CN107728079B - Quick detecting system of photovoltaic energy storage battery - Google Patents

Quick detecting system of photovoltaic energy storage battery Download PDF

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Publication number
CN107728079B
CN107728079B CN201711212833.4A CN201711212833A CN107728079B CN 107728079 B CN107728079 B CN 107728079B CN 201711212833 A CN201711212833 A CN 201711212833A CN 107728079 B CN107728079 B CN 107728079B
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China
Prior art keywords
storage battery
energy storage
circuit
detection circuit
voltage
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CN201711212833.4A
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CN107728079A (en
Inventor
措加旺姆
努桑
周易
胡贵军
晋亚铭
赵地
段杰
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Tibet University
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Tibet University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389Measuring internal impedance, internal conductance or related variables

Abstract

The invention discloses a photovoltaic energy storage battery rapid detection system, which comprises a microcomputer device and a signal acquisition circuit, wherein the signal acquisition circuit comprises a voltage detection circuit and an internal resistance detection circuit, and a singlechip in the microcomputer device is electrically connected with the voltage detection circuit and the internal resistance detection circuit and transmits collected information to a computer in the microcomputer device. The rapid detection system for the photovoltaic energy storage battery can detect the failure of the photovoltaic energy storage battery, judge whether the battery fails or not, strictly judge and quantitatively analyze the repairable type failure and the non-repairable type failure, and provide a repair basis for repairing the energy storage battery. The working personnel can timely carry out fault removal aiming at different failure types of the battery, so that the normal energy storage and operation of the whole photovoltaic energy storage battery are ensured.

