New answers tagged batteries
2
votes
How to force the FS312F (DW01A-G) battery protection IC to automatically enable itself when reaching the overdischarge release voltage or above
I was struggling with the same problem.
In my solution I have used the APX803L instead of the MAX809S. The APX803L has already a MOSFET inside which saves you one component.
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1
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How do I know if this battery is dead?
There are ten holes.
Put a probe in hole 1, then the other in 2, 3, 4, 5, 6, 7, 8, 9, 10.
Put a probe in hole 2, then the other in 3, 4, 5, 6, 7, 8, 9, 10.
Put a probe in hole 3, then the other in 4, ...
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0
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18650 battery pack. Current distribution
First, I see that 80 A is a relative current of about 4.5 C. That continuous current would discharge the battery in only 13 minutes. Most Li-ion cells would degrade quickly if treated that way. The ...
- 23.9k
1
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How to size parallel connections in a battery pack?
Am I sizing my parallel connections properly?
Theoretically yes, because, if all the cells are perfectly identical and all the wire lengths are the same and all the connections are perfect, then ...
- 23.9k
0
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How a battery is being charged and used as the same time?
Basic configuration
In this arrangement (see the schematics below), a voltage source Vin charges a battery BAT through a current-limiting resistor Ri. A load RL is connected in parallel to the battery....
- 18.2k
5
votes
Accepted
Power latching circuit MOSFET is stuck ON
Power latching circuit MOSFET is stuck ON
It's not stuck on. You've wired the P channel MOSFET incorrectly.
The body diode will always conduct giving you the impression that it is "stuck on&...
- 466k
0
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Confused about this BMS
The BMS measurement system should "see" the cell voltage as precise as possible.
Different BMS behave different if you omit the first and/or last wire. Some contain safety resistors, that ...
- 7,840
1
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Confused about this BMS
The wiring diagram is correct and the video is wrong.
And, by the way, do not solder directly to Li-ion cells! Buy cells with spot-welded tabs. Or get a spot welder.
what the purpose of those outer ...
- 23.9k
2
votes
Accepted
Current-limiter circuit messes with voltage measurement in my 12 V battery balancer PCB, and I dont understand why?
You need a connection between the battery and the circuit ground for your mosfet's to work.
Look at the circuity around Q9. To activate this mosfet, you need to lower the voltage on the gate. For this,...
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0
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How much charging voltage can a lead-acid car battery handle?
Well there is something called an 'equalizing' or 'conditioning' charge where voltages higher than normal are applied to a lead acid battery. This is done to equalize all the cells and also is used as ...
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1
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Voltage Response of Equivalent 1-RC Model for a Lithium Ion Cell
Here is what should be seen. Simulated with microcap v12.
OCV does not seem to be a "power supply".
It should be a "charged" capacitor with a "charge" (voltage) value.
...
- 14.9k
2
votes
Sodium batteries - How to manage batteries without a dedicated controller/monitor?
There are dedicated sodium-ion battery (钠离子电池) charging chips available (or at least announced), for example the CM1901AN.
Looks to me like they'll work okay with an ordinary lithium battery charging ...
1
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Sodium batteries - How to manage batteries without a dedicated controller/monitor?
Sodium-ion cells are quite similar to Li-ion cells. They both use the
"rocking-chair" technology of intercalation. They have a similar voltage range, though the range is wider in Na-ion ...
- 23.9k
2
votes
Can an offgrid inverter work directly from the MPPT charge controllers, without batteries?
These MPPT chargers have a constant current output to charge a battery. They're not designed to output a steady voltage, rather to adapt to whatever voltage the battery is at. And the inverter wants a ...
- 80.3k
0
votes
Is there a standard I2C/SM bus protocol for laptop battery packs
Most Battery "Gas Gauge" ICs adhere to a standard protocol for the first 16 address commands. These basic commands are common across the board and typically are all that's needed to monitor/...
2
votes
Rechargeable battery heats up when above insulaton got breached, why?
The whole cylinder is the negative bottom terminal.
When it was inserted into a toy incorrectly the spring connected the positive terminal with negative causing a short circuit, a large current went ...
- 164k
1
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How to choose a BMS for a 280 Ah LiFePO4 Battery?
The specified Eco-Worthy LiFePO4 battery pack already contains a BMS inside the pack. You don't need anything external to protect this battery pack.
If you want to interface with a computer for ...
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4
votes
Rechargeable battery heats up when above insulaton got breached, why?
The bottom part is one continuous can, image from the manufacturer's website:
I don't agree that it "should be isolated" under the insulation, however the insulation should be reasonably ...
0
votes
Accepted
4S LG M50LT Voltage Sag
3.6V is a typical discharge plateau for an ordinary Li-Ion cell. The cut-off voltage should be about 2.7 V, or down to 10.8V for 4S. This is the inherent property of Li-Ion battery technology.
...
- 41.8k
0
votes
Li-po battery balance charging circuit
The BD140 power transistor drives an LED with infinite current, but burns out at 1.5A current! The small 2sc9013's base also sinks this large current, burns out very quickly, until then adds about +0....
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