Battery knowledge

Basic knowledge of lithium-ion batteries

Structure of 1. lithium-ion battery

Five elements:

1. Cathode material: transition metal compound containing lithium.

2, negative electrode material: carbon material.

3. Isolation film: PP, PE class

4. Electrolyte: organic electrolyte containing lithium salt.

5. Packaging: soft packaging, steel shell, aluminum shell

Working principle of 2. lithium-ion battery

Lithium ions circulate between the positive and negative electrodes, and this tourism process is manifested as battery discharge or charging. Much

The first charging and discharging process of the battery is called battery activation: the SEI layer formed on the surface of the positive and negative electrode materials constitutes a stable interface. Much

Remove most of the impurities

Formation of a stable electrochemical system.

The activation process consumes part of the energy and constitutes part of the irreversible capacity.

The quality of the SEI layer largely determines the quality of the battery.

Environmental impact: 30-40 degrees best performance,>50 degrees attenuation acceleration is larger

3. battery instructions for use:

1, storage conditions, 50% charging state storage (single cell), can not be stored in 4.2V full state for a long time

2. Test conditions: temperature: 25 ℃ ± 5 ℃; relative humidity: 25% ~ 85%

3, the battery storage should pay attention to avoid its short circuit

4. Do not place the battery near a heat source or expose it to the sun for a long time. The rise in temperature will shorten the service life of the battery.

5, charging requirements, should use the manufacturer's approved charger and charging procedures. Inappropriate charging methods can cause the battery to heat up or damage.

Use "CCCV" or constant current and constant voltage charging. Ensure that the maximum charging voltage of each single battery is 4.25V. It is strictly prohibited to charge the battery (positive and negative electrodes are connected in reverse). The battery should be connected in an appropriate way. No floating charge.

Each battery should avoid discharging below 2.75V.

7, do not let the battery short circuit, battery short circuit will make the battery heat, serious will lead to fire. Battery short circuit will cause the battery core and wire joint temperature rise, avoid direct contact with it, so as not to burn the skin.

8. Do not bend or fold the battery or part of the battery, and do not tear off the sealant. This will damage the battery and seriously cause the battery to bulge, leak and catch fire.

9. Do not disassemble the battery. If the battery is squeezed unintentionally, causing the containment to leak, you must wear rubber gloves to deal with it. Avoid inhaling the leaked gas.

10. Other Precautions

Avoid contact with damaged or broken cell materials.

Injuries to the eyes: should immediately rinse the eyes with water and soap for no less than 15 minutes, and timely medical treatment.

Injuries to the skin: should be immediately washed with water and soap.

Inhalation of gas: should immediately breathe fresh air, and timely medical treatment.

Ingestion: Immediately receive medical treatment.

Keep the battery out of reach of children.

Do not heat the battery or throw the battery into fire, water or other liquids.

Do not put the battery in the microwave, washing machine or dryer.

Do not place the battery on the oven.

Do not use a damaged battery.