Description

Quick detecting system of photovoltaic energy storage battery
Technical Field
The invention relates to the technical field of battery detection, in particular to a photovoltaic energy storage battery rapid detection system.
Background
Development and utilization of new energy are receiving wide attention increasingly, and especially photovoltaic power generation is rapidly developed. The energy storage batteries adopted by photovoltaic power generation mostly mainly comprise lead-acid storage batteries, the management of the storage batteries is too simple, most of the energy storage batteries are judged by adopting perceptual knowledge for quick detection and evaluation of a photovoltaic energy storage system, the repairable failure and the irreparable failure of the stored energy are not strictly judged and quantitatively analyzed, and the cost of the energy storage system is increased invisibly.
Disclosure of Invention
The invention aims to provide a photovoltaic energy storage battery rapid detection system, which is used for solving the problems in the prior art, can strictly judge and quantitatively analyze the repairable failure and the non-repairable failure of an energy storage battery while rapidly detecting the photovoltaic energy storage system, and provides a repair basis for repairing the energy storage battery.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a photovoltaic energy storage battery rapid detection system which comprises a microcomputer device and a signal acquisition circuit, wherein the signal acquisition circuit comprises a voltage detection circuit and an internal resistance detection circuit, and a single chip microcomputer in the microcomputer device is electrically connected with the voltage detection circuit and the internal resistance detection circuit and transmits collected information to a computer in the microcomputer device.
Optionally, the internal resistance detection circuit adopts a battery internal resistance measuring instrument.
Optionally, the voltage detection circuit adopts a differential amplification circuit, and the differential amplification circuit includes an operational amplifier and four resistors.
Optionally, the detection system further includes a voltage follower, and the voltage follower is connected to the differential amplification circuit.
Optionally, the voltage follower is further connected to a limiting circuit.
Optionally, the signal acquisition circuit further comprises a current detection circuit, the current detection circuit adopts a hall current sensor, and a voltage signal output by the hall current sensor enters the voltage follower and is finally connected with the single chip microcomputer through a conversion circuit.
Optionally, the signal acquisition circuit further comprises a temperature detection circuit, the temperature detection circuit adopts a digital temperature sensor, and the temperature detection circuit is in signal connection with the single chip microcomputer.
Optionally, the detection system further includes a single on-load detection circuit, and the on-load detection circuit includes a multimeter and an on-load electrical appliance.
Compared with the prior art, the invention has the following technical effects:
the rapid detection system for the photovoltaic energy storage battery can detect the failure of the photovoltaic energy storage battery, judge whether the battery fails or not, strictly judge and quantitatively analyze the repairable type failure and the non-repairable type failure, and provide a repair basis for repairing the energy storage battery. The working personnel can timely carry out fault removal aiming at different failure types of the battery, so that the normal energy storage and operation of the whole photovoltaic energy storage battery are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a processing flow chart of the photovoltaic energy storage cell rapid detection system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a photovoltaic energy storage battery rapid detection system, which is used for solving the problems in the prior art, can strictly judge and quantitatively analyze the repairable failure and the non-repairable failure of an energy storage battery while rapidly detecting the photovoltaic energy storage system, and provides a repair basis for repairing the energy storage battery.
The invention provides a photovoltaic energy storage battery rapid detection system, which comprises a microcomputer device and a signal acquisition circuit, wherein the signal acquisition circuit comprises a voltage detection circuit and an internal resistance detection circuit, and a singlechip in the microcomputer device is electrically connected with the voltage detection circuit and the internal resistance detection circuit and transmits collected information to a computer in the microcomputer device.
The energy storage battery is detected through a voltage detection circuit and an internal resistance detection circuit in the signal acquisition circuit, whether the voltage and the internal resistance of the energy storage battery are in a failure state or not is judged, the failure degree of the battery is judged according to the displayed voltage value and the displayed internal resistance value, and therefore information is fed back to a computer through a single chip microcomputer to facilitate monitoring and judgment processing of workers.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a process flow diagram of a rapid detection system for a photovoltaic energy storage cell according to the present invention.
The failure modes of the photovoltaic energy storage battery are various, the invention takes a common energy storage lead storage battery as a research opposite direction, and the failure modes of the lead storage battery mainly comprise the conditions of water loss, sulfation, pole plate softening, grid corrosion, short circuit, open circuit, thermal runaway, no antimony effect, expansion and damage of appearance, battery service life after normal use and the like. Some cases are repairable and some are not. The invention carries out detection and analysis aiming at the realization condition of the concentrated battery, can find the failure reason of the battery in time and take corresponding countermeasures, repairs and uses the repairable battery in time, and replaces the irreparable battery in time without influencing the normal work of the whole group of energy storage batteries.
According to the photovoltaic energy storage battery rapid detection system, the signal acquisition circuit comprises a voltage detection circuit, an internal resistance detection circuit and a temperature detection circuit, and the failure degree of the battery is detected by the arrangement of the circuits and the combination of the requirements in the battery detection process.
Firstly, the voltage of two ends of the energy storage battery is detected by a voltage detection circuit, and a differential amplification circuit is a circuit which amplifies the difference value of signals applied to two input ends and outputs the amplified difference value. The basic differential amplifying circuit is composed of an operational amplifier and four resistors, the first stage of the circuit is a differential amplifying circuit, the second stage of the circuit is a voltage follower, an amplitude limiting circuit is arranged before output in order to prevent surge voltage from damaging an A/D port of the single chip microcomputer, and voltage detection on the energy storage battery can be realized by selecting a proper resistor according to the requirement of the single chip microcomputer on voltage collection. And detecting whether the voltage of the energy storage battery reaches a failure voltage or not through a voltage detection circuit.
And then, carrying out internal resistance detection on the energy storage battery which is subjected to the detection of the overvoltage detection circuit and the detected voltage reaches the failure voltage.
The failure of the valve-regulated sealed secondary battery, such as grid corrosion and growth, poor contact, reduction of the available amount of active materials, and the like, is concentrated on the increase of the resistance and the reduction of the conductance of the battery, and therefore, the level of the resistance or the conductance can provide effective information reflecting the failure and the use degree of the battery.
