 18159 0,8
90 18234 0,8
91 18006 0,8
92 18423 0,8
93 17913 0,8
94 18401 0,8
95 18021 0,8
96 17845 0,8
97 18421 0,8
98 18390 0,8
99 18202 0,8
100 18238 0,8
101 18450 0,8
102 18184 0,8
103 18428 0,8
104 18550 0,8
105 18603 0,8
106 18710 0,8
107 17963 0,8
108 18291 0,7
109 18347 0,9
110 18260 0,8
111 18417 0,8
112 18377 0,8
113 18431 0,7
114 18917 0,6
115 18652 0,7
116 18787 0,7
117 18472 0,8
118 18525 0,8
119 18634 0,9
120 18787 0,8
121 18594 0,7
122 18872 0,7
123 18244 0,8
124 18641 0,7
125 18648 0,7
126 18606 0,8
127 18226 0,8
128 18130 0,7
129 18530 1,1
130 18232 0,9
131 18450 0,9
132 18947 0,8
133 18730 0,8
134 18859 0,8
135 18296 0,8
136 18323 0,8
137 18600 0,7
138 18266 0,7
139 18447 0,8
140 18561 0,8
141 18309 0,8
142 18184 0,8
143 18606 0,8
144 18242 0,7
145 18500 0,8
146 18732 0,8
147 18616 0,8
148 18599 0,7
149 18517 0,8
150 18461 0,8
151 18262 0,9
152 18252 0,9
153 17636 0,8
154 18032 0,7
155 17799 0,8
156 17788 0,8
157 18603 0,8
158 18314 0,8
159 18210 0,8
160 18660 0,7
161 18433 0,8
162 18410 0,8
163 18322 1
164 18398 0,7
165 18577 0,9
166 18449 0,9
167 18409 0,8
168 18199 0,7
169 18396 0,8
170 18283 0,8
171 18058 0,8
172 17931 0,8
173 17970 0,8
174 18046 0,8
175 18353 0,8
176 17623 0,8
177 18097 0,7
178 18024 0,8
179 17997 0,7
180 18227 0,7
181 18022 0,8
182 18035 0,8
183 18350 0,8
184 18006 0,8
185 18313 0,8
186 18254 0,8
187 18016 0,8
188 18112 0,7
189 18395 0,8
190 17953 0,7
191 18349 0,8
192 18534 0,8
193 18103 0,8
194 18160 0,8
195 18492 0,8
196 18140 0,7
197 18528 0,7
198 18329 0,9
199 18535 0,8
200 18402 0,8
201 18636 0,7
202 18501 0,8
203 18153 0,8
204 17754 0,8
205 18387 0,9
206 18022 1,2
207 18659 0,8
208 18498 0,8
209 18443 0,8
210 18594 0,8
211 18826 0,7
212 18804 0,8
213 18630 0,8
214 18559 0,8
215 18247 0,8
216 18203 0,7
217 18078 0,8
218 18210
219 18311 0,7
220 18329 0,8
221 18180 0,8
222 18139
223 18081
224 18480 0,8
225 18129 0,8
226 18698 0,8
227 18433 0,9
228 18513 0,9
229 18652 0,8
230 18544 0,7
231 18446
232 18427 0,7
233 18161 0,8
234 18239 0,8
235 18190 0,8
236 18339 0,8
237 18553 0,8
238 18373 0,8
239 18055 0,8
240 18475 0,8
241 18403 0,8
242 18891 0,8
243 18386 0,8
244 18084 0,8
245 18172 0,8
246 17907 0,9
247 18339 1
248 17828 1
249 18819 0,7
250 18737 0,7
251 18510 0,8
252 18739 0,7
253 18145 0,9
254 17899 0,8
255 18039 0,9
256 18011 0,9
257 17953 0,8
258 18299 0,8
259 17989 0,7
260 18185 0,8
261 18225 0,8
262 18144 0,8
263 18402 0,7
264 18320 0,7
265 18320 0,7
266 18671 0,6
267 18532 0,7
268 18893 0,7
269 18923 0,7
270 18953 0,7
271 18762 0,7
272 18770 0,7
273 18666 0,7
274 18757 0,7
275 18575 0,7
276 18681 0,7
277 18804 0,7
278 18776 0,8
279 17976 0,8
280 17927 0,7
281 18565 0,7
282 18686 0,7
283 18813 0,6
284 18725 0,6
285 18774 0,6
286 18893
287 18732
288 18647 0,7
289 18193 0,7
290 18330 0,7
291 18438 0,7
292 18167
293 18432
294 18334 0,7
295 1 4K
296 1 4K
297 18385 0,8
298 18001 0,8
299 17999 0,7
300 17696 0,7
301 18290 0,9
302 18789 1,2
303 18399 0,8
304 18183 0,8
305 18314 0,7
306 18065 0,7
307 18241 0,7
308 18277 0,7
309 18321 0,7
310 17883 0,8
311 18151 0,8
312 18196 0,8
313 18302 0,8
314 18425 0,8
315 18515 0,8
316 18698 0,7
317 18593 0,8
318 18829 0,7
319 18348 0,7
320 18428 0,8
321 18775 0,8
322 18902 0,8
323 18224 0,8
324 18544 0,7
325 18342 0,7
326 18308 0,8
327 18427 0,8
328 18420 0,8
329 18451
330 18724
331 18697
332 18471
333 18361
334 18406
335 18111
336 18108
337 18192
338 18113
339 18695
340 18064
341 18054
342 18595
343 18126
344 18003
345 1
346 18353 0,8
347 17770 0,7
348 18077 0,8
349 18047 0,7
350 17718 0,8
351 17831 0,8
352 17930 0,8
353 17746 0,8
354 18089 0,8
355 17975 0,8
356 18324 0,8
357 18130 0,8
358 1
359 18453 0,9
360 18521 0,9
361 18369
362 18811 0,6
363 18393 0,8
364 18480
365 18331 0,8
366 18499 0,8
367 18247 0,8
368 17914 0,8
369 18035 0,8
370 18227 0,8
371 18350 0,8
372 18320 0,7
373 18045 0,8
374 18275 0,8
375 17801 0,8
376 17806 0,8
377 17904 0,8
378 17900 0,8
379 18516 0,8
380 18482 0,8
381 18612 0,7
382 18848 0,7
383 18678 0,7
384 18665 0,7
385 18951 0,8
386 19055 0,8
387 18064 0,8
388 18014 0,8
389 18867 0,8
390 18774 0,8
391 18652 0,8
392 18528 0,7
393 18352 0,8
394 18347 0,8
395 17900 0,8
396 18182 0,8
397 17934 0,8
398 17803 0,8
399 18266 0,8
400 17865 0,8
401 18303 0,8
402 18234 0,8
403 17768 0,8
404 18278 0,7
405 18355 0,8
406 18514 0,8
407 17786 0,8
408 17638 0,7
409 17919 0,8
410 17940 0,8
I set he capacity of some cells to 1. These are test cells or cells in bad condition, I didn't want to have in my pack.

