4/9/2023 0 Comments Ryobi 40v battery![]() So it's simple enough to simply solder a wire to CL1- (which is pack ground) and CL10+ and have direct access to the pack without the BMS. Note that the MOSFETs switch ground to the power tab -, while CL10+ and power tab + are connected directly together. ![]() The two half packs are joined with the tab between CL5+ and CL6. So CL1- is pack ground, while CL10+ is the pack positive terminal. The BMS has access points to every terminal for each of the cells in the pack that can be tapped. The BMS can be completely bypassed, thus creating the option of both parallelization and alternative charging. So my primary interest is in paralleling the packs and alternative charging methods. ![]() I want to package 4 of them together as a pack for my black and decker 36V self propelled lawm mower. I suspect that T1 is used to indicate to the charger that the FETs are turned off and thus the pack is disabled-and on the path to discharge and destruction. If defective then it won't try to charge the pack. Still trying to determine what function they provide, but the charger has several LED indications, one for self check of the charger, another for checking if the pack is defective. The T2 terminal is found on some of the tools: mower, chainsaw, and ? (seems to be tools that have a high current draw) adding sketch of charger T1 circuit in post # 67 The unknown chip in the charger is IC3, an ABOV ADC2011 28-pin TSSOP ic, looks like some sort of microcontroller, possibly an 8051 core? ![]() There is a pull-up 10k R47 to the +5V buss, then Q9 is used to regulate that feedback voltage mentioned above, the base is driven by IC3 pin 23. Drop 0.6 across the diode and that puts T1 at 1.5 VDC the ground reference is with respect to the Pack (-) connector terminal which is 2 FET Vds(ON) above the bottom of the Cells. IC2 is a quad op amp, AS324M-E1, and there is a voltage feedback loop on op1 comparing the voltage going to T1 with a divider at 2.143 V (before diode D10) with output driving the base of Q6 with collector signal to IC3 pin 8. It measures 5.0 VDC when plugged into the mains when not charging, and 1.5 VDC while charging. The T1 terminal on the pack is also present on the charger units and is labelled as "COM" on the charger circuit board Identify the small transistor part numbers and how the charger communicates to the battery in post #67. How to do a Reset on the board-see post #91 for the old packs, and post #135 for the newer ones.Ĥ. Driving the FETs, Ryobi 40V BMS troubleshooting and repairģ. T1 and T2 terminals, what is the function? Ryobi 40V BMS troubleshooting and repairĢ. The LG and Samsung cells (10s2p 18650) that are used have no-explosion and no-fire specifications for both over charge and discharge, so it is a big waste of cells-just check out all the folks trying to sell their junk pack on ebay because it won't charge or work anymore.ġ. The bms chip seems to have a permanent failure mode "feature". Many have been disassembled to find perfectly good cells but the BMS has shut off the pack. Ryobi makes a bunch of power tools that use these packs, but the packs seem to fail quite prematurely and often. When it gets enough critical mass i may start a github or hackaday project for collaboration and sharing. I plan to put an index here in the first post of the schematics and any firmware that i can extract. ![]() Add link to the 18V thread, Ryobi 18v lithium battery. ![]()
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