幸运飞艇登录二维码nov 23, 2019 pageview：967
the price of lithium battery mainly consists of cells, protective board and shell. the power consumption and current of electric appliances, the material selection of battery connection (conventional nickel sheet, forming nickel, copper nickel composite plate, jumper, etc.) will affect the cost. different connectors (such as the aviation plug, from ten yuan to thousands yuan) may also affect the cost, and different pack process will also make a difference.
The selection of cells of different material systems will affect the price of lithium battery. According to different anode material of lithium-ion batteries, there is lithium manganese (3.6 V), lithium cobalt oxides (3.7 V / 3.8 V), NCM (commonly known as ternary battery, 3.6 V), lithium iron phosphate (3.2 V), lithium titanate (2.3 V / 2.4 V), and other material system of batteries. The batteries with different material system have different voltage platform, safety coefficient, recycling times, energy density ratio, temperature, etc.
different brands of batteries have different price. the total price gradient can be divided into: special batteries (including super low temperature, super high temperature, super high rate, abnormal one), japanese brand (panasonic, sanyo, sony), south korea brand (samsung, lg), domestic brand (chinese brand is divided into premium brand (lishen, bick, byd, atl), the second-tier brand, or even can be assigned to the fifth-tier brand, sixth-tier brand). batteries with the same material system but different brands will have different prices. the quality of each brand batteries after marketing evolution (security, consistency and stability) is basically proportional to the price.
pcm design can be divided into basic protection, communication and bms.
幸运飞艇登录二维码basic protection: basic protection includes over charge, over discharge, over current and short circuit protection. it can provide over temperature protection according to product requirement.
communication: communication protocol can be divided into i2c, rs485, rs232, canbus, hdq, smbus, etc., as well as simple power display, which can be indicated by power meter led.
the main purpose of the battery management system is to intelligently manage and maintain each battery unit, prevent the over-charging and over-discharging of the battery, extend the battery life and monitor the condition of the battery. its main functions include: real-time monitoring of battery physical parameters, battery state estimation, online diagnosis and early warning, charge, discharge and pre-charge control, balanced management and thermal management, etc. the secondary system is mainly used in electric vehicle batteries.
lithium battery shell design can be divided into: pvc heat seal, plastic and metal.
pvc heat seal: the specific type of outer shell package used for the battery pack mainly depends on the specific requirements of customer. pvc heat seal package is generally applicable to small amount batteries with relatively light weight (≤2kg). however, if the battery pack with the overall weight ≥1kg, it is necessary to make a fixed bracket between the batteries, and use pvc heat seal after the fiberglass board protection.
plastic: different battery pack needs open mold after finalize the design, and the mold fee is high. for example, using hand model for sampling if the product mold did not finished at the early stage of the development (the material strength of hand mold is worse than that of open mold) has different requirements on the material and process of shell (especially with three-proofing), and will also affect the cost.
幸运飞艇登录二维码metal: the metal shell is the same as the plastic shell. if product is not finalized or has less quantity demand, it is recommended to use sheet metal sample, so that the sample delivery time is short, and large batch is also recommended for open mold. if the metal shell has the waterproof level requirements, it will also greatly affect the cost, and special material (such as titanium alloy, etc.) metal shell requirements will have higher cost.
the cost of lithium battery is mainly composed of battery cell, pcm and structural parts. in addition, pack cost, aging cost and management cost should be included. due to the product technical difficulty, purchase amount and different defect rate requirements will affect lithium battery prices greatly.
as for the perspective of lithium battery composition, it mainly includes anode material, cathode material, electrolyte and separator. generally, anode materials account for 40%-46% of the total cost of lithium battery, which is the most important part in the lithium battery industry chain. the cost of each component is shown in the following table.
|Lithium battery cost composition||Lithium battery cost composition|
as for the technical difficulty of the product, separator, anode material and electrolyte have a certain technical barriers, while the cathode material is relatively simple, and the supply expands fast.
at present, the main technology route of anode materials includes lithium cobalt oxide, lithium manganese oxide, ncm (commonly known as ternary material) and lithium iron phosphate. the main new energy vehicle models tend to use ternary materials and lithium iron phosphate materials.
幸运飞艇登录二维码if the battery pack was a human body, the module was the "heart" that stored and released the energy that powered the car. lithium battery module is composed of several to hundreds of battery cells in parallel and series. in addition to the mechanism design, the battery management system and thermal management system can form a complete lithium battery package system.
the structural system is mainly composed of the top cover, tray, various metal supports, end plates and bolts of the