My .02 on this, and just a guess, the open loop charging parameters were not set right or charge limits for the battery were too high. The other way to kill LFP is large loads exceeding the battery max discharge current.
Closing the loop eliminates just about all of those issues. It brings the battery into the safety area of LA batteries that are still hard to beat offgrid. I am not saying you can't blow the top off a LA battery either Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail [email protected] [2] text 209 813 0060 On Thu, 17 Jun 2021 07:23:07 -0400, John Blittersdorf wrote: This just proves the weak link is the BMS. I had the honor of replacing the BMS in that exact model in a stack of 3 batteries. Luckily it was on the bottom shelf so I could pull the monster out onto the floor to get access to the lid. The lid is sealed shut but with persistence it opened. I was working with their tech support and following their instructions. I disconnected it from the other two that were in a parallel configuration before opening. Battery voltage was zero at the terminals. I did voltage checks at various checkpoints to confirm it was the BMS at fault. Relion sent a new BMS which I carefully installed and it has worked fine since. Had I seen this photo first, I may have not been so eager to see the inside of that battery. John Blittersdorf On Wed, Jun 16, 2021 at 6:13 PM Chris Worcester wrote: https://www.redwoodmaterials.com/recyclewithus [4] these folks are seriously getting into recycling lithium batteries, setting up house out by the Tesla giga factory out east of Reno. Chris Worcester [email protected] [5] 530-448-9692 Sent from my Samsung Galaxy s9. -------- Original message -------- From: jay Date: 6/16/21 12:49 PM (GMT-08:00) To: Jeff Clearwater , Jeff Clearwater , RE-wrenches Subject: Re: [RE-wrenches] Exploding LFP battery Hi Jeff, I don't know if you saw the photo. No cutting involved. The top is removed with roughly 14 fasteners. No tools or prying was involved in the removal of the top cover. jay On Jun 16, 2021, at 12:00 AM, Jeff Clearwater wrote: Hey Jay, So I don't believe ReLion batteries are openable - so it's most likely that when he decided to open it he cut into it and shorted the leads. As for recycling - first is health safety! I'd suggest he contact the manufacturer and get specific instructions for safing the mess. Will Prowess of DIY Solar Youtube channel had some leaky cells and the manufacturer sent specific instructions to contain and ship back the unit. You could contact him and he might know but the manufacturer might know better for that specific model. Hope that helps! Jeff C. Village Power Design frenergy [11] June 15, 2021 at 9:39 PM Very few details...What does it mean "he opened it up" I would even know how to do that with the L-ions I've been around, seems like its something a manufacturer should be doing. Temperature? charge rate? recent usage history? Age? Was it disconnected? Did contacts touch a conductor?........ You can probably get water to explode if you abuse it just right. Bill Feather River Solar Electric Bill Battagin, Owner 4291 Nelson St. [12] Taylorsville, CA 95983 [13] 530.284.7849 CA Lic 874049 www.frenergy.net [14] On 6/15/2021 8:14 PM, Jay wrote: -- ------------------------- [15] This email has been checked for viruses by Avast antivirus software. www.avast.com [16] _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org [17] List Address: [email protected] [18] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [19] There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ [20] http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org [21] List rules "> Jay [24] June 15, 2021 at 8:14 PM A fellow installer sent me this just now. The battery wasn't working, 5v. He opened it up and it exploded when he opened it. The lid hit the roof. Fortunately no one was injured. Anyone know what to do with this? IE recycling? And just another example of non explosive lithium batteries exploding Jay Peltz power. _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org [25] List Address: [email protected] [26] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [27] There are two list archives for searching. 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