Introduction
We are going to identify dead cells in battery packs and replace them.
Beware - This tuto is higly experimental, Li-Ion cell present fire / explosion / burn hazards this guide is for educationnal purpose only and should not be reproduced without safety measures. Remember to always wear apropriate PPE and work in appropiate environment.
What you need
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Battery pack works by putting individual cells in parallel / series. Each cell has a nominal voltage / capacity and they are put together to give the whole battery pack it's global voltage / capacity.
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Here we have a 3s2p battery pack. This means that you have 3 serial attached blocks of 2 parallel cells.
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The lefmost block seems dead, the cells reads a steady 0 volts on my multimeter.
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The 2 other block show ~3.6 V which means they are still alive, great !
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I haven't tested individual cells from the 2 working blocks for a good reason. This battery pack has been stored for several monthes, if only one cell in the block was dead, the other (good) one would have discharged in it until it also dies ( which is what must have happen in dead block )
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Here I have 2 scrap 18650 cells form another dead battery pack. They are still charged but I have no fear has the battery electronics will balance the charge levels later.
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After this step, reassemble the pack and everything should be fine.
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Pour réassembler votre appareil, suivez les instructions dans l'ordre inverse.
Pour réassembler votre appareil, suivez les instructions dans l'ordre inverse.
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6 Comments
Salut, je pense changer toutes les cells dans ma batterie de laptop morte. J’ai actuellemt 6 x Samsung 26H. Est ce que je peux installer plus puissant ? Des LG HG2 18650 3.7v 3000mAh 20A High Drain Flat Top par exemple ? pour augmenter en duree et de vie de la batterie de mon laptop. Merci.
Bonjour Red B
Je ne sais pas comment fonctionne votre chargeur de batterie
CC (courant constant), CV (tension constante) ou CC-CV (tension constante avec courant limité).
Le premier (CC) prendra un peu plus de temps pour charger votre batterie.
Le HG2 est également un millimètre plus grand que le 26H.
Ci-joint deux liens vers leurs fiches techniques.
http://grobotronics.com/images/companies...
https://www.18650batterystore.com/v/file...
le HG2 est légèrement plus robuste que le 26H.
Bonne chance;
Homer 82
Sir, usually battery packs are hermetically sealed with glue, though it is not impossible to open the case. Still, it is time-consuming to separate the two plastic portions of the case. Kindly suggest how quickly I can open the battery pack and oblige. Often BMS is faulty kindly advise whether the BMS are interchangeable?
Best Regards
Dr P K Maitra BHILAI, INDIA dipalyconsultants@hotmail.com
Hello.
I don't have any experience yet, but I've found out that you can open the involucre that seals the battery with banana oil.
Leandro -
