Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Sustainable Sidetra...
Energy Storage
Stability and safet...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Stability and safety of lithium batteries

 
Energy Storage
Last Post by batalto 5 years ago
5 Posts
3 Users
6 Reactions
2,589 Views
RSS
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4727
Topic starter 11/07/2021 9:57 am   [#89]

We recently reviewed a battery-operated ride on mower, and have received a few words of warning about how unstable (and potentially dangerous) lithium batteries can be when they get cold. I always take this feedback with a pinch of salt, but I've always known that batteries don't like cold, and I was wondering what the takeaway is for homeowners with battery storage (and EVs for that matter). Do you see a massive drop off on recharges during cold weather?

I'm really interested to learn more on this.


Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!


   
Quote
 Kev M
(@kev-m)
Noble Member Member
Joined: 5 years ago
Posts: 1276
11/07/2021 10:25 am  

@editor, Lithium batteries perform less well at hot and cold extremes but I think the serious problems occur (i.e. damage) when rapid charging takes place repeatedly at very low temperatures. This isn't likely in a home battery system (because the batteries are normally indoors) or a mower (because grass doesn't grow when it's that cold!).  EVs that are used all year round will suffer some range loss when it's cold and their battery management systems should slow down charging to protect the batteries. 



   
👍
2
ReplyQuote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4727
Topic starter 12/07/2021 10:18 am  

Thanks @kev-m. So is the sole issue that they don't recharge fully or only partially, and does this lead to battery damage in the long-term? I've also heard that in some circumstances, when batteries are cold and are recharged they can ignite. I imagine this must be quite rare. 


Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!


   
ReplyQuote
 Kev M
(@kev-m)
Noble Member Member
Joined: 5 years ago
Posts: 1276
12/07/2021 8:56 pm  

@editor, Mars, I'm at about the limit of my knowledge here but as I understand it, they recharge fully but slower, but a full charge doesn't deliver as much energy when it's cold because the chemistry at work isn't as efficient at lower temps. So to deliver the same regular amount of energy when it's cold you'd need more charging cycles, which theoretically would wear the battery out quicker.  

I'm not sure about fires but I also think they must be rare.



   
👍
2
ReplyQuote
 batalto
(@batalto)
Noble Member Member
Joined: 5 years ago
Posts: 1092
13/07/2021 2:01 pm  

I personally have FePO batteries which are different to the ones you are talking about and are better suited to energy storage. FePO are more stable, but less energy dense and heavier, this is better for home storage but obviously worse for vehicles. FePO are also more stable and have longer cycle lives but much less grunt output, again great for homes bad for cars.

https://blog.epectec.com/lithium-iron-phosphate-vs-lithium-ion-differences-and-advantages


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
👍
2
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Members Online

Click to access the login or register cheese
Protected By
Shield Security PRO