Key Carrier of the ESS

As the key carrier of the energy storage system, the energy storage container box must meet the requirements of safety, environmental adaptability and functional integration. The following is a detailed description of its classification, design points and composition:

1. Classification of energy storage containers

2. 1. By application scenario

Grid-level energy storage: large capacity (MWh level), enhanced heat dissipation and grid interface design.

Industrial and commercial energy storage: modular design, adaptable to peak and valley electricity price management.

Household/portable energy storage: small and lightweight, emphasizing mobility and convenience.

Lithium-ion battery container: the mainstream choice, requires integrated BMS and thermal runaway protection.

Liquid flow battery container: electrolyte circulation pipeline and anti-corrosion structure need to be designed.

Sodium-sulfur battery container: operates at high temperature (300°C), requiring insulation and molten sulfur protection.

Single energy storage type: only contains battery system and has a simple structure.

Photovoltaic storage integrated type: integrated photovoltaic inverter and MPPT controller.

Hybrid energy type: compatible with multiple energy inputs such as wind power and diesel generators.

• Core elements of design

1. Structural design

Material:

Frame: high-strength steel (such as Q355B) or aluminum alloy (lightweight scenario).

Siding: Double steel plate sandwiched with fireproof rock wool (fireproof IP54) or FRP composite material (corrosion resistant).

Size: Standard 20/40ft container, or customized non-standard size

2. Thermal management design

Air cooling: used for lithium iron phosphate batteries with low temperature rise requirements.

Liquid cooling: precise temperature control (±2°C), suitable for high energy density ternary batteries.

Phase Change Material (PCM): Assists heat dissipation and is used for local hot spot management.

3. Security by design

Fire prevention: V0 flame retardant material, full flooding heptafluoropropane fire extinguishing system.

Explosion-proof: explosion relief valve design (pressure relief threshold 10-15kPa), combustible gas monitoring (such as H₂, CO).

Insulation: IP65 protection grade, insulation monitoring device (1000V system insulation resistance ≥ 1MΩ).

4. Environmental adaptability

Temperature: -30°C~55°C wide operating temperature range, optional heating film/air conditioning preheating.

Earthquake resistance: meets IEC 61400-2 standard (8-level earthquake intensity).

Anti-corrosion: C5-M grade anti-corrosion coating (salt spray test ≥ 2000 hours).

5. Intelligent design

Remote monitoring: Integrated IoT module (4G/5G) to upload SOC, temperature and other data in real time.

Predictive maintenance: AI algorithms analyze battery degradation trends.

• Typical components

Module	key parts	Function description
Battery system	Battery module, BMS, current sensor	Energy storage and state management (SOC/SOH estimation)
PCS	Bidirectional converter, grid-connected switch	DC/AC conversion, supports constant power/constant current mode
Thermal management system	Air conditioning unit, liquid cooling plate, pipeline	Maintain the battery operating in the optimal temperature range (25±5℃)
Fire protection system	Smoke detectors, fire extinguisher tanks, sprinklers	Early warning + multi-stage fire extinguishing
Power distribution unit	Circuit breakers, contactors, lightning arresters	Overcurrent/short circuit protection, surge protection
Auxiliary system	Lighting, access control, video surveillance	Operation and maintenance safety and convenience