Over the years, as an important part of the power system, substation operation and maintenance involved in all aspects of its operation and maintenance of the important and important responsibility is self-evident. However, in the daily operation and maintenance process, operation and maintenance personnel by the data statistics found in recent years, valve-regulated lead-acid battery (hereinafter referred to as "battery") life is difficult to achieve design life, such as battery design life of 10 ~ 12 Year, and most of the actual battery life is only 6 to 8 years.

In recent years, substation operation and maintenance personnel try to use innovative technical means, by replenishing Honghuai lead-acid battery repair solution decomposition sulfate sulfate lead crystal, repair regeneration success rate of more than 95%, not only improve the efficiency of resource use, The generation of pollution, to achieve the recycling of waste lead-acid batteries.

Challenge: The battery replacement cycle to shorten the economic losses and environmental pollution

"As the battery with high security, low cost, the advantages of mature production technology, so a very long period of time, the substation is still using 110-volt, 220-volt lead-acid battery as power scheduling, control of backup power." According to the South Guangzhou Power Supply Bureau in the substation DC system technology research work Zhou Zhe introduced into the grid using the battery, the use of 3 to 5 years, its capacity has been lower than the national requirements of not less than 80% of the nominal capacity requirements.

At the same time, the current battery management strategy for the battery maintenance personnel are also facing enormous pressure: on the one hand, the battery does not reach the design life, can not easily replace the new battery; Second, even if the replacement of new batteries, the approval process is quite long, Approval for the battery during the sick work, a serious impact on the safety of DC systems, but also affect the reliable operation of the grid.

"In the process, due to electrolyte evaporation, cathode vulcanization, positive grid softening, thermal runaway, diaphragm failure, self-discharge and other reasons leading to battery failure in advance, greatly shorten the life." Zhou Zhe said that due to battery failure in advance, Replacement cycle shortened, resulting in a huge economic losses. At the same time, lead-acid batteries lead plate content of more than 70%, sulfuric acid and suspended lead compounds accounted for about 20% of hazardous solid waste, contrary to the concept of environmental protection.

Thus, if these batteries can repair and regeneration, can reduce the destruction of waste batteries on the environment, but also save a lot of natural resources and energy, and can bring huge economic benefits for the enterprise. Therefore, the battery repair and regeneration technology has a very important economic and social significance.

Innovation: added repair liquid decomposition of lead sulfate crystal battery capacity recovery of more than 95%

However, the battery repair regeneration is not an easy task. "Common market pulse repair method, multi-spectral resonance repair and other methods are used, the capacity of battery repair capacity is very limited, the longest one used only 2 months." Zhou Zhe recalled in 2014, a new Battery regeneration repair technology to change his understanding. He introduced the technology by adding Wang Huai lead-acid battery repair solution can be decomposed sulfation of lead sulfate crystals.

The decomposition of lead sulfate crystals, is the decomposition of metal lead, lead dioxide two active substances, so that these substances back into the battery chemical reaction substances. This will reduce the internal resistance of the battery, and can effectively prevent the formation of the crystal again, to achieve battery repair regeneration. Compared with the traditional pulse repair, Wang Huai lead-acid battery repair fluid repair technology greatly reduces the damage to the battery body.

"Sulfation of the battery is inevitable, but after that, as long as its physical structure does not occur serious damage changes, the battery can be repaired." Zhou Zhe explained that for the repair of lead-acid batteries, Huai lead-acid battery repair fluid, the use of intelligent repair equipment to impose safety voltage on the battery, repair liquid from the catalytic role in promoting the original insoluble lead sulfate crystal decomposition and reduction of lead and lead dioxide active substance back to the electrolyte , So as to clear the gap between the negative plate to promote the electrolyte and the plate active material full contact reaction, the purpose of recovering lead-acid battery capacity.

After the test, the use of repair fluid activation repair, the battery capacity are basically restored to the nominal capacity of 95% or more, or even up to 100%, while the battery internal resistance is also restored to the factory level. Service life, the high-temperature aging test identification, with the repair technology after the repair of the battery up to 3 years.

According to Zhou Zhe introduced by adding the Huai-hu lead-acid battery repair fluid non-corrosive, no impact on the internal battery will not cause the battery open circuit, security significantly. At present, the first group of Guangzhou Power Supply Bureau after the repair of the battery has been re-put into use in the substation in September last year, has been up to 14 months, running in good condition.

It is reported that the battery renewable repair work also in Shenzhen Power Supply Bureau to carry out. Earlier this year, the battery repair and regeneration research in the formal project, has been restored battery 7 group, the capacity returned to the rated capacity of 95% or more, has been put into substation operation. The Bureau in the substation DC system technology research work Ji Zhefu calculations, the Shenzhen Power Supply Bureau substation is currently in the transportation battery about 480 groups, if the life of 8 years to count, one year down the average have to replace 60 batteries, but If the battery is available through scientific repair 12 years, then the average annual replacement of only 40 groups of batteries for the annual cost savings of about 1.8 million enterprises.

Prospect: strengthen the whole life cycle management to achieve secondary use of scrap batteries

Wang Huai lead-acid battery repair technology not only solve the substation operation and maintenance personnel in the battery maintenance of the big problems, but also for the battery life cycle management provides a scientific means.

In the power industry, the existing domestic and foreign low voltage and secondary equipment and other assets of the lower value of equipment in the whole life cycle cost less, more emphasis on asset value is relatively high high-pressure primary equipment. In fact, the annual depreciation cost of the storage battery in the substation DC system is not low, and the existing management strategy is not perfect, so it is urgent to study the whole life cycle cost of the substation DC system, to establish the operation and maintenance of the storage battery of the substation. Use and retire the whole process of retirement management of the best programs, thereby enhancing the comprehensive economic efficiency of enterprises.

To this end, Ji-Fu and team members, hundreds of cells on the test, analysis of data obtained, the most cost-effective mode of operation is the battery capacity down to 70% after the use of repair liquid to its second light Degree of repair.

"Lead-acid batteries in the power system prematurely scrapped, with the scientific repair of lead-acid battery repair technology, you can drastically applied to photovoltaic power generation, energy storage, energy storage station, in order to achieve the scrap lead-acid battery of two Reduce the use of lead-acid batteries, reduce the pollution of these batteries on the environment. "Ji-fu that the development of energy storage can alleviate the peak no electricity available, low-peak electricity, no one with the problem, greatly Enhance the value of the power system, more convenient for enterprises, household electricity, the development of the power grid is of great significance.