Ec sei bug

[valentinsulzer]

Description

Fix some bugs in the non-dimensionalization of the EC SEI model.
Also capitalized SEI everywhere

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.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #1397 (93074ed) into develop (9a95deb) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1397      +/-   ##
===========================================
- Coverage    98.22%   98.22%   -0.01%     
===========================================
  Files          278      278              
  Lines        15806    15804       -2     
===========================================
- Hits         15526    15524       -2     
  Misses         280      280              

Impacted Files	Coverage Δ
...models/submodels/interface/kinetics/no_reaction.py	100.00% <ø> (ø)
...amm/models/submodels/interface/sei/constant_sei.py	100.00% <ø> (ø)
pybamm/models/submodels/interface/sei/no_sei.py	100.00% <ø> (ø)
...odels/porosity/leading_reaction_driven_porosity.py	100.00% <ø> (ø)
pybamm/parameters/parameter_sets.py	100.00% <ø> (ø)
pybamm/parameters/parameter_values.py	99.41% <ø> (ø)
...m/models/full_battery_models/base_battery_model.py	99.68% <100.00%> (ø)
...ttery_models/lithium_ion/base_lithium_ion_model.py	100.00% <100.00%> (ø)
...bamm/models/full_battery_models/lithium_ion/dfn.py	100.00% <100.00%> (ø)
...bamm/models/full_battery_models/lithium_ion/spm.py	100.00% <100.00%> (ø)
... and 13 more

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[brosaplanella]

Looks good Tino, thanks! We just need to update the CHANGELOG before merging