33V 30A Lithium Ion Battery: Diagnosing & Repairing Damaged BMS Module SSHHD96-1-REV3, SMD Fuse

Question

Hello I have a 33V, 30A lithium ion battery with a (most likely) damaged BMS module. It consists of 9 flat cells. The voltage on the battery cells (together) = 32V. Each of the cells individually has about 3.5V. For some reason, the BMS cuts them off and won't let the battery charge. BMS...

wojtek 9007 · Accepted Answer

Hello - it's probably a thermal protection (maybe a polymer fuse) Please compare it with this; Added after 1 [minutes]: It is marked as F 1

wojtek 9007 · Accepted Answer

Please double check the FRC1C protection. The Vgss voltage for the TPH4R008NA transistor is +/- 20V max.

wojtek 9007 · Accepted Answer

Hello - battery disconnected, resistance measurement between leads; Should ; T1 T2 = 1.0 -2.5 m? T2 T3 = 1.0-2.5m? T1 T3 ? 2-5 m? These are the fuse pins of the fuse. Whereas T2 T4 (heater)

michulus · Answer

F1 looks operational. I scraped off some varnish and at its output and input (T1 and T3 according to the application) I have 32V.

Where else to look for damage?

Added after 3 [hours] 8 [minutes]:

I measured the area of these rectangular TPH4R008NH MOSFETs.
Tensions as in the picture attached

Feet (1-4) on Q1A and Q12 = 30V to 31V
Feet (5-4) on Q1A and Q12 = voltage dropping from about 3V to 1V

Feet (1-4) on Q13 and Q13A = voltage dropping from approximately 3V to 1V
Feet (5-4) on Q13 and Q13A = voltage dropping from approximately 3V to 1V

Leads of TPH4R008NH according to the application

1, 2, 3: Source
4: Gate
5, 6, 7, 8: Drain

Observations and measurements:

1. It seems suspicious to me that there is about 30V on the gates (pin 4) on Q1A and Q12.

2. After connecting the battery cells and checking the paths, it turns out that there are some significant resistances (depends on how to apply the meter probes) between the Q1A and Q12 feet. There is no breakthrough between the gate and drain and entry. I guess Q1A and Q12 might be okay.

3. For Q13 and Q13A, in which way not to measure, it turns out that there is a breakdown between the input and the drain (

satanistik · Answer

BMS circuits are not that simple - You have to look at the IC on this board, sometimes it's a dedicated chip with a built-in processor and memory. After a failure, the processor can lock permanently or requires a reset.

michulus · Answer

I checked the voltage and resistance on FRC1C again. Measurements according to the markings of the terminals in the picture in the attachment. 1. Battery connected to bms, measurement with respect to (+) on the battery T1 = 31.96V T3 = 31.38V T4 = 0V T2 = 0V 2. Battery connected to bms, measurement between leads FRC1C T1T2 = 31.38V T1T3 = 0V T1T4 = 31.38V T2T1 = - 31.38V T2T3 = - 31.95V T2T4 = 0V T3T1 = 0V T3T2 = 31.95V T3T4 = 31.95V T4T1 = 31.37V T4T2 = 0V T4T3 = - 31.95V 3. Battery disconnected from bms, measurement of resistance between pins of FRC1C T1T2 break T1T3 = 2.2 MOhm T1T4 break T2T3 break T2T4 = 51 Ohm T3T4 break I have no ideas what else I can check without desoldering. Please give me further guidance.

michulus · Answer

Unfortunately, I do not have this FRC1C. 1. Can I replace it with SMD fuses? As I understand it would be 1x30A for T1 T2 and 1x30A for T2 T3. 2. Can a thermal fuse like FRC1C be soldered like SMD, or is it damaged due to the soldering temperature?

satanistik · Answer

You have to check if the processor does not expose voltage to the radiator, if so, it will also burn after soldering the new one. It is a controlled fuse that allows the driver to commit suicide, this is often stored in memory.

