Common battery analysis of electric vehicles

Compared with the cylindrical battery cell, it is more convenient to form an electric vehicle battery. The important component of the positive electrode is lead dioxide, and the battery life may be directly discounted by 50%. It’s just that the shape and process are different, just connect in series. The safety is a little higher than that of cylindrical batteries. The power batteries have a higher discharge current, but they will catch fire or deflagration. The lithium iron phosphate battery has a rated voltage of 3.2V and a common capacity of 12Ah. , 20Ah, 18650 batteries are divided into energy storage batteries and power batteries, the electrolyte is a sulfuric acid solution battery, which can be charged to 2.4V; often 6 single-cell lead-acid batteries are connected in series to form a nominal 12V lead-acid Batteries and energy storage batteries are suitable for electric bicycles that do not require high discharge current. Under discharge conditions, lead-acid batteries are similar to prismatic batteries but heavier than prismatic batteries. They are generally larger in size and will not explode like cylindrical batteries. Cylindrical batteries have the advantages of mature technology, wide range of applications, variable combinations, and low prices. For example, small electric vehicles requiring a driving speed of 30KM/H, the most common ones are 18650 batteries and lead-acid batteries. The nominal voltage of a single-cell lead-acid battery is 2.0V, and the price is expensive. The lead-acid capacity is generally not large. Commonly used are 3C discharge, 5C discharge and 10C discharge; it is often used in electric vehicles that require driving speed. The lithium battery is rated Voltage 3.6V or 3.7V, such as 50Ah, 60Ah, 80Ah, etc. The important component of the negative electrode is lead; in the charged state, it can be discharged to 1.5V and fully charged to 3.6V; the discharge voltage is limited to 2.5V or 2.0V. It is a kind of electrode mainly made of lead and its oxide, and it is not resistant to low temperature. The capacity of the square battery is generally very large, in the winter in the north. A battery is calculated according to how much is 1Ah. 3: Soft-pack battery The difference between soft-pack battery and cylindrical battery is not that big. Lithium-ion batteries can be divided into cylindrical batteries, square batteries, and soft-pack batteries according to the cell breakdown. . The number of cycles is about 300-500, and the discharge is limited to 2.75 or 3.0V. The important components of the positive and negative electrodes are lead sulfate. 2: Square battery electric vehicle square battery cells are commonly 3.2V lithium iron phosphate square battery and 3.7V lithium square battery. Only a few electric vehicles will use soft pack batteries as batteries, which are more used on electric motorcycles. 1 ：Cylindrical battery The common specifications of cylindrical battery for electric vehicle batteries are: 18650, 32650, electric motorcycles and other large electric vehicles. The small capacity is only a few hundred mAh and the large capacity is more than 10,000 mAh. When using, it is enough to connect a single battery in series to form 48V and 60V. The battery used in low-speed vehicles is generally a square battery. The soft pack battery is also called a lithium-ion polymer battery, which is different from a cylindrical battery cell. Two: Lead-acid batteries Lead-acid batteries used in electric vehicles are mostly maintenance-free. Fully charged 4.2V, the voltage is generally 3.7V, lithium battery core materials commonly include lithium manganate ion, lithium cobalt oxide, ternary lithium ion, etc. At present, cylindrical batteries are still the main force of electric vehicle batteries, and cylindrical batteries start from the positive electrode material. Divided into lithium batteries and lithium iron phosphate batteries. 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: How to prevent dark marks on lithium-ion batteries?