"Taycan lets you drive with shorted out battery modules"

[f1eng]

Pretty much, all you get from 1 module (12 cells) is the individual voltage from each cell and temperature measured at 2 different locations within the module. Any other data has to be inferred from these two variables alone.

Including identifying faulty modules.

Porsche HQ has a software that analyzes the VAL (Vehicle Analysis Log) created by technician with PIWIS 4 and pin points exactly the modules failed and those like to fail.

As I thought, not enough sensors for definitive continuous measurement.
Recalling every battery to fit more sensors even less practical than what is done now.

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[ct14garage]

As I thought, not enough sensors for definitive continuous measurement.
Recalling every battery to fit more sensors even less practical than what is done now.

It's LG's screw up. The Koreans have not been up to Porsche standards.

Hence the Macan EV has ditched LG and now uses CATL batteries. Wise move.

Taycan 9J1.2 uses an "improved" version of the 9J1 LG battery. Still made by LG of course.

 

[Vim Schrotnock]

As I posted in an earlier thread, Porsche's (one of three in the country) battery technician tested every module in my disassembled battery and identified one bad cell, and replaced another 'out of an abundance of caution'. This testing was done using the best methods and equipment that existed as of August 2022. I was told the battery would be 'as good as new, probably better'. Complete battery failure 10 months later.

If Porsche hasn't developed better test equipment and/or methods to diagnose module failure since then, I'm not optimistic they can develop a purely software based algorithm to do better.

 

[ct14garage]

I was told the battery would be 'as good as new, probably better'

He lied to you, whether knowingly or based on his training he genuinely thought the job was as good as new but lacks the experience to see the bigger picture. Remember it’s not about the job he did - but about the battery being flawed.

The bigger picture is that WRS1 affected cars, specially 2020 models. Will keep failing until all the modules have been replaced basically.

Of course, this is what my WRS1 affected customers do, because they don’t have official warranty here in Thailand. So whenever the battery fails they come to me and we change X modules.

After a while it fails again, so we change X modules again. On and on.

—

The dealer tho, should give those who have warranty a replacement battery. Because it is the only way to finish the problem once and for all

 

[Caraholic]

As I posted in an earlier thread, Porsche's (one of three in the country) battery technician tested every module in my disassembled battery and identified one bad cell, and one replaced another 'out of an abundance of caution'. This testing was done using the best methods and equipment that existed as of August 2022. I was told the battery would be 'as good as new, probably better'. Complete battery failure 10 months later.

If Porsche hasn't developed better test equipment and/or methods to diagnose module failure since then, I'm not optimistic they can develop a purely software based algorithm to do better.

same here replaced twelve modules back 14 months ago. Now back in the shop again with another two failed modules. Don’t have high hope of the new battery pack either from the gen 1.5. Second time I got in my new 25 loaner had the yellow battery symbol pop up. Granted it hasn’t popped up since then but not a great feeling.

 

[chun]

same here replaced twelve modules back 14 months ago. Now back in the shop again with another two failed modules. Don’t have high hope of the new battery pack either from the gen 1.5. Second time I got in my new 25 loaner had the yellow battery symbol pop up. Granted it hasn’t popped up since then but not a great feeling.

Maybe @ct14garage can give more details once/if he opens up a 2025 module eventually, if there are any differences compared to 2020/2021

 

[ct14garage]

Maybe @ct14garage can give more details once/if he opens up a 2025 module eventually, if there are any differences compared to 2020/2021

opened 2025 modules and batteries. It’s definitely an improved version. But still same old architecture/platform by LG. N

 

[Jasper4S]

opened 2025 modules and batteries. It’s definitely an improved version. But still same old architecture/platform by LG. N

Opened because they can short out too? Is the issue isolated to pre facelift models or a general Taycan issue?

 

[D00notD00d]

I share the scepticism that any software can reliably identify a latent manufacturing defect such ‘as a torn anode tab, a folded cathode tab, a peeled-off cathode or a double production topic pouch crack’. It may reduce the risk, but when the first fire occurs post onboard monitoring sw installation , the game is up.

I wonder what factory tests the battery manufacturer did simulating load, and what assumptions were made about the scope of battery management system monitoring and alerting? Vehicle manufacturers and importers are accountable for the safety of their products.

Porsche isn’t the only vehicle manufacturer retrofitting monitoring and alerting software to address battery hardware defects. I note Ford is giving extended warranties alongside their software installation. Of course any vehicle can catch fire, but ICE vehicles have had thermal fuses for some time.

 

[ct14garage]

Modules for Gen1 Battery: 9J1915591C/G/H/J
Modules for Gen2 Battery: 9J1915602D/E/F

The new modules have an improved chemistry, but it's essentially the same format and same architecture.

The new battery has remarkable improvement tho:

This thing which looks like a module is not, it's there to absorb humidity.
Which in the previous battery humidity is absorbed under each module by the liquid thermal interface under each module. Makes the situation I'm reporting on this thread much much worse. So a good change by Porsche.

Nevertheless, Tesla has had a water absorbent filter in their batteries for like the past 10 years..... and so has BYD

 

[D00notD00d]

For j1.2 has the cooling changed? I understand j1.1 is just bottom cooled, rather than around the cells.

 

[D00notD00d]

84 pages of Tesla Battery Management System patents, including sections on:

2. Detecting and Mitigating Internal Short Circuits
3. Detecting and Responding to Exceptional Charge Events
5. Enhancing Battery Safety Mechanisms
8. Preventing Thermal Runaway Propagation

Some in Section 2 were filed in 2007.

I don’t know how many here were implemente, but i couldn’t find a single Tesla fire safety recall on the EU regular site. But lots for other manufacturers.

NTHSA?

if only RHD Model S were still produced.

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