wojtek 9007 · Answer

Hello - please gently remove the outside with a knife or a thin screwdriver this protection housing (FRC1C). This is what it looks like on the laptop battery protection plates; Added after 42 :

michulus · Answer

Before I start dismantling, I would like to ask you something. I apologize for the (maybe) stupid question but I want to make sure that I got the (peasant) sense of the derivation of this FRC1C correctly. Could someone please confirm or improve my description

T1 = (before the bepiecznik) i.e. battery voltage input
T2 = (-) relative to processor logic
T3 = (after the bepiecznik) that is the voltage output from the battery
T4 = (+) voltage across the heater (if given by logic)

wojtek 9007 · Answer

Maybe it will help, figs 31 and 32

michulus · Answer

Fig. 31 shows a 3 lead fuse and the FRC1C has 4 leads. If possible, I would ask more specifically what and how on which FRC1C foot. In my understanding, T2 and T4 are power to the heater and T1 and T3 are a fuse (2x in series). I would write everything as below: T1 = (before the bepiecznik) i.e. battery voltage input T2 = (-) relative to processor logic T3 = (after the bepiecznik) that is the voltage output from the battery T4 = (+) voltage across the heater (if given by logic) I would ask for this description to be corrected if I mixed up something.

wojtek 9007 · Answer

Please gently pull off the outer case of FRC1C or write a detailed description what she looks like.

michulus · Answer

cover removed I desoldered and checked 4 Mosfets that I had suspicions about earlier. They are all ok. Added after 8 [hours] 59 [minutes]: I think I found the first damaged element. On the opposite side of the BMS, the one (as I guess) responsible for charging the battery. The MOSFET AON6576 is defective. It had a breakdown between the drain and the source and no insulation to the gate. It seems that it also stuck to the previously soldered Toshiba Mosfets. I would like to suggest what to replace it with: (it must be a MOSFET in the FDN8 5x6 housing) AON6576 datasheet ( Link )

wojtek 9007 · Answer

Hello - the most suitable (similar) is AON7528 To buy ; Added after 2 [minutes]:

michulus · Answer

I would like to ask about the connections (below picture and attachments) showing the U9 optocoupler and its surroundings.
The U9 markings are L217 G31 C. It comes out to me from the path analysis that U9 is a circuit responsible for switchgear and sources on Mosfet transistors.

Description:

U9 foot # 4 - it receives + 3.3V from the microcontroller (from foot 13)

U9 pin # 3 - output to the D13 diode and the Q1A, Q12 mosfet gates, and through the R19 resistor, to their sources.

U9 foot # 2 - output to the D14 diode (for the diode, the connection to the PACK- terminal), then to the Q13, Q13A mosfet gates. Through the resistor R16, at their source.

U9 kickstand # 1 - here's a strange thing! As I understand it, there should be voltage (+) on the foot # 1, but there is a R131 resistor (10K) and a DR diode on the way. The diode looks like it is soldered in the opposite way! The designation of the DR LED is WW N3. Checked (without desoldering) shows 723 mV in forward direction. A voltage of a few mV between the DR diode and pin 1 U9.

Questions:

1. Is my analysis correct and in fact the DR is soldered inversely at the factory?

2. How to decode WW N3 markings, maybe it's not an ordinary LED but some SMD Zener or something like that. How to identify it?

3. Is U9 labeled L217 G31 C surely a classic 217 optocoupler?

alain vicet · Answer

@michulus Hello, I have 10 batteries for bikes with the same BMS: SSHHD96 rev03 Were you able to repair your card? I also need some information on this map, especially about the functions of the white and blue wires. Do you know the functions of these 2 wires? thank you

33V 30A Lithium Ion Battery: Diagnosing & Repairing Damaged BMS Module SSHHD96-1-REV3, SMD Fuse

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Post #15

Post #16

Post #17

Post #18

Didn't find an answer? Ask Artificial Intelligence

Topic summary