What are the essentials for lithium battery safety detection

The safety detection of lithium batteries requires the following aspects: safety detections such as overcharge, short circuit, needle stick, squeeze, heavy object impact, etc. are required, and the battery does not fire or explode. 1. Extrusion detection: Place the overflowing lithium battery on a flat surface, apply a pressure of 13±1KN by a hydraulic cylinder, and squeeze the battery from the flat surface of a steel rod with a diameter of 32mm. Once the pressure reaches the maximum Stop squeezing, the battery does not catch fire and does not explode. 2. Impact detection: After the battery is overcharged, place it on a flat surface, place a steel column with a diameter of 15.8mm vertically in the center of the battery, and drop a 9.1kg weight freely from a height of 610mm onto the steel column above the battery. The battery does not catch fire or explode. 3. Overcharge detection: The battery is overcharged with 1C overcharge, and the overcharge experiment is carried out according to 3C overcharge 10V. When the battery is overcharged, the voltage rises to a certain voltage and stabilizes for a period of time. The battery voltage rises rapidly when it is close to the time. When it reaches a certain limit, the top cap of the battery is pulled off, the voltage drops to 0V, and the battery does not catch fire or explode. 4. Short-circuit detection: After the battery is overcharged, the positive and negative electrodes of the battery are short-circuited with a wire with a resistance of not more than 50m to detect the change in the surface temperature of the battery. The maximum temperature of the battery surface is 140℃. The battery cover is opened, and the battery does not fire or explode . 5. Needle puncture detection: Place the overflowing lithium battery on a flat surface, and puncture the battery in the radial direction with a steel needle with a diameter of 3mm. It is enough to detect that the battery does not catch fire or explode. 6. Temperature cycle detection: The temperature cycle experiment of lithium battery is used to simulate the safety of lithium battery when it is repeatedly exposed to low temperature and high temperature environment during transportation or storage. The experiment is carried out by using rapid and extreme temperature changes. . After the experiment, the sample should not fire, explode, or leak. The safety performance of portable lithium batteries can be qualitatively and quantitatively evaluated through the calorimetric decomposition of the battery thermal runaway process. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Is the electric bicycle better for lithium batteries or general batteries?