I matched the cells using a python script. Total 3P capacity varies from 55434 to 55429mAh.
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  #66  
Old 08-18-2012, 08:11 AM
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Ziggythewiz Ziggythewiz is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Cool, can you post the script? We were trying to figure that out a while ago and aside from brute forcing didn't get much better than reverse pairing.
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  #67  
Old 08-18-2012, 08:14 PM
kerrymann kerrymann is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Quote:
Originally Posted by ellweber View Post
kerrymann,

I have the first 12 of a 300 cell planned pack and I am trying to follow your procedure and use rwaudios preset with my PL6. When trying to add data to the 5-23 version of your spreadsheet I cannot find the Analysis Tab's pull down. I am using Excel 2008 on a Mac.

Can you provide some more clues on the use of this please.

Best regards,

ellweber
It's been at few months since I looked at the excel to remember off the top of my head I am but glad to hear people are interested in using it. I had pretty much given up on the idea. I am on the road this weekend but when I get back I'll take a look.
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1986 GL1200 Trike, 196V, 9"ADC, SLAs = RETIRED
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  #68  
Old 08-18-2012, 09:05 PM
ellweber ellweber is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Quote:
Originally Posted by kerrymann View Post
It's been at few months since I looked at the excel to remember off the top of my head I am but glad to hear people are interested in using it. I had pretty much given up on the idea. I am on the road this weekend but when I get back I'll take a look.
Thanks for looking at this. I don't want to cobble up the spreadsheet and upload it if I have something set up wrong! I can get it to show my own data and it is very helpful but we should try keep it more universal so the body of data is as big as possible.

