NiMH battery packs

NiMH battery packs industry development and technical performance parameters

NiMH battery packs industry development and technical performance parameters. The composition and working principle of lead-acid batteries Lead-acid batteries are composed of positive plates, negative plates, separators, electrolytes, plastic tanks, etc. UPS lead-acid batteries are the world's largest battery products, and the processing volume accounts for 50% of the total battery volume. Today, lead-acid batteries have become a common "consumer product" in people's lives with the rapid development of the economy.

NiMH battery packs industry development

UPS batteries are mainly divided into four categories, including lead-acid batteries, lithium-ion batteries, nickel-hydrogen batteries, and nickel-cadmium batteries, according to different electrode materials and working principles. Among them, lead-acid batteries have the advantages of high cost performance, large capacity, high power, long life, safety and reliability. They are currently the world's largest and most widely used batteries; lithium-ion batteries also occupy a certain market share due to their high energy density.

The manufacturing process of UPS lead-acid batteries is relatively complicated. At present, the processing technology of maintenance-free lead-acid batteries in the industry is mainly divided into lead strip rolling, lead paste and preparation, grid production, lead paste filling, curing and drying, pole group casting welding and pole group slotting, through-wall welding, large cover heat sealing and terminal welding, battery acid addition and formation, small cover heat sealing and testing and offline processes.

Lead-acid batteries are the UPS batteries with the largest market share and the widest range of applications among chemical batteries, especially in the application areas of starting and large-scale energy storage. It will be difficult to be replaced by other new batteries for a long time. Lead-acid batteries are relatively low in price, with comparative advantages such as mature technology, excellent high and low temperature performance, stable and reliable, high safety, and good resource recycling, and the market competition advantages are obvious.

With the breakthrough of new technologies and the use of new structures, the continuous emergence of advanced lead-acid batteries such as lead-carbon batteries, bipolar batteries, and non-lead grid batteries has changed the shortcomings of low mass-energy ratio and short cycle life. In addition, with the gradual improvement of laws and regulations and the improvement of management level, the risk of lead pollution can also be prevented and controlled. It has injected new vitality into the continued development of the lead-acid battery industry. In the future, lead-acid batteries will continue to play an important role in backup power, energy storage, starting, power and other application areas.

Looking at the entire lead-acid UPS battery market, from the perspective of the number of competitors, the rate of growth, exit barriers, degree of homogeneity, and the level of competition, the lead-acid battery industry is in a mature stage, but the overall quality of the industry is uneven. Limited by the company's own factors, most companies focus on low-end products and fight price wars. At present, the existing companies in the market are in fierce competition.

In recent years, large and medium-sized lead-acid battery companies have successively introduced green ecological design to reduce pollutants from the source, improve resource utilization, and realize the ecological design of products. Many lead-acid battery companies have stepped up their technical transformation efforts, adopted more advanced and green process technologies, and improved the level of environmental protection and occupational health protection. At the same time, the introduction of automated and intelligent equipment has achieved energy conservation and emission reduction in the manufacturing process. Some large lead-acid battery companies have also carried out waste battery recycling, embarking on the road of green circulation and ecological civilization development.

NiMH battery packs technical performance parameters

1. Capacity

UPS battery capacity refers to the amount of electricity stored in a lead-acid battery, represented by the symbol C. The commonly used unit is ampere-hour, referred to as ampere-hour (Ah) or milliampere-hour.

2. Energy

The energy of a NiMH battery packs refers to the electrical energy that the battery can provide under a certain discharge system, usually expressed in watt-hours (Wh). The energy of a UPS battery is divided into theoretical energy and actual energy. The specific energy of a battery is a comprehensive indicator, which reflects the quality level of the battery and also indicates the technical and management level of the manufacturer.

3. Cycle life

The battery undergoes a charge and discharge, which is called a cycle. Under certain discharge conditions, the number of cycles that the battery can withstand before it works to a certain capacity specified value is called the cycle life.

4. Storage performance

During the storage period of UPS lead-acid batteries, due to the presence of impurities in the battery, such as positively charged metal ions, these impurities can form micro-batteries with the negative electrode active material, resulting in the dissolution of negative electrode metal and the precipitation of hydrogen.

5. Internal resistance

Battery internal resistance includes ohmic internal resistance and polarization internal resistance, and polarization internal resistance includes electrochemical polarization and concentration polarization. The existence of internal resistance makes the terminal voltage of the battery lower than the battery electromotive force and open circuit voltage during discharge, and higher than the electromotive force and open circuit voltage during charging.

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