I. Background of Home Energy Storage Systems
▲ Energy transition and environmental protection demands
Global energy transition trend: Against the backdrop of global energy transition, the utilization of renewable energy is constantly increasing, and the number of distributed power generation devices such as solar photovoltaic panels installed in households is gradually growing. Household energy storage can store excess electricity and improve the consumption and utilization efficiency of renewable energy.
▲ Enhanced environmental awareness: As people's environmental awareness improves, more and more families hope to reduce carbon emissions. Home energy storage combined with photovoltaic power generation and other renewable energy power generation systems can provide clean electricity, meet household electricity needs, and reduce reliance on traditional fossil energy.

Driven by economic factors
▲ Electricity price fluctuations and peak-valley price differences: Changes in energy prices lead to fluctuations in electricity prices, with significant differences in peak-valley electricity prices in some regions. The home energy storage system can charge during off-peak hours and discharge during peak hours, helping household users reduce their electricity costs.
▲ Investment returns and subsidy policies: Some countries and regions offer policy support such as subsidies and tax reductions for the installation of energy storage systems in households, which reduces the initial investment cost for users and increases the return on investment.

Energy security and reliability requirements
▲ Power grid stability issues: In some areas, the power grid infrastructure is weak or affected by extreme weather and other factors, resulting in unstable power supply and frequent power outages. Home energy storage can serve as a backup power source during power outages to ensure the basic electricity needs of the household.
▲ Dealing with emergencies: During natural disasters, public health events and other emergencies, home energy storage can ensure that the family has an independent power supply in emergency situations, improving the family's emergency response capacity and living security level.
Technological progress drives
▲ Maturity of energy storage technology: The continuous development of energy storage technologies such as lithium-ion batteries has gradually improved their performance in terms of energy density, cycle life, and safety, while costs have gradually decreased, making home energy storage systems more economically feasible, safe, and reliable.

Market development and consumption upgrade
▲ The market potential is huge: With a large number of households around the world, as people's demands for energy autonomy, environmental protection, and safety increase, the market potential for home energy storage is huge.
   New energy lithium batteries, with their advantages of high energy density, long cycle life and environmental friendliness, have gradually become the preferred solution for home energy storage systems. This solution is designed to meet the application requirements of lithium batteries in home energy storage system 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: Used as a backup power source for individual household users.
▲ Working environment: Temperature range, from -20℃ to +70℃, normal temperature environment, etc.
▲ Power demand: Large continuous/peak power, long battery life, and the voltage platform generally adopts 24V or 48V and other voltage platforms.

2. Core requirements for lithium batteries
High security: Mature and standardized technology, with minimal environmental impact, etc.
▲ 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: -20℃ to +70℃. In a low-temperature environment of -20℃, 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: IP65 to 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/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 can increase the self-sufficiency rate of energy, balance peak and valley loads, optimize electricity charges, and reduce the pressure on the power grid.
3. Maintenance cost:
▲ The long service life of equipment leads to cost dilution, and intelligent operation and maintenance reduces labor costs.

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 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