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1、 Price composition of lithium battery

The price of lithium battery is mainly composed of three parts: cell, protective plate and shell. At the same time, due to the power consumption and current of electrical appliances, the selection of materials of connecting pieces between cells (conventional nickel piece, formed nickel piece, copper nickel composite piece, jumper piece, etc.) will affect the cost, and different connectors (such as aviation plug, from more than ten yuan to thousands of yuan) may also have a great impact on the cost, In addition, different pack processes will also affect the cost.

2、 Influencing factors of lithium battery price

1. Selection of electric core

First, the selection of cells with different material systems will affect the price of the whole lithium battery. According to different cathode materials, lithium batteries may have lithium manganate (3.6V), lithium cobaltate (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 material systems. The cells of different material systems have different voltage platforms, safety factors, cycle times, energy density ratio, working temperature, etc.

Second, the prices of different brands of cells will also vary greatly. The overall price gradient can be divided into: special cells (including ultra-low temperature, ultra-high temperature, ultra-high magnification and special shape), Japanese cells (Panasonic, Sanyo and Sony), Korean cells (Samsung and LG), domestic cells (domestic cells are also divided into first-line cells (Lishen, bick, BYD and ATL), second-line cells, and even five and six lines). Cells of different brands with the same material system, The price stability of each chip is basically in direct proportion to the survival of the superior and the survival of the inferior in the market.

2. 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, over-current and short-circuit protection. Over temperature protection can be added according to product requirements

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 power meter and led.

BMS: BMS is the abbreviation combination of the first letter of battery management system, which is called battery management system, commonly known as battery nanny or battery housekeeper. It is mainly used to intelligently manage and maintain each battery unit, prevent overcharge and overdischarge of the battery, prolong the service life of the battery and monitor the state 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 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

The design of lithium battery shell can be divided into: PVC heat seal, plastic and metal

PVC heat seal: what kind of shell packaging form is used outside the battery pack mainly depends on the specific needs of the guests. The packaging form of PVC heat seal is generally applicable to the case where the number of cells in series and parallel is small and the overall weight is light (≤ 2kg). However, for the battery pack with an overall weight of ≥ 1kg, it is necessary to add a fixed support between the cells, add glass fiber board on the periphery for protection, and then use PVC heat sealing.

Plastic: the plastic shell is mainly used. After different battery packs are finalized, the shell involved may need to be opened. The mold cost is not a small expense. For example, in the early stage of development, if the product is not finalized, the hand board shell can be used for proofing (the strength of the hand board is not as strong as that after the mold is opened and finalized). Different requirements for the material and process of the shell (especially with three prevention requirements) will also affect the cost.

Metal: the metal shell is also the same as the plastic shell. Before the product is finalized or there is little demand for quantity, it is recommended to use sheet metal sample preparation, which is mainly due to the short delivery time of sample preparation. If the batch is large, it is also recommended to open the mold. For the metal shell with waterproof grade requirements, it will also greatly affect the cost. In addition, 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 battery cell, PCM and structural parts. In addition, the pack cost, aging cost and management cost of the enterprise need to be added. At the same time, due to the different requirements of product technical difficulty, purchase amount and defect rate, the price of lithium battery will also vary greatly!