Lithium iron phosphate battery, lithium manganate, lithium cobaltite and ternary lithium battery
Lithium iron phosphate battery, lithium manganate, lithium cobaltite and ternary lithium battery are all branches of lithium-ion battery. Its performance is mainly applicable to power applications. At this time, it is called lithium iron phosphate power battery, also known as lithium iron battery. Therefore, the advantage of lithium iron phosphate battery mainly refers to its comparison with other batteries in power application. In this sense, we will mainly compare its comparative advantages with ternary lithium battery and lead-acid battery. 1、 High temperature resistance compared with ternary lithium battery. The high temperature performance of the lithium iron phosphate battery is better, which can withstand the high temperature of 350 ° C ~ 500 ° C, while the lithium manganate / lithium cobaltite is usually only about 200 ° C, and the modified ternary lithium battery materials will decompose at 200 ° C. 2、 Among them, the "elder" - the absolute advantage of long life. The cycle life of lithium iron phosphate battery is longer than that of lead-acid battery and ternary lithium battery. The "long life" of lead-acid battery is only about 300 times, up to 500 times; the theoretical capacity of ternary lithium battery can reach 2000 times, and the actual capacity will decline to 60% when it is applied to 1000 times; the real life of lithium iron phosphate battery is 2000 times, at this time, there is still 95% capacity, and its concept cycle life is more than 3000 times. 3、 Compared with lead-acid battery, it has many advantages: 1. Large capacity. The monomer can be made into 5Ah ~ 1000ah (1Ah = 1000mah), while the 2V monomer of lead-acid battery is usually 100Ah ~ 150Ah, with small change range. 2. Light weight. The volume of lithium iron phosphate battery with the same capacity is 2 / 3 of that of lead-acid battery, and its weight is 1 / 3 of that of the latter. 3. Strong fast charging capacity. The starting current of lithium iron phosphate battery can reach 2c, which can realize high rate charging; the current of lead-acid battery is generally between 0.1C ~ 0.2C, which can not achieve fast charging performance. 4. Environmental protection. There are a lot of heavy metals in lead-acid batteries, which produce waste liquid, while lithium iron phosphate batteries do not contain any heavy metals, so they are pollution-free in production and use. 5. High cost performance. Although the lead-acid battery is cheaper than the lithium iron phosphate battery because of its cheap materials, its economy in service life and daily maintenance is lower than the lithium iron phosphate battery. The results of practical application show that the performance price ratio of lithium iron phosphate battery is more than 4 times that of lead-acid battery. Although the application range of lithium iron phosphate battery is mainly in the direction of power, it can also be extended to more fields in theory, which is determined by the advantages shown in the above comparison. If we make some improvement in energy density and discharge rate, it is possible to enter into the traditional application field of other types of lithium-ion battery
Next: What are the factors that influence the price of lithium battery? abstract The price of lithium battery is mainly composed of three parts: cell, protection plate and shell. At the same time, due to the power consumption and current of electrical appliances, the selection of materials (conventional nickel sheet, formed nickel sheet, copper nickel composite sheet, jumper sheet, etc.) for connecting pieces between cells will affect the cost. Different connectors Price composition of lithium battery The price of lithium battery is mainly composed of three parts: cell, protection plate and shell. At the same time, due to the power consumption and current of the electric appliances, the cost of the selection of connecting pieces between the cells (conventional nickel piece, formed nickel piece, copper nickel composite piece, jumper piece, etc.) will be affected. Different connectors (such as aviation plug, from ten yuan to thousands of yuan) are also possible It has a great impact on the cost, as well as different pack processes. Factors influencing the price of lithium battery 1、 Selection of electric core: First, the selection of different materials will affect the price of the whole lithium battery. According to the different cathode materials, lithium manganate (3.6V), lithium cobaltite (3.7V / 3.8V), nickel cobalt lithium manganate (commonly known as ternary, 3.6V), lithium iron phosphate (3.2V), lithium titanate (2.3V / 2.4V) and other materials, the voltage platform, safety factor, cycle use times, energy density ratio, operating temperature of different materials are different. Second, the prices of different brands of electric core will vary greatly. The total price gradient can be divided into: special electric core (including ultra-low temperature, ultra-high temperature, ultra-high magnification, and heteromorphic), Japanese Series (Panasonic, Sanyo, Sony), Korean series (Samsung, LG), domestic series (domestic series is divided into one line (Lishen, bik, BYD, ATL), two lines, and even five lines and six lines), the same as The price difference of different brands of electric core in material system will be very large, and the quality (safety type, consistency, stability) of each brand of electric core through the survival of the fittest in the market is basically proportional to the price. 2、 Demand and design of lithium battery PCM PCM design can be divided into: basic protection, communication, BMS Basic protection: the basic protection includes overcharge, over discharge, over-current and short-circuit protection, and the over temperature protection can be added according to the product demand Communication: the communication protocol can be divided into I2C, RS485, RS232, CANbus, HDQ, SMBus, etc. there is also a simple power display, which can be indicated by LED with a power meter. BMS: BMS is the first letter combination of batterymanagementsystem, which is called battery management system, commonly known as battery nanny or battery housekeeper. It is mainly for intelligent management and maintenance of each battery unit, to prevent over charging and over discharging of battery, to extend the service life of battery, and to monitor the state of battery. Its main functions include: real-time monitoring of battery physical parameters; battery state estimation; online diagnosis and early warning; charge, discharge and precharge control; balance management and thermal management. The secondary system is mostly used in electric vehicle batteries. 3、 Demand and design of lithium battery shell Lithium battery shell design can be divided into: PVC heat seal, plastic, metal PVC heat seal: what kind of enclosure is used for the external part of the battery pack mainly depends on the specific needs of the customer's products. For the packaging form of PVC heat seal, it is generally applicable to the case where the number of parallel cells is small and the overall weight is light (≤ 2kg). However, for batteries with an overall weight of more than or equal to 1kg, it is necessary to add a fixed bracket between the cells and a glass fiber board around the battery, and then use PVC heat seal. Plastic: the plastic shell is used, mainly after different battery groups are finalized, the shell involved may need to be mold opened, and the mold cost is not a small expense. For example, in the early stage of development, the product is not finalized, you can use the hand plate shell proofing (the strength of the hand plate is not as strong as the material strength after mold opening and finalization), and the requirements for the material and technology of the shell (especially with the three proofing requirements) are different, but also Impact costs. Metal: the metal shell is the same as the plastic shell. Before the product is not finalized or the quantity demand is not much. It is recommended to use sheet metal to make samples. This is mainly because the sample preparation and delivery period is short. If the batch is large, it is also recommended to open the mold. For the metal shell with waterproof level requirements, it will also greatly affect the cost, and for the metal shell with special materials (such as titanium alloy, etc.), the cost will be higher. The cost of lithium battery is mainly composed of cell, PCM and structural parts. In addition, pack cost, aging cost and management cost of the enterprise are required. At the same time, the price of lithium battery will vary greatly due to the different requirements of product technical difficulty, purchase amount and defect rate!