Views: 0 Author: Site Editor Publish Time: 2026-04-16 Origin: Site
In the energy storage system of a photovoltaic power station, the battery pack, as the core energy storage unit, undertakes the key functions of electrical energy storage, supply-demand regulation and emergency power supply. Its operating status directly determines the power supply stability, reliability and overall service life of the photovoltaic power station. Due to the complex operating environment of photovoltaic power stations, the battery pack is in a state of charge-discharge cycle for a long time, and is easily affected by various factors such as temperature, humidity, charging method and installation specifications, resulting in performance degradation, failure and damage. Therefore, establishing a scientific and systematic maintenance and management system and implementing standardized maintenance measures are the core prerequisites for ensuring the efficient, safe and long-term operation of the battery pack. Combining the operating characteristics of battery packs in photovoltaic power stations and industry operation and maintenance standards, this article details the key maintenance and management measures and operational specifications, providing technical reference for the operation and maintenance of photovoltaic power stations.
The operating environment and installation quality of the battery pack are the foundation for its stable work. Good environmental conditions and standardized installation processes can effectively reduce the failure rate and extend the service life.
Temperature control is the primary link in the maintenance of the battery pack. According to the operation requirements of the battery in the photovoltaic power station, the temperature in the battery room should be kept in a suitable range of 10~30℃ all year round. This temperature range can effectively ensure the stable progress of the chemical reactions inside the battery, avoid accelerating the loss of internal electrolyte and shortening the battery life due to high temperature, or reducing the battery capacity and causing freezing damage due to low temperature. At the same time, the room should maintain good ventilation and sufficient lighting. Ventilation can timely discharge harmful gases such as hydrogen generated during the battery charging process to prevent gas accumulation from causing safety hazards, and lighting provides convenience for daily inspection. For areas without heating equipment where the minimum temperature is close to zero degrees Celsius, the battery room should be built as a passive solar house to achieve indoor heat preservation and anti-freezing using solar energy, or other effective heat preservation measures such as adding insulation layers and heating equipment should be taken to ensure the normal operation of the battery in low-temperature environments.
Installation specifications are another key to ensuring the safe operation of the battery pack. The battery pack must be installed in strict accordance with the design drawings. The installation platform or bracket should be made of acid-resistant materials or coated with acid-resistant coating on the surface to prevent the bracket from being corroded after the battery electrolyte leaks. At the same time, complete insulation facilities should be equipped to avoid leakage, short circuit and other faults. The installation spacing must strictly follow the specification requirements: the distance between the battery and the wall is not less than 30cm, which is convenient for ventilation, heat dissipation and inspection operations; the spacing between platforms or brackets should be reasonably determined according to the external dimensions of the battery, generally not less than 80cm, to ensure sufficient operating space and avoid mutual influence between batteries. In addition, during the installation process, it is necessary to ensure that the battery polarity is correctly connected to avoid battery damage or safety accidents caused by reverse connection of positive and negative electrodes.
The maintenance of the battery pack in the photovoltaic power station should follow the dual mode of "daily inspection + regular inspection", and potential faults should be found and handled in a timely manner through regular monitoring to prevent the expansion of faults.
Daily inspection is the responsibility of the on-duty personnel, with a frequency of once a day or per shift, focusing on checking the basic hidden dangers affecting the operation of the battery pack. The inspection items mainly include: first, environmental status inspection, confirming whether the indoor temperature, ventilation and lighting meet the requirements, and whether the room is kept clean without debris accumulation and corrosive substances; second, equipment appearance inspection, checking whether the battery case and cover are intact, and whether there are damages, cracks, leakage and other phenomena; third, connection status inspection, verifying whether the connection between the busbar and the plate is firm, and whether there are corrosion, looseness, heating and other conditions at the connection; fourth, operating parameter inspection, confirming whether the charging current is in an appropriate range to avoid overcurrent charging; fifth, auxiliary facility inspection, ensuring that various maintenance tools and monitoring instruments are intact and available and in normal status. Detailed records should be made during the inspection, minor hidden dangers found should be handled in a timely manner, and major hidden dangers should be reported immediately and relevant operation should be suspended.
Regular inspection is the responsibility of the special person in charge of the battery, with a frequency of once a month. The inspection content is more detailed and comprehensive, focusing on equipment cleaning and status detection. Specifically, it includes: thoroughly cleaning the surface of the battery and the surrounding environment, removing dust and debris to avoid dust accumulation affecting heat dissipation or causing poor insulation; carefully checking the integrity of the plates and poles, checking whether the poles are corroded or deformed, and whether the plates are sulfided or fallen off; detecting the insulation performance of the battery pack to ensure that the insulation meets the standard and avoid leakage risks. All inspection results should be detailed in the battery operation record book, and a complete equipment operation file should be established to facilitate subsequent traceability, analysis of equipment operation trends and provide a basis for the optimization of maintenance strategies. At the same time, the accuracy of relevant monitoring instruments can be calibrated quarterly in accordance with industry standards to ensure the accuracy of operating parameter monitoring.
During the operation and maintenance of the battery pack, flammable and explosive gases such as hydrogen are easily generated, and the electrolyte is corrosive. Therefore, it is necessary to strictly implement safety management measures, standardize the operation process, and prevent safety accidents.
