Lithium battery price configuration
the price of lithium battery is mainly composed of three main components: battery unit, protective plate and shell, which consume the power and current of electrical appliances at the same time, the materials of connecting plate (traditional nickel plate, formed nickel plate), copper nickel composite plate, jumper plate, etc.) will affect the cost, and other connectors (such as aviation plug, from tens of yuan to thousands of yuan) It may also have a great impact on the cost. Other pack processes also affect costs.
factors affecting the price of lithium battery
select the battery first:
first, the selection of batteries in different material systems will affect the price of the whole lithium battery. Lithium batteries have lithium manganate (3.6V), lithium cobalt (3.7V / 3.8V), lithium nickel cobalt manganate (usually ternary 3.6V) and lithium iron phosphate (3.2V), depending on the negative electrode material. Lithium titanate (2.3V / 2.4V) is different from batteries of other material systems, battery systems of different material systems, voltage platform, safety factor, cycle time, energy density ratio, working temperature, etc.
secondly, the prices of batteries of different brands may also vary greatly. The total price slope can be divided into special batteries (including ultra-low, ultra-high, ultra-high magnification and abnormal shape), Japan (Panasonic, Sanyo, Sony) and South Korea. (Samsung, LG), domestic (1 line in China (Lishen, BIC, BYD, ATL), 2 lines, even 5 lines, 6 lines), the price difference of the same material system and battery brand will also be very large, and the quality (safety, consistency, stability) of each brand battery will be basically proportional to its price through the market.
II. Demand and design of lithium battery PCM
PCM design can be divided into basic protection, communication and BMS
basic protection: basic protection includes overcharge, over discharge, overcurrent and short circuit protection. We can add overheating protection according to product requirements.
communication: the communication protocol can be divided into I2C, RS485, RS232, CANbus, HDQ, SMBus, etc. it has simple power indication, and the fuel indicator can be used together with LED indication.
BMS: BMS is the first letter of battery management system, commonly known as battery nanny or battery administrator. It is mainly used for intelligent management and maintenance of each battery device to prevent battery overcharge and discharge. Extend battery life and monitor battery status. The main functions include real-time monitoring of battery physical parameters, battery state estimation, online diagnosis and early warning, charging, discharge and precharge control, balance management and thermal management. The auxiliary system is mainly used for electric vehicle batteries.
requirements and design of lithium battery shell
the shell design of lithium battery can be divided into PVC heat seal, plastic and metal
PVC heat seal: the type of shell packaging used outside the battery pack mainly depends on the specific needs of the customer's products. When PVC heat seal packaging is used, it is usually suitable for a small number of batteries, and the total weight is light (≤ 2kg). However, for the battery pack with a total weight of more than 1kg, it is necessary to add a fixed bracket between the batteries and use glass fiber board to protect the peripheral equipment, Then use PVC heat seal. Plastic: plastic shell is used. After forming another battery pack, it may be necessary to open the relevant shell, and the mold cost is low. The strength is not as strong as the material after opening and setting the mold, and it will also affect the cost, because the requirements for the material and process of the shell (especially the three protection requirements) are different.
metal: the metal sheath is the same as the plastic sheath. It is recommended to use the sheet metal sample before forming or shaping the product. This is mainly due to the short delivery time of samples. The requirement for the waterproof grade of metal shell is not only expensive, but also significantly higher, because it greatly affects the requirements of special materials (such as titanium alloy) for metal shell.
the cost of lithium battery mainly includes battery, PCM and structural components, and the company's pack fee, aging fee and management fee must be increased. At the same time, due to the technical difficulty of products, purchase quantity and defect rate requirements, the price of lithium batteries also varies greatly!
What are the factors affecting the price of lithium battery
Lithium battery price configuration