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Added contact resistance - #2598
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The BPX test is failing because contact resistance is not included in the BPX schema. If everything else about this PR is fine, I can raise an issue on the BPX Github. But I can see why you might be concerned about my having created separate variables for voltage with/without contact resistance. |
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IMO the contact resistance parameter should be optional (i.e. add an option where it's not used and hence not needed). |
| if "Current [A]" in variables: | ||
| I = variables["Current [A]"] | ||
| V_contact_dim = V_dim - I * param.R_contact | ||
| elif self.options["operating mode"] == "explicit power": |
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In this case, wouldn't P=I*V_contact? And similar for explicit resistance? As in, the measured power would include the contact resistance? Or am I wrong?
It seems to me the cleanest way to do this would be to have a "contact resistance" option (so that the parameter is optional as @tinosulzer suggests) and then not allow "contact resistance" and "explicit power/resistance"?
| "in parallel to make a cell": 34, | ||
| "External surface area [m2]": 3.79e-2, | ||
| "Volume [m3]": 1.28e-4, | ||
| "Contact resistance [Ohm]": 0, |
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Remove this from here and the test will pass. BPX doesn't let you add extra fields that aren't in the schema, so it throws an error. You already hard-code zero contact resistance in bpx.py. If users want to read in BPX and add the contact parameter resistance after, they can do that in the usual way.
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All of the above issues have now been resolved but it's now failing to build scikits-odes... |
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Yes, @martinjrobins is working on fixing the scikits issue (not related to your changes) |
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If you merge the latest version of develop it should work now |
Codecov ReportBase: 99.69% // Head: 99.69% // Increases project coverage by
Additional details and impacted files@@ Coverage Diff @@
## develop #2598 +/- ##
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Coverage 99.69% 99.69%
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Files 271 271
Lines 19560 19573 +13
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+ Hits 19500 19513 +13
Misses 60 60
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| "Local voltage [V]": self.param.ocv_ref + V_cc * pot_scale, | ||
| "Terminal voltage": V, | ||
| "Terminal voltage [V]": V_dim, | ||
| "Terminal voltage": V - delta_phi_contact, |
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why is this minus and not plus?
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also would be good to add contact resistance as its own variable
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"Contact resistance [Ohm]" is a parameter. Did you mean make "Contact overpotential [V]" a variable? I can do that if you think it's appropriate.
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Yes I meant contact overpotential as a variable. Also smart to ignore my dumb minus vs plus comment, brain fart on my part
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Description
A new parameter "Contact resistance [Ohm]" has been added. This allows for the creation of a new variable "Contact voltage [V]", which is the same as "Terminal voltage [V]" but corrects for said contact resistance.
Type of change
Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.
Key checklist:
$ flake8$ python run-tests.py --unit$ cd docsand then$ make clean; make htmlYou can run all three at once, using
$ python run-tests.py --quick.Further checks: