On-line detection system and detection method of lead-acid storage battery performance

Abstract

The invention discloses an on-line detection system and a detection method of a lead-acid storage battery performance. The on-line detection system and the detection method are used for performing on-line detection of performance indexes of a lead-acid storage battery to be detected. A digital signal processor (DSP) control module is connected with a test power supply through a power supply drive circuit and a voltage control circuit respectively, the DSP control module is connected with an upper computer processing unit, a complex programmable logic device (CPLD) acquisition module is connected with the lead-acid storage battery to be detected through an analog / digital (A / D) switching circuit and a signal conditioning circuit, the test power supply is in a serial connection with a test internal resistor and a timing switch to be added to two ends of a standardized test inductor to form an impact voltage generator, the standardized test inductor is in the serial connection with a compensation voltage to be connected with the two ends of the lead-acid storage battery to be detected, a damping exponent, an oscillation frequency, a waveform area and a resistance value of a damping oscillation waveform are utilized as an input layer neuron of a batch processing (BP) neural network, a state of charge (SOC), surplus capacity and a capacitance are utilized as an output layer neuron to obtain three values of output quantity; and during the detection process, a large current charge-discharge of the lead-acid storage battery is prevented, and the lead-acid storage battery is free of losses.

Description

technical field [0001] The invention relates to a storage battery performance detection technology, in particular to an online detection method for the performance index of a lead-acid storage battery to be tested. Background technique [0002] Lead-acid batteries are widely used in many fields such as automobiles, communications, and traction. Although lead-acid batteries have low energy and short deep cycle life compared with technologically advanced lithium batteries and nickel-metal hydride batteries, due to their power characteristics Good, small self-discharge, superior high and low temperature performance, mature production and recycling technology, and low cost advantages are still the mainstream products of secondary batteries. However, the development of corresponding lead-acid battery detection technology is relatively sluggish. The existing lead-acid battery detection methods include voltage measurement method, check discharge method, on-line rapid capacity test ...

AI Technical Summary

Problems solved by technology

[0004] (2) Traditional check discharge equipment generally uses resistance wire or water resistance for check discharge, and it is manually operated, with cumbersome procedures and certain personal dangers. This traditional check discharge test method is gradually being eliminated

The check discharge method has the advantages of accurate and reliable capacity test, but the disadvantages are: ① check discharge time is long, the risk is high, the battery pack must be separated from the system, and the chemical energy stored in the lead-acid battery pack is consumed in the form of heat energy, which wastes electric energy and It is time-consuming and labor-intensive, and increases the risk of system power failure; ② To conduct a check discharge test, certain conditions must be met. First, it must be carried out under the condition of basic guarantee of mains power; A computer room with a main and a backup battery pack structure

③At present, the check discharge can only test the capacity of the whole battery group, not the capacity of each single battery. The battery with the lowest capacity is used as the capacity of the whole group, while the other parts of the battery are not degraded or backward due to insufficient discharge depth. fully exposed

④Frequent deep discharge of lead-acid batteries will produce lead sulfate precipitation, resulting in sulfation of the plates, decreased capacity, and backward batteries. Therefore, frequent deep discharges of lead-acid batteries are not suitable

Therefore, checking discharge can only be used for regular maintenance of lead-acid batteries, which cannot meet the needs of daily maintenance.

[0005] (3) Online rapid capacity test method (battery inspection method), simple operation, low risk factor, and can quickly find outdated batteries, but the test accuracy is low, it can only be used as a basis for judging the backward state of the battery, and cannot accurately measure the quality of the battery Level and battery capacity indicators

At the same time, the test requirements are relatively high. If a certain test accuracy is to be achieved, the test environment should generally meet a series of conditions including discharge factors, but the actual conditions of the test environment are different, and most of them cannot meet the corresponding test requirements.

[0006] (4) The conductivity method can accurately detect completely failed batteries. According to the battery conductance value or internal resistance value, the performance of the battery can be determined to a certain extent, but it is not enough to accurately measure the quality of the battery. Actual performance metrics, especially capacity metrics

However, due to the high risk, long time and heavy workload, it is not suitable as a test instrument for daily inspection, but only as a battery pack for annual or triennial check discharge test.

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