Hydraulic Power Tools: Cylindrical Lithium Battery Safety Test

Cylindrical high-power cadmium - nickel batteries have excellent high-rate discharge performance and occupy a dominant position in the market. However, due to the existence of pollution problems, they are gradually withdrawing from the stage of history. However, the market for hydraulic power tools is increasing, and countries around the world are working to develop electric motors. The environment-friendly lithium-ion battery for the tool replaces the nickel-cadmium battery. Green lithium ion battery has high energy, high specific power, low self-discharge, high charging efficiency, wide operating temperature, no environmental pollution, etc., it is far superior to the performance of nickel-cadmium batteries.

This type of battery can pass safety tests such as overcharge, short circuit, acupuncture, squeezing, and heavy impact. The battery does not catch fire and does not explode. Can be used in power tools.

Lithium-ion battery safety testing

Lithium- ion batteries use protective plates to protect the battery when used in power tools, but the protective plate cannot achieve 100% reliability in actual use . And there may be encountered outside charger failure or various other meaning. This requires that lithium-ion batteries must have good abuse and unpredictability. In the development process of lithium iron Phosphate lithium-ion battery for power tools, we need to test the battery for overcharge, short circuit, acupuncture, extrusion, and heavy objects.

Overcharge test:

The battery is fully charged with 1C and overcharged according to 3C overcharged at 10V . When the battery is overcharged, the voltage is stable for a period of time when the voltage rises to a certain voltage. The battery voltage rises quickly when the battery is near a certain time. When the battery rises to a certain limit, the battery is high. When the cap breaks and the voltage drops to 0V , the battery does not catch fire or explode.

Short circuit test:

After the battery is fully charged, the positive and negative poles of the battery shall be short-circuited with a wire with a resistance of no more than 50 m and the temperature of the surface of the battery shall be tested. The maximum temperature of the battery surface shall be 140 °C . The battery cap shall be pulled open, and the battery shall not catch fire or explode.

Acupuncture test:

Place the fully charged battery on a flat surface and pierce the battery radially with a 3 mm diameter steel needle. Test the battery without fire or explosion.

Squeeze test:

Place the fully charged battery on a flat surface. Apply 13 +1 KN compression force from the hydraulic cylinder. Extend the battery from the plane of a 32 mm diameter steel rod. Once the squeezing pressure reaches the maximum stop pressure, the battery will not burn. No explosion.

Heavy impact test:

After the battery was fully charged, it was placed on a flat surface. A 15.8mm diameter steel column was placed vertically in the center of the battery, and a weight of 9.1kg was freely dropped from the height of 610mm to the steel column above the battery. The battery does not catch fire or explode.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.