The measuring mode of the battery internal resistance measuring instrument is that an alternating current generating device injects a low-frequency 20-30 Hz or 60 Hz alternating current signal into a battery monomer or a battery pack, alternating current passing through the battery and alternating voltage at two ends of each battery are measured, and then the I/U or Vac/lac ratio is calculated, so that the conductance or resistance value of the battery is obtained, and the value is displayed. The instrument for measuring the internal resistance of the battery is to inject an alternating current signal into the storage battery to measure the alternating voltage at two ends of the battery and the current passing through the battery. If there is a certain amount of ripple voltage on the battery pack, in many cases, offline testing or measures to eliminate the ripple must be taken.
And detecting the internal resistance of the energy storage battery through the internal resistance detection circuit, and judging whether the resistance of the energy storage battery reaches an invalid value.
When the detected voltage and resistance of the energy storage battery are invalid values, further judging the failure reason of the energy storage battery, and judging whether the failure reason is repairable failure or non-repairable failure.
Determination of short circuit of energy storage battery
The energy storage battery is formed by connecting a plurality of storage batteries in series, and the short circuit fault of the energy storage battery means that the positive electrode and the negative electrode in a single battery are in short circuit. Between the positive and negative plates which are mutually crossed and superposed, the potential difference can be generated in the electrolyte to form the positive and negative electrodes of the electrochemical reaction under the normal condition that the state of no current is maintained. The volume of the storage battery is reduced during manufacturing, the anti-vibration capability of the storage battery in the motion process is improved, and positive and negative plates in the shell need to be kept in a compressed state. When the surface of the polar plate is uneven during manufacturing, raised lumps exist, or a large sharp conductive substance is clamped during assembly, so that the insulating separator bears a large extrusion force. Under the dual effects of vibration and prolonging the service life, a certain point of a positive plate and a negative plate inside the storage battery is directly connected (equivalent to the short circuit of the positive plate and the negative plate outside the storage battery), so that the positive plate and the negative plate which are connected in parallel generate electrochemical discharge reaction, finally become lead sulfate, and cannot be reduced during charging.
According to the state of the storage battery, when the terminal voltage value of one storage battery is always smaller than that of other storage batteries by 2V and multiple, the short-circuit fault of one storage battery can be confirmed.
Other reasons for causing single failure of the storage battery are that the plate is bent and deformed due to large charging and discharging current to damage and short circuit the separator (the plate is bent and deformed due to large charging and discharging current, the active material is expanded and falls off to accumulate short circuit, or the plate is poor in manufacturing quality, the active material falls off early to accumulate short circuit), and conductive material falls into the storage battery to short circuit the storage battery.
The method for confirming the fault cell comprises the following steps: the voltage values of the pole pile terminal and the busbar in the liquid injection port are measured by a voltmeter by utilizing the pole pile terminal and the liquid injection port outside the storage battery, and then the fault unit can be found out. In operation, care is taken to distinguish whether the positive bus bar or the negative bus bar is in contact. PbO is generally present on the surface of the positive electrode bus bar2The contact pin is easy to have poor contact during measurement. The surface of the negative electrode bus bar is Pb, and the contact pin contact measurement work is relatively easy. Therefore, the pole post terminal and the negative electrode bus bar outside the battery are selected as much as possible.
For the case that the conductive substance is determined to fall into the storage battery, the storage battery can be inverted, and the conductive substance can be poured out from the liquid injection port. For the storage battery with the short-circuit fault accumulated by early falling of the active substance, although the storage battery can be removed by a method of filling electrolyte to flush and eliminate the precipitate, the repair significance is not great because the capacity of the single-cell battery is reduced after the falling of the active substance and the performance parameters of each monomer are inconsistent.
Judgment of open circuit (open circuit) failure of energy storage battery
The open circuit fault in the energy storage battery refers to the disconnection of an original current-conducting loop, so that normal active substances participate in the electrochemical reaction of charging and discharging, and the current cannot pass through.
The terminal voltage of the single battery under load was checked with a bulb and multimeter. If no voltage exists during loading, the internal open circuit of the storage battery is judged. If open circuit fault occurs at the busbar and the pole terminal of the storage battery, repair treatment can be carried out. Whether the open circuit appears at the resin encapsulation part of the pole terminal is checked firstly, and the pole is replaced or the lead is welded again by digging out the epoxy resin on the surface of the open circuit part, so that the performance of the storage battery is recovered. If it is confirmed that the open failure is caused by bus bar cross welding, wall penetration welding, or the like inside the battery, the battery must be replaced.
Judgment of plate sulfation
Sulfation failure is characterized by a decrease in active species on the plate, a high resistance, and a decrease in the relative density of the electrolyte. By checking the terminal voltage of the fully charged storage battery, it is possible to detect whether the energy storage battery is sulphated. If the terminal voltage of the energy storage battery after being fully charged is obviously reduced, the fact that the electrode plate is sulfated in the storage battery can be judged.
Once the accumulator is sulphated, the situation is not so severe and it can be repaired by water therapy attempts.
Thermal runaway determination
In the charging process, recombination reaction in the battery generates a large amount of heat energy, and the heat is not easy to dissipate due to the sealing structure of the storage battery, so that the temperature rise of the battery is too high and the battery fails.
Through the digital temperature sensor in the temperature detection circuit, in order to reduce interference, the connection adopts a twisted pair, and the temperature quantity is transmitted back to the singlechip for judgment and further display through the access to the single bus.
It should be noted that, for different failure types of the energy storage battery, a targeted detection device may be adopted, which is not described in detail in the embodiments of the present invention, and any judgment means that is easily conceivable for the failure phenomenon in the art is included in the present invention, and therefore, is also within the protection scope of the present invention; in addition, the selection of specific measuring instruments in the voltage detection circuit, the internal resistance detection circuit and the temperature detection circuit can also be replaced according to actual requirements, and the selection also falls into the protection scope of the invention as long as the corresponding detection requirements can be met.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (6)