I have already learned a bit about the 12 cells I received, they are surprisingly consistent in their performance (so far).
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  #69  
Old 08-19-2012, 03:34 AM
marc02228 marc02228 is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

Attached you see the Python script I used to match the cells.

Just put the capacity of your single cells starting with cell #1 into kapazitaet.txt.

Change the value of "dreierpack_n" to set your needed cells in series.

The script is written for 3 cells in parallel.

It looks for the best capacities and matches them to packs trying to get the same total capacity.

Run it a couple times and keep saving the last respectively best result. If it has a bad start, the capacities might vary more then if you start it some more times.

When it's done, it gives you the matched cell numbers in square brackets and below the total capacity of the paralleled cells.

Looks like this:

Quote:
#of cells in parallel: [[70, 399, 168], [27, 381, 9], [286, 189, 262], [283, 224, 222], [116, 94, 123], [317, 166, 98], [269, 185, 312], [318, 265, 170], [272, 380, 221], [271, 293, 100], [214, 324, 198], [322, 16, 304], [85, 101, 258], [302, 195, 311], [242, 247, 99], [274, 88, 29], [68, 109, 89], [360, 364, 113], [25, 359, 245], [120, 150, 142], [119, 147, 396], [213, 314, 112], [69, 303, 196], [210, 52, 158], [287, 346, 394], [133, 363, 141], [148, 45, 169], [114, 297, 357], [71, 87, 82], [77, 231, 290], [249, 205, 127], [132, 39, 261], [276, 232, 53], [281, 104, 15], [207, 328, 175], [28, 97, 241], [382, 136, 110], [143, 92, 200], [134, 319, 323], [288, 164, 243], [30, 202, 220], [124, 145, 301], [211, 401, 313], [212, 208, 225], [146, 51, 326], [72, 327, 191], [250, 393, 325], [137, 251, 309], [383, 11, 194], [33, 264, 151], [226, 263, 365], [24, 366, 81], [362, 66, 215], [122, 372, 234], [389, 163, 144], [390, 139, 218], [34, 105, 55], [56, 167, 102], [12, 48, 42], [74, 79, 307], [266, 67, 370], [26, 209, 90], [229, 73, 367], [78, 80, 374], [149, 49, 103], [115, 162, 361], [384, 240, 108], [106, 46, 83], [252, 291, 186], [270, 219, 292], [391, 121, 260], [278, 320, 180], [284, 237, 203], [385, 371, 128], [277, 315, 188], [44, 131, 235], [321, 47, 404], [76, 86, 40], [285, 31, 253], [125, 161, 183], [126, 392, 135], [35, 65, 138], [75, 406, 289], [157, 275, 152], [140, 129, 236], [230, 228, 238], [36, 379, 308], [386, 20, 233], [268, 294, 216], [282, 192, 159], [273, 267, 130], [118, 117, 227], [316, 111, 305], [160, 199, 402], [201, 84, 405], [165, 197, 356]]
Sum of cells in parallel: [55434, 55433, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55432, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55431, 55430, 55430, 55430, 55430, 55430, 55430, 55430, 55430, 55430, 55430, 55430, 55430, 55429, 55429, 55429, 55429]
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  #70  
Old 08-20-2012, 04:56 PM
ellweber ellweber is offline
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Default Re: Standardized PL6 testing for A123 cells and compiling data

I have completed preliminary testing of the first 12 cells I received and wanted to share the results. The attachments should be self-explanatory. Overall I have been pleased with the measured performance of these cells and am very appreciative of all the pioneering work that has been done here that allowed me to get some meaningful data quickly.

I think that the parasitic contributions of the test set-up may be contributing significantly to test data variability. In my test fixture there is more voltage drop (at 38 amps) across the two fuses than in the wires and cell tab pressure contacts combined! Also, there is clearly some temperature dependence of the cell's internal resistance and capacity and the PL6 does some unexplained things occasionally too.
Attached Images
File Type: jpg cellTests6.jpg (97.2 KB, 22 views)
File Type: jpg cellTester3.jpg (94.8 KB, 18 views)

Last edited by ellweber; 08-20-2012 at 05:16 PM.
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