What are the factors that influence the price of lithium battery?



Price composition of lithium battery            The price of lithium battery is mainly composed of three parts: the cell, the protection plate and the shell. At the same time, due to the power consumption and the current of the electrical appliances, the cost of the selection of the materials of the 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 plugs, 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, working 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!