High-capacity home energy storage battery-Shenzhen Golden Future Energy Ltd.,

High-capacity home energy storage battery

Time：2025-10-28 Views：1

　　I. Core Features and Capacity Adaptation Design (Different from Conventional Capacity Models)

　　1. Key Technical Enhancements

　　Large Cell Core Architecture: Utilizing large-capacity lithium iron phosphate cells of 300Ah and above (mainstream models are 314Ah and 587Ah, with high-end models reaching 690Ah), this reduces system complexity by reducing the number of integrated cells. For example, a 560Ah cell reduces the number of cells by 50% and the number of components by 47% compared to a traditional 280Ah cell, improving system integration efficiency by 30%. With a volumetric energy density of 380Wh/L to 440Wh/L, a 15kWh system requires only two to three battery packs, making it suitable for limited installation space in homes. Optimized Capacity and Lifespan: The system covers capacities from 15kWh to 50kWh, supports parallel expansion of multiple modules (maximum 10kWh per module), and boasts a cycle life exceeding 10,000 cycles (80% capacity retention). Lanjun 314Ah cells exhibit a first-year degradation of ≤3%, and discharge capacity retention exceeds 90% at -30°C. The BMS features external active balancing technology, enabling non-stop balancing and reducing after-sales maintenance hours by 90%.

　　High-Power Charge and Discharge Compatibility: Supports 0.5C-1C fast charging (e.g., a 20kWh battery can be fully charged in 1-2 hours), with a discharge power range of 5kW-30kW, making it suitable for high-power loads such as home electric vehicle AC charging stations (7kW-11kW) and central air conditioners. Select models are compatible with direct DC charging from photovoltaic power plants, offering a wide input voltage range of 200V-1000V DC and a capacity-to-charge ratio of up to 2.5, matching photovoltaic installations exceeding 15kWp. Safety structural innovation: Ultra-low thermal conductivity insulation pads are used to meet the thermal runaway protection requirements of GB/T 36276-2023. The battery pack is equipped with a three-way shut-off valve liquid cooling system, allowing for direct disassembly for maintenance without draining the fluid, reducing handling time by 60%. The BMS features both functional safety and cybersecurity protection, achieving a system safety rating of SIL2.

　　2. Typical Application Scenarios

　　High-power consumption households (including daily electric vehicle charging, multiple air conditioners/ovens running simultaneously, with an average daily power consumption of 50kWh or more);

　　Rooftops with large photovoltaic installations (over 10kWp, requiring multi-day surplus power storage to cope with continuous rainy days);

　　Areas with high power outage frequency and the need for long-term backup power (such as remote areas requiring 3-7 days of basic power supply);

　　Commercial and industrial households with significant peak-offset price differences (such as shops and small workshops, using large-capacity arbitrage to reduce electricity costs). II. Troubleshooting for High-Capacity Models (Additional Troubleshooting for Standard Capacity Models)

　　1. Cell Consistency Imbalance (High-Frequency Fault for High-Capacity Models)

　　Possible Causes: Large-capacity battery packs consist of dozens of cells connected in series (e.g., a 587Ah pack contains 24-32 cells). After long-term charge and discharge, the individual cell capacity decay varies widely (voltage difference > 50mV); a faulty active balancing module causes partial cell overcharge; and transport vibration causes poor soldering of the cell tabs. Troubleshooting and Solution:

　　Check the cell voltage curve using the BMS backend. If the voltage difference exceeds 80mV after three consecutive charge and discharge cycles, activate the active balancing function (some models support remote triggering via the app). The balancing process should last 8-12 hours.

　　Check the balancing module: Disconnect the battery main switch and use a multimeter to measure the output current of the balancing module (should be between 50mA and 200mA). If the current is zero, replace the module (matching the cell capacity, such as a 587Ah dedicated balancing board).

　　Disassemble and inspect the cells: If balancing is ineffective, disassemble the battery pack and measure the cell capacity (using a dedicated capacity tester). Replace cells that have degraded by more than 20%. Replace the new cells with cells from the same batch (avoid mixing 314Ah/587Ah cells from different manufacturers). 2. Liquid Cooling System Failure (Core Issue for Large-Capacity Heat Dissipation)

　　Possible Causes: Blockage in the liquid cooling pipes (accumulation of coolant impurities); aging of the circulation pump resulting in insufficient flow; failure of the three-way shut-off valve seal, causing leakage and impacting heat dissipation efficiency (large-capacity batteries generate over 200W of heat during charge and discharge).

　　Troubleshooting and Resolution:

　　Check BMS temperature data: If the cell temperature difference is greater than 8°C or the battery pack temperature exceeds 45°C, immediately shut down the machine and inspect the liquid cooling system. Open the vent valve to release air from the pipes and use a pressure gauge to check the pipe pressure (normally 0.3-0.5 MPa).

