As the core power of new energy vehicles, power batteries are related to the battery life of electric vehicles. At present, there are three main types of new energy electric vehicle batteries in the markets：

Lithium Iron Phosphate Battery

During the charging process, some of the lithium ions in the lithium iron phosphate are extracted, transferred to the negative electrode through the electrolyte, and embedded in the negative electrode carbon material; at the same time, electrons are released from the positive electrode and reach the negative electrode from the external circuit to maintain the balance of the chemical reaction. During the discharge process, lithium ions are extracted from the negative electrode and reach the positive electrode through the electrolyte. At the same time, the negative electrode releases electrons and reaches the positive electrode from the external circuit to provide energy for the outside world.

Features:

1. High energy density. In 2019, some excellent battery manufacturers can probably achieve the level of energy density of 175-180Wh/kg, and some manufacturers use the lamination process, and the energy density can reach 185Wh/kg;

2. Good safety performance. The electrochemical performance of the positive electrode material of lithium iron phosphate battery is relatively stable, which determines that it has a stable charging and discharging platform. Therefore, the structure of the battery will not change during the charging and discharging process, and it will not burn and explode. And even under special conditions such as short circuit, overcharge, extrusion, acupuncture, etc., it is still very safe;

3. Long cycle life, the 1C cycle life of lithium iron phosphate batteries generally reach 2,000 times, or even more than 3,500 times, while the energy storage market requires more than 4,000-5,000 times, ensuring a service life of 8-10 years, which is higher than that of ternary battery, the cycle life is more than 1,000 times, while the cycle life of the long-life lead-acid battery is about 300 times;

4. Safe and environmentally friendly, lithium iron phosphate batteries do not contain any heavy metals and rare metals, are safe, non-toxic and pollution-free, and are absolutely green and environmentally friendly batteries. Since the whole production process of lithium iron phosphate material is clean and non-toxic, all raw materials are non-toxic and non-polluting.

Ternary Polymer Lithium Battery

Ternary polymer lithium battery refers to a lithium battery in which the positive electrode material uses nickel diamond lithium manganate (Li(NicoMn)O2) or nickel diamond lithium aluminate ternary cathode material, and the ternary composite cathode material is nickel salt, diamond salt , manganese salt as raw material, the proportion of nickel, diamond and manganese can be adjusted as necessary.

Feature:

1.High energy density, the theoretical energy density reaches 280mAh/g, and the actual capacity density of the product exceeds 150mAh/g;

2. Good cycle performance, excellent cycle stability at room temperature and high temperature;

3. The voltage platform is high, and the cycle is stable and reliable within the voltage range of 2.5-4.3/4.4V;

4. Long cycle life, the capacity can keep more than 80% after 500 cycles;

5. Ideal crystal structure, small self-discharge and no memory effect.

NiMH Batteries

NiMH battery is a kind of battery with good performance. Ni-MH batteries are divided into high-voltage Ni-MH batteries and low-voltage Ni-MH batteries. The positive active material of nickel-hydrogen battery is Ni(OH)2 (called NiO electrode), the negative active material is metal hydride, also called hydrogen storage alloy (electrode is called hydrogen storage electrode), and the electrolyte is 6mol/L potassium hydroxide solution. As an important direction of hydrogen energy application, nickel-metal hydride batteries have attracted more and more attention.

Feature:

1. Strong reliability, good over-discharge and over-charge protection, high charge-discharge rate resistance and no dendrite formation. Has good bit characteristics. The energy density reaches 60mAh/g.

2. Long cycle life, up to thousands of times.

3. Excellent low temperature performance, the capacity does not change significantly at -10 °C

What are the test contents for New energy electric vehicle batteries？

Electrical test

1. Overcharge

2. Short Circuit

3. Over discharge Protection

4. Temperature

5. Imbalanced Charging

6. Dielectric Voltage Withstand

7. Isolation Resistance

8. Continuity

9. Failure of Cooling/Thermal Stability System


Mechanical test

1. Rotation

2. Vibration Endurance

3. Mechanical Shock

4. Drop Test

5. Crush Test


Environmental testing

1. Thermal Cycling

2. Salt Spray

3. Immersion

4. External Fire Exposure

5. Single Cell Failure Design Tolerance

Sinuo specializes in providing new energy electric vehicle battery testing equipment, and we can provide non-standard customization according to customer's test sample specifications and test requirements. Welcome to inquire!