Fire prevention and explosion-proof regulations must be strictly implemented in the battery room. Ignition and smoking are strictly prohibited, and any devices that may generate electric sparks are prohibited to be installed to prevent igniting the hydrogen accumulated in the room. Warning signs such as "No Open Flame" and "No Smoking" should be clearly posted on the door of the battery room to remind all personnel entering to abide by the safety regulations. At the same time, sufficient fire-fighting equipment should be equipped in the room, and the effectiveness of the fire-fighting equipment should be checked regularly to ensure timely disposal in case of sudden fire.
When maintaining or replacing the battery, the operation process must be strictly standardized. The tools used (such as wrenches, screwdrivers, etc.) must be equipped with insulating sleeves to prevent short circuits and electric shock accidents during operation; operators must wear personal protective equipment to avoid direct contact with the electrolyte and prevent skin corrosion. In addition, no debris, especially flammable, explosive and corrosive items, shall be piled above and around the battery to avoid damage to the battery caused by debris collision or safety hazards.
The charge-discharge status of the battery pack directly affects its performance and service life. Reasonable control of the charge-discharge process and avoidance of abnormal situations such as overcharging and over-discharging are the core contents of maintenance and management.
First of all, it is necessary to strictly avoid overcharging and over-discharging of the battery pack. Overcharging will cause the decomposition of the internal electrolyte of the battery, aging of the plates, accelerate the attenuation of battery capacity, and even cause battery swelling, leakage and other faults; over-discharging will cause plate sulfidation, damage the internal structure of the battery, and make the battery unable to be recharged and recovered. In practice, a BMS (Battery Management System) can be installed to real-time monitor the voltage, temperature and current of each battery cell. Once an abnormality is detected, the charge-discharge circuit is immediately cut off to prevent the spread of faults. At the same time, the state of charge (SOC) of the battery should be controlled within a safe range. Generally, the discharge depth of lead-acid batteries does not exceed 80%, that of lithium batteries does not exceed 90%, and the floating charge voltage error is controlled within ±3%.
Secondly, it is necessary to carry out balanced charging regularly. Due to the slight differences between the individual cells in the battery pack, voltage imbalance is likely to occur after long-term charge and discharge, which will affect the performance and service life of the entire battery pack. Therefore, it is generally necessary to perform 2~3 times of balanced charging on the battery pack every quarter. A current higher than the floating charge voltage can be used for charging for about 8 hours to eliminate the voltage difference between individual cells and avoid the "barrel effect". For batteries with mild sulfidation, a 0.1C current can be used for balanced charging to activate the active substances of the plates and restore the battery performance.
In addition, the operation strategy should be adjusted according to the weather and operation conditions. If there are consecutive rainy days and the power generation of photovoltaic modules is insufficient, resulting in insufficient battery charging, the power supply time to the load should be stopped or shortened in a timely manner to avoid battery damage due to over-discharging; for batteries that have been out of service for more than 3 months, supplementary charging should be performed first, and then put into operation after the battery state is restored to prevent performance degradation caused by long-term idleness of the battery.
During daily maintenance, it is necessary to closely monitor the operating status of the battery pack. Once an abnormality is found, it should be handled in a timely manner and the cause should be found to avoid the expansion of the fault. If corrosion, leakage, depression or swelling is found on the surface of the battery, the operation of the battery should be stopped immediately, the cause of the leakage (such as shell damage, poor sealing, etc.) should be investigated, the damaged battery should be properly handled, and the surrounding batteries should be checked for impact; if the connecting screws between the battery cells are found to be loose, they should be tightened in a timely manner to prevent heating, sparking and other faults caused by poor contact; if abnormal voltage of individual cells in the battery pack is detected, the cause should be investigated in a timely manner, and individual replacement should be performed if necessary.
When replacing the battery, the principle of "same brand and same model" must be strictly followed to ensure that the replaced battery is consistent with the original battery in terms of voltage, capacity, charge-discharge characteristics and external dimensions, so as to avoid the performance degradation and service life shortening of the entire battery pack due to differences in battery parameters. The replacement process must be carried out in strict accordance with the operation specifications, disconnect the relevant power supply, do a good job in insulation protection to avoid short circuit of positive and negative electrodes. After the replacement is completed, charge-discharge test should be carried out to confirm that the battery pack is operating normally before resuming normal operation. At the same time, the replaced waste batteries should be properly disposed of in accordance with environmental protection requirements to avoid environmental pollution.
The maintenance and management of battery packs in photovoltaic power stations is a systematic and long-term work. It is necessary to establish a "prevention first, combination of prevention and control" maintenance system combined with various factors such as environmental conditions, installation specifications and operating status. By implementing standardized measures such as environmental control, daily inspection, safety management, charge-discharge control and fault handling, the failure rate of the battery pack can be effectively reduced, its service life can be extended, and the stable and efficient operation of the energy storage system of the photovoltaic power station can be guaranteed. At the same time, operation and maintenance personnel need to continuously improve their professional skills, be familiar with the operating characteristics and maintenance specifications of the battery, and optimize the maintenance strategy according to the actual operation situation to ensure that the battery pack can give full play to its energy storage efficiency and provide a reliable guarantee for the sustainable operation of the photovoltaic power station. In the future, with the continuous development of photovoltaic energy storage technology, intelligent monitoring systems can be combined to realize real-time monitoring and precise maintenance of the operating status of battery packs, further improving the efficiency and level of maintenance and management.