　　Cleaning and Component Replacement: If pressure is insufficient, disassemble the circulation pump and replace the impeller (use an engineering plastic impeller that can withstand temperatures exceeding 100°C). If the pipes are clogged, backflush the pipes with a specialized cleaning agent (such as an ethylene glycol-based cleaner).

　　Seal Repair: If the shut-off valve is leaking, replace the valve core seal (must be made of fluororubber, resistant to coolant corrosion). When reinstalling, apply specialized sealant to ensure leak-free joints. 3. Frequently Triggered Charging Current Limit

　　Possible Causes: PV input power far exceeds the rated battery charging power (e.g., a 50kWh battery has a rated charging power of 10kW, while the instantaneous PV output reaches 15kW); the BMS charging protection threshold is set too low; or the battery cell temperature is too low (<0°C), resulting in reduced charging acceptance.

　　Troubleshooting and Solutions:

　　Limit input power: Set a PV charging power cap on the inverter (no more than 1.2 times the battery rating), or enable "peak shaving" mode to automatically adjust the input.

　　Calibrate BMS parameters: Contact the manufacturer to remotely adjust the charging voltage threshold (e.g., from 3.65V/cell to 3.68V/cell, in accordance with the battery cell specifications). Also, check the temperature sensor (if the displayed deviation exceeds 3°C, replace it).

　　Low-Temperature Preheat: In environments below 0°C, enable the battery preheat function (configure it via the app to preheat to above 5°C before resuming charging). If the preheat function is not available, install an external heater (power ≤ 500W to prevent local overheating). III. Targeted Maintenance and Safety Guidelines

　　1. Regular Maintenance Priorities (More Stringent for Standard Capacity Models)

　　Battery Cell and Balancing System Maintenance: Check the cell voltage balance monthly via the BMS. Manually trigger deep balancing quarterly (float charge for 4 hours after charging to 100%). Test the cell internal resistance annually (using an internal resistance tester; an increase of ≤20% compared to the initial value is considered normal). For ultra-large capacity cells such as 587Ah, perform capacity sampling tests every six months.

　　Liquid Cooling System Specific Maintenance: Replace the coolant every six months (use antifreeze with an insulation rating of ≥50kV/mm and a freezing point of ≤-35°C), and clean the filter. Disassemble and inspect the circulation pump and shut-off valve every 12 months, replace any aging components, and record the line pressure curve. Electrical Connection Inspection: Tighten the battery pack's main terminals every two months (torque value based on cable specifications; 25-30 N·m for 16mm² cables). Use an infrared thermometer to check terminal temperature (≤60°C during charging and discharging). Check the grounding system monthly to ensure ground resistance is ≤2Ω (4Ω for standard capacity models).

　　2. Safety Operation and Compliance Guidelines

　　Installation Specifications: Must be performed by personnel with "Large-Capacity Energy Storage System Installation Qualifications." Pre-installation load-bearing tests must be conducted (a 15kWh battery pack weighs approximately 150kg, and the mounting surface must have a load-bearing capacity of ≥300kg/m²). Keep away from water sources and gas pipelines, and ensure spacing between battery packs is ≥30cm (15cm for standard models). Strictly adhere to GB/T 40278-2021. After installation, capacity registration and safety inspections must be completed by the power department. Emergency Response Guidelines: If a thermal runaway alarm occurs (BMS emitting audible and visual warnings), immediately disconnect all power supplies, activate fire alarms (such as smoke alarms and fire extinguishers), evacuate 50 meters away, and sound the alarm. In the event of a liquid cooling system leak, wear insulated, acid-resistant gloves and use absorbent cotton to absorb the coolant. Do not use metal tools to clean the system (to prevent short circuits).

　　Scrap and Replacement Requirements: Batteries exceeding 12 years or reaching 10,000 cycles (capacity less than 80% of rated value) must be scrapped and recycled by a qualified hazardous waste disposal company (cell model and capacity certification must be provided). Replacement battery packs must be of the same brand and capacity (e.g., a 587Ah battery cannot be replaced with a 314Ah battery). After replacement, re-test the battery with a charge-discharge cycle (capacity deviation ≤3% over three consecutive cycles). IV. Core Differences from Conventional Capacity/Solar-Compatible Models

　　Dimensions

　　Conventional Capacity Model (≤10kWh)

　　Solar-Compatible Model (10-15kWh)

　　High Capacity Model (≥15kWh)

　　Cell Specifications

　　Under 280Ah, no active balancing

　　Around 300Ah, basic balancing

　　314Ah-690Ah, external active balancing

　　Cycle Life

　　3000-5000 cycles

　　5000-8000 cycles

　　10000-15000 cycles