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[Révision] Maintenance of Li-ion battery of Prius plus

O

Ohid

Lecteur Inscrit
Hi, I am not french speaker. Hence, I posted in English.

I have Prius Alpha 7 seater with Li-ion battery same as Prius Plus. In Europe, lots of Prius plus users. How did you do maintenance of Li-ion battery?

Did you do any voltage balance among the cells? Actually, what is the maintenance procedures of this battery?

Kindly share your experience. Thanks.
 
There is no maintenance to do on the li-ion battery, no balancing.
You just have to make sure that the ventilation inlet stays clean, and if there is a filter you have, to clean it from time to time.
 
Thanks. It doesn’t have filter. I already cleaned fan 6 months ago. One thing worry me the blade voltage shown below 3.0 v now but it showed more than 3.6v one month ago. Total pack voltage remain same above 202v as before. I measured it by dr Prius app battery monitoring.
 
The li-ion battery has 56 cells of 3.6V for a sum of 201,6V
However, this nominal voltage will vary constantly during the operation of the vehicle. Hundreds of times over a 10 minutes trip.
The voltage varies around 3.6V with a variation between 3V and 4V in normal operation.
 
Dernière édition:
its true but most of the time it remained under 3.0 v. Now it hardly crossed 3.02v but before it always remained above 3.6v. My question is why Pack voltage not reduced if cell voltage decreased?
 
Hi, Are all the 56 cells sometimes under 3 V ? Hope not.
Do you have the 56 cells voltages ?
What is the total pack voltage range ?

I think that there is a top balancing system. Hardly 100% of the EV have one. I think the prius use NMC cells, like a lot of EV.
The main difference is that EV are grid charged and their pack is balanced when SOC is 100%.
 
In dr Prius app, it only shows blade voltage not all cells. Its not physically measured. Total pack voltage always remained at more than 201 voltage. If you visited the link posted above, you will find the photos of previous and present results. I am not able to post photo here. Thanks.
 
I only see 3 of your picture, I don't go on FB.
DrPrius tells you that at least one cell is low. 2.94 Volts is too low. At such voltage the Internal resistance of the cell is high during discharging, it will heat.
(Each cell voltage is physically measured)
So, your question is accurate, you need first to charge the lowest cell(s).
I don't have the maintenance manual, you could have such info at toyota TIS.

If you don't find a balancing procedure,
I am not sure, but may be top charging the whole pack could solve, several top charging, because the cell(s) with 3 V is far from the 3.6 V nominal of others cells.
During top charging, look at DRPrius in order to control that top cell don't go too high, not over 4.2 Volts.
Stay at this top charge level and look if the différence between lowest cell and highter is reduced at each time.
Don't do this top charging in high temperature conditions.

It is also possible to open the pack, measure each cell and recharge the lowest. BUT this is dangerous and need high voltage knowledge.
 
Thanks for your long answers. I am afraid, is it possible to top charging Li-ion cells like Nimh cells. I need to know whether anyone do the top charging for Prius plus li-ion battery cells.
 
Top charging is not dangerous. Your have only a cell(s) problem, not electronical one.
You can do this for exemple, without running, in mode D and foot on the brake pedal, engine running.
Just wait.
The prius will automatically stop the charge at top level (and reduce the power near the end)
During this charging look at DrPrius lowest cell voltage. It must go over 3 V.
Look also at top level cells.
Then stay at this charge level, don't drive.
 
My problem has started after doing load test. During load test as suggested by dr Prius I depressed both brake and accelerator pedals for charging the battery with D gear. Should I do that again for changing? It wont harm again my cells?
 
What where the lowest/highest voltages before your load test ?
Why did you do this test ? Did you have a dtc error code ?
Until the highest cells stay under 4.2 volts this load test is not dangerous.
Wait several hours after top charging before an other one, balancing could take time.

But if after this(these) load test the delta between high/low is still the same your need to go to a repair center.
I would look at toyota TIS info center.

Technically it is possible after opening: to charge the lowest cells/change a blade/change all the pack. But this is dangerous and need high voltage knowledge.
 
I did it using Torque pro and Hybrid assistant app. Here is the Torque report link
 
planetaire a dit:
What where the lowest/highest voltages before your load test ?
Why did you do this test ? Did you have a dtc error code ?
Until the highest cells stay under 4.2 volts this load test is not dangerous.
Wait several hours after top charging before an other one, balancing could take time.

But if after this(these) load test the delta between high/low is still the same your need to go to a repair center.
I would look at toyota TIS info center.

Technically it is possible after opening: to charge the lowest cells/change a blade/change all the pack. But this is dangerous and need high voltage knowledge.
Cliquez pour agrandir...
In Hybrid assistant and Torque pro, individual cell not measured but block voltage showed highest is 26.6 and lowest is 25.03 voltage at 60% & 39.6% SOC respectively.
 
What where the lowest/highest voltages before your load test ? <- This don't need individual cell voltage, just lowest/highest. For exemple lowest is visible in DrPrius
Why did you do this test ?
Did you have a dtc error code ?
Just remember that I don't have a FB access.
 
Before load test lowest voltage never went below 3.62v and highest voltage reached 3.8v. For your information, I have little chance to charge it at the highest level because I maintained my speed between 70-95 km/h. No error codes come. I did it only see the results of my battery health.
 
Please describe the load test you have done. Soc beginning, soc max and may be after the load test a discharge test ? if yes to which soc min.

Are these lowest/highest cell voltage live values or absolute one ? Check for exemple during driving if these values are changing.
If they are live data, give the 2 values with a soc near 65%.
 
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