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How should lithium batteries that have not been used for a long time be stored

Storage temperature -40% charged state -------100% charged state

2025-09-29

Graphene puts a fireproof coat on energy storage lithium batteries

Graphene dresses energy storage lithium batteries in a "fireproof coat", reducing the explosion coefficient of electric vehicles

2025-09-29

Conduct a thorough analysis of the impact of temperature on lithium iron phosphate batteries

Lithium-ion batteries have numerous advantages, such as high working voltage (three times that of nickel-metal-hydride and nickel-cadmium batteries), large specific energy (up to 165Wh/kg, three times that of nickel-metal-hydride batteries), small size, light weight, long cycle life, low self-discharge, no memory effect, and no pollution. Lithium iron phosphate batteries are highly favored in the new energy industry. With a cycle life of around 3,000 times and stable discharge, they are widely used in power batteries and energy storage fields.

2025-09-29

The wide application of lithium-ion batteries in various fields

It is well known that new market demands for lithium-ion batteries are taking shape very rapidly. Lithium-ion batteries are currently divided into three major categories. The first is consumer electronic products. Nowadays, lithium-ion batteries are widely used in mobile devices such as smartphones and laptops. The market capacity of this market can basically be calculated in the hundreds of billions. The second is the emerging demand for electric vehicles. Whether it is pure electric vehicles or plug-in hybrid vehicles, the current demand has gradually taken shape. Thirdly, lithium batteries will be used in the field of energy storage in the future. Its market capacity will be even broader than that of electric vehicles, and its market can even be measured by a value of trillions.

2025-09-29

The composition of the positive and negative electrodes of lithium batteries

Lithium batteries usually come in two shapes: cylindrical and square. The interior of the battery adopts a spiral winding structure, with a very fine and highly permeable polyethylene film isolation material separated between the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobalt oxide (or lithium nickel cobalt manganese oxide, lithium manganate, lithium iron phosphate, etc.) and aluminum foil. The negative electrode is composed of a current collector made of graphitized carbon material and copper foil. The battery is filled with organic electrolyte solution. In addition, it is equipped with safety valves and PTC components (some cylindrical types are used) to protect the battery from damage in case of abnormal conditions or output short circuits. The voltage of a single lithium battery is 3.7V (3.2V for lithium iron phosphate cathode), and the battery capacity cannot be infinitely large. Therefore, single lithium batteries are often connected in series or parallel. To meet the requirements of different occasions.

2025-09-29

What is the charging and discharging process of lithium batteries like

The cathode material of a battery accounts for 30% to 40% of the cost of a lithium battery.

2025-09-29

What is the appropriate charging current for lithium batteries

The current during constant current charging: Constant current means that the current remains constant while the voltage gradually increases, and at this point, it enters the fast charging stage. Most constant current charging currents are set between 0.4 and 0.6C, which can be understood as 0.5C. That is to say, without considering other factors, it can be fully charged in about two hours. The reason for choosing 0.5C is that this current strikes a good balance between charging time and charging safety.

2025-09-29

Misunderstandings about lithium battery discharge

"The more a lithium battery is discharged, the greater the battery's wear and tear will be," said Tom Hartley, an electrical engineering professor at Eyron University who helps NASA research on extending battery life. "The more fully a battery is charged, the greater the battery's wear and tear will be." It is best for lithium batteries to be in an intermediate state of charge; otherwise, their lifespan will be longer."

2025-09-29

Why does the capacity of lithium batteries decrease in winter

锂离子电池自从进入市场以来，以其寿命长、比容量大、无记忆效应等优点，获得了广泛的应用。锂离子电池低温使用存在容量低、衰减严重、循环倍率性能差、析锂现象明显、脱嵌锂不平衡等问题。然而，随着应用领域不断拓展，锂离子电池的低温性能低劣带来的制约愈加明显。

2025-09-29

The differences between batteries and lead-acid storage batteries

At present, the energy density of lithium batteries is 200-260h/g, while that of lead-acid batteries is 50-70h/g. Therefore, the weight energy density of lithium batteries is 3 to 5 times that of lead-acid batteries. This means that under the same capacity, lead-acid batteries are 3 to 5 times that of lithium batteries. Thus, lithium batteries have a significant advantage in energy storage technology.

2025-09-29

The 30MW photovoltaic project in Tianjin verifies the advantages of N-type modules

In the 30MW photovoltaic power station built by Guodian Power in Jizhou District, Tianjin, we conducted a comparative study on the power generation performance of bifacial photovoltaic modules equipped with TOPCon and PERC cell technologies. The project site, Jizhou District, belongs to the warm temperate semi-humid continental monsoon climate. It has distinct four seasons, abundant sunshine, and rich heat. The summer is hot and rainy, while the winter is cold. The annual total solar irradiance reaches 1,450 to 1,600 KWH /m2(5,220 to 5,760 MJ/m2). The light resource conditions are excellent, which is conducive to the development and construction of photovoltaic projects.

2025-09-18

Notice of the National Energy Administration on Issuing the "Guiding Opinions on Energy Work in 2023

To thoroughly implement the relevant decisions and plans of the Central Committee of the Communist Party of China and The State Council, and to solidly carry out energy work in 2023 and continuously promote high-quality energy development, the National Energy Administration has formulated the "Guiding Opinions on Energy Work in 2023", which is hereby released. All localities and units are requested to implement it in light of their actual conditions and inform our bureau of the implementation status by the end of December 2023.

2025-09-18