I. Background of Smart Traffic indicator Signs
   Intelligent traffic light signs are a type of smart traffic facility based on modern technology. The following will introduce them from the aspects of their functional features:
Adaptive adjustment: Through light sensors and other means, it automatically adjusts the brightness and color based on external factors such as weather and light to ensure clear visibility in various environments.
▲ Dynamic information update: Connected to the traffic flow monitoring system, it can capture real-time road condition information. In case of congestion, accidents, etc., it can quickly update the navigation route and prompt content, providing drivers with the best travel suggestions.
▲ Precise positioning and navigation guidance: By using GPS, Beidou satellite navigation system, etc., accurately determine one's own position and provide precise navigation guidance for pedestrians and drivers, including specific instructions such as direction, distance, turning and lane changing.
▲ Multimedia information display: Equipped with a high-resolution display screen, in addition to traditional text and arrow indications, it can also present navigation information in the form of graphics, animations, videos, etc., and supports voice navigation prompts at the same time.
▲ Multi-language interaction function: Supports switching between multiple languages, making it convenient for people from different countries and regions to use and eliminating language barriers.
▲ Intelligent perception and early warning: Equipped with vehicle-road coordination sensors, it can sense the speed and distance of surrounding vehicles. When it detects that a vehicle is changing lanes illegally or approaching a dangerous area, it can issue a warning.
▲ Integration with other intelligent systems: It can be seamlessly integrated with intelligent public transportation systems, urban security systems, parking lot management systems, etc., providing more convenient services.
   New energy lithium batteries, with their advantages of high energy density, long cycle life and environmental friendliness, have gradually become the preferred solution for intelligent traffic sign systems. This solution is designed to meet the application requirements of lithium batteries in intelligent traffic sign equipment projects, ensuring that lithium batteries can provide safe, efficient and customized power solutions for their equipment in special fields.

II. Analysis of Equipment Demand Characteristics
1. Equipment application characteristics
▲ Equipment type: Real-time communication and monitoring operations on various traffic roads, etc.
▲ Working environment: Temperature range, from -40℃ to +70℃, high temperature, extremely cold, high humidity environment, etc.
▲ Power demand: Large continuous/peak power, long battery life, and the voltage platform generally adopts 12V or 24V and other voltage platforms.

2. Core requirements for lithium batteries
▲ High safety: Meets the explosion-proof, shock-proof, waterproof and anti-interference requirements of the equipment under harsh working conditions.
▲ Long cycle life: ≥2000 times (80% capacity retention rate).
▲ Fast charging: Supports 1 to 2 hours of fast charging, suitable for high-intensity work.
▲ High-power discharge: The battery supports continuous high-current discharge, meeting the high-current requirements of high-power devices and ensuring their continuous and stable operation.
▲ Intelligent management: The BMS (Battery Management System) is equipped with functions such as overcharge protection, overdischarge protection, overcurrent protection, short-circuit protection, temperature protection, and fault diagnosis, making the battery more intelligent.
▲ Discharge temperature range: -40℃ to +70℃. In a low-temperature environment of -40℃, the battery's discharge efficiency is over 70%. A wider range of ambient temperature adaptability.
▲ Charging temperature: -20 ℃ to +50℃ range, with a wider adaptability to environmental temperatures.

III. Scheme Design
1. Battery selection
▲ Cell types: Ternary lithium batteries (ultra-low temperature, high energy density, high safety), lithium iron phosphate batteries (ultra-low temperature, high safety, long life), sodium-ion batteries (high safety, long life, good low-temperature performance). Different system cells are selected and matched according to different application scenarios.
▲ Battery combination configuration structure: Series and parallel schemes are designed based on the required voltage and capacity of the equipment to meet the requirements of different output voltage platforms.
▲ Structural design: IP68 protection grade, shock-resistant structure, explosion-proof enclosure (suitable for extreme environments or flammable and explosive environments).

2. BMS Management System
Core functions:
▲ Real-time monitoring of the voltage, temperature, SOC (State of Charge), and SOH (State of Health) of individual battery cells.
The battery charging active balancing technology enhances the consistency of usage among battery cells and extends the lifespan of the battery pack.
▲ The I2C/SMBUS/CAN/RS485 communication interface enables data interaction and communication with the main control system of the equipment.
The Coulomb computing method makes the battery SOC more accurate and the battery smarter.

3. Charging solution
▲ Charging equipment: Customized smart charger/charger/charging cabinet/solar photovoltaic, supporting constant current and constant voltage (CC-CV) charging.
▲ Charging strategy: Select fast charging or slow charging mode based on the working conditions to prevent battery overload.
▲ Intelligent control and management: Based on the technical performance characteristics of the battery, the battery charging process and fault diagnosis are intelligently controlled.

IV. Safety and Compliance
1. Safety protection
▲ Thermal management: By adopting a reasonable structural layout, thermal runaway is reduced. Air cooling/liquid cooling systems can be used (for high-power scenarios) to ensure temperature uniformity during battery use and effectively control battery thermal runaway.
▲ Fault protection: Multiple hardware protection mechanisms such as overcharge, overdischarge, short circuit, overcurrent, and over-temperature.
▲ Fault protection: Multiple hardware protection mechanisms such as short circuit, overcurrent, and over-temperature.
▲ Explosion-proof certification: The design can pass various safety regulations certifications.

2. Standard compliance
▲ It complies with national standards such as GB31241-2022 (Safety Technical Specification for Lithium-ion Batteries and Battery Packs for Portable Electronic Products), GB 17761-2024 (Safety Technical Specification for Electric Bicycles), GB/T 34131 (Lithium Batteries for Power Storage), GB 38031 (Safety Requirements for Batteries for Electric Vehicles), etc.
▲ How to obtain domestic and international certifications: GB certification, UN38.3 certification, UL certification, IEC certification, CE certification and other various certification requirements;

V. Project Implementation Plan

VI. Economic Benefit Analysis

1.In terms of cost
▲ The initial investment in the early development stage is relatively large, which gives it an absolute advantage in terms of long-term usage costs.
2. Energy-saving benefits:
▲ It adopts low-power consumption technology application and intelligent sleep mechanism to reduce electronic waste and lower carbon emissions.
3. Maintenance cost:
▲ The maintenance-free design allows for direct replacement after the service period, significantly reducing the cost of maintenance personnel.

VII. After-sales Service
1. Warranty period: 1 to 5 years of after-sales warranty, with a lifespan of 500 to 2,000 cycles or more (whichever comes first).
2. Remote monitoring: According to the actual demand status, the cloud platform provides real-time monitoring of the battery status and early warning of potential faults.
3. Emergency Response: Respond within 4 hours, provide solutions within 8 hours, and offer on-site technical support within 24 to 48 hours.

Hint:
▲ The plan needs to be refined based on specific equipment parameters (such as voltage, capacity, and size limitations).
▲ If special environments (high-altitude areas) are involved, corresponding protective designs need to be added.
▲ It is recommended to conduct joint debugging with the equipment manufacturer to ensure that the battery is compatible with the entire machine system