The problem of LED leakage has been encountered by many people. Some are found during production testing, and some are found when customers use it. The timing of leakage is also different. Some are found after the LED package is completed; some are appearing after being placed in the warehouse for some time; some are appearing after aging for a while; some are after the customer is soldered; some are appearing after the customer has used it for a while. The specific cause of the leakage problem has been plaguing the engineers of the packaging factory.
LED leakage
In the introduction, the reasons for LED leakage caused by some people are listed. According to my years of experience in dealing with LED problems and the use of LEDs, I believe that at present, the main reason for the most likely LED leakage is as follows:
(1) The chip is contaminated (-most important, high-issue problem)
(2) Silver glue is too high
(3) Wire welding
(4) Stress
(5) Improper use
(6) The chip itself leaks
(7) Improper process, causing chip cracking
(8) Static electricity
(9) Other reasons
I almost put the problem of static electricity to the end, almost subverting the understanding of the industry and even experts. Why put the static problem at the end, and then talk about the detailed reasons.
| Model | Nominal Voltage | Nominal Capacity | Nominal impedance | Dimension | Charge-discharge standard | Approx Weight | |||
| (V) | (mAh) | (mQ) | Diameter | Height | Charge | Discharge | ≈g | ||
| ICR10220 | 3.7 | 130 | <150 | 10 | 22 | 0.5C-1C | 0.5C-1C | 4.1 | |
| ICR10440 | 3.7 | 350 | <120 | 10 | 44 | 0.5C-1C | 0.5C-1C | 9 | |
| ICR14430 | 3.7 | 650 | <100 | 13.8 | 42.8 | 0.5C-1C | 0.5C-1C | 17 | |
| ICR14500 | 3.7 | 900 | <80 | 14 | 50 | 0.5C-1C | 0.5C-1C | 19.5 | |
| ICR17280 | 3.7 | 600 | <100 | 16.3 | 28 | 0.5C-1C | 0.5C-1C | 15 | |
| ICR17335 | 3.7 | 700 | <100 | 16.3 | 33.5 | 0.5C-1C | 0.5C-1C | 18 | |
| ICR18500 | 3.7 | 1400 | <70 | 18.1 | 50 | 0.5C-1C | 0.5C-1C | 33 | |
| ICR18650 | 3.7 | 2000 | <50 | 18.1 | 64.8 | 0.5C-1C | 0.5C-1C | 45 | |
| ICR18650P | 3.7 | 2000 | <40 | 18.1 | 65 | 0.5C-1C | 3C-5C | 45 | |
| ICR18650P | 3.7 | 2200 | <40 | 18.1 | 65 | 0.5C-1C | 3C-5C | 45 | |
| ICR18650 | 3.7 | 2600 | <70 | 18.1 | 64.8 | 0.5C-1C | 0.5C-1C | 45 | |
| ICR26650 | 3.7 | 3500 | <30 | 26 | 65.5 | 0.5C-1C | 0.5C-1C | 85 | |
| ICR26650P | 3.7 | 5000 | <30 | 26 | 65.5 | 0.5C-1C | 0.5C-1C | 85 | |
| ICR18650P | 3.7 | 1500 | <15 | 18.1 | 64.8 | 1C | 10C-15C | 47 | |
| ICR26650P | 3.7 | 2200 | <15 | 26 | 64.8 | 1C | 10C-15C | 64 | |
| IFR14430E | 3.2 | 400 | <115 | 13.8 | 43 | 0.5C-1C | 0.5C-1C | 15 | |
| IFR14500E | 3.2 | 400 | <95 | 13.8 | 50.2 | 0.5C-1C | 0.5C-1C | 15.5 | |
| IFR14500E | 3.2 | 650 | <80 | 13.8 | 50.2 | 0.5C-1C | 0.5C-1C | 17.8 | |
| IFR18500E | 3.2 | 600 | <80 | 18 | 50 | 0.5C-1C | 0.5C-1C | 19.5 | |
| IFR18500E | 3.2 | 1200 | <80 | 18 | 64.8 | 0.5C-1C | 0.5C-1C | 30.4 | |
| IFR18650E | 3.2 | 1500 | <65 | 18 | 64.8 | 0.5C-1C | 0.5C-1C | 40.5 | |
| IFR18650E | 3.2 | 1700 | <80 | 18 | 65.3 | 0.5C-1C | 0.5C-1C | 41.2 | |
| IFR26650E | 3.2 | 3400 | <20 | 26 | 65.3 | 0.5C-1C | 0.5C-1C | 87 | |
| IFR18650P | 3.2 | 1100 | <20 | 18 | 65.3 | 1-3C | 10-25C | 40 | |
| IFR26650P | 3.2 | 2400 | <20 | 26 | 65.3 | 1-3C | 10-25C | 82 | |
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