1. The utility model provides a quick detecting system of photovoltaic energy storage battery which characterized in that: the system comprises a microcomputer device and a signal acquisition circuit, wherein the signal acquisition circuit comprises a voltage detection circuit and an internal resistance detection circuit, and a single chip microcomputer in the microcomputer device is electrically connected with the voltage detection circuit and the internal resistance detection circuit and transmits collected information to a computer in the microcomputer device; the internal resistance detection circuit adopts a battery internal resistance measuring instrument, the voltage detection circuit adopts a differential amplification circuit, and the differential amplification circuit comprises an operational amplifier and four resistors;
when the detected voltage and resistance of the energy storage battery are invalid values, further judging the failure reason, wherein the failure reason judging mode comprises the judgment of energy storage battery short circuit, the judgment of energy storage battery open circuit failure, the judgment of plate sulfation and the judgment of thermal runaway;
in the judgment of the short circuit of the energy storage battery, when the terminal voltage value of the storage battery is smaller than that of other storage batteries by 2V and multiples thereof, the short circuit fault of a single battery in the storage battery can be confirmed, and the voltage values of the pole pile terminal and a busbar in a liquid injection port are measured by a voltmeter by utilizing the pole pile terminal and the liquid injection port outside the storage battery, so that a fault single lattice can be found out;
in the judgment of the open circuit failure of the energy storage battery, a bulb and a universal meter are used for checking the terminal voltage of a single storage battery when the single storage battery is loaded, and if no voltage exists when the single storage battery is loaded, the internal open circuit of the storage battery is judged;
in the judgment of the pole plate sulfation, whether the energy storage battery is sulfated or not can be determined by checking the terminal voltage of the fully charged storage battery, and if the terminal voltage of the fully charged energy storage battery is obviously reduced, the pole plate sulfation generated in the storage battery can be judged;
in the thermal runaway judgment, a digital temperature sensor in the temperature detection circuit transmits the temperature back to the singlechip for judgment and further display.
2. The photovoltaic energy storage cell rapid detection system according to claim 1, characterized in that: the detection system also comprises a voltage follower, and the voltage follower is connected with the differential amplification circuit.
3. The photovoltaic energy storage cell rapid detection system according to claim 2, characterized in that: the voltage follower is also connected with a limiting circuit.
4. The photovoltaic energy storage cell rapid detection system according to claim 3, characterized in that: the signal acquisition circuit also comprises a current detection circuit, the current detection circuit adopts a Hall current sensor, and a voltage signal output by the Hall current sensor enters the voltage follower and is finally connected with the singlechip through a conversion circuit.
5. The photovoltaic energy storage cell rapid detection system according to claim 1, characterized in that: the signal acquisition circuit further comprises a temperature detection circuit, the temperature detection circuit adopts a digital temperature sensor, and the temperature detection circuit is in signal connection with the single chip microcomputer.
6. The photovoltaic energy storage cell rapid detection system according to claim 1, characterized in that: the detection system also comprises a single on-load detection circuit, and the on-load detection circuit comprises a multimeter and an on-load electric appliance.
CN201711212833.4A 2017-11-28 2017-11-28 Quick detecting system of photovoltaic energy storage battery Expired - Fee Related CN107728079B (en)

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CN111856284A (en) * 2020-06-11 2020-10-30 国网江苏省电力有限公司电力科学研究院 Failure analysis method and device for energy storage power station battery

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CN203376458U (en) * 2013-07-19 2014-01-01 孟州卓伦光电科技有限公司 Off-grid photovoltaic power station storage battery monitoring system
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CN107390130A (en) * 2017-07-14 2017-11-24 王亚鲁 Ring main unit battery on-Line Monitor Device and monitoring method

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Publication number Priority date Publication date Assignee Title
CN201765311U (en) * 2010-03-29 2011-03-16 深圳睿立方智能科技有限公司 Battery monitoring device
CN203376458U (en) * 2013-07-19 2014-01-01 孟州卓伦光电科技有限公司 Off-grid photovoltaic power station storage battery monitoring system
CN204559517U (en) * 2015-04-27 2015-08-12 北京电子科技职业学院 A kind of based on monolithic processor controlled photovoltaic cell checkout gear
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