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After basic electrochemical performance testing, 18650 lithium-ion batteries can undergo in-depth performance research and select batteries with good consistency and low impedance for various performance tests. Most 18650 lithium-ion battery protection boards are designed with dedicated lithium-ion battery protection ICs and SMT MOSFETs, which have functions of overcharging, over discharging, and battery short circuit protection.

Test methods for 18650 lithium-ion batteries

1. Electrical testing: overcharging, over discharging, external torque circuit, forced discharge, etc.

2. Mechanical testing: falling, impact, puncture, vibration, compression, acceleration.

3. Thermal testing: fire, sand bath, hot plate, thermal shock, oil bath.

4. Environmental testing: pressure reduction, height, soaking, bacterial resistance, etc.

5. Capacity testing: The capacity testing of lithium-ion batteries is based on the parameters of full charge voltage and the set termination voltage. Since the minimum discharge voltage of lithium-ion batteries is 2.75V, a voltage less than 3V is no longer meaningful for lithium-ion battery testing; The fixed current discharge is generally expressed as how much C is used, and lithium-ion batteries are generally tested with a discharge of 0.5C.

6. Safety performance testing: The safety performance of lithium-ion batteries can be qualitatively and quantitatively evaluated through calorimetric analysis of the battery's thermal runaway process. The heat release rate and cumulative heat release of a battery at different temperatures are parameters that measure the thermal stability of the battery.

How to detect the depletion of 18650 lithium-ion battery pack batteries?

1. Battery loss performance: The battery voltage does not rise and the capacity decreases. Measure directly with a voltmeter, if the voltage at both ends of the 18650 battery is below 2.7V or there is no voltage. Indicates that the battery or battery pack is damaged. Normal voltage is 3.0V~4.2V (usually 3.0V batteries will have a voltage cutoff, 4.2V batteries will have a full charge saturation, and some may have 4.35V).

2. If the battery voltage is lower than 2.7V, you can use a charger (4.2V) to charge the battery. After ten minutes, if the battery voltage rises, you can continue to charge until the charger prompts for full charge, and then check the full charge voltage.

3. If the 18650 lithium-ion battery pack is measured and there is no voltage in the battery, there are two situations. One is that the battery was originally good and stored for a long time due to a lack of power. This type of battery has a certain chance of recovery. Generally, a lithium-ion battery pulse activation device (lithium-ion battery charging and discharging device) is used to charge the battery multiple times in a short period of time, which may be repaired.

4. Check the battery capacity, set a multimeter to measure the amount of current passing through each hour, and place two metal rods on the positive and negative metal terminals of the battery.

Application of 18650 lithium-ion battery protection board

Protective board, as the name suggests: a circuit board used for protective purposes. Not only 18650 lithium-ion batteries, but more accurately, all lithium-ion batteries need to be used. It is important to manage the overcharging, discharging, short term protection, and other aspects of the battery as a whole. You are probably the same as water and container.

When the faucet is turned on (battery charging), without protection, if the faucet is not turned off, water will continue to flow into the container (charging). When the container cannot fit, it will still flow in and water will overflow.

We all know that 18650 lithium-ion batteries, if not managed and controlled, will continue to charge, exceeding 4.2V, until they explode. It's what we call overcharging. Similarly, if discharged continuously, it will be below 2V. In this case, the user cannot afford to charge the phone, and the battery is basically scrapped. However, for professionals, low current charging is still possible, not completely over discharging. When discharged to 0V, the lithium-ion battery is completely scrapped. So there must be over discharge protection. In addition, there are also overcurrent and short term protection.

The 18650 lithium-ion battery has a protective plate, which can control the lithium battery cell to work in the specified working environment without explosion, combustion, and other phenomena; Lithium ion batteries without protective plates are prone to explosions, combustion, and other phenomena.

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