Summary

Lithium battery price composition The price of lithium battery is mainly composed of three parts: battery cell, protective plate and shell. At the same time, due to the power consumption and current of the electrical appliance, the material of the connecting piece between the battery cells (conventional nickel sheet , formed nickel sheet, copper-nickel composite sheet, jumper, etc.) selection will affect the cost, different connectors.

First, the price composition of lithium batteries

The price of lithium batteries is mainly composed of three major components: cells, protective plates, and shells. At the same time, due to the power consumption and current of the electrical appliances, the material of the connecting sheets between the cells (conventional nickel sheets, formed nickel sheets) , copper-nickel composite sheet, jumper, etc.) selection will affect the cost, and different connectors (such as aviation plugs, ranging from ten yuan to thousands of yuan) may also have a greater impact on the cost. Different PACK processes also affect cost.

Second, the factors affecting the price of lithium batteries

1. Selection of battery cells

First, the selection of cells with different material systems will affect the price of the entire lithium battery. Lithium batteries include lithium manganate (3.6V), lithium cobaltate (3.7V/3.8V), lithium nickel cobalt manganate (commonly known as ternary, 3.6V), lithium iron phosphate (3.2V) depending on the positive electrode material. , lithium titanate (2.3V/2.4V) and other material systems, the voltage platform, safety factor, cycle times, energy density ratio, operating temperature, etc. of the cells of different material systems are different.

Second, the price of batteries of different brands will vary greatly. The total price gradient can be divided into: special batteries (including ultra-low temperature, ultra-high temperature, ultra-high magnification, special-shaped), Japanese (Panasonic, Sanyo, Sony), Korean Department (Samsung, LG), domestic (domestic is divided into first-line (Lishen, BAK, BYD, ATL), second-line, and even five-line, six-line), the same material system but different brands of batteries, the price The difference will also be very large, and the quality (safety, consistency, stability) of the batteries of each brand 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: basic protection includes overcharge, overdischarge, overcurrent and short circuit protection, and overtemperature 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 a power meter and LED.

BMS: BMS is the abbreviation combination of the first letter of BATTERYMANAGEMENTSYSTEM. It is called battery management system, commonly known as battery nanny or battery housekeeper. Extend battery life and monitor battery status. 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; balance management and thermal management. Subsystems are mostly used in electric vehicle batteries.

3. Demand and design of lithium battery casing

Lithium battery shell design can be divided into: PVC heat sealing, plastic, metal

PVC heat sealing: what kind of shell packaging form is used outside the battery pack mainly depends on the specific needs of the customer's products. For the packaging form using PVC heat sealing, it is generally suitable for a small number of cells in series and the overall weight is relatively light. (≤2kg), it can be used. However, for a battery pack with an overall weight of ≥ 1kg, it is necessary to add a fixed bracket between the cells, and then use PVC heat sealing after adding a glass fiber board for protection.

Plastic: Plastic shells are used, mainly because after different battery packs are shaped, the involved shells may need to be opened, and the cost of the molds is a lot of money. The strength is not as good as the material strength after the mold is opened and finalized), and the requirements for the material and process of the shell (especially with three-proof requirements) are different, which will also affect the cost.

Metal: The metal case is the same as the plastic case. Before the product is finalized or the quantity demand is small, it is recommended to use sheet metal sample preparation. This is mainly because the sample preparation and delivery time is short. If the batch is large, it is also recommended to open the mold. For metal shells that have waterproof grade requirements, it will also greatly affect the cost, and for metal shells of special materials (such as titanium alloys, etc.), the cost will be higher.

The cost of lithium batteries is mainly composed of cells, PCM, and structural parts, plus the company's PACK costs, aging costs, and management costs. At the same time, due to the technical difficulty of the product, the amount of purchase, and the requirements for the defective rate, the price of lithium batteries will vary greatly!

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