LiFePO4-batteries from China: advantages, applications and features of procurement

The transition to energy storage has become one of the notable trends of recent years. Batteries are used not only in electronics and electric vehicles, but also in solar power plants, backup power systems, industry and private homes.

One of the most popular technologies has become LiFePO4 batteries Lithium-iron-phosphate batteries. They have a long service life, good stability and high safety compared to a number of other lithium technologies.

China today is one of the world’s main centers for the production of LiFePO4 cells and finished battery systems. Both individual cells and finished batteries for homes, businesses, electric vehicles and energy storage systems are on the market.

We will discuss where LiFePO4 batteries are used, how they differ from other batteries and what to consider when buying from China.

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What are LiFePO4 batteries?

LiFePO4 is a type of lithium-ion battery that uses lithium-iron-phosphate as a cathode material.

The technology has become widespread due to a combination of:

• long service life;
• stability;
• relatively high security;
• good efficiency;
• resistance to a large number of charge and discharge cycles.

Unlike some other lithium technologies, LiFePO4 is well suited for systems where the battery is charged and discharged daily.

Why LiFePO4 is becoming more popular

The main advantage of technology is resource.

When properly operated, high-quality LiFePO4 batteries can withstand thousands of charge and discharge cycles. The specific resource depends on the manufacturer, operating mode, temperature and depth of discharge.

Also important:

• stable voltage;
• low self-discharge;
• high efficiency;
• No need for regular maintenance;
• The ability to create high capacity battery systems.

That’s why LiFePO4 is widely used where the battery should last for years.

Where LiFePO4 batteries are used

Today, technology is used in a variety of areas.

Energy storage systems

One of the main applications.

Batteries are used to store electricity from:

• solar panels;
• wind turbines;
• power grids;
• generators.

The stored energy is then used at the right time.

Standby meals

LiFePO4 is used for:

• private homes;
• server;
• telecommunications equipment;
• security systems;
• shops and offices;
• industrial equipment.

In case of disconnection of the network, the battery automatically provides power to the connected devices.

Solar power plants

LiFePO4 is well suited for autonomous and hybrid solar systems.

During the day, energy accumulates, and in the evening or at night it is used to power the load.

Electric transport

The technology is used in some electric vehicles, electric buses, forklifts, electric bikes and other machinery.

Industry

Battery systems are used in:

• warehouse equipment;
• Autonomous power systems;
• telecommunications;
• monitoring equipment;
• mobile power plants.

Main formats of LiFePO4 batteries

Chinese manufacturers offer several product options.

Separate battery cells

They are used by manufacturers who build battery systems themselves.

Cylindrical, prismatic or other types of elements can be purchased.

The advantage is the ability to independently choose the configuration.

Finished batteries

The manufacturer already combines the cells into a single system.

The kit usually includes:

• body;
• BMS?
• protection system;
• connectors;
• display or control interface.

This is more convenient for the end user.

Home energy storage systems

Ready-made large-capacity batteries designed to work with inverters.

Such systems can be used as a backup power source or as part of a solar power plant.

What is BMS and why is it needed?

BMS - Battery Management SystemThe battery control system.

This is one of the most important components of the battery.

BMS monitors the condition of the cells and can protect the battery from:

• recharging;
• deep discharge;
• overheating
• too much current;
• short circuit.

When choosing LiFePO4, you can not evaluate the battery only by capacity.

Two batteries of the same capacity can differ significantly in the quality of BMS, cells and cooling systems.

What characteristics to look at

When choosing a battery, it is necessary to consider:

• nominal voltage;
• capacity;
• maximum charge current;
• maximum discharge current;
• the permissible depth of discharge;
• number of cycles;
• operating temperature;
• type of BMS;
• hull protection class;
• possibility of parallel connection;
• Compatibility with the inverter.

Particular attention should be paid to the temperature.

LiFePO4 works well in a wide range of environments. Low temperature charging requires special solutions. Operating in cold climates may require a battery heating system.

