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 significantly impact the price. Other 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) depends 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.

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 huge, and the quality (safety, consistency, stability) of the storms of each brand through the survival of the fittest in the market is proportional to the price.

2. Demand and design of lithium battery PCM
PCM design can be divided into essential protection, communication, BMS
Basic safety: critical protection includes overcharge, over-discharge, over-current, and short circuit protection, and over-temperature protection can be added according to product requirements
Contact: 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. A battery management system is commonly known as a battery nanny or battery housekeeper. Extend battery life and monitor battery status. Its main functions include:
Real-time monitoring of physical battery parameters.
Battery state estimation.
Online diagnosis and early warning.
Charge, discharge, and pre-charge control.
Balance management and thermal management.
Subsystems are primarily 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. The packaging form using PVC heat sealing 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 ≥ 1 kilograms, it is necessary to add a fixed bracket between the cells and then use PVC heat sealing after adding a glass fiberboard for protection.
Plastic: Plastic shells are used, mainly because after different battery packs are shaped, the tough shots 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 are short. If the batch is large, it is also recommended to open the mold. It will also significantly affect the cost for metal shells with waterproof grade requirements. The price will be higher for metal shells of unique materials (such as titanium alloys, etc.).

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!