Method and special device for comprehensive control of storage battery pack

Abstract

The invention relates to a method and a special device for the comprehensive control of a storage battery pack, which is characterized in that: storage batteries are discharged or charged by measuring the surface temperature of each storage battery of the storage battery pack and the terminal voltage of each storage battery of the storage battery pack; and a storage battery open circuit alarming signal or a storage battery pack overvoltage alarming signal is output by measuring the floating charge current of the storage battery pack. The special device consists of a main machine (1) and a plurality of monitoring and controlling units (11) with the same structure, wherein the main machine (1) comprises a main control circuit (10), a floating charge current measuring circuit (2), a bus voltage measuring circuit (3), a charge module circuit (4), a discharge module circuit (5), a liquid display (7) and a keyboard input circuit (8). The monitoring and controlling units (11) are parallelly connected; and the output ends of the charge module circuit (4) and the discharge module circuit (5) are connected with the charge control input end and the discharge control input end of charge and discharge control circuits (13) in the monitoring and controlling units (11) respectively. The method and the device are widely used for detecting the storage batteries for power plants, transformer substations, telecommunication and the like.

Description

technical field [0001] The invention relates to a comprehensive measurement and control method for a battery pack and a special device thereof, which are suitable for fault detection of a battery pack in a DC system. The utility model belongs to the technical field of detection equipment of a direct current system. Background technique [0002] As an important part of the DC power supply, the battery pack has been widely used in power, communication and other systems. At present, most domestic substations with a voltage level of 110kV and above use battery packs as backup power for DC power. According to incomplete statistics, there are at least hundreds of thousands of DC system battery packs running online nationwide. [0003] At present, the daily maintenance of lead-acid valve-regulated batteries used in large quantities mainly has the following methods: [0004] 1. Regular discharge of nuclear capacity [0005] The main maintenance method for the battery is to disch...

AI Technical Summary

Problems solved by technology

[0007] This method has been applied to the battery terminal voltage online test equipment to monitor the battery terminal voltage in real time, but this method has the following disadvantages: on the one hand, because the product performance parameters are not uniform, after a period of operation, the measured value of the battery terminal voltage has a large deviation, which is fundamental It cannot be used as a reference; on the other hand, because some online detection equipment has too much working current, which consumes most of the floating charging current of the battery, so that the battery cannot be supplemented by the floating charging current.

However, this method requires a switch to be connected to the battery circuit, which increases the unreliability of the battery power supply; in addition, the battery must be disconnected frequently, which violates the management regulations that the DC system cannot be disconnected from the battery operation, and instead increases the risk of system operation!

[0014] In general, the existing repair and maintenance methods for storage batteries are not only time-consuming and laborious, but also have limited practical effects. Moreover, the detection method after the event, that is, the faulty battery can only be detected after the battery has a problem, and the backward battery cannot be found in advance. prevent battery deterioration

[0015] It should be noted that due to the difference in the manufacturing process, it is difficult for the long-term running battery to have the same characteristics as self-discharge. However, the current charger is to supplement the battery pack as a whole, usually after three months of equal charging. , long-term operation in the floating charge state, this charging mode will definitely cause some batteries to be overcharged, while some batteries will be undercharged

As we all know, long-term overcharging and undercharging of the battery will have a great impact on the capacity of the battery, greatly reducing the capacity and service life of the battery, which is one of the main reasons why the battery cannot meet the standard service life of the manufacturer

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