Why China has become a major manufacturing center

China occupies a key place in the global chain of production of lithium batteries.

The country has large manufacturers of cells, materials, BMS, inverters and finished energy storage systems.

This creates an important advantage: almost all components can be found in a single production ecosystem.

Chinese companies offer:

• individual cells;
• finished batteries;
• industrial storage systems;
• home storage devices;
• BMS?
• inverters;
• chargers.

In addition, many factories are working on OEM/ODM modelsallowing to produce batteries under the brand of the customer.

Why you can not choose a battery only by capacity

“LiFePO4 100 Ah” doesn’t say anything about battery quality.

It is necessary to clarify:

• which cells are used;
• a new battery or a rebuilt one;
• actual capacity;
• cell manufacturer;
• cell class;
• characteristics of BMS;
• allowable current;
• resource;
• test results.

Particular attention should be paid to too cheap offers.

The difference in price can be explained not only by the manufacturer's margin, but also by the quality of the elements themselves.

How to choose a supplier from China

Before ordering, it is advisable to check:

Cell manufacturer.

Find out what elements are used inside the battery.

Own production.

Not every company that sells batteries makes them.

BMS.

Clarify the manufacturer, model and capabilities of the control system.

Testing.

Ask for the results of the test capacity and characteristics.

Guarantee.

It is important to understand who and how will fulfill the guarantee obligations.

Certification.

A set of documents may be required for international transport and use in a particular market.

Features of delivery of LiFePO4 from China

Lithium batteries refer to goods whose transportation requires compliance with special rules.

When organizing delivery, it is necessary to determine in advance:

• mode of transport;
• claims of the carrier;
• packaging;
• marking;
• necessary documents;
• requirements for dangerous goods;
• insurance.

You can’t expect batteries to be shipped in the same way as standard industrial equipment.

It is especially important to coordinate logistics with the carrier in advance, since the requirements depend on the characteristics of the battery, the mode of transportation and the specific route.

What mistakes buyers make

Buying the cheapest battery

A low price may mean using less quality cells or components.

Do not check the real characteristics

The declared capacity does not always correspond to the actual.

Not counting BMS.

Even quality cells require a well-chosen control system.

Not checking compatibility

The battery must match the inverter, charging equipment and the entire power system.

Do not take into account the operating temperature

This is especially important for cold regions.

Don't think about service.

Before buying, you need to understand where the battery will be diagnosed and repaired after the warranty ends.

LiFePO4 or other lithium technologies?

LiFePO4 is not a universal solution for all tasks.

The main advantage of this technology is the combination of resource, stability and security.

Therefore, it is particularly interesting for:

• stationary storage devices;
• solar power plants;
• backup power;
• industrial equipment;
• equipment operating with regular cycles of charge and discharge.

Other applications may use batteries with different chemistry if the priority is, for example, maximum energy intensity or minimum mass.

The choice of technology should be based on a specific operation scenario.

Market prospects

Demand for energy storage systems continues to grow amid the development of solar energy, electrification of transport and the need for backup power.

For business, this opens up several directions:

• import of finished batteries;
• assembly of battery systems;
• production under its own brand;
• supply of storage devices for solar power plants;
• Maintenance and modernization of existing systems.

Chinese manufacturers continue to expand the range of equipment and integrate batteries with inverters and control systems.

Outcomes

LiFePO4 batteries have become one of the most popular energy storage solutions due to the combination of long life, stability and relatively high safety.

China offers a wide range of products, from individual cells to complete energy storage systems.

However, when purchasing, you can not focus only on the capacity and price.

It is important to check cells, BMS, real characteristics, temperature, compatibility with equipment, documents and terms of service support.

A well-chosen LiFePO4 system can operate for years as part of a solar power plant, backup power supply or industrial equipment.

And when buying from China, the main factor of saving is not the lowest price, but the most expensive. The right choice of manufacturer and battery configuration.