Price composition of lithium battery
The price of lithium batteries is mainly composed of three parts: core, protective plate and shell. At the same time, due to the power consumption and current of the appliances used, the selection of materials (conventional nickel sheet, moulded nickel sheet, copper-nickel composite sheet, cross-joint sheet, etc.) between the batteries will affect the cost. Different connectors (such as aviation plugs) will affect the cost. From more than a dozen yuan to more than a thousand yuan.) It may also have a greater impact on the cost, and different PACK processes will also affect the cost.
Factors affecting the price of lithium batteries
1. Selection of electric core:
First, the selection of the core of different material systems will affect the price of the whole lithium battery. According to the different cathode materials, lithium manganate (3.6V), lithium cobalt (3.7V/3.8V), lithium nickel cobalt manganate (commonly known as ternary, 3.6V), lithium iron phosphate (3.2V), lithium titanate (2.3V/2.4V) and other materials will be used in lithium batteries. The cores of different material systems have their voltage platforms, safety factors and recycling times. Number, energy density ratio, working temperature and so on are different.
Second, the prices of different brands of cores will vary greatly, and the overall price gradient can be divided into: special cores (including ultra-low temperature, ultra-high temperature, ultra-high rate, abnormity), Japanese (Panasonic, Sanyo, Sony), Korean (Samsung, LG), domestic (domestic is divided into first-line (Lishen, Bike, BYD, ATL), and second. Lines can even be divided into five or six lines. The price difference between the same material system and different brands of cores will be very large, and the quality (safety, consistency, stability) of the cores of different brands eliminated through the market is basically proportional to the price.
Two, the demand and design of lithium battery PCM
PCM design can be divided into: basic protection, communication, BMS
Basic protection: Basic protection includes overcharge, overdischarge, overcurrent and short circuit protection. Overtemperature protection can be added according to product requirements.
Communication: Communication protocols can be divided into I2C, RS485, RS232, CANBUS, HDQ, SMBUS, etc. There is also a simple power display, can use the power meter using LED instructions.
BMS: BMS is the first letter combination of BATTERYMANAGEMENTS YSTEM. It is called battery management system. It is commonly known as battery nanny or battery steward. It is mainly for intelligent management and maintenance of each battery unit to prevent battery from overcharging and overdischarging, prolong battery life and monitor battery status. Its main functions include: real-time monitoring of battery physical parameters; battery state estimation; online diagnosis and warning; charge, discharge and pre-charge control; balance management and thermal management. The sub system is mostly used in electric vehicle batteries.
Three, lithium battery shell demand and design
The design of lithium battery shell can be divided into: PVC thermal seal, plastic, metal.
PVC heat seal: What kind of encapsulation form is used outside the battery pack mainly depends on the specific needs of the customers. For the encapsulation form of PVC heat seal, it is generally suitable for the case that the number of cores in series and parallel is small and the overall weight is light (<2kg). However, for batteries whose overall weight is more than 1 kg, it is necessary to reinforce the bracket between the cores and use PVC heat seal after adding glass fibre board protection to the periphery.
Plastic: After using plastic shell, mainly different batteries, the shell involved may need to be molded. The cost of the mould is a large expense. For example, in the early stage of development, the product is not finalized, the hand plate shell can be proofed (the strength of the hand plate is not as good as that of the material after the mold is molded), the material and technology of the shell can be used. (especially with three requirements), different requirements will also affect the cost.
Metal: The metal shell is the same as the plastic shell. There is not much demand before the product is finalized or in quantity. It is suggested that sheet metal be used for sample preparation. This is mainly due to the shorter sample delivery time. If the batch is large, it is also recommended to open the mould. For metal shell with waterproof grade requirements, will also greatly affect the cost, and is the special material (such as titanium alloy) metal shell requirements, the cost will be higher.
The cost of lithium batteries is mainly composed of cores, PCM and structural components. In addition, the cost of PACK, aging and management of enterprises should be added. At the same time, the price of lithium batteries will vary greatly due to the technical difficulty of the products, the amount of purchasing, and the requirement of bad rate.
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