Lithium polymer batteryUN38.3 certification is a standard for the safety of battery transportation. It mainly tests safety issues that may arise during battery transportation to ensure the safety of battery transportation. , the testing standard is UN38.3.
IEC62133 certification of lithium polymer battery is a certification for battery safety, a standard for testing the performance and life of batteries, and a test for the quality of batteries. Some batteries that are too bad will have a test. fails, if the test fails and the certificate cannot be issued, the manufacturer can only continue to test the product after rectifying it, then the certificate can be issued if it passes the test. Generally, this report is required when leaving the EU, and it is also the standard when applying for CB and KC.
The lithium battery pPolymer, also known as lithium polymer battery, is a chemical battery. Compared with previous batteries, it has the characteristics of high energy, miniaturization and light weight.
Lithium polymer batteries are ultra-thin and can be made into batteries of different shapes and capacities to meet the needs of certain products. The theoretical minimum thickness can reach 0.5 mm.
Basic Information
A general battery has three elements: a positive electrode, a negative electrode, and an electrolyte. The so-called lithium-polymer battery refers to a battery system that uses polymer materials in at least one or more of the three cells. In lithium polymer battery systems, polymer materials are mainly used in the cathode and electrolyte.
The positive electrode material uses conductive polymers or compoundss inorganic materials used in general lithium-ion batteries. The negative electrode often uses lithium metal or lithium carbon interlayer compounds, and the electrolyte uses solid or colloidal or organic polymer electrolytes. electrolyte. Since there is no excess electrolyte in lithium polymer, it is more reliable and stable.
Judge the quality of lithium batteries
1 Look at the cells
Most cells used in lithium batteries are for. Soft batteries and 18650 batteries, first check whether the batteries are new, because there are cases of unscrupulous small workshops using second-hand batteries to make lithium batteries.
Soft-packaged lithium battery, also known as polymer battery, is a soft-packaged battery containing a gel-type electrolyte that can be made into different shapes. The battery has high safetyed and will not explode. 18650, the electrolyte is in liquid state and has a large capacity, up to 3000 mAh, but it can explode and has a low safety factor.
2. Look at the weight
The weight of lithium batteries is directly proportional to the capacity. If it is a lithium polymer battery, if the weight difference is too large, the capacity. will certainly be insufficient. But some batteries have different capacities, so it's hard to tell, so it's better to find lithium battery manufacturers with a better reputation. In the battery industry, in order to reduce costs, many people use poor quality cells and protection boards. so be careful when buying to avoid making a mistake.
Advantages of lithium battery:
1. The energy is relatively high. It has high storage energy density, reaching 460 to 600 Wh/kg, approximately 6 to 7 times that of lead-acid batteries.
2. Long service life, service life can reach more than 6 years. The battery with lithium iron phosphate as the positive electrode has a charge and discharge record of 1C (100% DOD), which can be used 10,000 times.
3. The rated voltage is high (the operating voltage of a single unit is 3.7V or 3.2V), which is approximately equal to the series voltage of three nickel-cadmium or nickel-cadmium rechargeable batteries. metal hydride. , which facilitates the formation of a battery power supply; Lithium batteries can be a new type of lithium battery voltage regulator technology that adjusts the voltage to 3.0V to adapt to the use of small electrical appliances.
4. She has high power endurance. Among them, the lithium-ion iron phosphate battery used in electric vehicles can reache a charge and discharge capacity of 15 to 30°C, making it easier to start and accelerate at high intensity. .
5. The self-discharge rate is very low, which is one of the most important advantages of this battery. It can generally be less than 1%/month, or less than 1/20 of it. nickel-metal hydride batteries.
6. Lightweight, the weight is about 1/6 to 1/5 of lead products in the same volume.
7. It has strong adaptability to high and low temperatures and can be used in the environment of -20℃ to 60℃. After treatment, it can be used in -45℃ environment.
8. Green and environmentally friendly, regardless of production, use or disposal, it does not contain or produce toxic and harmful heavy metal elements and substances such as lead, mercury and cadmium .
Reference for the above content: Baidu Encyclopedia-Lithium Battery