The difference between liquid cooling and air cooling in energy storage cooling systems

The energy storage industry has entered a stage of large-scale development, with energy storage technologies gradually maturing. Energy storage cooling technology is mainly divided into two types: liquid cooling and air cooling. Below is a detailed introduction to these two cooling technologies:

I. Air Cooling

The main equipment of the air cooling system in the energy storage system includes air conditioners, air ducts, and module fans. Fans are installed at the front of the module. Module fans dissipate heat from the core cells inside the module to the prefabricated cabin air duct, and the air conditioning system inside the prefabricated cabin dissipates heat through convection.

1. Characteristics of Air Cooling

Air cooling systems have a simple structure, light weight, effective ventilation in the presence of harmful gases, low manufacturing costs, easy installation, and maintenance. However, drawbacks include slower heat transfer coefficient between the battery wall and air, low heat dissipation efficiency, the need for larger heat dissipation channels, and unstable temperature uniformity. With advancements in energy storage technology, these issues with air cooling systems have gradually been addressed.

2. Application Scenarios of Air Cooling

Air cooling systems are suitable for various scales and types of energy storage systems, especially outdoors. It is currently the most widely used cooling technology and is applied in industrial refrigeration, communication base stations, data centers, temperature control scenarios, etc., with relatively high maturity and reliability. Especially in medium and low-power scenarios, air cooling remains mainstream.

II. Liquid Cooling

The liquid cooling system in the energy storage system involves installing honeycomb-shaped liquid cooling plates at the bottom of the battery compartment, which circulate coolant to remove heat generated during battery operation.

1. Characteristics of Liquid Cooling

Liquid cooling systems do not require large heat dissipation channels and occupy relatively small areas. They have strong heat dissipation capabilities, fast heat dissipation rates, stable temperature uniformity, and precise temperature management for each cell. However, the structure is slightly complex and compact, maintenance and upkeep costs are higher, and there is a risk of liquid leakage. Although the initial investment cost of liquid cooling systems is higher, their energy consumption is usually much lower than that of air cooling systems, and the overall lifecycle cost may be lower than that of air cooling systems.

2. Application Scenarios of Liquid Cooling

Liquid cooling systems are also suitable for various scales and types of energy storage systems, especially large-scale, high-energy density projects, where the advantages are particularly evident in scenarios with high battery pack energy density, fast charging and discharging speeds, and large environmental temperature variations.