Questions tagged [cell-balancing]
Cell balancing is a method of designing safer battery solutions that extends battery run time as well as battery life.
78 questions
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1 answer
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Wouldn't taking power from part of a lithium battery cause imbalance?
In the attached schematic of a bms, the mosfet gates require around 12v to switch on/off. So they are directly taking power at the 3rd cell B3. Wouldn't this cause imbalance with the remaining cells(...
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Purpose of Zener and Schottky Diodes on bq76952 Cell 0 Input (VC0) - TIDA-010208
I'm analyzing the cell balancing and monitoring circuit for the bq76952 AFE, specifically referencing the TIDA-010208 design. My focus is on the Cell 0 input (VC0), and I'm trying to understand the ...
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1 vote
1 answer
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Feasibility of CC-Only Charging Terminated by SoC (80-90%) - Concerns about Balancing and Accuracy?
My understanding is that many battery applications commonly terminate charging when the State of Charge (SoC) reaches 80-90%. This often aligns with the end of the Constant Current (CC) phase. The ...
1 vote
1 answer
87 views
Issue with Simulation of Lithium-ion battery dissipative balancer circuit in LTspice
I'm trying to understand the operation of this lithium-ion battery dissipative balancer circuit. I believe I have a good grasp of how it's supposed to work. I simulated it in LTspice, and it functions ...
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2 votes
2 answers
82 views
Battery Unbalancing Situation
I have a question about the battery pack design. The datasheet of the battery is attached to this question. The battery pack consists of 3 different module and each module contains 8 series and 2 ...
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Simulink - too much current is drawing from batteries
I am trying to simulate an active cell balancing circuit shown in the figure. However I have some problems. If I only turn on and of the switches I get normal,calculated current passing through ...
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2 answers
98 views
18650 cell will use ______ amps every _____mins?
I am looking at how to utilise the BQ77915 Ultra-Low Power Primary Protector with Autonomous Cell Balancing by TI, using eight 18650 cells, each with a BQ77915 IC allowing 3 series - 5 series cells. ...
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2 votes
1 answer
96 views
Active battery equalizer, max current?
I have two 2x12, 50Ah LiFePo4 batteries. Charged via 24V LiFePo4 charger Max current is 50A (By BMS). Real life: <15A discharge, 5A charge It is unclear, how to choose the right balancer, by ...
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1 vote
2 answers
441 views
Li-Ion BMS which protects parallel cells in addition to series cells
Background If li-ion cells are arrayed (series x parallel — S x P or P x S) to form a battery, it is generally recommended to manage parallel stacks of series cells (P x S) independently, such that ...
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1 answer
65 views
Lithium Ion Battery : Cell Array Configuration (V.batt when converting to ≤ 4[V] )
Question I am seeking to array 6x 21700 lithium ion battery cells, leaving the option for: 1S • 6P (@ V.batt.nom = 03.7 [V], range: 02.7—04.2 [V]) 2S • 3P (@ V.batt.nom = 07.4 [V], range: 05.4—08.4 [...
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Can I "Stack" 2-Cell Li-ion Battery Balancers for a 4-Cell battery?
I'm building a project where I need an internal rechargeable battery. I've decided to go with 4x 18650 Li-ion cells, so I can change them if necessary, the 4x 18650'ies will be used in series, for a ...
1 vote
1 answer
258 views
Secondary Connection for Transformers in Active Balancer using LTC3300-1
I am currently trying to implement an active balancer based on the LTC3300-1 (I have proposed the diagram based on the directions in the datasheet) but, about the connection for the secondaries of the ...
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1 vote
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Transformer connection for active balancer
I am currently looking to implement an active balancer based on the LTC3300-1 for a 3-S LiPo array but I am unsure with the transformers, the datasheet shows how to connect the IC for a 3-S array. I ...
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1 vote
1 answer
107 views
How to design an establish a battery topology with a BMS and charge transfer ("active") balancing
I read several documents about building batteries (e.g., for photovoltaic systems). I still have questions. 1.) LiFePO₄ cells have an internal resistance of a few mΩ. If you connect two such cells ...
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2 votes
4 answers
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Lithium battery pack charge controller and balancer module function (HX-4S-F30A)
I tried to use this module for a 4S 18650 battery pack: Beside charge controlling it is supposed to balance cells and this is where my issue emerges. If I put some unevenly charged cells in the pack, ...
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